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-rw-r--r--kernel/Kconfig.freezer2
-rw-r--r--kernel/Makefile3
-rw-r--r--kernel/acct.c2
-rw-r--r--kernel/auditsc.c9
-rw-r--r--kernel/cgroup.c269
-rw-r--r--kernel/cgroup_debug.c4
-rw-r--r--kernel/cgroup_freezer.c379
-rw-r--r--kernel/compat.c111
-rw-r--r--kernel/configs.c9
-rw-r--r--kernel/cpu.c24
-rw-r--r--kernel/cpuset.c19
-rw-r--r--kernel/dma-coherent.c2
-rw-r--r--kernel/dma.c2
-rw-r--r--kernel/exit.c38
-rw-r--r--kernel/fork.c100
-rw-r--r--kernel/freezer.c154
-rw-r--r--kernel/hrtimer.c15
-rw-r--r--kernel/irq/autoprobe.c43
-rw-r--r--kernel/irq/chip.c101
-rw-r--r--kernel/irq/handle.c27
-rw-r--r--kernel/irq/internals.h7
-rw-r--r--kernel/irq/manage.c130
-rw-r--r--kernel/irq/migration.c14
-rw-r--r--kernel/irq/proc.c45
-rw-r--r--kernel/irq/resend.c6
-rw-r--r--kernel/irq/spurious.c162
-rw-r--r--kernel/itimer.c33
-rw-r--r--kernel/kallsyms.c1
-rw-r--r--kernel/kexec.c3
-rw-r--r--kernel/kmod.c67
-rw-r--r--kernel/kprobes.c2
-rw-r--r--kernel/ksysfs.c35
-rw-r--r--kernel/kthread.c10
-rw-r--r--kernel/marker.c36
-rw-r--r--kernel/module.c137
-rw-r--r--kernel/notifier.c2
-rw-r--r--kernel/panic.c67
-rw-r--r--kernel/posix-cpu-timers.c512
-rw-r--r--kernel/posix-timers.c153
-rw-r--r--kernel/power/disk.c11
-rw-r--r--kernel/power/main.c7
-rw-r--r--kernel/power/process.c119
-rw-r--r--kernel/power/user.c10
-rw-r--r--kernel/printk.c42
-rw-r--r--kernel/profile.c41
-rw-r--r--kernel/ptrace.c2
-rw-r--r--kernel/rcuclassic.c337
-rw-r--r--kernel/rcupreempt.c10
-rw-r--r--kernel/rcupreempt_trace.c7
-rw-r--r--kernel/rcutorture.c2
-rw-r--r--kernel/resource.c150
-rw-r--r--kernel/sched.c413
-rw-r--r--kernel/sched_clock.c6
-rw-r--r--kernel/sched_debug.c2
-rw-r--r--kernel/sched_fair.c235
-rw-r--r--kernel/sched_features.h1
-rw-r--r--kernel/sched_idletask.c6
-rw-r--r--kernel/sched_rt.c61
-rw-r--r--kernel/sched_stats.h86
-rw-r--r--kernel/signal.c11
-rw-r--r--kernel/softirq.c152
-rw-r--r--kernel/softlockup.c2
-rw-r--r--kernel/sys.c113
-rw-r--r--kernel/sys_ni.c6
-rw-r--r--kernel/sysctl.c133
-rw-r--r--kernel/time/Kconfig1
-rw-r--r--kernel/time/clocksource.c3
-rw-r--r--kernel/time/jiffies.c1
-rw-r--r--kernel/time/ntp.c93
-rw-r--r--kernel/time/tick-broadcast.c13
-rw-r--r--kernel/time/tick-internal.h2
-rw-r--r--kernel/time/tick-sched.c106
-rw-r--r--kernel/time/timekeeping.c122
-rw-r--r--kernel/time/timer_list.c20
-rw-r--r--kernel/timer.c12
-rw-r--r--kernel/trace/Kconfig64
-rw-r--r--kernel/trace/Makefile4
-rw-r--r--kernel/trace/ftrace.c275
-rw-r--r--kernel/trace/ring_buffer.c2014
-rw-r--r--kernel/trace/trace.c1845
-rw-r--r--kernel/trace/trace.h211
-rw-r--r--kernel/trace/trace_boot.c126
-rw-r--r--kernel/trace/trace_functions.c2
-rw-r--r--kernel/trace/trace_irqsoff.c19
-rw-r--r--kernel/trace/trace_mmiotrace.c116
-rw-r--r--kernel/trace/trace_nop.c64
-rw-r--r--kernel/trace/trace_sched_switch.c137
-rw-r--r--kernel/trace/trace_sched_wakeup.c148
-rw-r--r--kernel/trace/trace_selftest.c83
-rw-r--r--kernel/trace/trace_stack.c310
-rw-r--r--kernel/trace/trace_sysprof.c2
-rw-r--r--kernel/tracepoint.c477
-rw-r--r--kernel/user.c4
-rw-r--r--kernel/utsname_sysctl.c5
-rw-r--r--kernel/wait.c14
-rw-r--r--kernel/workqueue.c2
96 files changed, 7842 insertions, 3153 deletions
diff --git a/kernel/Kconfig.freezer b/kernel/Kconfig.freezer
new file mode 100644
index 00000000000..a3bb4cb5253
--- /dev/null
+++ b/kernel/Kconfig.freezer
@@ -0,0 +1,2 @@
+config FREEZER
+ def_bool PM_SLEEP || CGROUP_FREEZER
diff --git a/kernel/Makefile b/kernel/Makefile
index 4e1d7df7c3e..305f11dbef2 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -24,6 +24,7 @@ CFLAGS_REMOVE_sched_clock.o = -pg
CFLAGS_REMOVE_sched.o = -mno-spe -pg
endif
+obj-$(CONFIG_FREEZER) += freezer.o
obj-$(CONFIG_PROFILING) += profile.o
obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
@@ -55,6 +56,7 @@ obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
obj-$(CONFIG_COMPAT) += compat.o
obj-$(CONFIG_CGROUPS) += cgroup.o
obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
+obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
obj-$(CONFIG_UTS_NS) += utsname.o
@@ -83,6 +85,7 @@ obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
obj-$(CONFIG_MARKERS) += marker.o
+obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
obj-$(CONFIG_LATENCYTOP) += latencytop.o
obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
obj-$(CONFIG_FTRACE) += trace/
diff --git a/kernel/acct.c b/kernel/acct.c
index dd68b905941..f6006a60df5 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -548,7 +548,7 @@ static void do_acct_process(struct bsd_acct_struct *acct,
#endif
spin_lock_irq(&current->sighand->siglock);
- tty = current->signal->tty;
+ tty = current->signal->tty; /* Safe as we hold the siglock */
ac.ac_tty = tty ? old_encode_dev(tty_devnum(tty)) : 0;
ac.ac_utime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_utime)));
ac.ac_stime = encode_comp_t(jiffies_to_AHZ(cputime_to_jiffies(pacct->ac_stime)));
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 59cedfb040e..cf5bc2f5f9c 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -246,8 +246,8 @@ static int audit_match_perm(struct audit_context *ctx, int mask)
unsigned n;
if (unlikely(!ctx))
return 0;
-
n = ctx->major;
+
switch (audit_classify_syscall(ctx->arch, n)) {
case 0: /* native */
if ((mask & AUDIT_PERM_WRITE) &&
@@ -1204,13 +1204,13 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
(context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
context->return_code);
- mutex_lock(&tty_mutex);
- read_lock(&tasklist_lock);
+ spin_lock_irq(&tsk->sighand->siglock);
if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
tty = tsk->signal->tty->name;
else
tty = "(none)";
- read_unlock(&tasklist_lock);
+ spin_unlock_irq(&tsk->sighand->siglock);
+
audit_log_format(ab,
" a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
" ppid=%d pid=%d auid=%u uid=%u gid=%u"
@@ -1230,7 +1230,6 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->egid, context->sgid, context->fsgid, tty,
tsk->sessionid);
- mutex_unlock(&tty_mutex);
audit_log_task_info(ab, tsk);
if (context->filterkey) {
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index a0123d75ec9..046c1609606 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -241,7 +241,6 @@ static void unlink_css_set(struct css_set *cg)
struct cg_cgroup_link *link;
struct cg_cgroup_link *saved_link;
- write_lock(&css_set_lock);
hlist_del(&cg->hlist);
css_set_count--;
@@ -251,16 +250,25 @@ static void unlink_css_set(struct css_set *cg)
list_del(&link->cgrp_link_list);
kfree(link);
}
-
- write_unlock(&css_set_lock);
}
-static void __release_css_set(struct kref *k, int taskexit)
+static void __put_css_set(struct css_set *cg, int taskexit)
{
int i;
- struct css_set *cg = container_of(k, struct css_set, ref);
-
+ /*
+ * Ensure that the refcount doesn't hit zero while any readers
+ * can see it. Similar to atomic_dec_and_lock(), but for an
+ * rwlock
+ */
+ if (atomic_add_unless(&cg->refcount, -1, 1))
+ return;
+ write_lock(&css_set_lock);
+ if (!atomic_dec_and_test(&cg->refcount)) {
+ write_unlock(&css_set_lock);
+ return;
+ }
unlink_css_set(cg);
+ write_unlock(&css_set_lock);
rcu_read_lock();
for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) {
@@ -276,32 +284,22 @@ static void __release_css_set(struct kref *k, int taskexit)
kfree(cg);
}
-static void release_css_set(struct kref *k)
-{
- __release_css_set(k, 0);
-}
-
-static void release_css_set_taskexit(struct kref *k)
-{
- __release_css_set(k, 1);
-}
-
/*
* refcounted get/put for css_set objects
*/
static inline void get_css_set(struct css_set *cg)
{
- kref_get(&cg->ref);
+ atomic_inc(&cg->refcount);
}
static inline void put_css_set(struct css_set *cg)
{
- kref_put(&cg->ref, release_css_set);
+ __put_css_set(cg, 0);
}
static inline void put_css_set_taskexit(struct css_set *cg)
{
- kref_put(&cg->ref, release_css_set_taskexit);
+ __put_css_set(cg, 1);
}
/*
@@ -427,7 +425,7 @@ static struct css_set *find_css_set(
return NULL;
}
- kref_init(&res->ref);
+ atomic_set(&res->refcount, 1);
INIT_LIST_HEAD(&res->cg_links);
INIT_LIST_HEAD(&res->tasks);
INIT_HLIST_NODE(&res->hlist);
@@ -870,6 +868,14 @@ static struct super_operations cgroup_ops = {
.remount_fs = cgroup_remount,
};
+static void init_cgroup_housekeeping(struct cgroup *cgrp)
+{
+ INIT_LIST_HEAD(&cgrp->sibling);
+ INIT_LIST_HEAD(&cgrp->children);
+ INIT_LIST_HEAD(&cgrp->css_sets);
+ INIT_LIST_HEAD(&cgrp->release_list);
+ init_rwsem(&cgrp->pids_mutex);
+}
static void init_cgroup_root(struct cgroupfs_root *root)
{
struct cgroup *cgrp = &root->top_cgroup;
@@ -878,10 +884,7 @@ static void init_cgroup_root(struct cgroupfs_root *root)
root->number_of_cgroups = 1;
cgrp->root = root;
cgrp->top_cgroup = cgrp;
- INIT_LIST_HEAD(&cgrp->sibling);
- INIT_LIST_HEAD(&cgrp->children);
- INIT_LIST_HEAD(&cgrp->css_sets);
- INIT_LIST_HEAD(&cgrp->release_list);
+ init_cgroup_housekeeping(cgrp);
}
static int cgroup_test_super(struct super_block *sb, void *data)
@@ -1728,7 +1731,7 @@ int cgroup_task_count(const struct cgroup *cgrp)
read_lock(&css_set_lock);
list_for_each_entry(link, &cgrp->css_sets, cgrp_link_list) {
- count += atomic_read(&link->cg->ref.refcount);
+ count += atomic_read(&link->cg->refcount);
}
read_unlock(&css_set_lock);
return count;
@@ -1997,16 +2000,7 @@ int cgroup_scan_tasks(struct cgroup_scanner *scan)
* but we cannot guarantee that the information we produce is correct
* unless we produce it entirely atomically.
*
- * Upon tasks file open(), a struct ctr_struct is allocated, that
- * will have a pointer to an array (also allocated here). The struct
- * ctr_struct * is stored in file->private_data. Its resources will
- * be freed by release() when the file is closed. The array is used
- * to sprintf the PIDs and then used by read().
*/
-struct ctr_struct {
- char *buf;
- int bufsz;
-};
/*
* Load into 'pidarray' up to 'npids' of the tasks using cgroup
@@ -2088,42 +2082,132 @@ static int cmppid(const void *a, const void *b)
return *(pid_t *)a - *(pid_t *)b;
}
+
/*
- * Convert array 'a' of 'npids' pid_t's to a string of newline separated
- * decimal pids in 'buf'. Don't write more than 'sz' chars, but return
- * count 'cnt' of how many chars would be written if buf were large enough.
+ * seq_file methods for the "tasks" file. The seq_file position is the
+ * next pid to display; the seq_file iterator is a pointer to the pid
+ * in the cgroup->tasks_pids array.
*/
-static int pid_array_to_buf(char *buf, int sz, pid_t *a, int npids)
+
+static void *cgroup_tasks_start(struct seq_file *s, loff_t *pos)
{
- int cnt = 0;
- int i;
+ /*
+ * Initially we receive a position value that corresponds to
+ * one more than the last pid shown (or 0 on the first call or
+ * after a seek to the start). Use a binary-search to find the
+ * next pid to display, if any
+ */
+ struct cgroup *cgrp = s->private;
+ int index = 0, pid = *pos;
+ int *iter;
+
+ down_read(&cgrp->pids_mutex);
+ if (pid) {
+ int end = cgrp->pids_length;
+ int i;
+ while (index < end) {
+ int mid = (index + end) / 2;
+ if (cgrp->tasks_pids[mid] == pid) {
+ index = mid;
+ break;
+ } else if (cgrp->tasks_pids[mid] <= pid)
+ index = mid + 1;
+ else
+ end = mid;
+ }
+ }
+ /* If we're off the end of the array, we're done */
+ if (index >= cgrp->pids_length)
+ return NULL;
+ /* Update the abstract position to be the actual pid that we found */
+ iter = cgrp->tasks_pids + index;
+ *pos = *iter;
+ return iter;
+}
+
+static void cgroup_tasks_stop(struct seq_file *s, void *v)
+{
+ struct cgroup *cgrp = s->private;
+ up_read(&cgrp->pids_mutex);
+}
+
+static void *cgroup_tasks_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct cgroup *cgrp = s->private;
+ int *p = v;
+ int *end = cgrp->tasks_pids + cgrp->pids_length;
+
+ /*
+ * Advance to the next pid in the array. If this goes off the
+ * end, we're done
+ */
+ p++;
+ if (p >= end) {
+ return NULL;
+ } else {
+ *pos = *p;
+ return p;
+ }
+}
+
+static int cgroup_tasks_show(struct seq_file *s, void *v)
+{
+ return seq_printf(s, "%d\n", *(int *)v);
+}
+
+static struct seq_operations cgroup_tasks_seq_operations = {
+ .start = cgroup_tasks_start,
+ .stop = cgroup_tasks_stop,
+ .next = cgroup_tasks_next,
+ .show = cgroup_tasks_show,
+};
+
+static void release_cgroup_pid_array(struct cgroup *cgrp)
+{
+ down_write(&cgrp->pids_mutex);
+ BUG_ON(!cgrp->pids_use_count);
+ if (!--cgrp->pids_use_count) {
+ kfree(cgrp->tasks_pids);
+ cgrp->tasks_pids = NULL;
+ cgrp->pids_length = 0;
+ }
+ up_write(&cgrp->pids_mutex);
+}
+
+static int cgroup_tasks_release(struct inode *inode, struct file *file)
+{
+ struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
- for (i = 0; i < npids; i++)
- cnt += snprintf(buf + cnt, max(sz - cnt, 0), "%d\n", a[i]);
- return cnt;
+ if (!(file->f_mode & FMODE_READ))
+ return 0;
+
+ release_cgroup_pid_array(cgrp);
+ return seq_release(inode, file);
}
+static struct file_operations cgroup_tasks_operations = {
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = cgroup_file_write,
+ .release = cgroup_tasks_release,
+};
+
/*
- * Handle an open on 'tasks' file. Prepare a buffer listing the
+ * Handle an open on 'tasks' file. Prepare an array containing the
* process id's of tasks currently attached to the cgroup being opened.
- *
- * Does not require any specific cgroup mutexes, and does not take any.
*/
+
static int cgroup_tasks_open(struct inode *unused, struct file *file)
{
struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
- struct ctr_struct *ctr;
pid_t *pidarray;
int npids;
- char c;
+ int retval;
+ /* Nothing to do for write-only files */
if (!(file->f_mode & FMODE_READ))
return 0;
- ctr = kmalloc(sizeof(*ctr), GFP_KERNEL);
- if (!ctr)
- goto err0;
-
/*
* If cgroup gets more users after we read count, we won't have
* enough space - tough. This race is indistinguishable to the
@@ -2131,57 +2215,31 @@ static int cgroup_tasks_open(struct inode *unused, struct file *file)
* show up until sometime later on.
*/
npids = cgroup_task_count(cgrp);
- if (npids) {
- pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
- if (!pidarray)
- goto err1;
-
- npids = pid_array_load(pidarray, npids, cgrp);
- sort(pidarray, npids, sizeof(pid_t), cmppid, NULL);
-
- /* Call pid_array_to_buf() twice, first just to get bufsz */
- ctr->bufsz = pid_array_to_buf(&c, sizeof(c), pidarray, npids) + 1;
- ctr->buf = kmalloc(ctr->bufsz, GFP_KERNEL);
- if (!ctr->buf)
- goto err2;
- ctr->bufsz = pid_array_to_buf(ctr->buf, ctr->bufsz, pidarray, npids);
-
- kfree(pidarray);
- } else {
- ctr->buf = NULL;
- ctr->bufsz = 0;
- }
- file->private_data = ctr;
- return 0;
-
-err2:
- kfree(pidarray);
-err1:
- kfree(ctr);
-err0:
- return -ENOMEM;
-}
-
-static ssize_t cgroup_tasks_read(struct cgroup *cgrp,
- struct cftype *cft,
- struct file *file, char __user *buf,
- size_t nbytes, loff_t *ppos)
-{
- struct ctr_struct *ctr = file->private_data;
+ pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
+ if (!pidarray)
+ return -ENOMEM;
+ npids = pid_array_load(pidarray, npids, cgrp);
+ sort(pidarray, npids, sizeof(pid_t), cmppid, NULL);
- return simple_read_from_buffer(buf, nbytes, ppos, ctr->buf, ctr->bufsz);
-}
+ /*
+ * Store the array in the cgroup, freeing the old
+ * array if necessary
+ */
+ down_write(&cgrp->pids_mutex);
+ kfree(cgrp->tasks_pids);
+ cgrp->tasks_pids = pidarray;
+ cgrp->pids_length = npids;
+ cgrp->pids_use_count++;
+ up_write(&cgrp->pids_mutex);
-static int cgroup_tasks_release(struct inode *unused_inode,
- struct file *file)
-{
- struct ctr_struct *ctr;
+ file->f_op = &cgroup_tasks_operations;
- if (file->f_mode & FMODE_READ) {
- ctr = file->private_data;
- kfree(ctr->buf);
- kfree(ctr);
+ retval = seq_open(file, &cgroup_tasks_seq_operations);
+ if (retval) {
+ release_cgroup_pid_array(cgrp);
+ return retval;
}
+ ((struct seq_file *)file->private_data)->private = cgrp;
return 0;
}
@@ -2210,7 +2268,6 @@ static struct cftype files[] = {
{
.name = "tasks",
.open = cgroup_tasks_open,
- .read = cgroup_tasks_read,
.write_u64 = cgroup_tasks_write,
.release = cgroup_tasks_release,
.private = FILE_TASKLIST,
@@ -2300,10 +2357,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
mutex_lock(&cgroup_mutex);
- INIT_LIST_HEAD(&cgrp->sibling);
- INIT_LIST_HEAD(&cgrp->children);
- INIT_LIST_HEAD(&cgrp->css_sets);
- INIT_LIST_HEAD(&cgrp->release_list);
+ init_cgroup_housekeeping(cgrp);
cgrp->parent = parent;
cgrp->root = parent->root;
@@ -2495,8 +2549,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
int __init cgroup_init_early(void)
{
int i;
- kref_init(&init_css_set.ref);
- kref_get(&init_css_set.ref);
+ atomic_set(&init_css_set.refcount, 1);
INIT_LIST_HEAD(&init_css_set.cg_links);
INIT_LIST_HEAD(&init_css_set.tasks);
INIT_HLIST_NODE(&init_css_set.hlist);
@@ -2735,6 +2788,8 @@ void cgroup_fork_callbacks(struct task_struct *child)
* Called on every change to mm->owner. mm_init_owner() does not
* invoke this routine, since it assigns the mm->owner the first time
* and does not change it.
+ *
+ * The callbacks are invoked with mmap_sem held in read mode.
*/
void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
{
@@ -2750,7 +2805,7 @@ void cgroup_mm_owner_callbacks(struct task_struct *old, struct task_struct *new)
if (oldcgrp == newcgrp)
continue;
if (ss->mm_owner_changed)
- ss->mm_owner_changed(ss, oldcgrp, newcgrp);
+ ss->mm_owner_changed(ss, oldcgrp, newcgrp, new);
}
}
}
diff --git a/kernel/cgroup_debug.c b/kernel/cgroup_debug.c
index c3dc3aba4c0..daca6209202 100644
--- a/kernel/cgroup_debug.c
+++ b/kernel/cgroup_debug.c
@@ -57,7 +57,7 @@ static u64 current_css_set_refcount_read(struct cgroup *cont,
u64 count;
rcu_read_lock();
- count = atomic_read(&current->cgroups->ref.refcount);
+ count = atomic_read(&current->cgroups->refcount);
rcu_read_unlock();
return count;
}
@@ -90,7 +90,7 @@ static struct cftype files[] = {
{
.name = "releasable",
.read_u64 = releasable_read,
- }
+ },
};
static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
new file mode 100644
index 00000000000..e9505695449
--- /dev/null
+++ b/kernel/cgroup_freezer.c
@@ -0,0 +1,379 @@
+/*
+ * cgroup_freezer.c - control group freezer subsystem
+ *
+ * Copyright IBM Corporation, 2007
+ *
+ * Author : Cedric Le Goater <clg@fr.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/module.h>
+#include <linux/cgroup.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+#include <linux/freezer.h>
+#include <linux/seq_file.h>
+
+enum freezer_state {
+ CGROUP_THAWED = 0,
+ CGROUP_FREEZING,
+ CGROUP_FROZEN,
+};
+
+struct freezer {
+ struct cgroup_subsys_state css;
+ enum freezer_state state;
+ spinlock_t lock; /* protects _writes_ to state */
+};
+
+static inline struct freezer *cgroup_freezer(
+ struct cgroup *cgroup)
+{
+ return container_of(
+ cgroup_subsys_state(cgroup, freezer_subsys_id),
+ struct freezer, css);
+}
+
+static inline struct freezer *task_freezer(struct task_struct *task)
+{
+ return container_of(task_subsys_state(task, freezer_subsys_id),
+ struct freezer, css);
+}
+
+int cgroup_frozen(struct task_struct *task)
+{
+ struct freezer *freezer;
+ enum freezer_state state;
+
+ task_lock(task);
+ freezer = task_freezer(task);
+ state = freezer->state;
+ task_unlock(task);
+
+ return state == CGROUP_FROZEN;
+}
+
+/*
+ * cgroups_write_string() limits the size of freezer state strings to
+ * CGROUP_LOCAL_BUFFER_SIZE
+ */
+static const char *freezer_state_strs[] = {
+ "THAWED",
+ "FREEZING",
+ "FROZEN",
+};
+
+/*
+ * State diagram
+ * Transitions are caused by userspace writes to the freezer.state file.
+ * The values in parenthesis are state labels. The rest are edge labels.
+ *
+ * (THAWED) --FROZEN--> (FREEZING) --FROZEN--> (FROZEN)
+ * ^ ^ | |
+ * | \_______THAWED_______/ |
+ * \__________________________THAWED____________/
+ */
+
+struct cgroup_subsys freezer_subsys;
+
+/* Locks taken and their ordering
+ * ------------------------------
+ * css_set_lock
+ * cgroup_mutex (AKA cgroup_lock)
+ * task->alloc_lock (AKA task_lock)
+ * freezer->lock
+ * task->sighand->siglock
+ *
+ * cgroup code forces css_set_lock to be taken before task->alloc_lock
+ *
+ * freezer_create(), freezer_destroy():
+ * cgroup_mutex [ by cgroup core ]
+ *
+ * can_attach():
+ * cgroup_mutex
+ *
+ * cgroup_frozen():
+ * task->alloc_lock (to get task's cgroup)
+ *
+ * freezer_fork() (preserving fork() performance means can't take cgroup_mutex):
+ * task->alloc_lock (to get task's cgroup)
+ * freezer->lock
+ * sighand->siglock (if the cgroup is freezing)
+ *
+ * freezer_read():
+ * cgroup_mutex
+ * freezer->lock
+ * read_lock css_set_lock (cgroup iterator start)
+ *
+ * freezer_write() (freeze):
+ * cgroup_mutex
+ * freezer->lock
+ * read_lock css_set_lock (cgroup iterator start)
+ * sighand->siglock
+ *
+ * freezer_write() (unfreeze):
+ * cgroup_mutex
+ * freezer->lock
+ * read_lock css_set_lock (cgroup iterator start)
+ * task->alloc_lock (to prevent races with freeze_task())
+ * sighand->siglock
+ */
+static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss,
+ struct cgroup *cgroup)
+{
+ struct freezer *freezer;
+
+ freezer = kzalloc(sizeof(struct freezer), GFP_KERNEL);
+ if (!freezer)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&freezer->lock);
+ freezer->state = CGROUP_THAWED;
+ return &freezer->css;
+}
+
+static void freezer_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cgroup)
+{
+ kfree(cgroup_freezer(cgroup));
+}
+
+/* Task is frozen or will freeze immediately when next it gets woken */
+static bool is_task_frozen_enough(struct task_struct *task)
+{
+ return frozen(task) ||
+ (task_is_stopped_or_traced(task) && freezing(task));
+}
+
+/*
+ * The call to cgroup_lock() in the freezer.state write method prevents
+ * a write to that file racing against an attach, and hence the
+ * can_attach() result will remain valid until the attach completes.
+ */
+static int freezer_can_attach(struct cgroup_subsys *ss,
+ struct cgroup *new_cgroup,
+ struct task_struct *task)
+{
+ struct freezer *freezer;
+ int retval;
+
+ /* Anything frozen can't move or be moved to/from */
+
+ if (is_task_frozen_enough(task))
+ return -EBUSY;
+
+ freezer = cgroup_freezer(new_cgroup);
+ if (freezer->state == CGROUP_FROZEN)
+ return -EBUSY;
+
+ retval = 0;
+ task_lock(task);
+ freezer = task_freezer(task);
+ if (freezer->state == CGROUP_FROZEN)
+ retval = -EBUSY;
+ task_unlock(task);
+ return retval;
+}
+
+static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task)
+{
+ struct freezer *freezer;
+
+ task_lock(task);
+ freezer = task_freezer(task);
+ task_unlock(task);
+
+ BUG_ON(freezer->state == CGROUP_FROZEN);
+ spin_lock_irq(&freezer->lock);
+ /* Locking avoids race with FREEZING -> THAWED transitions. */
+ if (freezer->state == CGROUP_FREEZING)
+ freeze_task(task, true);
+ spin_unlock_irq(&freezer->lock);
+}
+
+/*
+ * caller must hold freezer->lock
+ */
+static void update_freezer_state(struct cgroup *cgroup,
+ struct freezer *freezer)
+{
+ struct cgroup_iter it;
+ struct task_struct *task;
+ unsigned int nfrozen = 0, ntotal = 0;
+
+ cgroup_iter_start(cgroup, &it);
+ while ((task = cgroup_iter_next(cgroup, &it))) {
+ ntotal++;
+ if (is_task_frozen_enough(task))
+ nfrozen++;
+ }
+
+ /*
+ * Transition to FROZEN when no new tasks can be added ensures
+ * that we never exist in the FROZEN state while there are unfrozen
+ * tasks.
+ */
+ if (nfrozen == ntotal)
+ freezer->state = CGROUP_FROZEN;
+ else if (nfrozen > 0)
+ freezer->state = CGROUP_FREEZING;
+ else
+ freezer->state = CGROUP_THAWED;
+ cgroup_iter_end(cgroup, &it);
+}
+
+static int freezer_read(struct cgroup *cgroup, struct cftype *cft,
+ struct seq_file *m)
+{
+ struct freezer *freezer;
+ enum freezer_state state;
+
+ if (!cgroup_lock_live_group(cgroup))
+ return -ENODEV;
+
+ freezer = cgroup_freezer(cgroup);
+ spin_lock_irq(&freezer->lock);
+ state = freezer->state;
+ if (state == CGROUP_FREEZING) {
+ /* We change from FREEZING to FROZEN lazily if the cgroup was
+ * only partially frozen when we exitted write. */
+ update_freezer_state(cgroup, freezer);
+ state = freezer->state;
+ }
+ spin_unlock_irq(&freezer->lock);
+ cgroup_unlock();
+
+ seq_puts(m, freezer_state_strs[state]);
+ seq_putc(m, '\n');
+ return 0;
+}
+
+static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
+{
+ struct cgroup_iter it;
+ struct task_struct *task;
+ unsigned int num_cant_freeze_now = 0;
+
+ freezer->state = CGROUP_FREEZING;
+ cgroup_iter_start(cgroup, &it);
+ while ((task = cgroup_iter_next(cgroup, &it))) {
+ if (!freeze_task(task, true))
+ continue;
+ if (is_task_frozen_enough(task))
+ continue;
+ if (!freezing(task) && !freezer_should_skip(task))
+ num_cant_freeze_now++;
+ }
+ cgroup_iter_end(cgroup, &it);
+
+ return num_cant_freeze_now ? -EBUSY : 0;
+}
+
+static int unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
+{
+ struct cgroup_iter it;
+ struct task_struct *task;
+
+ cgroup_iter_start(cgroup, &it);
+ while ((task = cgroup_iter_next(cgroup, &it))) {
+ int do_wake;
+
+ task_lock(task);
+ do_wake = __thaw_process(task);
+ task_unlock(task);
+ if (do_wake)
+ wake_up_process(task);
+ }
+ cgroup_iter_end(cgroup, &it);
+ freezer->state = CGROUP_THAWED;
+
+ return 0;
+}
+
+static int freezer_change_state(struct cgroup *cgroup,
+ enum freezer_state goal_state)
+{
+ struct freezer *freezer;
+ int retval = 0;
+
+ freezer = cgroup_freezer(cgroup);
+ spin_lock_irq(&freezer->lock);
+ update_freezer_state(cgroup, freezer);
+ if (goal_state == freezer->state)
+ goto out;
+ switch (freezer->state) {
+ case CGROUP_THAWED:
+ retval = try_to_freeze_cgroup(cgroup, freezer);
+ break;
+ case CGROUP_FREEZING:
+ if (goal_state == CGROUP_FROZEN) {
+ /* Userspace is retrying after
+ * "/bin/echo FROZEN > freezer.state" returned -EBUSY */
+ retval = try_to_freeze_cgroup(cgroup, freezer);
+ break;
+ }
+ /* state == FREEZING and goal_state == THAWED, so unfreeze */
+ case CGROUP_FROZEN:
+ retval = unfreeze_cgroup(cgroup, freezer);
+ break;
+ default:
+ break;
+ }
+out:
+ spin_unlock_irq(&freezer->lock);
+
+ return retval;
+}
+
+static int freezer_write(struct cgroup *cgroup,
+ struct cftype *cft,
+ const char *buffer)
+{
+ int retval;
+ enum freezer_state goal_state;
+
+ if (strcmp(buffer, freezer_state_strs[CGROUP_THAWED]) == 0)
+ goal_state = CGROUP_THAWED;
+ else if (strcmp(buffer, freezer_state_strs[CGROUP_FROZEN]) == 0)
+ goal_state = CGROUP_FROZEN;
+ else
+ return -EIO;
+
+ if (!cgroup_lock_live_group(cgroup))
+ return -ENODEV;
+ retval = freezer_change_state(cgroup, goal_state);
+ cgroup_unlock();
+ return retval;
+}
+
+static struct cftype files[] = {
+ {
+ .name = "state",
+ .read_seq_string = freezer_read,
+ .write_string = freezer_write,
+ },
+};
+
+static int freezer_populate(struct cgroup_subsys *ss, struct cgroup *cgroup)
+{
+ return cgroup_add_files(cgroup, ss, files, ARRAY_SIZE(files));
+}
+
+struct cgroup_subsys freezer_subsys = {
+ .name = "freezer",
+ .create = freezer_create,
+ .destroy = freezer_destroy,
+ .populate = freezer_populate,
+ .subsys_id = freezer_subsys_id,
+ .can_attach = freezer_can_attach,
+ .attach = NULL,
+ .fork = freezer_fork,
+ .exit = NULL,
+};
diff --git a/kernel/compat.c b/kernel/compat.c
index 32c254a8ab9..8eafe3eb50d 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -23,9 +23,68 @@
#include <linux/timex.h>
#include <linux/migrate.h>
#include <linux/posix-timers.h>
+#include <linux/times.h>
#include <asm/uaccess.h>
+/*
+ * Note that the native side is already converted to a timespec, because
+ * that's what we want anyway.
+ */
+static int compat_get_timeval(struct timespec *o,
+ struct compat_timeval __user *i)
+{
+ long usec;
+
+ if (get_user(o->tv_sec, &i->tv_sec) ||
+ get_user(usec, &i->tv_usec))
+ return -EFAULT;
+ o->tv_nsec = usec * 1000;
+ return 0;
+}
+
+static int compat_put_timeval(struct compat_timeval __user *o,
+ struct timeval *i)
+{
+ return (put_user(i->tv_sec, &o->tv_sec) ||
+ put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
+}
+
+asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
+ struct timezone __user *tz)
+{
+ if (tv) {
+ struct timeval ktv;
+ do_gettimeofday(&ktv);
+ if (compat_put_timeval(tv, &ktv))
+ return -EFAULT;
+ }
+ if (tz) {
+ if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
+ struct timezone __user *tz)
+{
+ struct timespec kts;
+ struct timezone ktz;
+
+ if (tv) {
+ if (compat_get_timeval(&kts, tv))
+ return -EFAULT;
+ }
+ if (tz) {
+ if (copy_from_user(&ktz, tz, sizeof(ktz)))
+ return -EFAULT;
+ }
+
+ return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
+}
+
int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
{
return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
@@ -150,49 +209,23 @@ asmlinkage long compat_sys_setitimer(int which,
return 0;
}
+static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
+{
+ return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
+}
+
asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
{
- /*
- * In the SMP world we might just be unlucky and have one of
- * the times increment as we use it. Since the value is an
- * atomically safe type this is just fine. Conceptually its
- * as if the syscall took an instant longer to occur.
- */
if (tbuf) {
+ struct tms tms;
struct compat_tms tmp;
- struct task_struct *tsk = current;
- struct task_struct *t;
- cputime_t utime, stime, cutime, cstime;
-
- read_lock(&tasklist_lock);
- utime = tsk->signal->utime;
- stime = tsk->signal->stime;
- t = tsk;
- do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- t = next_thread(t);
- } while (t != tsk);
-
- /*
- * While we have tasklist_lock read-locked, no dying thread
- * can be updating current->signal->[us]time. Instead,
- * we got their counts included in the live thread loop.
- * However, another thread can come in right now and
- * do a wait call that updates current->signal->c[us]time.
- * To make sure we always see that pair updated atomically,
- * we take the siglock around fetching them.
- */
- spin_lock_irq(&tsk->sighand->siglock);
- cutime = tsk->signal->cutime;
- cstime = tsk->signal->cstime;
- spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
-
- tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime));
- tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime));
- tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime));
- tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime));
+
+ do_sys_times(&tms);
+ /* Convert our struct tms to the compat version. */
+ tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
+ tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
+ tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
+ tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
return -EFAULT;
}
diff --git a/kernel/configs.c b/kernel/configs.c
index 4c345210ed8..abaee684ecb 100644
--- a/kernel/configs.c
+++ b/kernel/configs.c
@@ -54,9 +54,6 @@
#ifdef CONFIG_IKCONFIG_PROC
-/**************************************************/
-/* globals and useful constants */
-
static ssize_t
ikconfig_read_current(struct file *file, char __user *buf,
size_t len, loff_t * offset)
@@ -71,9 +68,6 @@ static const struct file_operations ikconfig_file_ops = {
.read = ikconfig_read_current,
};
-/***************************************************/
-/* ikconfig_init: start up everything we need to */
-
static int __init ikconfig_init(void)
{
struct proc_dir_entry *entry;
@@ -89,9 +83,6 @@ static int __init ikconfig_init(void)
return 0;
}
-/***************************************************/
-/* ikconfig_cleanup: clean up our mess */
-
static void __exit ikconfig_cleanup(void)
{
remove_proc_entry("config.gz", NULL);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index f17e9854c24..86d49045dae 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -199,13 +199,14 @@ static int __ref take_cpu_down(void *_param)
struct take_cpu_down_param *param = _param;
int err;
- raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
- param->hcpu);
/* Ensure this CPU doesn't handle any more interrupts. */
err = __cpu_disable();
if (err < 0)
return err;
+ raw_notifier_call_chain(&cpu_chain, CPU_DYING | param->mod,
+ param->hcpu);
+
/* Force idle task to run as soon as we yield: it should
immediately notice cpu is offline and die quickly. */
sched_idle_next();
@@ -453,6 +454,25 @@ out:
}
#endif /* CONFIG_PM_SLEEP_SMP */
+/**
+ * notify_cpu_starting(cpu) - call the CPU_STARTING notifiers
+ * @cpu: cpu that just started
+ *
+ * This function calls the cpu_chain notifiers with CPU_STARTING.
+ * It must be called by the arch code on the new cpu, before the new cpu
+ * enables interrupts and before the "boot" cpu returns from __cpu_up().
+ */
+void notify_cpu_starting(unsigned int cpu)
+{
+ unsigned long val = CPU_STARTING;
+
+#ifdef CONFIG_PM_SLEEP_SMP
+ if (cpu_isset(cpu, frozen_cpus))
+ val = CPU_STARTING_FROZEN;
+#endif /* CONFIG_PM_SLEEP_SMP */
+ raw_notifier_call_chain(&cpu_chain, val, (void *)(long)cpu);
+}
+
#endif /* CONFIG_SMP */
/*
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 827cd9adccb..3e00526f52e 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1172,7 +1172,7 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
{
struct cpuset trialcs;
int err;
- int cpus_nonempty, balance_flag_changed;
+ int balance_flag_changed;
trialcs = *cs;
if (turning_on)
@@ -1184,7 +1184,6 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
if (err < 0)
return err;
- cpus_nonempty = !cpus_empty(trialcs.cpus_allowed);
balance_flag_changed = (is_sched_load_balance(cs) !=
is_sched_load_balance(&trialcs));
@@ -1192,7 +1191,7 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
cs->flags = trialcs.flags;
mutex_unlock(&callback_mutex);
- if (cpus_nonempty && balance_flag_changed)
+ if (!cpus_empty(trialcs.cpus_allowed) && balance_flag_changed)
async_rebuild_sched_domains();
return 0;
@@ -1921,7 +1920,7 @@ static void remove_tasks_in_empty_cpuset(struct cpuset *cs)
* that has tasks along with an empty 'mems'. But if we did see such
* a cpuset, we'd handle it just like we do if its 'cpus' was empty.
*/
-static void scan_for_empty_cpusets(const struct cpuset *root)
+static void scan_for_empty_cpusets(struct cpuset *root)
{
LIST_HEAD(queue);
struct cpuset *cp; /* scans cpusets being updated */
@@ -2437,19 +2436,15 @@ const struct file_operations proc_cpuset_operations = {
void cpuset_task_status_allowed(struct seq_file *m, struct task_struct *task)
{
seq_printf(m, "Cpus_allowed:\t");
- m->count += cpumask_scnprintf(m->buf + m->count, m->size - m->count,
- task->cpus_allowed);
+ seq_cpumask(m, &task->cpus_allowed);
seq_printf(m, "\n");
seq_printf(m, "Cpus_allowed_list:\t");
- m->count += cpulist_scnprintf(m->buf + m->count, m->size - m->count,
- task->cpus_allowed);
+ seq_cpumask_list(m, &task->cpus_allowed);
seq_printf(m, "\n");
seq_printf(m, "Mems_allowed:\t");
- m->count += nodemask_scnprintf(m->buf + m->count, m->size - m->count,
- task->mems_allowed);
+ seq_nodemask(m, &task->mems_allowed);
seq_printf(m, "\n");
seq_printf(m, "Mems_allowed_list:\t");
- m->count += nodelist_scnprintf(m->buf + m->count, m->size - m->count,
- task->mems_allowed);
+ seq_nodemask_list(m, &task->mems_allowed);
seq_printf(m, "\n");
}
diff --git a/kernel/dma-coherent.c b/kernel/dma-coherent.c
index c1d4d5b4c61..f013a0c2e11 100644
--- a/kernel/dma-coherent.c
+++ b/kernel/dma-coherent.c
@@ -124,6 +124,7 @@ int dma_alloc_from_coherent(struct device *dev, ssize_t size,
}
return (mem != NULL);
}
+EXPORT_SYMBOL(dma_alloc_from_coherent);
/**
* dma_release_from_coherent() - try to free the memory allocated from per-device coherent memory pool
@@ -151,3 +152,4 @@ int dma_release_from_coherent(struct device *dev, int order, void *vaddr)
}
return 0;
}
+EXPORT_SYMBOL(dma_release_from_coherent);
diff --git a/kernel/dma.c b/kernel/dma.c
index d2c60a82279..f903189c530 100644
--- a/kernel/dma.c
+++ b/kernel/dma.c
@@ -1,4 +1,4 @@
-/* $Id: dma.c,v 1.7 1994/12/28 03:35:33 root Exp root $
+/*
* linux/kernel/dma.c: A DMA channel allocator. Inspired by linux/kernel/irq.c.
*
* Written by Hennus Bergman, 1992.
diff --git a/kernel/exit.c b/kernel/exit.c
index 85a83c83185..80137a5d946 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -47,6 +47,7 @@
#include <linux/blkdev.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/tracehook.h>
+#include <trace/sched.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -112,8 +113,6 @@ static void __exit_signal(struct task_struct *tsk)
* We won't ever get here for the group leader, since it
* will have been the last reference on the signal_struct.
*/
- sig->utime = cputime_add(sig->utime, task_utime(tsk));
- sig->stime = cputime_add(sig->stime, task_stime(tsk));
sig->gtime = cputime_add(sig->gtime, task_gtime(tsk));
sig->min_flt += tsk->min_flt;
sig->maj_flt += tsk->maj_flt;
@@ -122,7 +121,6 @@ static void __exit_signal(struct task_struct *tsk)
sig->inblock += task_io_get_inblock(tsk);
sig->oublock += task_io_get_oublock(tsk);
task_io_accounting_add(&sig->ioac, &tsk->ioac);
- sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
sig = NULL; /* Marker for below. */
}
@@ -149,7 +147,10 @@ static void __exit_signal(struct task_struct *tsk)
static void delayed_put_task_struct(struct rcu_head *rhp)
{
- put_task_struct(container_of(rhp, struct task_struct, rcu));
+ struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
+
+ trace_sched_process_free(tsk);
+ put_task_struct(tsk);
}
@@ -640,24 +641,23 @@ retry:
assign_new_owner:
BUG_ON(c == p);
get_task_struct(c);
+ read_unlock(&tasklist_lock);
+ down_write(&mm->mmap_sem);
/*
* The task_lock protects c->mm from changing.
* We always want mm->owner->mm == mm
*/
task_lock(c);
- /*
- * Delay read_unlock() till we have the task_lock()
- * to ensure that c does not slip away underneath us
- */
- read_unlock(&tasklist_lock);
if (c->mm != mm) {
task_unlock(c);
+ up_write(&mm->mmap_sem);
put_task_struct(c);
goto retry;
}
cgroup_mm_owner_callbacks(mm->owner, c);
mm->owner = c;
task_unlock(c);
+ up_write(&mm->mmap_sem);
put_task_struct(c);
}
#endif /* CONFIG_MM_OWNER */
@@ -1074,6 +1074,8 @@ NORET_TYPE void do_exit(long code)
if (group_dead)
acct_process();
+ trace_sched_process_exit(tsk);
+
exit_sem(tsk);
exit_files(tsk);
exit_fs(tsk);
@@ -1302,6 +1304,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
if (likely(!traced)) {
struct signal_struct *psig;
struct signal_struct *sig;
+ struct task_cputime cputime;
/*
* The resource counters for the group leader are in its
@@ -1317,20 +1320,23 @@ static int wait_task_zombie(struct task_struct *p, int options,
* need to protect the access to p->parent->signal fields,
* as other threads in the parent group can be right
* here reaping other children at the same time.
+ *
+ * We use thread_group_cputime() to get times for the thread
+ * group, which consolidates times for all threads in the
+ * group including the group leader.
*/
spin_lock_irq(&p->parent->sighand->siglock);
psig = p->parent->signal;
sig = p->signal;
+ thread_group_cputime(p, &cputime);
psig->cutime =
cputime_add(psig->cutime,
- cputime_add(p->utime,
- cputime_add(sig->utime,
- sig->cutime)));
+ cputime_add(cputime.utime,
+ sig->cutime));
psig->cstime =
cputime_add(psig->cstime,
- cputime_add(p->stime,
- cputime_add(sig->stime,
- sig->cstime)));
+ cputime_add(cputime.stime,
+ sig->cstime));
psig->cgtime =
cputime_add(psig->cgtime,
cputime_add(p->gtime,
@@ -1675,6 +1681,8 @@ static long do_wait(enum pid_type type, struct pid *pid, int options,
struct task_struct *tsk;
int retval;
+ trace_sched_process_wait(pid);
+
add_wait_queue(&current->signal->wait_chldexit,&wait);
repeat:
/*
diff --git a/kernel/fork.c b/kernel/fork.c
index 7ce2ebe8479..4d093552dd6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -58,6 +58,7 @@
#include <linux/tty.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
+#include <trace/sched.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
@@ -759,15 +760,44 @@ void __cleanup_sighand(struct sighand_struct *sighand)
kmem_cache_free(sighand_cachep, sighand);
}
+
+/*
+ * Initialize POSIX timer handling for a thread group.
+ */
+static void posix_cpu_timers_init_group(struct signal_struct *sig)
+{
+ /* Thread group counters. */
+ thread_group_cputime_init(sig);
+
+ /* Expiration times and increments. */
+ sig->it_virt_expires = cputime_zero;
+ sig->it_virt_incr = cputime_zero;
+ sig->it_prof_expires = cputime_zero;
+ sig->it_prof_incr = cputime_zero;
+
+ /* Cached expiration times. */
+ sig->cputime_expires.prof_exp = cputime_zero;
+ sig->cputime_expires.virt_exp = cputime_zero;
+ sig->cputime_expires.sched_exp = 0;
+
+ /* The timer lists. */
+ INIT_LIST_HEAD(&sig->cpu_timers[0]);
+ INIT_LIST_HEAD(&sig->cpu_timers[1]);
+ INIT_LIST_HEAD(&sig->cpu_timers[2]);
+}
+
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
{
struct signal_struct *sig;
int ret;
if (clone_flags & CLONE_THREAD) {
- atomic_inc(&current->signal->count);
- atomic_inc(&current->signal->live);
- return 0;
+ ret = thread_group_cputime_clone_thread(current);
+ if (likely(!ret)) {
+ atomic_inc(&current->signal->count);
+ atomic_inc(&current->signal->live);
+ }
+ return ret;
}
sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
tsk->signal = sig;
@@ -795,39 +825,25 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
sig->it_real_incr.tv64 = 0;
sig->real_timer.function = it_real_fn;
- sig->it_virt_expires = cputime_zero;
- sig->it_virt_incr = cputime_zero;
- sig->it_prof_expires = cputime_zero;
- sig->it_prof_incr = cputime_zero;
-
sig->leader = 0; /* session leadership doesn't inherit */
sig->tty_old_pgrp = NULL;
+ sig->tty = NULL;
- sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
+ sig->cutime = sig->cstime = cputime_zero;
sig->gtime = cputime_zero;
sig->cgtime = cputime_zero;
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
task_io_accounting_init(&sig->ioac);
- sig->sum_sched_runtime = 0;
- INIT_LIST_HEAD(&sig->cpu_timers[0]);
- INIT_LIST_HEAD(&sig->cpu_timers[1]);
- INIT_LIST_HEAD(&sig->cpu_timers[2]);
taskstats_tgid_init(sig);
task_lock(current->group_leader);
memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
task_unlock(current->group_leader);
- if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
- /*
- * New sole thread in the process gets an expiry time
- * of the whole CPU time limit.
- */
- tsk->it_prof_expires =
- secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
- }
+ posix_cpu_timers_init_group(sig);
+
acct_init_pacct(&sig->pacct);
tty_audit_fork(sig);
@@ -837,7 +853,9 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
void __cleanup_signal(struct signal_struct *sig)
{
+ thread_group_cputime_free(sig);
exit_thread_group_keys(sig);
+ tty_kref_put(sig->tty);
kmem_cache_free(signal_cachep, sig);
}
@@ -886,6 +904,19 @@ void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
#endif /* CONFIG_MM_OWNER */
/*
+ * Initialize POSIX timer handling for a single task.
+ */
+static void posix_cpu_timers_init(struct task_struct *tsk)
+{
+ tsk->cputime_expires.prof_exp = cputime_zero;
+ tsk->cputime_expires.virt_exp = cputime_zero;
+ tsk->cputime_expires.sched_exp = 0;
+ INIT_LIST_HEAD(&tsk->cpu_timers[0]);
+ INIT_LIST_HEAD(&tsk->cpu_timers[1]);
+ INIT_LIST_HEAD(&tsk->cpu_timers[2]);
+}
+
+/*
* This creates a new process as a copy of the old one,
* but does not actually start it yet.
*
@@ -995,12 +1026,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
task_io_accounting_init(&p->ioac);
acct_clear_integrals(p);
- p->it_virt_expires = cputime_zero;
- p->it_prof_expires = cputime_zero;
- p->it_sched_expires = 0;
- INIT_LIST_HEAD(&p->cpu_timers[0]);
- INIT_LIST_HEAD(&p->cpu_timers[1]);
- INIT_LIST_HEAD(&p->cpu_timers[2]);
+ posix_cpu_timers_init(p);
p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
@@ -1201,21 +1227,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
if (clone_flags & CLONE_THREAD) {
p->group_leader = current->group_leader;
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
-
- if (!cputime_eq(current->signal->it_virt_expires,
- cputime_zero) ||
- !cputime_eq(current->signal->it_prof_expires,
- cputime_zero) ||
- current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY ||
- !list_empty(&current->signal->cpu_timers[0]) ||
- !list_empty(&current->signal->cpu_timers[1]) ||
- !list_empty(&current->signal->cpu_timers[2])) {
- /*
- * Have child wake up on its first tick to check
- * for process CPU timers.
- */
- p->it_prof_expires = jiffies_to_cputime(1);
- }
}
if (likely(p->pid)) {
@@ -1227,7 +1238,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->nsproxy->pid_ns->child_reaper = p;
p->signal->leader_pid = pid;
- p->signal->tty = current->signal->tty;
+ tty_kref_put(p->signal->tty);
+ p->signal->tty = tty_kref_get(current->signal->tty);
set_task_pgrp(p, task_pgrp_nr(current));
set_task_session(p, task_session_nr(current));
attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
@@ -1361,6 +1373,8 @@ long do_fork(unsigned long clone_flags,
if (!IS_ERR(p)) {
struct completion vfork;
+ trace_sched_process_fork(current, p);
+
nr = task_pid_vnr(p);
if (clone_flags & CLONE_PARENT_SETTID)
diff --git a/kernel/freezer.c b/kernel/freezer.c
new file mode 100644
index 00000000000..ba6248b323e
--- /dev/null
+++ b/kernel/freezer.c
@@ -0,0 +1,154 @@
+/*
+ * kernel/freezer.c - Function to freeze a process
+ *
+ * Originally from kernel/power/process.c
+ */
+
+#include <linux/interrupt.h>
+#include <linux/suspend.h>
+#include <linux/module.h>
+#include <linux/syscalls.h>
+#include <linux/freezer.h>
+
+/*
+ * freezing is complete, mark current process as frozen
+ */
+static inline void frozen_process(void)
+{
+ if (!unlikely(current->flags & PF_NOFREEZE)) {
+ current->flags |= PF_FROZEN;
+ wmb();
+ }
+ clear_freeze_flag(current);
+}
+
+/* Refrigerator is place where frozen processes are stored :-). */
+void refrigerator(void)
+{
+ /* Hmm, should we be allowed to suspend when there are realtime
+ processes around? */
+ long save;
+
+ task_lock(current);
+ if (freezing(current)) {
+ frozen_process();
+ task_unlock(current);
+ } else {
+ task_unlock(current);
+ return;
+ }
+ save = current->state;
+ pr_debug("%s entered refrigerator\n", current->comm);
+
+ spin_lock_irq(&current->sighand->siglock);
+ recalc_sigpending(); /* We sent fake signal, clean it up */
+ spin_unlock_irq(&current->sighand->siglock);
+
+ for (;;) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (!frozen(current))
+ break;
+ schedule();
+ }
+ pr_debug("%s left refrigerator\n", current->comm);
+ __set_current_state(save);
+}
+EXPORT_SYMBOL(refrigerator);
+
+static void fake_signal_wake_up(struct task_struct *p)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&p->sighand->siglock, flags);
+ signal_wake_up(p, 0);
+ spin_unlock_irqrestore(&p->sighand->siglock, flags);
+}
+
+/**
+ * freeze_task - send a freeze request to given task
+ * @p: task to send the request to
+ * @sig_only: if set, the request will only be sent if the task has the
+ * PF_FREEZER_NOSIG flag unset
+ * Return value: 'false', if @sig_only is set and the task has
+ * PF_FREEZER_NOSIG set or the task is frozen, 'true', otherwise
+ *
+ * The freeze request is sent by setting the tasks's TIF_FREEZE flag and
+ * either sending a fake signal to it or waking it up, depending on whether
+ * or not it has PF_FREEZER_NOSIG set. If @sig_only is set and the task
+ * has PF_FREEZER_NOSIG set (ie. it is a typical kernel thread), its
+ * TIF_FREEZE flag will not be set.
+ */
+bool freeze_task(struct task_struct *p, bool sig_only)
+{
+ /*
+ * We first check if the task is freezing and next if it has already
+ * been frozen to avoid the race with frozen_process() which first marks
+ * the task as frozen and next clears its TIF_FREEZE.
+ */
+ if (!freezing(p)) {
+ rmb();
+ if (frozen(p))
+ return false;
+
+ if (!sig_only || should_send_signal(p))
+ set_freeze_flag(p);
+ else
+ return false;
+ }
+
+ if (should_send_signal(p)) {
+ if (!signal_pending(p))
+ fake_signal_wake_up(p);
+ } else if (sig_only) {
+ return false;
+ } else {
+ wake_up_state(p, TASK_INTERRUPTIBLE);
+ }
+
+ return true;
+}
+
+void cancel_freezing(struct task_struct *p)
+{
+ unsigned long flags;
+
+ if (freezing(p)) {
+ pr_debug(" clean up: %s\n", p->comm);
+ clear_freeze_flag(p);
+ spin_lock_irqsave(&p->sighand->siglock, flags);
+ recalc_sigpending_and_wake(p);
+ spin_unlock_irqrestore(&p->sighand->siglock, flags);
+ }
+}
+
+/*
+ * Wake up a frozen process
+ *
+ * task_lock() is needed to prevent the race with refrigerator() which may
+ * occur if the freezing of tasks fails. Namely, without the lock, if the
+ * freezing of tasks failed, thaw_tasks() might have run before a task in
+ * refrigerator() could call frozen_process(), in which case the task would be
+ * frozen and no one would thaw it.
+ */
+int __thaw_process(struct task_struct *p)
+{
+ if (frozen(p)) {
+ p->flags &= ~PF_FROZEN;
+ return 1;
+ }
+ clear_freeze_flag(p);
+ return 0;
+}
+
+int thaw_process(struct task_struct *p)
+{
+ task_lock(p);
+ if (__thaw_process(p) == 1) {
+ task_unlock(p);
+ wake_up_process(p);
+ return 1;
+ }
+ task_unlock(p);
+ return 0;
+}
+EXPORT_SYMBOL(thaw_process);
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index cdec83e722f..95978f48e03 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1403,9 +1403,7 @@ void hrtimer_run_queues(void)
if (!base->first)
continue;
- if (base->get_softirq_time)
- base->softirq_time = base->get_softirq_time();
- else if (gettime) {
+ if (gettime) {
hrtimer_get_softirq_time(cpu_base);
gettime = 0;
}
@@ -1688,9 +1686,11 @@ static void migrate_hrtimers(int cpu)
new_base = &get_cpu_var(hrtimer_bases);
tick_cancel_sched_timer(cpu);
-
- local_irq_disable();
- spin_lock(&new_base->lock);
+ /*
+ * The caller is globally serialized and nobody else
+ * takes two locks at once, deadlock is not possible.
+ */
+ spin_lock_irq(&new_base->lock);
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
@@ -1703,8 +1703,7 @@ static void migrate_hrtimers(int cpu)
raise = 1;
spin_unlock(&old_base->lock);
- spin_unlock(&new_base->lock);
- local_irq_enable();
+ spin_unlock_irq(&new_base->lock);
put_cpu_var(hrtimer_bases);
if (raise)
diff --git a/kernel/irq/autoprobe.c b/kernel/irq/autoprobe.c
index 533068cfb60..cc0f7321b8c 100644
--- a/kernel/irq/autoprobe.c
+++ b/kernel/irq/autoprobe.c
@@ -30,17 +30,16 @@ static DEFINE_MUTEX(probing_active);
unsigned long probe_irq_on(void)
{
struct irq_desc *desc;
- unsigned long mask;
- unsigned int i;
+ unsigned long mask = 0;
+ unsigned int status;
+ int i;
mutex_lock(&probing_active);
/*
* something may have generated an irq long ago and we want to
* flush such a longstanding irq before considering it as spurious.
*/
- for (i = NR_IRQS-1; i > 0; i--) {
- desc = irq_desc + i;
-
+ for_each_irq_desc_reverse(i, desc) {
spin_lock_irq(&desc->lock);
if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
/*
@@ -68,9 +67,7 @@ unsigned long probe_irq_on(void)
* (we must startup again here because if a longstanding irq
* happened in the previous stage, it may have masked itself)
*/
- for (i = NR_IRQS-1; i > 0; i--) {
- desc = irq_desc + i;
-
+ for_each_irq_desc_reverse(i, desc) {
spin_lock_irq(&desc->lock);
if (!desc->action && !(desc->status & IRQ_NOPROBE)) {
desc->status |= IRQ_AUTODETECT | IRQ_WAITING;
@@ -88,11 +85,7 @@ unsigned long probe_irq_on(void)
/*
* Now filter out any obviously spurious interrupts
*/
- mask = 0;
- for (i = 0; i < NR_IRQS; i++) {
- unsigned int status;
-
- desc = irq_desc + i;
+ for_each_irq_desc(i, desc) {
spin_lock_irq(&desc->lock);
status = desc->status;
@@ -126,14 +119,11 @@ EXPORT_SYMBOL(probe_irq_on);
*/
unsigned int probe_irq_mask(unsigned long val)
{
- unsigned int mask;
+ unsigned int status, mask = 0;
+ struct irq_desc *desc;
int i;
- mask = 0;
- for (i = 0; i < NR_IRQS; i++) {
- struct irq_desc *desc = irq_desc + i;
- unsigned int status;
-
+ for_each_irq_desc(i, desc) {
spin_lock_irq(&desc->lock);
status = desc->status;
@@ -171,20 +161,19 @@ EXPORT_SYMBOL(probe_irq_mask);
*/
int probe_irq_off(unsigned long val)
{
- int i, irq_found = 0, nr_irqs = 0;
-
- for (i = 0; i < NR_IRQS; i++) {
- struct irq_desc *desc = irq_desc + i;
- unsigned int status;
+ int i, irq_found = 0, nr_of_irqs = 0;
+ struct irq_desc *desc;
+ unsigned int status;
+ for_each_irq_desc(i, desc) {
spin_lock_irq(&desc->lock);
status = desc->status;
if (status & IRQ_AUTODETECT) {
if (!(status & IRQ_WAITING)) {
- if (!nr_irqs)
+ if (!nr_of_irqs)
irq_found = i;
- nr_irqs++;
+ nr_of_irqs++;
}
desc->status = status & ~IRQ_AUTODETECT;
desc->chip->shutdown(i);
@@ -193,7 +182,7 @@ int probe_irq_off(unsigned long val)
}
mutex_unlock(&probing_active);
- if (nr_irqs > 1)
+ if (nr_of_irqs > 1)
irq_found = -irq_found;
return irq_found;
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 3cd441ebf5d..4895fde4eb9 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -24,16 +24,15 @@
*/
void dynamic_irq_init(unsigned int irq)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
return;
}
/* Ensure we don't have left over values from a previous use of this irq */
- desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
desc->status = IRQ_DISABLED;
desc->chip = &no_irq_chip;
@@ -57,15 +56,14 @@ void dynamic_irq_init(unsigned int irq)
*/
void dynamic_irq_cleanup(unsigned int irq)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
return;
}
- desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
if (desc->action) {
spin_unlock_irqrestore(&desc->lock, flags);
@@ -89,10 +87,10 @@ void dynamic_irq_cleanup(unsigned int irq)
*/
int set_irq_chip(unsigned int irq, struct irq_chip *chip)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq);
return -EINVAL;
}
@@ -100,7 +98,6 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
if (!chip)
chip = &no_irq_chip;
- desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
irq_chip_set_defaults(chip);
desc->chip = chip;
@@ -111,27 +108,27 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
EXPORT_SYMBOL(set_irq_chip);
/**
- * set_irq_type - set the irq type for an irq
+ * set_irq_type - set the irq trigger type for an irq
* @irq: irq number
- * @type: interrupt type - see include/linux/interrupt.h
+ * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
*/
int set_irq_type(unsigned int irq, unsigned int type)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
int ret = -ENXIO;
- if (irq >= NR_IRQS) {
+ if (!desc) {
printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
return -ENODEV;
}
- desc = irq_desc + irq;
- if (desc->chip->set_type) {
- spin_lock_irqsave(&desc->lock, flags);
- ret = desc->chip->set_type(irq, type);
- spin_unlock_irqrestore(&desc->lock, flags);
- }
+ if (type == IRQ_TYPE_NONE)
+ return 0;
+
+ spin_lock_irqsave(&desc->lock, flags);
+ ret = __irq_set_trigger(desc, irq, flags);
+ spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}
EXPORT_SYMBOL(set_irq_type);
@@ -145,16 +142,15 @@ EXPORT_SYMBOL(set_irq_type);
*/
int set_irq_data(unsigned int irq, void *data)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
printk(KERN_ERR
"Trying to install controller data for IRQ%d\n", irq);
return -EINVAL;
}
- desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
desc->handler_data = data;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -171,15 +167,15 @@ EXPORT_SYMBOL(set_irq_data);
*/
int set_irq_msi(unsigned int irq, struct msi_desc *entry)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
printk(KERN_ERR
"Trying to install msi data for IRQ%d\n", irq);
return -EINVAL;
}
- desc = irq_desc + irq;
+
spin_lock_irqsave(&desc->lock, flags);
desc->msi_desc = entry;
if (entry)
@@ -197,10 +193,16 @@ int set_irq_msi(unsigned int irq, struct msi_desc *entry)
*/
int set_irq_chip_data(unsigned int irq, void *data)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS || !desc->chip) {
+ if (!desc) {
+ printk(KERN_ERR
+ "Trying to install chip data for IRQ%d\n", irq);
+ return -EINVAL;
+ }
+
+ if (!desc->chip) {
printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
return -EINVAL;
}
@@ -218,7 +220,7 @@ EXPORT_SYMBOL(set_irq_chip_data);
*/
static void default_enable(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
desc->chip->unmask(irq);
desc->status &= ~IRQ_MASKED;
@@ -236,8 +238,9 @@ static void default_disable(unsigned int irq)
*/
static unsigned int default_startup(unsigned int irq)
{
- irq_desc[irq].chip->enable(irq);
+ struct irq_desc *desc = irq_to_desc(irq);
+ desc->chip->enable(irq);
return 0;
}
@@ -246,7 +249,7 @@ static unsigned int default_startup(unsigned int irq)
*/
static void default_shutdown(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
desc->chip->mask(irq);
desc->status |= IRQ_MASKED;
@@ -305,14 +308,13 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
{
struct irqaction *action;
irqreturn_t action_ret;
- const unsigned int cpu = smp_processor_id();
spin_lock(&desc->lock);
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
- kstat_cpu(cpu).irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
action = desc->action;
if (unlikely(!action || (desc->status & IRQ_DISABLED)))
@@ -344,7 +346,6 @@ out_unlock:
void
handle_level_irq(unsigned int irq, struct irq_desc *desc)
{
- unsigned int cpu = smp_processor_id();
struct irqaction *action;
irqreturn_t action_ret;
@@ -354,7 +355,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
- kstat_cpu(cpu).irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
/*
* If its disabled or no action available
@@ -392,7 +393,6 @@ out_unlock:
void
handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
{
- unsigned int cpu = smp_processor_id();
struct irqaction *action;
irqreturn_t action_ret;
@@ -402,7 +402,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
goto out;
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
- kstat_cpu(cpu).irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
/*
* If its disabled or no action available
@@ -451,8 +451,6 @@ out:
void
handle_edge_irq(unsigned int irq, struct irq_desc *desc)
{
- const unsigned int cpu = smp_processor_id();
-
spin_lock(&desc->lock);
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
@@ -468,8 +466,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
mask_ack_irq(desc, irq);
goto out_unlock;
}
-
- kstat_cpu(cpu).irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
/* Start handling the irq */
desc->chip->ack(irq);
@@ -524,7 +521,7 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
{
irqreturn_t action_ret;
- kstat_this_cpu.irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
if (desc->chip->ack)
desc->chip->ack(irq);
@@ -541,17 +538,15 @@ void
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
const char *name)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
printk(KERN_ERR
"Trying to install type control for IRQ%d\n", irq);
return;
}
- desc = irq_desc + irq;
-
if (!handle)
handle = handle_bad_irq;
else if (desc->chip == &no_irq_chip) {
@@ -583,7 +578,7 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
desc->status &= ~IRQ_DISABLED;
desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
desc->depth = 0;
- desc->chip->unmask(irq);
+ desc->chip->startup(irq);
}
spin_unlock_irqrestore(&desc->lock, flags);
}
@@ -606,17 +601,14 @@ set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
void __init set_irq_noprobe(unsigned int irq)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq);
-
return;
}
- desc = irq_desc + irq;
-
spin_lock_irqsave(&desc->lock, flags);
desc->status |= IRQ_NOPROBE;
spin_unlock_irqrestore(&desc->lock, flags);
@@ -624,17 +616,14 @@ void __init set_irq_noprobe(unsigned int irq)
void __init set_irq_probe(unsigned int irq)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS) {
+ if (!desc) {
printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq);
-
return;
}
- desc = irq_desc + irq;
-
spin_lock_irqsave(&desc->lock, flags);
desc->status &= ~IRQ_NOPROBE;
spin_unlock_irqrestore(&desc->lock, flags);
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 5fa6198e913..c815b42d0f5 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -25,11 +25,10 @@
*
* Handles spurious and unhandled IRQ's. It also prints a debugmessage.
*/
-void
-handle_bad_irq(unsigned int irq, struct irq_desc *desc)
+void handle_bad_irq(unsigned int irq, struct irq_desc *desc)
{
print_irq_desc(irq, desc);
- kstat_this_cpu.irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
ack_bad_irq(irq);
}
@@ -47,6 +46,9 @@ handle_bad_irq(unsigned int irq, struct irq_desc *desc)
*
* Controller mappings for all interrupt sources:
*/
+int nr_irqs = NR_IRQS;
+EXPORT_SYMBOL_GPL(nr_irqs);
+
struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
[0 ... NR_IRQS-1] = {
.status = IRQ_DISABLED,
@@ -66,7 +68,9 @@ struct irq_desc irq_desc[NR_IRQS] __cacheline_aligned_in_smp = {
*/
static void ack_bad(unsigned int irq)
{
- print_irq_desc(irq, irq_desc + irq);
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ print_irq_desc(irq, desc);
ack_bad_irq(irq);
}
@@ -131,8 +135,6 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
irqreturn_t ret, retval = IRQ_NONE;
unsigned int status = 0;
- handle_dynamic_tick(action);
-
if (!(action->flags & IRQF_DISABLED))
local_irq_enable_in_hardirq();
@@ -165,11 +167,12 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
*/
unsigned int __do_IRQ(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
unsigned int status;
- kstat_this_cpu.irqs[irq]++;
+ kstat_incr_irqs_this_cpu(irq, desc);
+
if (CHECK_IRQ_PER_CPU(desc->status)) {
irqreturn_t action_ret;
@@ -256,8 +259,8 @@ out:
}
#endif
-#ifdef CONFIG_TRACE_IRQFLAGS
+#ifdef CONFIG_TRACE_IRQFLAGS
/*
* lockdep: we want to handle all irq_desc locks as a single lock-class:
*/
@@ -265,10 +268,10 @@ static struct lock_class_key irq_desc_lock_class;
void early_init_irq_lock_class(void)
{
+ struct irq_desc *desc;
int i;
- for (i = 0; i < NR_IRQS; i++)
- lockdep_set_class(&irq_desc[i].lock, &irq_desc_lock_class);
+ for_each_irq_desc(i, desc)
+ lockdep_set_class(&desc->lock, &irq_desc_lock_class);
}
-
#endif
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 08a849a2244..c9767e64198 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -10,12 +10,15 @@ extern void irq_chip_set_defaults(struct irq_chip *chip);
/* Set default handler: */
extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
+extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
+ unsigned long flags);
+
#ifdef CONFIG_PROC_FS
-extern void register_irq_proc(unsigned int irq);
+extern void register_irq_proc(unsigned int irq, struct irq_desc *desc);
extern void register_handler_proc(unsigned int irq, struct irqaction *action);
extern void unregister_handler_proc(unsigned int irq, struct irqaction *action);
#else
-static inline void register_irq_proc(unsigned int irq) { }
+static inline void register_irq_proc(unsigned int irq, struct irq_desc *desc) { }
static inline void register_handler_proc(unsigned int irq,
struct irqaction *action) { }
static inline void unregister_handler_proc(unsigned int irq,
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0314074fa23..c498a1b8c62 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -31,10 +31,10 @@ cpumask_t irq_default_affinity = CPU_MASK_ALL;
*/
void synchronize_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned int status;
- if (irq >= NR_IRQS)
+ if (!desc)
return;
do {
@@ -64,7 +64,7 @@ EXPORT_SYMBOL(synchronize_irq);
*/
int irq_can_set_affinity(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
!desc->chip->set_affinity)
@@ -81,15 +81,21 @@ int irq_can_set_affinity(unsigned int irq)
*/
int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (!desc->chip->set_affinity)
return -EINVAL;
- set_balance_irq_affinity(irq, cpumask);
-
#ifdef CONFIG_GENERIC_PENDING_IRQ
- set_pending_irq(irq, cpumask);
+ if (desc->status & IRQ_MOVE_PCNTXT || desc->status & IRQ_DISABLED) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&desc->lock, flags);
+ desc->affinity = cpumask;
+ desc->chip->set_affinity(irq, cpumask);
+ spin_unlock_irqrestore(&desc->lock, flags);
+ } else
+ set_pending_irq(irq, cpumask);
#else
desc->affinity = cpumask;
desc->chip->set_affinity(irq, cpumask);
@@ -104,16 +110,17 @@ int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
int irq_select_affinity(unsigned int irq)
{
cpumask_t mask;
+ struct irq_desc *desc;
if (!irq_can_set_affinity(irq))
return 0;
cpus_and(mask, cpu_online_map, irq_default_affinity);
- irq_desc[irq].affinity = mask;
- irq_desc[irq].chip->set_affinity(irq, mask);
+ desc = irq_to_desc(irq);
+ desc->affinity = mask;
+ desc->chip->set_affinity(irq, mask);
- set_balance_irq_affinity(irq, mask);
return 0;
}
#endif
@@ -133,10 +140,10 @@ int irq_select_affinity(unsigned int irq)
*/
void disable_irq_nosync(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS)
+ if (!desc)
return;
spin_lock_irqsave(&desc->lock, flags);
@@ -162,9 +169,9 @@ EXPORT_SYMBOL(disable_irq_nosync);
*/
void disable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
- if (irq >= NR_IRQS)
+ if (!desc)
return;
disable_irq_nosync(irq);
@@ -204,10 +211,10 @@ static void __enable_irq(struct irq_desc *desc, unsigned int irq)
*/
void enable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
- if (irq >= NR_IRQS)
+ if (!desc)
return;
spin_lock_irqsave(&desc->lock, flags);
@@ -216,9 +223,9 @@ void enable_irq(unsigned int irq)
}
EXPORT_SYMBOL(enable_irq);
-int set_irq_wake_real(unsigned int irq, unsigned int on)
+static int set_irq_wake_real(unsigned int irq, unsigned int on)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
int ret = -ENXIO;
if (desc->chip->set_wake)
@@ -241,7 +248,7 @@ int set_irq_wake_real(unsigned int irq, unsigned int on)
*/
int set_irq_wake(unsigned int irq, unsigned int on)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
int ret = 0;
@@ -281,12 +288,16 @@ EXPORT_SYMBOL(set_irq_wake);
*/
int can_request_irq(unsigned int irq, unsigned long irqflags)
{
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
- if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
+ if (!desc)
+ return 0;
+
+ if (desc->status & IRQ_NOREQUEST)
return 0;
- action = irq_desc[irq].action;
+ action = desc->action;
if (action)
if (irqflags & action->flags & IRQF_SHARED)
action = NULL;
@@ -305,10 +316,11 @@ void compat_irq_chip_set_default_handler(struct irq_desc *desc)
desc->handle_irq = NULL;
}
-static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
+int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
unsigned long flags)
{
int ret;
+ struct irq_chip *chip = desc->chip;
if (!chip || !chip->set_type) {
/*
@@ -326,6 +338,11 @@ static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
(int)(flags & IRQF_TRIGGER_MASK),
irq, chip->set_type);
+ else {
+ /* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
+ desc->status &= ~IRQ_TYPE_SENSE_MASK;
+ desc->status |= flags & IRQ_TYPE_SENSE_MASK;
+ }
return ret;
}
@@ -334,16 +351,16 @@ static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
* Internal function to register an irqaction - typically used to
* allocate special interrupts that are part of the architecture.
*/
-int setup_irq(unsigned int irq, struct irqaction *new)
+static int
+__setup_irq(unsigned int irq, struct irq_desc * desc, struct irqaction *new)
{
- struct irq_desc *desc = irq_desc + irq;
struct irqaction *old, **p;
const char *old_name = NULL;
unsigned long flags;
int shared = 0;
int ret;
- if (irq >= NR_IRQS)
+ if (!desc)
return -EINVAL;
if (desc->chip == &no_irq_chip)
@@ -404,7 +421,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
/* Setup the type (level, edge polarity) if configured: */
if (new->flags & IRQF_TRIGGER_MASK) {
- ret = __irq_set_trigger(desc->chip, irq, new->flags);
+ ret = __irq_set_trigger(desc, irq, new->flags);
if (ret) {
spin_unlock_irqrestore(&desc->lock, flags);
@@ -423,16 +440,21 @@ int setup_irq(unsigned int irq, struct irqaction *new)
if (!(desc->status & IRQ_NOAUTOEN)) {
desc->depth = 0;
desc->status &= ~IRQ_DISABLED;
- if (desc->chip->startup)
- desc->chip->startup(irq);
- else
- desc->chip->enable(irq);
+ desc->chip->startup(irq);
} else
/* Undo nested disables: */
desc->depth = 1;
/* Set default affinity mask once everything is setup */
irq_select_affinity(irq);
+
+ } else if ((new->flags & IRQF_TRIGGER_MASK)
+ && (new->flags & IRQF_TRIGGER_MASK)
+ != (desc->status & IRQ_TYPE_SENSE_MASK)) {
+ /* hope the handler works with the actual trigger mode... */
+ pr_warning("IRQ %d uses trigger mode %d; requested %d\n",
+ irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK),
+ (int)(new->flags & IRQF_TRIGGER_MASK));
}
*p = new;
@@ -457,7 +479,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
spin_unlock_irqrestore(&desc->lock, flags);
new->irq = irq;
- register_irq_proc(irq);
+ register_irq_proc(irq, desc);
new->dir = NULL;
register_handler_proc(irq, new);
@@ -477,6 +499,20 @@ mismatch:
}
/**
+ * setup_irq - setup an interrupt
+ * @irq: Interrupt line to setup
+ * @act: irqaction for the interrupt
+ *
+ * Used to statically setup interrupts in the early boot process.
+ */
+int setup_irq(unsigned int irq, struct irqaction *act)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ return __setup_irq(irq, desc, act);
+}
+
+/**
* free_irq - free an interrupt
* @irq: Interrupt line to free
* @dev_id: Device identity to free
@@ -492,15 +528,15 @@ mismatch:
*/
void free_irq(unsigned int irq, void *dev_id)
{
- struct irq_desc *desc;
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction **p;
unsigned long flags;
WARN_ON(in_interrupt());
- if (irq >= NR_IRQS)
+
+ if (!desc)
return;
- desc = irq_desc + irq;
spin_lock_irqsave(&desc->lock, flags);
p = &desc->action;
for (;;) {
@@ -589,12 +625,14 @@ EXPORT_SYMBOL(free_irq);
* IRQF_SHARED Interrupt is shared
* IRQF_DISABLED Disable local interrupts while processing
* IRQF_SAMPLE_RANDOM The interrupt can be used for entropy
+ * IRQF_TRIGGER_* Specify active edge(s) or level
*
*/
int request_irq(unsigned int irq, irq_handler_t handler,
unsigned long irqflags, const char *devname, void *dev_id)
{
struct irqaction *action;
+ struct irq_desc *desc;
int retval;
#ifdef CONFIG_LOCKDEP
@@ -611,9 +649,12 @@ int request_irq(unsigned int irq, irq_handler_t handler,
*/
if ((irqflags & IRQF_SHARED) && !dev_id)
return -EINVAL;
- if (irq >= NR_IRQS)
+
+ desc = irq_to_desc(irq);
+ if (!desc)
return -EINVAL;
- if (irq_desc[irq].status & IRQ_NOREQUEST)
+
+ if (desc->status & IRQ_NOREQUEST)
return -EINVAL;
if (!handler)
return -EINVAL;
@@ -629,26 +670,29 @@ int request_irq(unsigned int irq, irq_handler_t handler,
action->next = NULL;
action->dev_id = dev_id;
+ retval = __setup_irq(irq, desc, action);
+ if (retval)
+ kfree(action);
+
#ifdef CONFIG_DEBUG_SHIRQ
if (irqflags & IRQF_SHARED) {
/*
* It's a shared IRQ -- the driver ought to be prepared for it
* to happen immediately, so let's make sure....
- * We do this before actually registering it, to make sure that
- * a 'real' IRQ doesn't run in parallel with our fake
+ * We disable the irq to make sure that a 'real' IRQ doesn't
+ * run in parallel with our fake.
*/
unsigned long flags;
+ disable_irq(irq);
local_irq_save(flags);
+
handler(irq, dev_id);
+
local_irq_restore(flags);
+ enable_irq(irq);
}
#endif
-
- retval = setup_irq(irq, action);
- if (retval)
- kfree(action);
-
return retval;
}
EXPORT_SYMBOL(request_irq);
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index 77b7acc875c..90b920d3f52 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -3,18 +3,18 @@
void set_pending_irq(unsigned int irq, cpumask_t mask)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
desc->status |= IRQ_MOVE_PENDING;
- irq_desc[irq].pending_mask = mask;
+ desc->pending_mask = mask;
spin_unlock_irqrestore(&desc->lock, flags);
}
void move_masked_irq(int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
cpumask_t tmp;
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
@@ -30,7 +30,7 @@ void move_masked_irq(int irq)
desc->status &= ~IRQ_MOVE_PENDING;
- if (unlikely(cpus_empty(irq_desc[irq].pending_mask)))
+ if (unlikely(cpus_empty(desc->pending_mask)))
return;
if (!desc->chip->set_affinity)
@@ -38,7 +38,7 @@ void move_masked_irq(int irq)
assert_spin_locked(&desc->lock);
- cpus_and(tmp, irq_desc[irq].pending_mask, cpu_online_map);
+ cpus_and(tmp, desc->pending_mask, cpu_online_map);
/*
* If there was a valid mask to work with, please
@@ -55,12 +55,12 @@ void move_masked_irq(int irq)
if (likely(!cpus_empty(tmp))) {
desc->chip->set_affinity(irq,tmp);
}
- cpus_clear(irq_desc[irq].pending_mask);
+ cpus_clear(desc->pending_mask);
}
void move_native_irq(int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index a09dd29c2fd..fac014a81b2 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -19,7 +19,7 @@ static struct proc_dir_entry *root_irq_dir;
static int irq_affinity_proc_show(struct seq_file *m, void *v)
{
- struct irq_desc *desc = irq_desc + (long)m->private;
+ struct irq_desc *desc = irq_to_desc((long)m->private);
cpumask_t *mask = &desc->affinity;
#ifdef CONFIG_GENERIC_PENDING_IRQ
@@ -43,7 +43,7 @@ static ssize_t irq_affinity_proc_write(struct file *file,
cpumask_t new_value;
int err;
- if (!irq_desc[irq].chip->set_affinity || no_irq_affinity ||
+ if (!irq_to_desc(irq)->chip->set_affinity || no_irq_affinity ||
irq_balancing_disabled(irq))
return -EIO;
@@ -132,20 +132,20 @@ static const struct file_operations default_affinity_proc_fops = {
static int irq_spurious_read(char *page, char **start, off_t off,
int count, int *eof, void *data)
{
- struct irq_desc *d = &irq_desc[(long) data];
+ struct irq_desc *desc = irq_to_desc((long) data);
return sprintf(page, "count %u\n"
"unhandled %u\n"
"last_unhandled %u ms\n",
- d->irq_count,
- d->irqs_unhandled,
- jiffies_to_msecs(d->last_unhandled));
+ desc->irq_count,
+ desc->irqs_unhandled,
+ jiffies_to_msecs(desc->last_unhandled));
}
#define MAX_NAMELEN 128
static int name_unique(unsigned int irq, struct irqaction *new_action)
{
- struct irq_desc *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_to_desc(irq);
struct irqaction *action;
unsigned long flags;
int ret = 1;
@@ -165,8 +165,9 @@ static int name_unique(unsigned int irq, struct irqaction *new_action)
void register_handler_proc(unsigned int irq, struct irqaction *action)
{
char name [MAX_NAMELEN];
+ struct irq_desc *desc = irq_to_desc(irq);
- if (!irq_desc[irq].dir || action->dir || !action->name ||
+ if (!desc->dir || action->dir || !action->name ||
!name_unique(irq, action))
return;
@@ -174,36 +175,34 @@ void register_handler_proc(unsigned int irq, struct irqaction *action)
snprintf(name, MAX_NAMELEN, "%s", action->name);
/* create /proc/irq/1234/handler/ */
- action->dir = proc_mkdir(name, irq_desc[irq].dir);
+ action->dir = proc_mkdir(name, desc->dir);
}
#undef MAX_NAMELEN
#define MAX_NAMELEN 10
-void register_irq_proc(unsigned int irq)
+void register_irq_proc(unsigned int irq, struct irq_desc *desc)
{
char name [MAX_NAMELEN];
struct proc_dir_entry *entry;
- if (!root_irq_dir ||
- (irq_desc[irq].chip == &no_irq_chip) ||
- irq_desc[irq].dir)
+ if (!root_irq_dir || (desc->chip == &no_irq_chip) || desc->dir)
return;
memset(name, 0, MAX_NAMELEN);
sprintf(name, "%d", irq);
/* create /proc/irq/1234 */
- irq_desc[irq].dir = proc_mkdir(name, root_irq_dir);
+ desc->dir = proc_mkdir(name, root_irq_dir);
#ifdef CONFIG_SMP
/* create /proc/irq/<irq>/smp_affinity */
- proc_create_data("smp_affinity", 0600, irq_desc[irq].dir,
+ proc_create_data("smp_affinity", 0600, desc->dir,
&irq_affinity_proc_fops, (void *)(long)irq);
#endif
- entry = create_proc_entry("spurious", 0444, irq_desc[irq].dir);
+ entry = create_proc_entry("spurious", 0444, desc->dir);
if (entry) {
entry->data = (void *)(long)irq;
entry->read_proc = irq_spurious_read;
@@ -214,8 +213,11 @@ void register_irq_proc(unsigned int irq)
void unregister_handler_proc(unsigned int irq, struct irqaction *action)
{
- if (action->dir)
- remove_proc_entry(action->dir->name, irq_desc[irq].dir);
+ if (action->dir) {
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ remove_proc_entry(action->dir->name, desc->dir);
+ }
}
void register_default_affinity_proc(void)
@@ -228,7 +230,8 @@ void register_default_affinity_proc(void)
void init_irq_proc(void)
{
- int i;
+ unsigned int irq;
+ struct irq_desc *desc;
/* create /proc/irq */
root_irq_dir = proc_mkdir("irq", NULL);
@@ -240,7 +243,7 @@ void init_irq_proc(void)
/*
* Create entries for all existing IRQs.
*/
- for (i = 0; i < NR_IRQS; i++)
- register_irq_proc(i);
+ for_each_irq_desc(irq, desc)
+ register_irq_proc(irq, desc);
}
diff --git a/kernel/irq/resend.c b/kernel/irq/resend.c
index a8046791ba2..89c7117acf2 100644
--- a/kernel/irq/resend.c
+++ b/kernel/irq/resend.c
@@ -33,10 +33,10 @@ static void resend_irqs(unsigned long arg)
struct irq_desc *desc;
int irq;
- while (!bitmap_empty(irqs_resend, NR_IRQS)) {
- irq = find_first_bit(irqs_resend, NR_IRQS);
+ while (!bitmap_empty(irqs_resend, nr_irqs)) {
+ irq = find_first_bit(irqs_resend, nr_irqs);
clear_bit(irq, irqs_resend);
- desc = irq_desc + irq;
+ desc = irq_to_desc(irq);
local_irq_disable();
desc->handle_irq(irq, desc);
local_irq_enable();
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index c66d3f10e85..dd364c11e56 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -12,83 +12,122 @@
#include <linux/kallsyms.h>
#include <linux/interrupt.h>
#include <linux/moduleparam.h>
+#include <linux/timer.h>
static int irqfixup __read_mostly;
+#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
+static void poll_spurious_irqs(unsigned long dummy);
+static DEFINE_TIMER(poll_spurious_irq_timer, poll_spurious_irqs, 0, 0);
+
/*
* Recovery handler for misrouted interrupts.
*/
-static int misrouted_irq(int irq)
+static int try_one_irq(int irq, struct irq_desc *desc)
{
- int i;
- int ok = 0;
- int work = 0; /* Did we do work for a real IRQ */
-
- for (i = 1; i < NR_IRQS; i++) {
- struct irq_desc *desc = irq_desc + i;
- struct irqaction *action;
-
- if (i == irq) /* Already tried */
- continue;
+ struct irqaction *action;
+ int ok = 0, work = 0;
- spin_lock(&desc->lock);
- /* Already running on another processor */
- if (desc->status & IRQ_INPROGRESS) {
- /*
- * Already running: If it is shared get the other
- * CPU to go looking for our mystery interrupt too
- */
- if (desc->action && (desc->action->flags & IRQF_SHARED))
- desc->status |= IRQ_PENDING;
- spin_unlock(&desc->lock);
- continue;
- }
- /* Honour the normal IRQ locking */
- desc->status |= IRQ_INPROGRESS;
- action = desc->action;
+ spin_lock(&desc->lock);
+ /* Already running on another processor */
+ if (desc->status & IRQ_INPROGRESS) {
+ /*
+ * Already running: If it is shared get the other
+ * CPU to go looking for our mystery interrupt too
+ */
+ if (desc->action && (desc->action->flags & IRQF_SHARED))
+ desc->status |= IRQ_PENDING;
spin_unlock(&desc->lock);
+ return ok;
+ }
+ /* Honour the normal IRQ locking */
+ desc->status |= IRQ_INPROGRESS;
+ action = desc->action;
+ spin_unlock(&desc->lock);
- while (action) {
- /* Only shared IRQ handlers are safe to call */
- if (action->flags & IRQF_SHARED) {
- if (action->handler(i, action->dev_id) ==
- IRQ_HANDLED)
- ok = 1;
- }
- action = action->next;
+ while (action) {
+ /* Only shared IRQ handlers are safe to call */
+ if (action->flags & IRQF_SHARED) {
+ if (action->handler(irq, action->dev_id) ==
+ IRQ_HANDLED)
+ ok = 1;
}
- local_irq_disable();
- /* Now clean up the flags */
- spin_lock(&desc->lock);
- action = desc->action;
+ action = action->next;
+ }
+ local_irq_disable();
+ /* Now clean up the flags */
+ spin_lock(&desc->lock);
+ action = desc->action;
+ /*
+ * While we were looking for a fixup someone queued a real
+ * IRQ clashing with our walk:
+ */
+ while ((desc->status & IRQ_PENDING) && action) {
/*
- * While we were looking for a fixup someone queued a real
- * IRQ clashing with our walk:
- */
- while ((desc->status & IRQ_PENDING) && action) {
- /*
- * Perform real IRQ processing for the IRQ we deferred
- */
- work = 1;
- spin_unlock(&desc->lock);
- handle_IRQ_event(i, action);
- spin_lock(&desc->lock);
- desc->status &= ~IRQ_PENDING;
- }
- desc->status &= ~IRQ_INPROGRESS;
- /*
- * If we did actual work for the real IRQ line we must let the
- * IRQ controller clean up too
+ * Perform real IRQ processing for the IRQ we deferred
*/
- if (work && desc->chip && desc->chip->end)
- desc->chip->end(i);
+ work = 1;
spin_unlock(&desc->lock);
+ handle_IRQ_event(irq, action);
+ spin_lock(&desc->lock);
+ desc->status &= ~IRQ_PENDING;
+ }
+ desc->status &= ~IRQ_INPROGRESS;
+ /*
+ * If we did actual work for the real IRQ line we must let the
+ * IRQ controller clean up too
+ */
+ if (work && desc->chip && desc->chip->end)
+ desc->chip->end(irq);
+ spin_unlock(&desc->lock);
+
+ return ok;
+}
+
+static int misrouted_irq(int irq)
+{
+ struct irq_desc *desc;
+ int i, ok = 0;
+
+ for_each_irq_desc(i, desc) {
+ if (!i)
+ continue;
+
+ if (i == irq) /* Already tried */
+ continue;
+
+ if (try_one_irq(i, desc))
+ ok = 1;
}
/* So the caller can adjust the irq error counts */
return ok;
}
+static void poll_spurious_irqs(unsigned long dummy)
+{
+ struct irq_desc *desc;
+ int i;
+
+ for_each_irq_desc(i, desc) {
+ unsigned int status;
+
+ if (!i)
+ continue;
+
+ /* Racy but it doesn't matter */
+ status = desc->status;
+ barrier();
+ if (!(status & IRQ_SPURIOUS_DISABLED))
+ continue;
+
+ try_one_irq(i, desc);
+ }
+
+ mod_timer(&poll_spurious_irq_timer,
+ jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
+}
+
/*
* If 99,900 of the previous 100,000 interrupts have not been handled
* then assume that the IRQ is stuck in some manner. Drop a diagnostic
@@ -137,7 +176,9 @@ report_bad_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
}
}
-static inline int try_misrouted_irq(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret)
+static inline int
+try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
+ irqreturn_t action_ret)
{
struct irqaction *action;
@@ -212,6 +253,9 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
desc->status |= IRQ_DISABLED | IRQ_SPURIOUS_DISABLED;
desc->depth++;
desc->chip->disable(irq);
+
+ mod_timer(&poll_spurious_irq_timer,
+ jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
}
desc->irqs_unhandled = 0;
}
@@ -241,7 +285,7 @@ static int __init irqfixup_setup(char *str)
__setup("irqfixup", irqfixup_setup);
module_param(irqfixup, int, 0644);
-MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode 2: irqpoll mode");
+MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode, 2: irqpoll mode");
static int __init irqpoll_setup(char *str)
{
diff --git a/kernel/itimer.c b/kernel/itimer.c
index ab982747d9b..db7c358b9a0 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -55,17 +55,15 @@ int do_getitimer(int which, struct itimerval *value)
spin_unlock_irq(&tsk->sighand->siglock);
break;
case ITIMER_VIRTUAL:
- read_lock(&tasklist_lock);
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_virt_expires;
cinterval = tsk->signal->it_virt_incr;
if (!cputime_eq(cval, cputime_zero)) {
- struct task_struct *t = tsk;
- cputime_t utime = tsk->signal->utime;
- do {
- utime = cputime_add(utime, t->utime);
- t = next_thread(t);
- } while (t != tsk);
+ struct task_cputime cputime;
+ cputime_t utime;
+
+ thread_group_cputime(tsk, &cputime);
+ utime = cputime.utime;
if (cputime_le(cval, utime)) { /* about to fire */
cval = jiffies_to_cputime(1);
} else {
@@ -73,25 +71,19 @@ int do_getitimer(int which, struct itimerval *value)
}
}
spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
cputime_to_timeval(cval, &value->it_value);
cputime_to_timeval(cinterval, &value->it_interval);
break;
case ITIMER_PROF:
- read_lock(&tasklist_lock);
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_prof_expires;
cinterval = tsk->signal->it_prof_incr;
if (!cputime_eq(cval, cputime_zero)) {
- struct task_struct *t = tsk;
- cputime_t ptime = cputime_add(tsk->signal->utime,
- tsk->signal->stime);
- do {
- ptime = cputime_add(ptime,
- cputime_add(t->utime,
- t->stime));
- t = next_thread(t);
- } while (t != tsk);
+ struct task_cputime times;
+ cputime_t ptime;
+
+ thread_group_cputime(tsk, &times);
+ ptime = cputime_add(times.utime, times.stime);
if (cputime_le(cval, ptime)) { /* about to fire */
cval = jiffies_to_cputime(1);
} else {
@@ -99,7 +91,6 @@ int do_getitimer(int which, struct itimerval *value)
}
}
spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
cputime_to_timeval(cval, &value->it_value);
cputime_to_timeval(cinterval, &value->it_interval);
break;
@@ -185,7 +176,6 @@ again:
case ITIMER_VIRTUAL:
nval = timeval_to_cputime(&value->it_value);
ninterval = timeval_to_cputime(&value->it_interval);
- read_lock(&tasklist_lock);
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_virt_expires;
cinterval = tsk->signal->it_virt_incr;
@@ -200,7 +190,6 @@ again:
tsk->signal->it_virt_expires = nval;
tsk->signal->it_virt_incr = ninterval;
spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
if (ovalue) {
cputime_to_timeval(cval, &ovalue->it_value);
cputime_to_timeval(cinterval, &ovalue->it_interval);
@@ -209,7 +198,6 @@ again:
case ITIMER_PROF:
nval = timeval_to_cputime(&value->it_value);
ninterval = timeval_to_cputime(&value->it_interval);
- read_lock(&tasklist_lock);
spin_lock_irq(&tsk->sighand->siglock);
cval = tsk->signal->it_prof_expires;
cinterval = tsk->signal->it_prof_incr;
@@ -224,7 +212,6 @@ again:
tsk->signal->it_prof_expires = nval;
tsk->signal->it_prof_incr = ninterval;
spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
if (ovalue) {
cputime_to_timeval(cval, &ovalue->it_value);
cputime_to_timeval(cinterval, &ovalue->it_interval);
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 38fc10ac754..5072cf1685a 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -260,7 +260,6 @@ const char *kallsyms_lookup(unsigned long addr,
/* see if it's in a module */
return module_address_lookup(addr, symbolsize, offset, modname,
namebuf);
- return NULL;
}
int lookup_symbol_name(unsigned long addr, char *symname)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index aef265325cd..ac0fde7b54d 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -30,6 +30,7 @@
#include <linux/pm.h>
#include <linux/cpu.h>
#include <linux/console.h>
+#include <linux/vmalloc.h>
#include <asm/page.h>
#include <asm/uaccess.h>
@@ -1371,6 +1372,7 @@ static int __init crash_save_vmcoreinfo_init(void)
VMCOREINFO_SYMBOL(node_online_map);
VMCOREINFO_SYMBOL(swapper_pg_dir);
VMCOREINFO_SYMBOL(_stext);
+ VMCOREINFO_SYMBOL(vmlist);
#ifndef CONFIG_NEED_MULTIPLE_NODES
VMCOREINFO_SYMBOL(mem_map);
@@ -1406,6 +1408,7 @@ static int __init crash_save_vmcoreinfo_init(void)
VMCOREINFO_OFFSET(free_area, free_list);
VMCOREINFO_OFFSET(list_head, next);
VMCOREINFO_OFFSET(list_head, prev);
+ VMCOREINFO_OFFSET(vm_struct, addr);
VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
VMCOREINFO_NUMBER(NR_FREE_PAGES);
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 2456d1a0bef..3d3c3ea3a02 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -113,7 +113,7 @@ int request_module(const char *fmt, ...)
return ret;
}
EXPORT_SYMBOL(request_module);
-#endif /* CONFIG_KMOD */
+#endif /* CONFIG_MODULES */
struct subprocess_info {
struct work_struct work;
@@ -265,7 +265,7 @@ static void __call_usermodehelper(struct work_struct *work)
}
}
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
/*
* If set, call_usermodehelper_exec() will exit immediately returning -EBUSY
* (used for preventing user land processes from being created after the user
@@ -288,39 +288,37 @@ static DECLARE_WAIT_QUEUE_HEAD(running_helpers_waitq);
*/
#define RUNNING_HELPERS_TIMEOUT (5 * HZ)
-static int usermodehelper_pm_callback(struct notifier_block *nfb,
- unsigned long action,
- void *ignored)
+/**
+ * usermodehelper_disable - prevent new helpers from being started
+ */
+int usermodehelper_disable(void)
{
long retval;
- switch (action) {
- case PM_HIBERNATION_PREPARE:
- case PM_SUSPEND_PREPARE:
- usermodehelper_disabled = 1;
- smp_mb();
- /*
- * From now on call_usermodehelper_exec() won't start any new
- * helpers, so it is sufficient if running_helpers turns out to
- * be zero at one point (it may be increased later, but that
- * doesn't matter).
- */
- retval = wait_event_timeout(running_helpers_waitq,
+ usermodehelper_disabled = 1;
+ smp_mb();
+ /*
+ * From now on call_usermodehelper_exec() won't start any new
+ * helpers, so it is sufficient if running_helpers turns out to
+ * be zero at one point (it may be increased later, but that
+ * doesn't matter).
+ */
+ retval = wait_event_timeout(running_helpers_waitq,
atomic_read(&running_helpers) == 0,
RUNNING_HELPERS_TIMEOUT);
- if (retval) {
- return NOTIFY_OK;
- } else {
- usermodehelper_disabled = 0;
- return NOTIFY_BAD;
- }
- case PM_POST_HIBERNATION:
- case PM_POST_SUSPEND:
- usermodehelper_disabled = 0;
- return NOTIFY_OK;
- }
+ if (retval)
+ return 0;
- return NOTIFY_DONE;
+ usermodehelper_disabled = 0;
+ return -EAGAIN;
+}
+
+/**
+ * usermodehelper_enable - allow new helpers to be started again
+ */
+void usermodehelper_enable(void)
+{
+ usermodehelper_disabled = 0;
}
static void helper_lock(void)
@@ -334,18 +332,12 @@ static void helper_unlock(void)
if (atomic_dec_and_test(&running_helpers))
wake_up(&running_helpers_waitq);
}
-
-static void register_pm_notifier_callback(void)
-{
- pm_notifier(usermodehelper_pm_callback, 0);
-}
-#else /* CONFIG_PM */
+#else /* CONFIG_PM_SLEEP */
#define usermodehelper_disabled 0
static inline void helper_lock(void) {}
static inline void helper_unlock(void) {}
-static inline void register_pm_notifier_callback(void) {}
-#endif /* CONFIG_PM */
+#endif /* CONFIG_PM_SLEEP */
/**
* call_usermodehelper_setup - prepare to call a usermode helper
@@ -515,5 +507,4 @@ void __init usermodehelper_init(void)
{
khelper_wq = create_singlethread_workqueue("khelper");
BUG_ON(!khelper_wq);
- register_pm_notifier_callback();
}
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 75bc2cd9ebc..8b57a2597f2 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -404,7 +404,7 @@ void kretprobe_hash_lock(struct task_struct *tsk,
spin_lock_irqsave(hlist_lock, *flags);
}
-void kretprobe_table_lock(unsigned long hash, unsigned long *flags)
+static void kretprobe_table_lock(unsigned long hash, unsigned long *flags)
{
spinlock_t *hlist_lock = kretprobe_table_lock_ptr(hash);
spin_lock_irqsave(hlist_lock, *flags);
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index e53bc30e9ba..08dd8ed86c7 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kexec.h>
+#include <linux/profile.h>
#include <linux/sched.h>
#define KERNEL_ATTR_RO(_name) \
@@ -53,6 +54,37 @@ static ssize_t uevent_helper_store(struct kobject *kobj,
KERNEL_ATTR_RW(uevent_helper);
#endif
+#ifdef CONFIG_PROFILING
+static ssize_t profiling_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", prof_on);
+}
+static ssize_t profiling_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ret;
+
+ if (prof_on)
+ return -EEXIST;
+ /*
+ * This eventually calls into get_option() which
+ * has a ton of callers and is not const. It is
+ * easiest to cast it away here.
+ */
+ profile_setup((char *)buf);
+ ret = profile_init();
+ if (ret)
+ return ret;
+ ret = create_proc_profile();
+ if (ret)
+ return ret;
+ return count;
+}
+KERNEL_ATTR_RW(profiling);
+#endif
+
#ifdef CONFIG_KEXEC
static ssize_t kexec_loaded_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
@@ -109,6 +141,9 @@ static struct attribute * kernel_attrs[] = {
&uevent_seqnum_attr.attr,
&uevent_helper_attr.attr,
#endif
+#ifdef CONFIG_PROFILING
+ &profiling_attr.attr,
+#endif
#ifdef CONFIG_KEXEC
&kexec_loaded_attr.attr,
&kexec_crash_loaded_attr.attr,
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 96cff2f8710..8e7a7ce3ed0 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -13,6 +13,7 @@
#include <linux/file.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <trace/sched.h>
#define KTHREAD_NICE_LEVEL (-5)
@@ -171,12 +172,11 @@ EXPORT_SYMBOL(kthread_create);
*/
void kthread_bind(struct task_struct *k, unsigned int cpu)
{
- if (k->state != TASK_UNINTERRUPTIBLE) {
+ /* Must have done schedule() in kthread() before we set_task_cpu */
+ if (!wait_task_inactive(k, TASK_UNINTERRUPTIBLE)) {
WARN_ON(1);
return;
}
- /* Must have done schedule() in kthread() before we set_task_cpu */
- wait_task_inactive(k, 0);
set_task_cpu(k, cpu);
k->cpus_allowed = cpumask_of_cpu(cpu);
k->rt.nr_cpus_allowed = 1;
@@ -206,6 +206,8 @@ int kthread_stop(struct task_struct *k)
/* It could exit after stop_info.k set, but before wake_up_process. */
get_task_struct(k);
+ trace_sched_kthread_stop(k);
+
/* Must init completion *before* thread sees kthread_stop_info.k */
init_completion(&kthread_stop_info.done);
smp_wmb();
@@ -221,6 +223,8 @@ int kthread_stop(struct task_struct *k)
ret = kthread_stop_info.err;
mutex_unlock(&kthread_stop_lock);
+ trace_sched_kthread_stop_ret(ret);
+
return ret;
}
EXPORT_SYMBOL(kthread_stop);
diff --git a/kernel/marker.c b/kernel/marker.c
index 7d1faecd7a5..e9c6b2bc940 100644
--- a/kernel/marker.c
+++ b/kernel/marker.c
@@ -62,7 +62,7 @@ struct marker_entry {
int refcount; /* Number of times armed. 0 if disarmed. */
struct rcu_head rcu;
void *oldptr;
- unsigned char rcu_pending:1;
+ int rcu_pending;
unsigned char ptype:1;
char name[0]; /* Contains name'\0'format'\0' */
};
@@ -103,11 +103,11 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
char ptype;
/*
- * preempt_disable does two things : disabling preemption to make sure
- * the teardown of the callbacks can be done correctly when they are in
- * modules and they insure RCU read coherency.
+ * rcu_read_lock_sched does two things : disabling preemption to make
+ * sure the teardown of the callbacks can be done correctly when they
+ * are in modules and they insure RCU read coherency.
*/
- preempt_disable();
+ rcu_read_lock_sched();
ptype = mdata->ptype;
if (likely(!ptype)) {
marker_probe_func *func;
@@ -145,7 +145,7 @@ void marker_probe_cb(const struct marker *mdata, void *call_private, ...)
va_end(args);
}
}
- preempt_enable();
+ rcu_read_unlock_sched();
}
EXPORT_SYMBOL_GPL(marker_probe_cb);
@@ -162,7 +162,7 @@ void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
va_list args; /* not initialized */
char ptype;
- preempt_disable();
+ rcu_read_lock_sched();
ptype = mdata->ptype;
if (likely(!ptype)) {
marker_probe_func *func;
@@ -195,7 +195,7 @@ void marker_probe_cb_noarg(const struct marker *mdata, void *call_private, ...)
multi[i].func(multi[i].probe_private, call_private,
mdata->format, &args);
}
- preempt_enable();
+ rcu_read_unlock_sched();
}
EXPORT_SYMBOL_GPL(marker_probe_cb_noarg);
@@ -560,7 +560,7 @@ static int set_marker(struct marker_entry **entry, struct marker *elem,
* Disable a marker and its probe callback.
* Note: only waiting an RCU period after setting elem->call to the empty
* function insures that the original callback is not used anymore. This insured
- * by preempt_disable around the call site.
+ * by rcu_read_lock_sched around the call site.
*/
static void disable_marker(struct marker *elem)
{
@@ -653,11 +653,17 @@ int marker_probe_register(const char *name, const char *format,
entry = get_marker(name);
if (!entry) {
entry = add_marker(name, format);
- if (IS_ERR(entry)) {
+ if (IS_ERR(entry))
ret = PTR_ERR(entry);
- goto end;
- }
+ } else if (format) {
+ if (!entry->format)
+ ret = marker_set_format(&entry, format);
+ else if (strcmp(entry->format, format))
+ ret = -EPERM;
}
+ if (ret)
+ goto end;
+
/*
* If we detect that a call_rcu is pending for this marker,
* make sure it's executed now.
@@ -674,6 +680,8 @@ int marker_probe_register(const char *name, const char *format,
mutex_lock(&markers_mutex);
entry = get_marker(name);
WARN_ON(!entry);
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
entry->oldptr = old;
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
@@ -717,6 +725,8 @@ int marker_probe_unregister(const char *name,
entry = get_marker(name);
if (!entry)
goto end;
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
entry->oldptr = old;
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
@@ -795,6 +805,8 @@ int marker_probe_unregister_private_data(marker_probe_func *probe,
mutex_lock(&markers_mutex);
entry = get_marker_from_private_data(probe, probe_private);
WARN_ON(!entry);
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
entry->oldptr = old;
entry->rcu_pending = 1;
/* write rcu_pending before calling the RCU callback */
diff --git a/kernel/module.c b/kernel/module.c
index 9db11911e04..0d8d21ee792 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -46,6 +46,8 @@
#include <asm/cacheflush.h>
#include <linux/license.h>
#include <asm/sections.h>
+#include <linux/tracepoint.h>
+#include <linux/ftrace.h>
#if 0
#define DEBUGP printk
@@ -100,7 +102,7 @@ static inline int strong_try_module_get(struct module *mod)
static inline void add_taint_module(struct module *mod, unsigned flag)
{
add_taint(flag);
- mod->taints |= flag;
+ mod->taints |= (1U << flag);
}
/*
@@ -784,6 +786,7 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
mutex_lock(&module_mutex);
/* Store the name of the last unloaded module for diagnostic purposes */
strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
+ unregister_dynamic_debug_module(mod->name);
free_module(mod);
out:
@@ -923,7 +926,7 @@ static const char vermagic[] = VERMAGIC_STRING;
static int try_to_force_load(struct module *mod, const char *symname)
{
#ifdef CONFIG_MODULE_FORCE_LOAD
- if (!(tainted & TAINT_FORCED_MODULE))
+ if (!test_taint(TAINT_FORCED_MODULE))
printk("%s: no version for \"%s\" found: kernel tainted.\n",
mod->name, symname);
add_taint_module(mod, TAINT_FORCED_MODULE);
@@ -1033,7 +1036,7 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
const unsigned long *crc;
ret = find_symbol(name, &owner, &crc,
- !(mod->taints & TAINT_PROPRIETARY_MODULE), true);
+ !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
if (!IS_ERR_VALUE(ret)) {
/* use_module can fail due to OOM,
or module initialization or unloading */
@@ -1173,7 +1176,7 @@ static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
while (i-- > 0)
sysfs_remove_bin_file(notes_attrs->dir,
&notes_attrs->attrs[i]);
- kobject_del(notes_attrs->dir);
+ kobject_put(notes_attrs->dir);
}
kfree(notes_attrs);
}
@@ -1429,6 +1432,9 @@ static void free_module(struct module *mod)
/* Module unload stuff */
module_unload_free(mod);
+ /* release any pointers to mcount in this module */
+ ftrace_release(mod->module_core, mod->core_size);
+
/* This may be NULL, but that's OK */
module_free(mod, mod->module_init);
kfree(mod->args);
@@ -1634,7 +1640,7 @@ static void set_license(struct module *mod, const char *license)
license = "unspecified";
if (!license_is_gpl_compatible(license)) {
- if (!(tainted & TAINT_PROPRIETARY_MODULE))
+ if (!test_taint(TAINT_PROPRIETARY_MODULE))
printk(KERN_WARNING "%s: module license '%s' taints "
"kernel.\n", mod->name, license);
add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
@@ -1783,6 +1789,33 @@ static inline void add_kallsyms(struct module *mod,
}
#endif /* CONFIG_KALLSYMS */
+#ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
+static void dynamic_printk_setup(Elf_Shdr *sechdrs, unsigned int verboseindex)
+{
+ struct mod_debug *debug_info;
+ unsigned long pos, end;
+ unsigned int num_verbose;
+
+ pos = sechdrs[verboseindex].sh_addr;
+ num_verbose = sechdrs[verboseindex].sh_size /
+ sizeof(struct mod_debug);
+ end = pos + (num_verbose * sizeof(struct mod_debug));
+
+ for (; pos < end; pos += sizeof(struct mod_debug)) {
+ debug_info = (struct mod_debug *)pos;
+ register_dynamic_debug_module(debug_info->modname,
+ debug_info->type, debug_info->logical_modname,
+ debug_info->flag_names, debug_info->hash,
+ debug_info->hash2);
+ }
+}
+#else
+static inline void dynamic_printk_setup(Elf_Shdr *sechdrs,
+ unsigned int verboseindex)
+{
+}
+#endif /* CONFIG_DYNAMIC_PRINTK_DEBUG */
+
static void *module_alloc_update_bounds(unsigned long size)
{
void *ret = module_alloc(size);
@@ -1806,6 +1839,7 @@ static noinline struct module *load_module(void __user *umod,
Elf_Ehdr *hdr;
Elf_Shdr *sechdrs;
char *secstrings, *args, *modmagic, *strtab = NULL;
+ char *staging;
unsigned int i;
unsigned int symindex = 0;
unsigned int strindex = 0;
@@ -1831,9 +1865,14 @@ static noinline struct module *load_module(void __user *umod,
#endif
unsigned int markersindex;
unsigned int markersstringsindex;
+ unsigned int verboseindex;
+ unsigned int tracepointsindex;
+ unsigned int tracepointsstringsindex;
+ unsigned int mcountindex;
struct module *mod;
long err = 0;
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
+ void *mseg;
struct exception_table_entry *extable;
mm_segment_t old_fs;
@@ -1960,6 +1999,14 @@ static noinline struct module *load_module(void __user *umod,
goto free_hdr;
}
+ staging = get_modinfo(sechdrs, infoindex, "staging");
+ if (staging) {
+ add_taint_module(mod, TAINT_CRAP);
+ printk(KERN_WARNING "%s: module is from the staging directory,"
+ " the quality is unknown, you have been warned.\n",
+ mod->name);
+ }
+
/* Now copy in args */
args = strndup_user(uargs, ~0UL >> 1);
if (IS_ERR(args)) {
@@ -2117,6 +2164,13 @@ static noinline struct module *load_module(void __user *umod,
markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
markersstringsindex = find_sec(hdr, sechdrs, secstrings,
"__markers_strings");
+ verboseindex = find_sec(hdr, sechdrs, secstrings, "__verbose");
+ tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints");
+ tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings,
+ "__tracepoints_strings");
+
+ mcountindex = find_sec(hdr, sechdrs, secstrings,
+ "__mcount_loc");
/* Now do relocations. */
for (i = 1; i < hdr->e_shnum; i++) {
@@ -2144,6 +2198,12 @@ static noinline struct module *load_module(void __user *umod,
mod->num_markers =
sechdrs[markersindex].sh_size / sizeof(*mod->markers);
#endif
+#ifdef CONFIG_TRACEPOINTS
+ mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr;
+ mod->num_tracepoints =
+ sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints);
+#endif
+
/* Find duplicate symbols */
err = verify_export_symbols(mod);
@@ -2162,11 +2222,22 @@ static noinline struct module *load_module(void __user *umod,
add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
+ if (!mod->taints) {
#ifdef CONFIG_MARKERS
- if (!mod->taints)
marker_update_probe_range(mod->markers,
mod->markers + mod->num_markers);
#endif
+ dynamic_printk_setup(sechdrs, verboseindex);
+#ifdef CONFIG_TRACEPOINTS
+ tracepoint_update_probe_range(mod->tracepoints,
+ mod->tracepoints + mod->num_tracepoints);
+#endif
+ }
+
+ /* sechdrs[0].sh_size is always zero */
+ mseg = (void *)sechdrs[mcountindex].sh_addr;
+ ftrace_init_module(mseg, mseg + sechdrs[mcountindex].sh_size);
+
err = module_finalize(hdr, sechdrs, mod);
if (err < 0)
goto cleanup;
@@ -2236,6 +2307,7 @@ static noinline struct module *load_module(void __user *umod,
cleanup:
kobject_del(&mod->mkobj.kobj);
kobject_put(&mod->mkobj.kobj);
+ ftrace_release(mod->module_core, mod->core_size);
free_unload:
module_unload_free(mod);
module_free(mod, mod->module_init);
@@ -2552,10 +2624,12 @@ static char *module_flags(struct module *mod, char *buf)
mod->state == MODULE_STATE_GOING ||
mod->state == MODULE_STATE_COMING) {
buf[bx++] = '(';
- if (mod->taints & TAINT_PROPRIETARY_MODULE)
+ if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
buf[bx++] = 'P';
- if (mod->taints & TAINT_FORCED_MODULE)
+ if (mod->taints & (1 << TAINT_FORCED_MODULE))
buf[bx++] = 'F';
+ if (mod->taints & (1 << TAINT_CRAP))
+ buf[bx++] = 'C';
/*
* TAINT_FORCED_RMMOD: could be added.
* TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
@@ -2717,3 +2791,50 @@ void module_update_markers(void)
mutex_unlock(&module_mutex);
}
#endif
+
+#ifdef CONFIG_TRACEPOINTS
+void module_update_tracepoints(void)
+{
+ struct module *mod;
+
+ mutex_lock(&module_mutex);
+ list_for_each_entry(mod, &modules, list)
+ if (!mod->taints)
+ tracepoint_update_probe_range(mod->tracepoints,
+ mod->tracepoints + mod->num_tracepoints);
+ mutex_unlock(&module_mutex);
+}
+
+/*
+ * Returns 0 if current not found.
+ * Returns 1 if current found.
+ */
+int module_get_iter_tracepoints(struct tracepoint_iter *iter)
+{
+ struct module *iter_mod;
+ int found = 0;
+
+ mutex_lock(&module_mutex);
+ list_for_each_entry(iter_mod, &modules, list) {
+ if (!iter_mod->taints) {
+ /*
+ * Sorted module list
+ */
+ if (iter_mod < iter->module)
+ continue;
+ else if (iter_mod > iter->module)
+ iter->tracepoint = NULL;
+ found = tracepoint_get_iter_range(&iter->tracepoint,
+ iter_mod->tracepoints,
+ iter_mod->tracepoints
+ + iter_mod->num_tracepoints);
+ if (found) {
+ iter->module = iter_mod;
+ break;
+ }
+ }
+ }
+ mutex_unlock(&module_mutex);
+ return found;
+}
+#endif
diff --git a/kernel/notifier.c b/kernel/notifier.c
index 823be11584e..4282c0a40a5 100644
--- a/kernel/notifier.c
+++ b/kernel/notifier.c
@@ -550,7 +550,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
static ATOMIC_NOTIFIER_HEAD(die_chain);
-int notify_die(enum die_val val, const char *str,
+int notrace notify_die(enum die_val val, const char *str,
struct pt_regs *regs, long err, int trap, int sig)
{
struct die_args args = {
diff --git a/kernel/panic.c b/kernel/panic.c
index 12c5a0a6c89..bda561ef3cd 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -23,7 +23,7 @@
#include <linux/kallsyms.h>
int panic_on_oops;
-int tainted;
+static unsigned long tainted_mask;
static int pause_on_oops;
static int pause_on_oops_flag;
static DEFINE_SPINLOCK(pause_on_oops_lock);
@@ -143,6 +143,27 @@ NORET_TYPE void panic(const char * fmt, ...)
EXPORT_SYMBOL(panic);
+
+struct tnt {
+ u8 bit;
+ char true;
+ char false;
+};
+
+static const struct tnt tnts[] = {
+ { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
+ { TAINT_FORCED_MODULE, 'F', ' ' },
+ { TAINT_UNSAFE_SMP, 'S', ' ' },
+ { TAINT_FORCED_RMMOD, 'R', ' ' },
+ { TAINT_MACHINE_CHECK, 'M', ' ' },
+ { TAINT_BAD_PAGE, 'B', ' ' },
+ { TAINT_USER, 'U', ' ' },
+ { TAINT_DIE, 'D', ' ' },
+ { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
+ { TAINT_WARN, 'W', ' ' },
+ { TAINT_CRAP, 'C', ' ' },
+};
+
/**
* print_tainted - return a string to represent the kernel taint state.
*
@@ -155,35 +176,45 @@ EXPORT_SYMBOL(panic);
* 'U' - Userspace-defined naughtiness.
* 'A' - ACPI table overridden.
* 'W' - Taint on warning.
+ * 'C' - modules from drivers/staging are loaded.
*
* The string is overwritten by the next call to print_taint().
*/
-
const char *print_tainted(void)
{
- static char buf[20];
- if (tainted) {
- snprintf(buf, sizeof(buf), "Tainted: %c%c%c%c%c%c%c%c%c%c",
- tainted & TAINT_PROPRIETARY_MODULE ? 'P' : 'G',
- tainted & TAINT_FORCED_MODULE ? 'F' : ' ',
- tainted & TAINT_UNSAFE_SMP ? 'S' : ' ',
- tainted & TAINT_FORCED_RMMOD ? 'R' : ' ',
- tainted & TAINT_MACHINE_CHECK ? 'M' : ' ',
- tainted & TAINT_BAD_PAGE ? 'B' : ' ',
- tainted & TAINT_USER ? 'U' : ' ',
- tainted & TAINT_DIE ? 'D' : ' ',
- tainted & TAINT_OVERRIDDEN_ACPI_TABLE ? 'A' : ' ',
- tainted & TAINT_WARN ? 'W' : ' ');
- }
- else
+ static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
+
+ if (tainted_mask) {
+ char *s;
+ int i;
+
+ s = buf + sprintf(buf, "Tainted: ");
+ for (i = 0; i < ARRAY_SIZE(tnts); i++) {
+ const struct tnt *t = &tnts[i];
+ *s++ = test_bit(t->bit, &tainted_mask) ?
+ t->true : t->false;
+ }
+ *s = 0;
+ } else
snprintf(buf, sizeof(buf), "Not tainted");
return(buf);
}
+int test_taint(unsigned flag)
+{
+ return test_bit(flag, &tainted_mask);
+}
+EXPORT_SYMBOL(test_taint);
+
+unsigned long get_taint(void)
+{
+ return tainted_mask;
+}
+
void add_taint(unsigned flag)
{
debug_locks = 0; /* can't trust the integrity of the kernel anymore */
- tainted |= flag;
+ set_bit(flag, &tainted_mask);
}
EXPORT_SYMBOL(add_taint);
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index c42a03aef36..153dcb2639c 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -7,6 +7,93 @@
#include <linux/errno.h>
#include <linux/math64.h>
#include <asm/uaccess.h>
+#include <linux/kernel_stat.h>
+
+/*
+ * Allocate the thread_group_cputime structure appropriately and fill in the
+ * current values of the fields. Called from copy_signal() via
+ * thread_group_cputime_clone_thread() when adding a second or subsequent
+ * thread to a thread group. Assumes interrupts are enabled when called.
+ */
+int thread_group_cputime_alloc(struct task_struct *tsk)
+{
+ struct signal_struct *sig = tsk->signal;
+ struct task_cputime *cputime;
+
+ /*
+ * If we have multiple threads and we don't already have a
+ * per-CPU task_cputime struct (checked in the caller), allocate
+ * one and fill it in with the times accumulated so far. We may
+ * race with another thread so recheck after we pick up the sighand
+ * lock.
+ */
+ cputime = alloc_percpu(struct task_cputime);
+ if (cputime == NULL)
+ return -ENOMEM;
+ spin_lock_irq(&tsk->sighand->siglock);
+ if (sig->cputime.totals) {
+ spin_unlock_irq(&tsk->sighand->siglock);
+ free_percpu(cputime);
+ return 0;
+ }
+ sig->cputime.totals = cputime;
+ cputime = per_cpu_ptr(sig->cputime.totals, smp_processor_id());
+ cputime->utime = tsk->utime;
+ cputime->stime = tsk->stime;
+ cputime->sum_exec_runtime = tsk->se.sum_exec_runtime;
+ spin_unlock_irq(&tsk->sighand->siglock);
+ return 0;
+}
+
+/**
+ * thread_group_cputime - Sum the thread group time fields across all CPUs.
+ *
+ * @tsk: The task we use to identify the thread group.
+ * @times: task_cputime structure in which we return the summed fields.
+ *
+ * Walk the list of CPUs to sum the per-CPU time fields in the thread group
+ * time structure.
+ */
+void thread_group_cputime(
+ struct task_struct *tsk,
+ struct task_cputime *times)
+{
+ struct signal_struct *sig;
+ int i;
+ struct task_cputime *tot;
+
+ sig = tsk->signal;
+ if (unlikely(!sig) || !sig->cputime.totals) {
+ times->utime = tsk->utime;
+ times->stime = tsk->stime;
+ times->sum_exec_runtime = tsk->se.sum_exec_runtime;
+ return;
+ }
+ times->stime = times->utime = cputime_zero;
+ times->sum_exec_runtime = 0;
+ for_each_possible_cpu(i) {
+ tot = per_cpu_ptr(tsk->signal->cputime.totals, i);
+ times->utime = cputime_add(times->utime, tot->utime);
+ times->stime = cputime_add(times->stime, tot->stime);
+ times->sum_exec_runtime += tot->sum_exec_runtime;
+ }
+}
+
+/*
+ * Called after updating RLIMIT_CPU to set timer expiration if necessary.
+ */
+void update_rlimit_cpu(unsigned long rlim_new)
+{
+ cputime_t cputime;
+
+ cputime = secs_to_cputime(rlim_new);
+ if (cputime_eq(current->signal->it_prof_expires, cputime_zero) ||
+ cputime_lt(current->signal->it_prof_expires, cputime)) {
+ spin_lock_irq(&current->sighand->siglock);
+ set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
+ spin_unlock_irq(&current->sighand->siglock);
+ }
+}
static int check_clock(const clockid_t which_clock)
{
@@ -158,10 +245,6 @@ static inline cputime_t virt_ticks(struct task_struct *p)
{
return p->utime;
}
-static inline unsigned long long sched_ns(struct task_struct *p)
-{
- return task_sched_runtime(p);
-}
int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
{
@@ -211,7 +294,7 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
cpu->cpu = virt_ticks(p);
break;
case CPUCLOCK_SCHED:
- cpu->sched = sched_ns(p);
+ cpu->sched = p->se.sum_exec_runtime + task_delta_exec(p);
break;
}
return 0;
@@ -220,59 +303,30 @@ static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p,
/*
* Sample a process (thread group) clock for the given group_leader task.
* Must be called with tasklist_lock held for reading.
- * Must be called with tasklist_lock held for reading, and p->sighand->siglock.
*/
-static int cpu_clock_sample_group_locked(unsigned int clock_idx,
- struct task_struct *p,
- union cpu_time_count *cpu)
+static int cpu_clock_sample_group(const clockid_t which_clock,
+ struct task_struct *p,
+ union cpu_time_count *cpu)
{
- struct task_struct *t = p;
- switch (clock_idx) {
+ struct task_cputime cputime;
+
+ thread_group_cputime(p, &cputime);
+ switch (which_clock) {
default:
return -EINVAL;
case CPUCLOCK_PROF:
- cpu->cpu = cputime_add(p->signal->utime, p->signal->stime);
- do {
- cpu->cpu = cputime_add(cpu->cpu, prof_ticks(t));
- t = next_thread(t);
- } while (t != p);
+ cpu->cpu = cputime_add(cputime.utime, cputime.stime);
break;
case CPUCLOCK_VIRT:
- cpu->cpu = p->signal->utime;
- do {
- cpu->cpu = cputime_add(cpu->cpu, virt_ticks(t));
- t = next_thread(t);
- } while (t != p);
+ cpu->cpu = cputime.utime;
break;
case CPUCLOCK_SCHED:
- cpu->sched = p->signal->sum_sched_runtime;
- /* Add in each other live thread. */
- while ((t = next_thread(t)) != p) {
- cpu->sched += t->se.sum_exec_runtime;
- }
- cpu->sched += sched_ns(p);
+ cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p);
break;
}
return 0;
}
-/*
- * Sample a process (thread group) clock for the given group_leader task.
- * Must be called with tasklist_lock held for reading.
- */
-static int cpu_clock_sample_group(const clockid_t which_clock,
- struct task_struct *p,
- union cpu_time_count *cpu)
-{
- int ret;
- unsigned long flags;
- spin_lock_irqsave(&p->sighand->siglock, flags);
- ret = cpu_clock_sample_group_locked(CPUCLOCK_WHICH(which_clock), p,
- cpu);
- spin_unlock_irqrestore(&p->sighand->siglock, flags);
- return ret;
-}
-
int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
{
@@ -471,80 +525,11 @@ void posix_cpu_timers_exit(struct task_struct *tsk)
}
void posix_cpu_timers_exit_group(struct task_struct *tsk)
{
- cleanup_timers(tsk->signal->cpu_timers,
- cputime_add(tsk->utime, tsk->signal->utime),
- cputime_add(tsk->stime, tsk->signal->stime),
- tsk->se.sum_exec_runtime + tsk->signal->sum_sched_runtime);
-}
+ struct task_cputime cputime;
-
-/*
- * Set the expiry times of all the threads in the process so one of them
- * will go off before the process cumulative expiry total is reached.
- */
-static void process_timer_rebalance(struct task_struct *p,
- unsigned int clock_idx,
- union cpu_time_count expires,
- union cpu_time_count val)
-{
- cputime_t ticks, left;
- unsigned long long ns, nsleft;
- struct task_struct *t = p;
- unsigned int nthreads = atomic_read(&p->signal->live);
-
- if (!nthreads)
- return;
-
- switch (clock_idx) {
- default:
- BUG();
- break;
- case CPUCLOCK_PROF:
- left = cputime_div_non_zero(cputime_sub(expires.cpu, val.cpu),
- nthreads);
- do {
- if (likely(!(t->flags & PF_EXITING))) {
- ticks = cputime_add(prof_ticks(t), left);
- if (cputime_eq(t->it_prof_expires,
- cputime_zero) ||
- cputime_gt(t->it_prof_expires, ticks)) {
- t->it_prof_expires = ticks;
- }
- }
- t = next_thread(t);
- } while (t != p);
- break;
- case CPUCLOCK_VIRT:
- left = cputime_div_non_zero(cputime_sub(expires.cpu, val.cpu),
- nthreads);
- do {
- if (likely(!(t->flags & PF_EXITING))) {
- ticks = cputime_add(virt_ticks(t), left);
- if (cputime_eq(t->it_virt_expires,
- cputime_zero) ||
- cputime_gt(t->it_virt_expires, ticks)) {
- t->it_virt_expires = ticks;
- }
- }
- t = next_thread(t);
- } while (t != p);
- break;
- case CPUCLOCK_SCHED:
- nsleft = expires.sched - val.sched;
- do_div(nsleft, nthreads);
- nsleft = max_t(unsigned long long, nsleft, 1);
- do {
- if (likely(!(t->flags & PF_EXITING))) {
- ns = t->se.sum_exec_runtime + nsleft;
- if (t->it_sched_expires == 0 ||
- t->it_sched_expires > ns) {
- t->it_sched_expires = ns;
- }
- }
- t = next_thread(t);
- } while (t != p);
- break;
- }
+ thread_group_cputime(tsk, &cputime);
+ cleanup_timers(tsk->signal->cpu_timers,
+ cputime.utime, cputime.stime, cputime.sum_exec_runtime);
}
static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now)
@@ -608,29 +593,32 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
default:
BUG();
case CPUCLOCK_PROF:
- if (cputime_eq(p->it_prof_expires,
+ if (cputime_eq(p->cputime_expires.prof_exp,
cputime_zero) ||
- cputime_gt(p->it_prof_expires,
+ cputime_gt(p->cputime_expires.prof_exp,
nt->expires.cpu))
- p->it_prof_expires = nt->expires.cpu;
+ p->cputime_expires.prof_exp =
+ nt->expires.cpu;
break;
case CPUCLOCK_VIRT:
- if (cputime_eq(p->it_virt_expires,
+ if (cputime_eq(p->cputime_expires.virt_exp,
cputime_zero) ||
- cputime_gt(p->it_virt_expires,
+ cputime_gt(p->cputime_expires.virt_exp,
nt->expires.cpu))
- p->it_virt_expires = nt->expires.cpu;
+ p->cputime_expires.virt_exp =
+ nt->expires.cpu;
break;
case CPUCLOCK_SCHED:
- if (p->it_sched_expires == 0 ||
- p->it_sched_expires > nt->expires.sched)
- p->it_sched_expires = nt->expires.sched;
+ if (p->cputime_expires.sched_exp == 0 ||
+ p->cputime_expires.sched_exp >
+ nt->expires.sched)
+ p->cputime_expires.sched_exp =
+ nt->expires.sched;
break;
}
} else {
/*
- * For a process timer, we must balance
- * all the live threads' expirations.
+ * For a process timer, set the cached expiration time.
*/
switch (CPUCLOCK_WHICH(timer->it_clock)) {
default:
@@ -641,7 +629,9 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
cputime_lt(p->signal->it_virt_expires,
timer->it.cpu.expires.cpu))
break;
- goto rebalance;
+ p->signal->cputime_expires.virt_exp =
+ timer->it.cpu.expires.cpu;
+ break;
case CPUCLOCK_PROF:
if (!cputime_eq(p->signal->it_prof_expires,
cputime_zero) &&
@@ -652,13 +642,12 @@ static void arm_timer(struct k_itimer *timer, union cpu_time_count now)
if (i != RLIM_INFINITY &&
i <= cputime_to_secs(timer->it.cpu.expires.cpu))
break;
- goto rebalance;
+ p->signal->cputime_expires.prof_exp =
+ timer->it.cpu.expires.cpu;
+ break;
case CPUCLOCK_SCHED:
- rebalance:
- process_timer_rebalance(
- timer->it.cpu.task,
- CPUCLOCK_WHICH(timer->it_clock),
- timer->it.cpu.expires, now);
+ p->signal->cputime_expires.sched_exp =
+ timer->it.cpu.expires.sched;
break;
}
}
@@ -969,13 +958,13 @@ static void check_thread_timers(struct task_struct *tsk,
struct signal_struct *const sig = tsk->signal;
maxfire = 20;
- tsk->it_prof_expires = cputime_zero;
+ tsk->cputime_expires.prof_exp = cputime_zero;
while (!list_empty(timers)) {
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
if (!--maxfire || cputime_lt(prof_ticks(tsk), t->expires.cpu)) {
- tsk->it_prof_expires = t->expires.cpu;
+ tsk->cputime_expires.prof_exp = t->expires.cpu;
break;
}
t->firing = 1;
@@ -984,13 +973,13 @@ static void check_thread_timers(struct task_struct *tsk,
++timers;
maxfire = 20;
- tsk->it_virt_expires = cputime_zero;
+ tsk->cputime_expires.virt_exp = cputime_zero;
while (!list_empty(timers)) {
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
if (!--maxfire || cputime_lt(virt_ticks(tsk), t->expires.cpu)) {
- tsk->it_virt_expires = t->expires.cpu;
+ tsk->cputime_expires.virt_exp = t->expires.cpu;
break;
}
t->firing = 1;
@@ -999,13 +988,13 @@ static void check_thread_timers(struct task_struct *tsk,
++timers;
maxfire = 20;
- tsk->it_sched_expires = 0;
+ tsk->cputime_expires.sched_exp = 0;
while (!list_empty(timers)) {
struct cpu_timer_list *t = list_first_entry(timers,
struct cpu_timer_list,
entry);
if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) {
- tsk->it_sched_expires = t->expires.sched;
+ tsk->cputime_expires.sched_exp = t->expires.sched;
break;
}
t->firing = 1;
@@ -1055,10 +1044,10 @@ static void check_process_timers(struct task_struct *tsk,
{
int maxfire;
struct signal_struct *const sig = tsk->signal;
- cputime_t utime, stime, ptime, virt_expires, prof_expires;
+ cputime_t utime, ptime, virt_expires, prof_expires;
unsigned long long sum_sched_runtime, sched_expires;
- struct task_struct *t;
struct list_head *timers = sig->cpu_timers;
+ struct task_cputime cputime;
/*
* Don't sample the current process CPU clocks if there are no timers.
@@ -1074,18 +1063,10 @@ static void check_process_timers(struct task_struct *tsk,
/*
* Collect the current process totals.
*/
- utime = sig->utime;
- stime = sig->stime;
- sum_sched_runtime = sig->sum_sched_runtime;
- t = tsk;
- do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- sum_sched_runtime += t->se.sum_exec_runtime;
- t = next_thread(t);
- } while (t != tsk);
- ptime = cputime_add(utime, stime);
-
+ thread_group_cputime(tsk, &cputime);
+ utime = cputime.utime;
+ ptime = cputime_add(utime, cputime.stime);
+ sum_sched_runtime = cputime.sum_exec_runtime;
maxfire = 20;
prof_expires = cputime_zero;
while (!list_empty(timers)) {
@@ -1193,60 +1174,18 @@ static void check_process_timers(struct task_struct *tsk,
}
}
- if (!cputime_eq(prof_expires, cputime_zero) ||
- !cputime_eq(virt_expires, cputime_zero) ||
- sched_expires != 0) {
- /*
- * Rebalance the threads' expiry times for the remaining
- * process CPU timers.
- */
-
- cputime_t prof_left, virt_left, ticks;
- unsigned long long sched_left, sched;
- const unsigned int nthreads = atomic_read(&sig->live);
-
- if (!nthreads)
- return;
-
- prof_left = cputime_sub(prof_expires, utime);
- prof_left = cputime_sub(prof_left, stime);
- prof_left = cputime_div_non_zero(prof_left, nthreads);
- virt_left = cputime_sub(virt_expires, utime);
- virt_left = cputime_div_non_zero(virt_left, nthreads);
- if (sched_expires) {
- sched_left = sched_expires - sum_sched_runtime;
- do_div(sched_left, nthreads);
- sched_left = max_t(unsigned long long, sched_left, 1);
- } else {
- sched_left = 0;
- }
- t = tsk;
- do {
- if (unlikely(t->flags & PF_EXITING))
- continue;
-
- ticks = cputime_add(cputime_add(t->utime, t->stime),
- prof_left);
- if (!cputime_eq(prof_expires, cputime_zero) &&
- (cputime_eq(t->it_prof_expires, cputime_zero) ||
- cputime_gt(t->it_prof_expires, ticks))) {
- t->it_prof_expires = ticks;
- }
-
- ticks = cputime_add(t->utime, virt_left);
- if (!cputime_eq(virt_expires, cputime_zero) &&
- (cputime_eq(t->it_virt_expires, cputime_zero) ||
- cputime_gt(t->it_virt_expires, ticks))) {
- t->it_virt_expires = ticks;
- }
-
- sched = t->se.sum_exec_runtime + sched_left;
- if (sched_expires && (t->it_sched_expires == 0 ||
- t->it_sched_expires > sched)) {
- t->it_sched_expires = sched;
- }
- } while ((t = next_thread(t)) != tsk);
- }
+ if (!cputime_eq(prof_expires, cputime_zero) &&
+ (cputime_eq(sig->cputime_expires.prof_exp, cputime_zero) ||
+ cputime_gt(sig->cputime_expires.prof_exp, prof_expires)))
+ sig->cputime_expires.prof_exp = prof_expires;
+ if (!cputime_eq(virt_expires, cputime_zero) &&
+ (cputime_eq(sig->cputime_expires.virt_exp, cputime_zero) ||
+ cputime_gt(sig->cputime_expires.virt_exp, virt_expires)))
+ sig->cputime_expires.virt_exp = virt_expires;
+ if (sched_expires != 0 &&
+ (sig->cputime_expires.sched_exp == 0 ||
+ sig->cputime_expires.sched_exp > sched_expires))
+ sig->cputime_expires.sched_exp = sched_expires;
}
/*
@@ -1314,6 +1253,86 @@ out:
++timer->it_requeue_pending;
}
+/**
+ * task_cputime_zero - Check a task_cputime struct for all zero fields.
+ *
+ * @cputime: The struct to compare.
+ *
+ * Checks @cputime to see if all fields are zero. Returns true if all fields
+ * are zero, false if any field is nonzero.
+ */
+static inline int task_cputime_zero(const struct task_cputime *cputime)
+{
+ if (cputime_eq(cputime->utime, cputime_zero) &&
+ cputime_eq(cputime->stime, cputime_zero) &&
+ cputime->sum_exec_runtime == 0)
+ return 1;
+ return 0;
+}
+
+/**
+ * task_cputime_expired - Compare two task_cputime entities.
+ *
+ * @sample: The task_cputime structure to be checked for expiration.
+ * @expires: Expiration times, against which @sample will be checked.
+ *
+ * Checks @sample against @expires to see if any field of @sample has expired.
+ * Returns true if any field of the former is greater than the corresponding
+ * field of the latter if the latter field is set. Otherwise returns false.
+ */
+static inline int task_cputime_expired(const struct task_cputime *sample,
+ const struct task_cputime *expires)
+{
+ if (!cputime_eq(expires->utime, cputime_zero) &&
+ cputime_ge(sample->utime, expires->utime))
+ return 1;
+ if (!cputime_eq(expires->stime, cputime_zero) &&
+ cputime_ge(cputime_add(sample->utime, sample->stime),
+ expires->stime))
+ return 1;
+ if (expires->sum_exec_runtime != 0 &&
+ sample->sum_exec_runtime >= expires->sum_exec_runtime)
+ return 1;
+ return 0;
+}
+
+/**
+ * fastpath_timer_check - POSIX CPU timers fast path.
+ *
+ * @tsk: The task (thread) being checked.
+ *
+ * Check the task and thread group timers. If both are zero (there are no
+ * timers set) return false. Otherwise snapshot the task and thread group
+ * timers and compare them with the corresponding expiration times. Return
+ * true if a timer has expired, else return false.
+ */
+static inline int fastpath_timer_check(struct task_struct *tsk)
+{
+ struct signal_struct *sig = tsk->signal;
+
+ if (unlikely(!sig))
+ return 0;
+
+ if (!task_cputime_zero(&tsk->cputime_expires)) {
+ struct task_cputime task_sample = {
+ .utime = tsk->utime,
+ .stime = tsk->stime,
+ .sum_exec_runtime = tsk->se.sum_exec_runtime
+ };
+
+ if (task_cputime_expired(&task_sample, &tsk->cputime_expires))
+ return 1;
+ }
+ if (!task_cputime_zero(&sig->cputime_expires)) {
+ struct task_cputime group_sample;
+
+ thread_group_cputime(tsk, &group_sample);
+ if (task_cputime_expired(&group_sample, &sig->cputime_expires))
+ return 1;
+ }
+ return 0;
+}
+
/*
* This is called from the timer interrupt handler. The irq handler has
* already updated our counts. We need to check if any timers fire now.
@@ -1326,42 +1345,31 @@ void run_posix_cpu_timers(struct task_struct *tsk)
BUG_ON(!irqs_disabled());
-#define UNEXPIRED(clock) \
- (cputime_eq(tsk->it_##clock##_expires, cputime_zero) || \
- cputime_lt(clock##_ticks(tsk), tsk->it_##clock##_expires))
-
- if (UNEXPIRED(prof) && UNEXPIRED(virt) &&
- (tsk->it_sched_expires == 0 ||
- tsk->se.sum_exec_runtime < tsk->it_sched_expires))
+ /*
+ * The fast path checks that there are no expired thread or thread
+ * group timers. If that's so, just return.
+ */
+ if (!fastpath_timer_check(tsk))
return;
-#undef UNEXPIRED
-
+ spin_lock(&tsk->sighand->siglock);
/*
- * Double-check with locks held.
+ * Here we take off tsk->signal->cpu_timers[N] and
+ * tsk->cpu_timers[N] all the timers that are firing, and
+ * put them on the firing list.
*/
- read_lock(&tasklist_lock);
- if (likely(tsk->signal != NULL)) {
- spin_lock(&tsk->sighand->siglock);
+ check_thread_timers(tsk, &firing);
+ check_process_timers(tsk, &firing);
- /*
- * Here we take off tsk->cpu_timers[N] and tsk->signal->cpu_timers[N]
- * all the timers that are firing, and put them on the firing list.
- */
- check_thread_timers(tsk, &firing);
- check_process_timers(tsk, &firing);
-
- /*
- * We must release these locks before taking any timer's lock.
- * There is a potential race with timer deletion here, as the
- * siglock now protects our private firing list. We have set
- * the firing flag in each timer, so that a deletion attempt
- * that gets the timer lock before we do will give it up and
- * spin until we've taken care of that timer below.
- */
- spin_unlock(&tsk->sighand->siglock);
- }
- read_unlock(&tasklist_lock);
+ /*
+ * We must release these locks before taking any timer's lock.
+ * There is a potential race with timer deletion here, as the
+ * siglock now protects our private firing list. We have set
+ * the firing flag in each timer, so that a deletion attempt
+ * that gets the timer lock before we do will give it up and
+ * spin until we've taken care of that timer below.
+ */
+ spin_unlock(&tsk->sighand->siglock);
/*
* Now that all the timers on our list have the firing flag,
@@ -1389,10 +1397,9 @@ void run_posix_cpu_timers(struct task_struct *tsk)
/*
* Set one of the process-wide special case CPU timers.
- * The tasklist_lock and tsk->sighand->siglock must be held by the caller.
- * The oldval argument is null for the RLIMIT_CPU timer, where *newval is
- * absolute; non-null for ITIMER_*, where *newval is relative and we update
- * it to be absolute, *oldval is absolute and we update it to be relative.
+ * The tsk->sighand->siglock must be held by the caller.
+ * The *newval argument is relative and we update it to be absolute, *oldval
+ * is absolute and we update it to be relative.
*/
void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
cputime_t *newval, cputime_t *oldval)
@@ -1401,7 +1408,7 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
struct list_head *head;
BUG_ON(clock_idx == CPUCLOCK_SCHED);
- cpu_clock_sample_group_locked(clock_idx, tsk, &now);
+ cpu_clock_sample_group(clock_idx, tsk, &now);
if (oldval) {
if (!cputime_eq(*oldval, cputime_zero)) {
@@ -1435,13 +1442,14 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
cputime_ge(list_first_entry(head,
struct cpu_timer_list, entry)->expires.cpu,
*newval)) {
- /*
- * Rejigger each thread's expiry time so that one will
- * notice before we hit the process-cumulative expiry time.
- */
- union cpu_time_count expires = { .sched = 0 };
- expires.cpu = *newval;
- process_timer_rebalance(tsk, clock_idx, expires, now);
+ switch (clock_idx) {
+ case CPUCLOCK_PROF:
+ tsk->signal->cputime_expires.prof_exp = *newval;
+ break;
+ case CPUCLOCK_VIRT:
+ tsk->signal->cputime_expires.virt_exp = *newval;
+ break;
+ }
}
}
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 5131e547116..b931d7cedbf 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -223,6 +223,15 @@ static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
}
/*
+ * Get monotonic time for posix timers
+ */
+static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
+{
+ getrawmonotonic(tp);
+ return 0;
+}
+
+/*
* Initialize everything, well, just everything in Posix clocks/timers ;)
*/
static __init int init_posix_timers(void)
@@ -235,9 +244,15 @@ static __init int init_posix_timers(void)
.clock_get = posix_ktime_get_ts,
.clock_set = do_posix_clock_nosettime,
};
+ struct k_clock clock_monotonic_raw = {
+ .clock_getres = hrtimer_get_res,
+ .clock_get = posix_get_monotonic_raw,
+ .clock_set = do_posix_clock_nosettime,
+ };
register_posix_clock(CLOCK_REALTIME, &clock_realtime);
register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
+ register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
posix_timers_cache = kmem_cache_create("posix_timers_cache",
sizeof (struct k_itimer), 0, SLAB_PANIC,
@@ -298,6 +313,7 @@ void do_schedule_next_timer(struct siginfo *info)
int posix_timer_event(struct k_itimer *timr, int si_private)
{
+ int shared, ret;
/*
* FIXME: if ->sigq is queued we can race with
* dequeue_signal()->do_schedule_next_timer().
@@ -311,25 +327,10 @@ int posix_timer_event(struct k_itimer *timr, int si_private)
*/
timr->sigq->info.si_sys_private = si_private;
- timr->sigq->info.si_signo = timr->it_sigev_signo;
- timr->sigq->info.si_code = SI_TIMER;
- timr->sigq->info.si_tid = timr->it_id;
- timr->sigq->info.si_value = timr->it_sigev_value;
-
- if (timr->it_sigev_notify & SIGEV_THREAD_ID) {
- struct task_struct *leader;
- int ret = send_sigqueue(timr->sigq, timr->it_process, 0);
-
- if (likely(ret >= 0))
- return ret;
-
- timr->it_sigev_notify = SIGEV_SIGNAL;
- leader = timr->it_process->group_leader;
- put_task_struct(timr->it_process);
- timr->it_process = leader;
- }
-
- return send_sigqueue(timr->sigq, timr->it_process, 1);
+ shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
+ ret = send_sigqueue(timr->sigq, timr->it_process, shared);
+ /* If we failed to send the signal the timer stops. */
+ return ret > 0;
}
EXPORT_SYMBOL_GPL(posix_timer_event);
@@ -468,11 +469,9 @@ sys_timer_create(const clockid_t which_clock,
struct sigevent __user *timer_event_spec,
timer_t __user * created_timer_id)
{
- int error = 0;
- struct k_itimer *new_timer = NULL;
- int new_timer_id;
- struct task_struct *process = NULL;
- unsigned long flags;
+ struct k_itimer *new_timer;
+ int error, new_timer_id;
+ struct task_struct *process;
sigevent_t event;
int it_id_set = IT_ID_NOT_SET;
@@ -490,12 +489,11 @@ sys_timer_create(const clockid_t which_clock,
goto out;
}
spin_lock_irq(&idr_lock);
- error = idr_get_new(&posix_timers_id, (void *) new_timer,
- &new_timer_id);
+ error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id);
spin_unlock_irq(&idr_lock);
- if (error == -EAGAIN)
- goto retry;
- else if (error) {
+ if (error) {
+ if (error == -EAGAIN)
+ goto retry;
/*
* Weird looking, but we return EAGAIN if the IDR is
* full (proper POSIX return value for this)
@@ -526,67 +524,43 @@ sys_timer_create(const clockid_t which_clock,
error = -EFAULT;
goto out;
}
- new_timer->it_sigev_notify = event.sigev_notify;
- new_timer->it_sigev_signo = event.sigev_signo;
- new_timer->it_sigev_value = event.sigev_value;
-
- read_lock(&tasklist_lock);
- if ((process = good_sigevent(&event))) {
- /*
- * We may be setting up this process for another
- * thread. It may be exiting. To catch this
- * case the we check the PF_EXITING flag. If
- * the flag is not set, the siglock will catch
- * him before it is too late (in exit_itimers).
- *
- * The exec case is a bit more invloved but easy
- * to code. If the process is in our thread
- * group (and it must be or we would not allow
- * it here) and is doing an exec, it will cause
- * us to be killed. In this case it will wait
- * for us to die which means we can finish this
- * linkage with our last gasp. I.e. no code :)
- */
- spin_lock_irqsave(&process->sighand->siglock, flags);
- if (!(process->flags & PF_EXITING)) {
- new_timer->it_process = process;
- list_add(&new_timer->list,
- &process->signal->posix_timers);
- if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- get_task_struct(process);
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
- } else {
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
- process = NULL;
- }
- }
- read_unlock(&tasklist_lock);
+ rcu_read_lock();
+ process = good_sigevent(&event);
+ if (process)
+ get_task_struct(process);
+ rcu_read_unlock();
if (!process) {
error = -EINVAL;
goto out;
}
} else {
- new_timer->it_sigev_notify = SIGEV_SIGNAL;
- new_timer->it_sigev_signo = SIGALRM;
- new_timer->it_sigev_value.sival_int = new_timer->it_id;
+ event.sigev_notify = SIGEV_SIGNAL;
+ event.sigev_signo = SIGALRM;
+ event.sigev_value.sival_int = new_timer->it_id;
process = current->group_leader;
- spin_lock_irqsave(&process->sighand->siglock, flags);
- new_timer->it_process = process;
- list_add(&new_timer->list, &process->signal->posix_timers);
- spin_unlock_irqrestore(&process->sighand->siglock, flags);
+ get_task_struct(process);
}
+ new_timer->it_sigev_notify = event.sigev_notify;
+ new_timer->sigq->info.si_signo = event.sigev_signo;
+ new_timer->sigq->info.si_value = event.sigev_value;
+ new_timer->sigq->info.si_tid = new_timer->it_id;
+ new_timer->sigq->info.si_code = SI_TIMER;
+
+ spin_lock_irq(&current->sighand->siglock);
+ new_timer->it_process = process;
+ list_add(&new_timer->list, &current->signal->posix_timers);
+ spin_unlock_irq(&current->sighand->siglock);
+
+ return 0;
/*
* In the case of the timer belonging to another task, after
* the task is unlocked, the timer is owned by the other task
* and may cease to exist at any time. Don't use or modify
* new_timer after the unlock call.
*/
-
out:
- if (error)
- release_posix_timer(new_timer, it_id_set);
-
+ release_posix_timer(new_timer, it_id_set);
return error;
}
@@ -597,7 +571,7 @@ out:
* the find to the timer lock. To avoid a dead lock, the timer id MUST
* be release with out holding the timer lock.
*/
-static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
+static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags)
{
struct k_itimer *timr;
/*
@@ -605,23 +579,20 @@ static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
* flags part over to the timer lock. Must not let interrupts in
* while we are moving the lock.
*/
-
spin_lock_irqsave(&idr_lock, *flags);
- timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id);
+ timr = idr_find(&posix_timers_id, (int)timer_id);
if (timr) {
spin_lock(&timr->it_lock);
-
- if ((timr->it_id != timer_id) || !(timr->it_process) ||
- !same_thread_group(timr->it_process, current)) {
- spin_unlock(&timr->it_lock);
- spin_unlock_irqrestore(&idr_lock, *flags);
- timr = NULL;
- } else
+ if (timr->it_process &&
+ same_thread_group(timr->it_process, current)) {
spin_unlock(&idr_lock);
- } else
- spin_unlock_irqrestore(&idr_lock, *flags);
+ return timr;
+ }
+ spin_unlock(&timr->it_lock);
+ }
+ spin_unlock_irqrestore(&idr_lock, *flags);
- return timr;
+ return NULL;
}
/*
@@ -862,8 +833,7 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- put_task_struct(timer->it_process);
+ put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
@@ -890,8 +860,7 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- put_task_struct(timer->it_process);
+ put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index bbd85c60f74..331f9836383 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -14,6 +14,7 @@
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
+#include <linux/kmod.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mount.h>
@@ -520,6 +521,10 @@ int hibernate(void)
if (error)
goto Exit;
+ error = usermodehelper_disable();
+ if (error)
+ goto Exit;
+
/* Allocate memory management structures */
error = create_basic_memory_bitmaps();
if (error)
@@ -558,6 +563,7 @@ int hibernate(void)
thaw_processes();
Finish:
free_basic_memory_bitmaps();
+ usermodehelper_enable();
Exit:
pm_notifier_call_chain(PM_POST_HIBERNATION);
pm_restore_console();
@@ -634,6 +640,10 @@ static int software_resume(void)
if (error)
goto Finish;
+ error = usermodehelper_disable();
+ if (error)
+ goto Finish;
+
error = create_basic_memory_bitmaps();
if (error)
goto Finish;
@@ -656,6 +666,7 @@ static int software_resume(void)
thaw_processes();
Done:
free_basic_memory_bitmaps();
+ usermodehelper_enable();
Finish:
pm_notifier_call_chain(PM_POST_RESTORE);
pm_restore_console();
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 540b16b6856..19122cf6d82 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -14,6 +14,7 @@
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
+#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/cpu.h>
@@ -237,6 +238,10 @@ static int suspend_prepare(void)
if (error)
goto Finish;
+ error = usermodehelper_disable();
+ if (error)
+ goto Finish;
+
if (suspend_freeze_processes()) {
error = -EAGAIN;
goto Thaw;
@@ -256,6 +261,7 @@ static int suspend_prepare(void)
Thaw:
suspend_thaw_processes();
+ usermodehelper_enable();
Finish:
pm_notifier_call_chain(PM_POST_SUSPEND);
pm_restore_console();
@@ -376,6 +382,7 @@ int suspend_devices_and_enter(suspend_state_t state)
static void suspend_finish(void)
{
suspend_thaw_processes();
+ usermodehelper_enable();
pm_notifier_call_chain(PM_POST_SUSPEND);
pm_restore_console();
}
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 278946aecaf..ca634019497 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -28,121 +28,6 @@ static inline int freezeable(struct task_struct * p)
return 1;
}
-/*
- * freezing is complete, mark current process as frozen
- */
-static inline void frozen_process(void)
-{
- if (!unlikely(current->flags & PF_NOFREEZE)) {
- current->flags |= PF_FROZEN;
- wmb();
- }
- clear_freeze_flag(current);
-}
-
-/* Refrigerator is place where frozen processes are stored :-). */
-void refrigerator(void)
-{
- /* Hmm, should we be allowed to suspend when there are realtime
- processes around? */
- long save;
-
- task_lock(current);
- if (freezing(current)) {
- frozen_process();
- task_unlock(current);
- } else {
- task_unlock(current);
- return;
- }
- save = current->state;
- pr_debug("%s entered refrigerator\n", current->comm);
-
- spin_lock_irq(&current->sighand->siglock);
- recalc_sigpending(); /* We sent fake signal, clean it up */
- spin_unlock_irq(&current->sighand->siglock);
-
- for (;;) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- if (!frozen(current))
- break;
- schedule();
- }
- pr_debug("%s left refrigerator\n", current->comm);
- __set_current_state(save);
-}
-
-static void fake_signal_wake_up(struct task_struct *p)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&p->sighand->siglock, flags);
- signal_wake_up(p, 0);
- spin_unlock_irqrestore(&p->sighand->siglock, flags);
-}
-
-static inline bool should_send_signal(struct task_struct *p)
-{
- return !(p->flags & PF_FREEZER_NOSIG);
-}
-
-/**
- * freeze_task - send a freeze request to given task
- * @p: task to send the request to
- * @sig_only: if set, the request will only be sent if the task has the
- * PF_FREEZER_NOSIG flag unset
- * Return value: 'false', if @sig_only is set and the task has
- * PF_FREEZER_NOSIG set or the task is frozen, 'true', otherwise
- *
- * The freeze request is sent by setting the tasks's TIF_FREEZE flag and
- * either sending a fake signal to it or waking it up, depending on whether
- * or not it has PF_FREEZER_NOSIG set. If @sig_only is set and the task
- * has PF_FREEZER_NOSIG set (ie. it is a typical kernel thread), its
- * TIF_FREEZE flag will not be set.
- */
-static bool freeze_task(struct task_struct *p, bool sig_only)
-{
- /*
- * We first check if the task is freezing and next if it has already
- * been frozen to avoid the race with frozen_process() which first marks
- * the task as frozen and next clears its TIF_FREEZE.
- */
- if (!freezing(p)) {
- rmb();
- if (frozen(p))
- return false;
-
- if (!sig_only || should_send_signal(p))
- set_freeze_flag(p);
- else
- return false;
- }
-
- if (should_send_signal(p)) {
- if (!signal_pending(p))
- fake_signal_wake_up(p);
- } else if (sig_only) {
- return false;
- } else {
- wake_up_state(p, TASK_INTERRUPTIBLE);
- }
-
- return true;
-}
-
-static void cancel_freezing(struct task_struct *p)
-{
- unsigned long flags;
-
- if (freezing(p)) {
- pr_debug(" clean up: %s\n", p->comm);
- clear_freeze_flag(p);
- spin_lock_irqsave(&p->sighand->siglock, flags);
- recalc_sigpending_and_wake(p);
- spin_unlock_irqrestore(&p->sighand->siglock, flags);
- }
-}
-
static int try_to_freeze_tasks(bool sig_only)
{
struct task_struct *g, *p;
@@ -250,6 +135,9 @@ static void thaw_tasks(bool nosig_only)
if (nosig_only && should_send_signal(p))
continue;
+ if (cgroup_frozen(p))
+ continue;
+
thaw_process(p);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
@@ -264,4 +152,3 @@ void thaw_processes(void)
printk("done.\n");
}
-EXPORT_SYMBOL(refrigerator);
diff --git a/kernel/power/user.c b/kernel/power/user.c
index a6332a31326..005b93d839b 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -212,13 +212,20 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
case SNAPSHOT_FREEZE:
if (data->frozen)
break;
+
printk("Syncing filesystems ... ");
sys_sync();
printk("done.\n");
- error = freeze_processes();
+ error = usermodehelper_disable();
if (error)
+ break;
+
+ error = freeze_processes();
+ if (error) {
thaw_processes();
+ usermodehelper_enable();
+ }
if (!error)
data->frozen = 1;
break;
@@ -227,6 +234,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
if (!data->frozen || data->ready)
break;
thaw_processes();
+ usermodehelper_enable();
data->frozen = 0;
break;
diff --git a/kernel/printk.c b/kernel/printk.c
index b51b1567bb5..6341af77eb6 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -13,7 +13,7 @@
* Fixed SMP synchronization, 08/08/99, Manfred Spraul
* manfred@colorfullife.com
* Rewrote bits to get rid of console_lock
- * 01Mar01 Andrew Morton <andrewm@uow.edu.au>
+ * 01Mar01 Andrew Morton
*/
#include <linux/kernel.h>
@@ -577,9 +577,6 @@ static int have_callable_console(void)
* @fmt: format string
*
* This is printk(). It can be called from any context. We want it to work.
- * Be aware of the fact that if oops_in_progress is not set, we might try to
- * wake klogd up which could deadlock on runqueue lock if printk() is called
- * from scheduler code.
*
* We try to grab the console_sem. If we succeed, it's easy - we log the output and
* call the console drivers. If we fail to get the semaphore we place the output
@@ -593,6 +590,8 @@ static int have_callable_console(void)
*
* See also:
* printf(3)
+ *
+ * See the vsnprintf() documentation for format string extensions over C99.
*/
asmlinkage int printk(const char *fmt, ...)
@@ -982,10 +981,25 @@ int is_console_locked(void)
return console_locked;
}
-void wake_up_klogd(void)
+static DEFINE_PER_CPU(int, printk_pending);
+
+void printk_tick(void)
{
- if (!oops_in_progress && waitqueue_active(&log_wait))
+ if (__get_cpu_var(printk_pending)) {
+ __get_cpu_var(printk_pending) = 0;
wake_up_interruptible(&log_wait);
+ }
+}
+
+int printk_needs_cpu(int cpu)
+{
+ return per_cpu(printk_pending, cpu);
+}
+
+void wake_up_klogd(void)
+{
+ if (waitqueue_active(&log_wait))
+ __raw_get_cpu_var(printk_pending) = 1;
}
/**
@@ -1291,22 +1305,6 @@ static int __init disable_boot_consoles(void)
}
late_initcall(disable_boot_consoles);
-/**
- * tty_write_message - write a message to a certain tty, not just the console.
- * @tty: the destination tty_struct
- * @msg: the message to write
- *
- * This is used for messages that need to be redirected to a specific tty.
- * We don't put it into the syslog queue right now maybe in the future if
- * really needed.
- */
-void tty_write_message(struct tty_struct *tty, char *msg)
-{
- if (tty && tty->ops->write)
- tty->ops->write(tty, msg, strlen(msg));
- return;
-}
-
#if defined CONFIG_PRINTK
/*
diff --git a/kernel/profile.c b/kernel/profile.c
index cd26bed4cc2..a9e422df6bf 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -22,6 +22,8 @@
#include <linux/cpu.h>
#include <linux/highmem.h>
#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
#include <asm/sections.h>
#include <asm/irq_regs.h>
#include <asm/ptrace.h>
@@ -50,11 +52,11 @@ static DEFINE_PER_CPU(int, cpu_profile_flip);
static DEFINE_MUTEX(profile_flip_mutex);
#endif /* CONFIG_SMP */
-static int __init profile_setup(char *str)
+int profile_setup(char *str)
{
- static char __initdata schedstr[] = "schedule";
- static char __initdata sleepstr[] = "sleep";
- static char __initdata kvmstr[] = "kvm";
+ static char schedstr[] = "schedule";
+ static char sleepstr[] = "sleep";
+ static char kvmstr[] = "kvm";
int par;
if (!strncmp(str, sleepstr, strlen(sleepstr))) {
@@ -100,14 +102,33 @@ static int __init profile_setup(char *str)
__setup("profile=", profile_setup);
-void __init profile_init(void)
+int profile_init(void)
{
+ int buffer_bytes;
if (!prof_on)
- return;
+ return 0;
/* only text is profiled */
prof_len = (_etext - _stext) >> prof_shift;
- prof_buffer = alloc_bootmem(prof_len*sizeof(atomic_t));
+ buffer_bytes = prof_len*sizeof(atomic_t);
+ if (!slab_is_available()) {
+ prof_buffer = alloc_bootmem(buffer_bytes);
+ return 0;
+ }
+
+ prof_buffer = kzalloc(buffer_bytes, GFP_KERNEL);
+ if (prof_buffer)
+ return 0;
+
+ prof_buffer = alloc_pages_exact(buffer_bytes, GFP_KERNEL|__GFP_ZERO);
+ if (prof_buffer)
+ return 0;
+
+ prof_buffer = vmalloc(buffer_bytes);
+ if (prof_buffer)
+ return 0;
+
+ return -ENOMEM;
}
/* Profile event notifications */
@@ -527,7 +548,7 @@ static void __init profile_nop(void *unused)
{
}
-static int __init create_hash_tables(void)
+static int create_hash_tables(void)
{
int cpu;
@@ -575,14 +596,14 @@ out_cleanup:
#define create_hash_tables() ({ 0; })
#endif
-static int __init create_proc_profile(void)
+int create_proc_profile(void)
{
struct proc_dir_entry *entry;
if (!prof_on)
return 0;
if (create_hash_tables())
- return -1;
+ return -ENOMEM;
entry = proc_create("profile", S_IWUSR | S_IRUGO,
NULL, &proc_profile_operations);
if (!entry)
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 356699a96d5..1e68e4c39e2 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -45,7 +45,7 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent)
* TASK_TRACED, resume it now.
* Requires that irqs be disabled.
*/
-void ptrace_untrace(struct task_struct *child)
+static void ptrace_untrace(struct task_struct *child)
{
spin_lock(&child->sighand->siglock);
if (task_is_traced(child)) {
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index aad93cdc9f6..37f72e55154 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -47,6 +47,7 @@
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/mutex.h>
+#include <linux/time.h>
#ifdef CONFIG_DEBUG_LOCK_ALLOC
static struct lock_class_key rcu_lock_key;
@@ -60,12 +61,14 @@ EXPORT_SYMBOL_GPL(rcu_lock_map);
static struct rcu_ctrlblk rcu_ctrlblk = {
.cur = -300,
.completed = -300,
+ .pending = -300,
.lock = __SPIN_LOCK_UNLOCKED(&rcu_ctrlblk.lock),
.cpumask = CPU_MASK_NONE,
};
static struct rcu_ctrlblk rcu_bh_ctrlblk = {
.cur = -300,
.completed = -300,
+ .pending = -300,
.lock = __SPIN_LOCK_UNLOCKED(&rcu_bh_ctrlblk.lock),
.cpumask = CPU_MASK_NONE,
};
@@ -83,7 +86,10 @@ static void force_quiescent_state(struct rcu_data *rdp,
{
int cpu;
cpumask_t cpumask;
+ unsigned long flags;
+
set_need_resched();
+ spin_lock_irqsave(&rcp->lock, flags);
if (unlikely(!rcp->signaled)) {
rcp->signaled = 1;
/*
@@ -109,6 +115,7 @@ static void force_quiescent_state(struct rcu_data *rdp,
for_each_cpu_mask_nr(cpu, cpumask)
smp_send_reschedule(cpu);
}
+ spin_unlock_irqrestore(&rcp->lock, flags);
}
#else
static inline void force_quiescent_state(struct rcu_data *rdp,
@@ -118,6 +125,126 @@ static inline void force_quiescent_state(struct rcu_data *rdp,
}
#endif
+static void __call_rcu(struct rcu_head *head, struct rcu_ctrlblk *rcp,
+ struct rcu_data *rdp)
+{
+ long batch;
+
+ head->next = NULL;
+ smp_mb(); /* Read of rcu->cur must happen after any change by caller. */
+
+ /*
+ * Determine the batch number of this callback.
+ *
+ * Using ACCESS_ONCE to avoid the following error when gcc eliminates
+ * local variable "batch" and emits codes like this:
+ * 1) rdp->batch = rcp->cur + 1 # gets old value
+ * ......
+ * 2)rcu_batch_after(rcp->cur + 1, rdp->batch) # gets new value
+ * then [*nxttail[0], *nxttail[1]) may contain callbacks
+ * that batch# = rdp->batch, see the comment of struct rcu_data.
+ */
+ batch = ACCESS_ONCE(rcp->cur) + 1;
+
+ if (rdp->nxtlist && rcu_batch_after(batch, rdp->batch)) {
+ /* process callbacks */
+ rdp->nxttail[0] = rdp->nxttail[1];
+ rdp->nxttail[1] = rdp->nxttail[2];
+ if (rcu_batch_after(batch - 1, rdp->batch))
+ rdp->nxttail[0] = rdp->nxttail[2];
+ }
+
+ rdp->batch = batch;
+ *rdp->nxttail[2] = head;
+ rdp->nxttail[2] = &head->next;
+
+ if (unlikely(++rdp->qlen > qhimark)) {
+ rdp->blimit = INT_MAX;
+ force_quiescent_state(rdp, &rcu_ctrlblk);
+ }
+}
+
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
+
+static void record_gp_stall_check_time(struct rcu_ctrlblk *rcp)
+{
+ rcp->gp_start = jiffies;
+ rcp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_CHECK;
+}
+
+static void print_other_cpu_stall(struct rcu_ctrlblk *rcp)
+{
+ int cpu;
+ long delta;
+ unsigned long flags;
+
+ /* Only let one CPU complain about others per time interval. */
+
+ spin_lock_irqsave(&rcp->lock, flags);
+ delta = jiffies - rcp->jiffies_stall;
+ if (delta < 2 || rcp->cur != rcp->completed) {
+ spin_unlock_irqrestore(&rcp->lock, flags);
+ return;
+ }
+ rcp->jiffies_stall = jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
+ spin_unlock_irqrestore(&rcp->lock, flags);
+
+ /* OK, time to rat on our buddy... */
+
+ printk(KERN_ERR "RCU detected CPU stalls:");
+ for_each_possible_cpu(cpu) {
+ if (cpu_isset(cpu, rcp->cpumask))
+ printk(" %d", cpu);
+ }
+ printk(" (detected by %d, t=%ld jiffies)\n",
+ smp_processor_id(), (long)(jiffies - rcp->gp_start));
+}
+
+static void print_cpu_stall(struct rcu_ctrlblk *rcp)
+{
+ unsigned long flags;
+
+ printk(KERN_ERR "RCU detected CPU %d stall (t=%lu/%lu jiffies)\n",
+ smp_processor_id(), jiffies,
+ jiffies - rcp->gp_start);
+ dump_stack();
+ spin_lock_irqsave(&rcp->lock, flags);
+ if ((long)(jiffies - rcp->jiffies_stall) >= 0)
+ rcp->jiffies_stall =
+ jiffies + RCU_SECONDS_TILL_STALL_RECHECK;
+ spin_unlock_irqrestore(&rcp->lock, flags);
+ set_need_resched(); /* kick ourselves to get things going. */
+}
+
+static void check_cpu_stall(struct rcu_ctrlblk *rcp)
+{
+ long delta;
+
+ delta = jiffies - rcp->jiffies_stall;
+ if (cpu_isset(smp_processor_id(), rcp->cpumask) && delta >= 0) {
+
+ /* We haven't checked in, so go dump stack. */
+ print_cpu_stall(rcp);
+
+ } else if (rcp->cur != rcp->completed && delta >= 2) {
+
+ /* They had two seconds to dump stack, so complain. */
+ print_other_cpu_stall(rcp);
+ }
+}
+
+#else /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+
+static void record_gp_stall_check_time(struct rcu_ctrlblk *rcp)
+{
+}
+
+static inline void check_cpu_stall(struct rcu_ctrlblk *rcp)
+{
+}
+
+#endif /* #else #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
+
/**
* call_rcu - Queue an RCU callback for invocation after a grace period.
* @head: structure to be used for queueing the RCU updates.
@@ -133,18 +260,10 @@ void call_rcu(struct rcu_head *head,
void (*func)(struct rcu_head *rcu))
{
unsigned long flags;
- struct rcu_data *rdp;
head->func = func;
- head->next = NULL;
local_irq_save(flags);
- rdp = &__get_cpu_var(rcu_data);
- *rdp->nxttail = head;
- rdp->nxttail = &head->next;
- if (unlikely(++rdp->qlen > qhimark)) {
- rdp->blimit = INT_MAX;
- force_quiescent_state(rdp, &rcu_ctrlblk);
- }
+ __call_rcu(head, &rcu_ctrlblk, &__get_cpu_var(rcu_data));
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(call_rcu);
@@ -169,20 +288,10 @@ void call_rcu_bh(struct rcu_head *head,
void (*func)(struct rcu_head *rcu))
{
unsigned long flags;
- struct rcu_data *rdp;
head->func = func;
- head->next = NULL;
local_irq_save(flags);
- rdp = &__get_cpu_var(rcu_bh_data);
- *rdp->nxttail = head;
- rdp->nxttail = &head->next;
-
- if (unlikely(++rdp->qlen > qhimark)) {
- rdp->blimit = INT_MAX;
- force_quiescent_state(rdp, &rcu_bh_ctrlblk);
- }
-
+ __call_rcu(head, &rcu_bh_ctrlblk, &__get_cpu_var(rcu_bh_data));
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(call_rcu_bh);
@@ -211,12 +320,6 @@ EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
static inline void raise_rcu_softirq(void)
{
raise_softirq(RCU_SOFTIRQ);
- /*
- * The smp_mb() here is required to ensure that this cpu's
- * __rcu_process_callbacks() reads the most recently updated
- * value of rcu->cur.
- */
- smp_mb();
}
/*
@@ -225,6 +328,7 @@ static inline void raise_rcu_softirq(void)
*/
static void rcu_do_batch(struct rcu_data *rdp)
{
+ unsigned long flags;
struct rcu_head *next, *list;
int count = 0;
@@ -239,9 +343,9 @@ static void rcu_do_batch(struct rcu_data *rdp)
}
rdp->donelist = list;
- local_irq_disable();
+ local_irq_save(flags);
rdp->qlen -= count;
- local_irq_enable();
+ local_irq_restore(flags);
if (rdp->blimit == INT_MAX && rdp->qlen <= qlowmark)
rdp->blimit = blimit;
@@ -269,6 +373,7 @@ static void rcu_do_batch(struct rcu_data *rdp)
* rcu_check_quiescent_state calls rcu_start_batch(0) to start the next grace
* period (if necessary).
*/
+
/*
* Register a new batch of callbacks, and start it up if there is currently no
* active batch and the batch to be registered has not already occurred.
@@ -276,15 +381,10 @@ static void rcu_do_batch(struct rcu_data *rdp)
*/
static void rcu_start_batch(struct rcu_ctrlblk *rcp)
{
- if (rcp->next_pending &&
+ if (rcp->cur != rcp->pending &&
rcp->completed == rcp->cur) {
- rcp->next_pending = 0;
- /*
- * next_pending == 0 must be visible in
- * __rcu_process_callbacks() before it can see new value of cur.
- */
- smp_wmb();
rcp->cur++;
+ record_gp_stall_check_time(rcp);
/*
* Accessing nohz_cpu_mask before incrementing rcp->cur needs a
@@ -322,6 +422,8 @@ static void cpu_quiet(int cpu, struct rcu_ctrlblk *rcp)
static void rcu_check_quiescent_state(struct rcu_ctrlblk *rcp,
struct rcu_data *rdp)
{
+ unsigned long flags;
+
if (rdp->quiescbatch != rcp->cur) {
/* start new grace period: */
rdp->qs_pending = 1;
@@ -345,7 +447,7 @@ static void rcu_check_quiescent_state(struct rcu_ctrlblk *rcp,
return;
rdp->qs_pending = 0;
- spin_lock(&rcp->lock);
+ spin_lock_irqsave(&rcp->lock, flags);
/*
* rdp->quiescbatch/rcp->cur and the cpu bitmap can come out of sync
* during cpu startup. Ignore the quiescent state.
@@ -353,7 +455,7 @@ static void rcu_check_quiescent_state(struct rcu_ctrlblk *rcp,
if (likely(rdp->quiescbatch == rcp->cur))
cpu_quiet(rdp->cpu, rcp);
- spin_unlock(&rcp->lock);
+ spin_unlock_irqrestore(&rcp->lock, flags);
}
@@ -364,33 +466,38 @@ static void rcu_check_quiescent_state(struct rcu_ctrlblk *rcp,
* which is dead and hence not processing interrupts.
*/
static void rcu_move_batch(struct rcu_data *this_rdp, struct rcu_head *list,
- struct rcu_head **tail)
+ struct rcu_head **tail, long batch)
{
- local_irq_disable();
- *this_rdp->nxttail = list;
- if (list)
- this_rdp->nxttail = tail;
- local_irq_enable();
+ unsigned long flags;
+
+ if (list) {
+ local_irq_save(flags);
+ this_rdp->batch = batch;
+ *this_rdp->nxttail[2] = list;
+ this_rdp->nxttail[2] = tail;
+ local_irq_restore(flags);
+ }
}
static void __rcu_offline_cpu(struct rcu_data *this_rdp,
struct rcu_ctrlblk *rcp, struct rcu_data *rdp)
{
- /* if the cpu going offline owns the grace period
+ unsigned long flags;
+
+ /*
+ * if the cpu going offline owns the grace period
* we can block indefinitely waiting for it, so flush
* it here
*/
- spin_lock_bh(&rcp->lock);
+ spin_lock_irqsave(&rcp->lock, flags);
if (rcp->cur != rcp->completed)
cpu_quiet(rdp->cpu, rcp);
- spin_unlock_bh(&rcp->lock);
- rcu_move_batch(this_rdp, rdp->donelist, rdp->donetail);
- rcu_move_batch(this_rdp, rdp->curlist, rdp->curtail);
- rcu_move_batch(this_rdp, rdp->nxtlist, rdp->nxttail);
+ rcu_move_batch(this_rdp, rdp->donelist, rdp->donetail, rcp->cur + 1);
+ rcu_move_batch(this_rdp, rdp->nxtlist, rdp->nxttail[2], rcp->cur + 1);
+ spin_unlock(&rcp->lock);
- local_irq_disable();
this_rdp->qlen += rdp->qlen;
- local_irq_enable();
+ local_irq_restore(flags);
}
static void rcu_offline_cpu(int cpu)
@@ -420,38 +527,52 @@ static void rcu_offline_cpu(int cpu)
static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp,
struct rcu_data *rdp)
{
- if (rdp->curlist && !rcu_batch_before(rcp->completed, rdp->batch)) {
- *rdp->donetail = rdp->curlist;
- rdp->donetail = rdp->curtail;
- rdp->curlist = NULL;
- rdp->curtail = &rdp->curlist;
- }
+ unsigned long flags;
+ long completed_snap;
- if (rdp->nxtlist && !rdp->curlist) {
- local_irq_disable();
- rdp->curlist = rdp->nxtlist;
- rdp->curtail = rdp->nxttail;
- rdp->nxtlist = NULL;
- rdp->nxttail = &rdp->nxtlist;
- local_irq_enable();
+ if (rdp->nxtlist) {
+ local_irq_save(flags);
+ completed_snap = ACCESS_ONCE(rcp->completed);
/*
- * start the next batch of callbacks
+ * move the other grace-period-completed entries to
+ * [rdp->nxtlist, *rdp->nxttail[0]) temporarily
*/
+ if (!rcu_batch_before(completed_snap, rdp->batch))
+ rdp->nxttail[0] = rdp->nxttail[1] = rdp->nxttail[2];
+ else if (!rcu_batch_before(completed_snap, rdp->batch - 1))
+ rdp->nxttail[0] = rdp->nxttail[1];
- /* determine batch number */
- rdp->batch = rcp->cur + 1;
- /* see the comment and corresponding wmb() in
- * the rcu_start_batch()
+ /*
+ * the grace period for entries in
+ * [rdp->nxtlist, *rdp->nxttail[0]) has completed and
+ * move these entries to donelist
*/
- smp_rmb();
+ if (rdp->nxttail[0] != &rdp->nxtlist) {
+ *rdp->donetail = rdp->nxtlist;
+ rdp->donetail = rdp->nxttail[0];
+ rdp->nxtlist = *rdp->nxttail[0];
+ *rdp->donetail = NULL;
+
+ if (rdp->nxttail[1] == rdp->nxttail[0])
+ rdp->nxttail[1] = &rdp->nxtlist;
+ if (rdp->nxttail[2] == rdp->nxttail[0])
+ rdp->nxttail[2] = &rdp->nxtlist;
+ rdp->nxttail[0] = &rdp->nxtlist;
+ }
+
+ local_irq_restore(flags);
+
+ if (rcu_batch_after(rdp->batch, rcp->pending)) {
+ unsigned long flags2;
- if (!rcp->next_pending) {
/* and start it/schedule start if it's a new batch */
- spin_lock(&rcp->lock);
- rcp->next_pending = 1;
- rcu_start_batch(rcp);
- spin_unlock(&rcp->lock);
+ spin_lock_irqsave(&rcp->lock, flags2);
+ if (rcu_batch_after(rdp->batch, rcp->pending)) {
+ rcp->pending = rdp->batch;
+ rcu_start_batch(rcp);
+ }
+ spin_unlock_irqrestore(&rcp->lock, flags2);
}
}
@@ -462,21 +583,53 @@ static void __rcu_process_callbacks(struct rcu_ctrlblk *rcp,
static void rcu_process_callbacks(struct softirq_action *unused)
{
+ /*
+ * Memory references from any prior RCU read-side critical sections
+ * executed by the interrupted code must be see before any RCU
+ * grace-period manupulations below.
+ */
+
+ smp_mb(); /* See above block comment. */
+
__rcu_process_callbacks(&rcu_ctrlblk, &__get_cpu_var(rcu_data));
__rcu_process_callbacks(&rcu_bh_ctrlblk, &__get_cpu_var(rcu_bh_data));
+
+ /*
+ * Memory references from any later RCU read-side critical sections
+ * executed by the interrupted code must be see after any RCU
+ * grace-period manupulations above.
+ */
+
+ smp_mb(); /* See above block comment. */
}
static int __rcu_pending(struct rcu_ctrlblk *rcp, struct rcu_data *rdp)
{
- /* This cpu has pending rcu entries and the grace period
- * for them has completed.
- */
- if (rdp->curlist && !rcu_batch_before(rcp->completed, rdp->batch))
- return 1;
+ /* Check for CPU stalls, if enabled. */
+ check_cpu_stall(rcp);
- /* This cpu has no pending entries, but there are new entries */
- if (!rdp->curlist && rdp->nxtlist)
- return 1;
+ if (rdp->nxtlist) {
+ long completed_snap = ACCESS_ONCE(rcp->completed);
+
+ /*
+ * This cpu has pending rcu entries and the grace period
+ * for them has completed.
+ */
+ if (!rcu_batch_before(completed_snap, rdp->batch))
+ return 1;
+ if (!rcu_batch_before(completed_snap, rdp->batch - 1) &&
+ rdp->nxttail[0] != rdp->nxttail[1])
+ return 1;
+ if (rdp->nxttail[0] != &rdp->nxtlist)
+ return 1;
+
+ /*
+ * This cpu has pending rcu entries and the new batch
+ * for then hasn't been started nor scheduled start
+ */
+ if (rcu_batch_after(rdp->batch, rcp->pending))
+ return 1;
+ }
/* This cpu has finished callbacks to invoke */
if (rdp->donelist)
@@ -512,9 +665,15 @@ int rcu_needs_cpu(int cpu)
struct rcu_data *rdp = &per_cpu(rcu_data, cpu);
struct rcu_data *rdp_bh = &per_cpu(rcu_bh_data, cpu);
- return (!!rdp->curlist || !!rdp_bh->curlist || rcu_pending(cpu));
+ return !!rdp->nxtlist || !!rdp_bh->nxtlist || rcu_pending(cpu);
}
+/*
+ * Top-level function driving RCU grace-period detection, normally
+ * invoked from the scheduler-clock interrupt. This function simply
+ * increments counters that are read only from softirq by this same
+ * CPU, so there are no memory barriers required.
+ */
void rcu_check_callbacks(int cpu, int user)
{
if (user ||
@@ -558,14 +717,17 @@ void rcu_check_callbacks(int cpu, int user)
static void rcu_init_percpu_data(int cpu, struct rcu_ctrlblk *rcp,
struct rcu_data *rdp)
{
+ unsigned long flags;
+
+ spin_lock_irqsave(&rcp->lock, flags);
memset(rdp, 0, sizeof(*rdp));
- rdp->curtail = &rdp->curlist;
- rdp->nxttail = &rdp->nxtlist;
+ rdp->nxttail[0] = rdp->nxttail[1] = rdp->nxttail[2] = &rdp->nxtlist;
rdp->donetail = &rdp->donelist;
rdp->quiescbatch = rcp->completed;
rdp->qs_pending = 0;
rdp->cpu = cpu;
rdp->blimit = blimit;
+ spin_unlock_irqrestore(&rcp->lock, flags);
}
static void __cpuinit rcu_online_cpu(int cpu)
@@ -610,6 +772,9 @@ static struct notifier_block __cpuinitdata rcu_nb = {
*/
void __init __rcu_init(void)
{
+#ifdef CONFIG_RCU_CPU_STALL_DETECTOR
+ printk(KERN_INFO "RCU-based detection of stalled CPUs is enabled.\n");
+#endif /* #ifdef CONFIG_RCU_CPU_STALL_DETECTOR */
rcu_cpu_notify(&rcu_nb, CPU_UP_PREPARE,
(void *)(long)smp_processor_id());
/* Register notifier for non-boot CPUs */
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index 27827931ca0..59236e8b9da 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -54,17 +54,9 @@
#include <linux/cpu.h>
#include <linux/random.h>
#include <linux/delay.h>
-#include <linux/byteorder/swabb.h>
#include <linux/cpumask.h>
#include <linux/rcupreempt_trace.h>
-
-/*
- * Macro that prevents the compiler from reordering accesses, but does
- * absolutely -nothing- to prevent CPUs from reordering. This is used
- * only to mediate communication between mainline code and hardware
- * interrupt and NMI handlers.
- */
-#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
+#include <asm/byteorder.h>
/*
* PREEMPT_RCU data structures.
diff --git a/kernel/rcupreempt_trace.c b/kernel/rcupreempt_trace.c
index 5edf82c34bb..35c2d3360ec 100644
--- a/kernel/rcupreempt_trace.c
+++ b/kernel/rcupreempt_trace.c
@@ -308,11 +308,16 @@ out:
static int __init rcupreempt_trace_init(void)
{
+ int ret;
+
mutex_init(&rcupreempt_trace_mutex);
rcupreempt_trace_buf = kmalloc(RCUPREEMPT_TRACE_BUF_SIZE, GFP_KERNEL);
if (!rcupreempt_trace_buf)
return 1;
- return rcupreempt_debugfs_init();
+ ret = rcupreempt_debugfs_init();
+ if (ret)
+ kfree(rcupreempt_trace_buf);
+ return ret;
}
static void __exit rcupreempt_trace_cleanup(void)
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c
index 90b5b123f7a..85cb90588a5 100644
--- a/kernel/rcutorture.c
+++ b/kernel/rcutorture.c
@@ -42,10 +42,10 @@
#include <linux/freezer.h>
#include <linux/cpu.h>
#include <linux/delay.h>
-#include <linux/byteorder/swabb.h>
#include <linux/stat.h>
#include <linux/srcu.h>
#include <linux/slab.h>
+#include <asm/byteorder.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Paul E. McKenney <paulmck@us.ibm.com> and "
diff --git a/kernel/resource.c b/kernel/resource.c
index 03d796c1b2e..4089d12af6e 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -38,10 +38,6 @@ EXPORT_SYMBOL(iomem_resource);
static DEFINE_RWLOCK(resource_lock);
-#ifdef CONFIG_PROC_FS
-
-enum { MAX_IORES_LEVEL = 5 };
-
static void *r_next(struct seq_file *m, void *v, loff_t *pos)
{
struct resource *p = v;
@@ -53,6 +49,10 @@ static void *r_next(struct seq_file *m, void *v, loff_t *pos)
return p->sibling;
}
+#ifdef CONFIG_PROC_FS
+
+enum { MAX_IORES_LEVEL = 5 };
+
static void *r_start(struct seq_file *m, loff_t *pos)
__acquires(resource_lock)
{
@@ -516,6 +516,70 @@ int adjust_resource(struct resource *res, resource_size_t start, resource_size_t
return result;
}
+static void __init __reserve_region_with_split(struct resource *root,
+ resource_size_t start, resource_size_t end,
+ const char *name)
+{
+ struct resource *parent = root;
+ struct resource *conflict;
+ struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
+
+ if (!res)
+ return;
+
+ res->name = name;
+ res->start = start;
+ res->end = end;
+ res->flags = IORESOURCE_BUSY;
+
+ for (;;) {
+ conflict = __request_resource(parent, res);
+ if (!conflict)
+ break;
+ if (conflict != parent) {
+ parent = conflict;
+ if (!(conflict->flags & IORESOURCE_BUSY))
+ continue;
+ }
+
+ /* Uhhuh, that didn't work out.. */
+ kfree(res);
+ res = NULL;
+ break;
+ }
+
+ if (!res) {
+ /* failed, split and try again */
+
+ /* conflict covered whole area */
+ if (conflict->start <= start && conflict->end >= end)
+ return;
+
+ if (conflict->start > start)
+ __reserve_region_with_split(root, start, conflict->start-1, name);
+ if (!(conflict->flags & IORESOURCE_BUSY)) {
+ resource_size_t common_start, common_end;
+
+ common_start = max(conflict->start, start);
+ common_end = min(conflict->end, end);
+ if (common_start < common_end)
+ __reserve_region_with_split(root, common_start, common_end, name);
+ }
+ if (conflict->end < end)
+ __reserve_region_with_split(root, conflict->end+1, end, name);
+ }
+
+}
+
+void reserve_region_with_split(struct resource *root,
+ resource_size_t start, resource_size_t end,
+ const char *name)
+{
+ write_lock(&resource_lock);
+ __reserve_region_with_split(root, start, end, name);
+ write_unlock(&resource_lock);
+}
+
EXPORT_SYMBOL(adjust_resource);
/**
@@ -562,33 +626,34 @@ struct resource * __request_region(struct resource *parent,
{
struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
- if (res) {
- res->name = name;
- res->start = start;
- res->end = start + n - 1;
- res->flags = IORESOURCE_BUSY;
+ if (!res)
+ return NULL;
- write_lock(&resource_lock);
+ res->name = name;
+ res->start = start;
+ res->end = start + n - 1;
+ res->flags = IORESOURCE_BUSY;
- for (;;) {
- struct resource *conflict;
+ write_lock(&resource_lock);
- conflict = __request_resource(parent, res);
- if (!conflict)
- break;
- if (conflict != parent) {
- parent = conflict;
- if (!(conflict->flags & IORESOURCE_BUSY))
- continue;
- }
+ for (;;) {
+ struct resource *conflict;
- /* Uhhuh, that didn't work out.. */
- kfree(res);
- res = NULL;
+ conflict = __request_resource(parent, res);
+ if (!conflict)
break;
+ if (conflict != parent) {
+ parent = conflict;
+ if (!(conflict->flags & IORESOURCE_BUSY))
+ continue;
}
- write_unlock(&resource_lock);
+
+ /* Uhhuh, that didn't work out.. */
+ kfree(res);
+ res = NULL;
+ break;
}
+ write_unlock(&resource_lock);
return res;
}
EXPORT_SYMBOL(__request_region);
@@ -763,3 +828,40 @@ static int __init reserve_setup(char *str)
}
__setup("reserve=", reserve_setup);
+
+/*
+ * Check if the requested addr and size spans more than any slot in the
+ * iomem resource tree.
+ */
+int iomem_map_sanity_check(resource_size_t addr, unsigned long size)
+{
+ struct resource *p = &iomem_resource;
+ int err = 0;
+ loff_t l;
+
+ read_lock(&resource_lock);
+ for (p = p->child; p ; p = r_next(NULL, p, &l)) {
+ /*
+ * We can probably skip the resources without
+ * IORESOURCE_IO attribute?
+ */
+ if (p->start >= addr + size)
+ continue;
+ if (p->end < addr)
+ continue;
+ if (p->start <= addr && (p->end >= addr + size - 1))
+ continue;
+ printk(KERN_WARNING "resource map sanity check conflict: "
+ "0x%llx 0x%llx 0x%llx 0x%llx %s\n",
+ (unsigned long long)addr,
+ (unsigned long long)(addr + size - 1),
+ (unsigned long long)p->start,
+ (unsigned long long)p->end,
+ p->name);
+ err = -1;
+ break;
+ }
+ read_unlock(&resource_lock);
+
+ return err;
+}
diff --git a/kernel/sched.c b/kernel/sched.c
index ad1962dc0aa..d906f72b42d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -71,6 +71,7 @@
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/ftrace.h>
+#include <trace/sched.h>
#include <asm/tlb.h>
#include <asm/irq_regs.h>
@@ -204,11 +205,16 @@ void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
rt_b->rt_period_timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED;
}
+static inline int rt_bandwidth_enabled(void)
+{
+ return sysctl_sched_rt_runtime >= 0;
+}
+
static void start_rt_bandwidth(struct rt_bandwidth *rt_b)
{
ktime_t now;
- if (rt_b->rt_runtime == RUNTIME_INF)
+ if (rt_bandwidth_enabled() && rt_b->rt_runtime == RUNTIME_INF)
return;
if (hrtimer_active(&rt_b->rt_period_timer))
@@ -298,9 +304,9 @@ static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity);
static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp;
#endif /* CONFIG_RT_GROUP_SCHED */
-#else /* !CONFIG_FAIR_GROUP_SCHED */
+#else /* !CONFIG_USER_SCHED */
#define root_task_group init_task_group
-#endif /* CONFIG_FAIR_GROUP_SCHED */
+#endif /* CONFIG_USER_SCHED */
/* task_group_lock serializes add/remove of task groups and also changes to
* a task group's cpu shares.
@@ -604,9 +610,9 @@ struct rq {
static DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
-static inline void check_preempt_curr(struct rq *rq, struct task_struct *p)
+static inline void check_preempt_curr(struct rq *rq, struct task_struct *p, int sync)
{
- rq->curr->sched_class->check_preempt_curr(rq, p);
+ rq->curr->sched_class->check_preempt_curr(rq, p, sync);
}
static inline int cpu_of(struct rq *rq)
@@ -1102,7 +1108,7 @@ static void hrtick_start(struct rq *rq, u64 delay)
hrtimer_start(&rq->hrtick_timer, ns_to_ktime(delay), HRTIMER_MODE_REL);
}
-static void init_hrtick(void)
+static inline void init_hrtick(void)
{
}
#endif /* CONFIG_SMP */
@@ -1121,7 +1127,7 @@ static void init_rq_hrtick(struct rq *rq)
rq->hrtick_timer.function = hrtick;
rq->hrtick_timer.cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
}
-#else
+#else /* CONFIG_SCHED_HRTICK */
static inline void hrtick_clear(struct rq *rq)
{
}
@@ -1133,7 +1139,7 @@ static inline void init_rq_hrtick(struct rq *rq)
static inline void init_hrtick(void)
{
}
-#endif
+#endif /* CONFIG_SCHED_HRTICK */
/*
* resched_task - mark a task 'to be rescheduled now'.
@@ -1380,38 +1386,24 @@ static inline void dec_cpu_load(struct rq *rq, unsigned long load)
update_load_sub(&rq->load, load);
}
-#ifdef CONFIG_SMP
-static unsigned long source_load(int cpu, int type);
-static unsigned long target_load(int cpu, int type);
-static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
-
-static unsigned long cpu_avg_load_per_task(int cpu)
-{
- struct rq *rq = cpu_rq(cpu);
-
- if (rq->nr_running)
- rq->avg_load_per_task = rq->load.weight / rq->nr_running;
-
- return rq->avg_load_per_task;
-}
-
-#ifdef CONFIG_FAIR_GROUP_SCHED
-
-typedef void (*tg_visitor)(struct task_group *, int, struct sched_domain *);
+#if (defined(CONFIG_SMP) && defined(CONFIG_FAIR_GROUP_SCHED)) || defined(CONFIG_RT_GROUP_SCHED)
+typedef int (*tg_visitor)(struct task_group *, void *);
/*
* Iterate the full tree, calling @down when first entering a node and @up when
* leaving it for the final time.
*/
-static void
-walk_tg_tree(tg_visitor down, tg_visitor up, int cpu, struct sched_domain *sd)
+static int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
{
struct task_group *parent, *child;
+ int ret;
rcu_read_lock();
parent = &root_task_group;
down:
- (*down)(parent, cpu, sd);
+ ret = (*down)(parent, data);
+ if (ret)
+ goto out_unlock;
list_for_each_entry_rcu(child, &parent->children, siblings) {
parent = child;
goto down;
@@ -1419,14 +1411,42 @@ down:
up:
continue;
}
- (*up)(parent, cpu, sd);
+ ret = (*up)(parent, data);
+ if (ret)
+ goto out_unlock;
child = parent;
parent = parent->parent;
if (parent)
goto up;
+out_unlock:
rcu_read_unlock();
+
+ return ret;
+}
+
+static int tg_nop(struct task_group *tg, void *data)
+{
+ return 0;
}
+#endif
+
+#ifdef CONFIG_SMP
+static unsigned long source_load(int cpu, int type);
+static unsigned long target_load(int cpu, int type);
+static int task_hot(struct task_struct *p, u64 now, struct sched_domain *sd);
+
+static unsigned long cpu_avg_load_per_task(int cpu)
+{
+ struct rq *rq = cpu_rq(cpu);
+
+ if (rq->nr_running)
+ rq->avg_load_per_task = rq->load.weight / rq->nr_running;
+
+ return rq->avg_load_per_task;
+}
+
+#ifdef CONFIG_FAIR_GROUP_SCHED
static void __set_se_shares(struct sched_entity *se, unsigned long shares);
@@ -1486,11 +1506,11 @@ __update_group_shares_cpu(struct task_group *tg, int cpu,
* This needs to be done in a bottom-up fashion because the rq weight of a
* parent group depends on the shares of its child groups.
*/
-static void
-tg_shares_up(struct task_group *tg, int cpu, struct sched_domain *sd)
+static int tg_shares_up(struct task_group *tg, void *data)
{
unsigned long rq_weight = 0;
unsigned long shares = 0;
+ struct sched_domain *sd = data;
int i;
for_each_cpu_mask(i, sd->span) {
@@ -1515,6 +1535,8 @@ tg_shares_up(struct task_group *tg, int cpu, struct sched_domain *sd)
__update_group_shares_cpu(tg, i, shares, rq_weight);
spin_unlock_irqrestore(&rq->lock, flags);
}
+
+ return 0;
}
/*
@@ -1522,10 +1544,10 @@ tg_shares_up(struct task_group *tg, int cpu, struct sched_domain *sd)
* This needs to be done in a top-down fashion because the load of a child
* group is a fraction of its parents load.
*/
-static void
-tg_load_down(struct task_group *tg, int cpu, struct sched_domain *sd)
+static int tg_load_down(struct task_group *tg, void *data)
{
unsigned long load;
+ long cpu = (long)data;
if (!tg->parent) {
load = cpu_rq(cpu)->load.weight;
@@ -1536,11 +1558,8 @@ tg_load_down(struct task_group *tg, int cpu, struct sched_domain *sd)
}
tg->cfs_rq[cpu]->h_load = load;
-}
-static void
-tg_nop(struct task_group *tg, int cpu, struct sched_domain *sd)
-{
+ return 0;
}
static void update_shares(struct sched_domain *sd)
@@ -1550,7 +1569,7 @@ static void update_shares(struct sched_domain *sd)
if (elapsed >= (s64)(u64)sysctl_sched_shares_ratelimit) {
sd->last_update = now;
- walk_tg_tree(tg_nop, tg_shares_up, 0, sd);
+ walk_tg_tree(tg_nop, tg_shares_up, sd);
}
}
@@ -1561,9 +1580,9 @@ static void update_shares_locked(struct rq *rq, struct sched_domain *sd)
spin_lock(&rq->lock);
}
-static void update_h_load(int cpu)
+static void update_h_load(long cpu)
{
- walk_tg_tree(tg_load_down, tg_nop, cpu, NULL);
+ walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);
}
#else
@@ -1918,14 +1937,12 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
* just go back and repeat.
*/
rq = task_rq_lock(p, &flags);
+ trace_sched_wait_task(rq, p);
running = task_running(rq, p);
on_rq = p->se.on_rq;
ncsw = 0;
- if (!match_state || p->state == match_state) {
- ncsw = p->nivcsw + p->nvcsw;
- if (unlikely(!ncsw))
- ncsw = 1;
- }
+ if (!match_state || p->state == match_state)
+ ncsw = p->nvcsw | LONG_MIN; /* sets MSB */
task_rq_unlock(rq, &flags);
/*
@@ -2282,10 +2299,8 @@ out_activate:
success = 1;
out_running:
- trace_mark(kernel_sched_wakeup,
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- p->pid, p->state, rq, p, rq->curr);
- check_preempt_curr(rq, p);
+ trace_sched_wakeup(rq, p);
+ check_preempt_curr(rq, p, sync);
p->state = TASK_RUNNING;
#ifdef CONFIG_SMP
@@ -2417,10 +2432,8 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
p->sched_class->task_new(rq, p);
inc_nr_running(rq);
}
- trace_mark(kernel_sched_wakeup_new,
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- p->pid, p->state, rq, p, rq->curr);
- check_preempt_curr(rq, p);
+ trace_sched_wakeup_new(rq, p);
+ check_preempt_curr(rq, p, 0);
#ifdef CONFIG_SMP
if (p->sched_class->task_wake_up)
p->sched_class->task_wake_up(rq, p);
@@ -2592,11 +2605,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
struct mm_struct *mm, *oldmm;
prepare_task_switch(rq, prev, next);
- trace_mark(kernel_sched_schedule,
- "prev_pid %d next_pid %d prev_state %ld "
- "## rq %p prev %p next %p",
- prev->pid, next->pid, prev->state,
- rq, prev, next);
+ trace_sched_switch(rq, prev, next);
mm = next->mm;
oldmm = prev->active_mm;
/*
@@ -2836,6 +2845,7 @@ static void sched_migrate_task(struct task_struct *p, int dest_cpu)
|| unlikely(!cpu_active(dest_cpu)))
goto out;
+ trace_sched_migrate_task(rq, p, dest_cpu);
/* force the process onto the specified CPU */
if (migrate_task(p, dest_cpu, &req)) {
/* Need to wait for migration thread (might exit: take ref). */
@@ -2880,7 +2890,7 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
* Note that idle threads have a prio of MAX_PRIO, for this test
* to be always true for them.
*/
- check_preempt_curr(this_rq, p);
+ check_preempt_curr(this_rq, p, 0);
}
/*
@@ -4037,23 +4047,26 @@ DEFINE_PER_CPU(struct kernel_stat, kstat);
EXPORT_PER_CPU_SYMBOL(kstat);
/*
- * Return p->sum_exec_runtime plus any more ns on the sched_clock
- * that have not yet been banked in case the task is currently running.
+ * Return any ns on the sched_clock that have not yet been banked in
+ * @p in case that task is currently running.
*/
-unsigned long long task_sched_runtime(struct task_struct *p)
+unsigned long long task_delta_exec(struct task_struct *p)
{
unsigned long flags;
- u64 ns, delta_exec;
struct rq *rq;
+ u64 ns = 0;
rq = task_rq_lock(p, &flags);
- ns = p->se.sum_exec_runtime;
+
if (task_current(rq, p)) {
+ u64 delta_exec;
+
update_rq_clock(rq);
delta_exec = rq->clock - p->se.exec_start;
if ((s64)delta_exec > 0)
- ns += delta_exec;
+ ns = delta_exec;
}
+
task_rq_unlock(rq, &flags);
return ns;
@@ -4070,6 +4083,7 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
cputime64_t tmp;
p->utime = cputime_add(p->utime, cputime);
+ account_group_user_time(p, cputime);
/* Add user time to cpustat. */
tmp = cputime_to_cputime64(cputime);
@@ -4094,6 +4108,7 @@ static void account_guest_time(struct task_struct *p, cputime_t cputime)
tmp = cputime_to_cputime64(cputime);
p->utime = cputime_add(p->utime, cputime);
+ account_group_user_time(p, cputime);
p->gtime = cputime_add(p->gtime, cputime);
cpustat->user = cputime64_add(cpustat->user, tmp);
@@ -4129,6 +4144,7 @@ void account_system_time(struct task_struct *p, int hardirq_offset,
}
p->stime = cputime_add(p->stime, cputime);
+ account_group_system_time(p, cputime);
/* Add system time to cpustat. */
tmp = cputime_to_cputime64(cputime);
@@ -4170,6 +4186,7 @@ void account_steal_time(struct task_struct *p, cputime_t steal)
if (p == rq->idle) {
p->stime = cputime_add(p->stime, steal);
+ account_group_system_time(p, steal);
if (atomic_read(&rq->nr_iowait) > 0)
cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
else
@@ -4627,6 +4644,15 @@ __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr_exclusive)
}
EXPORT_SYMBOL_GPL(__wake_up_sync); /* For internal use only */
+/**
+ * complete: - signals a single thread waiting on this completion
+ * @x: holds the state of this particular completion
+ *
+ * This will wake up a single thread waiting on this completion. Threads will be
+ * awakened in the same order in which they were queued.
+ *
+ * See also complete_all(), wait_for_completion() and related routines.
+ */
void complete(struct completion *x)
{
unsigned long flags;
@@ -4638,6 +4664,12 @@ void complete(struct completion *x)
}
EXPORT_SYMBOL(complete);
+/**
+ * complete_all: - signals all threads waiting on this completion
+ * @x: holds the state of this particular completion
+ *
+ * This will wake up all threads waiting on this particular completion event.
+ */
void complete_all(struct completion *x)
{
unsigned long flags;
@@ -4658,10 +4690,7 @@ do_wait_for_common(struct completion *x, long timeout, int state)
wait.flags |= WQ_FLAG_EXCLUSIVE;
__add_wait_queue_tail(&x->wait, &wait);
do {
- if ((state == TASK_INTERRUPTIBLE &&
- signal_pending(current)) ||
- (state == TASK_KILLABLE &&
- fatal_signal_pending(current))) {
+ if (signal_pending_state(state, current)) {
timeout = -ERESTARTSYS;
break;
}
@@ -4689,12 +4718,31 @@ wait_for_common(struct completion *x, long timeout, int state)
return timeout;
}
+/**
+ * wait_for_completion: - waits for completion of a task
+ * @x: holds the state of this particular completion
+ *
+ * This waits to be signaled for completion of a specific task. It is NOT
+ * interruptible and there is no timeout.
+ *
+ * See also similar routines (i.e. wait_for_completion_timeout()) with timeout
+ * and interrupt capability. Also see complete().
+ */
void __sched wait_for_completion(struct completion *x)
{
wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(wait_for_completion);
+/**
+ * wait_for_completion_timeout: - waits for completion of a task (w/timeout)
+ * @x: holds the state of this particular completion
+ * @timeout: timeout value in jiffies
+ *
+ * This waits for either a completion of a specific task to be signaled or for a
+ * specified timeout to expire. The timeout is in jiffies. It is not
+ * interruptible.
+ */
unsigned long __sched
wait_for_completion_timeout(struct completion *x, unsigned long timeout)
{
@@ -4702,6 +4750,13 @@ wait_for_completion_timeout(struct completion *x, unsigned long timeout)
}
EXPORT_SYMBOL(wait_for_completion_timeout);
+/**
+ * wait_for_completion_interruptible: - waits for completion of a task (w/intr)
+ * @x: holds the state of this particular completion
+ *
+ * This waits for completion of a specific task to be signaled. It is
+ * interruptible.
+ */
int __sched wait_for_completion_interruptible(struct completion *x)
{
long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_INTERRUPTIBLE);
@@ -4711,6 +4766,14 @@ int __sched wait_for_completion_interruptible(struct completion *x)
}
EXPORT_SYMBOL(wait_for_completion_interruptible);
+/**
+ * wait_for_completion_interruptible_timeout: - waits for completion (w/(to,intr))
+ * @x: holds the state of this particular completion
+ * @timeout: timeout value in jiffies
+ *
+ * This waits for either a completion of a specific task to be signaled or for a
+ * specified timeout to expire. It is interruptible. The timeout is in jiffies.
+ */
unsigned long __sched
wait_for_completion_interruptible_timeout(struct completion *x,
unsigned long timeout)
@@ -4719,6 +4782,13 @@ wait_for_completion_interruptible_timeout(struct completion *x,
}
EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
+/**
+ * wait_for_completion_killable: - waits for completion of a task (killable)
+ * @x: holds the state of this particular completion
+ *
+ * This waits to be signaled for completion of a specific task. It can be
+ * interrupted by a kill signal.
+ */
int __sched wait_for_completion_killable(struct completion *x)
{
long t = wait_for_common(x, MAX_SCHEDULE_TIMEOUT, TASK_KILLABLE);
@@ -5121,7 +5191,8 @@ recheck:
* Do not allow realtime tasks into groups that have no runtime
* assigned.
*/
- if (rt_policy(policy) && task_group(p)->rt_bandwidth.rt_runtime == 0)
+ if (rt_bandwidth_enabled() && rt_policy(policy) &&
+ task_group(p)->rt_bandwidth.rt_runtime == 0)
return -EPERM;
#endif
@@ -5957,7 +6028,7 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
set_task_cpu(p, dest_cpu);
if (on_rq) {
activate_task(rq_dest, p, 0);
- check_preempt_curr(rq_dest, p);
+ check_preempt_curr(rq_dest, p, 0);
}
done:
ret = 1;
@@ -6282,7 +6353,7 @@ set_table_entry(struct ctl_table *entry,
static struct ctl_table *
sd_alloc_ctl_domain_table(struct sched_domain *sd)
{
- struct ctl_table *table = sd_alloc_ctl_entry(12);
+ struct ctl_table *table = sd_alloc_ctl_entry(13);
if (table == NULL)
return NULL;
@@ -6310,7 +6381,9 @@ sd_alloc_ctl_domain_table(struct sched_domain *sd)
sizeof(int), 0644, proc_dointvec_minmax);
set_table_entry(&table[10], "flags", &sd->flags,
sizeof(int), 0644, proc_dointvec_minmax);
- /* &table[11] is terminator */
+ set_table_entry(&table[11], "name", sd->name,
+ CORENAME_MAX_SIZE, 0444, proc_dostring);
+ /* &table[12] is terminator */
return table;
}
@@ -7194,13 +7267,21 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd)
* Non-inlined to reduce accumulated stack pressure in build_sched_domains()
*/
+#ifdef CONFIG_SCHED_DEBUG
+# define SD_INIT_NAME(sd, type) sd->name = #type
+#else
+# define SD_INIT_NAME(sd, type) do { } while (0)
+#endif
+
#define SD_INIT(sd, type) sd_init_##type(sd)
+
#define SD_INIT_FUNC(type) \
static noinline void sd_init_##type(struct sched_domain *sd) \
{ \
memset(sd, 0, sizeof(*sd)); \
*sd = SD_##type##_INIT; \
sd->level = SD_LV_##type; \
+ SD_INIT_NAME(sd, type); \
}
SD_INIT_FUNC(CPU)
@@ -8242,20 +8323,25 @@ void __might_sleep(char *file, int line)
#ifdef in_atomic
static unsigned long prev_jiffy; /* ratelimiting */
- if ((in_atomic() || irqs_disabled()) &&
- system_state == SYSTEM_RUNNING && !oops_in_progress) {
- if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
- return;
- prev_jiffy = jiffies;
- printk(KERN_ERR "BUG: sleeping function called from invalid"
- " context at %s:%d\n", file, line);
- printk("in_atomic():%d, irqs_disabled():%d\n",
- in_atomic(), irqs_disabled());
- debug_show_held_locks(current);
- if (irqs_disabled())
- print_irqtrace_events(current);
- dump_stack();
- }
+ if ((!in_atomic() && !irqs_disabled()) ||
+ system_state != SYSTEM_RUNNING || oops_in_progress)
+ return;
+ if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
+ return;
+ prev_jiffy = jiffies;
+
+ printk(KERN_ERR
+ "BUG: sleeping function called from invalid context at %s:%d\n",
+ file, line);
+ printk(KERN_ERR
+ "in_atomic(): %d, irqs_disabled(): %d, pid: %d, name: %s\n",
+ in_atomic(), irqs_disabled(),
+ current->pid, current->comm);
+
+ debug_show_held_locks(current);
+ if (irqs_disabled())
+ print_irqtrace_events(current);
+ dump_stack();
#endif
}
EXPORT_SYMBOL(__might_sleep);
@@ -8753,73 +8839,95 @@ static DEFINE_MUTEX(rt_constraints_mutex);
static unsigned long to_ratio(u64 period, u64 runtime)
{
if (runtime == RUNTIME_INF)
- return 1ULL << 16;
+ return 1ULL << 20;
- return div64_u64(runtime << 16, period);
+ return div64_u64(runtime << 20, period);
}
-#ifdef CONFIG_CGROUP_SCHED
-static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
+/* Must be called with tasklist_lock held */
+static inline int tg_has_rt_tasks(struct task_group *tg)
{
- struct task_group *tgi, *parent = tg->parent;
- unsigned long total = 0;
+ struct task_struct *g, *p;
- if (!parent) {
- if (global_rt_period() < period)
- return 0;
+ do_each_thread(g, p) {
+ if (rt_task(p) && rt_rq_of_se(&p->rt)->tg == tg)
+ return 1;
+ } while_each_thread(g, p);
- return to_ratio(period, runtime) <
- to_ratio(global_rt_period(), global_rt_runtime());
- }
+ return 0;
+}
- if (ktime_to_ns(parent->rt_bandwidth.rt_period) < period)
- return 0;
+struct rt_schedulable_data {
+ struct task_group *tg;
+ u64 rt_period;
+ u64 rt_runtime;
+};
- rcu_read_lock();
- list_for_each_entry_rcu(tgi, &parent->children, siblings) {
- if (tgi == tg)
- continue;
+static int tg_schedulable(struct task_group *tg, void *data)
+{
+ struct rt_schedulable_data *d = data;
+ struct task_group *child;
+ unsigned long total, sum = 0;
+ u64 period, runtime;
+
+ period = ktime_to_ns(tg->rt_bandwidth.rt_period);
+ runtime = tg->rt_bandwidth.rt_runtime;
- total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
- tgi->rt_bandwidth.rt_runtime);
+ if (tg == d->tg) {
+ period = d->rt_period;
+ runtime = d->rt_runtime;
}
- rcu_read_unlock();
- return total + to_ratio(period, runtime) <=
- to_ratio(ktime_to_ns(parent->rt_bandwidth.rt_period),
- parent->rt_bandwidth.rt_runtime);
-}
-#elif defined CONFIG_USER_SCHED
-static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
-{
- struct task_group *tgi;
- unsigned long total = 0;
- unsigned long global_ratio =
- to_ratio(global_rt_period(), global_rt_runtime());
+ /*
+ * Cannot have more runtime than the period.
+ */
+ if (runtime > period && runtime != RUNTIME_INF)
+ return -EINVAL;
- rcu_read_lock();
- list_for_each_entry_rcu(tgi, &task_groups, list) {
- if (tgi == tg)
- continue;
+ /*
+ * Ensure we don't starve existing RT tasks.
+ */
+ if (rt_bandwidth_enabled() && !runtime && tg_has_rt_tasks(tg))
+ return -EBUSY;
+
+ total = to_ratio(period, runtime);
+
+ /*
+ * Nobody can have more than the global setting allows.
+ */
+ if (total > to_ratio(global_rt_period(), global_rt_runtime()))
+ return -EINVAL;
+
+ /*
+ * The sum of our children's runtime should not exceed our own.
+ */
+ list_for_each_entry_rcu(child, &tg->children, siblings) {
+ period = ktime_to_ns(child->rt_bandwidth.rt_period);
+ runtime = child->rt_bandwidth.rt_runtime;
- total += to_ratio(ktime_to_ns(tgi->rt_bandwidth.rt_period),
- tgi->rt_bandwidth.rt_runtime);
+ if (child == d->tg) {
+ period = d->rt_period;
+ runtime = d->rt_runtime;
+ }
+
+ sum += to_ratio(period, runtime);
}
- rcu_read_unlock();
- return total + to_ratio(period, runtime) < global_ratio;
+ if (sum > total)
+ return -EINVAL;
+
+ return 0;
}
-#endif
-/* Must be called with tasklist_lock held */
-static inline int tg_has_rt_tasks(struct task_group *tg)
+static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
{
- struct task_struct *g, *p;
- do_each_thread(g, p) {
- if (rt_task(p) && rt_rq_of_se(&p->rt)->tg == tg)
- return 1;
- } while_each_thread(g, p);
- return 0;
+ struct rt_schedulable_data data = {
+ .tg = tg,
+ .rt_period = period,
+ .rt_runtime = runtime,
+ };
+
+ return walk_tg_tree(tg_schedulable, tg_nop, &data);
}
static int tg_set_bandwidth(struct task_group *tg,
@@ -8829,14 +8937,9 @@ static int tg_set_bandwidth(struct task_group *tg,
mutex_lock(&rt_constraints_mutex);
read_lock(&tasklist_lock);
- if (rt_runtime == 0 && tg_has_rt_tasks(tg)) {
- err = -EBUSY;
+ err = __rt_schedulable(tg, rt_period, rt_runtime);
+ if (err)
goto unlock;
- }
- if (!__rt_schedulable(tg, rt_period, rt_runtime)) {
- err = -EINVAL;
- goto unlock;
- }
spin_lock_irq(&tg->rt_bandwidth.rt_runtime_lock);
tg->rt_bandwidth.rt_period = ns_to_ktime(rt_period);
@@ -8905,19 +9008,25 @@ long sched_group_rt_period(struct task_group *tg)
static int sched_rt_global_constraints(void)
{
- struct task_group *tg = &root_task_group;
- u64 rt_runtime, rt_period;
+ u64 runtime, period;
int ret = 0;
if (sysctl_sched_rt_period <= 0)
return -EINVAL;
- rt_period = ktime_to_ns(tg->rt_bandwidth.rt_period);
- rt_runtime = tg->rt_bandwidth.rt_runtime;
+ runtime = global_rt_runtime();
+ period = global_rt_period();
+
+ /*
+ * Sanity check on the sysctl variables.
+ */
+ if (runtime > period && runtime != RUNTIME_INF)
+ return -EINVAL;
mutex_lock(&rt_constraints_mutex);
- if (!__rt_schedulable(tg, rt_period, rt_runtime))
- ret = -EINVAL;
+ read_lock(&tasklist_lock);
+ ret = __rt_schedulable(NULL, 0, 0);
+ read_unlock(&tasklist_lock);
mutex_unlock(&rt_constraints_mutex);
return ret;
@@ -8991,7 +9100,6 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
if (!cgrp->parent) {
/* This is early initialization for the top cgroup */
- init_task_group.css.cgroup = cgrp;
return &init_task_group.css;
}
@@ -9000,9 +9108,6 @@ cpu_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cgrp)
if (IS_ERR(tg))
return ERR_PTR(-ENOMEM);
- /* Bind the cgroup to task_group object we just created */
- tg->css.cgroup = cgrp;
-
return &tg->css;
}
diff --git a/kernel/sched_clock.c b/kernel/sched_clock.c
index e8ab096ddfe..81787248b60 100644
--- a/kernel/sched_clock.c
+++ b/kernel/sched_clock.c
@@ -118,13 +118,13 @@ static u64 __update_sched_clock(struct sched_clock_data *scd, u64 now)
/*
* scd->clock = clamp(scd->tick_gtod + delta,
- * max(scd->tick_gtod, scd->clock),
- * scd->tick_gtod + TICK_NSEC);
+ * max(scd->tick_gtod, scd->clock),
+ * max(scd->clock, scd->tick_gtod + TICK_NSEC));
*/
clock = scd->tick_gtod + delta;
min_clock = wrap_max(scd->tick_gtod, scd->clock);
- max_clock = scd->tick_gtod + TICK_NSEC;
+ max_clock = wrap_max(scd->clock, scd->tick_gtod + TICK_NSEC);
clock = wrap_max(clock, min_clock);
clock = wrap_min(clock, max_clock);
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index bbe6b31c3c5..ad958c1ec70 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -333,12 +333,10 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
unsigned long flags;
int num_threads = 1;
- rcu_read_lock();
if (lock_task_sighand(p, &flags)) {
num_threads = atomic_read(&p->signal->count);
unlock_task_sighand(p, &flags);
}
- rcu_read_unlock();
SEQ_printf(m, "%s (%d, #threads: %d)\n", p->comm, p->pid, num_threads);
SEQ_printf(m,
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index fb8994c6d4b..f604dae7131 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -409,64 +409,6 @@ static u64 sched_vslice_add(struct cfs_rq *cfs_rq, struct sched_entity *se)
}
/*
- * The goal of calc_delta_asym() is to be asymmetrically around NICE_0_LOAD, in
- * that it favours >=0 over <0.
- *
- * -20 |
- * |
- * 0 --------+-------
- * .'
- * 19 .'
- *
- */
-static unsigned long
-calc_delta_asym(unsigned long delta, struct sched_entity *se)
-{
- struct load_weight lw = {
- .weight = NICE_0_LOAD,
- .inv_weight = 1UL << (WMULT_SHIFT-NICE_0_SHIFT)
- };
-
- for_each_sched_entity(se) {
- struct load_weight *se_lw = &se->load;
- unsigned long rw = cfs_rq_of(se)->load.weight;
-
-#ifdef CONFIG_FAIR_SCHED_GROUP
- struct cfs_rq *cfs_rq = se->my_q;
- struct task_group *tg = NULL
-
- if (cfs_rq)
- tg = cfs_rq->tg;
-
- if (tg && tg->shares < NICE_0_LOAD) {
- /*
- * scale shares to what it would have been had
- * tg->weight been NICE_0_LOAD:
- *
- * weight = 1024 * shares / tg->weight
- */
- lw.weight *= se->load.weight;
- lw.weight /= tg->shares;
-
- lw.inv_weight = 0;
-
- se_lw = &lw;
- rw += lw.weight - se->load.weight;
- } else
-#endif
-
- if (se->load.weight < NICE_0_LOAD) {
- se_lw = &lw;
- rw += NICE_0_LOAD - se->load.weight;
- }
-
- delta = calc_delta_mine(delta, rw, se_lw);
- }
-
- return delta;
-}
-
-/*
* Update the current task's runtime statistics. Skip current tasks that
* are not in our scheduling class.
*/
@@ -507,6 +449,7 @@ static void update_curr(struct cfs_rq *cfs_rq)
struct task_struct *curtask = task_of(curr);
cpuacct_charge(curtask, delta_exec);
+ account_group_exec_runtime(curtask, delta_exec);
}
}
@@ -586,11 +529,12 @@ account_entity_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se)
update_load_add(&cfs_rq->load, se->load.weight);
if (!parent_entity(se))
inc_cpu_load(rq_of(cfs_rq), se->load.weight);
- if (entity_is_task(se))
+ if (entity_is_task(se)) {
add_cfs_task_weight(cfs_rq, se->load.weight);
+ list_add(&se->group_node, &cfs_rq->tasks);
+ }
cfs_rq->nr_running++;
se->on_rq = 1;
- list_add(&se->group_node, &cfs_rq->tasks);
}
static void
@@ -599,11 +543,12 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
update_load_sub(&cfs_rq->load, se->load.weight);
if (!parent_entity(se))
dec_cpu_load(rq_of(cfs_rq), se->load.weight);
- if (entity_is_task(se))
+ if (entity_is_task(se)) {
add_cfs_task_weight(cfs_rq, -se->load.weight);
+ list_del_init(&se->group_node);
+ }
cfs_rq->nr_running--;
se->on_rq = 0;
- list_del_init(&se->group_node);
}
static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
@@ -1085,7 +1030,6 @@ static long effective_load(struct task_group *tg, int cpu,
long wl, long wg)
{
struct sched_entity *se = tg->se[cpu];
- long more_w;
if (!tg->parent)
return wl;
@@ -1097,18 +1041,17 @@ static long effective_load(struct task_group *tg, int cpu,
if (!wl && sched_feat(ASYM_EFF_LOAD))
return wl;
- /*
- * Instead of using this increment, also add the difference
- * between when the shares were last updated and now.
- */
- more_w = se->my_q->load.weight - se->my_q->rq_weight;
- wl += more_w;
- wg += more_w;
-
for_each_sched_entity(se) {
-#define D(n) (likely(n) ? (n) : 1)
-
long S, rw, s, a, b;
+ long more_w;
+
+ /*
+ * Instead of using this increment, also add the difference
+ * between when the shares were last updated and now.
+ */
+ more_w = se->my_q->load.weight - se->my_q->rq_weight;
+ wl += more_w;
+ wg += more_w;
S = se->my_q->tg->shares;
s = se->my_q->shares;
@@ -1117,7 +1060,11 @@ static long effective_load(struct task_group *tg, int cpu,
a = S*(rw + wl);
b = S*rw + s*wg;
- wl = s*(a-b)/D(b);
+ wl = s*(a-b);
+
+ if (likely(b))
+ wl /= b;
+
/*
* Assume the group is already running and will
* thus already be accounted for in the weight.
@@ -1126,7 +1073,6 @@ static long effective_load(struct task_group *tg, int cpu,
* alter the group weight.
*/
wg = 0;
-#undef D
}
return wl;
@@ -1143,7 +1089,7 @@ static inline unsigned long effective_load(struct task_group *tg, int cpu,
#endif
static int
-wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
+wake_affine(struct sched_domain *this_sd, struct rq *this_rq,
struct task_struct *p, int prev_cpu, int this_cpu, int sync,
int idx, unsigned long load, unsigned long this_load,
unsigned int imbalance)
@@ -1158,6 +1104,11 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
if (!(this_sd->flags & SD_WAKE_AFFINE) || !sched_feat(AFFINE_WAKEUPS))
return 0;
+ if (!sync && sched_feat(SYNC_WAKEUPS) &&
+ curr->se.avg_overlap < sysctl_sched_migration_cost &&
+ p->se.avg_overlap < sysctl_sched_migration_cost)
+ sync = 1;
+
/*
* If sync wakeup then subtract the (maximum possible)
* effect of the currently running task from the load
@@ -1182,17 +1133,14 @@ wake_affine(struct rq *rq, struct sched_domain *this_sd, struct rq *this_rq,
* a reasonable amount of time then attract this newly
* woken task:
*/
- if (sync && balanced) {
- if (curr->se.avg_overlap < sysctl_sched_migration_cost &&
- p->se.avg_overlap < sysctl_sched_migration_cost)
- return 1;
- }
+ if (sync && balanced)
+ return 1;
schedstat_inc(p, se.nr_wakeups_affine_attempts);
tl_per_task = cpu_avg_load_per_task(this_cpu);
- if ((tl <= load && tl + target_load(prev_cpu, idx) <= tl_per_task) ||
- balanced) {
+ if (balanced || (tl <= load && tl + target_load(prev_cpu, idx) <=
+ tl_per_task)) {
/*
* This domain has SD_WAKE_AFFINE and
* p is cache cold in this domain, and
@@ -1211,16 +1159,17 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
struct sched_domain *sd, *this_sd = NULL;
int prev_cpu, this_cpu, new_cpu;
unsigned long load, this_load;
- struct rq *rq, *this_rq;
+ struct rq *this_rq;
unsigned int imbalance;
int idx;
prev_cpu = task_cpu(p);
- rq = task_rq(p);
this_cpu = smp_processor_id();
this_rq = cpu_rq(this_cpu);
new_cpu = prev_cpu;
+ if (prev_cpu == this_cpu)
+ goto out;
/*
* 'this_sd' is the first domain that both
* this_cpu and prev_cpu are present in:
@@ -1248,13 +1197,10 @@ static int select_task_rq_fair(struct task_struct *p, int sync)
load = source_load(prev_cpu, idx);
this_load = target_load(this_cpu, idx);
- if (wake_affine(rq, this_sd, this_rq, p, prev_cpu, this_cpu, sync, idx,
+ if (wake_affine(this_sd, this_rq, p, prev_cpu, this_cpu, sync, idx,
load, this_load, imbalance))
return this_cpu;
- if (prev_cpu == this_cpu)
- goto out;
-
/*
* Start passive balancing when half the imbalance_pct
* limit is reached.
@@ -1281,62 +1227,20 @@ static unsigned long wakeup_gran(struct sched_entity *se)
* + nice tasks.
*/
if (sched_feat(ASYM_GRAN))
- gran = calc_delta_asym(sysctl_sched_wakeup_granularity, se);
- else
- gran = calc_delta_fair(sysctl_sched_wakeup_granularity, se);
+ gran = calc_delta_mine(gran, NICE_0_LOAD, &se->load);
return gran;
}
/*
- * Should 'se' preempt 'curr'.
- *
- * |s1
- * |s2
- * |s3
- * g
- * |<--->|c
- *
- * w(c, s1) = -1
- * w(c, s2) = 0
- * w(c, s3) = 1
- *
- */
-static int
-wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
-{
- s64 gran, vdiff = curr->vruntime - se->vruntime;
-
- if (vdiff < 0)
- return -1;
-
- gran = wakeup_gran(curr);
- if (vdiff > gran)
- return 1;
-
- return 0;
-}
-
-/* return depth at which a sched entity is present in the hierarchy */
-static inline int depth_se(struct sched_entity *se)
-{
- int depth = 0;
-
- for_each_sched_entity(se)
- depth++;
-
- return depth;
-}
-
-/*
* Preempt the current task with a newly woken task if needed:
*/
-static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
+static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
{
struct task_struct *curr = rq->curr;
struct cfs_rq *cfs_rq = task_cfs_rq(curr);
struct sched_entity *se = &curr->se, *pse = &p->se;
- int se_depth, pse_depth;
+ s64 delta_exec;
if (unlikely(rt_prio(p->prio))) {
update_rq_clock(rq);
@@ -1351,6 +1255,13 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
cfs_rq_of(pse)->next = pse;
/*
+ * We can come here with TIF_NEED_RESCHED already set from new task
+ * wake up path.
+ */
+ if (test_tsk_need_resched(curr))
+ return;
+
+ /*
* Batch tasks do not preempt (their preemption is driven by
* the tick):
*/
@@ -1360,33 +1271,15 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p)
if (!sched_feat(WAKEUP_PREEMPT))
return;
- /*
- * preemption test can be made between sibling entities who are in the
- * same cfs_rq i.e who have a common parent. Walk up the hierarchy of
- * both tasks until we find their ancestors who are siblings of common
- * parent.
- */
-
- /* First walk up until both entities are at same depth */
- se_depth = depth_se(se);
- pse_depth = depth_se(pse);
-
- while (se_depth > pse_depth) {
- se_depth--;
- se = parent_entity(se);
- }
-
- while (pse_depth > se_depth) {
- pse_depth--;
- pse = parent_entity(pse);
- }
-
- while (!is_same_group(se, pse)) {
- se = parent_entity(se);
- pse = parent_entity(pse);
+ if (sched_feat(WAKEUP_OVERLAP) && (sync ||
+ (se->avg_overlap < sysctl_sched_migration_cost &&
+ pse->avg_overlap < sysctl_sched_migration_cost))) {
+ resched_task(curr);
+ return;
}
- if (wakeup_preempt_entity(se, pse) == 1)
+ delta_exec = se->sum_exec_runtime - se->prev_sum_exec_runtime;
+ if (delta_exec > wakeup_gran(pse))
resched_task(curr);
}
@@ -1445,19 +1338,9 @@ __load_balance_iterator(struct cfs_rq *cfs_rq, struct list_head *next)
if (next == &cfs_rq->tasks)
return NULL;
- /* Skip over entities that are not tasks */
- do {
- se = list_entry(next, struct sched_entity, group_node);
- next = next->next;
- } while (next != &cfs_rq->tasks && !entity_is_task(se));
-
- if (next == &cfs_rq->tasks)
- return NULL;
-
- cfs_rq->balance_iterator = next;
-
- if (entity_is_task(se))
- p = task_of(se);
+ se = list_entry(next, struct sched_entity, group_node);
+ p = task_of(se);
+ cfs_rq->balance_iterator = next->next;
return p;
}
@@ -1507,7 +1390,7 @@ load_balance_fair(struct rq *this_rq, int this_cpu, struct rq *busiest,
rcu_read_lock();
update_h_load(busiest_cpu);
- list_for_each_entry(tg, &task_groups, list) {
+ list_for_each_entry_rcu(tg, &task_groups, list) {
struct cfs_rq *busiest_cfs_rq = tg->cfs_rq[busiest_cpu];
unsigned long busiest_h_load = busiest_cfs_rq->h_load;
unsigned long busiest_weight = busiest_cfs_rq->load.weight;
@@ -1620,10 +1503,10 @@ static void task_new_fair(struct rq *rq, struct task_struct *p)
* 'current' within the tree based on its new key value.
*/
swap(curr->vruntime, se->vruntime);
+ resched_task(rq->curr);
}
enqueue_task_fair(rq, p, 0);
- resched_task(rq->curr);
}
/*
@@ -1642,7 +1525,7 @@ static void prio_changed_fair(struct rq *rq, struct task_struct *p,
if (p->prio > oldprio)
resched_task(rq->curr);
} else
- check_preempt_curr(rq, p);
+ check_preempt_curr(rq, p, 0);
}
/*
@@ -1659,7 +1542,7 @@ static void switched_to_fair(struct rq *rq, struct task_struct *p,
if (running)
resched_task(rq->curr);
else
- check_preempt_curr(rq, p);
+ check_preempt_curr(rq, p, 0);
}
/* Account for a task changing its policy or group.
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 9353ca78154..7c9e8f4a049 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -11,3 +11,4 @@ SCHED_FEAT(ASYM_GRAN, 1)
SCHED_FEAT(LB_BIAS, 1)
SCHED_FEAT(LB_WAKEUP_UPDATE, 1)
SCHED_FEAT(ASYM_EFF_LOAD, 1)
+SCHED_FEAT(WAKEUP_OVERLAP, 0)
diff --git a/kernel/sched_idletask.c b/kernel/sched_idletask.c
index 3a4f92dbbe6..dec4ccabe2f 100644
--- a/kernel/sched_idletask.c
+++ b/kernel/sched_idletask.c
@@ -14,7 +14,7 @@ static int select_task_rq_idle(struct task_struct *p, int sync)
/*
* Idle tasks are unconditionally rescheduled:
*/
-static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p)
+static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int sync)
{
resched_task(rq->idle);
}
@@ -76,7 +76,7 @@ static void switched_to_idle(struct rq *rq, struct task_struct *p,
if (running)
resched_task(rq->curr);
else
- check_preempt_curr(rq, p);
+ check_preempt_curr(rq, p, 0);
}
static void prio_changed_idle(struct rq *rq, struct task_struct *p,
@@ -93,7 +93,7 @@ static void prio_changed_idle(struct rq *rq, struct task_struct *p,
if (p->prio > oldprio)
resched_task(rq->curr);
} else
- check_preempt_curr(rq, p);
+ check_preempt_curr(rq, p, 0);
}
/*
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 1113157b205..b446dc87494 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -102,12 +102,12 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se);
static void sched_rt_rq_enqueue(struct rt_rq *rt_rq)
{
+ struct task_struct *curr = rq_of_rt_rq(rt_rq)->curr;
struct sched_rt_entity *rt_se = rt_rq->rt_se;
- if (rt_se && !on_rt_rq(rt_se) && rt_rq->rt_nr_running) {
- struct task_struct *curr = rq_of_rt_rq(rt_rq)->curr;
-
- enqueue_rt_entity(rt_se);
+ if (rt_rq->rt_nr_running) {
+ if (rt_se && !on_rt_rq(rt_se))
+ enqueue_rt_entity(rt_se);
if (rt_rq->highest_prio < curr->prio)
resched_task(curr);
}
@@ -231,6 +231,9 @@ static inline struct rt_bandwidth *sched_rt_bandwidth(struct rt_rq *rt_rq)
#endif /* CONFIG_RT_GROUP_SCHED */
#ifdef CONFIG_SMP
+/*
+ * We ran out of runtime, see if we can borrow some from our neighbours.
+ */
static int do_balance_runtime(struct rt_rq *rt_rq)
{
struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
@@ -250,9 +253,18 @@ static int do_balance_runtime(struct rt_rq *rt_rq)
continue;
spin_lock(&iter->rt_runtime_lock);
+ /*
+ * Either all rqs have inf runtime and there's nothing to steal
+ * or __disable_runtime() below sets a specific rq to inf to
+ * indicate its been disabled and disalow stealing.
+ */
if (iter->rt_runtime == RUNTIME_INF)
goto next;
+ /*
+ * From runqueues with spare time, take 1/n part of their
+ * spare time, but no more than our period.
+ */
diff = iter->rt_runtime - iter->rt_time;
if (diff > 0) {
diff = div_u64((u64)diff, weight);
@@ -274,6 +286,9 @@ next:
return more;
}
+/*
+ * Ensure this RQ takes back all the runtime it lend to its neighbours.
+ */
static void __disable_runtime(struct rq *rq)
{
struct root_domain *rd = rq->rd;
@@ -289,17 +304,33 @@ static void __disable_runtime(struct rq *rq)
spin_lock(&rt_b->rt_runtime_lock);
spin_lock(&rt_rq->rt_runtime_lock);
+ /*
+ * Either we're all inf and nobody needs to borrow, or we're
+ * already disabled and thus have nothing to do, or we have
+ * exactly the right amount of runtime to take out.
+ */
if (rt_rq->rt_runtime == RUNTIME_INF ||
rt_rq->rt_runtime == rt_b->rt_runtime)
goto balanced;
spin_unlock(&rt_rq->rt_runtime_lock);
+ /*
+ * Calculate the difference between what we started out with
+ * and what we current have, that's the amount of runtime
+ * we lend and now have to reclaim.
+ */
want = rt_b->rt_runtime - rt_rq->rt_runtime;
+ /*
+ * Greedy reclaim, take back as much as we can.
+ */
for_each_cpu_mask(i, rd->span) {
struct rt_rq *iter = sched_rt_period_rt_rq(rt_b, i);
s64 diff;
+ /*
+ * Can't reclaim from ourselves or disabled runqueues.
+ */
if (iter == rt_rq || iter->rt_runtime == RUNTIME_INF)
continue;
@@ -319,8 +350,16 @@ static void __disable_runtime(struct rq *rq)
}
spin_lock(&rt_rq->rt_runtime_lock);
+ /*
+ * We cannot be left wanting - that would mean some runtime
+ * leaked out of the system.
+ */
BUG_ON(want);
balanced:
+ /*
+ * Disable all the borrow logic by pretending we have inf
+ * runtime - in which case borrowing doesn't make sense.
+ */
rt_rq->rt_runtime = RUNTIME_INF;
spin_unlock(&rt_rq->rt_runtime_lock);
spin_unlock(&rt_b->rt_runtime_lock);
@@ -343,6 +382,9 @@ static void __enable_runtime(struct rq *rq)
if (unlikely(!scheduler_running))
return;
+ /*
+ * Reset each runqueue's bandwidth settings
+ */
for_each_leaf_rt_rq(rt_rq, rq) {
struct rt_bandwidth *rt_b = sched_rt_bandwidth(rt_rq);
@@ -389,7 +431,7 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
int i, idle = 1;
cpumask_t span;
- if (rt_b->rt_runtime == RUNTIME_INF)
+ if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)
return 1;
span = sched_rt_period_mask();
@@ -484,9 +526,14 @@ static void update_curr_rt(struct rq *rq)
schedstat_set(curr->se.exec_max, max(curr->se.exec_max, delta_exec));
curr->se.sum_exec_runtime += delta_exec;
+ account_group_exec_runtime(curr, delta_exec);
+
curr->se.exec_start = rq->clock;
cpuacct_charge(curr, delta_exec);
+ if (!rt_bandwidth_enabled())
+ return;
+
for_each_sched_rt_entity(rt_se) {
rt_rq = rt_rq_of_se(rt_se);
@@ -784,7 +831,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
/*
* Preempt the current task with a newly woken task if needed:
*/
-static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p)
+static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p, int sync)
{
if (p->prio < rq->curr->prio) {
resched_task(rq->curr);
@@ -1413,7 +1460,7 @@ static void watchdog(struct rq *rq, struct task_struct *p)
p->rt.timeout++;
next = DIV_ROUND_UP(min(soft, hard), USEC_PER_SEC/HZ);
if (p->rt.timeout > next)
- p->it_sched_expires = p->se.sum_exec_runtime;
+ p->cputime_expires.sched_exp = p->se.sum_exec_runtime;
}
}
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 8385d43987e..b8c156979cf 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -270,3 +270,89 @@ sched_info_switch(struct task_struct *prev, struct task_struct *next)
#define sched_info_switch(t, next) do { } while (0)
#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
+/*
+ * The following are functions that support scheduler-internal time accounting.
+ * These functions are generally called at the timer tick. None of this depends
+ * on CONFIG_SCHEDSTATS.
+ */
+
+/**
+ * account_group_user_time - Maintain utime for a thread group.
+ *
+ * @tsk: Pointer to task structure.
+ * @cputime: Time value by which to increment the utime field of the
+ * thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the utime field there.
+ */
+static inline void account_group_user_time(struct task_struct *tsk,
+ cputime_t cputime)
+{
+ struct signal_struct *sig;
+
+ sig = tsk->signal;
+ if (unlikely(!sig))
+ return;
+ if (sig->cputime.totals) {
+ struct task_cputime *times;
+
+ times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+ times->utime = cputime_add(times->utime, cputime);
+ put_cpu_no_resched();
+ }
+}
+
+/**
+ * account_group_system_time - Maintain stime for a thread group.
+ *
+ * @tsk: Pointer to task structure.
+ * @cputime: Time value by which to increment the stime field of the
+ * thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the stime field there.
+ */
+static inline void account_group_system_time(struct task_struct *tsk,
+ cputime_t cputime)
+{
+ struct signal_struct *sig;
+
+ sig = tsk->signal;
+ if (unlikely(!sig))
+ return;
+ if (sig->cputime.totals) {
+ struct task_cputime *times;
+
+ times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+ times->stime = cputime_add(times->stime, cputime);
+ put_cpu_no_resched();
+ }
+}
+
+/**
+ * account_group_exec_runtime - Maintain exec runtime for a thread group.
+ *
+ * @tsk: Pointer to task structure.
+ * @ns: Time value by which to increment the sum_exec_runtime field
+ * of the thread_group_cputime structure.
+ *
+ * If thread group time is being maintained, get the structure for the
+ * running CPU and update the sum_exec_runtime field there.
+ */
+static inline void account_group_exec_runtime(struct task_struct *tsk,
+ unsigned long long ns)
+{
+ struct signal_struct *sig;
+
+ sig = tsk->signal;
+ if (unlikely(!sig))
+ return;
+ if (sig->cputime.totals) {
+ struct task_cputime *times;
+
+ times = per_cpu_ptr(sig->cputime.totals, get_cpu());
+ times->sum_exec_runtime += ns;
+ put_cpu_no_resched();
+ }
+}
diff --git a/kernel/signal.c b/kernel/signal.c
index e661b01d340..105217da5c8 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -27,6 +27,7 @@
#include <linux/freezer.h>
#include <linux/pid_namespace.h>
#include <linux/nsproxy.h>
+#include <trace/sched.h>
#include <asm/param.h>
#include <asm/uaccess.h>
@@ -803,6 +804,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
struct sigpending *pending;
struct sigqueue *q;
+ trace_sched_signal_send(sig, t);
+
assert_spin_locked(&t->sighand->siglock);
if (!prepare_signal(sig, t))
return 0;
@@ -1338,6 +1341,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
struct siginfo info;
unsigned long flags;
struct sighand_struct *psig;
+ struct task_cputime cputime;
int ret = sig;
BUG_ON(sig == -1);
@@ -1368,10 +1372,9 @@ int do_notify_parent(struct task_struct *tsk, int sig)
info.si_uid = tsk->uid;
- info.si_utime = cputime_to_clock_t(cputime_add(tsk->utime,
- tsk->signal->utime));
- info.si_stime = cputime_to_clock_t(cputime_add(tsk->stime,
- tsk->signal->stime));
+ thread_group_cputime(tsk, &cputime);
+ info.si_utime = cputime_to_jiffies(cputime.utime);
+ info.si_stime = cputime_to_jiffies(cputime.stime);
info.si_status = tsk->exit_code & 0x7f;
if (tsk->exit_code & 0x80)
diff --git a/kernel/softirq.c b/kernel/softirq.c
index c506f266a6b..7110daeb9a9 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -6,6 +6,8 @@
* Distribute under GPLv2.
*
* Rewritten. Old one was good in 2.2, but in 2.3 it was immoral. --ANK (990903)
+ *
+ * Remote softirq infrastructure is by Jens Axboe.
*/
#include <linux/module.h>
@@ -46,7 +48,7 @@ irq_cpustat_t irq_stat[NR_CPUS] ____cacheline_aligned;
EXPORT_SYMBOL(irq_stat);
#endif
-static struct softirq_action softirq_vec[32] __cacheline_aligned_in_smp;
+static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
static DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
@@ -205,7 +207,18 @@ restart:
do {
if (pending & 1) {
+ int prev_count = preempt_count();
+
h->action(h);
+
+ if (unlikely(prev_count != preempt_count())) {
+ printk(KERN_ERR "huh, entered softirq %td %p"
+ "with preempt_count %08x,"
+ " exited with %08x?\n", h - softirq_vec,
+ h->action, prev_count, preempt_count());
+ preempt_count() = prev_count;
+ }
+
rcu_bh_qsctr_inc(cpu);
}
h++;
@@ -254,16 +267,12 @@ asmlinkage void do_softirq(void)
*/
void irq_enter(void)
{
-#ifdef CONFIG_NO_HZ
int cpu = smp_processor_id();
+
if (idle_cpu(cpu) && !in_interrupt())
- tick_nohz_stop_idle(cpu);
-#endif
+ tick_check_idle(cpu);
+
__irq_enter();
-#ifdef CONFIG_NO_HZ
- if (idle_cpu(cpu))
- tick_nohz_update_jiffies();
-#endif
}
#ifdef __ARCH_IRQ_EXIT_IRQS_DISABLED
@@ -463,17 +472,144 @@ void tasklet_kill(struct tasklet_struct *t)
EXPORT_SYMBOL(tasklet_kill);
+DEFINE_PER_CPU(struct list_head [NR_SOFTIRQS], softirq_work_list);
+EXPORT_PER_CPU_SYMBOL(softirq_work_list);
+
+static void __local_trigger(struct call_single_data *cp, int softirq)
+{
+ struct list_head *head = &__get_cpu_var(softirq_work_list[softirq]);
+
+ list_add_tail(&cp->list, head);
+
+ /* Trigger the softirq only if the list was previously empty. */
+ if (head->next == &cp->list)
+ raise_softirq_irqoff(softirq);
+}
+
+#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
+static void remote_softirq_receive(void *data)
+{
+ struct call_single_data *cp = data;
+ unsigned long flags;
+ int softirq;
+
+ softirq = cp->priv;
+
+ local_irq_save(flags);
+ __local_trigger(cp, softirq);
+ local_irq_restore(flags);
+}
+
+static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
+{
+ if (cpu_online(cpu)) {
+ cp->func = remote_softirq_receive;
+ cp->info = cp;
+ cp->flags = 0;
+ cp->priv = softirq;
+
+ __smp_call_function_single(cpu, cp);
+ return 0;
+ }
+ return 1;
+}
+#else /* CONFIG_USE_GENERIC_SMP_HELPERS */
+static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
+{
+ return 1;
+}
+#endif
+
+/**
+ * __send_remote_softirq - try to schedule softirq work on a remote cpu
+ * @cp: private SMP call function data area
+ * @cpu: the remote cpu
+ * @this_cpu: the currently executing cpu
+ * @softirq: the softirq for the work
+ *
+ * Attempt to schedule softirq work on a remote cpu. If this cannot be
+ * done, the work is instead queued up on the local cpu.
+ *
+ * Interrupts must be disabled.
+ */
+void __send_remote_softirq(struct call_single_data *cp, int cpu, int this_cpu, int softirq)
+{
+ if (cpu == this_cpu || __try_remote_softirq(cp, cpu, softirq))
+ __local_trigger(cp, softirq);
+}
+EXPORT_SYMBOL(__send_remote_softirq);
+
+/**
+ * send_remote_softirq - try to schedule softirq work on a remote cpu
+ * @cp: private SMP call function data area
+ * @cpu: the remote cpu
+ * @softirq: the softirq for the work
+ *
+ * Like __send_remote_softirq except that disabling interrupts and
+ * computing the current cpu is done for the caller.
+ */
+void send_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
+{
+ unsigned long flags;
+ int this_cpu;
+
+ local_irq_save(flags);
+ this_cpu = smp_processor_id();
+ __send_remote_softirq(cp, cpu, this_cpu, softirq);
+ local_irq_restore(flags);
+}
+EXPORT_SYMBOL(send_remote_softirq);
+
+static int __cpuinit remote_softirq_cpu_notify(struct notifier_block *self,
+ unsigned long action, void *hcpu)
+{
+ /*
+ * If a CPU goes away, splice its entries to the current CPU
+ * and trigger a run of the softirq
+ */
+ if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) {
+ int cpu = (unsigned long) hcpu;
+ int i;
+
+ local_irq_disable();
+ for (i = 0; i < NR_SOFTIRQS; i++) {
+ struct list_head *head = &per_cpu(softirq_work_list[i], cpu);
+ struct list_head *local_head;
+
+ if (list_empty(head))
+ continue;
+
+ local_head = &__get_cpu_var(softirq_work_list[i]);
+ list_splice_init(head, local_head);
+ raise_softirq_irqoff(i);
+ }
+ local_irq_enable();
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata remote_softirq_cpu_notifier = {
+ .notifier_call = remote_softirq_cpu_notify,
+};
+
void __init softirq_init(void)
{
int cpu;
for_each_possible_cpu(cpu) {
+ int i;
+
per_cpu(tasklet_vec, cpu).tail =
&per_cpu(tasklet_vec, cpu).head;
per_cpu(tasklet_hi_vec, cpu).tail =
&per_cpu(tasklet_hi_vec, cpu).head;
+ for (i = 0; i < NR_SOFTIRQS; i++)
+ INIT_LIST_HEAD(&per_cpu(softirq_work_list[i], cpu));
}
+ register_hotcpu_notifier(&remote_softirq_cpu_notifier);
+
open_softirq(TASKLET_SOFTIRQ, tasklet_action);
open_softirq(HI_SOFTIRQ, tasklet_hi_action);
}
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index cb838ee93a8..3953e4aed73 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -226,7 +226,7 @@ static void check_hung_uninterruptible_tasks(int this_cpu)
* If the system crashed already then all bets are off,
* do not report extra hung tasks:
*/
- if ((tainted & TAINT_DIE) || did_panic)
+ if (test_taint(TAINT_DIE) || did_panic)
return;
read_lock(&tasklist_lock);
diff --git a/kernel/sys.c b/kernel/sys.c
index 038a7bc0901..53879cdae48 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -853,38 +853,28 @@ asmlinkage long sys_setfsgid(gid_t gid)
return old_fsgid;
}
+void do_sys_times(struct tms *tms)
+{
+ struct task_cputime cputime;
+ cputime_t cutime, cstime;
+
+ spin_lock_irq(&current->sighand->siglock);
+ thread_group_cputime(current, &cputime);
+ cutime = current->signal->cutime;
+ cstime = current->signal->cstime;
+ spin_unlock_irq(&current->sighand->siglock);
+ tms->tms_utime = cputime_to_clock_t(cputime.utime);
+ tms->tms_stime = cputime_to_clock_t(cputime.stime);
+ tms->tms_cutime = cputime_to_clock_t(cutime);
+ tms->tms_cstime = cputime_to_clock_t(cstime);
+}
+
asmlinkage long sys_times(struct tms __user * tbuf)
{
- /*
- * In the SMP world we might just be unlucky and have one of
- * the times increment as we use it. Since the value is an
- * atomically safe type this is just fine. Conceptually its
- * as if the syscall took an instant longer to occur.
- */
if (tbuf) {
struct tms tmp;
- struct task_struct *tsk = current;
- struct task_struct *t;
- cputime_t utime, stime, cutime, cstime;
-
- spin_lock_irq(&tsk->sighand->siglock);
- utime = tsk->signal->utime;
- stime = tsk->signal->stime;
- t = tsk;
- do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- t = next_thread(t);
- } while (t != tsk);
-
- cutime = tsk->signal->cutime;
- cstime = tsk->signal->cstime;
- spin_unlock_irq(&tsk->sighand->siglock);
-
- tmp.tms_utime = cputime_to_clock_t(utime);
- tmp.tms_stime = cputime_to_clock_t(stime);
- tmp.tms_cutime = cputime_to_clock_t(cutime);
- tmp.tms_cstime = cputime_to_clock_t(cstime);
+
+ do_sys_times(&tmp);
if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
return -EFAULT;
}
@@ -1060,9 +1050,7 @@ asmlinkage long sys_setsid(void)
group_leader->signal->leader = 1;
__set_special_pids(sid);
- spin_lock(&group_leader->sighand->siglock);
- group_leader->signal->tty = NULL;
- spin_unlock(&group_leader->sighand->siglock);
+ proc_clear_tty(group_leader);
err = session;
out:
@@ -1351,8 +1339,10 @@ asmlinkage long sys_sethostname(char __user *name, int len)
down_write(&uts_sem);
errno = -EFAULT;
if (!copy_from_user(tmp, name, len)) {
- memcpy(utsname()->nodename, tmp, len);
- utsname()->nodename[len] = 0;
+ struct new_utsname *u = utsname();
+
+ memcpy(u->nodename, tmp, len);
+ memset(u->nodename + len, 0, sizeof(u->nodename) - len);
errno = 0;
}
up_write(&uts_sem);
@@ -1364,15 +1354,17 @@ asmlinkage long sys_sethostname(char __user *name, int len)
asmlinkage long sys_gethostname(char __user *name, int len)
{
int i, errno;
+ struct new_utsname *u;
if (len < 0)
return -EINVAL;
down_read(&uts_sem);
- i = 1 + strlen(utsname()->nodename);
+ u = utsname();
+ i = 1 + strlen(u->nodename);
if (i > len)
i = len;
errno = 0;
- if (copy_to_user(name, utsname()->nodename, i))
+ if (copy_to_user(name, u->nodename, i))
errno = -EFAULT;
up_read(&uts_sem);
return errno;
@@ -1397,8 +1389,10 @@ asmlinkage long sys_setdomainname(char __user *name, int len)
down_write(&uts_sem);
errno = -EFAULT;
if (!copy_from_user(tmp, name, len)) {
- memcpy(utsname()->domainname, tmp, len);
- utsname()->domainname[len] = 0;
+ struct new_utsname *u = utsname();
+
+ memcpy(u->domainname, tmp, len);
+ memset(u->domainname + len, 0, sizeof(u->domainname) - len);
errno = 0;
}
up_write(&uts_sem);
@@ -1445,21 +1439,28 @@ asmlinkage long sys_old_getrlimit(unsigned int resource, struct rlimit __user *r
asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
{
struct rlimit new_rlim, *old_rlim;
- unsigned long it_prof_secs;
int retval;
if (resource >= RLIM_NLIMITS)
return -EINVAL;
if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
return -EFAULT;
- if (new_rlim.rlim_cur > new_rlim.rlim_max)
- return -EINVAL;
old_rlim = current->signal->rlim + resource;
if ((new_rlim.rlim_max > old_rlim->rlim_max) &&
!capable(CAP_SYS_RESOURCE))
return -EPERM;
- if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
- return -EPERM;
+
+ if (resource == RLIMIT_NOFILE) {
+ if (new_rlim.rlim_max == RLIM_INFINITY)
+ new_rlim.rlim_max = sysctl_nr_open;
+ if (new_rlim.rlim_cur == RLIM_INFINITY)
+ new_rlim.rlim_cur = sysctl_nr_open;
+ if (new_rlim.rlim_max > sysctl_nr_open)
+ return -EPERM;
+ }
+
+ if (new_rlim.rlim_cur > new_rlim.rlim_max)
+ return -EINVAL;
retval = security_task_setrlimit(resource, &new_rlim);
if (retval)
@@ -1491,18 +1492,7 @@ asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
if (new_rlim.rlim_cur == RLIM_INFINITY)
goto out;
- it_prof_secs = cputime_to_secs(current->signal->it_prof_expires);
- if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) {
- unsigned long rlim_cur = new_rlim.rlim_cur;
- cputime_t cputime;
-
- cputime = secs_to_cputime(rlim_cur);
- read_lock(&tasklist_lock);
- spin_lock_irq(&current->sighand->siglock);
- set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
- spin_unlock_irq(&current->sighand->siglock);
- read_unlock(&tasklist_lock);
- }
+ update_rlimit_cpu(new_rlim.rlim_cur);
out:
return 0;
}
@@ -1540,11 +1530,8 @@ out:
*
*/
-static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r,
- cputime_t *utimep, cputime_t *stimep)
+static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
{
- *utimep = cputime_add(*utimep, t->utime);
- *stimep = cputime_add(*stimep, t->stime);
r->ru_nvcsw += t->nvcsw;
r->ru_nivcsw += t->nivcsw;
r->ru_minflt += t->min_flt;
@@ -1558,12 +1545,13 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
struct task_struct *t;
unsigned long flags;
cputime_t utime, stime;
+ struct task_cputime cputime;
memset((char *) r, 0, sizeof *r);
utime = stime = cputime_zero;
if (who == RUSAGE_THREAD) {
- accumulate_thread_rusage(p, r, &utime, &stime);
+ accumulate_thread_rusage(p, r);
goto out;
}
@@ -1586,8 +1574,9 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
break;
case RUSAGE_SELF:
- utime = cputime_add(utime, p->signal->utime);
- stime = cputime_add(stime, p->signal->stime);
+ thread_group_cputime(p, &cputime);
+ utime = cputime_add(utime, cputime.utime);
+ stime = cputime_add(stime, cputime.stime);
r->ru_nvcsw += p->signal->nvcsw;
r->ru_nivcsw += p->signal->nivcsw;
r->ru_minflt += p->signal->min_flt;
@@ -1596,7 +1585,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
r->ru_oublock += p->signal->oublock;
t = p;
do {
- accumulate_thread_rusage(t, r, &utime, &stime);
+ accumulate_thread_rusage(t, r);
t = next_thread(t);
} while (t != p);
break;
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 08d6e1bb99a..a77b27b11b0 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -125,6 +125,12 @@ cond_syscall(sys_vm86old);
cond_syscall(sys_vm86);
cond_syscall(compat_sys_ipc);
cond_syscall(compat_sys_sysctl);
+cond_syscall(sys_flock);
+cond_syscall(sys_io_setup);
+cond_syscall(sys_io_destroy);
+cond_syscall(sys_io_submit);
+cond_syscall(sys_io_cancel);
+cond_syscall(sys_io_getevents);
/* arch-specific weak syscall entries */
cond_syscall(sys_pciconfig_read);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 50ec0886fa3..b3cc73931d1 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -80,7 +80,6 @@ extern int pid_max_min, pid_max_max;
extern int sysctl_drop_caches;
extern int percpu_pagelist_fraction;
extern int compat_log;
-extern int maps_protect;
extern int latencytop_enabled;
extern int sysctl_nr_open_min, sysctl_nr_open_max;
#ifdef CONFIG_RCU_TORTURE_TEST
@@ -97,7 +96,7 @@ static int sixty = 60;
static int neg_one = -1;
#endif
-#ifdef CONFIG_MMU
+#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
static int two = 2;
#endif
@@ -118,10 +117,8 @@ extern char modprobe_path[];
extern int sg_big_buff;
#endif
-#ifdef __sparc__
-extern char reboot_command [];
-extern int stop_a_enabled;
-extern int scons_pwroff;
+#ifdef CONFIG_SPARC
+#include <asm/system.h>
#endif
#ifdef __hppa__
@@ -152,7 +149,7 @@ extern int max_lock_depth;
#ifdef CONFIG_PROC_SYSCTL
static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
-static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
+static int proc_taint(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
@@ -382,10 +379,9 @@ static struct ctl_table kern_table[] = {
#ifdef CONFIG_PROC_SYSCTL
{
.procname = "tainted",
- .data = &tainted,
- .maxlen = sizeof(int),
+ .maxlen = sizeof(long),
.mode = 0644,
- .proc_handler = &proc_dointvec_taint,
+ .proc_handler = &proc_taint,
},
#endif
#ifdef CONFIG_LATENCYTOP
@@ -415,7 +411,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
-#ifdef __sparc__
+#ifdef CONFIG_SPARC
{
.ctl_name = KERN_SPARC_REBOOT,
.procname = "reboot-cmd",
@@ -810,16 +806,6 @@ static struct ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
-#ifdef CONFIG_PROC_FS
- {
- .ctl_name = CTL_UNNUMBERED,
- .procname = "maps_protect",
- .data = &maps_protect,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
-#endif
{
.ctl_name = CTL_UNNUMBERED,
.procname = "poweroff_cmd",
@@ -847,6 +833,16 @@ static struct ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
+#ifdef CONFIG_UNEVICTABLE_LRU
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "scan_unevictable_pages",
+ .data = &scan_unevictable_pages,
+ .maxlen = sizeof(scan_unevictable_pages),
+ .mode = 0644,
+ .proc_handler = &scan_unevictable_handler,
+ },
+#endif
/*
* NOTE: do not add new entries to this table unless you have read
* Documentation/sysctl/ctl_unnumbered.txt
@@ -1261,6 +1257,7 @@ static struct ctl_table fs_table[] = {
.extra1 = &minolduid,
.extra2 = &maxolduid,
},
+#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASES,
.procname = "leases-enable",
@@ -1269,6 +1266,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+#endif
#ifdef CONFIG_DNOTIFY
{
.ctl_name = FS_DIR_NOTIFY,
@@ -1280,6 +1278,7 @@ static struct ctl_table fs_table[] = {
},
#endif
#ifdef CONFIG_MMU
+#ifdef CONFIG_FILE_LOCKING
{
.ctl_name = FS_LEASE_TIME,
.procname = "lease-break-time",
@@ -1291,6 +1290,8 @@ static struct ctl_table fs_table[] = {
.extra1 = &zero,
.extra2 = &two,
},
+#endif
+#ifdef CONFIG_AIO
{
.procname = "aio-nr",
.data = &aio_nr,
@@ -1305,6 +1306,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = &proc_doulongvec_minmax,
},
+#endif /* CONFIG_AIO */
#ifdef CONFIG_INOTIFY_USER
{
.ctl_name = FS_INOTIFY,
@@ -1510,7 +1512,6 @@ void register_sysctl_root(struct ctl_table_root *root)
/* Perform the actual read/write of a sysctl table entry. */
static int do_sysctl_strategy(struct ctl_table_root *root,
struct ctl_table *table,
- int __user *name, int nlen,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -1524,8 +1525,7 @@ static int do_sysctl_strategy(struct ctl_table_root *root,
return -EPERM;
if (table->strategy) {
- rc = table->strategy(table, name, nlen, oldval, oldlenp,
- newval, newlen);
+ rc = table->strategy(table, oldval, oldlenp, newval, newlen);
if (rc < 0)
return rc;
if (rc > 0)
@@ -1535,8 +1535,7 @@ static int do_sysctl_strategy(struct ctl_table_root *root,
/* If there is no strategy routine, or if the strategy returns
* zero, proceed with automatic r/w */
if (table->data && table->maxlen) {
- rc = sysctl_data(table, name, nlen, oldval, oldlenp,
- newval, newlen);
+ rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
if (rc < 0)
return rc;
}
@@ -1568,7 +1567,7 @@ repeat:
table = table->child;
goto repeat;
}
- error = do_sysctl_strategy(root, table, name, nlen,
+ error = do_sysctl_strategy(root, table,
oldval, oldlenp,
newval, newlen);
return error;
@@ -2237,49 +2236,39 @@ int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
NULL,NULL);
}
-#define OP_SET 0
-#define OP_AND 1
-#define OP_OR 2
-
-static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
- int *valp,
- int write, void *data)
-{
- int op = *(int *)data;
- if (write) {
- int val = *negp ? -*lvalp : *lvalp;
- switch(op) {
- case OP_SET: *valp = val; break;
- case OP_AND: *valp &= val; break;
- case OP_OR: *valp |= val; break;
- }
- } else {
- int val = *valp;
- if (val < 0) {
- *negp = -1;
- *lvalp = (unsigned long)-val;
- } else {
- *negp = 0;
- *lvalp = (unsigned long)val;
- }
- }
- return 0;
-}
-
/*
- * Taint values can only be increased
+ * Taint values can only be increased
+ * This means we can safely use a temporary.
*/
-static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
+static int proc_taint(struct ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
- int op;
+ struct ctl_table t;
+ unsigned long tmptaint = get_taint();
+ int err;
if (write && !capable(CAP_SYS_ADMIN))
return -EPERM;
- op = OP_OR;
- return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
- do_proc_dointvec_bset_conv,&op);
+ t = *table;
+ t.data = &tmptaint;
+ err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
+ if (err < 0)
+ return err;
+
+ if (write) {
+ /*
+ * Poor man's atomic or. Not worth adding a primitive
+ * to everyone's atomic.h for this
+ */
+ int i;
+ for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
+ if ((tmptaint >> i) & 1)
+ add_taint(i);
+ }
+ }
+
+ return err;
}
struct do_proc_dointvec_minmax_conv_param {
@@ -2727,7 +2716,7 @@ int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
*/
/* The generic sysctl data routine (used if no strategy routine supplied) */
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2761,7 +2750,7 @@ int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
}
/* The generic string strategy routine: */
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2807,7 +2796,7 @@ int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
* are between the minimum and maximum values given in the arrays
* table->extra1 and table->extra2, respectively.
*/
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2843,7 +2832,7 @@ int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
}
/* Strategy function to convert jiffies to seconds */
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2877,7 +2866,7 @@ int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
}
/* Strategy function to convert jiffies to seconds */
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -2932,35 +2921,35 @@ asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
return error;
}
-int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_data(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_string(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_intvec(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
return -ENOSYS;
}
-int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
+int sysctl_ms_jiffies(struct ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 8d53106a0a9..95ed42951e0 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -3,7 +3,6 @@
#
config TICK_ONESHOT
bool
- default n
config NO_HZ
bool "Tickless System (Dynamic Ticks)"
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 093d4acf993..9ed2eec9752 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -325,6 +325,9 @@ int clocksource_register(struct clocksource *c)
unsigned long flags;
int ret;
+ /* save mult_orig on registration */
+ c->mult_orig = c->mult;
+
spin_lock_irqsave(&clocksource_lock, flags);
ret = clocksource_enqueue(c);
if (!ret)
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 4c256fdb887..1ca99557e92 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -61,6 +61,7 @@ struct clocksource clocksource_jiffies = {
.read = jiffies_read,
.mask = 0xffffffff, /*32bits*/
.mult = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
+ .mult_orig = NSEC_PER_JIFFY << JIFFIES_SHIFT,
.shift = JIFFIES_SHIFT,
};
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index 1ad46f3df6e..1a20715bfd6 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -10,13 +10,13 @@
#include <linux/mm.h>
#include <linux/time.h>
-#include <linux/timer.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
#include <linux/hrtimer.h>
#include <linux/capability.h>
#include <linux/math64.h>
#include <linux/clocksource.h>
+#include <linux/workqueue.h>
#include <asm/timex.h>
/*
@@ -218,11 +218,11 @@ void second_overflow(void)
/* Disable the cmos update - used by virtualization and embedded */
int no_sync_cmos_clock __read_mostly;
-static void sync_cmos_clock(unsigned long dummy);
+static void sync_cmos_clock(struct work_struct *work);
-static DEFINE_TIMER(sync_cmos_timer, sync_cmos_clock, 0, 0);
+static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
-static void sync_cmos_clock(unsigned long dummy)
+static void sync_cmos_clock(struct work_struct *work)
{
struct timespec now, next;
int fail = 1;
@@ -258,13 +258,13 @@ static void sync_cmos_clock(unsigned long dummy)
next.tv_sec++;
next.tv_nsec -= NSEC_PER_SEC;
}
- mod_timer(&sync_cmos_timer, jiffies + timespec_to_jiffies(&next));
+ schedule_delayed_work(&sync_cmos_work, timespec_to_jiffies(&next));
}
static void notify_cmos_timer(void)
{
if (!no_sync_cmos_clock)
- mod_timer(&sync_cmos_timer, jiffies + 1);
+ schedule_delayed_work(&sync_cmos_work, 0);
}
#else
@@ -277,38 +277,50 @@ static inline void notify_cmos_timer(void) { }
int do_adjtimex(struct timex *txc)
{
struct timespec ts;
- long save_adjust, sec;
int result;
- /* In order to modify anything, you gotta be super-user! */
- if (txc->modes && !capable(CAP_SYS_TIME))
- return -EPERM;
-
- /* Now we validate the data before disabling interrupts */
-
- if ((txc->modes & ADJ_OFFSET_SINGLESHOT) == ADJ_OFFSET_SINGLESHOT) {
+ /* Validate the data before disabling interrupts */
+ if (txc->modes & ADJ_ADJTIME) {
/* singleshot must not be used with any other mode bits */
- if (txc->modes & ~ADJ_OFFSET_SS_READ)
+ if (!(txc->modes & ADJ_OFFSET_SINGLESHOT))
return -EINVAL;
+ if (!(txc->modes & ADJ_OFFSET_READONLY) &&
+ !capable(CAP_SYS_TIME))
+ return -EPERM;
+ } else {
+ /* In order to modify anything, you gotta be super-user! */
+ if (txc->modes && !capable(CAP_SYS_TIME))
+ return -EPERM;
+
+ /* if the quartz is off by more than 10% something is VERY wrong! */
+ if (txc->modes & ADJ_TICK &&
+ (txc->tick < 900000/USER_HZ ||
+ txc->tick > 1100000/USER_HZ))
+ return -EINVAL;
+
+ if (txc->modes & ADJ_STATUS && time_state != TIME_OK)
+ hrtimer_cancel(&leap_timer);
}
- /* if the quartz is off by more than 10% something is VERY wrong ! */
- if (txc->modes & ADJ_TICK)
- if (txc->tick < 900000/USER_HZ ||
- txc->tick > 1100000/USER_HZ)
- return -EINVAL;
-
- if (time_state != TIME_OK && txc->modes & ADJ_STATUS)
- hrtimer_cancel(&leap_timer);
getnstimeofday(&ts);
write_seqlock_irq(&xtime_lock);
- /* Save for later - semantics of adjtime is to return old value */
- save_adjust = time_adjust;
-
/* If there are input parameters, then process them */
+ if (txc->modes & ADJ_ADJTIME) {
+ long save_adjust = time_adjust;
+
+ if (!(txc->modes & ADJ_OFFSET_READONLY)) {
+ /* adjtime() is independent from ntp_adjtime() */
+ time_adjust = txc->offset;
+ ntp_update_frequency();
+ }
+ txc->offset = save_adjust;
+ goto adj_done;
+ }
if (txc->modes) {
+ long sec;
+
if (txc->modes & ADJ_STATUS) {
if ((time_status & STA_PLL) &&
!(txc->status & STA_PLL)) {
@@ -375,13 +387,8 @@ int do_adjtimex(struct timex *txc)
if (txc->modes & ADJ_TAI && txc->constant > 0)
time_tai = txc->constant;
- if (txc->modes & ADJ_OFFSET) {
- if (txc->modes == ADJ_OFFSET_SINGLESHOT)
- /* adjtime() is independent from ntp_adjtime() */
- time_adjust = txc->offset;
- else
- ntp_update_offset(txc->offset);
- }
+ if (txc->modes & ADJ_OFFSET)
+ ntp_update_offset(txc->offset);
if (txc->modes & ADJ_TICK)
tick_usec = txc->tick;
@@ -389,22 +396,18 @@ int do_adjtimex(struct timex *txc)
ntp_update_frequency();
}
+ txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
+ NTP_SCALE_SHIFT);
+ if (!(time_status & STA_NANO))
+ txc->offset /= NSEC_PER_USEC;
+
+adj_done:
result = time_state; /* mostly `TIME_OK' */
if (time_status & (STA_UNSYNC|STA_CLOCKERR))
result = TIME_ERROR;
- if ((txc->modes == ADJ_OFFSET_SINGLESHOT) ||
- (txc->modes == ADJ_OFFSET_SS_READ))
- txc->offset = save_adjust;
- else {
- txc->offset = shift_right(time_offset * NTP_INTERVAL_FREQ,
- NTP_SCALE_SHIFT);
- if (!(time_status & STA_NANO))
- txc->offset /= NSEC_PER_USEC;
- }
- txc->freq = shift_right((s32)(time_freq >> PPM_SCALE_INV_SHIFT) *
- (s64)PPM_SCALE_INV,
- NTP_SCALE_SHIFT);
+ txc->freq = shift_right((time_freq >> PPM_SCALE_INV_SHIFT) *
+ (s64)PPM_SCALE_INV, NTP_SCALE_SHIFT);
txc->maxerror = time_maxerror;
txc->esterror = time_esterror;
txc->status = time_status;
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index cb01cd8f919..f98a1b7b16e 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -384,6 +384,19 @@ int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
}
/*
+ * Called from irq_enter() when idle was interrupted to reenable the
+ * per cpu device.
+ */
+void tick_check_oneshot_broadcast(int cpu)
+{
+ if (cpu_isset(cpu, tick_broadcast_oneshot_mask)) {
+ struct tick_device *td = &per_cpu(tick_cpu_device, cpu);
+
+ clockevents_set_mode(td->evtdev, CLOCK_EVT_MODE_ONESHOT);
+ }
+}
+
+/*
* Handle oneshot mode broadcasting
*/
static void tick_handle_oneshot_broadcast(struct clock_event_device *dev)
diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h
index 469248782c2..b1c05bf75ee 100644
--- a/kernel/time/tick-internal.h
+++ b/kernel/time/tick-internal.h
@@ -36,6 +36,7 @@ extern void tick_broadcast_switch_to_oneshot(void);
extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
extern int tick_broadcast_oneshot_active(void);
+extern void tick_check_oneshot_broadcast(int cpu);
# else /* BROADCAST */
static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
{
@@ -45,6 +46,7 @@ static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
static inline void tick_broadcast_switch_to_oneshot(void) { }
static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
static inline int tick_broadcast_oneshot_active(void) { return 0; }
+static inline void tick_check_oneshot_broadcast(int cpu) { }
# endif /* !BROADCAST */
#else /* !ONESHOT */
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index cb02324bdb8..0581c11fe6c 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -20,6 +20,7 @@
#include <linux/profile.h>
#include <linux/sched.h>
#include <linux/tick.h>
+#include <linux/module.h>
#include <asm/irq_regs.h>
@@ -154,7 +155,7 @@ void tick_nohz_update_jiffies(void)
touch_softlockup_watchdog();
}
-void tick_nohz_stop_idle(int cpu)
+static void tick_nohz_stop_idle(int cpu)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
@@ -190,9 +191,17 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
{
struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
- *last_update_time = ktime_to_us(ts->idle_lastupdate);
+ if (!tick_nohz_enabled)
+ return -1;
+
+ if (ts->idle_active)
+ *last_update_time = ktime_to_us(ts->idle_lastupdate);
+ else
+ *last_update_time = ktime_to_us(ktime_get());
+
return ktime_to_us(ts->idle_sleeptime);
}
+EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
/**
* tick_nohz_stop_sched_tick - stop the idle tick from the idle task
@@ -261,7 +270,7 @@ void tick_nohz_stop_sched_tick(int inidle)
next_jiffies = get_next_timer_interrupt(last_jiffies);
delta_jiffies = next_jiffies - last_jiffies;
- if (rcu_needs_cpu(cpu))
+ if (rcu_needs_cpu(cpu) || printk_needs_cpu(cpu))
delta_jiffies = 1;
/*
* Do not stop the tick, if we are only one off
@@ -368,6 +377,32 @@ ktime_t tick_nohz_get_sleep_length(void)
return ts->sleep_length;
}
+static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
+{
+ hrtimer_cancel(&ts->sched_timer);
+ ts->sched_timer.expires = ts->idle_tick;
+
+ while (1) {
+ /* Forward the time to expire in the future */
+ hrtimer_forward(&ts->sched_timer, now, tick_period);
+
+ if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
+ hrtimer_start(&ts->sched_timer,
+ ts->sched_timer.expires,
+ HRTIMER_MODE_ABS);
+ /* Check, if the timer was already in the past */
+ if (hrtimer_active(&ts->sched_timer))
+ break;
+ } else {
+ if (!tick_program_event(ts->sched_timer.expires, 0))
+ break;
+ }
+ /* Update jiffies and reread time */
+ tick_do_update_jiffies64(now);
+ now = ktime_get();
+ }
+}
+
/**
* tick_nohz_restart_sched_tick - restart the idle tick from the idle task
*
@@ -421,28 +456,7 @@ void tick_nohz_restart_sched_tick(void)
*/
ts->tick_stopped = 0;
ts->idle_exittime = now;
- hrtimer_cancel(&ts->sched_timer);
- ts->sched_timer.expires = ts->idle_tick;
-
- while (1) {
- /* Forward the time to expire in the future */
- hrtimer_forward(&ts->sched_timer, now, tick_period);
-
- if (ts->nohz_mode == NOHZ_MODE_HIGHRES) {
- hrtimer_start(&ts->sched_timer,
- ts->sched_timer.expires,
- HRTIMER_MODE_ABS);
- /* Check, if the timer was already in the past */
- if (hrtimer_active(&ts->sched_timer))
- break;
- } else {
- if (!tick_program_event(ts->sched_timer.expires, 0))
- break;
- }
- /* Update jiffies and reread time */
- tick_do_update_jiffies64(now);
- now = ktime_get();
- }
+ tick_nohz_restart(ts, now);
local_irq_enable();
}
@@ -494,10 +508,6 @@ static void tick_nohz_handler(struct clock_event_device *dev)
update_process_times(user_mode(regs));
profile_tick(CPU_PROFILING);
- /* Do not restart, when we are in the idle loop */
- if (ts->tick_stopped)
- return;
-
while (tick_nohz_reprogram(ts, now)) {
now = ktime_get();
tick_do_update_jiffies64(now);
@@ -543,6 +553,27 @@ static void tick_nohz_switch_to_nohz(void)
smp_processor_id());
}
+/*
+ * When NOHZ is enabled and the tick is stopped, we need to kick the
+ * tick timer from irq_enter() so that the jiffies update is kept
+ * alive during long running softirqs. That's ugly as hell, but
+ * correctness is key even if we need to fix the offending softirq in
+ * the first place.
+ *
+ * Note, this is different to tick_nohz_restart. We just kick the
+ * timer and do not touch the other magic bits which need to be done
+ * when idle is left.
+ */
+static void tick_nohz_kick_tick(int cpu)
+{
+ struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+
+ if (!ts->tick_stopped)
+ return;
+
+ tick_nohz_restart(ts, ktime_get());
+}
+
#else
static inline void tick_nohz_switch_to_nohz(void) { }
@@ -550,6 +581,19 @@ static inline void tick_nohz_switch_to_nohz(void) { }
#endif /* NO_HZ */
/*
+ * Called from irq_enter to notify about the possible interruption of idle()
+ */
+void tick_check_idle(int cpu)
+{
+ tick_check_oneshot_broadcast(cpu);
+#ifdef CONFIG_NO_HZ
+ tick_nohz_stop_idle(cpu);
+ tick_nohz_update_jiffies();
+ tick_nohz_kick_tick(cpu);
+#endif
+}
+
+/*
* High resolution timer specific code
*/
#ifdef CONFIG_HIGH_RES_TIMERS
@@ -602,10 +646,6 @@ static enum hrtimer_restart tick_sched_timer(struct hrtimer *timer)
profile_tick(CPU_PROFILING);
}
- /* Do not restart, when we are in the idle loop */
- if (ts->tick_stopped)
- return HRTIMER_NORESTART;
-
hrtimer_forward(timer, now, tick_period);
return HRTIMER_RESTART;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index e91c29f961c..e7acfb482a6 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -58,27 +58,26 @@ struct clocksource *clock;
#ifdef CONFIG_GENERIC_TIME
/**
- * __get_nsec_offset - Returns nanoseconds since last call to periodic_hook
+ * clocksource_forward_now - update clock to the current time
*
- * private function, must hold xtime_lock lock when being
- * called. Returns the number of nanoseconds since the
- * last call to update_wall_time() (adjusted by NTP scaling)
+ * Forward the current clock to update its state since the last call to
+ * update_wall_time(). This is useful before significant clock changes,
+ * as it avoids having to deal with this time offset explicitly.
*/
-static inline s64 __get_nsec_offset(void)
+static void clocksource_forward_now(void)
{
cycle_t cycle_now, cycle_delta;
- s64 ns_offset;
+ s64 nsec;
- /* read clocksource: */
cycle_now = clocksource_read(clock);
-
- /* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+ clock->cycle_last = cycle_now;
- /* convert to nanoseconds: */
- ns_offset = cyc2ns(clock, cycle_delta);
+ nsec = cyc2ns(clock, cycle_delta);
+ timespec_add_ns(&xtime, nsec);
- return ns_offset;
+ nsec = ((s64)cycle_delta * clock->mult_orig) >> clock->shift;
+ clock->raw_time.tv_nsec += nsec;
}
/**
@@ -89,6 +88,7 @@ static inline s64 __get_nsec_offset(void)
*/
void getnstimeofday(struct timespec *ts)
{
+ cycle_t cycle_now, cycle_delta;
unsigned long seq;
s64 nsecs;
@@ -96,7 +96,15 @@ void getnstimeofday(struct timespec *ts)
seq = read_seqbegin(&xtime_lock);
*ts = xtime;
- nsecs = __get_nsec_offset();
+
+ /* read clocksource: */
+ cycle_now = clocksource_read(clock);
+
+ /* calculate the delta since the last update_wall_time: */
+ cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+
+ /* convert to nanoseconds: */
+ nsecs = cyc2ns(clock, cycle_delta);
} while (read_seqretry(&xtime_lock, seq));
@@ -129,22 +137,22 @@ EXPORT_SYMBOL(do_gettimeofday);
*/
int do_settimeofday(struct timespec *tv)
{
+ struct timespec ts_delta;
unsigned long flags;
- time_t wtm_sec, sec = tv->tv_sec;
- long wtm_nsec, nsec = tv->tv_nsec;
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irqsave(&xtime_lock, flags);
- nsec -= __get_nsec_offset();
+ clocksource_forward_now();
+
+ ts_delta.tv_sec = tv->tv_sec - xtime.tv_sec;
+ ts_delta.tv_nsec = tv->tv_nsec - xtime.tv_nsec;
+ wall_to_monotonic = timespec_sub(wall_to_monotonic, ts_delta);
- wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
- wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
+ xtime = *tv;
- set_normalized_timespec(&xtime, sec, nsec);
- set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
update_xtime_cache(0);
clock->error = 0;
@@ -170,22 +178,19 @@ EXPORT_SYMBOL(do_settimeofday);
static void change_clocksource(void)
{
struct clocksource *new;
- cycle_t now;
- u64 nsec;
new = clocksource_get_next();
if (clock == new)
return;
- new->cycle_last = 0;
- now = clocksource_read(new);
- nsec = __get_nsec_offset();
- timespec_add_ns(&xtime, nsec);
+ clocksource_forward_now();
- clock = new;
- clock->cycle_last = now;
+ new->raw_time = clock->raw_time;
+ clock = new;
+ clock->cycle_last = 0;
+ clock->cycle_last = clocksource_read(new);
clock->error = 0;
clock->xtime_nsec = 0;
clocksource_calculate_interval(clock, NTP_INTERVAL_LENGTH);
@@ -200,11 +205,44 @@ static void change_clocksource(void)
*/
}
#else
+static inline void clocksource_forward_now(void) { }
static inline void change_clocksource(void) { }
-static inline s64 __get_nsec_offset(void) { return 0; }
#endif
/**
+ * getrawmonotonic - Returns the raw monotonic time in a timespec
+ * @ts: pointer to the timespec to be set
+ *
+ * Returns the raw monotonic time (completely un-modified by ntp)
+ */
+void getrawmonotonic(struct timespec *ts)
+{
+ unsigned long seq;
+ s64 nsecs;
+ cycle_t cycle_now, cycle_delta;
+
+ do {
+ seq = read_seqbegin(&xtime_lock);
+
+ /* read clocksource: */
+ cycle_now = clocksource_read(clock);
+
+ /* calculate the delta since the last update_wall_time: */
+ cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+
+ /* convert to nanoseconds: */
+ nsecs = ((s64)cycle_delta * clock->mult_orig) >> clock->shift;
+
+ *ts = clock->raw_time;
+
+ } while (read_seqretry(&xtime_lock, seq));
+
+ timespec_add_ns(ts, nsecs);
+}
+EXPORT_SYMBOL(getrawmonotonic);
+
+
+/**
* timekeeping_valid_for_hres - Check if timekeeping is suitable for hres
*/
int timekeeping_valid_for_hres(void)
@@ -265,8 +303,6 @@ void __init timekeeping_init(void)
static int timekeeping_suspended;
/* time in seconds when suspend began */
static unsigned long timekeeping_suspend_time;
-/* xtime offset when we went into suspend */
-static s64 timekeeping_suspend_nsecs;
/**
* timekeeping_resume - Resumes the generic timekeeping subsystem.
@@ -292,8 +328,6 @@ static int timekeeping_resume(struct sys_device *dev)
wall_to_monotonic.tv_sec -= sleep_length;
total_sleep_time += sleep_length;
}
- /* Make sure that we have the correct xtime reference */
- timespec_add_ns(&xtime, timekeeping_suspend_nsecs);
update_xtime_cache(0);
/* re-base the last cycle value */
clock->cycle_last = 0;
@@ -319,8 +353,7 @@ static int timekeeping_suspend(struct sys_device *dev, pm_message_t state)
timekeeping_suspend_time = read_persistent_clock();
write_seqlock_irqsave(&xtime_lock, flags);
- /* Get the current xtime offset */
- timekeeping_suspend_nsecs = __get_nsec_offset();
+ clocksource_forward_now();
timekeeping_suspended = 1;
write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -454,23 +487,29 @@ void update_wall_time(void)
#else
offset = clock->cycle_interval;
#endif
- clock->xtime_nsec += (s64)xtime.tv_nsec << clock->shift;
+ clock->xtime_nsec = (s64)xtime.tv_nsec << clock->shift;
/* normally this loop will run just once, however in the
* case of lost or late ticks, it will accumulate correctly.
*/
while (offset >= clock->cycle_interval) {
/* accumulate one interval */
- clock->xtime_nsec += clock->xtime_interval;
- clock->cycle_last += clock->cycle_interval;
offset -= clock->cycle_interval;
+ clock->cycle_last += clock->cycle_interval;
+ clock->xtime_nsec += clock->xtime_interval;
if (clock->xtime_nsec >= (u64)NSEC_PER_SEC << clock->shift) {
clock->xtime_nsec -= (u64)NSEC_PER_SEC << clock->shift;
xtime.tv_sec++;
second_overflow();
}
+ clock->raw_time.tv_nsec += clock->raw_interval;
+ if (clock->raw_time.tv_nsec >= NSEC_PER_SEC) {
+ clock->raw_time.tv_nsec -= NSEC_PER_SEC;
+ clock->raw_time.tv_sec++;
+ }
+
/* accumulate error between NTP and clock interval */
clock->error += tick_length;
clock->error -= clock->xtime_interval << (NTP_SCALE_SHIFT - clock->shift);
@@ -479,9 +518,12 @@ void update_wall_time(void)
/* correct the clock when NTP error is too big */
clocksource_adjust(offset);
- /* store full nanoseconds into xtime */
- xtime.tv_nsec = (s64)clock->xtime_nsec >> clock->shift;
+ /* store full nanoseconds into xtime after rounding it up and
+ * add the remainder to the error difference.
+ */
+ xtime.tv_nsec = ((s64)clock->xtime_nsec >> clock->shift) + 1;
clock->xtime_nsec -= (s64)xtime.tv_nsec << clock->shift;
+ clock->error += clock->xtime_nsec << (NTP_SCALE_SHIFT - clock->shift);
update_xtime_cache(cyc2ns(clock, offset));
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index a40e20fd000..f6426911e35 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -47,13 +47,14 @@ static void print_name_offset(struct seq_file *m, void *sym)
}
static void
-print_timer(struct seq_file *m, struct hrtimer *timer, int idx, u64 now)
+print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer,
+ int idx, u64 now)
{
#ifdef CONFIG_TIMER_STATS
char tmp[TASK_COMM_LEN + 1];
#endif
SEQ_printf(m, " #%d: ", idx);
- print_name_offset(m, timer);
+ print_name_offset(m, taddr);
SEQ_printf(m, ", ");
print_name_offset(m, timer->function);
SEQ_printf(m, ", S:%02lx", timer->state);
@@ -99,7 +100,7 @@ next_one:
tmp = *timer;
spin_unlock_irqrestore(&base->cpu_base->lock, flags);
- print_timer(m, &tmp, i, now);
+ print_timer(m, timer, &tmp, i, now);
next++;
goto next_one;
}
@@ -109,6 +110,7 @@ next_one:
static void
print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now)
{
+ SEQ_printf(m, " .base: %p\n", base);
SEQ_printf(m, " .index: %d\n",
base->index);
SEQ_printf(m, " .resolution: %Lu nsecs\n",
@@ -183,12 +185,16 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
#ifdef CONFIG_GENERIC_CLOCKEVENTS
static void
-print_tickdevice(struct seq_file *m, struct tick_device *td)
+print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu)
{
struct clock_event_device *dev = td->evtdev;
SEQ_printf(m, "\n");
SEQ_printf(m, "Tick Device: mode: %d\n", td->mode);
+ if (cpu < 0)
+ SEQ_printf(m, "Broadcast device\n");
+ else
+ SEQ_printf(m, "Per CPU device: %d\n", cpu);
SEQ_printf(m, "Clock Event Device: ");
if (!dev) {
@@ -222,7 +228,7 @@ static void timer_list_show_tickdevices(struct seq_file *m)
int cpu;
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
- print_tickdevice(m, tick_get_broadcast_device());
+ print_tickdevice(m, tick_get_broadcast_device(), -1);
SEQ_printf(m, "tick_broadcast_mask: %08lx\n",
tick_get_broadcast_mask()->bits[0]);
#ifdef CONFIG_TICK_ONESHOT
@@ -232,7 +238,7 @@ static void timer_list_show_tickdevices(struct seq_file *m)
SEQ_printf(m, "\n");
#endif
for_each_online_cpu(cpu)
- print_tickdevice(m, tick_get_device(cpu));
+ print_tickdevice(m, tick_get_device(cpu), cpu);
SEQ_printf(m, "\n");
}
#else
@@ -244,7 +250,7 @@ static int timer_list_show(struct seq_file *m, void *v)
u64 now = ktime_to_ns(ktime_get());
int cpu;
- SEQ_printf(m, "Timer List Version: v0.3\n");
+ SEQ_printf(m, "Timer List Version: v0.4\n");
SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
diff --git a/kernel/timer.c b/kernel/timer.c
index 03bc7f1f159..56becf373c5 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -978,6 +978,7 @@ void update_process_times(int user_tick)
run_local_timers();
if (rcu_pending(cpu))
rcu_check_callbacks(cpu, user_tick);
+ printk_tick();
scheduler_tick();
run_posix_cpu_timers(p);
}
@@ -1435,9 +1436,11 @@ static void __cpuinit migrate_timers(int cpu)
BUG_ON(cpu_online(cpu));
old_base = per_cpu(tvec_bases, cpu);
new_base = get_cpu_var(tvec_bases);
-
- local_irq_disable();
- spin_lock(&new_base->lock);
+ /*
+ * The caller is globally serialized and nobody else
+ * takes two locks at once, deadlock is not possible.
+ */
+ spin_lock_irq(&new_base->lock);
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
BUG_ON(old_base->running_timer);
@@ -1452,8 +1455,7 @@ static void __cpuinit migrate_timers(int cpu)
}
spin_unlock(&old_base->lock);
- spin_unlock(&new_base->lock);
- local_irq_enable();
+ spin_unlock_irq(&new_base->lock);
put_cpu_var(tvec_bases);
}
#endif /* CONFIG_HOTPLUG_CPU */
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 263e9e6bbd6..1cb3e1f616a 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -1,23 +1,37 @@
#
# Architectures that offer an FTRACE implementation should select HAVE_FTRACE:
#
+
+config NOP_TRACER
+ bool
+
config HAVE_FTRACE
bool
+ select NOP_TRACER
config HAVE_DYNAMIC_FTRACE
bool
+config HAVE_FTRACE_MCOUNT_RECORD
+ bool
+
config TRACER_MAX_TRACE
bool
+config RING_BUFFER
+ bool
+
config TRACING
bool
select DEBUG_FS
+ select RING_BUFFER
select STACKTRACE
+ select TRACEPOINTS
config FTRACE
bool "Kernel Function Tracer"
depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
select FRAME_POINTER
select TRACING
select CONTEXT_SWITCH_TRACER
@@ -36,6 +50,7 @@ config IRQSOFF_TRACER
depends on TRACE_IRQFLAGS_SUPPORT
depends on GENERIC_TIME
depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
select TRACE_IRQFLAGS
select TRACING
select TRACER_MAX_TRACE
@@ -59,6 +74,7 @@ config PREEMPT_TRACER
depends on GENERIC_TIME
depends on PREEMPT
depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
select TRACING
select TRACER_MAX_TRACE
help
@@ -86,6 +102,7 @@ config SYSPROF_TRACER
config SCHED_TRACER
bool "Scheduling Latency Tracer"
depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
select TRACING
select CONTEXT_SWITCH_TRACER
select TRACER_MAX_TRACE
@@ -96,16 +113,56 @@ config SCHED_TRACER
config CONTEXT_SWITCH_TRACER
bool "Trace process context switches"
depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
select TRACING
select MARKERS
help
This tracer gets called from the context switch and records
all switching of tasks.
+config BOOT_TRACER
+ bool "Trace boot initcalls"
+ depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
+ select TRACING
+ help
+ This tracer helps developers to optimize boot times: it records
+ the timings of the initcalls and traces key events and the identity
+ of tasks that can cause boot delays, such as context-switches.
+
+ Its aim is to be parsed by the /scripts/bootgraph.pl tool to
+ produce pretty graphics about boot inefficiencies, giving a visual
+ representation of the delays during initcalls - but the raw
+ /debug/tracing/trace text output is readable too.
+
+ ( Note that tracing self tests can't be enabled if this tracer is
+ selected, because the self-tests are an initcall as well and that
+ would invalidate the boot trace. )
+
+config STACK_TRACER
+ bool "Trace max stack"
+ depends on HAVE_FTRACE
+ depends on DEBUG_KERNEL
+ select FTRACE
+ select STACKTRACE
+ help
+ This special tracer records the maximum stack footprint of the
+ kernel and displays it in debugfs/tracing/stack_trace.
+
+ This tracer works by hooking into every function call that the
+ kernel executes, and keeping a maximum stack depth value and
+ stack-trace saved. Because this logic has to execute in every
+ kernel function, all the time, this option can slow down the
+ kernel measurably and is generally intended for kernel
+ developers only.
+
+ Say N if unsure.
+
config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"
depends on FTRACE
depends on HAVE_DYNAMIC_FTRACE
+ depends on DEBUG_KERNEL
default y
help
This option will modify all the calls to ftrace dynamically
@@ -121,12 +178,17 @@ config DYNAMIC_FTRACE
were made. If so, it runs stop_machine (stops all CPUS)
and modifies the code to jump over the call to ftrace.
+config FTRACE_MCOUNT_RECORD
+ def_bool y
+ depends on DYNAMIC_FTRACE
+ depends on HAVE_FTRACE_MCOUNT_RECORD
+
config FTRACE_SELFTEST
bool
config FTRACE_STARTUP_TEST
bool "Perform a startup test on ftrace"
- depends on TRACING
+ depends on TRACING && DEBUG_KERNEL && !BOOT_TRACER
select FTRACE_SELFTEST
help
This option performs a series of startup tests on ftrace. On bootup
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 71d17de1728..a85dfba88ba 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -11,6 +11,7 @@ obj-y += trace_selftest_dynamic.o
endif
obj-$(CONFIG_FTRACE) += libftrace.o
+obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
obj-$(CONFIG_TRACING) += trace.o
obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
@@ -19,6 +20,9 @@ obj-$(CONFIG_FTRACE) += trace_functions.o
obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
+obj-$(CONFIG_NOP_TRACER) += trace_nop.o
+obj-$(CONFIG_STACK_TRACER) += trace_stack.o
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
+obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f6e3af31b40..4dda4f60a2a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -81,7 +81,7 @@ void clear_ftrace_function(void)
static int __register_ftrace_function(struct ftrace_ops *ops)
{
- /* Should never be called by interrupts */
+ /* should not be called from interrupt context */
spin_lock(&ftrace_lock);
ops->next = ftrace_list;
@@ -115,6 +115,7 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
struct ftrace_ops **p;
int ret = 0;
+ /* should not be called from interrupt context */
spin_lock(&ftrace_lock);
/*
@@ -153,6 +154,30 @@ static int __unregister_ftrace_function(struct ftrace_ops *ops)
#ifdef CONFIG_DYNAMIC_FTRACE
+#ifndef CONFIG_FTRACE_MCOUNT_RECORD
+/*
+ * The hash lock is only needed when the recording of the mcount
+ * callers are dynamic. That is, by the caller themselves and
+ * not recorded via the compilation.
+ */
+static DEFINE_SPINLOCK(ftrace_hash_lock);
+#define ftrace_hash_lock(flags) spin_lock_irqsave(&ftrace_hash_lock, flags)
+#define ftrace_hash_unlock(flags) \
+ spin_unlock_irqrestore(&ftrace_hash_lock, flags)
+#else
+/* This is protected via the ftrace_lock with MCOUNT_RECORD. */
+#define ftrace_hash_lock(flags) do { (void)(flags); } while (0)
+#define ftrace_hash_unlock(flags) do { } while(0)
+#endif
+
+/*
+ * Since MCOUNT_ADDR may point to mcount itself, we do not want
+ * to get it confused by reading a reference in the code as we
+ * are parsing on objcopy output of text. Use a variable for
+ * it instead.
+ */
+static unsigned long mcount_addr = MCOUNT_ADDR;
+
static struct task_struct *ftraced_task;
enum {
@@ -171,7 +196,6 @@ static struct hlist_head ftrace_hash[FTRACE_HASHSIZE];
static DEFINE_PER_CPU(int, ftrace_shutdown_disable_cpu);
-static DEFINE_SPINLOCK(ftrace_shutdown_lock);
static DEFINE_MUTEX(ftraced_lock);
static DEFINE_MUTEX(ftrace_regex_lock);
@@ -294,13 +318,37 @@ static inline void ftrace_del_hash(struct dyn_ftrace *node)
static void ftrace_free_rec(struct dyn_ftrace *rec)
{
- /* no locking, only called from kstop_machine */
-
rec->ip = (unsigned long)ftrace_free_records;
ftrace_free_records = rec;
rec->flags |= FTRACE_FL_FREE;
}
+void ftrace_release(void *start, unsigned long size)
+{
+ struct dyn_ftrace *rec;
+ struct ftrace_page *pg;
+ unsigned long s = (unsigned long)start;
+ unsigned long e = s + size;
+ int i;
+
+ if (ftrace_disabled || !start)
+ return;
+
+ /* should not be called from interrupt context */
+ spin_lock(&ftrace_lock);
+
+ for (pg = ftrace_pages_start; pg; pg = pg->next) {
+ for (i = 0; i < pg->index; i++) {
+ rec = &pg->records[i];
+
+ if ((rec->ip >= s) && (rec->ip < e))
+ ftrace_free_rec(rec);
+ }
+ }
+ spin_unlock(&ftrace_lock);
+
+}
+
static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
{
struct dyn_ftrace *rec;
@@ -338,7 +386,6 @@ ftrace_record_ip(unsigned long ip)
unsigned long flags;
unsigned long key;
int resched;
- int atomic;
int cpu;
if (!ftrace_enabled || ftrace_disabled)
@@ -368,9 +415,7 @@ ftrace_record_ip(unsigned long ip)
if (ftrace_ip_in_hash(ip, key))
goto out;
- atomic = irqs_disabled();
-
- spin_lock_irqsave(&ftrace_shutdown_lock, flags);
+ ftrace_hash_lock(flags);
/* This ip may have hit the hash before the lock */
if (ftrace_ip_in_hash(ip, key))
@@ -387,7 +432,7 @@ ftrace_record_ip(unsigned long ip)
ftraced_trigger = 1;
out_unlock:
- spin_unlock_irqrestore(&ftrace_shutdown_lock, flags);
+ ftrace_hash_unlock(flags);
out:
per_cpu(ftrace_shutdown_disable_cpu, cpu)--;
@@ -531,6 +576,16 @@ static void ftrace_shutdown_replenish(void)
ftrace_pages->next = (void *)get_zeroed_page(GFP_KERNEL);
}
+static void print_ip_ins(const char *fmt, unsigned char *p)
+{
+ int i;
+
+ printk(KERN_CONT "%s", fmt);
+
+ for (i = 0; i < MCOUNT_INSN_SIZE; i++)
+ printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]);
+}
+
static int
ftrace_code_disable(struct dyn_ftrace *rec)
{
@@ -541,10 +596,27 @@ ftrace_code_disable(struct dyn_ftrace *rec)
ip = rec->ip;
nop = ftrace_nop_replace();
- call = ftrace_call_replace(ip, MCOUNT_ADDR);
+ call = ftrace_call_replace(ip, mcount_addr);
failed = ftrace_modify_code(ip, call, nop);
if (failed) {
+ switch (failed) {
+ case 1:
+ WARN_ON_ONCE(1);
+ pr_info("ftrace faulted on modifying ");
+ print_ip_sym(ip);
+ break;
+ case 2:
+ WARN_ON_ONCE(1);
+ pr_info("ftrace failed to modify ");
+ print_ip_sym(ip);
+ print_ip_ins(" expected: ", call);
+ print_ip_ins(" actual: ", (unsigned char *)ip);
+ print_ip_ins(" replace: ", nop);
+ printk(KERN_CONT "\n");
+ break;
+ }
+
rec->flags |= FTRACE_FL_FAILED;
return 0;
}
@@ -792,47 +864,7 @@ static int ftrace_update_code(void)
return 1;
}
-static int ftraced(void *ignore)
-{
- unsigned long usecs;
-
- while (!kthread_should_stop()) {
-
- set_current_state(TASK_INTERRUPTIBLE);
-
- /* check once a second */
- schedule_timeout(HZ);
-
- if (unlikely(ftrace_disabled))
- continue;
-
- mutex_lock(&ftrace_sysctl_lock);
- mutex_lock(&ftraced_lock);
- if (!ftraced_suspend && !ftraced_stop &&
- ftrace_update_code()) {
- usecs = nsecs_to_usecs(ftrace_update_time);
- if (ftrace_update_tot_cnt > 100000) {
- ftrace_update_tot_cnt = 0;
- pr_info("hm, dftrace overflow: %lu change%s"
- " (%lu total) in %lu usec%s\n",
- ftrace_update_cnt,
- ftrace_update_cnt != 1 ? "s" : "",
- ftrace_update_tot_cnt,
- usecs, usecs != 1 ? "s" : "");
- ftrace_disabled = 1;
- WARN_ON_ONCE(1);
- }
- }
- mutex_unlock(&ftraced_lock);
- mutex_unlock(&ftrace_sysctl_lock);
-
- ftrace_shutdown_replenish();
- }
- __set_current_state(TASK_RUNNING);
- return 0;
-}
-
-static int __init ftrace_dyn_table_alloc(void)
+static int __init ftrace_dyn_table_alloc(unsigned long num_to_init)
{
struct ftrace_page *pg;
int cnt;
@@ -859,7 +891,9 @@ static int __init ftrace_dyn_table_alloc(void)
pg = ftrace_pages = ftrace_pages_start;
- cnt = NR_TO_INIT / ENTRIES_PER_PAGE;
+ cnt = num_to_init / ENTRIES_PER_PAGE;
+ pr_info("ftrace: allocating %ld hash entries in %d pages\n",
+ num_to_init, cnt);
for (i = 0; i < cnt; i++) {
pg->next = (void *)get_zeroed_page(GFP_KERNEL);
@@ -901,6 +935,8 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
(*pos)++;
+ /* should not be called from interrupt context */
+ spin_lock(&ftrace_lock);
retry:
if (iter->idx >= iter->pg->index) {
if (iter->pg->next) {
@@ -910,15 +946,13 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
}
} else {
rec = &iter->pg->records[iter->idx++];
- if ((!(iter->flags & FTRACE_ITER_FAILURES) &&
+ if ((rec->flags & FTRACE_FL_FREE) ||
+
+ (!(iter->flags & FTRACE_ITER_FAILURES) &&
(rec->flags & FTRACE_FL_FAILED)) ||
((iter->flags & FTRACE_ITER_FAILURES) &&
- (!(rec->flags & FTRACE_FL_FAILED) ||
- (rec->flags & FTRACE_FL_FREE))) ||
-
- ((iter->flags & FTRACE_ITER_FILTER) &&
- !(rec->flags & FTRACE_FL_FILTER)) ||
+ !(rec->flags & FTRACE_FL_FAILED)) ||
((iter->flags & FTRACE_ITER_NOTRACE) &&
!(rec->flags & FTRACE_FL_NOTRACE))) {
@@ -926,6 +960,7 @@ t_next(struct seq_file *m, void *v, loff_t *pos)
goto retry;
}
}
+ spin_unlock(&ftrace_lock);
iter->pos = *pos;
@@ -1039,8 +1074,8 @@ static void ftrace_filter_reset(int enable)
unsigned long type = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
unsigned i;
- /* keep kstop machine from running */
- preempt_disable();
+ /* should not be called from interrupt context */
+ spin_lock(&ftrace_lock);
if (enable)
ftrace_filtered = 0;
pg = ftrace_pages_start;
@@ -1053,7 +1088,7 @@ static void ftrace_filter_reset(int enable)
}
pg = pg->next;
}
- preempt_enable();
+ spin_unlock(&ftrace_lock);
}
static int
@@ -1165,8 +1200,8 @@ ftrace_match(unsigned char *buff, int len, int enable)
}
}
- /* keep kstop machine from running */
- preempt_disable();
+ /* should not be called from interrupt context */
+ spin_lock(&ftrace_lock);
if (enable)
ftrace_filtered = 1;
pg = ftrace_pages_start;
@@ -1203,7 +1238,7 @@ ftrace_match(unsigned char *buff, int len, int enable)
}
pg = pg->next;
}
- preempt_enable();
+ spin_unlock(&ftrace_lock);
}
static ssize_t
@@ -1556,6 +1591,114 @@ static __init int ftrace_init_debugfs(void)
fs_initcall(ftrace_init_debugfs);
+#ifdef CONFIG_FTRACE_MCOUNT_RECORD
+static int ftrace_convert_nops(unsigned long *start,
+ unsigned long *end)
+{
+ unsigned long *p;
+ unsigned long addr;
+ unsigned long flags;
+
+ p = start;
+ while (p < end) {
+ addr = ftrace_call_adjust(*p++);
+ /* should not be called from interrupt context */
+ spin_lock(&ftrace_lock);
+ ftrace_record_ip(addr);
+ spin_unlock(&ftrace_lock);
+ ftrace_shutdown_replenish();
+ }
+
+ /* p is ignored */
+ local_irq_save(flags);
+ __ftrace_update_code(p);
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+void ftrace_init_module(unsigned long *start, unsigned long *end)
+{
+ if (ftrace_disabled || start == end)
+ return;
+ ftrace_convert_nops(start, end);
+}
+
+extern unsigned long __start_mcount_loc[];
+extern unsigned long __stop_mcount_loc[];
+
+void __init ftrace_init(void)
+{
+ unsigned long count, addr, flags;
+ int ret;
+
+ /* Keep the ftrace pointer to the stub */
+ addr = (unsigned long)ftrace_stub;
+
+ local_irq_save(flags);
+ ftrace_dyn_arch_init(&addr);
+ local_irq_restore(flags);
+
+ /* ftrace_dyn_arch_init places the return code in addr */
+ if (addr)
+ goto failed;
+
+ count = __stop_mcount_loc - __start_mcount_loc;
+
+ ret = ftrace_dyn_table_alloc(count);
+ if (ret)
+ goto failed;
+
+ last_ftrace_enabled = ftrace_enabled = 1;
+
+ ret = ftrace_convert_nops(__start_mcount_loc,
+ __stop_mcount_loc);
+
+ return;
+ failed:
+ ftrace_disabled = 1;
+}
+#else /* CONFIG_FTRACE_MCOUNT_RECORD */
+static int ftraced(void *ignore)
+{
+ unsigned long usecs;
+
+ while (!kthread_should_stop()) {
+
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ /* check once a second */
+ schedule_timeout(HZ);
+
+ if (unlikely(ftrace_disabled))
+ continue;
+
+ mutex_lock(&ftrace_sysctl_lock);
+ mutex_lock(&ftraced_lock);
+ if (!ftraced_suspend && !ftraced_stop &&
+ ftrace_update_code()) {
+ usecs = nsecs_to_usecs(ftrace_update_time);
+ if (ftrace_update_tot_cnt > 100000) {
+ ftrace_update_tot_cnt = 0;
+ pr_info("hm, dftrace overflow: %lu change%s"
+ " (%lu total) in %lu usec%s\n",
+ ftrace_update_cnt,
+ ftrace_update_cnt != 1 ? "s" : "",
+ ftrace_update_tot_cnt,
+ usecs, usecs != 1 ? "s" : "");
+ ftrace_disabled = 1;
+ WARN_ON_ONCE(1);
+ }
+ }
+ mutex_unlock(&ftraced_lock);
+ mutex_unlock(&ftrace_sysctl_lock);
+
+ ftrace_shutdown_replenish();
+ }
+ __set_current_state(TASK_RUNNING);
+ return 0;
+}
+
static int __init ftrace_dynamic_init(void)
{
struct task_struct *p;
@@ -1572,7 +1715,7 @@ static int __init ftrace_dynamic_init(void)
goto failed;
}
- ret = ftrace_dyn_table_alloc();
+ ret = ftrace_dyn_table_alloc(NR_TO_INIT);
if (ret)
goto failed;
@@ -1593,6 +1736,8 @@ static int __init ftrace_dynamic_init(void)
}
core_initcall(ftrace_dynamic_init);
+#endif /* CONFIG_FTRACE_MCOUNT_RECORD */
+
#else
# define ftrace_startup() do { } while (0)
# define ftrace_shutdown() do { } while (0)
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
new file mode 100644
index 00000000000..94af1fe56bb
--- /dev/null
+++ b/kernel/trace/ring_buffer.c
@@ -0,0 +1,2014 @@
+/*
+ * Generic ring buffer
+ *
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ */
+#include <linux/ring_buffer.h>
+#include <linux/spinlock.h>
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/percpu.h>
+#include <linux/mutex.h>
+#include <linux/sched.h> /* used for sched_clock() (for now) */
+#include <linux/init.h>
+#include <linux/hash.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+
+/* Up this if you want to test the TIME_EXTENTS and normalization */
+#define DEBUG_SHIFT 0
+
+/* FIXME!!! */
+u64 ring_buffer_time_stamp(int cpu)
+{
+ /* shift to debug/test normalization and TIME_EXTENTS */
+ return sched_clock() << DEBUG_SHIFT;
+}
+
+void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
+{
+ /* Just stupid testing the normalize function and deltas */
+ *ts >>= DEBUG_SHIFT;
+}
+
+#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
+#define RB_ALIGNMENT_SHIFT 2
+#define RB_ALIGNMENT (1 << RB_ALIGNMENT_SHIFT)
+#define RB_MAX_SMALL_DATA 28
+
+enum {
+ RB_LEN_TIME_EXTEND = 8,
+ RB_LEN_TIME_STAMP = 16,
+};
+
+/* inline for ring buffer fast paths */
+static inline unsigned
+rb_event_length(struct ring_buffer_event *event)
+{
+ unsigned length;
+
+ switch (event->type) {
+ case RINGBUF_TYPE_PADDING:
+ /* undefined */
+ return -1;
+
+ case RINGBUF_TYPE_TIME_EXTEND:
+ return RB_LEN_TIME_EXTEND;
+
+ case RINGBUF_TYPE_TIME_STAMP:
+ return RB_LEN_TIME_STAMP;
+
+ case RINGBUF_TYPE_DATA:
+ if (event->len)
+ length = event->len << RB_ALIGNMENT_SHIFT;
+ else
+ length = event->array[0];
+ return length + RB_EVNT_HDR_SIZE;
+ default:
+ BUG();
+ }
+ /* not hit */
+ return 0;
+}
+
+/**
+ * ring_buffer_event_length - return the length of the event
+ * @event: the event to get the length of
+ */
+unsigned ring_buffer_event_length(struct ring_buffer_event *event)
+{
+ return rb_event_length(event);
+}
+
+/* inline for ring buffer fast paths */
+static inline void *
+rb_event_data(struct ring_buffer_event *event)
+{
+ BUG_ON(event->type != RINGBUF_TYPE_DATA);
+ /* If length is in len field, then array[0] has the data */
+ if (event->len)
+ return (void *)&event->array[0];
+ /* Otherwise length is in array[0] and array[1] has the data */
+ return (void *)&event->array[1];
+}
+
+/**
+ * ring_buffer_event_data - return the data of the event
+ * @event: the event to get the data from
+ */
+void *ring_buffer_event_data(struct ring_buffer_event *event)
+{
+ return rb_event_data(event);
+}
+
+#define for_each_buffer_cpu(buffer, cpu) \
+ for_each_cpu_mask(cpu, buffer->cpumask)
+
+#define TS_SHIFT 27
+#define TS_MASK ((1ULL << TS_SHIFT) - 1)
+#define TS_DELTA_TEST (~TS_MASK)
+
+/*
+ * This hack stolen from mm/slob.c.
+ * We can store per page timing information in the page frame of the page.
+ * Thanks to Peter Zijlstra for suggesting this idea.
+ */
+struct buffer_page {
+ u64 time_stamp; /* page time stamp */
+ local_t write; /* index for next write */
+ local_t commit; /* write commited index */
+ unsigned read; /* index for next read */
+ struct list_head list; /* list of free pages */
+ void *page; /* Actual data page */
+};
+
+/*
+ * Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
+ * this issue out.
+ */
+static inline void free_buffer_page(struct buffer_page *bpage)
+{
+ if (bpage->page)
+ __free_page(bpage->page);
+ kfree(bpage);
+}
+
+/*
+ * We need to fit the time_stamp delta into 27 bits.
+ */
+static inline int test_time_stamp(u64 delta)
+{
+ if (delta & TS_DELTA_TEST)
+ return 1;
+ return 0;
+}
+
+#define BUF_PAGE_SIZE PAGE_SIZE
+
+/*
+ * head_page == tail_page && head == tail then buffer is empty.
+ */
+struct ring_buffer_per_cpu {
+ int cpu;
+ struct ring_buffer *buffer;
+ spinlock_t lock;
+ struct lock_class_key lock_key;
+ struct list_head pages;
+ struct buffer_page *head_page; /* read from head */
+ struct buffer_page *tail_page; /* write to tail */
+ struct buffer_page *commit_page; /* commited pages */
+ struct buffer_page *reader_page;
+ unsigned long overrun;
+ unsigned long entries;
+ u64 write_stamp;
+ u64 read_stamp;
+ atomic_t record_disabled;
+};
+
+struct ring_buffer {
+ unsigned long size;
+ unsigned pages;
+ unsigned flags;
+ int cpus;
+ cpumask_t cpumask;
+ atomic_t record_disabled;
+
+ struct mutex mutex;
+
+ struct ring_buffer_per_cpu **buffers;
+};
+
+struct ring_buffer_iter {
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned long head;
+ struct buffer_page *head_page;
+ u64 read_stamp;
+};
+
+#define RB_WARN_ON(buffer, cond) \
+ do { \
+ if (unlikely(cond)) { \
+ atomic_inc(&buffer->record_disabled); \
+ WARN_ON(1); \
+ } \
+ } while (0)
+
+#define RB_WARN_ON_RET(buffer, cond) \
+ do { \
+ if (unlikely(cond)) { \
+ atomic_inc(&buffer->record_disabled); \
+ WARN_ON(1); \
+ return -1; \
+ } \
+ } while (0)
+
+#define RB_WARN_ON_ONCE(buffer, cond) \
+ do { \
+ static int once; \
+ if (unlikely(cond) && !once) { \
+ once++; \
+ atomic_inc(&buffer->record_disabled); \
+ WARN_ON(1); \
+ } \
+ } while (0)
+
+/**
+ * check_pages - integrity check of buffer pages
+ * @cpu_buffer: CPU buffer with pages to test
+ *
+ * As a safty measure we check to make sure the data pages have not
+ * been corrupted.
+ */
+static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ struct list_head *head = &cpu_buffer->pages;
+ struct buffer_page *page, *tmp;
+
+ RB_WARN_ON_RET(cpu_buffer, head->next->prev != head);
+ RB_WARN_ON_RET(cpu_buffer, head->prev->next != head);
+
+ list_for_each_entry_safe(page, tmp, head, list) {
+ RB_WARN_ON_RET(cpu_buffer,
+ page->list.next->prev != &page->list);
+ RB_WARN_ON_RET(cpu_buffer,
+ page->list.prev->next != &page->list);
+ }
+
+ return 0;
+}
+
+static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
+ unsigned nr_pages)
+{
+ struct list_head *head = &cpu_buffer->pages;
+ struct buffer_page *page, *tmp;
+ unsigned long addr;
+ LIST_HEAD(pages);
+ unsigned i;
+
+ for (i = 0; i < nr_pages; i++) {
+ page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()),
+ GFP_KERNEL, cpu_to_node(cpu_buffer->cpu));
+ if (!page)
+ goto free_pages;
+ list_add(&page->list, &pages);
+
+ addr = __get_free_page(GFP_KERNEL);
+ if (!addr)
+ goto free_pages;
+ page->page = (void *)addr;
+ }
+
+ list_splice(&pages, head);
+
+ rb_check_pages(cpu_buffer);
+
+ return 0;
+
+ free_pages:
+ list_for_each_entry_safe(page, tmp, &pages, list) {
+ list_del_init(&page->list);
+ free_buffer_page(page);
+ }
+ return -ENOMEM;
+}
+
+static struct ring_buffer_per_cpu *
+rb_allocate_cpu_buffer(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct buffer_page *page;
+ unsigned long addr;
+ int ret;
+
+ cpu_buffer = kzalloc_node(ALIGN(sizeof(*cpu_buffer), cache_line_size()),
+ GFP_KERNEL, cpu_to_node(cpu));
+ if (!cpu_buffer)
+ return NULL;
+
+ cpu_buffer->cpu = cpu;
+ cpu_buffer->buffer = buffer;
+ spin_lock_init(&cpu_buffer->lock);
+ INIT_LIST_HEAD(&cpu_buffer->pages);
+
+ page = kzalloc_node(ALIGN(sizeof(*page), cache_line_size()),
+ GFP_KERNEL, cpu_to_node(cpu));
+ if (!page)
+ goto fail_free_buffer;
+
+ cpu_buffer->reader_page = page;
+ addr = __get_free_page(GFP_KERNEL);
+ if (!addr)
+ goto fail_free_reader;
+ page->page = (void *)addr;
+
+ INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
+
+ ret = rb_allocate_pages(cpu_buffer, buffer->pages);
+ if (ret < 0)
+ goto fail_free_reader;
+
+ cpu_buffer->head_page
+ = list_entry(cpu_buffer->pages.next, struct buffer_page, list);
+ cpu_buffer->tail_page = cpu_buffer->commit_page = cpu_buffer->head_page;
+
+ return cpu_buffer;
+
+ fail_free_reader:
+ free_buffer_page(cpu_buffer->reader_page);
+
+ fail_free_buffer:
+ kfree(cpu_buffer);
+ return NULL;
+}
+
+static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ struct list_head *head = &cpu_buffer->pages;
+ struct buffer_page *page, *tmp;
+
+ list_del_init(&cpu_buffer->reader_page->list);
+ free_buffer_page(cpu_buffer->reader_page);
+
+ list_for_each_entry_safe(page, tmp, head, list) {
+ list_del_init(&page->list);
+ free_buffer_page(page);
+ }
+ kfree(cpu_buffer);
+}
+
+/*
+ * Causes compile errors if the struct buffer_page gets bigger
+ * than the struct page.
+ */
+extern int ring_buffer_page_too_big(void);
+
+/**
+ * ring_buffer_alloc - allocate a new ring_buffer
+ * @size: the size in bytes that is needed.
+ * @flags: attributes to set for the ring buffer.
+ *
+ * Currently the only flag that is available is the RB_FL_OVERWRITE
+ * flag. This flag means that the buffer will overwrite old data
+ * when the buffer wraps. If this flag is not set, the buffer will
+ * drop data when the tail hits the head.
+ */
+struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
+{
+ struct ring_buffer *buffer;
+ int bsize;
+ int cpu;
+
+ /* Paranoid! Optimizes out when all is well */
+ if (sizeof(struct buffer_page) > sizeof(struct page))
+ ring_buffer_page_too_big();
+
+
+ /* keep it in its own cache line */
+ buffer = kzalloc(ALIGN(sizeof(*buffer), cache_line_size()),
+ GFP_KERNEL);
+ if (!buffer)
+ return NULL;
+
+ buffer->pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
+ buffer->flags = flags;
+
+ /* need at least two pages */
+ if (buffer->pages == 1)
+ buffer->pages++;
+
+ buffer->cpumask = cpu_possible_map;
+ buffer->cpus = nr_cpu_ids;
+
+ bsize = sizeof(void *) * nr_cpu_ids;
+ buffer->buffers = kzalloc(ALIGN(bsize, cache_line_size()),
+ GFP_KERNEL);
+ if (!buffer->buffers)
+ goto fail_free_buffer;
+
+ for_each_buffer_cpu(buffer, cpu) {
+ buffer->buffers[cpu] =
+ rb_allocate_cpu_buffer(buffer, cpu);
+ if (!buffer->buffers[cpu])
+ goto fail_free_buffers;
+ }
+
+ mutex_init(&buffer->mutex);
+
+ return buffer;
+
+ fail_free_buffers:
+ for_each_buffer_cpu(buffer, cpu) {
+ if (buffer->buffers[cpu])
+ rb_free_cpu_buffer(buffer->buffers[cpu]);
+ }
+ kfree(buffer->buffers);
+
+ fail_free_buffer:
+ kfree(buffer);
+ return NULL;
+}
+
+/**
+ * ring_buffer_free - free a ring buffer.
+ * @buffer: the buffer to free.
+ */
+void
+ring_buffer_free(struct ring_buffer *buffer)
+{
+ int cpu;
+
+ for_each_buffer_cpu(buffer, cpu)
+ rb_free_cpu_buffer(buffer->buffers[cpu]);
+
+ kfree(buffer);
+}
+
+static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
+
+static void
+rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
+{
+ struct buffer_page *page;
+ struct list_head *p;
+ unsigned i;
+
+ atomic_inc(&cpu_buffer->record_disabled);
+ synchronize_sched();
+
+ for (i = 0; i < nr_pages; i++) {
+ BUG_ON(list_empty(&cpu_buffer->pages));
+ p = cpu_buffer->pages.next;
+ page = list_entry(p, struct buffer_page, list);
+ list_del_init(&page->list);
+ free_buffer_page(page);
+ }
+ BUG_ON(list_empty(&cpu_buffer->pages));
+
+ rb_reset_cpu(cpu_buffer);
+
+ rb_check_pages(cpu_buffer);
+
+ atomic_dec(&cpu_buffer->record_disabled);
+
+}
+
+static void
+rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer,
+ struct list_head *pages, unsigned nr_pages)
+{
+ struct buffer_page *page;
+ struct list_head *p;
+ unsigned i;
+
+ atomic_inc(&cpu_buffer->record_disabled);
+ synchronize_sched();
+
+ for (i = 0; i < nr_pages; i++) {
+ BUG_ON(list_empty(pages));
+ p = pages->next;
+ page = list_entry(p, struct buffer_page, list);
+ list_del_init(&page->list);
+ list_add_tail(&page->list, &cpu_buffer->pages);
+ }
+ rb_reset_cpu(cpu_buffer);
+
+ rb_check_pages(cpu_buffer);
+
+ atomic_dec(&cpu_buffer->record_disabled);
+}
+
+/**
+ * ring_buffer_resize - resize the ring buffer
+ * @buffer: the buffer to resize.
+ * @size: the new size.
+ *
+ * The tracer is responsible for making sure that the buffer is
+ * not being used while changing the size.
+ * Note: We may be able to change the above requirement by using
+ * RCU synchronizations.
+ *
+ * Minimum size is 2 * BUF_PAGE_SIZE.
+ *
+ * Returns -1 on failure.
+ */
+int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned nr_pages, rm_pages, new_pages;
+ struct buffer_page *page, *tmp;
+ unsigned long buffer_size;
+ unsigned long addr;
+ LIST_HEAD(pages);
+ int i, cpu;
+
+ size = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
+ size *= BUF_PAGE_SIZE;
+ buffer_size = buffer->pages * BUF_PAGE_SIZE;
+
+ /* we need a minimum of two pages */
+ if (size < BUF_PAGE_SIZE * 2)
+ size = BUF_PAGE_SIZE * 2;
+
+ if (size == buffer_size)
+ return size;
+
+ mutex_lock(&buffer->mutex);
+
+ nr_pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
+
+ if (size < buffer_size) {
+
+ /* easy case, just free pages */
+ BUG_ON(nr_pages >= buffer->pages);
+
+ rm_pages = buffer->pages - nr_pages;
+
+ for_each_buffer_cpu(buffer, cpu) {
+ cpu_buffer = buffer->buffers[cpu];
+ rb_remove_pages(cpu_buffer, rm_pages);
+ }
+ goto out;
+ }
+
+ /*
+ * This is a bit more difficult. We only want to add pages
+ * when we can allocate enough for all CPUs. We do this
+ * by allocating all the pages and storing them on a local
+ * link list. If we succeed in our allocation, then we
+ * add these pages to the cpu_buffers. Otherwise we just free
+ * them all and return -ENOMEM;
+ */
+ BUG_ON(nr_pages <= buffer->pages);
+ new_pages = nr_pages - buffer->pages;
+
+ for_each_buffer_cpu(buffer, cpu) {
+ for (i = 0; i < new_pages; i++) {
+ page = kzalloc_node(ALIGN(sizeof(*page),
+ cache_line_size()),
+ GFP_KERNEL, cpu_to_node(cpu));
+ if (!page)
+ goto free_pages;
+ list_add(&page->list, &pages);
+ addr = __get_free_page(GFP_KERNEL);
+ if (!addr)
+ goto free_pages;
+ page->page = (void *)addr;
+ }
+ }
+
+ for_each_buffer_cpu(buffer, cpu) {
+ cpu_buffer = buffer->buffers[cpu];
+ rb_insert_pages(cpu_buffer, &pages, new_pages);
+ }
+
+ BUG_ON(!list_empty(&pages));
+
+ out:
+ buffer->pages = nr_pages;
+ mutex_unlock(&buffer->mutex);
+
+ return size;
+
+ free_pages:
+ list_for_each_entry_safe(page, tmp, &pages, list) {
+ list_del_init(&page->list);
+ free_buffer_page(page);
+ }
+ return -ENOMEM;
+}
+
+static inline int rb_null_event(struct ring_buffer_event *event)
+{
+ return event->type == RINGBUF_TYPE_PADDING;
+}
+
+static inline void *__rb_page_index(struct buffer_page *page, unsigned index)
+{
+ return page->page + index;
+}
+
+static inline struct ring_buffer_event *
+rb_reader_event(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ return __rb_page_index(cpu_buffer->reader_page,
+ cpu_buffer->reader_page->read);
+}
+
+static inline struct ring_buffer_event *
+rb_head_event(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ return __rb_page_index(cpu_buffer->head_page,
+ cpu_buffer->head_page->read);
+}
+
+static inline struct ring_buffer_event *
+rb_iter_head_event(struct ring_buffer_iter *iter)
+{
+ return __rb_page_index(iter->head_page, iter->head);
+}
+
+static inline unsigned rb_page_write(struct buffer_page *bpage)
+{
+ return local_read(&bpage->write);
+}
+
+static inline unsigned rb_page_commit(struct buffer_page *bpage)
+{
+ return local_read(&bpage->commit);
+}
+
+/* Size is determined by what has been commited */
+static inline unsigned rb_page_size(struct buffer_page *bpage)
+{
+ return rb_page_commit(bpage);
+}
+
+static inline unsigned
+rb_commit_index(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ return rb_page_commit(cpu_buffer->commit_page);
+}
+
+static inline unsigned rb_head_size(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ return rb_page_commit(cpu_buffer->head_page);
+}
+
+/*
+ * When the tail hits the head and the buffer is in overwrite mode,
+ * the head jumps to the next page and all content on the previous
+ * page is discarded. But before doing so, we update the overrun
+ * variable of the buffer.
+ */
+static void rb_update_overflow(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ struct ring_buffer_event *event;
+ unsigned long head;
+
+ for (head = 0; head < rb_head_size(cpu_buffer);
+ head += rb_event_length(event)) {
+
+ event = __rb_page_index(cpu_buffer->head_page, head);
+ BUG_ON(rb_null_event(event));
+ /* Only count data entries */
+ if (event->type != RINGBUF_TYPE_DATA)
+ continue;
+ cpu_buffer->overrun++;
+ cpu_buffer->entries--;
+ }
+}
+
+static inline void rb_inc_page(struct ring_buffer_per_cpu *cpu_buffer,
+ struct buffer_page **page)
+{
+ struct list_head *p = (*page)->list.next;
+
+ if (p == &cpu_buffer->pages)
+ p = p->next;
+
+ *page = list_entry(p, struct buffer_page, list);
+}
+
+static inline unsigned
+rb_event_index(struct ring_buffer_event *event)
+{
+ unsigned long addr = (unsigned long)event;
+
+ return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE);
+}
+
+static inline int
+rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
+ struct ring_buffer_event *event)
+{
+ unsigned long addr = (unsigned long)event;
+ unsigned long index;
+
+ index = rb_event_index(event);
+ addr &= PAGE_MASK;
+
+ return cpu_buffer->commit_page->page == (void *)addr &&
+ rb_commit_index(cpu_buffer) == index;
+}
+
+static inline void
+rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
+ struct ring_buffer_event *event)
+{
+ unsigned long addr = (unsigned long)event;
+ unsigned long index;
+
+ index = rb_event_index(event);
+ addr &= PAGE_MASK;
+
+ while (cpu_buffer->commit_page->page != (void *)addr) {
+ RB_WARN_ON(cpu_buffer,
+ cpu_buffer->commit_page == cpu_buffer->tail_page);
+ cpu_buffer->commit_page->commit =
+ cpu_buffer->commit_page->write;
+ rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
+ cpu_buffer->write_stamp = cpu_buffer->commit_page->time_stamp;
+ }
+
+ /* Now set the commit to the event's index */
+ local_set(&cpu_buffer->commit_page->commit, index);
+}
+
+static inline void
+rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ /*
+ * We only race with interrupts and NMIs on this CPU.
+ * If we own the commit event, then we can commit
+ * all others that interrupted us, since the interruptions
+ * are in stack format (they finish before they come
+ * back to us). This allows us to do a simple loop to
+ * assign the commit to the tail.
+ */
+ while (cpu_buffer->commit_page != cpu_buffer->tail_page) {
+ cpu_buffer->commit_page->commit =
+ cpu_buffer->commit_page->write;
+ rb_inc_page(cpu_buffer, &cpu_buffer->commit_page);
+ cpu_buffer->write_stamp = cpu_buffer->commit_page->time_stamp;
+ /* add barrier to keep gcc from optimizing too much */
+ barrier();
+ }
+ while (rb_commit_index(cpu_buffer) !=
+ rb_page_write(cpu_buffer->commit_page)) {
+ cpu_buffer->commit_page->commit =
+ cpu_buffer->commit_page->write;
+ barrier();
+ }
+}
+
+static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ cpu_buffer->read_stamp = cpu_buffer->reader_page->time_stamp;
+ cpu_buffer->reader_page->read = 0;
+}
+
+static inline void rb_inc_iter(struct ring_buffer_iter *iter)
+{
+ struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+
+ /*
+ * The iterator could be on the reader page (it starts there).
+ * But the head could have moved, since the reader was
+ * found. Check for this case and assign the iterator
+ * to the head page instead of next.
+ */
+ if (iter->head_page == cpu_buffer->reader_page)
+ iter->head_page = cpu_buffer->head_page;
+ else
+ rb_inc_page(cpu_buffer, &iter->head_page);
+
+ iter->read_stamp = iter->head_page->time_stamp;
+ iter->head = 0;
+}
+
+/**
+ * ring_buffer_update_event - update event type and data
+ * @event: the even to update
+ * @type: the type of event
+ * @length: the size of the event field in the ring buffer
+ *
+ * Update the type and data fields of the event. The length
+ * is the actual size that is written to the ring buffer,
+ * and with this, we can determine what to place into the
+ * data field.
+ */
+static inline void
+rb_update_event(struct ring_buffer_event *event,
+ unsigned type, unsigned length)
+{
+ event->type = type;
+
+ switch (type) {
+
+ case RINGBUF_TYPE_PADDING:
+ break;
+
+ case RINGBUF_TYPE_TIME_EXTEND:
+ event->len =
+ (RB_LEN_TIME_EXTEND + (RB_ALIGNMENT-1))
+ >> RB_ALIGNMENT_SHIFT;
+ break;
+
+ case RINGBUF_TYPE_TIME_STAMP:
+ event->len =
+ (RB_LEN_TIME_STAMP + (RB_ALIGNMENT-1))
+ >> RB_ALIGNMENT_SHIFT;
+ break;
+
+ case RINGBUF_TYPE_DATA:
+ length -= RB_EVNT_HDR_SIZE;
+ if (length > RB_MAX_SMALL_DATA) {
+ event->len = 0;
+ event->array[0] = length;
+ } else
+ event->len =
+ (length + (RB_ALIGNMENT-1))
+ >> RB_ALIGNMENT_SHIFT;
+ break;
+ default:
+ BUG();
+ }
+}
+
+static inline unsigned rb_calculate_event_length(unsigned length)
+{
+ struct ring_buffer_event event; /* Used only for sizeof array */
+
+ /* zero length can cause confusions */
+ if (!length)
+ length = 1;
+
+ if (length > RB_MAX_SMALL_DATA)
+ length += sizeof(event.array[0]);
+
+ length += RB_EVNT_HDR_SIZE;
+ length = ALIGN(length, RB_ALIGNMENT);
+
+ return length;
+}
+
+static struct ring_buffer_event *
+__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
+ unsigned type, unsigned long length, u64 *ts)
+{
+ struct buffer_page *tail_page, *head_page, *reader_page;
+ unsigned long tail, write;
+ struct ring_buffer *buffer = cpu_buffer->buffer;
+ struct ring_buffer_event *event;
+ unsigned long flags;
+
+ tail_page = cpu_buffer->tail_page;
+ write = local_add_return(length, &tail_page->write);
+ tail = write - length;
+
+ /* See if we shot pass the end of this buffer page */
+ if (write > BUF_PAGE_SIZE) {
+ struct buffer_page *next_page = tail_page;
+
+ spin_lock_irqsave(&cpu_buffer->lock, flags);
+
+ rb_inc_page(cpu_buffer, &next_page);
+
+ head_page = cpu_buffer->head_page;
+ reader_page = cpu_buffer->reader_page;
+
+ /* we grabbed the lock before incrementing */
+ RB_WARN_ON(cpu_buffer, next_page == reader_page);
+
+ /*
+ * If for some reason, we had an interrupt storm that made
+ * it all the way around the buffer, bail, and warn
+ * about it.
+ */
+ if (unlikely(next_page == cpu_buffer->commit_page)) {
+ WARN_ON_ONCE(1);
+ goto out_unlock;
+ }
+
+ if (next_page == head_page) {
+ if (!(buffer->flags & RB_FL_OVERWRITE)) {
+ /* reset write */
+ if (tail <= BUF_PAGE_SIZE)
+ local_set(&tail_page->write, tail);
+ goto out_unlock;
+ }
+
+ /* tail_page has not moved yet? */
+ if (tail_page == cpu_buffer->tail_page) {
+ /* count overflows */
+ rb_update_overflow(cpu_buffer);
+
+ rb_inc_page(cpu_buffer, &head_page);
+ cpu_buffer->head_page = head_page;
+ cpu_buffer->head_page->read = 0;
+ }
+ }
+
+ /*
+ * If the tail page is still the same as what we think
+ * it is, then it is up to us to update the tail
+ * pointer.
+ */
+ if (tail_page == cpu_buffer->tail_page) {
+ local_set(&next_page->write, 0);
+ local_set(&next_page->commit, 0);
+ cpu_buffer->tail_page = next_page;
+
+ /* reread the time stamp */
+ *ts = ring_buffer_time_stamp(cpu_buffer->cpu);
+ cpu_buffer->tail_page->time_stamp = *ts;
+ }
+
+ /*
+ * The actual tail page has moved forward.
+ */
+ if (tail < BUF_PAGE_SIZE) {
+ /* Mark the rest of the page with padding */
+ event = __rb_page_index(tail_page, tail);
+ event->type = RINGBUF_TYPE_PADDING;
+ }
+
+ if (tail <= BUF_PAGE_SIZE)
+ /* Set the write back to the previous setting */
+ local_set(&tail_page->write, tail);
+
+ /*
+ * If this was a commit entry that failed,
+ * increment that too
+ */
+ if (tail_page == cpu_buffer->commit_page &&
+ tail == rb_commit_index(cpu_buffer)) {
+ rb_set_commit_to_write(cpu_buffer);
+ }
+
+ spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+
+ /* fail and let the caller try again */
+ return ERR_PTR(-EAGAIN);
+ }
+
+ /* We reserved something on the buffer */
+
+ BUG_ON(write > BUF_PAGE_SIZE);
+
+ event = __rb_page_index(tail_page, tail);
+ rb_update_event(event, type, length);
+
+ /*
+ * If this is a commit and the tail is zero, then update
+ * this page's time stamp.
+ */
+ if (!tail && rb_is_commit(cpu_buffer, event))
+ cpu_buffer->commit_page->time_stamp = *ts;
+
+ return event;
+
+ out_unlock:
+ spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+ return NULL;
+}
+
+static int
+rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
+ u64 *ts, u64 *delta)
+{
+ struct ring_buffer_event *event;
+ static int once;
+ int ret;
+
+ if (unlikely(*delta > (1ULL << 59) && !once++)) {
+ printk(KERN_WARNING "Delta way too big! %llu"
+ " ts=%llu write stamp = %llu\n",
+ *delta, *ts, cpu_buffer->write_stamp);
+ WARN_ON(1);
+ }
+
+ /*
+ * The delta is too big, we to add a
+ * new timestamp.
+ */
+ event = __rb_reserve_next(cpu_buffer,
+ RINGBUF_TYPE_TIME_EXTEND,
+ RB_LEN_TIME_EXTEND,
+ ts);
+ if (!event)
+ return -EBUSY;
+
+ if (PTR_ERR(event) == -EAGAIN)
+ return -EAGAIN;
+
+ /* Only a commited time event can update the write stamp */
+ if (rb_is_commit(cpu_buffer, event)) {
+ /*
+ * If this is the first on the page, then we need to
+ * update the page itself, and just put in a zero.
+ */
+ if (rb_event_index(event)) {
+ event->time_delta = *delta & TS_MASK;
+ event->array[0] = *delta >> TS_SHIFT;
+ } else {
+ cpu_buffer->commit_page->time_stamp = *ts;
+ event->time_delta = 0;
+ event->array[0] = 0;
+ }
+ cpu_buffer->write_stamp = *ts;
+ /* let the caller know this was the commit */
+ ret = 1;
+ } else {
+ /* Darn, this is just wasted space */
+ event->time_delta = 0;
+ event->array[0] = 0;
+ ret = 0;
+ }
+
+ *delta = 0;
+
+ return ret;
+}
+
+static struct ring_buffer_event *
+rb_reserve_next_event(struct ring_buffer_per_cpu *cpu_buffer,
+ unsigned type, unsigned long length)
+{
+ struct ring_buffer_event *event;
+ u64 ts, delta;
+ int commit = 0;
+
+ again:
+ ts = ring_buffer_time_stamp(cpu_buffer->cpu);
+
+ /*
+ * Only the first commit can update the timestamp.
+ * Yes there is a race here. If an interrupt comes in
+ * just after the conditional and it traces too, then it
+ * will also check the deltas. More than one timestamp may
+ * also be made. But only the entry that did the actual
+ * commit will be something other than zero.
+ */
+ if (cpu_buffer->tail_page == cpu_buffer->commit_page &&
+ rb_page_write(cpu_buffer->tail_page) ==
+ rb_commit_index(cpu_buffer)) {
+
+ delta = ts - cpu_buffer->write_stamp;
+
+ /* make sure this delta is calculated here */
+ barrier();
+
+ /* Did the write stamp get updated already? */
+ if (unlikely(ts < cpu_buffer->write_stamp))
+ goto again;
+
+ if (test_time_stamp(delta)) {
+
+ commit = rb_add_time_stamp(cpu_buffer, &ts, &delta);
+
+ if (commit == -EBUSY)
+ return NULL;
+
+ if (commit == -EAGAIN)
+ goto again;
+
+ RB_WARN_ON(cpu_buffer, commit < 0);
+ }
+ } else
+ /* Non commits have zero deltas */
+ delta = 0;
+
+ event = __rb_reserve_next(cpu_buffer, type, length, &ts);
+ if (PTR_ERR(event) == -EAGAIN)
+ goto again;
+
+ if (!event) {
+ if (unlikely(commit))
+ /*
+ * Ouch! We needed a timestamp and it was commited. But
+ * we didn't get our event reserved.
+ */
+ rb_set_commit_to_write(cpu_buffer);
+ return NULL;
+ }
+
+ /*
+ * If the timestamp was commited, make the commit our entry
+ * now so that we will update it when needed.
+ */
+ if (commit)
+ rb_set_commit_event(cpu_buffer, event);
+ else if (!rb_is_commit(cpu_buffer, event))
+ delta = 0;
+
+ event->time_delta = delta;
+
+ return event;
+}
+
+static DEFINE_PER_CPU(int, rb_need_resched);
+
+/**
+ * ring_buffer_lock_reserve - reserve a part of the buffer
+ * @buffer: the ring buffer to reserve from
+ * @length: the length of the data to reserve (excluding event header)
+ * @flags: a pointer to save the interrupt flags
+ *
+ * Returns a reseverd event on the ring buffer to copy directly to.
+ * The user of this interface will need to get the body to write into
+ * and can use the ring_buffer_event_data() interface.
+ *
+ * The length is the length of the data needed, not the event length
+ * which also includes the event header.
+ *
+ * Must be paired with ring_buffer_unlock_commit, unless NULL is returned.
+ * If NULL is returned, then nothing has been allocated or locked.
+ */
+struct ring_buffer_event *
+ring_buffer_lock_reserve(struct ring_buffer *buffer,
+ unsigned long length,
+ unsigned long *flags)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_event *event;
+ int cpu, resched;
+
+ if (atomic_read(&buffer->record_disabled))
+ return NULL;
+
+ /* If we are tracing schedule, we don't want to recurse */
+ resched = need_resched();
+ preempt_disable_notrace();
+
+ cpu = raw_smp_processor_id();
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ goto out;
+
+ cpu_buffer = buffer->buffers[cpu];
+
+ if (atomic_read(&cpu_buffer->record_disabled))
+ goto out;
+
+ length = rb_calculate_event_length(length);
+ if (length > BUF_PAGE_SIZE)
+ goto out;
+
+ event = rb_reserve_next_event(cpu_buffer, RINGBUF_TYPE_DATA, length);
+ if (!event)
+ goto out;
+
+ /*
+ * Need to store resched state on this cpu.
+ * Only the first needs to.
+ */
+
+ if (preempt_count() == 1)
+ per_cpu(rb_need_resched, cpu) = resched;
+
+ return event;
+
+ out:
+ if (resched)
+ preempt_enable_notrace();
+ else
+ preempt_enable_notrace();
+ return NULL;
+}
+
+static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
+ struct ring_buffer_event *event)
+{
+ cpu_buffer->entries++;
+
+ /* Only process further if we own the commit */
+ if (!rb_is_commit(cpu_buffer, event))
+ return;
+
+ cpu_buffer->write_stamp += event->time_delta;
+
+ rb_set_commit_to_write(cpu_buffer);
+}
+
+/**
+ * ring_buffer_unlock_commit - commit a reserved
+ * @buffer: The buffer to commit to
+ * @event: The event pointer to commit.
+ * @flags: the interrupt flags received from ring_buffer_lock_reserve.
+ *
+ * This commits the data to the ring buffer, and releases any locks held.
+ *
+ * Must be paired with ring_buffer_lock_reserve.
+ */
+int ring_buffer_unlock_commit(struct ring_buffer *buffer,
+ struct ring_buffer_event *event,
+ unsigned long flags)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ int cpu = raw_smp_processor_id();
+
+ cpu_buffer = buffer->buffers[cpu];
+
+ rb_commit(cpu_buffer, event);
+
+ /*
+ * Only the last preempt count needs to restore preemption.
+ */
+ if (preempt_count() == 1) {
+ if (per_cpu(rb_need_resched, cpu))
+ preempt_enable_no_resched_notrace();
+ else
+ preempt_enable_notrace();
+ } else
+ preempt_enable_no_resched_notrace();
+
+ return 0;
+}
+
+/**
+ * ring_buffer_write - write data to the buffer without reserving
+ * @buffer: The ring buffer to write to.
+ * @length: The length of the data being written (excluding the event header)
+ * @data: The data to write to the buffer.
+ *
+ * This is like ring_buffer_lock_reserve and ring_buffer_unlock_commit as
+ * one function. If you already have the data to write to the buffer, it
+ * may be easier to simply call this function.
+ *
+ * Note, like ring_buffer_lock_reserve, the length is the length of the data
+ * and not the length of the event which would hold the header.
+ */
+int ring_buffer_write(struct ring_buffer *buffer,
+ unsigned long length,
+ void *data)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_event *event;
+ unsigned long event_length;
+ void *body;
+ int ret = -EBUSY;
+ int cpu, resched;
+
+ if (atomic_read(&buffer->record_disabled))
+ return -EBUSY;
+
+ resched = need_resched();
+ preempt_disable_notrace();
+
+ cpu = raw_smp_processor_id();
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ goto out;
+
+ cpu_buffer = buffer->buffers[cpu];
+
+ if (atomic_read(&cpu_buffer->record_disabled))
+ goto out;
+
+ event_length = rb_calculate_event_length(length);
+ event = rb_reserve_next_event(cpu_buffer,
+ RINGBUF_TYPE_DATA, event_length);
+ if (!event)
+ goto out;
+
+ body = rb_event_data(event);
+
+ memcpy(body, data, length);
+
+ rb_commit(cpu_buffer, event);
+
+ ret = 0;
+ out:
+ if (resched)
+ preempt_enable_no_resched_notrace();
+ else
+ preempt_enable_notrace();
+
+ return ret;
+}
+
+static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ struct buffer_page *reader = cpu_buffer->reader_page;
+ struct buffer_page *head = cpu_buffer->head_page;
+ struct buffer_page *commit = cpu_buffer->commit_page;
+
+ return reader->read == rb_page_commit(reader) &&
+ (commit == reader ||
+ (commit == head &&
+ head->read == rb_page_commit(commit)));
+}
+
+/**
+ * ring_buffer_record_disable - stop all writes into the buffer
+ * @buffer: The ring buffer to stop writes to.
+ *
+ * This prevents all writes to the buffer. Any attempt to write
+ * to the buffer after this will fail and return NULL.
+ *
+ * The caller should call synchronize_sched() after this.
+ */
+void ring_buffer_record_disable(struct ring_buffer *buffer)
+{
+ atomic_inc(&buffer->record_disabled);
+}
+
+/**
+ * ring_buffer_record_enable - enable writes to the buffer
+ * @buffer: The ring buffer to enable writes
+ *
+ * Note, multiple disables will need the same number of enables
+ * to truely enable the writing (much like preempt_disable).
+ */
+void ring_buffer_record_enable(struct ring_buffer *buffer)
+{
+ atomic_dec(&buffer->record_disabled);
+}
+
+/**
+ * ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
+ * @buffer: The ring buffer to stop writes to.
+ * @cpu: The CPU buffer to stop
+ *
+ * This prevents all writes to the buffer. Any attempt to write
+ * to the buffer after this will fail and return NULL.
+ *
+ * The caller should call synchronize_sched() after this.
+ */
+void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return;
+
+ cpu_buffer = buffer->buffers[cpu];
+ atomic_inc(&cpu_buffer->record_disabled);
+}
+
+/**
+ * ring_buffer_record_enable_cpu - enable writes to the buffer
+ * @buffer: The ring buffer to enable writes
+ * @cpu: The CPU to enable.
+ *
+ * Note, multiple disables will need the same number of enables
+ * to truely enable the writing (much like preempt_disable).
+ */
+void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return;
+
+ cpu_buffer = buffer->buffers[cpu];
+ atomic_dec(&cpu_buffer->record_disabled);
+}
+
+/**
+ * ring_buffer_entries_cpu - get the number of entries in a cpu buffer
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the entries from.
+ */
+unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return 0;
+
+ cpu_buffer = buffer->buffers[cpu];
+ return cpu_buffer->entries;
+}
+
+/**
+ * ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
+ * @buffer: The ring buffer
+ * @cpu: The per CPU buffer to get the number of overruns from
+ */
+unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return 0;
+
+ cpu_buffer = buffer->buffers[cpu];
+ return cpu_buffer->overrun;
+}
+
+/**
+ * ring_buffer_entries - get the number of entries in a buffer
+ * @buffer: The ring buffer
+ *
+ * Returns the total number of entries in the ring buffer
+ * (all CPU entries)
+ */
+unsigned long ring_buffer_entries(struct ring_buffer *buffer)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned long entries = 0;
+ int cpu;
+
+ /* if you care about this being correct, lock the buffer */
+ for_each_buffer_cpu(buffer, cpu) {
+ cpu_buffer = buffer->buffers[cpu];
+ entries += cpu_buffer->entries;
+ }
+
+ return entries;
+}
+
+/**
+ * ring_buffer_overrun_cpu - get the number of overruns in buffer
+ * @buffer: The ring buffer
+ *
+ * Returns the total number of overruns in the ring buffer
+ * (all CPU entries)
+ */
+unsigned long ring_buffer_overruns(struct ring_buffer *buffer)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ unsigned long overruns = 0;
+ int cpu;
+
+ /* if you care about this being correct, lock the buffer */
+ for_each_buffer_cpu(buffer, cpu) {
+ cpu_buffer = buffer->buffers[cpu];
+ overruns += cpu_buffer->overrun;
+ }
+
+ return overruns;
+}
+
+/**
+ * ring_buffer_iter_reset - reset an iterator
+ * @iter: The iterator to reset
+ *
+ * Resets the iterator, so that it will start from the beginning
+ * again.
+ */
+void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
+{
+ struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+
+ /* Iterator usage is expected to have record disabled */
+ if (list_empty(&cpu_buffer->reader_page->list)) {
+ iter->head_page = cpu_buffer->head_page;
+ iter->head = cpu_buffer->head_page->read;
+ } else {
+ iter->head_page = cpu_buffer->reader_page;
+ iter->head = cpu_buffer->reader_page->read;
+ }
+ if (iter->head)
+ iter->read_stamp = cpu_buffer->read_stamp;
+ else
+ iter->read_stamp = iter->head_page->time_stamp;
+}
+
+/**
+ * ring_buffer_iter_empty - check if an iterator has no more to read
+ * @iter: The iterator to check
+ */
+int ring_buffer_iter_empty(struct ring_buffer_iter *iter)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+
+ cpu_buffer = iter->cpu_buffer;
+
+ return iter->head_page == cpu_buffer->commit_page &&
+ iter->head == rb_commit_index(cpu_buffer);
+}
+
+static void
+rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
+ struct ring_buffer_event *event)
+{
+ u64 delta;
+
+ switch (event->type) {
+ case RINGBUF_TYPE_PADDING:
+ return;
+
+ case RINGBUF_TYPE_TIME_EXTEND:
+ delta = event->array[0];
+ delta <<= TS_SHIFT;
+ delta += event->time_delta;
+ cpu_buffer->read_stamp += delta;
+ return;
+
+ case RINGBUF_TYPE_TIME_STAMP:
+ /* FIXME: not implemented */
+ return;
+
+ case RINGBUF_TYPE_DATA:
+ cpu_buffer->read_stamp += event->time_delta;
+ return;
+
+ default:
+ BUG();
+ }
+ return;
+}
+
+static void
+rb_update_iter_read_stamp(struct ring_buffer_iter *iter,
+ struct ring_buffer_event *event)
+{
+ u64 delta;
+
+ switch (event->type) {
+ case RINGBUF_TYPE_PADDING:
+ return;
+
+ case RINGBUF_TYPE_TIME_EXTEND:
+ delta = event->array[0];
+ delta <<= TS_SHIFT;
+ delta += event->time_delta;
+ iter->read_stamp += delta;
+ return;
+
+ case RINGBUF_TYPE_TIME_STAMP:
+ /* FIXME: not implemented */
+ return;
+
+ case RINGBUF_TYPE_DATA:
+ iter->read_stamp += event->time_delta;
+ return;
+
+ default:
+ BUG();
+ }
+ return;
+}
+
+static struct buffer_page *
+rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ struct buffer_page *reader = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cpu_buffer->lock, flags);
+
+ again:
+ reader = cpu_buffer->reader_page;
+
+ /* If there's more to read, return this page */
+ if (cpu_buffer->reader_page->read < rb_page_size(reader))
+ goto out;
+
+ /* Never should we have an index greater than the size */
+ RB_WARN_ON(cpu_buffer,
+ cpu_buffer->reader_page->read > rb_page_size(reader));
+
+ /* check if we caught up to the tail */
+ reader = NULL;
+ if (cpu_buffer->commit_page == cpu_buffer->reader_page)
+ goto out;
+
+ /*
+ * Splice the empty reader page into the list around the head.
+ * Reset the reader page to size zero.
+ */
+
+ reader = cpu_buffer->head_page;
+ cpu_buffer->reader_page->list.next = reader->list.next;
+ cpu_buffer->reader_page->list.prev = reader->list.prev;
+
+ local_set(&cpu_buffer->reader_page->write, 0);
+ local_set(&cpu_buffer->reader_page->commit, 0);
+
+ /* Make the reader page now replace the head */
+ reader->list.prev->next = &cpu_buffer->reader_page->list;
+ reader->list.next->prev = &cpu_buffer->reader_page->list;
+
+ /*
+ * If the tail is on the reader, then we must set the head
+ * to the inserted page, otherwise we set it one before.
+ */
+ cpu_buffer->head_page = cpu_buffer->reader_page;
+
+ if (cpu_buffer->commit_page != reader)
+ rb_inc_page(cpu_buffer, &cpu_buffer->head_page);
+
+ /* Finally update the reader page to the new head */
+ cpu_buffer->reader_page = reader;
+ rb_reset_reader_page(cpu_buffer);
+
+ goto again;
+
+ out:
+ spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+
+ return reader;
+}
+
+static void rb_advance_reader(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ struct ring_buffer_event *event;
+ struct buffer_page *reader;
+ unsigned length;
+
+ reader = rb_get_reader_page(cpu_buffer);
+
+ /* This function should not be called when buffer is empty */
+ BUG_ON(!reader);
+
+ event = rb_reader_event(cpu_buffer);
+
+ if (event->type == RINGBUF_TYPE_DATA)
+ cpu_buffer->entries--;
+
+ rb_update_read_stamp(cpu_buffer, event);
+
+ length = rb_event_length(event);
+ cpu_buffer->reader_page->read += length;
+}
+
+static void rb_advance_iter(struct ring_buffer_iter *iter)
+{
+ struct ring_buffer *buffer;
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_event *event;
+ unsigned length;
+
+ cpu_buffer = iter->cpu_buffer;
+ buffer = cpu_buffer->buffer;
+
+ /*
+ * Check if we are at the end of the buffer.
+ */
+ if (iter->head >= rb_page_size(iter->head_page)) {
+ BUG_ON(iter->head_page == cpu_buffer->commit_page);
+ rb_inc_iter(iter);
+ return;
+ }
+
+ event = rb_iter_head_event(iter);
+
+ length = rb_event_length(event);
+
+ /*
+ * This should not be called to advance the header if we are
+ * at the tail of the buffer.
+ */
+ BUG_ON((iter->head_page == cpu_buffer->commit_page) &&
+ (iter->head + length > rb_commit_index(cpu_buffer)));
+
+ rb_update_iter_read_stamp(iter, event);
+
+ iter->head += length;
+
+ /* check for end of page padding */
+ if ((iter->head >= rb_page_size(iter->head_page)) &&
+ (iter->head_page != cpu_buffer->commit_page))
+ rb_advance_iter(iter);
+}
+
+/**
+ * ring_buffer_peek - peek at the next event to be read
+ * @buffer: The ring buffer to read
+ * @cpu: The cpu to peak at
+ * @ts: The timestamp counter of this event.
+ *
+ * This will return the event that will be read next, but does
+ * not consume the data.
+ */
+struct ring_buffer_event *
+ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_event *event;
+ struct buffer_page *reader;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return NULL;
+
+ cpu_buffer = buffer->buffers[cpu];
+
+ again:
+ reader = rb_get_reader_page(cpu_buffer);
+ if (!reader)
+ return NULL;
+
+ event = rb_reader_event(cpu_buffer);
+
+ switch (event->type) {
+ case RINGBUF_TYPE_PADDING:
+ RB_WARN_ON(cpu_buffer, 1);
+ rb_advance_reader(cpu_buffer);
+ return NULL;
+
+ case RINGBUF_TYPE_TIME_EXTEND:
+ /* Internal data, OK to advance */
+ rb_advance_reader(cpu_buffer);
+ goto again;
+
+ case RINGBUF_TYPE_TIME_STAMP:
+ /* FIXME: not implemented */
+ rb_advance_reader(cpu_buffer);
+ goto again;
+
+ case RINGBUF_TYPE_DATA:
+ if (ts) {
+ *ts = cpu_buffer->read_stamp + event->time_delta;
+ ring_buffer_normalize_time_stamp(cpu_buffer->cpu, ts);
+ }
+ return event;
+
+ default:
+ BUG();
+ }
+
+ return NULL;
+}
+
+/**
+ * ring_buffer_iter_peek - peek at the next event to be read
+ * @iter: The ring buffer iterator
+ * @ts: The timestamp counter of this event.
+ *
+ * This will return the event that will be read next, but does
+ * not increment the iterator.
+ */
+struct ring_buffer_event *
+ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
+{
+ struct ring_buffer *buffer;
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_event *event;
+
+ if (ring_buffer_iter_empty(iter))
+ return NULL;
+
+ cpu_buffer = iter->cpu_buffer;
+ buffer = cpu_buffer->buffer;
+
+ again:
+ if (rb_per_cpu_empty(cpu_buffer))
+ return NULL;
+
+ event = rb_iter_head_event(iter);
+
+ switch (event->type) {
+ case RINGBUF_TYPE_PADDING:
+ rb_inc_iter(iter);
+ goto again;
+
+ case RINGBUF_TYPE_TIME_EXTEND:
+ /* Internal data, OK to advance */
+ rb_advance_iter(iter);
+ goto again;
+
+ case RINGBUF_TYPE_TIME_STAMP:
+ /* FIXME: not implemented */
+ rb_advance_iter(iter);
+ goto again;
+
+ case RINGBUF_TYPE_DATA:
+ if (ts) {
+ *ts = iter->read_stamp + event->time_delta;
+ ring_buffer_normalize_time_stamp(cpu_buffer->cpu, ts);
+ }
+ return event;
+
+ default:
+ BUG();
+ }
+
+ return NULL;
+}
+
+/**
+ * ring_buffer_consume - return an event and consume it
+ * @buffer: The ring buffer to get the next event from
+ *
+ * Returns the next event in the ring buffer, and that event is consumed.
+ * Meaning, that sequential reads will keep returning a different event,
+ * and eventually empty the ring buffer if the producer is slower.
+ */
+struct ring_buffer_event *
+ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_event *event;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return NULL;
+
+ event = ring_buffer_peek(buffer, cpu, ts);
+ if (!event)
+ return NULL;
+
+ cpu_buffer = buffer->buffers[cpu];
+ rb_advance_reader(cpu_buffer);
+
+ return event;
+}
+
+/**
+ * ring_buffer_read_start - start a non consuming read of the buffer
+ * @buffer: The ring buffer to read from
+ * @cpu: The cpu buffer to iterate over
+ *
+ * This starts up an iteration through the buffer. It also disables
+ * the recording to the buffer until the reading is finished.
+ * This prevents the reading from being corrupted. This is not
+ * a consuming read, so a producer is not expected.
+ *
+ * Must be paired with ring_buffer_finish.
+ */
+struct ring_buffer_iter *
+ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ struct ring_buffer_iter *iter;
+ unsigned long flags;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return NULL;
+
+ iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return NULL;
+
+ cpu_buffer = buffer->buffers[cpu];
+
+ iter->cpu_buffer = cpu_buffer;
+
+ atomic_inc(&cpu_buffer->record_disabled);
+ synchronize_sched();
+
+ spin_lock_irqsave(&cpu_buffer->lock, flags);
+ ring_buffer_iter_reset(iter);
+ spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+
+ return iter;
+}
+
+/**
+ * ring_buffer_finish - finish reading the iterator of the buffer
+ * @iter: The iterator retrieved by ring_buffer_start
+ *
+ * This re-enables the recording to the buffer, and frees the
+ * iterator.
+ */
+void
+ring_buffer_read_finish(struct ring_buffer_iter *iter)
+{
+ struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
+
+ atomic_dec(&cpu_buffer->record_disabled);
+ kfree(iter);
+}
+
+/**
+ * ring_buffer_read - read the next item in the ring buffer by the iterator
+ * @iter: The ring buffer iterator
+ * @ts: The time stamp of the event read.
+ *
+ * This reads the next event in the ring buffer and increments the iterator.
+ */
+struct ring_buffer_event *
+ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
+{
+ struct ring_buffer_event *event;
+
+ event = ring_buffer_iter_peek(iter, ts);
+ if (!event)
+ return NULL;
+
+ rb_advance_iter(iter);
+
+ return event;
+}
+
+/**
+ * ring_buffer_size - return the size of the ring buffer (in bytes)
+ * @buffer: The ring buffer.
+ */
+unsigned long ring_buffer_size(struct ring_buffer *buffer)
+{
+ return BUF_PAGE_SIZE * buffer->pages;
+}
+
+static void
+rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
+{
+ cpu_buffer->head_page
+ = list_entry(cpu_buffer->pages.next, struct buffer_page, list);
+ local_set(&cpu_buffer->head_page->write, 0);
+ local_set(&cpu_buffer->head_page->commit, 0);
+
+ cpu_buffer->head_page->read = 0;
+
+ cpu_buffer->tail_page = cpu_buffer->head_page;
+ cpu_buffer->commit_page = cpu_buffer->head_page;
+
+ INIT_LIST_HEAD(&cpu_buffer->reader_page->list);
+ local_set(&cpu_buffer->reader_page->write, 0);
+ local_set(&cpu_buffer->reader_page->commit, 0);
+ cpu_buffer->reader_page->read = 0;
+
+ cpu_buffer->overrun = 0;
+ cpu_buffer->entries = 0;
+}
+
+/**
+ * ring_buffer_reset_cpu - reset a ring buffer per CPU buffer
+ * @buffer: The ring buffer to reset a per cpu buffer of
+ * @cpu: The CPU buffer to be reset
+ */
+void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer = buffer->buffers[cpu];
+ unsigned long flags;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return;
+
+ spin_lock_irqsave(&cpu_buffer->lock, flags);
+
+ rb_reset_cpu(cpu_buffer);
+
+ spin_unlock_irqrestore(&cpu_buffer->lock, flags);
+}
+
+/**
+ * ring_buffer_reset - reset a ring buffer
+ * @buffer: The ring buffer to reset all cpu buffers
+ */
+void ring_buffer_reset(struct ring_buffer *buffer)
+{
+ int cpu;
+
+ for_each_buffer_cpu(buffer, cpu)
+ ring_buffer_reset_cpu(buffer, cpu);
+}
+
+/**
+ * rind_buffer_empty - is the ring buffer empty?
+ * @buffer: The ring buffer to test
+ */
+int ring_buffer_empty(struct ring_buffer *buffer)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+ int cpu;
+
+ /* yes this is racy, but if you don't like the race, lock the buffer */
+ for_each_buffer_cpu(buffer, cpu) {
+ cpu_buffer = buffer->buffers[cpu];
+ if (!rb_per_cpu_empty(cpu_buffer))
+ return 0;
+ }
+ return 1;
+}
+
+/**
+ * ring_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?
+ * @buffer: The ring buffer
+ * @cpu: The CPU buffer to test
+ */
+int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer;
+
+ if (!cpu_isset(cpu, buffer->cpumask))
+ return 1;
+
+ cpu_buffer = buffer->buffers[cpu];
+ return rb_per_cpu_empty(cpu_buffer);
+}
+
+/**
+ * ring_buffer_swap_cpu - swap a CPU buffer between two ring buffers
+ * @buffer_a: One buffer to swap with
+ * @buffer_b: The other buffer to swap with
+ *
+ * This function is useful for tracers that want to take a "snapshot"
+ * of a CPU buffer and has another back up buffer lying around.
+ * it is expected that the tracer handles the cpu buffer not being
+ * used at the moment.
+ */
+int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
+ struct ring_buffer *buffer_b, int cpu)
+{
+ struct ring_buffer_per_cpu *cpu_buffer_a;
+ struct ring_buffer_per_cpu *cpu_buffer_b;
+
+ if (!cpu_isset(cpu, buffer_a->cpumask) ||
+ !cpu_isset(cpu, buffer_b->cpumask))
+ return -EINVAL;
+
+ /* At least make sure the two buffers are somewhat the same */
+ if (buffer_a->size != buffer_b->size ||
+ buffer_a->pages != buffer_b->pages)
+ return -EINVAL;
+
+ cpu_buffer_a = buffer_a->buffers[cpu];
+ cpu_buffer_b = buffer_b->buffers[cpu];
+
+ /*
+ * We can't do a synchronize_sched here because this
+ * function can be called in atomic context.
+ * Normally this will be called from the same CPU as cpu.
+ * If not it's up to the caller to protect this.
+ */
+ atomic_inc(&cpu_buffer_a->record_disabled);
+ atomic_inc(&cpu_buffer_b->record_disabled);
+
+ buffer_a->buffers[cpu] = cpu_buffer_b;
+ buffer_b->buffers[cpu] = cpu_buffer_a;
+
+ cpu_buffer_b->buffer = buffer_a;
+ cpu_buffer_a->buffer = buffer_b;
+
+ atomic_dec(&cpu_buffer_a->record_disabled);
+ atomic_dec(&cpu_buffer_b->record_disabled);
+
+ return 0;
+}
+
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8f3fb3db61c..d345d649d07 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -14,6 +14,7 @@
#include <linux/utsrelease.h>
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
+#include <linux/notifier.h>
#include <linux/debugfs.h>
#include <linux/pagemap.h>
#include <linux/hardirq.h>
@@ -22,6 +23,7 @@
#include <linux/ftrace.h>
#include <linux/module.h>
#include <linux/percpu.h>
+#include <linux/kdebug.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/poll.h>
@@ -31,25 +33,36 @@
#include <linux/writeback.h>
#include <linux/stacktrace.h>
+#include <linux/ring_buffer.h>
#include "trace.h"
+#define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE)
+
unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX;
unsigned long __read_mostly tracing_thresh;
-static unsigned long __read_mostly tracing_nr_buffers;
+static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled);
+
+static inline void ftrace_disable_cpu(void)
+{
+ preempt_disable();
+ local_inc(&__get_cpu_var(ftrace_cpu_disabled));
+}
+
+static inline void ftrace_enable_cpu(void)
+{
+ local_dec(&__get_cpu_var(ftrace_cpu_disabled));
+ preempt_enable();
+}
+
static cpumask_t __read_mostly tracing_buffer_mask;
#define for_each_tracing_cpu(cpu) \
for_each_cpu_mask(cpu, tracing_buffer_mask)
-static int trace_alloc_page(void);
-static int trace_free_page(void);
-
static int tracing_disabled = 1;
-static unsigned long tracing_pages_allocated;
-
long
ns2usecs(cycle_t nsec)
{
@@ -60,7 +73,9 @@ ns2usecs(cycle_t nsec)
cycle_t ftrace_now(int cpu)
{
- return cpu_clock(cpu);
+ u64 ts = ring_buffer_time_stamp(cpu);
+ ring_buffer_normalize_time_stamp(cpu, &ts);
+ return ts;
}
/*
@@ -100,11 +115,18 @@ static int tracer_enabled = 1;
int ftrace_function_enabled;
/*
- * trace_nr_entries is the number of entries that is allocated
- * for a buffer. Note, the number of entries is always rounded
- * to ENTRIES_PER_PAGE.
+ * trace_buf_size is the size in bytes that is allocated
+ * for a buffer. Note, the number of bytes is always rounded
+ * to page size.
+ *
+ * This number is purposely set to a low number of 16384.
+ * If the dump on oops happens, it will be much appreciated
+ * to not have to wait for all that output. Anyway this can be
+ * boot time and run time configurable.
*/
-static unsigned long trace_nr_entries = 65536UL;
+#define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */
+
+static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT;
/* trace_types holds a link list of available tracers. */
static struct tracer *trace_types __read_mostly;
@@ -133,24 +155,6 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
/* trace_flags holds iter_ctrl options */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
-static notrace void no_trace_init(struct trace_array *tr)
-{
- int cpu;
-
- ftrace_function_enabled = 0;
- if(tr->ctrl)
- for_each_online_cpu(cpu)
- tracing_reset(tr->data[cpu]);
- tracer_enabled = 0;
-}
-
-/* dummy trace to disable tracing */
-static struct tracer no_tracer __read_mostly = {
- .name = "none",
- .init = no_trace_init
-};
-
-
/**
* trace_wake_up - wake up tasks waiting for trace input
*
@@ -167,23 +171,21 @@ void trace_wake_up(void)
wake_up(&trace_wait);
}
-#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry))
-
-static int __init set_nr_entries(char *str)
+static int __init set_buf_size(char *str)
{
- unsigned long nr_entries;
+ unsigned long buf_size;
int ret;
if (!str)
return 0;
- ret = strict_strtoul(str, 0, &nr_entries);
+ ret = strict_strtoul(str, 0, &buf_size);
/* nr_entries can not be zero */
- if (ret < 0 || nr_entries == 0)
+ if (ret < 0 || buf_size == 0)
return 0;
- trace_nr_entries = nr_entries;
+ trace_buf_size = buf_size;
return 1;
}
-__setup("trace_entries=", set_nr_entries);
+__setup("trace_buf_size=", set_buf_size);
unsigned long nsecs_to_usecs(unsigned long nsecs)
{
@@ -191,21 +193,6 @@ unsigned long nsecs_to_usecs(unsigned long nsecs)
}
/*
- * trace_flag_type is an enumeration that holds different
- * states when a trace occurs. These are:
- * IRQS_OFF - interrupts were disabled
- * NEED_RESCED - reschedule is requested
- * HARDIRQ - inside an interrupt handler
- * SOFTIRQ - inside a softirq handler
- */
-enum trace_flag_type {
- TRACE_FLAG_IRQS_OFF = 0x01,
- TRACE_FLAG_NEED_RESCHED = 0x02,
- TRACE_FLAG_HARDIRQ = 0x04,
- TRACE_FLAG_SOFTIRQ = 0x08,
-};
-
-/*
* TRACE_ITER_SYM_MASK masks the options in trace_flags that
* control the output of kernel symbols.
*/
@@ -224,6 +211,7 @@ static const char *trace_options[] = {
"block",
"stacktrace",
"sched-tree",
+ "ftrace_printk",
NULL
};
@@ -266,54 +254,6 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
tracing_record_cmdline(current);
}
-#define CHECK_COND(cond) \
- if (unlikely(cond)) { \
- tracing_disabled = 1; \
- WARN_ON(1); \
- return -1; \
- }
-
-/**
- * check_pages - integrity check of trace buffers
- *
- * As a safty measure we check to make sure the data pages have not
- * been corrupted.
- */
-int check_pages(struct trace_array_cpu *data)
-{
- struct page *page, *tmp;
-
- CHECK_COND(data->trace_pages.next->prev != &data->trace_pages);
- CHECK_COND(data->trace_pages.prev->next != &data->trace_pages);
-
- list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) {
- CHECK_COND(page->lru.next->prev != &page->lru);
- CHECK_COND(page->lru.prev->next != &page->lru);
- }
-
- return 0;
-}
-
-/**
- * head_page - page address of the first page in per_cpu buffer.
- *
- * head_page returns the page address of the first page in
- * a per_cpu buffer. This also preforms various consistency
- * checks to make sure the buffer has not been corrupted.
- */
-void *head_page(struct trace_array_cpu *data)
-{
- struct page *page;
-
- if (list_empty(&data->trace_pages))
- return NULL;
-
- page = list_entry(data->trace_pages.next, struct page, lru);
- BUG_ON(&page->lru == &data->trace_pages);
-
- return page_address(page);
-}
-
/**
* trace_seq_printf - sequence printing of trace information
* @s: trace sequence descriptor
@@ -395,28 +335,23 @@ trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
return len;
}
-#define HEX_CHARS 17
-static const char hex2asc[] = "0123456789abcdef";
+#define MAX_MEMHEX_BYTES 8
+#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
static int
trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
{
unsigned char hex[HEX_CHARS];
unsigned char *data = mem;
- unsigned char byte;
int i, j;
- BUG_ON(len >= HEX_CHARS);
-
#ifdef __BIG_ENDIAN
for (i = 0, j = 0; i < len; i++) {
#else
for (i = len-1, j = 0; i >= 0; i--) {
#endif
- byte = data[i];
-
- hex[j++] = hex2asc[byte & 0x0f];
- hex[j++] = hex2asc[byte >> 4];
+ hex[j++] = hex_asc_hi(data[i]);
+ hex[j++] = hex_asc_lo(data[i]);
}
hex[j++] = ' ';
@@ -460,34 +395,6 @@ trace_print_seq(struct seq_file *m, struct trace_seq *s)
trace_seq_reset(s);
}
-/*
- * flip the trace buffers between two trace descriptors.
- * This usually is the buffers between the global_trace and
- * the max_tr to record a snapshot of a current trace.
- *
- * The ftrace_max_lock must be held.
- */
-static void
-flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2)
-{
- struct list_head flip_pages;
-
- INIT_LIST_HEAD(&flip_pages);
-
- memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx,
- sizeof(struct trace_array_cpu) -
- offsetof(struct trace_array_cpu, trace_head_idx));
-
- check_pages(tr1);
- check_pages(tr2);
- list_splice_init(&tr1->trace_pages, &flip_pages);
- list_splice_init(&tr2->trace_pages, &tr1->trace_pages);
- list_splice_init(&flip_pages, &tr2->trace_pages);
- BUG_ON(!list_empty(&flip_pages));
- check_pages(tr1);
- check_pages(tr2);
-}
-
/**
* update_max_tr - snapshot all trace buffers from global_trace to max_tr
* @tr: tracer
@@ -500,17 +407,17 @@ flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2)
void
update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
- struct trace_array_cpu *data;
- int i;
+ struct ring_buffer *buf = tr->buffer;
WARN_ON_ONCE(!irqs_disabled());
__raw_spin_lock(&ftrace_max_lock);
- /* clear out all the previous traces */
- for_each_tracing_cpu(i) {
- data = tr->data[i];
- flip_trace(max_tr.data[i], data);
- tracing_reset(data);
- }
+
+ tr->buffer = max_tr.buffer;
+ max_tr.buffer = buf;
+
+ ftrace_disable_cpu();
+ ring_buffer_reset(tr->buffer);
+ ftrace_enable_cpu();
__update_max_tr(tr, tsk, cpu);
__raw_spin_unlock(&ftrace_max_lock);
@@ -527,16 +434,19 @@ update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
void
update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
{
- struct trace_array_cpu *data = tr->data[cpu];
- int i;
+ int ret;
WARN_ON_ONCE(!irqs_disabled());
__raw_spin_lock(&ftrace_max_lock);
- for_each_tracing_cpu(i)
- tracing_reset(max_tr.data[i]);
- flip_trace(max_tr.data[cpu], data);
- tracing_reset(data);
+ ftrace_disable_cpu();
+
+ ring_buffer_reset(max_tr.buffer);
+ ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu);
+
+ ftrace_enable_cpu();
+
+ WARN_ON_ONCE(ret);
__update_max_tr(tr, tsk, cpu);
__raw_spin_unlock(&ftrace_max_lock);
@@ -573,7 +483,6 @@ int register_tracer(struct tracer *type)
#ifdef CONFIG_FTRACE_STARTUP_TEST
if (type->selftest) {
struct tracer *saved_tracer = current_trace;
- struct trace_array_cpu *data;
struct trace_array *tr = &global_trace;
int saved_ctrl = tr->ctrl;
int i;
@@ -585,10 +494,7 @@ int register_tracer(struct tracer *type)
* If we fail, we do not register this tracer.
*/
for_each_tracing_cpu(i) {
- data = tr->data[i];
- if (!head_page(data))
- continue;
- tracing_reset(data);
+ tracing_reset(tr, i);
}
current_trace = type;
tr->ctrl = 0;
@@ -604,10 +510,7 @@ int register_tracer(struct tracer *type)
}
/* Only reset on passing, to avoid touching corrupted buffers */
for_each_tracing_cpu(i) {
- data = tr->data[i];
- if (!head_page(data))
- continue;
- tracing_reset(data);
+ tracing_reset(tr, i);
}
printk(KERN_CONT "PASSED\n");
}
@@ -653,13 +556,11 @@ void unregister_tracer(struct tracer *type)
mutex_unlock(&trace_types_lock);
}
-void tracing_reset(struct trace_array_cpu *data)
+void tracing_reset(struct trace_array *tr, int cpu)
{
- data->trace_idx = 0;
- data->overrun = 0;
- data->trace_head = data->trace_tail = head_page(data);
- data->trace_head_idx = 0;
- data->trace_tail_idx = 0;
+ ftrace_disable_cpu();
+ ring_buffer_reset_cpu(tr->buffer, cpu);
+ ftrace_enable_cpu();
}
#define SAVED_CMDLINES 128
@@ -745,82 +646,16 @@ void tracing_record_cmdline(struct task_struct *tsk)
trace_save_cmdline(tsk);
}
-static inline struct list_head *
-trace_next_list(struct trace_array_cpu *data, struct list_head *next)
-{
- /*
- * Roundrobin - but skip the head (which is not a real page):
- */
- next = next->next;
- if (unlikely(next == &data->trace_pages))
- next = next->next;
- BUG_ON(next == &data->trace_pages);
-
- return next;
-}
-
-static inline void *
-trace_next_page(struct trace_array_cpu *data, void *addr)
-{
- struct list_head *next;
- struct page *page;
-
- page = virt_to_page(addr);
-
- next = trace_next_list(data, &page->lru);
- page = list_entry(next, struct page, lru);
-
- return page_address(page);
-}
-
-static inline struct trace_entry *
-tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data)
-{
- unsigned long idx, idx_next;
- struct trace_entry *entry;
-
- data->trace_idx++;
- idx = data->trace_head_idx;
- idx_next = idx + 1;
-
- BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE);
-
- entry = data->trace_head + idx * TRACE_ENTRY_SIZE;
-
- if (unlikely(idx_next >= ENTRIES_PER_PAGE)) {
- data->trace_head = trace_next_page(data, data->trace_head);
- idx_next = 0;
- }
-
- if (data->trace_head == data->trace_tail &&
- idx_next == data->trace_tail_idx) {
- /* overrun */
- data->overrun++;
- data->trace_tail_idx++;
- if (data->trace_tail_idx >= ENTRIES_PER_PAGE) {
- data->trace_tail =
- trace_next_page(data, data->trace_tail);
- data->trace_tail_idx = 0;
- }
- }
-
- data->trace_head_idx = idx_next;
-
- return entry;
-}
-
-static inline void
-tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
+void
+tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
+ int pc)
{
struct task_struct *tsk = current;
- unsigned long pc;
-
- pc = preempt_count();
- entry->preempt_count = pc & 0xff;
- entry->pid = (tsk) ? tsk->pid : 0;
- entry->t = ftrace_now(raw_smp_processor_id());
- entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
+ entry->preempt_count = pc & 0xff;
+ entry->pid = (tsk) ? tsk->pid : 0;
+ entry->flags =
+ (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
(need_resched() ? TRACE_FLAG_NEED_RESCHED : 0);
@@ -828,145 +663,139 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags)
void
trace_function(struct trace_array *tr, struct trace_array_cpu *data,
- unsigned long ip, unsigned long parent_ip, unsigned long flags)
+ unsigned long ip, unsigned long parent_ip, unsigned long flags,
+ int pc)
{
- struct trace_entry *entry;
+ struct ring_buffer_event *event;
+ struct ftrace_entry *entry;
unsigned long irq_flags;
- raw_local_irq_save(irq_flags);
- __raw_spin_lock(&data->lock);
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, flags);
- entry->type = TRACE_FN;
- entry->fn.ip = ip;
- entry->fn.parent_ip = parent_ip;
- __raw_spin_unlock(&data->lock);
- raw_local_irq_restore(irq_flags);
+ /* If we are reading the ring buffer, don't trace */
+ if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+ return;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, flags, pc);
+ entry->ent.type = TRACE_FN;
+ entry->ip = ip;
+ entry->parent_ip = parent_ip;
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
}
void
ftrace(struct trace_array *tr, struct trace_array_cpu *data,
- unsigned long ip, unsigned long parent_ip, unsigned long flags)
+ unsigned long ip, unsigned long parent_ip, unsigned long flags,
+ int pc)
{
if (likely(!atomic_read(&data->disabled)))
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, data, ip, parent_ip, flags, pc);
}
-#ifdef CONFIG_MMIOTRACE
-void __trace_mmiotrace_rw(struct trace_array *tr, struct trace_array_cpu *data,
- struct mmiotrace_rw *rw)
+static void ftrace_trace_stack(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ unsigned long flags,
+ int skip, int pc)
{
- struct trace_entry *entry;
+ struct ring_buffer_event *event;
+ struct stack_entry *entry;
+ struct stack_trace trace;
unsigned long irq_flags;
- raw_local_irq_save(irq_flags);
- __raw_spin_lock(&data->lock);
-
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, 0);
- entry->type = TRACE_MMIO_RW;
- entry->mmiorw = *rw;
-
- __raw_spin_unlock(&data->lock);
- raw_local_irq_restore(irq_flags);
-
- trace_wake_up();
-}
-
-void __trace_mmiotrace_map(struct trace_array *tr, struct trace_array_cpu *data,
- struct mmiotrace_map *map)
-{
- struct trace_entry *entry;
- unsigned long irq_flags;
+ if (!(trace_flags & TRACE_ITER_STACKTRACE))
+ return;
- raw_local_irq_save(irq_flags);
- __raw_spin_lock(&data->lock);
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, flags, pc);
+ entry->ent.type = TRACE_STACK;
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, 0);
- entry->type = TRACE_MMIO_MAP;
- entry->mmiomap = *map;
+ memset(&entry->caller, 0, sizeof(entry->caller));
- __raw_spin_unlock(&data->lock);
- raw_local_irq_restore(irq_flags);
+ trace.nr_entries = 0;
+ trace.max_entries = FTRACE_STACK_ENTRIES;
+ trace.skip = skip;
+ trace.entries = entry->caller;
- trace_wake_up();
+ save_stack_trace(&trace);
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
}
-#endif
void __trace_stack(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long flags,
int skip)
{
- struct trace_entry *entry;
- struct stack_trace trace;
-
- if (!(trace_flags & TRACE_ITER_STACKTRACE))
- return;
-
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, flags);
- entry->type = TRACE_STACK;
-
- memset(&entry->stack, 0, sizeof(entry->stack));
-
- trace.nr_entries = 0;
- trace.max_entries = FTRACE_STACK_ENTRIES;
- trace.skip = skip;
- trace.entries = entry->stack.caller;
-
- save_stack_trace(&trace);
+ ftrace_trace_stack(tr, data, flags, skip, preempt_count());
}
-void
-__trace_special(void *__tr, void *__data,
- unsigned long arg1, unsigned long arg2, unsigned long arg3)
+static void
+ftrace_trace_special(void *__tr, void *__data,
+ unsigned long arg1, unsigned long arg2, unsigned long arg3,
+ int pc)
{
+ struct ring_buffer_event *event;
struct trace_array_cpu *data = __data;
struct trace_array *tr = __tr;
- struct trace_entry *entry;
+ struct special_entry *entry;
unsigned long irq_flags;
- raw_local_irq_save(irq_flags);
- __raw_spin_lock(&data->lock);
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, 0);
- entry->type = TRACE_SPECIAL;
- entry->special.arg1 = arg1;
- entry->special.arg2 = arg2;
- entry->special.arg3 = arg3;
- __trace_stack(tr, data, irq_flags, 4);
- __raw_spin_unlock(&data->lock);
- raw_local_irq_restore(irq_flags);
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, pc);
+ entry->ent.type = TRACE_SPECIAL;
+ entry->arg1 = arg1;
+ entry->arg2 = arg2;
+ entry->arg3 = arg3;
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ ftrace_trace_stack(tr, data, irq_flags, 4, pc);
trace_wake_up();
}
void
+__trace_special(void *__tr, void *__data,
+ unsigned long arg1, unsigned long arg2, unsigned long arg3)
+{
+ ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count());
+}
+
+void
tracing_sched_switch_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *prev,
struct task_struct *next,
- unsigned long flags)
+ unsigned long flags, int pc)
{
- struct trace_entry *entry;
+ struct ring_buffer_event *event;
+ struct ctx_switch_entry *entry;
unsigned long irq_flags;
- raw_local_irq_save(irq_flags);
- __raw_spin_lock(&data->lock);
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, flags);
- entry->type = TRACE_CTX;
- entry->ctx.prev_pid = prev->pid;
- entry->ctx.prev_prio = prev->prio;
- entry->ctx.prev_state = prev->state;
- entry->ctx.next_pid = next->pid;
- entry->ctx.next_prio = next->prio;
- entry->ctx.next_state = next->state;
- __trace_stack(tr, data, flags, 5);
- __raw_spin_unlock(&data->lock);
- raw_local_irq_restore(irq_flags);
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, flags, pc);
+ entry->ent.type = TRACE_CTX;
+ entry->prev_pid = prev->pid;
+ entry->prev_prio = prev->prio;
+ entry->prev_state = prev->state;
+ entry->next_pid = next->pid;
+ entry->next_prio = next->prio;
+ entry->next_state = next->state;
+ entry->next_cpu = task_cpu(next);
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ ftrace_trace_stack(tr, data, flags, 5, pc);
}
void
@@ -974,25 +803,28 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *wakee,
struct task_struct *curr,
- unsigned long flags)
+ unsigned long flags, int pc)
{
- struct trace_entry *entry;
+ struct ring_buffer_event *event;
+ struct ctx_switch_entry *entry;
unsigned long irq_flags;
- raw_local_irq_save(irq_flags);
- __raw_spin_lock(&data->lock);
- entry = tracing_get_trace_entry(tr, data);
- tracing_generic_entry_update(entry, flags);
- entry->type = TRACE_WAKE;
- entry->ctx.prev_pid = curr->pid;
- entry->ctx.prev_prio = curr->prio;
- entry->ctx.prev_state = curr->state;
- entry->ctx.next_pid = wakee->pid;
- entry->ctx.next_prio = wakee->prio;
- entry->ctx.next_state = wakee->state;
- __trace_stack(tr, data, flags, 6);
- __raw_spin_unlock(&data->lock);
- raw_local_irq_restore(irq_flags);
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, flags, pc);
+ entry->ent.type = TRACE_WAKE;
+ entry->prev_pid = curr->pid;
+ entry->prev_prio = curr->prio;
+ entry->prev_state = curr->state;
+ entry->next_pid = wakee->pid;
+ entry->next_prio = wakee->prio;
+ entry->next_state = wakee->state;
+ entry->next_cpu = task_cpu(wakee);
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+ ftrace_trace_stack(tr, data, flags, 6, pc);
trace_wake_up();
}
@@ -1002,23 +834,21 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
{
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
- unsigned long flags;
- long disabled;
int cpu;
+ int pc;
- if (tracing_disabled || current_trace == &no_tracer || !tr->ctrl)
+ if (tracing_disabled || !tr->ctrl)
return;
- local_irq_save(flags);
+ pc = preempt_count();
+ preempt_disable_notrace();
cpu = raw_smp_processor_id();
data = tr->data[cpu];
- disabled = atomic_inc_return(&data->disabled);
- if (likely(disabled == 1))
- __trace_special(tr, data, arg1, arg2, arg3);
+ if (likely(!atomic_read(&data->disabled)))
+ ftrace_trace_special(tr, data, arg1, arg2, arg3, pc);
- atomic_dec(&data->disabled);
- local_irq_restore(flags);
+ preempt_enable_notrace();
}
#ifdef CONFIG_FTRACE
@@ -1029,7 +859,8 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
- int cpu;
+ int cpu, resched;
+ int pc;
if (unlikely(!ftrace_function_enabled))
return;
@@ -1037,16 +868,22 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
if (skip_trace(ip))
return;
- local_irq_save(flags);
+ pc = preempt_count();
+ resched = need_resched();
+ preempt_disable_notrace();
+ local_save_flags(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, data, ip, parent_ip, flags, pc);
atomic_dec(&data->disabled);
- local_irq_restore(flags);
+ if (resched)
+ preempt_enable_no_resched_notrace();
+ else
+ preempt_enable_notrace();
}
static struct ftrace_ops trace_ops __read_mostly =
@@ -1073,111 +910,96 @@ enum trace_file_type {
TRACE_FILE_LAT_FMT = 1,
};
-static struct trace_entry *
-trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data,
- struct trace_iterator *iter, int cpu)
+static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
{
- struct page *page;
- struct trace_entry *array;
+ /* Don't allow ftrace to trace into the ring buffers */
+ ftrace_disable_cpu();
- if (iter->next_idx[cpu] >= tr->entries ||
- iter->next_idx[cpu] >= data->trace_idx ||
- (data->trace_head == data->trace_tail &&
- data->trace_head_idx == data->trace_tail_idx))
- return NULL;
+ iter->idx++;
+ if (iter->buffer_iter[iter->cpu])
+ ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
- if (!iter->next_page[cpu]) {
- /* Initialize the iterator for this cpu trace buffer */
- WARN_ON(!data->trace_tail);
- page = virt_to_page(data->trace_tail);
- iter->next_page[cpu] = &page->lru;
- iter->next_page_idx[cpu] = data->trace_tail_idx;
- }
+ ftrace_enable_cpu();
+}
+
+static struct trace_entry *
+peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts)
+{
+ struct ring_buffer_event *event;
+ struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu];
- page = list_entry(iter->next_page[cpu], struct page, lru);
- BUG_ON(&data->trace_pages == &page->lru);
+ /* Don't allow ftrace to trace into the ring buffers */
+ ftrace_disable_cpu();
+
+ if (buf_iter)
+ event = ring_buffer_iter_peek(buf_iter, ts);
+ else
+ event = ring_buffer_peek(iter->tr->buffer, cpu, ts);
- array = page_address(page);
+ ftrace_enable_cpu();
- WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE);
- return &array[iter->next_page_idx[cpu]];
+ return event ? ring_buffer_event_data(event) : NULL;
}
static struct trace_entry *
-find_next_entry(struct trace_iterator *iter, int *ent_cpu)
+__find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
{
- struct trace_array *tr = iter->tr;
+ struct ring_buffer *buffer = iter->tr->buffer;
struct trace_entry *ent, *next = NULL;
+ u64 next_ts = 0, ts;
int next_cpu = -1;
int cpu;
for_each_tracing_cpu(cpu) {
- if (!head_page(tr->data[cpu]))
+
+ if (ring_buffer_empty_cpu(buffer, cpu))
continue;
- ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu);
+
+ ent = peek_next_entry(iter, cpu, &ts);
+
/*
* Pick the entry with the smallest timestamp:
*/
- if (ent && (!next || ent->t < next->t)) {
+ if (ent && (!next || ts < next_ts)) {
next = ent;
next_cpu = cpu;
+ next_ts = ts;
}
}
if (ent_cpu)
*ent_cpu = next_cpu;
+ if (ent_ts)
+ *ent_ts = next_ts;
+
return next;
}
-static void trace_iterator_increment(struct trace_iterator *iter)
+/* Find the next real entry, without updating the iterator itself */
+static struct trace_entry *
+find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts)
{
- iter->idx++;
- iter->next_idx[iter->cpu]++;
- iter->next_page_idx[iter->cpu]++;
-
- if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) {
- struct trace_array_cpu *data = iter->tr->data[iter->cpu];
-
- iter->next_page_idx[iter->cpu] = 0;
- iter->next_page[iter->cpu] =
- trace_next_list(data, iter->next_page[iter->cpu]);
- }
+ return __find_next_entry(iter, ent_cpu, ent_ts);
}
-static void trace_consume(struct trace_iterator *iter)
+/* Find the next real entry, and increment the iterator to the next entry */
+static void *find_next_entry_inc(struct trace_iterator *iter)
{
- struct trace_array_cpu *data = iter->tr->data[iter->cpu];
+ iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts);
- data->trace_tail_idx++;
- if (data->trace_tail_idx >= ENTRIES_PER_PAGE) {
- data->trace_tail = trace_next_page(data, data->trace_tail);
- data->trace_tail_idx = 0;
- }
+ if (iter->ent)
+ trace_iterator_increment(iter, iter->cpu);
- /* Check if we empty it, then reset the index */
- if (data->trace_head == data->trace_tail &&
- data->trace_head_idx == data->trace_tail_idx)
- data->trace_idx = 0;
+ return iter->ent ? iter : NULL;
}
-static void *find_next_entry_inc(struct trace_iterator *iter)
+static void trace_consume(struct trace_iterator *iter)
{
- struct trace_entry *next;
- int next_cpu = -1;
-
- next = find_next_entry(iter, &next_cpu);
-
- iter->prev_ent = iter->ent;
- iter->prev_cpu = iter->cpu;
-
- iter->ent = next;
- iter->cpu = next_cpu;
-
- if (next)
- trace_iterator_increment(iter);
-
- return next ? iter : NULL;
+ /* Don't allow ftrace to trace into the ring buffers */
+ ftrace_disable_cpu();
+ ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts);
+ ftrace_enable_cpu();
}
static void *s_next(struct seq_file *m, void *v, loff_t *pos)
@@ -1210,7 +1032,7 @@ static void *s_start(struct seq_file *m, loff_t *pos)
struct trace_iterator *iter = m->private;
void *p = NULL;
loff_t l = 0;
- int i;
+ int cpu;
mutex_lock(&trace_types_lock);
@@ -1229,14 +1051,15 @@ static void *s_start(struct seq_file *m, loff_t *pos)
iter->ent = NULL;
iter->cpu = 0;
iter->idx = -1;
- iter->prev_ent = NULL;
- iter->prev_cpu = -1;
- for_each_tracing_cpu(i) {
- iter->next_idx[i] = 0;
- iter->next_page[i] = NULL;
+ ftrace_disable_cpu();
+
+ for_each_tracing_cpu(cpu) {
+ ring_buffer_iter_reset(iter->buffer_iter[cpu]);
}
+ ftrace_enable_cpu();
+
for (p = iter; p && l < *pos; p = s_next(m, p, &l))
;
@@ -1330,21 +1153,21 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
static void print_lat_help_header(struct seq_file *m)
{
- seq_puts(m, "# _------=> CPU# \n");
- seq_puts(m, "# / _-----=> irqs-off \n");
- seq_puts(m, "# | / _----=> need-resched \n");
- seq_puts(m, "# || / _---=> hardirq/softirq \n");
- seq_puts(m, "# ||| / _--=> preempt-depth \n");
- seq_puts(m, "# |||| / \n");
- seq_puts(m, "# ||||| delay \n");
- seq_puts(m, "# cmd pid ||||| time | caller \n");
- seq_puts(m, "# \\ / ||||| \\ | / \n");
+ seq_puts(m, "# _------=> CPU# \n");
+ seq_puts(m, "# / _-----=> irqs-off \n");
+ seq_puts(m, "# | / _----=> need-resched \n");
+ seq_puts(m, "# || / _---=> hardirq/softirq \n");
+ seq_puts(m, "# ||| / _--=> preempt-depth \n");
+ seq_puts(m, "# |||| / \n");
+ seq_puts(m, "# ||||| delay \n");
+ seq_puts(m, "# cmd pid ||||| time | caller \n");
+ seq_puts(m, "# \\ / ||||| \\ | / \n");
}
static void print_func_help_header(struct seq_file *m)
{
- seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n");
- seq_puts(m, "# | | | | |\n");
+ seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n");
+ seq_puts(m, "# | | | | |\n");
}
@@ -1355,23 +1178,16 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
struct trace_array *tr = iter->tr;
struct trace_array_cpu *data = tr->data[tr->cpu];
struct tracer *type = current_trace;
- unsigned long total = 0;
- unsigned long entries = 0;
- int cpu;
+ unsigned long total;
+ unsigned long entries;
const char *name = "preemption";
if (type)
name = type->name;
- for_each_tracing_cpu(cpu) {
- if (head_page(tr->data[cpu])) {
- total += tr->data[cpu]->trace_idx;
- if (tr->data[cpu]->trace_idx > tr->entries)
- entries += tr->entries;
- else
- entries += tr->data[cpu]->trace_idx;
- }
- }
+ entries = ring_buffer_entries(iter->tr->buffer);
+ total = entries +
+ ring_buffer_overruns(iter->tr->buffer);
seq_printf(m, "%s latency trace v1.1.5 on %s\n",
name, UTS_RELEASE);
@@ -1428,7 +1244,7 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
comm = trace_find_cmdline(entry->pid);
trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid);
- trace_seq_printf(s, "%d", cpu);
+ trace_seq_printf(s, "%3d", cpu);
trace_seq_printf(s, "%c%c",
(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.',
((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
@@ -1457,7 +1273,7 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
unsigned long preempt_mark_thresh = 100;
static void
-lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs,
+lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
unsigned long rel_usecs)
{
trace_seq_printf(s, " %4lldus", abs_usecs);
@@ -1471,34 +1287,76 @@ lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs,
static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
-static int
+/*
+ * The message is supposed to contain an ending newline.
+ * If the printing stops prematurely, try to add a newline of our own.
+ */
+void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
+{
+ struct trace_entry *ent;
+ struct trace_field_cont *cont;
+ bool ok = true;
+
+ ent = peek_next_entry(iter, iter->cpu, NULL);
+ if (!ent || ent->type != TRACE_CONT) {
+ trace_seq_putc(s, '\n');
+ return;
+ }
+
+ do {
+ cont = (struct trace_field_cont *)ent;
+ if (ok)
+ ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
+
+ ftrace_disable_cpu();
+
+ if (iter->buffer_iter[iter->cpu])
+ ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
+ else
+ ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
+
+ ftrace_enable_cpu();
+
+ ent = peek_next_entry(iter, iter->cpu, NULL);
+ } while (ent && ent->type == TRACE_CONT);
+
+ if (!ok)
+ trace_seq_putc(s, '\n');
+}
+
+static enum print_line_t
print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
{
struct trace_seq *s = &iter->seq;
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
- struct trace_entry *next_entry = find_next_entry(iter, NULL);
+ struct trace_entry *next_entry;
unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
struct trace_entry *entry = iter->ent;
unsigned long abs_usecs;
unsigned long rel_usecs;
+ u64 next_ts;
char *comm;
int S, T;
int i;
unsigned state;
+ if (entry->type == TRACE_CONT)
+ return TRACE_TYPE_HANDLED;
+
+ next_entry = find_next_entry(iter, NULL, &next_ts);
if (!next_entry)
- next_entry = entry;
- rel_usecs = ns2usecs(next_entry->t - entry->t);
- abs_usecs = ns2usecs(entry->t - iter->tr->time_start);
+ next_ts = iter->ts;
+ rel_usecs = ns2usecs(next_ts - iter->ts);
+ abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
if (verbose) {
comm = trace_find_cmdline(entry->pid);
- trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]"
+ trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]"
" %ld.%03ldms (+%ld.%03ldms): ",
comm,
entry->pid, cpu, entry->flags,
entry->preempt_count, trace_idx,
- ns2usecs(entry->t),
+ ns2usecs(iter->ts),
abs_usecs/1000,
abs_usecs % 1000, rel_usecs/1000,
rel_usecs % 1000);
@@ -1507,52 +1365,85 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
lat_print_timestamp(s, abs_usecs, rel_usecs);
}
switch (entry->type) {
- case TRACE_FN:
- seq_print_ip_sym(s, entry->fn.ip, sym_flags);
+ case TRACE_FN: {
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ seq_print_ip_sym(s, field->ip, sym_flags);
trace_seq_puts(s, " (");
- if (kretprobed(entry->fn.parent_ip))
+ if (kretprobed(field->parent_ip))
trace_seq_puts(s, KRETPROBE_MSG);
else
- seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags);
+ seq_print_ip_sym(s, field->parent_ip, sym_flags);
trace_seq_puts(s, ")\n");
break;
+ }
case TRACE_CTX:
- case TRACE_WAKE:
- T = entry->ctx.next_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.next_state] : 'X';
+ case TRACE_WAKE: {
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ T = field->next_state < sizeof(state_to_char) ?
+ state_to_char[field->next_state] : 'X';
- state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0;
+ state = field->prev_state ?
+ __ffs(field->prev_state) + 1 : 0;
S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
- comm = trace_find_cmdline(entry->ctx.next_pid);
- trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n",
- entry->ctx.prev_pid,
- entry->ctx.prev_prio,
+ comm = trace_find_cmdline(field->next_pid);
+ trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
+ field->prev_pid,
+ field->prev_prio,
S, entry->type == TRACE_CTX ? "==>" : " +",
- entry->ctx.next_pid,
- entry->ctx.next_prio,
+ field->next_cpu,
+ field->next_pid,
+ field->next_prio,
T, comm);
break;
- case TRACE_SPECIAL:
+ }
+ case TRACE_SPECIAL: {
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
trace_seq_printf(s, "# %ld %ld %ld\n",
- entry->special.arg1,
- entry->special.arg2,
- entry->special.arg3);
+ field->arg1,
+ field->arg2,
+ field->arg3);
break;
- case TRACE_STACK:
+ }
+ case TRACE_STACK: {
+ struct stack_entry *field;
+
+ trace_assign_type(field, entry);
+
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
if (i)
trace_seq_puts(s, " <= ");
- seq_print_ip_sym(s, entry->stack.caller[i], sym_flags);
+ seq_print_ip_sym(s, field->caller[i], sym_flags);
}
trace_seq_puts(s, "\n");
break;
+ }
+ case TRACE_PRINT: {
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ seq_print_ip_sym(s, field->ip, sym_flags);
+ trace_seq_printf(s, ": %s", field->buf);
+ if (entry->flags & TRACE_FLAG_CONT)
+ trace_seq_print_cont(s, iter);
+ break;
+ }
default:
trace_seq_printf(s, "Unknown type %d\n", entry->type);
}
- return 1;
+ return TRACE_TYPE_HANDLED;
}
-static int print_trace_fmt(struct trace_iterator *iter)
+static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
@@ -1567,90 +1458,126 @@ static int print_trace_fmt(struct trace_iterator *iter)
entry = iter->ent;
+ if (entry->type == TRACE_CONT)
+ return TRACE_TYPE_HANDLED;
+
comm = trace_find_cmdline(iter->ent->pid);
- t = ns2usecs(entry->t);
+ t = ns2usecs(iter->ts);
usec_rem = do_div(t, 1000000ULL);
secs = (unsigned long)t;
ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
if (!ret)
- return 0;
- ret = trace_seq_printf(s, "[%02d] ", iter->cpu);
+ return TRACE_TYPE_PARTIAL_LINE;
+ ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
switch (entry->type) {
- case TRACE_FN:
- ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags);
+ case TRACE_FN: {
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ ret = seq_print_ip_sym(s, field->ip, sym_flags);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
if ((sym_flags & TRACE_ITER_PRINT_PARENT) &&
- entry->fn.parent_ip) {
+ field->parent_ip) {
ret = trace_seq_printf(s, " <-");
if (!ret)
- return 0;
- if (kretprobed(entry->fn.parent_ip))
+ return TRACE_TYPE_PARTIAL_LINE;
+ if (kretprobed(field->parent_ip))
ret = trace_seq_puts(s, KRETPROBE_MSG);
else
- ret = seq_print_ip_sym(s, entry->fn.parent_ip,
+ ret = seq_print_ip_sym(s,
+ field->parent_ip,
sym_flags);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
}
ret = trace_seq_printf(s, "\n");
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
+ }
case TRACE_CTX:
- case TRACE_WAKE:
- S = entry->ctx.prev_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.prev_state] : 'X';
- T = entry->ctx.next_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.next_state] : 'X';
- ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n",
- entry->ctx.prev_pid,
- entry->ctx.prev_prio,
+ case TRACE_WAKE: {
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ S = field->prev_state < sizeof(state_to_char) ?
+ state_to_char[field->prev_state] : 'X';
+ T = field->next_state < sizeof(state_to_char) ?
+ state_to_char[field->next_state] : 'X';
+ ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
+ field->prev_pid,
+ field->prev_prio,
S,
entry->type == TRACE_CTX ? "==>" : " +",
- entry->ctx.next_pid,
- entry->ctx.next_prio,
+ field->next_cpu,
+ field->next_pid,
+ field->next_prio,
T);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
- case TRACE_SPECIAL:
+ }
+ case TRACE_SPECIAL: {
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
ret = trace_seq_printf(s, "# %ld %ld %ld\n",
- entry->special.arg1,
- entry->special.arg2,
- entry->special.arg3);
+ field->arg1,
+ field->arg2,
+ field->arg3);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
- case TRACE_STACK:
+ }
+ case TRACE_STACK: {
+ struct stack_entry *field;
+
+ trace_assign_type(field, entry);
+
for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
if (i) {
ret = trace_seq_puts(s, " <= ");
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
}
- ret = seq_print_ip_sym(s, entry->stack.caller[i],
+ ret = seq_print_ip_sym(s, field->caller[i],
sym_flags);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
}
ret = trace_seq_puts(s, "\n");
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
}
- return 1;
+ case TRACE_PRINT: {
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ seq_print_ip_sym(s, field->ip, sym_flags);
+ trace_seq_printf(s, ": %s", field->buf);
+ if (entry->flags & TRACE_FLAG_CONT)
+ trace_seq_print_cont(s, iter);
+ break;
+ }
+ }
+ return TRACE_TYPE_HANDLED;
}
-static int print_raw_fmt(struct trace_iterator *iter)
+static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
@@ -1659,47 +1586,77 @@ static int print_raw_fmt(struct trace_iterator *iter)
entry = iter->ent;
+ if (entry->type == TRACE_CONT)
+ return TRACE_TYPE_HANDLED;
+
ret = trace_seq_printf(s, "%d %d %llu ",
- entry->pid, iter->cpu, entry->t);
+ entry->pid, iter->cpu, iter->ts);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
switch (entry->type) {
- case TRACE_FN:
+ case TRACE_FN: {
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
ret = trace_seq_printf(s, "%x %x\n",
- entry->fn.ip, entry->fn.parent_ip);
+ field->ip,
+ field->parent_ip);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
+ }
case TRACE_CTX:
- case TRACE_WAKE:
- S = entry->ctx.prev_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.prev_state] : 'X';
- T = entry->ctx.next_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.next_state] : 'X';
+ case TRACE_WAKE: {
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ S = field->prev_state < sizeof(state_to_char) ?
+ state_to_char[field->prev_state] : 'X';
+ T = field->next_state < sizeof(state_to_char) ?
+ state_to_char[field->next_state] : 'X';
if (entry->type == TRACE_WAKE)
S = '+';
- ret = trace_seq_printf(s, "%d %d %c %d %d %c\n",
- entry->ctx.prev_pid,
- entry->ctx.prev_prio,
+ ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
+ field->prev_pid,
+ field->prev_prio,
S,
- entry->ctx.next_pid,
- entry->ctx.next_prio,
+ field->next_cpu,
+ field->next_pid,
+ field->next_prio,
T);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
+ }
case TRACE_SPECIAL:
- case TRACE_STACK:
+ case TRACE_STACK: {
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
ret = trace_seq_printf(s, "# %ld %ld %ld\n",
- entry->special.arg1,
- entry->special.arg2,
- entry->special.arg3);
+ field->arg1,
+ field->arg2,
+ field->arg3);
if (!ret)
- return 0;
+ return TRACE_TYPE_PARTIAL_LINE;
break;
}
- return 1;
+ case TRACE_PRINT: {
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
+ if (entry->flags & TRACE_FLAG_CONT)
+ trace_seq_print_cont(s, iter);
+ break;
+ }
+ }
+ return TRACE_TYPE_HANDLED;
}
#define SEQ_PUT_FIELD_RET(s, x) \
@@ -1710,11 +1667,12 @@ do { \
#define SEQ_PUT_HEX_FIELD_RET(s, x) \
do { \
+ BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
return 0; \
} while (0)
-static int print_hex_fmt(struct trace_iterator *iter)
+static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
unsigned char newline = '\n';
@@ -1723,97 +1681,139 @@ static int print_hex_fmt(struct trace_iterator *iter)
entry = iter->ent;
+ if (entry->type == TRACE_CONT)
+ return TRACE_TYPE_HANDLED;
+
SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
- SEQ_PUT_HEX_FIELD_RET(s, entry->t);
+ SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
switch (entry->type) {
- case TRACE_FN:
- SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip);
- SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
+ case TRACE_FN: {
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_HEX_FIELD_RET(s, field->ip);
+ SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
break;
+ }
case TRACE_CTX:
- case TRACE_WAKE:
- S = entry->ctx.prev_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.prev_state] : 'X';
- T = entry->ctx.next_state < sizeof(state_to_char) ?
- state_to_char[entry->ctx.next_state] : 'X';
+ case TRACE_WAKE: {
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ S = field->prev_state < sizeof(state_to_char) ?
+ state_to_char[field->prev_state] : 'X';
+ T = field->next_state < sizeof(state_to_char) ?
+ state_to_char[field->next_state] : 'X';
if (entry->type == TRACE_WAKE)
S = '+';
- SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid);
- SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio);
+ SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
+ SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
SEQ_PUT_HEX_FIELD_RET(s, S);
- SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid);
- SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio);
- SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip);
+ SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
+ SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
+ SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
SEQ_PUT_HEX_FIELD_RET(s, T);
break;
+ }
case TRACE_SPECIAL:
- case TRACE_STACK:
- SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1);
- SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2);
- SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3);
+ case TRACE_STACK: {
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
+ SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
+ SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
break;
}
+ }
SEQ_PUT_FIELD_RET(s, newline);
- return 1;
+ return TRACE_TYPE_HANDLED;
}
-static int print_bin_fmt(struct trace_iterator *iter)
+static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
entry = iter->ent;
+ if (entry->type == TRACE_CONT)
+ return TRACE_TYPE_HANDLED;
+
SEQ_PUT_FIELD_RET(s, entry->pid);
- SEQ_PUT_FIELD_RET(s, entry->cpu);
- SEQ_PUT_FIELD_RET(s, entry->t);
+ SEQ_PUT_FIELD_RET(s, iter->cpu);
+ SEQ_PUT_FIELD_RET(s, iter->ts);
switch (entry->type) {
- case TRACE_FN:
- SEQ_PUT_FIELD_RET(s, entry->fn.ip);
- SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip);
+ case TRACE_FN: {
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, field->ip);
+ SEQ_PUT_FIELD_RET(s, field->parent_ip);
break;
- case TRACE_CTX:
- SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid);
- SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio);
- SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state);
- SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid);
- SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio);
- SEQ_PUT_FIELD_RET(s, entry->ctx.next_state);
+ }
+ case TRACE_CTX: {
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, field->prev_pid);
+ SEQ_PUT_FIELD_RET(s, field->prev_prio);
+ SEQ_PUT_FIELD_RET(s, field->prev_state);
+ SEQ_PUT_FIELD_RET(s, field->next_pid);
+ SEQ_PUT_FIELD_RET(s, field->next_prio);
+ SEQ_PUT_FIELD_RET(s, field->next_state);
break;
+ }
case TRACE_SPECIAL:
- case TRACE_STACK:
- SEQ_PUT_FIELD_RET(s, entry->special.arg1);
- SEQ_PUT_FIELD_RET(s, entry->special.arg2);
- SEQ_PUT_FIELD_RET(s, entry->special.arg3);
+ case TRACE_STACK: {
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, field->arg1);
+ SEQ_PUT_FIELD_RET(s, field->arg2);
+ SEQ_PUT_FIELD_RET(s, field->arg3);
break;
}
+ }
return 1;
}
static int trace_empty(struct trace_iterator *iter)
{
- struct trace_array_cpu *data;
int cpu;
for_each_tracing_cpu(cpu) {
- data = iter->tr->data[cpu];
-
- if (head_page(data) && data->trace_idx &&
- (data->trace_tail != data->trace_head ||
- data->trace_tail_idx != data->trace_head_idx))
- return 0;
+ if (iter->buffer_iter[cpu]) {
+ if (!ring_buffer_iter_empty(iter->buffer_iter[cpu]))
+ return 0;
+ } else {
+ if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu))
+ return 0;
+ }
}
+
return 1;
}
-static int print_trace_line(struct trace_iterator *iter)
+static enum print_line_t print_trace_line(struct trace_iterator *iter)
{
- if (iter->trace && iter->trace->print_line)
- return iter->trace->print_line(iter);
+ enum print_line_t ret;
+
+ if (iter->trace && iter->trace->print_line) {
+ ret = iter->trace->print_line(iter);
+ if (ret != TRACE_TYPE_UNHANDLED)
+ return ret;
+ }
if (trace_flags & TRACE_ITER_BIN)
return print_bin_fmt(iter);
@@ -1869,6 +1869,8 @@ static struct trace_iterator *
__tracing_open(struct inode *inode, struct file *file, int *ret)
{
struct trace_iterator *iter;
+ struct seq_file *m;
+ int cpu;
if (tracing_disabled) {
*ret = -ENODEV;
@@ -1889,28 +1891,45 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
iter->trace = current_trace;
iter->pos = -1;
+ for_each_tracing_cpu(cpu) {
+
+ iter->buffer_iter[cpu] =
+ ring_buffer_read_start(iter->tr->buffer, cpu);
+
+ if (!iter->buffer_iter[cpu])
+ goto fail_buffer;
+ }
+
/* TODO stop tracer */
*ret = seq_open(file, &tracer_seq_ops);
- if (!*ret) {
- struct seq_file *m = file->private_data;
- m->private = iter;
+ if (*ret)
+ goto fail_buffer;
- /* stop the trace while dumping */
- if (iter->tr->ctrl) {
- tracer_enabled = 0;
- ftrace_function_enabled = 0;
- }
+ m = file->private_data;
+ m->private = iter;
- if (iter->trace && iter->trace->open)
- iter->trace->open(iter);
- } else {
- kfree(iter);
- iter = NULL;
+ /* stop the trace while dumping */
+ if (iter->tr->ctrl) {
+ tracer_enabled = 0;
+ ftrace_function_enabled = 0;
}
+
+ if (iter->trace && iter->trace->open)
+ iter->trace->open(iter);
+
mutex_unlock(&trace_types_lock);
out:
return iter;
+
+ fail_buffer:
+ for_each_tracing_cpu(cpu) {
+ if (iter->buffer_iter[cpu])
+ ring_buffer_read_finish(iter->buffer_iter[cpu]);
+ }
+ mutex_unlock(&trace_types_lock);
+
+ return ERR_PTR(-ENOMEM);
}
int tracing_open_generic(struct inode *inode, struct file *filp)
@@ -1926,8 +1945,14 @@ int tracing_release(struct inode *inode, struct file *file)
{
struct seq_file *m = (struct seq_file *)file->private_data;
struct trace_iterator *iter = m->private;
+ int cpu;
mutex_lock(&trace_types_lock);
+ for_each_tracing_cpu(cpu) {
+ if (iter->buffer_iter[cpu])
+ ring_buffer_read_finish(iter->buffer_iter[cpu]);
+ }
+
if (iter->trace && iter->trace->close)
iter->trace->close(iter);
@@ -2352,9 +2377,11 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
struct tracer *t;
char buf[max_tracer_type_len+1];
int i;
+ size_t ret;
if (cnt > max_tracer_type_len)
cnt = max_tracer_type_len;
+ ret = cnt;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
@@ -2370,7 +2397,11 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
if (strcmp(t->name, buf) == 0)
break;
}
- if (!t || t == current_trace)
+ if (!t) {
+ ret = -EINVAL;
+ goto out;
+ }
+ if (t == current_trace)
goto out;
if (current_trace && current_trace->reset)
@@ -2383,9 +2414,10 @@ tracing_set_trace_write(struct file *filp, const char __user *ubuf,
out:
mutex_unlock(&trace_types_lock);
- filp->f_pos += cnt;
+ if (ret == cnt)
+ filp->f_pos += cnt;
- return cnt;
+ return ret;
}
static ssize_t
@@ -2500,20 +2532,12 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct trace_iterator *iter = filp->private_data;
- struct trace_array_cpu *data;
- static cpumask_t mask;
- unsigned long flags;
-#ifdef CONFIG_FTRACE
- int ftrace_save;
-#endif
- int cpu;
ssize_t sret;
/* return any leftover data */
sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
if (sret != -EBUSY)
return sret;
- sret = 0;
trace_seq_reset(&iter->seq);
@@ -2524,6 +2548,8 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
goto out;
}
+waitagain:
+ sret = 0;
while (trace_empty(iter)) {
if ((filp->f_flags & O_NONBLOCK)) {
@@ -2588,46 +2614,12 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
offsetof(struct trace_iterator, seq));
iter->pos = -1;
- /*
- * We need to stop all tracing on all CPUS to read the
- * the next buffer. This is a bit expensive, but is
- * not done often. We fill all what we can read,
- * and then release the locks again.
- */
-
- cpus_clear(mask);
- local_irq_save(flags);
-#ifdef CONFIG_FTRACE
- ftrace_save = ftrace_enabled;
- ftrace_enabled = 0;
-#endif
- smp_wmb();
- for_each_tracing_cpu(cpu) {
- data = iter->tr->data[cpu];
-
- if (!head_page(data) || !data->trace_idx)
- continue;
-
- atomic_inc(&data->disabled);
- cpu_set(cpu, mask);
- }
-
- for_each_cpu_mask(cpu, mask) {
- data = iter->tr->data[cpu];
- __raw_spin_lock(&data->lock);
-
- if (data->overrun > iter->last_overrun[cpu])
- iter->overrun[cpu] +=
- data->overrun - iter->last_overrun[cpu];
- iter->last_overrun[cpu] = data->overrun;
- }
-
while (find_next_entry_inc(iter) != NULL) {
- int ret;
+ enum print_line_t ret;
int len = iter->seq.len;
ret = print_trace_line(iter);
- if (!ret) {
+ if (ret == TRACE_TYPE_PARTIAL_LINE) {
/* don't print partial lines */
iter->seq.len = len;
break;
@@ -2639,26 +2631,17 @@ tracing_read_pipe(struct file *filp, char __user *ubuf,
break;
}
- for_each_cpu_mask(cpu, mask) {
- data = iter->tr->data[cpu];
- __raw_spin_unlock(&data->lock);
- }
-
- for_each_cpu_mask(cpu, mask) {
- data = iter->tr->data[cpu];
- atomic_dec(&data->disabled);
- }
-#ifdef CONFIG_FTRACE
- ftrace_enabled = ftrace_save;
-#endif
- local_irq_restore(flags);
-
/* Now copy what we have to the user */
sret = trace_seq_to_user(&iter->seq, ubuf, cnt);
if (iter->seq.readpos >= iter->seq.len)
trace_seq_reset(&iter->seq);
+
+ /*
+ * If there was nothing to send to user, inspite of consuming trace
+ * entries, go back to wait for more entries.
+ */
if (sret == -EBUSY)
- sret = 0;
+ goto waitagain;
out:
mutex_unlock(&trace_types_lock);
@@ -2684,7 +2667,8 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
{
unsigned long val;
char buf[64];
- int i, ret;
+ int ret;
+ struct trace_array *tr = filp->private_data;
if (cnt >= sizeof(buf))
return -EINVAL;
@@ -2704,59 +2688,38 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
mutex_lock(&trace_types_lock);
- if (current_trace != &no_tracer) {
+ if (tr->ctrl) {
cnt = -EBUSY;
- pr_info("ftrace: set current_tracer to none"
+ pr_info("ftrace: please disable tracing"
" before modifying buffer size\n");
goto out;
}
- if (val > global_trace.entries) {
- long pages_requested;
- unsigned long freeable_pages;
-
- /* make sure we have enough memory before mapping */
- pages_requested =
- (val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE;
-
- /* account for each buffer (and max_tr) */
- pages_requested *= tracing_nr_buffers * 2;
-
- /* Check for overflow */
- if (pages_requested < 0) {
- cnt = -ENOMEM;
- goto out;
- }
-
- freeable_pages = determine_dirtyable_memory();
-
- /* we only allow to request 1/4 of useable memory */
- if (pages_requested >
- ((freeable_pages + tracing_pages_allocated) / 4)) {
- cnt = -ENOMEM;
+ if (val != global_trace.entries) {
+ ret = ring_buffer_resize(global_trace.buffer, val);
+ if (ret < 0) {
+ cnt = ret;
goto out;
}
- while (global_trace.entries < val) {
- if (trace_alloc_page()) {
- cnt = -ENOMEM;
- goto out;
+ ret = ring_buffer_resize(max_tr.buffer, val);
+ if (ret < 0) {
+ int r;
+ cnt = ret;
+ r = ring_buffer_resize(global_trace.buffer,
+ global_trace.entries);
+ if (r < 0) {
+ /* AARGH! We are left with different
+ * size max buffer!!!! */
+ WARN_ON(1);
+ tracing_disabled = 1;
}
- /* double check that we don't go over the known pages */
- if (tracing_pages_allocated > pages_requested)
- break;
+ goto out;
}
- } else {
- /* include the number of entries in val (inc of page entries) */
- while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1))
- trace_free_page();
+ global_trace.entries = val;
}
- /* check integrity */
- for_each_tracing_cpu(i)
- check_pages(global_trace.data[i]);
-
filp->f_pos += cnt;
/* If check pages failed, return ENOMEM */
@@ -2769,6 +2732,52 @@ tracing_entries_write(struct file *filp, const char __user *ubuf,
return cnt;
}
+static int mark_printk(const char *fmt, ...)
+{
+ int ret;
+ va_list args;
+ va_start(args, fmt);
+ ret = trace_vprintk(0, fmt, args);
+ va_end(args);
+ return ret;
+}
+
+static ssize_t
+tracing_mark_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *fpos)
+{
+ char *buf;
+ char *end;
+ struct trace_array *tr = &global_trace;
+
+ if (!tr->ctrl || tracing_disabled)
+ return -EINVAL;
+
+ if (cnt > TRACE_BUF_SIZE)
+ cnt = TRACE_BUF_SIZE;
+
+ buf = kmalloc(cnt + 1, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(buf, ubuf, cnt)) {
+ kfree(buf);
+ return -EFAULT;
+ }
+
+ /* Cut from the first nil or newline. */
+ buf[cnt] = '\0';
+ end = strchr(buf, '\n');
+ if (end)
+ *end = '\0';
+
+ cnt = mark_printk("%s\n", buf);
+ kfree(buf);
+ *fpos += cnt;
+
+ return cnt;
+}
+
static struct file_operations tracing_max_lat_fops = {
.open = tracing_open_generic,
.read = tracing_max_lat_read,
@@ -2800,6 +2809,11 @@ static struct file_operations tracing_entries_fops = {
.write = tracing_entries_write,
};
+static struct file_operations tracing_mark_fops = {
+ .open = tracing_open_generic,
+ .write = tracing_mark_write,
+};
+
#ifdef CONFIG_DYNAMIC_FTRACE
static ssize_t
@@ -2846,7 +2860,7 @@ struct dentry *tracing_init_dentry(void)
#include "trace_selftest.c"
#endif
-static __init void tracer_init_debugfs(void)
+static __init int tracer_init_debugfs(void)
{
struct dentry *d_tracer;
struct dentry *entry;
@@ -2881,12 +2895,12 @@ static __init void tracer_init_debugfs(void)
entry = debugfs_create_file("available_tracers", 0444, d_tracer,
&global_trace, &show_traces_fops);
if (!entry)
- pr_warning("Could not create debugfs 'trace' entry\n");
+ pr_warning("Could not create debugfs 'available_tracers' entry\n");
entry = debugfs_create_file("current_tracer", 0444, d_tracer,
&global_trace, &set_tracer_fops);
if (!entry)
- pr_warning("Could not create debugfs 'trace' entry\n");
+ pr_warning("Could not create debugfs 'current_tracer' entry\n");
entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer,
&tracing_max_latency,
@@ -2899,7 +2913,7 @@ static __init void tracer_init_debugfs(void)
&tracing_thresh, &tracing_max_lat_fops);
if (!entry)
pr_warning("Could not create debugfs "
- "'tracing_threash' entry\n");
+ "'tracing_thresh' entry\n");
entry = debugfs_create_file("README", 0644, d_tracer,
NULL, &tracing_readme_fops);
if (!entry)
@@ -2909,13 +2923,19 @@ static __init void tracer_init_debugfs(void)
NULL, &tracing_pipe_fops);
if (!entry)
pr_warning("Could not create debugfs "
- "'tracing_threash' entry\n");
+ "'trace_pipe' entry\n");
entry = debugfs_create_file("trace_entries", 0644, d_tracer,
&global_trace, &tracing_entries_fops);
if (!entry)
pr_warning("Could not create debugfs "
- "'tracing_threash' entry\n");
+ "'trace_entries' entry\n");
+
+ entry = debugfs_create_file("trace_marker", 0220, d_tracer,
+ NULL, &tracing_mark_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs "
+ "'trace_marker' entry\n");
#ifdef CONFIG_DYNAMIC_FTRACE
entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
@@ -2928,230 +2948,263 @@ static __init void tracer_init_debugfs(void)
#ifdef CONFIG_SYSPROF_TRACER
init_tracer_sysprof_debugfs(d_tracer);
#endif
+ return 0;
}
-static int trace_alloc_page(void)
+int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
{
+ static DEFINE_SPINLOCK(trace_buf_lock);
+ static char trace_buf[TRACE_BUF_SIZE];
+
+ struct ring_buffer_event *event;
+ struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
- struct page *page, *tmp;
- LIST_HEAD(pages);
- void *array;
- unsigned pages_allocated = 0;
- int i;
+ struct print_entry *entry;
+ unsigned long flags, irq_flags;
+ int cpu, len = 0, size, pc;
- /* first allocate a page for each CPU */
- for_each_tracing_cpu(i) {
- array = (void *)__get_free_page(GFP_KERNEL);
- if (array == NULL) {
- printk(KERN_ERR "tracer: failed to allocate page"
- "for trace buffer!\n");
- goto free_pages;
- }
+ if (!tr->ctrl || tracing_disabled)
+ return 0;
- pages_allocated++;
- page = virt_to_page(array);
- list_add(&page->lru, &pages);
+ pc = preempt_count();
+ preempt_disable_notrace();
+ cpu = raw_smp_processor_id();
+ data = tr->data[cpu];
-/* Only allocate if we are actually using the max trace */
-#ifdef CONFIG_TRACER_MAX_TRACE
- array = (void *)__get_free_page(GFP_KERNEL);
- if (array == NULL) {
- printk(KERN_ERR "tracer: failed to allocate page"
- "for trace buffer!\n");
- goto free_pages;
- }
- pages_allocated++;
- page = virt_to_page(array);
- list_add(&page->lru, &pages);
-#endif
- }
+ if (unlikely(atomic_read(&data->disabled)))
+ goto out;
- /* Now that we successfully allocate a page per CPU, add them */
- for_each_tracing_cpu(i) {
- data = global_trace.data[i];
- page = list_entry(pages.next, struct page, lru);
- list_del_init(&page->lru);
- list_add_tail(&page->lru, &data->trace_pages);
- ClearPageLRU(page);
+ spin_lock_irqsave(&trace_buf_lock, flags);
+ len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args);
-#ifdef CONFIG_TRACER_MAX_TRACE
- data = max_tr.data[i];
- page = list_entry(pages.next, struct page, lru);
- list_del_init(&page->lru);
- list_add_tail(&page->lru, &data->trace_pages);
- SetPageLRU(page);
-#endif
- }
- tracing_pages_allocated += pages_allocated;
- global_trace.entries += ENTRIES_PER_PAGE;
+ len = min(len, TRACE_BUF_SIZE-1);
+ trace_buf[len] = 0;
- return 0;
+ size = sizeof(*entry) + len + 1;
+ event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags);
+ if (!event)
+ goto out_unlock;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, flags, pc);
+ entry->ent.type = TRACE_PRINT;
+ entry->ip = ip;
- free_pages:
- list_for_each_entry_safe(page, tmp, &pages, lru) {
- list_del_init(&page->lru);
- __free_page(page);
- }
- return -ENOMEM;
+ memcpy(&entry->buf, trace_buf, len);
+ entry->buf[len] = 0;
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ out_unlock:
+ spin_unlock_irqrestore(&trace_buf_lock, flags);
+
+ out:
+ preempt_enable_notrace();
+
+ return len;
}
+EXPORT_SYMBOL_GPL(trace_vprintk);
-static int trace_free_page(void)
+int __ftrace_printk(unsigned long ip, const char *fmt, ...)
{
- struct trace_array_cpu *data;
- struct page *page;
- struct list_head *p;
- int i;
- int ret = 0;
+ int ret;
+ va_list ap;
- /* free one page from each buffer */
- for_each_tracing_cpu(i) {
- data = global_trace.data[i];
- p = data->trace_pages.next;
- if (p == &data->trace_pages) {
- /* should never happen */
- WARN_ON(1);
- tracing_disabled = 1;
- ret = -1;
- break;
- }
- page = list_entry(p, struct page, lru);
- ClearPageLRU(page);
- list_del(&page->lru);
- tracing_pages_allocated--;
- tracing_pages_allocated--;
- __free_page(page);
+ if (!(trace_flags & TRACE_ITER_PRINTK))
+ return 0;
- tracing_reset(data);
+ va_start(ap, fmt);
+ ret = trace_vprintk(ip, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__ftrace_printk);
-#ifdef CONFIG_TRACER_MAX_TRACE
- data = max_tr.data[i];
- p = data->trace_pages.next;
- if (p == &data->trace_pages) {
- /* should never happen */
- WARN_ON(1);
- tracing_disabled = 1;
- ret = -1;
- break;
- }
- page = list_entry(p, struct page, lru);
- ClearPageLRU(page);
- list_del(&page->lru);
- __free_page(page);
+static int trace_panic_handler(struct notifier_block *this,
+ unsigned long event, void *unused)
+{
+ ftrace_dump();
+ return NOTIFY_OK;
+}
- tracing_reset(data);
-#endif
- }
- global_trace.entries -= ENTRIES_PER_PAGE;
+static struct notifier_block trace_panic_notifier = {
+ .notifier_call = trace_panic_handler,
+ .next = NULL,
+ .priority = 150 /* priority: INT_MAX >= x >= 0 */
+};
- return ret;
+static int trace_die_handler(struct notifier_block *self,
+ unsigned long val,
+ void *data)
+{
+ switch (val) {
+ case DIE_OOPS:
+ ftrace_dump();
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
}
-__init static int tracer_alloc_buffers(void)
+static struct notifier_block trace_die_notifier = {
+ .notifier_call = trace_die_handler,
+ .priority = 200
+};
+
+/*
+ * printk is set to max of 1024, we really don't need it that big.
+ * Nothing should be printing 1000 characters anyway.
+ */
+#define TRACE_MAX_PRINT 1000
+
+/*
+ * Define here KERN_TRACE so that we have one place to modify
+ * it if we decide to change what log level the ftrace dump
+ * should be at.
+ */
+#define KERN_TRACE KERN_INFO
+
+static void
+trace_printk_seq(struct trace_seq *s)
{
- struct trace_array_cpu *data;
- void *array;
- struct page *page;
- int pages = 0;
- int ret = -ENOMEM;
- int i;
+ /* Probably should print a warning here. */
+ if (s->len >= 1000)
+ s->len = 1000;
- /* TODO: make the number of buffers hot pluggable with CPUS */
- tracing_nr_buffers = num_possible_cpus();
- tracing_buffer_mask = cpu_possible_map;
+ /* should be zero ended, but we are paranoid. */
+ s->buffer[s->len] = 0;
- /* Allocate the first page for all buffers */
- for_each_tracing_cpu(i) {
- data = global_trace.data[i] = &per_cpu(global_trace_cpu, i);
- max_tr.data[i] = &per_cpu(max_data, i);
+ printk(KERN_TRACE "%s", s->buffer);
- array = (void *)__get_free_page(GFP_KERNEL);
- if (array == NULL) {
- printk(KERN_ERR "tracer: failed to allocate page"
- "for trace buffer!\n");
- goto free_buffers;
- }
+ trace_seq_reset(s);
+}
+
+
+void ftrace_dump(void)
+{
+ static DEFINE_SPINLOCK(ftrace_dump_lock);
+ /* use static because iter can be a bit big for the stack */
+ static struct trace_iterator iter;
+ static cpumask_t mask;
+ static int dump_ran;
+ unsigned long flags;
+ int cnt = 0, cpu;
- /* set the array to the list */
- INIT_LIST_HEAD(&data->trace_pages);
- page = virt_to_page(array);
- list_add(&page->lru, &data->trace_pages);
- /* use the LRU flag to differentiate the two buffers */
- ClearPageLRU(page);
+ /* only one dump */
+ spin_lock_irqsave(&ftrace_dump_lock, flags);
+ if (dump_ran)
+ goto out;
- data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
- max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+ dump_ran = 1;
-/* Only allocate if we are actually using the max trace */
-#ifdef CONFIG_TRACER_MAX_TRACE
- array = (void *)__get_free_page(GFP_KERNEL);
- if (array == NULL) {
- printk(KERN_ERR "tracer: failed to allocate page"
- "for trace buffer!\n");
- goto free_buffers;
- }
+ /* No turning back! */
+ ftrace_kill_atomic();
- INIT_LIST_HEAD(&max_tr.data[i]->trace_pages);
- page = virt_to_page(array);
- list_add(&page->lru, &max_tr.data[i]->trace_pages);
- SetPageLRU(page);
-#endif
+ for_each_tracing_cpu(cpu) {
+ atomic_inc(&global_trace.data[cpu]->disabled);
}
+ printk(KERN_TRACE "Dumping ftrace buffer:\n");
+
+ iter.tr = &global_trace;
+ iter.trace = current_trace;
+
/*
- * Since we allocate by orders of pages, we may be able to
- * round up a bit.
+ * We need to stop all tracing on all CPUS to read the
+ * the next buffer. This is a bit expensive, but is
+ * not done often. We fill all what we can read,
+ * and then release the locks again.
*/
- global_trace.entries = ENTRIES_PER_PAGE;
- pages++;
- while (global_trace.entries < trace_nr_entries) {
- if (trace_alloc_page())
- break;
- pages++;
+ cpus_clear(mask);
+
+ while (!trace_empty(&iter)) {
+
+ if (!cnt)
+ printk(KERN_TRACE "---------------------------------\n");
+
+ cnt++;
+
+ /* reset all but tr, trace, and overruns */
+ memset(&iter.seq, 0,
+ sizeof(struct trace_iterator) -
+ offsetof(struct trace_iterator, seq));
+ iter.iter_flags |= TRACE_FILE_LAT_FMT;
+ iter.pos = -1;
+
+ if (find_next_entry_inc(&iter) != NULL) {
+ print_trace_line(&iter);
+ trace_consume(&iter);
+ }
+
+ trace_printk_seq(&iter.seq);
}
- max_tr.entries = global_trace.entries;
- pr_info("tracer: %d pages allocated for %ld entries of %ld bytes\n",
- pages, trace_nr_entries, (long)TRACE_ENTRY_SIZE);
- pr_info(" actual entries %ld\n", global_trace.entries);
+ if (!cnt)
+ printk(KERN_TRACE " (ftrace buffer empty)\n");
+ else
+ printk(KERN_TRACE "---------------------------------\n");
+
+ out:
+ spin_unlock_irqrestore(&ftrace_dump_lock, flags);
+}
+
+__init static int tracer_alloc_buffers(void)
+{
+ struct trace_array_cpu *data;
+ int i;
+
+ /* TODO: make the number of buffers hot pluggable with CPUS */
+ tracing_buffer_mask = cpu_possible_map;
+
+ global_trace.buffer = ring_buffer_alloc(trace_buf_size,
+ TRACE_BUFFER_FLAGS);
+ if (!global_trace.buffer) {
+ printk(KERN_ERR "tracer: failed to allocate ring buffer!\n");
+ WARN_ON(1);
+ return 0;
+ }
+ global_trace.entries = ring_buffer_size(global_trace.buffer);
- tracer_init_debugfs();
+#ifdef CONFIG_TRACER_MAX_TRACE
+ max_tr.buffer = ring_buffer_alloc(trace_buf_size,
+ TRACE_BUFFER_FLAGS);
+ if (!max_tr.buffer) {
+ printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
+ WARN_ON(1);
+ ring_buffer_free(global_trace.buffer);
+ return 0;
+ }
+ max_tr.entries = ring_buffer_size(max_tr.buffer);
+ WARN_ON(max_tr.entries != global_trace.entries);
+#endif
+
+ /* Allocate the first page for all buffers */
+ for_each_tracing_cpu(i) {
+ data = global_trace.data[i] = &per_cpu(global_trace_cpu, i);
+ max_tr.data[i] = &per_cpu(max_data, i);
+ }
trace_init_cmdlines();
- register_tracer(&no_tracer);
- current_trace = &no_tracer;
+ register_tracer(&nop_trace);
+#ifdef CONFIG_BOOT_TRACER
+ register_tracer(&boot_tracer);
+ current_trace = &boot_tracer;
+ current_trace->init(&global_trace);
+#else
+ current_trace = &nop_trace;
+#endif
/* All seems OK, enable tracing */
global_trace.ctrl = tracer_enabled;
tracing_disabled = 0;
- return 0;
+ atomic_notifier_chain_register(&panic_notifier_list,
+ &trace_panic_notifier);
- free_buffers:
- for (i-- ; i >= 0; i--) {
- struct page *page, *tmp;
- struct trace_array_cpu *data = global_trace.data[i];
+ register_die_notifier(&trace_die_notifier);
- if (data) {
- list_for_each_entry_safe(page, tmp,
- &data->trace_pages, lru) {
- list_del_init(&page->lru);
- __free_page(page);
- }
- }
-
-#ifdef CONFIG_TRACER_MAX_TRACE
- data = max_tr.data[i];
- if (data) {
- list_for_each_entry_safe(page, tmp,
- &data->trace_pages, lru) {
- list_del_init(&page->lru);
- __free_page(page);
- }
- }
-#endif
- }
- return ret;
+ return 0;
}
-fs_initcall(tracer_alloc_buffers);
+early_initcall(tracer_alloc_buffers);
+fs_initcall(tracer_init_debugfs);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index f69f86788c2..f1f99572cde 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -5,7 +5,9 @@
#include <asm/atomic.h>
#include <linux/sched.h>
#include <linux/clocksource.h>
+#include <linux/ring_buffer.h>
#include <linux/mmiotrace.h>
+#include <linux/ftrace.h>
enum trace_type {
__TRACE_FIRST_TYPE = 0,
@@ -13,38 +15,60 @@ enum trace_type {
TRACE_FN,
TRACE_CTX,
TRACE_WAKE,
+ TRACE_CONT,
TRACE_STACK,
+ TRACE_PRINT,
TRACE_SPECIAL,
TRACE_MMIO_RW,
TRACE_MMIO_MAP,
+ TRACE_BOOT,
__TRACE_LAST_TYPE
};
/*
+ * The trace entry - the most basic unit of tracing. This is what
+ * is printed in the end as a single line in the trace output, such as:
+ *
+ * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
+ */
+struct trace_entry {
+ unsigned char type;
+ unsigned char cpu;
+ unsigned char flags;
+ unsigned char preempt_count;
+ int pid;
+};
+
+/*
* Function trace entry - function address and parent function addres:
*/
struct ftrace_entry {
+ struct trace_entry ent;
unsigned long ip;
unsigned long parent_ip;
};
+extern struct tracer boot_tracer;
/*
* Context switch trace entry - which task (and prio) we switched from/to:
*/
struct ctx_switch_entry {
+ struct trace_entry ent;
unsigned int prev_pid;
unsigned char prev_prio;
unsigned char prev_state;
unsigned int next_pid;
unsigned char next_prio;
unsigned char next_state;
+ unsigned int next_cpu;
};
/*
* Special (free-form) trace entry:
*/
struct special_entry {
+ struct trace_entry ent;
unsigned long arg1;
unsigned long arg2;
unsigned long arg3;
@@ -57,33 +81,60 @@ struct special_entry {
#define FTRACE_STACK_ENTRIES 8
struct stack_entry {
+ struct trace_entry ent;
unsigned long caller[FTRACE_STACK_ENTRIES];
};
/*
- * The trace entry - the most basic unit of tracing. This is what
- * is printed in the end as a single line in the trace output, such as:
- *
- * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
+ * ftrace_printk entry:
*/
-struct trace_entry {
- char type;
- char cpu;
- char flags;
- char preempt_count;
- int pid;
- cycle_t t;
- union {
- struct ftrace_entry fn;
- struct ctx_switch_entry ctx;
- struct special_entry special;
- struct stack_entry stack;
- struct mmiotrace_rw mmiorw;
- struct mmiotrace_map mmiomap;
- };
+struct print_entry {
+ struct trace_entry ent;
+ unsigned long ip;
+ char buf[];
+};
+
+#define TRACE_OLD_SIZE 88
+
+struct trace_field_cont {
+ unsigned char type;
+ /* Temporary till we get rid of this completely */
+ char buf[TRACE_OLD_SIZE - 1];
+};
+
+struct trace_mmiotrace_rw {
+ struct trace_entry ent;
+ struct mmiotrace_rw rw;
};
-#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
+struct trace_mmiotrace_map {
+ struct trace_entry ent;
+ struct mmiotrace_map map;
+};
+
+struct trace_boot {
+ struct trace_entry ent;
+ struct boot_trace initcall;
+};
+
+/*
+ * trace_flag_type is an enumeration that holds different
+ * states when a trace occurs. These are:
+ * IRQS_OFF - interrupts were disabled
+ * NEED_RESCED - reschedule is requested
+ * HARDIRQ - inside an interrupt handler
+ * SOFTIRQ - inside a softirq handler
+ * CONT - multiple entries hold the trace item
+ */
+enum trace_flag_type {
+ TRACE_FLAG_IRQS_OFF = 0x01,
+ TRACE_FLAG_NEED_RESCHED = 0x02,
+ TRACE_FLAG_HARDIRQ = 0x04,
+ TRACE_FLAG_SOFTIRQ = 0x08,
+ TRACE_FLAG_CONT = 0x10,
+};
+
+#define TRACE_BUF_SIZE 1024
/*
* The CPU trace array - it consists of thousands of trace entries
@@ -91,16 +142,9 @@ struct trace_entry {
* the trace, etc.)
*/
struct trace_array_cpu {
- struct list_head trace_pages;
atomic_t disabled;
- raw_spinlock_t lock;
- struct lock_class_key lock_key;
/* these fields get copied into max-trace: */
- unsigned trace_head_idx;
- unsigned trace_tail_idx;
- void *trace_head; /* producer */
- void *trace_tail; /* consumer */
unsigned long trace_idx;
unsigned long overrun;
unsigned long saved_latency;
@@ -124,6 +168,7 @@ struct trace_iterator;
* They have on/off state as well:
*/
struct trace_array {
+ struct ring_buffer *buffer;
unsigned long entries;
long ctrl;
int cpu;
@@ -132,6 +177,56 @@ struct trace_array {
struct trace_array_cpu *data[NR_CPUS];
};
+#define FTRACE_CMP_TYPE(var, type) \
+ __builtin_types_compatible_p(typeof(var), type *)
+
+#undef IF_ASSIGN
+#define IF_ASSIGN(var, entry, etype, id) \
+ if (FTRACE_CMP_TYPE(var, etype)) { \
+ var = (typeof(var))(entry); \
+ WARN_ON(id && (entry)->type != id); \
+ break; \
+ }
+
+/* Will cause compile errors if type is not found. */
+extern void __ftrace_bad_type(void);
+
+/*
+ * The trace_assign_type is a verifier that the entry type is
+ * the same as the type being assigned. To add new types simply
+ * add a line with the following format:
+ *
+ * IF_ASSIGN(var, ent, type, id);
+ *
+ * Where "type" is the trace type that includes the trace_entry
+ * as the "ent" item. And "id" is the trace identifier that is
+ * used in the trace_type enum.
+ *
+ * If the type can have more than one id, then use zero.
+ */
+#define trace_assign_type(var, ent) \
+ do { \
+ IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
+ IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
+ IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
+ IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
+ IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
+ IF_ASSIGN(var, ent, struct special_entry, 0); \
+ IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
+ TRACE_MMIO_RW); \
+ IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
+ TRACE_MMIO_MAP); \
+ IF_ASSIGN(var, ent, struct trace_boot, TRACE_BOOT); \
+ __ftrace_bad_type(); \
+ } while (0)
+
+/* Return values for print_line callback */
+enum print_line_t {
+ TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
+ TRACE_TYPE_HANDLED = 1,
+ TRACE_TYPE_UNHANDLED = 2 /* Relay to other output functions */
+};
+
/*
* A specific tracer, represented by methods that operate on a trace array:
*/
@@ -152,7 +247,7 @@ struct tracer {
int (*selftest)(struct tracer *trace,
struct trace_array *tr);
#endif
- int (*print_line)(struct trace_iterator *iter);
+ enum print_line_t (*print_line)(struct trace_iterator *iter);
struct tracer *next;
int print_max;
};
@@ -171,57 +266,58 @@ struct trace_iterator {
struct trace_array *tr;
struct tracer *trace;
void *private;
- long last_overrun[NR_CPUS];
- long overrun[NR_CPUS];
+ struct ring_buffer_iter *buffer_iter[NR_CPUS];
/* The below is zeroed out in pipe_read */
struct trace_seq seq;
struct trace_entry *ent;
int cpu;
-
- struct trace_entry *prev_ent;
- int prev_cpu;
+ u64 ts;
unsigned long iter_flags;
loff_t pos;
- unsigned long next_idx[NR_CPUS];
- struct list_head *next_page[NR_CPUS];
- unsigned next_page_idx[NR_CPUS];
long idx;
};
-void tracing_reset(struct trace_array_cpu *data);
+void trace_wake_up(void);
+void tracing_reset(struct trace_array *tr, int cpu);
int tracing_open_generic(struct inode *inode, struct file *filp);
struct dentry *tracing_init_dentry(void);
void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
+struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
+ struct trace_array_cpu *data);
+void tracing_generic_entry_update(struct trace_entry *entry,
+ unsigned long flags,
+ int pc);
+
void ftrace(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long ip,
unsigned long parent_ip,
- unsigned long flags);
+ unsigned long flags, int pc);
void tracing_sched_switch_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *prev,
struct task_struct *next,
- unsigned long flags);
+ unsigned long flags, int pc);
void tracing_record_cmdline(struct task_struct *tsk);
void tracing_sched_wakeup_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *wakee,
struct task_struct *cur,
- unsigned long flags);
+ unsigned long flags, int pc);
void trace_special(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long arg1,
unsigned long arg2,
- unsigned long arg3);
+ unsigned long arg3, int pc);
void trace_function(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long ip,
unsigned long parent_ip,
- unsigned long flags);
+ unsigned long flags, int pc);
void tracing_start_cmdline_record(void);
void tracing_stop_cmdline_record(void);
@@ -268,51 +364,33 @@ extern unsigned long ftrace_update_tot_cnt;
extern int DYN_FTRACE_TEST_NAME(void);
#endif
-#ifdef CONFIG_MMIOTRACE
-extern void __trace_mmiotrace_rw(struct trace_array *tr,
- struct trace_array_cpu *data,
- struct mmiotrace_rw *rw);
-extern void __trace_mmiotrace_map(struct trace_array *tr,
- struct trace_array_cpu *data,
- struct mmiotrace_map *map);
-#endif
-
#ifdef CONFIG_FTRACE_STARTUP_TEST
-#ifdef CONFIG_FTRACE
extern int trace_selftest_startup_function(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_IRQSOFF_TRACER
extern int trace_selftest_startup_irqsoff(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_PREEMPT_TRACER
extern int trace_selftest_startup_preemptoff(struct tracer *trace,
struct trace_array *tr);
-#endif
-#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_SCHED_TRACER
extern int trace_selftest_startup_wakeup(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_CONTEXT_SWITCH_TRACER
+extern int trace_selftest_startup_nop(struct tracer *trace,
+ struct trace_array *tr);
extern int trace_selftest_startup_sched_switch(struct tracer *trace,
struct trace_array *tr);
-#endif
-#ifdef CONFIG_SYSPROF_TRACER
extern int trace_selftest_startup_sysprof(struct tracer *trace,
struct trace_array *tr);
-#endif
#endif /* CONFIG_FTRACE_STARTUP_TEST */
extern void *head_page(struct trace_array_cpu *data);
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
+extern void trace_seq_print_cont(struct trace_seq *s,
+ struct trace_iterator *iter);
extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
size_t cnt);
extern long ns2usecs(cycle_t nsec);
+extern int trace_vprintk(unsigned long ip, const char *fmt, va_list args);
extern unsigned long trace_flags;
@@ -334,6 +412,9 @@ enum trace_iterator_flags {
TRACE_ITER_BLOCK = 0x80,
TRACE_ITER_STACKTRACE = 0x100,
TRACE_ITER_SCHED_TREE = 0x200,
+ TRACE_ITER_PRINTK = 0x400,
};
+extern struct tracer nop_trace;
+
#endif /* _LINUX_KERNEL_TRACE_H */
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
new file mode 100644
index 00000000000..d0a5e50eeff
--- /dev/null
+++ b/kernel/trace/trace_boot.c
@@ -0,0 +1,126 @@
+/*
+ * ring buffer based initcalls tracer
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+
+#include "trace.h"
+
+static struct trace_array *boot_trace;
+static int trace_boot_enabled;
+
+
+/* Should be started after do_pre_smp_initcalls() in init/main.c */
+void start_boot_trace(void)
+{
+ trace_boot_enabled = 1;
+}
+
+void stop_boot_trace(void)
+{
+ trace_boot_enabled = 0;
+}
+
+void reset_boot_trace(struct trace_array *tr)
+{
+ stop_boot_trace();
+}
+
+static void boot_trace_init(struct trace_array *tr)
+{
+ int cpu;
+ boot_trace = tr;
+
+ trace_boot_enabled = 0;
+
+ for_each_cpu_mask(cpu, cpu_possible_map)
+ tracing_reset(tr, cpu);
+}
+
+static void boot_trace_ctrl_update(struct trace_array *tr)
+{
+ if (tr->ctrl)
+ start_boot_trace();
+ else
+ stop_boot_trace();
+}
+
+static enum print_line_t initcall_print_line(struct trace_iterator *iter)
+{
+ int ret;
+ struct trace_entry *entry = iter->ent;
+ struct trace_boot *field = (struct trace_boot *)entry;
+ struct boot_trace *it = &field->initcall;
+ struct trace_seq *s = &iter->seq;
+ struct timespec calltime = ktime_to_timespec(it->calltime);
+ struct timespec rettime = ktime_to_timespec(it->rettime);
+
+ if (entry->type == TRACE_BOOT) {
+ ret = trace_seq_printf(s, "[%5ld.%09ld] calling %s @ %i\n",
+ calltime.tv_sec,
+ calltime.tv_nsec,
+ it->func, it->caller);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
+ "returned %d after %lld msecs\n",
+ rettime.tv_sec,
+ rettime.tv_nsec,
+ it->func, it->result, it->duration);
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_HANDLED;
+ }
+ return TRACE_TYPE_UNHANDLED;
+}
+
+struct tracer boot_tracer __read_mostly =
+{
+ .name = "initcall",
+ .init = boot_trace_init,
+ .reset = reset_boot_trace,
+ .ctrl_update = boot_trace_ctrl_update,
+ .print_line = initcall_print_line,
+};
+
+void trace_boot(struct boot_trace *it, initcall_t fn)
+{
+ struct ring_buffer_event *event;
+ struct trace_boot *entry;
+ struct trace_array_cpu *data;
+ unsigned long irq_flags;
+ struct trace_array *tr = boot_trace;
+
+ if (!trace_boot_enabled)
+ return;
+
+ /* Get its name now since this function could
+ * disappear because it is in the .init section.
+ */
+ sprint_symbol(it->func, (unsigned long)fn);
+ preempt_disable();
+ data = tr->data[smp_processor_id()];
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ goto out;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, 0);
+ entry->ent.type = TRACE_BOOT;
+ entry->initcall = *it;
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ trace_wake_up();
+
+ out:
+ preempt_enable();
+}
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 31214489797..e90eb0c2c56 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -23,7 +23,7 @@ static void function_reset(struct trace_array *tr)
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
- tracing_reset(tr->data[cpu]);
+ tracing_reset(tr, cpu);
}
static void start_function_trace(struct trace_array *tr)
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index ece6cfb649f..a7db7f040ae 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -95,7 +95,7 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip)
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, data, ip, parent_ip, flags, preempt_count());
atomic_dec(&data->disabled);
}
@@ -130,6 +130,7 @@ check_critical_timing(struct trace_array *tr,
unsigned long latency, t0, t1;
cycle_t T0, T1, delta;
unsigned long flags;
+ int pc;
/*
* usecs conversion is slow so we try to delay the conversion
@@ -141,6 +142,8 @@ check_critical_timing(struct trace_array *tr,
local_save_flags(flags);
+ pc = preempt_count();
+
if (!report_latency(delta))
goto out;
@@ -150,7 +153,7 @@ check_critical_timing(struct trace_array *tr,
if (!report_latency(delta))
goto out_unlock;
- trace_function(tr, data, CALLER_ADDR0, parent_ip, flags);
+ trace_function(tr, data, CALLER_ADDR0, parent_ip, flags, pc);
latency = nsecs_to_usecs(delta);
@@ -173,8 +176,8 @@ out_unlock:
out:
data->critical_sequence = max_sequence;
data->preempt_timestamp = ftrace_now(cpu);
- tracing_reset(data);
- trace_function(tr, data, CALLER_ADDR0, parent_ip, flags);
+ tracing_reset(tr, cpu);
+ trace_function(tr, data, CALLER_ADDR0, parent_ip, flags, pc);
}
static inline void
@@ -203,11 +206,11 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
data->critical_sequence = max_sequence;
data->preempt_timestamp = ftrace_now(cpu);
data->critical_start = parent_ip ? : ip;
- tracing_reset(data);
+ tracing_reset(tr, cpu);
local_save_flags(flags);
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, data, ip, parent_ip, flags, preempt_count());
per_cpu(tracing_cpu, cpu) = 1;
@@ -234,14 +237,14 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
data = tr->data[cpu];
- if (unlikely(!data) || unlikely(!head_page(data)) ||
+ if (unlikely(!data) ||
!data->critical_start || atomic_read(&data->disabled))
return;
atomic_inc(&data->disabled);
local_save_flags(flags);
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, data, ip, parent_ip, flags, preempt_count());
check_critical_timing(tr, data, parent_ip ? : ip, cpu);
data->critical_start = 0;
atomic_dec(&data->disabled);
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index b13dc19dcbb..f28484618ff 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -27,7 +27,7 @@ static void mmio_reset_data(struct trace_array *tr)
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
- tracing_reset(tr->data[cpu]);
+ tracing_reset(tr, cpu);
}
static void mmio_trace_init(struct trace_array *tr)
@@ -130,10 +130,14 @@ static unsigned long count_overruns(struct trace_iterator *iter)
{
int cpu;
unsigned long cnt = 0;
+/* FIXME: */
+#if 0
for_each_online_cpu(cpu) {
cnt += iter->overrun[cpu];
iter->overrun[cpu] = 0;
}
+#endif
+ (void)cpu;
return cnt;
}
@@ -171,17 +175,21 @@ print_out:
return (ret == -EBUSY) ? 0 : ret;
}
-static int mmio_print_rw(struct trace_iterator *iter)
+static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
{
struct trace_entry *entry = iter->ent;
- struct mmiotrace_rw *rw = &entry->mmiorw;
+ struct trace_mmiotrace_rw *field;
+ struct mmiotrace_rw *rw;
struct trace_seq *s = &iter->seq;
- unsigned long long t = ns2usecs(entry->t);
+ unsigned long long t = ns2usecs(iter->ts);
unsigned long usec_rem = do_div(t, 1000000ULL);
unsigned secs = (unsigned long)t;
int ret = 1;
- switch (entry->mmiorw.opcode) {
+ trace_assign_type(field, entry);
+ rw = &field->rw;
+
+ switch (rw->opcode) {
case MMIO_READ:
ret = trace_seq_printf(s,
"R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
@@ -209,21 +217,25 @@ static int mmio_print_rw(struct trace_iterator *iter)
break;
}
if (ret)
- return 1;
- return 0;
+ return TRACE_TYPE_HANDLED;
+ return TRACE_TYPE_PARTIAL_LINE;
}
-static int mmio_print_map(struct trace_iterator *iter)
+static enum print_line_t mmio_print_map(struct trace_iterator *iter)
{
struct trace_entry *entry = iter->ent;
- struct mmiotrace_map *m = &entry->mmiomap;
+ struct trace_mmiotrace_map *field;
+ struct mmiotrace_map *m;
struct trace_seq *s = &iter->seq;
- unsigned long long t = ns2usecs(entry->t);
+ unsigned long long t = ns2usecs(iter->ts);
unsigned long usec_rem = do_div(t, 1000000ULL);
unsigned secs = (unsigned long)t;
- int ret = 1;
+ int ret;
- switch (entry->mmiorw.opcode) {
+ trace_assign_type(field, entry);
+ m = &field->map;
+
+ switch (m->opcode) {
case MMIO_PROBE:
ret = trace_seq_printf(s,
"MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
@@ -241,20 +253,43 @@ static int mmio_print_map(struct trace_iterator *iter)
break;
}
if (ret)
- return 1;
- return 0;
+ return TRACE_TYPE_HANDLED;
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
+{
+ struct trace_entry *entry = iter->ent;
+ struct print_entry *print = (struct print_entry *)entry;
+ const char *msg = print->buf;
+ struct trace_seq *s = &iter->seq;
+ unsigned long long t = ns2usecs(iter->ts);
+ unsigned long usec_rem = do_div(t, 1000000ULL);
+ unsigned secs = (unsigned long)t;
+ int ret;
+
+ /* The trailing newline must be in the message. */
+ ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ if (entry->flags & TRACE_FLAG_CONT)
+ trace_seq_print_cont(s, iter);
+
+ return TRACE_TYPE_HANDLED;
}
-/* return 0 to abort printing without consuming current entry in pipe mode */
-static int mmio_print_line(struct trace_iterator *iter)
+static enum print_line_t mmio_print_line(struct trace_iterator *iter)
{
switch (iter->ent->type) {
case TRACE_MMIO_RW:
return mmio_print_rw(iter);
case TRACE_MMIO_MAP:
return mmio_print_map(iter);
+ case TRACE_PRINT:
+ return mmio_print_mark(iter);
default:
- return 1; /* ignore unknown entries */
+ return TRACE_TYPE_HANDLED; /* ignore unknown entries */
}
}
@@ -276,6 +311,27 @@ __init static int init_mmio_trace(void)
}
device_initcall(init_mmio_trace);
+static void __trace_mmiotrace_rw(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ struct mmiotrace_rw *rw)
+{
+ struct ring_buffer_event *event;
+ struct trace_mmiotrace_rw *entry;
+ unsigned long irq_flags;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, preempt_count());
+ entry->ent.type = TRACE_MMIO_RW;
+ entry->rw = *rw;
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ trace_wake_up();
+}
+
void mmio_trace_rw(struct mmiotrace_rw *rw)
{
struct trace_array *tr = mmio_trace_array;
@@ -283,6 +339,27 @@ void mmio_trace_rw(struct mmiotrace_rw *rw)
__trace_mmiotrace_rw(tr, data, rw);
}
+static void __trace_mmiotrace_map(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ struct mmiotrace_map *map)
+{
+ struct ring_buffer_event *event;
+ struct trace_mmiotrace_map *entry;
+ unsigned long irq_flags;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, preempt_count());
+ entry->ent.type = TRACE_MMIO_MAP;
+ entry->map = *map;
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ trace_wake_up();
+}
+
void mmio_trace_mapping(struct mmiotrace_map *map)
{
struct trace_array *tr = mmio_trace_array;
@@ -293,3 +370,8 @@ void mmio_trace_mapping(struct mmiotrace_map *map)
__trace_mmiotrace_map(tr, data, map);
preempt_enable();
}
+
+int mmio_trace_printk(const char *fmt, va_list args)
+{
+ return trace_vprintk(0, fmt, args);
+}
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
new file mode 100644
index 00000000000..4592b486251
--- /dev/null
+++ b/kernel/trace/trace_nop.c
@@ -0,0 +1,64 @@
+/*
+ * nop tracer
+ *
+ * Copyright (C) 2008 Steven Noonan <steven@uplinklabs.net>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+
+#include "trace.h"
+
+static struct trace_array *ctx_trace;
+
+static void start_nop_trace(struct trace_array *tr)
+{
+ /* Nothing to do! */
+}
+
+static void stop_nop_trace(struct trace_array *tr)
+{
+ /* Nothing to do! */
+}
+
+static void nop_trace_init(struct trace_array *tr)
+{
+ int cpu;
+ ctx_trace = tr;
+
+ for_each_online_cpu(cpu)
+ tracing_reset(tr, cpu);
+
+ if (tr->ctrl)
+ start_nop_trace(tr);
+}
+
+static void nop_trace_reset(struct trace_array *tr)
+{
+ if (tr->ctrl)
+ stop_nop_trace(tr);
+}
+
+static void nop_trace_ctrl_update(struct trace_array *tr)
+{
+ /* When starting a new trace, reset the buffers */
+ if (tr->ctrl)
+ start_nop_trace(tr);
+ else
+ stop_nop_trace(tr);
+}
+
+struct tracer nop_trace __read_mostly =
+{
+ .name = "nop",
+ .init = nop_trace_init,
+ .reset = nop_trace_reset,
+ .ctrl_update = nop_trace_ctrl_update,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_nop,
+#endif
+};
+
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index cb817a209aa..b8f56beb1a6 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -9,8 +9,8 @@
#include <linux/debugfs.h>
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
-#include <linux/marker.h>
#include <linux/ftrace.h>
+#include <trace/sched.h>
#include "trace.h"
@@ -19,15 +19,16 @@ static int __read_mostly tracer_enabled;
static atomic_t sched_ref;
static void
-sched_switch_func(void *private, void *__rq, struct task_struct *prev,
+probe_sched_switch(struct rq *__rq, struct task_struct *prev,
struct task_struct *next)
{
- struct trace_array **ptr = private;
- struct trace_array *tr = *ptr;
struct trace_array_cpu *data;
unsigned long flags;
- long disabled;
int cpu;
+ int pc;
+
+ if (!atomic_read(&sched_ref))
+ return;
tracing_record_cmdline(prev);
tracing_record_cmdline(next);
@@ -35,97 +36,41 @@ sched_switch_func(void *private, void *__rq, struct task_struct *prev,
if (!tracer_enabled)
return;
+ pc = preempt_count();
local_irq_save(flags);
cpu = raw_smp_processor_id();
- data = tr->data[cpu];
- disabled = atomic_inc_return(&data->disabled);
+ data = ctx_trace->data[cpu];
- if (likely(disabled == 1))
- tracing_sched_switch_trace(tr, data, prev, next, flags);
+ if (likely(!atomic_read(&data->disabled)))
+ tracing_sched_switch_trace(ctx_trace, data, prev, next, flags, pc);
- atomic_dec(&data->disabled);
local_irq_restore(flags);
}
-static notrace void
-sched_switch_callback(void *probe_data, void *call_data,
- const char *format, va_list *args)
-{
- struct task_struct *prev;
- struct task_struct *next;
- struct rq *__rq;
-
- if (!atomic_read(&sched_ref))
- return;
-
- /* skip prev_pid %d next_pid %d prev_state %ld */
- (void)va_arg(*args, int);
- (void)va_arg(*args, int);
- (void)va_arg(*args, long);
- __rq = va_arg(*args, typeof(__rq));
- prev = va_arg(*args, typeof(prev));
- next = va_arg(*args, typeof(next));
-
- /*
- * If tracer_switch_func only points to the local
- * switch func, it still needs the ptr passed to it.
- */
- sched_switch_func(probe_data, __rq, prev, next);
-}
-
static void
-wakeup_func(void *private, void *__rq, struct task_struct *wakee, struct
- task_struct *curr)
+probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee)
{
- struct trace_array **ptr = private;
- struct trace_array *tr = *ptr;
struct trace_array_cpu *data;
unsigned long flags;
- long disabled;
- int cpu;
+ int cpu, pc;
- if (!tracer_enabled)
+ if (!likely(tracer_enabled))
return;
- tracing_record_cmdline(curr);
+ pc = preempt_count();
+ tracing_record_cmdline(current);
local_irq_save(flags);
cpu = raw_smp_processor_id();
- data = tr->data[cpu];
- disabled = atomic_inc_return(&data->disabled);
+ data = ctx_trace->data[cpu];
- if (likely(disabled == 1))
- tracing_sched_wakeup_trace(tr, data, wakee, curr, flags);
+ if (likely(!atomic_read(&data->disabled)))
+ tracing_sched_wakeup_trace(ctx_trace, data, wakee, current,
+ flags, pc);
- atomic_dec(&data->disabled);
local_irq_restore(flags);
}
-static notrace void
-wake_up_callback(void *probe_data, void *call_data,
- const char *format, va_list *args)
-{
- struct task_struct *curr;
- struct task_struct *task;
- struct rq *__rq;
-
- if (likely(!tracer_enabled))
- return;
-
- /* Skip pid %d state %ld */
- (void)va_arg(*args, int);
- (void)va_arg(*args, long);
- /* now get the meat: "rq %p task %p rq->curr %p" */
- __rq = va_arg(*args, typeof(__rq));
- task = va_arg(*args, typeof(task));
- curr = va_arg(*args, typeof(curr));
-
- tracing_record_cmdline(task);
- tracing_record_cmdline(curr);
-
- wakeup_func(probe_data, __rq, task, curr);
-}
-
static void sched_switch_reset(struct trace_array *tr)
{
int cpu;
@@ -133,67 +78,47 @@ static void sched_switch_reset(struct trace_array *tr)
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
- tracing_reset(tr->data[cpu]);
+ tracing_reset(tr, cpu);
}
static int tracing_sched_register(void)
{
int ret;
- ret = marker_probe_register("kernel_sched_wakeup",
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- wake_up_callback,
- &ctx_trace);
+ ret = register_trace_sched_wakeup(probe_sched_wakeup);
if (ret) {
- pr_info("wakeup trace: Couldn't add marker"
+ pr_info("wakeup trace: Couldn't activate tracepoint"
" probe to kernel_sched_wakeup\n");
return ret;
}
- ret = marker_probe_register("kernel_sched_wakeup_new",
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- wake_up_callback,
- &ctx_trace);
+ ret = register_trace_sched_wakeup_new(probe_sched_wakeup);
if (ret) {
- pr_info("wakeup trace: Couldn't add marker"
+ pr_info("wakeup trace: Couldn't activate tracepoint"
" probe to kernel_sched_wakeup_new\n");
goto fail_deprobe;
}
- ret = marker_probe_register("kernel_sched_schedule",
- "prev_pid %d next_pid %d prev_state %ld "
- "## rq %p prev %p next %p",
- sched_switch_callback,
- &ctx_trace);
+ ret = register_trace_sched_switch(probe_sched_switch);
if (ret) {
- pr_info("sched trace: Couldn't add marker"
+ pr_info("sched trace: Couldn't activate tracepoint"
" probe to kernel_sched_schedule\n");
goto fail_deprobe_wake_new;
}
return ret;
fail_deprobe_wake_new:
- marker_probe_unregister("kernel_sched_wakeup_new",
- wake_up_callback,
- &ctx_trace);
+ unregister_trace_sched_wakeup_new(probe_sched_wakeup);
fail_deprobe:
- marker_probe_unregister("kernel_sched_wakeup",
- wake_up_callback,
- &ctx_trace);
+ unregister_trace_sched_wakeup(probe_sched_wakeup);
return ret;
}
static void tracing_sched_unregister(void)
{
- marker_probe_unregister("kernel_sched_schedule",
- sched_switch_callback,
- &ctx_trace);
- marker_probe_unregister("kernel_sched_wakeup_new",
- wake_up_callback,
- &ctx_trace);
- marker_probe_unregister("kernel_sched_wakeup",
- wake_up_callback,
- &ctx_trace);
+ unregister_trace_sched_switch(probe_sched_switch);
+ unregister_trace_sched_wakeup_new(probe_sched_wakeup);
+ unregister_trace_sched_wakeup(probe_sched_wakeup);
}
static void tracing_start_sched_switch(void)
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index e303ccb62cd..fe4a252c236 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -15,7 +15,7 @@
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <linux/ftrace.h>
-#include <linux/marker.h>
+#include <trace/sched.h>
#include "trace.h"
@@ -44,10 +44,12 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
long disabled;
int resched;
int cpu;
+ int pc;
if (likely(!wakeup_task))
return;
+ pc = preempt_count();
resched = need_resched();
preempt_disable_notrace();
@@ -70,7 +72,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
if (task_cpu(wakeup_task) != cpu)
goto unlock;
- trace_function(tr, data, ip, parent_ip, flags);
+ trace_function(tr, data, ip, parent_ip, flags, pc);
unlock:
__raw_spin_unlock(&wakeup_lock);
@@ -112,17 +114,18 @@ static int report_latency(cycle_t delta)
}
static void notrace
-wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
+probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
struct task_struct *next)
{
unsigned long latency = 0, t0 = 0, t1 = 0;
- struct trace_array **ptr = private;
- struct trace_array *tr = *ptr;
struct trace_array_cpu *data;
cycle_t T0, T1, delta;
unsigned long flags;
long disabled;
int cpu;
+ int pc;
+
+ tracing_record_cmdline(prev);
if (unlikely(!tracer_enabled))
return;
@@ -139,12 +142,14 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
if (next != wakeup_task)
return;
+ pc = preempt_count();
+
/* The task we are waiting for is waking up */
- data = tr->data[wakeup_cpu];
+ data = wakeup_trace->data[wakeup_cpu];
/* disable local data, not wakeup_cpu data */
cpu = raw_smp_processor_id();
- disabled = atomic_inc_return(&tr->data[cpu]->disabled);
+ disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
if (likely(disabled != 1))
goto out;
@@ -155,7 +160,7 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
if (unlikely(!tracer_enabled || next != wakeup_task))
goto out_unlock;
- trace_function(tr, data, CALLER_ADDR1, CALLER_ADDR2, flags);
+ trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
/*
* usecs conversion is slow so we try to delay the conversion
@@ -174,39 +179,14 @@ wakeup_sched_switch(void *private, void *rq, struct task_struct *prev,
t0 = nsecs_to_usecs(T0);
t1 = nsecs_to_usecs(T1);
- update_max_tr(tr, wakeup_task, wakeup_cpu);
+ update_max_tr(wakeup_trace, wakeup_task, wakeup_cpu);
out_unlock:
- __wakeup_reset(tr);
+ __wakeup_reset(wakeup_trace);
__raw_spin_unlock(&wakeup_lock);
local_irq_restore(flags);
out:
- atomic_dec(&tr->data[cpu]->disabled);
-}
-
-static notrace void
-sched_switch_callback(void *probe_data, void *call_data,
- const char *format, va_list *args)
-{
- struct task_struct *prev;
- struct task_struct *next;
- struct rq *__rq;
-
- /* skip prev_pid %d next_pid %d prev_state %ld */
- (void)va_arg(*args, int);
- (void)va_arg(*args, int);
- (void)va_arg(*args, long);
- __rq = va_arg(*args, typeof(__rq));
- prev = va_arg(*args, typeof(prev));
- next = va_arg(*args, typeof(next));
-
- tracing_record_cmdline(prev);
-
- /*
- * If tracer_switch_func only points to the local
- * switch func, it still needs the ptr passed to it.
- */
- wakeup_sched_switch(probe_data, __rq, prev, next);
+ atomic_dec(&wakeup_trace->data[cpu]->disabled);
}
static void __wakeup_reset(struct trace_array *tr)
@@ -216,7 +196,7 @@ static void __wakeup_reset(struct trace_array *tr)
for_each_possible_cpu(cpu) {
data = tr->data[cpu];
- tracing_reset(data);
+ tracing_reset(tr, cpu);
}
wakeup_cpu = -1;
@@ -240,19 +220,26 @@ static void wakeup_reset(struct trace_array *tr)
}
static void
-wakeup_check_start(struct trace_array *tr, struct task_struct *p,
- struct task_struct *curr)
+probe_wakeup(struct rq *rq, struct task_struct *p)
{
int cpu = smp_processor_id();
unsigned long flags;
long disabled;
+ int pc;
+
+ if (likely(!tracer_enabled))
+ return;
+
+ tracing_record_cmdline(p);
+ tracing_record_cmdline(current);
if (likely(!rt_task(p)) ||
p->prio >= wakeup_prio ||
- p->prio >= curr->prio)
+ p->prio >= current->prio)
return;
- disabled = atomic_inc_return(&tr->data[cpu]->disabled);
+ pc = preempt_count();
+ disabled = atomic_inc_return(&wakeup_trace->data[cpu]->disabled);
if (unlikely(disabled != 1))
goto out;
@@ -264,7 +251,7 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
goto out_locked;
/* reset the trace */
- __wakeup_reset(tr);
+ __wakeup_reset(wakeup_trace);
wakeup_cpu = task_cpu(p);
wakeup_prio = p->prio;
@@ -274,74 +261,37 @@ wakeup_check_start(struct trace_array *tr, struct task_struct *p,
local_save_flags(flags);
- tr->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu);
- trace_function(tr, tr->data[wakeup_cpu],
- CALLER_ADDR1, CALLER_ADDR2, flags);
+ wakeup_trace->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu);
+ trace_function(wakeup_trace, wakeup_trace->data[wakeup_cpu],
+ CALLER_ADDR1, CALLER_ADDR2, flags, pc);
out_locked:
__raw_spin_unlock(&wakeup_lock);
out:
- atomic_dec(&tr->data[cpu]->disabled);
-}
-
-static notrace void
-wake_up_callback(void *probe_data, void *call_data,
- const char *format, va_list *args)
-{
- struct trace_array **ptr = probe_data;
- struct trace_array *tr = *ptr;
- struct task_struct *curr;
- struct task_struct *task;
- struct rq *__rq;
-
- if (likely(!tracer_enabled))
- return;
-
- /* Skip pid %d state %ld */
- (void)va_arg(*args, int);
- (void)va_arg(*args, long);
- /* now get the meat: "rq %p task %p rq->curr %p" */
- __rq = va_arg(*args, typeof(__rq));
- task = va_arg(*args, typeof(task));
- curr = va_arg(*args, typeof(curr));
-
- tracing_record_cmdline(task);
- tracing_record_cmdline(curr);
-
- wakeup_check_start(tr, task, curr);
+ atomic_dec(&wakeup_trace->data[cpu]->disabled);
}
static void start_wakeup_tracer(struct trace_array *tr)
{
int ret;
- ret = marker_probe_register("kernel_sched_wakeup",
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- wake_up_callback,
- &wakeup_trace);
+ ret = register_trace_sched_wakeup(probe_wakeup);
if (ret) {
- pr_info("wakeup trace: Couldn't add marker"
+ pr_info("wakeup trace: Couldn't activate tracepoint"
" probe to kernel_sched_wakeup\n");
return;
}
- ret = marker_probe_register("kernel_sched_wakeup_new",
- "pid %d state %ld ## rq %p task %p rq->curr %p",
- wake_up_callback,
- &wakeup_trace);
+ ret = register_trace_sched_wakeup_new(probe_wakeup);
if (ret) {
- pr_info("wakeup trace: Couldn't add marker"
+ pr_info("wakeup trace: Couldn't activate tracepoint"
" probe to kernel_sched_wakeup_new\n");
goto fail_deprobe;
}
- ret = marker_probe_register("kernel_sched_schedule",
- "prev_pid %d next_pid %d prev_state %ld "
- "## rq %p prev %p next %p",
- sched_switch_callback,
- &wakeup_trace);
+ ret = register_trace_sched_switch(probe_wakeup_sched_switch);
if (ret) {
- pr_info("sched trace: Couldn't add marker"
+ pr_info("sched trace: Couldn't activate tracepoint"
" probe to kernel_sched_schedule\n");
goto fail_deprobe_wake_new;
}
@@ -363,28 +313,18 @@ static void start_wakeup_tracer(struct trace_array *tr)
return;
fail_deprobe_wake_new:
- marker_probe_unregister("kernel_sched_wakeup_new",
- wake_up_callback,
- &wakeup_trace);
+ unregister_trace_sched_wakeup_new(probe_wakeup);
fail_deprobe:
- marker_probe_unregister("kernel_sched_wakeup",
- wake_up_callback,
- &wakeup_trace);
+ unregister_trace_sched_wakeup(probe_wakeup);
}
static void stop_wakeup_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
unregister_ftrace_function(&trace_ops);
- marker_probe_unregister("kernel_sched_schedule",
- sched_switch_callback,
- &wakeup_trace);
- marker_probe_unregister("kernel_sched_wakeup_new",
- wake_up_callback,
- &wakeup_trace);
- marker_probe_unregister("kernel_sched_wakeup",
- wake_up_callback,
- &wakeup_trace);
+ unregister_trace_sched_switch(probe_wakeup_sched_switch);
+ unregister_trace_sched_wakeup_new(probe_wakeup);
+ unregister_trace_sched_wakeup(probe_wakeup);
}
static void wakeup_tracer_init(struct trace_array *tr)
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 0911b7e073b..09cf230d7ec 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -9,65 +9,29 @@ static inline int trace_valid_entry(struct trace_entry *entry)
case TRACE_FN:
case TRACE_CTX:
case TRACE_WAKE:
+ case TRACE_CONT:
case TRACE_STACK:
+ case TRACE_PRINT:
case TRACE_SPECIAL:
return 1;
}
return 0;
}
-static int
-trace_test_buffer_cpu(struct trace_array *tr, struct trace_array_cpu *data)
+static int trace_test_buffer_cpu(struct trace_array *tr, int cpu)
{
- struct trace_entry *entries;
- struct page *page;
- int idx = 0;
- int i;
+ struct ring_buffer_event *event;
+ struct trace_entry *entry;
- BUG_ON(list_empty(&data->trace_pages));
- page = list_entry(data->trace_pages.next, struct page, lru);
- entries = page_address(page);
+ while ((event = ring_buffer_consume(tr->buffer, cpu, NULL))) {
+ entry = ring_buffer_event_data(event);
- check_pages(data);
- if (head_page(data) != entries)
- goto failed;
-
- /*
- * The starting trace buffer always has valid elements,
- * if any element exists.
- */
- entries = head_page(data);
-
- for (i = 0; i < tr->entries; i++) {
-
- if (i < data->trace_idx && !trace_valid_entry(&entries[idx])) {
+ if (!trace_valid_entry(entry)) {
printk(KERN_CONT ".. invalid entry %d ",
- entries[idx].type);
+ entry->type);
goto failed;
}
-
- idx++;
- if (idx >= ENTRIES_PER_PAGE) {
- page = virt_to_page(entries);
- if (page->lru.next == &data->trace_pages) {
- if (i != tr->entries - 1) {
- printk(KERN_CONT ".. entries buffer mismatch");
- goto failed;
- }
- } else {
- page = list_entry(page->lru.next, struct page, lru);
- entries = page_address(page);
- }
- idx = 0;
- }
}
-
- page = virt_to_page(entries);
- if (page->lru.next != &data->trace_pages) {
- printk(KERN_CONT ".. too many entries");
- goto failed;
- }
-
return 0;
failed:
@@ -89,13 +53,11 @@ static int trace_test_buffer(struct trace_array *tr, unsigned long *count)
/* Don't allow flipping of max traces now */
raw_local_irq_save(flags);
__raw_spin_lock(&ftrace_max_lock);
- for_each_possible_cpu(cpu) {
- if (!head_page(tr->data[cpu]))
- continue;
- cnt += tr->data[cpu]->trace_idx;
+ cnt = ring_buffer_entries(tr->buffer);
- ret = trace_test_buffer_cpu(tr, tr->data[cpu]);
+ for_each_possible_cpu(cpu) {
+ ret = trace_test_buffer_cpu(tr, cpu);
if (ret)
break;
}
@@ -120,11 +82,11 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
struct trace_array *tr,
int (*func)(void))
{
- unsigned long count;
- int ret;
int save_ftrace_enabled = ftrace_enabled;
int save_tracer_enabled = tracer_enabled;
+ unsigned long count;
char *func_name;
+ int ret;
/* The ftrace test PASSED */
printk(KERN_CONT "PASSED\n");
@@ -157,6 +119,7 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
/* enable tracing */
tr->ctrl = 1;
trace->init(tr);
+
/* Sleep for a 1/10 of a second */
msleep(100);
@@ -212,10 +175,10 @@ int trace_selftest_startup_dynamic_tracing(struct tracer *trace,
int
trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr)
{
- unsigned long count;
- int ret;
int save_ftrace_enabled = ftrace_enabled;
int save_tracer_enabled = tracer_enabled;
+ unsigned long count;
+ int ret;
/* make sure msleep has been recorded */
msleep(1);
@@ -415,6 +378,15 @@ trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *
}
#endif /* CONFIG_IRQSOFF_TRACER && CONFIG_PREEMPT_TRACER */
+#ifdef CONFIG_NOP_TRACER
+int
+trace_selftest_startup_nop(struct tracer *trace, struct trace_array *tr)
+{
+ /* What could possibly go wrong? */
+ return 0;
+}
+#endif
+
#ifdef CONFIG_SCHED_TRACER
static int trace_wakeup_test_thread(void *data)
{
@@ -486,6 +458,9 @@ trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr)
wake_up_process(p);
+ /* give a little time to let the thread wake up */
+ msleep(100);
+
/* stop the tracing. */
tr->ctrl = 0;
trace->ctrl_update(tr);
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
new file mode 100644
index 00000000000..74c5d9a3afa
--- /dev/null
+++ b/kernel/trace/trace_stack.c
@@ -0,0 +1,310 @@
+/*
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <linux/stacktrace.h>
+#include <linux/kallsyms.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include "trace.h"
+
+#define STACK_TRACE_ENTRIES 500
+
+static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES+1] =
+ { [0 ... (STACK_TRACE_ENTRIES)] = ULONG_MAX };
+static unsigned stack_dump_index[STACK_TRACE_ENTRIES];
+
+static struct stack_trace max_stack_trace = {
+ .max_entries = STACK_TRACE_ENTRIES,
+ .entries = stack_dump_trace,
+};
+
+static unsigned long max_stack_size;
+static raw_spinlock_t max_stack_lock =
+ (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
+
+static int stack_trace_disabled __read_mostly;
+static DEFINE_PER_CPU(int, trace_active);
+
+static inline void check_stack(void)
+{
+ unsigned long this_size, flags;
+ unsigned long *p, *top, *start;
+ int i;
+
+ this_size = ((unsigned long)&this_size) & (THREAD_SIZE-1);
+ this_size = THREAD_SIZE - this_size;
+
+ if (this_size <= max_stack_size)
+ return;
+
+ raw_local_irq_save(flags);
+ __raw_spin_lock(&max_stack_lock);
+
+ /* a race could have already updated it */
+ if (this_size <= max_stack_size)
+ goto out;
+
+ max_stack_size = this_size;
+
+ max_stack_trace.nr_entries = 0;
+ max_stack_trace.skip = 3;
+
+ save_stack_trace(&max_stack_trace);
+
+ /*
+ * Now find where in the stack these are.
+ */
+ i = 0;
+ start = &this_size;
+ top = (unsigned long *)
+ (((unsigned long)start & ~(THREAD_SIZE-1)) + THREAD_SIZE);
+
+ /*
+ * Loop through all the entries. One of the entries may
+ * for some reason be missed on the stack, so we may
+ * have to account for them. If they are all there, this
+ * loop will only happen once. This code only takes place
+ * on a new max, so it is far from a fast path.
+ */
+ while (i < max_stack_trace.nr_entries) {
+
+ stack_dump_index[i] = this_size;
+ p = start;
+
+ for (; p < top && i < max_stack_trace.nr_entries; p++) {
+ if (*p == stack_dump_trace[i]) {
+ this_size = stack_dump_index[i++] =
+ (top - p) * sizeof(unsigned long);
+ /* Start the search from here */
+ start = p + 1;
+ }
+ }
+
+ i++;
+ }
+
+ out:
+ __raw_spin_unlock(&max_stack_lock);
+ raw_local_irq_restore(flags);
+}
+
+static void
+stack_trace_call(unsigned long ip, unsigned long parent_ip)
+{
+ int cpu, resched;
+
+ if (unlikely(!ftrace_enabled || stack_trace_disabled))
+ return;
+
+ resched = need_resched();
+ preempt_disable_notrace();
+
+ cpu = raw_smp_processor_id();
+ /* no atomic needed, we only modify this variable by this cpu */
+ if (per_cpu(trace_active, cpu)++ != 0)
+ goto out;
+
+ check_stack();
+
+ out:
+ per_cpu(trace_active, cpu)--;
+ /* prevent recursion in schedule */
+ if (resched)
+ preempt_enable_no_resched_notrace();
+ else
+ preempt_enable_notrace();
+}
+
+static struct ftrace_ops trace_ops __read_mostly =
+{
+ .func = stack_trace_call,
+};
+
+static ssize_t
+stack_max_size_read(struct file *filp, char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long *ptr = filp->private_data;
+ char buf[64];
+ int r;
+
+ r = snprintf(buf, sizeof(buf), "%ld\n", *ptr);
+ if (r > sizeof(buf))
+ r = sizeof(buf);
+ return simple_read_from_buffer(ubuf, count, ppos, buf, r);
+}
+
+static ssize_t
+stack_max_size_write(struct file *filp, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ long *ptr = filp->private_data;
+ unsigned long val, flags;
+ char buf[64];
+ int ret;
+
+ if (count >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, count))
+ return -EFAULT;
+
+ buf[count] = 0;
+
+ ret = strict_strtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ raw_local_irq_save(flags);
+ __raw_spin_lock(&max_stack_lock);
+ *ptr = val;
+ __raw_spin_unlock(&max_stack_lock);
+ raw_local_irq_restore(flags);
+
+ return count;
+}
+
+static struct file_operations stack_max_size_fops = {
+ .open = tracing_open_generic,
+ .read = stack_max_size_read,
+ .write = stack_max_size_write,
+};
+
+static void *
+t_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ long i = (long)m->private;
+
+ (*pos)++;
+
+ i++;
+
+ if (i >= max_stack_trace.nr_entries ||
+ stack_dump_trace[i] == ULONG_MAX)
+ return NULL;
+
+ m->private = (void *)i;
+
+ return &m->private;
+}
+
+static void *t_start(struct seq_file *m, loff_t *pos)
+{
+ void *t = &m->private;
+ loff_t l = 0;
+
+ local_irq_disable();
+ __raw_spin_lock(&max_stack_lock);
+
+ for (; t && l < *pos; t = t_next(m, t, &l))
+ ;
+
+ return t;
+}
+
+static void t_stop(struct seq_file *m, void *p)
+{
+ __raw_spin_unlock(&max_stack_lock);
+ local_irq_enable();
+}
+
+static int trace_lookup_stack(struct seq_file *m, long i)
+{
+ unsigned long addr = stack_dump_trace[i];
+#ifdef CONFIG_KALLSYMS
+ char str[KSYM_SYMBOL_LEN];
+
+ sprint_symbol(str, addr);
+
+ return seq_printf(m, "%s\n", str);
+#else
+ return seq_printf(m, "%p\n", (void*)addr);
+#endif
+}
+
+static int t_show(struct seq_file *m, void *v)
+{
+ long i = *(long *)v;
+ int size;
+
+ if (i < 0) {
+ seq_printf(m, " Depth Size Location"
+ " (%d entries)\n"
+ " ----- ---- --------\n",
+ max_stack_trace.nr_entries);
+ return 0;
+ }
+
+ if (i >= max_stack_trace.nr_entries ||
+ stack_dump_trace[i] == ULONG_MAX)
+ return 0;
+
+ if (i+1 == max_stack_trace.nr_entries ||
+ stack_dump_trace[i+1] == ULONG_MAX)
+ size = stack_dump_index[i];
+ else
+ size = stack_dump_index[i] - stack_dump_index[i+1];
+
+ seq_printf(m, "%3ld) %8d %5d ", i, stack_dump_index[i], size);
+
+ trace_lookup_stack(m, i);
+
+ return 0;
+}
+
+static struct seq_operations stack_trace_seq_ops = {
+ .start = t_start,
+ .next = t_next,
+ .stop = t_stop,
+ .show = t_show,
+};
+
+static int stack_trace_open(struct inode *inode, struct file *file)
+{
+ int ret;
+
+ ret = seq_open(file, &stack_trace_seq_ops);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ m->private = (void *)-1;
+ }
+
+ return ret;
+}
+
+static struct file_operations stack_trace_fops = {
+ .open = stack_trace_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+};
+
+static __init int stack_trace_init(void)
+{
+ struct dentry *d_tracer;
+ struct dentry *entry;
+
+ d_tracer = tracing_init_dentry();
+
+ entry = debugfs_create_file("stack_max_size", 0644, d_tracer,
+ &max_stack_size, &stack_max_size_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs 'stack_max_size' entry\n");
+
+ entry = debugfs_create_file("stack_trace", 0444, d_tracer,
+ NULL, &stack_trace_fops);
+ if (!entry)
+ pr_warning("Could not create debugfs 'stack_trace' entry\n");
+
+ register_ftrace_function(&trace_ops);
+
+ return 0;
+}
+
+device_initcall(stack_trace_init);
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index db58fb66a13..9587d3bcba5 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -241,7 +241,7 @@ static void stack_reset(struct trace_array *tr)
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
- tracing_reset(tr->data[cpu]);
+ tracing_reset(tr, cpu);
}
static void start_stack_trace(struct trace_array *tr)
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
new file mode 100644
index 00000000000..f2b7c28a470
--- /dev/null
+++ b/kernel/tracepoint.c
@@ -0,0 +1,477 @@
+/*
+ * Copyright (C) 2008 Mathieu Desnoyers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/jhash.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <linux/tracepoint.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+extern struct tracepoint __start___tracepoints[];
+extern struct tracepoint __stop___tracepoints[];
+
+/* Set to 1 to enable tracepoint debug output */
+static const int tracepoint_debug;
+
+/*
+ * tracepoints_mutex nests inside module_mutex. Tracepoints mutex protects the
+ * builtin and module tracepoints and the hash table.
+ */
+static DEFINE_MUTEX(tracepoints_mutex);
+
+/*
+ * Tracepoint hash table, containing the active tracepoints.
+ * Protected by tracepoints_mutex.
+ */
+#define TRACEPOINT_HASH_BITS 6
+#define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS)
+
+/*
+ * Note about RCU :
+ * It is used to to delay the free of multiple probes array until a quiescent
+ * state is reached.
+ * Tracepoint entries modifications are protected by the tracepoints_mutex.
+ */
+struct tracepoint_entry {
+ struct hlist_node hlist;
+ void **funcs;
+ int refcount; /* Number of times armed. 0 if disarmed. */
+ struct rcu_head rcu;
+ void *oldptr;
+ unsigned char rcu_pending:1;
+ char name[0];
+};
+
+static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE];
+
+static void free_old_closure(struct rcu_head *head)
+{
+ struct tracepoint_entry *entry = container_of(head,
+ struct tracepoint_entry, rcu);
+ kfree(entry->oldptr);
+ /* Make sure we free the data before setting the pending flag to 0 */
+ smp_wmb();
+ entry->rcu_pending = 0;
+}
+
+static void tracepoint_entry_free_old(struct tracepoint_entry *entry, void *old)
+{
+ if (!old)
+ return;
+ entry->oldptr = old;
+ entry->rcu_pending = 1;
+ /* write rcu_pending before calling the RCU callback */
+ smp_wmb();
+ call_rcu_sched(&entry->rcu, free_old_closure);
+}
+
+static void debug_print_probes(struct tracepoint_entry *entry)
+{
+ int i;
+
+ if (!tracepoint_debug)
+ return;
+
+ for (i = 0; entry->funcs[i]; i++)
+ printk(KERN_DEBUG "Probe %d : %p\n", i, entry->funcs[i]);
+}
+
+static void *
+tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe)
+{
+ int nr_probes = 0;
+ void **old, **new;
+
+ WARN_ON(!probe);
+
+ debug_print_probes(entry);
+ old = entry->funcs;
+ if (old) {
+ /* (N -> N+1), (N != 0, 1) probes */
+ for (nr_probes = 0; old[nr_probes]; nr_probes++)
+ if (old[nr_probes] == probe)
+ return ERR_PTR(-EEXIST);
+ }
+ /* + 2 : one for new probe, one for NULL func */
+ new = kzalloc((nr_probes + 2) * sizeof(void *), GFP_KERNEL);
+ if (new == NULL)
+ return ERR_PTR(-ENOMEM);
+ if (old)
+ memcpy(new, old, nr_probes * sizeof(void *));
+ new[nr_probes] = probe;
+ entry->refcount = nr_probes + 1;
+ entry->funcs = new;
+ debug_print_probes(entry);
+ return old;
+}
+
+static void *
+tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe)
+{
+ int nr_probes = 0, nr_del = 0, i;
+ void **old, **new;
+
+ old = entry->funcs;
+
+ debug_print_probes(entry);
+ /* (N -> M), (N > 1, M >= 0) probes */
+ for (nr_probes = 0; old[nr_probes]; nr_probes++) {
+ if ((!probe || old[nr_probes] == probe))
+ nr_del++;
+ }
+
+ if (nr_probes - nr_del == 0) {
+ /* N -> 0, (N > 1) */
+ entry->funcs = NULL;
+ entry->refcount = 0;
+ debug_print_probes(entry);
+ return old;
+ } else {
+ int j = 0;
+ /* N -> M, (N > 1, M > 0) */
+ /* + 1 for NULL */
+ new = kzalloc((nr_probes - nr_del + 1)
+ * sizeof(void *), GFP_KERNEL);
+ if (new == NULL)
+ return ERR_PTR(-ENOMEM);
+ for (i = 0; old[i]; i++)
+ if ((probe && old[i] != probe))
+ new[j++] = old[i];
+ entry->refcount = nr_probes - nr_del;
+ entry->funcs = new;
+ }
+ debug_print_probes(entry);
+ return old;
+}
+
+/*
+ * Get tracepoint if the tracepoint is present in the tracepoint hash table.
+ * Must be called with tracepoints_mutex held.
+ * Returns NULL if not present.
+ */
+static struct tracepoint_entry *get_tracepoint(const char *name)
+{
+ struct hlist_head *head;
+ struct hlist_node *node;
+ struct tracepoint_entry *e;
+ u32 hash = jhash(name, strlen(name), 0);
+
+ head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
+ hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name))
+ return e;
+ }
+ return NULL;
+}
+
+/*
+ * Add the tracepoint to the tracepoint hash table. Must be called with
+ * tracepoints_mutex held.
+ */
+static struct tracepoint_entry *add_tracepoint(const char *name)
+{
+ struct hlist_head *head;
+ struct hlist_node *node;
+ struct tracepoint_entry *e;
+ size_t name_len = strlen(name) + 1;
+ u32 hash = jhash(name, name_len-1, 0);
+
+ head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
+ hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name)) {
+ printk(KERN_NOTICE
+ "tracepoint %s busy\n", name);
+ return ERR_PTR(-EEXIST); /* Already there */
+ }
+ }
+ /*
+ * Using kmalloc here to allocate a variable length element. Could
+ * cause some memory fragmentation if overused.
+ */
+ e = kmalloc(sizeof(struct tracepoint_entry) + name_len, GFP_KERNEL);
+ if (!e)
+ return ERR_PTR(-ENOMEM);
+ memcpy(&e->name[0], name, name_len);
+ e->funcs = NULL;
+ e->refcount = 0;
+ e->rcu_pending = 0;
+ hlist_add_head(&e->hlist, head);
+ return e;
+}
+
+/*
+ * Remove the tracepoint from the tracepoint hash table. Must be called with
+ * mutex_lock held.
+ */
+static int remove_tracepoint(const char *name)
+{
+ struct hlist_head *head;
+ struct hlist_node *node;
+ struct tracepoint_entry *e;
+ int found = 0;
+ size_t len = strlen(name) + 1;
+ u32 hash = jhash(name, len-1, 0);
+
+ head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)];
+ hlist_for_each_entry(e, node, head, hlist) {
+ if (!strcmp(name, e->name)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ return -ENOENT;
+ if (e->refcount)
+ return -EBUSY;
+ hlist_del(&e->hlist);
+ /* Make sure the call_rcu_sched has been executed */
+ if (e->rcu_pending)
+ rcu_barrier_sched();
+ kfree(e);
+ return 0;
+}
+
+/*
+ * Sets the probe callback corresponding to one tracepoint.
+ */
+static void set_tracepoint(struct tracepoint_entry **entry,
+ struct tracepoint *elem, int active)
+{
+ WARN_ON(strcmp((*entry)->name, elem->name) != 0);
+
+ /*
+ * rcu_assign_pointer has a smp_wmb() which makes sure that the new
+ * probe callbacks array is consistent before setting a pointer to it.
+ * This array is referenced by __DO_TRACE from
+ * include/linux/tracepoints.h. A matching smp_read_barrier_depends()
+ * is used.
+ */
+ rcu_assign_pointer(elem->funcs, (*entry)->funcs);
+ elem->state = active;
+}
+
+/*
+ * Disable a tracepoint and its probe callback.
+ * Note: only waiting an RCU period after setting elem->call to the empty
+ * function insures that the original callback is not used anymore. This insured
+ * by preempt_disable around the call site.
+ */
+static void disable_tracepoint(struct tracepoint *elem)
+{
+ elem->state = 0;
+}
+
+/**
+ * tracepoint_update_probe_range - Update a probe range
+ * @begin: beginning of the range
+ * @end: end of the range
+ *
+ * Updates the probe callback corresponding to a range of tracepoints.
+ */
+void tracepoint_update_probe_range(struct tracepoint *begin,
+ struct tracepoint *end)
+{
+ struct tracepoint *iter;
+ struct tracepoint_entry *mark_entry;
+
+ mutex_lock(&tracepoints_mutex);
+ for (iter = begin; iter < end; iter++) {
+ mark_entry = get_tracepoint(iter->name);
+ if (mark_entry) {
+ set_tracepoint(&mark_entry, iter,
+ !!mark_entry->refcount);
+ } else {
+ disable_tracepoint(iter);
+ }
+ }
+ mutex_unlock(&tracepoints_mutex);
+}
+
+/*
+ * Update probes, removing the faulty probes.
+ */
+static void tracepoint_update_probes(void)
+{
+ /* Core kernel tracepoints */
+ tracepoint_update_probe_range(__start___tracepoints,
+ __stop___tracepoints);
+ /* tracepoints in modules. */
+ module_update_tracepoints();
+}
+
+/**
+ * tracepoint_probe_register - Connect a probe to a tracepoint
+ * @name: tracepoint name
+ * @probe: probe handler
+ *
+ * Returns 0 if ok, error value on error.
+ * The probe address must at least be aligned on the architecture pointer size.
+ */
+int tracepoint_probe_register(const char *name, void *probe)
+{
+ struct tracepoint_entry *entry;
+ int ret = 0;
+ void *old;
+
+ mutex_lock(&tracepoints_mutex);
+ entry = get_tracepoint(name);
+ if (!entry) {
+ entry = add_tracepoint(name);
+ if (IS_ERR(entry)) {
+ ret = PTR_ERR(entry);
+ goto end;
+ }
+ }
+ /*
+ * If we detect that a call_rcu_sched is pending for this tracepoint,
+ * make sure it's executed now.
+ */
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
+ old = tracepoint_entry_add_probe(entry, probe);
+ if (IS_ERR(old)) {
+ ret = PTR_ERR(old);
+ goto end;
+ }
+ mutex_unlock(&tracepoints_mutex);
+ tracepoint_update_probes(); /* may update entry */
+ mutex_lock(&tracepoints_mutex);
+ entry = get_tracepoint(name);
+ WARN_ON(!entry);
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
+ tracepoint_entry_free_old(entry, old);
+end:
+ mutex_unlock(&tracepoints_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_register);
+
+/**
+ * tracepoint_probe_unregister - Disconnect a probe from a tracepoint
+ * @name: tracepoint name
+ * @probe: probe function pointer
+ *
+ * We do not need to call a synchronize_sched to make sure the probes have
+ * finished running before doing a module unload, because the module unload
+ * itself uses stop_machine(), which insures that every preempt disabled section
+ * have finished.
+ */
+int tracepoint_probe_unregister(const char *name, void *probe)
+{
+ struct tracepoint_entry *entry;
+ void *old;
+ int ret = -ENOENT;
+
+ mutex_lock(&tracepoints_mutex);
+ entry = get_tracepoint(name);
+ if (!entry)
+ goto end;
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
+ old = tracepoint_entry_remove_probe(entry, probe);
+ mutex_unlock(&tracepoints_mutex);
+ tracepoint_update_probes(); /* may update entry */
+ mutex_lock(&tracepoints_mutex);
+ entry = get_tracepoint(name);
+ if (!entry)
+ goto end;
+ if (entry->rcu_pending)
+ rcu_barrier_sched();
+ tracepoint_entry_free_old(entry, old);
+ remove_tracepoint(name); /* Ignore busy error message */
+ ret = 0;
+end:
+ mutex_unlock(&tracepoints_mutex);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
+
+/**
+ * tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
+ * @tracepoint: current tracepoints (in), next tracepoint (out)
+ * @begin: beginning of the range
+ * @end: end of the range
+ *
+ * Returns whether a next tracepoint has been found (1) or not (0).
+ * Will return the first tracepoint in the range if the input tracepoint is
+ * NULL.
+ */
+int tracepoint_get_iter_range(struct tracepoint **tracepoint,
+ struct tracepoint *begin, struct tracepoint *end)
+{
+ if (!*tracepoint && begin != end) {
+ *tracepoint = begin;
+ return 1;
+ }
+ if (*tracepoint >= begin && *tracepoint < end)
+ return 1;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_get_iter_range);
+
+static void tracepoint_get_iter(struct tracepoint_iter *iter)
+{
+ int found = 0;
+
+ /* Core kernel tracepoints */
+ if (!iter->module) {
+ found = tracepoint_get_iter_range(&iter->tracepoint,
+ __start___tracepoints, __stop___tracepoints);
+ if (found)
+ goto end;
+ }
+ /* tracepoints in modules. */
+ found = module_get_iter_tracepoints(iter);
+end:
+ if (!found)
+ tracepoint_iter_reset(iter);
+}
+
+void tracepoint_iter_start(struct tracepoint_iter *iter)
+{
+ tracepoint_get_iter(iter);
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_start);
+
+void tracepoint_iter_next(struct tracepoint_iter *iter)
+{
+ iter->tracepoint++;
+ /*
+ * iter->tracepoint may be invalid because we blindly incremented it.
+ * Make sure it is valid by marshalling on the tracepoints, getting the
+ * tracepoints from following modules if necessary.
+ */
+ tracepoint_get_iter(iter);
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_next);
+
+void tracepoint_iter_stop(struct tracepoint_iter *iter)
+{
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
+
+void tracepoint_iter_reset(struct tracepoint_iter *iter)
+{
+ iter->module = NULL;
+ iter->tracepoint = NULL;
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_reset);
diff --git a/kernel/user.c b/kernel/user.c
index 865ecf57a09..39d6159fae4 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -169,7 +169,7 @@ static ssize_t cpu_rt_runtime_show(struct kobject *kobj,
{
struct user_struct *up = container_of(kobj, struct user_struct, kobj);
- return sprintf(buf, "%lu\n", sched_group_rt_runtime(up->tg));
+ return sprintf(buf, "%ld\n", sched_group_rt_runtime(up->tg));
}
static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
@@ -180,7 +180,7 @@ static ssize_t cpu_rt_runtime_store(struct kobject *kobj,
unsigned long rt_runtime;
int rc;
- sscanf(buf, "%lu", &rt_runtime);
+ sscanf(buf, "%ld", &rt_runtime);
rc = sched_group_set_rt_runtime(up->tg, rt_runtime);
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c
index 4ab9659d269..3b34b354593 100644
--- a/kernel/utsname_sysctl.c
+++ b/kernel/utsname_sysctl.c
@@ -60,7 +60,7 @@ static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
#ifdef CONFIG_SYSCTL_SYSCALL
/* The generic string strategy routine: */
-static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+static int sysctl_uts_string(ctl_table *table,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen)
{
@@ -69,8 +69,7 @@ static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
write = newval && newlen;
memcpy(&uts_table, table, sizeof(uts_table));
uts_table.data = get_uts(table, write);
- r = sysctl_string(&uts_table, name, nlen,
- oldval, oldlenp, newval, newlen);
+ r = sysctl_string(&uts_table, oldval, oldlenp, newval, newlen);
put_uts(table, write, uts_table.data);
return r;
}
diff --git a/kernel/wait.c b/kernel/wait.c
index c275c56cf2d..cd87131f2fc 100644
--- a/kernel/wait.c
+++ b/kernel/wait.c
@@ -72,12 +72,7 @@ prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state)
spin_lock_irqsave(&q->lock, flags);
if (list_empty(&wait->task_list))
__add_wait_queue(q, wait);
- /*
- * don't alter the task state if this is just going to
- * queue an async wait queue callback
- */
- if (is_sync_wait(wait))
- set_current_state(state);
+ set_current_state(state);
spin_unlock_irqrestore(&q->lock, flags);
}
EXPORT_SYMBOL(prepare_to_wait);
@@ -91,12 +86,7 @@ prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state)
spin_lock_irqsave(&q->lock, flags);
if (list_empty(&wait->task_list))
__add_wait_queue_tail(q, wait);
- /*
- * don't alter the task state if this is just going to
- * queue an async wait queue callback
- */
- if (is_sync_wait(wait))
- set_current_state(state);
+ set_current_state(state);
spin_unlock_irqrestore(&q->lock, flags);
}
EXPORT_SYMBOL(prepare_to_wait_exclusive);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4048e92aa04..714afad4653 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -9,7 +9,7 @@
* Derived from the taskqueue/keventd code by:
*
* David Woodhouse <dwmw2@infradead.org>
- * Andrew Morton <andrewm@uow.edu.au>
+ * Andrew Morton
* Kai Petzke <wpp@marie.physik.tu-berlin.de>
* Theodore Ts'o <tytso@mit.edu>
*