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-rw-r--r--kernel/trace/Kconfig17
-rw-r--r--kernel/trace/Makefile2
-rw-r--r--kernel/trace/ftrace.c15
-rw-r--r--kernel/trace/ring_buffer.c103
-rw-r--r--kernel/trace/trace.c156
-rw-r--r--kernel/trace/trace.h20
-rw-r--r--kernel/trace/trace_boot.c14
-rw-r--r--kernel/trace/trace_bts.c276
-rw-r--r--kernel/trace/trace_functions.c14
-rw-r--r--kernel/trace/trace_functions_graph.c68
-rw-r--r--kernel/trace/trace_hw_branches.c195
-rw-r--r--kernel/trace/trace_mmiotrace.c6
-rw-r--r--kernel/trace/trace_power.c2
-rw-r--r--kernel/trace/trace_sched_switch.c17
-rw-r--r--kernel/trace/trace_sched_wakeup.c2
-rw-r--r--kernel/trace/trace_stack.c49
-rw-r--r--kernel/trace/trace_sysprof.c26
17 files changed, 533 insertions, 449 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index bde6f03512d..e2a4ff6fc3a 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -244,16 +244,21 @@ config STACK_TRACER
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.
+ stack-trace saved. If this is configured with DYNAMIC_FTRACE
+ then it will not have any overhead while the stack tracer
+ is disabled.
+
+ To enable the stack tracer on bootup, pass in 'stacktrace'
+ on the kernel command line.
+
+ The stack tracer can also be enabled or disabled via the
+ sysctl kernel.stack_tracer_enabled
Say N if unsure.
-config BTS_TRACER
+config HW_BRANCH_TRACER
depends on HAVE_HW_BRANCH_TRACER
- bool "Trace branches"
+ bool "Trace hw branches"
select TRACING
help
This tracer records all branches on the system in a circular
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 62dc561b667..349d5a93653 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -31,7 +31,7 @@ obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
-obj-$(CONFIG_BTS_TRACER) += trace_bts.o
+obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
obj-$(CONFIG_POWER_TRACER) += trace_power.o
libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index a12f80efcea..2f32969c09d 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1047,6 +1047,13 @@ ftrace_match(unsigned char *buff, int len, int enable)
int type = MATCH_FULL;
unsigned long flag = enable ? FTRACE_FL_FILTER : FTRACE_FL_NOTRACE;
unsigned i, match = 0, search_len = 0;
+ int not = 0;
+
+ if (buff[0] == '!') {
+ not = 1;
+ buff++;
+ len--;
+ }
for (i = 0; i < len; i++) {
if (buff[i] == '*') {
@@ -1100,8 +1107,12 @@ ftrace_match(unsigned char *buff, int len, int enable)
matched = 1;
break;
}
- if (matched)
- rec->flags |= flag;
+ if (matched) {
+ if (not)
+ rec->flags &= ~flag;
+ else
+ rec->flags |= flag;
+ }
}
pg = pg->next;
}
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 7f69cfeaadf..a9d9760dc7b 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -69,6 +69,7 @@ void tracing_on(void)
{
set_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
}
+EXPORT_SYMBOL_GPL(tracing_on);
/**
* tracing_off - turn off all tracing buffers
@@ -82,6 +83,7 @@ void tracing_off(void)
{
clear_bit(RB_BUFFERS_ON_BIT, &ring_buffer_flags);
}
+EXPORT_SYMBOL_GPL(tracing_off);
/**
* tracing_off_permanent - permanently disable ring buffers
@@ -107,16 +109,18 @@ u64 ring_buffer_time_stamp(int cpu)
preempt_disable_notrace();
/* shift to debug/test normalization and TIME_EXTENTS */
time = sched_clock() << DEBUG_SHIFT;
- preempt_enable_notrace();
+ preempt_enable_no_resched_notrace();
return time;
}
+EXPORT_SYMBOL_GPL(ring_buffer_time_stamp);
void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
{
/* Just stupid testing the normalize function and deltas */
*ts >>= DEBUG_SHIFT;
}
+EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
#define RB_ALIGNMENT_SHIFT 2
@@ -166,6 +170,7 @@ unsigned ring_buffer_event_length(struct ring_buffer_event *event)
{
return rb_event_length(event);
}
+EXPORT_SYMBOL_GPL(ring_buffer_event_length);
/* inline for ring buffer fast paths */
static inline void *
@@ -187,9 +192,10 @@ void *ring_buffer_event_data(struct ring_buffer_event *event)
{
return rb_event_data(event);
}
+EXPORT_SYMBOL_GPL(ring_buffer_event_data);
#define for_each_buffer_cpu(buffer, cpu) \
- for_each_cpu_mask(cpu, buffer->cpumask)
+ for_each_cpu(cpu, buffer->cpumask)
#define TS_SHIFT 27
#define TS_MASK ((1ULL << TS_SHIFT) - 1)
@@ -258,11 +264,10 @@ struct ring_buffer_per_cpu {
};
struct ring_buffer {
- unsigned long size;
unsigned pages;
unsigned flags;
int cpus;
- cpumask_t cpumask;
+ cpumask_var_t cpumask;
atomic_t record_disabled;
struct mutex mutex;
@@ -428,7 +433,7 @@ extern int ring_buffer_page_too_big(void);
/**
* ring_buffer_alloc - allocate a new ring_buffer
- * @size: the size in bytes that is needed.
+ * @size: the size in bytes per cpu that is needed.
* @flags: attributes to set for the ring buffer.
*
* Currently the only flag that is available is the RB_FL_OVERWRITE
@@ -453,6 +458,9 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
if (!buffer)
return NULL;
+ if (!alloc_cpumask_var(&buffer->cpumask, GFP_KERNEL))
+ goto fail_free_buffer;
+
buffer->pages = DIV_ROUND_UP(size, BUF_PAGE_SIZE);
buffer->flags = flags;
@@ -460,14 +468,14 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
if (buffer->pages == 1)
buffer->pages++;
- buffer->cpumask = cpu_possible_map;
+ cpumask_copy(buffer->cpumask, cpu_possible_mask);
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;
+ goto fail_free_cpumask;
for_each_buffer_cpu(buffer, cpu) {
buffer->buffers[cpu] =
@@ -487,10 +495,14 @@ struct ring_buffer *ring_buffer_alloc(unsigned long size, unsigned flags)
}
kfree(buffer->buffers);
+ fail_free_cpumask:
+ free_cpumask_var(buffer->cpumask);
+
fail_free_buffer:
kfree(buffer);
return NULL;
}
+EXPORT_SYMBOL_GPL(ring_buffer_alloc);
/**
* ring_buffer_free - free a ring buffer.
@@ -504,8 +516,11 @@ ring_buffer_free(struct ring_buffer *buffer)
for_each_buffer_cpu(buffer, cpu)
rb_free_cpu_buffer(buffer->buffers[cpu]);
+ free_cpumask_var(buffer->cpumask);
+
kfree(buffer);
}
+EXPORT_SYMBOL_GPL(ring_buffer_free);
static void rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer);
@@ -681,6 +696,7 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
mutex_unlock(&buffer->mutex);
return -ENOMEM;
}
+EXPORT_SYMBOL_GPL(ring_buffer_resize);
static inline int rb_null_event(struct ring_buffer_event *event)
{
@@ -839,6 +855,7 @@ rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
* back to us). This allows us to do a simple loop to
* assign the commit to the tail.
*/
+ again:
while (cpu_buffer->commit_page != cpu_buffer->tail_page) {
cpu_buffer->commit_page->page->commit =
cpu_buffer->commit_page->write;
@@ -854,6 +871,17 @@ rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->commit_page->write;
barrier();
}
+
+ /* again, keep gcc from optimizing */
+ barrier();
+
+ /*
+ * If an interrupt came in just after the first while loop
+ * and pushed the tail page forward, we will be left with
+ * a dangling commit that will never go forward.
+ */
+ if (unlikely(cpu_buffer->commit_page != cpu_buffer->tail_page))
+ goto again;
}
static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
@@ -951,12 +979,15 @@ 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;
+ struct buffer_page *tail_page, *head_page, *reader_page, *commit_page;
unsigned long tail, write;
struct ring_buffer *buffer = cpu_buffer->buffer;
struct ring_buffer_event *event;
unsigned long flags;
+ commit_page = cpu_buffer->commit_page;
+ /* we just need to protect against interrupts */
+ barrier();
tail_page = cpu_buffer->tail_page;
write = local_add_return(length, &tail_page->write);
tail = write - length;
@@ -982,7 +1013,7 @@ __rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer,
* it all the way around the buffer, bail, and warn
* about it.
*/
- if (unlikely(next_page == cpu_buffer->commit_page)) {
+ if (unlikely(next_page == commit_page)) {
WARN_ON_ONCE(1);
goto out_unlock;
}
@@ -1260,7 +1291,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
cpu = raw_smp_processor_id();
- if (!cpu_isset(cpu, buffer->cpumask))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
goto out;
cpu_buffer = buffer->buffers[cpu];
@@ -1290,6 +1321,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
ftrace_preempt_enable(resched);
return NULL;
}
+EXPORT_SYMBOL_GPL(ring_buffer_lock_reserve);
static void rb_commit(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
@@ -1336,6 +1368,7 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
return 0;
}
+EXPORT_SYMBOL_GPL(ring_buffer_unlock_commit);
/**
* ring_buffer_write - write data to the buffer without reserving
@@ -1371,7 +1404,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
cpu = raw_smp_processor_id();
- if (!cpu_isset(cpu, buffer->cpumask))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
goto out;
cpu_buffer = buffer->buffers[cpu];
@@ -1397,6 +1430,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
return ret;
}
+EXPORT_SYMBOL_GPL(ring_buffer_write);
static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
{
@@ -1423,6 +1457,7 @@ void ring_buffer_record_disable(struct ring_buffer *buffer)
{
atomic_inc(&buffer->record_disabled);
}
+EXPORT_SYMBOL_GPL(ring_buffer_record_disable);
/**
* ring_buffer_record_enable - enable writes to the buffer
@@ -1435,6 +1470,7 @@ void ring_buffer_record_enable(struct ring_buffer *buffer)
{
atomic_dec(&buffer->record_disabled);
}
+EXPORT_SYMBOL_GPL(ring_buffer_record_enable);
/**
* ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
@@ -1450,12 +1486,13 @@ 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))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
cpu_buffer = buffer->buffers[cpu];
atomic_inc(&cpu_buffer->record_disabled);
}
+EXPORT_SYMBOL_GPL(ring_buffer_record_disable_cpu);
/**
* ring_buffer_record_enable_cpu - enable writes to the buffer
@@ -1469,12 +1506,13 @@ 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))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
cpu_buffer = buffer->buffers[cpu];
atomic_dec(&cpu_buffer->record_disabled);
}
+EXPORT_SYMBOL_GPL(ring_buffer_record_enable_cpu);
/**
* ring_buffer_entries_cpu - get the number of entries in a cpu buffer
@@ -1485,12 +1523,13 @@ 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))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 0;
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->entries;
}
+EXPORT_SYMBOL_GPL(ring_buffer_entries_cpu);
/**
* ring_buffer_overrun_cpu - get the number of overruns in a cpu_buffer
@@ -1501,12 +1540,13 @@ 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))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 0;
cpu_buffer = buffer->buffers[cpu];
return cpu_buffer->overrun;
}
+EXPORT_SYMBOL_GPL(ring_buffer_overrun_cpu);
/**
* ring_buffer_entries - get the number of entries in a buffer
@@ -1529,6 +1569,7 @@ unsigned long ring_buffer_entries(struct ring_buffer *buffer)
return entries;
}
+EXPORT_SYMBOL_GPL(ring_buffer_entries);
/**
* ring_buffer_overrun_cpu - get the number of overruns in buffer
@@ -1551,6 +1592,7 @@ unsigned long ring_buffer_overruns(struct ring_buffer *buffer)
return overruns;
}
+EXPORT_SYMBOL_GPL(ring_buffer_overruns);
static void rb_iter_reset(struct ring_buffer_iter *iter)
{
@@ -1586,6 +1628,7 @@ void ring_buffer_iter_reset(struct ring_buffer_iter *iter)
rb_iter_reset(iter);
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
}
+EXPORT_SYMBOL_GPL(ring_buffer_iter_reset);
/**
* ring_buffer_iter_empty - check if an iterator has no more to read
@@ -1600,6 +1643,7 @@ int ring_buffer_iter_empty(struct ring_buffer_iter *iter)
return iter->head_page == cpu_buffer->commit_page &&
iter->head == rb_commit_index(cpu_buffer);
}
+EXPORT_SYMBOL_GPL(ring_buffer_iter_empty);
static void
rb_update_read_stamp(struct ring_buffer_per_cpu *cpu_buffer,
@@ -1814,7 +1858,7 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
struct buffer_page *reader;
int nr_loops = 0;
- if (!cpu_isset(cpu, buffer->cpumask))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return NULL;
cpu_buffer = buffer->buffers[cpu];
@@ -1866,6 +1910,7 @@ rb_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts)
return NULL;
}
+EXPORT_SYMBOL_GPL(ring_buffer_peek);
static struct ring_buffer_event *
rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
@@ -1926,6 +1971,7 @@ rb_iter_peek(struct ring_buffer_iter *iter, u64 *ts)
return NULL;
}
+EXPORT_SYMBOL_GPL(ring_buffer_iter_peek);
/**
* ring_buffer_peek - peek at the next event to be read
@@ -1987,7 +2033,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
struct ring_buffer_event *event;
unsigned long flags;
- if (!cpu_isset(cpu, buffer->cpumask))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return NULL;
spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
@@ -2003,6 +2049,7 @@ ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts)
return event;
}
+EXPORT_SYMBOL_GPL(ring_buffer_consume);
/**
* ring_buffer_read_start - start a non consuming read of the buffer
@@ -2023,7 +2070,7 @@ ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
struct ring_buffer_iter *iter;
unsigned long flags;
- if (!cpu_isset(cpu, buffer->cpumask))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return NULL;
iter = kmalloc(sizeof(*iter), GFP_KERNEL);
@@ -2045,6 +2092,7 @@ ring_buffer_read_start(struct ring_buffer *buffer, int cpu)
return iter;
}
+EXPORT_SYMBOL_GPL(ring_buffer_read_start);
/**
* ring_buffer_finish - finish reading the iterator of the buffer
@@ -2061,6 +2109,7 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
atomic_dec(&cpu_buffer->record_disabled);
kfree(iter);
}
+EXPORT_SYMBOL_GPL(ring_buffer_read_finish);
/**
* ring_buffer_read - read the next item in the ring buffer by the iterator
@@ -2087,6 +2136,7 @@ ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts)
return event;
}
+EXPORT_SYMBOL_GPL(ring_buffer_read);
/**
* ring_buffer_size - return the size of the ring buffer (in bytes)
@@ -2096,6 +2146,7 @@ unsigned long ring_buffer_size(struct ring_buffer *buffer)
{
return BUF_PAGE_SIZE * buffer->pages;
}
+EXPORT_SYMBOL_GPL(ring_buffer_size);
static void
rb_reset_cpu(struct ring_buffer_per_cpu *cpu_buffer)
@@ -2129,7 +2180,7 @@ 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))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return;
spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
@@ -2142,6 +2193,7 @@ void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu)
spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
}
+EXPORT_SYMBOL_GPL(ring_buffer_reset_cpu);
/**
* ring_buffer_reset - reset a ring buffer
@@ -2154,6 +2206,7 @@ void ring_buffer_reset(struct ring_buffer *buffer)
for_each_buffer_cpu(buffer, cpu)
ring_buffer_reset_cpu(buffer, cpu);
}
+EXPORT_SYMBOL_GPL(ring_buffer_reset);
/**
* rind_buffer_empty - is the ring buffer empty?
@@ -2172,6 +2225,7 @@ int ring_buffer_empty(struct ring_buffer *buffer)
}
return 1;
}
+EXPORT_SYMBOL_GPL(ring_buffer_empty);
/**
* ring_buffer_empty_cpu - is a cpu buffer of a ring buffer empty?
@@ -2182,12 +2236,13 @@ int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu)
{
struct ring_buffer_per_cpu *cpu_buffer;
- if (!cpu_isset(cpu, buffer->cpumask))
+ if (!cpumask_test_cpu(cpu, buffer->cpumask))
return 1;
cpu_buffer = buffer->buffers[cpu];
return rb_per_cpu_empty(cpu_buffer);
}
+EXPORT_SYMBOL_GPL(ring_buffer_empty_cpu);
/**
* ring_buffer_swap_cpu - swap a CPU buffer between two ring buffers
@@ -2205,13 +2260,12 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
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))
+ if (!cpumask_test_cpu(cpu, buffer_a->cpumask) ||
+ !cpumask_test_cpu(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)
+ if (buffer_a->pages != buffer_b->pages)
return -EINVAL;
cpu_buffer_a = buffer_a->buffers[cpu];
@@ -2237,6 +2291,7 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
return 0;
}
+EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);
static void rb_remove_entries(struct ring_buffer_per_cpu *cpu_buffer,
struct buffer_data_page *bpage)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6adf660fc81..c580233add9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -30,7 +30,6 @@
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/kprobes.h>
-#include <linux/seq_file.h>
#include <linux/writeback.h>
#include <linux/stacktrace.h>
@@ -90,10 +89,10 @@ static inline void ftrace_enable_cpu(void)
preempt_enable();
}
-static cpumask_t __read_mostly tracing_buffer_mask;
+static cpumask_var_t __read_mostly tracing_buffer_mask;
#define for_each_tracing_cpu(cpu) \
- for_each_cpu_mask(cpu, tracing_buffer_mask)
+ for_each_cpu(cpu, tracing_buffer_mask)
/*
* ftrace_dump_on_oops - variable to dump ftrace buffer on oops
@@ -287,6 +286,7 @@ static const char *trace_options[] = {
"annotate",
"userstacktrace",
"sym-userobj",
+ "printk-msg-only",
NULL
};
@@ -320,7 +320,7 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
data->pid = tsk->pid;
- data->uid = tsk->uid;
+ data->uid = task_uid(tsk);
data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
data->policy = tsk->policy;
data->rt_priority = tsk->rt_priority;
@@ -678,6 +678,16 @@ void tracing_reset(struct trace_array *tr, int cpu)
ftrace_enable_cpu();
}
+void tracing_reset_online_cpus(struct trace_array *tr)
+{
+ int cpu;
+
+ tr->time_start = ftrace_now(tr->cpu);
+
+ for_each_online_cpu(cpu)
+ tracing_reset(tr, cpu);
+}
+
#define SAVED_CMDLINES 128
static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
@@ -1299,7 +1309,7 @@ enum trace_file_type {
TRACE_FILE_ANNOTATE = 2,
};
-static void trace_iterator_increment(struct trace_iterator *iter, int cpu)
+static void trace_iterator_increment(struct trace_iterator *iter)
{
/* Don't allow ftrace to trace into the ring buffers */
ftrace_disable_cpu();
@@ -1378,7 +1388,7 @@ static void *find_next_entry_inc(struct trace_iterator *iter)
iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts);
if (iter->ent)
- trace_iterator_increment(iter, iter->cpu);
+ trace_iterator_increment(iter);
return iter->ent ? iter : NULL;
}
@@ -1747,6 +1757,13 @@ lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
+static int task_state_char(unsigned long state)
+{
+ int bit = state ? __ffs(state) + 1 : 0;
+
+ return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
/*
* The message is supposed to contain an ending newline.
* If the printing stops prematurely, try to add a newline of our own.
@@ -1794,10 +1811,10 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
return;
- if (cpu_isset(iter->cpu, iter->started))
+ if (cpumask_test_cpu(iter->cpu, iter->started))
return;
- cpu_set(iter->cpu, iter->started);
+ cpumask_set_cpu(iter->cpu, iter->started);
trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
}
@@ -1815,7 +1832,6 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
char *comm;
int S, T;
int i;
- unsigned state;
if (entry->type == TRACE_CONT)
return TRACE_TYPE_HANDLED;
@@ -1861,12 +1877,8 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
trace_assign_type(field, entry);
- T = field->next_state < sizeof(state_to_char) ?
- state_to_char[field->next_state] : 'X';
-
- state = field->prev_state ?
- __ffs(field->prev_state) + 1 : 0;
- S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
+ T = task_state_char(field->next_state);
+ S = task_state_char(field->prev_state);
comm = trace_find_cmdline(field->next_pid);
trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
field->prev_pid,
@@ -2007,10 +2019,8 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
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';
+ T = task_state_char(field->next_state);
+ S = task_state_char(field->prev_state);
ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
field->prev_pid,
field->prev_prio,
@@ -2140,12 +2150,9 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
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 = '+';
+ T = task_state_char(field->next_state);
+ S = entry->type == TRACE_WAKE ? '+' :
+ task_state_char(field->prev_state);
ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
field->prev_pid,
field->prev_prio,
@@ -2232,12 +2239,9 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
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 = '+';
+ T = task_state_char(field->next_state);
+ S = entry->type == TRACE_WAKE ? '+' :
+ task_state_char(field->prev_state);
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);
@@ -2265,6 +2269,25 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
return TRACE_TYPE_HANDLED;
}
+static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
+{
+ struct trace_seq *s = &iter->seq;
+ struct trace_entry *entry = iter->ent;
+ struct print_entry *field;
+ int ret;
+
+ trace_assign_type(field, entry);
+
+ ret = trace_seq_printf(s, field->buf);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ if (entry->flags & TRACE_FLAG_CONT)
+ trace_seq_print_cont(s, iter);
+
+ return TRACE_TYPE_HANDLED;
+}
+
static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
@@ -2345,6 +2368,11 @@ static enum print_line_t print_trace_line(struct trace_iterator *iter)
return ret;
}
+ if (iter->ent->type == TRACE_PRINT &&
+ trace_flags & TRACE_ITER_PRINTK &&
+ trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+ return print_printk_msg_only(iter);
+
if (trace_flags & TRACE_ITER_BIN)
return print_bin_fmt(iter);
@@ -2425,7 +2453,7 @@ __tracing_open(struct inode *inode, struct file *file, int *ret)
/* Notify the tracer early; before we stop tracing. */
if (iter->trace && iter->trace->open)
- iter->trace->open(iter);
+ iter->trace->open(iter);
/* Annotate start of buffers if we had overruns */
if (ring_buffer_overruns(iter->tr->buffer))
@@ -2618,13 +2646,7 @@ static struct file_operations show_traces_fops = {
/*
* Only trace on a CPU if the bitmask is set:
*/
-static cpumask_t tracing_cpumask = CPU_MASK_ALL;
-
-/*
- * When tracing/tracing_cpu_mask is modified then this holds
- * the new bitmask we are about to install:
- */
-static cpumask_t tracing_cpumask_new;
+static cpumask_var_t tracing_cpumask;
/*
* The tracer itself will not take this lock, but still we want
@@ -2646,7 +2668,7 @@ tracing_cpumask_read(struct file *filp, char __user *ubuf,
mutex_lock(&tracing_cpumask_update_lock);
- len = cpumask_scnprintf(mask_str, count, &tracing_cpumask);
+ len = cpumask_scnprintf(mask_str, count, tracing_cpumask);
if (count - len < 2) {
count = -EINVAL;
goto out_err;
@@ -2665,9 +2687,13 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *ppos)
{
int err, cpu;
+ cpumask_var_t tracing_cpumask_new;
+
+ if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL))
+ return -ENOMEM;
mutex_lock(&tracing_cpumask_update_lock);
- err = cpumask_parse_user(ubuf, count, &tracing_cpumask_new);
+ err = cpumask_parse_user(ubuf, count, tracing_cpumask_new);
if (err)
goto err_unlock;
@@ -2678,26 +2704,28 @@ tracing_cpumask_write(struct file *filp, const char __user *ubuf,
* Increase/decrease the disabled counter if we are
* about to flip a bit in the cpumask:
*/
- if (cpu_isset(cpu, tracing_cpumask) &&
- !cpu_isset(cpu, tracing_cpumask_new)) {
+ if (cpumask_test_cpu(cpu, tracing_cpumask) &&
+ !cpumask_test_cpu(cpu, tracing_cpumask_new)) {
atomic_inc(&global_trace.data[cpu]->disabled);
}
- if (!cpu_isset(cpu, tracing_cpumask) &&
- cpu_isset(cpu, tracing_cpumask_new)) {
+ if (!cpumask_test_cpu(cpu, tracing_cpumask) &&
+ cpumask_test_cpu(cpu, tracing_cpumask_new)) {
atomic_dec(&global_trace.data[cpu]->disabled);
}
}
__raw_spin_unlock(&ftrace_max_lock);
local_irq_enable();
- tracing_cpumask = tracing_cpumask_new;
+ cpumask_copy(tracing_cpumask, tracing_cpumask_new);
mutex_unlock(&tracing_cpumask_update_lock);
+ free_cpumask_var(tracing_cpumask_new);
return count;
err_unlock:
mutex_unlock(&tracing_cpumask_update_lock);
+ free_cpumask_var(tracing_cpumask);
return err;
}
@@ -3086,10 +3114,15 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
if (!iter)
return -ENOMEM;
+ if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
+ kfree(iter);
+ return -ENOMEM;
+ }
+
mutex_lock(&trace_types_lock);
/* trace pipe does not show start of buffer */
- cpus_setall(iter->started);
+ cpumask_setall(iter->started);
iter->tr = &global_trace;
iter->trace = current_trace;
@@ -3106,6 +3139,7 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
{
struct trace_iterator *iter = file->private_data;
+ free_cpumask_var(iter->started);
kfree(iter);
atomic_dec(&tracing_reader);
@@ -3724,7 +3758,6 @@ 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;
@@ -3758,8 +3791,6 @@ void ftrace_dump(void)
* and then release the locks again.
*/
- cpus_clear(mask);
-
while (!trace_empty(&iter)) {
if (!cnt)
@@ -3795,19 +3826,28 @@ __init static int tracer_alloc_buffers(void)
{
struct trace_array_cpu *data;
int i;
+ int ret = -ENOMEM;
- /* TODO: make the number of buffers hot pluggable with CPUS */
- tracing_buffer_mask = cpu_possible_map;
+ if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL))
+ goto out;
+
+ if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL))
+ goto out_free_buffer_mask;
+ cpumask_copy(tracing_buffer_mask, cpu_possible_mask);
+ cpumask_copy(tracing_cpumask, cpu_all_mask);
+
+ /* TODO: make the number of buffers hot pluggable with CPUS */
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;
+ goto out_free_cpumask;
}
global_trace.entries = ring_buffer_size(global_trace.buffer);
+
#ifdef CONFIG_TRACER_MAX_TRACE
max_tr.buffer = ring_buffer_alloc(trace_buf_size,
TRACE_BUFFER_FLAGS);
@@ -3815,7 +3855,7 @@ __init static int tracer_alloc_buffers(void)
printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n");
WARN_ON(1);
ring_buffer_free(global_trace.buffer);
- return 0;
+ goto out_free_cpumask;
}
max_tr.entries = ring_buffer_size(max_tr.buffer);
WARN_ON(max_tr.entries != global_trace.entries);
@@ -3845,8 +3885,14 @@ __init static int tracer_alloc_buffers(void)
&trace_panic_notifier);
register_die_notifier(&trace_die_notifier);
+ ret = 0;
- return 0;
+out_free_cpumask:
+ free_cpumask_var(tracing_cpumask);
+out_free_buffer_mask:
+ free_cpumask_var(tracing_buffer_mask);
+out:
+ return ret;
}
early_initcall(tracer_alloc_buffers);
fs_initcall(tracer_init_debugfs);
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5ac697065a4..4d3d381bfd9 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -28,7 +28,7 @@ enum trace_type {
TRACE_GRAPH_RET,
TRACE_GRAPH_ENT,
TRACE_USER_STACK,
- TRACE_BTS,
+ TRACE_HW_BRANCHES,
TRACE_POWER,
__TRACE_LAST_TYPE
@@ -159,10 +159,10 @@ struct trace_branch {
char correct;
};
-struct bts_entry {
+struct hw_branch_entry {
struct trace_entry ent;
- unsigned long from;
- unsigned long to;
+ u64 from;
+ u64 to;
};
struct trace_power {
@@ -278,7 +278,7 @@ extern void __ftrace_bad_type(void);
TRACE_GRAPH_ENT); \
IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
TRACE_GRAPH_RET); \
- IF_ASSIGN(var, ent, struct bts_entry, TRACE_BTS);\
+ IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
__ftrace_bad_type(); \
} while (0)
@@ -368,12 +368,13 @@ struct trace_iterator {
loff_t pos;
long idx;
- cpumask_t started;
+ cpumask_var_t started;
};
int tracing_is_enabled(void);
void trace_wake_up(void);
void tracing_reset(struct trace_array *tr, int cpu);
+void tracing_reset_online_cpus(struct trace_array *tr);
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);
@@ -414,9 +415,7 @@ void trace_function(struct trace_array *tr,
void trace_graph_return(struct ftrace_graph_ret *trace);
int trace_graph_entry(struct ftrace_graph_ent *trace);
-void trace_bts(struct trace_array *tr,
- unsigned long from,
- unsigned long to);
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
void tracing_start_cmdline_record(void);
void tracing_stop_cmdline_record(void);
@@ -580,7 +579,8 @@ enum trace_iterator_flags {
TRACE_ITER_BRANCH = 0x1000,
TRACE_ITER_ANNOTATE = 0x2000,
TRACE_ITER_USERSTACKTRACE = 0x4000,
- TRACE_ITER_SYM_USEROBJ = 0x8000
+ TRACE_ITER_SYM_USEROBJ = 0x8000,
+ TRACE_ITER_PRINTK_MSGONLY = 0x10000
};
/*
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index a4fa2c57e34..366c8c333e1 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -37,22 +37,12 @@ void disable_boot_trace(void)
tracing_stop_sched_switch_record();
}
-static void reset_boot_trace(struct trace_array *tr)
-{
- int cpu;
-
- tr->time_start = ftrace_now(tr->cpu);
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-}
-
static int boot_trace_init(struct trace_array *tr)
{
int cpu;
boot_trace = tr;
- for_each_cpu_mask(cpu, cpu_possible_map)
+ for_each_cpu(cpu, cpu_possible_mask)
tracing_reset(tr, cpu);
tracing_sched_switch_assign_trace(tr);
@@ -130,7 +120,7 @@ struct tracer boot_tracer __read_mostly =
{
.name = "initcall",
.init = boot_trace_init,
- .reset = reset_boot_trace,
+ .reset = tracing_reset_online_cpus,
.print_line = initcall_print_line,
};
diff --git a/kernel/trace/trace_bts.c b/kernel/trace/trace_bts.c
deleted file mode 100644
index 23b76e4690e..00000000000
--- a/kernel/trace/trace_bts.c
+++ /dev/null
@@ -1,276 +0,0 @@
-/*
- * BTS tracer
- *
- * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
- *
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/kallsyms.h>
-
-#include <asm/ds.h>
-
-#include "trace.h"
-
-
-#define SIZEOF_BTS (1 << 13)
-
-static DEFINE_PER_CPU(struct bts_tracer *, tracer);
-static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
-
-#define this_tracer per_cpu(tracer, smp_processor_id())
-#define this_buffer per_cpu(buffer, smp_processor_id())
-
-
-/*
- * Information to interpret a BTS record.
- * This will go into an in-kernel BTS interface.
- */
-static unsigned char sizeof_field;
-static unsigned long debugctl_mask;
-
-#define sizeof_bts (3 * sizeof_field)
-
-static void bts_trace_cpuinit(struct cpuinfo_x86 *c)
-{
- switch (c->x86) {
- case 0x6:
- switch (c->x86_model) {
- case 0x0 ... 0xC:
- break;
- case 0xD:
- case 0xE: /* Pentium M */
- sizeof_field = sizeof(long);
- debugctl_mask = (1<<6)|(1<<7);
- break;
- default:
- sizeof_field = 8;
- debugctl_mask = (1<<6)|(1<<7);
- break;
- }
- break;
- case 0xF:
- switch (c->x86_model) {
- case 0x0:
- case 0x1:
- case 0x2: /* Netburst */
- sizeof_field = sizeof(long);
- debugctl_mask = (1<<2)|(1<<3);
- break;
- default:
- /* sorry, don't know about them */
- break;
- }
- break;
- default:
- /* sorry, don't know about them */
- break;
- }
-}
-
-static inline void bts_enable(void)
-{
- unsigned long debugctl;
-
- rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
- wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl | debugctl_mask);
-}
-
-static inline void bts_disable(void)
-{
- unsigned long debugctl;
-
- rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl);
- wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctl & ~debugctl_mask);
-}
-
-static void bts_trace_reset(struct trace_array *tr)
-{
- int cpu;
-
- tr->time_start = ftrace_now(tr->cpu);
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-}
-
-static void bts_trace_start_cpu(void *arg)
-{
- this_tracer =
- ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
- /* ovfl = */ NULL, /* th = */ (size_t)-1);
- if (IS_ERR(this_tracer)) {
- this_tracer = NULL;
- return;
- }
-
- bts_enable();
-}
-
-static void bts_trace_start(struct trace_array *tr)
-{
- int cpu;
-
- bts_trace_reset(tr);
-
- for_each_cpu_mask(cpu, cpu_possible_map)
- smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
-}
-
-static void bts_trace_stop_cpu(void *arg)
-{
- if (this_tracer) {
- bts_disable();
-
- ds_release_bts(this_tracer);
- this_tracer = NULL;
- }
-}
-
-static void bts_trace_stop(struct trace_array *tr)
-{
- int cpu;
-
- for_each_cpu_mask(cpu, cpu_possible_map)
- smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
-}
-
-static int bts_trace_init(struct trace_array *tr)
-{
- bts_trace_cpuinit(&boot_cpu_data);
- bts_trace_reset(tr);
- bts_trace_start(tr);
-
- return 0;
-}
-
-static void bts_trace_print_header(struct seq_file *m)
-{
-#ifdef __i386__
- seq_puts(m, "# CPU# FROM TO FUNCTION\n");
- seq_puts(m, "# | | | |\n");
-#else
- seq_puts(m,
- "# CPU# FROM TO FUNCTION\n");
- seq_puts(m,
- "# | | | |\n");
-#endif
-}
-
-static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
-{
- struct trace_entry *entry = iter->ent;
- struct trace_seq *seq = &iter->seq;
- struct bts_entry *it;
-
- trace_assign_type(it, entry);
-
- if (entry->type == TRACE_BTS) {
- int ret;
-#ifdef CONFIG_KALLSYMS
- char function[KSYM_SYMBOL_LEN];
- sprint_symbol(function, it->from);
-#else
- char *function = "<unknown>";
-#endif
-
- ret = trace_seq_printf(seq, "%4d 0x%lx -> 0x%lx [%s]\n",
- entry->cpu, it->from, it->to, function);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;;
- return TRACE_TYPE_HANDLED;
- }
- return TRACE_TYPE_UNHANDLED;
-}
-
-void trace_bts(struct trace_array *tr, unsigned long from, unsigned long to)
-{
- struct ring_buffer_event *event;
- struct bts_entry *entry;
- unsigned long irq;
-
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
- if (!event)
- return;
- entry = ring_buffer_event_data(event);
- tracing_generic_entry_update(&entry->ent, 0, from);
- entry->ent.type = TRACE_BTS;
- entry->ent.cpu = smp_processor_id();
- entry->from = from;
- entry->to = to;
- ring_buffer_unlock_commit(tr->buffer, event, irq);
-}
-
-static void trace_bts_at(struct trace_array *tr, size_t index)
-{
- const void *raw = NULL;
- unsigned long from, to;
- int err;
-
- err = ds_access_bts(this_tracer, index, &raw);
- if (err < 0)
- return;
-
- from = *(const unsigned long *)raw;
- to = *(const unsigned long *)((const char *)raw + sizeof_field);
-
- trace_bts(tr, from, to);
-}
-
-static void trace_bts_cpu(void *arg)
-{
- struct trace_array *tr = (struct trace_array *) arg;
- size_t index = 0, end = 0, i;
- int err;
-
- if (!this_tracer)
- return;
-
- bts_disable();
-
- err = ds_get_bts_index(this_tracer, &index);
- if (err < 0)
- goto out;
-
- err = ds_get_bts_end(this_tracer, &end);
- if (err < 0)
- goto out;
-
- for (i = index; i < end; i++)
- trace_bts_at(tr, i);
-
- for (i = 0; i < index; i++)
- trace_bts_at(tr, i);
-
-out:
- bts_enable();
-}
-
-static void trace_bts_prepare(struct trace_iterator *iter)
-{
- int cpu;
-
- for_each_cpu_mask(cpu, cpu_possible_map)
- smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1);
-}
-
-struct tracer bts_tracer __read_mostly =
-{
- .name = "bts",
- .init = bts_trace_init,
- .reset = bts_trace_stop,
- .print_header = bts_trace_print_header,
- .print_line = bts_trace_print_line,
- .start = bts_trace_start,
- .stop = bts_trace_stop,
- .open = trace_bts_prepare
-};
-
-__init static int init_bts_trace(void)
-{
- return register_tracer(&bts_tracer);
-}
-device_initcall(init_bts_trace);
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index e74f6d0a321..9236d7e25a1 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -16,20 +16,10 @@
#include "trace.h"
-static void function_reset(struct trace_array *tr)
-{
- int cpu;
-
- tr->time_start = ftrace_now(tr->cpu);
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-}
-
static void start_function_trace(struct trace_array *tr)
{
tr->cpu = get_cpu();
- function_reset(tr);
+ tracing_reset_online_cpus(tr);
put_cpu();
tracing_start_cmdline_record();
@@ -55,7 +45,7 @@ static void function_trace_reset(struct trace_array *tr)
static void function_trace_start(struct trace_array *tr)
{
- function_reset(tr);
+ tracing_reset_online_cpus(tr);
}
static struct tracer function_trace __read_mostly =
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index af60eef4cbc..930c08e5b38 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -79,7 +79,7 @@ print_graph_cpu(struct trace_seq *s, int cpu)
int i;
int ret;
int log10_this = log10_cpu(cpu);
- int log10_all = log10_cpu(cpus_weight_nr(cpu_online_map));
+ int log10_all = log10_cpu(cpumask_weight(cpu_online_mask));
/*
@@ -231,6 +231,49 @@ trace_branch_is_leaf(struct trace_iterator *iter,
return true;
}
+static enum print_line_t
+print_graph_irq(struct trace_seq *s, unsigned long addr,
+ enum trace_type type, int cpu, pid_t pid)
+{
+ int ret;
+
+ if (addr < (unsigned long)__irqentry_text_start ||
+ addr >= (unsigned long)__irqentry_text_end)
+ return TRACE_TYPE_UNHANDLED;
+
+ if (type == TRACE_GRAPH_ENT) {
+ ret = trace_seq_printf(s, "==========> | ");
+ } else {
+ /* Cpu */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+ ret = print_graph_cpu(s, cpu);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+ /* Proc */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+ ret = print_graph_proc(s, pid);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ ret = trace_seq_printf(s, " | ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
+ /* No overhead */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+ ret = trace_seq_printf(s, " ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
+ ret = trace_seq_printf(s, "<========== |\n");
+ }
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ return TRACE_TYPE_HANDLED;
+}
static enum print_line_t
print_graph_duration(unsigned long long duration, struct trace_seq *s)
@@ -344,7 +387,7 @@ print_graph_entry_leaf(struct trace_iterator *iter,
static enum print_line_t
print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
- struct trace_seq *s)
+ struct trace_seq *s, pid_t pid, int cpu)
{
int i;
int ret;
@@ -357,8 +400,18 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
return TRACE_TYPE_PARTIAL_LINE;
}
- /* No time */
- ret = trace_seq_printf(s, " | ");
+ /* Interrupt */
+ ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
+ if (ret == TRACE_TYPE_UNHANDLED) {
+ /* No time */
+ ret = trace_seq_printf(s, " | ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ } else {
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
@@ -410,7 +463,7 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
if (trace_branch_is_leaf(iter, field))
return print_graph_entry_leaf(iter, field, s);
else
- return print_graph_entry_nested(field, s);
+ return print_graph_entry_nested(field, s, iter->ent->pid, cpu);
}
@@ -474,6 +527,11 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
+
+ ret = print_graph_irq(s, trace->func, TRACE_GRAPH_RET, cpu, ent->pid);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+
return TRACE_TYPE_HANDLED;
}
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
new file mode 100644
index 00000000000..649df22d435
--- /dev/null
+++ b/kernel/trace/trace_hw_branches.c
@@ -0,0 +1,195 @@
+/*
+ * h/w branch tracer for x86 based on bts
+ *
+ * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/ftrace.h>
+#include <linux/kallsyms.h>
+
+#include <asm/ds.h>
+
+#include "trace.h"
+
+
+#define SIZEOF_BTS (1 << 13)
+
+static DEFINE_PER_CPU(struct bts_tracer *, tracer);
+static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
+
+#define this_tracer per_cpu(tracer, smp_processor_id())
+#define this_buffer per_cpu(buffer, smp_processor_id())
+
+
+static void bts_trace_start_cpu(void *arg)
+{
+ if (this_tracer)
+ ds_release_bts(this_tracer);
+
+ this_tracer =
+ ds_request_bts(/* task = */ NULL, this_buffer, SIZEOF_BTS,
+ /* ovfl = */ NULL, /* th = */ (size_t)-1,
+ BTS_KERNEL);
+ if (IS_ERR(this_tracer)) {
+ this_tracer = NULL;
+ return;
+ }
+}
+
+static void bts_trace_start(struct trace_array *tr)
+{
+ int cpu;
+
+ tracing_reset_online_cpus(tr);
+
+ for_each_cpu(cpu, cpu_possible_mask)
+ smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+}
+
+static void bts_trace_stop_cpu(void *arg)
+{
+ if (this_tracer) {
+ ds_release_bts(this_tracer);
+ this_tracer = NULL;
+ }
+}
+
+static void bts_trace_stop(struct trace_array *tr)
+{
+ int cpu;
+
+ for_each_cpu(cpu, cpu_possible_mask)
+ smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
+}
+
+static int bts_trace_init(struct trace_array *tr)
+{
+ tracing_reset_online_cpus(tr);
+ bts_trace_start(tr);
+
+ return 0;
+}
+
+static void bts_trace_print_header(struct seq_file *m)
+{
+ seq_puts(m,
+ "# CPU# FROM TO FUNCTION\n");
+ seq_puts(m,
+ "# | | | |\n");
+}
+
+static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
+{
+ struct trace_entry *entry = iter->ent;
+ struct trace_seq *seq = &iter->seq;
+ struct hw_branch_entry *it;
+
+ trace_assign_type(it, entry);
+
+ if (entry->type == TRACE_HW_BRANCHES) {
+ if (trace_seq_printf(seq, "%4d ", entry->cpu) &&
+ trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
+ it->from, it->to) &&
+ (!it->from ||
+ seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
+ trace_seq_printf(seq, "\n"))
+ return TRACE_TYPE_HANDLED;
+ return TRACE_TYPE_PARTIAL_LINE;;
+ }
+ return TRACE_TYPE_UNHANDLED;
+}
+
+void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
+{
+ struct ring_buffer_event *event;
+ struct hw_branch_entry *entry;
+ unsigned long irq;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, from);
+ entry->ent.type = TRACE_HW_BRANCHES;
+ entry->ent.cpu = smp_processor_id();
+ entry->from = from;
+ entry->to = to;
+ ring_buffer_unlock_commit(tr->buffer, event, irq);
+}
+
+static void trace_bts_at(struct trace_array *tr,
+ const struct bts_trace *trace, void *at)
+{
+ struct bts_struct bts;
+ int err = 0;
+
+ WARN_ON_ONCE(!trace->read);
+ if (!trace->read)
+ return;
+
+ err = trace->read(this_tracer, at, &bts);
+ if (err < 0)
+ return;
+
+ switch (bts.qualifier) {
+ case BTS_BRANCH:
+ trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
+ break;
+ }
+}
+
+static void trace_bts_cpu(void *arg)
+{
+ struct trace_array *tr = (struct trace_array *) arg;
+ const struct bts_trace *trace;
+ unsigned char *at;
+
+ if (!this_tracer)
+ return;
+
+ ds_suspend_bts(this_tracer);
+ trace = ds_read_bts(this_tracer);
+ if (!trace)
+ goto out;
+
+ for (at = trace->ds.top; (void *)at < trace->ds.end;
+ at += trace->ds.size)
+ trace_bts_at(tr, trace, at);
+
+ for (at = trace->ds.begin; (void *)at < trace->ds.top;
+ at += trace->ds.size)
+ trace_bts_at(tr, trace, at);
+
+out:
+ ds_resume_bts(this_tracer);
+}
+
+static void trace_bts_prepare(struct trace_iterator *iter)
+{
+ int cpu;
+
+ for_each_cpu(cpu, cpu_possible_mask)
+ smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1);
+}
+
+struct tracer bts_tracer __read_mostly =
+{
+ .name = "hw-branch-tracer",
+ .init = bts_trace_init,
+ .reset = bts_trace_stop,
+ .print_header = bts_trace_print_header,
+ .print_line = bts_trace_print_line,
+ .start = bts_trace_start,
+ .stop = bts_trace_stop,
+ .open = trace_bts_prepare
+};
+
+__init static int init_bts_trace(void)
+{
+ return register_tracer(&bts_tracer);
+}
+device_initcall(init_bts_trace);
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index 2fb6da6523b..fffcb069f1d 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -22,14 +22,10 @@ static unsigned long prev_overruns;
static void mmio_reset_data(struct trace_array *tr)
{
- int cpu;
-
overrun_detected = false;
prev_overruns = 0;
- tr->time_start = ftrace_now(tr->cpu);
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
+ tracing_reset_online_cpus(tr);
}
static int mmio_trace_init(struct trace_array *tr)
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index a7172a352f6..7bda248daf5 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -39,7 +39,7 @@ static int power_trace_init(struct trace_array *tr)
trace_power_enabled = 1;
- for_each_cpu_mask(cpu, cpu_possible_map)
+ for_each_cpu(cpu, cpu_possible_mask)
tracing_reset(tr, cpu);
return 0;
}
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 863390557b4..df175cb4564 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -49,7 +49,7 @@ probe_sched_switch(struct rq *__rq, struct task_struct *prev,
}
static void
-probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee)
+probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee, int success)
{
struct trace_array_cpu *data;
unsigned long flags;
@@ -72,16 +72,6 @@ probe_sched_wakeup(struct rq *__rq, struct task_struct *wakee)
local_irq_restore(flags);
}
-static void sched_switch_reset(struct trace_array *tr)
-{
- int cpu;
-
- tr->time_start = ftrace_now(tr->cpu);
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-}
-
static int tracing_sched_register(void)
{
int ret;
@@ -197,7 +187,7 @@ void tracing_sched_switch_assign_trace(struct trace_array *tr)
static void start_sched_trace(struct trace_array *tr)
{
- sched_switch_reset(tr);
+ tracing_reset_online_cpus(tr);
tracing_start_sched_switch_record();
}
@@ -221,7 +211,7 @@ static void sched_switch_trace_reset(struct trace_array *tr)
static void sched_switch_trace_start(struct trace_array *tr)
{
- sched_switch_reset(tr);
+ tracing_reset_online_cpus(tr);
tracing_start_sched_switch();
}
@@ -247,3 +237,4 @@ __init static int init_sched_switch_trace(void)
return register_tracer(&sched_switch_trace);
}
device_initcall(init_sched_switch_trace);
+
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 0067b49746c..43586b689e3 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -211,7 +211,7 @@ static void wakeup_reset(struct trace_array *tr)
}
static void
-probe_wakeup(struct rq *rq, struct task_struct *p)
+probe_wakeup(struct rq *rq, struct task_struct *p, int success)
{
int cpu = smp_processor_id();
unsigned long flags;
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index 0b863f2cbc8..d0871bc0aca 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -10,6 +10,7 @@
#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/module.h>
+#include <linux/sysctl.h>
#include <linux/init.h>
#include <linux/fs.h>
#include "trace.h"
@@ -31,6 +32,10 @@ static raw_spinlock_t max_stack_lock =
static int stack_trace_disabled __read_mostly;
static DEFINE_PER_CPU(int, trace_active);
+static DEFINE_MUTEX(stack_sysctl_mutex);
+
+int stack_tracer_enabled;
+static int last_stack_tracer_enabled;
static inline void check_stack(void)
{
@@ -174,7 +179,7 @@ stack_max_size_write(struct file *filp, const char __user *ubuf,
return count;
}
-static struct file_operations stack_max_size_fops = {
+static const struct file_operations stack_max_size_fops = {
.open = tracing_open_generic,
.read = stack_max_size_read,
.write = stack_max_size_write,
@@ -272,7 +277,7 @@ static int t_show(struct seq_file *m, void *v)
return 0;
}
-static struct seq_operations stack_trace_seq_ops = {
+static const struct seq_operations stack_trace_seq_ops = {
.start = t_start,
.next = t_next,
.stop = t_stop,
@@ -288,12 +293,47 @@ static int stack_trace_open(struct inode *inode, struct file *file)
return ret;
}
-static struct file_operations stack_trace_fops = {
+static const struct file_operations stack_trace_fops = {
.open = stack_trace_open,
.read = seq_read,
.llseek = seq_lseek,
};
+int
+stack_trace_sysctl(struct ctl_table *table, int write,
+ struct file *file, void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int ret;
+
+ mutex_lock(&stack_sysctl_mutex);
+
+ ret = proc_dointvec(table, write, file, buffer, lenp, ppos);
+
+ if (ret || !write ||
+ (last_stack_tracer_enabled == stack_tracer_enabled))
+ goto out;
+
+ last_stack_tracer_enabled = stack_tracer_enabled;
+
+ if (stack_tracer_enabled)
+ register_ftrace_function(&trace_ops);
+ else
+ unregister_ftrace_function(&trace_ops);
+
+ out:
+ mutex_unlock(&stack_sysctl_mutex);
+ return ret;
+}
+
+static __init int enable_stacktrace(char *str)
+{
+ stack_tracer_enabled = 1;
+ last_stack_tracer_enabled = 1;
+ return 1;
+}
+__setup("stacktrace", enable_stacktrace);
+
static __init int stack_trace_init(void)
{
struct dentry *d_tracer;
@@ -311,7 +351,8 @@ static __init int stack_trace_init(void)
if (!entry)
pr_warning("Could not create debugfs 'stack_trace' entry\n");
- register_ftrace_function(&trace_ops);
+ if (stack_tracer_enabled)
+ register_ftrace_function(&trace_ops);
return 0;
}
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c
index 54960edb96d..eaca5ad803f 100644
--- a/kernel/trace/trace_sysprof.c
+++ b/kernel/trace/trace_sysprof.c
@@ -196,27 +196,19 @@ static enum hrtimer_restart stack_trace_timer_fn(struct hrtimer *hrtimer)
return HRTIMER_RESTART;
}
-static void start_stack_timer(int cpu)
+static void start_stack_timer(void *unused)
{
- struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
+ struct hrtimer *hrtimer = &__get_cpu_var(stack_trace_hrtimer);
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer->function = stack_trace_timer_fn;
- hrtimer->cb_mode = HRTIMER_CB_IRQSAFE_PERCPU;
hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL);
}
static void start_stack_timers(void)
{
- cpumask_t saved_mask = current->cpus_allowed;
- int cpu;
-
- for_each_online_cpu(cpu) {
- set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
- start_stack_timer(cpu);
- }
- set_cpus_allowed_ptr(current, &saved_mask);
+ on_each_cpu(start_stack_timer, NULL, 1);
}
static void stop_stack_timer(int cpu)
@@ -234,20 +226,10 @@ static void stop_stack_timers(void)
stop_stack_timer(cpu);
}
-static void stack_reset(struct trace_array *tr)
-{
- int cpu;
-
- tr->time_start = ftrace_now(tr->cpu);
-
- for_each_online_cpu(cpu)
- tracing_reset(tr, cpu);
-}
-
static void start_stack_trace(struct trace_array *tr)
{
mutex_lock(&sample_timer_lock);
- stack_reset(tr);
+ tracing_reset_online_cpus(tr);
start_stack_timers();
tracer_enabled = 1;
mutex_unlock(&sample_timer_lock);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-23 23:43:54 +0000