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-rw-r--r--kernel/profile.c109
1 files changed, 46 insertions, 63 deletions
diff --git a/kernel/profile.c b/kernel/profile.c
index 66f841b7fbd..54bf5ba2642 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -8,12 +8,13 @@
* Scheduler profiling support, Arjan van de Ven and Ingo Molnar,
* Red Hat, July 2004
* Consolidation of architecture support code for profiling,
- * William Irwin, Oracle, July 2004
+ * Nadia Yvette Chambers, Oracle, July 2004
* Amortized hit count accounting via per-cpu open-addressed hashtables
- * to resolve timer interrupt livelocks, William Irwin, Oracle, 2004
+ * to resolve timer interrupt livelocks, Nadia Yvette Chambers,
+ * Oracle, 2004
*/
-#include <linux/module.h>
+#include <linux/export.h>
#include <linux/profile.h>
#include <linux/bootmem.h>
#include <linux/notifier.h>
@@ -36,9 +37,6 @@ struct profile_hit {
#define NR_PROFILE_HIT (PAGE_SIZE/sizeof(struct profile_hit))
#define NR_PROFILE_GRP (NR_PROFILE_HIT/PROFILE_GRPSZ)
-/* Oprofile timer tick hook */
-static int (*timer_hook)(struct pt_regs *) __read_mostly;
-
static atomic_t *prof_buffer;
static unsigned long prof_len, prof_shift;
@@ -54,9 +52,9 @@ static DEFINE_MUTEX(profile_flip_mutex);
int profile_setup(char *str)
{
- static char schedstr[] = "schedule";
- static char sleepstr[] = "sleep";
- static char kvmstr[] = "kvm";
+ static const char schedstr[] = "schedule";
+ static const char sleepstr[] = "sleep";
+ static const char kvmstr[] = "kvm";
int par;
if (!strncmp(str, sleepstr, strlen(sleepstr))) {
@@ -66,12 +64,10 @@ int profile_setup(char *str)
str += strlen(sleepstr) + 1;
if (get_option(&str, &par))
prof_shift = par;
- printk(KERN_INFO
- "kernel sleep profiling enabled (shift: %ld)\n",
+ pr_info("kernel sleep profiling enabled (shift: %ld)\n",
prof_shift);
#else
- printk(KERN_WARNING
- "kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
+ pr_warn("kernel sleep profiling requires CONFIG_SCHEDSTATS\n");
#endif /* CONFIG_SCHEDSTATS */
} else if (!strncmp(str, schedstr, strlen(schedstr))) {
prof_on = SCHED_PROFILING;
@@ -79,8 +75,7 @@ int profile_setup(char *str)
str += strlen(schedstr) + 1;
if (get_option(&str, &par))
prof_shift = par;
- printk(KERN_INFO
- "kernel schedule profiling enabled (shift: %ld)\n",
+ pr_info("kernel schedule profiling enabled (shift: %ld)\n",
prof_shift);
} else if (!strncmp(str, kvmstr, strlen(kvmstr))) {
prof_on = KVM_PROFILING;
@@ -88,13 +83,12 @@ int profile_setup(char *str)
str += strlen(kvmstr) + 1;
if (get_option(&str, &par))
prof_shift = par;
- printk(KERN_INFO
- "kernel KVM profiling enabled (shift: %ld)\n",
+ pr_info("kernel KVM profiling enabled (shift: %ld)\n",
prof_shift);
} else if (get_option(&str, &par)) {
prof_shift = par;
prof_on = CPU_PROFILING;
- printk(KERN_INFO "kernel profiling enabled (shift: %ld)\n",
+ pr_info("kernel profiling enabled (shift: %ld)\n",
prof_shift);
}
return 1;
@@ -126,11 +120,9 @@ int __ref profile_init(void)
if (prof_buffer)
return 0;
- prof_buffer = vmalloc(buffer_bytes);
- if (prof_buffer) {
- memset(prof_buffer, 0, buffer_bytes);
+ prof_buffer = vzalloc(buffer_bytes);
+ if (prof_buffer)
return 0;
- }
free_cpumask_var(prof_cpu_mask);
return -ENOMEM;
@@ -209,25 +201,6 @@ int profile_event_unregister(enum profile_type type, struct notifier_block *n)
}
EXPORT_SYMBOL_GPL(profile_event_unregister);
-int register_timer_hook(int (*hook)(struct pt_regs *))
-{
- if (timer_hook)
- return -EBUSY;
- timer_hook = hook;
- return 0;
-}
-EXPORT_SYMBOL_GPL(register_timer_hook);
-
-void unregister_timer_hook(int (*hook)(struct pt_regs *))
-{
- WARN_ON(hook != timer_hook);
- timer_hook = NULL;
- /* make sure all CPUs see the NULL hook */
- synchronize_sched(); /* Allow ongoing interrupts to complete. */
-}
-EXPORT_SYMBOL_GPL(unregister_timer_hook);
-
-
#ifdef CONFIG_SMP
/*
* Each cpu has a pair of open-addressed hashtables for pending
@@ -258,7 +231,7 @@ EXPORT_SYMBOL_GPL(unregister_timer_hook);
* pagetable hash functions, but uses a full hashtable full of finite
* collision chains, not just pairs of them.
*
- * -- wli
+ * -- nyc
*/
static void __profile_flip_buffers(void *unused)
{
@@ -305,14 +278,12 @@ static void profile_discard_flip_buffers(void)
mutex_unlock(&profile_flip_mutex);
}
-void profile_hits(int type, void *__pc, unsigned int nr_hits)
+static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
{
unsigned long primary, secondary, flags, pc = (unsigned long)__pc;
int i, j, cpu;
struct profile_hit *hits;
- if (prof_on != type || !prof_buffer)
- return;
pc = min((pc - (unsigned long)_stext) >> prof_shift, prof_len - 1);
i = primary = (pc & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
secondary = (~(pc << 1) & (NR_PROFILE_GRP - 1)) << PROFILE_GRPSHIFT;
@@ -356,7 +327,7 @@ out:
put_cpu();
}
-static int __cpuinit profile_cpu_callback(struct notifier_block *info,
+static int profile_cpu_callback(struct notifier_block *info,
unsigned long action, void *__cpu)
{
int node, cpu = (unsigned long)__cpu;
@@ -419,24 +390,26 @@ out_free:
#define profile_discard_flip_buffers() do { } while (0)
#define profile_cpu_callback NULL
-void profile_hits(int type, void *__pc, unsigned int nr_hits)
+static void do_profile_hits(int type, void *__pc, unsigned int nr_hits)
{
unsigned long pc;
-
- if (prof_on != type || !prof_buffer)
- return;
pc = ((unsigned long)__pc - (unsigned long)_stext) >> prof_shift;
atomic_add(nr_hits, &prof_buffer[min(pc, prof_len - 1)]);
}
#endif /* !CONFIG_SMP */
+
+void profile_hits(int type, void *__pc, unsigned int nr_hits)
+{
+ if (prof_on != type || !prof_buffer)
+ return;
+ do_profile_hits(type, __pc, nr_hits);
+}
EXPORT_SYMBOL_GPL(profile_hits);
void profile_tick(int type)
{
struct pt_regs *regs = get_irq_regs();
- if (type == CPU_PROFILING && timer_hook)
- timer_hook(regs);
if (!user_mode(regs) && prof_cpu_mask != NULL &&
cpumask_test_cpu(smp_processor_id(), prof_cpu_mask))
profile_hit(type, (void *)profile_pc(regs));
@@ -485,10 +458,10 @@ static const struct file_operations prof_cpu_mask_proc_fops = {
.write = prof_cpu_mask_proc_write,
};
-void create_prof_cpu_mask(struct proc_dir_entry *root_irq_dir)
+void create_prof_cpu_mask(void)
{
/* create /proc/irq/prof_cpu_mask */
- proc_create("prof_cpu_mask", 0600, root_irq_dir, &prof_cpu_mask_proc_fops);
+ proc_create("irq/prof_cpu_mask", 0600, NULL, &prof_cpu_mask_proc_fops);
}
/*
@@ -572,14 +545,14 @@ static int create_hash_tables(void)
struct page *page;
page = alloc_pages_exact_node(node,
- GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
+ GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
0);
if (!page)
goto out_cleanup;
per_cpu(cpu_profile_hits, cpu)[1]
= (struct profile_hit *)page_address(page);
page = alloc_pages_exact_node(node,
- GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
+ GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
0);
if (!page)
goto out_cleanup;
@@ -614,18 +587,28 @@ out_cleanup:
int __ref create_proc_profile(void) /* false positive from hotcpu_notifier */
{
struct proc_dir_entry *entry;
+ int err = 0;
if (!prof_on)
return 0;
- if (create_hash_tables())
- return -ENOMEM;
+
+ cpu_notifier_register_begin();
+
+ if (create_hash_tables()) {
+ err = -ENOMEM;
+ goto out;
+ }
+
entry = proc_create("profile", S_IWUSR | S_IRUGO,
NULL, &proc_profile_operations);
if (!entry)
- return 0;
- entry->size = (1+prof_len) * sizeof(atomic_t);
- hotcpu_notifier(profile_cpu_callback, 0);
- return 0;
+ goto out;
+ proc_set_size(entry, (1 + prof_len) * sizeof(atomic_t));
+ __hotcpu_notifier(profile_cpu_callback, 0);
+
+out:
+ cpu_notifier_register_done();
+ return err;
}
-module_init(create_proc_profile);
+subsys_initcall(create_proc_profile);
#endif /* CONFIG_PROC_FS */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-05 00:25:41 +0000