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locking/lock_events: Add locking events for lockdep

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Add some lock events to lockdep to profile its behavior.

Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250307232717.1759087-5-boqun.feng@gmail.com
This commit is contained in:
Waiman Long
2025-03-07 15:26:54 -08:00
committed by Ingo Molnar
parent b76b44fb65
commit a94d32446a
2 changed files with 14 additions and 1 deletions
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7
kernel/locking/lock_events_list.h
View File

@@ -88,3 +88,10 @@ LOCK_EVENT(rtmutex_slow_acq3) /* # of locks acquired in *block() */
LOCK_EVENT(rtmutex_slow_sleep) /* # of sleeps */
LOCK_EVENT(rtmutex_slow_wake) /* # of wakeup's */
LOCK_EVENT(rtmutex_deadlock) /* # of rt_mutex_handle_deadlock()'s */
/*
* Locking events for lockdep
*/
LOCK_EVENT(lockdep_acquire)
LOCK_EVENT(lockdep_lock)
LOCK_EVENT(lockdep_nocheck)

8
kernel/locking/lockdep.c
View File

@@ -61,6 +61,7 @@
#include <asm/sections.h>
#include "lockdep_internals.h"
#include "lock_events.h"
#include <trace/events/lock.h>
@@ -170,6 +171,7 @@ static struct task_struct *lockdep_selftest_task_struct;
static int graph_lock(void)
{
lockdep_lock();
lockevent_inc(lockdep_lock);
/*
* Make sure that if another CPU detected a bug while
* walking the graph we dont change it (while the other
@@ -5091,8 +5093,12 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
if (unlikely(lock->key == &__lockdep_no_track__))
return 0;
if (!prove_locking || lock->key == &__lockdep_no_validate__)
lockevent_inc(lockdep_acquire);
if (!prove_locking || lock->key == &__lockdep_no_validate__) {
check = 0;
lockevent_inc(lockdep_nocheck);
}
if (subclass < NR_LOCKDEP_CACHING_CLASSES)
class = lock->class_cache[subclass];