From: Leo Yan <leo.yan@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Waiman Long <longman@redhat.com>,
Boqun Feng <boqun.feng@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
linux-kernel@vger.kernel.org
Cc: Leo Yan <leo.yan@linaro.org>
Subject: [PATCH] locking/lockdep: Correct calling tracepoints
Date: Wed, 12 May 2021 20:09:37 +0800 [thread overview]
Message-ID: <20210512120937.90211-1-leo.yan@linaro.org> (raw)
The commit eb1f00237aca ("lockdep,trace: Expose tracepoints") reverses
tracepoints for lock_contended() and lock_acquired(), thus the ftrace
log shows the wrong locking sequence that "acquired" event is prior to
"contended" event:
<idle>-0 [001] d.s3 20803.501685: lock_acquire: 0000000008b91ab4 &sg_policy->update_lock
<idle>-0 [001] d.s3 20803.501686: lock_acquired: 0000000008b91ab4 &sg_policy->update_lock
<idle>-0 [001] d.s3 20803.501689: lock_contended: 0000000008b91ab4 &sg_policy->update_lock
<idle>-0 [001] d.s3 20803.501690: lock_release: 0000000008b91ab4 &sg_policy->update_lock
This patch fixes calling tracepoints for lock_contended() and
lock_acquired().
Fixes: eb1f00237aca ("lockdep,trace: Expose tracepoints")
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
kernel/locking/lockdep.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 48d736aa03b2..7641bd407239 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -5736,7 +5736,7 @@ void lock_contended(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
- trace_lock_acquired(lock, ip);
+ trace_lock_contended(lock, ip);
if (unlikely(!lock_stat || !lockdep_enabled()))
return;
@@ -5754,7 +5754,7 @@ void lock_acquired(struct lockdep_map *lock, unsigned long ip)
{
unsigned long flags;
- trace_lock_contended(lock, ip);
+ trace_lock_acquired(lock, ip);
if (unlikely(!lock_stat || !lockdep_enabled()))
return;
--
2.25.1
next reply other threads:[~2021-05-12 12:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 12:09 Leo Yan [this message]
2021-05-12 12:37 ` Peter Zijlstra
2021-05-12 13:32 ` Steven Rostedt
2021-05-12 14:05 ` Peter Zijlstra
2021-05-12 15:14 ` Steven Rostedt
2021-05-12 16:54 ` Peter Zijlstra
2021-05-19 8:09 ` [tip: locking/urgent] " tip-bot2 for Leo Yan
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