linux-kernel - Re: [PATCH] locking/lockdep: Correct calling tracepoints

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Message-ID: <20210512093202.5fca1259@gandalf.local.home>
Date:   Wed, 12 May 2021 09:32:02 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Leo Yan <leo.yan@...aro.org>, Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] locking/lockdep: Correct calling tracepoints

On Wed, 12 May 2021 14:37:12 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> On Wed, May 12, 2021 at 08:09:37PM +0800, Leo Yan wrote:
> > 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@...aro.org>  
> 
> No idea how that happened, curious. Thanks for fixing though!

    Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
    Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
    Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
    Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
    Tested-by: Marco Elver <elver@...gle.com>

That's embarrassing :-p

-- Steve