linux-kernel - Re: [PATCH 2/2] locking: Apply contention tracepoints in the slow path

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Date:   Fri, 1 Apr 2022 11:25:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Byungchul Park <byungchul.park@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Arnd Bergmann <arnd@...db.de>,
        Radoslaw Burny <rburny@...gle.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Hyeonggon Yoo <42.hyeyoo@...il.com>
Subject: Re: [PATCH 2/2] locking: Apply contention tracepoints in the slow
 path

On Thu, Mar 31, 2022 at 11:26:17PM -0700, Namhyung Kim wrote:
> On Thu, Mar 31, 2022 at 01:59:16PM +0200, Peter Zijlstra wrote:
> > I've since pushed out the lot to:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core
> > 
> > It builds, but I've not actually used it. Much appreciated if you could
> > test.
> > 
> 
> I've tested it and it worked well.  Thanks for your work!
> 
> And we need to add the below too..

Thanks

> ----8<----
> 
> diff --git a/include/trace/events/lock.h b/include/trace/events/lock.h
> index db5bdbb9b9c0..9463a93132c3 100644
> --- a/include/trace/events/lock.h
> +++ b/include/trace/events/lock.h
> @@ -114,7 +114,8 @@ TRACE_EVENT(contention_begin,
>  				{ LCB_F_READ,		"READ" },
>  				{ LCB_F_WRITE,		"WRITE" },
>  				{ LCB_F_RT,		"RT" },
> -				{ LCB_F_PERCPU,		"PERCPU" }
> +				{ LCB_F_PERCPU,		"PERCPU" },
> +				{ LCB_F_MUTEX,		"MUTEX" }
>  			  ))
>  );

Duh, indeed, folded!