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From: Namhyung Kim <namhyung@kernel.org>
To: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: perf lock record fails
References: <4FF7200B.5060008@gmail.com>
Date: Sat, 07 Jul 2012 10:06:56 +0900
In-Reply-To: <4FF7200B.5060008@gmail.com> (David Ahern's message of "Fri, 06
	Jul 2012 11:27:39 -0600")
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Hi, David

On Fri, 06 Jul 2012 11:27:39 -0600, David Ahern wrote:
> What config options need to be enabled for 'perf lock record' to work?
> I tried a number of custom builds and stock Fedora kernels. I always
> get:
>
> $ perf lock record -- sleep 1
> invalid or unsupported event: 'lock:lock_acquire'
>
> Though trace_lock_acquire exists, CONFIG_LOCKDEP is set, and ftrace is
> enabled.
>
> What am I missing?
>

Weird. AFAICS lock_acquire and lock_release depend on CONFIG_LOCKDEP,
and lock_acquired and lock_contented depend on CONFIG_LOCK_STAT (I guess
it should be warned/commented somewhere?). Maybe CONFIG_EVENT_TRACING?

Thanks,
Namhyung