linux-kernel - Re: x86_pmu_start WARN

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Message-ID: <20140220140426.6d17001c@gandalf.local.home>
Date:	Thu, 20 Feb 2014 14:04:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: x86_pmu_start WARN_ON.

On Thu, 20 Feb 2014 19:15:38 +0100
Peter Zijlstra <peterz@...radead.org> wrote:


> I think by using the /debug/tracing/events/ftrace/function event, but
> I'm not actually sure, I've never used it nor did I write the code to do
> it. Jolsa did all that IIRC.
> 
> All I know is that we had some 'fun' bugs around there sometime back.

Note, the function tracer now has a lot better recursion protection than
it use to.

-- Steve
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