linux-kernel - Re: perf: prctl(PR_TASK_PERF_EVENTS

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Date:	Sat, 28 Jan 2012 17:48:08 -0600
From:	Andrew Steets <asteets@...advisors.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: perf: prctl(PR_TASK_PERF_EVENTS_DISABLE) has no effect

On 1/28/12 6:01 AM, Ingo Molnar wrote:

>> prctl(PR_TASK_PERF_EVENTS_DISABLE) doesn't appear to disable
>> perf event counters.  Here is a demonstration program:
>
> btw., what's your usecase?
>

I'm trying to profile a small section of a long-running program.  I ran
into trouble using call-graph recording and I thought this might be an
alternative way of getting what I was after.

-Andrew

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