linux-kernel - Re: perf: prctl(PR_TASK_PERF_EVENTS

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Date:	Sun, 29 Jan 2012 17:32:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Steets <asteets@...advisors.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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


* Andrew Steets <asteets@...advisors.com> wrote:

> 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.

That usecase indeed makes sense. Peter, could we allow this for 
privileged tasks, depending on the perf_paranoia settings or 
such?

Thanks,

	Ingo
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