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Subject: Re: disabling group leader perf_event
From: Peter Zijlstra <peterz@infradead.org>
To: Avi Kivity <avi@redhat.com>
Cc: linux-perf-users@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@elte.hu>
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Date: Mon, 06 Sep 2010 13:24:16 +0200
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On Mon, 2010-09-06 at 12:12 +0300, Avi Kivity wrote:
> If I read the code correctly, disabling a group leader perf_event will 
> disable the entire group.
> 
> Is this correct?

Yeah, pretty much.

> If so, how can I disable just the event itself?  Can I allocate a dummy 
> invent for the group leader so I can enable and disable each perf_event 
> in the group individually?

Which makes me wonder why you use groups in the first place.