linux-kernel - Re: [BUG] perf_event: semantic of PERF_SAMPLE

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Message-ID: <1314293560.27911.38.camel@twins>
Date:	Thu, 25 Aug 2011 19:32:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	Robert Richter <robert.richter@....com>,
	Vince Weaver <vweaver1@...s.utk.edu>
Subject: Re: [BUG] perf_event: semantic of PERF_SAMPLE_READ unclear

On Thu, 2011-08-25 at 19:19 +0200, Stephane Eranian wrote:
> But the difficulty is that
> we cannot grab any locks, not sure we need one given the call path. 

Nah we should be able to simply iterate all siblings and update them
in-place, since its group members they should all be co-scheduled. The
only difficulty is cross pmu group members.. 
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