Re: [BUG] perf_event: semantic of PERF_SAMPLE_READ unclear

[Peter Zijlstra]

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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