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SubjectRe: [BUG] perf_event: semantic of PERF_SAMPLE_READ unclear
On Thu, Aug 25, 2011 at 7:32 PM, Peter Zijlstra <> wrote:
> 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..
Are we allowing event from different PMU to be in the same event group?
If so, is that useful?

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