perf/core: Add PERF_AUX_FLAG_COLLISION to report colliding samples

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The ARM SPE architecture permits an implementation to ignore a sample
if the sample is due to be taken whilst another sample is already being
produced. In this case, it is desirable to report the collision to
userspace, as they may want to lower the sample period.

This patch adds a PERF_AUX_FLAG_COLLISION flag, so that such events can
be relayed to userspace.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Will Deacon 2016-09-23 14:05:12 +01:00

parent bc1d202023

commit 085b30625e

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include/uapi/linux/perf_event.h

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