perf/core: Add a new PERF_EV_CAP_SIBLING event capability

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Current perf assumes that events in a group are independent. Close an
event doesn't impact the value of the other events in the same group.
If the closed event is a member, after the event closure, other events
are still running like a group. If the closed event is a leader, other
events are running as singleton events.

Add PERF_EV_CAP_SIBLING to allow events to indicate they require being
part of a group, and when the leader dies they cannot exist
independently.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200723171117.9918-8-kan.liang@linux.intel.com

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Kan Liang 2020-07-23 10:11:10 -07:00 • committed by Peter Zijlstra

parent 58da7dbe6f

commit 9f0c4fa111

2 changed files with 37 additions and 5 deletions

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4

include/linux/perf_event.h

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38

kernel/events/core.c

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