]> git.baikalelectronics.ru Git - kernel.git/commit
perf/core: Add a new PERF_EV_CAP_SIBLING event capability
authorKan Liang <kan.liang@linux.intel.com>
Thu, 23 Jul 2020 17:11:10 +0000 (10:11 -0700)
committerPeter Zijlstra <peterz@infradead.org>
Tue, 18 Aug 2020 14:34:36 +0000 (16:34 +0200)
commit1a82874eecc283e464c4fc261e3fb20df1061c46
tree8844a4fa766a0e13506fa6dd81d5fd428df31bb1
parent6e41b188e4e070aeca2cc9c2c1aaa8d02f744369
perf/core: Add a new PERF_EV_CAP_SIBLING event capability

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
include/linux/perf_event.h
kernel/events/core.c