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perf_events: Disable events when we detach them

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If we leave the event in STATE_INACTIVE, any read of the event
after the detach will increase the running count but not the
enabled count and cause funny scaling artefacts.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091123103819.689055515@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-11-23 11:37:25 +01:00 committed by Ingo Molnar
parent 6c2bfcbe58
commit 2e2af50b1f
1 changed files with 2 additions and 0 deletions
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kernel/perf_event.c
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@ -294,6 +294,8 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
if (event->group_leader != event) if (event->group_leader != event)
event->group_leader->nr_siblings--; event->group_leader->nr_siblings--;
event->state = PERF_EVENT_STATE_OFF;
/* /*
* If this was a group event with sibling events then * If this was a group event with sibling events then
* upgrade the siblings to singleton events by adding them * upgrade the siblings to singleton events by adding them