[PATCH 3/8] perf: disable events when we detach them

[Peter Zijlstra]

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@xxxxxxxxx>
---
 kernel/perf_event.c |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/kernel/perf_event.c
+++ linux-2.6/kernel/perf_event.c
@@ -294,6 +294,8 @@ list_del_event(struct perf_event *event,
 	if (event->group_leader != event)
 		event->group_leader->nr_siblings--;
 
+	event->state = PERF_EVENT_STATE_OFF;
+
 	/*
 	 * If this was a group event with sibling events then
 	 * upgrade the siblings to singleton events by adding them

-- 

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