From 2e2af50b1fab3c40636839a7f439c167ae559533 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra <a.p.zijlstra@chello.nl> Date: Mon, 23 Nov 2009 11:37:25 +0100 Subject: [PATCH] perf_events: Disable events when we detach them 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> --- kernel/perf_event.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 1f14481c2337..fb851ec34461 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -294,6 +294,8 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx) 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 -- 2.50.1