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authorSoeren Sandmann <sandmann@daimi.au.dk>2009-10-22 18:34:08 +0200
committerIngo Molnar <mingo@elte.hu>2009-10-23 09:35:02 +0200
commit54f4407608c59712a8f5ec1e10dfac40bef5a2e7 (patch)
tree78ab139c78b084d597c3a198b0b713b89ce23da5 /kernel
parent721a669b7225edeeb0ca8e2bf71b83882326a71b (diff)
downloadblackbird-op-linux-54f4407608c59712a8f5ec1e10dfac40bef5a2e7.tar.gz
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perf events: Don't generate events for the idle task when exclude_idle is set
Getting samples for the idle task is often not interesting, so don't generate them when exclude_idle is set for the event in question. Signed-off-by: Søren Sandmann Pedersen <sandmann@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <ye8pr8fmlq7.fsf@camel16.daimi.au.dk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/perf_event.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 33ff019f9aa6..7f29643c8985 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -3959,8 +3959,9 @@ static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer)
regs = task_pt_regs(current);
if (regs) {
- if (perf_event_overflow(event, 0, &data, regs))
- ret = HRTIMER_NORESTART;
+ if (!(event->attr.exclude_idle && current->pid == 0))
+ if (perf_event_overflow(event, 0, &data, regs))
+ ret = HRTIMER_NORESTART;
}
period = max_t(u64, 10000, event->hw.sample_period);
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