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perf: Simplify __perf_event_sync_stat 

Removes constraints from __perf_event_read() by leaving it with
a single callsite; this callsite had ctx->lock held, the other
one does not.

Removes some superfluous code from __perf_event_sync_stat().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212508.918544317@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-11-20 22:19:52 +01:00 committed by Ingo Molnar
parent f6f8378522
commit 3dbebf15c5
1 changed files with 2 additions and 4 deletions
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6
kernel/perf_event.c
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@ -1061,8 +1061,6 @@ static int context_equiv(struct perf_event_context *ctx1,
&& !ctx1->pin_count && !ctx2->pin_count;
}
static void __perf_event_read(void *event);
static void __perf_event_sync_stat(struct perf_event *event,
struct perf_event *next_event)
{
@ -1080,8 +1078,8 @@ static void __perf_event_sync_stat(struct perf_event *event,
*/
switch (event->state) {
case PERF_EVENT_STATE_ACTIVE:
__perf_event_read(event);
break;
event->pmu->read(event);
/* fall-through */
case PERF_EVENT_STATE_INACTIVE:
update_event_times(event);