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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-05-21 14:43:08 +0200
committerIngo Molnar <mingo@elte.hu>2010-06-09 11:12:37 +0200
commite78505958cf123048fb48cb56b79cebb8edd15fb (patch)
tree3688d124cdc906cbe9f6587c8671ba0a14c95262 /arch/sh
parenta6e6dea68c18f705957573ee5596097c7e82d0e5 (diff)
perf: Convert perf_event to local_t
Since now all modification to event->count (and ->prev_count and ->period_left) are local to a cpu, change then to local64_t so we avoid the LOCK'ed ops. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/kernel/perf_event.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/sh/kernel/perf_event.c b/arch/sh/kernel/perf_event.c
index 81b6de41ae5d..7a3dc3567258 100644
--- a/arch/sh/kernel/perf_event.c
+++ b/arch/sh/kernel/perf_event.c
@@ -185,10 +185,10 @@ static void sh_perf_event_update(struct perf_event *event,
* this is the simplest approach for maintaining consistency.
*/
again:
- prev_raw_count = atomic64_read(&hwc->prev_count);
+ prev_raw_count = local64_read(&hwc->prev_count);
new_raw_count = sh_pmu->read(idx);
- if (atomic64_cmpxchg(&hwc->prev_count, prev_raw_count,
+ if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
new_raw_count) != prev_raw_count)
goto again;
@@ -203,7 +203,7 @@ again:
delta = (new_raw_count << shift) - (prev_raw_count << shift);
delta >>= shift;
- atomic64_add(delta, &event->count);
+ local64_add(delta, &event->count);
}
static void sh_pmu_disable(struct perf_event *event)