[PATCH v5 09/10] perf: optimize event_filter_match during sched_in

[Ian Rogers]

The caller verified the CPU and cgroup so directly call
pmu_filter_match.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 kernel/events/core.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5935d2474050..bcaf100d8167 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2227,8 +2227,11 @@ static inline int pmu_filter_match(struct perf_event *event)
 static inline int
 event_filter_match(struct perf_event *event)
 {
-	return (event->cpu == -1 || event->cpu == smp_processor_id()) &&
-	       perf_cgroup_match(event) && pmu_filter_match(event);
+	if (event->cpu != -1 && event->cpu != smp_processor_id())
+		return 0;
+	if (!perf_cgroup_match(event))
+		return 0;
+	return pmu_filter_match(event);
 }
 
 static void
@@ -3577,7 +3580,11 @@ static int merge_sched_in(struct perf_event_context *ctx,
 	if (event->state <= PERF_EVENT_STATE_OFF)
 		return 0;
 
-	if (!event_filter_match(event))
+	/*
+	 * Avoid full event_filter_match as the caller verified the CPU and
+	 * cgroup before calling.
+	 */
+	if (!pmu_filter_match(event))
 		return 0;
 
 	if (group_can_go_on(event, cpuctx, 1)) {
-- 
2.24.0.393.g34dc348eaf-goog