[PATCH v2 1/3] sched/fair: avoid burst statistic if it's not set

[Honglei Wang]

It's not necessary to do burst associated statistic and calculation for
runtime if the burst feature is not set at all. Just return at the very
start point if so.

Signed-off-by: Honglei Wang <wanghonglei@xxxxxxxxxxxxxxx>
---
 kernel/sched/fair.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6e476f6d9435..2cd626c22912 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4640,6 +4640,11 @@ void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b)
 	if (unlikely(cfs_b->quota == RUNTIME_INF))
 		return;
 
+	if (cfs_b->burst == 0 && cfs_b->runtime_snap == cfs_b->quota) {
+		cfs_b->runtime = cfs_b->quota;
+		return;
+	}
+
 	cfs_b->runtime += cfs_b->quota;
 	runtime = cfs_b->runtime_snap - cfs_b->runtime;
 	if (runtime > 0) {
-- 
2.14.1