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Subject[PATCH v2 1/3] sched/fair: avoid burst statistic if it's not set
Date
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@didichuxing.com>
---
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
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