From: Jiang Biao <benbji...@tencent.com>
Vruntime compensation has been down in place_entity() to
boot the waking procedure for fair tasks. There is no need to
do that for SCHED_IDLE task actually.
Not compensating vruntime for SCHED_IDLE task could make
SCHED_IDLE task more harmless for normal tasks.
Signed-off-by: Jiang Biao <benbji...@tencent.com>
---
kernel/sched/fair.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1a68a0536add..adff77676a0a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4115,7 +4115,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity
*se, int initial)
vruntime += sched_vslice(cfs_rq, se);
/* sleeps up to a single latency don't count. */
- if (!initial) {
+ if (!initial && likely(!task_has_idle_policy(task_of(se)))) {
unsigned long thresh = sysctl_sched_latency;
/*
--
2.21.0
