Commit e5f32a38 authored by Ingo Molnar's avatar Ingo Molnar

sched: speed up context-switches a bit

speed up context-switches a bit by not clearing p->exec_start.

(as a side-effect, this also makes p->exec_start a universal timestamp
available to cache-hot estimations.)
Signed-off-by: default avatarIngo Molnar <>
parent 91c234b4
......@@ -379,15 +379,6 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
se->exec_start = rq_of(cfs_rq)->clock;
* We are descheduling a task - update its stats:
static inline void
update_stats_curr_end(struct cfs_rq *cfs_rq, struct sched_entity *se)
se->exec_start = 0;
* Scheduling class queueing methods:
......@@ -609,8 +600,6 @@ static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev)
if (prev->on_rq)
update_stats_curr_end(cfs_rq, prev);
check_spread(cfs_rq, prev);
if (prev->on_rq) {
update_stats_wait_start(cfs_rq, prev);
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