From: jun qian <[email protected]> If it has been determined that the current cpu need resched in the early stage of for_each_sched_entity, then there is no need to check preempt in the subsequent se->parent entity_tick.
Signed-off-by: jun qian <[email protected]> --- kernel/sched/fair.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 1a68a0536add..c0d135100d54 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4352,8 +4352,13 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr) { unsigned long ideal_runtime, delta_exec; struct sched_entity *se; + struct rq *rq = rq_of(cfs_rq); s64 delta; + /* If the TIF_NEED_RESCHED has been set, it is no need to check again */ + if (test_tsk_need_resched(rq->curr)) + return; + ideal_runtime = sched_slice(cfs_rq, curr); delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime; if (delta_exec > ideal_runtime) { -- 2.18.2
