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Signed-off-by: zihan zhou <15645113830zzh@gmail.com> Reviewed-by: Vincent Guittot Tested-by: Vincent Guittot --- kernel/sched/fair.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3e9ca38512de..7777d110d053 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -8851,8 +8851,19 @@ static void check_preempt_wakeup_fair(struct rq *rq,= struct task_struct *p, int * Preempt an idle entity in favor of a non-idle entity (and don't preempt * in the inverse case). */ - if (cse_is_idle && !pse_is_idle) + if (cse_is_idle && !pse_is_idle) { + + /* + * When non-idle entity preempt an idle entity, + * don't give idle entity slice protection. + */ + if (se->vlag =3D=3D se->deadline) + se->vlag =3D se->deadline + 1; + goto preempt; + + } + if (cse_is_idle !=3D pse_is_idle) return; =20 --=20 2.33.0