Re: [PATCH V1] sched: Cancel the slice protection of the idle entity
From: zihan zhou
Date: Sat Feb 08 2025 - 03:30:28 EST
> > A wakeup non-idle entity should preempt idle entity at any time,
> > but because of the slice protection of the idle entity, the non-idle
> > entity has to wait, so just cancel it.
> >
> > Signed-off-by: zihan zhou <15645113830zzh@xxxxxxxxx>
> > ---
> > 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 == se->deadline)
> > + se->vlag = se->deadline + 1;
> > +
> > goto preempt;
> > +
> > + }
>
> Yes, I suppose we can do this.
Thank you very much for your affirmation!