linux-kernel - Re: [RFC][PATCH 10/10] sched/eevdf: Use sched_attr::sched

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Date: Tue, 07 May 2024 07:34:54 +0200
From: Mike Galbraith <efault@....de>
To: Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com, 
 juri.lelli@...hat.com, vincent.guittot@...aro.org,
 dietmar.eggemann@....com,  rostedt@...dmis.org, bsegall@...gle.com,
 mgorman@...e.de, bristot@...hat.com,  vschneid@...hat.com,
 linux-kernel@...r.kernel.org
Cc: kprateek.nayak@....com, wuyun.abel@...edance.com, tglx@...utronix.de
Subject: Re: [RFC][PATCH 10/10] sched/eevdf: Use sched_attr::sched_runtime
 to set request/slice suggestion

On Fri, 2024-04-05 at 12:28 +0200, Peter Zijlstra wrote:
> 
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -7812,7 +7823,9 @@ static int __sched_setscheduler(struct t
>          * but store a possible modification of reset_on_fork.
>          */
>         if (unlikely(policy == p->policy)) {
> -               if (fair_policy(policy) && attr->sched_nice != task_nice(p))
> +               if (fair_policy(policy) &&
> +                   (attr->sched_nice != task_nice(p) ||
> +                    (attr->sched_runtime && attr->sched_runtime != p->se.slice)))
>                         goto change;

Can we make that only look at attr->sched_runtime != p->se.slice? 
Doing so lets you clear a custom slice by.. clearing it.. rather than
making tools rummage about for the proper value to overwrite.

	-Mike