linux-kernel - Re: [PATCH] sched/fair: Dequeue sched_delayed tasks when waking to a busy CPU

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Message-ID: <81de2f710d8922a47364632335ff5ba1a45625b3.camel@gmx.de>
Date: Tue, 12 Nov 2024 17:15:51 +0100
From: Mike Galbraith <efault@....de>
To: Phil Auld <pauld@...hat.com>
Cc: 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, vschneid@...hat.com,  linux-kernel@...r.kernel.org,
 kprateek.nayak@....com, wuyun.abel@...edance.com, 
 youssefesmat@...omium.org, tglx@...utronix.de
Subject: Re: [PATCH] sched/fair: Dequeue sched_delayed tasks when waking to
 a busy CPU

On Tue, 2024-11-12 at 10:41 -0500, Phil Auld wrote:
> On Tue, Nov 12, 2024 at 03:23:38PM +0100 Mike Galbraith wrote:
>
> >
> > We don't however have to let sched_delayed block SIS though.  Rendering
> > them transparent in idle_cpu() did NOT wreck the progression, so
> > maaaybe could help your regression.
> >
>
> You mean something like:
>
> if (rq->nr_running > rq->h_nr_delayed)
>        return 0;
>
> in idle_cpu() instead of the straight rq->nr_running check?

Yeah, close enough.


	-Mike