linux-kernel - Re: [PATCH] sched/fair: avoid vruntime compensation for SCHED

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Message-ID: <CAKfTPtC203mVB6QB1APbZ5igavdcwbJsCQH_8K__rhGxi+KXoQ@mail.gmail.com>
Date:   Thu, 20 Aug 2020 16:09:17 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jiang Biao <benbjiang@...il.com>, Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jiang Biao <benbjiang@...cent.com>
Subject: Re: [PATCH] sched/fair: avoid vruntime compensation for SCHED_IDLE task

On Thu, 20 Aug 2020 at 15:44, <peterz@...radead.org> wrote:
>
> > That's been said, not compensating the vruntime for a sched_idle task
> > makes sense for me. Even if that will only help for others task in the
> > same cfs_rq
>
> Yeah, but it is worth the extra pointer chasing and branches?

For that I let Jiang provides figures to show the worthful

>
> Then again, I suppose we started all that with the idle_h_nr_running
> nonsense :/