linux-kernel - Re: [PATCH] sched/core: forced idle accounting

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Date:   Fri, 8 Oct 2021 14:04:00 -0700
From:   Josh Don <joshdon@...gle.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Vineeth Pillai <vineethrp@...il.com>,
        Hao Luo <haoluo@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched/core: forced idle accounting

On Thu, Oct 7, 2021 at 5:08 PM Josh Don <joshdon@...gle.com> wrote:
>
> @@ -6051,6 +6071,13 @@ static void sched_core_cpu_deactivate(unsigned int cpu)
>         core_rq->core_forceidle     = rq->core_forceidle;
>         core_rq->core_forceidle_seq = rq->core_forceidle_seq;
>
> +       /*
> +        * Accounting edge for forced idle is handled in pick_next_task().
> +        * Don't need another one here, since the hotplug thread shouldn't
> +        * have a cookie.
> +        */
> +       core_rq->core_forceidle_start = 0;
> +
>         /* install new leader */
>         for_each_cpu(t, smt_mask) {
>                 rq = cpu_rq(t);

Realized there needs to be a similar edge in sched_core_flip(). I'll
include that in a v2, after seeing if there are any other comments on
this patch.