linux-kernel - Re: [PATCH] sched/fair: schedutil: update only with all info available

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Message-ID: <CAKfTPtB+6LoduwinNxEyTq2TFsOv8jEjnQ3o0M=Sf5viB+PL0w@mail.gmail.com>
Date:   Wed, 11 Apr 2018 09:57:28 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Steve Muckle <smuckle@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>
Subject: Re: [PATCH] sched/fair: schedutil: update only with all info available

On 6 April 2018 at 19:28, Patrick Bellasi <patrick.bellasi@....com> wrote:

>  }
> @@ -5454,8 +5441,11 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
>                 update_cfs_group(se);
>         }
>
> -       if (!se)
> +       /* The task is no more visible from the root cfs_rq */
> +       if (!se) {
>                 sub_nr_running(rq, 1);
> +               cpufreq_update_util(rq, 0);

call to cpufreq_update_util() should be done after util_est_dequeue()

> +       }
>
>         util_est_dequeue(&rq->cfs, p, task_sleep);
>         hrtick_update(rq);