linux-kernel - Re: [RFC PATCH 5/7] sched/fair: Enable CFS periodic tick to update thermal pressure

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Date:   Tue, 4 Dec 2018 16:43:58 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Zhang Rui <rui.zhang@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Amit Kachhap <amit.kachhap@...il.com>,
        viresh kumar <viresh.kumar@...aro.org>,
        Javi Merino <javi.merino@...nel.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        Quentin Perret <quentin.perret@....com>,
        Ionela Voinescu <ionela.voinescu@....com>
Subject: Re: [RFC PATCH 5/7] sched/fair: Enable CFS periodic tick to update
 thermal pressure

Hi Thara,

On Tue, 9 Oct 2018 at 18:25, Thara Gopinath <thara.gopinath@...aro.org> wrote:
>
> Introduce support in CFS periodic tick to trigger the process of
> computing average thermal pressure for a cpu.
>
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
>  kernel/sched/fair.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index b39fb59..7deb1d0 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -21,6 +21,7 @@
>   *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
>   */
>  #include "sched.h"
> +#include "thermal.h"
>
>  #include <trace/events/sched.h>
>
> @@ -9557,6 +9558,8 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
>
>         if (static_branch_unlikely(&sched_numa_balancing))
>                 task_tick_numa(rq, curr);
> +
> +       update_periodic_maxcap(rq);

You have to call update_periodic_maxcap() in update_blocked_averages() too
Otherwise, the thermal pressure will not always be updated correctly
for tickless system

>  }
>
>  /*
> --
> 2.1.4
>