linux-kernel - Re: [Patch v4 3/6] sched/fair: Enable CFS periodic tick to update thermal pressure

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Message-ID: <a303b61e-42f6-dfd7-264b-ead91da5f5ca@arm.com>
Date:   Thu, 31 Oct 2019 17:11:52 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Thara Gopinath <thara.gopinath@...aro.org>, mingo@...hat.com,
        peterz@...radead.org, ionela.voinescu@....com,
        vincent.guittot@...aro.org, rui.zhang@...el.com,
        edubezval@...il.com, qperret@...gle.com
Cc:     linux-kernel@...r.kernel.org, amit.kachhap@...il.com,
        javi.merino@...nel.org, daniel.lezcano@...aro.org
Subject: Re: [Patch v4 3/6] sched/fair: Enable CFS periodic tick to update
 thermal pressure

On 22.10.19 22:34, Thara Gopinath 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 | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 682a754..4f9c2cb 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>
>  
> @@ -7574,6 +7575,8 @@ static void update_blocked_averages(int cpu)
>  		done = false;
>  
>  	update_blocked_load_status(rq, !done);
> +
> +	trigger_thermal_pressure_average(rq);
>  	rq_unlock_irqrestore(rq, &rf);
>  }

Since you update the thermal pressure signal in CFS's
update_blocked_averages() as well, I guess the patch title has to change.

>  
> @@ -9933,6 +9936,8 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
>  
>  	update_misfit_status(curr, rq);
>  	update_overutilized_status(task_rq(curr));
> +
> +	trigger_thermal_pressure_average(rq);
>  }
>  
>  /*
>