linux-kernel - Re: [PATCH 2/2] thermal: cpufreq_cooling: Reuse effective_cpu

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Date:   Tue, 14 Jul 2020 10:23:52 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Javi Merino <javi.merino@...nel.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        linux-kernel@...r.kernel.org, Quentin Perret <qperret@...gle.com>,
        Rafael Wysocki <rjw@...ysocki.net>, linux-pm@...r.kernel.org
Subject: Re: [PATCH 2/2] thermal: cpufreq_cooling: Reuse effective_cpu_util()

On Tue, Jul 14, 2020 at 12:06:53PM +0530, Viresh Kumar wrote:
> Several parts of the kernel are already using the effective CPU
> utilization to get the current load on the CPU, do the same here instead
> of depending on the idle time of the CPU, which isn't that accurate
> comparatively.
> 
> Note that, this (and CPU frequency scaling in general) doesn't work that
> well with idle injection as that is done from rt threads and is counted
> as load while it tries to do quite the opposite. That should be solved
> separately though.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/thermal/cpufreq_cooling.c | 65 +++++++------------------------
>  1 file changed, 15 insertions(+), 50 deletions(-)
> 
> diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
> index 6c0e1b053126..74340b2b0da7 100644
> --- a/drivers/thermal/cpufreq_cooling.c
> +++ b/drivers/thermal/cpufreq_cooling.c
> @@ -23,6 +23,7 @@
>  #include <linux/thermal.h>
>  
>  #include <trace/events/thermal.h>
> +#include "../../kernel/sched/sched.h"

Hard NAK on that. Just writing it should've been a clue.