linux-kernel - Re: [PATCH] thermal: Use power efficient workqueue

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Date:   Wed, 3 Jan 2018 10:43:40 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>,
        linux-pm@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH] thermal: Use power efficient workqueue

On 3 January 2018 at 10:24, Leo Yan <leo.yan@...aro.org> wrote:
> Thermal core framework uses the system_freezable_wq workqueue as its
> workqueue for polling temperature. Using system_freezable_wq workqueue
> prevents the scheduler to make smart decision about the best place to
> schedule the work.
>
> This commit replaces system_freezable_wq with
> system_freezable_power_efficient_wq. With kernel configuration
> CONFIG_WQ_POWER_EFFICIENT is enabled, the work can be scheduled on the
> best CPU from a power or a performance point of view.
>
> This commit is inspired by Vincent Guittot patch "netfilter: conntrack:
> use power efficient workqueue" and verified on 96boards Hikey960.
>
> Cc: Eduardo Valentin <edubezval@...il.com>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Vincent Guittot <vincent.guittot@...aro.org>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Acked-by: Vincent Guittot <vincent.guittot@...aro.org>

> ---
>  drivers/thermal/thermal_core.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 2b1b0ba..ba90f71 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -293,11 +293,12 @@ static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
>                                             int delay)
>  {
>         if (delay > 1000)
> -               mod_delayed_work(system_freezable_wq, &tz->poll_queue,
> +               mod_delayed_work(system_freezable_power_efficient_wq,
> +                                &tz->poll_queue,
>                                  round_jiffies(msecs_to_jiffies(delay)));
>         else if (delay)
> -               mod_delayed_work(system_freezable_wq, &tz->poll_queue,
> -                                msecs_to_jiffies(delay));
> +               mod_delayed_work(system_freezable_power_efficient_wq,
> +                                &tz->poll_queue, msecs_to_jiffies(delay));
>         else
>                 cancel_delayed_work(&tz->poll_queue);
>  }
> --
> 2.7.4
>