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Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to SCHED_FIFO task

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Hi,

On 11/11/2016 11:22, Viresh Kumar wrote:
> If slow path frequency changes are conducted in a SCHED_OTHER context
> then they may be delayed for some amount of time, including
> indefinitely, when real time or deadline activity is taking place.
>
> Move the slow path to a real time kernel thread. In the future the
> thread should be made SCHED_DEADLINE.

would you have an insight, as to what runtime/deadline/period to set, and/or
what specific timing constraints you'd like to set, just for this cpufreq
slowpath work?

> The RT priority is arbitrarily set
> to 50 for now.
[...]
> +	struct sched_param param = { .sched_priority = 50 };

won't you have a tunable here? (sysctl?)

Thanks,

	T.
-- 
Tommaso Cucinotta, Computer Engineering PhD
Associate Professor at the Real-Time Systems Laboratory (ReTiS)
Scuola Superiore Sant'Anna, Pisa, Italy
http://retis.sssup.it/people/tommaso

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[PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-11 11:30 +0100
  Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Tommaso Cucinotta <tommaso.cucinotta@sssup.it> - 2016-11-11 15:40 +0100
    Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Peter Zijlstra <peterz@infradead.org> - 2016-11-11 15:40 +0100
      Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-12 06:30 +0100
        Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Peter Zijlstra <peterz@infradead.org> - 2016-11-14 10:30 +0100
          Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-14 11:30 +0100
    Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-12 06:30 +0100
  Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task "Rafael J. Wysocki" <rafael@kernel.org> - 2016-11-11 23:20 +0100
    Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue  to SCHED_FIFO task Saravana Kannan <skannan@codeaurora.org> - 2016-11-12 02:40 +0100
      Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-12 06:30 +0100
        Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-14 06:40 +0100
      Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task "Rafael J. Wysocki" <rafael@kernel.org> - 2016-11-13 15:40 +0100
        Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Steve Muckle <smuckle.linux@gmail.com> - 2016-11-13 20:50 +0100
          Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task "Rafael J. Wysocki" <rafael@kernel.org> - 2016-11-13 23:50 +0100
            Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-14 07:40 +0100
    Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Viresh Kumar <viresh.kumar@linaro.org> - 2016-11-12 06:30 +0100
    Re: [PATCH 2/3] cpufreq: schedutil: move slow path from workqueue to  SCHED_FIFO task Steve Muckle <smuckle.linux@gmail.com> - 2016-11-13 21:00 +0100

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