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Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler utilization data

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On Thu, Mar 03, 2016 at 03:01:15PM +0100, Vincent Guittot wrote:
> > In case a more formal derivation of this formula is needed, it is
> > based on the following 3 assumptions:
> >
> > (1) Performance is a linear function of frequency.
> > (2) Required performance is a linear function of the utilization ratio
> > x = util/max as provided by the scheduler (0 <= x <= 1).
> 
> Just to mention that the utilization that you are using, varies with
> the frequency which add another variable in your equation

Right, x86 hasn't implemented arch_scale_freq_capacity(), so the
utilization values we use are all over the map. If we lower freq, the
util will go up, which would result in us bumping the freq again, etc..

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[PATCH 0/6] cpufreq: schedutil governor "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-02 03:30 +0100
  [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler utilization data "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-02 03:30 +0100
    Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Vincent Guittot <vincent.guittot@linaro.org> - 2016-03-02 18:20 +0100
      Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-02 19:00 +0100
        Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-02 23:50 +0100
          Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 13:30 +0100
            Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Juri Lelli <juri.lelli@arm.com> - 2016-03-03 13:40 +0100
            Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-03 17:30 +0100
              Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 17:40 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 17:50 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-04 02:20 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 18:00 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Juri Lelli <juri.lelli@arm.com> - 2016-03-03 18:20 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Juri Lelli <juri.lelli@arm.com> - 2016-03-03 18:00 +0100
          Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Vincent Guittot <vincent.guittot@linaro.org> - 2016-03-03 15:10 +0100
            Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 16:40 +0100
              Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 17:30 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 17:50 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Dietmar Eggemann <dietmar.eggemann@arm.com> - 2016-03-03 18:30 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Peter Zijlstra <peterz@infradead.org> - 2016-03-03 19:30 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Dietmar Eggemann <dietmar.eggemann@arm.com> - 2016-03-03 20:20 +0100
                Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-03 20:00 +0100
        Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Vincent Guittot <vincent.guittot@linaro.org> - 2016-03-03 14:10 +0100
          Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Steve Muckle <steve.muckle@linaro.org> - 2016-03-03 21:10 +0100
            Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data "Rafael J. Wysocki" <rafael@kernel.org> - 2016-03-03 21:30 +0100
              Re: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler  utilization data Steve Muckle <steve.muckle@linaro.org> - 2016-03-03 22:40 +0100
  [PATCH v2 10/10] cpufreq: schedutil: New governor based on scheduler utilization data "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
  [PATCH v2 6/10] cpufreq: Support for fast frequency switching "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
  [PATCH v2 0/10] cpufreq: schedutil governor "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
    [PATCH v2 1/10] cpufreq: Reduce cpufreq_update_util() overhead a bit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
    [PATCH v2 5/10] cpufreq: Move governor attribute set headers to cpufreq.h "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
      Re: [PATCH v2 5/10] cpufreq: Move governor attribute set headers to  cpufreq.h Viresh Kumar <viresh.kumar@linaro.org> - 2016-03-04 07:00 +0100
    [PATCH v2 2/10][Resend] cpufreq: acpi-cpufreq: Make read and write operations more efficient "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
    [PATCH v2 3/10] cpufreq: governor: New data type for management part of dbs_data "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
      Re: [PATCH v2 3/10] cpufreq: governor: New data type for management  part of dbs_data Viresh Kumar <viresh.kumar@linaro.org> - 2016-03-04 07:00 +0100
    [PATCH v2 7/10] cpufreq: Rework the scheduler hooks for triggering updates "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
    [PATCH v2 4/10] cpufreq: governor: Move abstract gov_attr_set code to seperate file "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
      Re: [PATCH v2 4/10] cpufreq: governor: Move abstract gov_attr_set  code to seperate file Viresh Kumar <viresh.kumar@linaro.org> - 2016-03-04 07:00 +0100
    [PATCH v2 8/10] cpufreq: Move scheduler-related code to the sched directory "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100
    [PATCH v2 9/10] cpufreq: sched: Re-introduce cpufreq_update_util() "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-03-04 04:40 +0100

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