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Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit

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On Thursday, February 16, 2017 01:36:05 PM Peter Zijlstra wrote:
> On Thu, Feb 16, 2017 at 03:42:10PM +0530, Viresh Kumar wrote:
> > But when I discussed this with Vincent, he suggested that it may not be required
> > at all as the scheduler (with the helped of "decayed") doesn't call into
> > schedutil too often, i.e. at least 1 ms. And if the CPUs are stable enough (i.e.
> > no interruptions to the running task), we wouldn't reevaluate before the next
> > tick.
> 
> There are still the attach/detach callers to cfs_rq_util_change() that
> kick in for fork/exit and migration.
> 
> But yes, barring those we shouldn't end up calling it at silly rates.

OK

Does this mean that running governor computations every time its callback
is invoked by the scheduler would be fine?

Thanks,
Rafael

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[PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-15 18:20 +0100
  Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-15 23:50 +0100
    Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-16 00:00 +0100
      Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-16 01:10 +0100
        Re: [PATCH] cpufreq: schedutil: govern how frequently we change  frequency with rate_limit Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-16 11:20 +0100
          Re: [PATCH] cpufreq: schedutil: govern how frequently we change  frequency with rate_limit Peter Zijlstra <peterz@infradead.org> - 2017-02-16 13:40 +0100
            Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-17 13:30 +0100
              Re: [PATCH] cpufreq: schedutil: govern how frequently we change  frequency with rate_limit Peter Zijlstra <peterz@infradead.org> - 2017-02-17 13:50 +0100
                Re: [PATCH] cpufreq: schedutil: govern how frequently we change  frequency with rate_limit Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-20 11:00 +0100
                Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-20 15:00 +0100
                Re: [PATCH] cpufreq: schedutil: govern how frequently we change frequency with rate_limit "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-20 16:00 +0100
    Re: [PATCH] cpufreq: schedutil: govern how frequently we change  frequency with rate_limit Viresh Kumar <viresh.kumar@linaro.org> - 2017-02-16 07:30 +0100

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