linux-kernel - Re: [RFD PATCH 4/5] sched/cpufreq_schedutil: always consider all CPUs when deciding next freq

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Message-ID: <2348394.hDdCk9fbgK@aspire.rjw.lan>
Date:   Thu, 30 Mar 2017 00:41:36 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Juri Lelli <juri.lelli@....com>
Cc:     peterz@...radead.org, mingo@...hat.com, viresh.kumar@...aro.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        tglx@...utronix.de, vincent.guittot@...aro.org,
        rostedt@...dmis.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, tkjos@...roid.com,
        joelaf@...gle.com, andresoportus@...gle.com,
        morten.rasmussen@....com, dietmar.eggemann@....com,
        patrick.bellasi@....com, Ingo Molnar <mingo@...nel.org>
Subject: Re: [RFD PATCH 4/5] sched/cpufreq_schedutil: always consider all CPUs when deciding next freq

On Friday, March 24, 2017 02:08:59 PM Juri Lelli wrote:
> No assumption can be made upon the rate at which frequency updates get
> triggered, as there are scheduling policies (like SCHED_DEADLINE) which
> don't trigger them so frequently.
> 
> Remove such assumption from the code.

But the util/max values for idle CPUs may be stale, no?

Thanks,
Rafael