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Date:   Fri, 20 Nov 2020 09:27:24 +0000
From:   Quentin Perret <>
To:     Viresh Kumar <>
Cc:     Peter Zijlstra <>,
        "Rafael J. Wysocki" <>,
        Ingo Molnar <>,
        Thomas Gleixner <>,
        Vincent Guittot <>,
        Morten Rasmussen <>,,,,,,
Subject: Re: [RFC] Documentation/scheduler/schedutil.txt

On Friday 20 Nov 2020 at 14:49:04 (+0530), Viresh Kumar wrote:
>     This is unlikely to be an issue on systems where cpufreq policies are
>     shared between multiple CPUs, because in those cases the policy
>     utilization is computed as the maximum of the CPU utilization values
>     over the whole policy and if that turns out to be low, reducing the
>     frequency for the policy most likely is a good idea anyway.

Hmm, I'm not sure I agree with this actually. We may be migrating the
task to a different policy altogether. And even if we migrate to another
CPU in the current policy, the task util_avg may be small just because
it was packed with other tasks on a rq, which means it may not increase
the util of the destination rq by much.

ISTR Douglas' EM-based schedutil boosting series was addressing that at
some point, I'll go have a look back at that discussion...

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