linux-kernel - Re: [PATCH v6 04/11] cpufreq/schedutil: use rt utilization tracking

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Message-ID: <20180622144603.GR2476@hirez.programming.kicks-ass.net>
Date:   Fri, 22 Jun 2018 16:46:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Quentin Perret <quentin.perret@....com>,
        Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <Morten.Rasmussen@....com>,
        viresh kumar <viresh.kumar@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v6 04/11] cpufreq/schedutil: use rt utilization tracking

On Fri, Jun 22, 2018 at 03:57:24PM +0200, Vincent Guittot wrote:
> On Fri, 22 Jun 2018 at 15:54, Vincent Guittot
> <vincent.guittot@...aro.org> wrote:
> > On Fri, 22 Jun 2018 at 15:26, Peter Zijlstra <peterz@...radead.org> wrote:

> > > And that is my objection to that straight sum thing; there the dl util
> > > distorts the computed dl bandwidth thing even if there is no cfs
> > > utilization.
> >
> > hmm,
> 
> forgot to finish this sentence
> 
> hmm, dl util_avg is only used to detect is there is idle time so if
> cfs util is nul we will not distort the  dl bw (for a use case where
> there is no rt task running)

Hurm.. let me apply those patches and read the result, because I think I
missed something.