linux-kernel - Re: [PATCH] sched/fair: util_est: fast ramp-up EWMA on utilization increases

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Message-ID: <20191014145218.GI2328@hirez.programming.kicks-ass.net>
Date:   Mon, 14 Oct 2019 16:52:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Douglas Raillard <douglas.raillard@....com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>
Subject: Re: [PATCH] sched/fair: util_est: fast ramp-up EWMA on utilization
 increases

The energy aware schedutil patches remimded me this was still pending.

On Fri, Aug 02, 2019 at 10:47:25AM +0100, Patrick Bellasi wrote:
> Hi Peter, Vincent,
> is there anything different I can do on this?

I think both Vincent and me are basically fine with the patch, it was
the Changelog/explanation for it that sat uneasy.

Specifically I think the 'confusion' around the PELT invariance stuff
doesn't help.

I think that if you present it simply as making util_est directly follow
upward motion and only decay on downward -- and the rationale for it --
then it should be fine.