linux-kernel - Re: [RFC PATCH 0/7] sched: cpufreq: Remove magic margins

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Message-ID: <20230907132631.GF10955@noisy.programming.kicks-ass.net>
Date:   Thu, 7 Sep 2023 15:26:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qais Yousef <qyousef@...alina.io>
Cc:     Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [RFC PATCH 0/7] sched: cpufreq: Remove magic margins

On Wed, Sep 06, 2023 at 10:18:50PM +0100, Qais Yousef wrote:

> This is probably controversial statement. But I am not in favour of util_est.
> I need to collect the data, but I think we're better with 16ms PELT HALFLIFE as
> default instead. But I will need to do a separate investigation on that.

I think util_est makes perfect sense, where PELT has to fundamentally
decay non-running / non-runnable tasks in order to provide a temporal
average, DVFS might be best served with a termporal max filter.