linux-kernel - Re: [PATCH 3/4] sched: cpufreq: Move apply_dvfs

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Message-ID: <a7699065-6c56-62f3-50a6-a939ff192420@arm.com>
Date:   Mon, 21 Aug 2023 18:40:15 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Qais Yousef <qyousef@...alina.io>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Lukasz Luba <lukasz.luba@....com>
Subject: Re: [PATCH 3/4] sched: cpufreq: Move apply_dvfs_headroom() to sched.h

On 20/08/2023 23:06, Qais Yousef wrote:
> This function relies on updating util signal appropriately to give
> a headroom to grow. This is more of a scheduler functionality than
> cpufreq. Move it to sched.h where all the other util handling code
> belongs.

To me map_util_freq() is the power counterpart to fits_capacity()
[fair.c] which is used in schedutil (cpufreq) and EM to do the same*
thing as EAS in the task scheduler (fair.c).

* With the already (PATCH 1/4) mentioned difference that EAS deals with
`util_cfs` vs `capacity` whereas power deals with `util` vs `capacity_orig`.

[...]