linux-kernel - Re: [PATCH 00/14] Modularize schedutil

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Date:   Tue, 12 May 2020 14:58:13 +0100
From:   Quentin Perret <qperret@...gle.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Benjamin Segall <bsegall@...gle.com>,
        Mel Gorman <mgorman@...e.de>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Todd Kjos <tkjos@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [PATCH 00/14] Modularize schedutil

On Tuesday 12 May 2020 at 12:25:17 (+0200), Rafael J. Wysocki wrote:
> Still, IMO it would be fair to say that if uclamps are used, schedutil
> is very likely to be preferred.
> 
> Kconfig can be made select schedutil when enabling uclamps or similar
> to express that preference.

Right, fair enough. Making schedutil default to y when uclamp is
compiled in should do the trick (and avoid using 'select'). Would that
work for you?

> What you are proposing is basically to add complexity and the reason
> for doing that seems to be convenience (and that's not the users'
> convenience for that matter) which is not really super-convincing.

Forcing our users to build in their products something they don't want
to use tends to be a very real problem for what we're trying to achieve,
so it's certainly not just convenience from our perspective. I can
understand that yours might be different, though.

Thanks,
Quentin