linux-kernel - Re: [PATCH 2/4] sched: cpufreq: Keep track of cpufreq utilization update flags

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Message-ID: <CAKohpomHfV=2CQj0_D=PsoMvbCu5v_ensJqaZmxUURzr27+yhA@mail.gmail.com>
Date:   Sat, 16 Dec 2017 22:17:07 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Todd Kjos <tkjos@...roid.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] sched: cpufreq: Keep track of cpufreq utilization
 update flags

On 16 December 2017 at 22:10, Rafael J. Wysocki <rafael@...nel.org> wrote:
> On Wed, Dec 13, 2017 at 10:53 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:

>> +#define SCHED_CPUFREQ_CLEAR    (1U << 31)
>
> I'm not thrilled by this, because schedutil is not the only user of
> the flags and it's totally unclear what the other user(s) should do
> when this is set.

intel-pstate is the only other user of the IOWAIT flag, right? In order
not to change the current behavior, we can update that to return early
for now ?

--
viresh