linux-kernel - Re: [RFD PATCH 3/5] sched/cpufreq_schedutil: make worker kthread be SCHED

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Message-ID: <cfffdfdd5251ae7921f65d1e0360a289@codeaurora.org>
Date:   Thu, 30 Mar 2017 08:50:11 -0700
From:   Vikram Mulukutla <markivx@...eaurora.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Juri Lelli <juri.lelli@....com>,
        Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, tglx@...utronix.de,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        luca.abeni@...tannapisa.it, claudio@...dence.eu.com,
        tommaso.cucinotta@...tannapisa.it, bristot@...hat.com,
        mathieu.poirier@...aro.org, tkjos@...roid.com, joelaf@...gle.com,
        andresoportus@...gle.com, morten.rasmussen@....com,
        dietmar.eggemann@....com, patrick.bellasi@....com,
        Ingo Molnar <mingo@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Mark Brown <broonie@...nel.org>,
        linux-kernel-owner@...r.kernel.org
Subject: Re: [RFD PATCH 3/5] sched/cpufreq_schedutil: make worker kthread be
 SCHED_DEADLINE



> OK
> 
> So there are two pieces here.
> 
> One is that if we want *all* drivers to work with schedutil, we need to 
> keep
> the kthread for the ones that will never be reworked (because nobody 
> cares
> etc).  But then perhaps the kthread implementation may be left alone 
> (because
> nobody cares etc).
> 
> The second one is that there are drivers operating in-context that work 
> with
> schedutil already, so I don't see major obstacles to making more 
> drivers work
> that way.  That would be only a matter of reworking the drivers in 
> question.
> 
> Thanks,
> Rafael

There are some MSM platforms that do need a kthread and would love to 
use
schedutil. This is all mainly due to the point that Vincent raised; 
having
to actually wait for voltage transitions before clock switches. I can't
speak about the future, but that's the situation right now. Leaving the
kthread alone for now would be appreciated!

Thanks,
Vikram