linux-kernel - Re: [PATCH v3 6/6] cpufreq: schedutil: ignore sugov kthreads

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Message-ID: <20171130161220.GK9903@localhost.localdomain>
Date:   Thu, 30 Nov 2017 17:12:20 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Todd Kjos <tkjos@...roid.com>,
        Joel Fernandes <joelaf@...gle.com>
Subject: Re: [PATCH v3 6/6] cpufreq: schedutil: ignore sugov kthreads

On 30/11/17 16:02, Patrick Bellasi wrote:
> On 30-Nov 14:41, Juri Lelli wrote:

[...]

> > If the DL changes (which I shall post again as soon as tip/sched/core is
> > bumped up to 4.15-rc1) get in first, this is going to be useless (as the
> > DL kthread gets ignored by the scheduling class itself). But, this looks
> > good to me "in the meantime".
> 
> Just to better understand, you mean that the DL kthread does not send
> out schedutil updates?

It doesn't have a "proper" bandwidth (utilization) :/. So it gets
"unnoticed" and schedutil updates are not triggered.

> 
> If that's the case I agree we can discard this patch... that's also
> one of the reasons why I move it at the end of this series.

Not sure about this though, not my call :). I guess this still helps
until we get the DL changes in.

Best,

Juri