linux-kernel - Re: [RFC PATCH v4 09/12] sched/fair: Introduce an energy estimation helper function

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Message-ID: <20180706155056.GP2494@hirez.programming.kicks-ass.net>
Date:   Fri, 6 Jul 2018 17:50:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     rjw@...ysocki.net, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
        mingo@...hat.com, dietmar.eggemann@....com,
        morten.rasmussen@....com, chris.redpath@....com,
        patrick.bellasi@....com, valentin.schneider@....com,
        vincent.guittot@...aro.org, thara.gopinath@...aro.org,
        viresh.kumar@...aro.org, tkjos@...gle.com, joel@...lfernandes.org,
        smuckle@...gle.com, adharmap@...cinc.com, skannan@...cinc.com,
        pkondeti@...eaurora.org, juri.lelli@...hat.com,
        edubezval@...il.com, srinivas.pandruvada@...ux.intel.com,
        currojerez@...eup.net, javi.merino@...nel.org
Subject: Re: [RFC PATCH v4 09/12] sched/fair: Introduce an energy estimation
 helper function

On Fri, Jul 06, 2018 at 04:12:12PM +0100, Quentin Perret wrote:

> I guess it is also worth mentioning that in the case mentioned above the
> scheduling decisions made inside one root domain can indirectly be
> impacted by the scheduling decisions made in another root domain. Some
> CPUs inside one root domain might look expensive to use simply because
> they run at a high OPP because of other CPUs of the same FD being
> over-used in another root domain.

That's simply how it is. There's nothing you can do about it, they share
a clock, teh end.