linux-kernel - Re: [RFC PATCH v4 03/12] PM: Introduce an Energy Model management framework

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Message-ID: <20180706100647.GB11862@e108498-lin.cambridge.arm.com>
Date:   Fri, 6 Jul 2018 11:06:47 +0100
From:   Quentin Perret <quentin.perret@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Chris Redpath <chris.redpath@....com>,
        Patrick Bellasi <patrick.bellasi@....com>,
        Valentin Schneider <valentin.schneider@....com>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        viresh kumar <viresh.kumar@...aro.org>,
        Todd Kjos <tkjos@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        "Cc: Steve Muckle" <smuckle@...gle.com>, adharmap@...cinc.com,
        "Kannan, Saravana" <skannan@...cinc.com>, pkondeti@...eaurora.org,
        Juri Lelli <juri.lelli@...hat.com>,
        Eduardo Valentin <edubezval@...il.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        currojerez@...eup.net, Javi Merino <javi.merino@...nel.org>
Subject: Re: [RFC PATCH v4 03/12] PM: Introduce an Energy Model management
 framework

On Friday 06 Jul 2018 at 12:03:53 (+0200), Peter Zijlstra wrote:
> On Fri, Jul 06, 2018 at 11:57:37AM +0200, Vincent Guittot wrote:
> > 
> > IIUC the formula above, you consider that all CPUs in a frequency
> > domain has the same capacity. This sounds a reasonable assumption but
> > it would be good to write that somewhere
> 
> Yes, I think there used to be a WARN and kill EM for that, but I cannot
> seem to locate that in the current code.

There is something if the EM is too complex to be used by the scheduler.
But nothing about that assumption (yet).

I'll fix that in v5

Thanks,
Quentin