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

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Message-ID: <20180706100353.GU2476@hirez.programming.kicks-ass.net>
Date:   Fri, 6 Jul 2018 12:03:53 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Quentin Perret <quentin.perret@....com>,
        "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 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.