linux-kernel - Re: [PATCH v4 0/4] Clarify abstract scale usage for power values in Energy Model, EAS and IPA

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Date:   Tue, 10 Nov 2020 20:32:21 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Dietmar Eggemann <Dietmar.Eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Quentin Perret <qperret@...gle.com>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        "Nayak, Rajendra" <rnayak@...eaurora.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>
Subject: Re: [PATCH v4 0/4] Clarify abstract scale usage for power values in
 Energy Model, EAS and IPA

On Wed, Nov 4, 2020 at 11:58 AM Lukasz Luba <lukasz.luba@....com> wrote:
>
> Hi Rafael,
>
> On 11/3/20 9:05 AM, Lukasz Luba wrote:
> > Hi all,
> >
> > The Energy Model supports power values expressed in an abstract scale.
> > This has an impact on Intelligent Power Allocation (IPA) and should be
> > documented properly. Kernel sub-systems like EAS, IPA and DTPM
> > (new comming PowerCap framework) would use the new flag to capture
> > potential miss-configuration where the devices have registered different
> > power scales, thus cannot operate together.
> >
> > There was a discussion below v2 of this patch series, which might help
> > you to get context of these changes [2].
> >
> > The agreed approach is to have the DT as a source of power values expressed
> > always in milli-Watts and the only way to submit with abstract scale values
> > is via the em_dev_register_perf_domain() API.
> >
> > Changes:
> > v4:
> > - change bool to int type for 'miliwatts' in struct em_perf_domain
> >    (suggested by Quentin)
> > - removed one sentence from patch 2/4 in IPA doc power_allocator.rst
> >    (suggested by Quentin)
> > - added reviewed-by from Quentin to 1/4, 3/4, 4/4 patches
>
> There was no major objections in the v3 and this v4 just addressed
> minor comments. The important discussions mostly happen in v2.
>
> Could you take the patches via your tree, please?

Applied as 5.11 material, thanks!