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

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Message-ID: <20180709160752.GB17598@e108498-lin.cambridge.arm.com>
Date:   Mon, 9 Jul 2018 17:07:52 +0100
From:   Quentin Perret <quentin.perret@....com>
To:     Peter Zijlstra <peterz@...radead.org>
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 Monday 09 Jul 2018 at 17:42:26 (+0200), Peter Zijlstra wrote:
> On Mon, Jul 09, 2018 at 04:28:26PM +0100, Quentin Perret wrote:
> > What about moving schedutil_freq_util() to sched.h and give it a more
> > generic name (total_cpu_util() ?) with no dependencies on
> > CONFIG_CPU_FREQ_GOV_SCHEDUTIL ? Also, 'energy_util' would have to be
> > renamed I guess (busy_time_util ?).
> 
> Bit big for an inline,

True, but that will be used in the wake-up path ...

> and I don't think there's much point using all
> this without schedutil.

For that total_cpu_util() function I was suggesting, the main point
would be to avoid code duplication with scale_rt_capacity(). Not sure
if that matters ?

Thanks,
Quentin