linux-kernel - Re: [PATCH RFC 4/8] sched/cpufreq_schedutil: split utilization signals

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Date:   Tue, 23 May 2017 21:29:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@....com>
Cc:     mingo@...hat.com, rjw@...ysocki.net, viresh.kumar@...aro.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        tglx@...utronix.de, vincent.guittot@...aro.org,
        rostedt@...dmis.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, tkjos@...roid.com,
        joelaf@...gle.com, andresoportus@...gle.com,
        morten.rasmussen@....com, dietmar.eggemann@....com,
        patrick.bellasi@....com, Ingo Molnar <mingo@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH RFC 4/8] sched/cpufreq_schedutil: split utilization
 signals

On Tue, May 23, 2017 at 09:53:47AM +0100, Juri Lelli wrote:
> To be able to treat utilization signals of different scheduling classes
> in different ways (e.g., CFS signal might be stale while DEADLINE signal
> is never stale by design) we need to split sugov_cpu::util signal in two:
> util_cfs and util_dl.
> 
> This patch does that by also changing sugov_get_util() parameter list.
> After this change aggregation of the different signals has to be performed
> by sugov_get_util() users (so that they can decide what to do with the
> different signals).

So what I don't see this patch doing; and I don't remember if cpufreq is
ready for this at all, is set the util_dl as min/guaranteed freq and
util_cfs+util_dl as requested freq.