linux-kernel - Re: [PATCH V3 1/2] sched/core: Rename and move schedutil_cpu

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Message-ID: <20201123100455.ulpoje32hhrmskou@vireshk-i7>
Date:   Mon, 23 Nov 2020 15:34:55 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Quentin Perret <qperret@...gle.com>,
        Lukasz Luba <lukasz.luba@....com>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH V3 1/2] sched/core: Rename and move schedutil_cpu_util()
 to core.c

On 19-11-20, 13:30, Rafael J. Wysocki wrote:
> On Thu, Nov 19, 2020 at 8:38 AM Viresh Kumar <viresh.kumar@...aro.org> wrote:
> >
> > There is nothing schedutil specific in schedutil_cpu_util(), move it to
> > core.c and rename it to sched_cpu_util(), so it can be used from other
> > parts of the kernel as well.
> 
> The patch does more than this, though.
> 
> I would do that in two patches: (1) move the function as is and (2)
> rename it and rearrange the users.

Sure.

> >  static unsigned long sugov_get_util(struct sugov_cpu *sg_cpu)
> >  {
> > -       struct rq *rq = cpu_rq(sg_cpu->cpu);
> > -       unsigned long util = cpu_util_cfs(rq);
> > -       unsigned long max = arch_scale_cpu_capacity(sg_cpu->cpu);
> > -
> > -       sg_cpu->max = max;
> > -       sg_cpu->bw_dl = cpu_bw_dl(rq);
> > +       sg_cpu->max = arch_scale_cpu_capacity(sg_cpu->cpu);
> > +       sg_cpu->bw_dl = cpu_bw_dl(cpu_rq(sg_cpu->cpu));
> >
> > -       return schedutil_cpu_util(sg_cpu->cpu, util, max, FREQUENCY_UTIL, NULL);
> > +       return sched_cpu_util(sg_cpu->cpu, FREQUENCY_UTIL, sg_cpu->max);
> 
> I don't see much value in using this wrapper here TBH and it
> introduces an otherwise redundant cpu_rq() computation.

You want to call effective_cpu_util() here instead, right ?

-- 
viresh