linux-kernel - Re: [PATCH v7 01/15] sched/core: uclamp: Add CPU's clamp buckets refcounting

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Message-ID: <20190313152831.aqkvdrdoffiyu5pp@e110439-lin>
Date:   Wed, 13 Mar 2019 15:28:31 +0000
From:   Patrick Bellasi <patrick.bellasi@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-api@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Tejun Heo <tj@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Paul Turner <pjt@...gle.com>,
        Quentin Perret <quentin.perret@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Todd Kjos <tkjos@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Steve Muckle <smuckle@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>
Subject: Re: [PATCH v7 01/15] sched/core: uclamp: Add CPU's clamp buckets
 refcounting

On 13-Mar 15:06, Peter Zijlstra wrote:
> On Fri, Feb 08, 2019 at 10:05:40AM +0000, Patrick Bellasi wrote:
> > +static void __init init_uclamp(void)
> > +{
> > +	unsigned int clamp_id;
> > +	int cpu;
> > +
> > +	for_each_possible_cpu(cpu)
> > +		memset(&cpu_rq(cpu)->uclamp, 0, sizeof(struct uclamp_rq));
> > +
> 
> Is that really needed? Doesn't rq come from .bss ?

Will check better... I've just assumed not since in sched_init() we
already have tons of rq's related zero initializations.

-- 
#include <best/regards.h>

Patrick Bellasi