linux-kernel - Re: [PATCH v11 3/5] sched/core: uclamp: Propagate system defaults to root group

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Message-ID: <20190715164226.GA30262@blackbody.suse.cz>
Date:   Mon, 15 Jul 2019 18:42:26 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Patrick Bellasi <patrick.bellasi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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>,
        Alessio Balsini <balsini@...roid.com>
Subject: Re: [PATCH v11 3/5] sched/core: uclamp: Propagate system defaults to
 root group

On Mon, Jul 08, 2019 at 09:43:55AM +0100, Patrick Bellasi <patrick.bellasi@....com> wrote:
> +static void uclamp_update_root_tg(void)
> +{
> +	struct task_group *tg = &root_task_group;
> +
> +	uclamp_se_set(&tg->uclamp_req[UCLAMP_MIN],
> +		      sysctl_sched_uclamp_util_min, false);
> +	uclamp_se_set(&tg->uclamp_req[UCLAMP_MAX],
> +		      sysctl_sched_uclamp_util_max, false);
> +
> +	cpu_util_update_eff(&root_task_group.css);
> +}
cpu_util_update_eff internally calls css_for_each_descendant_pre() so
this should be protected with rcu_read_lock().