linux-kernel - Re: [PATCH v11 1/5] sched/core: uclamp: Extend CPU's cgroup controller

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Message-ID: <20190718152327.vmnds3kpagh2xz2r@e110439-lin>
Date:   Thu, 18 Jul 2019 16:26:22 +0100
From:   Patrick Bellasi <patrick.bellasi@....com>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.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 1/5] sched/core: uclamp: Extend CPU's cgroup
 controller

On 18-Jul 07:52, Tejun Heo wrote:
> Hello, Patrick.
> 
> On Mon, Jul 08, 2019 at 09:43:53AM +0100, Patrick Bellasi wrote:
> > +static inline void cpu_uclamp_print(struct seq_file *sf,
> > +				    enum uclamp_id clamp_id)
> > +{
> > +	struct task_group *tg;
> > +	u64 util_clamp;
> > +	u64 percent;
> > +	u32 rem;
> > +
> > +	rcu_read_lock();
> > +	tg = css_tg(seq_css(sf));
> > +	util_clamp = tg->uclamp_req[clamp_id].value;
> > +	rcu_read_unlock();
> > +
> > +	if (util_clamp == SCHED_CAPACITY_SCALE) {
> > +		seq_puts(sf, "max\n");
> > +		return;
> > +	}
> > +
> > +	percent = uclamp_percent_from_scale(util_clamp);
> > +	percent = div_u64_rem(percent, 100, &rem);
> > +	seq_printf(sf, "%llu.%u\n", percent, rem);
> 
> "%llu.%02u" otherwise 20.01 gets printed as 20.1

Yup!... good point! :)

Since we already collected many feedbacks, I've got a v12 ready for posting.
Maybe you better wait for that before going on with the review.

Thanks,
Patrick

-- 
#include <best/regards.h>

Patrick Bellasi