linux-kernel - Re: [PATCH v8 06/16] sched/core: uclamp: Extend sched_setattr() to support utilization clamping

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Date:   Thu, 9 May 2019 10:24:42 +0100
From:   Patrick Bellasi <patrick.bellasi@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Suren Baghdasaryan <surenb@...gle.com>,
        LKML <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>
Subject: Re: [PATCH v8 06/16] sched/core: uclamp: Extend sched_setattr() to
 support utilization clamping

On 08-May 21:44, Peter Zijlstra wrote:
> On Tue, May 07, 2019 at 12:13:47PM +0100, Patrick Bellasi wrote:
> > On 17-Apr 15:26, Suren Baghdasaryan wrote:
> > > On Tue, Apr 2, 2019 at 3:42 AM Patrick Bellasi <patrick.bellasi@....com> wrote:
> 
> > > > @@ -1056,6 +1100,13 @@ static void __init init_uclamp(void)
> > > >  #else /* CONFIG_UCLAMP_TASK */
> > > >  static inline void uclamp_rq_inc(struct rq *rq, struct task_struct *p) { }
> > > >  static inline void uclamp_rq_dec(struct rq *rq, struct task_struct *p) { }
> > > > +static inline int uclamp_validate(struct task_struct *p,
> > > > +                                 const struct sched_attr *attr)
> > > > +{
> > > > +       return -ENODEV;
> > > 
> > > ENOSYS might be more appropriate?
> > 
> > Yep, agree, thanks!
> 
> No, -ENOSYS (see the comment) is special in that it indicates the whole
> system call is unavailable; that is most certainly not the case!

Yep, noted. Thanks.

-- 
#include <best/regards.h>

Patrick Bellasi