linux-kernel - Re: [PATCH 1/2] sched/uclamp: Add a new sysctl to control RT default boost value

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Date:   Wed, 24 Jun 2020 10:45:01 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Mel Gorman <mgorman@...e.de>,
        Patrick Bellasi <patrick.bellasi@...bug.net>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Jonathan Corbet <corbet@....net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Quentin Perret <qperret@...gle.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        linux-doc@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fs <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched/uclamp: Add a new sysctl to control RT default
 boost value

Hi Qais,

On Tue, 23 Jun 2020 at 17:44, Qais Yousef <qais.yousef@....com> wrote:
>
> Hi Vincent
>
> On 06/11/20 14:01, Vincent Guittot wrote:
> > On Thu, 11 Jun 2020 at 12:24, Qais Yousef <qais.yousef@....com> wrote:
>
> [...]
>
> > > > Strange because I have been able to trace them.
> > >
> > > On your arm platform? I can certainly see them on x86.
> >
> > yes on my arm platform
>
> Sorry for not getting back to you earlier but I have tried several things and
> shared my results, which you were CCed into all of them.
>
> I have posted a patch that protects uclamp with a static key, mind trying it on
> your platform to see if it helps you too?

I have run some tests with your latest patchset and will reply to the
email thread below

>
> https://lore.kernel.org/lkml/20200619172011.5810-1-qais.yousef@arm.com/
>
> Thanks
>
> --
> Qais Yousef