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From:   Vincent Guittot <vincent.guittot@linaro.org>
Date:   Wed, 24 Jun 2020 10:45:01 +0200
Message-ID: <CAKfTPtBfFkmBRP+6vZaX9sEK+4ABpJrp2qZj18LKzu2t+Q=gGQ@mail.gmail.com>
Subject: Re: [PATCH 1/2] sched/uclamp: Add a new sysctl to control RT default
 boost value
To:     Qais Yousef <qais.yousef@arm.com>
Cc:     Mel Gorman <mgorman@suse.de>,
        Patrick Bellasi <patrick.bellasi@matbug.net>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Juri Lelli <juri.lelli@redhat.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Iurii Zaikin <yzaikin@google.com>,
        Quentin Perret <qperret@google.com>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Pavan Kondeti <pkondeti@codeaurora.org>,
        linux-doc@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-fs <linux-fsdevel@vger.kernel.org>
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Hi Qais,

On Tue, 23 Jun 2020 at 17:44, Qais Yousef <qais.yousef@arm.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@arm.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