linux-kernel - Re: [PATCH v3 1/2] sched/uclamp: Add a new sysctl to control RT default boost value

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Date:   Wed, 29 Apr 2020 16:40:57 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Pavan Kondeti <pkondeti@...eaurora.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        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>,
        Patrick Bellasi <patrick.bellasi@...bug.net>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] sched/uclamp: Add a new sysctl to control RT
 default boost value

On 04/29/20 20:51, Pavan Kondeti wrote:
> As we are copying the sysctl_sched_uclamp_util_min_rt_default value into
> p->uclamp_req[UCLAMP_MIN], user gets it when sched_getattr() is called though
> sched_setattr() was not called before. I guess that is expected behavior with
> your definition of this new tunable. Thanks for answering the question in
> detail.

Yes. That's the original design without this patch actually. Though before it
was always set to 1024.

Thanks for having a look!

--
Qais Yousef