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

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Date:   Fri, 29 May 2020 17:02:10 +0100
From:   Mel Gorman <mgorman@...e.de>
To:     Qais Yousef <qais.yousef@....com>
Cc:     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>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....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>,
        Patrick Bellasi <patrick.bellasi@...bug.net>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/2] sched/uclamp: Add a new sysctl to control RT default
 boost value

On Fri, May 29, 2020 at 04:11:18PM +0100, Qais Yousef wrote:
> > Elsewhere in the thread, I showed some results based on 5.7 so uclamp
> > task group existed but I had it disabled. The uclamp related parts of
> > the kconfig were
> > 
> > # zgrep UCLAMP kconfig-5.7.0-rc7-with-clamp.txt.gz
> > CONFIG_UCLAMP_TASK=y
> > CONFIG_UCLAMP_BUCKETS_COUNT=5
> > # CONFIG_UCLAMP_TASK_GROUP is not set
> 
> So you never had the TASK_GROUP part enabled when you noticed the regression?

Correct.

> Or is it the other way around, you just disabled CONFIG_UCLAMP_TASK_GROUP to
> 'fix' it?
> 

I disabled CONFIG_UCLAMP_TASK to "fix" it.

-- 
Mel Gorman
SUSE Labs