linux-kernel - Re: [PATCH 1/2] sched/fair: Remove SCHED_FEAT(UTIL_EST

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Date:   Fri, 1 Dec 2023 08:42:04 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     Tang Yizhou <yizhou.tang@...pee.com>
Cc:     Hongyan Xia <hongyan.xia2@....com>, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        corbet@....net, alexs@...nel.org, siyanteng@...ngson.cn,
        qyousef@...alina.io, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, lukasz.luba@....com
Subject: Re: [PATCH 1/2] sched/fair: Remove SCHED_FEAT(UTIL_EST_FASTUP, true)

On Fri, 1 Dec 2023 at 03:16, Tang Yizhou <yizhou.tang@...pee.com> wrote:
>
> On Fri, Dec 1, 2023 at 4:30 AM Hongyan Xia <hongyan.xia2@....com> wrote:
> >
> > Here it is in case you have to provide the translation:
> >
> > diff --git a/Documentation/translations/zh_CN/scheduler/schedutil.rst
> > b/Documentation/translations/zh_CN/scheduler/schedutil.rst
> > index d1ea68007520..7c8d87f21c42 100644
> > --- a/Documentation/translations/zh_CN/scheduler/schedutil.rst
> > +++ b/Documentation/translations/zh_CN/scheduler/schedutil.rst
> > @@ -89,16 +89,15 @@
> > r_cpu被定义为当前CPU的最高性能水平与系统中任何其它CPU的最
> >    - Documentation/translations/zh_CN/scheduler/sched-capacity.rst:"1.
> > CPU Capacity + 2. Task utilization"
> >
> >
> > -UTIL_EST / UTIL_EST_FASTUP
> > -==========================
> > +UTIL_EST
> > +========
> >
> >
> > 由于周期性任务的平均数在睡眠时会衰减，而在运行时其预期利用率会和睡眠前相同，
> >   因此它们在再次运行后会面临（DVFS）的上涨。
> >
> >   为了缓解这个问题，（一个默认使能的编译选项）UTIL_EST驱动一个无限脉冲响应
> >   （Infinite Impulse Response，IIR）的EWMA，“运行”值在出队时是最高的。
> > -另一个默认使能的编译选项UTIL_EST_FASTUP修改了IIR滤波器，使其允许立即增加，
> > -仅在利用率下降时衰减。
> > +UTIL_EST滤波使其在遇到更高值时立刻增加，而遇到低值时会缓慢衰减。
> >
>
> Hi Hongyan,
>
> Thanks for your Chinese documentation translation!
>
> For the translation:
> Reviewed-by: Tang Yizhou <yizhou.tang@...pee.com>

Thanks

>
> Thanks,
> Yizhou