linux-kernel - Re: [PATCH v3 4/4] sched/fair: Add document for burstable CFS bandwidth control

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Message-ID: <YEjG5wNgTzjRLEOL@hirez.programming.kicks-ass.net>
Date:   Wed, 10 Mar 2021 14:17:27 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Huaixin Chang <changhuaixin@...ux.alibaba.com>
Cc:     bsegall@...gle.com, dietmar.eggemann@....com,
        juri.lelli@...hat.com, khlebnikov@...dex-team.ru,
        linux-kernel@...r.kernel.org, mgorman@...e.de, mingo@...hat.com,
        pauld@...head.com, pjt@...gle.com, rostedt@...dmis.org,
        shanpeic@...ux.alibaba.com, vincent.guittot@...aro.org,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH v3 4/4] sched/fair: Add document for burstable CFS
 bandwidth control

On Thu, Jan 21, 2021 at 07:04:53PM +0800, Huaixin Chang wrote:
> Basic description of usage and effect for CFS Bandwidth Control Burst.
> 
> Signed-off-by: Huaixin Chang <changhuaixin@...ux.alibaba.com>
> Signed-off-by: Shanpei Chen <shanpeic@...ux.alibaba.com>

Guess :-)

> +Sometimes users might want a group to burst without accumulation. This is
> +tunable via::
> +       /proc/sys/kernel/sched_cfs_bw_burst_onset_percent (default=0)
> +
> +Up to 100% runtime of cpu.cfs_burst_us might be given on setting bandwidth.

Sometimes is a very crap reason for code to exist. Also, everything is
in _us, why do we have this one thing as a percent?