linux-kernel - Re: [PATCH v5 2/3] sched/fair: Add cfs bandwidth burst statistics

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Message-ID: <YKaXGpMIjJTwF9Ce@slm.duckdns.org>
Date:   Thu, 20 May 2021 13:06:34 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Huaixin Chang <changhuaixin@...ux.alibaba.com>
Cc:     bsegall@...gle.com, dietmar.eggemann@....com,
        dtcccc@...ux.alibaba.com, juri.lelli@...hat.com,
        khlebnikov@...dex-team.ru, linux-kernel@...r.kernel.org,
        mgorman@...e.de, mingo@...hat.com, odin@...d.al, odin@...dal.com,
        pauld@...head.com, peterz@...radead.org, pjt@...gle.com,
        rostedt@...dmis.org, shanpeic@...ux.alibaba.com,
        vincent.guittot@...aro.org, xiyou.wangcong@...il.com
Subject: Re: [PATCH v5 2/3] sched/fair: Add cfs bandwidth burst statistics

On Thu, May 20, 2021 at 08:34:18PM +0800, Huaixin Chang wrote:
> When using cfs_b and meeting with some throttled periods, users shall
> use burst buffer to allow bursty workloads. Apart from configuring some
> burst buffer and watch whether throttled periods disappears, some
> statistics on burst buffer using are also helpful. Thus expose the
> following statistics into cpu.stat file:
> 
> nr_burst:   number of periods bandwidth burst occurs

nr_bursts

> burst_time: cumulative wall-time that any cpus has
> 	    used above quota in respective periods

burst_usec may be more in line with other fields in that file.

Thanks.

-- 
tejun