linux-kernel - Re: [PATCH v6 1/3] sched/fair: Introduce the burstable CFS controller

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Date:   Wed, 23 Jun 2021 10:47:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Odin Ugedal <odin@...d.al>
Cc:     Huaixin Chang <changhuaixin@...ux.alibaba.com>,
        luca.abeni@...tannapisa.it, anderson@...unc.edu, baruah@...tl.edu,
        Benjamin Segall <bsegall@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        dtcccc@...ux.alibaba.com, Juri Lelli <juri.lelli@...hat.com>,
        khlebnikov@...dex-team.ru,
        open list <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...hat.com>,
        pauld@...head.com, Paul Turner <pjt@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Shanpei Chen <shanpeic@...ux.alibaba.com>,
        Tejun Heo <tj@...nel.org>, tommaso.cucinotta@...tannapisa.it,
        Vincent Guittot <vincent.guittot@...aro.org>,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH v6 1/3] sched/fair: Introduce the burstable CFS controller

On Tue, Jun 22, 2021 at 05:27:30PM +0200, Odin Ugedal wrote:

> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index bfaa6e1f6067..ab809bd11785 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -5277,6 +5277,7 @@ static enum hrtimer_restart
> sched_cfs_period_timer(struct hrtimer *timer)
>                         if (new < max_cfs_quota_period) {
>                                 cfs_b->period = ns_to_ktime(new);
>                                 cfs_b->quota *= 2;
> +                               cfs_b->burst *= 2;
> 
>                                 pr_warn_ratelimited(
>         "cfs_period_timer[cpu%d]: period too short, scaling up (new
> cfs_period_us = %lld, cfs_quota_us = %lld)\n",

Thanks, folded that.