linux-kernel - Re: [PATCH v3] sched: async unthrottling for cfs bandwidth

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Date:   Tue, 22 Nov 2022 13:55:53 +0800
From:   Aaron Lu <aaron.lu@...el.com>
To:     Josh Don <joshdon@...gle.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        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>,
        "Mel Gorman" <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
        Michal Koutný <mkoutny@...e.com>,
        Christian Brauner <brauner@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>
Subject: Re: [PATCH v3] sched: async unthrottling for cfs bandwidth

On Mon, Nov 21, 2022 at 11:31:20AM -0800, Josh Don wrote:
> > Please test the final version as found here:
> >
> >   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=sched/core&id=4e3c1b7b489e218dfa576cd6af0680b975b8743e
> 
> Thanks Peter, the patch looks good to me and continues to work
> correctly. Note that I needed to make two edits to get it to build
> though on sched/core:
> 
> - local_cfq_rq doesn't match variable name used in function (local_unthrottle)
> - rq_lock_irqrestore -> rq_unlock_irqrestore

I also tested it on a desktop bare metal with 800 cgroups under 2
cgroups that have quota set. Before this patch, the majority of durations
for sched_cfs_period_timer() are in the range of 512us-1ms, with outliers
in the range of 1ms-4ms; after this patch, the majority are in the range
of 128us-512us with no outliers above 512us.