linux-kernel - Re: [RFC PATCH] sched: introduce group balancer

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Message-ID: <Yd/2aRcQlxm3Sh41@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Jan 2022 10:52:41 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     王贇 <yun.wang@...ux.alibaba.com>
Cc:     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>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Chris Down <chris@...isdown.name>,
        Vipin Sharma <vipinsh@...gle.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Daniel Borkmann <daniel@...earbox.net>,
        Arnd Bergmann <arnd@...db.de>,
        Cruz Zhao <cruzzhao@...ux.alibaba.com>,
        Tianchen Ding <dtcccc@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: Re: [RFC PATCH] sched: introduce group balancer

On Thu, Jan 13, 2022 at 03:18:01PM +0800, 王贇 wrote:

> > > How To Use:
> > > 
> > > To create partition, for example run:
> > >    echo disable > /proc/gb_ctrl
> > >    echo "0-15;16-31;32-47;48-63;" > /proc/gb_ctrl
> > >    echo enable > /proc/gb_ctrl
> > 
> > That's just never going to happen; please look at the cpuset partition
> > stuff.
> 
> Could you please give more details in here?
> 
> We actually looking forward a way to config several cpuset partition
> together, like here 4 cpuset partitions 0-15, 16-31, 32-47 and 48-63,
> but can't find any existing approach...

You could extend the partitions support:

 https://lkml.kernel.org/r/20211205183220.818872-1-longman@redhat.com

And have a parent partition type that soft balances between child
partitions or something.