linux-kernel - Re: [PATCH v9 3/7] cpuset: Add cpuset.sched.load

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Date:   Thu, 31 May 2018 12:44:13 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        kernel-team@...com, pjt@...gle.com, luto@...capital.net,
        Mike Galbraith <efault@....de>, torvalds@...ux-foundation.org,
        Roman Gushchin <guro@...com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Patrick Bellasi <patrick.bellasi@....com>
Subject: Re: [PATCH v9 3/7] cpuset: Add cpuset.sched.load_balance flag to v2

On Tue, May 29, 2018 at 09:41:30AM -0400, Waiman Long wrote:
> diff --git a/Documentation/cgroup-v2.txt b/Documentation/cgroup-v2.txt
> index e7534c5..681a809 100644
> --- a/Documentation/cgroup-v2.txt
> +++ b/Documentation/cgroup-v2.txt
> @@ -1542,6 +1542,32 @@ Cpuset Interface Files
>  	Further changes made to "cpuset.cpus" is allowed as long as
>  	the first condition above is still true.
>  
> +	A parent scheduling domain root cgroup cannot distribute all
> +	its CPUs to its child scheduling domain root cgroups

This I think wants to be in the previous patch

>                                                            unless
> +	its load balancing flag is turned off.

And this is indeed for here.