linux-kernel - Re: [PATCH v6 2/2] cpuset: Add cpuset.sched_load

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Date:   Tue, 27 Mar 2018 08:54:12 +0200
From:   Mike Galbraith <efault@....de>
To:     Waiman Long <longman@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>
Cc:     Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.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,
        torvalds@...ux-foundation.org, Roman Gushchin <guro@...com>
Subject: Re: [PATCH v6 2/2] cpuset: Add cpuset.sched_load_balance to v2

On Mon, 2018-03-26 at 16:28 -0400, Waiman Long wrote:
> 
> The sched_load_balance flag isn't something that is passed to the
> scheduler. It only only affects the CPU topology of the system. So I
> suspect that a process in the root cgroup will be load balanced among
> the CPUs in the one of the child cgroups. 

Yes, among CPUs that remain part of topology (and intersect affinity).

> That doesn't look right unless
> we enforce that no process can be in the root cgroup in this case.

caveat: quite a few kthreads are nailed to the floor of root.

	-Mike