linux-kernel - Re: [PATCH v11 7/9] cpuset: Expose cpus.effective and mems.effective on cgroup v2 root

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Message-ID: <20180719165201.GU72677@devbig577.frc2.facebook.com>
Date:   Thu, 19 Jul 2018 09:52:01 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.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 v11 7/9] cpuset: Expose cpus.effective and mems.effective
 on cgroup v2 root

Hello,

On Thu, Jul 19, 2018 at 11:52:46AM -0400, Waiman Long wrote:
> BTW, the way the partition is currently implemented right now is that a
> child cannot be a partition root unless its parent is a partition root
> itself. That is to avoid turning on partition to affect ancestors
> further up the hierarchy than just the parent. So in the case of a
> container, it cannot allocate sub-partitions underneath it unless it is
> a partition itself. Will that solve your concern?

Hmm... so a given ancestor must be able to both

1. control which cpus are moved into a partition in all of its
   subtree.

2. take away any given cpu from ist subtree.

Right now, I don't think it's achieving either, right?

Thanks.

-- 
tejun