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

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Date:   Fri, 20 Jul 2018 13:09:23 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
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 v11 7/9] cpuset: Expose cpus.effective and mems.effective
 on cgroup v2 root

On 07/20/2018 12:37 PM, Peter Zijlstra wrote:
> On Fri, Jul 20, 2018 at 12:19:29PM -0400, Waiman Long wrote:
>> I am not against the idea of making it hierarchical eventually. I am
>> just hoping to get thing going by merging the patchset in its current
>> form and then we can make it hierarchical in a followup patch.
> Where's the rush? Why can't we do this right in one go?

For me, the rush comes from RHEL8 as it is a goal to have a fully
functioning cgroup v2 in that release.

I also believe that most of the use cases of partition can be satisfied
with partitions at the first level children. Getting hierarchical
partition right may drag on for half a year, maybe, giving our history
with cpu v2 controller. No matter what we do to enable hierarchical
partition in the future, the current model of using a partition flag is
intuitive enough that it won't be changed at least for the first level
children.

Cheers,
Longman