linux-kernel - Re: [PATCH v10 2/9] cpuset: Add new v2 cpuset.sched.domain

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Message-ID: <20180621092728.GV2494@hirez.programming.kicks-ass.net>
Date:   Thu, 21 Jun 2018 11:27:28 +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 v10 2/9] cpuset: Add new v2 cpuset.sched.domain_root flag

On Thu, Jun 21, 2018 at 03:58:06PM +0800, Waiman Long wrote:
> On 06/20/2018 10:27 PM, Peter Zijlstra wrote:
> > On Mon, Jun 18, 2018 at 12:14:01PM +0800, Waiman Long wrote:
> >> +  cpuset.sched.domain_root
> > Why are we calling this a domain_root and not a partition?
> 
> A partition can consist of several cgroups in a tree structure. That
> flag should only be set at the root of a partition. I will change the
> name to partition_root if you think this name is acceptable.

The flag indicates the 'effective_cpus' things of the current group is a
partition. The fact that it can have sub-partitions doesn't really
matter does it.

Just call it 'partition', leave out the whole root stuff, all of cgroup
is hierarchical and you can have sub-groups we don't go around calling
everything a root.