linux-kernel - Re: [PATCH v4] cpuset: Enable cpuset controller in default hierarchy

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Message-ID: <55809fe4-98ba-5566-86ed-457acfef0e1c@redhat.com>
Date:   Fri, 9 Mar 2018 13:20:22 -0500
From:   Waiman Long <longman@...hat.com>
To:     Mike Galbraith <efault@....de>, 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>
Cc:     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 v4] cpuset: Enable cpuset controller in default hierarchy

On 03/09/2018 01:17 PM, Mike Galbraith wrote:
> On Fri, 2018-03-09 at 12:45 -0500, Waiman Long wrote:
>> On 03/09/2018 11:34 AM, Mike Galbraith wrote:
>>> On Fri, 2018-03-09 at 10:35 -0500, Waiman Long wrote:
>>>> Given the fact that thread mode had been merged into 4.14, it is now
>>>> time to enable cpuset to be used in the default hierarchy (cgroup v2)
>>>> as it is clearly threaded.
>>>>
>>>> The cpuset controller had experienced feature creep since its
>>>> introduction more than a decade ago. Besides the core cpus and mems
>>>> control files to limit cpus and memory nodes, there are a bunch of
>>>> additional features that can be controlled from the userspace. Some of
>>>> the features are of doubtful usefulness and may not be actively used.
>>> One rather important features is the ability to dynamically partition a
>>> box and isolate critical loads.  How does one do that with v2?
>>>
>>> In v1, you create two or more exclusive sets, one for generic
>>> housekeeping, and one or more for critical load(s), RT in my case,
>>> turning off load balancing in the critical set(s) for obvious reasons.
>> This patch just serves as a foundation for cpuset support in v2. I am
>> not excluding the fact that more v1 features will be added in future
>> patches. We want to start with a clean slate and add on it after careful
>> consideration. There are some v1 cpuset features that are not used or
>> rarely used. We certainly want to get rid of them, if possible.
> If v2 is to ever supersede v1, as is the normal way of things, core
> functionality really should be on the v2 boat when it sails.  What you
> left standing on the dock is critical core cpuset functionality.
>
> 	-Mike

>From your perspective, what are core functionality that should be
included in cpuset v2 other than the ability to restrict cpus and memory
nodes.

Cheers,
Longman