linux-kernel - Re: [PATCH v5 2/2] cpuset: Add cpuset.flags control knob to v2

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Date:   Mon, 19 Mar 2018 12:33:14 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     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,
        efault@....de, torvalds@...ux-foundation.org,
        Roman Gushchin <guro@...com>
Subject: Re: [PATCH v5 2/2] cpuset: Add cpuset.flags control knob to v2

On 03/19/2018 12:26 PM, Tejun Heo wrote:
> Hello, Waiman.
>
> On Thu, Mar 15, 2018 at 05:20:42PM -0400, Waiman Long wrote:
>> +	The currently supported flag is:
>> +
>> +	  sched_load_balance
>> +		When it is not set, there will be no load balancing
>> +		among CPUs on this cpuset.  Tasks will stay in the
>> +		CPUs they are running on and will not be moved to
>> +		other CPUs.
>> +
>> +		When it is set, tasks within this cpuset will be
>> +		load-balanced by the kernel scheduler.  Tasks will be
>> +		moved from CPUs with high load to other CPUs within
>> +		the same cpuset with less load periodically.
> Hmm... looks like this is something which can be decided by the cgroup
> itself and should be made delegatable.  Given that different flags
> might need different delegation settings and the precedence of
> memory.oom_group, I think it'd be better to make the flags separate
> bool files - ie. cpuset.sched_load_balance which contains 0/1 and
> marked delegatable.
>
> Thanks.
>
Sure. Will do that.

-Longman