linux-kernel - Re: [PATCH 1/4] numa: introduce per-cgroup numa balancing locality, statistic

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Date:   Fri, 12 Jul 2019 18:10:24 +0800
From:   王贇 <yun.wang@...ux.alibaba.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     hannes@...xchg.org, mhocko@...nel.org, vdavydov.dev@...il.com,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, mcgrof@...nel.org, keescook@...omium.org,
        linux-fsdevel@...r.kernel.org, cgroups@...r.kernel.org,
        Mel Gorman <mgorman@...e.de>, riel@...riel.com
Subject: Re: [PATCH 1/4] numa: introduce per-cgroup numa balancing locality,
 statistic



On 2019/7/12 下午5:42, Peter Zijlstra wrote:
> On Fri, Jul 12, 2019 at 05:11:25PM +0800, 王贇 wrote:
>>
>>
>> On 2019/7/12 下午3:58, Peter Zijlstra wrote:
>> [snip]
>>>>>
>>>>> Then our task t1 should be accounted to B (as you do), but also to A and
>>>>> R.
>>>>
>>>> I get the point but not quite sure about this...
>>>>
>>>> Not like pages there are no hierarchical limitation on locality, also tasks
>>>
>>> You can use cpusets to affect that.
>>
>> Could you please give more detail on this?
> 
> Documentation/cgroup-v1/cpusets.txt
> 
> Look for mems_allowed.

This is the attribute belong to cpuset cgroup isn't it?

Forgive me but I have no idea on how to combined this
with memory cgroup's locality hierarchical update...
parent memory cgroup do not have influence on mems_allowed
to it's children, correct?

What about we just account the locality status of child
memory group into it's ancestors?

Regards,
Michael Wang

>