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

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Message-ID: <37474414-1a54-8e3a-60df-eb7e5e1cc1ed@linux.alibaba.com>
Date:   Fri, 12 Jul 2019 17:11:25 +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?

> 
>> running in a particular group have no influence to others, not to mention the
>> extra overhead, does it really meaningful to account the stuff hierarchically?
> 
> AFAIU it's a requirement of cgroups to be hierarchical. All our other
> cgroup accounting is like that.

Ok, should respect the convention :-)

Regards,
Michael Wang

>