linux-kernel - Re: [PATCH] meminfo: show /proc/meminfo base on container's memcg

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Message-ID: <4FC718BA.8060608@jp.fujitsu.com>
Date:	Thu, 31 May 2012 16:07:38 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
CC:	David Rientjes <rientjes@...gle.com>,
	Gao feng <gaofeng@...fujitsu.com>, hannes@...xchg.org,
	mhocko@...e.cz, bsingharora@...il.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	linux-mm@...ck.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCH] meminfo: show /proc/meminfo base on container's memcg

(2012/05/31 15:37), KOSAKI Motohiro wrote:
> (5/31/12 2:28 AM), David Rientjes wrote:
>> On Thu, 31 May 2012, KOSAKI Motohiro wrote:
>>
>>>> An application should always know the cgroup that its attached to and be
>>>> able to read its state using the command that I gave earlier.
>>>
>>> No. you don't need why userland folks want namespaces. Even though you don't
>>> need namespaces. It doesn't good reason to refuse another use case.
>>>
>>
>> This is tangent to the discussion, we need to revisit why an application
>> other than a daemon managing a set of memcgs would ever need to know the
>> information in /proc/meminfo. No use-case was ever presented in the
>> changelog and its not clear how this is at all relevant. So before
>> changing the kernel, please describe how this actually matters in a real-
>> world scenario.
>
> Huh? Don't you know a meanings of a namespace ISOLATION? isolation mean,
> isolated container shouldn't be able to access global information. If you
> want to lean container/namespace concept, tasting openvz or solaris container
> is a good start.
>
> But anyway, I dislike current implementaion. So, I NAK this patch too.

Could you give us advice for improving this ? What idea do you have ?

Thanks,
-Kame


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