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

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Date:	Thu, 31 May 2012 02:37:25 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.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

(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.
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