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

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Message-ID: <alpine.DEB.2.00.1205301737530.25774@chino.kir.corp.google.com>
Date:	Wed, 30 May 2012 17:44:43 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...il.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

On Thu, 31 May 2012, Kamezawa Hiroyuki wrote:

> My test with sysfs node's meminfo seems to work...
> 
> [root@...00-1 qqm]# mount --bind /sys/devices/system/node/node0/meminfo
> /proc/meminfo
> [root@...00-1 qqm]# cat /proc/meminfo
> 
> Node 0 MemTotal:        8379636 kB

This doesn't seem like a good idea unless the application supports the 
"Node 0" prefix in /proc/meminfo.

If any application really cares about the amount of memory available to 
it, it should be taught to be memcg aware.  Then do something like

cat $(grep memory /proc/mounts | cut -d " " -f 2)/$(grep memory /proc/self/cgroup | cut -d : -f 3)/memory.limit_in_bytes

but since that value can change all the time then it doesn't seem helpful 
unless we have a userspace notifier.
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