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

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On Wed, May 30, 2012 at 8:08 PM, Kamezawa Hiroyuki
<kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> (2012/05/31 6:38), David Rientjes wrote:
>>
>> On Tue, 29 May 2012, Gao feng wrote:
>>
>>> cgroup and namespaces are used for creating containers but some of
>>> information is not isolated/virtualized. This patch is for isolating
>>> /proc/meminfo
>>> information per container, which uses memory cgroup. By this, top,free
>>> and other tools under container can work as expected(show container's
>>> usage) without changes.
>>>
>>> This patch is a trial to show memcg's info in /proc/meminfo if 'current'
>>> is under a memcg other than root.
>>>
>>> we show /proc/meminfo base on container's memory cgroup.
>>> because there are lots of info can't be provide by memcg, and
>>> the cmds such as top, free just use some entries of /proc/meminfo,
>>> we replace those entries by memory cgroup.
>>>
>>> if container has no memcg, we will show host's /proc/meminfo
>>> as before.
>>>
>>> there is no idea how to deal with Buffers,I just set it zero,
>>> It's strange if Buffers bigger than MemTotal.
>>>
>>> Signed-off-by: Gao feng<gaofeng@xxxxxxxxxxxxxx>
>>
>>
>> Nack, this type of thing was initially tried with cpusets when a thread
>> was bound to a subset of nodes, i.e. only show the total amount of memory
>> spanned by those nodes.
>>
>
> Hmm. How about having memory.meminfo under memory cgroup directory and
> use it with bind mount ? (container tools will be able to help it.)
> Then, container applications(top,free,etc..) can read the values they wants.
> If admins don't want it, they'll not use bind mount.

+1. 50% users need namespace separation and others don't. We need a
selectability.

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