linux-kernel - Re: [RFD] Merge task counter into memcg

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Message-ID: <4F8E646B.1020807@jp.fujitsu.com>
Date:	Wed, 18 Apr 2012 15:51:23 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
CC:	Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Walsh <dwalsh@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFD] Merge task counter into memcg

(2012/04/18 1:52), Glauber Costa wrote:

> 
>>> In short, I don't think it's better to have task-counting and fd-counting in memcg.
>>> It's kmem, but it's more than that, I think.
>>> Please provide subsys like ulimit.
>>
>> So, you think that while kmem would be enough to prevent fork-bombs,
>> it would still make sense to limit in more traditional ways
>> (ie. ulimit style object limits).  Hmmm....
>>
> 
> I personally think this is namespaces business, not cgroups.
> If you have a process namespace, an interface that works to limit the 
> number of processes should keep working given the constraints you are 
> given.
> 
> What doesn't make sense, is to create a *new* interface to limit 
> something that doesn't really need to be limited, just because you
> limited a similar resource before.
> 


Ok, limitiing forkbomb is unnecessary. ulimit+namespace should work.
What we need is user-id namespace, isn't it ? If we have that, ulimit
works enough fine, no overheads.

Thanks,
-Kame

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