linux-kernel - Re: [RFC PATCH] memcg: export knobs for the defaul cgroup hierarchy

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Message-ID: <20140721124958.GD12921@htj.dyndns.org>
Date:	Mon, 21 Jul 2014 08:49:58 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	Glauber Costa <glommer@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC PATCH] memcg: export knobs for the defaul cgroup hierarchy

On Mon, Jul 21, 2014 at 04:03:32PM +0400, Vladimir Davydov wrote:
> I think it's all about how we're going to use memory cgroups. If we're
> going to use them for application containers, there's simply no such
> problem, because we only want to isolate a potentially dangerous process
> group from the rest of the system. If we want to start a fully
> virtualized OS inside a container, then we certainly need a kind of

For shell environments, ulimit is a much better specific protection
mechanism against fork bombs and process-granular OOM killers would
behave mostly equivalently during fork bombing to the way it'd behave
in the host environment w/o cgroups.  I'm having a hard time seeing
why this would need any special treatment from cgroups.

Thanks.

-- 
tejun
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