netdev - Re: [PATCH v8 6/9] tcp buffer limitation: per-cgroup limit

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Message-Id: <20111209105519.c4d885c9.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 9 Dec 2011 10:55:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, lizf@...fujitsu.com,
	ebiederm@...ssion.com, davem@...emloft.net, gthelen@...gle.com,
	netdev@...r.kernel.org, linux-mm@...ck.org, kirill@...temov.name,
	avagin@...allels.com, devel@...nvz.org, eric.dumazet@...il.com,
	cgroups@...r.kernel.org, hannes@...xchg.org, mhocko@...e.cz
Subject: Re: [PATCH v8 6/9] tcp buffer limitation: per-cgroup limit

On Mon,  5 Dec 2011 19:35:00 -0200
Glauber Costa <glommer@...allels.com> wrote:

> This patch uses the "tcp.limit_in_bytes" field of the kmem_cgroup to
> effectively control the amount of kernel memory pinned by a cgroup.
> 
> This value is ignored in the root cgroup, and in all others,
> caps the value specified by the admin in the net namespaces'
> view of tcp_sysctl_mem.
> 
> If namespaces are being used, the admin is allowed to set a
> value bigger than cgroup's maximum, the same way it is allowed
> to set pretty much unlimited values in a real box.
> 
> Signed-off-by: Glauber Costa <glommer@...allels.com>
> CC: David S. Miller <davem@...emloft.net>
> CC: Hiroyouki Kamezawa <kamezawa.hiroyu@...fujitsu.com>
> CC: Eric W. Biederman <ebiederm@...ssion.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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