linux-kernel - Re: [PATCH v8 3/9] socket: initial cgroup code.

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Message-Id: <20111209104901.27c8692a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 9 Dec 2011 10:49:01 +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,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujtsu.com>
Subject: Re: [PATCH v8 3/9] socket: initial cgroup code.

On Mon,  5 Dec 2011 19:34:57 -0200
Glauber Costa <glommer@...allels.com> wrote:

> The goal of this work is to move the memory pressure tcp
> controls to a cgroup, instead of just relying on global
> conditions.
> 
> To avoid excessive overhead in the network fast paths,
> the code that accounts allocated memory to a cgroup is
> hidden inside a static_branch(). This branch is patched out
> until the first non-root cgroup is created. So when nobody
> is using cgroups, even if it is mounted, no significant performance
> penalty should be seen.
> 
> This patch handles the generic part of the code, and has nothing
> tcp-specific.
> 
> Signed-off-by: Glauber Costa <glommer@...allels.com>
> CC: Kirill A. Shutemov <kirill@...temov.name>
> CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujtsu.com>
> CC: David S. Miller <davem@...emloft.net>
> CC: Eric W. Biederman <ebiederm@...ssion.com>
> CC: Eric Dumazet <eric.dumazet@...il.com>

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

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