netdev - Re: [PATCH] per-cgroup tcp buffer limitation

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Message-ID: <CALdu-PDGpBnVHW7E5NobAwtXop5c03NTmijkk8oB7u-a5LEXww@mail.gmail.com>
Date:	Tue, 13 Sep 2011 11:46:29 -0700
From:	Paul Menage <paul@...lmenage.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, containers@...ts.osdl.org,
	netdev@...r.kernel.org, xemul@...allels.com,
	"David S. Miller" <davem@...emloft.net>,
	Hiroyouki Kamezawa <kamezawa.hiroyu@...fujitsu.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	Lennart Poettering <lennart@...ttering.net>
Subject: Re: [PATCH] per-cgroup tcp buffer limitation

On Tue, Sep 13, 2011 at 11:11 AM, Glauber Costa <glommer@...allels.com> wrote:
>
> What if they are all updated under the same lock ?

Right, that would be the kind of optimization that would remove the
need for worrying about whether or not to account it. It would
probably mean creating some memcg-specific structures like
res-counters that could handle multiple values, since you'd need to
update both the kernel charge and the total charge, in this cgroup
*and* its ancestors.

Paul
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