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

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Message-ID: <4E6FAA1B.5020102@parallels.com>
Date:	Tue, 13 Sep 2011 16:08:11 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	Paul Menage <paul@...lmenage.org>
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 09/13/2011 03:46 PM, Paul Menage wrote:
> 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
If we do that, we may have to commit to an intermediary user interface - 
with controls to to determine if kernel memory is billed to kernel or 
total, a enable/disable file, just to later render it pointless by a new 
optimization - that we seem to agree that seems possible.

I think it is preferred to always assume kernel memory is accounted to 
the kernel, and when we optimize it, no changes are made to what's 
exposed to userspace.
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