netdev - Re: [PATCH v4 4/8] per-cgroup tcp buffers control

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Message-ID: <4E8A9D04.7060002@parallels.com>
Date:	Tue, 4 Oct 2011 09:43:32 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	<linux-kernel@...r.kernel.org>, <paul@...lmenage.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>
Subject: Re: [PATCH v4 4/8] per-cgroup tcp buffers control

On 10/04/2011 05:16 AM, KAMEZAWA Hiroyuki wrote:
> It seems memcg->tcp.tcp_memory_pressure has no locks and not atomic.
>
> no problematic race ?
>
> Thanks,
> -Kame
Well,

prior to this patch, it was a global variable. And nobody complained so 
far...

My impression is that the only thing that really needs to be atomic is
the memory accounting, which is already. If we miss a memory pressure 
condition entry, we'll get to it next time.

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