linux-kernel - Re: [PATCH 1/2] net: fix sleeping while atomic problem in sock mem

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Message-Id: <20111216.153527.844718089764883031.davem@davemloft.net>
Date:	Fri, 16 Dec 2011 15:35:27 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	glommer@...allels.com
Cc:	linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	cgroups@...r.kernel.org, sfr@...b.auug.org.au, rdunlap@...otime.net
Subject: Re: [PATCH 1/2] net: fix sleeping while atomic problem in sock
 mem_cgroup.

From: Glauber Costa <glommer@...allels.com>
Date: Fri, 16 Dec 2011 14:51:59 +0400

> We can't scan the proto_list to initialize sock cgroups, as it
> holds a rwlock, and we also want to keep the code generic enough to
> avoid calling the initialization functions of protocols directly,
> 
> Convert proto_list_lock into a mutex, so we can sleep and do the
> necessary allocations. This lock is seldom taken, so there shouldn't
> be any performance penalties associated with that
> 
> Signed-off-by: Glauber Costa <glommer@...allels.com>

Applied.
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