netdev - Re: [net-next PATCH 1/3] net: frag, avoid several CPUs grabbing same frag queue during LRU evictor loop

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Message-Id: <20130327.131006.2142647165754132919.davem@davemloft.net>
Date:	Wed, 27 Mar 2013 13:10:06 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	brouer@...hat.com, netdev@...r.kernel.org, fw@...len.de,
	dborkman@...hat.com, hannes@...essinduktion.org
Subject: Re: [net-next PATCH 1/3] net: frag, avoid several CPUs grabbing
 same frag queue during LRU evictor loop

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 27 Mar 2013 09:14:04 -0700

> On Wed, 2013-03-27 at 16:55 +0100, Jesper Dangaard Brouer wrote:
>> The LRU list is protected by its own lock, since commit 3ef0eb0db4
>> (net: frag, move LRU list maintenance outside of rwlock), and
>> no-longer by a read_lock.
>> 
>> This makes it possible, to remove the inet_frag_queue, which is about
>> to be "evicted", from the LRU list head.  This avoids the problem, of
>> several CPUs grabbing the same frag queue.
>> 
>> Note, cannot remove the inet_frag_lru_del() call in fq_unlink()
>> called by inet_frag_kill(), because inet_frag_kill() is also used in
>> other situations.  Thus, we use list_del_init() to allow this
>> double list_del to work.
>> 
>> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
>> ---
>> 
>>  net/ipv4/inet_fragment.c |    3 +++
>>  1 files changed, 3 insertions(+), 0 deletions(-)
>> 
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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