netdev - Re: [PATCH net-next] neigh: RCU conversion of struct neighbour

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Message-Id: <20101006.174934.232737066.davem@davemloft.net>
Date:	Wed, 06 Oct 2010 17:49:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] neigh: RCU conversion of struct neighbour

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 06 Oct 2010 17:54:16 +0200

> This is the second step for neighbour RCU conversion.
> 
> (first was commit d6bf7817 : RCU conversion of neigh hash table)
> 
> neigh_lookup() becomes lockless, but still take a reference on found
> neighbour. (no more read_lock()/read_unlock() on tbl->lock)
> 
> struct neighbour gets an additional rcu_head field and is freed after an
> RCU grace period.
> 
> Future work would need to eventually not take a reference on neighbour
> for temporary dst (DST_NOCACHE), but this would need dst->_neighbour to
> use a noref bit like we did for skb->_dst.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks Eric.
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