From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 7 Oct 2010 10:44:07 +0000 (+0000)
Subject: neigh: Protect neigh->ha[] with a seqlock
X-Git-Tag: v2.6.37-rc1~147^2~166
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ed8ddf4045fcfcac36bad753dc4046118c603ec;p=pandora-kernel.git

neigh: Protect neigh->ha[] with a seqlock

Add a seqlock in struct neighbour to protect neigh->ha[], and avoid
dirtying neighbour in stress situation (many different flows / dsts)

Dirtying takes place because of read_lock(&n->lock) and n->used writes.

Switching to a seqlock, and writing n->used only on jiffies changes
permits less dirtying.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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