From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 19 Oct 2009 19:18:49 +0000 (+0000)
Subject: net: Introduce dev_get_by_index_rcu()
X-Git-Tag: v2.6.33-rc1~388^2~600
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb699dfd426a189fe33b91586c15176a75c8aed0;p=pandora-kernel.git

net: Introduce dev_get_by_index_rcu()

Some workloads hit dev_base_lock rwlock pretty hard.
We can use RCU lookups to avoid touching this rwlock.

netdevices are already freed after a RCU grace period, so this patch
adds no penalty at device dismantle time.

dev_ifname() converted to dev_get_by_index_rcu()

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

Reading git-diff-tree failed