From: Octavian Purdila <opurdila@ixiacom.com>
Date: Mon, 13 Dec 2010 12:44:07 +0000 (+0000)
Subject: net: factorize sync-rcu call in unregister_netdevice_many
X-Git-Tag: v2.6.38-rc1~476^2~141
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=443457242beb6716b43db4d62fe148eab5515505;p=pandora-kernel.git

net: factorize sync-rcu call in unregister_netdevice_many

Add dev_close_many and dev_deactivate_many to factorize another
sync-rcu operation on the netdevice unregister path.

$ modprobe dummy numdummies=10000
$ ip link set dev dummy* up
$ time rmmod dummy

Without the patch           With the patch

real    0m 24.63s           real    0m 5.15s
user    0m 0.00s            user    0m 0.00s
sys     0m 6.05s            sys     0m 5.14s

Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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