From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sat, 24 Oct 2009 13:13:17 +0000 (-0700)
Subject: rtnetlink: speedup rtnl_dump_ifinfo()
X-Git-Tag: v2.6.33-rc1~388^2~705
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c28bd0b8ec4d128bd7660671d1b626b0abc471f;p=pandora-kernel.git

rtnetlink: speedup rtnl_dump_ifinfo()

When handling large number of netdevice, rtnl_dump_ifinfo()
is very slow because it has O(N^2) complexity.

Instead of scanning one single list, we can use the 256 sub lists
of the dev_index hash table.

This considerably speedups "ip link" operations

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