From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Wed, 29 Oct 2014 18:29:31 +0000 (+0100)
Subject: neigh: optimize neigh_parms_release()
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~122^2~320
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75fbfd33234a71556bec34b099d98f970190905d;p=pandora-kernel.git

neigh: optimize neigh_parms_release()

In neigh_parms_release() we loop over all entries to find the entry given in
argument and being able to remove it from the list. By using a double linked
list, we can avoid this loop.

Here are some numbers with 30 000 dummy interfaces configured:

Before the patch:
$ time rmmod dummy
real	2m0.118s
user	0m0.000s
sys	1m50.048s

After the patch:
$ time rmmod dummy
real	1m9.970s
user	0m0.000s
sys	0m47.976s

Suggested-by: Thierry Herbelot <thierry.herbelot@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

Reading git-diff-tree failed