From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 28 Jul 2011 04:55:13 +0000 (+0200)
Subject: vfs: avoid call to inode_lru_list_del() if possible
X-Git-Tag: v3.1-rc1~91^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4ae0c65455c1bb30d1b71c6dd9a1a62aadde8ef;p=pandora-kernel.git

vfs: avoid call to inode_lru_list_del() if possible

inode_lru_list_del() is expensive because of per superblock lru locking,
while some inodes are not in lru list.

Adding a check in iput_final() can speedup pipe/sockets workloads on
SMP.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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