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authorEric Dumazet <eric.dumazet@gmail.com>2011-07-28 06:11:47 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2011-08-01 01:41:17 -0400
commitb12362bdb61a230a67daa77bcd2a11e59b2802e1 (patch)
treef85752d085d3618207ef6aa5b7d8a10910201fc5 /fs/inode.c
parent5a30d8a2b8ddd5102c440c7e5a7c8e1fd729c818 (diff)
downloadlinux-b12362bdb61a230a67daa77bcd2a11e59b2802e1.tar.gz
vfs: conditionally call inode_wb_list_del()
Some inodes (pipes, sockets, ...) are not in bdi writeback list. evict() can avoid calling inode_wb_list_del() and its expensive spinlock by checking inode i_wb_list being empty or not. At this point, no other cpu/user can concurrently manipulate this inode i_wb_list Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/inode.c b/fs/inode.c
index d0c72ff6b30..9dab13ae6ef 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -454,7 +454,9 @@ static void evict(struct inode *inode)
BUG_ON(!(inode->i_state & I_FREEING));
BUG_ON(!list_empty(&inode->i_lru));
- inode_wb_list_del(inode);
+ if (!list_empty(&inode->i_wb_list))
+ inode_wb_list_del(inode);
+
inode_sb_list_del(inode);
if (op->evict_inode) {