Commit b12362bd authored Jul 28, 2011 by Eric Dumazet Committed by Al Viro Aug 01, 2011

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>

parent 5a30d8a2

fs/inode.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -454,7 +454,9 @@ static void evict(struct inode *inode)
		BUG_ON(!(inode->i_state & I_FREEING));
		BUG_ON(!list_empty(&inode->i_lru));

		if (!list_empty(&inode->i_wb_list))
		inode_wb_list_del(inode);

		inode_sb_list_del(inode);

		if (op->evict_inode) {