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authorJens Axboe <jens.axboe@oracle.com>2009-09-24 15:12:57 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-25 18:08:26 +0200
commitcf137307cd9827495b65e7d74ea2b610daa9898b (patch)
tree231053bd1730527ea91133ed923756c67739e71d
parent5c03449d34debca0deab58046377e1175c1bcd7e (diff)
writeback: don't resort for a single super_block in move_expired_inodes()
If we only moved inodes from a single super_block to the temporary list, there's no point in doing a resort for multiple super_blocks. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--fs/fs-writeback.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index b27406d51bc..225c7316344 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -336,17 +336,27 @@ static void move_expired_inodes(struct list_head *delaying_queue,
{
LIST_HEAD(tmp);
struct list_head *pos, *node;
- struct super_block *sb;
+ struct super_block *sb = NULL;
struct inode *inode;
+ int do_sb_sort = 0;
while (!list_empty(delaying_queue)) {
inode = list_entry(delaying_queue->prev, struct inode, i_list);
if (older_than_this &&
inode_dirtied_after(inode, *older_than_this))
break;
+ if (sb && sb != inode->i_sb)
+ do_sb_sort = 1;
+ sb = inode->i_sb;
list_move(&inode->i_list, &tmp);
}
+ /* just one sb in list, splice to dispatch_queue and we're done */
+ if (!do_sb_sort) {
+ list_splice(&tmp, dispatch_queue);
+ return;
+ }
+
/* Move inodes from one superblock together */
while (!list_empty(&tmp)) {
inode = list_entry(tmp.prev, struct inode, i_list);