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writeback: don't resort for a single super_block in move_expired_inodes()

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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>
This commit is contained in:
Jens Axboe 2009-09-24 15:12:57 +02:00
parent 5c03449d34
commit cf137307cd
1 changed files with 11 additions and 1 deletions
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12
fs/fs-writeback.c
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@ -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);