linux-kernel - [PATCH 09/10] writeback: don't resort for a single super_block in move_expired

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Message-Id: <1253803236-20760-10-git-send-email-jens.axboe@oracle.com>
Date:	Thu, 24 Sep 2009 16:40:35 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	fengguang.wu@...el.com, shaohua.li@...el.com,
	chris.mason@...cle.com, jack@...e.cz,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 09/10] 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@...cle.com>
---
 fs/fs-writeback.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index b27406d..225c731 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);
-- 
1.6.4.1.207.g68ea

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