linux-kernel - [PATCH] f2fs: write dirty meta pages collectively

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Date:	Tue, 17 Dec 2013 17:31:58 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Jaegeuk Kim <jaegeuk.kim@...sung.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH] f2fs: write dirty meta pages collectively

This patch enhances writing dirty meta pages collectively in background.
During the file data writes, it'd better avoid to write small dirty meta pages
frequently.
So let's give a chance to collect a number of dirty meta pages for a while.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>
---
 fs/f2fs/checkpoint.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index f8c0749..2004b7b 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -108,17 +108,19 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
 {
 	struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
 	struct block_device *bdev = sbi->sb->s_bdev;
+	int nrpages = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
 	long written;
 
 	if (wbc->for_kupdate)
 		return 0;
 
-	if (get_pages(sbi, F2FS_DIRTY_META) == 0)
+	/* collect a number of dirty meta pages and write together */
+	if (get_pages(sbi, F2FS_DIRTY_META) < nrpages)
 		return 0;
 
 	/* if mounting is failed, skip writing node pages */
 	mutex_lock(&sbi->cp_mutex);
-	written = sync_meta_pages(sbi, META, bio_get_nr_vecs(bdev));
+	written = sync_meta_pages(sbi, META, nrpages);
 	mutex_unlock(&sbi->cp_mutex);
 	wbc->nr_to_write -= written;
 	return 0;
-- 
1.8.4.474.g128a96c

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