[PATCH] f2fs: write dirty meta pages collectively

[Jaegeuk Kim]

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@xxxxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/