f2fs: avoid small data writes by skipping writepages

This patch introduces nr_pages_to_skip(sbi, type) to determine writepages can
be skipped.
The dentry, node, and meta pages can be conrolled by F2FS without breaking the
FS consistency.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 3e36240d81c1..cb514f1896ab 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1198,12 +1198,6 @@ redirty_out:
         return AOP_WRITEPAGE_ACTIVATE;
 }
 
-/*
- * It is very important to gather dirty pages and write at once, so that we can
- * submit a big bio without interfering other data writes.
- * Be default, 512 pages (2MB) * 3 node types, is more reasonable.
- */
-#define COLLECT_DIRTY_NODES     1536
 static int f2fs_write_node_pages(struct address_space *mapping,
                             struct writeback_control *wbc)
 {
@@ -1214,7 +1208,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
         f2fs_balance_fs_bg(sbi);
 
         /* collect a number of dirty node pages and write together */
-        if (get_pages(sbi, F2FS_DIRTY_NODES) < COLLECT_DIRTY_NODES)
+        if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
                 return 0;
 
         /* if mounting is failed, skip writing node pages */