f2fs: record average update time of segment

Previously, once we update one block in segment, we will update mtime of
segment to last time, making aged segment becoming freshest, result in
that GC with cost benefit algorithm missing such segment, So this patch
changes to record mtime as average block updating time instead of last
updating time.

It's not needed to reset mtime for prefree segment, as se->valid_blocks
is zero, then old se->mtime won't take any weight with below calculation:

	se->mtime = div_u64(se->mtime * se->valid_blocks + mtime,
					se->valid_blocks + 1);

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 907fdaad59be3695f862cc116a73547926f73ff1..9f366b4f1dc785d6bab4f843c1555ef09d4a95e5 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2154,6 +2154,22 @@ static void __set_sit_entry_type(struct f2fs_sb_info *sbi, int type,
                __mark_sit_entry_dirty(sbi, segno);
 }
 
+static void update_segment_mtime(struct f2fs_sb_info *sbi, block_t blkaddr)
+{
+       unsigned int segno = GET_SEGNO(sbi, blkaddr);
+       struct seg_entry *se = get_seg_entry(sbi, segno);
+       unsigned long long mtime = get_mtime(sbi, false);
+
+       if (!se->mtime)
+               se->mtime = mtime;
+       else
+               se->mtime = div_u64(se->mtime * se->valid_blocks + mtime,
+                                               se->valid_blocks + 1);
+
+       if (mtime > SIT_I(sbi)->max_mtime)
+               SIT_I(sbi)->max_mtime = mtime;
+}
+
 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
 {
        struct seg_entry *se;
@@ -2173,10 +2189,9 @@ static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
        f2fs_bug_on(sbi, (new_vblocks < 0 ||
                        (new_vblocks > f2fs_usable_blks_in_seg(sbi, segno))));
 
+       update_segment_mtime(sbi, blkaddr);
+
        se->valid_blocks = new_vblocks;
-       se->mtime = get_mtime(sbi, false);
-       if (se->mtime > SIT_I(sbi)->max_mtime)
-               SIT_I(sbi)->max_mtime = se->mtime;
 
        /* Update valid block bitmap */
        if (del > 0) {