f2fs: record average update time of segment

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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>

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Chao Yu 2020-08-04 21:14:46 +08:00 • committed by Jaegeuk Kim

parent d0b9e42ab6

commit 6f3a01ae9b

1 changed files with 18 additions and 3 deletions

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fs/f2fs/segment.c

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