Commit d27c3d89 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: select target segment with closer temperature in SSR mode 



In SSR mode, we can allocate target segment which has different
temperature type from the type of current block, in order to avoid
mixing coldest and hottest data/node as much as possible, change
SSR allocation policy to select closer temperature for current
block prior.

Signed-off-by: default avatarYunlong Song <yunlong.song@huawei.com>
Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 55523519

fs/f2fs/segment.c

+17 −6
Original line number Diff line number Diff line
@@ -1541,7 +1541,8 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type) 
{

	struct curseg_info *curseg = CURSEG_I(sbi, type);

	const struct victim_selection *v_ops = DIRTY_I(sbi)->v_ops;

	int i, n;

	int i, cnt;

	bool reversed = false;



	/* need_SSR() already forces to do this */

	if (v_ops->get_victim(sbi, &(curseg)->next_segno, BG_GC, type, SSR))
@@ -1549,14 +1550,24 @@ static int get_ssr_segment(struct f2fs_sb_info *sbi, int type) 


	/* For node segments, let's do SSR more intensively */

	if (IS_NODESEG(type)) {

		if (type >= CURSEG_WARM_NODE) {

			reversed = true;

			i = CURSEG_COLD_NODE;

		} else {

			i = CURSEG_HOT_NODE;

		n = CURSEG_COLD_NODE;

		}

		cnt = NR_CURSEG_NODE_TYPE;

	} else {

		if (type >= CURSEG_WARM_DATA) {

			reversed = true;

			i = CURSEG_COLD_DATA;

		} else {

			i = CURSEG_HOT_DATA;

		n = CURSEG_COLD_DATA;

		}

		cnt = NR_CURSEG_DATA_TYPE;

	}



	for (; i <= n; i++) {

	for (; cnt-- > 0; reversed ? i-- : i++) {

		if (i == type)

			continue;

		if (v_ops->get_victim(sbi, &(curseg)->next_segno,