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: Yunlong Song <yunlong.s...@huawei.com>
Signed-off-by: Chao Yu <yuch...@huawei.com>
---
fs/f2fs/segment.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9eb6d89bf9e2..3a8a4d9888f1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1539,7 +1539,8 @@ 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))
@@ -1547,14 +1548,24 @@ 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)) {
- i = CURSEG_HOT_NODE;
- n = CURSEG_COLD_NODE;
+ if (type >= CURSEG_WARM_NODE) {
+ reversed = true;
+ i = CURSEG_COLD_NODE;
+ } else {
+ i = CURSEG_HOT_NODE;
+ }
+ cnt = NR_CURSEG_NODE_TYPE;
} else {
- i = CURSEG_HOT_DATA;
- n = CURSEG_COLD_DATA;
+ if (type >= CURSEG_WARM_DATA) {
+ reversed = true;
+ i = CURSEG_COLD_DATA;
+ } else {
+ i = CURSEG_HOT_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,
--
2.8.2.295.g3f1c1d0
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