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authorChao Yu <yuchao0@huawei.com>2017-02-24 13:46:00 +0300
committerJaegeuk Kim <jaegeuk@kernel.org>2017-02-27 20:59:56 +0300
commitd27c3d89db9986b6f48576169031247e4c893729 (patch)
tree5f1a9f1c6cafb44fcca156d74f74af238ffd3ac5 /fs/f2fs
parent55523519bc7227e651fd4febeb3aafdd22b8af1c (diff)
downloadlinux-d27c3d89db9986b6f48576169031247e4c893729.tar.xz
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: Yunlong Song <yunlong.song@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/segment.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1bab09097590..9006d8ed6f52 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -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)) {
- 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,