From d27c3d89db9986b6f48576169031247e4c893729 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Fri, 24 Feb 2017 18:46:00 +0800 Subject: [PATCH] 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 Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- 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 1bab090..9006d8e 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, -- 2.7.4