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Subject[PATCH 2/2] Revert "f2fs: add ovp valid_blocks check for bg gc victim to fg_gc"
Date
For extreme case:
10 section, op = 10%, no_fggc_threshold = 90%
All section usage: 85% 85% 85% 85% 90% 90% 95% 95% 95% 95%

During foreground GC, if we skip select dirty section whose usage
is larger than no_fggc_threshold, we can only recycle 80% invalid
space from four 85% usage sections and two 90% usage sections,
result in encountering out-of-space issue.

This reverts commit e93b9865251a0503d83fd570e7d5a7c8bc351715 to
fix this issue, besides, we keep the logic that we scan all dirty
section when searching a victim, so that GC can select victim with
least valid blocks.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/f2fs.h | 3 ---
fs/f2fs/gc.c | 16 ----------------
fs/f2fs/segment.h | 9 ---------
3 files changed, 28 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 64e3677998d8..9f8b327272df 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1192,9 +1192,6 @@ struct f2fs_sb_info {
struct f2fs_gc_kthread *gc_thread; /* GC thread */
unsigned int cur_victim_sec; /* current victim section num */

- /* threshold for converting bg victims for fg */
- u64 fggc_threshold;
-
/* threshold for gc trials on pinned files */
u64 gc_pin_file_threshold;

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 3134dd781252..62eba4a71123 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -263,10 +263,6 @@ static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
for_each_set_bit(secno, dirty_i->victim_secmap, MAIN_SECS(sbi)) {
if (sec_usage_check(sbi, secno))
continue;
-
- if (no_fggc_candidate(sbi, secno))
- continue;
-
clear_bit(secno, dirty_i->victim_secmap);
return GET_SEG_FROM_SEC(sbi, secno);
}
@@ -406,9 +402,6 @@ static int get_victim_by_default(struct f2fs_sb_info *sbi,
goto next;
if (gc_type == BG_GC && test_bit(secno, dirty_i->victim_secmap))
goto next;
- if (gc_type == FG_GC && p.alloc_mode == LFS &&
- no_fggc_candidate(sbi, secno))
- goto next;

cost = get_gc_cost(sbi, segno, &p);

@@ -1152,17 +1145,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,

void build_gc_manager(struct f2fs_sb_info *sbi)
{
- u64 main_count, resv_count, ovp_count;
-
DIRTY_I(sbi)->v_ops = &default_v_ops;

- /* threshold of # of valid blocks in a section for victims of FG_GC */
- main_count = SM_I(sbi)->main_segments << sbi->log_blocks_per_seg;
- resv_count = SM_I(sbi)->reserved_segments << sbi->log_blocks_per_seg;
- ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
-
- sbi->fggc_threshold = div64_u64((main_count - ovp_count) *
- BLKS_PER_SEC(sbi), (main_count - resv_count));
sbi->gc_pin_file_threshold = DEF_GC_FAILED_PINNED_FILES;

/* give warm/cold data area from slower device */
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 7702b054689c..c385daabcb67 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -774,15 +774,6 @@ static inline block_t sum_blk_addr(struct f2fs_sb_info *sbi, int base, int type)
- (base + 1) + type;
}

-static inline bool no_fggc_candidate(struct f2fs_sb_info *sbi,
- unsigned int secno)
-{
- if (get_valid_blocks(sbi, GET_SEG_FROM_SEC(sbi, secno), true) >
- sbi->fggc_threshold)
- return true;
- return false;
-}
-
static inline bool sec_usage_check(struct f2fs_sb_info *sbi, unsigned int secno)
{
if (IS_CURSEC(sbi, secno) || (sbi->cur_victim_sec == secno))
--
2.15.0.55.gc2ece9dc4de6
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