Re: [f2fs-dev] [PATCH v2 1/2] f2fs: use per-log target_bitmap to improve lookup performace of ssr allocation
From: Chao Yu
Date: Tue Sep 17 2024 - 22:17:17 EST
On 2024/5/31 9:10, Chao Yu wrote:
On 2024/5/31 7:39, Jaegeuk Kim wrote:
On 05/29, Chao Yu wrote:
Ping,
Jaegeuk,
Chao, sorry, I might need some time to take a look at the change cautiously.
No problem, I've done some tests on this patch, though, I will keeping this in
my queue, and do test base on the queue whenever it comes new patches.
Jaegeuk,
Any progress on this patchset?
Thanks,
Thanks,
On 2024/4/23 10:07, Chao Yu wrote:
Jaegeuk, any comments for this serials?
On 2024/4/11 16:23, Chao Yu wrote:
After commit 899fee36fac0 ("f2fs: fix to avoid data corruption by
forbidding SSR overwrite"), valid block bitmap of current openned
segment is fixed, let's introduce a per-log bitmap instead of temp
bitmap to avoid unnecessary calculation overhead whenever allocating
free slot w/ SSR allocator.
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
v2:
- rebase to last dev-test branch.
fs/f2fs/segment.c | 30 ++++++++++++++++++++++--------
fs/f2fs/segment.h | 1 +
2 files changed, 23 insertions(+), 8 deletions(-)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 6474b7338e81..af716925db19 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2840,31 +2840,39 @@ static int new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
return 0;
}
-static int __next_free_blkoff(struct f2fs_sb_info *sbi,
- int segno, block_t start)
+static void __get_segment_bitmap(struct f2fs_sb_info *sbi,
+ unsigned long *target_map,
+ int segno)
{
struct seg_entry *se = get_seg_entry(sbi, segno);
int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
- unsigned long *target_map = SIT_I(sbi)->tmp_map;
unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
int i;
for (i = 0; i < entries; i++)
target_map[i] = ckpt_map[i] | cur_map[i];
+}
+
+static int __next_free_blkoff(struct f2fs_sb_info *sbi, unsigned long *bitmap,
+ int segno, block_t start)
+{
+ __get_segment_bitmap(sbi, bitmap, segno);
- return __find_rev_next_zero_bit(target_map, BLKS_PER_SEG(sbi), start);
+ return __find_rev_next_zero_bit(bitmap, BLKS_PER_SEG(sbi), start);
}
static int f2fs_find_next_ssr_block(struct f2fs_sb_info *sbi,
- struct curseg_info *seg)
+ struct curseg_info *seg)
{
- return __next_free_blkoff(sbi, seg->segno, seg->next_blkoff + 1);
+ return __find_rev_next_zero_bit(seg->target_map,
+ BLKS_PER_SEG(sbi), seg->next_blkoff + 1);
}
bool f2fs_segment_has_free_slot(struct f2fs_sb_info *sbi, int segno)
{
- return __next_free_blkoff(sbi, segno, 0) < BLKS_PER_SEG(sbi);
+ return __next_free_blkoff(sbi, SIT_I(sbi)->tmp_map, segno, 0) <
+ BLKS_PER_SEG(sbi);
}
/*
@@ -2890,7 +2898,8 @@ static int change_curseg(struct f2fs_sb_info *sbi, int type)
reset_curseg(sbi, type, 1);
curseg->alloc_type = SSR;
- curseg->next_blkoff = __next_free_blkoff(sbi, curseg->segno, 0);
+ curseg->next_blkoff = __next_free_blkoff(sbi, curseg->target_map,
+ curseg->segno, 0);
sum_page = f2fs_get_sum_page(sbi, new_segno);
if (IS_ERR(sum_page)) {
@@ -4635,6 +4644,10 @@ static int build_curseg(struct f2fs_sb_info *sbi)
sizeof(struct f2fs_journal), GFP_KERNEL);
if (!array[i].journal)
return -ENOMEM;
+ array[i].target_map = f2fs_kzalloc(sbi, SIT_VBLOCK_MAP_SIZE,
+ GFP_KERNEL);
+ if (!array[i].target_map)
+ return -ENOMEM;
if (i < NR_PERSISTENT_LOG)
array[i].seg_type = CURSEG_HOT_DATA + i;
else if (i == CURSEG_COLD_DATA_PINNED)
@@ -5453,6 +5466,7 @@ static void destroy_curseg(struct f2fs_sb_info *sbi)
for (i = 0; i < NR_CURSEG_TYPE; i++) {
kfree(array[i].sum_blk);
kfree(array[i].journal);
+ kfree(array[i].target_map);
}
kfree(array);
}
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index e1c0f418aa11..10f3e44f036f 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -292,6 +292,7 @@ struct curseg_info {
struct f2fs_summary_block *sum_blk; /* cached summary block */
struct rw_semaphore journal_rwsem; /* protect journal area */
struct f2fs_journal *journal; /* cached journal info */
+ unsigned long *target_map; /* bitmap for SSR allocator */
unsigned char alloc_type; /* current allocation type */
unsigned short seg_type; /* segment type like CURSEG_XXX_TYPE */
unsigned int segno; /* current segment number */
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