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authorChangman Lee <cm224.lee@samsung.com>2013-11-15 13:21:16 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-12-23 10:17:59 +0900
commite81c93cf8c7bd413898798cf8c67f18b1fef3360 (patch)
tree6d57a57281d4ade400f3abac03511caf3a81eb34 /fs/f2fs/segment.c
parent9a7f143ab529352ebef13d3f0f4a09f13efa9435 (diff)
f2fs: improve searching speed of __next_free_blkoff
To find a zero bit using the result of OR operation between ckpt_valid_map and cur_valid_map is more fast than find a zero bit in each bitmap. Signed-off-by: Changman Lee <cm224.lee@samsung.com> [Jaegeuk Kim: adjust changed function name] Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/segment.c')
-rw-r--r--fs/f2fs/segment.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index aa1d30d7671..67f1e5bbdac 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -607,13 +607,18 @@ static void __next_free_blkoff(struct f2fs_sb_info *sbi,
struct curseg_info *seg, block_t start)
{
struct seg_entry *se = get_seg_entry(sbi, seg->segno);
- block_t ofs;
- for (ofs = start; ofs < sbi->blocks_per_seg; ofs++) {
- if (!f2fs_test_bit(ofs, se->ckpt_valid_map)
- && !f2fs_test_bit(ofs, se->cur_valid_map))
- break;
- }
- seg->next_blkoff = ofs;
+ int entries = SIT_VBLOCK_MAP_SIZE / sizeof(unsigned long);
+ unsigned long target_map[entries];
+ unsigned long *ckpt_map = (unsigned long *)se->ckpt_valid_map;
+ unsigned long *cur_map = (unsigned long *)se->cur_valid_map;
+ int i, pos;
+
+ for (i = 0; i < entries; i++)
+ target_map[i] = ckpt_map[i] | cur_map[i];
+
+ pos = __find_rev_next_zero_bit(target_map, sbi->blocks_per_seg, start);
+
+ seg->next_blkoff = pos;
}
/*