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f2fs: issue more large discard command 

o Changes from v1
  Use find_next(_zero)_bit suggested by jg.kim

When f2fs issues discard command, if segment is contiguous,
let's issue more large segment to gather adjacent segments.

** blktrace **
179,1    0     5859    42.619023770   971  C   D 131072 + 2097152 [0]
179,1    0    33665   108.840475468   971  C   D 2228224 + 2494464 [0]
179,1    0    33671   109.131616427   971  C   D 14909440 + 344064 [0]
179,1    0    33677   109.137100677   971  C   D 15261696 + 4096 [0]

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Changman Lee 2013-11-11 09:24:37 +09:00 committed by Jaegeuk Kim
parent 1d15bd2034
commit 29e59c14ae
1 changed files with 20 additions and 14 deletions
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34
fs/f2fs/segment.c
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@ -139,27 +139,33 @@ static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
void clear_prefree_segments(struct f2fs_sb_info *sbi)
{
struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
unsigned int segno = -1;
unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
unsigned int total_segs = TOTAL_SEGS(sbi);
unsigned int start = 0, end = -1;
mutex_lock(&dirty_i->seglist_lock);
while (1) {
segno = find_next_bit(dirty_i->dirty_segmap[PRE], total_segs,
segno + 1);
if (segno >= total_segs)
int i;
start = find_next_bit(prefree_map, total_segs, end + 1);
if (start >= total_segs)
break;
end = find_next_zero_bit(prefree_map, total_segs, start + 1);
if (test_and_clear_bit(segno, dirty_i->dirty_segmap[PRE]))
dirty_i->nr_dirty[PRE]--;
for (i = start; i < end; i++)
clear_bit(i, prefree_map);
/* Let's use trim */
if (test_opt(sbi, DISCARD))
blkdev_issue_discard(sbi->sb->s_bdev,
START_BLOCK(sbi, segno) <<
sbi->log_sectors_per_block,
1 << (sbi->log_sectors_per_block +
sbi->log_blocks_per_seg),
GFP_NOFS, 0);
dirty_i->nr_dirty[PRE] -= end - start;
if (!test_opt(sbi, DISCARD))
continue;
blkdev_issue_discard(sbi->sb->s_bdev,
START_BLOCK(sbi, start) <<
sbi->log_sectors_per_block,
(1 << (sbi->log_sectors_per_block +
sbi->log_blocks_per_seg)) * (end - start),
GFP_NOFS, 0);
}
mutex_unlock(&dirty_i->seglist_lock);
}