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>
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@ -139,27 +139,33 @@ static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
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void clear_prefree_segments(struct f2fs_sb_info *sbi)
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{
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struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
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unsigned int segno = -1;
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unsigned long *prefree_map = dirty_i->dirty_segmap[PRE];
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unsigned int total_segs = TOTAL_SEGS(sbi);
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unsigned int start = 0, end = -1;
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mutex_lock(&dirty_i->seglist_lock);
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while (1) {
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segno = find_next_bit(dirty_i->dirty_segmap[PRE], total_segs,
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segno + 1);
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if (segno >= total_segs)
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int i;
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start = find_next_bit(prefree_map, total_segs, end + 1);
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if (start >= total_segs)
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break;
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end = find_next_zero_bit(prefree_map, total_segs, start + 1);
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if (test_and_clear_bit(segno, dirty_i->dirty_segmap[PRE]))
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dirty_i->nr_dirty[PRE]--;
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for (i = start; i < end; i++)
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clear_bit(i, prefree_map);
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/* Let's use trim */
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if (test_opt(sbi, DISCARD))
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blkdev_issue_discard(sbi->sb->s_bdev,
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START_BLOCK(sbi, segno) <<
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sbi->log_sectors_per_block,
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1 << (sbi->log_sectors_per_block +
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sbi->log_blocks_per_seg),
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GFP_NOFS, 0);
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dirty_i->nr_dirty[PRE] -= end - start;
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if (!test_opt(sbi, DISCARD))
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continue;
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blkdev_issue_discard(sbi->sb->s_bdev,
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START_BLOCK(sbi, start) <<
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sbi->log_sectors_per_block,
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(1 << (sbi->log_sectors_per_block +
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sbi->log_blocks_per_seg)) * (end - start),
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GFP_NOFS, 0);
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}
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mutex_unlock(&dirty_i->seglist_lock);
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}
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