Commit f9bb615a authored by Dennis Zhou's avatar Dennis Zhou Committed by David Sterba
Browse files

btrfs: make smaller extents more likely to go into bitmaps 



It's less than ideal for small extents to eat into our extent budget, so
force extents <= 32KB into the bitmaps save for the first handful.

Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarDennis Zhou <dennis@kernel.org>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 5d90c5c7

fs/btrfs/free-space-cache.c

+2 −2
Original line number Diff line number Diff line
@@ -2107,8 +2107,8 @@ static bool use_bitmap(struct btrfs_free_space_ctl *ctl, 
		 * of cache left then go ahead an dadd them, no sense in adding

		 * the overhead of a bitmap if we don't have to.

		 */

		if (info->bytes <= fs_info->sectorsize * 4) {

			if (ctl->free_extents * 2 <= ctl->extents_thresh)

		if (info->bytes <= fs_info->sectorsize * 8) {

			if (ctl->free_extents * 3 <= ctl->extents_thresh)

				return false;

		} else {

			return false;

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