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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: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dennis Zhou 2020-01-02 16:26:44 -05:00 committed by David Sterba
parent 5d90c5c757
commit f9bb615af2
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/free-space-cache.c
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@ -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;