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btrfs: zoned: tweak reclaim threshold for zone capacity

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With the introduction of zone capacity, the range [capacity, length] is
always zone unusable. Counting this region as a reclaim target will
cause reclaiming too early. Reclaim block groups based on bytes that can
be usable after resetting.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Naohiro Aota 2021-08-19 21:19:11 +09:00 committed by David Sterba
parent 98173255bd
commit d8da0e8567
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/free-space-cache.c
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@ -2540,6 +2540,7 @@ static int __btrfs_add_free_space_zoned(struct btrfs_block_group *block_group,
u64 to_free, to_unusable;
const int bg_reclaim_threshold = READ_ONCE(fs_info->bg_reclaim_threshold);
bool initial = (size == block_group->length);
u64 reclaimable_unusable;
WARN_ON(!initial && offset + size > block_group->zone_capacity);
@ -2570,12 +2571,15 @@ static int __btrfs_add_free_space_zoned(struct btrfs_block_group *block_group,
spin_unlock(&block_group->lock);
}
reclaimable_unusable = block_group->zone_unusable -
(block_group->length - block_group->zone_capacity);
/* All the region is now unusable. Mark it as unused and reclaim */
if (block_group->zone_unusable == block_group->length) {
btrfs_mark_bg_unused(block_group);
} else if (bg_reclaim_threshold &&
block_group->zone_unusable >=
div_factor_fine(block_group->length, bg_reclaim_threshold)) {
reclaimable_unusable >=
div_factor_fine(block_group->zone_capacity,
bg_reclaim_threshold)) {
btrfs_mark_bg_to_reclaim(block_group);
}