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btrfs: avoid unnecessary reclaim calculation in priority_reclaim_metadata_space()

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If the given ticket was already served (its ->bytes is 0), then we wasted
time calculating the metadata reclaim size. So calculate it only after we
checked the ticket was not yet served.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2025-10-17 17:14:11 +01:00 committed by David Sterba
parent 4ddb077378
commit afbc047ab0
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/space-info.c
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@ -1501,7 +1501,6 @@ static void priority_reclaim_metadata_space(struct btrfs_space_info *space_info,
int flush_state = 0;
spin_lock(&space_info->lock);
to_reclaim = btrfs_calc_reclaim_metadata_size(space_info);
/*
* This is the priority reclaim path, so to_reclaim could be >0 still
* because we may have only satisfied the priority tickets and still
@ -1513,6 +1512,8 @@ static void priority_reclaim_metadata_space(struct btrfs_space_info *space_info,
return;
}
to_reclaim = btrfs_calc_reclaim_metadata_size(space_info);
while (flush_state < states_nr) {
spin_unlock(&space_info->lock);
flush_space(space_info, to_reclaim, states[flush_state], false);