btrfs: zoned: use greedy gc for auto reclaim

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Currently auto reclaim of unusable zones reclaims the block-groups in
the order they have been added to the reclaim list.

Change this to a greedy algorithm by sorting the list so we have the
block-groups with the least amount of valid bytes reclaimed first.

Note: we can't splice the block groups from reclaim_bgs to let the sort
happen outside of the lock. The block groups can be still in use by
other parts eg. via bg_list and we must hold unused_bgs_lock while
processing them.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ write note and comment why we can't splice the list ]
Signed-off-by: David Sterba <dsterba@suse.com>

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Johannes Thumshirn 2021-10-14 18:39:02 +09:00 • committed by David Sterba

parent 813ebc164e

commit 2ca0ec770c

1 changed files with 22 additions and 0 deletions

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fs/btrfs/block-group.c

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