btrfs: zoned: make auto-reclaim less aggressive

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The current auto-reclaim algorithm starts reclaiming all block groups
with a zone_unusable value above a configured threshold. This is causing
a lot of reclaim IO even if there would be enough free zones on the
device.

Instead of only accounting a block groups zone_unusable value, also take
the ratio of free and not usable (written as well as zone_unusable)
bytes a device has into account.

Tested-by: Pankaj Raghav <p.raghav@samsung.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Johannes Thumshirn 2022-03-29 01:56:09 -07:00 • committed by David Sterba

parent ef972e7b5e

commit 3687fcb075

3 changed files with 43 additions and 0 deletions

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10

fs/btrfs/block-group.c

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27

fs/btrfs/zoned.c

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6

fs/btrfs/zoned.h

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