[PATCH 14/14] dm-zoned: prefer full zones for reclaim

[Hannes Reinecke <hare@suse.de>]

Prefer full zones when selecting the next zone for reclaim.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 drivers/md/dm-zoned-metadata.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 6c8d4ddd8b27..e01ca1c57ff2 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1939,7 +1939,7 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
 						    unsigned int idx, bool idle)
 {
 	struct dm_zone *dzone = NULL;
-	struct dm_zone *zone;
+	struct dm_zone *zone, *last = NULL;
 	struct list_head *zone_list;
 
 	/* If we have cache zones select from the cache zone list */
@@ -1956,6 +1956,13 @@ static struct dm_zone *dmz_get_rnd_zone_for_reclaim(struct dmz_metadata *zmd,
 			dzone = zone->bzone;
 			if (dzone->dev->dev_idx != idx)
 				continue;
+			if (!last) {
+				last = dzone;
+				continue;
+			}
+			if (last->weight < dzone->weight)
+				continue;
+			dzone = last;
 		} else
 			dzone = zone;
 		if (dmz_lock_zone_reclaim(dzone))
-- 
2.16.4