dm zoned: start reclaim with sequential zones
Sequential zones perform better for reclaim, so start off using
them and only use random zones as a fallback when cache zones are
present.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
index bd62245..d62f689 100644
--- a/drivers/md/dm-zoned-reclaim.c
+++ b/drivers/md/dm-zoned-reclaim.c
@@ -281,15 +281,16 @@ static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc, struct dm_zone *dzone)
struct dm_zone *szone = NULL;
struct dmz_metadata *zmd = zrc->metadata;
int ret;
- int alloc_flags = dmz_nr_cache_zones(zmd) ?
- DMZ_ALLOC_RND : DMZ_ALLOC_SEQ;
+ int alloc_flags = DMZ_ALLOC_SEQ;
- /* Always use sequential zones to reclaim random zones */
- if (dmz_is_rnd(dzone))
- alloc_flags = DMZ_ALLOC_SEQ;
/* Get a free random or sequential zone */
dmz_lock_map(zmd);
+again:
szone = dmz_alloc_zone(zmd, alloc_flags | DMZ_ALLOC_RECLAIM);
+ if (!szone && alloc_flags == DMZ_ALLOC_SEQ && dmz_nr_cache_zones(zmd)) {
+ alloc_flags = DMZ_ALLOC_RND;
+ goto again;
+ }
dmz_unlock_map(zmd);
if (!szone)
return -ENOSPC;
