dm zoned: start reclaim with sequential zones (c5c78859) · Commits · 戴 / test

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>

drivers/md/dm-zoned-reclaim.c

+6 −5

Original line number	Diff line number	Diff line
		@@ -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;

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