On Wed, 2020-05-27 at 08:22 +0200, Hannes Reinecke wrote:
> When allocating a zone we should pass in an indicator on which
> device the zone should be allocated; this increases performance
> for a multi-device setup as then reclaim can allocate zones on
> the device for which reclaim is running.
>
> Signed-off-by: Hannes Reinecke <h...@suse.de>
> ---
> drivers/md/dm-zoned-metadata.c | 17 +++++++++++------
> drivers/md/dm-zoned-reclaim.c | 3 ++-
> drivers/md/dm-zoned.h | 3 ++-
> 3 files changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
> index 689c1dd7ab20..0d65af94309a 100644
> --- a/drivers/md/dm-zoned-metadata.c
> +++ b/drivers/md/dm-zoned-metadata.c
> @@ -2045,7 +2045,7 @@ struct dm_zone *dmz_get_chunk_mapping(struct
> dmz_metadata *zmd, unsigned int chu
> goto out;
>
> /* Allocate a random zone */
> - dzone = dmz_alloc_zone(zmd, alloc_flags);
> + dzone = dmz_alloc_zone(zmd, 0, alloc_flags);
> if (!dzone) {
> if (dmz_dev_is_dying(zmd)) {
> dzone = ERR_PTR(-EIO);
> @@ -2151,7 +2151,7 @@ struct dm_zone *dmz_get_chunk_buffer(struct
> dmz_metadata *zmd,
> goto out;
>
> /* Allocate a random zone */
> - bzone = dmz_alloc_zone(zmd, alloc_flags);
> + bzone = dmz_alloc_zone(zmd, 0, alloc_flags);
> if (!bzone) {
> if (dmz_dev_is_dying(zmd)) {
> bzone = ERR_PTR(-EIO);
> @@ -2182,11 +2182,12 @@ struct dm_zone *dmz_get_chunk_buffer(struct
> dmz_metadata *zmd,
> * Get an unmapped (free) zone.
> * This must be called with the mapping lock held.
> */
> -struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long flags)
> +struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int
> dev_idx,
> + unsigned long flags)
> {
> struct list_head *list;
> struct dm_zone *zone;
> - unsigned int dev_idx = 0;
> + int i = 0;
>
> again:
> if (flags & DMZ_ALLOC_CACHE)
> @@ -2202,8 +2203,12 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata
> *zmd, unsigned long flags)
> */
> if (!(flags & DMZ_ALLOC_RECLAIM))
> return NULL;
> - if (dev_idx < zmd->nr_devs) {
> - dev_idx++;
> + /*
> + * Try to allocate from other devices
> + */
> + if (i < zmd->nr_devs) {
> + dev_idx = (dev_idx + 1) % zmd->nr_devs;
Hu ? You deleted dev_idx declaration above...
> + i++;
> goto again;
> }
>
> diff --git a/drivers/md/dm-zoned-reclaim.c b/drivers/md/dm-zoned-reclaim.c
> index 18edf1b9bf52..5a04e34d17a9 100644
> --- a/drivers/md/dm-zoned-reclaim.c
> +++ b/drivers/md/dm-zoned-reclaim.c
> @@ -288,7 +288,8 @@ static int dmz_reclaim_rnd_data(struct dmz_reclaim *zrc,
> struct dm_zone *dzone)
> /* Get a free random or sequential zone */
> dmz_lock_map(zmd);
> again:
> - szone = dmz_alloc_zone(zmd, alloc_flags | DMZ_ALLOC_RECLAIM);
> + szone = dmz_alloc_zone(zmd, zrc->dev_idx,
> + alloc_flags | DMZ_ALLOC_RECLAIM);
> if (!szone && alloc_flags == DMZ_ALLOC_SEQ && dmz_nr_cache_zones(zmd)) {
> alloc_flags = DMZ_ALLOC_RND;
> goto again;
> diff --git a/drivers/md/dm-zoned.h b/drivers/md/dm-zoned.h
> index f2a760f62db5..ec020bb1caf7 100644
> --- a/drivers/md/dm-zoned.h
> +++ b/drivers/md/dm-zoned.h
> @@ -214,7 +214,8 @@ bool dmz_dev_is_dying(struct dmz_metadata *zmd);
> #define DMZ_ALLOC_SEQ 0x04
> #define DMZ_ALLOC_RECLAIM 0x10
>
> -struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long
> flags);
> +struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd,
> + unsigned int dev_idx, unsigned long flags);
> void dmz_free_zone(struct dmz_metadata *zmd, struct dm_zone *zone);
>
> void dmz_map_zone(struct dmz_metadata *zmd, struct dm_zone *zone,
--
Damien Le Moal
Western Digital Research
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