[dm-devel] [PATCH 12/15] dm-zoned: allocate zone by device index
Hannes Reinecke
hare at suse.de
Tue Jun 2 11:09:53 UTC 2020
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 <hare at suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal at wdc.com>
---
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 221163ae5f68..7f46b2ea554c 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -2048,7 +2048,7 @@ 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);
@@ -2154,7 +2154,7 @@ 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);
@@ -2185,11 +2185,12 @@ 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)
@@ -2205,8 +2206,12 @@ 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;
+ 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,
--
2.16.4
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