[PATCH v2 3/4] dm: enable BIOSET_PERCPU_CACHE for dm_io bioset

[Mike Snitzer <snitzer@redhat.com>]

Also change dm_io_complete() to use bio_clear_polled() so that it
properly clears all associated bio state (REQ_POLLED, BIO_PERCPU_CACHE,
etc).

This commit improves DM's hipri bio polling (REQ_POLLED) perf by ~7%.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 drivers/md/dm.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1c4d1e12d74b..b3cb2c1aea2a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -899,9 +899,9 @@ static void dm_io_complete(struct dm_io *io)
 		/*
 		 * Upper layer won't help us poll split bio, io->orig_bio
 		 * may only reflect a subset of the pre-split original,
-		 * so clear REQ_POLLED in case of requeue
+		 * so clear REQ_POLLED and BIO_PERCPU_CACHE on requeue.
 		 */
-		bio->bi_opf &= ~REQ_POLLED;
+		bio_clear_polled(bio);
 		return;
 	}
 
@@ -3016,7 +3016,7 @@ struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_qu
 		pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
 		front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + DM_TARGET_IO_BIO_OFFSET;
 		io_front_pad = roundup(per_io_data_size,  __alignof__(struct dm_io)) + DM_IO_BIO_OFFSET;
-		ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0);
+		ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, BIOSET_PERCPU_CACHE);
 		if (ret)
 			goto out;
 		if (integrity && bioset_integrity_create(&pools->io_bs, pool_size))
-- 
2.15.0