[dm-devel] [dm-5.19 PATCH 08/21] dm: move hot dm_io members to same cacheline as dm_target_io

[Mike Snitzer]

Just saves some cacheline bouncing for members accessed during cloned
bio submission and completion.

Signed-off-by: Mike Snitzer <snitzer at kernel.org>
---
 drivers/md/dm-core.h | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index db069fa9cee5..41d6511dc7cf 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -250,17 +250,19 @@ static inline bool dm_tio_is_normal(struct dm_target_io *tio)
 #define DM_IO_MAGIC 19577
 struct dm_io {
 	unsigned short magic;
-	blk_short_t flags;
-	atomic_t io_count;
-	struct mapped_device *md;
-	struct bio *orig_bio;
-	blk_status_t status;
+
 	spinlock_t lock;
 	unsigned long start_time;
 	void *data;
 	struct hlist_node node;
 	struct task_struct *map_task;
 	struct dm_stats_aux stats_aux;
+
+	blk_short_t flags;
+	blk_status_t status;
+	atomic_t io_count;
+	struct mapped_device *md;
+	struct bio *orig_bio;
 	/* last member of dm_target_io is 'struct bio' */
 	struct dm_target_io tio;
 };
-- 
2.15.0