Commit 982b48ae authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm: move hot dm_io members to same cacheline as dm_target_io 



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

Signed-off-by: default avatarMike Snitzer <snitzer@kernel.org>
parent 6cbce280

drivers/md/dm-core.h

+7 −5
Original line number Diff line number Diff line
@@ -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;

};