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dm: adjust structure members to improve alignment

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Eliminate most holes in DM data structures that were modified by
commit 6f1c819c21 ("dm: convert to bioset_init()/mempool_init()").
Also prevent structure members from unnecessarily spanning cache
lines.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer
2018-05-22 18:26:20 -04:00
parent b2b04e7e2d
commit 72d711c876
9 changed files with 85 additions and 79 deletions
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38
drivers/md/dm-core.h
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@@ -31,6 +31,9 @@ struct dm_kobject_holder {
struct mapped_device {
struct mutex suspend_lock;
struct mutex table_devices_lock;
struct list_head table_devices;
/*
* The current mapping (struct dm_table *).
* Use dm_get_live_table{_fast} or take suspend_lock for
@@ -38,17 +41,14 @@ struct mapped_device {
*/
void __rcu *map;
struct list_head table_devices;
struct mutex table_devices_lock;
unsigned long flags;
struct request_queue *queue;
int numa_node_id;
enum dm_queue_mode type;
/* Protect queue and type against concurrent access. */
struct mutex type_lock;
enum dm_queue_mode type;
int numa_node_id;
struct request_queue *queue;
atomic_t holders;
atomic_t open_count;
@@ -56,21 +56,21 @@ struct mapped_device {
struct dm_target *immutable_target;
struct target_type *immutable_target_type;
char name[16];
struct gendisk *disk;
struct dax_device *dax_dev;
char name[16];
void *interface_ptr;
/*
* A list of ios that arrived while we were suspended.
*/
atomic_t pending[2];
wait_queue_head_t wait;
struct work_struct work;
wait_queue_head_t wait;
atomic_t pending[2];
spinlock_t deferred_lock;
struct bio_list deferred;
void *interface_ptr;
/*
* Event handling.
*/
@@ -83,17 +83,17 @@ struct mapped_device {
/* the number of internal suspends */
unsigned internal_suspend_count;
/*
* Processing queue (flush)
*/
struct workqueue_struct *wq;
/*
* io objects are allocated from here.
*/
struct bio_set io_bs;
struct bio_set bs;
/*
* Processing queue (flush)
*/
struct workqueue_struct *wq;
/*
* freeze/thaw support require holding onto a super block
*/
@@ -102,11 +102,11 @@ struct mapped_device {
/* forced geometry settings */
struct hd_geometry geometry;
struct block_device *bdev;
/* kobject and completion */
struct dm_kobject_holder kobj_holder;
struct block_device *bdev;
/* zero-length flush that will be cloned and submitted to targets */
struct bio flush_bio;