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dm: reorder 'struct mapped_device' members to fix alignment and holes 

Saves 16 bytes by eliminating 4 4byte holes but more importantly:
numerous members that crossed cachelines were fixed.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-02-22 15:27:50 -05:00
parent 1d3aa6f683
commit 032482fda4
1 changed files with 18 additions and 16 deletions
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34
drivers/md/dm.c
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@ -126,8 +126,6 @@ struct dm_rq_clone_bio_info {
struct mapped_device {
struct srcu_struct io_barrier;
struct mutex suspend_lock;
atomic_t holders;
atomic_t open_count;
/*
* The current mapping (struct dm_table *).
@ -148,6 +146,9 @@ struct mapped_device {
/* Protect queue and type against concurrent access. */
struct mutex type_lock;
atomic_t holders;
atomic_t open_count;
struct dm_target *immutable_target;
struct target_type *immutable_target_type;
@ -162,8 +163,20 @@ struct mapped_device {
atomic_t pending[2];
wait_queue_head_t wait;
struct work_struct work;
struct bio_list deferred;
spinlock_t deferred_lock;
struct bio_list deferred;
/*
* Event handling.
*/
wait_queue_head_t eventq;
atomic_t event_nr;
atomic_t uevent_seq;
struct list_head uevent_list;
spinlock_t uevent_lock; /* Protect access to uevent_list */
/* the number of internal suspends */
unsigned internal_suspend_count;
/*
* Processing queue (flush)
@ -178,33 +191,22 @@ struct mapped_device {
struct bio_set *bs;
/*
* Event handling.
*/
atomic_t event_nr;
wait_queue_head_t eventq;
atomic_t uevent_seq;
struct list_head uevent_list;
spinlock_t uevent_lock; /* Protect access to uevent_list */
/*
* freeze/thaw support require holding onto a super block
*/
struct super_block *frozen_sb;
struct block_device *bdev;
/* forced geometry settings */
struct hd_geometry geometry;
struct block_device *bdev;
/* kobject and completion */
struct dm_kobject_holder kobj_holder;
/* zero-length flush that will be cloned and submitted to targets */
struct bio flush_bio;
/* the number of internal suspends */
unsigned internal_suspend_count;
struct dm_stats stats;
struct kthread_worker kworker;