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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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63
drivers/md/dm-cache-target.c
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@@ -371,7 +371,13 @@ struct cache_stats {
struct cache {
struct dm_target *ti;
struct dm_target_callbacks callbacks;
spinlock_t lock;
/*
* Fields for converting from sectors to blocks.
*/
int sectors_per_block_shift;
sector_t sectors_per_block;
struct dm_cache_metadata *cmd;
@@ -402,13 +408,11 @@ struct cache {
dm_cblock_t cache_size;
/*
* Fields for converting from sectors to blocks.
* Invalidation fields.
*/
sector_t sectors_per_block;
int sectors_per_block_shift;
spinlock_t invalidation_lock;
struct list_head invalidation_requests;
spinlock_t lock;
struct bio_list deferred_bios;
sector_t migration_threshold;
wait_queue_head_t migration_wait;
atomic_t nr_allocated_migrations;
@@ -419,13 +423,11 @@ struct cache {
*/
atomic_t nr_io_migrations;
struct bio_list deferred_bios;
struct rw_semaphore quiesce_lock;
/*
* cache_size entries, dirty if set
*/
atomic_t nr_dirty;
unsigned long *dirty_bitset;
struct dm_target_callbacks callbacks;
/*
* origin_blocks entries, discarded if set.
@@ -442,24 +444,20 @@ struct cache {
const char **ctr_args;
struct dm_kcopyd_client *copier;
struct workqueue_struct *wq;
struct work_struct deferred_bio_worker;
struct work_struct migration_worker;
struct workqueue_struct *wq;
struct delayed_work waker;
struct dm_bio_prison_v2 *prison;
struct bio_set bs;
mempool_t migration_pool;
/*
* cache_size entries, dirty if set
*/
unsigned long *dirty_bitset;
atomic_t nr_dirty;
struct dm_cache_policy *policy;
unsigned policy_nr_args;
bool need_tick_bio:1;
bool sized:1;
bool invalidate:1;
bool commit_requested:1;
bool loaded_mappings:1;
bool loaded_discards:1;
struct dm_cache_policy *policy;
/*
* Cache features such as write-through.
@@ -468,18 +466,23 @@ struct cache {
struct cache_stats stats;
/*
* Invalidation fields.
*/
spinlock_t invalidation_lock;
struct list_head invalidation_requests;
bool need_tick_bio:1;
bool sized:1;
bool invalidate:1;
bool commit_requested:1;
bool loaded_mappings:1;
bool loaded_discards:1;
struct rw_semaphore background_work_lock;
struct batcher committer;
struct work_struct commit_ws;
struct io_tracker tracker;
struct work_struct commit_ws;
struct batcher committer;
mempool_t migration_pool;
struct rw_semaphore background_work_lock;
struct bio_set bs;
};
struct per_bio_data {