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| author | Mike Snitzer <snitzer@redhat.com> | 2013-08-16 14:54:21 (GMT) |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-08-23 13:02:14 (GMT) |
| commit | c9ec5d7c7b4c3d84bb1b39bc36c5992fceb15a91 (patch) | |
| tree | 016052d62b177c280cec60d780a5f0a05ed525a9 /drivers | |
| parent | f610937214e2ac8c4225df9a124ea0de1f030626 (diff) | |
| download | linux-c9ec5d7c7b4c3d84bb1b39bc36c5992fceb15a91.tar.xz | |
dm cache: eliminate holes in cache structure
Reorder members in the cache structure to eliminate 6 out of 7 holes
(reclaiming 24 bytes). Also, the 'worker' and 'waker' members no longer
straddle cachelines.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-cache-target.c | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c index 22ff650..2956976 100644 --- a/drivers/md/dm-cache-target.c +++ b/drivers/md/dm-cache-target.c @@ -103,6 +103,8 @@ struct cache { struct dm_target *ti; struct dm_target_callbacks callbacks; + struct dm_cache_metadata *cmd; + /* * Metadata is written to this device. */ @@ -119,11 +121,6 @@ struct cache { struct dm_dev *cache_dev; /* - * Cache features such as write-through. - */ - struct cache_features features; - - /* * Size of the origin device in _complete_ blocks and native sectors. */ dm_oblock_t origin_blocks; @@ -140,8 +137,6 @@ struct cache { uint32_t sectors_per_block; int sectors_per_block_shift; - struct dm_cache_metadata *cmd; - spinlock_t lock; struct bio_list deferred_bios; struct bio_list deferred_flush_bios; @@ -150,8 +145,8 @@ struct cache { struct list_head completed_migrations; struct list_head need_commit_migrations; sector_t migration_threshold; - atomic_t nr_migrations; wait_queue_head_t migration_wait; + atomic_t nr_migrations; /* * cache_size entries, dirty if set @@ -162,9 +157,16 @@ struct cache { /* * origin_blocks entries, discarded if set. */ - uint32_t discard_block_size; /* a power of 2 times sectors per block */ dm_dblock_t discard_nr_blocks; unsigned long *discard_bitset; + uint32_t discard_block_size; /* a power of 2 times sectors per block */ + + /* + * Rather than reconstructing the table line for the status we just + * save it and regurgitate. + */ + unsigned nr_ctr_args; + const char **ctr_args; struct dm_kcopyd_client *copier; struct workqueue_struct *wq; @@ -189,14 +191,12 @@ struct cache { bool loaded_mappings:1; bool loaded_discards:1; - struct cache_stats stats; - /* - * Rather than reconstructing the table line for the status we just - * save it and regurgitate. + * Cache features such as write-through. */ - unsigned nr_ctr_args; - const char **ctr_args; + struct cache_features features; + + struct cache_stats stats; }; struct per_bio_data { |