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authorMikulas Patocka <mpatocka@redhat.com>2013-07-10 18:41:18 -0400
committerAlasdair G Kergon <agk@redhat.com>2013-07-10 18:41:18 -0400
commit2a7faeb176fb0478bc6a0cb380c658b32179ead0 (patch)
tree25916d4ccb6887890e5e1d2a18cb1093863d7f32 /drivers/md/dm.c
parent83d5e5b0af907d46d241a86d9e44003b3f0accbd (diff)
dm: optimize reorder structure
This reorder actually improves performance by 20% (from 39.1s to 32.8s) on x86-64 quad core Opteron. I have no explanation for this, possibly it makes some other entries are better cache-aligned. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ecff83f5b53a..9e39d2b64bf8 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -133,6 +133,13 @@ struct mapped_device {
133 atomic_t holders; 133 atomic_t holders;
134 atomic_t open_count; 134 atomic_t open_count;
135 135
136 /*
137 * The current mapping.
138 * Use dm_get_live_table{_fast} or take suspend_lock for
139 * dereference.
140 */
141 struct dm_table *map;
142
136 unsigned long flags; 143 unsigned long flags;
137 144
138 struct request_queue *queue; 145 struct request_queue *queue;
@@ -162,13 +169,6 @@ struct mapped_device {
162 struct workqueue_struct *wq; 169 struct workqueue_struct *wq;
163 170
164 /* 171 /*
165 * The current mapping.
166 * Use dm_get_live_table{_fast} or take suspend_lock for
167 * dereference.
168 */
169 struct dm_table *map;
170
171 /*
172 * io objects are allocated from here. 172 * io objects are allocated from here.
173 */ 173 */
174 mempool_t *io_pool; 174 mempool_t *io_pool;