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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>
This commit is contained in:
Mikulas Patocka 2013-07-10 23:41:18 +01:00 committed by Alasdair G Kergon
parent 83d5e5b0af
commit 2a7faeb176
1 changed files with 7 additions and 7 deletions
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14
drivers/md/dm.c
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@ -133,6 +133,13 @@ struct mapped_device {
atomic_t holders;
atomic_t open_count;
/*
* The current mapping.
* Use dm_get_live_table{_fast} or take suspend_lock for
* dereference.
*/
struct dm_table *map;
unsigned long flags;
struct request_queue *queue;
@ -161,13 +168,6 @@ struct mapped_device {
*/
struct workqueue_struct *wq;
/*
* The current mapping.
* Use dm_get_live_table{_fast} or take suspend_lock for
* dereference.
*/
struct dm_table *map;
/*
* io objects are allocated from here.
*/