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Commit 2a7faeb1 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
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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: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 83d5e5b0

drivers/md/dm.c

+7 −7
Original line number Diff line number Diff line
@@ -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.

	 */