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>
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@ -133,6 +133,13 @@ struct mapped_device {
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atomic_t holders;
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atomic_t holders;
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atomic_t open_count;
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atomic_t open_count;
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/*
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* The current mapping.
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* Use dm_get_live_table{_fast} or take suspend_lock for
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* dereference.
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*/
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struct dm_table *map;
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unsigned long flags;
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unsigned long flags;
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struct request_queue *queue;
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struct request_queue *queue;
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@ -161,13 +168,6 @@ struct mapped_device {
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*/
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*/
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struct workqueue_struct *wq;
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struct workqueue_struct *wq;
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/*
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* The current mapping.
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* Use dm_get_live_table{_fast} or take suspend_lock for
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* dereference.
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*/
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struct dm_table *map;
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/*
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/*
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* io objects are allocated from here.
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* io objects are allocated from here.
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*/
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*/
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