Move the cow field between wire_count and hold_count. This is the position that is 64-bit aligned and makes sure that the valid and dirty fields are also 64-bit aligned. This means that if PAGE_SIZE is 32K, the size of the vm_page structure is only increased by 8 bytes instead of 16 bytes. More importantly, the vm_page structure is either 120 or 128 bytes on ia64. These are "interesting" sizes.
Move the cow field between wire_count and hold_count. This is the
position that is 64-bit aligned and makes sure that the valid and
dirty fields are also 64-bit aligned. This means that if PAGE_SIZE
is 32K, the size of the vm_page structure is only increased by 8
bytes instead of 16 bytes. More importantly, the vm_page structure
is either 120 or 128 bytes on ia64. These are "interesting" sizes.

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