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vm_page_wire, vm_page_unwire — wire and unwire pages
vm_page_unwire(vm_page_t m, int activate);
The vm_page_wire() function increments the wire count on a page, and
removes it from whatever queue it is on.
The vm_page_unwire() function releases one of the wirings on the page.
When write_count reaches zero the page is placed back onto either the
active queue (if activate is non-zero) or onto the inactive queue (if
activate is zero). If the page is unmanaged (PG_UNMANAGED is set) then
the page is left on PQ_NONE.
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