The
vm_page_wire()
and
vm_page_wire_mapped()
functions wire the page, which prevents it from being reclaimed by the page
daemon or when its containing object is destroyed.
Both functions require that the page belong to an object.
The
vm_page_wire_mapped()
function is for use by the
pmap(9)
layer following a lookup.
This function may fail if mappings of the page are concurrently
being destroyed, in which case it will return false.
The
vm_page_unwire()
and
vm_page_unwire_noq()
functions release a wiring of a page.
The
vm_page_unwire()
function takes a queue index and will insert the page into the
corresponding page queue upon releasing its last wiring.
If the page does not belong to an object and no other references
to the page exist,
vm_page_unwire()
will free the page.
vm_page_unwire_noq()
releases the wiring and returns true if it was the last wiring
of the page.
