NAME
vm_page_wire,
vm_page_unwire,
vm_page_unwire_noq —
wire and unwire pages
SYNOPSIS
#include
<sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
void
vm_page_wire(vm_page_t
m);
bool
vm_page_wire_mapped(vm_page_t
m);
void
vm_page_unwire(vm_page_t
m, int queue);
bool
vm_page_unwire_noq(vm_page_t
m);
DESCRIPTION
Thevm_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.
AUTHORS
This manual page was written by Chad David <davidc@acns.ab.ca>.