pmap_page_exists_quick(9) debian man page | unix.com

PMAP_PAGE_EXISTS_QUICK(9)				   BSD Kernel Developer's Manual				 PMAP_PAGE_EXISTS_QUICK(9)

NAME
     pmap_page_exists_quick -- determine if a page exists in a physical map

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/pmap.h>

     boolean_t
     pmap_page_exists_quick(pmap_t pmap, vm_page_t m);

DESCRIPTION
     The pmap_page_exists_quick() function is used to quickly determine if the page m exists in the physical map pmap.	It is typically called
     from the VM paging code.

IMPLEMENTATION NOTES
     The PV count used above may be changed upwards or downwards in future; it is only necessary that TRUE be returned for a small subset of pmaps
     for proper page aging.

RETURN VALUES
     The pmap_page_exists_quick() returns TRUE only if the PV entry for the physical map pmap is one of the first 16 PVs linked from the page m.

SEE ALSO
     pmap(9)

AUTHORS
     This manual page was written by Bruce M Simpson <bms@spc.org>.

BSD
								   July 21, 2003							       BSD