pmap_page_exists_quick9
Determine if a page exists in a physical map
Usage
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
bool
pmap_page_exists_quick(pmap_t pmap, vm_page_t m);
Overview
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.
Releases
54 releases since FreeBSD 5.2-RELEASE; the text changed 35 times.