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>.

Debian                                            July 21, 2003                        PMAP_PAGE_EXISTS_QUICK(9)