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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〉.