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pmap_page_exists_quick (9)

>> pmap_page_exists_quick (9) ( FreeBSD man: Ядро )

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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 Fa m exists in the physical map Fa 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 Fa pmap is one of the first 16 PVs linked from the page Fa m .