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⟩.