pmap_page_exists_quick (9)

Leading comments

Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
All rights reserved.

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(The comments found at the beginning of the groff file "man9/pmap_page_exists_quick.9freebsd".)

NAME

pmap_page_exists_quick - determine if a page exists in a physical map

SYNOPSIS

In sys/param.h In vm/vm.h In vm/pmap.h Ft boolean_t Fn pmap_page_exists_quick pmap_t pmap vm_page_t m

DESCRIPTION

The Fn 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 Fn 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 .

SEE ALSO

pmap(9)

AUTHORS

This manual page was written by An Bruce M Simpson Aq bms@spc.org .