---
name: "pmap_page_exists_quick"
section: "9"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/pmap_page_exists_quick"
---

# pmap\_page\_exists\_quick(9)

determine if a page exists in a physical map

## 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)](/pmap/9.md)

## AUTHORS

This manual page was written by Bruce M Simpson ⟨bms@spc.org⟩.