---
name: "pmap_page_exists_quick"
section: "9"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
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\>**

*bool*\

**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*⟩.