---
name: "pmap_init2"
section: "9"
platform: "linux"
package: "freebsd-manpages"
version: "6.0-5"
release: "Debian 4.0 (Etch)"
platforms: ["linux"]
url: "https://new.carta.tech/pmap_init2"
---

# pmap\_init2(9)

initialize the pmap subsystem

## NAME

**pmap\_init**, **pmap\_init2** – initialize the pmap subsystem

## SYNOPSIS

**#include \<sys/param.h\>**

**#include \<vm/vm.h\>**

**#include \<vm/pmap.h\>**

*void*\

**pmap\_init**(*void*);

*void*\

**pmap\_init2**(*void*);

## DESCRIPTION

The **pmap\_init**() function initializes the [pmap(9)](/pmap/9.md) sub-system. It is called during system initialization by **vm\_init**(), to initialize any structures that the **pmap\_init** system needs in order to map between physical and virtual memory.

The **pmap\_init2**() function initializes a zone for the PV entries. These are used to implement page sharing at the physical level. A high water mark is set so that the system can recover from excessive numbers of PV entries.

## SEE ALSO

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

## AUTHORS

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