vm_invalidatep Kernel Service

Purpose

Releases page frames in the specified range for a non-journaled persistent segment or client segment.

Syntax

#include <sys/types.h>
#include <sys/errno.h>
#include <sys/vmuser.h>

int vm_invalidatep ( sid, pfirst, npages)
vmid_t sid;
vpn_t pfirst;
ulong npages;

Parameters

Item	Description
sid	Identifies the base segment.
pfirst	The first page number within the range.
npages	The number of pages to invalidate starting from the pfirst value. All pages must be in the same segment.

Description

The vm_invalidatep kernel service routine discards any page frames associated with the virtual memory object in the specified page range.

If a page within the specified range is found in page-in or page-out state, then the thread is synchronously put to sleep until the page I/O completes. When the I/O is complete, any memory-resident page frame is then freed.

Note: The vm_invalidatep subroutine is not supported for use on large pages.

Execution Environment

The vm_invalidatep kernel service can be called from the process environment only.

This is intended for files, and might not be called for working storage segments.

Return Values

Item	Description
0	Indicates the completion of the invalidating operations.
EINVAL	Indicates one of the following errors: pfirst < 0. npages < 0. Page interval not in one segment. Invalid sid parameter. Invalid segment type.