1993-03-21 12:45:37 +03:00
|
|
|
.\" Copyright (c) 1991 Regents of the University of California.
|
|
|
|
|
.\" All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
|
|
|
.\" must display the following acknowledgement:
|
|
|
|
|
.\" This product includes software developed by the University of
|
|
|
|
|
.\" California, Berkeley and its contributors.
|
|
|
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
|
|
|
.\" may be used to endorse or promote products derived from this software
|
|
|
|
|
.\" without specific prior written permission.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
1993-08-01 11:32:48 +04:00
|
|
|
.\" from: @(#)madvise.2 6.1 (Berkeley) 5/27/91
|
|
|
|
|
.\" $Id: madvise.2,v 1.2 1993/08/01 07:42:43 mycroft Exp $
|
1993-03-21 12:45:37 +03:00
|
|
|
.\"
|
|
|
|
|
.TH MADVISE 2 "May 27, 1991"
|
|
|
|
|
.UC 7
|
|
|
|
|
.SH NAME
|
|
|
|
|
madvise \- give advise about use of memory
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
.nf
|
|
|
|
|
madvise(addr, len, behav)
|
|
|
|
|
.B caddr_t addr;
|
|
|
|
|
.B int len, behav;
|
|
|
|
|
.fi
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
.PP
|
|
|
|
|
The \fImadvise\fP system call
|
|
|
|
|
allows a process that has knowledge of its memory behavior
|
|
|
|
|
to describe it to the system.
|
|
|
|
|
The known behaviors are given in \fI<sys/mman.h>\fP:
|
|
|
|
|
.DS
|
|
|
|
|
.ta \w'#define\ \ 'u +\w'MADV_SEQUENTIAL\ \ 'u +\w'00\ \ \ \ 'u
|
|
|
|
|
#define MADV_NORMAL 0 /* no further special treatment */
|
|
|
|
|
#define MADV_RANDOM 1 /* expect random page references */
|
|
|
|
|
#define MADV_SEQUENTIAL 2 /* expect sequential references */
|
|
|
|
|
#define MADV_WILLNEED 3 /* will need these pages */
|
|
|
|
|
#define MADV_DONTNEED 4 /* don't need these pages */
|
|
|
|
|
#define MADV_SPACEAVAIL 5 /* insure that resources are reserved */
|
|
|
|
|
.DE
|
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
|
msync.2, munmap.2, mprotect.2, madvise.2, mincore.2
|
