a420c8119a
swapctl functionality. The idea is to create a swapctl command that is fairly close to the OpenBSD and NetBSD version. FreeBSD does not implement swap priority (and it would be a mistake if we did) so we didn't bother with that part of it. Submitted by: Eirik Nygaard <eirikn@bluezone.no> Augmented by: dillon (extensively) Reviewed by: David Schultz <dschultz@uclink.Berkeley.EDU>
159 lines
4.6 KiB
Groff
159 lines
4.6 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)swapon.8 8.1 (Berkeley) 6/5/93
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.\" $FreeBSD$
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.\"
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.Dd June 5, 1993
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.Dt SWAPON 8
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.Os
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.Sh NAME
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.Nm swapon , swapoff
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.Nd "specify devices for paging and swapping"
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.Sh SYNOPSIS
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.Nm swap[on|off]
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.Fl a
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.Nm swap[on|off]
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.Ar special_file ...
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.Nm swapctl
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.Fl lshk
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.Nm swapctl
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.Fl AU
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.Nm swapctl
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.Fl a
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.Ar special_file ...
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.Nm swapctl
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.Fl d
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.Ar special_file ...
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.Sh DESCRIPTION
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The
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.Nm swap[on,off,ctl]
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utilties are used to control swap devices in the system. At boot time all
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swap entries in
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.Pa /etc/fstab
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are added automatically when the system goes multi-user.
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Swap devices are interleaved and kernels are typically configured
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to handle a maximum of 4 swap devices. There is no priority mechanism.
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.Pp
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The
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.Nm swapon
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utility adds the specified swap devices to the system. If the
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.Fl a
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option is used, all swap devices in
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.Pa /etc/fstab
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will be added, unless their ``noauto'' option is also set.
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.Pp
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The
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.Nm swapoff
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utility removes the specified swap devices from the system. If the
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.Fl a
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option is used, all swap devices in
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.Pa /etc/fstab
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will be removed, unless their ``noauto'' option is also set.
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Note that
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.Nm swapoff
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will fail and refuse to remove a swap device if there is insufficient
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VM (memory + remaining swap devices) to run the system.
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.Nm Swapoff
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must move swapped pages out of the device being removed which could
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lead to high system loads for a period of time, depending on how
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much data has been swapped out to that device.
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.Pp
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The
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.Nm swapctl
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utility exists primarily for those familiar with other BSDs and may be
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used to add, remove, or list swap. Note that the
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.Fl a
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option is used diferently in
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.Nm swapctl
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and indicates that a specific list of devices should be added.
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The
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.Fl d
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option indicates that a specific list should be removed. The
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.Fl A
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and
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.Fl D
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options to
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.Nm swapctl
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operate on all swap entries in
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.Pa /etc/fstab
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which do not have their ``noauto'' option set.
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.Pp
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Swap information can be generated using the
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.Nm swapinfo
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program,
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.Nm pstat
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.Fl s ,
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or
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.Nm swapctl
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.Fl lshk .
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The
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.Nm swapctl
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utility has the following options for listing swap:
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.Bl -tag -width indent
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.It Fl l
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List the devices making up system swap.
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.It Fl s
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Print a summary line for system swap.
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.It Fl h
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Output values in megabytes.
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.It Fl k
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Output values in kilobytes.
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.Pp
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The BLOCKSIZE environment variable is used if not specifically
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overridden. 512 byte blocks are used by default.
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.El
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.Sh SEE ALSO
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.Xr swapon 2 ,
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.Xr fstab 5 ,
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.Xr init 8 ,
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.Xr mdconfig 8 ,
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.Xr pstat 8 ,
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.Xr rc 8
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.Sh FILES
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.Bl -tag -width "/dev/{ad,da}?s?b" -compact
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.It Pa /dev/{ad,da}?s?b
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standard paging devices
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.It Pa /dev/md?
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memory disk devices
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.It Pa /etc/fstab
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ASCII file system description table
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.El
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.Sh HISTORY
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The
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.Nm swapon
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utility appeared in
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.Bx 4.0 .
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The
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.Nm swapoff
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utility appeared in
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.Fx 5.0 .
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