swapinfo(1) command from 1.1.5. This version has been modified to work
with the new libkvm interfaces.
This commit is contained in:
David Greenman
parent
40460a7a82
commit
e6692375a2
13
usr.sbin/swapinfo/Makefile
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13
usr.sbin/swapinfo/Makefile
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# @(#)Makefile 5.5 (Berkeley) 4/23/91
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PROG= swapinfo
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SRCS= swapinfo.c devname.c # getbsize.c
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.PATH: ${.CURDIR}/../../bin/df
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CFLAGS= -g
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DPADD= ${LIBMATH} ${LIBUTIL}
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LDADD= -lm -lkvm
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BINGRP= kmem
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BINMODE=2555
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.include <bsd.prog.mk>
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38
usr.sbin/swapinfo/README
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38
usr.sbin/swapinfo/README
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swapinfo
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========
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Swapinfo is designed to provide some information to the user about the
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state of the swap space on the system. I've written it based on a
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brief (!) perusal of the VM code in 386BSD. I could be pretty confused
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about how it all fits together, and perhaps this is totally bogus.
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It seems to work for me, though.
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How it works:
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During startup, the system traverses the list of configured swap partitions,
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and determines the size of the various partitions. As each new partition
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is added for swapping (via swapon), the free space on that disk is added
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to a linked list of free space. Adjacent areas are coalesced to form
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larger areas. The swapping algorithm seems to take the first free section
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that it finds [?].
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Swapinfo reads in the list of configured swap partitions from the /dev/kmem,
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to determine the size of the partitions. It then traverses the list
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of free space, figuring up how much is still available and how much
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has therefore been used. Things get a little hairy in that the swap space
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is divided amongst the configured swap partitions so that the first
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4096 blocks of swap go on the first swap partition, the second 4096 on
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the second swap partition, and so on. This works out to be a fairly
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simple bit of code, though.
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More caveats:
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This works on my system. Your milage may vary. Since I'm reading /dev/kmem
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to follow a linked list, the program could easily get lost looking for
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some free space if anything got changed between reads of /dev/kmem.
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If you get occasional inconsistant results, ignore 'em.
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Feel free to send bug reports, flames, etc., to:
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Kevin Lahey
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kml@rokkaku.atl.ga.us
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75
usr.sbin/swapinfo/devname.c
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75
usr.sbin/swapinfo/devname.c
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)devname.c 5.14 (Berkeley) 5/6/91";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <fcntl.h>
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#include <db.h>
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#include <stdio.h>
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#include <paths.h>
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char *
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devname(dev, type)
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dev_t dev;
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mode_t type;
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{
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struct {
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mode_t type;
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dev_t dev;
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} bkey;
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static DB *db;
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static int failure;
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DBT data, key;
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if (!db && !failure &&
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!(db = dbopen(_PATH_DEVDB, O_RDONLY, 0, DB_HASH, NULL))) {
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(void)fprintf(stderr,
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"warning: no device database %s\n", _PATH_DEVDB);
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failure = 1;
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}
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if (failure)
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return("??");
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/*
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* Keys are a mode_t followed by a dev_t. The former is the type of
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* the file (mode & S_IFMT), the latter is the st_rdev field.
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*/
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bkey.dev = dev;
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bkey.type = type;
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key.data = &bkey;
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key.size = sizeof(bkey);
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return((db->get)(db, &key, &data, 0L) ? "??" : (char *)data.data);
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}
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53
usr.sbin/swapinfo/swapinfo.1
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53
usr.sbin/swapinfo/swapinfo.1
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.\"
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.\" swapinfo
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.\"
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.Dd February 23, 1993
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.Dt SWAPINFO 1
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.Sh NAME
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.Nm swapinfo
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.Nd display free swap space
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.Sh SYNOPSIS
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.Nm swapinfo
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.Op Fl k
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.Sh DESCRIPTION
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.Nm Swapinfo
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displays statistics about the amount of free swap space on all of the
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swap areas compiled into the kernel.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl k
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By default, all sizes are reported in 512-byte block counts.
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The
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.Fl k
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option causes the numbers to be reported in kilobyte counts.
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.El
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.Sh STATISTICS
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Statistics are reported for all swap partitions configured into the kernel.
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The first column is the device name of the partition. The next column is
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the total space available in the partition. The
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.Ar Used
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column indicates the total blocks used so far; the
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.Ar Available
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column indicates how much space is remaining on each partition.
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The
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.Ar Capacity
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reports the percentage of space used.
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.Pp
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If more than one partition is configured into the system, totals for all
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of the statistics will be reported in the final line of the report.
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.Sh "BUGS AND CAVEATS"
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The information reported by
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.Nm swapinfo
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is stored in the kernel in a linked list. Since we are merely reading
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this list out of kernel memory, it is entirely possible that the list could
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change as we try to read it. Suspicious and unrepeatable values are probably
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incorrect.
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.Pp
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Statistics are reported for all swap partitions compiled into the kernel,
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regardless of whether those partitions are being used.
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.Sh AUTHOR
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.RS
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Kevin Lahey
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.br
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kml@rokkaku.atl.ga.us
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227
usr.sbin/swapinfo/swapinfo.c
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227
usr.sbin/swapinfo/swapinfo.c
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/*
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* swapinfo
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*
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* Swapinfo will provide some information about the state of the swap
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* space for the system. It'll determine the number of swap areas,
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* their original size, and their utilization.
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*
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* Kevin Lahey, February 16, 1993
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/termios.h>
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#include <sys/stat.h>
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#include <sys/tty.h>
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#include <sys/uio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/rlist.h>
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#include <nlist.h>
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#include <kvm.h>
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struct rlist *swapmap;
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static struct nlist nl[] = {{"_swapmap"}, /* list of free swap areas */
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#define VM_SWAPMAP 0
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{"_swdevt"}, /* list of swap devices and sizes */
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#define VM_SWDEVT 1
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{"_nswap"}, /* size of largest swap device */
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#define VM_NSWAP 2
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{"_nswdev"}, /* number of swap devices */
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#define VM_NSWDEV 3
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{"_dmmax"}, /* maximum size of a swap block */
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#define VM_DMMAX 4
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{""}};
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char *getbsize __P((int *, long *));
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void usage __P((void));
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int kflag;
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main (argc, argv)
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int argc;
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char **argv;
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{
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int i, total_avail, total_free, total_partitions, *by_device,
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nswap, nswdev, dmmax, ch;
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struct swdevt *swdevt;
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struct rlist head;
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static long blocksize;
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static int headerlen;
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static char *header;
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char **save;
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kvm_t *kd;
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/* We are trying to be simple here: */
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save = argv;
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kflag = 0;
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while ((ch = getopt(argc, argv, "k")) != EOF)
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switch(ch) {
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case 'k':
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kflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argv += optind;
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if (!*argv) {
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argv = save;
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argv[0] = ".";
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argv[1] = NULL;
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}
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/* Open up /dev/kmem for reading. */
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if ((kd = kvm_openfiles(NULL, NULL, NULL, NULL, NULL)) == (kvm_t *)0) {
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fprintf (stderr, "%s: kvm_openfiles: %s\n",
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argv [0], kvm_geterr(kd));
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exit (1);
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}
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/* Figure out the offset of the various structures we'll need. */
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if (kvm_nlist(kd, nl) == -1) {
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fprintf (stderr, "%s: kvm_nlist: %s\n",
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argv [0], kvm_geterr(kd));
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exit (1);
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}
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if (kvm_read(kd, nl[VM_NSWAP].n_value, &nswap, sizeof (nswap)) !=
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sizeof (nswap)) {
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fprintf (stderr, "%s: didn't read all of nswap\n",
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argv [0]);
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exit (5);
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}
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if (kvm_read(kd, nl[VM_NSWDEV].n_value, &nswdev, sizeof (nswdev)) !=
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sizeof (nswdev)) {
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fprintf (stderr, "%s: didn't read all of nswdev\n",
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argv [0]);
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exit (5);
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}
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if (kvm_read(kd, nl[VM_DMMAX].n_value, &dmmax, sizeof (dmmax)) !=
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sizeof (dmmax)) {
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fprintf (stderr, "%s: didn't read all of dmmax\n",
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argv [0]);
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exit (5);
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}
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if ((swdevt = malloc (sizeof (struct swdevt) * nswdev)) == NULL ||
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(by_device = calloc (sizeof (*by_device), nswdev)) == NULL) {
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perror ("malloc");
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exit (5);
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}
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if (kvm_read(kd, nl[VM_SWDEVT].n_value, swdevt,
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sizeof (struct swdevt) * nswdev) !=
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sizeof (struct swdevt) * nswdev) {
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fprintf (stderr, "%s: didn't read all of swdevt\n",
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argv [0]);
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exit (5);
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}
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if (kvm_read(kd, nl[0].n_value, &swapmap, sizeof (struct rlist *)) !=
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sizeof (struct rlist *)) {
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fprintf (stderr, "%s: didn't read all of swapmap\n",
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argv [0]);
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exit (5);
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}
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/* Traverse the list of free swap space... */
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total_free = 0;
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while (swapmap) {
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int top, bottom, next_block;
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if (kvm_read(kd, (long) swapmap, &head, sizeof (struct rlist )) !=
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sizeof (struct rlist )) {
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fprintf (stderr, "%s: didn't read all of head\n",
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argv [0]);
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exit (5);
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}
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top = head.rl_end;
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bottom = head.rl_start;
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total_free += top - bottom + 1;
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/*
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* Swap space is split up among the configured disk.
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* The first dmmax blocks of swap space some from the
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* first disk, the next dmmax blocks from the next,
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* and so on. The list of free space joins adjacent
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* free blocks, ignoring device boundries. If we want
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* to keep track of this information per device, we'll
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* just have to extract it ourselves.
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*/
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while (top / dmmax != bottom / dmmax) {
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next_block = ((bottom + dmmax) / dmmax);
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by_device [(bottom / dmmax) % nswdev] +=
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next_block * dmmax - bottom;
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bottom = next_block * dmmax;
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}
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by_device [(bottom / dmmax) % nswdev] +=
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top - bottom + 1;
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swapmap = head.rl_next;
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}
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header = getbsize(&headerlen, &blocksize);
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printf ("%-10s %10s %10s %10s %10s\n",
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"Device", header, "Used", "Available", "Capacity");
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for (total_avail = total_partitions = i = 0; i < nswdev; i++) {
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printf ("/dev/%-5s %10d ",
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devname (swdevt [i].sw_dev, S_IFBLK),
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swdevt [i].sw_nblks / (blocksize/512));
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/*
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* Don't report statistics for partitions which have not
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* yet been activated via swapon(8).
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*/
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if (!swdevt [i].sw_freed) {
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printf (" *** not available for swapping ***\n");
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} else {
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total_partitions++;
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total_avail += swdevt [i].sw_nblks;
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printf ("%10d %10d %7.0f%%\n",
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(swdevt [i].sw_nblks - by_device [i]) / (blocksize/512),
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by_device [i] / (blocksize/512),
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(double) (swdevt [i].sw_nblks -
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by_device [i]) /
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(double) swdevt [i].sw_nblks * 100.0);
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}
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}
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/*
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* If only one partition has been set up via swapon(8), we don't
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* need to bother with totals.
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*/
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if (total_partitions > 1)
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printf ("%-10s %10d %10d %10d %7.0f%%\n", "Total",
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total_avail / (blocksize/512),
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(total_avail - total_free) / (blocksize/512),
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total_free / (blocksize/512),
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(double) (total_avail - total_free) /
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(double) total_avail * 100.0);
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exit (0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: swapinfo [-k]\n");
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exit(1);
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}
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Loading…
Reference in New Issue
Block a user