264 lines
7.1 KiB
C
264 lines
7.1 KiB
C
/* $NetBSD: swap.c,v 1.3 1995/04/29 05:54:53 cgd Exp $ */
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/*-
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* Copyright (c) 1980, 1992, 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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)swap.c 8.2 (Berkeley) 2/21/94";
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#endif
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static char rcsid[] = "$NetBSD: swap.c,v 1.3 1995/04/29 05:54:53 cgd Exp $";
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#endif /* not lint */
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/*
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* swapinfo - based on a program of the same name by Kevin Lahey
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*/
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#include <sys/param.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/ioctl.h>
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#include <sys/map.h>
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#include <sys/stat.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "systat.h"
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#include "extern.h"
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extern char *devname __P((int, int));
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extern char *getbsize __P((int *headerlenp, long *blocksizep));
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void showspace __P((char *header, int hlen, long blocksize));
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kvm_t *kd;
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struct nlist syms[] = {
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{ "_swapmap" }, /* list of free swap areas */
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#define VM_SWAPMAP 0
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{ "_nswapmap" },/* size of the swap map */
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#define VM_NSWAPMAP 1
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{ "_swdevt" }, /* list of swap devices and sizes */
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#define VM_SWDEVT 2
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{ "_nswap" }, /* size of largest swap device */
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#define VM_NSWAP 3
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{ "_nswdev" }, /* number of swap devices */
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#define VM_NSWDEV 4
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{ "_dmmax" }, /* maximum size of a swap block */
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#define VM_DMMAX 5
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0
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};
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static int nswap, nswdev, dmmax, nswapmap;
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static struct swdevt *sw;
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static long *perdev, blocksize;
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static struct map *swapmap, *kswapmap;
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static struct mapent *mp;
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static int nfree, hlen;
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#define SVAR(var) __STRING(var) /* to force expansion */
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#define KGET(idx, var) \
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KGET1(idx, &var, sizeof(var), SVAR(var))
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#define KGET1(idx, p, s, msg) \
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KGET2(syms[idx].n_value, p, s, msg)
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#define KGET2(addr, p, s, msg) \
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if (kvm_read(kd, addr, p, s) != s) { \
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error("cannot read %s: %s", msg, kvm_geterr(kd)); \
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return (0); \
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}
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WINDOW *
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openswap()
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{
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return (subwin(stdscr, LINES-5-1, 0, 5, 0));
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}
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void
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closeswap(w)
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WINDOW *w;
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{
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if (w == NULL)
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return;
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wclear(w);
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wrefresh(w);
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delwin(w);
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}
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initswap()
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{
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int i;
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char msgbuf[BUFSIZ];
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static int once = 0;
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if (once)
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return (1);
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if (kvm_nlist(kd, syms)) {
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strcpy(msgbuf, "systat: swap: cannot find");
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for (i = 0; syms[i].n_name != NULL; i++) {
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if (syms[i].n_value == 0) {
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strcat(msgbuf, " ");
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strcat(msgbuf, syms[i].n_name);
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}
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}
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error(msgbuf);
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return (0);
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}
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KGET(VM_NSWAP, nswap);
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KGET(VM_NSWDEV, nswdev);
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KGET(VM_DMMAX, dmmax);
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KGET(VM_NSWAPMAP, nswapmap);
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KGET(VM_SWAPMAP, kswapmap); /* kernel `swapmap' is a pointer */
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if ((sw = malloc(nswdev * sizeof(*sw))) == NULL ||
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(perdev = malloc(nswdev * sizeof(*perdev))) == NULL ||
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(mp = malloc(nswapmap * sizeof(*mp))) == NULL) {
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error("swap malloc");
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return (0);
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}
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KGET1(VM_SWDEVT, sw, nswdev * sizeof(*sw), "swdevt");
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once = 1;
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return (1);
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}
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void
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fetchswap()
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{
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int s, e, i;
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s = nswapmap * sizeof(*mp);
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if (kvm_read(kd, (long)kswapmap, mp, s) != s)
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error("cannot read swapmap: %s", kvm_geterr(kd));
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/* first entry in map is `struct map'; rest are mapent's */
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swapmap = (struct map *)mp;
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if (nswapmap != swapmap->m_limit - (struct mapent *)kswapmap)
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error("panic: swap: nswapmap goof");
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/*
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* Count up swap space.
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*/
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nfree = 0;
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bzero(perdev, nswdev * sizeof(*perdev));
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for (mp++; mp->m_addr != 0; mp++) {
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s = mp->m_addr; /* start of swap region */
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e = mp->m_addr + mp->m_size; /* end of region */
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nfree += mp->m_size;
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/*
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* Swap space is split up among the configured disks.
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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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/* calculate first device on which this falls */
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i = (s / dmmax) % nswdev;
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while (s < e) { /* XXX this is inefficient */
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int bound = roundup(s + 1, dmmax);
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if (bound > e)
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bound = e;
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perdev[i] += bound - s;
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if (++i >= nswdev)
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i = 0;
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s = bound;
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}
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}
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}
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void
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labelswap()
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{
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char *header;
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int row, i;
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row = 0;
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wmove(wnd, row, 0); wclrtobot(wnd);
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header = getbsize(&hlen, &blocksize);
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mvwprintw(wnd, row++, 0, "%-5s%*s%9s %55s",
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"Disk", hlen, header, "Used",
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"/0% /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%");
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for (i = 0; i < nswdev; i++) {
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mvwprintw(wnd, i + 1, 0, "%-5s",
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devname(sw[i].sw_dev, S_IFBLK));
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}
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}
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void
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showswap()
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{
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int col, row, div, i, j, avail, npfree, used, xsize, xfree;
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div = blocksize / 512;
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avail = npfree = 0;
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for (i = 0; i < nswdev; i++) {
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col = 5;
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mvwprintw(wnd, i + 1, col, "%*d", hlen, sw[i].sw_nblks / div);
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col += hlen;
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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 (!sw[i].sw_freed) {
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mvwprintw(wnd, i + 1, col + 8,
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"0 *** not available for swapping ***");
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continue;
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}
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xsize = sw[i].sw_nblks;
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xfree = perdev[i];
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used = xsize - xfree;
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mvwprintw(wnd, i + 1, col, "%9d ", used / div);
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for (j = (100 * used / xsize + 1) / 2; j > 0; j--)
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waddch(wnd, 'X');
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npfree++;
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avail += xsize;
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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 (npfree > 1) {
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used = avail - nfree;
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mvwprintw(wnd, i + 1, 0, "%-5s%*d%9d ",
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"Total", hlen, avail / div, used / div);
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for (j = (100 * used / avail + 1) / 2; j > 0; j--)
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waddch(wnd, 'X');
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}
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}
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