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/* $NetBSD: swap.c,v 1.4 1995/08/31 22:20:19 jtc Exp $ */
/*-
* Copyright (c) 1980, 1992, 1993
* The 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.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)swap.c 8.3 (Berkeley) 4/29/95";
#endif
static char rcsid[] = "$NetBSD: swap.c,v 1.4 1995/08/31 22:20:19 jtc Exp $";
#endif /* not lint */
/*
* swapinfo - based on a program of the same name by Kevin Lahey
*/
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/map.h>
#include <sys/stat.h>
#include <kvm.h>
#include <nlist.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "systat.h"
#include "extern.h"
extern char *getbsize __P((int *headerlenp, long *blocksizep));
void showspace __P((char *header, int hlen, long blocksize));
kvm_t *kd;
struct nlist syms[] = {
{ "_swapmap" }, /* list of free swap areas */
#define VM_SWAPMAP 0
{ "_nswapmap" },/* size of the swap map */
#define VM_NSWAPMAP 1
{ "_swdevt" }, /* list of swap devices and sizes */
#define VM_SWDEVT 2
{ "_nswap" }, /* size of largest swap device */
#define VM_NSWAP 3
{ "_nswdev" }, /* number of swap devices */
#define VM_NSWDEV 4
{ "_dmmax" }, /* maximum size of a swap block */
#define VM_DMMAX 5
0
};
static int nswap, nswdev, dmmax, nswapmap;
static struct swdevt *sw;
static long *perdev, blocksize;
static struct map *swapmap, *kswapmap;
static struct mapent *mp;
static int nfree, hlen;
#define SVAR(var) __STRING(var) /* to force expansion */
#define KGET(idx, var) \
KGET1(idx, &var, sizeof(var), SVAR(var))
#define KGET1(idx, p, s, msg) \
KGET2(syms[idx].n_value, p, s, msg)
#define KGET2(addr, p, s, msg) \
if (kvm_read(kd, addr, p, s) != s) { \
error("cannot read %s: %s", msg, kvm_geterr(kd)); \
return (0); \
}
WINDOW *
openswap()
{
return (subwin(stdscr, LINES-5-1, 0, 5, 0));
}
void
closeswap(w)
WINDOW *w;
{
if (w == NULL)
return;
wclear(w);
wrefresh(w);
delwin(w);
}
initswap()
{
int i;
char msgbuf[BUFSIZ];
static int once = 0;
if (once)
return (1);
if (kvm_nlist(kd, syms)) {
strcpy(msgbuf, "systat: swap: cannot find");
for (i = 0; syms[i].n_name != NULL; i++) {
if (syms[i].n_value == 0) {
strcat(msgbuf, " ");
strcat(msgbuf, syms[i].n_name);
}
}
error(msgbuf);
return (0);
}
KGET(VM_NSWAP, nswap);
KGET(VM_NSWDEV, nswdev);
KGET(VM_DMMAX, dmmax);
KGET(VM_NSWAPMAP, nswapmap);
KGET(VM_SWAPMAP, kswapmap); /* kernel `swapmap' is a pointer */
if ((sw = malloc(nswdev * sizeof(*sw))) == NULL ||
(perdev = malloc(nswdev * sizeof(*perdev))) == NULL ||
(mp = malloc(nswapmap * sizeof(*mp))) == NULL) {
error("swap malloc");
return (0);
}
KGET1(VM_SWDEVT, sw, nswdev * sizeof(*sw), "swdevt");
once = 1;
return (1);
}
void
fetchswap()
{
int s, e, i;
s = nswapmap * sizeof(*mp);
if (kvm_read(kd, (long)kswapmap, mp, s) != s)
error("cannot read swapmap: %s", kvm_geterr(kd));
/* first entry in map is `struct map'; rest are mapent's */
swapmap = (struct map *)mp;
if (nswapmap != swapmap->m_limit - (struct mapent *)kswapmap)
error("panic: swap: nswapmap goof");
/*
* Count up swap space.
*/
nfree = 0;
bzero(perdev, nswdev * sizeof(*perdev));
for (mp++; mp->m_addr != 0; mp++) {
s = mp->m_addr; /* start of swap region */
e = mp->m_addr + mp->m_size; /* end of region */
nfree += mp->m_size;
/*
* Swap space is split up among the configured disks.
* The first dmmax blocks of swap space some from the
* first disk, the next dmmax blocks from the next,
* and so on. The list of free space joins adjacent
* free blocks, ignoring device boundries. If we want
* to keep track of this information per device, we'll
* just have to extract it ourselves.
*/
/* calculate first device on which this falls */
i = (s / dmmax) % nswdev;
while (s < e) { /* XXX this is inefficient */
int bound = roundup(s + 1, dmmax);
if (bound > e)
bound = e;
perdev[i] += bound - s;
if (++i >= nswdev)
i = 0;
s = bound;
}
}
}
void
labelswap()
{
char *header, *p;
int row, i;
row = 0;
wmove(wnd, row, 0); wclrtobot(wnd);
header = getbsize(&hlen, &blocksize);
mvwprintw(wnd, row++, 0, "%-5s%*s%9s %55s",
"Disk", hlen, header, "Used",
"/0% /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%");
for (i = 0; i < nswdev; i++) {
p = devname(sw[i].sw_dev, S_IFBLK);
mvwprintw(wnd, i + 1, 0, "%-5s", p == NULL ? "??" : p);
}
}
void
showswap()
{
int col, row, div, i, j, avail, npfree, used, xsize, xfree;
div = blocksize / 512;
avail = npfree = 0;
for (i = 0; i < nswdev; i++) {
col = 5;
mvwprintw(wnd, i + 1, col, "%*d", hlen, sw[i].sw_nblks / div);
col += hlen;
/*
* Don't report statistics for partitions which have not
* yet been activated via swapon(8).
*/
if (!sw[i].sw_freed) {
mvwprintw(wnd, i + 1, col + 8,
"0 *** not available for swapping ***");
continue;
}
xsize = sw[i].sw_nblks;
xfree = perdev[i];
used = xsize - xfree;
mvwprintw(wnd, i + 1, col, "%9d ", used / div);
for (j = (100 * used / xsize + 1) / 2; j > 0; j--)
waddch(wnd, 'X');
npfree++;
avail += xsize;
}
/*
* If only one partition has been set up via swapon(8), we don't
* need to bother with totals.
*/
if (npfree > 1) {
used = avail - nfree;
mvwprintw(wnd, i + 1, 0, "%-5s%*d%9d ",
"Total", hlen, avail / div, used / div);
for (j = (100 * used / avail + 1) / 2; j > 0; j--)
waddch(wnd, 'X');
}
}
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