Annotation of src/usr.bin/systat/swap.c, Revision 1.3
1.3 ! deraadt 1: /* $NetBSD: swap.c,v 1.5 1996/05/10 23:16:38 thorpej Exp $ */
1.1 deraadt 2:
3: /*-
4: * Copyright (c) 1980, 1992, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)swap.c 8.3 (Berkeley) 4/29/95";
39: #endif
1.3 ! deraadt 40: static char rcsid[] = "$NetBSD: swap.c,v 1.5 1996/05/10 23:16:38 thorpej Exp $";
1.1 deraadt 41: #endif /* not lint */
42:
43: /*
44: * swapinfo - based on a program of the same name by Kevin Lahey
45: */
46:
47: #include <sys/param.h>
48: #include <sys/buf.h>
49: #include <sys/conf.h>
50: #include <sys/ioctl.h>
51: #include <sys/map.h>
52: #include <sys/stat.h>
53:
54: #include <kvm.h>
55: #include <nlist.h>
56: #include <stdio.h>
57: #include <stdlib.h>
58: #include <string.h>
59: #include <unistd.h>
60:
61: #include "systat.h"
62: #include "extern.h"
63:
64: extern char *getbsize __P((int *headerlenp, long *blocksizep));
65: void showspace __P((char *header, int hlen, long blocksize));
66:
67: struct nlist syms[] = {
68: { "_swapmap" }, /* list of free swap areas */
69: #define VM_SWAPMAP 0
70: { "_nswapmap" },/* size of the swap map */
71: #define VM_NSWAPMAP 1
72: { "_swdevt" }, /* list of swap devices and sizes */
73: #define VM_SWDEVT 2
74: { "_nswap" }, /* size of largest swap device */
75: #define VM_NSWAP 3
76: { "_nswdev" }, /* number of swap devices */
77: #define VM_NSWDEV 4
78: { "_dmmax" }, /* maximum size of a swap block */
79: #define VM_DMMAX 5
80: 0
81: };
82:
83: static int nswap, nswdev, dmmax, nswapmap;
84: static struct swdevt *sw;
85: static long *perdev, blocksize;
86: static struct map *swapmap, *kswapmap;
87: static struct mapent *mp;
88: static int nfree, hlen;
89:
90: #define SVAR(var) __STRING(var) /* to force expansion */
91: #define KGET(idx, var) \
92: KGET1(idx, &var, sizeof(var), SVAR(var))
93: #define KGET1(idx, p, s, msg) \
94: KGET2(syms[idx].n_value, p, s, msg)
95: #define KGET2(addr, p, s, msg) \
96: if (kvm_read(kd, addr, p, s) != s) { \
97: error("cannot read %s: %s", msg, kvm_geterr(kd)); \
98: return (0); \
99: }
100:
101: WINDOW *
102: openswap()
103: {
104: return (subwin(stdscr, LINES-5-1, 0, 5, 0));
105: }
106:
107: void
108: closeswap(w)
109: WINDOW *w;
110: {
111: if (w == NULL)
112: return;
113: wclear(w);
114: wrefresh(w);
115: delwin(w);
116: }
117:
118: initswap()
119: {
120: int i;
121: char msgbuf[BUFSIZ];
122: static int once = 0;
123:
124: if (once)
125: return (1);
126: if (kvm_nlist(kd, syms)) {
127: strcpy(msgbuf, "systat: swap: cannot find");
128: for (i = 0; syms[i].n_name != NULL; i++) {
129: if (syms[i].n_value == 0) {
130: strcat(msgbuf, " ");
131: strcat(msgbuf, syms[i].n_name);
132: }
133: }
134: error(msgbuf);
135: return (0);
136: }
137: KGET(VM_NSWAP, nswap);
138: KGET(VM_NSWDEV, nswdev);
139: KGET(VM_DMMAX, dmmax);
140: KGET(VM_NSWAPMAP, nswapmap);
141: KGET(VM_SWAPMAP, kswapmap); /* kernel `swapmap' is a pointer */
142: if ((sw = malloc(nswdev * sizeof(*sw))) == NULL ||
143: (perdev = malloc(nswdev * sizeof(*perdev))) == NULL ||
144: (mp = malloc(nswapmap * sizeof(*mp))) == NULL) {
145: error("swap malloc");
146: return (0);
147: }
148: KGET1(VM_SWDEVT, sw, nswdev * sizeof(*sw), "swdevt");
149: once = 1;
150: return (1);
151: }
152:
153: void
154: fetchswap()
155: {
156: int s, e, i;
157:
158: s = nswapmap * sizeof(*mp);
159: if (kvm_read(kd, (long)kswapmap, mp, s) != s)
160: error("cannot read swapmap: %s", kvm_geterr(kd));
161:
162: /* first entry in map is `struct map'; rest are mapent's */
163: swapmap = (struct map *)mp;
164: if (nswapmap != swapmap->m_limit - (struct mapent *)kswapmap)
165: error("panic: swap: nswapmap goof");
166:
167: /*
168: * Count up swap space.
169: */
170: nfree = 0;
171: bzero(perdev, nswdev * sizeof(*perdev));
172: for (mp++; mp->m_addr != 0; mp++) {
173: s = mp->m_addr; /* start of swap region */
174: e = mp->m_addr + mp->m_size; /* end of region */
175: nfree += mp->m_size;
176:
177: /*
178: * Swap space is split up among the configured disks.
179: * The first dmmax blocks of swap space some from the
180: * first disk, the next dmmax blocks from the next,
181: * and so on. The list of free space joins adjacent
182: * free blocks, ignoring device boundries. If we want
183: * to keep track of this information per device, we'll
184: * just have to extract it ourselves.
185: */
186:
187: /* calculate first device on which this falls */
188: i = (s / dmmax) % nswdev;
189: while (s < e) { /* XXX this is inefficient */
190: int bound = roundup(s + 1, dmmax);
191:
192: if (bound > e)
193: bound = e;
194: perdev[i] += bound - s;
195: if (++i >= nswdev)
196: i = 0;
197: s = bound;
198: }
199: }
200: }
201:
202: void
203: labelswap()
204: {
205: char *header, *p;
206: int row, i;
207:
208: row = 0;
209: wmove(wnd, row, 0); wclrtobot(wnd);
210: header = getbsize(&hlen, &blocksize);
211: mvwprintw(wnd, row++, 0, "%-5s%*s%9s %55s",
212: "Disk", hlen, header, "Used",
213: "/0% /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%");
214: for (i = 0; i < nswdev; i++) {
215: p = devname(sw[i].sw_dev, S_IFBLK);
216: mvwprintw(wnd, i + 1, 0, "%-5s", p == NULL ? "??" : p);
217: }
218: }
219:
220: void
221: showswap()
222: {
223: int col, row, div, i, j, avail, npfree, used, xsize, xfree;
224:
225: div = blocksize / 512;
226: avail = npfree = 0;
227: for (i = 0; i < nswdev; i++) {
228: col = 5;
229: mvwprintw(wnd, i + 1, col, "%*d", hlen, sw[i].sw_nblks / div);
230: col += hlen;
231: /*
232: * Don't report statistics for partitions which have not
233: * yet been activated via swapon(8).
234: */
235: if (!sw[i].sw_freed) {
236: mvwprintw(wnd, i + 1, col + 8,
237: "0 *** not available for swapping ***");
238: continue;
239: }
240: xsize = sw[i].sw_nblks;
241: xfree = perdev[i];
242: used = xsize - xfree;
243: mvwprintw(wnd, i + 1, col, "%9d ", used / div);
244: for (j = (100 * used / xsize + 1) / 2; j > 0; j--)
245: waddch(wnd, 'X');
246: npfree++;
247: avail += xsize;
248: }
249: /*
250: * If only one partition has been set up via swapon(8), we don't
251: * need to bother with totals.
252: */
253: if (npfree > 1) {
254: used = avail - nfree;
255: mvwprintw(wnd, i + 1, 0, "%-5s%*d%9d ",
256: "Total", hlen, avail / div, used / div);
257: for (j = (100 * used / avail + 1) / 2; j > 0; j--)
258: waddch(wnd, 'X');
259: }
260: }
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