Annotation of src/usr.bin/vmstat/dkstats.c, Revision 1.15
1.15 ! millert 1: /* $OpenBSD: dkstats.c,v 1.14 2001/07/21 09:21:56 deraadt Exp $ */
1.2 deraadt 2: /* $NetBSD: dkstats.c,v 1.1 1996/05/10 23:19:27 thorpej Exp $ */
1.1 tholo 3:
4: /*
1.2 deraadt 5: * Copyright (c) 1996 John M. Vinopal
1.1 tholo 6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed for the NetBSD Project
19: * by John M. Vinopal.
20: * 4. The name of the author may not be used to endorse or promote products
21: * derived from this software without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
28: * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29: * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30: * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31: * 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:
1.10 angelos 36: #include <sys/param.h>
1.1 tholo 37: #include <sys/dkstat.h>
38: #include <sys/time.h>
39: #include <sys/disk.h>
1.10 angelos 40: #include <sys/sysctl.h>
41: #include <sys/tty.h>
1.1 tholo 42:
43: #include <err.h>
44: #include <fcntl.h>
45: #include <kvm.h>
46: #include <limits.h>
47: #include <nlist.h>
48: #include <stdio.h>
49: #include <stdlib.h>
50: #include <string.h>
51: #include <unistd.h>
52: #include "dkstats.h"
53:
54: static struct nlist namelist[] = {
55: #define X_TK_NIN 0
56: { "_tk_nin" }, /* tty characters in */
57: #define X_TK_NOUT 1
58: { "_tk_nout" }, /* tty characters out */
59: #define X_CP_TIME 2
60: { "_cp_time" }, /* system timer ticks */
61: #define X_HZ 3
62: { "_hz" }, /* ticks per second */
63: #define X_STATHZ 4
64: { "_stathz" },
65: #define X_DISK_COUNT 5
66: { "_disk_count" }, /* number of disks */
67: #define X_DISKLIST 6
68: { "_disklist" }, /* TAILQ of disks */
69: { NULL },
70: };
71:
72: /* Structures to hold the statistics. */
73: struct _disk cur, last;
74:
75: /* Kernel pointers: nlistf and memf defined in calling program. */
76: static kvm_t *kd = NULL;
77: extern char *nlistf;
78: extern char *memf;
79:
80: /* Pointer to list of disks. */
81: static struct disk *dk_drivehead = NULL;
82:
83: /* Backward compatibility references. */
84: int dk_ndrive = 0;
85: int *dk_select;
86: char **dr_name;
87:
88: #define KVM_ERROR(_string) { \
1.8 aaron 89: warnx("%s", (_string)); \
1.7 millert 90: errx(1, "%s", kvm_geterr(kd)); \
1.1 tholo 91: }
92:
93: /*
94: * Dereference the namelist pointer `v' and fill in the local copy
95: * 'p' which is of size 's'.
96: */
97: #define deref_nl(v, p, s) deref_kptr((void *)namelist[(v)].n_value, (p), (s));
98:
99: /* Missing from <sys/time.h> */
100: #define timerset(tvp, uvp) ((uvp)->tv_sec = (tvp)->tv_sec); \
101: ((uvp)->tv_usec = (tvp)->tv_usec)
102:
1.15 ! millert 103: static void deref_kptr(void *, void *, size_t);
1.1 tholo 104:
105: /*
106: * Take the delta between the present values and the last recorded
107: * values, storing the present values in the 'last' structure, and
108: * the delta values in the 'cur' structure.
109: */
110: void
111: dkswap()
112: {
113: #define SWAP(fld) tmp = cur.fld; \
114: cur.fld -= last.fld; \
115: last.fld = tmp
116: u_int64_t tmp;
117: int i;
118:
119: for (i = 0; i < dk_ndrive; i++) {
120: struct timeval tmp_timer;
121:
122: if (!cur.dk_select[i])
123: continue;
124:
125: /* Delta Values. */
126: SWAP(dk_xfer[i]);
127: SWAP(dk_seek[i]);
128: SWAP(dk_bytes[i]);
129:
130: /* Delta Time. */
131: timerclear(&tmp_timer);
132: timerset(&(cur.dk_time[i]), &tmp_timer);
133: timersub(&tmp_timer, &(last.dk_time[i]), &(cur.dk_time[i]));
134: timerclear(&(last.dk_time[i]));
135: timerset(&tmp_timer, &(last.dk_time[i]));
136: }
137: for (i = 0; i < CPUSTATES; i++) {
138: SWAP(cp_time[i]);
139: }
140: SWAP(tk_nin);
141: SWAP(tk_nout);
142:
143: #undef SWAP
144: }
145:
146: /*
147: * Read the disk statistics for each disk in the disk list.
148: * Also collect statistics for tty i/o and cpu ticks.
149: */
150: void
151: dkreadstats()
152: {
153: struct disk cur_disk, *p;
1.10 angelos 154: int i, mib[3];
155: size_t size;
1.13 angelos 156: struct diskstats *q;
1.1 tholo 157:
1.10 angelos 158: if (nlistf == NULL && memf == NULL) {
1.13 angelos 159: size = dk_ndrive * sizeof(struct diskstats);
1.10 angelos 160: mib[0] = CTL_HW;
161: mib[1] = HW_DISKSTATS;
1.13 angelos 162: q = malloc(size);
163: if (q == NULL)
1.10 angelos 164: err(1, NULL);
1.13 angelos 165: if (sysctl(mib, 2, q, &size, NULL, 0) < 0) {
1.10 angelos 166: warn("could not read hw.diskstats");
1.14 deraadt 167: bzero(q, dk_ndrive * sizeof(struct diskstats));
1.10 angelos 168: }
169:
170: for (i = 0; i < dk_ndrive; i++) {
1.13 angelos 171: cur.dk_xfer[i] = q[i].ds_xfer;
172: cur.dk_seek[i] = q[i].ds_seek;
173: cur.dk_bytes[i] = q[i].ds_bytes;
174: timerset(&(q[i].ds_time), &(cur.dk_time[i]));
1.10 angelos 175: }
1.14 deraadt 176: free(q);
1.10 angelos 177:
178: size = sizeof(cur.cp_time);
179: mib[0] = CTL_KERN;
180: mib[1] = KERN_CPTIME;
181: if (sysctl(mib, 2, cur.cp_time, &size, NULL, 0) < 0) {
1.11 angelos 182: warn("could not read kern.cp_time");
1.10 angelos 183: bzero(cur.cp_time, sizeof(cur.cp_time));
184: }
185: size = sizeof(cur.tk_nin);
186: mib[0] = CTL_KERN;
187: mib[1] = KERN_TTY;
188: mib[2] = KERN_TTY_TKNIN;
189: if (sysctl(mib, 3, &cur.tk_nin, &size, NULL, 0) < 0) {
1.11 angelos 190: warn("could not read kern.tty.tk_nin");
1.10 angelos 191: cur.tk_nin = 0;
192: }
193: size = sizeof(cur.tk_nin);
194: mib[0] = CTL_KERN;
195: mib[1] = KERN_TTY;
196: mib[2] = KERN_TTY_TKNOUT;
197: if (sysctl(mib, 3, &cur.tk_nout, &size, NULL, 0) < 0) {
1.11 angelos 198: warn("could not read kern.tty.tk_nout");
1.10 angelos 199: cur.tk_nout = 0;
200: }
201: } else {
202: p = dk_drivehead;
203:
204: for (i = 0; i < dk_ndrive; i++) {
205: deref_kptr(p, &cur_disk, sizeof(cur_disk));
206: cur.dk_xfer[i] = cur_disk.dk_xfer;
207: cur.dk_seek[i] = cur_disk.dk_seek;
208: cur.dk_bytes[i] = cur_disk.dk_bytes;
209: timerset(&(cur_disk.dk_time), &(cur.dk_time[i]));
210: p = cur_disk.dk_link.tqe_next;
211: }
212:
213: deref_nl(X_CP_TIME, cur.cp_time, sizeof(cur.cp_time));
214: deref_nl(X_TK_NIN, &cur.tk_nin, sizeof(cur.tk_nin));
215: deref_nl(X_TK_NOUT, &cur.tk_nout, sizeof(cur.tk_nout));
1.1 tholo 216: }
217: }
218:
219: /*
220: * Perform all of the initialization and memory allocation needed to
221: * track disk statistics.
222: */
223: int
224: dkinit(select)
225: int select;
226: {
227: struct disklist_head disk_head;
228: struct disk cur_disk, *p;
229: char errbuf[_POSIX2_LINE_MAX];
230: static int once = 0;
231: extern int hz;
1.10 angelos 232: int i, mib[2];
233: size_t size;
234: struct clockinfo clkinfo;
235: char *disknames, *name, *bufpp;
1.1 tholo 236:
237: if (once)
238: return(1);
239:
1.10 angelos 240: if (nlistf != NULL || memf != NULL) {
241: /* Open the kernel. */
242: if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY,
243: errbuf)) == NULL)
244: errx(1, "kvm_openfiles: %s", errbuf);
245:
246: /* Obtain the namelist symbols from the kernel. */
247: if (kvm_nlist(kd, namelist))
248: KVM_ERROR("kvm_nlist failed to read symbols.");
249:
250: /* Get the number of attached drives. */
251: deref_nl(X_DISK_COUNT, &dk_ndrive, sizeof(dk_ndrive));
252:
253: if (dk_ndrive < 0)
254: errx(1, "invalid _disk_count %d.", dk_ndrive);
255:
1.1 tholo 256: /* Get a pointer to the first disk. */
257: deref_nl(X_DISKLIST, &disk_head, sizeof(disk_head));
258: dk_drivehead = disk_head.tqh_first;
1.10 angelos 259:
260: /* Get ticks per second. */
261: deref_nl(X_STATHZ, &hz, sizeof(hz));
262: if (!hz)
263: deref_nl(X_HZ, &hz, sizeof(hz));
264: } else {
265: /* Get the number of attached drives. */
266: mib[0] = CTL_HW;
267: mib[1] = HW_DISKCOUNT;
268: size = sizeof(dk_ndrive);
269: if (sysctl(mib, 2, &dk_ndrive, &size, NULL, 0) < 0 ) {
1.11 angelos 270: warn("could not read hw.diskcount");
1.10 angelos 271: dk_ndrive = 0;
272: }
273:
274: /* Get ticks per second. */
275: mib[0] = CTL_KERN;
276: mib[1] = KERN_CLOCKRATE;
277: size = sizeof(clkinfo);
278: if (sysctl(mib, 2, &clkinfo, &size, NULL, 0) < 0) {
1.11 angelos 279: warn("could not read kern.clockrate");
1.10 angelos 280: hz = 0;
281: } else
282: hz = clkinfo.stathz;
1.1 tholo 283: }
284:
285: /* allocate space for the statistics */
286: cur.dk_time = calloc(dk_ndrive, sizeof(struct timeval));
287: cur.dk_xfer = calloc(dk_ndrive, sizeof(u_int64_t));
288: cur.dk_seek = calloc(dk_ndrive, sizeof(u_int64_t));
289: cur.dk_bytes = calloc(dk_ndrive, sizeof(u_int64_t));
290: last.dk_time = calloc(dk_ndrive, sizeof(struct timeval));
291: last.dk_xfer = calloc(dk_ndrive, sizeof(u_int64_t));
292: last.dk_seek = calloc(dk_ndrive, sizeof(u_int64_t));
293: last.dk_bytes = calloc(dk_ndrive, sizeof(u_int64_t));
294: cur.dk_select = calloc(dk_ndrive, sizeof(int));
295: cur.dk_name = calloc(dk_ndrive, sizeof(char *));
296:
1.9 deraadt 297: if (!cur.dk_time || !cur.dk_xfer || !cur.dk_seek || !cur.dk_bytes ||
298: !last.dk_time || !last.dk_xfer || !last.dk_seek ||
299: !last.dk_bytes || !cur.dk_select || !cur.dk_name)
1.1 tholo 300: errx(1, "Memory allocation failure.");
301:
302: /* Set up the compatibility interfaces. */
303: dk_select = cur.dk_select;
304: dr_name = cur.dk_name;
305:
306: /* Read the disk names and set intial selection. */
1.10 angelos 307: if (nlistf == NULL && memf == NULL) {
308: mib[0] = CTL_HW;
309: mib[1] = HW_DISKNAMES;
310: size = 0;
311: if (sysctl(mib, 2, NULL, &size, NULL, 0) < 0)
312: err(1, "can't get hw.disknames");
1.12 angelos 313: disknames = malloc(size);
1.10 angelos 314: if (disknames == NULL)
315: err(1, NULL);
316: if (sysctl(mib, 2, disknames, &size, NULL, 0) < 0)
317: err(1, "can't get hw.disknames");
318: bufpp = disknames;
319: i = 0;
320: while ((name = strsep(&bufpp, ",")) != NULL) {
321: cur.dk_name[i] = name;
322: cur.dk_select[i++] = select;
323: }
324: } else {
325: p = dk_drivehead;
326: for (i = 0; i < dk_ndrive; i++) {
327: char buf[10];
328: deref_kptr(p, &cur_disk, sizeof(cur_disk));
329: deref_kptr(cur_disk.dk_name, buf, sizeof(buf));
330: cur.dk_name[i] = strdup(buf);
331: if (!cur.dk_name[i])
332: errx(1, "Memory allocation failure.");
333: cur.dk_select[i] = select;
1.1 tholo 334:
1.10 angelos 335: p = cur_disk.dk_link.tqe_next;
336: }
1.1 tholo 337: }
338:
339: /* Never do this initalization again. */
340: once = 1;
341: return(1);
342: }
343:
344: /*
345: * Dereference the kernel pointer `kptr' and fill in the local copy
346: * pointed to by `ptr'. The storage space must be pre-allocated,
347: * and the size of the copy passed in `len'.
348: */
349: static void
350: deref_kptr(kptr, ptr, len)
351: void *kptr, *ptr;
352: size_t len;
353: {
354: char buf[128];
355:
1.6 art 356: if (kvm_read(kd, (u_long)kptr, ptr, len) != len) {
1.1 tholo 357: bzero(buf, sizeof(buf));
358: snprintf(buf, (sizeof(buf) - 1),
1.2 deraadt 359: "can't dereference kptr 0x%lx", (u_long)kptr);
1.1 tholo 360: KVM_ERROR(buf);
361: }
362: }