edc87d9db27cdf0f97165cda2955957b70ddeb55
[dragonfly.git] / usr.bin / vmstat / vmstat.c
1 /*
2  * Copyright (c) 1980, 1986, 1991, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *      This product includes software developed by the University of
16  *      California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * @(#) Copyright (c) 1980, 1986, 1991, 1993 The Regents of the University of California.  All rights reserved.
34  * @(#)vmstat.c 8.1 (Berkeley) 6/6/93
35  * $FreeBSD: src/usr.bin/vmstat/vmstat.c,v 1.38.2.4 2001/07/31 19:52:41 tmm Exp $
36  * $DragonFly: src/usr.bin/vmstat/vmstat.c,v 1.13 2004/10/25 22:01:06 liamfoy Exp $
37  */
38
39 #define _KERNEL_STRUCTURES
40
41 #include <sys/param.h>
42 #include <sys/time.h>
43 #include <sys/user.h>
44 #include <sys/dkstat.h>
45 #include <sys/uio.h>
46 #include <sys/namei.h>
47 #include <sys/malloc.h>
48 #include <sys/signal.h>
49 #include <sys/fcntl.h>
50 #include <sys/ioctl.h>
51 #include <sys/sysctl.h>
52 #include <sys/vmmeter.h>
53
54 #include <vm/vm_param.h>
55
56 #include <ctype.h>
57 #include <err.h>
58 #include <errno.h>
59 #include <kvm.h>
60 #include <limits.h>
61 #include <nlist.h>
62 #include <paths.h>
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <sysexits.h>
67 #include <time.h>
68 #include <unistd.h>
69 #include <devstat.h>
70
71 static struct nlist namelist[] = {
72 #define X_CPTIME        0
73         { "_cp_time" },
74 #define X_BOOTTIME      1
75         { "_boottime" },
76 #define X_HZ            2
77         { "_hz" },
78 #define X_STATHZ        3
79         { "_stathz" },
80 #define X_NCHSTATS      4
81         { "_nchstats" },
82 #define X_INTRNAMES     5
83         { "_intrnames" },
84 #define X_EINTRNAMES    6
85         { "_eintrnames" },
86 #define X_INTRCNT       7
87         { "_intrcnt" },
88 #define X_EINTRCNT      8
89         { "_eintrcnt" },
90 #define X_KMEMSTATISTICS        9
91         { "_kmemstatistics" },
92 #define X_ZLIST         10
93         { "_zlist" },
94 #ifdef notyet
95 #define X_DEFICIT       11
96         { "_deficit" },
97 #define X_FORKSTAT      12
98         { "_forkstat" },
99 #define X_REC           13
100         { "_rectime" },
101 #define X_PGIN          14
102         { "_pgintime" },
103 #define X_XSTATS        15
104         { "_xstats" },
105 #define X_END           16
106 #else
107 #define X_END           11
108 #endif
109         { "" },
110 };
111
112 struct statinfo cur, last;
113 int num_devices, maxshowdevs;
114 long generation;
115 struct device_selection *dev_select;
116 int num_selected;
117 struct devstat_match *matches;
118 int num_matches = 0;
119 int num_devices_specified, num_selections;
120 long select_generation;
121 char **specified_devices;
122 devstat_select_mode select_mode;
123
124 struct  vmmeter vmm, ovmm;
125 struct  vmstats vms, ovms;
126
127 int     winlines = 20;
128 int     nflag = 0;
129
130 kvm_t *kd;
131
132 #define FORKSTAT        0x01
133 #define INTRSTAT        0x02
134 #define MEMSTAT         0x04
135 #define SUMSTAT         0x08
136 #define TIMESTAT        0x10
137 #define VMSTAT          0x20
138 #define ZMEMSTAT        0x40
139
140 void    cpustats(), dointr(), domem(), dosum(), dozmem();
141 void    dovmstat(), kread(), usage();
142 #ifdef notyet
143 void    dotimes(), doforkst();
144 #endif
145 void printhdr(void);
146 static void devstats();
147
148 int
149 main(int argc, char **argv)
150 {
151         int c, todo;
152         u_int interval;
153         int reps;
154         char *memf, *nlistf;
155         char errbuf[_POSIX2_LINE_MAX];
156
157         memf = nlistf = NULL;
158         interval = reps = todo = 0;
159         maxshowdevs = 2;
160         while ((c = getopt(argc, argv, "c:fiM:mN:n:p:stw:z")) != -1) {
161                 switch (c) {
162                 case 'c':
163                         reps = atoi(optarg);
164                         break;
165                 case 'f':
166 #ifdef notyet
167                         todo |= FORKSTAT;
168 #else
169                         errx(EX_USAGE, "sorry, -f is not (re)implemented yet");
170 #endif
171                         break;
172                 case 'i':
173                         todo |= INTRSTAT;
174                         break;
175                 case 'M':
176                         memf = optarg;
177                         break;
178                 case 'm':
179                         todo |= MEMSTAT;
180                         break;
181                 case 'N':
182                         nlistf = optarg;
183                         break;
184                 case 'n':
185                         nflag = 1;
186                         maxshowdevs = atoi(optarg);
187                         if (maxshowdevs < 0)
188                                 errx(1, "number of devices %d is < 0",
189                                      maxshowdevs);
190                         break;
191                 case 'p':
192                         if (buildmatch(optarg, &matches, &num_matches) != 0)
193                                 errx(1, "%s", devstat_errbuf);
194                         break;
195                 case 's':
196                         todo |= SUMSTAT;
197                         break;
198                 case 't':
199 #ifdef notyet
200                         todo |= TIMESTAT;
201 #else
202                         errx(EX_USAGE, "sorry, -t is not (re)implemented yet");
203 #endif
204                         break;
205                 case 'w':
206                         interval = atoi(optarg);
207                         break;
208                 case 'z':
209                         todo |= ZMEMSTAT;
210                         break;
211                 case '?':
212                 default:
213                         usage();
214                 }
215         }
216         argc -= optind;
217         argv += optind;
218
219         if (todo == 0)
220                 todo = VMSTAT;
221
222         /*
223          * Discard setgid privileges if not the running kernel so that bad
224          * guys can't print interesting stuff from kernel memory.
225          */
226         if (nlistf != NULL || memf != NULL)
227                 setgid(getgid());
228
229         kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
230         if (kd == 0) 
231                 errx(1, "kvm_openfiles: %s", errbuf);
232
233         if ((c = kvm_nlist(kd, namelist)) != 0) {
234                 if (c > 0) {
235                         warnx("undefined symbols:");
236                         for (c = 0;
237                             c < sizeof(namelist)/sizeof(namelist[0]); c++)
238                                 if (namelist[c].n_type == 0)
239                                         fprintf(stderr, " %s",
240                                             namelist[c].n_name);
241                         fputc('\n', stderr);
242                 } else
243                         warnx("kvm_nlist: %s", kvm_geterr(kd));
244                 exit(1);
245         }
246
247         if (todo & VMSTAT) {
248                 char **getdrivedata();
249                 struct winsize winsize;
250
251                 /*
252                  * Make sure that the userland devstat version matches the
253                  * kernel devstat version.  If not, exit and print a
254                  * message informing the user of his mistake.
255                  */
256                 if (checkversion() < 0)
257                         errx(1, "%s", devstat_errbuf);
258
259
260                 argv = getdrivedata(argv);
261                 winsize.ws_row = 0;
262                 ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&winsize);
263                 if (winsize.ws_row > 0)
264                         winlines = winsize.ws_row;
265
266         }
267
268 #define BACKWARD_COMPATIBILITY
269 #ifdef  BACKWARD_COMPATIBILITY
270         if (*argv) {
271                 interval = atoi(*argv);
272                 if (*++argv)
273                         reps = atoi(*argv);
274         }
275 #endif
276
277         if (interval) {
278                 if (!reps)
279                         reps = -1;
280         } else if (reps)
281                 interval = 1;
282
283 #ifdef notyet
284         if (todo & FORKSTAT)
285                 doforkst();
286 #endif
287         if (todo & MEMSTAT)
288                 domem();
289         if (todo & ZMEMSTAT)
290                 dozmem();
291         if (todo & SUMSTAT)
292                 dosum();
293 #ifdef notyet
294         if (todo & TIMESTAT)
295                 dotimes();
296 #endif
297         if (todo & INTRSTAT)
298                 dointr();
299         if (todo & VMSTAT)
300                 dovmstat(interval, reps);
301         exit(0);
302 }
303
304 char **
305 getdrivedata(char **argv)
306 {
307         if ((num_devices = getnumdevs()) < 0)
308                 errx(1, "%s", devstat_errbuf);
309
310         cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
311         last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
312         bzero(cur.dinfo, sizeof(struct devinfo));
313         bzero(last.dinfo, sizeof(struct devinfo));
314
315         if (getdevs(&cur) == -1)
316                 errx(1, "%s", devstat_errbuf);
317
318         num_devices = cur.dinfo->numdevs;
319         generation = cur.dinfo->generation;
320
321         specified_devices = (char **)malloc(sizeof(char *));
322         for (num_devices_specified = 0; *argv; ++argv) {
323                 if (isdigit(**argv))
324                         break;
325                 num_devices_specified++;
326                 specified_devices = (char **)realloc(specified_devices,
327                                                      sizeof(char *) *
328                                                      num_devices_specified);
329                 specified_devices[num_devices_specified - 1] = *argv;
330         }
331         dev_select = NULL;
332
333         if (nflag == 0 && maxshowdevs < num_devices_specified)
334                         maxshowdevs = num_devices_specified;
335
336         /*
337          * People are generally only interested in disk statistics when
338          * they're running vmstat.  So, that's what we're going to give
339          * them if they don't specify anything by default.  We'll also give
340          * them any other random devices in the system so that we get to
341          * maxshowdevs devices, if that many devices exist.  If the user
342          * specifies devices on the command line, either through a pattern
343          * match or by naming them explicitly, we will give the user only
344          * those devices.
345          */
346         if ((num_devices_specified == 0) && (num_matches == 0)) {
347                 if (buildmatch("da", &matches, &num_matches) != 0)
348                         errx(1, "%s", devstat_errbuf);
349
350                 select_mode = DS_SELECT_ADD;
351         } else
352                 select_mode = DS_SELECT_ONLY;
353
354         /*
355          * At this point, selectdevs will almost surely indicate that the
356          * device list has changed, so we don't look for return values of 0
357          * or 1.  If we get back -1, though, there is an error.
358          */
359         if (selectdevs(&dev_select, &num_selected, &num_selections,
360                        &select_generation, generation, cur.dinfo->devices,
361                        num_devices, matches, num_matches, specified_devices,
362                        num_devices_specified, select_mode,
363                        maxshowdevs, 0) == -1)
364                 errx(1, "%s", devstat_errbuf);
365
366         return(argv);
367 }
368
369 long
370 getuptime(void)
371 {
372         static time_t now, boottime;
373         time_t uptime;
374
375         if (boottime == 0)
376                 kread(X_BOOTTIME, &boottime, sizeof(boottime));
377         time(&now);
378         uptime = now - boottime;
379         if (uptime <= 0 || uptime > 60*60*24*365*10)
380                 errx(1, "time makes no sense; namelist must be wrong");
381         return(uptime);
382 }
383
384 int     hz, hdrcnt;
385
386 void
387 dovmstat(u_int interval, int reps)
388 {
389         struct vmtotal total;
390         time_t uptime, halfuptime;
391         struct devinfo *tmp_dinfo;
392         void needhdr();
393         int vmm_size = sizeof(vmm);
394         int vms_size = sizeof(vms);
395         int vmt_size = sizeof(total);
396
397         uptime = getuptime();
398         halfuptime = uptime / 2;
399         signal(SIGCONT, needhdr);
400
401         if (namelist[X_STATHZ].n_type != 0 && namelist[X_STATHZ].n_value != 0)
402                 kread(X_STATHZ, &hz, sizeof(hz));
403         if (!hz)
404                 kread(X_HZ, &hz, sizeof(hz));
405
406         for (hdrcnt = 1;;) {
407                 if (!--hdrcnt)
408                         printhdr();
409                 kread(X_CPTIME, cur.cp_time, sizeof(cur.cp_time));
410
411                 tmp_dinfo = last.dinfo;
412                 last.dinfo = cur.dinfo;
413                 cur.dinfo = tmp_dinfo;
414                 last.busy_time = cur.busy_time;
415
416                 /*
417                  * Here what we want to do is refresh our device stats.
418                  * getdevs() returns 1 when the device list has changed.
419                  * If the device list has changed, we want to go through
420                  * the selection process again, in case a device that we
421                  * were previously displaying has gone away.
422                  */
423                 switch (getdevs(&cur)) {
424                 case -1:
425                         errx(1, "%s", devstat_errbuf);
426                         break;
427                 case 1: {
428                         int retval;
429
430                         num_devices = cur.dinfo->numdevs;
431                         generation = cur.dinfo->generation;
432
433                         retval = selectdevs(&dev_select, &num_selected,
434                                             &num_selections, &select_generation,
435                                             generation, cur.dinfo->devices,
436                                             num_devices, matches, num_matches,
437                                             specified_devices,
438                                             num_devices_specified, select_mode,
439                                             maxshowdevs, 0);
440                         switch (retval) {
441                         case -1:
442                                 errx(1, "%s", devstat_errbuf);
443                                 break;
444                         case 1:
445                                 printhdr();
446                                 break;
447                         default:
448                                 break;
449                         }
450                 }
451                 default:
452                         break;
453                 }
454
455                 if (sysctlbyname("vm.vmstats", &vms, &vms_size, NULL, 0)) {
456                         perror("sysctlbyname: vm.vmstats");
457                         exit(1);
458                 }
459                 if (sysctlbyname("vm.vmmeter", &vmm, &vmm_size, NULL, 0)) {
460                         perror("sysctlbyname: vm.vmmeter");
461                         exit(1);
462                 } 
463                 if (sysctlbyname("vm.vmtotal", &total, &vmt_size, NULL, 0)) {
464                         perror("sysctlbyname: vm.vmtotal");
465                         exit(1);
466                 } 
467                 printf("%2d %1d %1d",
468                     total.t_rq - 1, total.t_dw + total.t_pw, total.t_sw);
469 #define vmstat_pgtok(a) ((a) * vms.v_page_size >> 10)
470 #define rate(x) (((x) + halfuptime) / uptime)   /* round */
471                 printf(" %7ld %6ld ",
472                     (long)vmstat_pgtok(total.t_avm), (long)vmstat_pgtok(total.t_free));
473                 printf("%4lu ",
474                     (u_long)rate(vmm.v_vm_faults - ovmm.v_vm_faults));
475                 printf("%3lu ",
476                     (u_long)rate(vmm.v_reactivated - ovmm.v_reactivated));
477                 printf("%3lu ",
478                     (u_long)rate(vmm.v_swapin + vmm.v_vnodein -
479                     (ovmm.v_swapin + ovmm.v_vnodein)));
480                 printf("%3lu ",
481                     (u_long)rate(vmm.v_swapout + vmm.v_vnodeout -
482                     (ovmm.v_swapout + ovmm.v_vnodeout)));
483                 printf("%3lu ",
484                     (u_long)rate(vmm.v_tfree - ovmm.v_tfree));
485                 printf("%3lu ",
486                     (u_long)rate(vmm.v_pdpages - ovmm.v_pdpages));
487                 devstats();
488                 printf("%4lu %4lu %3lu ",
489                     (u_long)rate(vmm.v_intr - ovmm.v_intr),
490                     (u_long)rate(vmm.v_syscall - ovmm.v_syscall),
491                     (u_long)rate(vmm.v_swtch - ovmm.v_swtch));
492                 cpustats();
493                 printf("\n");
494                 fflush(stdout);
495                 if (reps >= 0 && --reps <= 0)
496                         break;
497                 ovmm = vmm;
498                 uptime = interval;
499                 /*
500                  * We round upward to avoid losing low-frequency events
501                  * (i.e., >= 1 per interval but < 1 per second).
502                  */
503                 if (interval != 1)
504                         halfuptime = (uptime + 1) / 2;
505                 else
506                         halfuptime = 0;
507                 sleep(interval);
508         }
509 }
510
511 void
512 printhdr(void)
513 {
514         int i, num_shown;
515
516         num_shown = (num_selected < maxshowdevs) ? num_selected : maxshowdevs;
517         printf(" procs      memory      page%*s", 19, "");
518         if (num_shown > 1)
519                 printf(" disks %*s", num_shown * 4 - 7, "");
520         else if (num_shown == 1)
521                 printf("disk");
522         printf("   faults      cpu\n");
523         printf(" r b w     avm    fre  flt  re  pi  po  fr  sr ");
524         for (i = 0; i < num_devices; i++)
525                 if ((dev_select[i].selected)
526                  && (dev_select[i].selected <= maxshowdevs))
527                         printf("%c%c%d ", dev_select[i].device_name[0],
528                                      dev_select[i].device_name[1],
529                                      dev_select[i].unit_number);
530         printf("  in   sy  cs us sy id\n");
531         hdrcnt = winlines - 2;
532 }
533
534 /*
535  * Force a header to be prepended to the next output.
536  */
537 void
538 needhdr(void)
539 {
540
541         hdrcnt = 1;
542 }
543
544 long
545 pct(long top, long bot)
546 {
547         long ans;
548
549         if (bot == 0)
550                 return(0);
551         ans = (quad_t)top * 100 / bot;
552         return (ans);
553 }
554
555 #define PCT(top, bot) pct((long)(top), (long)(bot))
556
557 void
558 dosum(void)
559 {
560         struct nchstats *nch_tmp, nchstats;
561         int vms_size = sizeof(vms);
562         int vmm_size = sizeof(vmm);
563         int cpucnt;
564         u_long nchtotal;
565         size_t nch_size = sizeof(struct nchstats) * SMP_MAXCPU;
566
567         if (sysctlbyname("vm.vmstats", &vms, &vms_size, NULL, 0)) {
568                 perror("sysctlbyname: vm.vmstats");
569                 exit(1);
570         }
571         if (sysctlbyname("vm.vmmeter", &vmm, &vmm_size, NULL, 0)) {
572                 perror("sysctlbyname: vm.vmstats");
573                 exit(1);
574         }
575         printf("%9u cpu context switches\n", vmm.v_swtch);
576         printf("%9u device interrupts\n", vmm.v_intr);
577         printf("%9u software interrupts\n", vmm.v_soft);
578         printf("%9u traps\n", vmm.v_trap);
579         printf("%9u system calls\n", vmm.v_syscall);
580         printf("%9u kernel threads created\n", vmm.v_kthreads);
581         printf("%9u  fork() calls\n", vmm.v_forks);
582         printf("%9u vfork() calls\n", vmm.v_vforks);
583         printf("%9u rfork() calls\n", vmm.v_rforks);
584         printf("%9u exec() calls\n", vmm.v_exec);
585         printf("%9u swap pager pageins\n", vmm.v_swapin);
586         printf("%9u swap pager pages paged in\n", vmm.v_swappgsin);
587         printf("%9u swap pager pageouts\n", vmm.v_swapout);
588         printf("%9u swap pager pages paged out\n", vmm.v_swappgsout);
589         printf("%9u vnode pager pageins\n", vmm.v_vnodein);
590         printf("%9u vnode pager pages paged in\n", vmm.v_vnodepgsin);
591         printf("%9u vnode pager pageouts\n", vmm.v_vnodeout);
592         printf("%9u vnode pager pages paged out\n", vmm.v_vnodepgsout);
593         printf("%9u page daemon wakeups\n", vmm.v_pdwakeups);
594         printf("%9u pages examined by the page daemon\n", vmm.v_pdpages);
595         printf("%9u pages reactivated\n", vmm.v_reactivated);
596         printf("%9u copy-on-write faults\n", vmm.v_cow_faults);
597         printf("%9u copy-on-write optimized faults\n", vmm.v_cow_optim);
598         printf("%9u zero fill pages zeroed\n", vmm.v_zfod);
599         printf("%9u zero fill pages prezeroed\n", vmm.v_ozfod);
600         printf("%9u intransit blocking page faults\n", vmm.v_intrans);
601         printf("%9u total VM faults taken\n", vmm.v_vm_faults);
602         printf("%9u pages affected by kernel thread creation\n", vmm.v_kthreadpages);
603         printf("%9u pages affected by  fork()\n", vmm.v_forkpages);
604         printf("%9u pages affected by vfork()\n", vmm.v_vforkpages);
605         printf("%9u pages affected by rfork()\n", vmm.v_rforkpages);
606         printf("%9u pages freed\n", vmm.v_tfree);
607         printf("%9u pages freed by daemon\n", vmm.v_dfree);
608         printf("%9u pages freed by exiting processes\n", vmm.v_pfree);
609         printf("%9u pages active\n", vms.v_active_count);
610         printf("%9u pages inactive\n", vms.v_inactive_count);
611         printf("%9u pages in VM cache\n", vms.v_cache_count);
612         printf("%9u pages wired down\n", vms.v_wire_count);
613         printf("%9u pages free\n", vms.v_free_count);
614         printf("%9u bytes per page\n", vms.v_page_size);
615         
616         if ((nch_tmp = malloc(nch_size)) == NULL) {
617                 perror("malloc");
618                 exit(1);
619         } else {
620                 if (sysctlbyname("vfs.cache.nchstats", nch_tmp, &nch_size, NULL, 0)) {
621                         perror("sysctlbyname vfs.cache.nchstats");
622                         free(nch_tmp);
623                         exit(1);
624                 } else {
625                         if ((nch_tmp = realloc(nch_tmp, nch_size)) == NULL) {
626                                 perror("realloc");
627                                 exit(1);
628                         }
629                 }
630         }
631         
632         cpucnt = nch_size / sizeof(struct nchstats);
633         kvm_nch_cpuagg(nch_tmp, &nchstats, cpucnt);
634
635         nchtotal = nchstats.ncs_goodhits + nchstats.ncs_neghits +
636             nchstats.ncs_badhits + nchstats.ncs_falsehits +
637             nchstats.ncs_miss + nchstats.ncs_long;
638         printf("%9ld total name lookups\n", nchtotal);
639         printf(
640             "%9s cache hits (%ld%% pos + %ld%% neg) system %ld%% per-directory\n",
641             "", PCT(nchstats.ncs_goodhits, nchtotal),
642             PCT(nchstats.ncs_neghits, nchtotal),
643             PCT(nchstats.ncs_pass2, nchtotal));
644         printf("%9s deletions %ld%%, falsehits %ld%%, toolong %ld%%\n", "",
645             PCT(nchstats.ncs_badhits, nchtotal),
646             PCT(nchstats.ncs_falsehits, nchtotal),
647             PCT(nchstats.ncs_long, nchtotal));
648         free(nch_tmp);
649 }
650
651 #ifdef notyet
652 void
653 doforkst(void)
654 {
655         struct forkstat fks;
656
657         kread(X_FORKSTAT, &fks, sizeof(struct forkstat));
658         printf("%d forks, %d pages, average %.2f\n",
659             fks.cntfork, fks.sizfork, (double)fks.sizfork / fks.cntfork);
660         printf("%d vforks, %d pages, average %.2f\n",
661             fks.cntvfork, fks.sizvfork, (double)fks.sizvfork / fks.cntvfork);
662 }
663 #endif
664
665 static void
666 devstats(void)
667 {
668         int dn, state;
669         long double transfers_per_second;
670         long double busy_seconds;
671         long tmp;
672         
673         for (state = 0; state < CPUSTATES; ++state) {
674                 tmp = cur.cp_time[state];
675                 cur.cp_time[state] -= last.cp_time[state];
676                 last.cp_time[state] = tmp;
677         }
678
679         busy_seconds = compute_etime(cur.busy_time, last.busy_time);
680
681         for (dn = 0; dn < num_devices; dn++) {
682                 int di;
683
684                 if ((dev_select[dn].selected == 0)
685                  || (dev_select[dn].selected > maxshowdevs))
686                         continue;
687
688                 di = dev_select[dn].position;
689
690                 if (compute_stats(&cur.dinfo->devices[di],
691                                   &last.dinfo->devices[di], busy_seconds,
692                                   NULL, NULL, NULL,
693                                   NULL, &transfers_per_second, NULL,
694                                   NULL, NULL) != 0)
695                         errx(1, "%s", devstat_errbuf);
696
697                 printf("%3.0Lf ", transfers_per_second);
698         }
699 }
700
701 void
702 cpustats(void)
703 {
704         int state;
705         double pct, total;
706
707         total = 0;
708         for (state = 0; state < CPUSTATES; ++state)
709                 total += cur.cp_time[state];
710         if (total)
711                 pct = 100 / total;
712         else
713                 pct = 0;
714         printf("%2.0f ", (cur.cp_time[CP_USER] +
715                                 cur.cp_time[CP_NICE]) * pct);
716         printf("%2.0f ", (cur.cp_time[CP_SYS] +
717                                 cur.cp_time[CP_INTR]) * pct);
718         printf("%2.0f", cur.cp_time[CP_IDLE] * pct);
719 }
720
721 void
722 dointr(void)
723 {
724         u_long *intrcnt, uptime;
725         u_int64_t inttotal;
726         int nintr, inamlen;
727         char *intrname;
728
729         uptime = getuptime();
730         nintr = namelist[X_EINTRCNT].n_value - namelist[X_INTRCNT].n_value;
731         inamlen =
732             namelist[X_EINTRNAMES].n_value - namelist[X_INTRNAMES].n_value;
733         intrcnt = malloc((size_t)nintr);
734         intrname = malloc((size_t)inamlen);
735         if (intrcnt == NULL || intrname == NULL)
736                 errx(1, "malloc");
737         kread(X_INTRCNT, intrcnt, (size_t)nintr);
738         kread(X_INTRNAMES, intrname, (size_t)inamlen);
739         printf("interrupt                   total       rate\n");
740         inttotal = 0;
741         nintr /= sizeof(long);
742         while (--nintr >= 0) {
743                 if (intrname[0] || *intrcnt) {
744                     printf("%-12s %20lu %10lu\n", intrname,
745                             *intrcnt, *intrcnt / uptime);
746                 }
747                 intrname += strlen(intrname) + 1;
748                 inttotal += *intrcnt++;
749         }
750         printf("Total        %20llu %10llu\n", inttotal,
751                         inttotal / (u_int64_t) uptime);
752 }
753
754 #define MAX_KMSTATS     200
755
756 static
757 long
758 cpuagg(long *ary)
759 {
760     int i;
761     long ttl;
762
763     for (i = ttl = 0; i < SMP_MAXCPU; ++i)
764         ttl += ary[i];
765     return(ttl);
766 }
767
768 void
769 domem(void)
770 {
771         struct malloc_type *ks;
772         int i, j;
773         int first, nkms;
774         long totuse = 0, totfree = 0, totreq = 0;
775         struct malloc_type kmemstats[MAX_KMSTATS], *kmsp;
776         char buf[1024];
777
778         kread(X_KMEMSTATISTICS, &kmsp, sizeof(kmsp));
779         for (nkms = 0; nkms < MAX_KMSTATS && kmsp != NULL; nkms++) {
780                 if (sizeof(kmemstats[0]) != kvm_read(kd, (u_long)kmsp,
781                     &kmemstats[nkms], sizeof(kmemstats[0])))
782                         err(1, "kvm_read(%p)", (void *)kmsp);
783                 if (sizeof(buf) !=  kvm_read(kd, 
784                     (u_long)kmemstats[nkms].ks_shortdesc, buf, sizeof(buf)))
785                         err(1, "kvm_read(%p)", 
786                             (void *)kmemstats[nkms].ks_shortdesc);
787                 buf[sizeof(buf) - 1] = '\0';
788                 kmemstats[nkms].ks_shortdesc = strdup(buf);
789                 kmsp = kmemstats[nkms].ks_next;
790         }
791         if (kmsp != NULL)
792                 warnx("truncated to the first %d memory types", nkms);
793
794         printf(
795             "\nMemory statistics by type                          Type  Kern\n");
796         printf(
797 "        Type  InUse MemUse HighUse  Limit Requests Limit Limit Size(s)\n");
798         for (i = 0, ks = &kmemstats[0]; i < nkms; i++, ks++) {
799                 if (ks->ks_calls == 0)
800                         continue;
801                 printf("%13s%6ld%6ldK%7ldK%6ldK%9lld%5u%6u",
802                     ks->ks_shortdesc,
803                     cpuagg(ks->ks_inuse), (cpuagg(ks->ks_memuse) + 1023) / 1024,
804                     (ks->ks_maxused + 1023) / 1024,
805                     (ks->ks_limit + 1023) / 1024, ks->ks_calls,
806                     ks->ks_limblocks, ks->ks_mapblocks);
807                 first = 1;
808                 for (j =  1 << MINBUCKET; j < 1 << (MINBUCKET + 16); j <<= 1) {
809                         if ((ks->ks_size & j) == 0)
810                                 continue;
811                         if (first)
812                                 printf("  ");
813                         else
814                                 printf(",");
815                         if(j<1024)
816                                 printf("%d",j);
817                         else
818                                 printf("%dK",j>>10);
819                         first = 0;
820                 }
821                 printf("\n");
822                 totuse += cpuagg(ks->ks_memuse);
823                 totreq += ks->ks_calls;
824         }
825         printf("\nMemory Totals:  In Use    Free    Requests\n");
826         printf("              %7ldK %6ldK    %8ld\n",
827              (totuse + 1023) / 1024, (totfree + 1023) / 1024, totreq);
828 }
829
830 void
831 dozmem(void)
832 {
833         char *buf;
834         size_t bufsize;
835
836         buf = NULL;
837         bufsize = 1024;
838         for (;;) {
839                 if ((buf = realloc(buf, bufsize)) == NULL)
840                         err(1, "realloc()");
841                 if (sysctlbyname("vm.zone", buf, &bufsize, 0, NULL) == 0)
842                         break;
843                 if (errno != ENOMEM)
844                         err(1, "sysctl()");
845                 bufsize *= 2;
846         }
847         buf[bufsize] = '\0'; /* play it safe */
848         printf("%s\n\n", buf);
849         free(buf);
850 }
851
852 /*
853  * kread reads something from the kernel, given its nlist index.
854  */
855 void
856 kread(int nlx, void *addr, size_t size)
857 {
858         char *sym;
859
860         if (namelist[nlx].n_type == 0 || namelist[nlx].n_value == 0) {
861                 sym = namelist[nlx].n_name;
862                 if (*sym == '_')
863                         ++sym;
864                 errx(1, "symbol %s not defined", sym);
865         }
866         if (kvm_read(kd, namelist[nlx].n_value, addr, size) != size) {
867                 sym = namelist[nlx].n_name;
868                 if (*sym == '_')
869                         ++sym;
870                 errx(1, "%s: %s", sym, kvm_geterr(kd));
871         }
872 }
873
874 void
875 usage(void)
876 {
877         fprintf(stderr, "%s%s",
878                 "usage: vmstat [-imsz] [-c count] [-M core] [-N system] [-w wait]\n",
879                 "              [-n devs] [disks]\n");
880         exit(1);
881 }