d92e6a9b66d446b1dd56b2fe02b96cdaccd404c7
[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 1.23 2008/02/19 18:19:15 thomas 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/uio.h>
45 #include <sys/namei.h>
46 #include <sys/malloc.h>
47 #include <sys/signal.h>
48 #include <sys/fcntl.h>
49 #include <sys/ioctl.h>
50 #include <sys/sysctl.h>
51 #include <sys/vmmeter.h>
52
53 #include <vm/vm_param.h>
54
55 #include <ctype.h>
56 #include <err.h>
57 #include <errno.h>
58 #include <kinfo.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_BOOTTIME      0
73         { "_boottime",  0, 0, 0, 0 },
74 #define X_NCHSTATS      1
75         { "_nchstats",  0, 0, 0, 0 },
76 #define X_KMEMSTATISTICS        2
77         { "_kmemstatistics",    0, 0, 0, 0 },
78 #define X_ZLIST         3
79         { "_zlist",     0, 0, 0, 0 },
80 #ifdef notyet
81 #define X_DEFICIT       4
82         { "_deficit",   0, 0, 0, 0 },
83 #define X_FORKSTAT      5
84         { "_forkstat",  0, 0, 0, 0 },
85 #define X_REC           6
86         { "_rectime",   0, 0, 0, 0 },
87 #define X_PGIN          7
88         { "_pgintime",  0, 0, 0, 0 },
89 #define X_XSTATS        8
90         { "_xstats",    0, 0, 0, 0 },
91 #define X_END           9
92 #else
93 #define X_END           4
94 #endif
95         { "", 0, 0, 0, 0 },
96 };
97
98 struct statinfo cur, last;
99 int num_devices, maxshowdevs;
100 long generation;
101 struct device_selection *dev_select;
102 int num_selected;
103 struct devstat_match *matches;
104 int num_matches = 0;
105 int num_devices_specified, num_selections;
106 long select_generation;
107 char **specified_devices;
108 devstat_select_mode select_mode;
109
110 struct  vmmeter vmm, ovmm;
111 struct  vmstats vms, ovms;
112
113 int     winlines = 20;
114 int     nflag = 0;
115 int     verbose = 0;
116
117 kvm_t *kd;
118
119 struct kinfo_cputime cp_time, old_cp_time, diff_cp_time;
120
121 #define FORKSTAT        0x01
122 #define INTRSTAT        0x02
123 #define MEMSTAT         0x04
124 #define SUMSTAT         0x08
125 #define TIMESTAT        0x10
126 #define VMSTAT          0x20
127 #define ZMEMSTAT        0x40
128
129 static void cpustats(void);
130 static void dointr(void);
131 static void domem(void);
132 static void dosum(void);
133 static void dozmem(void);
134 static void dovmstat(u_int, int);
135 static void kread(int, void *, size_t);
136 static void usage(void);
137 static char **getdrivedata(char **);
138 static long getuptime(void);
139 static void needhdr(int);
140 static long pct(long, long);
141
142 #ifdef notyet
143 static void dotimes(void); /* Not implemented */
144 static void doforkst(void);
145 #endif
146 static void printhdr(void);
147 static void devstats(void);
148
149 int
150 main(int argc, char **argv)
151 {
152         int c, todo;
153         u_int interval;
154         int reps;
155         char *memf, *nlistf;
156         char errbuf[_POSIX2_LINE_MAX];
157
158         memf = nlistf = NULL;
159         interval = reps = todo = 0;
160         maxshowdevs = 2;
161         while ((c = getopt(argc, argv, "c:fiM:mN:n:p:stvw:z")) != -1) {
162                 switch (c) {
163                 case 'c':
164                         reps = atoi(optarg);
165                         break;
166                 case 'f':
167 #ifdef notyet
168                         todo |= FORKSTAT;
169 #else
170                         errx(EX_USAGE, "sorry, -f is not (re)implemented yet");
171 #endif
172                         break;
173                 case 'i':
174                         todo |= INTRSTAT;
175                         break;
176                 case 'M':
177                         memf = optarg;
178                         break;
179                 case 'm':
180                         todo |= MEMSTAT;
181                         break;
182                 case 'N':
183                         nlistf = optarg;
184                         break;
185                 case 'n':
186                         nflag = 1;
187                         maxshowdevs = atoi(optarg);
188                         if (maxshowdevs < 0)
189                                 errx(1, "number of devices %d is < 0",
190                                      maxshowdevs);
191                         break;
192                 case 'p':
193                         if (buildmatch(optarg, &matches, &num_matches) != 0)
194                                 errx(1, "%s", devstat_errbuf);
195                         break;
196                 case 's':
197                         todo |= SUMSTAT;
198                         break;
199                 case 't':
200 #ifdef notyet
201                         todo |= TIMESTAT;
202 #else
203                         errx(EX_USAGE, "sorry, -t is not (re)implemented yet");
204 #endif
205                         break;
206                 case 'v':
207                         ++verbose;
208                         break;
209                 case 'w':
210                         interval = atoi(optarg);
211                         break;
212                 case 'z':
213                         todo |= ZMEMSTAT;
214                         break;
215                 default:
216                         usage();
217                 }
218         }
219         argc -= optind;
220         argv += optind;
221
222         if (todo == 0)
223                 todo = VMSTAT;
224
225         /*
226          * Discard setgid privileges if not the running kernel so that bad
227          * guys can't print interesting stuff from kernel memory.
228          */
229         if (nlistf != NULL || memf != NULL)
230                 setgid(getgid());
231
232         kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
233         if (kd == 0) 
234                 errx(1, "kvm_openfiles: %s", errbuf);
235
236         if ((c = kvm_nlist(kd, namelist)) != 0) {
237                 if (c > 0) {
238                         warnx("undefined symbols:");
239                         for (c = 0; c < (int)__arysize(namelist); c++)
240                                 if (namelist[c].n_type == 0)
241                                         fprintf(stderr, " %s",
242                                             namelist[c].n_name);
243                         fputc('\n', stderr);
244                 } else
245                         warnx("kvm_nlist: %s", kvm_geterr(kd));
246                 exit(1);
247         }
248
249         if (todo & VMSTAT) {
250                 struct winsize winsize;
251
252                 /*
253                  * Make sure that the userland devstat version matches the
254                  * kernel devstat version.  If not, exit and print a
255                  * message informing the user of his mistake.
256                  */
257                 if (checkversion() < 0)
258                         errx(1, "%s", devstat_errbuf);
259
260
261                 argv = getdrivedata(argv);
262                 winsize.ws_row = 0;
263                 ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&winsize);
264                 if (winsize.ws_row > 0)
265                         winlines = winsize.ws_row;
266
267         }
268
269 #define BACKWARD_COMPATIBILITY
270 #ifdef  BACKWARD_COMPATIBILITY
271         if (*argv) {
272                 interval = atoi(*argv);
273                 if (*++argv)
274                         reps = atoi(*argv);
275         }
276 #endif
277
278         if (interval) {
279                 if (!reps)
280                         reps = -1;
281         } else if (reps)
282                 interval = 1;
283
284 #ifdef notyet
285         if (todo & FORKSTAT)
286                 doforkst();
287 #endif
288         if (todo & MEMSTAT)
289                 domem();
290         if (todo & ZMEMSTAT)
291                 dozmem();
292         if (todo & SUMSTAT)
293                 dosum();
294 #ifdef notyet
295         if (todo & TIMESTAT)
296                 dotimes();
297 #endif
298         if (todo & INTRSTAT)
299                 dointr();
300         if (todo & VMSTAT)
301                 dovmstat(interval, reps);
302         exit(0);
303 }
304
305 static char **
306 getdrivedata(char **argv)
307 {
308         if ((num_devices = getnumdevs()) < 0)
309                 errx(1, "%s", devstat_errbuf);
310
311         cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
312         last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
313         bzero(cur.dinfo, sizeof(struct devinfo));
314         bzero(last.dinfo, sizeof(struct devinfo));
315
316         if (getdevs(&cur) == -1)
317                 errx(1, "%s", devstat_errbuf);
318
319         num_devices = cur.dinfo->numdevs;
320         generation = cur.dinfo->generation;
321
322         specified_devices = (char **)malloc(sizeof(char *));
323         for (num_devices_specified = 0; *argv; ++argv) {
324                 if (isdigit(**argv))
325                         break;
326                 num_devices_specified++;
327                 specified_devices = (char **)realloc(specified_devices,
328                                                      sizeof(char *) *
329                                                      num_devices_specified);
330                 specified_devices[num_devices_specified - 1] = *argv;
331         }
332         dev_select = NULL;
333
334         if (nflag == 0 && maxshowdevs < num_devices_specified)
335                         maxshowdevs = num_devices_specified;
336
337         /*
338          * People are generally only interested in disk statistics when
339          * they're running vmstat.  So, that's what we're going to give
340          * them if they don't specify anything by default.  We'll also give
341          * them any other random devices in the system so that we get to
342          * maxshowdevs devices, if that many devices exist.  If the user
343          * specifies devices on the command line, either through a pattern
344          * match or by naming them explicitly, we will give the user only
345          * those devices.
346          */
347         if ((num_devices_specified == 0) && (num_matches == 0)) {
348                 if (buildmatch("da", &matches, &num_matches) != 0)
349                         errx(1, "%s", devstat_errbuf);
350
351                 select_mode = DS_SELECT_ADD;
352         } else
353                 select_mode = DS_SELECT_ONLY;
354
355         /*
356          * At this point, selectdevs will almost surely indicate that the
357          * device list has changed, so we don't look for return values of 0
358          * or 1.  If we get back -1, though, there is an error.
359          */
360         if (selectdevs(&dev_select, &num_selected, &num_selections,
361                        &select_generation, generation, cur.dinfo->devices,
362                        num_devices, matches, num_matches, specified_devices,
363                        num_devices_specified, select_mode,
364                        maxshowdevs, 0) == -1)
365                 errx(1, "%s", devstat_errbuf);
366
367         return(argv);
368 }
369
370 static long
371 getuptime(void)
372 {
373         static time_t now, boottime;
374         time_t uptime;
375
376         if (boottime == 0)
377                 kread(X_BOOTTIME, &boottime, sizeof(boottime));
378         time(&now);
379         uptime = now - boottime;
380         if (uptime <= 0 || uptime > 60*60*24*365*10)
381                 errx(1, "time makes no sense; namelist must be wrong");
382         return(uptime);
383 }
384
385 int     hdrcnt;
386
387 static void
388 dovmstat(u_int interval, int reps)
389 {
390         struct vmtotal total;
391         time_t uptime, halfuptime;
392         struct devinfo *tmp_dinfo;
393         size_t vmm_size = sizeof(vmm);
394         size_t vms_size = sizeof(vms);
395         size_t vmt_size = sizeof(total);
396
397         uptime = getuptime();
398         halfuptime = uptime / 2;
399         signal(SIGCONT, needhdr);
400
401         for (hdrcnt = 1;;) {
402                 if (!--hdrcnt)
403                         printhdr();
404                 if (kinfo_get_sched_cputime(&cp_time))
405                         err(1, "kinfo_get_sched_cputime");
406
407                 tmp_dinfo = last.dinfo;
408                 last.dinfo = cur.dinfo;
409                 cur.dinfo = tmp_dinfo;
410                 last.busy_time = cur.busy_time;
411
412                 /*
413                  * Here what we want to do is refresh our device stats.
414                  * getdevs() returns 1 when the device list has changed.
415                  * If the device list has changed, we want to go through
416                  * the selection process again, in case a device that we
417                  * were previously displaying has gone away.
418                  */
419                 switch (getdevs(&cur)) {
420                 case -1:
421                         errx(1, "%s", devstat_errbuf);
422                         break;
423                 case 1: {
424                         int retval;
425
426                         num_devices = cur.dinfo->numdevs;
427                         generation = cur.dinfo->generation;
428
429                         retval = selectdevs(&dev_select, &num_selected,
430                                             &num_selections, &select_generation,
431                                             generation, cur.dinfo->devices,
432                                             num_devices, matches, num_matches,
433                                             specified_devices,
434                                             num_devices_specified, select_mode,
435                                             maxshowdevs, 0);
436                         switch (retval) {
437                         case -1:
438                                 errx(1, "%s", devstat_errbuf);
439                                 break;
440                         case 1:
441                                 printhdr();
442                                 break;
443                         default:
444                                 break;
445                         }
446                 }
447                 default:
448                         break;
449                 }
450
451                 if (sysctlbyname("vm.vmstats", &vms, &vms_size, NULL, 0)) {
452                         perror("sysctlbyname: vm.vmstats");
453                         exit(1);
454                 }
455                 if (sysctlbyname("vm.vmmeter", &vmm, &vmm_size, NULL, 0)) {
456                         perror("sysctlbyname: vm.vmmeter");
457                         exit(1);
458                 } 
459                 if (sysctlbyname("vm.vmtotal", &total, &vmt_size, NULL, 0)) {
460                         perror("sysctlbyname: vm.vmtotal");
461                         exit(1);
462                 } 
463                 printf("%2d %1d %1d",
464                     total.t_rq - 1, total.t_dw + total.t_pw, total.t_sw);
465 #define vmstat_pgtok(a) ((a) * vms.v_page_size >> 10)
466 #define rate(x) (((x) + halfuptime) / uptime)   /* round */
467                 printf(" %7ld %6ld ",
468                     (long)vmstat_pgtok(total.t_avm), (long)vmstat_pgtok(total.t_free));
469                 printf("%4lu ",
470                     (u_long)rate(vmm.v_vm_faults - ovmm.v_vm_faults));
471                 printf("%3lu ",
472                     (u_long)rate(vmm.v_reactivated - ovmm.v_reactivated));
473                 printf("%3lu ",
474                     (u_long)rate(vmm.v_swapin + vmm.v_vnodein -
475                     (ovmm.v_swapin + ovmm.v_vnodein)));
476                 printf("%3lu ",
477                     (u_long)rate(vmm.v_swapout + vmm.v_vnodeout -
478                     (ovmm.v_swapout + ovmm.v_vnodeout)));
479                 printf("%3lu ",
480                     (u_long)rate(vmm.v_tfree - ovmm.v_tfree));
481                 printf("%3lu ",
482                     (u_long)rate(vmm.v_pdpages - ovmm.v_pdpages));
483                 devstats();
484                 printf("%4lu %4lu %3lu ",
485                     (u_long)rate(vmm.v_intr - ovmm.v_intr),
486                     (u_long)rate(vmm.v_syscall - ovmm.v_syscall),
487                     (u_long)rate(vmm.v_swtch - ovmm.v_swtch));
488                 cpustats();
489                 printf("\n");
490                 fflush(stdout);
491                 if (reps >= 0 && --reps <= 0)
492                         break;
493                 ovmm = vmm;
494                 uptime = interval;
495                 /*
496                  * We round upward to avoid losing low-frequency events
497                  * (i.e., >= 1 per interval but < 1 per second).
498                  */
499                 if (interval != 1)
500                         halfuptime = (uptime + 1) / 2;
501                 else
502                         halfuptime = 0;
503                 sleep(interval);
504         }
505 }
506
507 static void
508 printhdr(void)
509 {
510         int i, num_shown;
511
512         num_shown = (num_selected < maxshowdevs) ? num_selected : maxshowdevs;
513         printf(" procs      memory      page%*s", 19, "");
514         if (num_shown > 1)
515                 printf(" disks %*s", num_shown * 4 - 7, "");
516         else if (num_shown == 1)
517                 printf("disk");
518         printf("   faults      cpu\n");
519         printf(" r b w     avm    fre  flt  re  pi  po  fr  sr ");
520         for (i = 0; i < num_devices; i++)
521                 if ((dev_select[i].selected)
522                  && (dev_select[i].selected <= maxshowdevs))
523                         printf("%c%c%d ", dev_select[i].device_name[0],
524                                      dev_select[i].device_name[1],
525                                      dev_select[i].unit_number);
526         printf("  in   sy  cs us sy id\n");
527         hdrcnt = winlines - 2;
528 }
529
530 /*
531  * Force a header to be prepended to the next output.
532  */
533 static void
534 needhdr(__unused int signo)
535 {
536
537         hdrcnt = 1;
538 }
539
540 static long
541 pct(long top, long bot)
542 {
543         long ans;
544
545         if (bot == 0)
546                 return(0);
547         ans = (quad_t)top * 100 / bot;
548         return (ans);
549 }
550
551 #define PCT(top, bot) pct((long)(top), (long)(bot))
552
553 static void
554 dosum(void)
555 {
556         struct nchstats *nch_tmp, nchstats;
557         size_t vms_size = sizeof(vms);
558         size_t vmm_size = sizeof(vmm);
559         int cpucnt;
560         u_long nchtotal;
561         size_t nch_size = sizeof(struct nchstats) * SMP_MAXCPU;
562
563         if (sysctlbyname("vm.vmstats", &vms, &vms_size, NULL, 0)) {
564                 perror("sysctlbyname: vm.vmstats");
565                 exit(1);
566         }
567         if (sysctlbyname("vm.vmmeter", &vmm, &vmm_size, NULL, 0)) {
568                 perror("sysctlbyname: vm.vmstats");
569                 exit(1);
570         }
571         printf("%9u cpu context switches\n", vmm.v_swtch);
572         printf("%9u device interrupts\n", vmm.v_intr);
573         printf("%9u software interrupts\n", vmm.v_soft);
574         printf("%9u traps\n", vmm.v_trap);
575         printf("%9u system calls\n", vmm.v_syscall);
576         printf("%9u kernel threads created\n", vmm.v_kthreads);
577         printf("%9u  fork() calls\n", vmm.v_forks);
578         printf("%9u vfork() calls\n", vmm.v_vforks);
579         printf("%9u rfork() calls\n", vmm.v_rforks);
580         printf("%9u exec() calls\n", vmm.v_exec);
581         printf("%9u swap pager pageins\n", vmm.v_swapin);
582         printf("%9u swap pager pages paged in\n", vmm.v_swappgsin);
583         printf("%9u swap pager pageouts\n", vmm.v_swapout);
584         printf("%9u swap pager pages paged out\n", vmm.v_swappgsout);
585         printf("%9u vnode pager pageins\n", vmm.v_vnodein);
586         printf("%9u vnode pager pages paged in\n", vmm.v_vnodepgsin);
587         printf("%9u vnode pager pageouts\n", vmm.v_vnodeout);
588         printf("%9u vnode pager pages paged out\n", vmm.v_vnodepgsout);
589         printf("%9u page daemon wakeups\n", vmm.v_pdwakeups);
590         printf("%9u pages examined by the page daemon\n", vmm.v_pdpages);
591         printf("%9u pages reactivated\n", vmm.v_reactivated);
592         printf("%9u copy-on-write faults\n", vmm.v_cow_faults);
593         printf("%9u copy-on-write optimized faults\n", vmm.v_cow_optim);
594         printf("%9u zero fill pages zeroed\n", vmm.v_zfod);
595         printf("%9u zero fill pages prezeroed\n", vmm.v_ozfod);
596         printf("%9u intransit blocking page faults\n", vmm.v_intrans);
597         printf("%9u total VM faults taken\n", vmm.v_vm_faults);
598         printf("%9u pages affected by kernel thread creation\n", vmm.v_kthreadpages);
599         printf("%9u pages affected by  fork()\n", vmm.v_forkpages);
600         printf("%9u pages affected by vfork()\n", vmm.v_vforkpages);
601         printf("%9u pages affected by rfork()\n", vmm.v_rforkpages);
602         printf("%9u pages freed\n", vmm.v_tfree);
603         printf("%9u pages freed by daemon\n", vmm.v_dfree);
604         printf("%9u pages freed by exiting processes\n", vmm.v_pfree);
605         printf("%9u pages active\n", vms.v_active_count);
606         printf("%9u pages inactive\n", vms.v_inactive_count);
607         printf("%9u pages in VM cache\n", vms.v_cache_count);
608         printf("%9u pages wired down\n", vms.v_wire_count);
609         printf("%9u pages free\n", vms.v_free_count);
610         printf("%9u bytes per page\n", vms.v_page_size);
611         
612         if ((nch_tmp = malloc(nch_size)) == NULL) {
613                 perror("malloc");
614                 exit(1);
615         } else {
616                 if (sysctlbyname("vfs.cache.nchstats", nch_tmp, &nch_size, NULL, 0)) {
617                         perror("sysctlbyname vfs.cache.nchstats");
618                         free(nch_tmp);
619                         exit(1);
620                 } else {
621                         if ((nch_tmp = realloc(nch_tmp, nch_size)) == NULL) {
622                                 perror("realloc");
623                                 exit(1);
624                         }
625                 }
626         }
627         
628         cpucnt = nch_size / sizeof(struct nchstats);
629         kvm_nch_cpuagg(nch_tmp, &nchstats, cpucnt);
630
631         nchtotal = nchstats.ncs_goodhits + nchstats.ncs_neghits +
632             nchstats.ncs_badhits + nchstats.ncs_falsehits +
633             nchstats.ncs_miss + nchstats.ncs_long;
634         printf("%9ld total name lookups\n", nchtotal);
635         printf(
636             "%9s cache hits (%ld%% pos + %ld%% neg) system %ld%% per-directory\n",
637             "", PCT(nchstats.ncs_goodhits, nchtotal),
638             PCT(nchstats.ncs_neghits, nchtotal),
639             PCT(nchstats.ncs_pass2, nchtotal));
640         printf("%9s deletions %ld%%, falsehits %ld%%, toolong %ld%%\n", "",
641             PCT(nchstats.ncs_badhits, nchtotal),
642             PCT(nchstats.ncs_falsehits, nchtotal),
643             PCT(nchstats.ncs_long, nchtotal));
644         free(nch_tmp);
645 }
646
647 #ifdef notyet
648 void
649 doforkst(void)
650 {
651         struct forkstat fks;
652
653         kread(X_FORKSTAT, &fks, sizeof(struct forkstat));
654         printf("%d forks, %d pages, average %.2f\n",
655             fks.cntfork, fks.sizfork, (double)fks.sizfork / fks.cntfork);
656         printf("%d vforks, %d pages, average %.2f\n",
657             fks.cntvfork, fks.sizvfork, (double)fks.sizvfork / fks.cntvfork);
658 }
659 #endif
660
661 static void
662 devstats(void)
663 {
664         int dn;
665         long double transfers_per_second;
666         long double busy_seconds;
667
668         diff_cp_time.cp_user = cp_time.cp_user - old_cp_time.cp_user;
669         diff_cp_time.cp_nice = cp_time.cp_nice - old_cp_time.cp_nice;
670         diff_cp_time.cp_sys = cp_time.cp_sys - old_cp_time.cp_sys;
671         diff_cp_time.cp_intr = cp_time.cp_intr - old_cp_time.cp_intr;
672         diff_cp_time.cp_idle = cp_time.cp_idle - old_cp_time.cp_idle;
673         old_cp_time = cp_time;
674
675         busy_seconds = compute_etime(cur.busy_time, last.busy_time);
676
677         for (dn = 0; dn < num_devices; dn++) {
678                 int di;
679
680                 if ((dev_select[dn].selected == 0)
681                  || (dev_select[dn].selected > maxshowdevs))
682                         continue;
683
684                 di = dev_select[dn].position;
685
686                 if (compute_stats(&cur.dinfo->devices[di],
687                                   &last.dinfo->devices[di], busy_seconds,
688                                   NULL, NULL, NULL,
689                                   NULL, &transfers_per_second, NULL,
690                                   NULL, NULL) != 0)
691                         errx(1, "%s", devstat_errbuf);
692
693                 printf("%3.0Lf ", transfers_per_second);
694         }
695 }
696
697 static void
698 cpustats(void)
699 {
700         uint64_t total;
701         double totusage;
702
703         total = diff_cp_time.cp_user + diff_cp_time.cp_nice +
704             diff_cp_time.cp_sys + diff_cp_time.cp_intr + diff_cp_time.cp_idle;
705
706         if (total)
707                 totusage = 100.0 / total;
708         else
709                 totusage = 0;
710         printf("%2.0f ",
711                (diff_cp_time.cp_user + diff_cp_time.cp_nice) * totusage);
712         printf("%2.0f ",
713                (diff_cp_time.cp_sys + diff_cp_time.cp_intr) * totusage);
714         printf("%2.0f",
715                diff_cp_time.cp_idle * totusage);
716 }
717
718 static void
719 dointr(void)
720 {
721         u_long *intrcnt, uptime;
722         u_int64_t inttotal;
723         size_t nintr, inamlen, i, size;
724         int nwidth;
725         char *intrstr;
726         char **intrname;
727
728         uptime = getuptime();
729         if (sysctlbyname("hw.intrnames", NULL, &inamlen, NULL, 0) != 0)
730                 errx(1, "sysctlbyname");
731         intrstr = malloc(inamlen);
732         if (intrstr == NULL)
733                 err(1, "malloc");
734         sysctlbyname("hw.intrnames", intrstr, &inamlen, NULL, 0);
735         for (nintr = 0, i = 0; i < inamlen; ++i) {
736                 if (intrstr[i] == 0)
737                         nintr++;
738         }
739         intrname = malloc(nintr * sizeof(char *));
740         for (i = 0; i < nintr; ++i) {
741                 intrname[i] = intrstr;
742                 intrstr += strlen(intrstr) + 1;
743         }
744
745         size = nintr * sizeof(*intrcnt);
746         intrcnt = calloc(nintr, sizeof(*intrcnt));
747         if (intrcnt == NULL)
748                 err(1, "malloc");
749         sysctlbyname("hw.intrcnt", intrcnt, &size, NULL, 0);
750
751         nwidth = 21;
752         for (i = 0; i < nintr; ++i) {
753                 if (nwidth < (int)strlen(intrname[i]))
754                         nwidth = (int)strlen(intrname[i]);
755         }
756         if (verbose) nwidth += 8;
757
758         printf("%-*.*s %11s %10s\n",
759                 nwidth, nwidth, "interrupt", "total", "rate");
760         inttotal = 0;
761         for (i = 0; i < nintr; ++i) {
762                 int named;
763                 char *infop, irqinfo[72];
764
765                 if ((named = strncmp(intrname[i], "irq", 3)) != 0 ||
766                     intrcnt[i] > 0) {
767                         infop = intrname[i];
768                         if (verbose && named) {
769                                 snprintf(irqinfo, sizeof(irqinfo),
770                                          "irq%zd: %s", i, intrname[i]);
771                                 infop = irqinfo;
772                         }
773                         printf("%-*.*s %11lu %10lu\n", 
774                                 nwidth, nwidth, infop,
775                                 intrcnt[i], intrcnt[i] / uptime);
776                 }
777                 inttotal += intrcnt[i];
778         }
779         printf("%-*.*s %11llu %10llu\n", 
780                 nwidth, nwidth, "Total",
781                 (long long)inttotal, (long long)(inttotal / uptime));
782 }
783
784 #define MAX_KMSTATS     200
785
786 static long
787 cpuagg(long *ary)
788 {
789     int i;
790     long ttl;
791
792     for (i = ttl = 0; i < SMP_MAXCPU; ++i)
793         ttl += ary[i];
794     return(ttl);
795 }
796
797 static void
798 domem(void)
799 {
800         struct malloc_type *ks;
801         int i, j;
802         int first, nkms;
803         long totuse = 0, totfree = 0, totreq = 0;
804         struct malloc_type kmemstats[MAX_KMSTATS], *kmsp;
805         char buf[1024];
806
807         kread(X_KMEMSTATISTICS, &kmsp, sizeof(kmsp));
808         for (nkms = 0; nkms < MAX_KMSTATS && kmsp != NULL; nkms++) {
809                 if (sizeof(kmemstats[0]) != kvm_read(kd, (u_long)kmsp,
810                     &kmemstats[nkms], sizeof(kmemstats[0])))
811                         err(1, "kvm_read(%p)", (void *)kmsp);
812                 if (sizeof(buf) !=  kvm_read(kd, 
813                     (u_long)kmemstats[nkms].ks_shortdesc, buf, sizeof(buf)))
814                         err(1, "kvm_read(%p)", 
815                             kmemstats[nkms].ks_shortdesc);
816                 buf[sizeof(buf) - 1] = '\0';
817                 kmemstats[nkms].ks_shortdesc = strdup(buf);
818                 kmsp = kmemstats[nkms].ks_next;
819         }
820         if (kmsp != NULL)
821                 warnx("truncated to the first %d memory types", nkms);
822
823         printf(
824             "\nMemory statistics by type                          Type  Kern\n");
825         printf(
826 "              Type  InUse MemUse HighUse  Limit Requests  Limit Limit Size(s)\n");
827         for (i = 0, ks = &kmemstats[0]; i < nkms; i++, ks++) {
828                 if (ks->ks_calls == 0)
829                         continue;
830                 printf("%19s%6ld%6ldK%7ldK%7ldK%9jd%5u%6u",
831                     ks->ks_shortdesc,
832                     cpuagg(ks->ks_inuse), (cpuagg(ks->ks_memuse) + 1023) / 1024,
833                     (ks->ks_maxused + 1023) / 1024,
834                     (ks->ks_limit + 1023) / 1024, (intmax_t)ks->ks_calls,
835                     ks->ks_limblocks, ks->ks_mapblocks);
836                 first = 1;
837                 for (j =  1 << MINBUCKET; j < 1 << (MINBUCKET + 16); j <<= 1) {
838                         if ((ks->ks_size & j) == 0)
839                                 continue;
840                         if (first)
841                                 printf("  ");
842                         else
843                                 printf(",");
844                         if(j<1024)
845                                 printf("%d",j);
846                         else
847                                 printf("%dK",j>>10);
848                         first = 0;
849                 }
850                 printf("\n");
851                 totuse += cpuagg(ks->ks_memuse);
852                 totreq += ks->ks_calls;
853         }
854         printf("\nMemory Totals:  In Use    Free    Requests\n");
855         printf("              %7ldK %6ldK    %8ld\n",
856              (totuse + 1023) / 1024, (totfree + 1023) / 1024, totreq);
857 }
858
859 static void
860 dozmem(void)
861 {
862         char *buf;
863         size_t bufsize;
864
865         buf = NULL;
866         bufsize = 1024;
867         for (;;) {
868                 if ((buf = realloc(buf, bufsize)) == NULL)
869                         err(1, "realloc()");
870                 if (sysctlbyname("vm.zone", buf, &bufsize, NULL, 0) == 0)
871                         break;
872                 if (errno != ENOMEM)
873                         err(1, "sysctl()");
874                 bufsize *= 2;
875         }
876         buf[bufsize] = '\0'; /* play it safe */
877         printf("%s\n\n", buf);
878         free(buf);
879 }
880
881 /*
882  * kread reads something from the kernel, given its nlist index.
883  */
884 static void
885 kread(int nlx, void *addr, size_t size)
886 {
887         const char *sym;
888
889         if (namelist[nlx].n_type == 0 || namelist[nlx].n_value == 0) {
890                 sym = namelist[nlx].n_name;
891                 if (*sym == '_')
892                         ++sym;
893                 errx(1, "symbol %s not defined", sym);
894         }
895         if (kvm_read(kd, namelist[nlx].n_value, addr, size) != (ssize_t)size) {
896                 sym = namelist[nlx].n_name;
897                 if (*sym == '_')
898                         ++sym;
899                 errx(1, "%s: %s", sym, kvm_geterr(kd));
900         }
901 }
902
903 static void
904 usage(void)
905 {
906         fprintf(stderr, "%s%s",
907                 "usage: vmstat [-imsvz] [-c count] [-M core] [-N system] [-w wait]\n",
908                 "              [-n devs] [disks]\n");
909         exit(1);
910 }