2 * Copyright (c) 1980, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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 $
39 #define _KERNEL_STRUCTURES
41 #include <sys/param.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>
53 #include <vm/vm_param.h>
71 static struct nlist namelist[] = {
73 { "_boottime", 0, 0, 0, 0 },
75 { "_nchstats", 0, 0, 0, 0 },
76 #define X_KMEMSTATISTICS 2
77 { "_kmemstatistics", 0, 0, 0, 0 },
79 { "_zlist", 0, 0, 0, 0 },
82 { "_deficit", 0, 0, 0, 0 },
84 { "_forkstat", 0, 0, 0, 0 },
86 { "_rectime", 0, 0, 0, 0 },
88 { "_pgintime", 0, 0, 0, 0 },
90 { "_xstats", 0, 0, 0, 0 },
98 struct statinfo cur, last;
99 int num_devices, maxshowdevs;
101 struct device_selection *dev_select;
103 struct devstat_match *matches;
105 int num_devices_specified, num_selections;
106 long select_generation;
107 char **specified_devices;
108 devstat_select_mode select_mode;
110 struct vmmeter vmm, ovmm;
111 struct vmstats vms, ovms;
119 struct kinfo_cputime cp_time, old_cp_time, diff_cp_time;
121 #define FORKSTAT 0x01
122 #define INTRSTAT 0x02
125 #define TIMESTAT 0x10
127 #define ZMEMSTAT 0x40
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);
143 static void dotimes(void); /* Not implemented */
144 static void doforkst(void);
146 static void printhdr(void);
147 static void devstats(void);
150 main(int argc, char **argv)
156 char errbuf[_POSIX2_LINE_MAX];
158 memf = nlistf = NULL;
159 interval = reps = todo = 0;
161 while ((c = getopt(argc, argv, "c:fiM:mN:n:p:stvw:z")) != -1) {
170 errx(EX_USAGE, "sorry, -f is not (re)implemented yet");
187 maxshowdevs = atoi(optarg);
189 errx(1, "number of devices %d is < 0",
193 if (buildmatch(optarg, &matches, &num_matches) != 0)
194 errx(1, "%s", devstat_errbuf);
203 errx(EX_USAGE, "sorry, -t is not (re)implemented yet");
210 interval = atoi(optarg);
226 * Discard setgid privileges if not the running kernel so that bad
227 * guys can't print interesting stuff from kernel memory.
229 if (nlistf != NULL || memf != NULL)
232 kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
234 errx(1, "kvm_openfiles: %s", errbuf);
236 if ((c = kvm_nlist(kd, namelist)) != 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",
245 warnx("kvm_nlist: %s", kvm_geterr(kd));
250 struct winsize winsize;
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.
257 if (checkversion() < 0)
258 errx(1, "%s", devstat_errbuf);
261 argv = getdrivedata(argv);
263 ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&winsize);
264 if (winsize.ws_row > 0)
265 winlines = winsize.ws_row;
269 #define BACKWARD_COMPATIBILITY
270 #ifdef BACKWARD_COMPATIBILITY
272 interval = atoi(*argv);
301 dovmstat(interval, reps);
306 getdrivedata(char **argv)
308 if ((num_devices = getnumdevs()) < 0)
309 errx(1, "%s", devstat_errbuf);
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));
316 if (getdevs(&cur) == -1)
317 errx(1, "%s", devstat_errbuf);
319 num_devices = cur.dinfo->numdevs;
320 generation = cur.dinfo->generation;
322 specified_devices = (char **)malloc(sizeof(char *));
323 for (num_devices_specified = 0; *argv; ++argv) {
326 num_devices_specified++;
327 specified_devices = (char **)realloc(specified_devices,
329 num_devices_specified);
330 specified_devices[num_devices_specified - 1] = *argv;
334 if (nflag == 0 && maxshowdevs < num_devices_specified)
335 maxshowdevs = num_devices_specified;
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
347 if ((num_devices_specified == 0) && (num_matches == 0)) {
348 if (buildmatch("da", &matches, &num_matches) != 0)
349 errx(1, "%s", devstat_errbuf);
351 select_mode = DS_SELECT_ADD;
353 select_mode = DS_SELECT_ONLY;
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.
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);
373 static time_t now, boottime;
377 kread(X_BOOTTIME, &boottime, sizeof(boottime));
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");
388 dovmstat(u_int interval, int reps)
390 struct vmtotal total;
391 time_t uptime, halfuptime;
392 struct devinfo *tmp_dinfo;
393 int vmm_size = sizeof(vmm);
394 int vms_size = sizeof(vms);
395 int vmt_size = sizeof(total);
397 uptime = getuptime();
398 halfuptime = uptime / 2;
399 signal(SIGCONT, needhdr);
404 if (kinfo_get_sched_cputime(&cp_time))
405 err(1, "kinfo_get_sched_cputime");
407 tmp_dinfo = last.dinfo;
408 last.dinfo = cur.dinfo;
409 cur.dinfo = tmp_dinfo;
410 last.busy_time = cur.busy_time;
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.
419 switch (getdevs(&cur)) {
421 errx(1, "%s", devstat_errbuf);
426 num_devices = cur.dinfo->numdevs;
427 generation = cur.dinfo->generation;
429 retval = selectdevs(&dev_select, &num_selected,
430 &num_selections, &select_generation,
431 generation, cur.dinfo->devices,
432 num_devices, matches, num_matches,
434 num_devices_specified, select_mode,
438 errx(1, "%s", devstat_errbuf);
451 if (sysctlbyname("vm.vmstats", &vms, &vms_size, NULL, 0)) {
452 perror("sysctlbyname: vm.vmstats");
455 if (sysctlbyname("vm.vmmeter", &vmm, &vmm_size, NULL, 0)) {
456 perror("sysctlbyname: vm.vmmeter");
459 if (sysctlbyname("vm.vmtotal", &total, &vmt_size, NULL, 0)) {
460 perror("sysctlbyname: vm.vmtotal");
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));
470 (u_long)rate(vmm.v_vm_faults - ovmm.v_vm_faults));
472 (u_long)rate(vmm.v_reactivated - ovmm.v_reactivated));
474 (u_long)rate(vmm.v_swapin + vmm.v_vnodein -
475 (ovmm.v_swapin + ovmm.v_vnodein)));
477 (u_long)rate(vmm.v_swapout + vmm.v_vnodeout -
478 (ovmm.v_swapout + ovmm.v_vnodeout)));
480 (u_long)rate(vmm.v_tfree - ovmm.v_tfree));
482 (u_long)rate(vmm.v_pdpages - ovmm.v_pdpages));
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));
491 if (reps >= 0 && --reps <= 0)
496 * We round upward to avoid losing low-frequency events
497 * (i.e., >= 1 per interval but < 1 per second).
500 halfuptime = (uptime + 1) / 2;
512 num_shown = (num_selected < maxshowdevs) ? num_selected : maxshowdevs;
513 printf(" procs memory page%*s", 19, "");
515 printf(" disks %*s", num_shown * 4 - 7, "");
516 else if (num_shown == 1)
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;
531 * Force a header to be prepended to the next output.
534 needhdr(__unused int signo)
541 pct(long top, long bot)
547 ans = (quad_t)top * 100 / bot;
551 #define PCT(top, bot) pct((long)(top), (long)(bot))
556 struct nchstats *nch_tmp, nchstats;
557 int vms_size = sizeof(vms);
558 int vmm_size = sizeof(vmm);
561 size_t nch_size = sizeof(struct nchstats) * SMP_MAXCPU;
563 if (sysctlbyname("vm.vmstats", &vms, &vms_size, NULL, 0)) {
564 perror("sysctlbyname: vm.vmstats");
567 if (sysctlbyname("vm.vmmeter", &vmm, &vmm_size, NULL, 0)) {
568 perror("sysctlbyname: vm.vmstats");
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);
612 if ((nch_tmp = malloc(nch_size)) == NULL) {
616 if (sysctlbyname("vfs.cache.nchstats", nch_tmp, &nch_size, NULL, 0)) {
617 perror("sysctlbyname vfs.cache.nchstats");
621 if ((nch_tmp = realloc(nch_tmp, nch_size)) == NULL) {
628 cpucnt = nch_size / sizeof(struct nchstats);
629 kvm_nch_cpuagg(nch_tmp, &nchstats, cpucnt);
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);
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));
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);
665 long double transfers_per_second;
666 long double busy_seconds;
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;
675 busy_seconds = compute_etime(cur.busy_time, last.busy_time);
677 for (dn = 0; dn < num_devices; dn++) {
680 if ((dev_select[dn].selected == 0)
681 || (dev_select[dn].selected > maxshowdevs))
684 di = dev_select[dn].position;
686 if (compute_stats(&cur.dinfo->devices[di],
687 &last.dinfo->devices[di], busy_seconds,
689 NULL, &transfers_per_second, NULL,
691 errx(1, "%s", devstat_errbuf);
693 printf("%3.0Lf ", transfers_per_second);
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;
707 totusage = 100.0 / total;
711 (diff_cp_time.cp_user + diff_cp_time.cp_nice) * totusage);
713 (diff_cp_time.cp_sys + diff_cp_time.cp_intr) * totusage);
715 diff_cp_time.cp_idle * totusage);
721 u_long *intrcnt, uptime;
723 size_t nintr, inamlen, i, size;
728 uptime = getuptime();
729 if (sysctlbyname("hw.intrnames", NULL, &inamlen, NULL, 0) != 0)
730 errx(1, "sysctlbyname");
731 intrstr = malloc(inamlen);
734 sysctlbyname("hw.intrnames", intrstr, &inamlen, NULL, 0);
735 for (nintr = 0, i = 0; i < inamlen; ++i) {
739 intrname = malloc(nintr * sizeof(char *));
740 for (i = 0; i < nintr; ++i) {
741 intrname[i] = intrstr;
742 intrstr += strlen(intrstr) + 1;
745 size = nintr * sizeof(*intrcnt);
746 intrcnt = calloc(nintr, sizeof(*intrcnt));
749 sysctlbyname("hw.intrcnt", intrcnt, &size, NULL, 0);
752 for (i = 0; i < nintr; ++i) {
753 if (nwidth < (int)strlen(intrname[i]))
754 nwidth = (int)strlen(intrname[i]);
756 if (verbose) nwidth += 8;
758 printf("%-*.*s %11s %10s\n",
759 nwidth, nwidth, "interrupt", "total", "rate");
761 for (i = 0; i < nintr; ++i) {
763 char *infop, irqinfo[72];
765 if ((named = strncmp(intrname[i], "irq", 3)) != 0 ||
768 if (verbose && named) {
769 snprintf(irqinfo, sizeof(irqinfo),
770 "irq%d: %s", i, intrname[i]);
773 printf("%-*.*s %11lu %10lu\n",
774 nwidth, nwidth, infop,
775 intrcnt[i], intrcnt[i] / uptime);
777 inttotal += intrcnt[i];
779 printf("%-*.*s %11llu %10llu\n",
780 nwidth, nwidth, "Total",
781 inttotal, inttotal / (u_int64_t) uptime);
784 #define MAX_KMSTATS 200
792 for (i = ttl = 0; i < SMP_MAXCPU; ++i)
800 struct malloc_type *ks;
803 long totuse = 0, totfree = 0, totreq = 0;
804 struct malloc_type kmemstats[MAX_KMSTATS], *kmsp;
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;
821 warnx("truncated to the first %d memory types", nkms);
824 "\nMemory statistics by type Type Kern\n");
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)
830 printf("%13s%6ld%6ldK%7ldK%7ldK%9lld%5u%6u",
832 cpuagg(ks->ks_inuse), (cpuagg(ks->ks_memuse) + 1023) / 1024,
833 (ks->ks_maxused + 1023) / 1024,
834 (ks->ks_limit + 1023) / 1024, ks->ks_calls,
835 ks->ks_limblocks, ks->ks_mapblocks);
837 for (j = 1 << MINBUCKET; j < 1 << (MINBUCKET + 16); j <<= 1) {
838 if ((ks->ks_size & j) == 0)
851 totuse += cpuagg(ks->ks_memuse);
852 totreq += ks->ks_calls;
854 printf("\nMemory Totals: In Use Free Requests\n");
855 printf(" %7ldK %6ldK %8ld\n",
856 (totuse + 1023) / 1024, (totfree + 1023) / 1024, totreq);
868 if ((buf = realloc(buf, bufsize)) == NULL)
870 if (sysctlbyname("vm.zone", buf, &bufsize, NULL, 0) == 0)
876 buf[bufsize] = '\0'; /* play it safe */
877 printf("%s\n\n", buf);
882 * kread reads something from the kernel, given its nlist index.
885 kread(int nlx, void *addr, size_t size)
889 if (namelist[nlx].n_type == 0 || namelist[nlx].n_value == 0) {
890 sym = namelist[nlx].n_name;
893 errx(1, "symbol %s not defined", sym);
895 if (kvm_read(kd, namelist[nlx].n_value, addr, size) != (ssize_t)size) {
896 sym = namelist[nlx].n_name;
899 errx(1, "%s: %s", sym, kvm_geterr(kd));
906 fprintf(stderr, "%s%s",
907 "usage: vmstat [-imsvz] [-c count] [-M core] [-N system] [-w wait]\n",
908 " [-n devs] [disks]\n");