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 1.2 2003/06/17 04:29:33 dillon Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41 #include <sys/proc.h>
  42 #include <sys/dkstat.h>
  43 #include <sys/uio.h>
  44 #include <sys/namei.h>
  45 #include <sys/malloc.h>
  46 #include <sys/signal.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/ioctl.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/vmmeter.h>
  51
  52 #include <vm/vm_param.h>
  53
  54 #include <ctype.h>
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <kvm.h>
  58 #include <limits.h>
  59 #include <nlist.h>
  60 #include <paths.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <sysexits.h>
  65 #include <time.h>
  66 #include <unistd.h>
  67 #include <devstat.h>
  68
  69 struct nlist namelist[] = {
  70 #define X_CPTIME        0
  71         { "_cp_time" },
  72 #define X_SUM           1
  73         { "_cnt" },
  74 #define X_BOOTTIME      2
  75         { "_boottime" },
  76 #define X_HZ            3
  77         { "_hz" },
  78 #define X_STATHZ        4
  79         { "_stathz" },
  80 #define X_NCHSTATS      5
  81         { "_nchstats" },
  82 #define X_INTRNAMES     6
  83         { "_intrnames" },
  84 #define X_EINTRNAMES    7
  85         { "_eintrnames" },
  86 #define X_INTRCNT       8
  87         { "_intrcnt" },
  88 #define X_EINTRCNT      9
  89         { "_eintrcnt" },
  90 #define X_KMEMSTATISTICS        10
  91         { "_kmemstatistics" },
  92 #define X_KMEMBUCKETS   11
  93         { "_bucket" },
  94 #define X_ZLIST         12
  95         { "_zlist" },
  96 #ifdef notyet
  97 #define X_DEFICIT       13
  98         { "_deficit" },
  99 #define X_FORKSTAT      14
 100         { "_forkstat" },
 101 #define X_REC           15
 102         { "_rectime" },
 103 #define X_PGIN          16
 104         { "_pgintime" },
 105 #define X_XSTATS        17
 106         { "_xstats" },
 107 #define X_END           18
 108 #else
 109 #define X_END           13
 110 #endif
 111         { "" },
 112 };
 113
 114 struct statinfo cur, last;
 115 int num_devices, maxshowdevs;
 116 long generation;
 117 struct device_selection *dev_select;
 118 int num_selected;
 119 struct devstat_match *matches;
 120 int num_matches = 0;
 121 int num_devices_specified, num_selections;
 122 long select_generation;
 123 char **specified_devices;
 124 devstat_select_mode select_mode;
 125
 126 struct  vmmeter sum, osum;
 127
 128 int     winlines = 20;
 129 int     nflag = 0;
 130
 131 kvm_t *kd;
 132
 133 #define FORKSTAT        0x01
 134 #define INTRSTAT        0x02
 135 #define MEMSTAT         0x04
 136 #define SUMSTAT         0x08
 137 #define TIMESTAT        0x10
 138 #define VMSTAT          0x20
 139 #define ZMEMSTAT        0x40
 140
 141 void    cpustats(), dointr(), domem(), dosum(), dozmem();
 142 void    dovmstat(), kread(), usage();
 143 #ifdef notyet
 144 void    dotimes(), doforkst();
 145 #endif
 146 void printhdr __P((void));
 147 static void devstats();
 148
 149 int
 150 main(argc, argv)
 151         register int argc;
 152         register char **argv;
 153 {
 154         register int c, todo;
 155         u_int interval;
 156         int reps;
 157         char *memf, *nlistf;
 158         char errbuf[_POSIX2_LINE_MAX];
 159
 160         memf = nlistf = NULL;
 161         interval = reps = todo = 0;
 162         maxshowdevs = 2;
 163         while ((c = getopt(argc, argv, "c:fiM:mN:n:p:stw:z")) != -1) {
 164                 switch (c) {
 165                 case 'c':
 166                         reps = atoi(optarg);
 167                         break;
 168                 case 'f':
 169 #ifdef notyet
 170                         todo |= FORKSTAT;
 171 #else
 172                         errx(EX_USAGE, "sorry, -f is not (re)implemented yet");
 173 #endif
 174                         break;
 175                 case 'i':
 176                         todo |= INTRSTAT;
 177                         break;
 178                 case 'M':
 179                         memf = optarg;
 180                         break;
 181                 case 'm':
 182                         todo |= MEMSTAT;
 183                         break;
 184                 case 'N':
 185                         nlistf = optarg;
 186                         break;
 187                 case 'n':
 188                         nflag = 1;
 189                         maxshowdevs = atoi(optarg);
 190                         if (maxshowdevs < 0)
 191                                 errx(1, "number of devices %d is < 0",
 192                                      maxshowdevs);
 193                         break;
 194                 case 'p':
 195                         if (buildmatch(optarg, &matches, &num_matches) != 0)
 196                                 errx(1, "%s", devstat_errbuf);
 197                         break;
 198                 case 's':
 199                         todo |= SUMSTAT;
 200                         break;
 201                 case 't':
 202 #ifdef notyet
 203                         todo |= TIMESTAT;
 204 #else
 205                         errx(EX_USAGE, "sorry, -t is not (re)implemented yet");
 206 #endif
 207                         break;
 208                 case 'w':
 209                         interval = atoi(optarg);
 210                         break;
 211                 case 'z':
 212                         todo |= ZMEMSTAT;
 213                         break;
 214                 case '?':
 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;
 240                             c < sizeof(namelist)/sizeof(namelist[0]); c++)
 241                                 if (namelist[c].n_type == 0)
 242                                         fprintf(stderr, " %s",
 243                                             namelist[c].n_name);
 244                         (void)fputc('\n', stderr);
 245                 } else
 246                         warnx("kvm_nlist: %s", kvm_geterr(kd));
 247                 exit(1);
 248         }
 249
 250         if (todo & VMSTAT) {
 251                 char **getdrivedata();
 252                 struct winsize winsize;
 253
 254                 /*
 255                  * Make sure that the userland devstat version matches the
 256                  * kernel devstat version.  If not, exit and print a
 257                  * message informing the user of his mistake.
 258                  */
 259                 if (checkversion() < 0)
 260                         errx(1, "%s", devstat_errbuf);
 261
 262
 263                 argv = getdrivedata(argv);
 264                 winsize.ws_row = 0;
 265                 (void) ioctl(STDOUT_FILENO, TIOCGWINSZ, (char *)&winsize);
 266                 if (winsize.ws_row > 0)
 267                         winlines = winsize.ws_row;
 268
 269         }
 270
 271 #define BACKWARD_COMPATIBILITY
 272 #ifdef  BACKWARD_COMPATIBILITY
 273         if (*argv) {
 274                 interval = atoi(*argv);
 275                 if (*++argv)
 276                         reps = atoi(*argv);
 277         }
 278 #endif
 279
 280         if (interval) {
 281                 if (!reps)
 282                         reps = -1;
 283         } else if (reps)
 284                 interval = 1;
 285
 286 #ifdef notyet
 287         if (todo & FORKSTAT)
 288                 doforkst();
 289 #endif
 290         if (todo & MEMSTAT)
 291                 domem();
 292         if (todo & ZMEMSTAT)
 293                 dozmem();
 294         if (todo & SUMSTAT)
 295                 dosum();
 296 #ifdef notyet
 297         if (todo & TIMESTAT)
 298                 dotimes();
 299 #endif
 300         if (todo & INTRSTAT)
 301                 dointr();
 302         if (todo & VMSTAT)
 303                 dovmstat(interval, reps);
 304         exit(0);
 305 }
 306
 307 char **
 308 getdrivedata(argv)
 309         char **argv;
 310 {
 311         if ((num_devices = getnumdevs()) < 0)
 312                 errx(1, "%s", devstat_errbuf);
 313
 314         cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
 315         last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
 316         bzero(cur.dinfo, sizeof(struct devinfo));
 317         bzero(last.dinfo, sizeof(struct devinfo));
 318
 319         if (getdevs(&cur) == -1)
 320                 errx(1, "%s", devstat_errbuf);
 321
 322         num_devices = cur.dinfo->numdevs;
 323         generation = cur.dinfo->generation;
 324
 325         specified_devices = (char **)malloc(sizeof(char *));
 326         for (num_devices_specified = 0; *argv; ++argv) {
 327                 if (isdigit(**argv))
 328                         break;
 329                 num_devices_specified++;
 330                 specified_devices = (char **)realloc(specified_devices,
 331                                                      sizeof(char *) *
 332                                                      num_devices_specified);
 333                 specified_devices[num_devices_specified - 1] = *argv;
 334         }
 335         dev_select = NULL;
 336
 337         if (nflag == 0 && maxshowdevs < num_devices_specified)
 338                         maxshowdevs = num_devices_specified;
 339
 340         /*
 341          * People are generally only interested in disk statistics when
 342          * they're running vmstat.  So, that's what we're going to give
 343          * them if they don't specify anything by default.  We'll also give
 344          * them any other random devices in the system so that we get to
 345          * maxshowdevs devices, if that many devices exist.  If the user
 346          * specifies devices on the command line, either through a pattern
 347          * match or by naming them explicitly, we will give the user only
 348          * those devices.
 349          */
 350         if ((num_devices_specified == 0) && (num_matches == 0)) {
 351                 if (buildmatch("da", &matches, &num_matches) != 0)
 352                         errx(1, "%s", devstat_errbuf);
 353
 354                 select_mode = DS_SELECT_ADD;
 355         } else
 356                 select_mode = DS_SELECT_ONLY;
 357
 358         /*
 359          * At this point, selectdevs will almost surely indicate that the
 360          * device list has changed, so we don't look for return values of 0
 361          * or 1.  If we get back -1, though, there is an error.
 362          */
 363         if (selectdevs(&dev_select, &num_selected, &num_selections,
 364                        &select_generation, generation, cur.dinfo->devices,
 365                        num_devices, matches, num_matches, specified_devices,
 366                        num_devices_specified, select_mode,
 367                        maxshowdevs, 0) == -1)
 368                 errx(1, "%s", devstat_errbuf);
 369
 370         return(argv);
 371 }
 372
 373 long
 374 getuptime()
 375 {
 376         static time_t now, boottime;
 377         time_t uptime;
 378
 379         if (boottime == 0)
 380                 kread(X_BOOTTIME, &boottime, sizeof(boottime));
 381         (void)time(&now);
 382         uptime = now - boottime;
 383         if (uptime <= 0 || uptime > 60*60*24*365*10)
 384                 errx(1, "time makes no sense; namelist must be wrong");
 385         return(uptime);
 386 }
 387
 388 int     hz, hdrcnt;
 389
 390 void
 391 dovmstat(interval, reps)
 392         u_int interval;
 393         int reps;
 394 {
 395         struct vmtotal total;
 396         time_t uptime, halfuptime;
 397         struct devinfo *tmp_dinfo;
 398         void needhdr();
 399         int mib[2];
 400         size_t size;
 401
 402         uptime = getuptime();
 403         halfuptime = uptime / 2;
 404         (void)signal(SIGCONT, needhdr);
 405
 406         if (namelist[X_STATHZ].n_type != 0 && namelist[X_STATHZ].n_value != 0)
 407                 kread(X_STATHZ, &hz, sizeof(hz));
 408         if (!hz)
 409                 kread(X_HZ, &hz, sizeof(hz));
 410
 411         for (hdrcnt = 1;;) {
 412                 if (!--hdrcnt)
 413                         printhdr();
 414                 kread(X_CPTIME, cur.cp_time, sizeof(cur.cp_time));
 415
 416                 tmp_dinfo = last.dinfo;
 417                 last.dinfo = cur.dinfo;
 418                 cur.dinfo = tmp_dinfo;
 419                 last.busy_time = cur.busy_time;
 420
 421                 /*
 422                  * Here what we want to do is refresh our device stats.
 423                  * getdevs() returns 1 when the device list has changed.
 424                  * If the device list has changed, we want to go through
 425                  * the selection process again, in case a device that we
 426                  * were previously displaying has gone away.
 427                  */
 428                 switch (getdevs(&cur)) {
 429                 case -1:
 430                         errx(1, "%s", devstat_errbuf);
 431                         break;
 432                 case 1: {
 433                         int retval;
 434
 435                         num_devices = cur.dinfo->numdevs;
 436                         generation = cur.dinfo->generation;
 437
 438                         retval = selectdevs(&dev_select, &num_selected,
 439                                             &num_selections, &select_generation,
 440                                             generation, cur.dinfo->devices,
 441                                             num_devices, matches, num_matches,
 442                                             specified_devices,
 443                                             num_devices_specified, select_mode,
 444                                             maxshowdevs, 0);
 445                         switch (retval) {
 446                         case -1:
 447                                 errx(1, "%s", devstat_errbuf);
 448                                 break;
 449                         case 1:
 450                                 printhdr();
 451                                 break;
 452                         default:
 453                                 break;
 454                         }
 455                 }
 456                 default:
 457                         break;
 458                 }
 459
 460                 kread(X_SUM, &sum, sizeof(sum));
 461                 size = sizeof(total);
 462                 mib[0] = CTL_VM;
 463                 mib[1] = VM_METER;
 464                 if (sysctl(mib, 2, &total, &size, NULL, 0) < 0) {
 465                         printf("Can't get kerninfo: %s\n", strerror(errno));
 466                         bzero(&total, sizeof(total));
 467                 }
 468                 (void)printf("%2d %1d %1d",
 469                     total.t_rq - 1, total.t_dw + total.t_pw, total.t_sw);
 470 #define vmstat_pgtok(a) ((a) * sum.v_page_size >> 10)
 471 #define rate(x) (((x) + halfuptime) / uptime)   /* round */
 472                 (void)printf(" %7ld %6ld ",
 473                     (long)vmstat_pgtok(total.t_avm), (long)vmstat_pgtok(total.t_free));
 474                 (void)printf("%4lu ",
 475                     (u_long)rate(sum.v_vm_faults - osum.v_vm_faults));
 476                 (void)printf("%3lu ",
 477                     (u_long)rate(sum.v_reactivated - osum.v_reactivated));
 478                 (void)printf("%3lu ",
 479                     (u_long)rate(sum.v_swapin + sum.v_vnodein -
 480                     (osum.v_swapin + osum.v_vnodein)));
 481                 (void)printf("%3lu ",
 482                     (u_long)rate(sum.v_swapout + sum.v_vnodeout -
 483                     (osum.v_swapout + osum.v_vnodeout)));
 484                 (void)printf("%3lu ",
 485                     (u_long)rate(sum.v_tfree - osum.v_tfree));
 486                 (void)printf("%3lu ",
 487                     (u_long)rate(sum.v_pdpages - osum.v_pdpages));
 488                 devstats();
 489                 (void)printf("%4lu %4lu %3lu ",
 490                     (u_long)rate(sum.v_intr - osum.v_intr),
 491                     (u_long)rate(sum.v_syscall - osum.v_syscall),
 492                     (u_long)rate(sum.v_swtch - osum.v_swtch));
 493                 cpustats();
 494                 (void)printf("\n");
 495                 (void)fflush(stdout);
 496                 if (reps >= 0 && --reps <= 0)
 497                         break;
 498                 osum = sum;
 499                 uptime = interval;
 500                 /*
 501                  * We round upward to avoid losing low-frequency events
 502                  * (i.e., >= 1 per interval but < 1 per second).
 503                  */
 504                 if (interval != 1)
 505                         halfuptime = (uptime + 1) / 2;
 506                 else
 507                         halfuptime = 0;
 508                 (void)sleep(interval);
 509         }
 510 }
 511
 512 void
 513 printhdr()
 514 {
 515         int i, num_shown;
 516
 517         num_shown = (num_selected < maxshowdevs) ? num_selected : maxshowdevs;
 518         (void)printf(" procs      memory      page%*s", 19, "");
 519         if (num_shown > 1)
 520                 (void)printf(" disks %*s", num_shown * 4 - 7, "");
 521         else if (num_shown == 1)
 522                 (void)printf("disk");
 523         (void)printf("   faults      cpu\n");
 524         (void)printf(" r b w     avm    fre  flt  re  pi  po  fr  sr ");
 525         for (i = 0; i < num_devices; i++)
 526                 if ((dev_select[i].selected)
 527                  && (dev_select[i].selected <= maxshowdevs))
 528                         (void)printf("%c%c%d ", dev_select[i].device_name[0],
 529                                      dev_select[i].device_name[1],
 530                                      dev_select[i].unit_number);
 531         (void)printf("  in   sy  cs us sy id\n");
 532         hdrcnt = winlines - 2;
 533 }
 534
 535 /*
 536  * Force a header to be prepended to the next output.
 537  */
 538 void
 539 needhdr()
 540 {
 541
 542         hdrcnt = 1;
 543 }
 544
 545 #ifdef notyet
 546 void
 547 dotimes()
 548 {
 549         u_int pgintime, rectime;
 550
 551         kread(X_REC, &rectime, sizeof(rectime));
 552         kread(X_PGIN, &pgintime, sizeof(pgintime));
 553         kread(X_SUM, &sum, sizeof(sum));
 554         (void)printf("%u reclaims, %u total time (usec)\n",
 555             sum.v_pgrec, rectime);
 556         (void)printf("average: %u usec / reclaim\n", rectime / sum.v_pgrec);
 557         (void)printf("\n");
 558         (void)printf("%u page ins, %u total time (msec)\n",
 559             sum.v_pgin, pgintime / 10);
 560         (void)printf("average: %8.1f msec / page in\n",
 561             pgintime / (sum.v_pgin * 10.0));
 562 }
 563 #endif
 564
 565 long
 566 pct(top, bot)
 567         long top, bot;
 568 {
 569         long ans;
 570
 571         if (bot == 0)
 572                 return(0);
 573         ans = (quad_t)top * 100 / bot;
 574         return (ans);
 575 }
 576
 577 #define PCT(top, bot) pct((long)(top), (long)(bot))
 578
 579 void
 580 dosum()
 581 {
 582         struct nchstats nchstats;
 583         long nchtotal;
 584
 585         kread(X_SUM, &sum, sizeof(sum));
 586         (void)printf("%9u cpu context switches\n", sum.v_swtch);
 587         (void)printf("%9u device interrupts\n", sum.v_intr);
 588         (void)printf("%9u software interrupts\n", sum.v_soft);
 589         (void)printf("%9u traps\n", sum.v_trap);
 590         (void)printf("%9u system calls\n", sum.v_syscall);
 591         (void)printf("%9u kernel threads created\n", sum.v_kthreads);
 592         (void)printf("%9u  fork() calls\n", sum.v_forks);
 593         (void)printf("%9u vfork() calls\n", sum.v_vforks);
 594         (void)printf("%9u rfork() calls\n", sum.v_rforks);
 595         (void)printf("%9u swap pager pageins\n", sum.v_swapin);
 596         (void)printf("%9u swap pager pages paged in\n", sum.v_swappgsin);
 597         (void)printf("%9u swap pager pageouts\n", sum.v_swapout);
 598         (void)printf("%9u swap pager pages paged out\n", sum.v_swappgsout);
 599         (void)printf("%9u vnode pager pageins\n", sum.v_vnodein);
 600         (void)printf("%9u vnode pager pages paged in\n", sum.v_vnodepgsin);
 601         (void)printf("%9u vnode pager pageouts\n", sum.v_vnodeout);
 602         (void)printf("%9u vnode pager pages paged out\n", sum.v_vnodepgsout);
 603         (void)printf("%9u page daemon wakeups\n", sum.v_pdwakeups);
 604         (void)printf("%9u pages examined by the page daemon\n", sum.v_pdpages);
 605         (void)printf("%9u pages reactivated\n", sum.v_reactivated);
 606         (void)printf("%9u copy-on-write faults\n", sum.v_cow_faults);
 607         (void)printf("%9u copy-on-write optimized faults\n", sum.v_cow_optim);
 608         (void)printf("%9u zero fill pages zeroed\n", sum.v_zfod);
 609         (void)printf("%9u zero fill pages prezeroed\n", sum.v_ozfod);
 610         (void)printf("%9u intransit blocking page faults\n", sum.v_intrans);
 611         (void)printf("%9u total VM faults taken\n", sum.v_vm_faults);
 612         (void)printf("%9u pages affected by kernel thread creation\n", sum.v_kthreadpages);
 613         (void)printf("%9u pages affected by  fork()\n", sum.v_forkpages);
 614         (void)printf("%9u pages affected by vfork()\n", sum.v_vforkpages);
 615         (void)printf("%9u pages affected by rfork()\n", sum.v_rforkpages);
 616         (void)printf("%9u pages freed\n", sum.v_tfree);
 617         (void)printf("%9u pages freed by daemon\n", sum.v_dfree);
 618         (void)printf("%9u pages freed by exiting processes\n", sum.v_pfree);
 619         (void)printf("%9u pages active\n", sum.v_active_count);
 620         (void)printf("%9u pages inactive\n", sum.v_inactive_count);
 621         (void)printf("%9u pages in VM cache\n", sum.v_cache_count);
 622         (void)printf("%9u pages wired down\n", sum.v_wire_count);
 623         (void)printf("%9u pages free\n", sum.v_free_count);
 624         (void)printf("%9u bytes per page\n", sum.v_page_size);
 625         kread(X_NCHSTATS, &nchstats, sizeof(nchstats));
 626         nchtotal = nchstats.ncs_goodhits + nchstats.ncs_neghits +
 627             nchstats.ncs_badhits + nchstats.ncs_falsehits +
 628             nchstats.ncs_miss + nchstats.ncs_long;
 629         (void)printf("%9ld total name lookups\n", nchtotal);
 630         (void)printf(
 631             "%9s cache hits (%ld%% pos + %ld%% neg) system %ld%% per-directory\n",
 632             "", PCT(nchstats.ncs_goodhits, nchtotal),
 633             PCT(nchstats.ncs_neghits, nchtotal),
 634             PCT(nchstats.ncs_pass2, nchtotal));
 635         (void)printf("%9s deletions %ld%%, falsehits %ld%%, toolong %ld%%\n", "",
 636             PCT(nchstats.ncs_badhits, nchtotal),
 637             PCT(nchstats.ncs_falsehits, nchtotal),
 638             PCT(nchstats.ncs_long, nchtotal));
 639 }
 640
 641 #ifdef notyet
 642 void
 643 doforkst()
 644 {
 645         struct forkstat fks;
 646
 647         kread(X_FORKSTAT, &fks, sizeof(struct forkstat));
 648         (void)printf("%d forks, %d pages, average %.2f\n",
 649             fks.cntfork, fks.sizfork, (double)fks.sizfork / fks.cntfork);
 650         (void)printf("%d vforks, %d pages, average %.2f\n",
 651             fks.cntvfork, fks.sizvfork, (double)fks.sizvfork / fks.cntvfork);
 652 }
 653 #endif
 654
 655 static void
 656 devstats()
 657 {
 658         register int dn, state;
 659         long double transfers_per_second;
 660         long double busy_seconds;
 661         long tmp;
 662
 663         for (state = 0; state < CPUSTATES; ++state) {
 664                 tmp = cur.cp_time[state];
 665                 cur.cp_time[state] -= last.cp_time[state];
 666                 last.cp_time[state] = tmp;
 667         }
 668
 669         busy_seconds = compute_etime(cur.busy_time, last.busy_time);
 670
 671         for (dn = 0; dn < num_devices; dn++) {
 672                 int di;
 673
 674                 if ((dev_select[dn].selected == 0)
 675                  || (dev_select[dn].selected > maxshowdevs))
 676                         continue;
 677
 678                 di = dev_select[dn].position;
 679
 680                 if (compute_stats(&cur.dinfo->devices[di],
 681                                   &last.dinfo->devices[di], busy_seconds,
 682                                   NULL, NULL, NULL,
 683                                   NULL, &transfers_per_second, NULL,
 684                                   NULL, NULL) != 0)
 685                         errx(1, "%s", devstat_errbuf);
 686
 687                 printf("%3.0Lf ", transfers_per_second);
 688         }
 689 }
 690
 691 void
 692 cpustats()
 693 {
 694         register int state;
 695         double pct, total;
 696
 697         total = 0;
 698         for (state = 0; state < CPUSTATES; ++state)
 699                 total += cur.cp_time[state];
 700         if (total)
 701                 pct = 100 / total;
 702         else
 703                 pct = 0;
 704         (void)printf("%2.0f ", (cur.cp_time[CP_USER] +
 705                                 cur.cp_time[CP_NICE]) * pct);
 706         (void)printf("%2.0f ", (cur.cp_time[CP_SYS] +
 707                                 cur.cp_time[CP_INTR]) * pct);
 708         (void)printf("%2.0f", cur.cp_time[CP_IDLE] * pct);
 709 }
 710
 711 void
 712 dointr()
 713 {
 714         register u_long *intrcnt, uptime;
 715         register u_int64_t inttotal;
 716         register int nintr, inamlen;
 717         register char *intrname;
 718
 719         uptime = getuptime();
 720         nintr = namelist[X_EINTRCNT].n_value - namelist[X_INTRCNT].n_value;
 721         inamlen =
 722             namelist[X_EINTRNAMES].n_value - namelist[X_INTRNAMES].n_value;
 723         intrcnt = malloc((size_t)nintr);
 724         intrname = malloc((size_t)inamlen);
 725         if (intrcnt == NULL || intrname == NULL)
 726                 errx(1, "malloc");
 727         kread(X_INTRCNT, intrcnt, (size_t)nintr);
 728         kread(X_INTRNAMES, intrname, (size_t)inamlen);
 729         (void)printf("interrupt                   total       rate\n");
 730         inttotal = 0;
 731         nintr /= sizeof(long);
 732         while (--nintr >= 0) {
 733                 if (*intrcnt)
 734                         (void)printf("%-12s %20lu %10lu\n", intrname,
 735                             *intrcnt, *intrcnt / uptime);
 736                 intrname += strlen(intrname) + 1;
 737                 inttotal += *intrcnt++;
 738         }
 739         (void)printf("Total        %20llu %10llu\n", inttotal,
 740                         inttotal / (u_int64_t) uptime);
 741 }
 742
 743 #define MAX_KMSTATS     200
 744
 745 void
 746 domem()
 747 {
 748         register struct kmembuckets *kp;
 749         register struct malloc_type *ks;
 750         register int i, j;
 751         int len, size, first, nkms;
 752         long totuse = 0, totfree = 0, totreq = 0;
 753         const char *name;
 754         struct malloc_type kmemstats[MAX_KMSTATS], *kmsp;
 755         char buf[1024];
 756         struct kmembuckets buckets[MINBUCKET + 16];
 757
 758         kread(X_KMEMBUCKETS, buckets, sizeof(buckets));
 759         kread(X_KMEMSTATISTICS, &kmsp, sizeof(kmsp));
 760         for (nkms = 0; nkms < MAX_KMSTATS && kmsp != NULL; nkms++) {
 761                 if (sizeof(kmemstats[0]) != kvm_read(kd, (u_long)kmsp,
 762                     &kmemstats[nkms], sizeof(kmemstats[0])))
 763                         err(1, "kvm_read(%p)", (void *)kmsp);
 764                 if (sizeof(buf) !=  kvm_read(kd,
 765                     (u_long)kmemstats[nkms].ks_shortdesc, buf, sizeof(buf)))
 766                         err(1, "kvm_read(%p)",
 767                             (void *)kmemstats[nkms].ks_shortdesc);
 768                 buf[sizeof(buf) - 1] = '\0';
 769                 kmemstats[nkms].ks_shortdesc = strdup(buf);
 770                 kmsp = kmemstats[nkms].ks_next;
 771         }
 772         if (kmsp != NULL)
 773                 warnx("truncated to the first %d memory types", nkms);
 774         (void)printf("Memory statistics by bucket size\n");
 775         (void)printf(
 776             "Size   In Use   Free   Requests  HighWater  Couldfree\n");
 777         for (i = MINBUCKET, kp = &buckets[i]; i < MINBUCKET + 16; i++, kp++) {
 778                 if (kp->kb_calls == 0)
 779                         continue;
 780                 size = 1 << i;
 781                 if(size < 1024)
 782                         (void)printf("%4d",size);
 783                 else
 784                         (void)printf("%3dK",size>>10);
 785                 (void)printf(" %8ld %6ld %10lld %7ld %10ld\n",
 786                         kp->kb_total - kp->kb_totalfree,
 787                         kp->kb_totalfree, kp->kb_calls,
 788                         kp->kb_highwat, kp->kb_couldfree);
 789                 totfree += size * kp->kb_totalfree;
 790         }
 791
 792         (void)printf("\nMemory usage type by bucket size\n");
 793         (void)printf("Size  Type(s)\n");
 794         kp = &buckets[MINBUCKET];
 795         for (j =  1 << MINBUCKET; j < 1 << (MINBUCKET + 16); j <<= 1, kp++) {
 796                 if (kp->kb_calls == 0)
 797                         continue;
 798                 first = 1;
 799                 len = 8;
 800                 for (i = 0, ks = &kmemstats[0]; i < nkms; i++, ks++) {
 801                         if (ks->ks_calls == 0)
 802                                 continue;
 803                         if ((ks->ks_size & j) == 0)
 804                                 continue;
 805                         name = ks->ks_shortdesc;
 806                         len += 2 + strlen(name);
 807                         if (first && j < 1024)
 808                                 printf("%4d  %s", j, name);
 809                         else if (first)
 810                                 printf("%3dK  %s", j>>10, name);
 811                         else
 812                                 printf(",");
 813                         if (len >= 79) {
 814                                 printf("\n\t ");
 815                                 len = 10 + strlen(name);
 816                         }
 817                         if (!first)
 818                                 printf(" %s", name);
 819                         first = 0;
 820                 }
 821                 printf("\n");
 822         }
 823
 824         (void)printf(
 825             "\nMemory statistics by type                          Type  Kern\n");
 826         (void)printf(
 827 "        Type  InUse MemUse HighUse  Limit Requests Limit Limit Size(s)\n");
 828         for (i = 0, ks = &kmemstats[0]; i < nkms; i++, ks++) {
 829                 if (ks->ks_calls == 0)
 830                         continue;
 831                 (void)printf("%13s%6ld%6ldK%7ldK%6ldK%9lld%5u%6u",
 832                     ks->ks_shortdesc,
 833                     ks->ks_inuse, (ks->ks_memuse + 1023) / 1024,
 834                     (ks->ks_maxused + 1023) / 1024,
 835                     (ks->ks_limit + 1023) / 1024, ks->ks_calls,
 836                     ks->ks_limblocks, ks->ks_mapblocks);
 837                 first = 1;
 838                 for (j =  1 << MINBUCKET; j < 1 << (MINBUCKET + 16); j <<= 1) {
 839                         if ((ks->ks_size & j) == 0)
 840                                 continue;
 841                         if (first)
 842                                 printf("  ");
 843                         else
 844                                 printf(",");
 845                         if(j<1024)
 846                                 printf("%d",j);
 847                         else
 848                                 printf("%dK",j>>10);
 849                         first = 0;
 850                 }
 851                 printf("\n");
 852                 totuse += ks->ks_memuse;
 853                 totreq += ks->ks_calls;
 854         }
 855         (void)printf("\nMemory Totals:  In Use    Free    Requests\n");
 856         (void)printf("              %7ldK %6ldK    %8ld\n",
 857              (totuse + 1023) / 1024, (totfree + 1023) / 1024, totreq);
 858 }
 859
 860 void
 861 dozmem()
 862 {
 863         char *buf;
 864         size_t bufsize;
 865
 866         buf = NULL;
 867         bufsize = 1024;
 868         for (;;) {
 869                 if ((buf = realloc(buf, bufsize)) == NULL)
 870                         err(1, "realloc()");
 871                 if (sysctlbyname("vm.zone", buf, &bufsize, 0, NULL) == 0)
 872                         break;
 873                 if (errno != ENOMEM)
 874                         err(1, "sysctl()");
 875                 bufsize *= 2;
 876         }
 877         buf[bufsize] = '\0'; /* play it safe */
 878         (void)printf("%s\n\n", buf);
 879         free(buf);
 880 }
 881
 882 /*
 883  * kread reads something from the kernel, given its nlist index.
 884  */
 885 void
 886 kread(nlx, addr, size)
 887         int nlx;
 888         void *addr;
 889         size_t size;
 890 {
 891         char *sym;
 892
 893         if (namelist[nlx].n_type == 0 || namelist[nlx].n_value == 0) {
 894                 sym = namelist[nlx].n_name;
 895                 if (*sym == '_')
 896                         ++sym;
 897                 errx(1, "symbol %s not defined", sym);
 898         }
 899         if (kvm_read(kd, namelist[nlx].n_value, addr, size) != size) {
 900                 sym = namelist[nlx].n_name;
 901                 if (*sym == '_')
 902                         ++sym;
 903                 errx(1, "%s: %s", sym, kvm_geterr(kd));
 904         }
 905 }
 906
 907 void
 908 usage()
 909 {
 910         (void)fprintf(stderr, "%s%s",
 911                 "usage: vmstat [-imsz] [-c count] [-M core] [-N system] [-w wait]\n",
 912                 "              [-n devs] [disks]\n");
 913         exit(1);
 914 }