usr.bin/systat/iostat.c

   1 /*
   2  * Copyright (c) 1998 Kenneth D. Merry.
   3  * 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. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/usr.bin/systat/iostat.c,v 1.9.2.1 2000/07/02 10:03:17 ps Exp $
  29  * $DragonFly: src/usr.bin/systat/iostat.c,v 1.7 2008/11/10 04:59:45 swildner Exp $
  30  *
  31  * @(#)iostat.c 8.1 (Berkeley) 6/6/93
  32  */
  33 /*
  34  * Copyright (c) 1980, 1992, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  */
  65
  66 #include <sys/param.h>
  67
  68 #include <err.h>
  69 #include <devstat.h>
  70 #include <kinfo.h>
  71 #include <paths.h>
  72 #include <stdlib.h>
  73 #include <string.h>
  74 #include "systat.h"
  75 #include "extern.h"
  76 #include "devs.h"
  77
  78 struct statinfo cur, last;
  79 static struct kinfo_cputime cp_time, old_cp_time;
  80
  81 static  int linesperregion;
  82 static  int numbers = 0;                /* default display bar graphs */
  83 static  int kbpt = 0;                   /* default ms/seek shown */
  84
  85 static int barlabels(int);
  86 static void histogram(long double, int, double);
  87 static int numlabels(int);
  88 static int devstats(int, int, int);
  89 static void stat1(int, uint64_t, uint64_t);
  90
  91 WINDOW *
  92 openiostat(void)
  93 {
  94         return (subwin(stdscr, LINES-1-5, 0, 5, 0));
  95 }
  96
  97 void
  98 closeiostat(WINDOW *w)
  99 {
 100         if (w == NULL)
 101                 return;
 102         wclear(w);
 103         wrefresh(w);
 104         delwin(w);
 105 }
 106
 107 int
 108 initiostat(void)
 109 {
 110         if ((num_devices = getnumdevs()) < 0)
 111                 return(0);
 112
 113         cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
 114         last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
 115         bzero(cur.dinfo, sizeof(struct devinfo));
 116         bzero(last.dinfo, sizeof(struct devinfo));
 117
 118         /*
 119          * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
 120          * how to calculate it, though.
 121          */
 122         if (dsinit(100, &cur, &last, NULL) != 1)
 123                 return(0);
 124
 125         return(1);
 126 }
 127
 128 void
 129 fetchiostat(void)
 130 {
 131         struct devinfo *tmp_dinfo;
 132
 133         if (kinfo_get_sched_cputime(&cp_time))
 134                 err(1, "kinfo_get_sched_cputime");
 135         tmp_dinfo = last.dinfo;
 136         last.dinfo = cur.dinfo;
 137         cur.dinfo = tmp_dinfo;
 138
 139         last.busy_time = cur.busy_time;
 140
 141         /*
 142          * Here what we want to do is refresh our device stats.
 143          * getdevs() returns 1 when the device list has changed.
 144          * If the device list has changed, we want to go through
 145          * the selection process again, in case a device that we
 146          * were previously displaying has gone away.
 147          */
 148         switch (getdevs(&cur)) {
 149         case -1:
 150                 errx(1, "%s", devstat_errbuf);
 151                 break;
 152         case 1:
 153                 cmdiostat("refresh", NULL);
 154                 break;
 155         default:
 156                 break;
 157         }
 158         num_devices = cur.dinfo->numdevs;
 159         generation = cur.dinfo->generation;
 160
 161 }
 162
 163 #define INSET   10
 164
 165 void
 166 labeliostat(void)
 167 {
 168         int row;
 169
 170         row = 0;
 171         wmove(wnd, row, 0); wclrtobot(wnd);
 172         mvwaddstr(wnd, row++, INSET,
 173             "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
 174         mvwaddstr(wnd, row++, 0, "cpu  user|");
 175         mvwaddstr(wnd, row++, 0, "     nice|");
 176         mvwaddstr(wnd, row++, 0, "   system|");
 177         mvwaddstr(wnd, row++, 0, "interrupt|");
 178         mvwaddstr(wnd, row++, 0, "     idle|");
 179         if (numbers)
 180                 row = numlabels(row + 1);
 181         else
 182                 row = barlabels(row + 1);
 183 }
 184
 185 static int
 186 numlabels(int row)
 187 {
 188         int i, _col, regions, ndrives;
 189         char tmpstr[10];
 190
 191 #define COLWIDTH        17
 192 #define DRIVESPERLINE   ((wnd->_maxx - INSET) / COLWIDTH)
 193         for (ndrives = 0, i = 0; i < num_devices; i++)
 194                 if (dev_select[i].selected)
 195                         ndrives++;
 196         regions = howmany(ndrives, DRIVESPERLINE);
 197         /*
 198          * Deduct -regions for blank line after each scrolling region.
 199          */
 200         linesperregion = (wnd->_maxy - row - regions) / regions;
 201         /*
 202          * Minimum region contains space for two
 203          * label lines and one line of statistics.
 204          */
 205         if (linesperregion < 3)
 206                 linesperregion = 3;
 207         _col = INSET;
 208         for (i = 0; i < num_devices; i++)
 209                 if (dev_select[i].selected) {
 210                         if (_col + COLWIDTH >= wnd->_maxx - INSET) {
 211                                 _col = INSET, row += linesperregion + 1;
 212                                 if (row > wnd->_maxy - (linesperregion + 1))
 213                                         break;
 214                         }
 215                         sprintf(tmpstr, "%s%d", dev_select[i].device_name,
 216                                 dev_select[i].unit_number);
 217                         mvwaddstr(wnd, row, _col + 4, tmpstr);
 218                         mvwaddstr(wnd, row + 1, _col, "  KB/t tps  MB/s ");
 219                         _col += COLWIDTH;
 220                 }
 221         if (_col)
 222                 row += linesperregion + 1;
 223         return (row);
 224 }
 225
 226 static int
 227 barlabels(int row)
 228 {
 229         int i;
 230         char tmpstr[10];
 231
 232         mvwaddstr(wnd, row++, INSET,
 233             "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
 234         linesperregion = 2 + kbpt;
 235         for (i = 0; i < num_devices; i++)
 236                 if (dev_select[i].selected) {
 237                         if (row > wnd->_maxy - linesperregion)
 238                                 break;
 239                         sprintf(tmpstr, "%s%d", dev_select[i].device_name,
 240                                 dev_select[i].unit_number);
 241                         mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
 242                                   tmpstr);
 243                         mvwaddstr(wnd, row++, 0, "      tps|");
 244                         if (kbpt)
 245                                 mvwaddstr(wnd, row++, 0, "     KB/t|");
 246                 }
 247         return (row);
 248 }
 249
 250
 251 void
 252 showiostat(void)
 253 {
 254         int i, row, _col;
 255         struct kinfo_cputime diff_cp_time;
 256         uint64_t cp_total;
 257
 258         diff_cp_time.cp_user = cp_time.cp_user - old_cp_time.cp_user;
 259         diff_cp_time.cp_nice = cp_time.cp_nice - old_cp_time.cp_nice;
 260         diff_cp_time.cp_sys = cp_time.cp_sys - old_cp_time.cp_sys;
 261         diff_cp_time.cp_intr = cp_time.cp_intr - old_cp_time.cp_intr;
 262         diff_cp_time.cp_idle = cp_time.cp_idle - old_cp_time.cp_idle;
 263         old_cp_time = cp_time;
 264
 265         row = 1;
 266         cp_total = diff_cp_time.cp_user + diff_cp_time.cp_nice +
 267             diff_cp_time.cp_sys + diff_cp_time.cp_intr + diff_cp_time.cp_idle;
 268         stat1(row++, diff_cp_time.cp_user, cp_total);
 269         stat1(row++, diff_cp_time.cp_nice, cp_total);
 270         stat1(row++, diff_cp_time.cp_sys,  cp_total);
 271         stat1(row++, diff_cp_time.cp_intr, cp_total);
 272         stat1(row++, diff_cp_time.cp_idle, cp_total);
 273         if (!numbers) {
 274                 row += 2;
 275                 for (i = 0; i < num_devices; i++)
 276                         if (dev_select[i].selected) {
 277                                 if (row > wnd->_maxy - linesperregion)
 278                                         break;
 279                                 row = devstats(row, INSET, i);
 280                         }
 281                 return;
 282         }
 283         _col = INSET;
 284         wmove(wnd, row + linesperregion, 0);
 285         wdeleteln(wnd);
 286         wmove(wnd, row + 3, 0);
 287         winsertln(wnd);
 288         for (i = 0; i < num_devices; i++)
 289                 if (dev_select[i].selected) {
 290                         if (_col + COLWIDTH >= wnd->_maxx - INSET) {
 291                                 _col = INSET, row += linesperregion + 1;
 292                                 if (row > wnd->_maxy - (linesperregion + 1))
 293                                         break;
 294                                 wmove(wnd, row + linesperregion, 0);
 295                                 wdeleteln(wnd);
 296                                 wmove(wnd, row + 3, 0);
 297                                 winsertln(wnd);
 298                         }
 299                         (void) devstats(row + 3, _col, i);
 300                         _col += COLWIDTH;
 301                 }
 302 }
 303
 304 static int
 305 devstats(int row, int _col, int dn)
 306 {
 307         long double transfers_per_second;
 308         long double kb_per_transfer, mb_per_second;
 309         long double busy_seconds;
 310         int di;
 311
 312         di = dev_select[dn].position;
 313
 314         busy_seconds = compute_etime(cur.busy_time, last.busy_time);
 315
 316         if (compute_stats(&cur.dinfo->devices[di], &last.dinfo->devices[di],
 317                           busy_seconds, NULL, NULL, NULL,
 318                           &kb_per_transfer, &transfers_per_second,
 319                           &mb_per_second, NULL, NULL) != 0)
 320                 errx(1, "%s", devstat_errbuf);
 321
 322         if (numbers) {
 323                 mvwprintw(wnd, row, _col, " %5.2Lf %3.0Lf %5.2Lf ",
 324                          kb_per_transfer, transfers_per_second,
 325                          mb_per_second);
 326                 return(row);
 327         }
 328         wmove(wnd, row++, _col);
 329         histogram(mb_per_second, 50, .5);
 330         wmove(wnd, row++, _col);
 331         histogram(transfers_per_second, 50, .5);
 332         if (kbpt) {
 333                 wmove(wnd, row++, _col);
 334                 histogram(kb_per_transfer, 50, .5);
 335         }
 336
 337         return(row);
 338
 339 }
 340
 341 static void
 342 stat1(int row, uint64_t difference, uint64_t total)
 343 {
 344         double dtime;
 345
 346         if (total > 0)
 347                 dtime = 100.0 * difference / total;
 348         else
 349                 dtime = 0;
 350         wmove(wnd, row, INSET);
 351 #define CPUSCALE        0.5
 352         histogram(dtime, 50, CPUSCALE);
 353 }
 354
 355 static void
 356 histogram(long double val, int colwidth, double scale)
 357 {
 358         char buf[10];
 359         int k;
 360         int v = (int)(val * scale) + 0.5;
 361
 362         if (val <= 0)
 363                 v = 0;
 364         k = MIN(v, colwidth);
 365         if (v > colwidth) {
 366                 snprintf(buf, sizeof(buf), "%5.2Lf", val);
 367                 k -= strlen(buf);
 368                 while (k--)
 369                         waddch(wnd, 'X');
 370                 waddstr(wnd, buf);
 371                 return;
 372         }
 373         while (k--)
 374                 waddch(wnd, 'X');
 375         wclrtoeol(wnd);
 376 }
 377
 378 int
 379 cmdiostat(const char *cmd, char *args)
 380 {
 381
 382         if (prefix(cmd, "kbpt"))
 383                 kbpt = !kbpt;
 384         else if (prefix(cmd, "numbers"))
 385                 numbers = 1;
 386         else if (prefix(cmd, "bars"))
 387                 numbers = 0;
 388         else if (!dscmd(cmd, args, 100, &cur))
 389                 return (0);
 390         wclear(wnd);
 391         labeliostat();
 392         refresh();
 393         return (1);
 394 }