granicus.if.org Git - sysstat/blob - mpstat.c

   1 /*
   2  * mpstat: per-processor statistics
   3  * (C) 2000-2015 by Sebastien GODARD (sysstat <at> orange.fr)
   4  *
   5  ***************************************************************************
   6  * This program is free software; you can redistribute it and/or modify it *
   7  * under the terms of the GNU General Public License as published  by  the *
   8  * Free Software Foundation; either version 2 of the License, or (at  your *
   9  * option) any later version.                                              *
  10  *                                                                         *
  11  * This program is distributed in the hope that it  will  be  useful,  but *
  12  * WITHOUT ANY WARRANTY; without the implied warranty  of  MERCHANTABILITY *
  13  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
  14  * for more details.                                                       *
  15  *                                                                         *
  16  * You should have received a copy of the GNU General Public License along *
  17  * with this program; if not, write to the Free Software Foundation, Inc., *
  18  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA                   *
  19  ***************************************************************************
  20  */
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <signal.h>
  27 #include <errno.h>
  28 #include <ctype.h>
  29 #include <sys/utsname.h>
  30
  31 #include "version.h"
  32 #include "mpstat.h"
  33 #include "common.h"
  34 #include "rd_stats.h"
  35 #include "count.h"
  36
  37 #ifdef USE_NLS
  38 #include <locale.h>
  39 #include <libintl.h>
  40 #define _(string) gettext(string)
  41 #else
  42 #define _(string) (string)
  43 #endif
  44
  45 #define SCCSID "@(#)sysstat-" VERSION ": "  __FILE__ " compiled " __DATE__ " " __TIME__
  46 char *sccsid(void) { return (SCCSID); }
  47
  48 unsigned long long uptime[3] = {0, 0, 0};
  49 unsigned long long uptime0[3] = {0, 0, 0};
  50
  51 /* NOTE: Use array of _char_ for bitmaps to avoid endianness problems...*/
  52 unsigned char *cpu_bitmap;      /* Bit 0: Global; Bit 1: 1st proc; etc. */
  53
  54 /* Structures used to store stats */
  55 struct stats_cpu *st_cpu[3];
  56 struct stats_irq *st_irq[3];
  57 struct stats_irqcpu *st_irqcpu[3];
  58 struct stats_irqcpu *st_softirqcpu[3];
  59
  60 struct tm mp_tstamp[3];
  61
  62 /* Activity flag */
  63 unsigned int actflags = 0;
  64
  65 unsigned int flags = 0;
  66
  67 /* Interval and count parameters */
  68 long interval = -1, count = 0;
  69
  70 /* Nb of processors on the machine */
  71 int cpu_nr = 0;
  72 /* Nb of interrupts per processor */
  73 int irqcpu_nr = 0;
  74 /* Nb of soft interrupts per processor */
  75 int softirqcpu_nr = 0;
  76
  77 struct sigaction alrm_act, int_act;
  78 int sigint_caught = 0;
  79
  80 /*
  81  ***************************************************************************
  82  * Print usage and exit
  83  *
  84  * IN:
  85  * @progname    Name of sysstat command
  86  ***************************************************************************
  87  */
  88 void usage(char *progname)
  89 {
  90         fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ]\n"),
  91                 progname);
  92
  93         fprintf(stderr, _("Options are:\n"
  94                           "[ -A ] [ -u ] [ -V ] [ -I { SUM | CPU | SCPU | ALL } ]\n"
  95                           "[ -P { <cpu> [,...] | ON | ALL } ]\n"));
  96         exit(1);
  97 }
  98
  99 /*
 100  ***************************************************************************
 101  * SIGALRM signal handler. No need to reset the handler here.
 102  *
 103  * IN:
 104  * @sig Signal number.
 105  ***************************************************************************
 106  */
 107 void alarm_handler(int sig)
 108 {
 109         alarm(interval);
 110 }
 111
 112 /*
 113  ***************************************************************************
 114  * SIGINT signal handler.
 115  *
 116  * IN:
 117  * @sig Signal number.
 118  **************************************************************************
 119  */
 120 void int_handler(int sig)
 121 {
 122         sigint_caught = 1;
 123 }
 124
 125 /*
 126  ***************************************************************************
 127  * Allocate stats structures and cpu bitmap.
 128  *
 129  * IN:
 130  * @nr_cpus     Number of CPUs. This is the real number of available CPUs + 1
 131  *              because we also have to allocate a structure for CPU 'all'.
 132  ***************************************************************************
 133  */
 134 void salloc_mp_struct(int nr_cpus)
 135 {
 136         int i;
 137
 138         for (i = 0; i < 3; i++) {
 139
 140                 if ((st_cpu[i] = (struct stats_cpu *) malloc(STATS_CPU_SIZE * nr_cpus))
 141                     == NULL) {
 142                         perror("malloc");
 143                         exit(4);
 144                 }
 145                 memset(st_cpu[i], 0, STATS_CPU_SIZE * nr_cpus);
 146
 147                 if ((st_irq[i] = (struct stats_irq *) malloc(STATS_IRQ_SIZE * nr_cpus))
 148                     == NULL) {
 149                         perror("malloc");
 150                         exit(4);
 151                 }
 152                 memset(st_irq[i], 0, STATS_IRQ_SIZE * nr_cpus);
 153
 154                 if ((st_irqcpu[i] = (struct stats_irqcpu *) malloc(STATS_IRQCPU_SIZE * nr_cpus * irqcpu_nr))
 155                     == NULL) {
 156                         perror("malloc");
 157                         exit(4);
 158                 }
 159                 memset(st_irqcpu[i], 0, STATS_IRQCPU_SIZE * nr_cpus * irqcpu_nr);
 160
 161                 if ((st_softirqcpu[i] = (struct stats_irqcpu *) malloc(STATS_IRQCPU_SIZE * nr_cpus * softirqcpu_nr))
 162                      == NULL) {
 163                         perror("malloc");
 164                         exit(4);
 165                 }
 166                 memset(st_softirqcpu[i], 0, STATS_IRQCPU_SIZE * nr_cpus * softirqcpu_nr);
 167         }
 168
 169         if ((cpu_bitmap = (unsigned char *) malloc((nr_cpus >> 3) + 1)) == NULL) {
 170                 perror("malloc");
 171                 exit(4);
 172         }
 173         memset(cpu_bitmap, 0, (nr_cpus >> 3) + 1);
 174 }
 175
 176 /*
 177  ***************************************************************************
 178  * Free structures and bitmap.
 179  ***************************************************************************
 180  */
 181 void sfree_mp_struct(void)
 182 {
 183         int i;
 184
 185         for (i = 0; i < 3; i++) {
 186                 free(st_cpu[i]);
 187                 free(st_irq[i]);
 188                 free(st_irqcpu[i]);
 189                 free(st_softirqcpu[i]);
 190         }
 191
 192         free(cpu_bitmap);
 193 }
 194
 195 /*
 196  ***************************************************************************
 197  * Display per CPU statistics.
 198  *
 199  * IN:
 200  * @st_ic       Array for per-CPU statistics.
 201  * @ic_nr       Number of interrupts (hard or soft) per CPU.
 202  * @dis         TRUE if a header line must be printed.
 203  * @itv         Interval value.
 204  * @prev        Position in array where statistics used as reference are.
 205  *              Stats used as reference may be the previous ones read, or
 206  *              the very first ones when calculating the average.
 207  * @curr        Position in array where current statistics will be saved.
 208  * @prev_string String displayed at the beginning of a header line. This is
 209  *              the timestamp of the previous sample, or "Average" when
 210  *              displaying average stats.
 211  * @curr_string String displayed at the beginning of current sample stats.
 212  *              This is the timestamp of the current sample, or "Average"
 213  *              when displaying average stats.
 214  ***************************************************************************
 215  */
 216 void write_irqcpu_stats(struct stats_irqcpu *st_ic[], int ic_nr, int dis,
 217                         unsigned long long itv, int prev, int curr,
 218                         char *prev_string, char *curr_string)
 219 {
 220         struct stats_cpu *scc;
 221         int j = 0, offset, cpu, colwidth[NR_IRQS];
 222         struct stats_irqcpu *p, *q, *p0, *q0;
 223
 224         /*
 225         * Check if number of interrupts has changed.
 226         * NB: A null interval value indicates that we are
 227          * displaying statistics since system startup.
 228          */
 229         if (!dis && interval) {
 230                 do {
 231                         p0 = st_ic[curr] + j;
 232                         if (p0->irq_name[0] != '\0') {
 233                                 q0 = st_ic[prev] + j;
 234                                 if (strcmp(p0->irq_name, q0->irq_name)) {
 235                                         /* These are two different irq */
 236                                         j = -2;
 237                                 }
 238                         }
 239                         j++;
 240                 }
 241                 while ((j > 0) && (j <= ic_nr));
 242         }
 243
 244         if (dis || (j < 0)) {
 245                 /* Print header */
 246                 printf("\n%-11s  CPU", prev_string);
 247                 for (j = 0; j < ic_nr; j++) {
 248                         p0 = st_ic[curr] + j;
 249                         if (p0->irq_name[0] != '\0') {  /* Nb of irq per proc may have varied... */
 250                                 printf(" %8s/s", p0->irq_name);
 251                         }
 252                 }
 253                 printf("\n");
 254         }
 255
 256         /* Calculate column widths */
 257         for (j = 0; j < ic_nr; j++) {
 258                 p0 = st_ic[curr] + j;
 259                 if (p0->irq_name[0] != '\0') {
 260                         /* Width is IRQ name + 2 for the trailing "/s" */
 261                         colwidth[j] = strlen(p0->irq_name) + 2;
 262                         /*
 263                          * Normal space for printing a number is 11 chars
 264                          * (space + 10 digits including the period).
 265                          */
 266                         if (colwidth[j] < 10) {
 267                                 colwidth[j] = 10;
 268                         }
 269                 }
 270         }
 271
 272         for (cpu = 1; cpu <= cpu_nr; cpu++) {
 273
 274                 scc = st_cpu[curr] + cpu;
 275
 276                 /*
 277                  * Check if we want stats about this CPU.
 278                  * CPU must have been explicitly selected using option -P,
 279                  * else we display every CPU.
 280                  */
 281                 if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))) && USE_P_OPTION(flags))
 282                         continue;
 283
 284                 if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 285                      scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 286                      scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 287
 288                         /* Offline CPU found */
 289
 290                         if (DISPLAY_ONLINE_CPU(flags))
 291                                 continue;
 292                 }
 293
 294                 printf("%-11s", curr_string);
 295                 cprintf_in(IS_INT, "  %3d", "", cpu - 1);
 296
 297                 for (j = 0; j < ic_nr; j++) {
 298                         p0 = st_ic[curr] + j;   /* irq field set only for proc #0 */
 299                         /*
 300                          * An empty string for irq name means it is a remaining interrupt
 301                          * which is no longer used, for example because the
 302                          * number of interrupts has decreased in /proc/interrupts.
 303                          */
 304                         if (p0->irq_name[0] != '\0') {
 305                                 q0 = st_ic[prev] + j;
 306                                 offset = j;
 307
 308                                 /*
 309                                  * If we want stats for the time since system startup,
 310                                  * we have p0->irq != q0->irq, since q0 structure is
 311                                  * completely set to zero.
 312                                  */
 313                                 if (strcmp(p0->irq_name, q0->irq_name) && interval) {
 314                                         if (j)
 315                                                 offset = j - 1;
 316                                         q0 = st_ic[prev] + offset;
 317                                         if (strcmp(p0->irq_name, q0->irq_name) && (j + 1 < ic_nr))
 318                                                 offset = j + 1;
 319                                         q0 = st_ic[prev] + offset;
 320                                 }
 321
 322                                 if (!strcmp(p0->irq_name, q0->irq_name) || !interval) {
 323                                         p = st_ic[curr] + (cpu - 1) * ic_nr + j;
 324                                         q = st_ic[prev] + (cpu - 1) * ic_nr + offset;
 325                                         cprintf_f(1, colwidth[j], 2,
 326                                                   S_VALUE(q->interrupt, p->interrupt, itv));
 327                                 }
 328                                 else
 329                                         printf("        N/A");
 330                         }
 331                 }
 332                 printf("\n");
 333         }
 334 }
 335
 336 /*
 337  ***************************************************************************
 338  * Core function used to display statistics.
 339  *
 340  * IN:
 341  * @prev        Position in array where statistics used as reference are.
 342  *              Stats used as reference may be the previous ones read, or
 343  *              the very first ones when calculating the average.
 344  * @curr        Position in array where statistics for current sample are.
 345  * @dis         TRUE if a header line must be printed.
 346  * @prev_string String displayed at the beginning of a header line. This is
 347  *              the timestamp of the previous sample, or "Average" when
 348  *              displaying average stats.
 349  * @curr_string String displayed at the beginning of current sample stats.
 350  *              This is the timestamp of the current sample, or "Average"
 351  *              when displaying average stats.
 352  ***************************************************************************
 353  */
 354 void write_stats_core(int prev, int curr, int dis,
 355                       char *prev_string, char *curr_string)
 356 {
 357         struct stats_cpu *scc, *scp;
 358         unsigned long long itv, pc_itv, g_itv;
 359         int cpu;
 360
 361         /* Test stdout */
 362         TEST_STDOUT(STDOUT_FILENO);
 363
 364         /* Compute time interval */
 365         g_itv = get_interval(uptime[prev], uptime[curr]);
 366
 367         /* Reduce interval value to one processor */
 368         if (cpu_nr > 1) {
 369                 itv = get_interval(uptime0[prev], uptime0[curr]);
 370         }
 371         else {
 372                 itv = g_itv;
 373         }
 374
 375         /* Print CPU stats */
 376         if (DISPLAY_CPU(actflags)) {
 377                 if (dis) {
 378                         printf("\n%-11s  CPU    %%usr   %%nice    %%sys %%iowait    %%irq   "
 379                                "%%soft  %%steal  %%guest  %%gnice   %%idle\n",
 380                                prev_string);
 381                 }
 382
 383                 /* Check if we want global stats among all proc */
 384                 if (*cpu_bitmap & 1) {
 385
 386                         printf("%-11s", curr_string);
 387                         cprintf_in(IS_STR, " %s", " all", 0);
 388
 389                         cprintf_pc(10, 7, 2,
 390                                    (st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest) <
 391                                    (st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest) ?
 392                                    0.0 :
 393                                    ll_sp_value(st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest,
 394                                                st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest,
 395                                                g_itv),
 396                                    (st_cpu[curr]->cpu_nice - st_cpu[curr]->cpu_guest_nice) <
 397                                    (st_cpu[prev]->cpu_nice - st_cpu[prev]->cpu_guest_nice) ?
 398                                    0.0 :
 399                                    ll_sp_value(st_cpu[prev]->cpu_nice - st_cpu[prev]->cpu_guest_nice,
 400                                                st_cpu[curr]->cpu_nice - st_cpu[curr]->cpu_guest_nice,
 401                                                g_itv),
 402                                    ll_sp_value(st_cpu[prev]->cpu_sys,
 403                                                st_cpu[curr]->cpu_sys,
 404                                                g_itv),
 405                                    ll_sp_value(st_cpu[prev]->cpu_iowait,
 406                                                st_cpu[curr]->cpu_iowait,
 407                                                g_itv),
 408                                    ll_sp_value(st_cpu[prev]->cpu_hardirq,
 409                                                st_cpu[curr]->cpu_hardirq,
 410                                                g_itv),
 411                                    ll_sp_value(st_cpu[prev]->cpu_softirq,
 412                                                st_cpu[curr]->cpu_softirq,
 413                                                g_itv),
 414                                    ll_sp_value(st_cpu[prev]->cpu_steal,
 415                                                st_cpu[curr]->cpu_steal,
 416                                                g_itv),
 417                                    ll_sp_value(st_cpu[prev]->cpu_guest,
 418                                                st_cpu[curr]->cpu_guest,
 419                                                g_itv),
 420                                    ll_sp_value(st_cpu[prev]->cpu_guest_nice,
 421                                                st_cpu[curr]->cpu_guest_nice,
 422                                                g_itv),
 423                                    (st_cpu[curr]->cpu_idle < st_cpu[prev]->cpu_idle) ?
 424                                    0.0 :
 425                                    ll_sp_value(st_cpu[prev]->cpu_idle,
 426                                                st_cpu[curr]->cpu_idle,
 427                                                g_itv));
 428                         printf("\n");
 429                 }
 430
 431                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 432
 433                         scc = st_cpu[curr] + cpu;
 434                         scp = st_cpu[prev] + cpu;
 435
 436                         /* Check if we want stats about this proc */
 437                         if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
 438                                 continue;
 439
 440                         /*
 441                          * If the CPU is offline then it is omited from /proc/stat
 442                          * and the sum of all values is zero.
 443                          * (Remember that guest/guest_nice times are already included in
 444                          * user/nice modes.)
 445                          */
 446                         if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 447                              scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 448                              scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 449
 450                                 if (!DISPLAY_ONLINE_CPU(flags)) {
 451                                         printf("%-11s", curr_string);
 452                                         cprintf_in(IS_INT, " %4d", "", cpu - 1);
 453                                         cprintf_pc(10, 7, 2,
 454                                                    0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 455                                         printf("\n");
 456                                 }
 457                                 continue;
 458                         }
 459
 460                         printf("%-11s", curr_string);
 461                         cprintf_in(IS_INT, " %4d", "", cpu - 1);
 462
 463                         /* Recalculate itv for current proc */
 464                         pc_itv = get_per_cpu_interval(scc, scp);
 465
 466                         if (!pc_itv) {
 467                                 /*
 468                                  * If the CPU is tickless then there is no change in CPU values
 469                                  * but the sum of values is not zero.
 470                                  */
 471                                 cprintf_pc(10, 7, 2,
 472                                            0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0);
 473                                 printf("\n");
 474                         }
 475
 476                         else {
 477                                 cprintf_pc(10, 7, 2,
 478                                            (scc->cpu_user - scc->cpu_guest) < (scp->cpu_user - scp->cpu_guest) ?
 479                                            0.0 :
 480                                            ll_sp_value(scp->cpu_user - scp->cpu_guest,
 481                                                        scc->cpu_user - scc->cpu_guest,
 482                                                        pc_itv),
 483                                            (scc->cpu_nice - scc->cpu_guest_nice) < (scp->cpu_nice - scp->cpu_guest_nice) ?
 484                                            0.0 :
 485                                            ll_sp_value(scp->cpu_nice - scp->cpu_guest_nice,
 486                                                        scc->cpu_nice - scc->cpu_guest_nice,
 487                                                        pc_itv),
 488                                            ll_sp_value(scp->cpu_sys,
 489                                                        scc->cpu_sys,
 490                                                        pc_itv),
 491                                            ll_sp_value(scp->cpu_iowait,
 492                                                        scc->cpu_iowait,
 493                                                        pc_itv),
 494                                            ll_sp_value(scp->cpu_hardirq,
 495                                                        scc->cpu_hardirq,
 496                                                        pc_itv),
 497                                            ll_sp_value(scp->cpu_softirq,
 498                                                        scc->cpu_softirq,
 499                                                        pc_itv),
 500                                            ll_sp_value(scp->cpu_steal,
 501                                                        scc->cpu_steal,
 502                                                        pc_itv),
 503                                            ll_sp_value(scp->cpu_guest,
 504                                                        scc->cpu_guest,
 505                                                        pc_itv),
 506                                            ll_sp_value(scp->cpu_guest_nice,
 507                                                        scc->cpu_guest_nice,
 508                                                        pc_itv),
 509                                            (scc->cpu_idle < scp->cpu_idle) ?
 510                                            0.0 :
 511                                            ll_sp_value(scp->cpu_idle,
 512                                                        scc->cpu_idle,
 513                                                        pc_itv));
 514                                 printf("\n");
 515                         }
 516                 }
 517         }
 518
 519         /* Print total number of interrupts per processor */
 520         if (DISPLAY_IRQ_SUM(actflags)) {
 521                 struct stats_irq *sic, *sip;
 522
 523                 if (dis) {
 524                         printf("\n%-11s  CPU    intr/s\n", prev_string);
 525                 }
 526
 527                 if (*cpu_bitmap & 1) {
 528                         printf("%-11s", curr_string);
 529                         cprintf_in(IS_STR, " %s", " all", 0);
 530                         cprintf_f(1, 9, 2,
 531                                   S_VALUE(st_irq[prev]->irq_nr, st_irq[curr]->irq_nr, itv));
 532                         printf("\n");
 533                 }
 534
 535                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 536
 537                         sic = st_irq[curr] + cpu;
 538                         sip = st_irq[prev] + cpu;
 539
 540                         scc = st_cpu[curr] + cpu;
 541                         scp = st_cpu[prev] + cpu;
 542
 543                         /* Check if we want stats about this proc */
 544                         if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
 545                                 continue;
 546
 547                         if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 548                              scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 549                              scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 550
 551                                 /* This is an offline CPU */
 552
 553                                 if (!DISPLAY_ONLINE_CPU(flags)) {
 554                                         printf("%-11s", curr_string);
 555                                         cprintf_in(IS_INT, " %4d", "", cpu- 1);
 556                                         cprintf_f(1, 9, 2, 0.0);
 557                                         printf("\n");
 558                                 }
 559                                 continue;
 560                         }
 561
 562                         printf("%-11s", curr_string);
 563                         cprintf_in(IS_INT, " %4d", "", cpu- 1);
 564
 565                         /* Recalculate itv for current proc */
 566                         pc_itv = get_per_cpu_interval(scc, scp);
 567
 568                         if (!pc_itv) {
 569                                 /* This is a tickless CPU */
 570                                 cprintf_f(1, 9, 2, 0.0);
 571                                 printf("\n");
 572                         }
 573                         else {
 574                                 cprintf_f(1, 9, 2,
 575                                           S_VALUE(sip->irq_nr, sic->irq_nr, itv));
 576                                 printf("\n");
 577                         }
 578                 }
 579         }
 580
 581         if (DISPLAY_IRQ_CPU(actflags)) {
 582                 write_irqcpu_stats(st_irqcpu, irqcpu_nr, dis, itv, prev, curr,
 583                                    prev_string, curr_string);
 584         }
 585
 586         if (DISPLAY_SOFTIRQS(actflags)) {
 587                 write_irqcpu_stats(st_softirqcpu, softirqcpu_nr, dis, itv, prev, curr,
 588                                    prev_string, curr_string);
 589         }
 590
 591         /* Fix CPU counter values for every offline CPU */
 592         for (cpu = 1; cpu <= cpu_nr; cpu++) {
 593
 594                 scc = st_cpu[curr] + cpu;
 595                 scp = st_cpu[prev] + cpu;
 596
 597                 if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 598                      scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 599                      scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 600                         /*
 601                          * Offline CPU found.
 602                          * Set current struct fields (which have been set to zero)
 603                          * to values from previous iteration. Hence their values won't
 604                          * jump from zero when the CPU comes back online.
 605                          */
 606                         *scc = *scp;
 607                 }
 608         }
 609 }
 610
 611 /*
 612  ***************************************************************************
 613  * Print statistics average.
 614  *
 615  * IN:
 616  * @curr        Position in array where statistics for current sample are.
 617  * @dis         TRUE if a header line must be printed.
 618  ***************************************************************************
 619  */
 620 void write_stats_avg(int curr, int dis)
 621 {
 622         char string[16];
 623
 624         strncpy(string, _("Average:"), 16);
 625         string[15] = '\0';
 626         write_stats_core(2, curr, dis, string, string);
 627 }
 628
 629 /*
 630  ***************************************************************************
 631  * Print statistics.
 632  *
 633  * IN:
 634  * @curr        Position in array where statistics for current sample are.
 635  * @dis         TRUE if a header line must be printed.
 636  ***************************************************************************
 637  */
 638 void write_stats(int curr, int dis)
 639 {
 640         char cur_time[2][16];
 641
 642         /* Get previous timestamp */
 643         strftime(cur_time[!curr], sizeof(cur_time[!curr]), "%X", &(mp_tstamp[!curr]));
 644
 645         /* Get current timestamp */
 646         strftime(cur_time[curr], sizeof(cur_time[curr]), "%X", &(mp_tstamp[curr]));
 647
 648         write_stats_core(!curr, curr, dis, cur_time[!curr], cur_time[curr]);
 649 }
 650
 651 /*
 652  ***************************************************************************
 653  * Read stats from /proc/interrupts or /proc/softirqs.
 654  *
 655  * IN:
 656  * @file        /proc file to read (interrupts or softirqs).
 657  * @ic_nr       Number of interrupts (hard or soft) per CPU.
 658  * @curr        Position in array where current statistics will be saved.
 659  *
 660  * OUT:
 661  * @st_ic       Array for per-CPU statistics.
 662  ***************************************************************************
 663  */
 664 void read_interrupts_stat(char *file, struct stats_irqcpu *st_ic[], int ic_nr, int curr)
 665 {
 666         FILE *fp;
 667         struct stats_irq *st_irq_i;
 668         struct stats_irqcpu *p;
 669         char *line = NULL, *li;
 670         unsigned long irq = 0;
 671         unsigned int cpu;
 672         int cpu_index[cpu_nr], index = 0, len;
 673         char *cp, *next;
 674
 675         for (cpu = 0; cpu < cpu_nr; cpu++) {
 676                 st_irq_i = st_irq[curr] + cpu + 1;
 677                 st_irq_i->irq_nr = 0;
 678         }
 679
 680         if ((fp = fopen(file, "r")) != NULL) {
 681
 682                 SREALLOC(line, char, INTERRUPTS_LINE + 11 * cpu_nr);
 683
 684                 /*
 685                  * Parse header line to see which CPUs are online
 686                  */
 687                 while (fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) {
 688                         next = line;
 689                         while (((cp = strstr(next, "CPU")) != NULL) && (index < cpu_nr)) {
 690                                 cpu = strtol(cp + 3, &next, 10);
 691                                 cpu_index[index++] = cpu;
 692                         }
 693                         if (index)
 694                                 /* Header line found */
 695                                 break;
 696                 }
 697
 698                 while ((fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) &&
 699                        (irq < ic_nr)) {
 700
 701                         /* Skip over "<irq>:" */
 702                         if ((cp = strchr(line, ':')) == NULL)
 703                                 /* Chr ':' not found */
 704                                 continue;
 705                         cp++;
 706
 707                         p = st_ic[curr] + irq;
 708
 709                         li = line;
 710                         while (*li == ' ')
 711                                 li++;
 712
 713                         len = strcspn(li, ":");
 714                         if (len >= MAX_IRQ_LEN) {
 715                                 len = MAX_IRQ_LEN - 1;
 716                         }
 717                         strncpy(p->irq_name, li, len);
 718                         p->irq_name[len] = '\0';
 719
 720                         for (cpu = 0; cpu < index; cpu++) {
 721                                 p = st_ic[curr] + cpu_index[cpu] * ic_nr + irq;
 722                                 st_irq_i = st_irq[curr] + cpu_index[cpu] + 1;
 723                                 /*
 724                                  * No need to set (st_irqcpu + cpu * irqcpu_nr)->irq:
 725                                  * This is the same as st_irqcpu->irq.
 726                                  */
 727                                 p->interrupt = strtoul(cp, &next, 10);
 728                                 st_irq_i->irq_nr += p->interrupt;
 729                                 cp = next;
 730                         }
 731                         irq++;
 732                 }
 733
 734                 fclose(fp);
 735
 736                 free(line);
 737         }
 738
 739         while (irq < ic_nr) {
 740                 /* Nb of interrupts per processor has changed */
 741                 p = st_ic[curr] + irq;
 742                 p->irq_name[0] = '\0';  /* This value means this is a dummy interrupt */
 743                 irq++;
 744         }
 745 }
 746
 747 /*
 748  ***************************************************************************
 749  * Main loop: Read stats from the relevant sources, and display them.
 750  *
 751  * IN:
 752  * @dis_hdr     Set to TRUE if the header line must always be printed.
 753  * @rows        Number of rows of screen.
 754  ***************************************************************************
 755  */
 756 void rw_mpstat_loop(int dis_hdr, int rows)
 757 {
 758         struct stats_cpu *scc;
 759         int cpu;
 760         int curr = 1, dis = 1;
 761         unsigned long lines = rows;
 762
 763         /* Dont buffer data if redirected to a pipe */
 764         setbuf(stdout, NULL);
 765
 766         /* Read stats */
 767         if (cpu_nr > 1) {
 768                 /*
 769                  * Init uptime0. So if /proc/uptime cannot fill it,
 770                  * this will be done by /proc/stat.
 771                  */
 772                 uptime0[0] = 0;
 773                 read_uptime(&(uptime0[0]));
 774         }
 775         read_stat_cpu(st_cpu[0], cpu_nr + 1, &(uptime[0]), &(uptime0[0]));
 776
 777         if (DISPLAY_IRQ_SUM(actflags)) {
 778                 read_stat_irq(st_irq[0], 1);
 779         }
 780
 781         if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
 782                 /* Read this file to display int per CPU or total nr of int per CPU */
 783                 read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, 0);
 784         }
 785
 786         if (DISPLAY_SOFTIRQS(actflags)) {
 787                 read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, 0);
 788         }
 789
 790         if (!interval) {
 791                 /* Display since boot time */
 792                 mp_tstamp[1] = mp_tstamp[0];
 793                 memset(st_cpu[1], 0, STATS_CPU_SIZE * (cpu_nr + 1));
 794                 memset(st_irq[1], 0, STATS_IRQ_SIZE * (cpu_nr + 1));
 795                 memset(st_irqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
 796                 if (DISPLAY_SOFTIRQS(actflags)) {
 797                         memset(st_softirqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
 798                 }
 799                 write_stats(0, DISP_HDR);
 800                 exit(0);
 801         }
 802
 803         /* Set a handler for SIGALRM */
 804         memset(&alrm_act, 0, sizeof(alrm_act));
 805         alrm_act.sa_handler = alarm_handler;
 806         sigaction(SIGALRM, &alrm_act, NULL);
 807         alarm(interval);
 808
 809         /* Save the first stats collected. Will be used to compute the average */
 810         mp_tstamp[2] = mp_tstamp[0];
 811         uptime[2] = uptime[0];
 812         uptime0[2] = uptime0[0];
 813         memcpy(st_cpu[2], st_cpu[0], STATS_CPU_SIZE * (cpu_nr + 1));
 814         memcpy(st_irq[2], st_irq[0], STATS_IRQ_SIZE * (cpu_nr + 1));
 815         memcpy(st_irqcpu[2], st_irqcpu[0], STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
 816         if (DISPLAY_SOFTIRQS(actflags)) {
 817                 memcpy(st_softirqcpu[2], st_softirqcpu[0],
 818                        STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
 819         }
 820
 821         /* Set a handler for SIGINT */
 822         memset(&int_act, 0, sizeof(int_act));
 823         int_act.sa_handler = int_handler;
 824         sigaction(SIGINT, &int_act, NULL);
 825
 826         pause();
 827
 828         if (sigint_caught)
 829                 /* SIGINT signal caught during first interval: Exit immediately */
 830                 return;
 831
 832         do {
 833                 /*
 834                  * Resetting the structure not needed since every fields will be set.
 835                  * Exceptions are per-CPU structures: Some of them may not be filled
 836                  * if corresponding processor is disabled (offline). We set them to zero
 837                  * to be able to distinguish between offline and tickless CPUs.
 838                  */
 839                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 840                         scc = st_cpu[curr] + cpu;
 841                         memset(scc, 0, STATS_CPU_SIZE);
 842                 }
 843
 844                 /* Get time */
 845                 get_localtime(&(mp_tstamp[curr]), 0);
 846
 847                 /* Read stats */
 848                 if (cpu_nr > 1) {
 849                         uptime0[curr] = 0;
 850                         read_uptime(&(uptime0[curr]));
 851                 }
 852                 read_stat_cpu(st_cpu[curr], cpu_nr + 1, &(uptime[curr]), &(uptime0[curr]));
 853
 854                 if (DISPLAY_IRQ_SUM(actflags)) {
 855                         read_stat_irq(st_irq[curr], 1);
 856                 }
 857
 858                 if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
 859                         read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, curr);
 860                 }
 861
 862                 if (DISPLAY_SOFTIRQS(actflags)) {
 863                         read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, curr);
 864                 }
 865
 866                 /* Write stats */
 867                 if (!dis_hdr) {
 868                         dis = lines / rows;
 869                         if (dis) {
 870                                 lines %= rows;
 871                         }
 872                         lines++;
 873                 }
 874                 write_stats(curr, dis);
 875
 876                 if (count > 0) {
 877                         count--;
 878                 }
 879
 880                 if (count) {
 881
 882                         pause();
 883
 884                         if (sigint_caught) {
 885                                 /* SIGINT signal caught => Display average stats */
 886                                 count = 0;
 887                                 printf("\n");   /* Skip "^C" displayed on screen */
 888                         }
 889                         else {
 890                                 curr ^= 1;
 891                         }
 892                 }
 893         }
 894         while (count);
 895
 896         /* Write stats average */
 897         write_stats_avg(curr, dis_hdr);
 898 }
 899
 900 /*
 901  ***************************************************************************
 902  * Main entry to the program
 903  ***************************************************************************
 904  */
 905 int main(int argc, char **argv)
 906 {
 907         int opt = 0, i, actset = FALSE;
 908         struct utsname header;
 909         int dis_hdr = -1;
 910         int rows = 23;
 911         char *t;
 912
 913 #ifdef USE_NLS
 914         /* Init National Language Support */
 915         init_nls();
 916 #endif
 917
 918         /* Init color strings */
 919         init_colors();
 920
 921         /* Get HZ */
 922         get_HZ();
 923
 924         /* What is the highest processor number on this machine? */
 925         cpu_nr = get_cpu_nr(~0, TRUE);
 926
 927         /* Calculate number of interrupts per processor */
 928         irqcpu_nr = get_irqcpu_nr(INTERRUPTS, NR_IRQS, cpu_nr) +
 929                     NR_IRQCPU_PREALLOC;
 930         /* Calculate number of soft interrupts per processor */
 931         softirqcpu_nr = get_irqcpu_nr(SOFTIRQS, NR_IRQS, cpu_nr) +
 932                         NR_IRQCPU_PREALLOC;
 933
 934         /*
 935          * cpu_nr: a value of 2 means there are 2 processors (0 and 1).
 936          * In this case, we have to allocate 3 structures: global, proc0 and proc1.
 937          */
 938         salloc_mp_struct(cpu_nr + 1);
 939
 940         while (++opt < argc) {
 941
 942                 if (!strcmp(argv[opt], "-I")) {
 943                         if (argv[++opt]) {
 944                                 actset = TRUE;
 945                                 if (!strcmp(argv[opt], K_SUM)) {
 946                                         /* Display total number of interrupts per CPU */
 947                                         actflags |= M_D_IRQ_SUM;
 948                                 }
 949                                 else if (!strcmp(argv[opt], K_CPU)) {
 950                                         /* Display interrupts per CPU */
 951                                         actflags |= M_D_IRQ_CPU;
 952                                 }
 953                                 else if (!strcmp(argv[opt], K_SCPU)) {
 954                                         /* Display soft interrupts per CPU */
 955                                         actflags |= M_D_SOFTIRQS;
 956                                 }
 957                                 else if (!strcmp(argv[opt], K_ALL)) {
 958                                         actflags |= M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
 959                                 }
 960                                 else {
 961                                         usage(argv[0]);
 962                                 }
 963                         }
 964                         else {
 965                                 usage(argv[0]);
 966                         }
 967                 }
 968
 969                 else if (!strcmp(argv[opt], "-P")) {
 970                         /* '-P ALL' can be used on UP machines */
 971                         if (argv[++opt]) {
 972                                 flags |= F_P_OPTION;
 973                                 dis_hdr++;
 974
 975                                 for (t = strtok(argv[opt], ","); t; t = strtok(NULL, ",")) {
 976                                         if (!strcmp(t, K_ALL) || !strcmp(t, K_ON)) {
 977                                                 if (cpu_nr) {
 978                                                         dis_hdr = 9;
 979                                                 }
 980                                                 /*
 981                                                  * Set bit for every processor.
 982                                                  * Also indicate to display stats for CPU 'all'.
 983                                                  */
 984                                                 memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
 985                                                 if (!strcmp(t, K_ON)) {
 986                                                         /* Display stats only for online CPU */
 987                                                         flags |= F_P_ON;
 988                                                 }
 989                                         }
 990                                         else {
 991                                                 if (strspn(t, DIGITS) != strlen(t)) {
 992                                                         usage(argv[0]);
 993                                                 }
 994                                                 i = atoi(t);    /* Get cpu number */
 995                                                 if (i >= cpu_nr) {
 996                                                         fprintf(stderr, _("Not that many processors!\n"));
 997                                                         exit(1);
 998                                                 }
 999                                                 i++;
1000                                                 *(cpu_bitmap + (i >> 3)) |= 1 << (i & 0x07);
1001                                         }
1002                                 }
1003                         }
1004                         else {
1005                                 usage(argv[0]);
1006                         }
1007                 }
1008
1009                 else if (!strncmp(argv[opt], "-", 1)) {
1010                         for (i = 1; *(argv[opt] + i); i++) {
1011
1012                                 switch (*(argv[opt] + i)) {
1013
1014                                 case 'A':
1015                                         actflags |= M_D_CPU + M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
1016                                         actset = TRUE;
1017                                         /* Select all processors */
1018                                         flags |= F_P_OPTION;
1019                                         memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
1020                                         break;
1021
1022                                 case 'u':
1023                                         /* Display CPU */
1024                                         actflags |= M_D_CPU;
1025                                         break;
1026
1027                                 case 'V':
1028                                         /* Print version number */
1029                                         print_version();
1030                                         break;
1031
1032                                 default:
1033                                         usage(argv[0]);
1034                                 }
1035                         }
1036                 }
1037
1038                 else if (interval < 0) {
1039                         /* Get interval */
1040                         if (strspn(argv[opt], DIGITS) != strlen(argv[opt])) {
1041                                 usage(argv[0]);
1042                         }
1043                         interval = atol(argv[opt]);
1044                         if (interval < 0) {
1045                                 usage(argv[0]);
1046                         }
1047                         count = -1;
1048                 }
1049
1050                 else if (count <= 0) {
1051                         /* Get count value */
1052                         if ((strspn(argv[opt], DIGITS) != strlen(argv[opt])) ||
1053                             !interval) {
1054                                 usage(argv[0]);
1055                         }
1056                         count = atol(argv[opt]);
1057                         if (count < 1) {
1058                                 usage(argv[0]);
1059                         }
1060                 }
1061
1062                 else {
1063                         usage(argv[0]);
1064                 }
1065         }
1066
1067         /* Default: Display CPU */
1068         if (!actset) {
1069                 actflags |= M_D_CPU;
1070         }
1071
1072         if (count_bits(&actflags, sizeof(unsigned int)) > 1) {
1073                 dis_hdr = 9;
1074         }
1075
1076         if (!USE_P_OPTION(flags)) {
1077                 /* Option -P not used: Set bit 0 (global stats among all proc) */
1078                 *cpu_bitmap = 1;
1079         }
1080         if (dis_hdr < 0) {
1081                 dis_hdr = 0;
1082         }
1083         if (!dis_hdr) {
1084                 /* Get window size */
1085                 rows = get_win_height();
1086         }
1087         if (interval < 0) {
1088                 /* Interval not set => display stats since boot time */
1089                 interval = 0;
1090         }
1091
1092         /* Get time */
1093         get_localtime(&(mp_tstamp[0]), 0);
1094
1095         /* Get system name, release number and hostname */
1096         uname(&header);
1097         print_gal_header(&(mp_tstamp[0]), header.sysname, header.release,
1098                          header.nodename, header.machine, get_cpu_nr(~0, FALSE));
1099
1100         /* Main loop */
1101         rw_mpstat_loop(dis_hdr, rows);
1102
1103         /* Free structures */
1104         sfree_mp_struct();
1105
1106         return 0;
1107 }