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

   1 /*
   2  * mpstat: per-processor statistics
   3  * (C) 2000-2011 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
  36 #ifdef USE_NLS
  37 #include <locale.h>
  38 #include <libintl.h>
  39 #define _(string) gettext(string)
  40 #else
  41 #define _(string) (string)
  42 #endif
  43
  44 #define SCCSID "@(#)sysstat-" VERSION ": "  __FILE__ " compiled " __DATE__ " " __TIME__
  45 char *sccsid(void) { return (SCCSID); }
  46
  47 unsigned long long uptime[3] = {0, 0, 0};
  48 unsigned long long uptime0[3] = {0, 0, 0};
  49
  50 /* NOTE: Use array of _char_ for bitmaps to avoid endianness problems...*/
  51 unsigned char *cpu_bitmap;      /* Bit 0: Global; Bit 1: 1st proc; etc. */
  52
  53 /* Structures used to store stats */
  54 struct stats_cpu *st_cpu[3];
  55 struct stats_irq *st_irq[3];
  56 struct stats_irqcpu *st_irqcpu[3];
  57 struct stats_irqcpu *st_softirqcpu[3];
  58
  59 struct tm mp_tstamp[3];
  60
  61 /* Activity flag */
  62 unsigned int actflags = 0;
  63
  64 unsigned int flags = 0;
  65
  66 /* Interval and count parameters */
  67 long interval = -1, count = 0;
  68
  69 /* Nb of processors on the machine */
  70 int cpu_nr = 0;
  71 /* Nb of interrupts per processor */
  72 int irqcpu_nr = 0;
  73 /* Nb of soft interrupts per processor */
  74 int softirqcpu_nr = 0;
  75
  76 /*
  77  ***************************************************************************
  78  * Print usage and exit
  79  *
  80  * IN:
  81  * @progname    Name of sysstat command
  82  ***************************************************************************
  83  */
  84 void usage(char *progname)
  85 {
  86         fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ]\n"),
  87                 progname);
  88
  89         fprintf(stderr, _("Options are:\n"
  90                           "[ -A ] [ -I { SUM | CPU | SCPU | ALL } ] [ -u ]\n"
  91                           "[ -P { <cpu> [,...] | ON | ALL } ] [ -V ]\n"));
  92         exit(1);
  93 }
  94
  95 /*
  96  ***************************************************************************
  97  * SIGALRM signal handler
  98  *
  99  * IN:
 100  * @sig Signal number. Set to 0 for the first time, then to SIGALRM.
 101  ***************************************************************************
 102  */
 103 void alarm_handler(int sig)
 104 {
 105         signal(SIGALRM, alarm_handler);
 106         alarm(interval);
 107 }
 108
 109 /*
 110  ***************************************************************************
 111  * Allocate stats structures and cpu bitmap.
 112  *
 113  * IN:
 114  * @nr_cpus     Number of CPUs. This is the real number of available CPUs + 1
 115  *              because we also have to allocate a structure for CPU 'all'.
 116  ***************************************************************************
 117  */
 118 void salloc_mp_struct(int nr_cpus)
 119 {
 120         int i;
 121
 122         for (i = 0; i < 3; i++) {
 123
 124                 if ((st_cpu[i] = (struct stats_cpu *) malloc(STATS_CPU_SIZE * nr_cpus))
 125                     == NULL) {
 126                         perror("malloc");
 127                         exit(4);
 128                 }
 129                 memset(st_cpu[i], 0, STATS_CPU_SIZE * nr_cpus);
 130
 131                 if ((st_irq[i] = (struct stats_irq *) malloc(STATS_IRQ_SIZE * nr_cpus))
 132                     == NULL) {
 133                         perror("malloc");
 134                         exit(4);
 135                 }
 136                 memset(st_irq[i], 0, STATS_IRQ_SIZE * nr_cpus);
 137
 138                 if ((st_irqcpu[i] = (struct stats_irqcpu *) malloc(STATS_IRQCPU_SIZE * nr_cpus * irqcpu_nr))
 139                     == NULL) {
 140                         perror("malloc");
 141                         exit(4);
 142                 }
 143                 memset(st_irqcpu[i], 0, STATS_IRQCPU_SIZE * nr_cpus * irqcpu_nr);
 144
 145                 if ((st_softirqcpu[i] = (struct stats_irqcpu *) malloc(STATS_IRQCPU_SIZE * nr_cpus * softirqcpu_nr))
 146                      == NULL) {
 147                         perror("malloc");
 148                         exit(4);
 149                 }
 150                 memset(st_softirqcpu[i], 0, STATS_IRQCPU_SIZE * nr_cpus * softirqcpu_nr);
 151         }
 152
 153         if ((cpu_bitmap = (unsigned char *) malloc((nr_cpus >> 3) + 1)) == NULL) {
 154                 perror("malloc");
 155                 exit(4);
 156         }
 157         memset(cpu_bitmap, 0, (nr_cpus >> 3) + 1);
 158 }
 159
 160 /*
 161  ***************************************************************************
 162  * Free structures and bitmap.
 163  ***************************************************************************
 164  */
 165 void sfree_mp_struct(void)
 166 {
 167         int i;
 168
 169         for (i = 0; i < 3; i++) {
 170
 171                 if (st_cpu[i]) {
 172                         free(st_cpu[i]);
 173                 }
 174                 if (st_irq[i]) {
 175                         free(st_irq[i]);
 176                 }
 177                 if (st_irqcpu[i]) {
 178                         free(st_irqcpu[i]);
 179                 }
 180                 if (st_softirqcpu[i]) {
 181                         free(st_softirqcpu[i]);
 182                 }
 183         }
 184
 185         if (cpu_bitmap) {
 186                 free(cpu_bitmap);
 187         }
 188 }
 189
 190 /*
 191  ***************************************************************************
 192  * Display per CPU statistics.
 193  *
 194  * IN:
 195  * @st_ic       Array for per-CPU statistics.
 196  * @ic_nr       Number of interrupts (hard or soft) per CPU.
 197  * @dis         TRUE if a header line must be printed.
 198  * @itv         Interval value.
 199  * @prev        Position in array where statistics used as reference are.
 200  *              Stats used as reference may be the previous ones read, or
 201  *              the very first ones when calculating the average.
 202  * @curr        Position in array where current statistics will be saved.
 203  * @prev_string String displayed at the beginning of a header line. This is
 204  *              the timestamp of the previous sample, or "Average" when
 205  *              displaying average stats.
 206  * @curr_string String displayed at the beginning of current sample stats.
 207  *              This is the timestamp of the current sample, or "Average"
 208  *              when displaying average stats.
 209  ***************************************************************************
 210  */
 211 void write_irqcpu_stats(struct stats_irqcpu *st_ic[], int ic_nr, int dis,
 212                         unsigned long long itv, int prev, int curr,
 213                         char *prev_string, char *curr_string)
 214 {
 215         struct stats_cpu *scc, *scp;
 216         int j = 0, offset, cpu;
 217         struct stats_irqcpu *p, *q, *p0, *q0;
 218
 219         /*
 220         * Check if number of interrupts has changed.
 221         * NB: A null interval value indicates that we are
 222          * displaying statistics since system startup.
 223          */
 224         if (!dis && interval) {
 225                 do {
 226                         p0 = st_ic[curr] + j;
 227                         if (p0->irq_name[0] != '\0') {
 228                                 q0 = st_ic[prev] + j;
 229                                 if (strcmp(p0->irq_name, q0->irq_name)) {
 230                                         /* These are two different irq */
 231                                         j = -2;
 232                                 }
 233                         }
 234                         j++;
 235                 }
 236                 while ((j > 0) && (j <= ic_nr));
 237         }
 238
 239         if (dis || (j < 0)) {
 240                 /* Print header */
 241                 printf("\n%-11s  CPU", prev_string);
 242                 for (j = 0; j < ic_nr; j++) {
 243                         p0 = st_ic[curr] + j;
 244                         if (p0->irq_name[0] != '\0') {  /* Nb of irq per proc may have varied... */
 245                                 printf(" %8s/s", p0->irq_name);
 246                         }
 247                 }
 248                 printf("\n");
 249         }
 250
 251         for (cpu = 1; cpu <= cpu_nr; cpu++) {
 252
 253                 scc = st_cpu[curr] + cpu;
 254                 scp = st_cpu[prev] + cpu;
 255
 256                 /*
 257                  * Check if we want stats about this CPU.
 258                  * CPU must have been explicitly selected using option -P,
 259                  * else we display every CPU.
 260                  */
 261                 if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))) && USE_P_OPTION(flags))
 262                         continue;
 263
 264                 if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 265                      scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 266                      scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 267
 268                         /* Offline CPU found */
 269
 270                         if (DISPLAY_ONLINE_CPU(flags))
 271                                 continue;
 272                 }
 273
 274                 printf("%-11s  %3d", curr_string, cpu - 1);
 275
 276                 for (j = 0; j < ic_nr; j++) {
 277                         p0 = st_ic[curr] + j;   /* irq field set only for proc #0 */
 278                         /*
 279                          * An empty string for irq name means it is a remaining interrupt
 280                          * which is no longer used, for example because the
 281                          * number of interrupts has decreased in /proc/interrupts.
 282                          */
 283                         if (p0->irq_name[0] != '\0') {
 284                                 q0 = st_ic[prev] + j;
 285                                 offset = j;
 286
 287                                 /*
 288                                  * If we want stats for the time since system startup,
 289                                  * we have p0->irq != q0->irq, since q0 structure is
 290                                  * completely set to zero.
 291                                  */
 292                                 if (strcmp(p0->irq_name, q0->irq_name) && interval) {
 293                                         if (j)
 294                                                 offset = j - 1;
 295                                         q0 = st_ic[prev] + offset;
 296                                         if (strcmp(p0->irq_name, q0->irq_name) && (j + 1 < ic_nr))
 297                                                 offset = j + 1;
 298                                         q0 = st_ic[prev] + offset;
 299                                 }
 300
 301                                 if (!strcmp(p0->irq_name, q0->irq_name) || !interval) {
 302                                         p = st_ic[curr] + (cpu - 1) * ic_nr + j;
 303                                         q = st_ic[prev] + (cpu - 1) * ic_nr + offset;
 304                                         printf(" %10.2f",
 305                                                S_VALUE(q->interrupt, p->interrupt, itv));
 306                                 }
 307                                 else
 308                                         printf("        N/A");
 309                         }
 310                 }
 311                 printf("\n");
 312         }
 313 }
 314
 315 /*
 316  ***************************************************************************
 317  * Core function used to display statistics.
 318  *
 319  * IN:
 320  * @prev        Position in array where statistics used as reference are.
 321  *              Stats used as reference may be the previous ones read, or
 322  *              the very first ones when calculating the average.
 323  * @curr        Position in array where statistics for current sample are.
 324  * @dis         TRUE if a header line must be printed.
 325  * @prev_string String displayed at the beginning of a header line. This is
 326  *              the timestamp of the previous sample, or "Average" when
 327  *              displaying average stats.
 328  * @curr_string String displayed at the beginning of current sample stats.
 329  *              This is the timestamp of the current sample, or "Average"
 330  *              when displaying average stats.
 331  ***************************************************************************
 332  */
 333 void write_stats_core(int prev, int curr, int dis,
 334                       char *prev_string, char *curr_string)
 335 {
 336         struct stats_cpu *scc, *scp;
 337         unsigned long long itv, pc_itv, g_itv;
 338         int cpu;
 339
 340         /* Test stdout */
 341         TEST_STDOUT(STDOUT_FILENO);
 342
 343         /* Compute time interval */
 344         g_itv = get_interval(uptime[prev], uptime[curr]);
 345
 346         /* Reduce interval value to one processor */
 347         if (cpu_nr > 1) {
 348                 itv = get_interval(uptime0[prev], uptime0[curr]);
 349         }
 350         else {
 351                 itv = g_itv;
 352         }
 353
 354         /* Print CPU stats */
 355         if (DISPLAY_CPU(actflags)) {
 356                 if (dis) {
 357                         printf("\n%-11s  CPU    %%usr   %%nice    %%sys %%iowait    %%irq   "
 358                                "%%soft  %%steal  %%guest   %%idle\n",
 359                                prev_string);
 360                 }
 361
 362                 /* Check if we want global stats among all proc */
 363                 if (*cpu_bitmap & 1) {
 364
 365                         printf("%-11s  all", curr_string);
 366
 367                         printf("  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f\n",
 368                                (st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest) <
 369                                (st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest) ?
 370                                0.0 :
 371                                ll_sp_value(st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest,
 372                                            st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest,
 373                                            g_itv),
 374                                ll_sp_value(st_cpu[prev]->cpu_nice,
 375                                            st_cpu[curr]->cpu_nice,
 376                                            g_itv),
 377                                ll_sp_value(st_cpu[prev]->cpu_sys,
 378                                            st_cpu[curr]->cpu_sys,
 379                                            g_itv),
 380                                ll_sp_value(st_cpu[prev]->cpu_iowait,
 381                                            st_cpu[curr]->cpu_iowait,
 382                                            g_itv),
 383                                ll_sp_value(st_cpu[prev]->cpu_hardirq,
 384                                            st_cpu[curr]->cpu_hardirq,
 385                                            g_itv),
 386                                ll_sp_value(st_cpu[prev]->cpu_softirq,
 387                                            st_cpu[curr]->cpu_softirq,
 388                                            g_itv),
 389                                ll_sp_value(st_cpu[prev]->cpu_steal,
 390                                            st_cpu[curr]->cpu_steal,
 391                                            g_itv),
 392                                ll_sp_value(st_cpu[prev]->cpu_guest,
 393                                            st_cpu[curr]->cpu_guest,
 394                                            g_itv),
 395                                (st_cpu[curr]->cpu_idle < st_cpu[prev]->cpu_idle) ?
 396                                0.0 :
 397                                ll_sp_value(st_cpu[prev]->cpu_idle,
 398                                            st_cpu[curr]->cpu_idle,
 399                                            g_itv));
 400                 }
 401
 402                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 403
 404                         scc = st_cpu[curr] + cpu;
 405                         scp = st_cpu[prev] + cpu;
 406
 407                         /* Check if we want stats about this proc */
 408                         if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
 409                                 continue;
 410
 411                         /*
 412                          * If the CPU is offline then it is omited from /proc/stat
 413                          * and the sum of all values is zero.
 414                          * (Remember that guest time is already included in user mode.)
 415                          */
 416                         if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 417                              scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 418                              scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 419
 420                                 if (!DISPLAY_ONLINE_CPU(flags)) {
 421                                         printf("%-11s %4d"
 422                                                "  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f"
 423                                                "  %6.2f  %6.2f  %6.2f\n",
 424                                                curr_string, cpu - 1,
 425                                                0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 426                                 }
 427                                 continue;
 428                         }
 429
 430                         printf("%-11s %4d", curr_string, cpu - 1);
 431
 432                         /* Recalculate itv for current proc */
 433                         pc_itv = get_per_cpu_interval(scc, scp);
 434
 435                         if (!pc_itv) {
 436                                 /*
 437                                  * If the CPU is tickless then there is no change in CPU values
 438                                  * but the sum of values is not zero.
 439                                  */
 440                                 printf("  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f"
 441                                        "  %6.2f  %6.2f  %6.2f\n",
 442                                        0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0);
 443                         }
 444
 445                         else {
 446                                 printf("  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f"
 447                                        "  %6.2f  %6.2f  %6.2f\n",
 448                                        (scc->cpu_user - scc->cpu_guest) < (scp->cpu_user - scp->cpu_guest) ?
 449                                        0.0 :
 450                                        ll_sp_value(scp->cpu_user - scp->cpu_guest,
 451                                                    scc->cpu_user - scc->cpu_guest,
 452                                                    pc_itv),
 453                                        ll_sp_value(scp->cpu_nice,
 454                                                    scc->cpu_nice,
 455                                                    pc_itv),
 456                                        ll_sp_value(scp->cpu_sys,
 457                                                    scc->cpu_sys,
 458                                                    pc_itv),
 459                                        ll_sp_value(scp->cpu_iowait,
 460                                                    scc->cpu_iowait,
 461                                                    pc_itv),
 462                                        ll_sp_value(scp->cpu_hardirq,
 463                                                    scc->cpu_hardirq,
 464                                                    pc_itv),
 465                                        ll_sp_value(scp->cpu_softirq,
 466                                                    scc->cpu_softirq,
 467                                                    pc_itv),
 468                                        ll_sp_value(scp->cpu_steal,
 469                                                    scc->cpu_steal,
 470                                                    pc_itv),
 471                                        ll_sp_value(scp->cpu_guest,
 472                                                    scc->cpu_guest,
 473                                                    pc_itv),
 474                                        (scc->cpu_idle < scp->cpu_idle) ?
 475                                        0.0 :
 476                                        ll_sp_value(scp->cpu_idle,
 477                                                    scc->cpu_idle,
 478                                                    pc_itv));
 479                         }
 480                 }
 481         }
 482
 483         /* Print total number of interrupts per processor */
 484         if (DISPLAY_IRQ_SUM(actflags)) {
 485                 struct stats_irq *sic, *sip;
 486
 487                 if (dis) {
 488                         printf("\n%-11s  CPU    intr/s\n", prev_string);
 489                 }
 490
 491                 if (*cpu_bitmap & 1) {
 492                         printf("%-11s  all %9.2f\n", curr_string,
 493                                ll_s_value(st_irq[prev]->irq_nr, st_irq[curr]->irq_nr, itv));
 494                 }
 495
 496                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 497
 498                         sic = st_irq[curr] + cpu;
 499                         sip = st_irq[prev] + cpu;
 500
 501                         scc = st_cpu[curr] + cpu;
 502                         scp = st_cpu[prev] + cpu;
 503
 504                         /* Check if we want stats about this proc */
 505                         if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
 506                                 continue;
 507
 508                         if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 509                              scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 510                              scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 511
 512                                 /* This is an offline CPU */
 513
 514                                 if (!DISPLAY_ONLINE_CPU(flags)) {
 515                                         printf("%-11s %4d"
 516                                                "  %9.2f\n",
 517                                                curr_string, cpu - 1,
 518                                                0.0);
 519                                 }
 520                                 continue;
 521                         }
 522
 523                         printf("%-11s %4d", curr_string, cpu - 1);
 524
 525                         /* Recalculate itv for current proc */
 526                         pc_itv = get_per_cpu_interval(scc, scp);
 527
 528                         if (!pc_itv) {
 529                                 /* This is a tickless CPU */
 530                                 printf(" %9.2f\n", 0.0);
 531                         }
 532                         else {
 533                                 printf(" %9.2f\n",
 534                                        ll_s_value(sip->irq_nr, sic->irq_nr, itv));
 535                         }
 536                 }
 537         }
 538
 539         if (DISPLAY_IRQ_CPU(actflags)) {
 540                 write_irqcpu_stats(st_irqcpu, irqcpu_nr, dis, itv, prev, curr,
 541                                    prev_string, curr_string);
 542         }
 543
 544         if (DISPLAY_SOFTIRQS(actflags)) {
 545                 write_irqcpu_stats(st_softirqcpu, softirqcpu_nr, dis, itv, prev, curr,
 546                                    prev_string, curr_string);
 547         }
 548
 549         /* Fix CPU counter values for every offline CPU */
 550         for (cpu = 1; cpu <= cpu_nr; cpu++) {
 551
 552                 scc = st_cpu[curr] + cpu;
 553                 scp = st_cpu[prev] + cpu;
 554
 555                 if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 556                      scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 557                      scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 558                         /*
 559                          * Offline CPU found.
 560                          * Set current struct fields (which have been set to zero)
 561                          * to values from previous iteration. Hence their values won't
 562                          * jump from zero when the CPU comes back online.
 563                          */
 564                         *scc = *scp;
 565                 }
 566         }
 567 }
 568
 569 /*
 570  ***************************************************************************
 571  * Print statistics average.
 572  *
 573  * IN:
 574  * @curr        Position in array where statistics for current sample are.
 575  * @dis         TRUE if a header line must be printed.
 576  ***************************************************************************
 577  */
 578 void write_stats_avg(int curr, int dis)
 579 {
 580         char string[16];
 581
 582         strncpy(string, _("Average:"), 16);
 583         string[15] = '\0';
 584         write_stats_core(2, curr, dis, string, string);
 585 }
 586
 587 /*
 588  ***************************************************************************
 589  * Print statistics.
 590  *
 591  * IN:
 592  * @curr        Position in array where statistics for current sample are.
 593  * @dis         TRUE if a header line must be printed.
 594  ***************************************************************************
 595  */
 596 void write_stats(int curr, int dis)
 597 {
 598         char cur_time[2][16];
 599
 600         /* Get previous timestamp */
 601         strftime(cur_time[!curr], 16, "%X", &(mp_tstamp[!curr]));
 602
 603         /* Get current timestamp */
 604         strftime(cur_time[curr], 16, "%X", &(mp_tstamp[curr]));
 605
 606         write_stats_core(!curr, curr, dis, cur_time[!curr], cur_time[curr]);
 607 }
 608
 609 /*
 610  ***************************************************************************
 611  * Read stats from /proc/interrupts or /proc/softirqs.
 612  *
 613  * IN:
 614  * @file        /proc file to read (interrupts or softirqs).
 615  * @ic_nr       Number of interrupts (hard or soft) per CPU.
 616  * @curr        Position in array where current statistics will be saved.
 617  *
 618  * OUT:
 619  * @st_ic       Array for per-CPU statistics.
 620  ***************************************************************************
 621  */
 622 void read_interrupts_stat(char *file, struct stats_irqcpu *st_ic[], int ic_nr, int curr)
 623 {
 624         FILE *fp;
 625         struct stats_irq *st_irq_i;
 626         struct stats_irqcpu *p;
 627         char *line = NULL;
 628         unsigned long irq = 0;
 629         unsigned int cpu;
 630         int cpu_index[cpu_nr], index = 0, dgt, len;
 631         char *cp, *next;
 632
 633         for (cpu = 0; cpu < cpu_nr; cpu++) {
 634                 st_irq_i = st_irq[curr] + cpu + 1;
 635                 st_irq_i->irq_nr = 0;
 636         }
 637
 638         if ((fp = fopen(file, "r")) != NULL) {
 639
 640                 SREALLOC(line, char, INTERRUPTS_LINE + 11 * cpu_nr);
 641
 642                 /*
 643                  * Parse header line to see which CPUs are online
 644                  */
 645                 while (fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) {
 646                         next = line;
 647                         while (((cp = strstr(next, "CPU")) != NULL) && (index < cpu_nr)) {
 648                                 cpu = strtol(cp + 3, &next, 10);
 649                                 cpu_index[index++] = cpu;
 650                         }
 651                         if (index)
 652                                 /* Header line found */
 653                                 break;
 654                 }
 655
 656                 while ((fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) &&
 657                        (irq < ic_nr)) {
 658
 659                         /* Skip over "<irq>:" */
 660                         if ((cp = strchr(line, ':')) == NULL)
 661                                 continue;
 662                         cp++;
 663
 664                         p = st_ic[curr] + irq;
 665                         len = strcspn(line, ":");
 666                         if (len >= MAX_IRQ_LEN) {
 667                                 len = MAX_IRQ_LEN - 1;
 668                         }
 669                         strncpy(p->irq_name, line, len);
 670                         p->irq_name[len] = '\0';
 671                         dgt = isdigit(line[len - 1]);
 672
 673                         for (cpu = 0; cpu < index; cpu++) {
 674                                 p = st_ic[curr] + cpu_index[cpu] * ic_nr + irq;
 675                                 st_irq_i = st_irq[curr] + cpu_index[cpu] + 1;
 676                                 /*
 677                                  * No need to set (st_irqcpu + cpu * irqcpu_nr)->irq:
 678                                  * This is the same as st_irqcpu->irq.
 679                                  */
 680                                 p->interrupt = strtoul(cp, &next, 10);
 681                                 if (dgt) {
 682                                         /* Sum only numerical irq (and not NMI, LOC, etc.) */
 683                                         st_irq_i->irq_nr += p->interrupt;
 684                                 }
 685                                 cp = next;
 686                         }
 687                         irq++;
 688                 }
 689
 690                 fclose(fp);
 691
 692                 if (line) {
 693                         free(line);
 694                 }
 695         }
 696
 697         while (irq < ic_nr) {
 698                 /* Nb of interrupts per processor has changed */
 699                 p = st_ic[curr] + irq;
 700                 p->irq_name[0] = '\0';  /* This value means this is a dummy interrupt */
 701                 irq++;
 702         }
 703 }
 704
 705 /*
 706  ***************************************************************************
 707  * Main loop: Read stats from the relevant sources, and display them.
 708  *
 709  * IN:
 710  * @dis_hdr     Set to TRUE if the header line must always be printed.
 711  * @rows        Number of rows of screen.
 712  ***************************************************************************
 713  */
 714 void rw_mpstat_loop(int dis_hdr, int rows)
 715 {
 716         struct stats_cpu *scc;
 717         int cpu;
 718         int curr = 1, dis = 1;
 719         unsigned long lines = rows;
 720
 721         /* Dont buffer data if redirected to a pipe */
 722         setbuf(stdout, NULL);
 723
 724         /* Read stats */
 725         if (cpu_nr > 1) {
 726                 /*
 727                  * Init uptime0. So if /proc/uptime cannot fill it,
 728                  * this will be done by /proc/stat.
 729                  */
 730                 uptime0[0] = 0;
 731                 read_uptime(&(uptime0[0]));
 732         }
 733         read_stat_cpu(st_cpu[0], cpu_nr + 1, &(uptime[0]), &(uptime0[0]));
 734
 735         if (DISPLAY_IRQ_SUM(actflags)) {
 736                 read_stat_irq(st_irq[0], 1);
 737         }
 738
 739         if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
 740                 /* Read this file to display int per CPU or total nr of int per CPU */
 741                 read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, 0);
 742         }
 743
 744         if (DISPLAY_SOFTIRQS(actflags)) {
 745                 read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, 0);
 746         }
 747
 748         if (!interval) {
 749                 /* Display since boot time */
 750                 mp_tstamp[1] = mp_tstamp[0];
 751                 memset(st_cpu[1], 0, STATS_CPU_SIZE * (cpu_nr + 1));
 752                 memset(st_irq[1], 0, STATS_IRQ_SIZE * (cpu_nr + 1));
 753                 memset(st_irqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
 754                 if (DISPLAY_SOFTIRQS(actflags)) {
 755                         memset(st_softirqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
 756                 }
 757                 write_stats(0, DISP_HDR);
 758                 exit(0);
 759         }
 760
 761         /* Set a handler for SIGALRM */
 762         alarm_handler(0);
 763
 764         /* Save the first stats collected. Will be used to compute the average */
 765         mp_tstamp[2] = mp_tstamp[0];
 766         uptime[2] = uptime[0];
 767         uptime0[2] = uptime0[0];
 768         memcpy(st_cpu[2], st_cpu[0], STATS_CPU_SIZE * (cpu_nr + 1));
 769         memcpy(st_irq[2], st_irq[0], STATS_IRQ_SIZE * (cpu_nr + 1));
 770         memcpy(st_irqcpu[2], st_irqcpu[0], STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
 771         if (DISPLAY_SOFTIRQS(actflags)) {
 772                 memcpy(st_softirqcpu[2], st_softirqcpu[0],
 773                        STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
 774         }
 775
 776         pause();
 777
 778         do {
 779                 /*
 780                  * Resetting the structure not needed since every fields will be set.
 781                  * Exceptions are per-CPU structures: Some of them may not be filled
 782                  * if corresponding processor is disabled (offline). We set them to zero
 783                  * to be able to distinguish between offline and tickless CPUs.
 784                  */
 785                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 786                         scc = st_cpu[curr] + cpu;
 787                         memset(scc, 0, STATS_CPU_SIZE);
 788                 }
 789
 790                 /* Get time */
 791                 get_localtime(&(mp_tstamp[curr]));
 792
 793                 /* Read stats */
 794                 if (cpu_nr > 1) {
 795                         uptime0[curr] = 0;
 796                         read_uptime(&(uptime0[curr]));
 797                 }
 798                 read_stat_cpu(st_cpu[curr], cpu_nr + 1, &(uptime[curr]), &(uptime0[curr]));
 799
 800                 if (DISPLAY_IRQ_SUM(actflags)) {
 801                         read_stat_irq(st_irq[curr], 1);
 802                 }
 803
 804                 if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
 805                         read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, curr);
 806                 }
 807
 808                 if (DISPLAY_SOFTIRQS(actflags)) {
 809                         read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, curr);
 810                 }
 811
 812                 /* Write stats */
 813                 if (!dis_hdr) {
 814                         dis = lines / rows;
 815                         if (dis) {
 816                                 lines %= rows;
 817                         }
 818                         lines++;
 819                 }
 820                 write_stats(curr, dis);
 821
 822                 if (count > 0) {
 823                         count--;
 824                 }
 825                 if (count) {
 826                         curr ^= 1;
 827                         pause();
 828                 }
 829         }
 830         while (count);
 831
 832         /* Write stats average */
 833         write_stats_avg(curr, dis_hdr);
 834 }
 835
 836 /*
 837  ***************************************************************************
 838  * Main entry to the program
 839  ***************************************************************************
 840  */
 841 int main(int argc, char **argv)
 842 {
 843         int opt = 0, i, actset = FALSE;
 844         struct utsname header;
 845         int dis_hdr = -1;
 846         int rows = 23;
 847         char *t;
 848
 849 #ifdef USE_NLS
 850         /* Init National Language Support */
 851         init_nls();
 852 #endif
 853
 854         /* Get HZ */
 855         get_HZ();
 856
 857         /* How many processors on this machine ? */
 858         cpu_nr = get_cpu_nr(~0);
 859
 860         /* Calculate number of interrupts per processor */
 861         irqcpu_nr = get_irqcpu_nr(INTERRUPTS, NR_IRQS, cpu_nr) +
 862                     NR_IRQCPU_PREALLOC;
 863         /* Calculate number of soft interrupts per processor */
 864         softirqcpu_nr = get_irqcpu_nr(SOFTIRQS, NR_IRQS, cpu_nr) +
 865                         NR_IRQCPU_PREALLOC;
 866
 867         /*
 868          * cpu_nr: a value of 2 means there are 2 processors (0 and 1).
 869          * In this case, we have to allocate 3 structures: global, proc0 and proc1.
 870          */
 871         salloc_mp_struct(cpu_nr + 1);
 872
 873         while (++opt < argc) {
 874
 875                 if (!strcmp(argv[opt], "-I")) {
 876                         if (argv[++opt]) {
 877                                 actset = TRUE;
 878                                 if (!strcmp(argv[opt], K_SUM)) {
 879                                         /* Display total number of interrupts per CPU */
 880                                         actflags |= M_D_IRQ_SUM;
 881                                 }
 882                                 else if (!strcmp(argv[opt], K_CPU)) {
 883                                         /* Display interrupts per CPU */
 884                                         actflags |= M_D_IRQ_CPU;
 885                                 }
 886                                 else if (!strcmp(argv[opt], K_SCPU)) {
 887                                         /* Display soft interrupts per CPU */
 888                                         actflags |= M_D_SOFTIRQS;
 889                                 }
 890                                 else if (!strcmp(argv[opt], K_ALL)) {
 891                                         actflags |= M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
 892                                 }
 893                                 else {
 894                                         usage(argv[0]);
 895                                 }
 896                         }
 897                         else {
 898                                 usage(argv[0]);
 899                         }
 900                 }
 901
 902                 else if (!strcmp(argv[opt], "-P")) {
 903                         /* '-P ALL' can be used on UP machines */
 904                         if (argv[++opt]) {
 905                                 flags |= F_P_OPTION;
 906                                 dis_hdr++;
 907
 908                                 for (t = strtok(argv[opt], ","); t; t = strtok(NULL, ",")) {
 909                                         if (!strcmp(t, K_ALL) || !strcmp(t, K_ON)) {
 910                                                 if (cpu_nr) {
 911                                                         dis_hdr = 9;
 912                                                 }
 913                                                 /*
 914                                                  * Set bit for every processor.
 915                                                  * Also indicate to display stats for CPU 'all'.
 916                                                  */
 917                                                 memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
 918                                                 if (!strcmp(t, K_ON)) {
 919                                                         /* Display stats only for online CPU */
 920                                                         flags |= F_P_ON;
 921                                                 }
 922                                         }
 923                                         else {
 924                                                 if (strspn(t, DIGITS) != strlen(t)) {
 925                                                         usage(argv[0]);
 926                                                 }
 927                                                 i = atoi(t);    /* Get cpu number */
 928                                                 if (i >= cpu_nr) {
 929                                                         fprintf(stderr, _("Not that many processors!\n"));
 930                                                         exit(1);
 931                                                 }
 932                                                 i++;
 933                                                 *(cpu_bitmap + (i >> 3)) |= 1 << (i & 0x07);
 934                                         }
 935                                 }
 936                         }
 937                         else {
 938                                 usage(argv[0]);
 939                         }
 940                 }
 941
 942                 else if (!strncmp(argv[opt], "-", 1)) {
 943                         for (i = 1; *(argv[opt] + i); i++) {
 944
 945                                 switch (*(argv[opt] + i)) {
 946
 947                                 case 'A':
 948                                         actflags |= M_D_CPU + M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
 949                                         actset = TRUE;
 950                                         /* Select all processors */
 951                                         flags |= F_P_OPTION;
 952                                         memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
 953                                         break;
 954
 955                                 case 'u':
 956                                         /* Display CPU */
 957                                         actflags |= M_D_CPU;
 958                                         break;
 959
 960                                 case 'V':
 961                                         /* Print version number */
 962                                         print_version();
 963                                         break;
 964
 965                                 default:
 966                                         usage(argv[0]);
 967                                 }
 968                         }
 969                 }
 970
 971                 else if (interval < 0) {
 972                         /* Get interval */
 973                         if (strspn(argv[opt], DIGITS) != strlen(argv[opt])) {
 974                                 usage(argv[0]);
 975                         }
 976                         interval = atol(argv[opt]);
 977                         if (interval < 0) {
 978                                 usage(argv[0]);
 979                         }
 980                         count = -1;
 981                 }
 982
 983                 else if (count <= 0) {
 984                         /* Get count value */
 985                         if ((strspn(argv[opt], DIGITS) != strlen(argv[opt])) ||
 986                             !interval) {
 987                                 usage(argv[0]);
 988                         }
 989                         count = atol(argv[opt]);
 990                         if (count < 1) {
 991                                 usage(argv[0]);
 992                         }
 993                 }
 994
 995                 else {
 996                         usage(argv[0]);
 997                 }
 998         }
 999
1000         /* Default: Display CPU */
1001         if (!actset) {
1002                 actflags |= M_D_CPU;
1003         }
1004
1005         if (count_bits(&actflags, sizeof(unsigned int)) > 1) {
1006                 dis_hdr = 9;
1007         }
1008
1009         if (!USE_P_OPTION(flags)) {
1010                 /* Option -P not used: Set bit 0 (global stats among all proc) */
1011                 *cpu_bitmap = 1;
1012         }
1013         if (dis_hdr < 0) {
1014                 dis_hdr = 0;
1015         }
1016         if (!dis_hdr) {
1017                 /* Get window size */
1018                 rows = get_win_height();
1019         }
1020         if (interval < 0) {
1021                 /* Interval not set => display stats since boot time */
1022                 interval = 0;
1023         }
1024
1025         /* Get time */
1026         get_localtime(&(mp_tstamp[0]));
1027
1028         /* Get system name, release number and hostname */
1029         uname(&header);
1030         print_gal_header(&(mp_tstamp[0]), header.sysname, header.release,
1031                          header.nodename, header.machine, cpu_nr);
1032
1033         /* Main loop */
1034         rw_mpstat_loop(dis_hdr, rows);
1035
1036         /* Free structures */
1037         sfree_mp_struct();
1038
1039         return 0;
1040 }