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

   1 /*
   2  * mpstat: per-processor statistics
   3  * (C) 2000-2014 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;
 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         for (cpu = 1; cpu <= cpu_nr; cpu++) {
 257
 258                 scc = st_cpu[curr] + cpu;
 259
 260                 /*
 261                  * Check if we want stats about this CPU.
 262                  * CPU must have been explicitly selected using option -P,
 263                  * else we display every CPU.
 264                  */
 265                 if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))) && USE_P_OPTION(flags))
 266                         continue;
 267
 268                 if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 269                      scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 270                      scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 271
 272                         /* Offline CPU found */
 273
 274                         if (DISPLAY_ONLINE_CPU(flags))
 275                                 continue;
 276                 }
 277
 278                 printf("%-11s  %3d", curr_string, cpu - 1);
 279
 280                 for (j = 0; j < ic_nr; j++) {
 281                         p0 = st_ic[curr] + j;   /* irq field set only for proc #0 */
 282                         /*
 283                          * An empty string for irq name means it is a remaining interrupt
 284                          * which is no longer used, for example because the
 285                          * number of interrupts has decreased in /proc/interrupts.
 286                          */
 287                         if (p0->irq_name[0] != '\0') {
 288                                 q0 = st_ic[prev] + j;
 289                                 offset = j;
 290
 291                                 /*
 292                                  * If we want stats for the time since system startup,
 293                                  * we have p0->irq != q0->irq, since q0 structure is
 294                                  * completely set to zero.
 295                                  */
 296                                 if (strcmp(p0->irq_name, q0->irq_name) && interval) {
 297                                         if (j)
 298                                                 offset = j - 1;
 299                                         q0 = st_ic[prev] + offset;
 300                                         if (strcmp(p0->irq_name, q0->irq_name) && (j + 1 < ic_nr))
 301                                                 offset = j + 1;
 302                                         q0 = st_ic[prev] + offset;
 303                                 }
 304
 305                                 if (!strcmp(p0->irq_name, q0->irq_name) || !interval) {
 306                                         p = st_ic[curr] + (cpu - 1) * ic_nr + j;
 307                                         q = st_ic[prev] + (cpu - 1) * ic_nr + offset;
 308                                         printf(" %10.2f",
 309                                                S_VALUE(q->interrupt, p->interrupt, itv));
 310                                 }
 311                                 else
 312                                         printf("        N/A");
 313                         }
 314                 }
 315                 printf("\n");
 316         }
 317 }
 318
 319 /*
 320  ***************************************************************************
 321  * Core function used to display statistics.
 322  *
 323  * IN:
 324  * @prev        Position in array where statistics used as reference are.
 325  *              Stats used as reference may be the previous ones read, or
 326  *              the very first ones when calculating the average.
 327  * @curr        Position in array where statistics for current sample are.
 328  * @dis         TRUE if a header line must be printed.
 329  * @prev_string String displayed at the beginning of a header line. This is
 330  *              the timestamp of the previous sample, or "Average" when
 331  *              displaying average stats.
 332  * @curr_string String displayed at the beginning of current sample stats.
 333  *              This is the timestamp of the current sample, or "Average"
 334  *              when displaying average stats.
 335  ***************************************************************************
 336  */
 337 void write_stats_core(int prev, int curr, int dis,
 338                       char *prev_string, char *curr_string)
 339 {
 340         struct stats_cpu *scc, *scp;
 341         unsigned long long itv, pc_itv, g_itv;
 342         int cpu;
 343
 344         /* Test stdout */
 345         TEST_STDOUT(STDOUT_FILENO);
 346
 347         /* Compute time interval */
 348         g_itv = get_interval(uptime[prev], uptime[curr]);
 349
 350         /* Reduce interval value to one processor */
 351         if (cpu_nr > 1) {
 352                 itv = get_interval(uptime0[prev], uptime0[curr]);
 353         }
 354         else {
 355                 itv = g_itv;
 356         }
 357
 358         /* Print CPU stats */
 359         if (DISPLAY_CPU(actflags)) {
 360                 if (dis) {
 361                         printf("\n%-11s  CPU    %%usr   %%nice    %%sys %%iowait    %%irq   "
 362                                "%%soft  %%steal  %%guest  %%gnice   %%idle\n",
 363                                prev_string);
 364                 }
 365
 366                 /* Check if we want global stats among all proc */
 367                 if (*cpu_bitmap & 1) {
 368
 369                         printf("%-11s  all", curr_string);
 370
 371                         printf("  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f\n",
 372                                (st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest) <
 373                                (st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest) ?
 374                                0.0 :
 375                                ll_sp_value(st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest,
 376                                            st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest,
 377                                            g_itv),
 378                                (st_cpu[curr]->cpu_nice - st_cpu[curr]->cpu_guest_nice) <
 379                                (st_cpu[prev]->cpu_nice - st_cpu[prev]->cpu_guest_nice) ?
 380                                0.0 :
 381                                ll_sp_value(st_cpu[prev]->cpu_nice - st_cpu[prev]->cpu_guest_nice,
 382                                            st_cpu[curr]->cpu_nice - st_cpu[curr]->cpu_guest_nice,
 383                                            g_itv),
 384                                ll_sp_value(st_cpu[prev]->cpu_sys,
 385                                            st_cpu[curr]->cpu_sys,
 386                                            g_itv),
 387                                ll_sp_value(st_cpu[prev]->cpu_iowait,
 388                                            st_cpu[curr]->cpu_iowait,
 389                                            g_itv),
 390                                ll_sp_value(st_cpu[prev]->cpu_hardirq,
 391                                            st_cpu[curr]->cpu_hardirq,
 392                                            g_itv),
 393                                ll_sp_value(st_cpu[prev]->cpu_softirq,
 394                                            st_cpu[curr]->cpu_softirq,
 395                                            g_itv),
 396                                ll_sp_value(st_cpu[prev]->cpu_steal,
 397                                            st_cpu[curr]->cpu_steal,
 398                                            g_itv),
 399                                ll_sp_value(st_cpu[prev]->cpu_guest,
 400                                            st_cpu[curr]->cpu_guest,
 401                                            g_itv),
 402                                ll_sp_value(st_cpu[prev]->cpu_guest_nice,
 403                                            st_cpu[curr]->cpu_guest_nice,
 404                                            g_itv),
 405                                (st_cpu[curr]->cpu_idle < st_cpu[prev]->cpu_idle) ?
 406                                0.0 :
 407                                ll_sp_value(st_cpu[prev]->cpu_idle,
 408                                            st_cpu[curr]->cpu_idle,
 409                                            g_itv));
 410                 }
 411
 412                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 413
 414                         scc = st_cpu[curr] + cpu;
 415                         scp = st_cpu[prev] + cpu;
 416
 417                         /* Check if we want stats about this proc */
 418                         if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
 419                                 continue;
 420
 421                         /*
 422                          * If the CPU is offline then it is omited from /proc/stat
 423                          * and the sum of all values is zero.
 424                          * (Remember that guest/guest_nice times are already included in
 425                          * user/nice modes.)
 426                          */
 427                         if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 428                              scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 429                              scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 430
 431                                 if (!DISPLAY_ONLINE_CPU(flags)) {
 432                                         printf("%-11s %4d"
 433                                                "  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f"
 434                                                "  %6.2f  %6.2f  %6.2f  %6.2f\n",
 435                                                curr_string, cpu - 1,
 436                                                0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
 437                                 }
 438                                 continue;
 439                         }
 440
 441                         printf("%-11s %4d", curr_string, cpu - 1);
 442
 443                         /* Recalculate itv for current proc */
 444                         pc_itv = get_per_cpu_interval(scc, scp);
 445
 446                         if (!pc_itv) {
 447                                 /*
 448                                  * If the CPU is tickless then there is no change in CPU values
 449                                  * but the sum of values is not zero.
 450                                  */
 451                                 printf("  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f"
 452                                        "  %6.2f  %6.2f  %6.2f  %6.2f\n",
 453                                        0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0);
 454                         }
 455
 456                         else {
 457                                 printf("  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f  %6.2f"
 458                                        "  %6.2f  %6.2f  %6.2f  %6.2f\n",
 459                                        (scc->cpu_user - scc->cpu_guest) < (scp->cpu_user - scp->cpu_guest) ?
 460                                        0.0 :
 461                                        ll_sp_value(scp->cpu_user - scp->cpu_guest,
 462                                                    scc->cpu_user - scc->cpu_guest,
 463                                                    pc_itv),
 464                                        (scc->cpu_nice - scc->cpu_guest_nice) < (scp->cpu_nice - scp->cpu_guest_nice) ?
 465                                        0.0 :
 466                                        ll_sp_value(scp->cpu_nice - scp->cpu_guest_nice,
 467                                                    scc->cpu_nice - scc->cpu_guest_nice,
 468                                                    pc_itv),
 469                                        ll_sp_value(scp->cpu_sys,
 470                                                    scc->cpu_sys,
 471                                                    pc_itv),
 472                                        ll_sp_value(scp->cpu_iowait,
 473                                                    scc->cpu_iowait,
 474                                                    pc_itv),
 475                                        ll_sp_value(scp->cpu_hardirq,
 476                                                    scc->cpu_hardirq,
 477                                                    pc_itv),
 478                                        ll_sp_value(scp->cpu_softirq,
 479                                                    scc->cpu_softirq,
 480                                                    pc_itv),
 481                                        ll_sp_value(scp->cpu_steal,
 482                                                    scc->cpu_steal,
 483                                                    pc_itv),
 484                                        ll_sp_value(scp->cpu_guest,
 485                                                    scc->cpu_guest,
 486                                                    pc_itv),
 487                                        ll_sp_value(scp->cpu_guest_nice,
 488                                                    scc->cpu_guest_nice,
 489                                                    pc_itv),
 490                                        (scc->cpu_idle < scp->cpu_idle) ?
 491                                        0.0 :
 492                                        ll_sp_value(scp->cpu_idle,
 493                                                    scc->cpu_idle,
 494                                                    pc_itv));
 495                         }
 496                 }
 497         }
 498
 499         /* Print total number of interrupts per processor */
 500         if (DISPLAY_IRQ_SUM(actflags)) {
 501                 struct stats_irq *sic, *sip;
 502
 503                 if (dis) {
 504                         printf("\n%-11s  CPU    intr/s\n", prev_string);
 505                 }
 506
 507                 if (*cpu_bitmap & 1) {
 508                         printf("%-11s  all %9.2f\n", curr_string,
 509                                S_VALUE(st_irq[prev]->irq_nr, st_irq[curr]->irq_nr, itv));
 510                 }
 511
 512                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 513
 514                         sic = st_irq[curr] + cpu;
 515                         sip = st_irq[prev] + cpu;
 516
 517                         scc = st_cpu[curr] + cpu;
 518                         scp = st_cpu[prev] + cpu;
 519
 520                         /* Check if we want stats about this proc */
 521                         if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
 522                                 continue;
 523
 524                         if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 525                              scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 526                              scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 527
 528                                 /* This is an offline CPU */
 529
 530                                 if (!DISPLAY_ONLINE_CPU(flags)) {
 531                                         printf("%-11s %4d"
 532                                                "  %9.2f\n",
 533                                                curr_string, cpu - 1,
 534                                                0.0);
 535                                 }
 536                                 continue;
 537                         }
 538
 539                         printf("%-11s %4d", curr_string, cpu - 1);
 540
 541                         /* Recalculate itv for current proc */
 542                         pc_itv = get_per_cpu_interval(scc, scp);
 543
 544                         if (!pc_itv) {
 545                                 /* This is a tickless CPU */
 546                                 printf(" %9.2f\n", 0.0);
 547                         }
 548                         else {
 549                                 printf(" %9.2f\n",
 550                                        S_VALUE(sip->irq_nr, sic->irq_nr, itv));
 551                         }
 552                 }
 553         }
 554
 555         if (DISPLAY_IRQ_CPU(actflags)) {
 556                 write_irqcpu_stats(st_irqcpu, irqcpu_nr, dis, itv, prev, curr,
 557                                    prev_string, curr_string);
 558         }
 559
 560         if (DISPLAY_SOFTIRQS(actflags)) {
 561                 write_irqcpu_stats(st_softirqcpu, softirqcpu_nr, dis, itv, prev, curr,
 562                                    prev_string, curr_string);
 563         }
 564
 565         /* Fix CPU counter values for every offline CPU */
 566         for (cpu = 1; cpu <= cpu_nr; cpu++) {
 567
 568                 scc = st_cpu[curr] + cpu;
 569                 scp = st_cpu[prev] + cpu;
 570
 571                 if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
 572                      scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
 573                      scc->cpu_hardirq + scc->cpu_softirq) == 0) {
 574                         /*
 575                          * Offline CPU found.
 576                          * Set current struct fields (which have been set to zero)
 577                          * to values from previous iteration. Hence their values won't
 578                          * jump from zero when the CPU comes back online.
 579                          */
 580                         *scc = *scp;
 581                 }
 582         }
 583 }
 584
 585 /*
 586  ***************************************************************************
 587  * Print statistics average.
 588  *
 589  * IN:
 590  * @curr        Position in array where statistics for current sample are.
 591  * @dis         TRUE if a header line must be printed.
 592  ***************************************************************************
 593  */
 594 void write_stats_avg(int curr, int dis)
 595 {
 596         char string[16];
 597
 598         strncpy(string, _("Average:"), 16);
 599         string[15] = '\0';
 600         write_stats_core(2, curr, dis, string, string);
 601 }
 602
 603 /*
 604  ***************************************************************************
 605  * Print statistics.
 606  *
 607  * IN:
 608  * @curr        Position in array where statistics for current sample are.
 609  * @dis         TRUE if a header line must be printed.
 610  ***************************************************************************
 611  */
 612 void write_stats(int curr, int dis)
 613 {
 614         char cur_time[2][16];
 615
 616         /* Get previous timestamp */
 617         strftime(cur_time[!curr], sizeof(cur_time[!curr]), "%X", &(mp_tstamp[!curr]));
 618
 619         /* Get current timestamp */
 620         strftime(cur_time[curr], sizeof(cur_time[curr]), "%X", &(mp_tstamp[curr]));
 621
 622         write_stats_core(!curr, curr, dis, cur_time[!curr], cur_time[curr]);
 623 }
 624
 625 /*
 626  ***************************************************************************
 627  * Read stats from /proc/interrupts or /proc/softirqs.
 628  *
 629  * IN:
 630  * @file        /proc file to read (interrupts or softirqs).
 631  * @ic_nr       Number of interrupts (hard or soft) per CPU.
 632  * @curr        Position in array where current statistics will be saved.
 633  *
 634  * OUT:
 635  * @st_ic       Array for per-CPU statistics.
 636  ***************************************************************************
 637  */
 638 void read_interrupts_stat(char *file, struct stats_irqcpu *st_ic[], int ic_nr, int curr)
 639 {
 640         FILE *fp;
 641         struct stats_irq *st_irq_i;
 642         struct stats_irqcpu *p;
 643         char *line = NULL, *li;
 644         unsigned long irq = 0;
 645         unsigned int cpu;
 646         int cpu_index[cpu_nr], index = 0, len;
 647         char *cp, *next;
 648
 649         for (cpu = 0; cpu < cpu_nr; cpu++) {
 650                 st_irq_i = st_irq[curr] + cpu + 1;
 651                 st_irq_i->irq_nr = 0;
 652         }
 653
 654         if ((fp = fopen(file, "r")) != NULL) {
 655
 656                 SREALLOC(line, char, INTERRUPTS_LINE + 11 * cpu_nr);
 657
 658                 /*
 659                  * Parse header line to see which CPUs are online
 660                  */
 661                 while (fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) {
 662                         next = line;
 663                         while (((cp = strstr(next, "CPU")) != NULL) && (index < cpu_nr)) {
 664                                 cpu = strtol(cp + 3, &next, 10);
 665                                 cpu_index[index++] = cpu;
 666                         }
 667                         if (index)
 668                                 /* Header line found */
 669                                 break;
 670                 }
 671
 672                 while ((fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) &&
 673                        (irq < ic_nr)) {
 674
 675                         /* Skip over "<irq>:" */
 676                         if ((cp = strchr(line, ':')) == NULL)
 677                                 /* Chr ':' not found */
 678                                 continue;
 679                         cp++;
 680
 681                         p = st_ic[curr] + irq;
 682
 683                         li = line;
 684                         while (*li == ' ')
 685                                 li++;
 686
 687                         len = strcspn(li, ":");
 688                         if (len >= MAX_IRQ_LEN) {
 689                                 len = MAX_IRQ_LEN - 1;
 690                         }
 691                         strncpy(p->irq_name, li, len);
 692                         p->irq_name[len] = '\0';
 693
 694                         for (cpu = 0; cpu < index; cpu++) {
 695                                 p = st_ic[curr] + cpu_index[cpu] * ic_nr + irq;
 696                                 st_irq_i = st_irq[curr] + cpu_index[cpu] + 1;
 697                                 /*
 698                                  * No need to set (st_irqcpu + cpu * irqcpu_nr)->irq:
 699                                  * This is the same as st_irqcpu->irq.
 700                                  */
 701                                 p->interrupt = strtoul(cp, &next, 10);
 702                                 st_irq_i->irq_nr += p->interrupt;
 703                                 cp = next;
 704                         }
 705                         irq++;
 706                 }
 707
 708                 fclose(fp);
 709
 710                 free(line);
 711         }
 712
 713         while (irq < ic_nr) {
 714                 /* Nb of interrupts per processor has changed */
 715                 p = st_ic[curr] + irq;
 716                 p->irq_name[0] = '\0';  /* This value means this is a dummy interrupt */
 717                 irq++;
 718         }
 719 }
 720
 721 /*
 722  ***************************************************************************
 723  * Main loop: Read stats from the relevant sources, and display them.
 724  *
 725  * IN:
 726  * @dis_hdr     Set to TRUE if the header line must always be printed.
 727  * @rows        Number of rows of screen.
 728  ***************************************************************************
 729  */
 730 void rw_mpstat_loop(int dis_hdr, int rows)
 731 {
 732         struct stats_cpu *scc;
 733         int cpu;
 734         int curr = 1, dis = 1;
 735         unsigned long lines = rows;
 736
 737         /* Dont buffer data if redirected to a pipe */
 738         setbuf(stdout, NULL);
 739
 740         /* Read stats */
 741         if (cpu_nr > 1) {
 742                 /*
 743                  * Init uptime0. So if /proc/uptime cannot fill it,
 744                  * this will be done by /proc/stat.
 745                  */
 746                 uptime0[0] = 0;
 747                 read_uptime(&(uptime0[0]));
 748         }
 749         read_stat_cpu(st_cpu[0], cpu_nr + 1, &(uptime[0]), &(uptime0[0]));
 750
 751         if (DISPLAY_IRQ_SUM(actflags)) {
 752                 read_stat_irq(st_irq[0], 1);
 753         }
 754
 755         if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
 756                 /* Read this file to display int per CPU or total nr of int per CPU */
 757                 read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, 0);
 758         }
 759
 760         if (DISPLAY_SOFTIRQS(actflags)) {
 761                 read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, 0);
 762         }
 763
 764         if (!interval) {
 765                 /* Display since boot time */
 766                 mp_tstamp[1] = mp_tstamp[0];
 767                 memset(st_cpu[1], 0, STATS_CPU_SIZE * (cpu_nr + 1));
 768                 memset(st_irq[1], 0, STATS_IRQ_SIZE * (cpu_nr + 1));
 769                 memset(st_irqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
 770                 if (DISPLAY_SOFTIRQS(actflags)) {
 771                         memset(st_softirqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
 772                 }
 773                 write_stats(0, DISP_HDR);
 774                 exit(0);
 775         }
 776
 777         /* Set a handler for SIGALRM */
 778         memset(&alrm_act, 0, sizeof(alrm_act));
 779         alrm_act.sa_handler = alarm_handler;
 780         sigaction(SIGALRM, &alrm_act, NULL);
 781         alarm(interval);
 782
 783         /* Save the first stats collected. Will be used to compute the average */
 784         mp_tstamp[2] = mp_tstamp[0];
 785         uptime[2] = uptime[0];
 786         uptime0[2] = uptime0[0];
 787         memcpy(st_cpu[2], st_cpu[0], STATS_CPU_SIZE * (cpu_nr + 1));
 788         memcpy(st_irq[2], st_irq[0], STATS_IRQ_SIZE * (cpu_nr + 1));
 789         memcpy(st_irqcpu[2], st_irqcpu[0], STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
 790         if (DISPLAY_SOFTIRQS(actflags)) {
 791                 memcpy(st_softirqcpu[2], st_softirqcpu[0],
 792                        STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
 793         }
 794
 795         /* Set a handler for SIGINT */
 796         memset(&int_act, 0, sizeof(int_act));
 797         int_act.sa_handler = int_handler;
 798         sigaction(SIGINT, &int_act, NULL);
 799
 800         pause();
 801
 802         if (sigint_caught)
 803                 /* SIGINT signal caught during first interval: Exit immediately */
 804                 return;
 805
 806         do {
 807                 /*
 808                  * Resetting the structure not needed since every fields will be set.
 809                  * Exceptions are per-CPU structures: Some of them may not be filled
 810                  * if corresponding processor is disabled (offline). We set them to zero
 811                  * to be able to distinguish between offline and tickless CPUs.
 812                  */
 813                 for (cpu = 1; cpu <= cpu_nr; cpu++) {
 814                         scc = st_cpu[curr] + cpu;
 815                         memset(scc, 0, STATS_CPU_SIZE);
 816                 }
 817
 818                 /* Get time */
 819                 get_localtime(&(mp_tstamp[curr]), 0);
 820
 821                 /* Read stats */
 822                 if (cpu_nr > 1) {
 823                         uptime0[curr] = 0;
 824                         read_uptime(&(uptime0[curr]));
 825                 }
 826                 read_stat_cpu(st_cpu[curr], cpu_nr + 1, &(uptime[curr]), &(uptime0[curr]));
 827
 828                 if (DISPLAY_IRQ_SUM(actflags)) {
 829                         read_stat_irq(st_irq[curr], 1);
 830                 }
 831
 832                 if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
 833                         read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, curr);
 834                 }
 835
 836                 if (DISPLAY_SOFTIRQS(actflags)) {
 837                         read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, curr);
 838                 }
 839
 840                 /* Write stats */
 841                 if (!dis_hdr) {
 842                         dis = lines / rows;
 843                         if (dis) {
 844                                 lines %= rows;
 845                         }
 846                         lines++;
 847                 }
 848                 write_stats(curr, dis);
 849
 850                 if (count > 0) {
 851                         count--;
 852                 }
 853
 854                 if (count) {
 855
 856                         pause();
 857
 858                         if (sigint_caught) {
 859                                 /* SIGINT signal caught => Display average stats */
 860                                 count = 0;
 861                                 printf("\n");   /* Skip "^C" displayed on screen */
 862                         }
 863                         else {
 864                                 curr ^= 1;
 865                         }
 866                 }
 867         }
 868         while (count);
 869
 870         /* Write stats average */
 871         write_stats_avg(curr, dis_hdr);
 872 }
 873
 874 /*
 875  ***************************************************************************
 876  * Main entry to the program
 877  ***************************************************************************
 878  */
 879 int main(int argc, char **argv)
 880 {
 881         int opt = 0, i, actset = FALSE;
 882         struct utsname header;
 883         int dis_hdr = -1;
 884         int rows = 23;
 885         char *t;
 886
 887 #ifdef USE_NLS
 888         /* Init National Language Support */
 889         init_nls();
 890 #endif
 891
 892         /* Get HZ */
 893         get_HZ();
 894
 895         /* What is the highest processor number on this machine? */
 896         cpu_nr = get_cpu_nr(~0, TRUE);
 897
 898         /* Calculate number of interrupts per processor */
 899         irqcpu_nr = get_irqcpu_nr(INTERRUPTS, NR_IRQS, cpu_nr) +
 900                     NR_IRQCPU_PREALLOC;
 901         /* Calculate number of soft interrupts per processor */
 902         softirqcpu_nr = get_irqcpu_nr(SOFTIRQS, NR_IRQS, cpu_nr) +
 903                         NR_IRQCPU_PREALLOC;
 904
 905         /*
 906          * cpu_nr: a value of 2 means there are 2 processors (0 and 1).
 907          * In this case, we have to allocate 3 structures: global, proc0 and proc1.
 908          */
 909         salloc_mp_struct(cpu_nr + 1);
 910
 911         while (++opt < argc) {
 912
 913                 if (!strcmp(argv[opt], "-I")) {
 914                         if (argv[++opt]) {
 915                                 actset = TRUE;
 916                                 if (!strcmp(argv[opt], K_SUM)) {
 917                                         /* Display total number of interrupts per CPU */
 918                                         actflags |= M_D_IRQ_SUM;
 919                                 }
 920                                 else if (!strcmp(argv[opt], K_CPU)) {
 921                                         /* Display interrupts per CPU */
 922                                         actflags |= M_D_IRQ_CPU;
 923                                 }
 924                                 else if (!strcmp(argv[opt], K_SCPU)) {
 925                                         /* Display soft interrupts per CPU */
 926                                         actflags |= M_D_SOFTIRQS;
 927                                 }
 928                                 else if (!strcmp(argv[opt], K_ALL)) {
 929                                         actflags |= M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
 930                                 }
 931                                 else {
 932                                         usage(argv[0]);
 933                                 }
 934                         }
 935                         else {
 936                                 usage(argv[0]);
 937                         }
 938                 }
 939
 940                 else if (!strcmp(argv[opt], "-P")) {
 941                         /* '-P ALL' can be used on UP machines */
 942                         if (argv[++opt]) {
 943                                 flags |= F_P_OPTION;
 944                                 dis_hdr++;
 945
 946                                 for (t = strtok(argv[opt], ","); t; t = strtok(NULL, ",")) {
 947                                         if (!strcmp(t, K_ALL) || !strcmp(t, K_ON)) {
 948                                                 if (cpu_nr) {
 949                                                         dis_hdr = 9;
 950                                                 }
 951                                                 /*
 952                                                  * Set bit for every processor.
 953                                                  * Also indicate to display stats for CPU 'all'.
 954                                                  */
 955                                                 memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
 956                                                 if (!strcmp(t, K_ON)) {
 957                                                         /* Display stats only for online CPU */
 958                                                         flags |= F_P_ON;
 959                                                 }
 960                                         }
 961                                         else {
 962                                                 if (strspn(t, DIGITS) != strlen(t)) {
 963                                                         usage(argv[0]);
 964                                                 }
 965                                                 i = atoi(t);    /* Get cpu number */
 966                                                 if (i >= cpu_nr) {
 967                                                         fprintf(stderr, _("Not that many processors!\n"));
 968                                                         exit(1);
 969                                                 }
 970                                                 i++;
 971                                                 *(cpu_bitmap + (i >> 3)) |= 1 << (i & 0x07);
 972                                         }
 973                                 }
 974                         }
 975                         else {
 976                                 usage(argv[0]);
 977                         }
 978                 }
 979
 980                 else if (!strncmp(argv[opt], "-", 1)) {
 981                         for (i = 1; *(argv[opt] + i); i++) {
 982
 983                                 switch (*(argv[opt] + i)) {
 984
 985                                 case 'A':
 986                                         actflags |= M_D_CPU + M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
 987                                         actset = TRUE;
 988                                         /* Select all processors */
 989                                         flags |= F_P_OPTION;
 990                                         memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
 991                                         break;
 992
 993                                 case 'u':
 994                                         /* Display CPU */
 995                                         actflags |= M_D_CPU;
 996                                         break;
 997
 998                                 case 'V':
 999                                         /* Print version number */
1000                                         print_version();
1001                                         break;
1002
1003                                 default:
1004                                         usage(argv[0]);
1005                                 }
1006                         }
1007                 }
1008
1009                 else if (interval < 0) {
1010                         /* Get interval */
1011                         if (strspn(argv[opt], DIGITS) != strlen(argv[opt])) {
1012                                 usage(argv[0]);
1013                         }
1014                         interval = atol(argv[opt]);
1015                         if (interval < 0) {
1016                                 usage(argv[0]);
1017                         }
1018                         count = -1;
1019                 }
1020
1021                 else if (count <= 0) {
1022                         /* Get count value */
1023                         if ((strspn(argv[opt], DIGITS) != strlen(argv[opt])) ||
1024                             !interval) {
1025                                 usage(argv[0]);
1026                         }
1027                         count = atol(argv[opt]);
1028                         if (count < 1) {
1029                                 usage(argv[0]);
1030                         }
1031                 }
1032
1033                 else {
1034                         usage(argv[0]);
1035                 }
1036         }
1037
1038         /* Default: Display CPU */
1039         if (!actset) {
1040                 actflags |= M_D_CPU;
1041         }
1042
1043         if (count_bits(&actflags, sizeof(unsigned int)) > 1) {
1044                 dis_hdr = 9;
1045         }
1046
1047         if (!USE_P_OPTION(flags)) {
1048                 /* Option -P not used: Set bit 0 (global stats among all proc) */
1049                 *cpu_bitmap = 1;
1050         }
1051         if (dis_hdr < 0) {
1052                 dis_hdr = 0;
1053         }
1054         if (!dis_hdr) {
1055                 /* Get window size */
1056                 rows = get_win_height();
1057         }
1058         if (interval < 0) {
1059                 /* Interval not set => display stats since boot time */
1060                 interval = 0;
1061         }
1062
1063         /* Get time */
1064         get_localtime(&(mp_tstamp[0]), 0);
1065
1066         /* Get system name, release number and hostname */
1067         uname(&header);
1068         print_gal_header(&(mp_tstamp[0]), header.sysname, header.release,
1069                          header.nodename, header.machine, get_cpu_nr(~0, FALSE));
1070
1071         /* Main loop */
1072         rw_mpstat_loop(dis_hdr, rows);
1073
1074         /* Free structures */
1075         sfree_mp_struct();
1076
1077         return 0;
1078 }