tools/perf/builtin-stat.c

   1 /*
   2  * builtin-stat.c
   3  *
   4  * Builtin stat command: Give a precise performance counters summary
   5  * overview about any workload, CPU or specific PID.
   6  *
   7  * Sample output:
   8
   9    $ perf stat ~/hackbench 10
  10    Time: 0.104
  11
  12     Performance counter stats for '/home/mingo/hackbench':
  13
  14        1255.538611  task clock ticks     #      10.143 CPU utilization factor
  15              54011  context switches     #       0.043 M/sec
  16                385  CPU migrations       #       0.000 M/sec
  17              17755  pagefaults           #       0.014 M/sec
  18         3808323185  CPU cycles           #    3033.219 M/sec
  19         1575111190  instructions         #    1254.530 M/sec
  20           17367895  cache references     #      13.833 M/sec
  21            7674421  cache misses         #       6.112 M/sec
  22
  23     Wall-clock time elapsed:   123.786620 msecs
  24
  25  *
  26  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  27  *
  28  * Improvements and fixes by:
  29  *
  30  *   Arjan van de Ven <arjan@linux.intel.com>
  31  *   Yanmin Zhang <yanmin.zhang@intel.com>
  32  *   Wu Fengguang <fengguang.wu@intel.com>
  33  *   Mike Galbraith <efault@gmx.de>
  34  *   Paul Mackerras <paulus@samba.org>
  35  *   Jaswinder Singh Rajput <jaswinder@kernel.org>
  36  *
  37  * Released under the GPL v2. (and only v2, not any later version)
  38  */
  39
  40 #include "perf.h"
  41 #include "builtin.h"
  42 #include "util/util.h"
  43 #include "util/parse-options.h"
  44 #include "util/parse-events.h"
  45 #include "util/event.h"
  46 #include "util/debug.h"
  47 #include "util/header.h"
  48 #include "util/cpumap.h"
  49 #include "util/thread.h"
  50
  51 #include <sys/prctl.h>
  52 #include <math.h>
  53 #include <locale.h>
  54
  55 #define DEFAULT_SEPARATOR       " "
  56
  57 static struct perf_event_attr default_attrs[] = {
  58
  59   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
  60   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
  61   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
  62   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
  63
  64   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
  65   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
  66   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
  67   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
  68   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES        },
  69   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES            },
  70
  71 };
  72
  73 static bool                     system_wide                     =  false;
  74 static int                      nr_cpus                         =  0;
  75 static int                      run_idx                         =  0;
  76
  77 static int                      run_count                       =  1;
  78 static bool                     no_inherit                      = false;
  79 static bool                     scale                           =  true;
  80 static bool                     no_aggr                         = false;
  81 static pid_t                    target_pid                      = -1;
  82 static pid_t                    target_tid                      = -1;
  83 static pid_t                    *all_tids                       =  NULL;
  84 static int                      thread_num                      =  0;
  85 static pid_t                    child_pid                       = -1;
  86 static bool                     null_run                        =  false;
  87 static bool                     big_num                         =  true;
  88 static int                      big_num_opt                     =  -1;
  89 static const char               *cpu_list;
  90 static const char               *csv_sep                        = NULL;
  91 static bool                     csv_output                      = false;
  92
  93
  94 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
  95
  96 static int                      event_scaled[MAX_COUNTERS];
  97
  98 static struct {
  99         u64 val;
 100         u64 ena;
 101         u64 run;
 102 } cpu_counts[MAX_NR_CPUS][MAX_COUNTERS];
 103
 104 static volatile int done = 0;
 105
 106 struct stats
 107 {
 108         double n, mean, M2;
 109 };
 110
 111 static void update_stats(struct stats *stats, u64 val)
 112 {
 113         double delta;
 114
 115         stats->n++;
 116         delta = val - stats->mean;
 117         stats->mean += delta / stats->n;
 118         stats->M2 += delta*(val - stats->mean);
 119 }
 120
 121 static double avg_stats(struct stats *stats)
 122 {
 123         return stats->mean;
 124 }
 125
 126 /*
 127  * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
 128  *
 129  *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
 130  * s^2 = -------------------------------
 131  *                  n - 1
 132  *
 133  * http://en.wikipedia.org/wiki/Stddev
 134  *
 135  * The std dev of the mean is related to the std dev by:
 136  *
 137  *             s
 138  * s_mean = -------
 139  *          sqrt(n)
 140  *
 141  */
 142 static double stddev_stats(struct stats *stats)
 143 {
 144         double variance = stats->M2 / (stats->n - 1);
 145         double variance_mean = variance / stats->n;
 146
 147         return sqrt(variance_mean);
 148 }
 149
 150 struct stats                    event_res_stats[MAX_COUNTERS][3];
 151 struct stats                    runtime_nsecs_stats[MAX_NR_CPUS];
 152 struct stats                    runtime_cycles_stats[MAX_NR_CPUS];
 153 struct stats                    runtime_branches_stats[MAX_NR_CPUS];
 154 struct stats                    walltime_nsecs_stats;
 155
 156 #define MATCH_EVENT(t, c, counter)                      \
 157         (attrs[counter].type == PERF_TYPE_##t &&        \
 158          attrs[counter].config == PERF_COUNT_##c)
 159
 160 #define ERR_PERF_OPEN \
 161 "counter %d, sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information."
 162
 163 static int create_perf_stat_counter(int counter, bool *perm_err)
 164 {
 165         struct perf_event_attr *attr = attrs + counter;
 166         int thread;
 167         int ncreated = 0;
 168
 169         if (scale)
 170                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 171                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 172
 173         if (system_wide) {
 174                 int cpu;
 175
 176                 for (cpu = 0; cpu < nr_cpus; cpu++) {
 177                         fd[cpu][counter][0] = sys_perf_event_open(attr,
 178                                         -1, cpumap[cpu], -1, 0);
 179                         if (fd[cpu][counter][0] < 0) {
 180                                 if (errno == EPERM || errno == EACCES)
 181                                         *perm_err = true;
 182                                 error(ERR_PERF_OPEN, counter,
 183                                          fd[cpu][counter][0], strerror(errno));
 184                         } else {
 185                                 ++ncreated;
 186                         }
 187                 }
 188         } else {
 189                 attr->inherit = !no_inherit;
 190                 if (target_pid == -1 && target_tid == -1) {
 191                         attr->disabled = 1;
 192                         attr->enable_on_exec = 1;
 193                 }
 194                 for (thread = 0; thread < thread_num; thread++) {
 195                         fd[0][counter][thread] = sys_perf_event_open(attr,
 196                                 all_tids[thread], -1, -1, 0);
 197                         if (fd[0][counter][thread] < 0) {
 198                                 if (errno == EPERM || errno == EACCES)
 199                                         *perm_err = true;
 200                                 error(ERR_PERF_OPEN, counter,
 201                                          fd[0][counter][thread],
 202                                          strerror(errno));
 203                         } else {
 204                                 ++ncreated;
 205                         }
 206                 }
 207         }
 208
 209         return ncreated;
 210 }
 211
 212 /*
 213  * Does the counter have nsecs as a unit?
 214  */
 215 static inline int nsec_counter(int counter)
 216 {
 217         if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
 218             MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
 219                 return 1;
 220
 221         return 0;
 222 }
 223
 224 /*
 225  * Read out the results of a single counter:
 226  * aggregate counts across CPUs in system-wide mode
 227  */
 228 static void read_counter_aggr(int counter)
 229 {
 230         u64 count[3], single_count[3];
 231         int cpu;
 232         size_t res, nv;
 233         int scaled;
 234         int i, thread;
 235
 236         count[0] = count[1] = count[2] = 0;
 237
 238         nv = scale ? 3 : 1;
 239         for (cpu = 0; cpu < nr_cpus; cpu++) {
 240                 for (thread = 0; thread < thread_num; thread++) {
 241                         if (fd[cpu][counter][thread] < 0)
 242                                 continue;
 243
 244                         res = read(fd[cpu][counter][thread],
 245                                         single_count, nv * sizeof(u64));
 246                         assert(res == nv * sizeof(u64));
 247
 248                         close(fd[cpu][counter][thread]);
 249                         fd[cpu][counter][thread] = -1;
 250
 251                         count[0] += single_count[0];
 252                         if (scale) {
 253                                 count[1] += single_count[1];
 254                                 count[2] += single_count[2];
 255                         }
 256                 }
 257         }
 258
 259         scaled = 0;
 260         if (scale) {
 261                 if (count[2] == 0) {
 262                         event_scaled[counter] = -1;
 263                         count[0] = 0;
 264                         return;
 265                 }
 266
 267                 if (count[2] < count[1]) {
 268                         event_scaled[counter] = 1;
 269                         count[0] = (unsigned long long)
 270                                 ((double)count[0] * count[1] / count[2] + 0.5);
 271                 }
 272         }
 273
 274         for (i = 0; i < 3; i++)
 275                 update_stats(&event_res_stats[counter][i], count[i]);
 276
 277         if (verbose) {
 278                 fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter),
 279                                 count[0], count[1], count[2]);
 280         }
 281
 282         /*
 283          * Save the full runtime - to allow normalization during printout:
 284          */
 285         if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
 286                 update_stats(&runtime_nsecs_stats[0], count[0]);
 287         if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
 288                 update_stats(&runtime_cycles_stats[0], count[0]);
 289         if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter))
 290                 update_stats(&runtime_branches_stats[0], count[0]);
 291 }
 292
 293 /*
 294  * Read out the results of a single counter:
 295  * do not aggregate counts across CPUs in system-wide mode
 296  */
 297 static void read_counter(int counter)
 298 {
 299         u64 count[3];
 300         int cpu;
 301         size_t res, nv;
 302
 303         count[0] = count[1] = count[2] = 0;
 304
 305         nv = scale ? 3 : 1;
 306
 307         for (cpu = 0; cpu < nr_cpus; cpu++) {
 308
 309                 if (fd[cpu][counter][0] < 0)
 310                         continue;
 311
 312                 res = read(fd[cpu][counter][0], count, nv * sizeof(u64));
 313
 314                 assert(res == nv * sizeof(u64));
 315
 316                 close(fd[cpu][counter][0]);
 317                 fd[cpu][counter][0] = -1;
 318
 319                 if (scale) {
 320                         if (count[2] == 0) {
 321                                 count[0] = 0;
 322                         } else if (count[2] < count[1]) {
 323                                 count[0] = (unsigned long long)
 324                                 ((double)count[0] * count[1] / count[2] + 0.5);
 325                         }
 326                 }
 327                 cpu_counts[cpu][counter].val = count[0]; /* scaled count */
 328                 cpu_counts[cpu][counter].ena = count[1];
 329                 cpu_counts[cpu][counter].run = count[2];
 330
 331                 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
 332                         update_stats(&runtime_nsecs_stats[cpu], count[0]);
 333                 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
 334                         update_stats(&runtime_cycles_stats[cpu], count[0]);
 335                 if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter))
 336                         update_stats(&runtime_branches_stats[cpu], count[0]);
 337         }
 338 }
 339
 340 static int run_perf_stat(int argc __used, const char **argv)
 341 {
 342         unsigned long long t0, t1;
 343         int status = 0;
 344         int counter, ncreated = 0;
 345         int child_ready_pipe[2], go_pipe[2];
 346         bool perm_err = false;
 347         const bool forks = (argc > 0);
 348         char buf;
 349
 350         if (!system_wide)
 351                 nr_cpus = 1;
 352
 353         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 354                 perror("failed to create pipes");
 355                 exit(1);
 356         }
 357
 358         if (forks) {
 359                 if ((child_pid = fork()) < 0)
 360                         perror("failed to fork");
 361
 362                 if (!child_pid) {
 363                         close(child_ready_pipe[0]);
 364                         close(go_pipe[1]);
 365                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 366
 367                         /*
 368                          * Do a dummy execvp to get the PLT entry resolved,
 369                          * so we avoid the resolver overhead on the real
 370                          * execvp call.
 371                          */
 372                         execvp("", (char **)argv);
 373
 374                         /*
 375                          * Tell the parent we're ready to go
 376                          */
 377                         close(child_ready_pipe[1]);
 378
 379                         /*
 380                          * Wait until the parent tells us to go.
 381                          */
 382                         if (read(go_pipe[0], &buf, 1) == -1)
 383                                 perror("unable to read pipe");
 384
 385                         execvp(argv[0], (char **)argv);
 386
 387                         perror(argv[0]);
 388                         exit(-1);
 389                 }
 390
 391                 if (target_tid == -1 && target_pid == -1 && !system_wide)
 392                         all_tids[0] = child_pid;
 393
 394                 /*
 395                  * Wait for the child to be ready to exec.
 396                  */
 397                 close(child_ready_pipe[1]);
 398                 close(go_pipe[0]);
 399                 if (read(child_ready_pipe[0], &buf, 1) == -1)
 400                         perror("unable to read pipe");
 401                 close(child_ready_pipe[0]);
 402         }
 403
 404         for (counter = 0; counter < nr_counters; counter++)
 405                 ncreated += create_perf_stat_counter(counter, &perm_err);
 406
 407         if (ncreated < nr_counters) {
 408                 if (perm_err)
 409                         error("You may not have permission to collect %sstats.\n"
 410                               "\t Consider tweaking"
 411                               " /proc/sys/kernel/perf_event_paranoid or running as root.",
 412                               system_wide ? "system-wide " : "");
 413                 die("Not all events could be opened.\n");
 414                 if (child_pid != -1)
 415                         kill(child_pid, SIGTERM);
 416                 return -1;
 417         }
 418
 419         /*
 420          * Enable counters and exec the command:
 421          */
 422         t0 = rdclock();
 423
 424         if (forks) {
 425                 close(go_pipe[1]);
 426                 wait(&status);
 427         } else {
 428                 while(!done) sleep(1);
 429         }
 430
 431         t1 = rdclock();
 432
 433         update_stats(&walltime_nsecs_stats, t1 - t0);
 434
 435         if (no_aggr) {
 436                 for (counter = 0; counter < nr_counters; counter++)
 437                         read_counter(counter);
 438         } else {
 439                 for (counter = 0; counter < nr_counters; counter++)
 440                         read_counter_aggr(counter);
 441         }
 442         return WEXITSTATUS(status);
 443 }
 444
 445 static void print_noise(int counter, double avg)
 446 {
 447         if (run_count == 1)
 448                 return;
 449
 450         fprintf(stderr, "   ( +- %7.3f%% )",
 451                         100 * stddev_stats(&event_res_stats[counter][0]) / avg);
 452 }
 453
 454 static void nsec_printout(int cpu, int counter, double avg)
 455 {
 456         double msecs = avg / 1e6;
 457         char cpustr[16] = { '\0', };
 458         const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-24s";
 459
 460         if (no_aggr)
 461                 sprintf(cpustr, "CPU%*d%s",
 462                         csv_output ? 0 : -4,
 463                         cpumap[cpu], csv_sep);
 464
 465         fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(counter));
 466
 467         if (csv_output)
 468                 return;
 469
 470         if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
 471                 fprintf(stderr, " # %10.3f CPUs ",
 472                                 avg / avg_stats(&walltime_nsecs_stats));
 473         }
 474 }
 475
 476 static void abs_printout(int cpu, int counter, double avg)
 477 {
 478         double total, ratio = 0.0;
 479         char cpustr[16] = { '\0', };
 480         const char *fmt;
 481
 482         if (csv_output)
 483                 fmt = "%s%.0f%s%s";
 484         else if (big_num)
 485                 fmt = "%s%'18.0f%s%-24s";
 486         else
 487                 fmt = "%s%18.0f%s%-24s";
 488
 489         if (no_aggr)
 490                 sprintf(cpustr, "CPU%*d%s",
 491                         csv_output ? 0 : -4,
 492                         cpumap[cpu], csv_sep);
 493         else
 494                 cpu = 0;
 495
 496         fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(counter));
 497
 498         if (csv_output)
 499                 return;
 500
 501         if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
 502                 total = avg_stats(&runtime_cycles_stats[cpu]);
 503
 504                 if (total)
 505                         ratio = avg / total;
 506
 507                 fprintf(stderr, " # %10.3f IPC  ", ratio);
 508         } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) &&
 509                         runtime_branches_stats[cpu].n != 0) {
 510                 total = avg_stats(&runtime_branches_stats[cpu]);
 511
 512                 if (total)
 513                         ratio = avg * 100 / total;
 514
 515                 fprintf(stderr, " # %10.3f %%    ", ratio);
 516
 517         } else if (runtime_nsecs_stats[cpu].n != 0) {
 518                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 519
 520                 if (total)
 521                         ratio = 1000.0 * avg / total;
 522
 523                 fprintf(stderr, " # %10.3f M/sec", ratio);
 524         }
 525 }
 526
 527 /*
 528  * Print out the results of a single counter:
 529  * aggregated counts in system-wide mode
 530  */
 531 static void print_counter_aggr(int counter)
 532 {
 533         double avg = avg_stats(&event_res_stats[counter][0]);
 534         int scaled = event_scaled[counter];
 535
 536         if (scaled == -1) {
 537                 fprintf(stderr, "%*s%s%-24s\n",
 538                         csv_output ? 0 : 18,
 539                         "<not counted>", csv_sep, event_name(counter));
 540                 return;
 541         }
 542
 543         if (nsec_counter(counter))
 544                 nsec_printout(-1, counter, avg);
 545         else
 546                 abs_printout(-1, counter, avg);
 547
 548         if (csv_output) {
 549                 fputc('\n', stderr);
 550                 return;
 551         }
 552
 553         print_noise(counter, avg);
 554
 555         if (scaled) {
 556                 double avg_enabled, avg_running;
 557
 558                 avg_enabled = avg_stats(&event_res_stats[counter][1]);
 559                 avg_running = avg_stats(&event_res_stats[counter][2]);
 560
 561                 fprintf(stderr, "  (scaled from %.2f%%)",
 562                                 100 * avg_running / avg_enabled);
 563         }
 564
 565         fprintf(stderr, "\n");
 566 }
 567
 568 /*
 569  * Print out the results of a single counter:
 570  * does not use aggregated count in system-wide
 571  */
 572 static void print_counter(int counter)
 573 {
 574         u64 ena, run, val;
 575         int cpu;
 576
 577         for (cpu = 0; cpu < nr_cpus; cpu++) {
 578                 val = cpu_counts[cpu][counter].val;
 579                 ena = cpu_counts[cpu][counter].ena;
 580                 run = cpu_counts[cpu][counter].run;
 581                 if (run == 0 || ena == 0) {
 582                         fprintf(stderr, "CPU%*d%s%*s%s%-24s",
 583                                 csv_output ? 0 : -4,
 584                                 cpumap[cpu], csv_sep,
 585                                 csv_output ? 0 : 18,
 586                                 "<not counted>", csv_sep,
 587                                 event_name(counter));
 588
 589                         fprintf(stderr, "\n");
 590                         continue;
 591                 }
 592
 593                 if (nsec_counter(counter))
 594                         nsec_printout(cpu, counter, val);
 595                 else
 596                         abs_printout(cpu, counter, val);
 597
 598                 if (!csv_output) {
 599                         print_noise(counter, 1.0);
 600
 601                         if (run != ena) {
 602                                 fprintf(stderr, "  (scaled from %.2f%%)",
 603                                         100.0 * run / ena);
 604                         }
 605                 }
 606                 fprintf(stderr, "\n");
 607         }
 608 }
 609
 610 static void print_stat(int argc, const char **argv)
 611 {
 612         int i, counter;
 613
 614         fflush(stdout);
 615
 616         if (!csv_output) {
 617                 fprintf(stderr, "\n");
 618                 fprintf(stderr, " Performance counter stats for ");
 619                 if(target_pid == -1 && target_tid == -1) {
 620                         fprintf(stderr, "\'%s", argv[0]);
 621                         for (i = 1; i < argc; i++)
 622                                 fprintf(stderr, " %s", argv[i]);
 623                 } else if (target_pid != -1)
 624                         fprintf(stderr, "process id \'%d", target_pid);
 625                 else
 626                         fprintf(stderr, "thread id \'%d", target_tid);
 627
 628                 fprintf(stderr, "\'");
 629                 if (run_count > 1)
 630                         fprintf(stderr, " (%d runs)", run_count);
 631                 fprintf(stderr, ":\n\n");
 632         }
 633
 634         if (no_aggr) {
 635                 for (counter = 0; counter < nr_counters; counter++)
 636                         print_counter(counter);
 637         } else {
 638                 for (counter = 0; counter < nr_counters; counter++)
 639                         print_counter_aggr(counter);
 640         }
 641
 642         if (!csv_output) {
 643                 fprintf(stderr, "\n");
 644                 fprintf(stderr, " %18.9f  seconds time elapsed",
 645                                 avg_stats(&walltime_nsecs_stats)/1e9);
 646                 if (run_count > 1) {
 647                         fprintf(stderr, "   ( +- %7.3f%% )",
 648                                 100*stddev_stats(&walltime_nsecs_stats) /
 649                                 avg_stats(&walltime_nsecs_stats));
 650                 }
 651                 fprintf(stderr, "\n\n");
 652         }
 653 }
 654
 655 static volatile int signr = -1;
 656
 657 static void skip_signal(int signo)
 658 {
 659         if(child_pid == -1)
 660                 done = 1;
 661
 662         signr = signo;
 663 }
 664
 665 static void sig_atexit(void)
 666 {
 667         if (child_pid != -1)
 668                 kill(child_pid, SIGTERM);
 669
 670         if (signr == -1)
 671                 return;
 672
 673         signal(signr, SIG_DFL);
 674         kill(getpid(), signr);
 675 }
 676
 677 static const char * const stat_usage[] = {
 678         "perf stat [<options>] [<command>]",
 679         NULL
 680 };
 681
 682 static int stat__set_big_num(const struct option *opt __used,
 683                              const char *s __used, int unset)
 684 {
 685         big_num_opt = unset ? 0 : 1;
 686         return 0;
 687 }
 688
 689 static const struct option options[] = {
 690         OPT_CALLBACK('e', "event", NULL, "event",
 691                      "event selector. use 'perf list' to list available events",
 692                      parse_events),
 693         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
 694                     "child tasks do not inherit counters"),
 695         OPT_INTEGER('p', "pid", &target_pid,
 696                     "stat events on existing process id"),
 697         OPT_INTEGER('t', "tid", &target_tid,
 698                     "stat events on existing thread id"),
 699         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 700                     "system-wide collection from all CPUs"),
 701         OPT_BOOLEAN('c', "scale", &scale,
 702                     "scale/normalize counters"),
 703         OPT_INCR('v', "verbose", &verbose,
 704                     "be more verbose (show counter open errors, etc)"),
 705         OPT_INTEGER('r', "repeat", &run_count,
 706                     "repeat command and print average + stddev (max: 100)"),
 707         OPT_BOOLEAN('n', "null", &null_run,
 708                     "null run - dont start any counters"),
 709         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
 710                            "print large numbers with thousands\' separators",
 711                            stat__set_big_num),
 712         OPT_STRING('C', "cpu", &cpu_list, "cpu",
 713                     "list of cpus to monitor in system-wide"),
 714         OPT_BOOLEAN('A', "no-aggr", &no_aggr,
 715                     "disable CPU count aggregation"),
 716         OPT_STRING('x', "field-separator", &csv_sep, "separator",
 717                    "print counts with custom separator"),
 718         OPT_END()
 719 };
 720
 721 int cmd_stat(int argc, const char **argv, const char *prefix __used)
 722 {
 723         int status;
 724         int i,j;
 725
 726         setlocale(LC_ALL, "");
 727
 728         argc = parse_options(argc, argv, options, stat_usage,
 729                 PARSE_OPT_STOP_AT_NON_OPTION);
 730
 731         if (csv_sep)
 732                 csv_output = true;
 733         else
 734                 csv_sep = DEFAULT_SEPARATOR;
 735
 736         /*
 737          * let the spreadsheet do the pretty-printing
 738          */
 739         if (csv_output) {
 740                 /* User explicitely passed -B? */
 741                 if (big_num_opt == 1) {
 742                         fprintf(stderr, "-B option not supported with -x\n");
 743                         usage_with_options(stat_usage, options);
 744                 } else /* Nope, so disable big number formatting */
 745                         big_num = false;
 746         } else if (big_num_opt == 0) /* User passed --no-big-num */
 747                 big_num = false;
 748
 749         if (!argc && target_pid == -1 && target_tid == -1)
 750                 usage_with_options(stat_usage, options);
 751         if (run_count <= 0)
 752                 usage_with_options(stat_usage, options);
 753
 754         /* no_aggr is for system-wide only */
 755         if (no_aggr && !system_wide)
 756                 usage_with_options(stat_usage, options);
 757
 758         /* Set attrs and nr_counters if no event is selected and !null_run */
 759         if (!null_run && !nr_counters) {
 760                 memcpy(attrs, default_attrs, sizeof(default_attrs));
 761                 nr_counters = ARRAY_SIZE(default_attrs);
 762         }
 763
 764         if (system_wide)
 765                 nr_cpus = read_cpu_map(cpu_list);
 766         else
 767                 nr_cpus = 1;
 768
 769         if (nr_cpus < 1)
 770                 usage_with_options(stat_usage, options);
 771
 772         if (target_pid != -1) {
 773                 target_tid = target_pid;
 774                 thread_num = find_all_tid(target_pid, &all_tids);
 775                 if (thread_num <= 0) {
 776                         fprintf(stderr, "Can't find all threads of pid %d\n",
 777                                         target_pid);
 778                         usage_with_options(stat_usage, options);
 779                 }
 780         } else {
 781                 all_tids=malloc(sizeof(pid_t));
 782                 if (!all_tids)
 783                         return -ENOMEM;
 784
 785                 all_tids[0] = target_tid;
 786                 thread_num = 1;
 787         }
 788
 789         for (i = 0; i < MAX_NR_CPUS; i++) {
 790                 for (j = 0; j < MAX_COUNTERS; j++) {
 791                         fd[i][j] = malloc(sizeof(int)*thread_num);
 792                         if (!fd[i][j])
 793                                 return -ENOMEM;
 794                 }
 795         }
 796
 797         /*
 798          * We dont want to block the signals - that would cause
 799          * child tasks to inherit that and Ctrl-C would not work.
 800          * What we want is for Ctrl-C to work in the exec()-ed
 801          * task, but being ignored by perf stat itself:
 802          */
 803         atexit(sig_atexit);
 804         signal(SIGINT,  skip_signal);
 805         signal(SIGALRM, skip_signal);
 806         signal(SIGABRT, skip_signal);
 807
 808         status = 0;
 809         for (run_idx = 0; run_idx < run_count; run_idx++) {
 810                 if (run_count != 1 && verbose)
 811                         fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
 812                 status = run_perf_stat(argc, argv);
 813         }
 814
 815         if (status != -1)
 816                 print_stat(argc, argv);
 817
 818         return status;
 819 }