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
  11   Time: 0.118
  12
  13   Performance counter stats for './hackbench 10':
  14
  15        1708.761321 task-clock                #   11.037 CPUs utilized
  16             41,190 context-switches          #    0.024 M/sec
  17              6,735 CPU-migrations            #    0.004 M/sec
  18             17,318 page-faults               #    0.010 M/sec
  19      5,205,202,243 cycles                    #    3.046 GHz
  20      3,856,436,920 stalled-cycles-frontend   #   74.09% frontend cycles idle
  21      1,600,790,871 stalled-cycles-backend    #   30.75% backend  cycles idle
  22      2,603,501,247 instructions              #    0.50  insns per cycle
  23                                              #    1.48  stalled cycles per insn
  24        484,357,498 branches                  #  283.455 M/sec
  25          6,388,934 branch-misses             #    1.32% of all branches
  26
  27         0.154822978  seconds time elapsed
  28
  29  *
  30  * Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  31  *
  32  * Improvements and fixes by:
  33  *
  34  *   Arjan van de Ven <arjan@linux.intel.com>
  35  *   Yanmin Zhang <yanmin.zhang@intel.com>
  36  *   Wu Fengguang <fengguang.wu@intel.com>
  37  *   Mike Galbraith <efault@gmx.de>
  38  *   Paul Mackerras <paulus@samba.org>
  39  *   Jaswinder Singh Rajput <jaswinder@kernel.org>
  40  *
  41  * Released under the GPL v2. (and only v2, not any later version)
  42  */
  43
  44 #include "perf.h"
  45 #include "builtin.h"
  46 #include "util/cgroup.h"
  47 #include "util/util.h"
  48 #include "util/parse-options.h"
  49 #include "util/parse-events.h"
  50 #include "util/pmu.h"
  51 #include "util/event.h"
  52 #include "util/evlist.h"
  53 #include "util/evsel.h"
  54 #include "util/debug.h"
  55 #include "util/color.h"
  56 #include "util/stat.h"
  57 #include "util/header.h"
  58 #include "util/cpumap.h"
  59 #include "util/thread.h"
  60 #include "util/thread_map.h"
  61 #include "util/counts.h"
  62
  63 #include <stdlib.h>
  64 #include <sys/prctl.h>
  65 #include <locale.h>
  66
  67 #define DEFAULT_SEPARATOR       " "
  68 #define CNTR_NOT_SUPPORTED      "<not supported>"
  69 #define CNTR_NOT_COUNTED        "<not counted>"
  70
  71 static void print_counters(struct timespec *ts, int argc, const char **argv);
  72
  73 /* Default events used for perf stat -T */
  74 static const char *transaction_attrs = {
  75         "task-clock,"
  76         "{"
  77         "instructions,"
  78         "cycles,"
  79         "cpu/cycles-t/,"
  80         "cpu/tx-start/,"
  81         "cpu/el-start/,"
  82         "cpu/cycles-ct/"
  83         "}"
  84 };
  85
  86 /* More limited version when the CPU does not have all events. */
  87 static const char * transaction_limited_attrs = {
  88         "task-clock,"
  89         "{"
  90         "instructions,"
  91         "cycles,"
  92         "cpu/cycles-t/,"
  93         "cpu/tx-start/"
  94         "}"
  95 };
  96
  97 static struct perf_evlist       *evsel_list;
  98
  99 static struct target target = {
 100         .uid    = UINT_MAX,
 101 };
 102
 103 typedef int (*aggr_get_id_t)(struct cpu_map *m, int cpu);
 104
 105 static int                      run_count                       =  1;
 106 static bool                     no_inherit                      = false;
 107 static volatile pid_t           child_pid                       = -1;
 108 static bool                     null_run                        =  false;
 109 static int                      detailed_run                    =  0;
 110 static bool                     transaction_run;
 111 static bool                     big_num                         =  true;
 112 static int                      big_num_opt                     =  -1;
 113 static const char               *csv_sep                        = NULL;
 114 static bool                     csv_output                      = false;
 115 static bool                     group                           = false;
 116 static const char               *pre_cmd                        = NULL;
 117 static const char               *post_cmd                       = NULL;
 118 static bool                     sync_run                        = false;
 119 static unsigned int             initial_delay                   = 0;
 120 static unsigned int             unit_width                      = 4; /* strlen("unit") */
 121 static bool                     forever                         = false;
 122 static struct timespec          ref_time;
 123 static struct cpu_map           *aggr_map;
 124 static aggr_get_id_t            aggr_get_id;
 125 static bool                     append_file;
 126 static const char               *output_name;
 127 static int                      output_fd;
 128
 129 static volatile int done = 0;
 130
 131 static struct perf_stat_config stat_config = {
 132         .aggr_mode      = AGGR_GLOBAL,
 133         .scale          = true,
 134 };
 135
 136 static inline void diff_timespec(struct timespec *r, struct timespec *a,
 137                                  struct timespec *b)
 138 {
 139         r->tv_sec = a->tv_sec - b->tv_sec;
 140         if (a->tv_nsec < b->tv_nsec) {
 141                 r->tv_nsec = a->tv_nsec + 1000000000L - b->tv_nsec;
 142                 r->tv_sec--;
 143         } else {
 144                 r->tv_nsec = a->tv_nsec - b->tv_nsec ;
 145         }
 146 }
 147
 148 static void perf_stat__reset_stats(void)
 149 {
 150         perf_evlist__reset_stats(evsel_list);
 151         perf_stat__reset_shadow_stats();
 152 }
 153
 154 static int create_perf_stat_counter(struct perf_evsel *evsel)
 155 {
 156         struct perf_event_attr *attr = &evsel->attr;
 157
 158         if (stat_config.scale)
 159                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 160                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 161
 162         attr->inherit = !no_inherit;
 163
 164         /*
 165          * Some events get initialized with sample_(period/type) set,
 166          * like tracepoints. Clear it up for counting.
 167          */
 168         attr->sample_period = 0;
 169         attr->sample_type   = 0;
 170
 171         if (target__has_cpu(&target))
 172                 return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));
 173
 174         if (!target__has_task(&target) && perf_evsel__is_group_leader(evsel)) {
 175                 attr->disabled = 1;
 176                 if (!initial_delay)
 177                         attr->enable_on_exec = 1;
 178         }
 179
 180         return perf_evsel__open_per_thread(evsel, evsel_list->threads);
 181 }
 182
 183 /*
 184  * Does the counter have nsecs as a unit?
 185  */
 186 static inline int nsec_counter(struct perf_evsel *evsel)
 187 {
 188         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
 189             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 190                 return 1;
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * Read out the results of a single counter:
 197  * do not aggregate counts across CPUs in system-wide mode
 198  */
 199 static int read_counter(struct perf_evsel *counter)
 200 {
 201         int nthreads = thread_map__nr(evsel_list->threads);
 202         int ncpus = perf_evsel__nr_cpus(counter);
 203         int cpu, thread;
 204
 205         if (!counter->supported)
 206                 return -ENOENT;
 207
 208         if (counter->system_wide)
 209                 nthreads = 1;
 210
 211         for (thread = 0; thread < nthreads; thread++) {
 212                 for (cpu = 0; cpu < ncpus; cpu++) {
 213                         struct perf_counts_values *count;
 214
 215                         count = perf_counts(counter->counts, cpu, thread);
 216                         if (perf_evsel__read(counter, cpu, thread, count))
 217                                 return -1;
 218                 }
 219         }
 220
 221         return 0;
 222 }
 223
 224 static void read_counters(bool close_counters)
 225 {
 226         struct perf_evsel *counter;
 227
 228         evlist__for_each(evsel_list, counter) {
 229                 if (read_counter(counter))
 230                         pr_debug("failed to read counter %s\n", counter->name);
 231
 232                 if (perf_stat_process_counter(&stat_config, counter))
 233                         pr_warning("failed to process counter %s\n", counter->name);
 234
 235                 if (close_counters) {
 236                         perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
 237                                              thread_map__nr(evsel_list->threads));
 238                 }
 239         }
 240 }
 241
 242 static void process_interval(void)
 243 {
 244         struct timespec ts, rs;
 245
 246         read_counters(false);
 247
 248         clock_gettime(CLOCK_MONOTONIC, &ts);
 249         diff_timespec(&rs, &ts, &ref_time);
 250
 251         print_counters(&rs, 0, NULL);
 252 }
 253
 254 static void handle_initial_delay(void)
 255 {
 256         if (initial_delay) {
 257                 usleep(initial_delay * 1000);
 258                 perf_evlist__enable(evsel_list);
 259         }
 260 }
 261
 262 static volatile int workload_exec_errno;
 263
 264 /*
 265  * perf_evlist__prepare_workload will send a SIGUSR1
 266  * if the fork fails, since we asked by setting its
 267  * want_signal to true.
 268  */
 269 static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
 270                                         void *ucontext __maybe_unused)
 271 {
 272         workload_exec_errno = info->si_value.sival_int;
 273 }
 274
 275 static int __run_perf_stat(int argc, const char **argv)
 276 {
 277         int interval = stat_config.interval;
 278         char msg[512];
 279         unsigned long long t0, t1;
 280         struct perf_evsel *counter;
 281         struct timespec ts;
 282         size_t l;
 283         int status = 0;
 284         const bool forks = (argc > 0);
 285
 286         if (interval) {
 287                 ts.tv_sec  = interval / 1000;
 288                 ts.tv_nsec = (interval % 1000) * 1000000;
 289         } else {
 290                 ts.tv_sec  = 1;
 291                 ts.tv_nsec = 0;
 292         }
 293
 294         if (forks) {
 295                 if (perf_evlist__prepare_workload(evsel_list, &target, argv, false,
 296                                                   workload_exec_failed_signal) < 0) {
 297                         perror("failed to prepare workload");
 298                         return -1;
 299                 }
 300                 child_pid = evsel_list->workload.pid;
 301         }
 302
 303         if (group)
 304                 perf_evlist__set_leader(evsel_list);
 305
 306         evlist__for_each(evsel_list, counter) {
 307                 if (create_perf_stat_counter(counter) < 0) {
 308                         /*
 309                          * PPC returns ENXIO for HW counters until 2.6.37
 310                          * (behavior changed with commit b0a873e).
 311                          */
 312                         if (errno == EINVAL || errno == ENOSYS ||
 313                             errno == ENOENT || errno == EOPNOTSUPP ||
 314                             errno == ENXIO) {
 315                                 if (verbose)
 316                                         ui__warning("%s event is not supported by the kernel.\n",
 317                                                     perf_evsel__name(counter));
 318                                 counter->supported = false;
 319
 320                                 if ((counter->leader != counter) ||
 321                                     !(counter->leader->nr_members > 1))
 322                                         continue;
 323                         }
 324
 325                         perf_evsel__open_strerror(counter, &target,
 326                                                   errno, msg, sizeof(msg));
 327                         ui__error("%s\n", msg);
 328
 329                         if (child_pid != -1)
 330                                 kill(child_pid, SIGTERM);
 331
 332                         return -1;
 333                 }
 334                 counter->supported = true;
 335
 336                 l = strlen(counter->unit);
 337                 if (l > unit_width)
 338                         unit_width = l;
 339         }
 340
 341         if (perf_evlist__apply_filters(evsel_list, &counter)) {
 342                 error("failed to set filter \"%s\" on event %s with %d (%s)\n",
 343                         counter->filter, perf_evsel__name(counter), errno,
 344                         strerror_r(errno, msg, sizeof(msg)));
 345                 return -1;
 346         }
 347
 348         /*
 349          * Enable counters and exec the command:
 350          */
 351         t0 = rdclock();
 352         clock_gettime(CLOCK_MONOTONIC, &ref_time);
 353
 354         if (forks) {
 355                 perf_evlist__start_workload(evsel_list);
 356                 handle_initial_delay();
 357
 358                 if (interval) {
 359                         while (!waitpid(child_pid, &status, WNOHANG)) {
 360                                 nanosleep(&ts, NULL);
 361                                 process_interval();
 362                         }
 363                 }
 364                 wait(&status);
 365
 366                 if (workload_exec_errno) {
 367                         const char *emsg = strerror_r(workload_exec_errno, msg, sizeof(msg));
 368                         pr_err("Workload failed: %s\n", emsg);
 369                         return -1;
 370                 }
 371
 372                 if (WIFSIGNALED(status))
 373                         psignal(WTERMSIG(status), argv[0]);
 374         } else {
 375                 handle_initial_delay();
 376                 while (!done) {
 377                         nanosleep(&ts, NULL);
 378                         if (interval)
 379                                 process_interval();
 380                 }
 381         }
 382
 383         t1 = rdclock();
 384
 385         update_stats(&walltime_nsecs_stats, t1 - t0);
 386
 387         read_counters(true);
 388
 389         return WEXITSTATUS(status);
 390 }
 391
 392 static int run_perf_stat(int argc, const char **argv)
 393 {
 394         int ret;
 395
 396         if (pre_cmd) {
 397                 ret = system(pre_cmd);
 398                 if (ret)
 399                         return ret;
 400         }
 401
 402         if (sync_run)
 403                 sync();
 404
 405         ret = __run_perf_stat(argc, argv);
 406         if (ret)
 407                 return ret;
 408
 409         if (post_cmd) {
 410                 ret = system(post_cmd);
 411                 if (ret)
 412                         return ret;
 413         }
 414
 415         return ret;
 416 }
 417
 418 static void print_running(u64 run, u64 ena)
 419 {
 420         if (csv_output) {
 421                 fprintf(stat_config.output, "%s%" PRIu64 "%s%.2f",
 422                                         csv_sep,
 423                                         run,
 424                                         csv_sep,
 425                                         ena ? 100.0 * run / ena : 100.0);
 426         } else if (run != ena) {
 427                 fprintf(stat_config.output, "  (%.2f%%)", 100.0 * run / ena);
 428         }
 429 }
 430
 431 static void print_noise_pct(double total, double avg)
 432 {
 433         double pct = rel_stddev_stats(total, avg);
 434
 435         if (csv_output)
 436                 fprintf(stat_config.output, "%s%.2f%%", csv_sep, pct);
 437         else if (pct)
 438                 fprintf(stat_config.output, "  ( +-%6.2f%% )", pct);
 439 }
 440
 441 static void print_noise(struct perf_evsel *evsel, double avg)
 442 {
 443         struct perf_stat_evsel *ps;
 444
 445         if (run_count == 1)
 446                 return;
 447
 448         ps = evsel->priv;
 449         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
 450 }
 451
 452 static void aggr_printout(struct perf_evsel *evsel, int id, int nr)
 453 {
 454         switch (stat_config.aggr_mode) {
 455         case AGGR_CORE:
 456                 fprintf(stat_config.output, "S%d-C%*d%s%*d%s",
 457                         cpu_map__id_to_socket(id),
 458                         csv_output ? 0 : -8,
 459                         cpu_map__id_to_cpu(id),
 460                         csv_sep,
 461                         csv_output ? 0 : 4,
 462                         nr,
 463                         csv_sep);
 464                 break;
 465         case AGGR_SOCKET:
 466                 fprintf(stat_config.output, "S%*d%s%*d%s",
 467                         csv_output ? 0 : -5,
 468                         id,
 469                         csv_sep,
 470                         csv_output ? 0 : 4,
 471                         nr,
 472                         csv_sep);
 473                         break;
 474         case AGGR_NONE:
 475                 fprintf(stat_config.output, "CPU%*d%s",
 476                         csv_output ? 0 : -4,
 477                         perf_evsel__cpus(evsel)->map[id], csv_sep);
 478                 break;
 479         case AGGR_THREAD:
 480                 fprintf(stat_config.output, "%*s-%*d%s",
 481                         csv_output ? 0 : 16,
 482                         thread_map__comm(evsel->threads, id),
 483                         csv_output ? 0 : -8,
 484                         thread_map__pid(evsel->threads, id),
 485                         csv_sep);
 486                 break;
 487         case AGGR_GLOBAL:
 488         case AGGR_UNSET:
 489         default:
 490                 break;
 491         }
 492 }
 493
 494 static void nsec_printout(int id, int nr, struct perf_evsel *evsel, double avg)
 495 {
 496         FILE *output = stat_config.output;
 497         double msecs = avg / 1e6;
 498         const char *fmt_v, *fmt_n;
 499         char name[25];
 500
 501         fmt_v = csv_output ? "%.6f%s" : "%18.6f%s";
 502         fmt_n = csv_output ? "%s" : "%-25s";
 503
 504         aggr_printout(evsel, id, nr);
 505
 506         scnprintf(name, sizeof(name), "%s%s",
 507                   perf_evsel__name(evsel), csv_output ? "" : " (msec)");
 508
 509         fprintf(output, fmt_v, msecs, csv_sep);
 510
 511         if (csv_output)
 512                 fprintf(output, "%s%s", evsel->unit, csv_sep);
 513         else
 514                 fprintf(output, "%-*s%s", unit_width, evsel->unit, csv_sep);
 515
 516         fprintf(output, fmt_n, name);
 517
 518         if (evsel->cgrp)
 519                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
 520 }
 521
 522 static void abs_printout(int id, int nr, struct perf_evsel *evsel, double avg)
 523 {
 524         FILE *output = stat_config.output;
 525         double sc =  evsel->scale;
 526         const char *fmt;
 527
 528         if (csv_output) {
 529                 fmt = sc != 1.0 ?  "%.2f%s" : "%.0f%s";
 530         } else {
 531                 if (big_num)
 532                         fmt = sc != 1.0 ? "%'18.2f%s" : "%'18.0f%s";
 533                 else
 534                         fmt = sc != 1.0 ? "%18.2f%s" : "%18.0f%s";
 535         }
 536
 537         aggr_printout(evsel, id, nr);
 538
 539         fprintf(output, fmt, avg, csv_sep);
 540
 541         if (evsel->unit)
 542                 fprintf(output, "%-*s%s",
 543                         csv_output ? 0 : unit_width,
 544                         evsel->unit, csv_sep);
 545
 546         fprintf(output, "%-*s", csv_output ? 0 : 25, perf_evsel__name(evsel));
 547
 548         if (evsel->cgrp)
 549                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
 550 }
 551
 552 static void printout(int id, int nr, struct perf_evsel *counter, double uval)
 553 {
 554         int cpu = cpu_map__id_to_cpu(id);
 555
 556         if (stat_config.aggr_mode == AGGR_GLOBAL)
 557                 cpu = 0;
 558
 559         if (nsec_counter(counter))
 560                 nsec_printout(id, nr, counter, uval);
 561         else
 562                 abs_printout(id, nr, counter, uval);
 563
 564         if (!csv_output && !stat_config.interval)
 565                 perf_stat__print_shadow_stats(stat_config.output, counter,
 566                                               uval, cpu,
 567                                               stat_config.aggr_mode);
 568 }
 569
 570 static void print_aggr(char *prefix)
 571 {
 572         FILE *output = stat_config.output;
 573         struct perf_evsel *counter;
 574         int cpu, s, s2, id, nr;
 575         double uval;
 576         u64 ena, run, val;
 577
 578         if (!(aggr_map || aggr_get_id))
 579                 return;
 580
 581         for (s = 0; s < aggr_map->nr; s++) {
 582                 id = aggr_map->map[s];
 583                 evlist__for_each(evsel_list, counter) {
 584                         val = ena = run = 0;
 585                         nr = 0;
 586                         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
 587                                 s2 = aggr_get_id(perf_evsel__cpus(counter), cpu);
 588                                 if (s2 != id)
 589                                         continue;
 590                                 val += perf_counts(counter->counts, cpu, 0)->val;
 591                                 ena += perf_counts(counter->counts, cpu, 0)->ena;
 592                                 run += perf_counts(counter->counts, cpu, 0)->run;
 593                                 nr++;
 594                         }
 595                         if (prefix)
 596                                 fprintf(output, "%s", prefix);
 597
 598                         if (run == 0 || ena == 0) {
 599                                 aggr_printout(counter, id, nr);
 600
 601                                 fprintf(output, "%*s%s",
 602                                         csv_output ? 0 : 18,
 603                                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 604                                         csv_sep);
 605
 606                                 fprintf(output, "%-*s%s",
 607                                         csv_output ? 0 : unit_width,
 608                                         counter->unit, csv_sep);
 609
 610                                 fprintf(output, "%*s",
 611                                         csv_output ? 0 : -25,
 612                                         perf_evsel__name(counter));
 613
 614                                 if (counter->cgrp)
 615                                         fprintf(output, "%s%s",
 616                                                 csv_sep, counter->cgrp->name);
 617
 618                                 print_running(run, ena);
 619                                 fputc('\n', output);
 620                                 continue;
 621                         }
 622                         uval = val * counter->scale;
 623                         printout(id, nr, counter, uval);
 624                         if (!csv_output)
 625                                 print_noise(counter, 1.0);
 626
 627                         print_running(run, ena);
 628                         fputc('\n', output);
 629                 }
 630         }
 631 }
 632
 633 static void print_aggr_thread(struct perf_evsel *counter, char *prefix)
 634 {
 635         FILE *output = stat_config.output;
 636         int nthreads = thread_map__nr(counter->threads);
 637         int ncpus = cpu_map__nr(counter->cpus);
 638         int cpu, thread;
 639         double uval;
 640
 641         for (thread = 0; thread < nthreads; thread++) {
 642                 u64 ena = 0, run = 0, val = 0;
 643
 644                 for (cpu = 0; cpu < ncpus; cpu++) {
 645                         val += perf_counts(counter->counts, cpu, thread)->val;
 646                         ena += perf_counts(counter->counts, cpu, thread)->ena;
 647                         run += perf_counts(counter->counts, cpu, thread)->run;
 648                 }
 649
 650                 if (prefix)
 651                         fprintf(output, "%s", prefix);
 652
 653                 uval = val * counter->scale;
 654                 printout(thread, 0, counter, uval);
 655
 656                 if (!csv_output)
 657                         print_noise(counter, 1.0);
 658
 659                 print_running(run, ena);
 660                 fputc('\n', output);
 661         }
 662 }
 663
 664 /*
 665  * Print out the results of a single counter:
 666  * aggregated counts in system-wide mode
 667  */
 668 static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
 669 {
 670         FILE *output = stat_config.output;
 671         struct perf_stat_evsel *ps = counter->priv;
 672         double avg = avg_stats(&ps->res_stats[0]);
 673         int scaled = counter->counts->scaled;
 674         double uval;
 675         double avg_enabled, avg_running;
 676
 677         avg_enabled = avg_stats(&ps->res_stats[1]);
 678         avg_running = avg_stats(&ps->res_stats[2]);
 679
 680         if (prefix)
 681                 fprintf(output, "%s", prefix);
 682
 683         if (scaled == -1 || !counter->supported) {
 684                 fprintf(output, "%*s%s",
 685                         csv_output ? 0 : 18,
 686                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 687                         csv_sep);
 688                 fprintf(output, "%-*s%s",
 689                         csv_output ? 0 : unit_width,
 690                         counter->unit, csv_sep);
 691                 fprintf(output, "%*s",
 692                         csv_output ? 0 : -25,
 693                         perf_evsel__name(counter));
 694
 695                 if (counter->cgrp)
 696                         fprintf(output, "%s%s", csv_sep, counter->cgrp->name);
 697
 698                 print_running(avg_running, avg_enabled);
 699                 fputc('\n', output);
 700                 return;
 701         }
 702
 703         uval = avg * counter->scale;
 704         printout(-1, 0, counter, uval);
 705
 706         print_noise(counter, avg);
 707
 708         print_running(avg_running, avg_enabled);
 709         fprintf(output, "\n");
 710 }
 711
 712 /*
 713  * Print out the results of a single counter:
 714  * does not use aggregated count in system-wide
 715  */
 716 static void print_counter(struct perf_evsel *counter, char *prefix)
 717 {
 718         FILE *output = stat_config.output;
 719         u64 ena, run, val;
 720         double uval;
 721         int cpu;
 722
 723         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
 724                 val = perf_counts(counter->counts, cpu, 0)->val;
 725                 ena = perf_counts(counter->counts, cpu, 0)->ena;
 726                 run = perf_counts(counter->counts, cpu, 0)->run;
 727
 728                 if (prefix)
 729                         fprintf(output, "%s", prefix);
 730
 731                 if (run == 0 || ena == 0) {
 732                         fprintf(output, "CPU%*d%s%*s%s",
 733                                 csv_output ? 0 : -4,
 734                                 perf_evsel__cpus(counter)->map[cpu], csv_sep,
 735                                 csv_output ? 0 : 18,
 736                                 counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 737                                 csv_sep);
 738
 739                                 fprintf(output, "%-*s%s",
 740                                         csv_output ? 0 : unit_width,
 741                                         counter->unit, csv_sep);
 742
 743                                 fprintf(output, "%*s",
 744                                         csv_output ? 0 : -25,
 745                                         perf_evsel__name(counter));
 746
 747                         if (counter->cgrp)
 748                                 fprintf(output, "%s%s",
 749                                         csv_sep, counter->cgrp->name);
 750
 751                         print_running(run, ena);
 752                         fputc('\n', output);
 753                         continue;
 754                 }
 755
 756                 uval = val * counter->scale;
 757                 printout(cpu, 0, counter, uval);
 758                 if (!csv_output)
 759                         print_noise(counter, 1.0);
 760                 print_running(run, ena);
 761
 762                 fputc('\n', output);
 763         }
 764 }
 765
 766 static void print_interval(char *prefix, struct timespec *ts)
 767 {
 768         FILE *output = stat_config.output;
 769         static int num_print_interval;
 770
 771         sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
 772
 773         if (num_print_interval == 0 && !csv_output) {
 774                 switch (stat_config.aggr_mode) {
 775                 case AGGR_SOCKET:
 776                         fprintf(output, "#           time socket cpus             counts %*s events\n", unit_width, "unit");
 777                         break;
 778                 case AGGR_CORE:
 779                         fprintf(output, "#           time core         cpus             counts %*s events\n", unit_width, "unit");
 780                         break;
 781                 case AGGR_NONE:
 782                         fprintf(output, "#           time CPU                counts %*s events\n", unit_width, "unit");
 783                         break;
 784                 case AGGR_THREAD:
 785                         fprintf(output, "#           time             comm-pid                  counts %*s events\n", unit_width, "unit");
 786                         break;
 787                 case AGGR_GLOBAL:
 788                 default:
 789                         fprintf(output, "#           time             counts %*s events\n", unit_width, "unit");
 790                 case AGGR_UNSET:
 791                         break;
 792                 }
 793         }
 794
 795         if (++num_print_interval == 25)
 796                 num_print_interval = 0;
 797 }
 798
 799 static void print_header(int argc, const char **argv)
 800 {
 801         FILE *output = stat_config.output;
 802         int i;
 803
 804         fflush(stdout);
 805
 806         if (!csv_output) {
 807                 fprintf(output, "\n");
 808                 fprintf(output, " Performance counter stats for ");
 809                 if (target.system_wide)
 810                         fprintf(output, "\'system wide");
 811                 else if (target.cpu_list)
 812                         fprintf(output, "\'CPU(s) %s", target.cpu_list);
 813                 else if (!target__has_task(&target)) {
 814                         fprintf(output, "\'%s", argv[0]);
 815                         for (i = 1; i < argc; i++)
 816                                 fprintf(output, " %s", argv[i]);
 817                 } else if (target.pid)
 818                         fprintf(output, "process id \'%s", target.pid);
 819                 else
 820                         fprintf(output, "thread id \'%s", target.tid);
 821
 822                 fprintf(output, "\'");
 823                 if (run_count > 1)
 824                         fprintf(output, " (%d runs)", run_count);
 825                 fprintf(output, ":\n\n");
 826         }
 827 }
 828
 829 static void print_footer(void)
 830 {
 831         FILE *output = stat_config.output;
 832
 833         if (!null_run)
 834                 fprintf(output, "\n");
 835         fprintf(output, " %17.9f seconds time elapsed",
 836                         avg_stats(&walltime_nsecs_stats)/1e9);
 837         if (run_count > 1) {
 838                 fprintf(output, "                                        ");
 839                 print_noise_pct(stddev_stats(&walltime_nsecs_stats),
 840                                 avg_stats(&walltime_nsecs_stats));
 841         }
 842         fprintf(output, "\n\n");
 843 }
 844
 845 static void print_counters(struct timespec *ts, int argc, const char **argv)
 846 {
 847         int interval = stat_config.interval;
 848         struct perf_evsel *counter;
 849         char buf[64], *prefix = NULL;
 850
 851         if (interval)
 852                 print_interval(prefix = buf, ts);
 853         else
 854                 print_header(argc, argv);
 855
 856         switch (stat_config.aggr_mode) {
 857         case AGGR_CORE:
 858         case AGGR_SOCKET:
 859                 print_aggr(prefix);
 860                 break;
 861         case AGGR_THREAD:
 862                 evlist__for_each(evsel_list, counter)
 863                         print_aggr_thread(counter, prefix);
 864                 break;
 865         case AGGR_GLOBAL:
 866                 evlist__for_each(evsel_list, counter)
 867                         print_counter_aggr(counter, prefix);
 868                 break;
 869         case AGGR_NONE:
 870                 evlist__for_each(evsel_list, counter)
 871                         print_counter(counter, prefix);
 872                 break;
 873         case AGGR_UNSET:
 874         default:
 875                 break;
 876         }
 877
 878         if (!interval && !csv_output)
 879                 print_footer();
 880
 881         fflush(stat_config.output);
 882 }
 883
 884 static volatile int signr = -1;
 885
 886 static void skip_signal(int signo)
 887 {
 888         if ((child_pid == -1) || stat_config.interval)
 889                 done = 1;
 890
 891         signr = signo;
 892         /*
 893          * render child_pid harmless
 894          * won't send SIGTERM to a random
 895          * process in case of race condition
 896          * and fast PID recycling
 897          */
 898         child_pid = -1;
 899 }
 900
 901 static void sig_atexit(void)
 902 {
 903         sigset_t set, oset;
 904
 905         /*
 906          * avoid race condition with SIGCHLD handler
 907          * in skip_signal() which is modifying child_pid
 908          * goal is to avoid send SIGTERM to a random
 909          * process
 910          */
 911         sigemptyset(&set);
 912         sigaddset(&set, SIGCHLD);
 913         sigprocmask(SIG_BLOCK, &set, &oset);
 914
 915         if (child_pid != -1)
 916                 kill(child_pid, SIGTERM);
 917
 918         sigprocmask(SIG_SETMASK, &oset, NULL);
 919
 920         if (signr == -1)
 921                 return;
 922
 923         signal(signr, SIG_DFL);
 924         kill(getpid(), signr);
 925 }
 926
 927 static int stat__set_big_num(const struct option *opt __maybe_unused,
 928                              const char *s __maybe_unused, int unset)
 929 {
 930         big_num_opt = unset ? 0 : 1;
 931         return 0;
 932 }
 933
 934 static const struct option stat_options[] = {
 935         OPT_BOOLEAN('T', "transaction", &transaction_run,
 936                     "hardware transaction statistics"),
 937         OPT_CALLBACK('e', "event", &evsel_list, "event",
 938                      "event selector. use 'perf list' to list available events",
 939                      parse_events_option),
 940         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
 941                      "event filter", parse_filter),
 942         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
 943                     "child tasks do not inherit counters"),
 944         OPT_STRING('p', "pid", &target.pid, "pid",
 945                    "stat events on existing process id"),
 946         OPT_STRING('t', "tid", &target.tid, "tid",
 947                    "stat events on existing thread id"),
 948         OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
 949                     "system-wide collection from all CPUs"),
 950         OPT_BOOLEAN('g', "group", &group,
 951                     "put the counters into a counter group"),
 952         OPT_BOOLEAN('c', "scale", &stat_config.scale, "scale/normalize counters"),
 953         OPT_INCR('v', "verbose", &verbose,
 954                     "be more verbose (show counter open errors, etc)"),
 955         OPT_INTEGER('r', "repeat", &run_count,
 956                     "repeat command and print average + stddev (max: 100, forever: 0)"),
 957         OPT_BOOLEAN('n', "null", &null_run,
 958                     "null run - dont start any counters"),
 959         OPT_INCR('d', "detailed", &detailed_run,
 960                     "detailed run - start a lot of events"),
 961         OPT_BOOLEAN('S', "sync", &sync_run,
 962                     "call sync() before starting a run"),
 963         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
 964                            "print large numbers with thousands\' separators",
 965                            stat__set_big_num),
 966         OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
 967                     "list of cpus to monitor in system-wide"),
 968         OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
 969                     "disable CPU count aggregation", AGGR_NONE),
 970         OPT_STRING('x', "field-separator", &csv_sep, "separator",
 971                    "print counts with custom separator"),
 972         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
 973                      "monitor event in cgroup name only", parse_cgroups),
 974         OPT_STRING('o', "output", &output_name, "file", "output file name"),
 975         OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
 976         OPT_INTEGER(0, "log-fd", &output_fd,
 977                     "log output to fd, instead of stderr"),
 978         OPT_STRING(0, "pre", &pre_cmd, "command",
 979                         "command to run prior to the measured command"),
 980         OPT_STRING(0, "post", &post_cmd, "command",
 981                         "command to run after to the measured command"),
 982         OPT_UINTEGER('I', "interval-print", &stat_config.interval,
 983                     "print counts at regular interval in ms (>= 10)"),
 984         OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
 985                      "aggregate counts per processor socket", AGGR_SOCKET),
 986         OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode,
 987                      "aggregate counts per physical processor core", AGGR_CORE),
 988         OPT_SET_UINT(0, "per-thread", &stat_config.aggr_mode,
 989                      "aggregate counts per thread", AGGR_THREAD),
 990         OPT_UINTEGER('D', "delay", &initial_delay,
 991                      "ms to wait before starting measurement after program start"),
 992         OPT_END()
 993 };
 994
 995 static int perf_stat__get_socket(struct cpu_map *map, int cpu)
 996 {
 997         return cpu_map__get_socket(map, cpu, NULL);
 998 }
 999
1000 static int perf_stat__get_core(struct cpu_map *map, int cpu)
1001 {
1002         return cpu_map__get_core(map, cpu, NULL);
1003 }
1004
1005 static int cpu_map__get_max(struct cpu_map *map)
1006 {
1007         int i, max = -1;
1008
1009         for (i = 0; i < map->nr; i++) {
1010                 if (map->map[i] > max)
1011                         max = map->map[i];
1012         }
1013
1014         return max;
1015 }
1016
1017 static struct cpu_map *cpus_aggr_map;
1018
1019 static int perf_stat__get_aggr(aggr_get_id_t get_id, struct cpu_map *map, int idx)
1020 {
1021         int cpu;
1022
1023         if (idx >= map->nr)
1024                 return -1;
1025
1026         cpu = map->map[idx];
1027
1028         if (cpus_aggr_map->map[cpu] == -1)
1029                 cpus_aggr_map->map[cpu] = get_id(map, idx);
1030
1031         return cpus_aggr_map->map[cpu];
1032 }
1033
1034 static int perf_stat__get_socket_cached(struct cpu_map *map, int idx)
1035 {
1036         return perf_stat__get_aggr(perf_stat__get_socket, map, idx);
1037 }
1038
1039 static int perf_stat__get_core_cached(struct cpu_map *map, int idx)
1040 {
1041         return perf_stat__get_aggr(perf_stat__get_core, map, idx);
1042 }
1043
1044 static int perf_stat_init_aggr_mode(void)
1045 {
1046         int nr;
1047
1048         switch (stat_config.aggr_mode) {
1049         case AGGR_SOCKET:
1050                 if (cpu_map__build_socket_map(evsel_list->cpus, &aggr_map)) {
1051                         perror("cannot build socket map");
1052                         return -1;
1053                 }
1054                 aggr_get_id = perf_stat__get_socket_cached;
1055                 break;
1056         case AGGR_CORE:
1057                 if (cpu_map__build_core_map(evsel_list->cpus, &aggr_map)) {
1058                         perror("cannot build core map");
1059                         return -1;
1060                 }
1061                 aggr_get_id = perf_stat__get_core_cached;
1062                 break;
1063         case AGGR_NONE:
1064         case AGGR_GLOBAL:
1065         case AGGR_THREAD:
1066         case AGGR_UNSET:
1067         default:
1068                 break;
1069         }
1070
1071         /*
1072          * The evsel_list->cpus is the base we operate on,
1073          * taking the highest cpu number to be the size of
1074          * the aggregation translate cpumap.
1075          */
1076         nr = cpu_map__get_max(evsel_list->cpus);
1077         cpus_aggr_map = cpu_map__empty_new(nr + 1);
1078         return cpus_aggr_map ? 0 : -ENOMEM;
1079 }
1080
1081 /*
1082  * Add default attributes, if there were no attributes specified or
1083  * if -d/--detailed, -d -d or -d -d -d is used:
1084  */
1085 static int add_default_attributes(void)
1086 {
1087         struct perf_event_attr default_attrs[] = {
1088
1089   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
1090   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
1091   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
1092   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
1093
1094   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
1095   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
1096   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
1097   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
1098   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
1099   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
1100
1101 };
1102
1103 /*
1104  * Detailed stats (-d), covering the L1 and last level data caches:
1105  */
1106         struct perf_event_attr detailed_attrs[] = {
1107
1108   { .type = PERF_TYPE_HW_CACHE,
1109     .config =
1110          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1111         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1112         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1113
1114   { .type = PERF_TYPE_HW_CACHE,
1115     .config =
1116          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1117         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1118         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1119
1120   { .type = PERF_TYPE_HW_CACHE,
1121     .config =
1122          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1123         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1124         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1125
1126   { .type = PERF_TYPE_HW_CACHE,
1127     .config =
1128          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1129         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1130         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1131 };
1132
1133 /*
1134  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
1135  */
1136         struct perf_event_attr very_detailed_attrs[] = {
1137
1138   { .type = PERF_TYPE_HW_CACHE,
1139     .config =
1140          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1141         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1142         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1143
1144   { .type = PERF_TYPE_HW_CACHE,
1145     .config =
1146          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1147         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1148         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1149
1150   { .type = PERF_TYPE_HW_CACHE,
1151     .config =
1152          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1153         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1154         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1155
1156   { .type = PERF_TYPE_HW_CACHE,
1157     .config =
1158          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1159         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1160         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1161
1162   { .type = PERF_TYPE_HW_CACHE,
1163     .config =
1164          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1165         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1166         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1167
1168   { .type = PERF_TYPE_HW_CACHE,
1169     .config =
1170          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1171         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1172         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1173
1174 };
1175
1176 /*
1177  * Very, very detailed stats (-d -d -d), adding prefetch events:
1178  */
1179         struct perf_event_attr very_very_detailed_attrs[] = {
1180
1181   { .type = PERF_TYPE_HW_CACHE,
1182     .config =
1183          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1184         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1185         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1186
1187   { .type = PERF_TYPE_HW_CACHE,
1188     .config =
1189          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1190         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1191         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1192 };
1193
1194         /* Set attrs if no event is selected and !null_run: */
1195         if (null_run)
1196                 return 0;
1197
1198         if (transaction_run) {
1199                 int err;
1200                 if (pmu_have_event("cpu", "cycles-ct") &&
1201                     pmu_have_event("cpu", "el-start"))
1202                         err = parse_events(evsel_list, transaction_attrs, NULL);
1203                 else
1204                         err = parse_events(evsel_list, transaction_limited_attrs, NULL);
1205                 if (err) {
1206                         fprintf(stderr, "Cannot set up transaction events\n");
1207                         return -1;
1208                 }
1209                 return 0;
1210         }
1211
1212         if (!evsel_list->nr_entries) {
1213                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs) < 0)
1214                         return -1;
1215         }
1216
1217         /* Detailed events get appended to the event list: */
1218
1219         if (detailed_run <  1)
1220                 return 0;
1221
1222         /* Append detailed run extra attributes: */
1223         if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
1224                 return -1;
1225
1226         if (detailed_run < 2)
1227                 return 0;
1228
1229         /* Append very detailed run extra attributes: */
1230         if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
1231                 return -1;
1232
1233         if (detailed_run < 3)
1234                 return 0;
1235
1236         /* Append very, very detailed run extra attributes: */
1237         return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
1238 }
1239
1240 int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
1241 {
1242         const char * const stat_usage[] = {
1243                 "perf stat [<options>] [<command>]",
1244                 NULL
1245         };
1246         int status = -EINVAL, run_idx;
1247         const char *mode;
1248         FILE *output = stderr;
1249         unsigned int interval;
1250
1251         setlocale(LC_ALL, "");
1252
1253         evsel_list = perf_evlist__new();
1254         if (evsel_list == NULL)
1255                 return -ENOMEM;
1256
1257         argc = parse_options(argc, argv, stat_options, stat_usage,
1258                 PARSE_OPT_STOP_AT_NON_OPTION);
1259
1260         interval = stat_config.interval;
1261
1262         if (output_name && strcmp(output_name, "-"))
1263                 output = NULL;
1264
1265         if (output_name && output_fd) {
1266                 fprintf(stderr, "cannot use both --output and --log-fd\n");
1267                 parse_options_usage(stat_usage, stat_options, "o", 1);
1268                 parse_options_usage(NULL, stat_options, "log-fd", 0);
1269                 goto out;
1270         }
1271
1272         if (output_fd < 0) {
1273                 fprintf(stderr, "argument to --log-fd must be a > 0\n");
1274                 parse_options_usage(stat_usage, stat_options, "log-fd", 0);
1275                 goto out;
1276         }
1277
1278         if (!output) {
1279                 struct timespec tm;
1280                 mode = append_file ? "a" : "w";
1281
1282                 output = fopen(output_name, mode);
1283                 if (!output) {
1284                         perror("failed to create output file");
1285                         return -1;
1286                 }
1287                 clock_gettime(CLOCK_REALTIME, &tm);
1288                 fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
1289         } else if (output_fd > 0) {
1290                 mode = append_file ? "a" : "w";
1291                 output = fdopen(output_fd, mode);
1292                 if (!output) {
1293                         perror("Failed opening logfd");
1294                         return -errno;
1295                 }
1296         }
1297
1298         stat_config.output = output;
1299
1300         if (csv_sep) {
1301                 csv_output = true;
1302                 if (!strcmp(csv_sep, "\\t"))
1303                         csv_sep = "\t";
1304         } else
1305                 csv_sep = DEFAULT_SEPARATOR;
1306
1307         /*
1308          * let the spreadsheet do the pretty-printing
1309          */
1310         if (csv_output) {
1311                 /* User explicitly passed -B? */
1312                 if (big_num_opt == 1) {
1313                         fprintf(stderr, "-B option not supported with -x\n");
1314                         parse_options_usage(stat_usage, stat_options, "B", 1);
1315                         parse_options_usage(NULL, stat_options, "x", 1);
1316                         goto out;
1317                 } else /* Nope, so disable big number formatting */
1318                         big_num = false;
1319         } else if (big_num_opt == 0) /* User passed --no-big-num */
1320                 big_num = false;
1321
1322         if (!argc && target__none(&target))
1323                 usage_with_options(stat_usage, stat_options);
1324
1325         if (run_count < 0) {
1326                 pr_err("Run count must be a positive number\n");
1327                 parse_options_usage(stat_usage, stat_options, "r", 1);
1328                 goto out;
1329         } else if (run_count == 0) {
1330                 forever = true;
1331                 run_count = 1;
1332         }
1333
1334         if ((stat_config.aggr_mode == AGGR_THREAD) && !target__has_task(&target)) {
1335                 fprintf(stderr, "The --per-thread option is only available "
1336                         "when monitoring via -p -t options.\n");
1337                 parse_options_usage(NULL, stat_options, "p", 1);
1338                 parse_options_usage(NULL, stat_options, "t", 1);
1339                 goto out;
1340         }
1341
1342         /*
1343          * no_aggr, cgroup are for system-wide only
1344          * --per-thread is aggregated per thread, we dont mix it with cpu mode
1345          */
1346         if (((stat_config.aggr_mode != AGGR_GLOBAL &&
1347               stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
1348             !target__has_cpu(&target)) {
1349                 fprintf(stderr, "both cgroup and no-aggregation "
1350                         "modes only available in system-wide mode\n");
1351
1352                 parse_options_usage(stat_usage, stat_options, "G", 1);
1353                 parse_options_usage(NULL, stat_options, "A", 1);
1354                 parse_options_usage(NULL, stat_options, "a", 1);
1355                 goto out;
1356         }
1357
1358         if (add_default_attributes())
1359                 goto out;
1360
1361         target__validate(&target);
1362
1363         if (perf_evlist__create_maps(evsel_list, &target) < 0) {
1364                 if (target__has_task(&target)) {
1365                         pr_err("Problems finding threads of monitor\n");
1366                         parse_options_usage(stat_usage, stat_options, "p", 1);
1367                         parse_options_usage(NULL, stat_options, "t", 1);
1368                 } else if (target__has_cpu(&target)) {
1369                         perror("failed to parse CPUs map");
1370                         parse_options_usage(stat_usage, stat_options, "C", 1);
1371                         parse_options_usage(NULL, stat_options, "a", 1);
1372                 }
1373                 goto out;
1374         }
1375
1376         /*
1377          * Initialize thread_map with comm names,
1378          * so we could print it out on output.
1379          */
1380         if (stat_config.aggr_mode == AGGR_THREAD)
1381                 thread_map__read_comms(evsel_list->threads);
1382
1383         if (interval && interval < 100) {
1384                 if (interval < 10) {
1385                         pr_err("print interval must be >= 10ms\n");
1386                         parse_options_usage(stat_usage, stat_options, "I", 1);
1387                         goto out;
1388                 } else
1389                         pr_warning("print interval < 100ms. "
1390                                    "The overhead percentage could be high in some cases. "
1391                                    "Please proceed with caution.\n");
1392         }
1393
1394         if (perf_evlist__alloc_stats(evsel_list, interval))
1395                 goto out;
1396
1397         if (perf_stat_init_aggr_mode())
1398                 goto out;
1399
1400         /*
1401          * We dont want to block the signals - that would cause
1402          * child tasks to inherit that and Ctrl-C would not work.
1403          * What we want is for Ctrl-C to work in the exec()-ed
1404          * task, but being ignored by perf stat itself:
1405          */
1406         atexit(sig_atexit);
1407         if (!forever)
1408                 signal(SIGINT,  skip_signal);
1409         signal(SIGCHLD, skip_signal);
1410         signal(SIGALRM, skip_signal);
1411         signal(SIGABRT, skip_signal);
1412
1413         status = 0;
1414         for (run_idx = 0; forever || run_idx < run_count; run_idx++) {
1415                 if (run_count != 1 && verbose)
1416                         fprintf(output, "[ perf stat: executing run #%d ... ]\n",
1417                                 run_idx + 1);
1418
1419                 status = run_perf_stat(argc, argv);
1420                 if (forever && status != -1) {
1421                         print_counters(NULL, argc, argv);
1422                         perf_stat__reset_stats();
1423                 }
1424         }
1425
1426         if (!forever && status != -1 && !interval)
1427                 print_counters(NULL, argc, argv);
1428
1429         perf_evlist__free_stats(evsel_list);
1430 out:
1431         perf_evlist__delete(evsel_list);
1432         return status;
1433 }