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/util.h"
  47 #include "util/parse-options.h"
  48 #include "util/parse-events.h"
  49 #include "util/event.h"
  50 #include "util/evlist.h"
  51 #include "util/evsel.h"
  52 #include "util/debug.h"
  53 #include "util/color.h"
  54 #include "util/stat.h"
  55 #include "util/header.h"
  56 #include "util/cpumap.h"
  57 #include "util/thread.h"
  58 #include "util/thread_map.h"
  59
  60 #include <sys/prctl.h>
  61 #include <locale.h>
  62
  63 #define DEFAULT_SEPARATOR       " "
  64 #define CNTR_NOT_SUPPORTED      "<not supported>"
  65 #define CNTR_NOT_COUNTED        "<not counted>"
  66
  67 static struct perf_event_attr default_attrs[] = {
  68
  69   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
  70   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
  71   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
  72   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
  73
  74   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
  75   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
  76   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
  77   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
  78   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
  79   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
  80
  81 };
  82
  83 /*
  84  * Detailed stats (-d), covering the L1 and last level data caches:
  85  */
  86 static struct perf_event_attr detailed_attrs[] = {
  87
  88   { .type = PERF_TYPE_HW_CACHE,
  89     .config =
  90          PERF_COUNT_HW_CACHE_L1D                <<  0  |
  91         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
  92         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
  93
  94   { .type = PERF_TYPE_HW_CACHE,
  95     .config =
  96          PERF_COUNT_HW_CACHE_L1D                <<  0  |
  97         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
  98         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
  99
 100   { .type = PERF_TYPE_HW_CACHE,
 101     .config =
 102          PERF_COUNT_HW_CACHE_LL                 <<  0  |
 103         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 104         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
 105
 106   { .type = PERF_TYPE_HW_CACHE,
 107     .config =
 108          PERF_COUNT_HW_CACHE_LL                 <<  0  |
 109         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 110         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
 111 };
 112
 113 /*
 114  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
 115  */
 116 static struct perf_event_attr very_detailed_attrs[] = {
 117
 118   { .type = PERF_TYPE_HW_CACHE,
 119     .config =
 120          PERF_COUNT_HW_CACHE_L1I                <<  0  |
 121         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 122         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
 123
 124   { .type = PERF_TYPE_HW_CACHE,
 125     .config =
 126          PERF_COUNT_HW_CACHE_L1I                <<  0  |
 127         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 128         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
 129
 130   { .type = PERF_TYPE_HW_CACHE,
 131     .config =
 132          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
 133         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 134         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
 135
 136   { .type = PERF_TYPE_HW_CACHE,
 137     .config =
 138          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
 139         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 140         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
 141
 142   { .type = PERF_TYPE_HW_CACHE,
 143     .config =
 144          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
 145         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 146         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
 147
 148   { .type = PERF_TYPE_HW_CACHE,
 149     .config =
 150          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
 151         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
 152         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
 153
 154 };
 155
 156 /*
 157  * Very, very detailed stats (-d -d -d), adding prefetch events:
 158  */
 159 static struct perf_event_attr very_very_detailed_attrs[] = {
 160
 161   { .type = PERF_TYPE_HW_CACHE,
 162     .config =
 163          PERF_COUNT_HW_CACHE_L1D                <<  0  |
 164         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
 165         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
 166
 167   { .type = PERF_TYPE_HW_CACHE,
 168     .config =
 169          PERF_COUNT_HW_CACHE_L1D                <<  0  |
 170         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
 171         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
 172 };
 173
 174
 175
 176 static struct perf_evlist       *evsel_list;
 177
 178 static struct perf_target       target = {
 179         .uid    = UINT_MAX,
 180 };
 181
 182 static int                      run_idx                         =  0;
 183 static int                      run_count                       =  1;
 184 static bool                     no_inherit                      = false;
 185 static bool                     scale                           =  true;
 186 static bool                     no_aggr                         = false;
 187 static pid_t                    child_pid                       = -1;
 188 static bool                     null_run                        =  false;
 189 static int                      detailed_run                    =  0;
 190 static bool                     sync_run                        =  false;
 191 static bool                     big_num                         =  true;
 192 static int                      big_num_opt                     =  -1;
 193 static const char               *csv_sep                        = NULL;
 194 static bool                     csv_output                      = false;
 195 static bool                     group                           = false;
 196 static const char               *output_name                    = NULL;
 197 static FILE                     *output                         = NULL;
 198 static int                      output_fd;
 199
 200 static volatile int done = 0;
 201
 202 struct perf_stat {
 203         struct stats      res_stats[3];
 204 };
 205
 206 static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
 207 {
 208         evsel->priv = zalloc(sizeof(struct perf_stat));
 209         return evsel->priv == NULL ? -ENOMEM : 0;
 210 }
 211
 212 static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
 213 {
 214         free(evsel->priv);
 215         evsel->priv = NULL;
 216 }
 217
 218 static struct stats runtime_nsecs_stats[MAX_NR_CPUS];
 219 static struct stats runtime_cycles_stats[MAX_NR_CPUS];
 220 static struct stats runtime_stalled_cycles_front_stats[MAX_NR_CPUS];
 221 static struct stats runtime_stalled_cycles_back_stats[MAX_NR_CPUS];
 222 static struct stats runtime_branches_stats[MAX_NR_CPUS];
 223 static struct stats runtime_cacherefs_stats[MAX_NR_CPUS];
 224 static struct stats runtime_l1_dcache_stats[MAX_NR_CPUS];
 225 static struct stats runtime_l1_icache_stats[MAX_NR_CPUS];
 226 static struct stats runtime_ll_cache_stats[MAX_NR_CPUS];
 227 static struct stats runtime_itlb_cache_stats[MAX_NR_CPUS];
 228 static struct stats runtime_dtlb_cache_stats[MAX_NR_CPUS];
 229 static struct stats walltime_nsecs_stats;
 230
 231 static int create_perf_stat_counter(struct perf_evsel *evsel,
 232                                     struct perf_evsel *first)
 233 {
 234         struct perf_event_attr *attr = &evsel->attr;
 235         bool exclude_guest_missing = false;
 236         int ret;
 237
 238         if (scale)
 239                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 240                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 241
 242         attr->inherit = !no_inherit;
 243
 244 retry:
 245         if (exclude_guest_missing)
 246                 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
 247
 248         if (perf_target__has_cpu(&target)) {
 249                 ret = perf_evsel__open_per_cpu(evsel, evsel_list->cpus);
 250                 if (ret)
 251                         goto check_ret;
 252                 return 0;
 253         }
 254
 255         if (!perf_target__has_task(&target) && (!group || evsel == first)) {
 256                 attr->disabled = 1;
 257                 attr->enable_on_exec = 1;
 258         }
 259
 260         ret = perf_evsel__open_per_thread(evsel, evsel_list->threads);
 261         if (!ret)
 262                 return 0;
 263         /* fall through */
 264 check_ret:
 265         if (ret && errno == EINVAL) {
 266                 if (!exclude_guest_missing &&
 267                     (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
 268                         pr_debug("Old kernel, cannot exclude "
 269                                  "guest or host samples.\n");
 270                         exclude_guest_missing = true;
 271                         goto retry;
 272                 }
 273         }
 274         return ret;
 275 }
 276
 277 /*
 278  * Does the counter have nsecs as a unit?
 279  */
 280 static inline int nsec_counter(struct perf_evsel *evsel)
 281 {
 282         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
 283             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 284                 return 1;
 285
 286         return 0;
 287 }
 288
 289 /*
 290  * Update various tracking values we maintain to print
 291  * more semantic information such as miss/hit ratios,
 292  * instruction rates, etc:
 293  */
 294 static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
 295 {
 296         if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
 297                 update_stats(&runtime_nsecs_stats[0], count[0]);
 298         else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
 299                 update_stats(&runtime_cycles_stats[0], count[0]);
 300         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
 301                 update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
 302         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_BACKEND))
 303                 update_stats(&runtime_stalled_cycles_back_stats[0], count[0]);
 304         else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
 305                 update_stats(&runtime_branches_stats[0], count[0]);
 306         else if (perf_evsel__match(counter, HARDWARE, HW_CACHE_REFERENCES))
 307                 update_stats(&runtime_cacherefs_stats[0], count[0]);
 308         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1D))
 309                 update_stats(&runtime_l1_dcache_stats[0], count[0]);
 310         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1I))
 311                 update_stats(&runtime_l1_icache_stats[0], count[0]);
 312         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_LL))
 313                 update_stats(&runtime_ll_cache_stats[0], count[0]);
 314         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_DTLB))
 315                 update_stats(&runtime_dtlb_cache_stats[0], count[0]);
 316         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_ITLB))
 317                 update_stats(&runtime_itlb_cache_stats[0], count[0]);
 318 }
 319
 320 /*
 321  * Read out the results of a single counter:
 322  * aggregate counts across CPUs in system-wide mode
 323  */
 324 static int read_counter_aggr(struct perf_evsel *counter)
 325 {
 326         struct perf_stat *ps = counter->priv;
 327         u64 *count = counter->counts->aggr.values;
 328         int i;
 329
 330         if (__perf_evsel__read(counter, evsel_list->cpus->nr,
 331                                evsel_list->threads->nr, scale) < 0)
 332                 return -1;
 333
 334         for (i = 0; i < 3; i++)
 335                 update_stats(&ps->res_stats[i], count[i]);
 336
 337         if (verbose) {
 338                 fprintf(output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 339                         perf_evsel__name(counter), count[0], count[1], count[2]);
 340         }
 341
 342         /*
 343          * Save the full runtime - to allow normalization during printout:
 344          */
 345         update_shadow_stats(counter, count);
 346
 347         return 0;
 348 }
 349
 350 /*
 351  * Read out the results of a single counter:
 352  * do not aggregate counts across CPUs in system-wide mode
 353  */
 354 static int read_counter(struct perf_evsel *counter)
 355 {
 356         u64 *count;
 357         int cpu;
 358
 359         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 360                 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
 361                         return -1;
 362
 363                 count = counter->counts->cpu[cpu].values;
 364
 365                 update_shadow_stats(counter, count);
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int run_perf_stat(int argc __maybe_unused, const char **argv)
 372 {
 373         unsigned long long t0, t1;
 374         struct perf_evsel *counter, *first;
 375         int status = 0;
 376         int child_ready_pipe[2], go_pipe[2];
 377         const bool forks = (argc > 0);
 378         char buf;
 379
 380         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 381                 perror("failed to create pipes");
 382                 return -1;
 383         }
 384
 385         if (forks) {
 386                 if ((child_pid = fork()) < 0)
 387                         perror("failed to fork");
 388
 389                 if (!child_pid) {
 390                         close(child_ready_pipe[0]);
 391                         close(go_pipe[1]);
 392                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 393
 394                         /*
 395                          * Do a dummy execvp to get the PLT entry resolved,
 396                          * so we avoid the resolver overhead on the real
 397                          * execvp call.
 398                          */
 399                         execvp("", (char **)argv);
 400
 401                         /*
 402                          * Tell the parent we're ready to go
 403                          */
 404                         close(child_ready_pipe[1]);
 405
 406                         /*
 407                          * Wait until the parent tells us to go.
 408                          */
 409                         if (read(go_pipe[0], &buf, 1) == -1)
 410                                 perror("unable to read pipe");
 411
 412                         execvp(argv[0], (char **)argv);
 413
 414                         perror(argv[0]);
 415                         exit(-1);
 416                 }
 417
 418                 if (perf_target__none(&target))
 419                         evsel_list->threads->map[0] = child_pid;
 420
 421                 /*
 422                  * Wait for the child to be ready to exec.
 423                  */
 424                 close(child_ready_pipe[1]);
 425                 close(go_pipe[0]);
 426                 if (read(child_ready_pipe[0], &buf, 1) == -1)
 427                         perror("unable to read pipe");
 428                 close(child_ready_pipe[0]);
 429         }
 430
 431         if (group)
 432                 perf_evlist__set_leader(evsel_list);
 433
 434         first = perf_evlist__first(evsel_list);
 435
 436         list_for_each_entry(counter, &evsel_list->entries, node) {
 437                 if (create_perf_stat_counter(counter, first) < 0) {
 438                         /*
 439                          * PPC returns ENXIO for HW counters until 2.6.37
 440                          * (behavior changed with commit b0a873e).
 441                          */
 442                         if (errno == EINVAL || errno == ENOSYS ||
 443                             errno == ENOENT || errno == EOPNOTSUPP ||
 444                             errno == ENXIO) {
 445                                 if (verbose)
 446                                         ui__warning("%s event is not supported by the kernel.\n",
 447                                                     perf_evsel__name(counter));
 448                                 counter->supported = false;
 449                                 continue;
 450                         }
 451
 452                         if (errno == EPERM || errno == EACCES) {
 453                                 error("You may not have permission to collect %sstats.\n"
 454                                       "\t Consider tweaking"
 455                                       " /proc/sys/kernel/perf_event_paranoid or running as root.",
 456                                       target.system_wide ? "system-wide " : "");
 457                         } else {
 458                                 error("open_counter returned with %d (%s). "
 459                                       "/bin/dmesg may provide additional information.\n",
 460                                        errno, strerror(errno));
 461                         }
 462                         if (child_pid != -1)
 463                                 kill(child_pid, SIGTERM);
 464
 465                         pr_err("Not all events could be opened.\n");
 466                         return -1;
 467                 }
 468                 counter->supported = true;
 469         }
 470
 471         if (perf_evlist__set_filters(evsel_list)) {
 472                 error("failed to set filter with %d (%s)\n", errno,
 473                         strerror(errno));
 474                 return -1;
 475         }
 476
 477         /*
 478          * Enable counters and exec the command:
 479          */
 480         t0 = rdclock();
 481
 482         if (forks) {
 483                 close(go_pipe[1]);
 484                 wait(&status);
 485                 if (WIFSIGNALED(status))
 486                         psignal(WTERMSIG(status), argv[0]);
 487         } else {
 488                 while(!done) sleep(1);
 489         }
 490
 491         t1 = rdclock();
 492
 493         update_stats(&walltime_nsecs_stats, t1 - t0);
 494
 495         if (no_aggr) {
 496                 list_for_each_entry(counter, &evsel_list->entries, node) {
 497                         read_counter(counter);
 498                         perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
 499                 }
 500         } else {
 501                 list_for_each_entry(counter, &evsel_list->entries, node) {
 502                         read_counter_aggr(counter);
 503                         perf_evsel__close_fd(counter, evsel_list->cpus->nr,
 504                                              evsel_list->threads->nr);
 505                 }
 506         }
 507
 508         return WEXITSTATUS(status);
 509 }
 510
 511 static void print_noise_pct(double total, double avg)
 512 {
 513         double pct = rel_stddev_stats(total, avg);
 514
 515         if (csv_output)
 516                 fprintf(output, "%s%.2f%%", csv_sep, pct);
 517         else if (pct)
 518                 fprintf(output, "  ( +-%6.2f%% )", pct);
 519 }
 520
 521 static void print_noise(struct perf_evsel *evsel, double avg)
 522 {
 523         struct perf_stat *ps;
 524
 525         if (run_count == 1)
 526                 return;
 527
 528         ps = evsel->priv;
 529         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
 530 }
 531
 532 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
 533 {
 534         double msecs = avg / 1e6;
 535         char cpustr[16] = { '\0', };
 536         const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-25s";
 537
 538         if (no_aggr)
 539                 sprintf(cpustr, "CPU%*d%s",
 540                         csv_output ? 0 : -4,
 541                         evsel_list->cpus->map[cpu], csv_sep);
 542
 543         fprintf(output, fmt, cpustr, msecs, csv_sep, perf_evsel__name(evsel));
 544
 545         if (evsel->cgrp)
 546                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
 547
 548         if (csv_output)
 549                 return;
 550
 551         if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 552                 fprintf(output, " # %8.3f CPUs utilized          ",
 553                         avg / avg_stats(&walltime_nsecs_stats));
 554         else
 555                 fprintf(output, "                                   ");
 556 }
 557
 558 /* used for get_ratio_color() */
 559 enum grc_type {
 560         GRC_STALLED_CYCLES_FE,
 561         GRC_STALLED_CYCLES_BE,
 562         GRC_CACHE_MISSES,
 563         GRC_MAX_NR
 564 };
 565
 566 static const char *get_ratio_color(enum grc_type type, double ratio)
 567 {
 568         static const double grc_table[GRC_MAX_NR][3] = {
 569                 [GRC_STALLED_CYCLES_FE] = { 50.0, 30.0, 10.0 },
 570                 [GRC_STALLED_CYCLES_BE] = { 75.0, 50.0, 20.0 },
 571                 [GRC_CACHE_MISSES]      = { 20.0, 10.0, 5.0 },
 572         };
 573         const char *color = PERF_COLOR_NORMAL;
 574
 575         if (ratio > grc_table[type][0])
 576                 color = PERF_COLOR_RED;
 577         else if (ratio > grc_table[type][1])
 578                 color = PERF_COLOR_MAGENTA;
 579         else if (ratio > grc_table[type][2])
 580                 color = PERF_COLOR_YELLOW;
 581
 582         return color;
 583 }
 584
 585 static void print_stalled_cycles_frontend(int cpu,
 586                                           struct perf_evsel *evsel
 587                                           __maybe_unused, double avg)
 588 {
 589         double total, ratio = 0.0;
 590         const char *color;
 591
 592         total = avg_stats(&runtime_cycles_stats[cpu]);
 593
 594         if (total)
 595                 ratio = avg / total * 100.0;
 596
 597         color = get_ratio_color(GRC_STALLED_CYCLES_FE, ratio);
 598
 599         fprintf(output, " #  ");
 600         color_fprintf(output, color, "%6.2f%%", ratio);
 601         fprintf(output, " frontend cycles idle   ");
 602 }
 603
 604 static void print_stalled_cycles_backend(int cpu,
 605                                          struct perf_evsel *evsel
 606                                          __maybe_unused, double avg)
 607 {
 608         double total, ratio = 0.0;
 609         const char *color;
 610
 611         total = avg_stats(&runtime_cycles_stats[cpu]);
 612
 613         if (total)
 614                 ratio = avg / total * 100.0;
 615
 616         color = get_ratio_color(GRC_STALLED_CYCLES_BE, ratio);
 617
 618         fprintf(output, " #  ");
 619         color_fprintf(output, color, "%6.2f%%", ratio);
 620         fprintf(output, " backend  cycles idle   ");
 621 }
 622
 623 static void print_branch_misses(int cpu,
 624                                 struct perf_evsel *evsel __maybe_unused,
 625                                 double avg)
 626 {
 627         double total, ratio = 0.0;
 628         const char *color;
 629
 630         total = avg_stats(&runtime_branches_stats[cpu]);
 631
 632         if (total)
 633                 ratio = avg / total * 100.0;
 634
 635         color = get_ratio_color(GRC_CACHE_MISSES, ratio);
 636
 637         fprintf(output, " #  ");
 638         color_fprintf(output, color, "%6.2f%%", ratio);
 639         fprintf(output, " of all branches        ");
 640 }
 641
 642 static void print_l1_dcache_misses(int cpu,
 643                                    struct perf_evsel *evsel __maybe_unused,
 644                                    double avg)
 645 {
 646         double total, ratio = 0.0;
 647         const char *color;
 648
 649         total = avg_stats(&runtime_l1_dcache_stats[cpu]);
 650
 651         if (total)
 652                 ratio = avg / total * 100.0;
 653
 654         color = get_ratio_color(GRC_CACHE_MISSES, ratio);
 655
 656         fprintf(output, " #  ");
 657         color_fprintf(output, color, "%6.2f%%", ratio);
 658         fprintf(output, " of all L1-dcache hits  ");
 659 }
 660
 661 static void print_l1_icache_misses(int cpu,
 662                                    struct perf_evsel *evsel __maybe_unused,
 663                                    double avg)
 664 {
 665         double total, ratio = 0.0;
 666         const char *color;
 667
 668         total = avg_stats(&runtime_l1_icache_stats[cpu]);
 669
 670         if (total)
 671                 ratio = avg / total * 100.0;
 672
 673         color = get_ratio_color(GRC_CACHE_MISSES, ratio);
 674
 675         fprintf(output, " #  ");
 676         color_fprintf(output, color, "%6.2f%%", ratio);
 677         fprintf(output, " of all L1-icache hits  ");
 678 }
 679
 680 static void print_dtlb_cache_misses(int cpu,
 681                                     struct perf_evsel *evsel __maybe_unused,
 682                                     double avg)
 683 {
 684         double total, ratio = 0.0;
 685         const char *color;
 686
 687         total = avg_stats(&runtime_dtlb_cache_stats[cpu]);
 688
 689         if (total)
 690                 ratio = avg / total * 100.0;
 691
 692         color = get_ratio_color(GRC_CACHE_MISSES, ratio);
 693
 694         fprintf(output, " #  ");
 695         color_fprintf(output, color, "%6.2f%%", ratio);
 696         fprintf(output, " of all dTLB cache hits ");
 697 }
 698
 699 static void print_itlb_cache_misses(int cpu,
 700                                     struct perf_evsel *evsel __maybe_unused,
 701                                     double avg)
 702 {
 703         double total, ratio = 0.0;
 704         const char *color;
 705
 706         total = avg_stats(&runtime_itlb_cache_stats[cpu]);
 707
 708         if (total)
 709                 ratio = avg / total * 100.0;
 710
 711         color = get_ratio_color(GRC_CACHE_MISSES, ratio);
 712
 713         fprintf(output, " #  ");
 714         color_fprintf(output, color, "%6.2f%%", ratio);
 715         fprintf(output, " of all iTLB cache hits ");
 716 }
 717
 718 static void print_ll_cache_misses(int cpu,
 719                                   struct perf_evsel *evsel __maybe_unused,
 720                                   double avg)
 721 {
 722         double total, ratio = 0.0;
 723         const char *color;
 724
 725         total = avg_stats(&runtime_ll_cache_stats[cpu]);
 726
 727         if (total)
 728                 ratio = avg / total * 100.0;
 729
 730         color = get_ratio_color(GRC_CACHE_MISSES, ratio);
 731
 732         fprintf(output, " #  ");
 733         color_fprintf(output, color, "%6.2f%%", ratio);
 734         fprintf(output, " of all LL-cache hits   ");
 735 }
 736
 737 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 738 {
 739         double total, ratio = 0.0;
 740         char cpustr[16] = { '\0', };
 741         const char *fmt;
 742
 743         if (csv_output)
 744                 fmt = "%s%.0f%s%s";
 745         else if (big_num)
 746                 fmt = "%s%'18.0f%s%-25s";
 747         else
 748                 fmt = "%s%18.0f%s%-25s";
 749
 750         if (no_aggr)
 751                 sprintf(cpustr, "CPU%*d%s",
 752                         csv_output ? 0 : -4,
 753                         evsel_list->cpus->map[cpu], csv_sep);
 754         else
 755                 cpu = 0;
 756
 757         fprintf(output, fmt, cpustr, avg, csv_sep, perf_evsel__name(evsel));
 758
 759         if (evsel->cgrp)
 760                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
 761
 762         if (csv_output)
 763                 return;
 764
 765         if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
 766                 total = avg_stats(&runtime_cycles_stats[cpu]);
 767
 768                 if (total)
 769                         ratio = avg / total;
 770
 771                 fprintf(output, " #   %5.2f  insns per cycle        ", ratio);
 772
 773                 total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
 774                 total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
 775
 776                 if (total && avg) {
 777                         ratio = total / avg;
 778                         fprintf(output, "\n                                             #   %5.2f  stalled cycles per insn", ratio);
 779                 }
 780
 781         } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
 782                         runtime_branches_stats[cpu].n != 0) {
 783                 print_branch_misses(cpu, evsel, avg);
 784         } else if (
 785                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 786                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1D |
 787                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 788                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 789                         runtime_l1_dcache_stats[cpu].n != 0) {
 790                 print_l1_dcache_misses(cpu, evsel, avg);
 791         } else if (
 792                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 793                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1I |
 794                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 795                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 796                         runtime_l1_icache_stats[cpu].n != 0) {
 797                 print_l1_icache_misses(cpu, evsel, avg);
 798         } else if (
 799                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 800                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_DTLB |
 801                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 802                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 803                         runtime_dtlb_cache_stats[cpu].n != 0) {
 804                 print_dtlb_cache_misses(cpu, evsel, avg);
 805         } else if (
 806                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 807                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_ITLB |
 808                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 809                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 810                         runtime_itlb_cache_stats[cpu].n != 0) {
 811                 print_itlb_cache_misses(cpu, evsel, avg);
 812         } else if (
 813                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 814                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_LL |
 815                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 816                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 817                         runtime_ll_cache_stats[cpu].n != 0) {
 818                 print_ll_cache_misses(cpu, evsel, avg);
 819         } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) &&
 820                         runtime_cacherefs_stats[cpu].n != 0) {
 821                 total = avg_stats(&runtime_cacherefs_stats[cpu]);
 822
 823                 if (total)
 824                         ratio = avg * 100 / total;
 825
 826                 fprintf(output, " # %8.3f %% of all cache refs    ", ratio);
 827
 828         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND)) {
 829                 print_stalled_cycles_frontend(cpu, evsel, avg);
 830         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_BACKEND)) {
 831                 print_stalled_cycles_backend(cpu, evsel, avg);
 832         } else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
 833                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 834
 835                 if (total)
 836                         ratio = 1.0 * avg / total;
 837
 838                 fprintf(output, " # %8.3f GHz                    ", ratio);
 839         } else if (runtime_nsecs_stats[cpu].n != 0) {
 840                 char unit = 'M';
 841
 842                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 843
 844                 if (total)
 845                         ratio = 1000.0 * avg / total;
 846                 if (ratio < 0.001) {
 847                         ratio *= 1000;
 848                         unit = 'K';
 849                 }
 850
 851                 fprintf(output, " # %8.3f %c/sec                  ", ratio, unit);
 852         } else {
 853                 fprintf(output, "                                   ");
 854         }
 855 }
 856
 857 /*
 858  * Print out the results of a single counter:
 859  * aggregated counts in system-wide mode
 860  */
 861 static void print_counter_aggr(struct perf_evsel *counter)
 862 {
 863         struct perf_stat *ps = counter->priv;
 864         double avg = avg_stats(&ps->res_stats[0]);
 865         int scaled = counter->counts->scaled;
 866
 867         if (scaled == -1) {
 868                 fprintf(output, "%*s%s%*s",
 869                         csv_output ? 0 : 18,
 870                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 871                         csv_sep,
 872                         csv_output ? 0 : -24,
 873                         perf_evsel__name(counter));
 874
 875                 if (counter->cgrp)
 876                         fprintf(output, "%s%s", csv_sep, counter->cgrp->name);
 877
 878                 fputc('\n', output);
 879                 return;
 880         }
 881
 882         if (nsec_counter(counter))
 883                 nsec_printout(-1, counter, avg);
 884         else
 885                 abs_printout(-1, counter, avg);
 886
 887         print_noise(counter, avg);
 888
 889         if (csv_output) {
 890                 fputc('\n', output);
 891                 return;
 892         }
 893
 894         if (scaled) {
 895                 double avg_enabled, avg_running;
 896
 897                 avg_enabled = avg_stats(&ps->res_stats[1]);
 898                 avg_running = avg_stats(&ps->res_stats[2]);
 899
 900                 fprintf(output, " [%5.2f%%]", 100 * avg_running / avg_enabled);
 901         }
 902         fprintf(output, "\n");
 903 }
 904
 905 /*
 906  * Print out the results of a single counter:
 907  * does not use aggregated count in system-wide
 908  */
 909 static void print_counter(struct perf_evsel *counter)
 910 {
 911         u64 ena, run, val;
 912         int cpu;
 913
 914         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 915                 val = counter->counts->cpu[cpu].val;
 916                 ena = counter->counts->cpu[cpu].ena;
 917                 run = counter->counts->cpu[cpu].run;
 918                 if (run == 0 || ena == 0) {
 919                         fprintf(output, "CPU%*d%s%*s%s%*s",
 920                                 csv_output ? 0 : -4,
 921                                 evsel_list->cpus->map[cpu], csv_sep,
 922                                 csv_output ? 0 : 18,
 923                                 counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 924                                 csv_sep,
 925                                 csv_output ? 0 : -24,
 926                                 perf_evsel__name(counter));
 927
 928                         if (counter->cgrp)
 929                                 fprintf(output, "%s%s",
 930                                         csv_sep, counter->cgrp->name);
 931
 932                         fputc('\n', output);
 933                         continue;
 934                 }
 935
 936                 if (nsec_counter(counter))
 937                         nsec_printout(cpu, counter, val);
 938                 else
 939                         abs_printout(cpu, counter, val);
 940
 941                 if (!csv_output) {
 942                         print_noise(counter, 1.0);
 943
 944                         if (run != ena)
 945                                 fprintf(output, "  (%.2f%%)",
 946                                         100.0 * run / ena);
 947                 }
 948                 fputc('\n', output);
 949         }
 950 }
 951
 952 static void print_stat(int argc, const char **argv)
 953 {
 954         struct perf_evsel *counter;
 955         int i;
 956
 957         fflush(stdout);
 958
 959         if (!csv_output) {
 960                 fprintf(output, "\n");
 961                 fprintf(output, " Performance counter stats for ");
 962                 if (!perf_target__has_task(&target)) {
 963                         fprintf(output, "\'%s", argv[0]);
 964                         for (i = 1; i < argc; i++)
 965                                 fprintf(output, " %s", argv[i]);
 966                 } else if (target.pid)
 967                         fprintf(output, "process id \'%s", target.pid);
 968                 else
 969                         fprintf(output, "thread id \'%s", target.tid);
 970
 971                 fprintf(output, "\'");
 972                 if (run_count > 1)
 973                         fprintf(output, " (%d runs)", run_count);
 974                 fprintf(output, ":\n\n");
 975         }
 976
 977         if (no_aggr) {
 978                 list_for_each_entry(counter, &evsel_list->entries, node)
 979                         print_counter(counter);
 980         } else {
 981                 list_for_each_entry(counter, &evsel_list->entries, node)
 982                         print_counter_aggr(counter);
 983         }
 984
 985         if (!csv_output) {
 986                 if (!null_run)
 987                         fprintf(output, "\n");
 988                 fprintf(output, " %17.9f seconds time elapsed",
 989                                 avg_stats(&walltime_nsecs_stats)/1e9);
 990                 if (run_count > 1) {
 991                         fprintf(output, "                                        ");
 992                         print_noise_pct(stddev_stats(&walltime_nsecs_stats),
 993                                         avg_stats(&walltime_nsecs_stats));
 994                 }
 995                 fprintf(output, "\n\n");
 996         }
 997 }
 998
 999 static volatile int signr = -1;
1000
1001 static void skip_signal(int signo)
1002 {
1003         if(child_pid == -1)
1004                 done = 1;
1005
1006         signr = signo;
1007 }
1008
1009 static void sig_atexit(void)
1010 {
1011         if (child_pid != -1)
1012                 kill(child_pid, SIGTERM);
1013
1014         if (signr == -1)
1015                 return;
1016
1017         signal(signr, SIG_DFL);
1018         kill(getpid(), signr);
1019 }
1020
1021 static const char * const stat_usage[] = {
1022         "perf stat [<options>] [<command>]",
1023         NULL
1024 };
1025
1026 static int stat__set_big_num(const struct option *opt __maybe_unused,
1027                              const char *s __maybe_unused, int unset)
1028 {
1029         big_num_opt = unset ? 0 : 1;
1030         return 0;
1031 }
1032
1033 static bool append_file;
1034
1035 static const struct option options[] = {
1036         OPT_CALLBACK('e', "event", &evsel_list, "event",
1037                      "event selector. use 'perf list' to list available events",
1038                      parse_events_option),
1039         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
1040                      "event filter", parse_filter),
1041         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
1042                     "child tasks do not inherit counters"),
1043         OPT_STRING('p', "pid", &target.pid, "pid",
1044                    "stat events on existing process id"),
1045         OPT_STRING('t', "tid", &target.tid, "tid",
1046                    "stat events on existing thread id"),
1047         OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
1048                     "system-wide collection from all CPUs"),
1049         OPT_BOOLEAN('g', "group", &group,
1050                     "put the counters into a counter group"),
1051         OPT_BOOLEAN('c', "scale", &scale,
1052                     "scale/normalize counters"),
1053         OPT_INCR('v', "verbose", &verbose,
1054                     "be more verbose (show counter open errors, etc)"),
1055         OPT_INTEGER('r', "repeat", &run_count,
1056                     "repeat command and print average + stddev (max: 100)"),
1057         OPT_BOOLEAN('n', "null", &null_run,
1058                     "null run - dont start any counters"),
1059         OPT_INCR('d', "detailed", &detailed_run,
1060                     "detailed run - start a lot of events"),
1061         OPT_BOOLEAN('S', "sync", &sync_run,
1062                     "call sync() before starting a run"),
1063         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
1064                            "print large numbers with thousands\' separators",
1065                            stat__set_big_num),
1066         OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
1067                     "list of cpus to monitor in system-wide"),
1068         OPT_BOOLEAN('A', "no-aggr", &no_aggr,
1069                     "disable CPU count aggregation"),
1070         OPT_STRING('x', "field-separator", &csv_sep, "separator",
1071                    "print counts with custom separator"),
1072         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
1073                      "monitor event in cgroup name only",
1074                      parse_cgroups),
1075         OPT_STRING('o', "output", &output_name, "file",
1076                     "output file name"),
1077         OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
1078         OPT_INTEGER(0, "log-fd", &output_fd,
1079                     "log output to fd, instead of stderr"),
1080         OPT_END()
1081 };
1082
1083 /*
1084  * Add default attributes, if there were no attributes specified or
1085  * if -d/--detailed, -d -d or -d -d -d is used:
1086  */
1087 static int add_default_attributes(void)
1088 {
1089         /* Set attrs if no event is selected and !null_run: */
1090         if (null_run)
1091                 return 0;
1092
1093         if (!evsel_list->nr_entries) {
1094                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs) < 0)
1095                         return -1;
1096         }
1097
1098         /* Detailed events get appended to the event list: */
1099
1100         if (detailed_run <  1)
1101                 return 0;
1102
1103         /* Append detailed run extra attributes: */
1104         if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
1105                 return -1;
1106
1107         if (detailed_run < 2)
1108                 return 0;
1109
1110         /* Append very detailed run extra attributes: */
1111         if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
1112                 return -1;
1113
1114         if (detailed_run < 3)
1115                 return 0;
1116
1117         /* Append very, very detailed run extra attributes: */
1118         return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
1119 }
1120
1121 int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
1122 {
1123         struct perf_evsel *pos;
1124         int status = -ENOMEM;
1125         const char *mode;
1126
1127         setlocale(LC_ALL, "");
1128
1129         evsel_list = perf_evlist__new(NULL, NULL);
1130         if (evsel_list == NULL)
1131                 return -ENOMEM;
1132
1133         argc = parse_options(argc, argv, options, stat_usage,
1134                 PARSE_OPT_STOP_AT_NON_OPTION);
1135
1136         output = stderr;
1137         if (output_name && strcmp(output_name, "-"))
1138                 output = NULL;
1139
1140         if (output_name && output_fd) {
1141                 fprintf(stderr, "cannot use both --output and --log-fd\n");
1142                 usage_with_options(stat_usage, options);
1143         }
1144
1145         if (output_fd < 0) {
1146                 fprintf(stderr, "argument to --log-fd must be a > 0\n");
1147                 usage_with_options(stat_usage, options);
1148         }
1149
1150         if (!output) {
1151                 struct timespec tm;
1152                 mode = append_file ? "a" : "w";
1153
1154                 output = fopen(output_name, mode);
1155                 if (!output) {
1156                         perror("failed to create output file");
1157                         return -1;
1158                 }
1159                 clock_gettime(CLOCK_REALTIME, &tm);
1160                 fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
1161         } else if (output_fd > 0) {
1162                 mode = append_file ? "a" : "w";
1163                 output = fdopen(output_fd, mode);
1164                 if (!output) {
1165                         perror("Failed opening logfd");
1166                         return -errno;
1167                 }
1168         }
1169
1170         if (csv_sep) {
1171                 csv_output = true;
1172                 if (!strcmp(csv_sep, "\\t"))
1173                         csv_sep = "\t";
1174         } else
1175                 csv_sep = DEFAULT_SEPARATOR;
1176
1177         /*
1178          * let the spreadsheet do the pretty-printing
1179          */
1180         if (csv_output) {
1181                 /* User explicitly passed -B? */
1182                 if (big_num_opt == 1) {
1183                         fprintf(stderr, "-B option not supported with -x\n");
1184                         usage_with_options(stat_usage, options);
1185                 } else /* Nope, so disable big number formatting */
1186                         big_num = false;
1187         } else if (big_num_opt == 0) /* User passed --no-big-num */
1188                 big_num = false;
1189
1190         if (!argc && !perf_target__has_task(&target))
1191                 usage_with_options(stat_usage, options);
1192         if (run_count <= 0)
1193                 usage_with_options(stat_usage, options);
1194
1195         /* no_aggr, cgroup are for system-wide only */
1196         if ((no_aggr || nr_cgroups) && !perf_target__has_cpu(&target)) {
1197                 fprintf(stderr, "both cgroup and no-aggregation "
1198                         "modes only available in system-wide mode\n");
1199
1200                 usage_with_options(stat_usage, options);
1201         }
1202
1203         if (add_default_attributes())
1204                 goto out;
1205
1206         perf_target__validate(&target);
1207
1208         if (perf_evlist__create_maps(evsel_list, &target) < 0) {
1209                 if (perf_target__has_task(&target))
1210                         pr_err("Problems finding threads of monitor\n");
1211                 if (perf_target__has_cpu(&target))
1212                         perror("failed to parse CPUs map");
1213
1214                 usage_with_options(stat_usage, options);
1215                 return -1;
1216         }
1217
1218         list_for_each_entry(pos, &evsel_list->entries, node) {
1219                 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
1220                     perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0)
1221                         goto out_free_fd;
1222         }
1223
1224         /*
1225          * We dont want to block the signals - that would cause
1226          * child tasks to inherit that and Ctrl-C would not work.
1227          * What we want is for Ctrl-C to work in the exec()-ed
1228          * task, but being ignored by perf stat itself:
1229          */
1230         atexit(sig_atexit);
1231         signal(SIGINT,  skip_signal);
1232         signal(SIGALRM, skip_signal);
1233         signal(SIGABRT, skip_signal);
1234
1235         status = 0;
1236         for (run_idx = 0; run_idx < run_count; run_idx++) {
1237                 if (run_count != 1 && verbose)
1238                         fprintf(output, "[ perf stat: executing run #%d ... ]\n",
1239                                 run_idx + 1);
1240
1241                 if (sync_run)
1242                         sync();
1243
1244                 status = run_perf_stat(argc, argv);
1245         }
1246
1247         if (status != -1)
1248                 print_stat(argc, argv);
1249 out_free_fd:
1250         list_for_each_entry(pos, &evsel_list->entries, node)
1251                 perf_evsel__free_stat_priv(pos);
1252         perf_evlist__delete_maps(evsel_list);
1253 out:
1254         perf_evlist__delete(evsel_list);
1255         return status;
1256 }