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/header.h"
  55 #include "util/cpumap.h"
  56 #include "util/thread.h"
  57 #include "util/thread_map.h"
  58
  59 #include <sys/prctl.h>
  60 #include <math.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 struct perf_evlist              *evsel_list;
 177
 178 static bool                     system_wide                     =  false;
 179 static int                      run_idx                         =  0;
 180
 181 static int                      run_count                       =  1;
 182 static bool                     no_inherit                      = false;
 183 static bool                     scale                           =  true;
 184 static bool                     no_aggr                         = false;
 185 static pid_t                    target_pid                      = -1;
 186 static pid_t                    target_tid                      = -1;
 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               *cpu_list;
 194 static const char               *csv_sep                        = NULL;
 195 static bool                     csv_output                      = false;
 196
 197 static volatile int done = 0;
 198
 199 struct stats
 200 {
 201         double n, mean, M2;
 202 };
 203
 204 struct perf_stat {
 205         struct stats      res_stats[3];
 206 };
 207
 208 static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
 209 {
 210         evsel->priv = zalloc(sizeof(struct perf_stat));
 211         return evsel->priv == NULL ? -ENOMEM : 0;
 212 }
 213
 214 static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
 215 {
 216         free(evsel->priv);
 217         evsel->priv = NULL;
 218 }
 219
 220 static void update_stats(struct stats *stats, u64 val)
 221 {
 222         double delta;
 223
 224         stats->n++;
 225         delta = val - stats->mean;
 226         stats->mean += delta / stats->n;
 227         stats->M2 += delta*(val - stats->mean);
 228 }
 229
 230 static double avg_stats(struct stats *stats)
 231 {
 232         return stats->mean;
 233 }
 234
 235 /*
 236  * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
 237  *
 238  *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
 239  * s^2 = -------------------------------
 240  *                  n - 1
 241  *
 242  * http://en.wikipedia.org/wiki/Stddev
 243  *
 244  * The std dev of the mean is related to the std dev by:
 245  *
 246  *             s
 247  * s_mean = -------
 248  *          sqrt(n)
 249  *
 250  */
 251 static double stddev_stats(struct stats *stats)
 252 {
 253         double variance = stats->M2 / (stats->n - 1);
 254         double variance_mean = variance / stats->n;
 255
 256         return sqrt(variance_mean);
 257 }
 258
 259 struct stats                    runtime_nsecs_stats[MAX_NR_CPUS];
 260 struct stats                    runtime_cycles_stats[MAX_NR_CPUS];
 261 struct stats                    runtime_stalled_cycles_front_stats[MAX_NR_CPUS];
 262 struct stats                    runtime_stalled_cycles_back_stats[MAX_NR_CPUS];
 263 struct stats                    runtime_branches_stats[MAX_NR_CPUS];
 264 struct stats                    runtime_cacherefs_stats[MAX_NR_CPUS];
 265 struct stats                    runtime_l1_dcache_stats[MAX_NR_CPUS];
 266 struct stats                    runtime_l1_icache_stats[MAX_NR_CPUS];
 267 struct stats                    runtime_ll_cache_stats[MAX_NR_CPUS];
 268 struct stats                    runtime_itlb_cache_stats[MAX_NR_CPUS];
 269 struct stats                    runtime_dtlb_cache_stats[MAX_NR_CPUS];
 270 struct stats                    walltime_nsecs_stats;
 271
 272 static int create_perf_stat_counter(struct perf_evsel *evsel)
 273 {
 274         struct perf_event_attr *attr = &evsel->attr;
 275
 276         if (scale)
 277                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 278                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 279
 280         attr->inherit = !no_inherit;
 281
 282         if (system_wide)
 283                 return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, false);
 284
 285         if (target_pid == -1 && target_tid == -1) {
 286                 attr->disabled = 1;
 287                 attr->enable_on_exec = 1;
 288         }
 289
 290         return perf_evsel__open_per_thread(evsel, evsel_list->threads, false);
 291 }
 292
 293 /*
 294  * Does the counter have nsecs as a unit?
 295  */
 296 static inline int nsec_counter(struct perf_evsel *evsel)
 297 {
 298         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
 299             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 300                 return 1;
 301
 302         return 0;
 303 }
 304
 305 /*
 306  * Update various tracking values we maintain to print
 307  * more semantic information such as miss/hit ratios,
 308  * instruction rates, etc:
 309  */
 310 static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
 311 {
 312         if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
 313                 update_stats(&runtime_nsecs_stats[0], count[0]);
 314         else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
 315                 update_stats(&runtime_cycles_stats[0], count[0]);
 316         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
 317                 update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
 318         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_BACKEND))
 319                 update_stats(&runtime_stalled_cycles_back_stats[0], count[0]);
 320         else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
 321                 update_stats(&runtime_branches_stats[0], count[0]);
 322         else if (perf_evsel__match(counter, HARDWARE, HW_CACHE_REFERENCES))
 323                 update_stats(&runtime_cacherefs_stats[0], count[0]);
 324         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1D))
 325                 update_stats(&runtime_l1_dcache_stats[0], count[0]);
 326         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1I))
 327                 update_stats(&runtime_l1_icache_stats[0], count[0]);
 328         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_LL))
 329                 update_stats(&runtime_ll_cache_stats[0], count[0]);
 330         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_DTLB))
 331                 update_stats(&runtime_dtlb_cache_stats[0], count[0]);
 332         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_ITLB))
 333                 update_stats(&runtime_itlb_cache_stats[0], count[0]);
 334 }
 335
 336 /*
 337  * Read out the results of a single counter:
 338  * aggregate counts across CPUs in system-wide mode
 339  */
 340 static int read_counter_aggr(struct perf_evsel *counter)
 341 {
 342         struct perf_stat *ps = counter->priv;
 343         u64 *count = counter->counts->aggr.values;
 344         int i;
 345
 346         if (__perf_evsel__read(counter, evsel_list->cpus->nr,
 347                                evsel_list->threads->nr, scale) < 0)
 348                 return -1;
 349
 350         for (i = 0; i < 3; i++)
 351                 update_stats(&ps->res_stats[i], count[i]);
 352
 353         if (verbose) {
 354                 fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 355                         event_name(counter), count[0], count[1], count[2]);
 356         }
 357
 358         /*
 359          * Save the full runtime - to allow normalization during printout:
 360          */
 361         update_shadow_stats(counter, count);
 362
 363         return 0;
 364 }
 365
 366 /*
 367  * Read out the results of a single counter:
 368  * do not aggregate counts across CPUs in system-wide mode
 369  */
 370 static int read_counter(struct perf_evsel *counter)
 371 {
 372         u64 *count;
 373         int cpu;
 374
 375         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 376                 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
 377                         return -1;
 378
 379                 count = counter->counts->cpu[cpu].values;
 380
 381                 update_shadow_stats(counter, count);
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int run_perf_stat(int argc __used, const char **argv)
 388 {
 389         unsigned long long t0, t1;
 390         struct perf_evsel *counter;
 391         int status = 0;
 392         int child_ready_pipe[2], go_pipe[2];
 393         const bool forks = (argc > 0);
 394         char buf;
 395
 396         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 397                 perror("failed to create pipes");
 398                 exit(1);
 399         }
 400
 401         if (forks) {
 402                 if ((child_pid = fork()) < 0)
 403                         perror("failed to fork");
 404
 405                 if (!child_pid) {
 406                         close(child_ready_pipe[0]);
 407                         close(go_pipe[1]);
 408                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 409
 410                         /*
 411                          * Do a dummy execvp to get the PLT entry resolved,
 412                          * so we avoid the resolver overhead on the real
 413                          * execvp call.
 414                          */
 415                         execvp("", (char **)argv);
 416
 417                         /*
 418                          * Tell the parent we're ready to go
 419                          */
 420                         close(child_ready_pipe[1]);
 421
 422                         /*
 423                          * Wait until the parent tells us to go.
 424                          */
 425                         if (read(go_pipe[0], &buf, 1) == -1)
 426                                 perror("unable to read pipe");
 427
 428                         execvp(argv[0], (char **)argv);
 429
 430                         perror(argv[0]);
 431                         exit(-1);
 432                 }
 433
 434                 if (target_tid == -1 && target_pid == -1 && !system_wide)
 435                         evsel_list->threads->map[0] = child_pid;
 436
 437                 /*
 438                  * Wait for the child to be ready to exec.
 439                  */
 440                 close(child_ready_pipe[1]);
 441                 close(go_pipe[0]);
 442                 if (read(child_ready_pipe[0], &buf, 1) == -1)
 443                         perror("unable to read pipe");
 444                 close(child_ready_pipe[0]);
 445         }
 446
 447         list_for_each_entry(counter, &evsel_list->entries, node) {
 448                 if (create_perf_stat_counter(counter) < 0) {
 449                         if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
 450                                 if (verbose)
 451                                         ui__warning("%s event is not supported by the kernel.\n",
 452                                                     event_name(counter));
 453                                 counter->supported = false;
 454                                 continue;
 455                         }
 456
 457                         if (errno == EPERM || errno == EACCES) {
 458                                 error("You may not have permission to collect %sstats.\n"
 459                                       "\t Consider tweaking"
 460                                       " /proc/sys/kernel/perf_event_paranoid or running as root.",
 461                                       system_wide ? "system-wide " : "");
 462                         } else {
 463                                 error("open_counter returned with %d (%s). "
 464                                       "/bin/dmesg may provide additional information.\n",
 465                                        errno, strerror(errno));
 466                         }
 467                         if (child_pid != -1)
 468                                 kill(child_pid, SIGTERM);
 469                         die("Not all events could be opened.\n");
 470                         return -1;
 471                 }
 472                 counter->supported = true;
 473         }
 474
 475         if (perf_evlist__set_filters(evsel_list)) {
 476                 error("failed to set filter with %d (%s)\n", errno,
 477                         strerror(errno));
 478                 return -1;
 479         }
 480
 481         /*
 482          * Enable counters and exec the command:
 483          */
 484         t0 = rdclock();
 485
 486         if (forks) {
 487                 close(go_pipe[1]);
 488                 wait(&status);
 489         } else {
 490                 while(!done) sleep(1);
 491         }
 492
 493         t1 = rdclock();
 494
 495         update_stats(&walltime_nsecs_stats, t1 - t0);
 496
 497         if (no_aggr) {
 498                 list_for_each_entry(counter, &evsel_list->entries, node) {
 499                         read_counter(counter);
 500                         perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
 501                 }
 502         } else {
 503                 list_for_each_entry(counter, &evsel_list->entries, node) {
 504                         read_counter_aggr(counter);
 505                         perf_evsel__close_fd(counter, evsel_list->cpus->nr,
 506                                              evsel_list->threads->nr);
 507                 }
 508         }
 509
 510         return WEXITSTATUS(status);
 511 }
 512
 513 static void print_noise_pct(double total, double avg)
 514 {
 515         double pct = 0.0;
 516
 517         if (avg)
 518                 pct = 100.0*total/avg;
 519
 520         if (csv_output)
 521                 fprintf(stderr, "%s%.2f%%", csv_sep, pct);
 522         else
 523                 fprintf(stderr, "  ( +-%6.2f%% )", pct);
 524 }
 525
 526 static void print_noise(struct perf_evsel *evsel, double avg)
 527 {
 528         struct perf_stat *ps;
 529
 530         if (run_count == 1)
 531                 return;
 532
 533         ps = evsel->priv;
 534         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
 535 }
 536
 537 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
 538 {
 539         double msecs = avg / 1e6;
 540         char cpustr[16] = { '\0', };
 541         const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-25s";
 542
 543         if (no_aggr)
 544                 sprintf(cpustr, "CPU%*d%s",
 545                         csv_output ? 0 : -4,
 546                         evsel_list->cpus->map[cpu], csv_sep);
 547
 548         fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
 549
 550         if (evsel->cgrp)
 551                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
 552
 553         if (csv_output)
 554                 return;
 555
 556         if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 557                 fprintf(stderr, " # %8.3f CPUs utilized          ", avg / avg_stats(&walltime_nsecs_stats));
 558 }
 559
 560 static void print_stalled_cycles_frontend(int cpu, struct perf_evsel *evsel __used, double avg)
 561 {
 562         double total, ratio = 0.0;
 563         const char *color;
 564
 565         total = avg_stats(&runtime_cycles_stats[cpu]);
 566
 567         if (total)
 568                 ratio = avg / total * 100.0;
 569
 570         color = PERF_COLOR_NORMAL;
 571         if (ratio > 50.0)
 572                 color = PERF_COLOR_RED;
 573         else if (ratio > 30.0)
 574                 color = PERF_COLOR_MAGENTA;
 575         else if (ratio > 10.0)
 576                 color = PERF_COLOR_YELLOW;
 577
 578         fprintf(stderr, " #  ");
 579         color_fprintf(stderr, color, "%6.2f%%", ratio);
 580         fprintf(stderr, " frontend cycles idle   ");
 581 }
 582
 583 static void print_stalled_cycles_backend(int cpu, struct perf_evsel *evsel __used, double avg)
 584 {
 585         double total, ratio = 0.0;
 586         const char *color;
 587
 588         total = avg_stats(&runtime_cycles_stats[cpu]);
 589
 590         if (total)
 591                 ratio = avg / total * 100.0;
 592
 593         color = PERF_COLOR_NORMAL;
 594         if (ratio > 75.0)
 595                 color = PERF_COLOR_RED;
 596         else if (ratio > 50.0)
 597                 color = PERF_COLOR_MAGENTA;
 598         else if (ratio > 20.0)
 599                 color = PERF_COLOR_YELLOW;
 600
 601         fprintf(stderr, " #  ");
 602         color_fprintf(stderr, color, "%6.2f%%", ratio);
 603         fprintf(stderr, " backend  cycles idle   ");
 604 }
 605
 606 static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 607 {
 608         double total, ratio = 0.0;
 609         const char *color;
 610
 611         total = avg_stats(&runtime_branches_stats[cpu]);
 612
 613         if (total)
 614                 ratio = avg / total * 100.0;
 615
 616         color = PERF_COLOR_NORMAL;
 617         if (ratio > 20.0)
 618                 color = PERF_COLOR_RED;
 619         else if (ratio > 10.0)
 620                 color = PERF_COLOR_MAGENTA;
 621         else if (ratio > 5.0)
 622                 color = PERF_COLOR_YELLOW;
 623
 624         fprintf(stderr, " #  ");
 625         color_fprintf(stderr, color, "%6.2f%%", ratio);
 626         fprintf(stderr, " of all branches        ");
 627 }
 628
 629 static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 630 {
 631         double total, ratio = 0.0;
 632         const char *color;
 633
 634         total = avg_stats(&runtime_l1_dcache_stats[cpu]);
 635
 636         if (total)
 637                 ratio = avg / total * 100.0;
 638
 639         color = PERF_COLOR_NORMAL;
 640         if (ratio > 20.0)
 641                 color = PERF_COLOR_RED;
 642         else if (ratio > 10.0)
 643                 color = PERF_COLOR_MAGENTA;
 644         else if (ratio > 5.0)
 645                 color = PERF_COLOR_YELLOW;
 646
 647         fprintf(stderr, " #  ");
 648         color_fprintf(stderr, color, "%6.2f%%", ratio);
 649         fprintf(stderr, " of all L1-dcache hits  ");
 650 }
 651
 652 static void print_l1_icache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 653 {
 654         double total, ratio = 0.0;
 655         const char *color;
 656
 657         total = avg_stats(&runtime_l1_icache_stats[cpu]);
 658
 659         if (total)
 660                 ratio = avg / total * 100.0;
 661
 662         color = PERF_COLOR_NORMAL;
 663         if (ratio > 20.0)
 664                 color = PERF_COLOR_RED;
 665         else if (ratio > 10.0)
 666                 color = PERF_COLOR_MAGENTA;
 667         else if (ratio > 5.0)
 668                 color = PERF_COLOR_YELLOW;
 669
 670         fprintf(stderr, " #  ");
 671         color_fprintf(stderr, color, "%6.2f%%", ratio);
 672         fprintf(stderr, " of all L1-icache hits  ");
 673 }
 674
 675 static void print_dtlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 676 {
 677         double total, ratio = 0.0;
 678         const char *color;
 679
 680         total = avg_stats(&runtime_dtlb_cache_stats[cpu]);
 681
 682         if (total)
 683                 ratio = avg / total * 100.0;
 684
 685         color = PERF_COLOR_NORMAL;
 686         if (ratio > 20.0)
 687                 color = PERF_COLOR_RED;
 688         else if (ratio > 10.0)
 689                 color = PERF_COLOR_MAGENTA;
 690         else if (ratio > 5.0)
 691                 color = PERF_COLOR_YELLOW;
 692
 693         fprintf(stderr, " #  ");
 694         color_fprintf(stderr, color, "%6.2f%%", ratio);
 695         fprintf(stderr, " of all dTLB cache hits ");
 696 }
 697
 698 static void print_itlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 699 {
 700         double total, ratio = 0.0;
 701         const char *color;
 702
 703         total = avg_stats(&runtime_itlb_cache_stats[cpu]);
 704
 705         if (total)
 706                 ratio = avg / total * 100.0;
 707
 708         color = PERF_COLOR_NORMAL;
 709         if (ratio > 20.0)
 710                 color = PERF_COLOR_RED;
 711         else if (ratio > 10.0)
 712                 color = PERF_COLOR_MAGENTA;
 713         else if (ratio > 5.0)
 714                 color = PERF_COLOR_YELLOW;
 715
 716         fprintf(stderr, " #  ");
 717         color_fprintf(stderr, color, "%6.2f%%", ratio);
 718         fprintf(stderr, " of all iTLB cache hits ");
 719 }
 720
 721 static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 722 {
 723         double total, ratio = 0.0;
 724         const char *color;
 725
 726         total = avg_stats(&runtime_ll_cache_stats[cpu]);
 727
 728         if (total)
 729                 ratio = avg / total * 100.0;
 730
 731         color = PERF_COLOR_NORMAL;
 732         if (ratio > 20.0)
 733                 color = PERF_COLOR_RED;
 734         else if (ratio > 10.0)
 735                 color = PERF_COLOR_MAGENTA;
 736         else if (ratio > 5.0)
 737                 color = PERF_COLOR_YELLOW;
 738
 739         fprintf(stderr, " #  ");
 740         color_fprintf(stderr, color, "%6.2f%%", ratio);
 741         fprintf(stderr, " of all LL-cache hits   ");
 742 }
 743
 744 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 745 {
 746         double total, ratio = 0.0;
 747         char cpustr[16] = { '\0', };
 748         const char *fmt;
 749
 750         if (csv_output)
 751                 fmt = "%s%.0f%s%s";
 752         else if (big_num)
 753                 fmt = "%s%'18.0f%s%-25s";
 754         else
 755                 fmt = "%s%18.0f%s%-25s";
 756
 757         if (no_aggr)
 758                 sprintf(cpustr, "CPU%*d%s",
 759                         csv_output ? 0 : -4,
 760                         evsel_list->cpus->map[cpu], csv_sep);
 761         else
 762                 cpu = 0;
 763
 764         fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
 765
 766         if (evsel->cgrp)
 767                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
 768
 769         if (csv_output)
 770                 return;
 771
 772         if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
 773                 total = avg_stats(&runtime_cycles_stats[cpu]);
 774
 775                 if (total)
 776                         ratio = avg / total;
 777
 778                 fprintf(stderr, " #   %5.2f  insns per cycle        ", ratio);
 779
 780                 total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
 781                 total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
 782
 783                 if (total && avg) {
 784                         ratio = total / avg;
 785                         fprintf(stderr, "\n                                             #   %5.2f  stalled cycles per insn", ratio);
 786                 }
 787
 788         } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
 789                         runtime_branches_stats[cpu].n != 0) {
 790                 print_branch_misses(cpu, evsel, avg);
 791         } else if (
 792                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 793                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1D |
 794                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 795                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 796                         runtime_l1_dcache_stats[cpu].n != 0) {
 797                 print_l1_dcache_misses(cpu, evsel, avg);
 798         } else if (
 799                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 800                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1I |
 801                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 802                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 803                         runtime_l1_icache_stats[cpu].n != 0) {
 804                 print_l1_icache_misses(cpu, evsel, avg);
 805         } else if (
 806                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 807                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_DTLB |
 808                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 809                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 810                         runtime_dtlb_cache_stats[cpu].n != 0) {
 811                 print_dtlb_cache_misses(cpu, evsel, avg);
 812         } else if (
 813                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 814                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_ITLB |
 815                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 816                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 817                         runtime_itlb_cache_stats[cpu].n != 0) {
 818                 print_itlb_cache_misses(cpu, evsel, avg);
 819         } else if (
 820                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 821                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_LL |
 822                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 823                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 824                         runtime_ll_cache_stats[cpu].n != 0) {
 825                 print_ll_cache_misses(cpu, evsel, avg);
 826         } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) &&
 827                         runtime_cacherefs_stats[cpu].n != 0) {
 828                 total = avg_stats(&runtime_cacherefs_stats[cpu]);
 829
 830                 if (total)
 831                         ratio = avg * 100 / total;
 832
 833                 fprintf(stderr, " # %8.3f %% of all cache refs    ", ratio);
 834
 835         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND)) {
 836                 print_stalled_cycles_frontend(cpu, evsel, avg);
 837         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_BACKEND)) {
 838                 print_stalled_cycles_backend(cpu, evsel, avg);
 839         } else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
 840                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 841
 842                 if (total)
 843                         ratio = 1.0 * avg / total;
 844
 845                 fprintf(stderr, " # %8.3f GHz                    ", ratio);
 846         } else if (runtime_nsecs_stats[cpu].n != 0) {
 847                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 848
 849                 if (total)
 850                         ratio = 1000.0 * avg / total;
 851
 852                 fprintf(stderr, " # %8.3f M/sec                  ", ratio);
 853         } else {
 854                 fprintf(stderr, "                                   ");
 855         }
 856 }
 857
 858 /*
 859  * Print out the results of a single counter:
 860  * aggregated counts in system-wide mode
 861  */
 862 static void print_counter_aggr(struct perf_evsel *counter)
 863 {
 864         struct perf_stat *ps = counter->priv;
 865         double avg = avg_stats(&ps->res_stats[0]);
 866         int scaled = counter->counts->scaled;
 867
 868         if (scaled == -1) {
 869                 fprintf(stderr, "%*s%s%*s",
 870                         csv_output ? 0 : 18,
 871                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 872                         csv_sep,
 873                         csv_output ? 0 : -24,
 874                         event_name(counter));
 875
 876                 if (counter->cgrp)
 877                         fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
 878
 879                 fputc('\n', stderr);
 880                 return;
 881         }
 882
 883         if (nsec_counter(counter))
 884                 nsec_printout(-1, counter, avg);
 885         else
 886                 abs_printout(-1, counter, avg);
 887
 888         print_noise(counter, avg);
 889
 890         if (csv_output) {
 891                 fputc('\n', stderr);
 892                 return;
 893         }
 894
 895         if (scaled) {
 896                 double avg_enabled, avg_running;
 897
 898                 avg_enabled = avg_stats(&ps->res_stats[1]);
 899                 avg_running = avg_stats(&ps->res_stats[2]);
 900
 901                 fprintf(stderr, " [%5.2f%%]", 100 * avg_running / avg_enabled);
 902         }
 903         fprintf(stderr, "\n");
 904 }
 905
 906 /*
 907  * Print out the results of a single counter:
 908  * does not use aggregated count in system-wide
 909  */
 910 static void print_counter(struct perf_evsel *counter)
 911 {
 912         u64 ena, run, val;
 913         int cpu;
 914
 915         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 916                 val = counter->counts->cpu[cpu].val;
 917                 ena = counter->counts->cpu[cpu].ena;
 918                 run = counter->counts->cpu[cpu].run;
 919                 if (run == 0 || ena == 0) {
 920                         fprintf(stderr, "CPU%*d%s%*s%s%*s",
 921                                 csv_output ? 0 : -4,
 922                                 evsel_list->cpus->map[cpu], csv_sep,
 923                                 csv_output ? 0 : 18,
 924                                 counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 925                                 csv_sep,
 926                                 csv_output ? 0 : -24,
 927                                 event_name(counter));
 928
 929                         if (counter->cgrp)
 930                                 fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
 931
 932                         fputc('\n', stderr);
 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(stderr, "  (%.2f%%)", 100.0 * run / ena);
 946                 }
 947                 fputc('\n', stderr);
 948         }
 949 }
 950
 951 static void print_stat(int argc, const char **argv)
 952 {
 953         struct perf_evsel *counter;
 954         int i;
 955
 956         fflush(stdout);
 957
 958         if (!csv_output) {
 959                 fprintf(stderr, "\n");
 960                 fprintf(stderr, " Performance counter stats for ");
 961                 if(target_pid == -1 && target_tid == -1) {
 962                         fprintf(stderr, "\'%s", argv[0]);
 963                         for (i = 1; i < argc; i++)
 964                                 fprintf(stderr, " %s", argv[i]);
 965                 } else if (target_pid != -1)
 966                         fprintf(stderr, "process id \'%d", target_pid);
 967                 else
 968                         fprintf(stderr, "thread id \'%d", target_tid);
 969
 970                 fprintf(stderr, "\'");
 971                 if (run_count > 1)
 972                         fprintf(stderr, " (%d runs)", run_count);
 973                 fprintf(stderr, ":\n\n");
 974         }
 975
 976         if (no_aggr) {
 977                 list_for_each_entry(counter, &evsel_list->entries, node)
 978                         print_counter(counter);
 979         } else {
 980                 list_for_each_entry(counter, &evsel_list->entries, node)
 981                         print_counter_aggr(counter);
 982         }
 983
 984         if (!csv_output) {
 985                 if (!null_run)
 986                         fprintf(stderr, "\n");
 987                 fprintf(stderr, " %17.9f seconds time elapsed",
 988                                 avg_stats(&walltime_nsecs_stats)/1e9);
 989                 if (run_count > 1) {
 990                         fprintf(stderr, "                                        ");
 991                         print_noise_pct(stddev_stats(&walltime_nsecs_stats),
 992                                         avg_stats(&walltime_nsecs_stats));
 993                 }
 994                 fprintf(stderr, "\n\n");
 995         }
 996 }
 997
 998 static volatile int signr = -1;
 999
1000 static void skip_signal(int signo)
1001 {
1002         if(child_pid == -1)
1003                 done = 1;
1004
1005         signr = signo;
1006 }
1007
1008 static void sig_atexit(void)
1009 {
1010         if (child_pid != -1)
1011                 kill(child_pid, SIGTERM);
1012
1013         if (signr == -1)
1014                 return;
1015
1016         signal(signr, SIG_DFL);
1017         kill(getpid(), signr);
1018 }
1019
1020 static const char * const stat_usage[] = {
1021         "perf stat [<options>] [<command>]",
1022         NULL
1023 };
1024
1025 static int stat__set_big_num(const struct option *opt __used,
1026                              const char *s __used, int unset)
1027 {
1028         big_num_opt = unset ? 0 : 1;
1029         return 0;
1030 }
1031
1032 static const struct option options[] = {
1033         OPT_CALLBACK('e', "event", &evsel_list, "event",
1034                      "event selector. use 'perf list' to list available events",
1035                      parse_events_option),
1036         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
1037                      "event filter", parse_filter),
1038         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
1039                     "child tasks do not inherit counters"),
1040         OPT_INTEGER('p', "pid", &target_pid,
1041                     "stat events on existing process id"),
1042         OPT_INTEGER('t', "tid", &target_tid,
1043                     "stat events on existing thread id"),
1044         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1045                     "system-wide collection from all CPUs"),
1046         OPT_BOOLEAN('c', "scale", &scale,
1047                     "scale/normalize counters"),
1048         OPT_INCR('v', "verbose", &verbose,
1049                     "be more verbose (show counter open errors, etc)"),
1050         OPT_INTEGER('r', "repeat", &run_count,
1051                     "repeat command and print average + stddev (max: 100)"),
1052         OPT_BOOLEAN('n', "null", &null_run,
1053                     "null run - dont start any counters"),
1054         OPT_INCR('d', "detailed", &detailed_run,
1055                     "detailed run - start a lot of events"),
1056         OPT_BOOLEAN('S', "sync", &sync_run,
1057                     "call sync() before starting a run"),
1058         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
1059                            "print large numbers with thousands\' separators",
1060                            stat__set_big_num),
1061         OPT_STRING('C', "cpu", &cpu_list, "cpu",
1062                     "list of cpus to monitor in system-wide"),
1063         OPT_BOOLEAN('A', "no-aggr", &no_aggr,
1064                     "disable CPU count aggregation"),
1065         OPT_STRING('x', "field-separator", &csv_sep, "separator",
1066                    "print counts with custom separator"),
1067         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
1068                      "monitor event in cgroup name only",
1069                      parse_cgroups),
1070         OPT_END()
1071 };
1072
1073 /*
1074  * Add default attributes, if there were no attributes specified or
1075  * if -d/--detailed, -d -d or -d -d -d is used:
1076  */
1077 static int add_default_attributes(void)
1078 {
1079         struct perf_evsel *pos;
1080         size_t attr_nr = 0;
1081         size_t c;
1082
1083         /* Set attrs if no event is selected and !null_run: */
1084         if (null_run)
1085                 return 0;
1086
1087         if (!evsel_list->nr_entries) {
1088                 for (c = 0; c < ARRAY_SIZE(default_attrs); c++) {
1089                         pos = perf_evsel__new(default_attrs + c, c + attr_nr);
1090                         if (pos == NULL)
1091                                 return -1;
1092                         perf_evlist__add(evsel_list, pos);
1093                 }
1094                 attr_nr += c;
1095         }
1096
1097         /* Detailed events get appended to the event list: */
1098
1099         if (detailed_run <  1)
1100                 return 0;
1101
1102         /* Append detailed run extra attributes: */
1103         for (c = 0; c < ARRAY_SIZE(detailed_attrs); c++) {
1104                 pos = perf_evsel__new(detailed_attrs + c, c + attr_nr);
1105                 if (pos == NULL)
1106                         return -1;
1107                 perf_evlist__add(evsel_list, pos);
1108         }
1109         attr_nr += c;
1110
1111         if (detailed_run < 2)
1112                 return 0;
1113
1114         /* Append very detailed run extra attributes: */
1115         for (c = 0; c < ARRAY_SIZE(very_detailed_attrs); c++) {
1116                 pos = perf_evsel__new(very_detailed_attrs + c, c + attr_nr);
1117                 if (pos == NULL)
1118                         return -1;
1119                 perf_evlist__add(evsel_list, pos);
1120         }
1121
1122         if (detailed_run < 3)
1123                 return 0;
1124
1125         /* Append very, very detailed run extra attributes: */
1126         for (c = 0; c < ARRAY_SIZE(very_very_detailed_attrs); c++) {
1127                 pos = perf_evsel__new(very_very_detailed_attrs + c, c + attr_nr);
1128                 if (pos == NULL)
1129                         return -1;
1130                 perf_evlist__add(evsel_list, pos);
1131         }
1132
1133
1134         return 0;
1135 }
1136
1137 int cmd_stat(int argc, const char **argv, const char *prefix __used)
1138 {
1139         struct perf_evsel *pos;
1140         int status = -ENOMEM;
1141
1142         setlocale(LC_ALL, "");
1143
1144         evsel_list = perf_evlist__new(NULL, NULL);
1145         if (evsel_list == NULL)
1146                 return -ENOMEM;
1147
1148         argc = parse_options(argc, argv, options, stat_usage,
1149                 PARSE_OPT_STOP_AT_NON_OPTION);
1150
1151         if (csv_sep)
1152                 csv_output = true;
1153         else
1154                 csv_sep = DEFAULT_SEPARATOR;
1155
1156         /*
1157          * let the spreadsheet do the pretty-printing
1158          */
1159         if (csv_output) {
1160                 /* User explicitely passed -B? */
1161                 if (big_num_opt == 1) {
1162                         fprintf(stderr, "-B option not supported with -x\n");
1163                         usage_with_options(stat_usage, options);
1164                 } else /* Nope, so disable big number formatting */
1165                         big_num = false;
1166         } else if (big_num_opt == 0) /* User passed --no-big-num */
1167                 big_num = false;
1168
1169         if (!argc && target_pid == -1 && target_tid == -1)
1170                 usage_with_options(stat_usage, options);
1171         if (run_count <= 0)
1172                 usage_with_options(stat_usage, options);
1173
1174         /* no_aggr, cgroup are for system-wide only */
1175         if ((no_aggr || nr_cgroups) && !system_wide) {
1176                 fprintf(stderr, "both cgroup and no-aggregation "
1177                         "modes only available in system-wide mode\n");
1178
1179                 usage_with_options(stat_usage, options);
1180         }
1181
1182         if (add_default_attributes())
1183                 goto out;
1184
1185         if (target_pid != -1)
1186                 target_tid = target_pid;
1187
1188         evsel_list->threads = thread_map__new(target_pid, target_tid);
1189         if (evsel_list->threads == NULL) {
1190                 pr_err("Problems finding threads of monitor\n");
1191                 usage_with_options(stat_usage, options);
1192         }
1193
1194         if (system_wide)
1195                 evsel_list->cpus = cpu_map__new(cpu_list);
1196         else
1197                 evsel_list->cpus = cpu_map__dummy_new();
1198
1199         if (evsel_list->cpus == NULL) {
1200                 perror("failed to parse CPUs map");
1201                 usage_with_options(stat_usage, options);
1202                 return -1;
1203         }
1204
1205         list_for_each_entry(pos, &evsel_list->entries, node) {
1206                 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
1207                     perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
1208                     perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
1209                         goto out_free_fd;
1210         }
1211
1212         /*
1213          * We dont want to block the signals - that would cause
1214          * child tasks to inherit that and Ctrl-C would not work.
1215          * What we want is for Ctrl-C to work in the exec()-ed
1216          * task, but being ignored by perf stat itself:
1217          */
1218         atexit(sig_atexit);
1219         signal(SIGINT,  skip_signal);
1220         signal(SIGALRM, skip_signal);
1221         signal(SIGABRT, skip_signal);
1222
1223         status = 0;
1224         for (run_idx = 0; run_idx < run_count; run_idx++) {
1225                 if (run_count != 1 && verbose)
1226                         fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
1227
1228                 if (sync_run)
1229                         sync();
1230
1231                 status = run_perf_stat(argc, argv);
1232         }
1233
1234         if (status != -1)
1235                 print_stat(argc, argv);
1236 out_free_fd:
1237         list_for_each_entry(pos, &evsel_list->entries, node)
1238                 perf_evsel__free_stat_priv(pos);
1239         perf_evlist__delete_maps(evsel_list);
1240 out:
1241         perf_evlist__delete(evsel_list);
1242         return status;
1243 }