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 static bool                     group                           = false;
 197
 198 static volatile int done = 0;
 199
 200 struct stats
 201 {
 202         double n, mean, M2;
 203 };
 204
 205 struct perf_stat {
 206         struct stats      res_stats[3];
 207 };
 208
 209 static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
 210 {
 211         evsel->priv = zalloc(sizeof(struct perf_stat));
 212         return evsel->priv == NULL ? -ENOMEM : 0;
 213 }
 214
 215 static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
 216 {
 217         free(evsel->priv);
 218         evsel->priv = NULL;
 219 }
 220
 221 static void update_stats(struct stats *stats, u64 val)
 222 {
 223         double delta;
 224
 225         stats->n++;
 226         delta = val - stats->mean;
 227         stats->mean += delta / stats->n;
 228         stats->M2 += delta*(val - stats->mean);
 229 }
 230
 231 static double avg_stats(struct stats *stats)
 232 {
 233         return stats->mean;
 234 }
 235
 236 /*
 237  * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
 238  *
 239  *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
 240  * s^2 = -------------------------------
 241  *                  n - 1
 242  *
 243  * http://en.wikipedia.org/wiki/Stddev
 244  *
 245  * The std dev of the mean is related to the std dev by:
 246  *
 247  *             s
 248  * s_mean = -------
 249  *          sqrt(n)
 250  *
 251  */
 252 static double stddev_stats(struct stats *stats)
 253 {
 254         double variance = stats->M2 / (stats->n - 1);
 255         double variance_mean = variance / stats->n;
 256
 257         return sqrt(variance_mean);
 258 }
 259
 260 struct stats                    runtime_nsecs_stats[MAX_NR_CPUS];
 261 struct stats                    runtime_cycles_stats[MAX_NR_CPUS];
 262 struct stats                    runtime_stalled_cycles_front_stats[MAX_NR_CPUS];
 263 struct stats                    runtime_stalled_cycles_back_stats[MAX_NR_CPUS];
 264 struct stats                    runtime_branches_stats[MAX_NR_CPUS];
 265 struct stats                    runtime_cacherefs_stats[MAX_NR_CPUS];
 266 struct stats                    runtime_l1_dcache_stats[MAX_NR_CPUS];
 267 struct stats                    runtime_l1_icache_stats[MAX_NR_CPUS];
 268 struct stats                    runtime_ll_cache_stats[MAX_NR_CPUS];
 269 struct stats                    runtime_itlb_cache_stats[MAX_NR_CPUS];
 270 struct stats                    runtime_dtlb_cache_stats[MAX_NR_CPUS];
 271 struct stats                    walltime_nsecs_stats;
 272
 273 static int create_perf_stat_counter(struct perf_evsel *evsel)
 274 {
 275         struct perf_event_attr *attr = &evsel->attr;
 276
 277         if (scale)
 278                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 279                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 280
 281         attr->inherit = !no_inherit;
 282
 283         if (system_wide)
 284                 return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, group);
 285
 286         if (target_pid == -1 && target_tid == -1) {
 287                 attr->disabled = 1;
 288                 attr->enable_on_exec = 1;
 289         }
 290
 291         return perf_evsel__open_per_thread(evsel, evsel_list->threads, group);
 292 }
 293
 294 /*
 295  * Does the counter have nsecs as a unit?
 296  */
 297 static inline int nsec_counter(struct perf_evsel *evsel)
 298 {
 299         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
 300             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 301                 return 1;
 302
 303         return 0;
 304 }
 305
 306 /*
 307  * Update various tracking values we maintain to print
 308  * more semantic information such as miss/hit ratios,
 309  * instruction rates, etc:
 310  */
 311 static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
 312 {
 313         if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
 314                 update_stats(&runtime_nsecs_stats[0], count[0]);
 315         else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
 316                 update_stats(&runtime_cycles_stats[0], count[0]);
 317         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
 318                 update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
 319         else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_BACKEND))
 320                 update_stats(&runtime_stalled_cycles_back_stats[0], count[0]);
 321         else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
 322                 update_stats(&runtime_branches_stats[0], count[0]);
 323         else if (perf_evsel__match(counter, HARDWARE, HW_CACHE_REFERENCES))
 324                 update_stats(&runtime_cacherefs_stats[0], count[0]);
 325         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1D))
 326                 update_stats(&runtime_l1_dcache_stats[0], count[0]);
 327         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1I))
 328                 update_stats(&runtime_l1_icache_stats[0], count[0]);
 329         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_LL))
 330                 update_stats(&runtime_ll_cache_stats[0], count[0]);
 331         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_DTLB))
 332                 update_stats(&runtime_dtlb_cache_stats[0], count[0]);
 333         else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_ITLB))
 334                 update_stats(&runtime_itlb_cache_stats[0], count[0]);
 335 }
 336
 337 /*
 338  * Read out the results of a single counter:
 339  * aggregate counts across CPUs in system-wide mode
 340  */
 341 static int read_counter_aggr(struct perf_evsel *counter)
 342 {
 343         struct perf_stat *ps = counter->priv;
 344         u64 *count = counter->counts->aggr.values;
 345         int i;
 346
 347         if (__perf_evsel__read(counter, evsel_list->cpus->nr,
 348                                evsel_list->threads->nr, scale) < 0)
 349                 return -1;
 350
 351         for (i = 0; i < 3; i++)
 352                 update_stats(&ps->res_stats[i], count[i]);
 353
 354         if (verbose) {
 355                 fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 356                         event_name(counter), count[0], count[1], count[2]);
 357         }
 358
 359         /*
 360          * Save the full runtime - to allow normalization during printout:
 361          */
 362         update_shadow_stats(counter, count);
 363
 364         return 0;
 365 }
 366
 367 /*
 368  * Read out the results of a single counter:
 369  * do not aggregate counts across CPUs in system-wide mode
 370  */
 371 static int read_counter(struct perf_evsel *counter)
 372 {
 373         u64 *count;
 374         int cpu;
 375
 376         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 377                 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
 378                         return -1;
 379
 380                 count = counter->counts->cpu[cpu].values;
 381
 382                 update_shadow_stats(counter, count);
 383         }
 384
 385         return 0;
 386 }
 387
 388 static int run_perf_stat(int argc __used, const char **argv)
 389 {
 390         unsigned long long t0, t1;
 391         struct perf_evsel *counter;
 392         int status = 0;
 393         int child_ready_pipe[2], go_pipe[2];
 394         const bool forks = (argc > 0);
 395         char buf;
 396
 397         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 398                 perror("failed to create pipes");
 399                 exit(1);
 400         }
 401
 402         if (forks) {
 403                 if ((child_pid = fork()) < 0)
 404                         perror("failed to fork");
 405
 406                 if (!child_pid) {
 407                         close(child_ready_pipe[0]);
 408                         close(go_pipe[1]);
 409                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 410
 411                         /*
 412                          * Do a dummy execvp to get the PLT entry resolved,
 413                          * so we avoid the resolver overhead on the real
 414                          * execvp call.
 415                          */
 416                         execvp("", (char **)argv);
 417
 418                         /*
 419                          * Tell the parent we're ready to go
 420                          */
 421                         close(child_ready_pipe[1]);
 422
 423                         /*
 424                          * Wait until the parent tells us to go.
 425                          */
 426                         if (read(go_pipe[0], &buf, 1) == -1)
 427                                 perror("unable to read pipe");
 428
 429                         execvp(argv[0], (char **)argv);
 430
 431                         perror(argv[0]);
 432                         exit(-1);
 433                 }
 434
 435                 if (target_tid == -1 && target_pid == -1 && !system_wide)
 436                         evsel_list->threads->map[0] = child_pid;
 437
 438                 /*
 439                  * Wait for the child to be ready to exec.
 440                  */
 441                 close(child_ready_pipe[1]);
 442                 close(go_pipe[0]);
 443                 if (read(child_ready_pipe[0], &buf, 1) == -1)
 444                         perror("unable to read pipe");
 445                 close(child_ready_pipe[0]);
 446         }
 447
 448         list_for_each_entry(counter, &evsel_list->entries, node) {
 449                 if (create_perf_stat_counter(counter) < 0) {
 450                         if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
 451                                 if (verbose)
 452                                         ui__warning("%s event is not supported by the kernel.\n",
 453                                                     event_name(counter));
 454                                 counter->supported = false;
 455                                 continue;
 456                         }
 457
 458                         if (errno == EPERM || errno == EACCES) {
 459                                 error("You may not have permission to collect %sstats.\n"
 460                                       "\t Consider tweaking"
 461                                       " /proc/sys/kernel/perf_event_paranoid or running as root.",
 462                                       system_wide ? "system-wide " : "");
 463                         } else {
 464                                 error("open_counter returned with %d (%s). "
 465                                       "/bin/dmesg may provide additional information.\n",
 466                                        errno, strerror(errno));
 467                         }
 468                         if (child_pid != -1)
 469                                 kill(child_pid, SIGTERM);
 470                         die("Not all events could be opened.\n");
 471                         return -1;
 472                 }
 473                 counter->supported = true;
 474         }
 475
 476         if (perf_evlist__set_filters(evsel_list)) {
 477                 error("failed to set filter with %d (%s)\n", errno,
 478                         strerror(errno));
 479                 return -1;
 480         }
 481
 482         /*
 483          * Enable counters and exec the command:
 484          */
 485         t0 = rdclock();
 486
 487         if (forks) {
 488                 close(go_pipe[1]);
 489                 wait(&status);
 490         } else {
 491                 while(!done) sleep(1);
 492         }
 493
 494         t1 = rdclock();
 495
 496         update_stats(&walltime_nsecs_stats, t1 - t0);
 497
 498         if (no_aggr) {
 499                 list_for_each_entry(counter, &evsel_list->entries, node) {
 500                         read_counter(counter);
 501                         perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
 502                 }
 503         } else {
 504                 list_for_each_entry(counter, &evsel_list->entries, node) {
 505                         read_counter_aggr(counter);
 506                         perf_evsel__close_fd(counter, evsel_list->cpus->nr,
 507                                              evsel_list->threads->nr);
 508                 }
 509         }
 510
 511         return WEXITSTATUS(status);
 512 }
 513
 514 static void print_noise_pct(double total, double avg)
 515 {
 516         double pct = 0.0;
 517
 518         if (avg)
 519                 pct = 100.0*total/avg;
 520
 521         if (csv_output)
 522                 fprintf(stderr, "%s%.2f%%", csv_sep, pct);
 523         else
 524                 fprintf(stderr, "  ( +-%6.2f%% )", pct);
 525 }
 526
 527 static void print_noise(struct perf_evsel *evsel, double avg)
 528 {
 529         struct perf_stat *ps;
 530
 531         if (run_count == 1)
 532                 return;
 533
 534         ps = evsel->priv;
 535         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
 536 }
 537
 538 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
 539 {
 540         double msecs = avg / 1e6;
 541         char cpustr[16] = { '\0', };
 542         const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-25s";
 543
 544         if (no_aggr)
 545                 sprintf(cpustr, "CPU%*d%s",
 546                         csv_output ? 0 : -4,
 547                         evsel_list->cpus->map[cpu], csv_sep);
 548
 549         fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
 550
 551         if (evsel->cgrp)
 552                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
 553
 554         if (csv_output)
 555                 return;
 556
 557         if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 558                 fprintf(stderr, " # %8.3f CPUs utilized          ", avg / avg_stats(&walltime_nsecs_stats));
 559 }
 560
 561 static void print_stalled_cycles_frontend(int cpu, struct perf_evsel *evsel __used, double avg)
 562 {
 563         double total, ratio = 0.0;
 564         const char *color;
 565
 566         total = avg_stats(&runtime_cycles_stats[cpu]);
 567
 568         if (total)
 569                 ratio = avg / total * 100.0;
 570
 571         color = PERF_COLOR_NORMAL;
 572         if (ratio > 50.0)
 573                 color = PERF_COLOR_RED;
 574         else if (ratio > 30.0)
 575                 color = PERF_COLOR_MAGENTA;
 576         else if (ratio > 10.0)
 577                 color = PERF_COLOR_YELLOW;
 578
 579         fprintf(stderr, " #  ");
 580         color_fprintf(stderr, color, "%6.2f%%", ratio);
 581         fprintf(stderr, " frontend cycles idle   ");
 582 }
 583
 584 static void print_stalled_cycles_backend(int cpu, struct perf_evsel *evsel __used, double avg)
 585 {
 586         double total, ratio = 0.0;
 587         const char *color;
 588
 589         total = avg_stats(&runtime_cycles_stats[cpu]);
 590
 591         if (total)
 592                 ratio = avg / total * 100.0;
 593
 594         color = PERF_COLOR_NORMAL;
 595         if (ratio > 75.0)
 596                 color = PERF_COLOR_RED;
 597         else if (ratio > 50.0)
 598                 color = PERF_COLOR_MAGENTA;
 599         else if (ratio > 20.0)
 600                 color = PERF_COLOR_YELLOW;
 601
 602         fprintf(stderr, " #  ");
 603         color_fprintf(stderr, color, "%6.2f%%", ratio);
 604         fprintf(stderr, " backend  cycles idle   ");
 605 }
 606
 607 static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 608 {
 609         double total, ratio = 0.0;
 610         const char *color;
 611
 612         total = avg_stats(&runtime_branches_stats[cpu]);
 613
 614         if (total)
 615                 ratio = avg / total * 100.0;
 616
 617         color = PERF_COLOR_NORMAL;
 618         if (ratio > 20.0)
 619                 color = PERF_COLOR_RED;
 620         else if (ratio > 10.0)
 621                 color = PERF_COLOR_MAGENTA;
 622         else if (ratio > 5.0)
 623                 color = PERF_COLOR_YELLOW;
 624
 625         fprintf(stderr, " #  ");
 626         color_fprintf(stderr, color, "%6.2f%%", ratio);
 627         fprintf(stderr, " of all branches        ");
 628 }
 629
 630 static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 631 {
 632         double total, ratio = 0.0;
 633         const char *color;
 634
 635         total = avg_stats(&runtime_l1_dcache_stats[cpu]);
 636
 637         if (total)
 638                 ratio = avg / total * 100.0;
 639
 640         color = PERF_COLOR_NORMAL;
 641         if (ratio > 20.0)
 642                 color = PERF_COLOR_RED;
 643         else if (ratio > 10.0)
 644                 color = PERF_COLOR_MAGENTA;
 645         else if (ratio > 5.0)
 646                 color = PERF_COLOR_YELLOW;
 647
 648         fprintf(stderr, " #  ");
 649         color_fprintf(stderr, color, "%6.2f%%", ratio);
 650         fprintf(stderr, " of all L1-dcache hits  ");
 651 }
 652
 653 static void print_l1_icache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 654 {
 655         double total, ratio = 0.0;
 656         const char *color;
 657
 658         total = avg_stats(&runtime_l1_icache_stats[cpu]);
 659
 660         if (total)
 661                 ratio = avg / total * 100.0;
 662
 663         color = PERF_COLOR_NORMAL;
 664         if (ratio > 20.0)
 665                 color = PERF_COLOR_RED;
 666         else if (ratio > 10.0)
 667                 color = PERF_COLOR_MAGENTA;
 668         else if (ratio > 5.0)
 669                 color = PERF_COLOR_YELLOW;
 670
 671         fprintf(stderr, " #  ");
 672         color_fprintf(stderr, color, "%6.2f%%", ratio);
 673         fprintf(stderr, " of all L1-icache hits  ");
 674 }
 675
 676 static void print_dtlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 677 {
 678         double total, ratio = 0.0;
 679         const char *color;
 680
 681         total = avg_stats(&runtime_dtlb_cache_stats[cpu]);
 682
 683         if (total)
 684                 ratio = avg / total * 100.0;
 685
 686         color = PERF_COLOR_NORMAL;
 687         if (ratio > 20.0)
 688                 color = PERF_COLOR_RED;
 689         else if (ratio > 10.0)
 690                 color = PERF_COLOR_MAGENTA;
 691         else if (ratio > 5.0)
 692                 color = PERF_COLOR_YELLOW;
 693
 694         fprintf(stderr, " #  ");
 695         color_fprintf(stderr, color, "%6.2f%%", ratio);
 696         fprintf(stderr, " of all dTLB cache hits ");
 697 }
 698
 699 static void print_itlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 700 {
 701         double total, ratio = 0.0;
 702         const char *color;
 703
 704         total = avg_stats(&runtime_itlb_cache_stats[cpu]);
 705
 706         if (total)
 707                 ratio = avg / total * 100.0;
 708
 709         color = PERF_COLOR_NORMAL;
 710         if (ratio > 20.0)
 711                 color = PERF_COLOR_RED;
 712         else if (ratio > 10.0)
 713                 color = PERF_COLOR_MAGENTA;
 714         else if (ratio > 5.0)
 715                 color = PERF_COLOR_YELLOW;
 716
 717         fprintf(stderr, " #  ");
 718         color_fprintf(stderr, color, "%6.2f%%", ratio);
 719         fprintf(stderr, " of all iTLB cache hits ");
 720 }
 721
 722 static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
 723 {
 724         double total, ratio = 0.0;
 725         const char *color;
 726
 727         total = avg_stats(&runtime_ll_cache_stats[cpu]);
 728
 729         if (total)
 730                 ratio = avg / total * 100.0;
 731
 732         color = PERF_COLOR_NORMAL;
 733         if (ratio > 20.0)
 734                 color = PERF_COLOR_RED;
 735         else if (ratio > 10.0)
 736                 color = PERF_COLOR_MAGENTA;
 737         else if (ratio > 5.0)
 738                 color = PERF_COLOR_YELLOW;
 739
 740         fprintf(stderr, " #  ");
 741         color_fprintf(stderr, color, "%6.2f%%", ratio);
 742         fprintf(stderr, " of all LL-cache hits   ");
 743 }
 744
 745 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 746 {
 747         double total, ratio = 0.0;
 748         char cpustr[16] = { '\0', };
 749         const char *fmt;
 750
 751         if (csv_output)
 752                 fmt = "%s%.0f%s%s";
 753         else if (big_num)
 754                 fmt = "%s%'18.0f%s%-25s";
 755         else
 756                 fmt = "%s%18.0f%s%-25s";
 757
 758         if (no_aggr)
 759                 sprintf(cpustr, "CPU%*d%s",
 760                         csv_output ? 0 : -4,
 761                         evsel_list->cpus->map[cpu], csv_sep);
 762         else
 763                 cpu = 0;
 764
 765         fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
 766
 767         if (evsel->cgrp)
 768                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
 769
 770         if (csv_output)
 771                 return;
 772
 773         if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
 774                 total = avg_stats(&runtime_cycles_stats[cpu]);
 775
 776                 if (total)
 777                         ratio = avg / total;
 778
 779                 fprintf(stderr, " #   %5.2f  insns per cycle        ", ratio);
 780
 781                 total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
 782                 total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
 783
 784                 if (total && avg) {
 785                         ratio = total / avg;
 786                         fprintf(stderr, "\n                                             #   %5.2f  stalled cycles per insn", ratio);
 787                 }
 788
 789         } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
 790                         runtime_branches_stats[cpu].n != 0) {
 791                 print_branch_misses(cpu, evsel, avg);
 792         } else if (
 793                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 794                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1D |
 795                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 796                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 797                         runtime_l1_dcache_stats[cpu].n != 0) {
 798                 print_l1_dcache_misses(cpu, evsel, avg);
 799         } else if (
 800                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 801                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1I |
 802                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 803                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 804                         runtime_l1_icache_stats[cpu].n != 0) {
 805                 print_l1_icache_misses(cpu, evsel, avg);
 806         } else if (
 807                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 808                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_DTLB |
 809                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 810                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 811                         runtime_dtlb_cache_stats[cpu].n != 0) {
 812                 print_dtlb_cache_misses(cpu, evsel, avg);
 813         } else if (
 814                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 815                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_ITLB |
 816                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 817                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 818                         runtime_itlb_cache_stats[cpu].n != 0) {
 819                 print_itlb_cache_misses(cpu, evsel, avg);
 820         } else if (
 821                 evsel->attr.type == PERF_TYPE_HW_CACHE &&
 822                 evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_LL |
 823                                         ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
 824                                         ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
 825                         runtime_ll_cache_stats[cpu].n != 0) {
 826                 print_ll_cache_misses(cpu, evsel, avg);
 827         } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) &&
 828                         runtime_cacherefs_stats[cpu].n != 0) {
 829                 total = avg_stats(&runtime_cacherefs_stats[cpu]);
 830
 831                 if (total)
 832                         ratio = avg * 100 / total;
 833
 834                 fprintf(stderr, " # %8.3f %% of all cache refs    ", ratio);
 835
 836         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND)) {
 837                 print_stalled_cycles_frontend(cpu, evsel, avg);
 838         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_BACKEND)) {
 839                 print_stalled_cycles_backend(cpu, evsel, avg);
 840         } else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
 841                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 842
 843                 if (total)
 844                         ratio = 1.0 * avg / total;
 845
 846                 fprintf(stderr, " # %8.3f GHz                    ", ratio);
 847         } else if (runtime_nsecs_stats[cpu].n != 0) {
 848                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 849
 850                 if (total)
 851                         ratio = 1000.0 * avg / total;
 852
 853                 fprintf(stderr, " # %8.3f M/sec                  ", ratio);
 854         } else {
 855                 fprintf(stderr, "                                   ");
 856         }
 857 }
 858
 859 /*
 860  * Print out the results of a single counter:
 861  * aggregated counts in system-wide mode
 862  */
 863 static void print_counter_aggr(struct perf_evsel *counter)
 864 {
 865         struct perf_stat *ps = counter->priv;
 866         double avg = avg_stats(&ps->res_stats[0]);
 867         int scaled = counter->counts->scaled;
 868
 869         if (scaled == -1) {
 870                 fprintf(stderr, "%*s%s%*s",
 871                         csv_output ? 0 : 18,
 872                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 873                         csv_sep,
 874                         csv_output ? 0 : -24,
 875                         event_name(counter));
 876
 877                 if (counter->cgrp)
 878                         fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
 879
 880                 fputc('\n', stderr);
 881                 return;
 882         }
 883
 884         if (nsec_counter(counter))
 885                 nsec_printout(-1, counter, avg);
 886         else
 887                 abs_printout(-1, counter, avg);
 888
 889         print_noise(counter, avg);
 890
 891         if (csv_output) {
 892                 fputc('\n', stderr);
 893                 return;
 894         }
 895
 896         if (scaled) {
 897                 double avg_enabled, avg_running;
 898
 899                 avg_enabled = avg_stats(&ps->res_stats[1]);
 900                 avg_running = avg_stats(&ps->res_stats[2]);
 901
 902                 fprintf(stderr, " [%5.2f%%]", 100 * avg_running / avg_enabled);
 903         }
 904         fprintf(stderr, "\n");
 905 }
 906
 907 /*
 908  * Print out the results of a single counter:
 909  * does not use aggregated count in system-wide
 910  */
 911 static void print_counter(struct perf_evsel *counter)
 912 {
 913         u64 ena, run, val;
 914         int cpu;
 915
 916         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 917                 val = counter->counts->cpu[cpu].val;
 918                 ena = counter->counts->cpu[cpu].ena;
 919                 run = counter->counts->cpu[cpu].run;
 920                 if (run == 0 || ena == 0) {
 921                         fprintf(stderr, "CPU%*d%s%*s%s%*s",
 922                                 csv_output ? 0 : -4,
 923                                 evsel_list->cpus->map[cpu], csv_sep,
 924                                 csv_output ? 0 : 18,
 925                                 counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 926                                 csv_sep,
 927                                 csv_output ? 0 : -24,
 928                                 event_name(counter));
 929
 930                         if (counter->cgrp)
 931                                 fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
 932
 933                         fputc('\n', stderr);
 934                         continue;
 935                 }
 936
 937                 if (nsec_counter(counter))
 938                         nsec_printout(cpu, counter, val);
 939                 else
 940                         abs_printout(cpu, counter, val);
 941
 942                 if (!csv_output) {
 943                         print_noise(counter, 1.0);
 944
 945                         if (run != ena)
 946                                 fprintf(stderr, "  (%.2f%%)", 100.0 * run / ena);
 947                 }
 948                 fputc('\n', stderr);
 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(stderr, "\n");
 961                 fprintf(stderr, " Performance counter stats for ");
 962                 if(target_pid == -1 && target_tid == -1) {
 963                         fprintf(stderr, "\'%s", argv[0]);
 964                         for (i = 1; i < argc; i++)
 965                                 fprintf(stderr, " %s", argv[i]);
 966                 } else if (target_pid != -1)
 967                         fprintf(stderr, "process id \'%d", target_pid);
 968                 else
 969                         fprintf(stderr, "thread id \'%d", target_tid);
 970
 971                 fprintf(stderr, "\'");
 972                 if (run_count > 1)
 973                         fprintf(stderr, " (%d runs)", run_count);
 974                 fprintf(stderr, ":\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(stderr, "\n");
 988                 fprintf(stderr, " %17.9f seconds time elapsed",
 989                                 avg_stats(&walltime_nsecs_stats)/1e9);
 990                 if (run_count > 1) {
 991                         fprintf(stderr, "                                        ");
 992                         print_noise_pct(stddev_stats(&walltime_nsecs_stats),
 993                                         avg_stats(&walltime_nsecs_stats));
 994                 }
 995                 fprintf(stderr, "\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 __used,
1027                              const char *s __used, int unset)
1028 {
1029         big_num_opt = unset ? 0 : 1;
1030         return 0;
1031 }
1032
1033 static const struct option options[] = {
1034         OPT_CALLBACK('e', "event", &evsel_list, "event",
1035                      "event selector. use 'perf list' to list available events",
1036                      parse_events_option),
1037         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
1038                      "event filter", parse_filter),
1039         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
1040                     "child tasks do not inherit counters"),
1041         OPT_INTEGER('p', "pid", &target_pid,
1042                     "stat events on existing process id"),
1043         OPT_INTEGER('t', "tid", &target_tid,
1044                     "stat events on existing thread id"),
1045         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1046                     "system-wide collection from all CPUs"),
1047         OPT_BOOLEAN('g', "group", &group,
1048                     "put the counters into a counter group"),
1049         OPT_BOOLEAN('c', "scale", &scale,
1050                     "scale/normalize counters"),
1051         OPT_INCR('v', "verbose", &verbose,
1052                     "be more verbose (show counter open errors, etc)"),
1053         OPT_INTEGER('r', "repeat", &run_count,
1054                     "repeat command and print average + stddev (max: 100)"),
1055         OPT_BOOLEAN('n', "null", &null_run,
1056                     "null run - dont start any counters"),
1057         OPT_INCR('d', "detailed", &detailed_run,
1058                     "detailed run - start a lot of events"),
1059         OPT_BOOLEAN('S', "sync", &sync_run,
1060                     "call sync() before starting a run"),
1061         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
1062                            "print large numbers with thousands\' separators",
1063                            stat__set_big_num),
1064         OPT_STRING('C', "cpu", &cpu_list, "cpu",
1065                     "list of cpus to monitor in system-wide"),
1066         OPT_BOOLEAN('A', "no-aggr", &no_aggr,
1067                     "disable CPU count aggregation"),
1068         OPT_STRING('x', "field-separator", &csv_sep, "separator",
1069                    "print counts with custom separator"),
1070         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
1071                      "monitor event in cgroup name only",
1072                      parse_cgroups),
1073         OPT_END()
1074 };
1075
1076 /*
1077  * Add default attributes, if there were no attributes specified or
1078  * if -d/--detailed, -d -d or -d -d -d is used:
1079  */
1080 static int add_default_attributes(void)
1081 {
1082         struct perf_evsel *pos;
1083         size_t attr_nr = 0;
1084         size_t c;
1085
1086         /* Set attrs if no event is selected and !null_run: */
1087         if (null_run)
1088                 return 0;
1089
1090         if (!evsel_list->nr_entries) {
1091                 for (c = 0; c < ARRAY_SIZE(default_attrs); c++) {
1092                         pos = perf_evsel__new(default_attrs + c, c + attr_nr);
1093                         if (pos == NULL)
1094                                 return -1;
1095                         perf_evlist__add(evsel_list, pos);
1096                 }
1097                 attr_nr += c;
1098         }
1099
1100         /* Detailed events get appended to the event list: */
1101
1102         if (detailed_run <  1)
1103                 return 0;
1104
1105         /* Append detailed run extra attributes: */
1106         for (c = 0; c < ARRAY_SIZE(detailed_attrs); c++) {
1107                 pos = perf_evsel__new(detailed_attrs + c, c + attr_nr);
1108                 if (pos == NULL)
1109                         return -1;
1110                 perf_evlist__add(evsel_list, pos);
1111         }
1112         attr_nr += c;
1113
1114         if (detailed_run < 2)
1115                 return 0;
1116
1117         /* Append very detailed run extra attributes: */
1118         for (c = 0; c < ARRAY_SIZE(very_detailed_attrs); c++) {
1119                 pos = perf_evsel__new(very_detailed_attrs + c, c + attr_nr);
1120                 if (pos == NULL)
1121                         return -1;
1122                 perf_evlist__add(evsel_list, pos);
1123         }
1124
1125         if (detailed_run < 3)
1126                 return 0;
1127
1128         /* Append very, very detailed run extra attributes: */
1129         for (c = 0; c < ARRAY_SIZE(very_very_detailed_attrs); c++) {
1130                 pos = perf_evsel__new(very_very_detailed_attrs + c, c + attr_nr);
1131                 if (pos == NULL)
1132                         return -1;
1133                 perf_evlist__add(evsel_list, pos);
1134         }
1135
1136
1137         return 0;
1138 }
1139
1140 int cmd_stat(int argc, const char **argv, const char *prefix __used)
1141 {
1142         struct perf_evsel *pos;
1143         int status = -ENOMEM;
1144
1145         setlocale(LC_ALL, "");
1146
1147         evsel_list = perf_evlist__new(NULL, NULL);
1148         if (evsel_list == NULL)
1149                 return -ENOMEM;
1150
1151         argc = parse_options(argc, argv, options, stat_usage,
1152                 PARSE_OPT_STOP_AT_NON_OPTION);
1153
1154         if (csv_sep)
1155                 csv_output = true;
1156         else
1157                 csv_sep = DEFAULT_SEPARATOR;
1158
1159         /*
1160          * let the spreadsheet do the pretty-printing
1161          */
1162         if (csv_output) {
1163                 /* User explicitely passed -B? */
1164                 if (big_num_opt == 1) {
1165                         fprintf(stderr, "-B option not supported with -x\n");
1166                         usage_with_options(stat_usage, options);
1167                 } else /* Nope, so disable big number formatting */
1168                         big_num = false;
1169         } else if (big_num_opt == 0) /* User passed --no-big-num */
1170                 big_num = false;
1171
1172         if (!argc && target_pid == -1 && target_tid == -1)
1173                 usage_with_options(stat_usage, options);
1174         if (run_count <= 0)
1175                 usage_with_options(stat_usage, options);
1176
1177         /* no_aggr, cgroup are for system-wide only */
1178         if ((no_aggr || nr_cgroups) && !system_wide) {
1179                 fprintf(stderr, "both cgroup and no-aggregation "
1180                         "modes only available in system-wide mode\n");
1181
1182                 usage_with_options(stat_usage, options);
1183         }
1184
1185         if (add_default_attributes())
1186                 goto out;
1187
1188         if (target_pid != -1)
1189                 target_tid = target_pid;
1190
1191         evsel_list->threads = thread_map__new(target_pid, target_tid);
1192         if (evsel_list->threads == NULL) {
1193                 pr_err("Problems finding threads of monitor\n");
1194                 usage_with_options(stat_usage, options);
1195         }
1196
1197         if (system_wide)
1198                 evsel_list->cpus = cpu_map__new(cpu_list);
1199         else
1200                 evsel_list->cpus = cpu_map__dummy_new();
1201
1202         if (evsel_list->cpus == NULL) {
1203                 perror("failed to parse CPUs map");
1204                 usage_with_options(stat_usage, options);
1205                 return -1;
1206         }
1207
1208         list_for_each_entry(pos, &evsel_list->entries, node) {
1209                 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
1210                     perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
1211                     perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
1212                         goto out_free_fd;
1213         }
1214
1215         /*
1216          * We dont want to block the signals - that would cause
1217          * child tasks to inherit that and Ctrl-C would not work.
1218          * What we want is for Ctrl-C to work in the exec()-ed
1219          * task, but being ignored by perf stat itself:
1220          */
1221         atexit(sig_atexit);
1222         signal(SIGINT,  skip_signal);
1223         signal(SIGALRM, skip_signal);
1224         signal(SIGABRT, skip_signal);
1225
1226         status = 0;
1227         for (run_idx = 0; run_idx < run_count; run_idx++) {
1228                 if (run_count != 1 && verbose)
1229                         fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
1230
1231                 if (sync_run)
1232                         sync();
1233
1234                 status = run_perf_stat(argc, argv);
1235         }
1236
1237         if (status != -1)
1238                 print_stat(argc, argv);
1239 out_free_fd:
1240         list_for_each_entry(pos, &evsel_list->entries, node)
1241                 perf_evsel__free_stat_priv(pos);
1242         perf_evlist__delete_maps(evsel_list);
1243 out:
1244         perf_evlist__delete(evsel_list);
1245         return status;
1246 }