tools/perf/builtin-stat.c

   1 /*
   2  * builtin-stat.c
   3  *
   4  * Builtin stat command: Give a precise performance counters summary
   5  * overview about any workload, CPU or specific PID.
   6  *
   7  * Sample output:
   8
   9    $ perf stat ~/hackbench 10
  10    Time: 0.104
  11
  12     Performance counter stats for '/home/mingo/hackbench':
  13
  14        1255.538611  task clock ticks     #      10.143 CPU utilization factor
  15              54011  context switches     #       0.043 M/sec
  16                385  CPU migrations       #       0.000 M/sec
  17              17755  pagefaults           #       0.014 M/sec
  18         3808323185  CPU cycles           #    3033.219 M/sec
  19         1575111190  instructions         #    1254.530 M/sec
  20           17367895  cache references     #      13.833 M/sec
  21            7674421  cache misses         #       6.112 M/sec
  22
  23     Wall-clock time elapsed:   123.786620 msecs
  24
  25  *
  26  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  27  *
  28  * Improvements and fixes by:
  29  *
  30  *   Arjan van de Ven <arjan@linux.intel.com>
  31  *   Yanmin Zhang <yanmin.zhang@intel.com>
  32  *   Wu Fengguang <fengguang.wu@intel.com>
  33  *   Mike Galbraith <efault@gmx.de>
  34  *   Paul Mackerras <paulus@samba.org>
  35  *   Jaswinder Singh Rajput <jaswinder@kernel.org>
  36  *
  37  * Released under the GPL v2. (and only v2, not any later version)
  38  */
  39
  40 #include "perf.h"
  41 #include "builtin.h"
  42 #include "util/util.h"
  43 #include "util/parse-options.h"
  44 #include "util/parse-events.h"
  45 #include "util/event.h"
  46 #include "util/evlist.h"
  47 #include "util/evsel.h"
  48 #include "util/debug.h"
  49 #include "util/header.h"
  50 #include "util/cpumap.h"
  51 #include "util/thread.h"
  52 #include "util/thread_map.h"
  53
  54 #include <sys/prctl.h>
  55 #include <math.h>
  56 #include <locale.h>
  57
  58 #define DEFAULT_SEPARATOR       " "
  59
  60 static struct perf_event_attr default_attrs[] = {
  61
  62   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
  63   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
  64   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
  65   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
  66
  67   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
  68   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
  69   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
  70   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
  71   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES        },
  72   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES            },
  73
  74 };
  75
  76 struct perf_evlist              *evsel_list;
  77
  78 static bool                     system_wide                     =  false;
  79 static int                      run_idx                         =  0;
  80
  81 static int                      run_count                       =  1;
  82 static bool                     no_inherit                      = false;
  83 static bool                     scale                           =  true;
  84 static bool                     no_aggr                         = false;
  85 static pid_t                    target_pid                      = -1;
  86 static pid_t                    target_tid                      = -1;
  87 static pid_t                    child_pid                       = -1;
  88 static bool                     null_run                        =  false;
  89 static bool                     big_num                         =  true;
  90 static int                      big_num_opt                     =  -1;
  91 static const char               *cpu_list;
  92 static const char               *csv_sep                        = NULL;
  93 static bool                     csv_output                      = false;
  94
  95 static volatile int done = 0;
  96
  97 struct stats
  98 {
  99         double n, mean, M2;
 100 };
 101
 102 struct perf_stat {
 103         struct stats      res_stats[3];
 104 };
 105
 106 static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
 107 {
 108         evsel->priv = zalloc(sizeof(struct perf_stat));
 109         return evsel->priv == NULL ? -ENOMEM : 0;
 110 }
 111
 112 static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
 113 {
 114         free(evsel->priv);
 115         evsel->priv = NULL;
 116 }
 117
 118 static void update_stats(struct stats *stats, u64 val)
 119 {
 120         double delta;
 121
 122         stats->n++;
 123         delta = val - stats->mean;
 124         stats->mean += delta / stats->n;
 125         stats->M2 += delta*(val - stats->mean);
 126 }
 127
 128 static double avg_stats(struct stats *stats)
 129 {
 130         return stats->mean;
 131 }
 132
 133 /*
 134  * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
 135  *
 136  *       (\Sum n_i^2) - ((\Sum n_i)^2)/n
 137  * s^2 = -------------------------------
 138  *                  n - 1
 139  *
 140  * http://en.wikipedia.org/wiki/Stddev
 141  *
 142  * The std dev of the mean is related to the std dev by:
 143  *
 144  *             s
 145  * s_mean = -------
 146  *          sqrt(n)
 147  *
 148  */
 149 static double stddev_stats(struct stats *stats)
 150 {
 151         double variance = stats->M2 / (stats->n - 1);
 152         double variance_mean = variance / stats->n;
 153
 154         return sqrt(variance_mean);
 155 }
 156
 157 struct stats                    runtime_nsecs_stats[MAX_NR_CPUS];
 158 struct stats                    runtime_cycles_stats[MAX_NR_CPUS];
 159 struct stats                    runtime_branches_stats[MAX_NR_CPUS];
 160 struct stats                    walltime_nsecs_stats;
 161
 162 static int create_perf_stat_counter(struct perf_evsel *evsel)
 163 {
 164         struct perf_event_attr *attr = &evsel->attr;
 165
 166         if (scale)
 167                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 168                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 169
 170         attr->inherit = !no_inherit;
 171
 172         if (system_wide)
 173                 return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, false);
 174
 175         if (target_pid == -1 && target_tid == -1) {
 176                 attr->disabled = 1;
 177                 attr->enable_on_exec = 1;
 178         }
 179
 180         return perf_evsel__open_per_thread(evsel, evsel_list->threads, false);
 181 }
 182
 183 /*
 184  * Does the counter have nsecs as a unit?
 185  */
 186 static inline int nsec_counter(struct perf_evsel *evsel)
 187 {
 188         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
 189             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 190                 return 1;
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * Read out the results of a single counter:
 197  * aggregate counts across CPUs in system-wide mode
 198  */
 199 static int read_counter_aggr(struct perf_evsel *counter)
 200 {
 201         struct perf_stat *ps = counter->priv;
 202         u64 *count = counter->counts->aggr.values;
 203         int i;
 204
 205         if (__perf_evsel__read(counter, evsel_list->cpus->nr,
 206                                evsel_list->threads->nr, scale) < 0)
 207                 return -1;
 208
 209         for (i = 0; i < 3; i++)
 210                 update_stats(&ps->res_stats[i], count[i]);
 211
 212         if (verbose) {
 213                 fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 214                         event_name(counter), count[0], count[1], count[2]);
 215         }
 216
 217         /*
 218          * Save the full runtime - to allow normalization during printout:
 219          */
 220         if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
 221                 update_stats(&runtime_nsecs_stats[0], count[0]);
 222         if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
 223                 update_stats(&runtime_cycles_stats[0], count[0]);
 224         if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
 225                 update_stats(&runtime_branches_stats[0], count[0]);
 226
 227         return 0;
 228 }
 229
 230 /*
 231  * Read out the results of a single counter:
 232  * do not aggregate counts across CPUs in system-wide mode
 233  */
 234 static int read_counter(struct perf_evsel *counter)
 235 {
 236         u64 *count;
 237         int cpu;
 238
 239         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 240                 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
 241                         return -1;
 242
 243                 count = counter->counts->cpu[cpu].values;
 244
 245                 if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
 246                         update_stats(&runtime_nsecs_stats[cpu], count[0]);
 247                 if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
 248                         update_stats(&runtime_cycles_stats[cpu], count[0]);
 249                 if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
 250                         update_stats(&runtime_branches_stats[cpu], count[0]);
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int run_perf_stat(int argc __used, const char **argv)
 257 {
 258         unsigned long long t0, t1;
 259         struct perf_evsel *counter;
 260         int status = 0;
 261         int child_ready_pipe[2], go_pipe[2];
 262         const bool forks = (argc > 0);
 263         char buf;
 264
 265         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 266                 perror("failed to create pipes");
 267                 exit(1);
 268         }
 269
 270         if (forks) {
 271                 if ((child_pid = fork()) < 0)
 272                         perror("failed to fork");
 273
 274                 if (!child_pid) {
 275                         close(child_ready_pipe[0]);
 276                         close(go_pipe[1]);
 277                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 278
 279                         /*
 280                          * Do a dummy execvp to get the PLT entry resolved,
 281                          * so we avoid the resolver overhead on the real
 282                          * execvp call.
 283                          */
 284                         execvp("", (char **)argv);
 285
 286                         /*
 287                          * Tell the parent we're ready to go
 288                          */
 289                         close(child_ready_pipe[1]);
 290
 291                         /*
 292                          * Wait until the parent tells us to go.
 293                          */
 294                         if (read(go_pipe[0], &buf, 1) == -1)
 295                                 perror("unable to read pipe");
 296
 297                         execvp(argv[0], (char **)argv);
 298
 299                         perror(argv[0]);
 300                         exit(-1);
 301                 }
 302
 303                 if (target_tid == -1 && target_pid == -1 && !system_wide)
 304                         evsel_list->threads->map[0] = child_pid;
 305
 306                 /*
 307                  * Wait for the child to be ready to exec.
 308                  */
 309                 close(child_ready_pipe[1]);
 310                 close(go_pipe[0]);
 311                 if (read(child_ready_pipe[0], &buf, 1) == -1)
 312                         perror("unable to read pipe");
 313                 close(child_ready_pipe[0]);
 314         }
 315
 316         list_for_each_entry(counter, &evsel_list->entries, node) {
 317                 if (create_perf_stat_counter(counter) < 0) {
 318                         if (errno == -EPERM || errno == -EACCES) {
 319                                 error("You may not have permission to collect %sstats.\n"
 320                                       "\t Consider tweaking"
 321                                       " /proc/sys/kernel/perf_event_paranoid or running as root.",
 322                                       system_wide ? "system-wide " : "");
 323                         } else if (errno == ENOENT) {
 324                                 error("%s event is not supported. ", event_name(counter));
 325                         } else {
 326                                 error("open_counter returned with %d (%s). "
 327                                       "/bin/dmesg may provide additional information.\n",
 328                                        errno, strerror(errno));
 329                         }
 330                         if (child_pid != -1)
 331                                 kill(child_pid, SIGTERM);
 332                         die("Not all events could be opened.\n");
 333                         return -1;
 334                 }
 335         }
 336
 337         if (perf_evlist__set_filters(evsel_list)) {
 338                 error("failed to set filter with %d (%s)\n", errno,
 339                         strerror(errno));
 340                 return -1;
 341         }
 342
 343         /*
 344          * Enable counters and exec the command:
 345          */
 346         t0 = rdclock();
 347
 348         if (forks) {
 349                 close(go_pipe[1]);
 350                 wait(&status);
 351         } else {
 352                 while(!done) sleep(1);
 353         }
 354
 355         t1 = rdclock();
 356
 357         update_stats(&walltime_nsecs_stats, t1 - t0);
 358
 359         if (no_aggr) {
 360                 list_for_each_entry(counter, &evsel_list->entries, node) {
 361                         read_counter(counter);
 362                         perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
 363                 }
 364         } else {
 365                 list_for_each_entry(counter, &evsel_list->entries, node) {
 366                         read_counter_aggr(counter);
 367                         perf_evsel__close_fd(counter, evsel_list->cpus->nr,
 368                                              evsel_list->threads->nr);
 369                 }
 370         }
 371
 372         return WEXITSTATUS(status);
 373 }
 374
 375 static void print_noise(struct perf_evsel *evsel, double avg)
 376 {
 377         struct perf_stat *ps;
 378
 379         if (run_count == 1)
 380                 return;
 381
 382         ps = evsel->priv;
 383         fprintf(stderr, "   ( +- %7.3f%% )",
 384                         100 * stddev_stats(&ps->res_stats[0]) / avg);
 385 }
 386
 387 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
 388 {
 389         double msecs = avg / 1e6;
 390         char cpustr[16] = { '\0', };
 391         const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-24s";
 392
 393         if (no_aggr)
 394                 sprintf(cpustr, "CPU%*d%s",
 395                         csv_output ? 0 : -4,
 396                         evsel_list->cpus->map[cpu], csv_sep);
 397
 398         fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
 399
 400         if (evsel->cgrp)
 401                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
 402
 403         if (csv_output)
 404                 return;
 405
 406         if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 407                 fprintf(stderr, " # %10.3f CPUs ",
 408                                 avg / avg_stats(&walltime_nsecs_stats));
 409 }
 410
 411 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
 412 {
 413         double total, ratio = 0.0;
 414         char cpustr[16] = { '\0', };
 415         const char *fmt;
 416
 417         if (csv_output)
 418                 fmt = "%s%.0f%s%s";
 419         else if (big_num)
 420                 fmt = "%s%'18.0f%s%-24s";
 421         else
 422                 fmt = "%s%18.0f%s%-24s";
 423
 424         if (no_aggr)
 425                 sprintf(cpustr, "CPU%*d%s",
 426                         csv_output ? 0 : -4,
 427                         evsel_list->cpus->map[cpu], csv_sep);
 428         else
 429                 cpu = 0;
 430
 431         fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
 432
 433         if (evsel->cgrp)
 434                 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
 435
 436         if (csv_output)
 437                 return;
 438
 439         if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
 440                 total = avg_stats(&runtime_cycles_stats[cpu]);
 441
 442                 if (total)
 443                         ratio = avg / total;
 444
 445                 fprintf(stderr, " # ( %4.2f instructions per cycle )", ratio);
 446         } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
 447                         runtime_branches_stats[cpu].n != 0) {
 448                 total = avg_stats(&runtime_branches_stats[cpu]);
 449
 450                 if (total)
 451                         ratio = avg * 100 / total;
 452
 453                 fprintf(stderr, " # %10.3f %%", ratio);
 454
 455         } else if (runtime_nsecs_stats[cpu].n != 0) {
 456                 total = avg_stats(&runtime_nsecs_stats[cpu]);
 457
 458                 if (total)
 459                         ratio = 1000.0 * avg / total;
 460
 461                 fprintf(stderr, " # %10.3f M/sec", ratio);
 462         } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES)) {
 463                 total = avg_stats(&runtime_cycles_stats[cpu]);
 464
 465                 if (total)
 466                         ratio = avg / total * 100.0;
 467
 468                 fprintf(stderr, " # (%5.2f%% of all cycles )", ratio);
 469         }
 470 }
 471
 472 /*
 473  * Print out the results of a single counter:
 474  * aggregated counts in system-wide mode
 475  */
 476 static void print_counter_aggr(struct perf_evsel *counter)
 477 {
 478         struct perf_stat *ps = counter->priv;
 479         double avg = avg_stats(&ps->res_stats[0]);
 480         int scaled = counter->counts->scaled;
 481
 482         if (scaled == -1) {
 483                 fprintf(stderr, "%*s%s%*s",
 484                         csv_output ? 0 : 18,
 485                         "<not counted>",
 486                         csv_sep,
 487                         csv_output ? 0 : -24,
 488                         event_name(counter));
 489
 490                 if (counter->cgrp)
 491                         fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
 492
 493                 fputc('\n', stderr);
 494                 return;
 495         }
 496
 497         if (nsec_counter(counter))
 498                 nsec_printout(-1, counter, avg);
 499         else
 500                 abs_printout(-1, counter, avg);
 501
 502         if (csv_output) {
 503                 fputc('\n', stderr);
 504                 return;
 505         }
 506
 507         print_noise(counter, avg);
 508
 509         if (scaled) {
 510                 double avg_enabled, avg_running;
 511
 512                 avg_enabled = avg_stats(&ps->res_stats[1]);
 513                 avg_running = avg_stats(&ps->res_stats[2]);
 514
 515                 fprintf(stderr, "  (scaled from %.2f%%)",
 516                                 100 * avg_running / avg_enabled);
 517         }
 518         fprintf(stderr, "\n");
 519 }
 520
 521 /*
 522  * Print out the results of a single counter:
 523  * does not use aggregated count in system-wide
 524  */
 525 static void print_counter(struct perf_evsel *counter)
 526 {
 527         u64 ena, run, val;
 528         int cpu;
 529
 530         for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
 531                 val = counter->counts->cpu[cpu].val;
 532                 ena = counter->counts->cpu[cpu].ena;
 533                 run = counter->counts->cpu[cpu].run;
 534                 if (run == 0 || ena == 0) {
 535                         fprintf(stderr, "CPU%*d%s%*s%s%*s",
 536                                 csv_output ? 0 : -4,
 537                                 evsel_list->cpus->map[cpu], csv_sep,
 538                                 csv_output ? 0 : 18,
 539                                 "<not counted>", csv_sep,
 540                                 csv_output ? 0 : -24,
 541                                 event_name(counter));
 542
 543                         if (counter->cgrp)
 544                                 fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
 545
 546                         fputc('\n', stderr);
 547                         continue;
 548                 }
 549
 550                 if (nsec_counter(counter))
 551                         nsec_printout(cpu, counter, val);
 552                 else
 553                         abs_printout(cpu, counter, val);
 554
 555                 if (!csv_output) {
 556                         print_noise(counter, 1.0);
 557
 558                         if (run != ena) {
 559                                 fprintf(stderr, "  (scaled from %.2f%%)",
 560                                         100.0 * run / ena);
 561                         }
 562                 }
 563                 fputc('\n', stderr);
 564         }
 565 }
 566
 567 static void print_stat(int argc, const char **argv)
 568 {
 569         struct perf_evsel *counter;
 570         int i;
 571
 572         fflush(stdout);
 573
 574         if (!csv_output) {
 575                 fprintf(stderr, "\n");
 576                 fprintf(stderr, " Performance counter stats for ");
 577                 if(target_pid == -1 && target_tid == -1) {
 578                         fprintf(stderr, "\'%s", argv[0]);
 579                         for (i = 1; i < argc; i++)
 580                                 fprintf(stderr, " %s", argv[i]);
 581                 } else if (target_pid != -1)
 582                         fprintf(stderr, "process id \'%d", target_pid);
 583                 else
 584                         fprintf(stderr, "thread id \'%d", target_tid);
 585
 586                 fprintf(stderr, "\'");
 587                 if (run_count > 1)
 588                         fprintf(stderr, " (%d runs)", run_count);
 589                 fprintf(stderr, ":\n\n");
 590         }
 591
 592         if (no_aggr) {
 593                 list_for_each_entry(counter, &evsel_list->entries, node)
 594                         print_counter(counter);
 595         } else {
 596                 list_for_each_entry(counter, &evsel_list->entries, node)
 597                         print_counter_aggr(counter);
 598         }
 599
 600         if (!csv_output) {
 601                 fprintf(stderr, "\n");
 602                 fprintf(stderr, " %18.9f  seconds time elapsed",
 603                                 avg_stats(&walltime_nsecs_stats)/1e9);
 604                 if (run_count > 1) {
 605                         fprintf(stderr, "   ( +- %7.3f%% )",
 606                                 100*stddev_stats(&walltime_nsecs_stats) /
 607                                 avg_stats(&walltime_nsecs_stats));
 608                 }
 609                 fprintf(stderr, "\n\n");
 610         }
 611 }
 612
 613 static volatile int signr = -1;
 614
 615 static void skip_signal(int signo)
 616 {
 617         if(child_pid == -1)
 618                 done = 1;
 619
 620         signr = signo;
 621 }
 622
 623 static void sig_atexit(void)
 624 {
 625         if (child_pid != -1)
 626                 kill(child_pid, SIGTERM);
 627
 628         if (signr == -1)
 629                 return;
 630
 631         signal(signr, SIG_DFL);
 632         kill(getpid(), signr);
 633 }
 634
 635 static const char * const stat_usage[] = {
 636         "perf stat [<options>] [<command>]",
 637         NULL
 638 };
 639
 640 static int stat__set_big_num(const struct option *opt __used,
 641                              const char *s __used, int unset)
 642 {
 643         big_num_opt = unset ? 0 : 1;
 644         return 0;
 645 }
 646
 647 static const struct option options[] = {
 648         OPT_CALLBACK('e', "event", &evsel_list, "event",
 649                      "event selector. use 'perf list' to list available events",
 650                      parse_events),
 651         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
 652                      "event filter", parse_filter),
 653         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
 654                     "child tasks do not inherit counters"),
 655         OPT_INTEGER('p', "pid", &target_pid,
 656                     "stat events on existing process id"),
 657         OPT_INTEGER('t', "tid", &target_tid,
 658                     "stat events on existing thread id"),
 659         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 660                     "system-wide collection from all CPUs"),
 661         OPT_BOOLEAN('c', "scale", &scale,
 662                     "scale/normalize counters"),
 663         OPT_INCR('v', "verbose", &verbose,
 664                     "be more verbose (show counter open errors, etc)"),
 665         OPT_INTEGER('r', "repeat", &run_count,
 666                     "repeat command and print average + stddev (max: 100)"),
 667         OPT_BOOLEAN('n', "null", &null_run,
 668                     "null run - dont start any counters"),
 669         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
 670                            "print large numbers with thousands\' separators",
 671                            stat__set_big_num),
 672         OPT_STRING('C', "cpu", &cpu_list, "cpu",
 673                     "list of cpus to monitor in system-wide"),
 674         OPT_BOOLEAN('A', "no-aggr", &no_aggr,
 675                     "disable CPU count aggregation"),
 676         OPT_STRING('x', "field-separator", &csv_sep, "separator",
 677                    "print counts with custom separator"),
 678         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
 679                      "monitor event in cgroup name only",
 680                      parse_cgroups),
 681         OPT_END()
 682 };
 683
 684 int cmd_stat(int argc, const char **argv, const char *prefix __used)
 685 {
 686         struct perf_evsel *pos;
 687         int status = -ENOMEM;
 688
 689         setlocale(LC_ALL, "");
 690
 691         evsel_list = perf_evlist__new(NULL, NULL);
 692         if (evsel_list == NULL)
 693                 return -ENOMEM;
 694
 695         argc = parse_options(argc, argv, options, stat_usage,
 696                 PARSE_OPT_STOP_AT_NON_OPTION);
 697
 698         if (csv_sep)
 699                 csv_output = true;
 700         else
 701                 csv_sep = DEFAULT_SEPARATOR;
 702
 703         /*
 704          * let the spreadsheet do the pretty-printing
 705          */
 706         if (csv_output) {
 707                 /* User explicitely passed -B? */
 708                 if (big_num_opt == 1) {
 709                         fprintf(stderr, "-B option not supported with -x\n");
 710                         usage_with_options(stat_usage, options);
 711                 } else /* Nope, so disable big number formatting */
 712                         big_num = false;
 713         } else if (big_num_opt == 0) /* User passed --no-big-num */
 714                 big_num = false;
 715
 716         if (!argc && target_pid == -1 && target_tid == -1)
 717                 usage_with_options(stat_usage, options);
 718         if (run_count <= 0)
 719                 usage_with_options(stat_usage, options);
 720
 721         /* no_aggr, cgroup are for system-wide only */
 722         if ((no_aggr || nr_cgroups) && !system_wide) {
 723                 fprintf(stderr, "both cgroup and no-aggregation "
 724                         "modes only available in system-wide mode\n");
 725
 726                 usage_with_options(stat_usage, options);
 727         }
 728
 729         /* Set attrs and nr_counters if no event is selected and !null_run */
 730         if (!null_run && !evsel_list->nr_entries) {
 731                 size_t c;
 732
 733                 for (c = 0; c < ARRAY_SIZE(default_attrs); ++c) {
 734                         pos = perf_evsel__new(&default_attrs[c], c);
 735                         if (pos == NULL)
 736                                 goto out;
 737                         perf_evlist__add(evsel_list, pos);
 738                 }
 739         }
 740
 741         if (target_pid != -1)
 742                 target_tid = target_pid;
 743
 744         evsel_list->threads = thread_map__new(target_pid, target_tid);
 745         if (evsel_list->threads == NULL) {
 746                 pr_err("Problems finding threads of monitor\n");
 747                 usage_with_options(stat_usage, options);
 748         }
 749
 750         if (system_wide)
 751                 evsel_list->cpus = cpu_map__new(cpu_list);
 752         else
 753                 evsel_list->cpus = cpu_map__dummy_new();
 754
 755         if (evsel_list->cpus == NULL) {
 756                 perror("failed to parse CPUs map");
 757                 usage_with_options(stat_usage, options);
 758                 return -1;
 759         }
 760
 761         list_for_each_entry(pos, &evsel_list->entries, node) {
 762                 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
 763                     perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
 764                     perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
 765                         goto out_free_fd;
 766         }
 767
 768         /*
 769          * We dont want to block the signals - that would cause
 770          * child tasks to inherit that and Ctrl-C would not work.
 771          * What we want is for Ctrl-C to work in the exec()-ed
 772          * task, but being ignored by perf stat itself:
 773          */
 774         atexit(sig_atexit);
 775         signal(SIGINT,  skip_signal);
 776         signal(SIGALRM, skip_signal);
 777         signal(SIGABRT, skip_signal);
 778
 779         status = 0;
 780         for (run_idx = 0; run_idx < run_count; run_idx++) {
 781                 if (run_count != 1 && verbose)
 782                         fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
 783                 status = run_perf_stat(argc, argv);
 784         }
 785
 786         if (status != -1)
 787                 print_stat(argc, argv);
 788 out_free_fd:
 789         list_for_each_entry(pos, &evsel_list->entries, node)
 790                 perf_evsel__free_stat_priv(pos);
 791         perf_evlist__delete_maps(evsel_list);
 792 out:
 793         perf_evlist__delete(evsel_list);
 794         return status;
 795 }