tools/perf/builtin-stat.c

   1 /*
   2  * builtin-stat.c
   3  *
   4  * Builtin stat command: Give a precise performance counters summary
   5  * overview about any workload, CPU or specific PID.
   6  *
   7  * Sample output:
   8
   9    $ perf stat ./hackbench 10
  10
  11   Time: 0.118
  12
  13   Performance counter stats for './hackbench 10':
  14
  15        1708.761321 task-clock                #   11.037 CPUs utilized
  16             41,190 context-switches          #    0.024 M/sec
  17              6,735 CPU-migrations            #    0.004 M/sec
  18             17,318 page-faults               #    0.010 M/sec
  19      5,205,202,243 cycles                    #    3.046 GHz
  20      3,856,436,920 stalled-cycles-frontend   #   74.09% frontend cycles idle
  21      1,600,790,871 stalled-cycles-backend    #   30.75% backend  cycles idle
  22      2,603,501,247 instructions              #    0.50  insns per cycle
  23                                              #    1.48  stalled cycles per insn
  24        484,357,498 branches                  #  283.455 M/sec
  25          6,388,934 branch-misses             #    1.32% of all branches
  26
  27         0.154822978  seconds time elapsed
  28
  29  *
  30  * Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  31  *
  32  * Improvements and fixes by:
  33  *
  34  *   Arjan van de Ven <arjan@linux.intel.com>
  35  *   Yanmin Zhang <yanmin.zhang@intel.com>
  36  *   Wu Fengguang <fengguang.wu@intel.com>
  37  *   Mike Galbraith <efault@gmx.de>
  38  *   Paul Mackerras <paulus@samba.org>
  39  *   Jaswinder Singh Rajput <jaswinder@kernel.org>
  40  *
  41  * Released under the GPL v2. (and only v2, not any later version)
  42  */
  43
  44 #include "perf.h"
  45 #include "builtin.h"
  46 #include "util/cgroup.h"
  47 #include "util/util.h"
  48 #include <subcmd/parse-options.h>
  49 #include "util/parse-events.h"
  50 #include "util/pmu.h"
  51 #include "util/event.h"
  52 #include "util/evlist.h"
  53 #include "util/evsel.h"
  54 #include "util/debug.h"
  55 #include "util/color.h"
  56 #include "util/stat.h"
  57 #include "util/header.h"
  58 #include "util/cpumap.h"
  59 #include "util/thread.h"
  60 #include "util/thread_map.h"
  61 #include "util/counts.h"
  62 #include "util/session.h"
  63 #include "util/tool.h"
  64 #include "asm/bug.h"
  65
  66 #include <stdlib.h>
  67 #include <sys/prctl.h>
  68 #include <locale.h>
  69
  70 #define DEFAULT_SEPARATOR       " "
  71 #define CNTR_NOT_SUPPORTED      "<not supported>"
  72 #define CNTR_NOT_COUNTED        "<not counted>"
  73
  74 static void print_counters(struct timespec *ts, int argc, const char **argv);
  75
  76 /* Default events used for perf stat -T */
  77 static const char *transaction_attrs = {
  78         "task-clock,"
  79         "{"
  80         "instructions,"
  81         "cycles,"
  82         "cpu/cycles-t/,"
  83         "cpu/tx-start/,"
  84         "cpu/el-start/,"
  85         "cpu/cycles-ct/"
  86         "}"
  87 };
  88
  89 /* More limited version when the CPU does not have all events. */
  90 static const char * transaction_limited_attrs = {
  91         "task-clock,"
  92         "{"
  93         "instructions,"
  94         "cycles,"
  95         "cpu/cycles-t/,"
  96         "cpu/tx-start/"
  97         "}"
  98 };
  99
 100 static struct perf_evlist       *evsel_list;
 101
 102 static struct target target = {
 103         .uid    = UINT_MAX,
 104 };
 105
 106 typedef int (*aggr_get_id_t)(struct cpu_map *m, int cpu);
 107
 108 static int                      run_count                       =  1;
 109 static bool                     no_inherit                      = false;
 110 static volatile pid_t           child_pid                       = -1;
 111 static bool                     null_run                        =  false;
 112 static int                      detailed_run                    =  0;
 113 static bool                     transaction_run;
 114 static bool                     big_num                         =  true;
 115 static int                      big_num_opt                     =  -1;
 116 static const char               *csv_sep                        = NULL;
 117 static bool                     csv_output                      = false;
 118 static bool                     group                           = false;
 119 static const char               *pre_cmd                        = NULL;
 120 static const char               *post_cmd                       = NULL;
 121 static bool                     sync_run                        = false;
 122 static unsigned int             initial_delay                   = 0;
 123 static unsigned int             unit_width                      = 4; /* strlen("unit") */
 124 static bool                     forever                         = false;
 125 static struct timespec          ref_time;
 126 static struct cpu_map           *aggr_map;
 127 static aggr_get_id_t            aggr_get_id;
 128 static bool                     append_file;
 129 static const char               *output_name;
 130 static int                      output_fd;
 131
 132 struct perf_stat {
 133         bool                     record;
 134         struct perf_data_file    file;
 135         struct perf_session     *session;
 136         u64                      bytes_written;
 137         struct perf_tool         tool;
 138         bool                     maps_allocated;
 139         struct cpu_map          *cpus;
 140         struct thread_map       *threads;
 141         enum aggr_mode           aggr_mode;
 142 };
 143
 144 static struct perf_stat         perf_stat;
 145 #define STAT_RECORD             perf_stat.record
 146
 147 static volatile int done = 0;
 148
 149 static struct perf_stat_config stat_config = {
 150         .aggr_mode      = AGGR_GLOBAL,
 151         .scale          = true,
 152 };
 153
 154 static inline void diff_timespec(struct timespec *r, struct timespec *a,
 155                                  struct timespec *b)
 156 {
 157         r->tv_sec = a->tv_sec - b->tv_sec;
 158         if (a->tv_nsec < b->tv_nsec) {
 159                 r->tv_nsec = a->tv_nsec + 1000000000L - b->tv_nsec;
 160                 r->tv_sec--;
 161         } else {
 162                 r->tv_nsec = a->tv_nsec - b->tv_nsec ;
 163         }
 164 }
 165
 166 static void perf_stat__reset_stats(void)
 167 {
 168         perf_evlist__reset_stats(evsel_list);
 169         perf_stat__reset_shadow_stats();
 170 }
 171
 172 static int create_perf_stat_counter(struct perf_evsel *evsel)
 173 {
 174         struct perf_event_attr *attr = &evsel->attr;
 175
 176         if (stat_config.scale)
 177                 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
 178                                     PERF_FORMAT_TOTAL_TIME_RUNNING;
 179
 180         attr->inherit = !no_inherit;
 181
 182         /*
 183          * Some events get initialized with sample_(period/type) set,
 184          * like tracepoints. Clear it up for counting.
 185          */
 186         attr->sample_period = 0;
 187
 188         /*
 189          * But set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
 190          * while avoiding that older tools show confusing messages.
 191          *
 192          * However for pipe sessions we need to keep it zero,
 193          * because script's perf_evsel__check_attr is triggered
 194          * by attr->sample_type != 0, and we can't run it on
 195          * stat sessions.
 196          */
 197         if (!(STAT_RECORD && perf_stat.file.is_pipe))
 198                 attr->sample_type = PERF_SAMPLE_IDENTIFIER;
 199
 200         /*
 201          * Disabling all counters initially, they will be enabled
 202          * either manually by us or by kernel via enable_on_exec
 203          * set later.
 204          */
 205         if (perf_evsel__is_group_leader(evsel)) {
 206                 attr->disabled = 1;
 207
 208                 /*
 209                  * In case of initial_delay we enable tracee
 210                  * events manually.
 211                  */
 212                 if (target__none(&target) && !initial_delay)
 213                         attr->enable_on_exec = 1;
 214         }
 215
 216         if (target__has_cpu(&target))
 217                 return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));
 218
 219         return perf_evsel__open_per_thread(evsel, evsel_list->threads);
 220 }
 221
 222 /*
 223  * Does the counter have nsecs as a unit?
 224  */
 225 static inline int nsec_counter(struct perf_evsel *evsel)
 226 {
 227         if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
 228             perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
 229                 return 1;
 230
 231         return 0;
 232 }
 233
 234 static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
 235                                      union perf_event *event,
 236                                      struct perf_sample *sample __maybe_unused,
 237                                      struct machine *machine __maybe_unused)
 238 {
 239         if (perf_data_file__write(&perf_stat.file, event, event->header.size) < 0) {
 240                 pr_err("failed to write perf data, error: %m\n");
 241                 return -1;
 242         }
 243
 244         perf_stat.bytes_written += event->header.size;
 245         return 0;
 246 }
 247
 248 static int write_stat_round_event(u64 tm, u64 type)
 249 {
 250         return perf_event__synthesize_stat_round(NULL, tm, type,
 251                                                  process_synthesized_event,
 252                                                  NULL);
 253 }
 254
 255 #define WRITE_STAT_ROUND_EVENT(time, interval) \
 256         write_stat_round_event(time, PERF_STAT_ROUND_TYPE__ ## interval)
 257
 258 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
 259
 260 static int
 261 perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
 262                              struct perf_counts_values *count)
 263 {
 264         struct perf_sample_id *sid = SID(counter, cpu, thread);
 265
 266         return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
 267                                            process_synthesized_event, NULL);
 268 }
 269
 270 /*
 271  * Read out the results of a single counter:
 272  * do not aggregate counts across CPUs in system-wide mode
 273  */
 274 static int read_counter(struct perf_evsel *counter)
 275 {
 276         int nthreads = thread_map__nr(evsel_list->threads);
 277         int ncpus = perf_evsel__nr_cpus(counter);
 278         int cpu, thread;
 279
 280         if (!counter->supported)
 281                 return -ENOENT;
 282
 283         if (counter->system_wide)
 284                 nthreads = 1;
 285
 286         for (thread = 0; thread < nthreads; thread++) {
 287                 for (cpu = 0; cpu < ncpus; cpu++) {
 288                         struct perf_counts_values *count;
 289
 290                         count = perf_counts(counter->counts, cpu, thread);
 291                         if (perf_evsel__read(counter, cpu, thread, count))
 292                                 return -1;
 293
 294                         if (STAT_RECORD) {
 295                                 if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
 296                                         pr_err("failed to write stat event\n");
 297                                         return -1;
 298                                 }
 299                         }
 300                 }
 301         }
 302
 303         return 0;
 304 }
 305
 306 static void read_counters(bool close_counters)
 307 {
 308         struct perf_evsel *counter;
 309
 310         evlist__for_each(evsel_list, counter) {
 311                 if (read_counter(counter))
 312                         pr_debug("failed to read counter %s\n", counter->name);
 313
 314                 if (perf_stat_process_counter(&stat_config, counter))
 315                         pr_warning("failed to process counter %s\n", counter->name);
 316
 317                 if (close_counters) {
 318                         perf_evsel__close_fd(counter, perf_evsel__nr_cpus(counter),
 319                                              thread_map__nr(evsel_list->threads));
 320                 }
 321         }
 322 }
 323
 324 static void process_interval(void)
 325 {
 326         struct timespec ts, rs;
 327
 328         read_counters(false);
 329
 330         clock_gettime(CLOCK_MONOTONIC, &ts);
 331         diff_timespec(&rs, &ts, &ref_time);
 332
 333         if (STAT_RECORD) {
 334                 if (WRITE_STAT_ROUND_EVENT(rs.tv_sec * NSECS_PER_SEC + rs.tv_nsec, INTERVAL))
 335                         pr_err("failed to write stat round event\n");
 336         }
 337
 338         print_counters(&rs, 0, NULL);
 339 }
 340
 341 static void enable_counters(void)
 342 {
 343         if (initial_delay)
 344                 usleep(initial_delay * 1000);
 345
 346         /*
 347          * We need to enable counters only if:
 348          * - we don't have tracee (attaching to task or cpu)
 349          * - we have initial delay configured
 350          */
 351         if (!target__none(&target) || initial_delay)
 352                 perf_evlist__enable(evsel_list);
 353 }
 354
 355 static volatile int workload_exec_errno;
 356
 357 /*
 358  * perf_evlist__prepare_workload will send a SIGUSR1
 359  * if the fork fails, since we asked by setting its
 360  * want_signal to true.
 361  */
 362 static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
 363                                         void *ucontext __maybe_unused)
 364 {
 365         workload_exec_errno = info->si_value.sival_int;
 366 }
 367
 368 static bool has_unit(struct perf_evsel *counter)
 369 {
 370         return counter->unit && *counter->unit;
 371 }
 372
 373 static bool has_scale(struct perf_evsel *counter)
 374 {
 375         return counter->scale != 1;
 376 }
 377
 378 static int perf_stat_synthesize_config(bool is_pipe)
 379 {
 380         struct perf_evsel *counter;
 381         int err;
 382
 383         if (is_pipe) {
 384                 err = perf_event__synthesize_attrs(NULL, perf_stat.session,
 385                                                    process_synthesized_event);
 386                 if (err < 0) {
 387                         pr_err("Couldn't synthesize attrs.\n");
 388                         return err;
 389                 }
 390         }
 391
 392         /*
 393          * Synthesize other events stuff not carried within
 394          * attr event - unit, scale, name
 395          */
 396         evlist__for_each(evsel_list, counter) {
 397                 if (!counter->supported)
 398                         continue;
 399
 400                 /*
 401                  * Synthesize unit and scale only if it's defined.
 402                  */
 403                 if (has_unit(counter)) {
 404                         err = perf_event__synthesize_event_update_unit(NULL, counter, process_synthesized_event);
 405                         if (err < 0) {
 406                                 pr_err("Couldn't synthesize evsel unit.\n");
 407                                 return err;
 408                         }
 409                 }
 410
 411                 if (has_scale(counter)) {
 412                         err = perf_event__synthesize_event_update_scale(NULL, counter, process_synthesized_event);
 413                         if (err < 0) {
 414                                 pr_err("Couldn't synthesize evsel scale.\n");
 415                                 return err;
 416                         }
 417                 }
 418
 419                 if (counter->own_cpus) {
 420                         err = perf_event__synthesize_event_update_cpus(NULL, counter, process_synthesized_event);
 421                         if (err < 0) {
 422                                 pr_err("Couldn't synthesize evsel scale.\n");
 423                                 return err;
 424                         }
 425                 }
 426
 427                 /*
 428                  * Name is needed only for pipe output,
 429                  * perf.data carries event names.
 430                  */
 431                 if (is_pipe) {
 432                         err = perf_event__synthesize_event_update_name(NULL, counter, process_synthesized_event);
 433                         if (err < 0) {
 434                                 pr_err("Couldn't synthesize evsel name.\n");
 435                                 return err;
 436                         }
 437                 }
 438         }
 439
 440         err = perf_event__synthesize_thread_map2(NULL, evsel_list->threads,
 441                                                 process_synthesized_event,
 442                                                 NULL);
 443         if (err < 0) {
 444                 pr_err("Couldn't synthesize thread map.\n");
 445                 return err;
 446         }
 447
 448         err = perf_event__synthesize_cpu_map(NULL, evsel_list->cpus,
 449                                              process_synthesized_event, NULL);
 450         if (err < 0) {
 451                 pr_err("Couldn't synthesize thread map.\n");
 452                 return err;
 453         }
 454
 455         err = perf_event__synthesize_stat_config(NULL, &stat_config,
 456                                                  process_synthesized_event, NULL);
 457         if (err < 0) {
 458                 pr_err("Couldn't synthesize config.\n");
 459                 return err;
 460         }
 461
 462         return 0;
 463 }
 464
 465 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
 466
 467 static int __store_counter_ids(struct perf_evsel *counter,
 468                                struct cpu_map *cpus,
 469                                struct thread_map *threads)
 470 {
 471         int cpu, thread;
 472
 473         for (cpu = 0; cpu < cpus->nr; cpu++) {
 474                 for (thread = 0; thread < threads->nr; thread++) {
 475                         int fd = FD(counter, cpu, thread);
 476
 477                         if (perf_evlist__id_add_fd(evsel_list, counter,
 478                                                    cpu, thread, fd) < 0)
 479                                 return -1;
 480                 }
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int store_counter_ids(struct perf_evsel *counter)
 487 {
 488         struct cpu_map *cpus = counter->cpus;
 489         struct thread_map *threads = counter->threads;
 490
 491         if (perf_evsel__alloc_id(counter, cpus->nr, threads->nr))
 492                 return -ENOMEM;
 493
 494         return __store_counter_ids(counter, cpus, threads);
 495 }
 496
 497 static int __run_perf_stat(int argc, const char **argv)
 498 {
 499         int interval = stat_config.interval;
 500         char msg[512];
 501         unsigned long long t0, t1;
 502         struct perf_evsel *counter;
 503         struct timespec ts;
 504         size_t l;
 505         int status = 0;
 506         const bool forks = (argc > 0);
 507         bool is_pipe = STAT_RECORD ? perf_stat.file.is_pipe : false;
 508
 509         if (interval) {
 510                 ts.tv_sec  = interval / 1000;
 511                 ts.tv_nsec = (interval % 1000) * 1000000;
 512         } else {
 513                 ts.tv_sec  = 1;
 514                 ts.tv_nsec = 0;
 515         }
 516
 517         if (forks) {
 518                 if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
 519                                                   workload_exec_failed_signal) < 0) {
 520                         perror("failed to prepare workload");
 521                         return -1;
 522                 }
 523                 child_pid = evsel_list->workload.pid;
 524         }
 525
 526         if (group)
 527                 perf_evlist__set_leader(evsel_list);
 528
 529         evlist__for_each(evsel_list, counter) {
 530                 if (create_perf_stat_counter(counter) < 0) {
 531                         /*
 532                          * PPC returns ENXIO for HW counters until 2.6.37
 533                          * (behavior changed with commit b0a873e).
 534                          */
 535                         if (errno == EINVAL || errno == ENOSYS ||
 536                             errno == ENOENT || errno == EOPNOTSUPP ||
 537                             errno == ENXIO) {
 538                                 if (verbose)
 539                                         ui__warning("%s event is not supported by the kernel.\n",
 540                                                     perf_evsel__name(counter));
 541                                 counter->supported = false;
 542
 543                                 if ((counter->leader != counter) ||
 544                                     !(counter->leader->nr_members > 1))
 545                                         continue;
 546                         }
 547
 548                         perf_evsel__open_strerror(counter, &target,
 549                                                   errno, msg, sizeof(msg));
 550                         ui__error("%s\n", msg);
 551
 552                         if (child_pid != -1)
 553                                 kill(child_pid, SIGTERM);
 554
 555                         return -1;
 556                 }
 557                 counter->supported = true;
 558
 559                 l = strlen(counter->unit);
 560                 if (l > unit_width)
 561                         unit_width = l;
 562
 563                 if (STAT_RECORD && store_counter_ids(counter))
 564                         return -1;
 565         }
 566
 567         if (perf_evlist__apply_filters(evsel_list, &counter)) {
 568                 error("failed to set filter \"%s\" on event %s with %d (%s)\n",
 569                         counter->filter, perf_evsel__name(counter), errno,
 570                         strerror_r(errno, msg, sizeof(msg)));
 571                 return -1;
 572         }
 573
 574         if (STAT_RECORD) {
 575                 int err, fd = perf_data_file__fd(&perf_stat.file);
 576
 577                 if (is_pipe) {
 578                         err = perf_header__write_pipe(perf_data_file__fd(&perf_stat.file));
 579                 } else {
 580                         err = perf_session__write_header(perf_stat.session, evsel_list,
 581                                                          fd, false);
 582                 }
 583
 584                 if (err < 0)
 585                         return err;
 586
 587                 err = perf_stat_synthesize_config(is_pipe);
 588                 if (err < 0)
 589                         return err;
 590         }
 591
 592         /*
 593          * Enable counters and exec the command:
 594          */
 595         t0 = rdclock();
 596         clock_gettime(CLOCK_MONOTONIC, &ref_time);
 597
 598         if (forks) {
 599                 perf_evlist__start_workload(evsel_list);
 600                 enable_counters();
 601
 602                 if (interval) {
 603                         while (!waitpid(child_pid, &status, WNOHANG)) {
 604                                 nanosleep(&ts, NULL);
 605                                 process_interval();
 606                         }
 607                 }
 608                 wait(&status);
 609
 610                 if (workload_exec_errno) {
 611                         const char *emsg = strerror_r(workload_exec_errno, msg, sizeof(msg));
 612                         pr_err("Workload failed: %s\n", emsg);
 613                         return -1;
 614                 }
 615
 616                 if (WIFSIGNALED(status))
 617                         psignal(WTERMSIG(status), argv[0]);
 618         } else {
 619                 enable_counters();
 620                 while (!done) {
 621                         nanosleep(&ts, NULL);
 622                         if (interval)
 623                                 process_interval();
 624                 }
 625         }
 626
 627         t1 = rdclock();
 628
 629         update_stats(&walltime_nsecs_stats, t1 - t0);
 630
 631         read_counters(true);
 632
 633         return WEXITSTATUS(status);
 634 }
 635
 636 static int run_perf_stat(int argc, const char **argv)
 637 {
 638         int ret;
 639
 640         if (pre_cmd) {
 641                 ret = system(pre_cmd);
 642                 if (ret)
 643                         return ret;
 644         }
 645
 646         if (sync_run)
 647                 sync();
 648
 649         ret = __run_perf_stat(argc, argv);
 650         if (ret)
 651                 return ret;
 652
 653         if (post_cmd) {
 654                 ret = system(post_cmd);
 655                 if (ret)
 656                         return ret;
 657         }
 658
 659         return ret;
 660 }
 661
 662 static void print_running(u64 run, u64 ena)
 663 {
 664         if (csv_output) {
 665                 fprintf(stat_config.output, "%s%" PRIu64 "%s%.2f",
 666                                         csv_sep,
 667                                         run,
 668                                         csv_sep,
 669                                         ena ? 100.0 * run / ena : 100.0);
 670         } else if (run != ena) {
 671                 fprintf(stat_config.output, "  (%.2f%%)", 100.0 * run / ena);
 672         }
 673 }
 674
 675 static void print_noise_pct(double total, double avg)
 676 {
 677         double pct = rel_stddev_stats(total, avg);
 678
 679         if (csv_output)
 680                 fprintf(stat_config.output, "%s%.2f%%", csv_sep, pct);
 681         else if (pct)
 682                 fprintf(stat_config.output, "  ( +-%6.2f%% )", pct);
 683 }
 684
 685 static void print_noise(struct perf_evsel *evsel, double avg)
 686 {
 687         struct perf_stat_evsel *ps;
 688
 689         if (run_count == 1)
 690                 return;
 691
 692         ps = evsel->priv;
 693         print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
 694 }
 695
 696 static void aggr_printout(struct perf_evsel *evsel, int id, int nr)
 697 {
 698         switch (stat_config.aggr_mode) {
 699         case AGGR_CORE:
 700                 fprintf(stat_config.output, "S%d-C%*d%s%*d%s",
 701                         cpu_map__id_to_socket(id),
 702                         csv_output ? 0 : -8,
 703                         cpu_map__id_to_cpu(id),
 704                         csv_sep,
 705                         csv_output ? 0 : 4,
 706                         nr,
 707                         csv_sep);
 708                 break;
 709         case AGGR_SOCKET:
 710                 fprintf(stat_config.output, "S%*d%s%*d%s",
 711                         csv_output ? 0 : -5,
 712                         id,
 713                         csv_sep,
 714                         csv_output ? 0 : 4,
 715                         nr,
 716                         csv_sep);
 717                         break;
 718         case AGGR_NONE:
 719                 fprintf(stat_config.output, "CPU%*d%s",
 720                         csv_output ? 0 : -4,
 721                         perf_evsel__cpus(evsel)->map[id], csv_sep);
 722                 break;
 723         case AGGR_THREAD:
 724                 fprintf(stat_config.output, "%*s-%*d%s",
 725                         csv_output ? 0 : 16,
 726                         thread_map__comm(evsel->threads, id),
 727                         csv_output ? 0 : -8,
 728                         thread_map__pid(evsel->threads, id),
 729                         csv_sep);
 730                 break;
 731         case AGGR_GLOBAL:
 732         case AGGR_UNSET:
 733         default:
 734                 break;
 735         }
 736 }
 737
 738 static void nsec_printout(int id, int nr, struct perf_evsel *evsel, double avg)
 739 {
 740         FILE *output = stat_config.output;
 741         double msecs = avg / 1e6;
 742         const char *fmt_v, *fmt_n;
 743         char name[25];
 744
 745         fmt_v = csv_output ? "%.6f%s" : "%18.6f%s";
 746         fmt_n = csv_output ? "%s" : "%-25s";
 747
 748         aggr_printout(evsel, id, nr);
 749
 750         scnprintf(name, sizeof(name), "%s%s",
 751                   perf_evsel__name(evsel), csv_output ? "" : " (msec)");
 752
 753         fprintf(output, fmt_v, msecs, csv_sep);
 754
 755         if (csv_output)
 756                 fprintf(output, "%s%s", evsel->unit, csv_sep);
 757         else
 758                 fprintf(output, "%-*s%s", unit_width, evsel->unit, csv_sep);
 759
 760         fprintf(output, fmt_n, name);
 761
 762         if (evsel->cgrp)
 763                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
 764 }
 765
 766 static void abs_printout(int id, int nr, struct perf_evsel *evsel, double avg)
 767 {
 768         FILE *output = stat_config.output;
 769         double sc =  evsel->scale;
 770         const char *fmt;
 771
 772         if (csv_output) {
 773                 fmt = sc != 1.0 ?  "%.2f%s" : "%.0f%s";
 774         } else {
 775                 if (big_num)
 776                         fmt = sc != 1.0 ? "%'18.2f%s" : "%'18.0f%s";
 777                 else
 778                         fmt = sc != 1.0 ? "%18.2f%s" : "%18.0f%s";
 779         }
 780
 781         aggr_printout(evsel, id, nr);
 782
 783         fprintf(output, fmt, avg, csv_sep);
 784
 785         if (evsel->unit)
 786                 fprintf(output, "%-*s%s",
 787                         csv_output ? 0 : unit_width,
 788                         evsel->unit, csv_sep);
 789
 790         fprintf(output, "%-*s", csv_output ? 0 : 25, perf_evsel__name(evsel));
 791
 792         if (evsel->cgrp)
 793                 fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
 794 }
 795
 796 static void printout(int id, int nr, struct perf_evsel *counter, double uval)
 797 {
 798         int cpu = cpu_map__id_to_cpu(id);
 799
 800         if (stat_config.aggr_mode == AGGR_GLOBAL)
 801                 cpu = 0;
 802
 803         if (nsec_counter(counter))
 804                 nsec_printout(id, nr, counter, uval);
 805         else
 806                 abs_printout(id, nr, counter, uval);
 807
 808         if (!csv_output && !stat_config.interval)
 809                 perf_stat__print_shadow_stats(stat_config.output, counter,
 810                                               uval, cpu,
 811                                               stat_config.aggr_mode);
 812 }
 813
 814 static void print_aggr(char *prefix)
 815 {
 816         FILE *output = stat_config.output;
 817         struct perf_evsel *counter;
 818         int cpu, s, s2, id, nr;
 819         double uval;
 820         u64 ena, run, val;
 821
 822         if (!(aggr_map || aggr_get_id))
 823                 return;
 824
 825         for (s = 0; s < aggr_map->nr; s++) {
 826                 id = aggr_map->map[s];
 827                 evlist__for_each(evsel_list, counter) {
 828                         val = ena = run = 0;
 829                         nr = 0;
 830                         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
 831                                 s2 = aggr_get_id(perf_evsel__cpus(counter), cpu);
 832                                 if (s2 != id)
 833                                         continue;
 834                                 val += perf_counts(counter->counts, cpu, 0)->val;
 835                                 ena += perf_counts(counter->counts, cpu, 0)->ena;
 836                                 run += perf_counts(counter->counts, cpu, 0)->run;
 837                                 nr++;
 838                         }
 839                         if (prefix)
 840                                 fprintf(output, "%s", prefix);
 841
 842                         if (run == 0 || ena == 0) {
 843                                 aggr_printout(counter, id, nr);
 844
 845                                 fprintf(output, "%*s%s",
 846                                         csv_output ? 0 : 18,
 847                                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 848                                         csv_sep);
 849
 850                                 fprintf(output, "%-*s%s",
 851                                         csv_output ? 0 : unit_width,
 852                                         counter->unit, csv_sep);
 853
 854                                 fprintf(output, "%*s",
 855                                         csv_output ? 0 : -25,
 856                                         perf_evsel__name(counter));
 857
 858                                 if (counter->cgrp)
 859                                         fprintf(output, "%s%s",
 860                                                 csv_sep, counter->cgrp->name);
 861
 862                                 print_running(run, ena);
 863                                 fputc('\n', output);
 864                                 continue;
 865                         }
 866                         uval = val * counter->scale;
 867                         printout(id, nr, counter, uval);
 868                         if (!csv_output)
 869                                 print_noise(counter, 1.0);
 870
 871                         print_running(run, ena);
 872                         fputc('\n', output);
 873                 }
 874         }
 875 }
 876
 877 static void print_aggr_thread(struct perf_evsel *counter, char *prefix)
 878 {
 879         FILE *output = stat_config.output;
 880         int nthreads = thread_map__nr(counter->threads);
 881         int ncpus = cpu_map__nr(counter->cpus);
 882         int cpu, thread;
 883         double uval;
 884
 885         for (thread = 0; thread < nthreads; thread++) {
 886                 u64 ena = 0, run = 0, val = 0;
 887
 888                 for (cpu = 0; cpu < ncpus; cpu++) {
 889                         val += perf_counts(counter->counts, cpu, thread)->val;
 890                         ena += perf_counts(counter->counts, cpu, thread)->ena;
 891                         run += perf_counts(counter->counts, cpu, thread)->run;
 892                 }
 893
 894                 if (prefix)
 895                         fprintf(output, "%s", prefix);
 896
 897                 uval = val * counter->scale;
 898                 printout(thread, 0, counter, uval);
 899
 900                 if (!csv_output)
 901                         print_noise(counter, 1.0);
 902
 903                 print_running(run, ena);
 904                 fputc('\n', output);
 905         }
 906 }
 907
 908 /*
 909  * Print out the results of a single counter:
 910  * aggregated counts in system-wide mode
 911  */
 912 static void print_counter_aggr(struct perf_evsel *counter, char *prefix)
 913 {
 914         FILE *output = stat_config.output;
 915         struct perf_stat_evsel *ps = counter->priv;
 916         double avg = avg_stats(&ps->res_stats[0]);
 917         int scaled = counter->counts->scaled;
 918         double uval;
 919         double avg_enabled, avg_running;
 920
 921         avg_enabled = avg_stats(&ps->res_stats[1]);
 922         avg_running = avg_stats(&ps->res_stats[2]);
 923
 924         if (prefix)
 925                 fprintf(output, "%s", prefix);
 926
 927         if (scaled == -1 || !counter->supported) {
 928                 fprintf(output, "%*s%s",
 929                         csv_output ? 0 : 18,
 930                         counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 931                         csv_sep);
 932                 fprintf(output, "%-*s%s",
 933                         csv_output ? 0 : unit_width,
 934                         counter->unit, csv_sep);
 935                 fprintf(output, "%*s",
 936                         csv_output ? 0 : -25,
 937                         perf_evsel__name(counter));
 938
 939                 if (counter->cgrp)
 940                         fprintf(output, "%s%s", csv_sep, counter->cgrp->name);
 941
 942                 print_running(avg_running, avg_enabled);
 943                 fputc('\n', output);
 944                 return;
 945         }
 946
 947         uval = avg * counter->scale;
 948         printout(-1, 0, counter, uval);
 949
 950         print_noise(counter, avg);
 951
 952         print_running(avg_running, avg_enabled);
 953         fprintf(output, "\n");
 954 }
 955
 956 /*
 957  * Print out the results of a single counter:
 958  * does not use aggregated count in system-wide
 959  */
 960 static void print_counter(struct perf_evsel *counter, char *prefix)
 961 {
 962         FILE *output = stat_config.output;
 963         u64 ena, run, val;
 964         double uval;
 965         int cpu;
 966
 967         for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
 968                 val = perf_counts(counter->counts, cpu, 0)->val;
 969                 ena = perf_counts(counter->counts, cpu, 0)->ena;
 970                 run = perf_counts(counter->counts, cpu, 0)->run;
 971
 972                 if (prefix)
 973                         fprintf(output, "%s", prefix);
 974
 975                 if (run == 0 || ena == 0) {
 976                         fprintf(output, "CPU%*d%s%*s%s",
 977                                 csv_output ? 0 : -4,
 978                                 perf_evsel__cpus(counter)->map[cpu], csv_sep,
 979                                 csv_output ? 0 : 18,
 980                                 counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
 981                                 csv_sep);
 982
 983                                 fprintf(output, "%-*s%s",
 984                                         csv_output ? 0 : unit_width,
 985                                         counter->unit, csv_sep);
 986
 987                                 fprintf(output, "%*s",
 988                                         csv_output ? 0 : -25,
 989                                         perf_evsel__name(counter));
 990
 991                         if (counter->cgrp)
 992                                 fprintf(output, "%s%s",
 993                                         csv_sep, counter->cgrp->name);
 994
 995                         print_running(run, ena);
 996                         fputc('\n', output);
 997                         continue;
 998                 }
 999
1000                 uval = val * counter->scale;
1001                 printout(cpu, 0, counter, uval);
1002                 if (!csv_output)
1003                         print_noise(counter, 1.0);
1004                 print_running(run, ena);
1005
1006                 fputc('\n', output);
1007         }
1008 }
1009
1010 static void print_interval(char *prefix, struct timespec *ts)
1011 {
1012         FILE *output = stat_config.output;
1013         static int num_print_interval;
1014
1015         sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
1016
1017         if (num_print_interval == 0 && !csv_output) {
1018                 switch (stat_config.aggr_mode) {
1019                 case AGGR_SOCKET:
1020                         fprintf(output, "#           time socket cpus             counts %*s events\n", unit_width, "unit");
1021                         break;
1022                 case AGGR_CORE:
1023                         fprintf(output, "#           time core         cpus             counts %*s events\n", unit_width, "unit");
1024                         break;
1025                 case AGGR_NONE:
1026                         fprintf(output, "#           time CPU                counts %*s events\n", unit_width, "unit");
1027                         break;
1028                 case AGGR_THREAD:
1029                         fprintf(output, "#           time             comm-pid                  counts %*s events\n", unit_width, "unit");
1030                         break;
1031                 case AGGR_GLOBAL:
1032                 default:
1033                         fprintf(output, "#           time             counts %*s events\n", unit_width, "unit");
1034                 case AGGR_UNSET:
1035                         break;
1036                 }
1037         }
1038
1039         if (++num_print_interval == 25)
1040                 num_print_interval = 0;
1041 }
1042
1043 static void print_header(int argc, const char **argv)
1044 {
1045         FILE *output = stat_config.output;
1046         int i;
1047
1048         fflush(stdout);
1049
1050         if (!csv_output) {
1051                 fprintf(output, "\n");
1052                 fprintf(output, " Performance counter stats for ");
1053                 if (target.system_wide)
1054                         fprintf(output, "\'system wide");
1055                 else if (target.cpu_list)
1056                         fprintf(output, "\'CPU(s) %s", target.cpu_list);
1057                 else if (!target__has_task(&target)) {
1058                         fprintf(output, "\'%s", argv ? argv[0] : "pipe");
1059                         for (i = 1; argv && (i < argc); i++)
1060                                 fprintf(output, " %s", argv[i]);
1061                 } else if (target.pid)
1062                         fprintf(output, "process id \'%s", target.pid);
1063                 else
1064                         fprintf(output, "thread id \'%s", target.tid);
1065
1066                 fprintf(output, "\'");
1067                 if (run_count > 1)
1068                         fprintf(output, " (%d runs)", run_count);
1069                 fprintf(output, ":\n\n");
1070         }
1071 }
1072
1073 static void print_footer(void)
1074 {
1075         FILE *output = stat_config.output;
1076
1077         if (!null_run)
1078                 fprintf(output, "\n");
1079         fprintf(output, " %17.9f seconds time elapsed",
1080                         avg_stats(&walltime_nsecs_stats)/1e9);
1081         if (run_count > 1) {
1082                 fprintf(output, "                                        ");
1083                 print_noise_pct(stddev_stats(&walltime_nsecs_stats),
1084                                 avg_stats(&walltime_nsecs_stats));
1085         }
1086         fprintf(output, "\n\n");
1087 }
1088
1089 static void print_counters(struct timespec *ts, int argc, const char **argv)
1090 {
1091         int interval = stat_config.interval;
1092         struct perf_evsel *counter;
1093         char buf[64], *prefix = NULL;
1094
1095         /* Do not print anything if we record to the pipe. */
1096         if (STAT_RECORD && perf_stat.file.is_pipe)
1097                 return;
1098
1099         if (interval)
1100                 print_interval(prefix = buf, ts);
1101         else
1102                 print_header(argc, argv);
1103
1104         switch (stat_config.aggr_mode) {
1105         case AGGR_CORE:
1106         case AGGR_SOCKET:
1107                 print_aggr(prefix);
1108                 break;
1109         case AGGR_THREAD:
1110                 evlist__for_each(evsel_list, counter)
1111                         print_aggr_thread(counter, prefix);
1112                 break;
1113         case AGGR_GLOBAL:
1114                 evlist__for_each(evsel_list, counter)
1115                         print_counter_aggr(counter, prefix);
1116                 break;
1117         case AGGR_NONE:
1118                 evlist__for_each(evsel_list, counter)
1119                         print_counter(counter, prefix);
1120                 break;
1121         case AGGR_UNSET:
1122         default:
1123                 break;
1124         }
1125
1126         if (!interval && !csv_output)
1127                 print_footer();
1128
1129         fflush(stat_config.output);
1130 }
1131
1132 static volatile int signr = -1;
1133
1134 static void skip_signal(int signo)
1135 {
1136         if ((child_pid == -1) || stat_config.interval)
1137                 done = 1;
1138
1139         signr = signo;
1140         /*
1141          * render child_pid harmless
1142          * won't send SIGTERM to a random
1143          * process in case of race condition
1144          * and fast PID recycling
1145          */
1146         child_pid = -1;
1147 }
1148
1149 static void sig_atexit(void)
1150 {
1151         sigset_t set, oset;
1152
1153         /*
1154          * avoid race condition with SIGCHLD handler
1155          * in skip_signal() which is modifying child_pid
1156          * goal is to avoid send SIGTERM to a random
1157          * process
1158          */
1159         sigemptyset(&set);
1160         sigaddset(&set, SIGCHLD);
1161         sigprocmask(SIG_BLOCK, &set, &oset);
1162
1163         if (child_pid != -1)
1164                 kill(child_pid, SIGTERM);
1165
1166         sigprocmask(SIG_SETMASK, &oset, NULL);
1167
1168         if (signr == -1)
1169                 return;
1170
1171         signal(signr, SIG_DFL);
1172         kill(getpid(), signr);
1173 }
1174
1175 static int stat__set_big_num(const struct option *opt __maybe_unused,
1176                              const char *s __maybe_unused, int unset)
1177 {
1178         big_num_opt = unset ? 0 : 1;
1179         return 0;
1180 }
1181
1182 static const struct option stat_options[] = {
1183         OPT_BOOLEAN('T', "transaction", &transaction_run,
1184                     "hardware transaction statistics"),
1185         OPT_CALLBACK('e', "event", &evsel_list, "event",
1186                      "event selector. use 'perf list' to list available events",
1187                      parse_events_option),
1188         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
1189                      "event filter", parse_filter),
1190         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
1191                     "child tasks do not inherit counters"),
1192         OPT_STRING('p', "pid", &target.pid, "pid",
1193                    "stat events on existing process id"),
1194         OPT_STRING('t', "tid", &target.tid, "tid",
1195                    "stat events on existing thread id"),
1196         OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
1197                     "system-wide collection from all CPUs"),
1198         OPT_BOOLEAN('g', "group", &group,
1199                     "put the counters into a counter group"),
1200         OPT_BOOLEAN('c', "scale", &stat_config.scale, "scale/normalize counters"),
1201         OPT_INCR('v', "verbose", &verbose,
1202                     "be more verbose (show counter open errors, etc)"),
1203         OPT_INTEGER('r', "repeat", &run_count,
1204                     "repeat command and print average + stddev (max: 100, forever: 0)"),
1205         OPT_BOOLEAN('n', "null", &null_run,
1206                     "null run - dont start any counters"),
1207         OPT_INCR('d', "detailed", &detailed_run,
1208                     "detailed run - start a lot of events"),
1209         OPT_BOOLEAN('S', "sync", &sync_run,
1210                     "call sync() before starting a run"),
1211         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
1212                            "print large numbers with thousands\' separators",
1213                            stat__set_big_num),
1214         OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
1215                     "list of cpus to monitor in system-wide"),
1216         OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
1217                     "disable CPU count aggregation", AGGR_NONE),
1218         OPT_STRING('x', "field-separator", &csv_sep, "separator",
1219                    "print counts with custom separator"),
1220         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
1221                      "monitor event in cgroup name only", parse_cgroups),
1222         OPT_STRING('o', "output", &output_name, "file", "output file name"),
1223         OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
1224         OPT_INTEGER(0, "log-fd", &output_fd,
1225                     "log output to fd, instead of stderr"),
1226         OPT_STRING(0, "pre", &pre_cmd, "command",
1227                         "command to run prior to the measured command"),
1228         OPT_STRING(0, "post", &post_cmd, "command",
1229                         "command to run after to the measured command"),
1230         OPT_UINTEGER('I', "interval-print", &stat_config.interval,
1231                     "print counts at regular interval in ms (>= 10)"),
1232         OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
1233                      "aggregate counts per processor socket", AGGR_SOCKET),
1234         OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode,
1235                      "aggregate counts per physical processor core", AGGR_CORE),
1236         OPT_SET_UINT(0, "per-thread", &stat_config.aggr_mode,
1237                      "aggregate counts per thread", AGGR_THREAD),
1238         OPT_UINTEGER('D', "delay", &initial_delay,
1239                      "ms to wait before starting measurement after program start"),
1240         OPT_END()
1241 };
1242
1243 static int perf_stat__get_socket(struct cpu_map *map, int cpu)
1244 {
1245         return cpu_map__get_socket(map, cpu, NULL);
1246 }
1247
1248 static int perf_stat__get_core(struct cpu_map *map, int cpu)
1249 {
1250         return cpu_map__get_core(map, cpu, NULL);
1251 }
1252
1253 static int cpu_map__get_max(struct cpu_map *map)
1254 {
1255         int i, max = -1;
1256
1257         for (i = 0; i < map->nr; i++) {
1258                 if (map->map[i] > max)
1259                         max = map->map[i];
1260         }
1261
1262         return max;
1263 }
1264
1265 static struct cpu_map *cpus_aggr_map;
1266
1267 static int perf_stat__get_aggr(aggr_get_id_t get_id, struct cpu_map *map, int idx)
1268 {
1269         int cpu;
1270
1271         if (idx >= map->nr)
1272                 return -1;
1273
1274         cpu = map->map[idx];
1275
1276         if (cpus_aggr_map->map[cpu] == -1)
1277                 cpus_aggr_map->map[cpu] = get_id(map, idx);
1278
1279         return cpus_aggr_map->map[cpu];
1280 }
1281
1282 static int perf_stat__get_socket_cached(struct cpu_map *map, int idx)
1283 {
1284         return perf_stat__get_aggr(perf_stat__get_socket, map, idx);
1285 }
1286
1287 static int perf_stat__get_core_cached(struct cpu_map *map, int idx)
1288 {
1289         return perf_stat__get_aggr(perf_stat__get_core, map, idx);
1290 }
1291
1292 static int perf_stat_init_aggr_mode(void)
1293 {
1294         int nr;
1295
1296         switch (stat_config.aggr_mode) {
1297         case AGGR_SOCKET:
1298                 if (cpu_map__build_socket_map(evsel_list->cpus, &aggr_map)) {
1299                         perror("cannot build socket map");
1300                         return -1;
1301                 }
1302                 aggr_get_id = perf_stat__get_socket_cached;
1303                 break;
1304         case AGGR_CORE:
1305                 if (cpu_map__build_core_map(evsel_list->cpus, &aggr_map)) {
1306                         perror("cannot build core map");
1307                         return -1;
1308                 }
1309                 aggr_get_id = perf_stat__get_core_cached;
1310                 break;
1311         case AGGR_NONE:
1312         case AGGR_GLOBAL:
1313         case AGGR_THREAD:
1314         case AGGR_UNSET:
1315         default:
1316                 break;
1317         }
1318
1319         /*
1320          * The evsel_list->cpus is the base we operate on,
1321          * taking the highest cpu number to be the size of
1322          * the aggregation translate cpumap.
1323          */
1324         nr = cpu_map__get_max(evsel_list->cpus);
1325         cpus_aggr_map = cpu_map__empty_new(nr + 1);
1326         return cpus_aggr_map ? 0 : -ENOMEM;
1327 }
1328
1329 static void perf_stat__exit_aggr_mode(void)
1330 {
1331         cpu_map__put(aggr_map);
1332         cpu_map__put(cpus_aggr_map);
1333         aggr_map = NULL;
1334         cpus_aggr_map = NULL;
1335 }
1336
1337 static inline int perf_env__get_cpu(struct perf_env *env, struct cpu_map *map, int idx)
1338 {
1339         int cpu;
1340
1341         if (idx > map->nr)
1342                 return -1;
1343
1344         cpu = map->map[idx];
1345
1346         if (cpu >= env->nr_cpus_online)
1347                 return -1;
1348
1349         return cpu;
1350 }
1351
1352 static int perf_env__get_socket(struct cpu_map *map, int idx, void *data)
1353 {
1354         struct perf_env *env = data;
1355         int cpu = perf_env__get_cpu(env, map, idx);
1356
1357         return cpu == -1 ? -1 : env->cpu[cpu].socket_id;
1358 }
1359
1360 static int perf_env__get_core(struct cpu_map *map, int idx, void *data)
1361 {
1362         struct perf_env *env = data;
1363         int core = -1, cpu = perf_env__get_cpu(env, map, idx);
1364
1365         if (cpu != -1) {
1366                 int socket_id = env->cpu[cpu].socket_id;
1367
1368                 /*
1369                  * Encode socket in upper 16 bits
1370                  * core_id is relative to socket, and
1371                  * we need a global id. So we combine
1372                  * socket + core id.
1373                  */
1374                 core = (socket_id << 16) | (env->cpu[cpu].core_id & 0xffff);
1375         }
1376
1377         return core;
1378 }
1379
1380 static int perf_env__build_socket_map(struct perf_env *env, struct cpu_map *cpus,
1381                                       struct cpu_map **sockp)
1382 {
1383         return cpu_map__build_map(cpus, sockp, perf_env__get_socket, env);
1384 }
1385
1386 static int perf_env__build_core_map(struct perf_env *env, struct cpu_map *cpus,
1387                                     struct cpu_map **corep)
1388 {
1389         return cpu_map__build_map(cpus, corep, perf_env__get_core, env);
1390 }
1391
1392 static int perf_stat__get_socket_file(struct cpu_map *map, int idx)
1393 {
1394         return perf_env__get_socket(map, idx, &perf_stat.session->header.env);
1395 }
1396
1397 static int perf_stat__get_core_file(struct cpu_map *map, int idx)
1398 {
1399         return perf_env__get_core(map, idx, &perf_stat.session->header.env);
1400 }
1401
1402 static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
1403 {
1404         struct perf_env *env = &st->session->header.env;
1405
1406         switch (stat_config.aggr_mode) {
1407         case AGGR_SOCKET:
1408                 if (perf_env__build_socket_map(env, evsel_list->cpus, &aggr_map)) {
1409                         perror("cannot build socket map");
1410                         return -1;
1411                 }
1412                 aggr_get_id = perf_stat__get_socket_file;
1413                 break;
1414         case AGGR_CORE:
1415                 if (perf_env__build_core_map(env, evsel_list->cpus, &aggr_map)) {
1416                         perror("cannot build core map");
1417                         return -1;
1418                 }
1419                 aggr_get_id = perf_stat__get_core_file;
1420                 break;
1421         case AGGR_NONE:
1422         case AGGR_GLOBAL:
1423         case AGGR_THREAD:
1424         case AGGR_UNSET:
1425         default:
1426                 break;
1427         }
1428
1429         return 0;
1430 }
1431
1432 /*
1433  * Add default attributes, if there were no attributes specified or
1434  * if -d/--detailed, -d -d or -d -d -d is used:
1435  */
1436 static int add_default_attributes(void)
1437 {
1438         struct perf_event_attr default_attrs[] = {
1439
1440   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
1441   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
1442   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
1443   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
1444
1445   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
1446   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
1447   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
1448   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
1449   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
1450   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
1451
1452 };
1453
1454 /*
1455  * Detailed stats (-d), covering the L1 and last level data caches:
1456  */
1457         struct perf_event_attr detailed_attrs[] = {
1458
1459   { .type = PERF_TYPE_HW_CACHE,
1460     .config =
1461          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1462         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1463         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1464
1465   { .type = PERF_TYPE_HW_CACHE,
1466     .config =
1467          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1468         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1469         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1470
1471   { .type = PERF_TYPE_HW_CACHE,
1472     .config =
1473          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1474         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1475         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1476
1477   { .type = PERF_TYPE_HW_CACHE,
1478     .config =
1479          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1480         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1481         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1482 };
1483
1484 /*
1485  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
1486  */
1487         struct perf_event_attr very_detailed_attrs[] = {
1488
1489   { .type = PERF_TYPE_HW_CACHE,
1490     .config =
1491          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1492         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1493         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1494
1495   { .type = PERF_TYPE_HW_CACHE,
1496     .config =
1497          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1498         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1499         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1500
1501   { .type = PERF_TYPE_HW_CACHE,
1502     .config =
1503          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1504         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1505         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1506
1507   { .type = PERF_TYPE_HW_CACHE,
1508     .config =
1509          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1510         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1511         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1512
1513   { .type = PERF_TYPE_HW_CACHE,
1514     .config =
1515          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1516         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1517         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1518
1519   { .type = PERF_TYPE_HW_CACHE,
1520     .config =
1521          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1522         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1523         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1524
1525 };
1526
1527 /*
1528  * Very, very detailed stats (-d -d -d), adding prefetch events:
1529  */
1530         struct perf_event_attr very_very_detailed_attrs[] = {
1531
1532   { .type = PERF_TYPE_HW_CACHE,
1533     .config =
1534          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1535         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1536         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1537
1538   { .type = PERF_TYPE_HW_CACHE,
1539     .config =
1540          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1541         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1542         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1543 };
1544
1545         /* Set attrs if no event is selected and !null_run: */
1546         if (null_run)
1547                 return 0;
1548
1549         if (transaction_run) {
1550                 int err;
1551                 if (pmu_have_event("cpu", "cycles-ct") &&
1552                     pmu_have_event("cpu", "el-start"))
1553                         err = parse_events(evsel_list, transaction_attrs, NULL);
1554                 else
1555                         err = parse_events(evsel_list, transaction_limited_attrs, NULL);
1556                 if (err) {
1557                         fprintf(stderr, "Cannot set up transaction events\n");
1558                         return -1;
1559                 }
1560                 return 0;
1561         }
1562
1563         if (!evsel_list->nr_entries) {
1564                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs) < 0)
1565                         return -1;
1566         }
1567
1568         /* Detailed events get appended to the event list: */
1569
1570         if (detailed_run <  1)
1571                 return 0;
1572
1573         /* Append detailed run extra attributes: */
1574         if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
1575                 return -1;
1576
1577         if (detailed_run < 2)
1578                 return 0;
1579
1580         /* Append very detailed run extra attributes: */
1581         if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
1582                 return -1;
1583
1584         if (detailed_run < 3)
1585                 return 0;
1586
1587         /* Append very, very detailed run extra attributes: */
1588         return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
1589 }
1590
1591 static const char * const stat_record_usage[] = {
1592         "perf stat record [<options>]",
1593         NULL,
1594 };
1595
1596 static void init_features(struct perf_session *session)
1597 {
1598         int feat;
1599
1600         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1601                 perf_header__set_feat(&session->header, feat);
1602
1603         perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1604         perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1605         perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1606         perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1607 }
1608
1609 static int __cmd_record(int argc, const char **argv)
1610 {
1611         struct perf_session *session;
1612         struct perf_data_file *file = &perf_stat.file;
1613
1614         argc = parse_options(argc, argv, stat_options, stat_record_usage,
1615                              PARSE_OPT_STOP_AT_NON_OPTION);
1616
1617         if (output_name)
1618                 file->path = output_name;
1619
1620         if (run_count != 1 || forever) {
1621                 pr_err("Cannot use -r option with perf stat record.\n");
1622                 return -1;
1623         }
1624
1625         session = perf_session__new(file, false, NULL);
1626         if (session == NULL) {
1627                 pr_err("Perf session creation failed.\n");
1628                 return -1;
1629         }
1630
1631         init_features(session);
1632
1633         session->evlist   = evsel_list;
1634         perf_stat.session = session;
1635         perf_stat.record  = true;
1636         return argc;
1637 }
1638
1639 static int process_stat_round_event(struct perf_tool *tool __maybe_unused,
1640                                     union perf_event *event,
1641                                     struct perf_session *session)
1642 {
1643         struct stat_round_event *round = &event->stat_round;
1644         struct perf_evsel *counter;
1645         struct timespec tsh, *ts = NULL;
1646         const char **argv = session->header.env.cmdline_argv;
1647         int argc = session->header.env.nr_cmdline;
1648
1649         evlist__for_each(evsel_list, counter)
1650                 perf_stat_process_counter(&stat_config, counter);
1651
1652         if (round->type == PERF_STAT_ROUND_TYPE__FINAL)
1653                 update_stats(&walltime_nsecs_stats, round->time);
1654
1655         if (stat_config.interval && round->time) {
1656                 tsh.tv_sec  = round->time / NSECS_PER_SEC;
1657                 tsh.tv_nsec = round->time % NSECS_PER_SEC;
1658                 ts = &tsh;
1659         }
1660
1661         print_counters(ts, argc, argv);
1662         return 0;
1663 }
1664
1665 static
1666 int process_stat_config_event(struct perf_tool *tool __maybe_unused,
1667                               union perf_event *event,
1668                               struct perf_session *session __maybe_unused)
1669 {
1670         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1671
1672         perf_event__read_stat_config(&stat_config, &event->stat_config);
1673
1674         if (cpu_map__empty(st->cpus)) {
1675                 if (st->aggr_mode != AGGR_UNSET)
1676                         pr_warning("warning: processing task data, aggregation mode not set\n");
1677                 return 0;
1678         }
1679
1680         if (st->aggr_mode != AGGR_UNSET)
1681                 stat_config.aggr_mode = st->aggr_mode;
1682
1683         if (perf_stat.file.is_pipe)
1684                 perf_stat_init_aggr_mode();
1685         else
1686                 perf_stat_init_aggr_mode_file(st);
1687
1688         return 0;
1689 }
1690
1691 static int set_maps(struct perf_stat *st)
1692 {
1693         if (!st->cpus || !st->threads)
1694                 return 0;
1695
1696         if (WARN_ONCE(st->maps_allocated, "stats double allocation\n"))
1697                 return -EINVAL;
1698
1699         perf_evlist__set_maps(evsel_list, st->cpus, st->threads);
1700
1701         if (perf_evlist__alloc_stats(evsel_list, true))
1702                 return -ENOMEM;
1703
1704         st->maps_allocated = true;
1705         return 0;
1706 }
1707
1708 static
1709 int process_thread_map_event(struct perf_tool *tool __maybe_unused,
1710                              union perf_event *event,
1711                              struct perf_session *session __maybe_unused)
1712 {
1713         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1714
1715         if (st->threads) {
1716                 pr_warning("Extra thread map event, ignoring.\n");
1717                 return 0;
1718         }
1719
1720         st->threads = thread_map__new_event(&event->thread_map);
1721         if (!st->threads)
1722                 return -ENOMEM;
1723
1724         return set_maps(st);
1725 }
1726
1727 static
1728 int process_cpu_map_event(struct perf_tool *tool __maybe_unused,
1729                           union perf_event *event,
1730                           struct perf_session *session __maybe_unused)
1731 {
1732         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1733         struct cpu_map *cpus;
1734
1735         if (st->cpus) {
1736                 pr_warning("Extra cpu map event, ignoring.\n");
1737                 return 0;
1738         }
1739
1740         cpus = cpu_map__new_data(&event->cpu_map.data);
1741         if (!cpus)
1742                 return -ENOMEM;
1743
1744         st->cpus = cpus;
1745         return set_maps(st);
1746 }
1747
1748 static const char * const stat_report_usage[] = {
1749         "perf stat report [<options>]",
1750         NULL,
1751 };
1752
1753 static struct perf_stat perf_stat = {
1754         .tool = {
1755                 .attr           = perf_event__process_attr,
1756                 .event_update   = perf_event__process_event_update,
1757                 .thread_map     = process_thread_map_event,
1758                 .cpu_map        = process_cpu_map_event,
1759                 .stat_config    = process_stat_config_event,
1760                 .stat           = perf_event__process_stat_event,
1761                 .stat_round     = process_stat_round_event,
1762         },
1763         .aggr_mode = AGGR_UNSET,
1764 };
1765
1766 static int __cmd_report(int argc, const char **argv)
1767 {
1768         struct perf_session *session;
1769         const struct option options[] = {
1770         OPT_STRING('i', "input", &input_name, "file", "input file name"),
1771         OPT_SET_UINT(0, "per-socket", &perf_stat.aggr_mode,
1772                      "aggregate counts per processor socket", AGGR_SOCKET),
1773         OPT_SET_UINT(0, "per-core", &perf_stat.aggr_mode,
1774                      "aggregate counts per physical processor core", AGGR_CORE),
1775         OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
1776                      "disable CPU count aggregation", AGGR_NONE),
1777         OPT_END()
1778         };
1779         struct stat st;
1780         int ret;
1781
1782         argc = parse_options(argc, argv, options, stat_report_usage, 0);
1783
1784         if (!input_name || !strlen(input_name)) {
1785                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
1786                         input_name = "-";
1787                 else
1788                         input_name = "perf.data";
1789         }
1790
1791         perf_stat.file.path = input_name;
1792         perf_stat.file.mode = PERF_DATA_MODE_READ;
1793
1794         session = perf_session__new(&perf_stat.file, false, &perf_stat.tool);
1795         if (session == NULL)
1796                 return -1;
1797
1798         perf_stat.session  = session;
1799         stat_config.output = stderr;
1800         evsel_list         = session->evlist;
1801
1802         ret = perf_session__process_events(session);
1803         if (ret)
1804                 return ret;
1805
1806         perf_session__delete(session);
1807         return 0;
1808 }
1809
1810 int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
1811 {
1812         const char * const stat_usage[] = {
1813                 "perf stat [<options>] [<command>]",
1814                 NULL
1815         };
1816         int status = -EINVAL, run_idx;
1817         const char *mode;
1818         FILE *output = stderr;
1819         unsigned int interval;
1820         const char * const stat_subcommands[] = { "record", "report" };
1821
1822         setlocale(LC_ALL, "");
1823
1824         evsel_list = perf_evlist__new();
1825         if (evsel_list == NULL)
1826                 return -ENOMEM;
1827
1828         argc = parse_options_subcommand(argc, argv, stat_options, stat_subcommands,
1829                                         (const char **) stat_usage,
1830                                         PARSE_OPT_STOP_AT_NON_OPTION);
1831
1832         if (csv_sep) {
1833                 csv_output = true;
1834                 if (!strcmp(csv_sep, "\\t"))
1835                         csv_sep = "\t";
1836         } else
1837                 csv_sep = DEFAULT_SEPARATOR;
1838
1839         if (argc && !strncmp(argv[0], "rec", 3)) {
1840                 argc = __cmd_record(argc, argv);
1841                 if (argc < 0)
1842                         return -1;
1843         } else if (argc && !strncmp(argv[0], "rep", 3))
1844                 return __cmd_report(argc, argv);
1845
1846         interval = stat_config.interval;
1847
1848         /*
1849          * For record command the -o is already taken care of.
1850          */
1851         if (!STAT_RECORD && output_name && strcmp(output_name, "-"))
1852                 output = NULL;
1853
1854         if (output_name && output_fd) {
1855                 fprintf(stderr, "cannot use both --output and --log-fd\n");
1856                 parse_options_usage(stat_usage, stat_options, "o", 1);
1857                 parse_options_usage(NULL, stat_options, "log-fd", 0);
1858                 goto out;
1859         }
1860
1861         if (output_fd < 0) {
1862                 fprintf(stderr, "argument to --log-fd must be a > 0\n");
1863                 parse_options_usage(stat_usage, stat_options, "log-fd", 0);
1864                 goto out;
1865         }
1866
1867         if (!output) {
1868                 struct timespec tm;
1869                 mode = append_file ? "a" : "w";
1870
1871                 output = fopen(output_name, mode);
1872                 if (!output) {
1873                         perror("failed to create output file");
1874                         return -1;
1875                 }
1876                 clock_gettime(CLOCK_REALTIME, &tm);
1877                 fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
1878         } else if (output_fd > 0) {
1879                 mode = append_file ? "a" : "w";
1880                 output = fdopen(output_fd, mode);
1881                 if (!output) {
1882                         perror("Failed opening logfd");
1883                         return -errno;
1884                 }
1885         }
1886
1887         stat_config.output = output;
1888
1889         /*
1890          * let the spreadsheet do the pretty-printing
1891          */
1892         if (csv_output) {
1893                 /* User explicitly passed -B? */
1894                 if (big_num_opt == 1) {
1895                         fprintf(stderr, "-B option not supported with -x\n");
1896                         parse_options_usage(stat_usage, stat_options, "B", 1);
1897                         parse_options_usage(NULL, stat_options, "x", 1);
1898                         goto out;
1899                 } else /* Nope, so disable big number formatting */
1900                         big_num = false;
1901         } else if (big_num_opt == 0) /* User passed --no-big-num */
1902                 big_num = false;
1903
1904         if (!argc && target__none(&target))
1905                 usage_with_options(stat_usage, stat_options);
1906
1907         if (run_count < 0) {
1908                 pr_err("Run count must be a positive number\n");
1909                 parse_options_usage(stat_usage, stat_options, "r", 1);
1910                 goto out;
1911         } else if (run_count == 0) {
1912                 forever = true;
1913                 run_count = 1;
1914         }
1915
1916         if ((stat_config.aggr_mode == AGGR_THREAD) && !target__has_task(&target)) {
1917                 fprintf(stderr, "The --per-thread option is only available "
1918                         "when monitoring via -p -t options.\n");
1919                 parse_options_usage(NULL, stat_options, "p", 1);
1920                 parse_options_usage(NULL, stat_options, "t", 1);
1921                 goto out;
1922         }
1923
1924         /*
1925          * no_aggr, cgroup are for system-wide only
1926          * --per-thread is aggregated per thread, we dont mix it with cpu mode
1927          */
1928         if (((stat_config.aggr_mode != AGGR_GLOBAL &&
1929               stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
1930             !target__has_cpu(&target)) {
1931                 fprintf(stderr, "both cgroup and no-aggregation "
1932                         "modes only available in system-wide mode\n");
1933
1934                 parse_options_usage(stat_usage, stat_options, "G", 1);
1935                 parse_options_usage(NULL, stat_options, "A", 1);
1936                 parse_options_usage(NULL, stat_options, "a", 1);
1937                 goto out;
1938         }
1939
1940         if (add_default_attributes())
1941                 goto out;
1942
1943         target__validate(&target);
1944
1945         if (perf_evlist__create_maps(evsel_list, &target) < 0) {
1946                 if (target__has_task(&target)) {
1947                         pr_err("Problems finding threads of monitor\n");
1948                         parse_options_usage(stat_usage, stat_options, "p", 1);
1949                         parse_options_usage(NULL, stat_options, "t", 1);
1950                 } else if (target__has_cpu(&target)) {
1951                         perror("failed to parse CPUs map");
1952                         parse_options_usage(stat_usage, stat_options, "C", 1);
1953                         parse_options_usage(NULL, stat_options, "a", 1);
1954                 }
1955                 goto out;
1956         }
1957
1958         /*
1959          * Initialize thread_map with comm names,
1960          * so we could print it out on output.
1961          */
1962         if (stat_config.aggr_mode == AGGR_THREAD)
1963                 thread_map__read_comms(evsel_list->threads);
1964
1965         if (interval && interval < 100) {
1966                 if (interval < 10) {
1967                         pr_err("print interval must be >= 10ms\n");
1968                         parse_options_usage(stat_usage, stat_options, "I", 1);
1969                         goto out;
1970                 } else
1971                         pr_warning("print interval < 100ms. "
1972                                    "The overhead percentage could be high in some cases. "
1973                                    "Please proceed with caution.\n");
1974         }
1975
1976         if (perf_evlist__alloc_stats(evsel_list, interval))
1977                 goto out;
1978
1979         if (perf_stat_init_aggr_mode())
1980                 goto out;
1981
1982         /*
1983          * We dont want to block the signals - that would cause
1984          * child tasks to inherit that and Ctrl-C would not work.
1985          * What we want is for Ctrl-C to work in the exec()-ed
1986          * task, but being ignored by perf stat itself:
1987          */
1988         atexit(sig_atexit);
1989         if (!forever)
1990                 signal(SIGINT,  skip_signal);
1991         signal(SIGCHLD, skip_signal);
1992         signal(SIGALRM, skip_signal);
1993         signal(SIGABRT, skip_signal);
1994
1995         status = 0;
1996         for (run_idx = 0; forever || run_idx < run_count; run_idx++) {
1997                 if (run_count != 1 && verbose)
1998                         fprintf(output, "[ perf stat: executing run #%d ... ]\n",
1999                                 run_idx + 1);
2000
2001                 status = run_perf_stat(argc, argv);
2002                 if (forever && status != -1) {
2003                         print_counters(NULL, argc, argv);
2004                         perf_stat__reset_stats();
2005                 }
2006         }
2007
2008         if (!forever && status != -1 && !interval)
2009                 print_counters(NULL, argc, argv);
2010
2011         if (STAT_RECORD) {
2012                 /*
2013                  * We synthesize the kernel mmap record just so that older tools
2014                  * don't emit warnings about not being able to resolve symbols
2015                  * due to /proc/sys/kernel/kptr_restrict settings and instear provide
2016                  * a saner message about no samples being in the perf.data file.
2017                  *
2018                  * This also serves to suppress a warning about f_header.data.size == 0
2019                  * in header.c at the moment 'perf stat record' gets introduced, which
2020                  * is not really needed once we start adding the stat specific PERF_RECORD_
2021                  * records, but the need to suppress the kptr_restrict messages in older
2022                  * tools remain  -acme
2023                  */
2024                 int fd = perf_data_file__fd(&perf_stat.file);
2025                 int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
2026                                                              process_synthesized_event,
2027                                                              &perf_stat.session->machines.host);
2028                 if (err) {
2029                         pr_warning("Couldn't synthesize the kernel mmap record, harmless, "
2030                                    "older tools may produce warnings about this file\n.");
2031                 }
2032
2033                 if (!interval) {
2034                         if (WRITE_STAT_ROUND_EVENT(walltime_nsecs_stats.max, FINAL))
2035                                 pr_err("failed to write stat round event\n");
2036                 }
2037
2038                 if (!perf_stat.file.is_pipe) {
2039                         perf_stat.session->header.data_size += perf_stat.bytes_written;
2040                         perf_session__write_header(perf_stat.session, evsel_list, fd, true);
2041                 }
2042
2043                 perf_session__delete(perf_stat.session);
2044         }
2045
2046         perf_stat__exit_aggr_mode();
2047         perf_evlist__free_stats(evsel_list);
2048 out:
2049         perf_evlist__delete(evsel_list);
2050         return status;
2051 }