tools/perf/builtin-stat.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * builtin-stat.c
   4  *
   5  * Builtin stat command: Give a precise performance counters summary
   6  * overview about any workload, CPU or specific PID.
   7  *
   8  * Sample output:
   9
  10    $ perf stat ./hackbench 10
  11
  12   Time: 0.118
  13
  14   Performance counter stats for './hackbench 10':
  15
  16        1708.761321 task-clock                #   11.037 CPUs utilized
  17             41,190 context-switches          #    0.024 M/sec
  18              6,735 CPU-migrations            #    0.004 M/sec
  19             17,318 page-faults               #    0.010 M/sec
  20      5,205,202,243 cycles                    #    3.046 GHz
  21      3,856,436,920 stalled-cycles-frontend   #   74.09% frontend cycles idle
  22      1,600,790,871 stalled-cycles-backend    #   30.75% backend  cycles idle
  23      2,603,501,247 instructions              #    0.50  insns per cycle
  24                                              #    1.48  stalled cycles per insn
  25        484,357,498 branches                  #  283.455 M/sec
  26          6,388,934 branch-misses             #    1.32% of all branches
  27
  28         0.154822978  seconds time elapsed
  29
  30  *
  31  * Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
  32  *
  33  * Improvements and fixes by:
  34  *
  35  *   Arjan van de Ven <arjan@linux.intel.com>
  36  *   Yanmin Zhang <yanmin.zhang@intel.com>
  37  *   Wu Fengguang <fengguang.wu@intel.com>
  38  *   Mike Galbraith <efault@gmx.de>
  39  *   Paul Mackerras <paulus@samba.org>
  40  *   Jaswinder Singh Rajput <jaswinder@kernel.org>
  41  */
  42
  43 #include "perf.h"
  44 #include "builtin.h"
  45 #include "util/cgroup.h"
  46 #include <subcmd/parse-options.h>
  47 #include "util/parse-events.h"
  48 #include "util/pmu.h"
  49 #include "util/event.h"
  50 #include "util/evlist.h"
  51 #include "util/evsel.h"
  52 #include "util/debug.h"
  53 #include "util/color.h"
  54 #include "util/stat.h"
  55 #include "util/header.h"
  56 #include "util/cpumap.h"
  57 #include "util/thread.h"
  58 #include "util/thread_map.h"
  59 #include "util/counts.h"
  60 #include "util/group.h"
  61 #include "util/session.h"
  62 #include "util/tool.h"
  63 #include "util/string2.h"
  64 #include "util/metricgroup.h"
  65 #include "util/top.h"
  66 #include "asm/bug.h"
  67
  68 #include <linux/time64.h>
  69 #include <linux/zalloc.h>
  70 #include <api/fs/fs.h>
  71 #include <errno.h>
  72 #include <signal.h>
  73 #include <stdlib.h>
  74 #include <sys/prctl.h>
  75 #include <inttypes.h>
  76 #include <locale.h>
  77 #include <math.h>
  78 #include <sys/types.h>
  79 #include <sys/stat.h>
  80 #include <sys/wait.h>
  81 #include <unistd.h>
  82 #include <sys/time.h>
  83 #include <sys/resource.h>
  84
  85 #include <linux/ctype.h>
  86
  87 #define DEFAULT_SEPARATOR       " "
  88 #define FREEZE_ON_SMI_PATH      "devices/cpu/freeze_on_smi"
  89
  90 static void print_counters(struct timespec *ts, int argc, const char **argv);
  91
  92 /* Default events used for perf stat -T */
  93 static const char *transaction_attrs = {
  94         "task-clock,"
  95         "{"
  96         "instructions,"
  97         "cycles,"
  98         "cpu/cycles-t/,"
  99         "cpu/tx-start/,"
 100         "cpu/el-start/,"
 101         "cpu/cycles-ct/"
 102         "}"
 103 };
 104
 105 /* More limited version when the CPU does not have all events. */
 106 static const char * transaction_limited_attrs = {
 107         "task-clock,"
 108         "{"
 109         "instructions,"
 110         "cycles,"
 111         "cpu/cycles-t/,"
 112         "cpu/tx-start/"
 113         "}"
 114 };
 115
 116 static const char * topdown_attrs[] = {
 117         "topdown-total-slots",
 118         "topdown-slots-retired",
 119         "topdown-recovery-bubbles",
 120         "topdown-fetch-bubbles",
 121         "topdown-slots-issued",
 122         NULL,
 123 };
 124
 125 static const char *smi_cost_attrs = {
 126         "{"
 127         "msr/aperf/,"
 128         "msr/smi/,"
 129         "cycles"
 130         "}"
 131 };
 132
 133 static struct perf_evlist       *evsel_list;
 134
 135 static struct target target = {
 136         .uid    = UINT_MAX,
 137 };
 138
 139 #define METRIC_ONLY_LEN 20
 140
 141 static volatile pid_t           child_pid                       = -1;
 142 static int                      detailed_run                    =  0;
 143 static bool                     transaction_run;
 144 static bool                     topdown_run                     = false;
 145 static bool                     smi_cost                        = false;
 146 static bool                     smi_reset                       = false;
 147 static int                      big_num_opt                     =  -1;
 148 static bool                     group                           = false;
 149 static const char               *pre_cmd                        = NULL;
 150 static const char               *post_cmd                       = NULL;
 151 static bool                     sync_run                        = false;
 152 static bool                     forever                         = false;
 153 static bool                     force_metric_only               = false;
 154 static struct timespec          ref_time;
 155 static bool                     append_file;
 156 static bool                     interval_count;
 157 static const char               *output_name;
 158 static int                      output_fd;
 159
 160 struct perf_stat {
 161         bool                     record;
 162         struct perf_data         data;
 163         struct perf_session     *session;
 164         u64                      bytes_written;
 165         struct perf_tool         tool;
 166         bool                     maps_allocated;
 167         struct cpu_map          *cpus;
 168         struct thread_map       *threads;
 169         enum aggr_mode           aggr_mode;
 170 };
 171
 172 static struct perf_stat         perf_stat;
 173 #define STAT_RECORD             perf_stat.record
 174
 175 static volatile int done = 0;
 176
 177 static struct perf_stat_config stat_config = {
 178         .aggr_mode              = AGGR_GLOBAL,
 179         .scale                  = true,
 180         .unit_width             = 4, /* strlen("unit") */
 181         .run_count              = 1,
 182         .metric_only_len        = METRIC_ONLY_LEN,
 183         .walltime_nsecs_stats   = &walltime_nsecs_stats,
 184         .big_num                = true,
 185 };
 186
 187 static inline void diff_timespec(struct timespec *r, struct timespec *a,
 188                                  struct timespec *b)
 189 {
 190         r->tv_sec = a->tv_sec - b->tv_sec;
 191         if (a->tv_nsec < b->tv_nsec) {
 192                 r->tv_nsec = a->tv_nsec + NSEC_PER_SEC - b->tv_nsec;
 193                 r->tv_sec--;
 194         } else {
 195                 r->tv_nsec = a->tv_nsec - b->tv_nsec ;
 196         }
 197 }
 198
 199 static void perf_stat__reset_stats(void)
 200 {
 201         int i;
 202
 203         perf_evlist__reset_stats(evsel_list);
 204         perf_stat__reset_shadow_stats();
 205
 206         for (i = 0; i < stat_config.stats_num; i++)
 207                 perf_stat__reset_shadow_per_stat(&stat_config.stats[i]);
 208 }
 209
 210 static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
 211                                      union perf_event *event,
 212                                      struct perf_sample *sample __maybe_unused,
 213                                      struct machine *machine __maybe_unused)
 214 {
 215         if (perf_data__write(&perf_stat.data, event, event->header.size) < 0) {
 216                 pr_err("failed to write perf data, error: %m\n");
 217                 return -1;
 218         }
 219
 220         perf_stat.bytes_written += event->header.size;
 221         return 0;
 222 }
 223
 224 static int write_stat_round_event(u64 tm, u64 type)
 225 {
 226         return perf_event__synthesize_stat_round(NULL, tm, type,
 227                                                  process_synthesized_event,
 228                                                  NULL);
 229 }
 230
 231 #define WRITE_STAT_ROUND_EVENT(time, interval) \
 232         write_stat_round_event(time, PERF_STAT_ROUND_TYPE__ ## interval)
 233
 234 #define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
 235
 236 static int
 237 perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
 238                              struct perf_counts_values *count)
 239 {
 240         struct perf_sample_id *sid = SID(counter, cpu, thread);
 241
 242         return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
 243                                            process_synthesized_event, NULL);
 244 }
 245
 246 static int read_single_counter(struct perf_evsel *counter, int cpu,
 247                                int thread, struct timespec *rs)
 248 {
 249         if (counter->tool_event == PERF_TOOL_DURATION_TIME) {
 250                 u64 val = rs->tv_nsec + rs->tv_sec*1000000000ULL;
 251                 struct perf_counts_values *count =
 252                         perf_counts(counter->counts, cpu, thread);
 253                 count->ena = count->run = val;
 254                 count->val = val;
 255                 return 0;
 256         }
 257         return perf_evsel__read_counter(counter, cpu, thread);
 258 }
 259
 260 /*
 261  * Read out the results of a single counter:
 262  * do not aggregate counts across CPUs in system-wide mode
 263  */
 264 static int read_counter(struct perf_evsel *counter, struct timespec *rs)
 265 {
 266         int nthreads = thread_map__nr(evsel_list->threads);
 267         int ncpus, cpu, thread;
 268
 269         if (target__has_cpu(&target) && !target__has_per_thread(&target))
 270                 ncpus = perf_evsel__nr_cpus(counter);
 271         else
 272                 ncpus = 1;
 273
 274         if (!counter->supported)
 275                 return -ENOENT;
 276
 277         if (counter->system_wide)
 278                 nthreads = 1;
 279
 280         for (thread = 0; thread < nthreads; thread++) {
 281                 for (cpu = 0; cpu < ncpus; cpu++) {
 282                         struct perf_counts_values *count;
 283
 284                         count = perf_counts(counter->counts, cpu, thread);
 285
 286                         /*
 287                          * The leader's group read loads data into its group members
 288                          * (via perf_evsel__read_counter) and sets threir count->loaded.
 289                          */
 290                         if (!count->loaded &&
 291                             read_single_counter(counter, cpu, thread, rs)) {
 292                                 counter->counts->scaled = -1;
 293                                 perf_counts(counter->counts, cpu, thread)->ena = 0;
 294                                 perf_counts(counter->counts, cpu, thread)->run = 0;
 295                                 return -1;
 296                         }
 297
 298                         count->loaded = false;
 299
 300                         if (STAT_RECORD) {
 301                                 if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
 302                                         pr_err("failed to write stat event\n");
 303                                         return -1;
 304                                 }
 305                         }
 306
 307                         if (verbose > 1) {
 308                                 fprintf(stat_config.output,
 309                                         "%s: %d: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 310                                                 perf_evsel__name(counter),
 311                                                 cpu,
 312                                                 count->val, count->ena, count->run);
 313                         }
 314                 }
 315         }
 316
 317         return 0;
 318 }
 319
 320 static void read_counters(struct timespec *rs)
 321 {
 322         struct perf_evsel *counter;
 323         int ret;
 324
 325         evlist__for_each_entry(evsel_list, counter) {
 326                 ret = read_counter(counter, rs);
 327                 if (ret)
 328                         pr_debug("failed to read counter %s\n", counter->name);
 329
 330                 if (ret == 0 && perf_stat_process_counter(&stat_config, counter))
 331                         pr_warning("failed to process counter %s\n", counter->name);
 332         }
 333 }
 334
 335 static void process_interval(void)
 336 {
 337         struct timespec ts, rs;
 338
 339         clock_gettime(CLOCK_MONOTONIC, &ts);
 340         diff_timespec(&rs, &ts, &ref_time);
 341
 342         read_counters(&rs);
 343
 344         if (STAT_RECORD) {
 345                 if (WRITE_STAT_ROUND_EVENT(rs.tv_sec * NSEC_PER_SEC + rs.tv_nsec, INTERVAL))
 346                         pr_err("failed to write stat round event\n");
 347         }
 348
 349         init_stats(&walltime_nsecs_stats);
 350         update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
 351         print_counters(&rs, 0, NULL);
 352 }
 353
 354 static void enable_counters(void)
 355 {
 356         if (stat_config.initial_delay)
 357                 usleep(stat_config.initial_delay * USEC_PER_MSEC);
 358
 359         /*
 360          * We need to enable counters only if:
 361          * - we don't have tracee (attaching to task or cpu)
 362          * - we have initial delay configured
 363          */
 364         if (!target__none(&target) || stat_config.initial_delay)
 365                 perf_evlist__enable(evsel_list);
 366 }
 367
 368 static void disable_counters(void)
 369 {
 370         /*
 371          * If we don't have tracee (attaching to task or cpu), counters may
 372          * still be running. To get accurate group ratios, we must stop groups
 373          * from counting before reading their constituent counters.
 374          */
 375         if (!target__none(&target))
 376                 perf_evlist__disable(evsel_list);
 377 }
 378
 379 static volatile int workload_exec_errno;
 380
 381 /*
 382  * perf_evlist__prepare_workload will send a SIGUSR1
 383  * if the fork fails, since we asked by setting its
 384  * want_signal to true.
 385  */
 386 static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
 387                                         void *ucontext __maybe_unused)
 388 {
 389         workload_exec_errno = info->si_value.sival_int;
 390 }
 391
 392 static bool perf_evsel__should_store_id(struct perf_evsel *counter)
 393 {
 394         return STAT_RECORD || counter->attr.read_format & PERF_FORMAT_ID;
 395 }
 396
 397 static bool is_target_alive(struct target *_target,
 398                             struct thread_map *threads)
 399 {
 400         struct stat st;
 401         int i;
 402
 403         if (!target__has_task(_target))
 404                 return true;
 405
 406         for (i = 0; i < threads->nr; i++) {
 407                 char path[PATH_MAX];
 408
 409                 scnprintf(path, PATH_MAX, "%s/%d", procfs__mountpoint(),
 410                           threads->map[i].pid);
 411
 412                 if (!stat(path, &st))
 413                         return true;
 414         }
 415
 416         return false;
 417 }
 418
 419 static int __run_perf_stat(int argc, const char **argv, int run_idx)
 420 {
 421         int interval = stat_config.interval;
 422         int times = stat_config.times;
 423         int timeout = stat_config.timeout;
 424         char msg[BUFSIZ];
 425         unsigned long long t0, t1;
 426         struct perf_evsel *counter;
 427         struct timespec ts;
 428         size_t l;
 429         int status = 0;
 430         const bool forks = (argc > 0);
 431         bool is_pipe = STAT_RECORD ? perf_stat.data.is_pipe : false;
 432
 433         if (interval) {
 434                 ts.tv_sec  = interval / USEC_PER_MSEC;
 435                 ts.tv_nsec = (interval % USEC_PER_MSEC) * NSEC_PER_MSEC;
 436         } else if (timeout) {
 437                 ts.tv_sec  = timeout / USEC_PER_MSEC;
 438                 ts.tv_nsec = (timeout % USEC_PER_MSEC) * NSEC_PER_MSEC;
 439         } else {
 440                 ts.tv_sec  = 1;
 441                 ts.tv_nsec = 0;
 442         }
 443
 444         if (forks) {
 445                 if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
 446                                                   workload_exec_failed_signal) < 0) {
 447                         perror("failed to prepare workload");
 448                         return -1;
 449                 }
 450                 child_pid = evsel_list->workload.pid;
 451         }
 452
 453         if (group)
 454                 perf_evlist__set_leader(evsel_list);
 455
 456         evlist__for_each_entry(evsel_list, counter) {
 457 try_again:
 458                 if (create_perf_stat_counter(counter, &stat_config, &target) < 0) {
 459
 460                         /* Weak group failed. Reset the group. */
 461                         if ((errno == EINVAL || errno == EBADF) &&
 462                             counter->leader != counter &&
 463                             counter->weak_group) {
 464                                 counter = perf_evlist__reset_weak_group(evsel_list, counter);
 465                                 goto try_again;
 466                         }
 467
 468                         /*
 469                          * PPC returns ENXIO for HW counters until 2.6.37
 470                          * (behavior changed with commit b0a873e).
 471                          */
 472                         if (errno == EINVAL || errno == ENOSYS ||
 473                             errno == ENOENT || errno == EOPNOTSUPP ||
 474                             errno == ENXIO) {
 475                                 if (verbose > 0)
 476                                         ui__warning("%s event is not supported by the kernel.\n",
 477                                                     perf_evsel__name(counter));
 478                                 counter->supported = false;
 479
 480                                 if ((counter->leader != counter) ||
 481                                     !(counter->leader->nr_members > 1))
 482                                         continue;
 483                         } else if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
 484                                 if (verbose > 0)
 485                                         ui__warning("%s\n", msg);
 486                                 goto try_again;
 487                         } else if (target__has_per_thread(&target) &&
 488                                    evsel_list->threads &&
 489                                    evsel_list->threads->err_thread != -1) {
 490                                 /*
 491                                  * For global --per-thread case, skip current
 492                                  * error thread.
 493                                  */
 494                                 if (!thread_map__remove(evsel_list->threads,
 495                                                         evsel_list->threads->err_thread)) {
 496                                         evsel_list->threads->err_thread = -1;
 497                                         goto try_again;
 498                                 }
 499                         }
 500
 501                         perf_evsel__open_strerror(counter, &target,
 502                                                   errno, msg, sizeof(msg));
 503                         ui__error("%s\n", msg);
 504
 505                         if (child_pid != -1)
 506                                 kill(child_pid, SIGTERM);
 507
 508                         return -1;
 509                 }
 510                 counter->supported = true;
 511
 512                 l = strlen(counter->unit);
 513                 if (l > stat_config.unit_width)
 514                         stat_config.unit_width = l;
 515
 516                 if (perf_evsel__should_store_id(counter) &&
 517                     perf_evsel__store_ids(counter, evsel_list))
 518                         return -1;
 519         }
 520
 521         if (perf_evlist__apply_filters(evsel_list, &counter)) {
 522                 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 523                         counter->filter, perf_evsel__name(counter), errno,
 524                         str_error_r(errno, msg, sizeof(msg)));
 525                 return -1;
 526         }
 527
 528         if (STAT_RECORD) {
 529                 int err, fd = perf_data__fd(&perf_stat.data);
 530
 531                 if (is_pipe) {
 532                         err = perf_header__write_pipe(perf_data__fd(&perf_stat.data));
 533                 } else {
 534                         err = perf_session__write_header(perf_stat.session, evsel_list,
 535                                                          fd, false);
 536                 }
 537
 538                 if (err < 0)
 539                         return err;
 540
 541                 err = perf_stat_synthesize_config(&stat_config, NULL, evsel_list,
 542                                                   process_synthesized_event, is_pipe);
 543                 if (err < 0)
 544                         return err;
 545         }
 546
 547         /*
 548          * Enable counters and exec the command:
 549          */
 550         t0 = rdclock();
 551         clock_gettime(CLOCK_MONOTONIC, &ref_time);
 552
 553         if (forks) {
 554                 perf_evlist__start_workload(evsel_list);
 555                 enable_counters();
 556
 557                 if (interval || timeout) {
 558                         while (!waitpid(child_pid, &status, WNOHANG)) {
 559                                 nanosleep(&ts, NULL);
 560                                 if (timeout)
 561                                         break;
 562                                 process_interval();
 563                                 if (interval_count && !(--times))
 564                                         break;
 565                         }
 566                 }
 567                 if (child_pid != -1)
 568                         wait4(child_pid, &status, 0, &stat_config.ru_data);
 569
 570                 if (workload_exec_errno) {
 571                         const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
 572                         pr_err("Workload failed: %s\n", emsg);
 573                         return -1;
 574                 }
 575
 576                 if (WIFSIGNALED(status))
 577                         psignal(WTERMSIG(status), argv[0]);
 578         } else {
 579                 enable_counters();
 580                 while (!done) {
 581                         nanosleep(&ts, NULL);
 582                         if (!is_target_alive(&target, evsel_list->threads))
 583                                 break;
 584                         if (timeout)
 585                                 break;
 586                         if (interval) {
 587                                 process_interval();
 588                                 if (interval_count && !(--times))
 589                                         break;
 590                         }
 591                 }
 592         }
 593
 594         disable_counters();
 595
 596         t1 = rdclock();
 597
 598         if (stat_config.walltime_run_table)
 599                 stat_config.walltime_run[run_idx] = t1 - t0;
 600
 601         update_stats(&walltime_nsecs_stats, t1 - t0);
 602
 603         /*
 604          * Closing a group leader splits the group, and as we only disable
 605          * group leaders, results in remaining events becoming enabled. To
 606          * avoid arbitrary skew, we must read all counters before closing any
 607          * group leaders.
 608          */
 609         read_counters(&(struct timespec) { .tv_nsec = t1-t0 });
 610         perf_evlist__close(evsel_list);
 611
 612         return WEXITSTATUS(status);
 613 }
 614
 615 static int run_perf_stat(int argc, const char **argv, int run_idx)
 616 {
 617         int ret;
 618
 619         if (pre_cmd) {
 620                 ret = system(pre_cmd);
 621                 if (ret)
 622                         return ret;
 623         }
 624
 625         if (sync_run)
 626                 sync();
 627
 628         ret = __run_perf_stat(argc, argv, run_idx);
 629         if (ret)
 630                 return ret;
 631
 632         if (post_cmd) {
 633                 ret = system(post_cmd);
 634                 if (ret)
 635                         return ret;
 636         }
 637
 638         return ret;
 639 }
 640
 641 static void print_counters(struct timespec *ts, int argc, const char **argv)
 642 {
 643         /* Do not print anything if we record to the pipe. */
 644         if (STAT_RECORD && perf_stat.data.is_pipe)
 645                 return;
 646
 647         perf_evlist__print_counters(evsel_list, &stat_config, &target,
 648                                     ts, argc, argv);
 649 }
 650
 651 static volatile int signr = -1;
 652
 653 static void skip_signal(int signo)
 654 {
 655         if ((child_pid == -1) || stat_config.interval)
 656                 done = 1;
 657
 658         signr = signo;
 659         /*
 660          * render child_pid harmless
 661          * won't send SIGTERM to a random
 662          * process in case of race condition
 663          * and fast PID recycling
 664          */
 665         child_pid = -1;
 666 }
 667
 668 static void sig_atexit(void)
 669 {
 670         sigset_t set, oset;
 671
 672         /*
 673          * avoid race condition with SIGCHLD handler
 674          * in skip_signal() which is modifying child_pid
 675          * goal is to avoid send SIGTERM to a random
 676          * process
 677          */
 678         sigemptyset(&set);
 679         sigaddset(&set, SIGCHLD);
 680         sigprocmask(SIG_BLOCK, &set, &oset);
 681
 682         if (child_pid != -1)
 683                 kill(child_pid, SIGTERM);
 684
 685         sigprocmask(SIG_SETMASK, &oset, NULL);
 686
 687         if (signr == -1)
 688                 return;
 689
 690         signal(signr, SIG_DFL);
 691         kill(getpid(), signr);
 692 }
 693
 694 static int stat__set_big_num(const struct option *opt __maybe_unused,
 695                              const char *s __maybe_unused, int unset)
 696 {
 697         big_num_opt = unset ? 0 : 1;
 698         return 0;
 699 }
 700
 701 static int enable_metric_only(const struct option *opt __maybe_unused,
 702                               const char *s __maybe_unused, int unset)
 703 {
 704         force_metric_only = true;
 705         stat_config.metric_only = !unset;
 706         return 0;
 707 }
 708
 709 static int parse_metric_groups(const struct option *opt,
 710                                const char *str,
 711                                int unset __maybe_unused)
 712 {
 713         return metricgroup__parse_groups(opt, str, &stat_config.metric_events);
 714 }
 715
 716 static struct option stat_options[] = {
 717         OPT_BOOLEAN('T', "transaction", &transaction_run,
 718                     "hardware transaction statistics"),
 719         OPT_CALLBACK('e', "event", &evsel_list, "event",
 720                      "event selector. use 'perf list' to list available events",
 721                      parse_events_option),
 722         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
 723                      "event filter", parse_filter),
 724         OPT_BOOLEAN('i', "no-inherit", &stat_config.no_inherit,
 725                     "child tasks do not inherit counters"),
 726         OPT_STRING('p', "pid", &target.pid, "pid",
 727                    "stat events on existing process id"),
 728         OPT_STRING('t', "tid", &target.tid, "tid",
 729                    "stat events on existing thread id"),
 730         OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
 731                     "system-wide collection from all CPUs"),
 732         OPT_BOOLEAN('g', "group", &group,
 733                     "put the counters into a counter group"),
 734         OPT_BOOLEAN(0, "scale", &stat_config.scale,
 735                     "Use --no-scale to disable counter scaling for multiplexing"),
 736         OPT_INCR('v', "verbose", &verbose,
 737                     "be more verbose (show counter open errors, etc)"),
 738         OPT_INTEGER('r', "repeat", &stat_config.run_count,
 739                     "repeat command and print average + stddev (max: 100, forever: 0)"),
 740         OPT_BOOLEAN(0, "table", &stat_config.walltime_run_table,
 741                     "display details about each run (only with -r option)"),
 742         OPT_BOOLEAN('n', "null", &stat_config.null_run,
 743                     "null run - dont start any counters"),
 744         OPT_INCR('d', "detailed", &detailed_run,
 745                     "detailed run - start a lot of events"),
 746         OPT_BOOLEAN('S', "sync", &sync_run,
 747                     "call sync() before starting a run"),
 748         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
 749                            "print large numbers with thousands\' separators",
 750                            stat__set_big_num),
 751         OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
 752                     "list of cpus to monitor in system-wide"),
 753         OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
 754                     "disable CPU count aggregation", AGGR_NONE),
 755         OPT_BOOLEAN(0, "no-merge", &stat_config.no_merge, "Do not merge identical named events"),
 756         OPT_STRING('x', "field-separator", &stat_config.csv_sep, "separator",
 757                    "print counts with custom separator"),
 758         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
 759                      "monitor event in cgroup name only", parse_cgroups),
 760         OPT_STRING('o', "output", &output_name, "file", "output file name"),
 761         OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
 762         OPT_INTEGER(0, "log-fd", &output_fd,
 763                     "log output to fd, instead of stderr"),
 764         OPT_STRING(0, "pre", &pre_cmd, "command",
 765                         "command to run prior to the measured command"),
 766         OPT_STRING(0, "post", &post_cmd, "command",
 767                         "command to run after to the measured command"),
 768         OPT_UINTEGER('I', "interval-print", &stat_config.interval,
 769                     "print counts at regular interval in ms "
 770                     "(overhead is possible for values <= 100ms)"),
 771         OPT_INTEGER(0, "interval-count", &stat_config.times,
 772                     "print counts for fixed number of times"),
 773         OPT_BOOLEAN(0, "interval-clear", &stat_config.interval_clear,
 774                     "clear screen in between new interval"),
 775         OPT_UINTEGER(0, "timeout", &stat_config.timeout,
 776                     "stop workload and print counts after a timeout period in ms (>= 10ms)"),
 777         OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
 778                      "aggregate counts per processor socket", AGGR_SOCKET),
 779         OPT_SET_UINT(0, "per-die", &stat_config.aggr_mode,
 780                      "aggregate counts per processor die", AGGR_DIE),
 781         OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode,
 782                      "aggregate counts per physical processor core", AGGR_CORE),
 783         OPT_SET_UINT(0, "per-thread", &stat_config.aggr_mode,
 784                      "aggregate counts per thread", AGGR_THREAD),
 785         OPT_UINTEGER('D', "delay", &stat_config.initial_delay,
 786                      "ms to wait before starting measurement after program start"),
 787         OPT_CALLBACK_NOOPT(0, "metric-only", &stat_config.metric_only, NULL,
 788                         "Only print computed metrics. No raw values", enable_metric_only),
 789         OPT_BOOLEAN(0, "topdown", &topdown_run,
 790                         "measure topdown level 1 statistics"),
 791         OPT_BOOLEAN(0, "smi-cost", &smi_cost,
 792                         "measure SMI cost"),
 793         OPT_CALLBACK('M', "metrics", &evsel_list, "metric/metric group list",
 794                      "monitor specified metrics or metric groups (separated by ,)",
 795                      parse_metric_groups),
 796         OPT_END()
 797 };
 798
 799 static int perf_stat__get_socket(struct perf_stat_config *config __maybe_unused,
 800                                  struct cpu_map *map, int cpu)
 801 {
 802         return cpu_map__get_socket(map, cpu, NULL);
 803 }
 804
 805 static int perf_stat__get_die(struct perf_stat_config *config __maybe_unused,
 806                               struct cpu_map *map, int cpu)
 807 {
 808         return cpu_map__get_die(map, cpu, NULL);
 809 }
 810
 811 static int perf_stat__get_core(struct perf_stat_config *config __maybe_unused,
 812                                struct cpu_map *map, int cpu)
 813 {
 814         return cpu_map__get_core(map, cpu, NULL);
 815 }
 816
 817 static int cpu_map__get_max(struct cpu_map *map)
 818 {
 819         int i, max = -1;
 820
 821         for (i = 0; i < map->nr; i++) {
 822                 if (map->map[i] > max)
 823                         max = map->map[i];
 824         }
 825
 826         return max;
 827 }
 828
 829 static int perf_stat__get_aggr(struct perf_stat_config *config,
 830                                aggr_get_id_t get_id, struct cpu_map *map, int idx)
 831 {
 832         int cpu;
 833
 834         if (idx >= map->nr)
 835                 return -1;
 836
 837         cpu = map->map[idx];
 838
 839         if (config->cpus_aggr_map->map[cpu] == -1)
 840                 config->cpus_aggr_map->map[cpu] = get_id(config, map, idx);
 841
 842         return config->cpus_aggr_map->map[cpu];
 843 }
 844
 845 static int perf_stat__get_socket_cached(struct perf_stat_config *config,
 846                                         struct cpu_map *map, int idx)
 847 {
 848         return perf_stat__get_aggr(config, perf_stat__get_socket, map, idx);
 849 }
 850
 851 static int perf_stat__get_die_cached(struct perf_stat_config *config,
 852                                         struct cpu_map *map, int idx)
 853 {
 854         return perf_stat__get_aggr(config, perf_stat__get_die, map, idx);
 855 }
 856
 857 static int perf_stat__get_core_cached(struct perf_stat_config *config,
 858                                       struct cpu_map *map, int idx)
 859 {
 860         return perf_stat__get_aggr(config, perf_stat__get_core, map, idx);
 861 }
 862
 863 static bool term_percore_set(void)
 864 {
 865         struct perf_evsel *counter;
 866
 867         evlist__for_each_entry(evsel_list, counter) {
 868                 if (counter->percore)
 869                         return true;
 870         }
 871
 872         return false;
 873 }
 874
 875 static int perf_stat_init_aggr_mode(void)
 876 {
 877         int nr;
 878
 879         switch (stat_config.aggr_mode) {
 880         case AGGR_SOCKET:
 881                 if (cpu_map__build_socket_map(evsel_list->cpus, &stat_config.aggr_map)) {
 882                         perror("cannot build socket map");
 883                         return -1;
 884                 }
 885                 stat_config.aggr_get_id = perf_stat__get_socket_cached;
 886                 break;
 887         case AGGR_DIE:
 888                 if (cpu_map__build_die_map(evsel_list->cpus, &stat_config.aggr_map)) {
 889                         perror("cannot build die map");
 890                         return -1;
 891                 }
 892                 stat_config.aggr_get_id = perf_stat__get_die_cached;
 893                 break;
 894         case AGGR_CORE:
 895                 if (cpu_map__build_core_map(evsel_list->cpus, &stat_config.aggr_map)) {
 896                         perror("cannot build core map");
 897                         return -1;
 898                 }
 899                 stat_config.aggr_get_id = perf_stat__get_core_cached;
 900                 break;
 901         case AGGR_NONE:
 902                 if (term_percore_set()) {
 903                         if (cpu_map__build_core_map(evsel_list->cpus,
 904                                                     &stat_config.aggr_map)) {
 905                                 perror("cannot build core map");
 906                                 return -1;
 907                         }
 908                         stat_config.aggr_get_id = perf_stat__get_core_cached;
 909                 }
 910                 break;
 911         case AGGR_GLOBAL:
 912         case AGGR_THREAD:
 913         case AGGR_UNSET:
 914         default:
 915                 break;
 916         }
 917
 918         /*
 919          * The evsel_list->cpus is the base we operate on,
 920          * taking the highest cpu number to be the size of
 921          * the aggregation translate cpumap.
 922          */
 923         nr = cpu_map__get_max(evsel_list->cpus);
 924         stat_config.cpus_aggr_map = cpu_map__empty_new(nr + 1);
 925         return stat_config.cpus_aggr_map ? 0 : -ENOMEM;
 926 }
 927
 928 static void perf_stat__exit_aggr_mode(void)
 929 {
 930         cpu_map__put(stat_config.aggr_map);
 931         cpu_map__put(stat_config.cpus_aggr_map);
 932         stat_config.aggr_map = NULL;
 933         stat_config.cpus_aggr_map = NULL;
 934 }
 935
 936 static inline int perf_env__get_cpu(struct perf_env *env, struct cpu_map *map, int idx)
 937 {
 938         int cpu;
 939
 940         if (idx > map->nr)
 941                 return -1;
 942
 943         cpu = map->map[idx];
 944
 945         if (cpu >= env->nr_cpus_avail)
 946                 return -1;
 947
 948         return cpu;
 949 }
 950
 951 static int perf_env__get_socket(struct cpu_map *map, int idx, void *data)
 952 {
 953         struct perf_env *env = data;
 954         int cpu = perf_env__get_cpu(env, map, idx);
 955
 956         return cpu == -1 ? -1 : env->cpu[cpu].socket_id;
 957 }
 958
 959 static int perf_env__get_die(struct cpu_map *map, int idx, void *data)
 960 {
 961         struct perf_env *env = data;
 962         int die_id = -1, cpu = perf_env__get_cpu(env, map, idx);
 963
 964         if (cpu != -1) {
 965                 /*
 966                  * Encode socket in bit range 15:8
 967                  * die_id is relative to socket,
 968                  * we need a global id. So we combine
 969                  * socket + die id
 970                  */
 971                 if (WARN_ONCE(env->cpu[cpu].socket_id >> 8, "The socket id number is too big.\n"))
 972                         return -1;
 973
 974                 if (WARN_ONCE(env->cpu[cpu].die_id >> 8, "The die id number is too big.\n"))
 975                         return -1;
 976
 977                 die_id = (env->cpu[cpu].socket_id << 8) | (env->cpu[cpu].die_id & 0xff);
 978         }
 979
 980         return die_id;
 981 }
 982
 983 static int perf_env__get_core(struct cpu_map *map, int idx, void *data)
 984 {
 985         struct perf_env *env = data;
 986         int core = -1, cpu = perf_env__get_cpu(env, map, idx);
 987
 988         if (cpu != -1) {
 989                 /*
 990                  * Encode socket in bit range 31:24
 991                  * encode die id in bit range 23:16
 992                  * core_id is relative to socket and die,
 993                  * we need a global id. So we combine
 994                  * socket + die id + core id
 995                  */
 996                 if (WARN_ONCE(env->cpu[cpu].socket_id >> 8, "The socket id number is too big.\n"))
 997                         return -1;
 998
 999                 if (WARN_ONCE(env->cpu[cpu].die_id >> 8, "The die id number is too big.\n"))
1000                         return -1;
1001
1002                 if (WARN_ONCE(env->cpu[cpu].core_id >> 16, "The core id number is too big.\n"))
1003                         return -1;
1004
1005                 core = (env->cpu[cpu].socket_id << 24) |
1006                        (env->cpu[cpu].die_id << 16) |
1007                        (env->cpu[cpu].core_id & 0xffff);
1008         }
1009
1010         return core;
1011 }
1012
1013 static int perf_env__build_socket_map(struct perf_env *env, struct cpu_map *cpus,
1014                                       struct cpu_map **sockp)
1015 {
1016         return cpu_map__build_map(cpus, sockp, perf_env__get_socket, env);
1017 }
1018
1019 static int perf_env__build_die_map(struct perf_env *env, struct cpu_map *cpus,
1020                                    struct cpu_map **diep)
1021 {
1022         return cpu_map__build_map(cpus, diep, perf_env__get_die, env);
1023 }
1024
1025 static int perf_env__build_core_map(struct perf_env *env, struct cpu_map *cpus,
1026                                     struct cpu_map **corep)
1027 {
1028         return cpu_map__build_map(cpus, corep, perf_env__get_core, env);
1029 }
1030
1031 static int perf_stat__get_socket_file(struct perf_stat_config *config __maybe_unused,
1032                                       struct cpu_map *map, int idx)
1033 {
1034         return perf_env__get_socket(map, idx, &perf_stat.session->header.env);
1035 }
1036 static int perf_stat__get_die_file(struct perf_stat_config *config __maybe_unused,
1037                                    struct cpu_map *map, int idx)
1038 {
1039         return perf_env__get_die(map, idx, &perf_stat.session->header.env);
1040 }
1041
1042 static int perf_stat__get_core_file(struct perf_stat_config *config __maybe_unused,
1043                                     struct cpu_map *map, int idx)
1044 {
1045         return perf_env__get_core(map, idx, &perf_stat.session->header.env);
1046 }
1047
1048 static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
1049 {
1050         struct perf_env *env = &st->session->header.env;
1051
1052         switch (stat_config.aggr_mode) {
1053         case AGGR_SOCKET:
1054                 if (perf_env__build_socket_map(env, evsel_list->cpus, &stat_config.aggr_map)) {
1055                         perror("cannot build socket map");
1056                         return -1;
1057                 }
1058                 stat_config.aggr_get_id = perf_stat__get_socket_file;
1059                 break;
1060         case AGGR_DIE:
1061                 if (perf_env__build_die_map(env, evsel_list->cpus, &stat_config.aggr_map)) {
1062                         perror("cannot build die map");
1063                         return -1;
1064                 }
1065                 stat_config.aggr_get_id = perf_stat__get_die_file;
1066                 break;
1067         case AGGR_CORE:
1068                 if (perf_env__build_core_map(env, evsel_list->cpus, &stat_config.aggr_map)) {
1069                         perror("cannot build core map");
1070                         return -1;
1071                 }
1072                 stat_config.aggr_get_id = perf_stat__get_core_file;
1073                 break;
1074         case AGGR_NONE:
1075         case AGGR_GLOBAL:
1076         case AGGR_THREAD:
1077         case AGGR_UNSET:
1078         default:
1079                 break;
1080         }
1081
1082         return 0;
1083 }
1084
1085 static int topdown_filter_events(const char **attr, char **str, bool use_group)
1086 {
1087         int off = 0;
1088         int i;
1089         int len = 0;
1090         char *s;
1091
1092         for (i = 0; attr[i]; i++) {
1093                 if (pmu_have_event("cpu", attr[i])) {
1094                         len += strlen(attr[i]) + 1;
1095                         attr[i - off] = attr[i];
1096                 } else
1097                         off++;
1098         }
1099         attr[i - off] = NULL;
1100
1101         *str = malloc(len + 1 + 2);
1102         if (!*str)
1103                 return -1;
1104         s = *str;
1105         if (i - off == 0) {
1106                 *s = 0;
1107                 return 0;
1108         }
1109         if (use_group)
1110                 *s++ = '{';
1111         for (i = 0; attr[i]; i++) {
1112                 strcpy(s, attr[i]);
1113                 s += strlen(s);
1114                 *s++ = ',';
1115         }
1116         if (use_group) {
1117                 s[-1] = '}';
1118                 *s = 0;
1119         } else
1120                 s[-1] = 0;
1121         return 0;
1122 }
1123
1124 __weak bool arch_topdown_check_group(bool *warn)
1125 {
1126         *warn = false;
1127         return false;
1128 }
1129
1130 __weak void arch_topdown_group_warn(void)
1131 {
1132 }
1133
1134 /*
1135  * Add default attributes, if there were no attributes specified or
1136  * if -d/--detailed, -d -d or -d -d -d is used:
1137  */
1138 static int add_default_attributes(void)
1139 {
1140         int err;
1141         struct perf_event_attr default_attrs0[] = {
1142
1143   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
1144   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
1145   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
1146   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
1147
1148   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
1149 };
1150         struct perf_event_attr frontend_attrs[] = {
1151   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
1152 };
1153         struct perf_event_attr backend_attrs[] = {
1154   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
1155 };
1156         struct perf_event_attr default_attrs1[] = {
1157   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
1158   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
1159   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
1160
1161 };
1162
1163 /*
1164  * Detailed stats (-d), covering the L1 and last level data caches:
1165  */
1166         struct perf_event_attr detailed_attrs[] = {
1167
1168   { .type = PERF_TYPE_HW_CACHE,
1169     .config =
1170          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1171         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1172         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1173
1174   { .type = PERF_TYPE_HW_CACHE,
1175     .config =
1176          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1177         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1178         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1179
1180   { .type = PERF_TYPE_HW_CACHE,
1181     .config =
1182          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1183         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1184         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1185
1186   { .type = PERF_TYPE_HW_CACHE,
1187     .config =
1188          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1189         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1190         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1191 };
1192
1193 /*
1194  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
1195  */
1196         struct perf_event_attr very_detailed_attrs[] = {
1197
1198   { .type = PERF_TYPE_HW_CACHE,
1199     .config =
1200          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1201         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1202         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1203
1204   { .type = PERF_TYPE_HW_CACHE,
1205     .config =
1206          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1207         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1208         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1209
1210   { .type = PERF_TYPE_HW_CACHE,
1211     .config =
1212          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1213         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1214         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1215
1216   { .type = PERF_TYPE_HW_CACHE,
1217     .config =
1218          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1219         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1220         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1221
1222   { .type = PERF_TYPE_HW_CACHE,
1223     .config =
1224          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1225         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1226         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1227
1228   { .type = PERF_TYPE_HW_CACHE,
1229     .config =
1230          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1231         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1232         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1233
1234 };
1235
1236 /*
1237  * Very, very detailed stats (-d -d -d), adding prefetch events:
1238  */
1239         struct perf_event_attr very_very_detailed_attrs[] = {
1240
1241   { .type = PERF_TYPE_HW_CACHE,
1242     .config =
1243          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1244         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1245         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1246
1247   { .type = PERF_TYPE_HW_CACHE,
1248     .config =
1249          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1250         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1251         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1252 };
1253         struct parse_events_error errinfo;
1254
1255         /* Set attrs if no event is selected and !null_run: */
1256         if (stat_config.null_run)
1257                 return 0;
1258
1259         if (transaction_run) {
1260                 /* Handle -T as -M transaction. Once platform specific metrics
1261                  * support has been added to the json files, all archictures
1262                  * will use this approach. To determine transaction support
1263                  * on an architecture test for such a metric name.
1264                  */
1265                 if (metricgroup__has_metric("transaction")) {
1266                         struct option opt = { .value = &evsel_list };
1267
1268                         return metricgroup__parse_groups(&opt, "transaction",
1269                                                          &stat_config.metric_events);
1270                 }
1271
1272                 if (pmu_have_event("cpu", "cycles-ct") &&
1273                     pmu_have_event("cpu", "el-start"))
1274                         err = parse_events(evsel_list, transaction_attrs,
1275                                            &errinfo);
1276                 else
1277                         err = parse_events(evsel_list,
1278                                            transaction_limited_attrs,
1279                                            &errinfo);
1280                 if (err) {
1281                         fprintf(stderr, "Cannot set up transaction events\n");
1282                         parse_events_print_error(&errinfo, transaction_attrs);
1283                         return -1;
1284                 }
1285                 return 0;
1286         }
1287
1288         if (smi_cost) {
1289                 int smi;
1290
1291                 if (sysfs__read_int(FREEZE_ON_SMI_PATH, &smi) < 0) {
1292                         fprintf(stderr, "freeze_on_smi is not supported.\n");
1293                         return -1;
1294                 }
1295
1296                 if (!smi) {
1297                         if (sysfs__write_int(FREEZE_ON_SMI_PATH, 1) < 0) {
1298                                 fprintf(stderr, "Failed to set freeze_on_smi.\n");
1299                                 return -1;
1300                         }
1301                         smi_reset = true;
1302                 }
1303
1304                 if (pmu_have_event("msr", "aperf") &&
1305                     pmu_have_event("msr", "smi")) {
1306                         if (!force_metric_only)
1307                                 stat_config.metric_only = true;
1308                         err = parse_events(evsel_list, smi_cost_attrs, &errinfo);
1309                 } else {
1310                         fprintf(stderr, "To measure SMI cost, it needs "
1311                                 "msr/aperf/, msr/smi/ and cpu/cycles/ support\n");
1312                         parse_events_print_error(&errinfo, smi_cost_attrs);
1313                         return -1;
1314                 }
1315                 if (err) {
1316                         fprintf(stderr, "Cannot set up SMI cost events\n");
1317                         return -1;
1318                 }
1319                 return 0;
1320         }
1321
1322         if (topdown_run) {
1323                 char *str = NULL;
1324                 bool warn = false;
1325
1326                 if (stat_config.aggr_mode != AGGR_GLOBAL &&
1327                     stat_config.aggr_mode != AGGR_CORE) {
1328                         pr_err("top down event configuration requires --per-core mode\n");
1329                         return -1;
1330                 }
1331                 stat_config.aggr_mode = AGGR_CORE;
1332                 if (nr_cgroups || !target__has_cpu(&target)) {
1333                         pr_err("top down event configuration requires system-wide mode (-a)\n");
1334                         return -1;
1335                 }
1336
1337                 if (!force_metric_only)
1338                         stat_config.metric_only = true;
1339                 if (topdown_filter_events(topdown_attrs, &str,
1340                                 arch_topdown_check_group(&warn)) < 0) {
1341                         pr_err("Out of memory\n");
1342                         return -1;
1343                 }
1344                 if (topdown_attrs[0] && str) {
1345                         if (warn)
1346                                 arch_topdown_group_warn();
1347                         err = parse_events(evsel_list, str, &errinfo);
1348                         if (err) {
1349                                 fprintf(stderr,
1350                                         "Cannot set up top down events %s: %d\n",
1351                                         str, err);
1352                                 parse_events_print_error(&errinfo, str);
1353                                 free(str);
1354                                 return -1;
1355                         }
1356                 } else {
1357                         fprintf(stderr, "System does not support topdown\n");
1358                         return -1;
1359                 }
1360                 free(str);
1361         }
1362
1363         if (!evsel_list->nr_entries) {
1364                 if (target__has_cpu(&target))
1365                         default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
1366
1367                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
1368                         return -1;
1369                 if (pmu_have_event("cpu", "stalled-cycles-frontend")) {
1370                         if (perf_evlist__add_default_attrs(evsel_list,
1371                                                 frontend_attrs) < 0)
1372                                 return -1;
1373                 }
1374                 if (pmu_have_event("cpu", "stalled-cycles-backend")) {
1375                         if (perf_evlist__add_default_attrs(evsel_list,
1376                                                 backend_attrs) < 0)
1377                                 return -1;
1378                 }
1379                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs1) < 0)
1380                         return -1;
1381         }
1382
1383         /* Detailed events get appended to the event list: */
1384
1385         if (detailed_run <  1)
1386                 return 0;
1387
1388         /* Append detailed run extra attributes: */
1389         if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
1390                 return -1;
1391
1392         if (detailed_run < 2)
1393                 return 0;
1394
1395         /* Append very detailed run extra attributes: */
1396         if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
1397                 return -1;
1398
1399         if (detailed_run < 3)
1400                 return 0;
1401
1402         /* Append very, very detailed run extra attributes: */
1403         return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
1404 }
1405
1406 static const char * const stat_record_usage[] = {
1407         "perf stat record [<options>]",
1408         NULL,
1409 };
1410
1411 static void init_features(struct perf_session *session)
1412 {
1413         int feat;
1414
1415         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1416                 perf_header__set_feat(&session->header, feat);
1417
1418         perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1419         perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1420         perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1421         perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1422         perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1423 }
1424
1425 static int __cmd_record(int argc, const char **argv)
1426 {
1427         struct perf_session *session;
1428         struct perf_data *data = &perf_stat.data;
1429
1430         argc = parse_options(argc, argv, stat_options, stat_record_usage,
1431                              PARSE_OPT_STOP_AT_NON_OPTION);
1432
1433         if (output_name)
1434                 data->path = output_name;
1435
1436         if (stat_config.run_count != 1 || forever) {
1437                 pr_err("Cannot use -r option with perf stat record.\n");
1438                 return -1;
1439         }
1440
1441         session = perf_session__new(data, false, NULL);
1442         if (session == NULL) {
1443                 pr_err("Perf session creation failed.\n");
1444                 return -1;
1445         }
1446
1447         init_features(session);
1448
1449         session->evlist   = evsel_list;
1450         perf_stat.session = session;
1451         perf_stat.record  = true;
1452         return argc;
1453 }
1454
1455 static int process_stat_round_event(struct perf_session *session,
1456                                     union perf_event *event)
1457 {
1458         struct stat_round_event *stat_round = &event->stat_round;
1459         struct perf_evsel *counter;
1460         struct timespec tsh, *ts = NULL;
1461         const char **argv = session->header.env.cmdline_argv;
1462         int argc = session->header.env.nr_cmdline;
1463
1464         evlist__for_each_entry(evsel_list, counter)
1465                 perf_stat_process_counter(&stat_config, counter);
1466
1467         if (stat_round->type == PERF_STAT_ROUND_TYPE__FINAL)
1468                 update_stats(&walltime_nsecs_stats, stat_round->time);
1469
1470         if (stat_config.interval && stat_round->time) {
1471                 tsh.tv_sec  = stat_round->time / NSEC_PER_SEC;
1472                 tsh.tv_nsec = stat_round->time % NSEC_PER_SEC;
1473                 ts = &tsh;
1474         }
1475
1476         print_counters(ts, argc, argv);
1477         return 0;
1478 }
1479
1480 static
1481 int process_stat_config_event(struct perf_session *session,
1482                               union perf_event *event)
1483 {
1484         struct perf_tool *tool = session->tool;
1485         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1486
1487         perf_event__read_stat_config(&stat_config, &event->stat_config);
1488
1489         if (cpu_map__empty(st->cpus)) {
1490                 if (st->aggr_mode != AGGR_UNSET)
1491                         pr_warning("warning: processing task data, aggregation mode not set\n");
1492                 return 0;
1493         }
1494
1495         if (st->aggr_mode != AGGR_UNSET)
1496                 stat_config.aggr_mode = st->aggr_mode;
1497
1498         if (perf_stat.data.is_pipe)
1499                 perf_stat_init_aggr_mode();
1500         else
1501                 perf_stat_init_aggr_mode_file(st);
1502
1503         return 0;
1504 }
1505
1506 static int set_maps(struct perf_stat *st)
1507 {
1508         if (!st->cpus || !st->threads)
1509                 return 0;
1510
1511         if (WARN_ONCE(st->maps_allocated, "stats double allocation\n"))
1512                 return -EINVAL;
1513
1514         perf_evlist__set_maps(evsel_list, st->cpus, st->threads);
1515
1516         if (perf_evlist__alloc_stats(evsel_list, true))
1517                 return -ENOMEM;
1518
1519         st->maps_allocated = true;
1520         return 0;
1521 }
1522
1523 static
1524 int process_thread_map_event(struct perf_session *session,
1525                              union perf_event *event)
1526 {
1527         struct perf_tool *tool = session->tool;
1528         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1529
1530         if (st->threads) {
1531                 pr_warning("Extra thread map event, ignoring.\n");
1532                 return 0;
1533         }
1534
1535         st->threads = thread_map__new_event(&event->thread_map);
1536         if (!st->threads)
1537                 return -ENOMEM;
1538
1539         return set_maps(st);
1540 }
1541
1542 static
1543 int process_cpu_map_event(struct perf_session *session,
1544                           union perf_event *event)
1545 {
1546         struct perf_tool *tool = session->tool;
1547         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1548         struct cpu_map *cpus;
1549
1550         if (st->cpus) {
1551                 pr_warning("Extra cpu map event, ignoring.\n");
1552                 return 0;
1553         }
1554
1555         cpus = cpu_map__new_data(&event->cpu_map.data);
1556         if (!cpus)
1557                 return -ENOMEM;
1558
1559         st->cpus = cpus;
1560         return set_maps(st);
1561 }
1562
1563 static int runtime_stat_new(struct perf_stat_config *config, int nthreads)
1564 {
1565         int i;
1566
1567         config->stats = calloc(nthreads, sizeof(struct runtime_stat));
1568         if (!config->stats)
1569                 return -1;
1570
1571         config->stats_num = nthreads;
1572
1573         for (i = 0; i < nthreads; i++)
1574                 runtime_stat__init(&config->stats[i]);
1575
1576         return 0;
1577 }
1578
1579 static void runtime_stat_delete(struct perf_stat_config *config)
1580 {
1581         int i;
1582
1583         if (!config->stats)
1584                 return;
1585
1586         for (i = 0; i < config->stats_num; i++)
1587                 runtime_stat__exit(&config->stats[i]);
1588
1589         zfree(&config->stats);
1590 }
1591
1592 static const char * const stat_report_usage[] = {
1593         "perf stat report [<options>]",
1594         NULL,
1595 };
1596
1597 static struct perf_stat perf_stat = {
1598         .tool = {
1599                 .attr           = perf_event__process_attr,
1600                 .event_update   = perf_event__process_event_update,
1601                 .thread_map     = process_thread_map_event,
1602                 .cpu_map        = process_cpu_map_event,
1603                 .stat_config    = process_stat_config_event,
1604                 .stat           = perf_event__process_stat_event,
1605                 .stat_round     = process_stat_round_event,
1606         },
1607         .aggr_mode = AGGR_UNSET,
1608 };
1609
1610 static int __cmd_report(int argc, const char **argv)
1611 {
1612         struct perf_session *session;
1613         const struct option options[] = {
1614         OPT_STRING('i', "input", &input_name, "file", "input file name"),
1615         OPT_SET_UINT(0, "per-socket", &perf_stat.aggr_mode,
1616                      "aggregate counts per processor socket", AGGR_SOCKET),
1617         OPT_SET_UINT(0, "per-die", &perf_stat.aggr_mode,
1618                      "aggregate counts per processor die", AGGR_DIE),
1619         OPT_SET_UINT(0, "per-core", &perf_stat.aggr_mode,
1620                      "aggregate counts per physical processor core", AGGR_CORE),
1621         OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
1622                      "disable CPU count aggregation", AGGR_NONE),
1623         OPT_END()
1624         };
1625         struct stat st;
1626         int ret;
1627
1628         argc = parse_options(argc, argv, options, stat_report_usage, 0);
1629
1630         if (!input_name || !strlen(input_name)) {
1631                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
1632                         input_name = "-";
1633                 else
1634                         input_name = "perf.data";
1635         }
1636
1637         perf_stat.data.path = input_name;
1638         perf_stat.data.mode = PERF_DATA_MODE_READ;
1639
1640         session = perf_session__new(&perf_stat.data, false, &perf_stat.tool);
1641         if (session == NULL)
1642                 return -1;
1643
1644         perf_stat.session  = session;
1645         stat_config.output = stderr;
1646         evsel_list         = session->evlist;
1647
1648         ret = perf_session__process_events(session);
1649         if (ret)
1650                 return ret;
1651
1652         perf_session__delete(session);
1653         return 0;
1654 }
1655
1656 static void setup_system_wide(int forks)
1657 {
1658         /*
1659          * Make system wide (-a) the default target if
1660          * no target was specified and one of following
1661          * conditions is met:
1662          *
1663          *   - there's no workload specified
1664          *   - there is workload specified but all requested
1665          *     events are system wide events
1666          */
1667         if (!target__none(&target))
1668                 return;
1669
1670         if (!forks)
1671                 target.system_wide = true;
1672         else {
1673                 struct perf_evsel *counter;
1674
1675                 evlist__for_each_entry(evsel_list, counter) {
1676                         if (!counter->system_wide)
1677                                 return;
1678                 }
1679
1680                 if (evsel_list->nr_entries)
1681                         target.system_wide = true;
1682         }
1683 }
1684
1685 int cmd_stat(int argc, const char **argv)
1686 {
1687         const char * const stat_usage[] = {
1688                 "perf stat [<options>] [<command>]",
1689                 NULL
1690         };
1691         int status = -EINVAL, run_idx;
1692         const char *mode;
1693         FILE *output = stderr;
1694         unsigned int interval, timeout;
1695         const char * const stat_subcommands[] = { "record", "report" };
1696
1697         setlocale(LC_ALL, "");
1698
1699         evsel_list = perf_evlist__new();
1700         if (evsel_list == NULL)
1701                 return -ENOMEM;
1702
1703         parse_events__shrink_config_terms();
1704
1705         /* String-parsing callback-based options would segfault when negated */
1706         set_option_flag(stat_options, 'e', "event", PARSE_OPT_NONEG);
1707         set_option_flag(stat_options, 'M', "metrics", PARSE_OPT_NONEG);
1708         set_option_flag(stat_options, 'G', "cgroup", PARSE_OPT_NONEG);
1709
1710         argc = parse_options_subcommand(argc, argv, stat_options, stat_subcommands,
1711                                         (const char **) stat_usage,
1712                                         PARSE_OPT_STOP_AT_NON_OPTION);
1713         perf_stat__collect_metric_expr(evsel_list);
1714         perf_stat__init_shadow_stats();
1715
1716         if (stat_config.csv_sep) {
1717                 stat_config.csv_output = true;
1718                 if (!strcmp(stat_config.csv_sep, "\\t"))
1719                         stat_config.csv_sep = "\t";
1720         } else
1721                 stat_config.csv_sep = DEFAULT_SEPARATOR;
1722
1723         if (argc && !strncmp(argv[0], "rec", 3)) {
1724                 argc = __cmd_record(argc, argv);
1725                 if (argc < 0)
1726                         return -1;
1727         } else if (argc && !strncmp(argv[0], "rep", 3))
1728                 return __cmd_report(argc, argv);
1729
1730         interval = stat_config.interval;
1731         timeout = stat_config.timeout;
1732
1733         /*
1734          * For record command the -o is already taken care of.
1735          */
1736         if (!STAT_RECORD && output_name && strcmp(output_name, "-"))
1737                 output = NULL;
1738
1739         if (output_name && output_fd) {
1740                 fprintf(stderr, "cannot use both --output and --log-fd\n");
1741                 parse_options_usage(stat_usage, stat_options, "o", 1);
1742                 parse_options_usage(NULL, stat_options, "log-fd", 0);
1743                 goto out;
1744         }
1745
1746         if (stat_config.metric_only && stat_config.aggr_mode == AGGR_THREAD) {
1747                 fprintf(stderr, "--metric-only is not supported with --per-thread\n");
1748                 goto out;
1749         }
1750
1751         if (stat_config.metric_only && stat_config.run_count > 1) {
1752                 fprintf(stderr, "--metric-only is not supported with -r\n");
1753                 goto out;
1754         }
1755
1756         if (stat_config.walltime_run_table && stat_config.run_count <= 1) {
1757                 fprintf(stderr, "--table is only supported with -r\n");
1758                 parse_options_usage(stat_usage, stat_options, "r", 1);
1759                 parse_options_usage(NULL, stat_options, "table", 0);
1760                 goto out;
1761         }
1762
1763         if (output_fd < 0) {
1764                 fprintf(stderr, "argument to --log-fd must be a > 0\n");
1765                 parse_options_usage(stat_usage, stat_options, "log-fd", 0);
1766                 goto out;
1767         }
1768
1769         if (!output) {
1770                 struct timespec tm;
1771                 mode = append_file ? "a" : "w";
1772
1773                 output = fopen(output_name, mode);
1774                 if (!output) {
1775                         perror("failed to create output file");
1776                         return -1;
1777                 }
1778                 clock_gettime(CLOCK_REALTIME, &tm);
1779                 fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
1780         } else if (output_fd > 0) {
1781                 mode = append_file ? "a" : "w";
1782                 output = fdopen(output_fd, mode);
1783                 if (!output) {
1784                         perror("Failed opening logfd");
1785                         return -errno;
1786                 }
1787         }
1788
1789         stat_config.output = output;
1790
1791         /*
1792          * let the spreadsheet do the pretty-printing
1793          */
1794         if (stat_config.csv_output) {
1795                 /* User explicitly passed -B? */
1796                 if (big_num_opt == 1) {
1797                         fprintf(stderr, "-B option not supported with -x\n");
1798                         parse_options_usage(stat_usage, stat_options, "B", 1);
1799                         parse_options_usage(NULL, stat_options, "x", 1);
1800                         goto out;
1801                 } else /* Nope, so disable big number formatting */
1802                         stat_config.big_num = false;
1803         } else if (big_num_opt == 0) /* User passed --no-big-num */
1804                 stat_config.big_num = false;
1805
1806         setup_system_wide(argc);
1807
1808         /*
1809          * Display user/system times only for single
1810          * run and when there's specified tracee.
1811          */
1812         if ((stat_config.run_count == 1) && target__none(&target))
1813                 stat_config.ru_display = true;
1814
1815         if (stat_config.run_count < 0) {
1816                 pr_err("Run count must be a positive number\n");
1817                 parse_options_usage(stat_usage, stat_options, "r", 1);
1818                 goto out;
1819         } else if (stat_config.run_count == 0) {
1820                 forever = true;
1821                 stat_config.run_count = 1;
1822         }
1823
1824         if (stat_config.walltime_run_table) {
1825                 stat_config.walltime_run = zalloc(stat_config.run_count * sizeof(stat_config.walltime_run[0]));
1826                 if (!stat_config.walltime_run) {
1827                         pr_err("failed to setup -r option");
1828                         goto out;
1829                 }
1830         }
1831
1832         if ((stat_config.aggr_mode == AGGR_THREAD) &&
1833                 !target__has_task(&target)) {
1834                 if (!target.system_wide || target.cpu_list) {
1835                         fprintf(stderr, "The --per-thread option is only "
1836                                 "available when monitoring via -p -t -a "
1837                                 "options or only --per-thread.\n");
1838                         parse_options_usage(NULL, stat_options, "p", 1);
1839                         parse_options_usage(NULL, stat_options, "t", 1);
1840                         goto out;
1841                 }
1842         }
1843
1844         /*
1845          * no_aggr, cgroup are for system-wide only
1846          * --per-thread is aggregated per thread, we dont mix it with cpu mode
1847          */
1848         if (((stat_config.aggr_mode != AGGR_GLOBAL &&
1849               stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
1850             !target__has_cpu(&target)) {
1851                 fprintf(stderr, "both cgroup and no-aggregation "
1852                         "modes only available in system-wide mode\n");
1853
1854                 parse_options_usage(stat_usage, stat_options, "G", 1);
1855                 parse_options_usage(NULL, stat_options, "A", 1);
1856                 parse_options_usage(NULL, stat_options, "a", 1);
1857                 goto out;
1858         }
1859
1860         if (add_default_attributes())
1861                 goto out;
1862
1863         target__validate(&target);
1864
1865         if ((stat_config.aggr_mode == AGGR_THREAD) && (target.system_wide))
1866                 target.per_thread = true;
1867
1868         if (perf_evlist__create_maps(evsel_list, &target) < 0) {
1869                 if (target__has_task(&target)) {
1870                         pr_err("Problems finding threads of monitor\n");
1871                         parse_options_usage(stat_usage, stat_options, "p", 1);
1872                         parse_options_usage(NULL, stat_options, "t", 1);
1873                 } else if (target__has_cpu(&target)) {
1874                         perror("failed to parse CPUs map");
1875                         parse_options_usage(stat_usage, stat_options, "C", 1);
1876                         parse_options_usage(NULL, stat_options, "a", 1);
1877                 }
1878                 goto out;
1879         }
1880
1881         /*
1882          * Initialize thread_map with comm names,
1883          * so we could print it out on output.
1884          */
1885         if (stat_config.aggr_mode == AGGR_THREAD) {
1886                 thread_map__read_comms(evsel_list->threads);
1887                 if (target.system_wide) {
1888                         if (runtime_stat_new(&stat_config,
1889                                 thread_map__nr(evsel_list->threads))) {
1890                                 goto out;
1891                         }
1892                 }
1893         }
1894
1895         if (stat_config.times && interval)
1896                 interval_count = true;
1897         else if (stat_config.times && !interval) {
1898                 pr_err("interval-count option should be used together with "
1899                                 "interval-print.\n");
1900                 parse_options_usage(stat_usage, stat_options, "interval-count", 0);
1901                 parse_options_usage(stat_usage, stat_options, "I", 1);
1902                 goto out;
1903         }
1904
1905         if (timeout && timeout < 100) {
1906                 if (timeout < 10) {
1907                         pr_err("timeout must be >= 10ms.\n");
1908                         parse_options_usage(stat_usage, stat_options, "timeout", 0);
1909                         goto out;
1910                 } else
1911                         pr_warning("timeout < 100ms. "
1912                                    "The overhead percentage could be high in some cases. "
1913                                    "Please proceed with caution.\n");
1914         }
1915         if (timeout && interval) {
1916                 pr_err("timeout option is not supported with interval-print.\n");
1917                 parse_options_usage(stat_usage, stat_options, "timeout", 0);
1918                 parse_options_usage(stat_usage, stat_options, "I", 1);
1919                 goto out;
1920         }
1921
1922         if (perf_evlist__alloc_stats(evsel_list, interval))
1923                 goto out;
1924
1925         if (perf_stat_init_aggr_mode())
1926                 goto out;
1927
1928         /*
1929          * Set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
1930          * while avoiding that older tools show confusing messages.
1931          *
1932          * However for pipe sessions we need to keep it zero,
1933          * because script's perf_evsel__check_attr is triggered
1934          * by attr->sample_type != 0, and we can't run it on
1935          * stat sessions.
1936          */
1937         stat_config.identifier = !(STAT_RECORD && perf_stat.data.is_pipe);
1938
1939         /*
1940          * We dont want to block the signals - that would cause
1941          * child tasks to inherit that and Ctrl-C would not work.
1942          * What we want is for Ctrl-C to work in the exec()-ed
1943          * task, but being ignored by perf stat itself:
1944          */
1945         atexit(sig_atexit);
1946         if (!forever)
1947                 signal(SIGINT,  skip_signal);
1948         signal(SIGCHLD, skip_signal);
1949         signal(SIGALRM, skip_signal);
1950         signal(SIGABRT, skip_signal);
1951
1952         status = 0;
1953         for (run_idx = 0; forever || run_idx < stat_config.run_count; run_idx++) {
1954                 if (stat_config.run_count != 1 && verbose > 0)
1955                         fprintf(output, "[ perf stat: executing run #%d ... ]\n",
1956                                 run_idx + 1);
1957
1958                 status = run_perf_stat(argc, argv, run_idx);
1959                 if (forever && status != -1) {
1960                         print_counters(NULL, argc, argv);
1961                         perf_stat__reset_stats();
1962                 }
1963         }
1964
1965         if (!forever && status != -1 && !interval)
1966                 print_counters(NULL, argc, argv);
1967
1968         if (STAT_RECORD) {
1969                 /*
1970                  * We synthesize the kernel mmap record just so that older tools
1971                  * don't emit warnings about not being able to resolve symbols
1972                  * due to /proc/sys/kernel/kptr_restrict settings and instear provide
1973                  * a saner message about no samples being in the perf.data file.
1974                  *
1975                  * This also serves to suppress a warning about f_header.data.size == 0
1976                  * in header.c at the moment 'perf stat record' gets introduced, which
1977                  * is not really needed once we start adding the stat specific PERF_RECORD_
1978                  * records, but the need to suppress the kptr_restrict messages in older
1979                  * tools remain  -acme
1980                  */
1981                 int fd = perf_data__fd(&perf_stat.data);
1982                 int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
1983                                                              process_synthesized_event,
1984                                                              &perf_stat.session->machines.host);
1985                 if (err) {
1986                         pr_warning("Couldn't synthesize the kernel mmap record, harmless, "
1987                                    "older tools may produce warnings about this file\n.");
1988                 }
1989
1990                 if (!interval) {
1991                         if (WRITE_STAT_ROUND_EVENT(walltime_nsecs_stats.max, FINAL))
1992                                 pr_err("failed to write stat round event\n");
1993                 }
1994
1995                 if (!perf_stat.data.is_pipe) {
1996                         perf_stat.session->header.data_size += perf_stat.bytes_written;
1997                         perf_session__write_header(perf_stat.session, evsel_list, fd, true);
1998                 }
1999
2000                 perf_session__delete(perf_stat.session);
2001         }
2002
2003         perf_stat__exit_aggr_mode();
2004         perf_evlist__free_stats(evsel_list);
2005 out:
2006         zfree(&stat_config.walltime_run);
2007
2008         if (smi_cost && smi_reset)
2009                 sysfs__write_int(FREEZE_ON_SMI_PATH, 0);
2010
2011         perf_evlist__delete(evsel_list);
2012
2013         runtime_stat_delete(&stat_config);
2014
2015         return status;
2016 }