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 "builtin.h"
  44 #include "perf.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_map.h"
  58 #include "util/counts.h"
  59 #include "util/group.h"
  60 #include "util/session.h"
  61 #include "util/tool.h"
  62 #include "util/string2.h"
  63 #include "util/metricgroup.h"
  64 #include "util/synthetic-events.h"
  65 #include "util/target.h"
  66 #include "util/time-utils.h"
  67 #include "util/top.h"
  68 #include "util/affinity.h"
  69 #include "asm/bug.h"
  70
  71 #include <linux/time64.h>
  72 #include <linux/zalloc.h>
  73 #include <api/fs/fs.h>
  74 #include <errno.h>
  75 #include <signal.h>
  76 #include <stdlib.h>
  77 #include <sys/prctl.h>
  78 #include <inttypes.h>
  79 #include <locale.h>
  80 #include <math.h>
  81 #include <sys/types.h>
  82 #include <sys/stat.h>
  83 #include <sys/wait.h>
  84 #include <unistd.h>
  85 #include <sys/time.h>
  86 #include <sys/resource.h>
  87 #include <linux/err.h>
  88
  89 #include <linux/ctype.h>
  90 #include <perf/evlist.h>
  91
  92 #define DEFAULT_SEPARATOR       " "
  93 #define FREEZE_ON_SMI_PATH      "devices/cpu/freeze_on_smi"
  94
  95 static void print_counters(struct timespec *ts, int argc, const char **argv);
  96
  97 /* Default events used for perf stat -T */
  98 static const char *transaction_attrs = {
  99         "task-clock,"
 100         "{"
 101         "instructions,"
 102         "cycles,"
 103         "cpu/cycles-t/,"
 104         "cpu/tx-start/,"
 105         "cpu/el-start/,"
 106         "cpu/cycles-ct/"
 107         "}"
 108 };
 109
 110 /* More limited version when the CPU does not have all events. */
 111 static const char * transaction_limited_attrs = {
 112         "task-clock,"
 113         "{"
 114         "instructions,"
 115         "cycles,"
 116         "cpu/cycles-t/,"
 117         "cpu/tx-start/"
 118         "}"
 119 };
 120
 121 static const char * topdown_attrs[] = {
 122         "topdown-total-slots",
 123         "topdown-slots-retired",
 124         "topdown-recovery-bubbles",
 125         "topdown-fetch-bubbles",
 126         "topdown-slots-issued",
 127         NULL,
 128 };
 129
 130 static const char *smi_cost_attrs = {
 131         "{"
 132         "msr/aperf/,"
 133         "msr/smi/,"
 134         "cycles"
 135         "}"
 136 };
 137
 138 static struct evlist    *evsel_list;
 139
 140 static struct target target = {
 141         .uid    = UINT_MAX,
 142 };
 143
 144 #define METRIC_ONLY_LEN 20
 145
 146 static volatile pid_t           child_pid                       = -1;
 147 static int                      detailed_run                    =  0;
 148 static bool                     transaction_run;
 149 static bool                     topdown_run                     = false;
 150 static bool                     smi_cost                        = false;
 151 static bool                     smi_reset                       = false;
 152 static int                      big_num_opt                     =  -1;
 153 static bool                     group                           = false;
 154 static const char               *pre_cmd                        = NULL;
 155 static const char               *post_cmd                       = NULL;
 156 static bool                     sync_run                        = false;
 157 static bool                     forever                         = false;
 158 static bool                     force_metric_only               = false;
 159 static struct timespec          ref_time;
 160 static bool                     append_file;
 161 static bool                     interval_count;
 162 static const char               *output_name;
 163 static int                      output_fd;
 164
 165 struct perf_stat {
 166         bool                     record;
 167         struct perf_data         data;
 168         struct perf_session     *session;
 169         u64                      bytes_written;
 170         struct perf_tool         tool;
 171         bool                     maps_allocated;
 172         struct perf_cpu_map     *cpus;
 173         struct perf_thread_map *threads;
 174         enum aggr_mode           aggr_mode;
 175 };
 176
 177 static struct perf_stat         perf_stat;
 178 #define STAT_RECORD             perf_stat.record
 179
 180 static volatile int done = 0;
 181
 182 static struct perf_stat_config stat_config = {
 183         .aggr_mode              = AGGR_GLOBAL,
 184         .scale                  = true,
 185         .unit_width             = 4, /* strlen("unit") */
 186         .run_count              = 1,
 187         .metric_only_len        = METRIC_ONLY_LEN,
 188         .walltime_nsecs_stats   = &walltime_nsecs_stats,
 189         .big_num                = true,
 190 };
 191
 192 static inline void diff_timespec(struct timespec *r, struct timespec *a,
 193                                  struct timespec *b)
 194 {
 195         r->tv_sec = a->tv_sec - b->tv_sec;
 196         if (a->tv_nsec < b->tv_nsec) {
 197                 r->tv_nsec = a->tv_nsec + NSEC_PER_SEC - b->tv_nsec;
 198                 r->tv_sec--;
 199         } else {
 200                 r->tv_nsec = a->tv_nsec - b->tv_nsec ;
 201         }
 202 }
 203
 204 static void perf_stat__reset_stats(void)
 205 {
 206         int i;
 207
 208         perf_evlist__reset_stats(evsel_list);
 209         perf_stat__reset_shadow_stats();
 210
 211         for (i = 0; i < stat_config.stats_num; i++)
 212                 perf_stat__reset_shadow_per_stat(&stat_config.stats[i]);
 213 }
 214
 215 static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
 216                                      union perf_event *event,
 217                                      struct perf_sample *sample __maybe_unused,
 218                                      struct machine *machine __maybe_unused)
 219 {
 220         if (perf_data__write(&perf_stat.data, event, event->header.size) < 0) {
 221                 pr_err("failed to write perf data, error: %m\n");
 222                 return -1;
 223         }
 224
 225         perf_stat.bytes_written += event->header.size;
 226         return 0;
 227 }
 228
 229 static int write_stat_round_event(u64 tm, u64 type)
 230 {
 231         return perf_event__synthesize_stat_round(NULL, tm, type,
 232                                                  process_synthesized_event,
 233                                                  NULL);
 234 }
 235
 236 #define WRITE_STAT_ROUND_EVENT(time, interval) \
 237         write_stat_round_event(time, PERF_STAT_ROUND_TYPE__ ## interval)
 238
 239 #define SID(e, x, y) xyarray__entry(e->core.sample_id, x, y)
 240
 241 static int
 242 perf_evsel__write_stat_event(struct evsel *counter, u32 cpu, u32 thread,
 243                              struct perf_counts_values *count)
 244 {
 245         struct perf_sample_id *sid = SID(counter, cpu, thread);
 246
 247         return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
 248                                            process_synthesized_event, NULL);
 249 }
 250
 251 static int read_single_counter(struct evsel *counter, int cpu,
 252                                int thread, struct timespec *rs)
 253 {
 254         if (counter->tool_event == PERF_TOOL_DURATION_TIME) {
 255                 u64 val = rs->tv_nsec + rs->tv_sec*1000000000ULL;
 256                 struct perf_counts_values *count =
 257                         perf_counts(counter->counts, cpu, thread);
 258                 count->ena = count->run = val;
 259                 count->val = val;
 260                 return 0;
 261         }
 262         return perf_evsel__read_counter(counter, cpu, thread);
 263 }
 264
 265 /*
 266  * Read out the results of a single counter:
 267  * do not aggregate counts across CPUs in system-wide mode
 268  */
 269 static int read_counter_cpu(struct evsel *counter, struct timespec *rs, int cpu)
 270 {
 271         int nthreads = perf_thread_map__nr(evsel_list->core.threads);
 272         int thread;
 273
 274         if (!counter->supported)
 275                 return -ENOENT;
 276
 277         if (counter->core.system_wide)
 278                 nthreads = 1;
 279
 280         for (thread = 0; thread < nthreads; thread++) {
 281                 struct perf_counts_values *count;
 282
 283                 count = perf_counts(counter->counts, cpu, thread);
 284
 285                 /*
 286                  * The leader's group read loads data into its group members
 287                  * (via perf_evsel__read_counter()) and sets their count->loaded.
 288                  */
 289                 if (!perf_counts__is_loaded(counter->counts, cpu, thread) &&
 290                     read_single_counter(counter, cpu, thread, rs)) {
 291                         counter->counts->scaled = -1;
 292                         perf_counts(counter->counts, cpu, thread)->ena = 0;
 293                         perf_counts(counter->counts, cpu, thread)->run = 0;
 294                         return -1;
 295                 }
 296
 297                 perf_counts__set_loaded(counter->counts, cpu, thread, false);
 298
 299                 if (STAT_RECORD) {
 300                         if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
 301                                 pr_err("failed to write stat event\n");
 302                                 return -1;
 303                         }
 304                 }
 305
 306                 if (verbose > 1) {
 307                         fprintf(stat_config.output,
 308                                 "%s: %d: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
 309                                         perf_evsel__name(counter),
 310                                         cpu,
 311                                         count->val, count->ena, count->run);
 312                 }
 313         }
 314
 315         return 0;
 316 }
 317
 318 static void read_counters(struct timespec *rs)
 319 {
 320         struct evsel *counter;
 321         struct affinity affinity;
 322         int i, ncpus, cpu;
 323
 324         if (affinity__setup(&affinity) < 0)
 325                 return;
 326
 327         ncpus = perf_cpu_map__nr(evsel_list->core.all_cpus);
 328         if (!target__has_cpu(&target) || target__has_per_thread(&target))
 329                 ncpus = 1;
 330         evlist__for_each_cpu(evsel_list, i, cpu) {
 331                 if (i >= ncpus)
 332                         break;
 333                 affinity__set(&affinity, cpu);
 334
 335                 evlist__for_each_entry(evsel_list, counter) {
 336                         if (evsel__cpu_iter_skip(counter, cpu))
 337                                 continue;
 338                         if (!counter->err) {
 339                                 counter->err = read_counter_cpu(counter, rs,
 340                                                                 counter->cpu_iter - 1);
 341                         }
 342                 }
 343         }
 344         affinity__cleanup(&affinity);
 345
 346         evlist__for_each_entry(evsel_list, counter) {
 347                 if (counter->err)
 348                         pr_debug("failed to read counter %s\n", counter->name);
 349                 if (counter->err == 0 && perf_stat_process_counter(&stat_config, counter))
 350                         pr_warning("failed to process counter %s\n", counter->name);
 351                 counter->err = 0;
 352         }
 353 }
 354
 355 static void process_interval(void)
 356 {
 357         struct timespec ts, rs;
 358
 359         clock_gettime(CLOCK_MONOTONIC, &ts);
 360         diff_timespec(&rs, &ts, &ref_time);
 361
 362         read_counters(&rs);
 363
 364         if (STAT_RECORD) {
 365                 if (WRITE_STAT_ROUND_EVENT(rs.tv_sec * NSEC_PER_SEC + rs.tv_nsec, INTERVAL))
 366                         pr_err("failed to write stat round event\n");
 367         }
 368
 369         init_stats(&walltime_nsecs_stats);
 370         update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
 371         print_counters(&rs, 0, NULL);
 372 }
 373
 374 static void enable_counters(void)
 375 {
 376         if (stat_config.initial_delay)
 377                 usleep(stat_config.initial_delay * USEC_PER_MSEC);
 378
 379         /*
 380          * We need to enable counters only if:
 381          * - we don't have tracee (attaching to task or cpu)
 382          * - we have initial delay configured
 383          */
 384         if (!target__none(&target) || stat_config.initial_delay)
 385                 evlist__enable(evsel_list);
 386 }
 387
 388 static void disable_counters(void)
 389 {
 390         /*
 391          * If we don't have tracee (attaching to task or cpu), counters may
 392          * still be running. To get accurate group ratios, we must stop groups
 393          * from counting before reading their constituent counters.
 394          */
 395         if (!target__none(&target))
 396                 evlist__disable(evsel_list);
 397 }
 398
 399 static volatile int workload_exec_errno;
 400
 401 /*
 402  * perf_evlist__prepare_workload will send a SIGUSR1
 403  * if the fork fails, since we asked by setting its
 404  * want_signal to true.
 405  */
 406 static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
 407                                         void *ucontext __maybe_unused)
 408 {
 409         workload_exec_errno = info->si_value.sival_int;
 410 }
 411
 412 static bool perf_evsel__should_store_id(struct evsel *counter)
 413 {
 414         return STAT_RECORD || counter->core.attr.read_format & PERF_FORMAT_ID;
 415 }
 416
 417 static bool is_target_alive(struct target *_target,
 418                             struct perf_thread_map *threads)
 419 {
 420         struct stat st;
 421         int i;
 422
 423         if (!target__has_task(_target))
 424                 return true;
 425
 426         for (i = 0; i < threads->nr; i++) {
 427                 char path[PATH_MAX];
 428
 429                 scnprintf(path, PATH_MAX, "%s/%d", procfs__mountpoint(),
 430                           threads->map[i].pid);
 431
 432                 if (!stat(path, &st))
 433                         return true;
 434         }
 435
 436         return false;
 437 }
 438
 439 enum counter_recovery {
 440         COUNTER_SKIP,
 441         COUNTER_RETRY,
 442         COUNTER_FATAL,
 443 };
 444
 445 static enum counter_recovery stat_handle_error(struct evsel *counter)
 446 {
 447         char msg[BUFSIZ];
 448         /*
 449          * PPC returns ENXIO for HW counters until 2.6.37
 450          * (behavior changed with commit b0a873e).
 451          */
 452         if (errno == EINVAL || errno == ENOSYS ||
 453             errno == ENOENT || errno == EOPNOTSUPP ||
 454             errno == ENXIO) {
 455                 if (verbose > 0)
 456                         ui__warning("%s event is not supported by the kernel.\n",
 457                                     perf_evsel__name(counter));
 458                 counter->supported = false;
 459                 /*
 460                  * errored is a sticky flag that means one of the counter's
 461                  * cpu event had a problem and needs to be reexamined.
 462                  */
 463                 counter->errored = true;
 464
 465                 if ((counter->leader != counter) ||
 466                     !(counter->leader->core.nr_members > 1))
 467                         return COUNTER_SKIP;
 468         } else if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
 469                 if (verbose > 0)
 470                         ui__warning("%s\n", msg);
 471                 return COUNTER_RETRY;
 472         } else if (target__has_per_thread(&target) &&
 473                    evsel_list->core.threads &&
 474                    evsel_list->core.threads->err_thread != -1) {
 475                 /*
 476                  * For global --per-thread case, skip current
 477                  * error thread.
 478                  */
 479                 if (!thread_map__remove(evsel_list->core.threads,
 480                                         evsel_list->core.threads->err_thread)) {
 481                         evsel_list->core.threads->err_thread = -1;
 482                         return COUNTER_RETRY;
 483                 }
 484         }
 485
 486         perf_evsel__open_strerror(counter, &target,
 487                                   errno, msg, sizeof(msg));
 488         ui__error("%s\n", msg);
 489
 490         if (child_pid != -1)
 491                 kill(child_pid, SIGTERM);
 492         return COUNTER_FATAL;
 493 }
 494
 495 static int __run_perf_stat(int argc, const char **argv, int run_idx)
 496 {
 497         int interval = stat_config.interval;
 498         int times = stat_config.times;
 499         int timeout = stat_config.timeout;
 500         char msg[BUFSIZ];
 501         unsigned long long t0, t1;
 502         struct 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.data.is_pipe : false;
 508         struct affinity affinity;
 509         int i, cpu;
 510         bool second_pass = false;
 511
 512         if (interval) {
 513                 ts.tv_sec  = interval / USEC_PER_MSEC;
 514                 ts.tv_nsec = (interval % USEC_PER_MSEC) * NSEC_PER_MSEC;
 515         } else if (timeout) {
 516                 ts.tv_sec  = timeout / USEC_PER_MSEC;
 517                 ts.tv_nsec = (timeout % USEC_PER_MSEC) * NSEC_PER_MSEC;
 518         } else {
 519                 ts.tv_sec  = 1;
 520                 ts.tv_nsec = 0;
 521         }
 522
 523         if (forks) {
 524                 if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
 525                                                   workload_exec_failed_signal) < 0) {
 526                         perror("failed to prepare workload");
 527                         return -1;
 528                 }
 529                 child_pid = evsel_list->workload.pid;
 530         }
 531
 532         if (group)
 533                 perf_evlist__set_leader(evsel_list);
 534
 535         if (affinity__setup(&affinity) < 0)
 536                 return -1;
 537
 538         evlist__for_each_cpu (evsel_list, i, cpu) {
 539                 affinity__set(&affinity, cpu);
 540
 541                 evlist__for_each_entry(evsel_list, counter) {
 542                         if (evsel__cpu_iter_skip(counter, cpu))
 543                                 continue;
 544                         if (counter->reset_group || counter->errored)
 545                                 continue;
 546 try_again:
 547                         if (create_perf_stat_counter(counter, &stat_config, &target,
 548                                                      counter->cpu_iter - 1) < 0) {
 549
 550                                 /*
 551                                  * Weak group failed. We cannot just undo this here
 552                                  * because earlier CPUs might be in group mode, and the kernel
 553                                  * doesn't support mixing group and non group reads. Defer
 554                                  * it to later.
 555                                  * Don't close here because we're in the wrong affinity.
 556                                  */
 557                                 if ((errno == EINVAL || errno == EBADF) &&
 558                                     counter->leader != counter &&
 559                                     counter->weak_group) {
 560                                         perf_evlist__reset_weak_group(evsel_list, counter, false);
 561                                         assert(counter->reset_group);
 562                                         second_pass = true;
 563                                         continue;
 564                                 }
 565
 566                                 switch (stat_handle_error(counter)) {
 567                                 case COUNTER_FATAL:
 568                                         return -1;
 569                                 case COUNTER_RETRY:
 570                                         goto try_again;
 571                                 case COUNTER_SKIP:
 572                                         continue;
 573                                 default:
 574                                         break;
 575                                 }
 576
 577                         }
 578                         counter->supported = true;
 579                 }
 580         }
 581
 582         if (second_pass) {
 583                 /*
 584                  * Now redo all the weak group after closing them,
 585                  * and also close errored counters.
 586                  */
 587
 588                 evlist__for_each_cpu(evsel_list, i, cpu) {
 589                         affinity__set(&affinity, cpu);
 590                         /* First close errored or weak retry */
 591                         evlist__for_each_entry(evsel_list, counter) {
 592                                 if (!counter->reset_group && !counter->errored)
 593                                         continue;
 594                                 if (evsel__cpu_iter_skip_no_inc(counter, cpu))
 595                                         continue;
 596                                 perf_evsel__close_cpu(&counter->core, counter->cpu_iter);
 597                         }
 598                         /* Now reopen weak */
 599                         evlist__for_each_entry(evsel_list, counter) {
 600                                 if (!counter->reset_group && !counter->errored)
 601                                         continue;
 602                                 if (evsel__cpu_iter_skip(counter, cpu))
 603                                         continue;
 604                                 if (!counter->reset_group)
 605                                         continue;
 606 try_again_reset:
 607                                 pr_debug2("reopening weak %s\n", perf_evsel__name(counter));
 608                                 if (create_perf_stat_counter(counter, &stat_config, &target,
 609                                                              counter->cpu_iter - 1) < 0) {
 610
 611                                         switch (stat_handle_error(counter)) {
 612                                         case COUNTER_FATAL:
 613                                                 return -1;
 614                                         case COUNTER_RETRY:
 615                                                 goto try_again_reset;
 616                                         case COUNTER_SKIP:
 617                                                 continue;
 618                                         default:
 619                                                 break;
 620                                         }
 621                                 }
 622                                 counter->supported = true;
 623                         }
 624                 }
 625         }
 626         affinity__cleanup(&affinity);
 627
 628         evlist__for_each_entry(evsel_list, counter) {
 629                 if (!counter->supported) {
 630                         perf_evsel__free_fd(&counter->core);
 631                         continue;
 632                 }
 633
 634                 l = strlen(counter->unit);
 635                 if (l > stat_config.unit_width)
 636                         stat_config.unit_width = l;
 637
 638                 if (perf_evsel__should_store_id(counter) &&
 639                     perf_evsel__store_ids(counter, evsel_list))
 640                         return -1;
 641         }
 642
 643         if (perf_evlist__apply_filters(evsel_list, &counter)) {
 644                 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
 645                         counter->filter, perf_evsel__name(counter), errno,
 646                         str_error_r(errno, msg, sizeof(msg)));
 647                 return -1;
 648         }
 649
 650         if (STAT_RECORD) {
 651                 int err, fd = perf_data__fd(&perf_stat.data);
 652
 653                 if (is_pipe) {
 654                         err = perf_header__write_pipe(perf_data__fd(&perf_stat.data));
 655                 } else {
 656                         err = perf_session__write_header(perf_stat.session, evsel_list,
 657                                                          fd, false);
 658                 }
 659
 660                 if (err < 0)
 661                         return err;
 662
 663                 err = perf_event__synthesize_stat_events(&stat_config, NULL, evsel_list,
 664                                                          process_synthesized_event, is_pipe);
 665                 if (err < 0)
 666                         return err;
 667         }
 668
 669         /*
 670          * Enable counters and exec the command:
 671          */
 672         t0 = rdclock();
 673         clock_gettime(CLOCK_MONOTONIC, &ref_time);
 674
 675         if (forks) {
 676                 perf_evlist__start_workload(evsel_list);
 677                 enable_counters();
 678
 679                 if (interval || timeout) {
 680                         while (!waitpid(child_pid, &status, WNOHANG)) {
 681                                 nanosleep(&ts, NULL);
 682                                 if (timeout)
 683                                         break;
 684                                 process_interval();
 685                                 if (interval_count && !(--times))
 686                                         break;
 687                         }
 688                 }
 689                 if (child_pid != -1)
 690                         wait4(child_pid, &status, 0, &stat_config.ru_data);
 691
 692                 if (workload_exec_errno) {
 693                         const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
 694                         pr_err("Workload failed: %s\n", emsg);
 695                         return -1;
 696                 }
 697
 698                 if (WIFSIGNALED(status))
 699                         psignal(WTERMSIG(status), argv[0]);
 700         } else {
 701                 enable_counters();
 702                 while (!done) {
 703                         nanosleep(&ts, NULL);
 704                         if (!is_target_alive(&target, evsel_list->core.threads))
 705                                 break;
 706                         if (timeout)
 707                                 break;
 708                         if (interval) {
 709                                 process_interval();
 710                                 if (interval_count && !(--times))
 711                                         break;
 712                         }
 713                 }
 714         }
 715
 716         disable_counters();
 717
 718         t1 = rdclock();
 719
 720         if (stat_config.walltime_run_table)
 721                 stat_config.walltime_run[run_idx] = t1 - t0;
 722
 723         update_stats(&walltime_nsecs_stats, t1 - t0);
 724
 725         /*
 726          * Closing a group leader splits the group, and as we only disable
 727          * group leaders, results in remaining events becoming enabled. To
 728          * avoid arbitrary skew, we must read all counters before closing any
 729          * group leaders.
 730          */
 731         read_counters(&(struct timespec) { .tv_nsec = t1-t0 });
 732
 733         /*
 734          * We need to keep evsel_list alive, because it's processed
 735          * later the evsel_list will be closed after.
 736          */
 737         if (!STAT_RECORD)
 738                 evlist__close(evsel_list);
 739
 740         return WEXITSTATUS(status);
 741 }
 742
 743 static int run_perf_stat(int argc, const char **argv, int run_idx)
 744 {
 745         int ret;
 746
 747         if (pre_cmd) {
 748                 ret = system(pre_cmd);
 749                 if (ret)
 750                         return ret;
 751         }
 752
 753         if (sync_run)
 754                 sync();
 755
 756         ret = __run_perf_stat(argc, argv, run_idx);
 757         if (ret)
 758                 return ret;
 759
 760         if (post_cmd) {
 761                 ret = system(post_cmd);
 762                 if (ret)
 763                         return ret;
 764         }
 765
 766         return ret;
 767 }
 768
 769 static void print_counters(struct timespec *ts, int argc, const char **argv)
 770 {
 771         /* Do not print anything if we record to the pipe. */
 772         if (STAT_RECORD && perf_stat.data.is_pipe)
 773                 return;
 774
 775         perf_evlist__print_counters(evsel_list, &stat_config, &target,
 776                                     ts, argc, argv);
 777 }
 778
 779 static volatile int signr = -1;
 780
 781 static void skip_signal(int signo)
 782 {
 783         if ((child_pid == -1) || stat_config.interval)
 784                 done = 1;
 785
 786         signr = signo;
 787         /*
 788          * render child_pid harmless
 789          * won't send SIGTERM to a random
 790          * process in case of race condition
 791          * and fast PID recycling
 792          */
 793         child_pid = -1;
 794 }
 795
 796 static void sig_atexit(void)
 797 {
 798         sigset_t set, oset;
 799
 800         /*
 801          * avoid race condition with SIGCHLD handler
 802          * in skip_signal() which is modifying child_pid
 803          * goal is to avoid send SIGTERM to a random
 804          * process
 805          */
 806         sigemptyset(&set);
 807         sigaddset(&set, SIGCHLD);
 808         sigprocmask(SIG_BLOCK, &set, &oset);
 809
 810         if (child_pid != -1)
 811                 kill(child_pid, SIGTERM);
 812
 813         sigprocmask(SIG_SETMASK, &oset, NULL);
 814
 815         if (signr == -1)
 816                 return;
 817
 818         signal(signr, SIG_DFL);
 819         kill(getpid(), signr);
 820 }
 821
 822 static int stat__set_big_num(const struct option *opt __maybe_unused,
 823                              const char *s __maybe_unused, int unset)
 824 {
 825         big_num_opt = unset ? 0 : 1;
 826         return 0;
 827 }
 828
 829 static int enable_metric_only(const struct option *opt __maybe_unused,
 830                               const char *s __maybe_unused, int unset)
 831 {
 832         force_metric_only = true;
 833         stat_config.metric_only = !unset;
 834         return 0;
 835 }
 836
 837 static int parse_metric_groups(const struct option *opt,
 838                                const char *str,
 839                                int unset __maybe_unused)
 840 {
 841         return metricgroup__parse_groups(opt, str, &stat_config.metric_events);
 842 }
 843
 844 static struct option stat_options[] = {
 845         OPT_BOOLEAN('T', "transaction", &transaction_run,
 846                     "hardware transaction statistics"),
 847         OPT_CALLBACK('e', "event", &evsel_list, "event",
 848                      "event selector. use 'perf list' to list available events",
 849                      parse_events_option),
 850         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
 851                      "event filter", parse_filter),
 852         OPT_BOOLEAN('i', "no-inherit", &stat_config.no_inherit,
 853                     "child tasks do not inherit counters"),
 854         OPT_STRING('p', "pid", &target.pid, "pid",
 855                    "stat events on existing process id"),
 856         OPT_STRING('t', "tid", &target.tid, "tid",
 857                    "stat events on existing thread id"),
 858         OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
 859                     "system-wide collection from all CPUs"),
 860         OPT_BOOLEAN('g', "group", &group,
 861                     "put the counters into a counter group"),
 862         OPT_BOOLEAN(0, "scale", &stat_config.scale,
 863                     "Use --no-scale to disable counter scaling for multiplexing"),
 864         OPT_INCR('v', "verbose", &verbose,
 865                     "be more verbose (show counter open errors, etc)"),
 866         OPT_INTEGER('r', "repeat", &stat_config.run_count,
 867                     "repeat command and print average + stddev (max: 100, forever: 0)"),
 868         OPT_BOOLEAN(0, "table", &stat_config.walltime_run_table,
 869                     "display details about each run (only with -r option)"),
 870         OPT_BOOLEAN('n', "null", &stat_config.null_run,
 871                     "null run - dont start any counters"),
 872         OPT_INCR('d', "detailed", &detailed_run,
 873                     "detailed run - start a lot of events"),
 874         OPT_BOOLEAN('S', "sync", &sync_run,
 875                     "call sync() before starting a run"),
 876         OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
 877                            "print large numbers with thousands\' separators",
 878                            stat__set_big_num),
 879         OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
 880                     "list of cpus to monitor in system-wide"),
 881         OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
 882                     "disable CPU count aggregation", AGGR_NONE),
 883         OPT_BOOLEAN(0, "no-merge", &stat_config.no_merge, "Do not merge identical named events"),
 884         OPT_STRING('x', "field-separator", &stat_config.csv_sep, "separator",
 885                    "print counts with custom separator"),
 886         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
 887                      "monitor event in cgroup name only", parse_cgroups),
 888         OPT_STRING('o', "output", &output_name, "file", "output file name"),
 889         OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
 890         OPT_INTEGER(0, "log-fd", &output_fd,
 891                     "log output to fd, instead of stderr"),
 892         OPT_STRING(0, "pre", &pre_cmd, "command",
 893                         "command to run prior to the measured command"),
 894         OPT_STRING(0, "post", &post_cmd, "command",
 895                         "command to run after to the measured command"),
 896         OPT_UINTEGER('I', "interval-print", &stat_config.interval,
 897                     "print counts at regular interval in ms "
 898                     "(overhead is possible for values <= 100ms)"),
 899         OPT_INTEGER(0, "interval-count", &stat_config.times,
 900                     "print counts for fixed number of times"),
 901         OPT_BOOLEAN(0, "interval-clear", &stat_config.interval_clear,
 902                     "clear screen in between new interval"),
 903         OPT_UINTEGER(0, "timeout", &stat_config.timeout,
 904                     "stop workload and print counts after a timeout period in ms (>= 10ms)"),
 905         OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
 906                      "aggregate counts per processor socket", AGGR_SOCKET),
 907         OPT_SET_UINT(0, "per-die", &stat_config.aggr_mode,
 908                      "aggregate counts per processor die", AGGR_DIE),
 909         OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode,
 910                      "aggregate counts per physical processor core", AGGR_CORE),
 911         OPT_SET_UINT(0, "per-thread", &stat_config.aggr_mode,
 912                      "aggregate counts per thread", AGGR_THREAD),
 913         OPT_SET_UINT(0, "per-node", &stat_config.aggr_mode,
 914                      "aggregate counts per numa node", AGGR_NODE),
 915         OPT_UINTEGER('D', "delay", &stat_config.initial_delay,
 916                      "ms to wait before starting measurement after program start"),
 917         OPT_CALLBACK_NOOPT(0, "metric-only", &stat_config.metric_only, NULL,
 918                         "Only print computed metrics. No raw values", enable_metric_only),
 919         OPT_BOOLEAN(0, "topdown", &topdown_run,
 920                         "measure topdown level 1 statistics"),
 921         OPT_BOOLEAN(0, "smi-cost", &smi_cost,
 922                         "measure SMI cost"),
 923         OPT_CALLBACK('M', "metrics", &evsel_list, "metric/metric group list",
 924                      "monitor specified metrics or metric groups (separated by ,)",
 925                      parse_metric_groups),
 926         OPT_BOOLEAN_FLAG(0, "all-kernel", &stat_config.all_kernel,
 927                          "Configure all used events to run in kernel space.",
 928                          PARSE_OPT_EXCLUSIVE),
 929         OPT_BOOLEAN_FLAG(0, "all-user", &stat_config.all_user,
 930                          "Configure all used events to run in user space.",
 931                          PARSE_OPT_EXCLUSIVE),
 932         OPT_BOOLEAN(0, "percore-show-thread", &stat_config.percore_show_thread,
 933                     "Use with 'percore' event qualifier to show the event "
 934                     "counts of one hardware thread by sum up total hardware "
 935                     "threads of same physical core"),
 936         OPT_END()
 937 };
 938
 939 static int perf_stat__get_socket(struct perf_stat_config *config __maybe_unused,
 940                                  struct perf_cpu_map *map, int cpu)
 941 {
 942         return cpu_map__get_socket(map, cpu, NULL);
 943 }
 944
 945 static int perf_stat__get_die(struct perf_stat_config *config __maybe_unused,
 946                               struct perf_cpu_map *map, int cpu)
 947 {
 948         return cpu_map__get_die(map, cpu, NULL);
 949 }
 950
 951 static int perf_stat__get_core(struct perf_stat_config *config __maybe_unused,
 952                                struct perf_cpu_map *map, int cpu)
 953 {
 954         return cpu_map__get_core(map, cpu, NULL);
 955 }
 956
 957 static int perf_stat__get_node(struct perf_stat_config *config __maybe_unused,
 958                                struct perf_cpu_map *map, int cpu)
 959 {
 960         return cpu_map__get_node(map, cpu, NULL);
 961 }
 962
 963 static int perf_stat__get_aggr(struct perf_stat_config *config,
 964                                aggr_get_id_t get_id, struct perf_cpu_map *map, int idx)
 965 {
 966         int cpu;
 967
 968         if (idx >= map->nr)
 969                 return -1;
 970
 971         cpu = map->map[idx];
 972
 973         if (config->cpus_aggr_map->map[cpu] == -1)
 974                 config->cpus_aggr_map->map[cpu] = get_id(config, map, idx);
 975
 976         return config->cpus_aggr_map->map[cpu];
 977 }
 978
 979 static int perf_stat__get_socket_cached(struct perf_stat_config *config,
 980                                         struct perf_cpu_map *map, int idx)
 981 {
 982         return perf_stat__get_aggr(config, perf_stat__get_socket, map, idx);
 983 }
 984
 985 static int perf_stat__get_die_cached(struct perf_stat_config *config,
 986                                         struct perf_cpu_map *map, int idx)
 987 {
 988         return perf_stat__get_aggr(config, perf_stat__get_die, map, idx);
 989 }
 990
 991 static int perf_stat__get_core_cached(struct perf_stat_config *config,
 992                                       struct perf_cpu_map *map, int idx)
 993 {
 994         return perf_stat__get_aggr(config, perf_stat__get_core, map, idx);
 995 }
 996
 997 static int perf_stat__get_node_cached(struct perf_stat_config *config,
 998                                       struct perf_cpu_map *map, int idx)
 999 {
1000         return perf_stat__get_aggr(config, perf_stat__get_node, map, idx);
1001 }
1002
1003 static bool term_percore_set(void)
1004 {
1005         struct evsel *counter;
1006
1007         evlist__for_each_entry(evsel_list, counter) {
1008                 if (counter->percore)
1009                         return true;
1010         }
1011
1012         return false;
1013 }
1014
1015 static int perf_stat_init_aggr_mode(void)
1016 {
1017         int nr;
1018
1019         switch (stat_config.aggr_mode) {
1020         case AGGR_SOCKET:
1021                 if (cpu_map__build_socket_map(evsel_list->core.cpus, &stat_config.aggr_map)) {
1022                         perror("cannot build socket map");
1023                         return -1;
1024                 }
1025                 stat_config.aggr_get_id = perf_stat__get_socket_cached;
1026                 break;
1027         case AGGR_DIE:
1028                 if (cpu_map__build_die_map(evsel_list->core.cpus, &stat_config.aggr_map)) {
1029                         perror("cannot build die map");
1030                         return -1;
1031                 }
1032                 stat_config.aggr_get_id = perf_stat__get_die_cached;
1033                 break;
1034         case AGGR_CORE:
1035                 if (cpu_map__build_core_map(evsel_list->core.cpus, &stat_config.aggr_map)) {
1036                         perror("cannot build core map");
1037                         return -1;
1038                 }
1039                 stat_config.aggr_get_id = perf_stat__get_core_cached;
1040                 break;
1041         case AGGR_NODE:
1042                 if (cpu_map__build_node_map(evsel_list->core.cpus, &stat_config.aggr_map)) {
1043                         perror("cannot build core map");
1044                         return -1;
1045                 }
1046                 stat_config.aggr_get_id = perf_stat__get_node_cached;
1047                 break;
1048         case AGGR_NONE:
1049                 if (term_percore_set()) {
1050                         if (cpu_map__build_core_map(evsel_list->core.cpus,
1051                                                     &stat_config.aggr_map)) {
1052                                 perror("cannot build core map");
1053                                 return -1;
1054                         }
1055                         stat_config.aggr_get_id = perf_stat__get_core_cached;
1056                 }
1057                 break;
1058         case AGGR_GLOBAL:
1059         case AGGR_THREAD:
1060         case AGGR_UNSET:
1061         default:
1062                 break;
1063         }
1064
1065         /*
1066          * The evsel_list->cpus is the base we operate on,
1067          * taking the highest cpu number to be the size of
1068          * the aggregation translate cpumap.
1069          */
1070         nr = perf_cpu_map__max(evsel_list->core.cpus);
1071         stat_config.cpus_aggr_map = perf_cpu_map__empty_new(nr + 1);
1072         return stat_config.cpus_aggr_map ? 0 : -ENOMEM;
1073 }
1074
1075 static void perf_stat__exit_aggr_mode(void)
1076 {
1077         perf_cpu_map__put(stat_config.aggr_map);
1078         perf_cpu_map__put(stat_config.cpus_aggr_map);
1079         stat_config.aggr_map = NULL;
1080         stat_config.cpus_aggr_map = NULL;
1081 }
1082
1083 static inline int perf_env__get_cpu(struct perf_env *env, struct perf_cpu_map *map, int idx)
1084 {
1085         int cpu;
1086
1087         if (idx > map->nr)
1088                 return -1;
1089
1090         cpu = map->map[idx];
1091
1092         if (cpu >= env->nr_cpus_avail)
1093                 return -1;
1094
1095         return cpu;
1096 }
1097
1098 static int perf_env__get_socket(struct perf_cpu_map *map, int idx, void *data)
1099 {
1100         struct perf_env *env = data;
1101         int cpu = perf_env__get_cpu(env, map, idx);
1102
1103         return cpu == -1 ? -1 : env->cpu[cpu].socket_id;
1104 }
1105
1106 static int perf_env__get_die(struct perf_cpu_map *map, int idx, void *data)
1107 {
1108         struct perf_env *env = data;
1109         int die_id = -1, cpu = perf_env__get_cpu(env, map, idx);
1110
1111         if (cpu != -1) {
1112                 /*
1113                  * Encode socket in bit range 15:8
1114                  * die_id is relative to socket,
1115                  * we need a global id. So we combine
1116                  * socket + die id
1117                  */
1118                 if (WARN_ONCE(env->cpu[cpu].socket_id >> 8, "The socket id number is too big.\n"))
1119                         return -1;
1120
1121                 if (WARN_ONCE(env->cpu[cpu].die_id >> 8, "The die id number is too big.\n"))
1122                         return -1;
1123
1124                 die_id = (env->cpu[cpu].socket_id << 8) | (env->cpu[cpu].die_id & 0xff);
1125         }
1126
1127         return die_id;
1128 }
1129
1130 static int perf_env__get_core(struct perf_cpu_map *map, int idx, void *data)
1131 {
1132         struct perf_env *env = data;
1133         int core = -1, cpu = perf_env__get_cpu(env, map, idx);
1134
1135         if (cpu != -1) {
1136                 /*
1137                  * Encode socket in bit range 31:24
1138                  * encode die id in bit range 23:16
1139                  * core_id is relative to socket and die,
1140                  * we need a global id. So we combine
1141                  * socket + die id + core id
1142                  */
1143                 if (WARN_ONCE(env->cpu[cpu].socket_id >> 8, "The socket id number is too big.\n"))
1144                         return -1;
1145
1146                 if (WARN_ONCE(env->cpu[cpu].die_id >> 8, "The die id number is too big.\n"))
1147                         return -1;
1148
1149                 if (WARN_ONCE(env->cpu[cpu].core_id >> 16, "The core id number is too big.\n"))
1150                         return -1;
1151
1152                 core = (env->cpu[cpu].socket_id << 24) |
1153                        (env->cpu[cpu].die_id << 16) |
1154                        (env->cpu[cpu].core_id & 0xffff);
1155         }
1156
1157         return core;
1158 }
1159
1160 static int perf_env__get_node(struct perf_cpu_map *map, int idx, void *data)
1161 {
1162         int cpu = perf_env__get_cpu(data, map, idx);
1163
1164         return perf_env__numa_node(data, cpu);
1165 }
1166
1167 static int perf_env__build_socket_map(struct perf_env *env, struct perf_cpu_map *cpus,
1168                                       struct perf_cpu_map **sockp)
1169 {
1170         return cpu_map__build_map(cpus, sockp, perf_env__get_socket, env);
1171 }
1172
1173 static int perf_env__build_die_map(struct perf_env *env, struct perf_cpu_map *cpus,
1174                                    struct perf_cpu_map **diep)
1175 {
1176         return cpu_map__build_map(cpus, diep, perf_env__get_die, env);
1177 }
1178
1179 static int perf_env__build_core_map(struct perf_env *env, struct perf_cpu_map *cpus,
1180                                     struct perf_cpu_map **corep)
1181 {
1182         return cpu_map__build_map(cpus, corep, perf_env__get_core, env);
1183 }
1184
1185 static int perf_env__build_node_map(struct perf_env *env, struct perf_cpu_map *cpus,
1186                                     struct perf_cpu_map **nodep)
1187 {
1188         return cpu_map__build_map(cpus, nodep, perf_env__get_node, env);
1189 }
1190
1191 static int perf_stat__get_socket_file(struct perf_stat_config *config __maybe_unused,
1192                                       struct perf_cpu_map *map, int idx)
1193 {
1194         return perf_env__get_socket(map, idx, &perf_stat.session->header.env);
1195 }
1196 static int perf_stat__get_die_file(struct perf_stat_config *config __maybe_unused,
1197                                    struct perf_cpu_map *map, int idx)
1198 {
1199         return perf_env__get_die(map, idx, &perf_stat.session->header.env);
1200 }
1201
1202 static int perf_stat__get_core_file(struct perf_stat_config *config __maybe_unused,
1203                                     struct perf_cpu_map *map, int idx)
1204 {
1205         return perf_env__get_core(map, idx, &perf_stat.session->header.env);
1206 }
1207
1208 static int perf_stat__get_node_file(struct perf_stat_config *config __maybe_unused,
1209                                     struct perf_cpu_map *map, int idx)
1210 {
1211         return perf_env__get_node(map, idx, &perf_stat.session->header.env);
1212 }
1213
1214 static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
1215 {
1216         struct perf_env *env = &st->session->header.env;
1217
1218         switch (stat_config.aggr_mode) {
1219         case AGGR_SOCKET:
1220                 if (perf_env__build_socket_map(env, evsel_list->core.cpus, &stat_config.aggr_map)) {
1221                         perror("cannot build socket map");
1222                         return -1;
1223                 }
1224                 stat_config.aggr_get_id = perf_stat__get_socket_file;
1225                 break;
1226         case AGGR_DIE:
1227                 if (perf_env__build_die_map(env, evsel_list->core.cpus, &stat_config.aggr_map)) {
1228                         perror("cannot build die map");
1229                         return -1;
1230                 }
1231                 stat_config.aggr_get_id = perf_stat__get_die_file;
1232                 break;
1233         case AGGR_CORE:
1234                 if (perf_env__build_core_map(env, evsel_list->core.cpus, &stat_config.aggr_map)) {
1235                         perror("cannot build core map");
1236                         return -1;
1237                 }
1238                 stat_config.aggr_get_id = perf_stat__get_core_file;
1239                 break;
1240         case AGGR_NODE:
1241                 if (perf_env__build_node_map(env, evsel_list->core.cpus, &stat_config.aggr_map)) {
1242                         perror("cannot build core map");
1243                         return -1;
1244                 }
1245                 stat_config.aggr_get_id = perf_stat__get_node_file;
1246                 break;
1247         case AGGR_NONE:
1248         case AGGR_GLOBAL:
1249         case AGGR_THREAD:
1250         case AGGR_UNSET:
1251         default:
1252                 break;
1253         }
1254
1255         return 0;
1256 }
1257
1258 static int topdown_filter_events(const char **attr, char **str, bool use_group)
1259 {
1260         int off = 0;
1261         int i;
1262         int len = 0;
1263         char *s;
1264
1265         for (i = 0; attr[i]; i++) {
1266                 if (pmu_have_event("cpu", attr[i])) {
1267                         len += strlen(attr[i]) + 1;
1268                         attr[i - off] = attr[i];
1269                 } else
1270                         off++;
1271         }
1272         attr[i - off] = NULL;
1273
1274         *str = malloc(len + 1 + 2);
1275         if (!*str)
1276                 return -1;
1277         s = *str;
1278         if (i - off == 0) {
1279                 *s = 0;
1280                 return 0;
1281         }
1282         if (use_group)
1283                 *s++ = '{';
1284         for (i = 0; attr[i]; i++) {
1285                 strcpy(s, attr[i]);
1286                 s += strlen(s);
1287                 *s++ = ',';
1288         }
1289         if (use_group) {
1290                 s[-1] = '}';
1291                 *s = 0;
1292         } else
1293                 s[-1] = 0;
1294         return 0;
1295 }
1296
1297 __weak bool arch_topdown_check_group(bool *warn)
1298 {
1299         *warn = false;
1300         return false;
1301 }
1302
1303 __weak void arch_topdown_group_warn(void)
1304 {
1305 }
1306
1307 /*
1308  * Add default attributes, if there were no attributes specified or
1309  * if -d/--detailed, -d -d or -d -d -d is used:
1310  */
1311 static int add_default_attributes(void)
1312 {
1313         int err;
1314         struct perf_event_attr default_attrs0[] = {
1315
1316   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK              },
1317   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES        },
1318   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS          },
1319   { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS             },
1320
1321   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES              },
1322 };
1323         struct perf_event_attr frontend_attrs[] = {
1324   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },
1325 };
1326         struct perf_event_attr backend_attrs[] = {
1327   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND  },
1328 };
1329         struct perf_event_attr default_attrs1[] = {
1330   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS            },
1331   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS     },
1332   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES           },
1333
1334 };
1335
1336 /*
1337  * Detailed stats (-d), covering the L1 and last level data caches:
1338  */
1339         struct perf_event_attr detailed_attrs[] = {
1340
1341   { .type = PERF_TYPE_HW_CACHE,
1342     .config =
1343          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1344         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1345         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1346
1347   { .type = PERF_TYPE_HW_CACHE,
1348     .config =
1349          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1350         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1351         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1352
1353   { .type = PERF_TYPE_HW_CACHE,
1354     .config =
1355          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1356         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1357         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1358
1359   { .type = PERF_TYPE_HW_CACHE,
1360     .config =
1361          PERF_COUNT_HW_CACHE_LL                 <<  0  |
1362         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1363         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1364 };
1365
1366 /*
1367  * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
1368  */
1369         struct perf_event_attr very_detailed_attrs[] = {
1370
1371   { .type = PERF_TYPE_HW_CACHE,
1372     .config =
1373          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1374         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1375         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1376
1377   { .type = PERF_TYPE_HW_CACHE,
1378     .config =
1379          PERF_COUNT_HW_CACHE_L1I                <<  0  |
1380         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1381         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1382
1383   { .type = PERF_TYPE_HW_CACHE,
1384     .config =
1385          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1386         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1387         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1388
1389   { .type = PERF_TYPE_HW_CACHE,
1390     .config =
1391          PERF_COUNT_HW_CACHE_DTLB               <<  0  |
1392         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1393         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1394
1395   { .type = PERF_TYPE_HW_CACHE,
1396     .config =
1397          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1398         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1399         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1400
1401   { .type = PERF_TYPE_HW_CACHE,
1402     .config =
1403          PERF_COUNT_HW_CACHE_ITLB               <<  0  |
1404         (PERF_COUNT_HW_CACHE_OP_READ            <<  8) |
1405         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1406
1407 };
1408
1409 /*
1410  * Very, very detailed stats (-d -d -d), adding prefetch events:
1411  */
1412         struct perf_event_attr very_very_detailed_attrs[] = {
1413
1414   { .type = PERF_TYPE_HW_CACHE,
1415     .config =
1416          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1417         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1418         (PERF_COUNT_HW_CACHE_RESULT_ACCESS      << 16)                          },
1419
1420   { .type = PERF_TYPE_HW_CACHE,
1421     .config =
1422          PERF_COUNT_HW_CACHE_L1D                <<  0  |
1423         (PERF_COUNT_HW_CACHE_OP_PREFETCH        <<  8) |
1424         (PERF_COUNT_HW_CACHE_RESULT_MISS        << 16)                          },
1425 };
1426         struct parse_events_error errinfo;
1427
1428         /* Set attrs if no event is selected and !null_run: */
1429         if (stat_config.null_run)
1430                 return 0;
1431
1432         bzero(&errinfo, sizeof(errinfo));
1433         if (transaction_run) {
1434                 /* Handle -T as -M transaction. Once platform specific metrics
1435                  * support has been added to the json files, all archictures
1436                  * will use this approach. To determine transaction support
1437                  * on an architecture test for such a metric name.
1438                  */
1439                 if (metricgroup__has_metric("transaction")) {
1440                         struct option opt = { .value = &evsel_list };
1441
1442                         return metricgroup__parse_groups(&opt, "transaction",
1443                                                          &stat_config.metric_events);
1444                 }
1445
1446                 if (pmu_have_event("cpu", "cycles-ct") &&
1447                     pmu_have_event("cpu", "el-start"))
1448                         err = parse_events(evsel_list, transaction_attrs,
1449                                            &errinfo);
1450                 else
1451                         err = parse_events(evsel_list,
1452                                            transaction_limited_attrs,
1453                                            &errinfo);
1454                 if (err) {
1455                         fprintf(stderr, "Cannot set up transaction events\n");
1456                         parse_events_print_error(&errinfo, transaction_attrs);
1457                         return -1;
1458                 }
1459                 return 0;
1460         }
1461
1462         if (smi_cost) {
1463                 int smi;
1464
1465                 if (sysfs__read_int(FREEZE_ON_SMI_PATH, &smi) < 0) {
1466                         fprintf(stderr, "freeze_on_smi is not supported.\n");
1467                         return -1;
1468                 }
1469
1470                 if (!smi) {
1471                         if (sysfs__write_int(FREEZE_ON_SMI_PATH, 1) < 0) {
1472                                 fprintf(stderr, "Failed to set freeze_on_smi.\n");
1473                                 return -1;
1474                         }
1475                         smi_reset = true;
1476                 }
1477
1478                 if (pmu_have_event("msr", "aperf") &&
1479                     pmu_have_event("msr", "smi")) {
1480                         if (!force_metric_only)
1481                                 stat_config.metric_only = true;
1482                         err = parse_events(evsel_list, smi_cost_attrs, &errinfo);
1483                 } else {
1484                         fprintf(stderr, "To measure SMI cost, it needs "
1485                                 "msr/aperf/, msr/smi/ and cpu/cycles/ support\n");
1486                         parse_events_print_error(&errinfo, smi_cost_attrs);
1487                         return -1;
1488                 }
1489                 if (err) {
1490                         parse_events_print_error(&errinfo, smi_cost_attrs);
1491                         fprintf(stderr, "Cannot set up SMI cost events\n");
1492                         return -1;
1493                 }
1494                 return 0;
1495         }
1496
1497         if (topdown_run) {
1498                 char *str = NULL;
1499                 bool warn = false;
1500
1501                 if (stat_config.aggr_mode != AGGR_GLOBAL &&
1502                     stat_config.aggr_mode != AGGR_CORE) {
1503                         pr_err("top down event configuration requires --per-core mode\n");
1504                         return -1;
1505                 }
1506                 stat_config.aggr_mode = AGGR_CORE;
1507                 if (nr_cgroups || !target__has_cpu(&target)) {
1508                         pr_err("top down event configuration requires system-wide mode (-a)\n");
1509                         return -1;
1510                 }
1511
1512                 if (!force_metric_only)
1513                         stat_config.metric_only = true;
1514                 if (topdown_filter_events(topdown_attrs, &str,
1515                                 arch_topdown_check_group(&warn)) < 0) {
1516                         pr_err("Out of memory\n");
1517                         return -1;
1518                 }
1519                 if (topdown_attrs[0] && str) {
1520                         if (warn)
1521                                 arch_topdown_group_warn();
1522                         err = parse_events(evsel_list, str, &errinfo);
1523                         if (err) {
1524                                 fprintf(stderr,
1525                                         "Cannot set up top down events %s: %d\n",
1526                                         str, err);
1527                                 parse_events_print_error(&errinfo, str);
1528                                 free(str);
1529                                 return -1;
1530                         }
1531                 } else {
1532                         fprintf(stderr, "System does not support topdown\n");
1533                         return -1;
1534                 }
1535                 free(str);
1536         }
1537
1538         if (!evsel_list->core.nr_entries) {
1539                 if (target__has_cpu(&target))
1540                         default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
1541
1542                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
1543                         return -1;
1544                 if (pmu_have_event("cpu", "stalled-cycles-frontend")) {
1545                         if (perf_evlist__add_default_attrs(evsel_list,
1546                                                 frontend_attrs) < 0)
1547                                 return -1;
1548                 }
1549                 if (pmu_have_event("cpu", "stalled-cycles-backend")) {
1550                         if (perf_evlist__add_default_attrs(evsel_list,
1551                                                 backend_attrs) < 0)
1552                                 return -1;
1553                 }
1554                 if (perf_evlist__add_default_attrs(evsel_list, default_attrs1) < 0)
1555                         return -1;
1556         }
1557
1558         /* Detailed events get appended to the event list: */
1559
1560         if (detailed_run <  1)
1561                 return 0;
1562
1563         /* Append detailed run extra attributes: */
1564         if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
1565                 return -1;
1566
1567         if (detailed_run < 2)
1568                 return 0;
1569
1570         /* Append very detailed run extra attributes: */
1571         if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
1572                 return -1;
1573
1574         if (detailed_run < 3)
1575                 return 0;
1576
1577         /* Append very, very detailed run extra attributes: */
1578         return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
1579 }
1580
1581 static const char * const stat_record_usage[] = {
1582         "perf stat record [<options>]",
1583         NULL,
1584 };
1585
1586 static void init_features(struct perf_session *session)
1587 {
1588         int feat;
1589
1590         for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1591                 perf_header__set_feat(&session->header, feat);
1592
1593         perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1594         perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1595         perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1596         perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1597         perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1598 }
1599
1600 static int __cmd_record(int argc, const char **argv)
1601 {
1602         struct perf_session *session;
1603         struct perf_data *data = &perf_stat.data;
1604
1605         argc = parse_options(argc, argv, stat_options, stat_record_usage,
1606                              PARSE_OPT_STOP_AT_NON_OPTION);
1607
1608         if (output_name)
1609                 data->path = output_name;
1610
1611         if (stat_config.run_count != 1 || forever) {
1612                 pr_err("Cannot use -r option with perf stat record.\n");
1613                 return -1;
1614         }
1615
1616         session = perf_session__new(data, false, NULL);
1617         if (IS_ERR(session)) {
1618                 pr_err("Perf session creation failed\n");
1619                 return PTR_ERR(session);
1620         }
1621
1622         init_features(session);
1623
1624         session->evlist   = evsel_list;
1625         perf_stat.session = session;
1626         perf_stat.record  = true;
1627         return argc;
1628 }
1629
1630 static int process_stat_round_event(struct perf_session *session,
1631                                     union perf_event *event)
1632 {
1633         struct perf_record_stat_round *stat_round = &event->stat_round;
1634         struct evsel *counter;
1635         struct timespec tsh, *ts = NULL;
1636         const char **argv = session->header.env.cmdline_argv;
1637         int argc = session->header.env.nr_cmdline;
1638
1639         evlist__for_each_entry(evsel_list, counter)
1640                 perf_stat_process_counter(&stat_config, counter);
1641
1642         if (stat_round->type == PERF_STAT_ROUND_TYPE__FINAL)
1643                 update_stats(&walltime_nsecs_stats, stat_round->time);
1644
1645         if (stat_config.interval && stat_round->time) {
1646                 tsh.tv_sec  = stat_round->time / NSEC_PER_SEC;
1647                 tsh.tv_nsec = stat_round->time % NSEC_PER_SEC;
1648                 ts = &tsh;
1649         }
1650
1651         print_counters(ts, argc, argv);
1652         return 0;
1653 }
1654
1655 static
1656 int process_stat_config_event(struct perf_session *session,
1657                               union perf_event *event)
1658 {
1659         struct perf_tool *tool = session->tool;
1660         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1661
1662         perf_event__read_stat_config(&stat_config, &event->stat_config);
1663
1664         if (perf_cpu_map__empty(st->cpus)) {
1665                 if (st->aggr_mode != AGGR_UNSET)
1666                         pr_warning("warning: processing task data, aggregation mode not set\n");
1667                 return 0;
1668         }
1669
1670         if (st->aggr_mode != AGGR_UNSET)
1671                 stat_config.aggr_mode = st->aggr_mode;
1672
1673         if (perf_stat.data.is_pipe)
1674                 perf_stat_init_aggr_mode();
1675         else
1676                 perf_stat_init_aggr_mode_file(st);
1677
1678         return 0;
1679 }
1680
1681 static int set_maps(struct perf_stat *st)
1682 {
1683         if (!st->cpus || !st->threads)
1684                 return 0;
1685
1686         if (WARN_ONCE(st->maps_allocated, "stats double allocation\n"))
1687                 return -EINVAL;
1688
1689         perf_evlist__set_maps(&evsel_list->core, st->cpus, st->threads);
1690
1691         if (perf_evlist__alloc_stats(evsel_list, true))
1692                 return -ENOMEM;
1693
1694         st->maps_allocated = true;
1695         return 0;
1696 }
1697
1698 static
1699 int process_thread_map_event(struct perf_session *session,
1700                              union perf_event *event)
1701 {
1702         struct perf_tool *tool = session->tool;
1703         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1704
1705         if (st->threads) {
1706                 pr_warning("Extra thread map event, ignoring.\n");
1707                 return 0;
1708         }
1709
1710         st->threads = thread_map__new_event(&event->thread_map);
1711         if (!st->threads)
1712                 return -ENOMEM;
1713
1714         return set_maps(st);
1715 }
1716
1717 static
1718 int process_cpu_map_event(struct perf_session *session,
1719                           union perf_event *event)
1720 {
1721         struct perf_tool *tool = session->tool;
1722         struct perf_stat *st = container_of(tool, struct perf_stat, tool);
1723         struct perf_cpu_map *cpus;
1724
1725         if (st->cpus) {
1726                 pr_warning("Extra cpu map event, ignoring.\n");
1727                 return 0;
1728         }
1729
1730         cpus = cpu_map__new_data(&event->cpu_map.data);
1731         if (!cpus)
1732                 return -ENOMEM;
1733
1734         st->cpus = cpus;
1735         return set_maps(st);
1736 }
1737
1738 static int runtime_stat_new(struct perf_stat_config *config, int nthreads)
1739 {
1740         int i;
1741
1742         config->stats = calloc(nthreads, sizeof(struct runtime_stat));
1743         if (!config->stats)
1744                 return -1;
1745
1746         config->stats_num = nthreads;
1747
1748         for (i = 0; i < nthreads; i++)
1749                 runtime_stat__init(&config->stats[i]);
1750
1751         return 0;
1752 }
1753
1754 static void runtime_stat_delete(struct perf_stat_config *config)
1755 {
1756         int i;
1757
1758         if (!config->stats)
1759                 return;
1760
1761         for (i = 0; i < config->stats_num; i++)
1762                 runtime_stat__exit(&config->stats[i]);
1763
1764         zfree(&config->stats);
1765 }
1766
1767 static const char * const stat_report_usage[] = {
1768         "perf stat report [<options>]",
1769         NULL,
1770 };
1771
1772 static struct perf_stat perf_stat = {
1773         .tool = {
1774                 .attr           = perf_event__process_attr,
1775                 .event_update   = perf_event__process_event_update,
1776                 .thread_map     = process_thread_map_event,
1777                 .cpu_map        = process_cpu_map_event,
1778                 .stat_config    = process_stat_config_event,
1779                 .stat           = perf_event__process_stat_event,
1780                 .stat_round     = process_stat_round_event,
1781         },
1782         .aggr_mode = AGGR_UNSET,
1783 };
1784
1785 static int __cmd_report(int argc, const char **argv)
1786 {
1787         struct perf_session *session;
1788         const struct option options[] = {
1789         OPT_STRING('i', "input", &input_name, "file", "input file name"),
1790         OPT_SET_UINT(0, "per-socket", &perf_stat.aggr_mode,
1791                      "aggregate counts per processor socket", AGGR_SOCKET),
1792         OPT_SET_UINT(0, "per-die", &perf_stat.aggr_mode,
1793                      "aggregate counts per processor die", AGGR_DIE),
1794         OPT_SET_UINT(0, "per-core", &perf_stat.aggr_mode,
1795                      "aggregate counts per physical processor core", AGGR_CORE),
1796         OPT_SET_UINT(0, "per-node", &perf_stat.aggr_mode,
1797                      "aggregate counts per numa node", AGGR_NODE),
1798         OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
1799                      "disable CPU count aggregation", AGGR_NONE),
1800         OPT_END()
1801         };
1802         struct stat st;
1803         int ret;
1804
1805         argc = parse_options(argc, argv, options, stat_report_usage, 0);
1806
1807         if (!input_name || !strlen(input_name)) {
1808                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
1809                         input_name = "-";
1810                 else
1811                         input_name = "perf.data";
1812         }
1813
1814         perf_stat.data.path = input_name;
1815         perf_stat.data.mode = PERF_DATA_MODE_READ;
1816
1817         session = perf_session__new(&perf_stat.data, false, &perf_stat.tool);
1818         if (IS_ERR(session))
1819                 return PTR_ERR(session);
1820
1821         perf_stat.session  = session;
1822         stat_config.output = stderr;
1823         evsel_list         = session->evlist;
1824
1825         ret = perf_session__process_events(session);
1826         if (ret)
1827                 return ret;
1828
1829         perf_session__delete(session);
1830         return 0;
1831 }
1832
1833 static void setup_system_wide(int forks)
1834 {
1835         /*
1836          * Make system wide (-a) the default target if
1837          * no target was specified and one of following
1838          * conditions is met:
1839          *
1840          *   - there's no workload specified
1841          *   - there is workload specified but all requested
1842          *     events are system wide events
1843          */
1844         if (!target__none(&target))
1845                 return;
1846
1847         if (!forks)
1848                 target.system_wide = true;
1849         else {
1850                 struct evsel *counter;
1851
1852                 evlist__for_each_entry(evsel_list, counter) {
1853                         if (!counter->core.system_wide)
1854                                 return;
1855                 }
1856
1857                 if (evsel_list->core.nr_entries)
1858                         target.system_wide = true;
1859         }
1860 }
1861
1862 int cmd_stat(int argc, const char **argv)
1863 {
1864         const char * const stat_usage[] = {
1865                 "perf stat [<options>] [<command>]",
1866                 NULL
1867         };
1868         int status = -EINVAL, run_idx;
1869         const char *mode;
1870         FILE *output = stderr;
1871         unsigned int interval, timeout;
1872         const char * const stat_subcommands[] = { "record", "report" };
1873
1874         setlocale(LC_ALL, "");
1875
1876         evsel_list = evlist__new();
1877         if (evsel_list == NULL)
1878                 return -ENOMEM;
1879
1880         parse_events__shrink_config_terms();
1881
1882         /* String-parsing callback-based options would segfault when negated */
1883         set_option_flag(stat_options, 'e', "event", PARSE_OPT_NONEG);
1884         set_option_flag(stat_options, 'M', "metrics", PARSE_OPT_NONEG);
1885         set_option_flag(stat_options, 'G', "cgroup", PARSE_OPT_NONEG);
1886
1887         argc = parse_options_subcommand(argc, argv, stat_options, stat_subcommands,
1888                                         (const char **) stat_usage,
1889                                         PARSE_OPT_STOP_AT_NON_OPTION);
1890         perf_stat__collect_metric_expr(evsel_list);
1891         perf_stat__init_shadow_stats();
1892
1893         if (stat_config.csv_sep) {
1894                 stat_config.csv_output = true;
1895                 if (!strcmp(stat_config.csv_sep, "\\t"))
1896                         stat_config.csv_sep = "\t";
1897         } else
1898                 stat_config.csv_sep = DEFAULT_SEPARATOR;
1899
1900         if (argc && !strncmp(argv[0], "rec", 3)) {
1901                 argc = __cmd_record(argc, argv);
1902                 if (argc < 0)
1903                         return -1;
1904         } else if (argc && !strncmp(argv[0], "rep", 3))
1905                 return __cmd_report(argc, argv);
1906
1907         interval = stat_config.interval;
1908         timeout = stat_config.timeout;
1909
1910         /*
1911          * For record command the -o is already taken care of.
1912          */
1913         if (!STAT_RECORD && output_name && strcmp(output_name, "-"))
1914                 output = NULL;
1915
1916         if (output_name && output_fd) {
1917                 fprintf(stderr, "cannot use both --output and --log-fd\n");
1918                 parse_options_usage(stat_usage, stat_options, "o", 1);
1919                 parse_options_usage(NULL, stat_options, "log-fd", 0);
1920                 goto out;
1921         }
1922
1923         if (stat_config.metric_only && stat_config.aggr_mode == AGGR_THREAD) {
1924                 fprintf(stderr, "--metric-only is not supported with --per-thread\n");
1925                 goto out;
1926         }
1927
1928         if (stat_config.metric_only && stat_config.run_count > 1) {
1929                 fprintf(stderr, "--metric-only is not supported with -r\n");
1930                 goto out;
1931         }
1932
1933         if (stat_config.walltime_run_table && stat_config.run_count <= 1) {
1934                 fprintf(stderr, "--table is only supported with -r\n");
1935                 parse_options_usage(stat_usage, stat_options, "r", 1);
1936                 parse_options_usage(NULL, stat_options, "table", 0);
1937                 goto out;
1938         }
1939
1940         if (output_fd < 0) {
1941                 fprintf(stderr, "argument to --log-fd must be a > 0\n");
1942                 parse_options_usage(stat_usage, stat_options, "log-fd", 0);
1943                 goto out;
1944         }
1945
1946         if (!output) {
1947                 struct timespec tm;
1948                 mode = append_file ? "a" : "w";
1949
1950                 output = fopen(output_name, mode);
1951                 if (!output) {
1952                         perror("failed to create output file");
1953                         return -1;
1954                 }
1955                 clock_gettime(CLOCK_REALTIME, &tm);
1956                 fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
1957         } else if (output_fd > 0) {
1958                 mode = append_file ? "a" : "w";
1959                 output = fdopen(output_fd, mode);
1960                 if (!output) {
1961                         perror("Failed opening logfd");
1962                         return -errno;
1963                 }
1964         }
1965
1966         stat_config.output = output;
1967
1968         /*
1969          * let the spreadsheet do the pretty-printing
1970          */
1971         if (stat_config.csv_output) {
1972                 /* User explicitly passed -B? */
1973                 if (big_num_opt == 1) {
1974                         fprintf(stderr, "-B option not supported with -x\n");
1975                         parse_options_usage(stat_usage, stat_options, "B", 1);
1976                         parse_options_usage(NULL, stat_options, "x", 1);
1977                         goto out;
1978                 } else /* Nope, so disable big number formatting */
1979                         stat_config.big_num = false;
1980         } else if (big_num_opt == 0) /* User passed --no-big-num */
1981                 stat_config.big_num = false;
1982
1983         setup_system_wide(argc);
1984
1985         /*
1986          * Display user/system times only for single
1987          * run and when there's specified tracee.
1988          */
1989         if ((stat_config.run_count == 1) && target__none(&target))
1990                 stat_config.ru_display = true;
1991
1992         if (stat_config.run_count < 0) {
1993                 pr_err("Run count must be a positive number\n");
1994                 parse_options_usage(stat_usage, stat_options, "r", 1);
1995                 goto out;
1996         } else if (stat_config.run_count == 0) {
1997                 forever = true;
1998                 stat_config.run_count = 1;
1999         }
2000
2001         if (stat_config.walltime_run_table) {
2002                 stat_config.walltime_run = zalloc(stat_config.run_count * sizeof(stat_config.walltime_run[0]));
2003                 if (!stat_config.walltime_run) {
2004                         pr_err("failed to setup -r option");
2005                         goto out;
2006                 }
2007         }
2008
2009         if ((stat_config.aggr_mode == AGGR_THREAD) &&
2010                 !target__has_task(&target)) {
2011                 if (!target.system_wide || target.cpu_list) {
2012                         fprintf(stderr, "The --per-thread option is only "
2013                                 "available when monitoring via -p -t -a "
2014                                 "options or only --per-thread.\n");
2015                         parse_options_usage(NULL, stat_options, "p", 1);
2016                         parse_options_usage(NULL, stat_options, "t", 1);
2017                         goto out;
2018                 }
2019         }
2020
2021         /*
2022          * no_aggr, cgroup are for system-wide only
2023          * --per-thread is aggregated per thread, we dont mix it with cpu mode
2024          */
2025         if (((stat_config.aggr_mode != AGGR_GLOBAL &&
2026               stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
2027             !target__has_cpu(&target)) {
2028                 fprintf(stderr, "both cgroup and no-aggregation "
2029                         "modes only available in system-wide mode\n");
2030
2031                 parse_options_usage(stat_usage, stat_options, "G", 1);
2032                 parse_options_usage(NULL, stat_options, "A", 1);
2033                 parse_options_usage(NULL, stat_options, "a", 1);
2034                 goto out;
2035         }
2036
2037         if (add_default_attributes())
2038                 goto out;
2039
2040         target__validate(&target);
2041
2042         if ((stat_config.aggr_mode == AGGR_THREAD) && (target.system_wide))
2043                 target.per_thread = true;
2044
2045         if (perf_evlist__create_maps(evsel_list, &target) < 0) {
2046                 if (target__has_task(&target)) {
2047                         pr_err("Problems finding threads of monitor\n");
2048                         parse_options_usage(stat_usage, stat_options, "p", 1);
2049                         parse_options_usage(NULL, stat_options, "t", 1);
2050                 } else if (target__has_cpu(&target)) {
2051                         perror("failed to parse CPUs map");
2052                         parse_options_usage(stat_usage, stat_options, "C", 1);
2053                         parse_options_usage(NULL, stat_options, "a", 1);
2054                 }
2055                 goto out;
2056         }
2057
2058         /*
2059          * Initialize thread_map with comm names,
2060          * so we could print it out on output.
2061          */
2062         if (stat_config.aggr_mode == AGGR_THREAD) {
2063                 thread_map__read_comms(evsel_list->core.threads);
2064                 if (target.system_wide) {
2065                         if (runtime_stat_new(&stat_config,
2066                                 perf_thread_map__nr(evsel_list->core.threads))) {
2067                                 goto out;
2068                         }
2069                 }
2070         }
2071
2072         if (stat_config.aggr_mode == AGGR_NODE)
2073                 cpu__setup_cpunode_map();
2074
2075         if (stat_config.times && interval)
2076                 interval_count = true;
2077         else if (stat_config.times && !interval) {
2078                 pr_err("interval-count option should be used together with "
2079                                 "interval-print.\n");
2080                 parse_options_usage(stat_usage, stat_options, "interval-count", 0);
2081                 parse_options_usage(stat_usage, stat_options, "I", 1);
2082                 goto out;
2083         }
2084
2085         if (timeout && timeout < 100) {
2086                 if (timeout < 10) {
2087                         pr_err("timeout must be >= 10ms.\n");
2088                         parse_options_usage(stat_usage, stat_options, "timeout", 0);
2089                         goto out;
2090                 } else
2091                         pr_warning("timeout < 100ms. "
2092                                    "The overhead percentage could be high in some cases. "
2093                                    "Please proceed with caution.\n");
2094         }
2095         if (timeout && interval) {
2096                 pr_err("timeout option is not supported with interval-print.\n");
2097                 parse_options_usage(stat_usage, stat_options, "timeout", 0);
2098                 parse_options_usage(stat_usage, stat_options, "I", 1);
2099                 goto out;
2100         }
2101
2102         if (perf_evlist__alloc_stats(evsel_list, interval))
2103                 goto out;
2104
2105         if (perf_stat_init_aggr_mode())
2106                 goto out;
2107
2108         /*
2109          * Set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
2110          * while avoiding that older tools show confusing messages.
2111          *
2112          * However for pipe sessions we need to keep it zero,
2113          * because script's perf_evsel__check_attr is triggered
2114          * by attr->sample_type != 0, and we can't run it on
2115          * stat sessions.
2116          */
2117         stat_config.identifier = !(STAT_RECORD && perf_stat.data.is_pipe);
2118
2119         /*
2120          * We dont want to block the signals - that would cause
2121          * child tasks to inherit that and Ctrl-C would not work.
2122          * What we want is for Ctrl-C to work in the exec()-ed
2123          * task, but being ignored by perf stat itself:
2124          */
2125         atexit(sig_atexit);
2126         if (!forever)
2127                 signal(SIGINT,  skip_signal);
2128         signal(SIGCHLD, skip_signal);
2129         signal(SIGALRM, skip_signal);
2130         signal(SIGABRT, skip_signal);
2131
2132         status = 0;
2133         for (run_idx = 0; forever || run_idx < stat_config.run_count; run_idx++) {
2134                 if (stat_config.run_count != 1 && verbose > 0)
2135                         fprintf(output, "[ perf stat: executing run #%d ... ]\n",
2136                                 run_idx + 1);
2137
2138                 if (run_idx != 0)
2139                         perf_evlist__reset_prev_raw_counts(evsel_list);
2140
2141                 status = run_perf_stat(argc, argv, run_idx);
2142                 if (forever && status != -1 && !interval) {
2143                         print_counters(NULL, argc, argv);
2144                         perf_stat__reset_stats();
2145                 }
2146         }
2147
2148         if (!forever && status != -1 && !interval)
2149                 print_counters(NULL, argc, argv);
2150
2151         if (STAT_RECORD) {
2152                 /*
2153                  * We synthesize the kernel mmap record just so that older tools
2154                  * don't emit warnings about not being able to resolve symbols
2155                  * due to /proc/sys/kernel/kptr_restrict settings and instear provide
2156                  * a saner message about no samples being in the perf.data file.
2157                  *
2158                  * This also serves to suppress a warning about f_header.data.size == 0
2159                  * in header.c at the moment 'perf stat record' gets introduced, which
2160                  * is not really needed once we start adding the stat specific PERF_RECORD_
2161                  * records, but the need to suppress the kptr_restrict messages in older
2162                  * tools remain  -acme
2163                  */
2164                 int fd = perf_data__fd(&perf_stat.data);
2165                 int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
2166                                                              process_synthesized_event,
2167                                                              &perf_stat.session->machines.host);
2168                 if (err) {
2169                         pr_warning("Couldn't synthesize the kernel mmap record, harmless, "
2170                                    "older tools may produce warnings about this file\n.");
2171                 }
2172
2173                 if (!interval) {
2174                         if (WRITE_STAT_ROUND_EVENT(walltime_nsecs_stats.max, FINAL))
2175                                 pr_err("failed to write stat round event\n");
2176                 }
2177
2178                 if (!perf_stat.data.is_pipe) {
2179                         perf_stat.session->header.data_size += perf_stat.bytes_written;
2180                         perf_session__write_header(perf_stat.session, evsel_list, fd, true);
2181                 }
2182
2183                 evlist__close(evsel_list);
2184                 perf_session__delete(perf_stat.session);
2185         }
2186
2187         perf_stat__exit_aggr_mode();
2188         perf_evlist__free_stats(evsel_list);
2189 out:
2190         zfree(&stat_config.walltime_run);
2191
2192         if (smi_cost && smi_reset)
2193                 sysfs__write_int(FREEZE_ON_SMI_PATH, 0);
2194
2195         evlist__delete(evsel_list);
2196
2197         runtime_stat_delete(&stat_config);
2198
2199         return status;
2200 }