tools/perf/builtin-trace.c

   1 #include "builtin.h"
   2 #include "util/color.h"
   3 #include "util/evlist.h"
   4 #include "util/machine.h"
   5 #include "util/thread.h"
   6 #include "util/parse-options.h"
   7 #include "util/thread_map.h"
   8 #include "event-parse.h"
   9
  10 #include <libaudit.h>
  11 #include <stdlib.h>
  12
  13 static struct syscall_fmt {
  14         const char *name;
  15         const char *alias;
  16         bool       errmsg;
  17         bool       timeout;
  18 } syscall_fmts[] = {
  19         { .name     = "access",     .errmsg = true, },
  20         { .name     = "arch_prctl", .errmsg = true, .alias = "prctl", },
  21         { .name     = "fstat",      .errmsg = true, .alias = "newfstat", },
  22         { .name     = "fstatat",    .errmsg = true, .alias = "newfstatat", },
  23         { .name     = "futex",      .errmsg = true, },
  24         { .name     = "open",       .errmsg = true, },
  25         { .name     = "poll",       .errmsg = true, .timeout = true, },
  26         { .name     = "ppoll",      .errmsg = true, .timeout = true, },
  27         { .name     = "read",       .errmsg = true, },
  28         { .name     = "recvfrom",   .errmsg = true, },
  29         { .name     = "select",     .errmsg = true, .timeout = true, },
  30         { .name     = "socket",     .errmsg = true, },
  31         { .name     = "stat",       .errmsg = true, .alias = "newstat", },
  32 };
  33
  34 static int syscall_fmt__cmp(const void *name, const void *fmtp)
  35 {
  36         const struct syscall_fmt *fmt = fmtp;
  37         return strcmp(name, fmt->name);
  38 }
  39
  40 static struct syscall_fmt *syscall_fmt__find(const char *name)
  41 {
  42         const int nmemb = ARRAY_SIZE(syscall_fmts);
  43         return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
  44 }
  45
  46 struct syscall {
  47         struct event_format *tp_format;
  48         const char          *name;
  49         struct syscall_fmt  *fmt;
  50 };
  51
  52 static size_t fprintf_duration(unsigned long t, FILE *fp)
  53 {
  54         double duration = (double)t / NSEC_PER_MSEC;
  55         size_t printed = fprintf(fp, "(");
  56
  57         if (duration >= 1.0)
  58                 printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);
  59         else if (duration >= 0.01)
  60                 printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);
  61         else
  62                 printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);
  63         return printed + fprintf(stdout, "): ");
  64 }
  65
  66 struct thread_trace {
  67         u64               entry_time;
  68         u64               exit_time;
  69         bool              entry_pending;
  70         unsigned long     nr_events;
  71         char              *entry_str;
  72         double            runtime_ms;
  73 };
  74
  75 static struct thread_trace *thread_trace__new(void)
  76 {
  77         return zalloc(sizeof(struct thread_trace));
  78 }
  79
  80 static struct thread_trace *thread__trace(struct thread *thread)
  81 {
  82         struct thread_trace *ttrace;
  83
  84         if (thread == NULL)
  85                 goto fail;
  86
  87         if (thread->priv == NULL)
  88                 thread->priv = thread_trace__new();
  89
  90         if (thread->priv == NULL)
  91                 goto fail;
  92
  93         ttrace = thread->priv;
  94         ++ttrace->nr_events;
  95
  96         return ttrace;
  97 fail:
  98         color_fprintf(stdout, PERF_COLOR_RED,
  99                       "WARNING: not enough memory, dropping samples!\n");
 100         return NULL;
 101 }
 102
 103 struct trace {
 104         int                     audit_machine;
 105         struct {
 106                 int             max;
 107                 struct syscall  *table;
 108         } syscalls;
 109         struct perf_record_opts opts;
 110         struct machine          host;
 111         u64                     base_time;
 112         unsigned long           nr_events;
 113         bool                    sched;
 114         bool                    multiple_threads;
 115         double                  duration_filter;
 116         double                  runtime_ms;
 117 };
 118
 119 static bool trace__filter_duration(struct trace *trace, double t)
 120 {
 121         return t < (trace->duration_filter * NSEC_PER_MSEC);
 122 }
 123
 124 static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
 125 {
 126         double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
 127
 128         return fprintf(fp, "%10.3f ", ts);
 129 }
 130
 131 static bool done = false;
 132
 133 static void sig_handler(int sig __maybe_unused)
 134 {
 135         done = true;
 136 }
 137
 138 static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
 139                                         u64 duration, u64 tstamp, FILE *fp)
 140 {
 141         size_t printed = trace__fprintf_tstamp(trace, tstamp, fp);
 142         printed += fprintf_duration(duration, fp);
 143
 144         if (trace->multiple_threads)
 145                 printed += fprintf(fp, "%d ", thread->pid);
 146
 147         return printed;
 148 }
 149
 150 static int trace__process_event(struct machine *machine, union perf_event *event)
 151 {
 152         int ret = 0;
 153
 154         switch (event->header.type) {
 155         case PERF_RECORD_LOST:
 156                 color_fprintf(stdout, PERF_COLOR_RED,
 157                               "LOST %" PRIu64 " events!\n", event->lost.lost);
 158                 ret = machine__process_lost_event(machine, event);
 159         default:
 160                 ret = machine__process_event(machine, event);
 161                 break;
 162         }
 163
 164         return ret;
 165 }
 166
 167 static int trace__tool_process(struct perf_tool *tool __maybe_unused,
 168                                union perf_event *event,
 169                                struct perf_sample *sample __maybe_unused,
 170                                struct machine *machine)
 171 {
 172         return trace__process_event(machine, event);
 173 }
 174
 175 static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 176 {
 177         int err = symbol__init();
 178
 179         if (err)
 180                 return err;
 181
 182         machine__init(&trace->host, "", HOST_KERNEL_ID);
 183         machine__create_kernel_maps(&trace->host);
 184
 185         if (perf_target__has_task(&trace->opts.target)) {
 186                 err = perf_event__synthesize_thread_map(NULL, evlist->threads,
 187                                                         trace__tool_process,
 188                                                         &trace->host);
 189         } else {
 190                 err = perf_event__synthesize_threads(NULL, trace__tool_process,
 191                                                      &trace->host);
 192         }
 193
 194         if (err)
 195                 symbol__exit();
 196
 197         return err;
 198 }
 199
 200 static int trace__read_syscall_info(struct trace *trace, int id)
 201 {
 202         char tp_name[128];
 203         struct syscall *sc;
 204         const char *name = audit_syscall_to_name(id, trace->audit_machine);
 205
 206         if (name == NULL)
 207                 return -1;
 208
 209         if (id > trace->syscalls.max) {
 210                 struct syscall *nsyscalls = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));
 211
 212                 if (nsyscalls == NULL)
 213                         return -1;
 214
 215                 if (trace->syscalls.max != -1) {
 216                         memset(nsyscalls + trace->syscalls.max + 1, 0,
 217                                (id - trace->syscalls.max) * sizeof(*sc));
 218                 } else {
 219                         memset(nsyscalls, 0, (id + 1) * sizeof(*sc));
 220                 }
 221
 222                 trace->syscalls.table = nsyscalls;
 223                 trace->syscalls.max   = id;
 224         }
 225
 226         sc = trace->syscalls.table + id;
 227         sc->name = name;
 228         sc->fmt  = syscall_fmt__find(sc->name);
 229
 230         snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
 231         sc->tp_format = event_format__new("syscalls", tp_name);
 232
 233         if (sc->tp_format == NULL && sc->fmt && sc->fmt->alias) {
 234                 snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
 235                 sc->tp_format = event_format__new("syscalls", tp_name);
 236         }
 237
 238         return sc->tp_format != NULL ? 0 : -1;
 239 }
 240
 241 static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
 242                                       unsigned long *args)
 243 {
 244         int i = 0;
 245         size_t printed = 0;
 246
 247         if (sc->tp_format != NULL) {
 248                 struct format_field *field;
 249
 250                 for (field = sc->tp_format->format.fields->next; field; field = field->next) {
 251                         printed += scnprintf(bf + printed, size - printed,
 252                                              "%s%s: %ld", printed ? ", " : "",
 253                                              field->name, args[i++]);
 254                 }
 255         } else {
 256                 while (i < 6) {
 257                         printed += scnprintf(bf + printed, size - printed,
 258                                              "%sarg%d: %ld",
 259                                              printed ? ", " : "", i, args[i]);
 260                         ++i;
 261                 }
 262         }
 263
 264         return printed;
 265 }
 266
 267 typedef int (*tracepoint_handler)(struct trace *trace, struct perf_evsel *evsel,
 268                                   struct perf_sample *sample);
 269
 270 static struct syscall *trace__syscall_info(struct trace *trace,
 271                                            struct perf_evsel *evsel,
 272                                            struct perf_sample *sample)
 273 {
 274         int id = perf_evsel__intval(evsel, sample, "id");
 275
 276         if (id < 0) {
 277                 printf("Invalid syscall %d id, skipping...\n", id);
 278                 return NULL;
 279         }
 280
 281         if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL) &&
 282             trace__read_syscall_info(trace, id))
 283                 goto out_cant_read;
 284
 285         if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL))
 286                 goto out_cant_read;
 287
 288         return &trace->syscalls.table[id];
 289
 290 out_cant_read:
 291         printf("Problems reading syscall %d", id);
 292         if (id <= trace->syscalls.max && trace->syscalls.table[id].name != NULL)
 293                 printf("(%s)", trace->syscalls.table[id].name);
 294         puts(" information");
 295         return NULL;
 296 }
 297
 298 static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
 299                             struct perf_sample *sample)
 300 {
 301         char *msg;
 302         void *args;
 303         size_t printed = 0;
 304         struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
 305         struct syscall *sc = trace__syscall_info(trace, evsel, sample);
 306         struct thread_trace *ttrace = thread__trace(thread);
 307
 308         if (ttrace == NULL || sc == NULL)
 309                 return -1;
 310
 311         args = perf_evsel__rawptr(evsel, sample, "args");
 312         if (args == NULL) {
 313                 printf("Problems reading syscall arguments\n");
 314                 return -1;
 315         }
 316
 317         ttrace = thread->priv;
 318
 319         if (ttrace->entry_str == NULL) {
 320                 ttrace->entry_str = malloc(1024);
 321                 if (!ttrace->entry_str)
 322                         return -1;
 323         }
 324
 325         ttrace->entry_time = sample->time;
 326         msg = ttrace->entry_str;
 327         printed += scnprintf(msg + printed, 1024 - printed, "%s(", sc->name);
 328
 329         printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed,  args);
 330
 331         if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
 332                 if (!trace->duration_filter) {
 333                         trace__fprintf_entry_head(trace, thread, 1, sample->time, stdout);
 334                         printf("%-70s\n", ttrace->entry_str);
 335                 }
 336         } else
 337                 ttrace->entry_pending = true;
 338
 339         return 0;
 340 }
 341
 342 static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
 343                            struct perf_sample *sample)
 344 {
 345         int ret;
 346         u64 duration = 0;
 347         struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
 348         struct thread_trace *ttrace = thread__trace(thread);
 349         struct syscall *sc = trace__syscall_info(trace, evsel, sample);
 350
 351         if (ttrace == NULL || sc == NULL)
 352                 return -1;
 353
 354         ret = perf_evsel__intval(evsel, sample, "ret");
 355
 356         ttrace = thread->priv;
 357
 358         ttrace->exit_time = sample->time;
 359
 360         if (ttrace->entry_time) {
 361                 duration = sample->time - ttrace->entry_time;
 362                 if (trace__filter_duration(trace, duration))
 363                         goto out;
 364         } else if (trace->duration_filter)
 365                 goto out;
 366
 367         trace__fprintf_entry_head(trace, thread, duration, sample->time, stdout);
 368
 369         if (ttrace->entry_pending) {
 370                 printf("%-70s", ttrace->entry_str);
 371         } else {
 372                 printf(" ... [");
 373                 color_fprintf(stdout, PERF_COLOR_YELLOW, "continued");
 374                 printf("]: %s()", sc->name);
 375         }
 376
 377         if (ret < 0 && sc->fmt && sc->fmt->errmsg) {
 378                 char bf[256];
 379                 const char *emsg = strerror_r(-ret, bf, sizeof(bf)),
 380                            *e = audit_errno_to_name(-ret);
 381
 382                 printf(") = -1 %s %s", e, emsg);
 383         } else if (ret == 0 && sc->fmt && sc->fmt->timeout)
 384                 printf(") = 0 Timeout");
 385         else
 386                 printf(") = %d", ret);
 387
 388         putchar('\n');
 389 out:
 390         ttrace->entry_pending = false;
 391
 392         return 0;
 393 }
 394
 395 static int trace__sched_stat_runtime(struct trace *trace, struct perf_evsel *evsel,
 396                                      struct perf_sample *sample)
 397 {
 398         u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
 399         double runtime_ms = (double)runtime / NSEC_PER_MSEC;
 400         struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
 401         struct thread_trace *ttrace = thread__trace(thread);
 402
 403         if (ttrace == NULL)
 404                 goto out_dump;
 405
 406         ttrace->runtime_ms += runtime_ms;
 407         trace->runtime_ms += runtime_ms;
 408         return 0;
 409
 410 out_dump:
 411         printf("%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
 412                evsel->name,
 413                perf_evsel__strval(evsel, sample, "comm"),
 414                (pid_t)perf_evsel__intval(evsel, sample, "pid"),
 415                runtime,
 416                perf_evsel__intval(evsel, sample, "vruntime"));
 417         return 0;
 418 }
 419
 420 static int trace__run(struct trace *trace, int argc, const char **argv)
 421 {
 422         struct perf_evlist *evlist = perf_evlist__new(NULL, NULL);
 423         struct perf_evsel *evsel;
 424         int err = -1, i;
 425         unsigned long before;
 426         const bool forks = argc > 0;
 427
 428         if (evlist == NULL) {
 429                 printf("Not enough memory to run!\n");
 430                 goto out;
 431         }
 432
 433         if (perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_enter", trace__sys_enter) ||
 434             perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit", trace__sys_exit)) {
 435                 printf("Couldn't read the raw_syscalls tracepoints information!\n");
 436                 goto out_delete_evlist;
 437         }
 438
 439         if (trace->sched &&
 440             perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
 441                                    trace__sched_stat_runtime)) {
 442                 printf("Couldn't read the sched_stat_runtime tracepoint information!\n");
 443                 goto out_delete_evlist;
 444         }
 445
 446         err = perf_evlist__create_maps(evlist, &trace->opts.target);
 447         if (err < 0) {
 448                 printf("Problems parsing the target to trace, check your options!\n");
 449                 goto out_delete_evlist;
 450         }
 451
 452         err = trace__symbols_init(trace, evlist);
 453         if (err < 0) {
 454                 printf("Problems initializing symbol libraries!\n");
 455                 goto out_delete_evlist;
 456         }
 457
 458         perf_evlist__config_attrs(evlist, &trace->opts);
 459
 460         signal(SIGCHLD, sig_handler);
 461         signal(SIGINT, sig_handler);
 462
 463         if (forks) {
 464                 err = perf_evlist__prepare_workload(evlist, &trace->opts, argv);
 465                 if (err < 0) {
 466                         printf("Couldn't run the workload!\n");
 467                         goto out_delete_evlist;
 468                 }
 469         }
 470
 471         err = perf_evlist__open(evlist);
 472         if (err < 0) {
 473                 printf("Couldn't create the events: %s\n", strerror(errno));
 474                 goto out_delete_evlist;
 475         }
 476
 477         err = perf_evlist__mmap(evlist, UINT_MAX, false);
 478         if (err < 0) {
 479                 printf("Couldn't mmap the events: %s\n", strerror(errno));
 480                 goto out_delete_evlist;
 481         }
 482
 483         perf_evlist__enable(evlist);
 484
 485         if (forks)
 486                 perf_evlist__start_workload(evlist);
 487
 488         trace->multiple_threads = evlist->threads->map[0] == -1 || evlist->threads->nr > 1;
 489 again:
 490         before = trace->nr_events;
 491
 492         for (i = 0; i < evlist->nr_mmaps; i++) {
 493                 union perf_event *event;
 494
 495                 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 496                         const u32 type = event->header.type;
 497                         tracepoint_handler handler;
 498                         struct perf_sample sample;
 499
 500                         ++trace->nr_events;
 501
 502                         err = perf_evlist__parse_sample(evlist, event, &sample);
 503                         if (err) {
 504                                 printf("Can't parse sample, err = %d, skipping...\n", err);
 505                                 continue;
 506                         }
 507
 508                         if (trace->base_time == 0)
 509                                 trace->base_time = sample.time;
 510
 511                         if (type != PERF_RECORD_SAMPLE) {
 512                                 trace__process_event(&trace->host, event);
 513                                 continue;
 514                         }
 515
 516                         evsel = perf_evlist__id2evsel(evlist, sample.id);
 517                         if (evsel == NULL) {
 518                                 printf("Unknown tp ID %" PRIu64 ", skipping...\n", sample.id);
 519                                 continue;
 520                         }
 521
 522                         if (sample.raw_data == NULL) {
 523                                 printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
 524                                        perf_evsel__name(evsel), sample.tid,
 525                                        sample.cpu, sample.raw_size);
 526                                 continue;
 527                         }
 528
 529                         if (sample.raw_data == NULL) {
 530                                 printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
 531                                        perf_evsel__name(evsel), sample.tid,
 532                                        sample.cpu, sample.raw_size);
 533                                 continue;
 534                         }
 535
 536                         handler = evsel->handler.func;
 537                         handler(trace, evsel, &sample);
 538                 }
 539         }
 540
 541         if (trace->nr_events == before) {
 542                 if (done)
 543                         goto out_delete_evlist;
 544
 545                 poll(evlist->pollfd, evlist->nr_fds, -1);
 546         }
 547
 548         if (done)
 549                 perf_evlist__disable(evlist);
 550
 551         goto again;
 552
 553 out_delete_evlist:
 554         perf_evlist__delete(evlist);
 555 out:
 556         return err;
 557 }
 558
 559 static size_t trace__fprintf_threads_header(FILE *fp)
 560 {
 561         size_t printed;
 562
 563         printed  = fprintf(fp, "\n _____________________________________________________________________\n");
 564         printed += fprintf(fp," __)    Summary of events    (__\n\n");
 565         printed += fprintf(fp,"              [ task - pid ]     [ events ] [ ratio ]  [ runtime ]\n");
 566         printed += fprintf(fp," _____________________________________________________________________\n\n");
 567
 568         return printed;
 569 }
 570
 571 static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
 572 {
 573         size_t printed = trace__fprintf_threads_header(fp);
 574         struct rb_node *nd;
 575
 576         for (nd = rb_first(&trace->host.threads); nd; nd = rb_next(nd)) {
 577                 struct thread *thread = rb_entry(nd, struct thread, rb_node);
 578                 struct thread_trace *ttrace = thread->priv;
 579                 const char *color;
 580                 double ratio;
 581
 582                 if (ttrace == NULL)
 583                         continue;
 584
 585                 ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
 586
 587                 color = PERF_COLOR_NORMAL;
 588                 if (ratio > 50.0)
 589                         color = PERF_COLOR_RED;
 590                 else if (ratio > 25.0)
 591                         color = PERF_COLOR_GREEN;
 592                 else if (ratio > 5.0)
 593                         color = PERF_COLOR_YELLOW;
 594
 595                 printed += color_fprintf(fp, color, "%20s", thread->comm);
 596                 printed += fprintf(fp, " - %-5d :%11lu   [", thread->pid, ttrace->nr_events);
 597                 printed += color_fprintf(fp, color, "%5.1f%%", ratio);
 598                 printed += fprintf(fp, " ] %10.3f ms\n", ttrace->runtime_ms);
 599         }
 600
 601         return printed;
 602 }
 603
 604 static int trace__set_duration(const struct option *opt, const char *str,
 605                                int unset __maybe_unused)
 606 {
 607         struct trace *trace = opt->value;
 608
 609         trace->duration_filter = atof(str);
 610         return 0;
 611 }
 612
 613 int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 614 {
 615         const char * const trace_usage[] = {
 616                 "perf trace [<options>] [<command>]",
 617                 "perf trace [<options>] -- <command> [<options>]",
 618                 NULL
 619         };
 620         struct trace trace = {
 621                 .audit_machine = audit_detect_machine(),
 622                 .syscalls = {
 623                         . max = -1,
 624                 },
 625                 .opts = {
 626                         .target = {
 627                                 .uid       = UINT_MAX,
 628                                 .uses_mmap = true,
 629                         },
 630                         .user_freq     = UINT_MAX,
 631                         .user_interval = ULLONG_MAX,
 632                         .no_delay      = true,
 633                         .mmap_pages    = 1024,
 634                 },
 635         };
 636         const struct option trace_options[] = {
 637         OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
 638                     "trace events on existing process id"),
 639         OPT_STRING(0, "tid", &trace.opts.target.tid, "tid",
 640                     "trace events on existing thread id"),
 641         OPT_BOOLEAN(0, "all-cpus", &trace.opts.target.system_wide,
 642                     "system-wide collection from all CPUs"),
 643         OPT_STRING(0, "cpu", &trace.opts.target.cpu_list, "cpu",
 644                     "list of cpus to monitor"),
 645         OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
 646                     "child tasks do not inherit counters"),
 647         OPT_UINTEGER(0, "mmap-pages", &trace.opts.mmap_pages,
 648                      "number of mmap data pages"),
 649         OPT_STRING(0, "uid", &trace.opts.target.uid_str, "user",
 650                    "user to profile"),
 651         OPT_CALLBACK(0, "duration", &trace, "float",
 652                      "show only events with duration > N.M ms",
 653                      trace__set_duration),
 654         OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
 655         OPT_END()
 656         };
 657         int err;
 658         char bf[BUFSIZ];
 659
 660         argc = parse_options(argc, argv, trace_options, trace_usage, 0);
 661
 662         err = perf_target__validate(&trace.opts.target);
 663         if (err) {
 664                 perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
 665                 printf("%s", bf);
 666                 return err;
 667         }
 668
 669         err = perf_target__parse_uid(&trace.opts.target);
 670         if (err) {
 671                 perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
 672                 printf("%s", bf);
 673                 return err;
 674         }
 675
 676         if (!argc && perf_target__none(&trace.opts.target))
 677                 trace.opts.target.system_wide = true;
 678
 679         err = trace__run(&trace, argc, argv);
 680
 681         if (trace.sched && !err)
 682                 trace__fprintf_thread_summary(&trace, stdout);
 683
 684         return err;
 685 }