Pileus Git - ~andy/linux/blob - tools/perf/builtin-trace.c

   1 #include <traceevent/event-parse.h>
   2 #include "builtin.h"
   3 #include "util/color.h"
   4 #include "util/evlist.h"
   5 #include "util/machine.h"
   6 #include "util/thread.h"
   7 #include "util/parse-options.h"
   8 #include "util/strlist.h"
   9 #include "util/thread_map.h"
  10
  11 #include <libaudit.h>
  12 #include <stdlib.h>
  13
  14 static struct syscall_fmt {
  15         const char *name;
  16         const char *alias;
  17         bool       errmsg;
  18         bool       timeout;
  19 } syscall_fmts[] = {
  20         { .name     = "access",     .errmsg = true, },
  21         { .name     = "arch_prctl", .errmsg = true, .alias = "prctl", },
  22         { .name     = "connect",    .errmsg = true, },
  23         { .name     = "fstat",      .errmsg = true, .alias = "newfstat", },
  24         { .name     = "fstatat",    .errmsg = true, .alias = "newfstatat", },
  25         { .name     = "futex",      .errmsg = true, },
  26         { .name     = "open",       .errmsg = true, },
  27         { .name     = "poll",       .errmsg = true, .timeout = true, },
  28         { .name     = "ppoll",      .errmsg = true, .timeout = true, },
  29         { .name     = "read",       .errmsg = true, },
  30         { .name     = "recvfrom",   .errmsg = true, },
  31         { .name     = "select",     .errmsg = true, .timeout = true, },
  32         { .name     = "socket",     .errmsg = true, },
  33         { .name     = "stat",       .errmsg = true, .alias = "newstat", },
  34 };
  35
  36 static int syscall_fmt__cmp(const void *name, const void *fmtp)
  37 {
  38         const struct syscall_fmt *fmt = fmtp;
  39         return strcmp(name, fmt->name);
  40 }
  41
  42 static struct syscall_fmt *syscall_fmt__find(const char *name)
  43 {
  44         const int nmemb = ARRAY_SIZE(syscall_fmts);
  45         return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
  46 }
  47
  48 struct syscall {
  49         struct event_format *tp_format;
  50         const char          *name;
  51         bool                filtered;
  52         struct syscall_fmt  *fmt;
  53 };
  54
  55 static size_t fprintf_duration(unsigned long t, FILE *fp)
  56 {
  57         double duration = (double)t / NSEC_PER_MSEC;
  58         size_t printed = fprintf(fp, "(");
  59
  60         if (duration >= 1.0)
  61                 printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);
  62         else if (duration >= 0.01)
  63                 printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);
  64         else
  65                 printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);
  66         return printed + fprintf(stdout, "): ");
  67 }
  68
  69 struct thread_trace {
  70         u64               entry_time;
  71         u64               exit_time;
  72         bool              entry_pending;
  73         unsigned long     nr_events;
  74         char              *entry_str;
  75         double            runtime_ms;
  76 };
  77
  78 static struct thread_trace *thread_trace__new(void)
  79 {
  80         return zalloc(sizeof(struct thread_trace));
  81 }
  82
  83 static struct thread_trace *thread__trace(struct thread *thread)
  84 {
  85         struct thread_trace *ttrace;
  86
  87         if (thread == NULL)
  88                 goto fail;
  89
  90         if (thread->priv == NULL)
  91                 thread->priv = thread_trace__new();
  92
  93         if (thread->priv == NULL)
  94                 goto fail;
  95
  96         ttrace = thread->priv;
  97         ++ttrace->nr_events;
  98
  99         return ttrace;
 100 fail:
 101         color_fprintf(stdout, PERF_COLOR_RED,
 102                       "WARNING: not enough memory, dropping samples!\n");
 103         return NULL;
 104 }
 105
 106 struct trace {
 107         int                     audit_machine;
 108         struct {
 109                 int             max;
 110                 struct syscall  *table;
 111         } syscalls;
 112         struct perf_record_opts opts;
 113         struct machine          host;
 114         u64                     base_time;
 115         struct strlist          *ev_qualifier;
 116         unsigned long           nr_events;
 117         bool                    sched;
 118         bool                    multiple_threads;
 119         double                  duration_filter;
 120         double                  runtime_ms;
 121 };
 122
 123 static bool trace__filter_duration(struct trace *trace, double t)
 124 {
 125         return t < (trace->duration_filter * NSEC_PER_MSEC);
 126 }
 127
 128 static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
 129 {
 130         double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
 131
 132         return fprintf(fp, "%10.3f ", ts);
 133 }
 134
 135 static bool done = false;
 136
 137 static void sig_handler(int sig __maybe_unused)
 138 {
 139         done = true;
 140 }
 141
 142 static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
 143                                         u64 duration, u64 tstamp, FILE *fp)
 144 {
 145         size_t printed = trace__fprintf_tstamp(trace, tstamp, fp);
 146         printed += fprintf_duration(duration, fp);
 147
 148         if (trace->multiple_threads)
 149                 printed += fprintf(fp, "%d ", thread->tid);
 150
 151         return printed;
 152 }
 153
 154 static int trace__process_event(struct machine *machine, union perf_event *event)
 155 {
 156         int ret = 0;
 157
 158         switch (event->header.type) {
 159         case PERF_RECORD_LOST:
 160                 color_fprintf(stdout, PERF_COLOR_RED,
 161                               "LOST %" PRIu64 " events!\n", event->lost.lost);
 162                 ret = machine__process_lost_event(machine, event);
 163         default:
 164                 ret = machine__process_event(machine, event);
 165                 break;
 166         }
 167
 168         return ret;
 169 }
 170
 171 static int trace__tool_process(struct perf_tool *tool __maybe_unused,
 172                                union perf_event *event,
 173                                struct perf_sample *sample __maybe_unused,
 174                                struct machine *machine)
 175 {
 176         return trace__process_event(machine, event);
 177 }
 178
 179 static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
 180 {
 181         int err = symbol__init();
 182
 183         if (err)
 184                 return err;
 185
 186         machine__init(&trace->host, "", HOST_KERNEL_ID);
 187         machine__create_kernel_maps(&trace->host);
 188
 189         if (perf_target__has_task(&trace->opts.target)) {
 190                 err = perf_event__synthesize_thread_map(NULL, evlist->threads,
 191                                                         trace__tool_process,
 192                                                         &trace->host);
 193         } else {
 194                 err = perf_event__synthesize_threads(NULL, trace__tool_process,
 195                                                      &trace->host);
 196         }
 197
 198         if (err)
 199                 symbol__exit();
 200
 201         return err;
 202 }
 203
 204 static int trace__read_syscall_info(struct trace *trace, int id)
 205 {
 206         char tp_name[128];
 207         struct syscall *sc;
 208         const char *name = audit_syscall_to_name(id, trace->audit_machine);
 209
 210         if (name == NULL)
 211                 return -1;
 212
 213         if (id > trace->syscalls.max) {
 214                 struct syscall *nsyscalls = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));
 215
 216                 if (nsyscalls == NULL)
 217                         return -1;
 218
 219                 if (trace->syscalls.max != -1) {
 220                         memset(nsyscalls + trace->syscalls.max + 1, 0,
 221                                (id - trace->syscalls.max) * sizeof(*sc));
 222                 } else {
 223                         memset(nsyscalls, 0, (id + 1) * sizeof(*sc));
 224                 }
 225
 226                 trace->syscalls.table = nsyscalls;
 227                 trace->syscalls.max   = id;
 228         }
 229
 230         sc = trace->syscalls.table + id;
 231         sc->name = name;
 232
 233         if (trace->ev_qualifier && !strlist__find(trace->ev_qualifier, name)) {
 234                 sc->filtered = true;
 235                 /*
 236                  * No need to do read tracepoint information since this will be
 237                  * filtered out.
 238                  */
 239                 return 0;
 240         }
 241
 242         sc->fmt  = syscall_fmt__find(sc->name);
 243
 244         snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
 245         sc->tp_format = event_format__new("syscalls", tp_name);
 246
 247         if (sc->tp_format == NULL && sc->fmt && sc->fmt->alias) {
 248                 snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
 249                 sc->tp_format = event_format__new("syscalls", tp_name);
 250         }
 251
 252         return sc->tp_format != NULL ? 0 : -1;
 253 }
 254
 255 static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
 256                                       unsigned long *args)
 257 {
 258         int i = 0;
 259         size_t printed = 0;
 260
 261         if (sc->tp_format != NULL) {
 262                 struct format_field *field;
 263
 264                 for (field = sc->tp_format->format.fields->next; field; field = field->next) {
 265                         printed += scnprintf(bf + printed, size - printed,
 266                                              "%s%s: %ld", printed ? ", " : "",
 267                                              field->name, args[i++]);
 268                 }
 269         } else {
 270                 while (i < 6) {
 271                         printed += scnprintf(bf + printed, size - printed,
 272                                              "%sarg%d: %ld",
 273                                              printed ? ", " : "", i, args[i]);
 274                         ++i;
 275                 }
 276         }
 277
 278         return printed;
 279 }
 280
 281 typedef int (*tracepoint_handler)(struct trace *trace, struct perf_evsel *evsel,
 282                                   struct perf_sample *sample);
 283
 284 static struct syscall *trace__syscall_info(struct trace *trace,
 285                                            struct perf_evsel *evsel,
 286                                            struct perf_sample *sample)
 287 {
 288         int id = perf_evsel__intval(evsel, sample, "id");
 289
 290         if (id < 0) {
 291                 printf("Invalid syscall %d id, skipping...\n", id);
 292                 return NULL;
 293         }
 294
 295         if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL) &&
 296             trace__read_syscall_info(trace, id))
 297                 goto out_cant_read;
 298
 299         if ((id > trace->syscalls.max || trace->syscalls.table[id].name == NULL))
 300                 goto out_cant_read;
 301
 302         return &trace->syscalls.table[id];
 303
 304 out_cant_read:
 305         printf("Problems reading syscall %d", id);
 306         if (id <= trace->syscalls.max && trace->syscalls.table[id].name != NULL)
 307                 printf("(%s)", trace->syscalls.table[id].name);
 308         puts(" information");
 309         return NULL;
 310 }
 311
 312 static int trace__sys_enter(struct trace *trace, struct perf_evsel *evsel,
 313                             struct perf_sample *sample)
 314 {
 315         char *msg;
 316         void *args;
 317         size_t printed = 0;
 318         struct thread *thread;
 319         struct syscall *sc = trace__syscall_info(trace, evsel, sample);
 320         struct thread_trace *ttrace;
 321
 322         if (sc == NULL)
 323                 return -1;
 324
 325         if (sc->filtered)
 326                 return 0;
 327
 328         thread = machine__findnew_thread(&trace->host, sample->tid);
 329         ttrace = thread__trace(thread);
 330         if (ttrace == NULL)
 331                 return -1;
 332
 333         args = perf_evsel__rawptr(evsel, sample, "args");
 334         if (args == NULL) {
 335                 printf("Problems reading syscall arguments\n");
 336                 return -1;
 337         }
 338
 339         ttrace = thread->priv;
 340
 341         if (ttrace->entry_str == NULL) {
 342                 ttrace->entry_str = malloc(1024);
 343                 if (!ttrace->entry_str)
 344                         return -1;
 345         }
 346
 347         ttrace->entry_time = sample->time;
 348         msg = ttrace->entry_str;
 349         printed += scnprintf(msg + printed, 1024 - printed, "%s(", sc->name);
 350
 351         printed += syscall__scnprintf_args(sc, msg + printed, 1024 - printed,  args);
 352
 353         if (!strcmp(sc->name, "exit_group") || !strcmp(sc->name, "exit")) {
 354                 if (!trace->duration_filter) {
 355                         trace__fprintf_entry_head(trace, thread, 1, sample->time, stdout);
 356                         printf("%-70s\n", ttrace->entry_str);
 357                 }
 358         } else
 359                 ttrace->entry_pending = true;
 360
 361         return 0;
 362 }
 363
 364 static int trace__sys_exit(struct trace *trace, struct perf_evsel *evsel,
 365                            struct perf_sample *sample)
 366 {
 367         int ret;
 368         u64 duration = 0;
 369         struct thread *thread;
 370         struct syscall *sc = trace__syscall_info(trace, evsel, sample);
 371         struct thread_trace *ttrace;
 372
 373         if (sc == NULL)
 374                 return -1;
 375
 376         if (sc->filtered)
 377                 return 0;
 378
 379         thread = machine__findnew_thread(&trace->host, sample->tid);
 380         ttrace = thread__trace(thread);
 381         if (ttrace == NULL)
 382                 return -1;
 383
 384         ret = perf_evsel__intval(evsel, sample, "ret");
 385
 386         ttrace = thread->priv;
 387
 388         ttrace->exit_time = sample->time;
 389
 390         if (ttrace->entry_time) {
 391                 duration = sample->time - ttrace->entry_time;
 392                 if (trace__filter_duration(trace, duration))
 393                         goto out;
 394         } else if (trace->duration_filter)
 395                 goto out;
 396
 397         trace__fprintf_entry_head(trace, thread, duration, sample->time, stdout);
 398
 399         if (ttrace->entry_pending) {
 400                 printf("%-70s", ttrace->entry_str);
 401         } else {
 402                 printf(" ... [");
 403                 color_fprintf(stdout, PERF_COLOR_YELLOW, "continued");
 404                 printf("]: %s()", sc->name);
 405         }
 406
 407         if (ret < 0 && sc->fmt && sc->fmt->errmsg) {
 408                 char bf[256];
 409                 const char *emsg = strerror_r(-ret, bf, sizeof(bf)),
 410                            *e = audit_errno_to_name(-ret);
 411
 412                 printf(") = -1 %s %s", e, emsg);
 413         } else if (ret == 0 && sc->fmt && sc->fmt->timeout)
 414                 printf(") = 0 Timeout");
 415         else
 416                 printf(") = %d", ret);
 417
 418         putchar('\n');
 419 out:
 420         ttrace->entry_pending = false;
 421
 422         return 0;
 423 }
 424
 425 static int trace__sched_stat_runtime(struct trace *trace, struct perf_evsel *evsel,
 426                                      struct perf_sample *sample)
 427 {
 428         u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
 429         double runtime_ms = (double)runtime / NSEC_PER_MSEC;
 430         struct thread *thread = machine__findnew_thread(&trace->host, sample->tid);
 431         struct thread_trace *ttrace = thread__trace(thread);
 432
 433         if (ttrace == NULL)
 434                 goto out_dump;
 435
 436         ttrace->runtime_ms += runtime_ms;
 437         trace->runtime_ms += runtime_ms;
 438         return 0;
 439
 440 out_dump:
 441         printf("%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
 442                evsel->name,
 443                perf_evsel__strval(evsel, sample, "comm"),
 444                (pid_t)perf_evsel__intval(evsel, sample, "pid"),
 445                runtime,
 446                perf_evsel__intval(evsel, sample, "vruntime"));
 447         return 0;
 448 }
 449
 450 static int trace__run(struct trace *trace, int argc, const char **argv)
 451 {
 452         struct perf_evlist *evlist = perf_evlist__new();
 453         struct perf_evsel *evsel;
 454         int err = -1, i;
 455         unsigned long before;
 456         const bool forks = argc > 0;
 457
 458         if (evlist == NULL) {
 459                 printf("Not enough memory to run!\n");
 460                 goto out;
 461         }
 462
 463         if (perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_enter", trace__sys_enter) ||
 464             perf_evlist__add_newtp(evlist, "raw_syscalls", "sys_exit", trace__sys_exit)) {
 465                 printf("Couldn't read the raw_syscalls tracepoints information!\n");
 466                 goto out_delete_evlist;
 467         }
 468
 469         if (trace->sched &&
 470             perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
 471                                    trace__sched_stat_runtime)) {
 472                 printf("Couldn't read the sched_stat_runtime tracepoint information!\n");
 473                 goto out_delete_evlist;
 474         }
 475
 476         err = perf_evlist__create_maps(evlist, &trace->opts.target);
 477         if (err < 0) {
 478                 printf("Problems parsing the target to trace, check your options!\n");
 479                 goto out_delete_evlist;
 480         }
 481
 482         err = trace__symbols_init(trace, evlist);
 483         if (err < 0) {
 484                 printf("Problems initializing symbol libraries!\n");
 485                 goto out_delete_maps;
 486         }
 487
 488         perf_evlist__config(evlist, &trace->opts);
 489
 490         signal(SIGCHLD, sig_handler);
 491         signal(SIGINT, sig_handler);
 492
 493         if (forks) {
 494                 err = perf_evlist__prepare_workload(evlist, &trace->opts.target,
 495                                                     argv, false, false);
 496                 if (err < 0) {
 497                         printf("Couldn't run the workload!\n");
 498                         goto out_delete_maps;
 499                 }
 500         }
 501
 502         err = perf_evlist__open(evlist);
 503         if (err < 0) {
 504                 printf("Couldn't create the events: %s\n", strerror(errno));
 505                 goto out_delete_maps;
 506         }
 507
 508         err = perf_evlist__mmap(evlist, UINT_MAX, false);
 509         if (err < 0) {
 510                 printf("Couldn't mmap the events: %s\n", strerror(errno));
 511                 goto out_close_evlist;
 512         }
 513
 514         perf_evlist__enable(evlist);
 515
 516         if (forks)
 517                 perf_evlist__start_workload(evlist);
 518
 519         trace->multiple_threads = evlist->threads->map[0] == -1 || evlist->threads->nr > 1;
 520 again:
 521         before = trace->nr_events;
 522
 523         for (i = 0; i < evlist->nr_mmaps; i++) {
 524                 union perf_event *event;
 525
 526                 while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
 527                         const u32 type = event->header.type;
 528                         tracepoint_handler handler;
 529                         struct perf_sample sample;
 530
 531                         ++trace->nr_events;
 532
 533                         err = perf_evlist__parse_sample(evlist, event, &sample);
 534                         if (err) {
 535                                 printf("Can't parse sample, err = %d, skipping...\n", err);
 536                                 continue;
 537                         }
 538
 539                         if (trace->base_time == 0)
 540                                 trace->base_time = sample.time;
 541
 542                         if (type != PERF_RECORD_SAMPLE) {
 543                                 trace__process_event(&trace->host, event);
 544                                 continue;
 545                         }
 546
 547                         evsel = perf_evlist__id2evsel(evlist, sample.id);
 548                         if (evsel == NULL) {
 549                                 printf("Unknown tp ID %" PRIu64 ", skipping...\n", sample.id);
 550                                 continue;
 551                         }
 552
 553                         if (sample.raw_data == NULL) {
 554                                 printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
 555                                        perf_evsel__name(evsel), sample.tid,
 556                                        sample.cpu, sample.raw_size);
 557                                 continue;
 558                         }
 559
 560                         handler = evsel->handler.func;
 561                         handler(trace, evsel, &sample);
 562                 }
 563         }
 564
 565         if (trace->nr_events == before) {
 566                 if (done)
 567                         goto out_unmap_evlist;
 568
 569                 poll(evlist->pollfd, evlist->nr_fds, -1);
 570         }
 571
 572         if (done)
 573                 perf_evlist__disable(evlist);
 574
 575         goto again;
 576
 577 out_unmap_evlist:
 578         perf_evlist__munmap(evlist);
 579 out_close_evlist:
 580         perf_evlist__close(evlist);
 581 out_delete_maps:
 582         perf_evlist__delete_maps(evlist);
 583 out_delete_evlist:
 584         perf_evlist__delete(evlist);
 585 out:
 586         return err;
 587 }
 588
 589 static size_t trace__fprintf_threads_header(FILE *fp)
 590 {
 591         size_t printed;
 592
 593         printed  = fprintf(fp, "\n _____________________________________________________________________\n");
 594         printed += fprintf(fp," __)    Summary of events    (__\n\n");
 595         printed += fprintf(fp,"              [ task - pid ]     [ events ] [ ratio ]  [ runtime ]\n");
 596         printed += fprintf(fp," _____________________________________________________________________\n\n");
 597
 598         return printed;
 599 }
 600
 601 static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
 602 {
 603         size_t printed = trace__fprintf_threads_header(fp);
 604         struct rb_node *nd;
 605
 606         for (nd = rb_first(&trace->host.threads); nd; nd = rb_next(nd)) {
 607                 struct thread *thread = rb_entry(nd, struct thread, rb_node);
 608                 struct thread_trace *ttrace = thread->priv;
 609                 const char *color;
 610                 double ratio;
 611
 612                 if (ttrace == NULL)
 613                         continue;
 614
 615                 ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
 616
 617                 color = PERF_COLOR_NORMAL;
 618                 if (ratio > 50.0)
 619                         color = PERF_COLOR_RED;
 620                 else if (ratio > 25.0)
 621                         color = PERF_COLOR_GREEN;
 622                 else if (ratio > 5.0)
 623                         color = PERF_COLOR_YELLOW;
 624
 625                 printed += color_fprintf(fp, color, "%20s", thread->comm);
 626                 printed += fprintf(fp, " - %-5d :%11lu   [", thread->tid, ttrace->nr_events);
 627                 printed += color_fprintf(fp, color, "%5.1f%%", ratio);
 628                 printed += fprintf(fp, " ] %10.3f ms\n", ttrace->runtime_ms);
 629         }
 630
 631         return printed;
 632 }
 633
 634 static int trace__set_duration(const struct option *opt, const char *str,
 635                                int unset __maybe_unused)
 636 {
 637         struct trace *trace = opt->value;
 638
 639         trace->duration_filter = atof(str);
 640         return 0;
 641 }
 642
 643 int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused)
 644 {
 645         const char * const trace_usage[] = {
 646                 "perf trace [<options>] [<command>]",
 647                 "perf trace [<options>] -- <command> [<options>]",
 648                 NULL
 649         };
 650         struct trace trace = {
 651                 .audit_machine = audit_detect_machine(),
 652                 .syscalls = {
 653                         . max = -1,
 654                 },
 655                 .opts = {
 656                         .target = {
 657                                 .uid       = UINT_MAX,
 658                                 .uses_mmap = true,
 659                         },
 660                         .user_freq     = UINT_MAX,
 661                         .user_interval = ULLONG_MAX,
 662                         .no_delay      = true,
 663                         .mmap_pages    = 1024,
 664                 },
 665         };
 666         const char *ev_qualifier_str = NULL;
 667         const struct option trace_options[] = {
 668         OPT_STRING('e', "expr", &ev_qualifier_str, "expr",
 669                     "list of events to trace"),
 670         OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
 671                     "trace events on existing process id"),
 672         OPT_STRING(0, "tid", &trace.opts.target.tid, "tid",
 673                     "trace events on existing thread id"),
 674         OPT_BOOLEAN(0, "all-cpus", &trace.opts.target.system_wide,
 675                     "system-wide collection from all CPUs"),
 676         OPT_STRING(0, "cpu", &trace.opts.target.cpu_list, "cpu",
 677                     "list of cpus to monitor"),
 678         OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
 679                     "child tasks do not inherit counters"),
 680         OPT_UINTEGER(0, "mmap-pages", &trace.opts.mmap_pages,
 681                      "number of mmap data pages"),
 682         OPT_STRING(0, "uid", &trace.opts.target.uid_str, "user",
 683                    "user to profile"),
 684         OPT_CALLBACK(0, "duration", &trace, "float",
 685                      "show only events with duration > N.M ms",
 686                      trace__set_duration),
 687         OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
 688         OPT_END()
 689         };
 690         int err;
 691         char bf[BUFSIZ];
 692
 693         argc = parse_options(argc, argv, trace_options, trace_usage, 0);
 694
 695         if (ev_qualifier_str != NULL) {
 696                 trace.ev_qualifier = strlist__new(true, ev_qualifier_str);
 697                 if (trace.ev_qualifier == NULL) {
 698                         puts("Not enough memory to parse event qualifier");
 699                         return -ENOMEM;
 700                 }
 701         }
 702
 703         err = perf_target__validate(&trace.opts.target);
 704         if (err) {
 705                 perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
 706                 printf("%s", bf);
 707                 return err;
 708         }
 709
 710         err = perf_target__parse_uid(&trace.opts.target);
 711         if (err) {
 712                 perf_target__strerror(&trace.opts.target, err, bf, sizeof(bf));
 713                 printf("%s", bf);
 714                 return err;
 715         }
 716
 717         if (!argc && perf_target__none(&trace.opts.target))
 718                 trace.opts.target.system_wide = true;
 719
 720         err = trace__run(&trace, argc, argv);
 721
 722         if (trace.sched && !err)
 723                 trace__fprintf_thread_summary(&trace, stdout);
 724
 725         return err;
 726 }