tools/perf/builtin-record.c

   1 /*
   2  * builtin-record.c
   3  *
   4  * Builtin record command: Record the profile of a workload
   5  * (or a CPU, or a PID) into the perf.data output file - for
   6  * later analysis via perf report.
   7  */
   8 #define _FILE_OFFSET_BITS 64
   9
  10 #include "builtin.h"
  11
  12 #include "perf.h"
  13
  14 #include "util/build-id.h"
  15 #include "util/util.h"
  16 #include "util/parse-options.h"
  17 #include "util/parse-events.h"
  18 #include "util/string.h"
  19
  20 #include "util/header.h"
  21 #include "util/event.h"
  22 #include "util/debug.h"
  23 #include "util/session.h"
  24 #include "util/symbol.h"
  25 #include "util/cpumap.h"
  26
  27 #include <unistd.h>
  28 #include <sched.h>
  29
  30 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
  31
  32 static long                     default_interval                =      0;
  33
  34 static int                      nr_cpus                         =      0;
  35 static unsigned int             page_size;
  36 static unsigned int             mmap_pages                      =    128;
  37 static int                      freq                            =   1000;
  38 static int                      output;
  39 static const char               *output_name                    = "perf.data";
  40 static int                      group                           =      0;
  41 static unsigned int             realtime_prio                   =      0;
  42 static int                      raw_samples                     =      0;
  43 static int                      system_wide                     =      0;
  44 static int                      profile_cpu                     =     -1;
  45 static pid_t                    target_pid                      =     -1;
  46 static pid_t                    target_tid                      =     -1;
  47 static pid_t                    *all_tids                       =      NULL;
  48 static int                      thread_num                      =      0;
  49 static pid_t                    child_pid                       =     -1;
  50 static int                      inherit                         =      1;
  51 static int                      force                           =      0;
  52 static int                      append_file                     =      0;
  53 static int                      call_graph                      =      0;
  54 static int                      inherit_stat                    =      0;
  55 static int                      no_samples                      =      0;
  56 static int                      sample_address                  =      0;
  57 static int                      multiplex                       =      0;
  58 static int                      multiplex_fd                    =     -1;
  59
  60 static long                     samples                         =      0;
  61 static struct timeval           last_read;
  62 static struct timeval           this_read;
  63
  64 static u64                      bytes_written                   =      0;
  65
  66 static struct pollfd            *event_array;
  67
  68 static int                      nr_poll                         =      0;
  69 static int                      nr_cpu                          =      0;
  70
  71 static int                      file_new                        =      1;
  72 static off_t                    post_processing_offset;
  73
  74 static struct perf_session      *session;
  75
  76 struct mmap_data {
  77         int                     counter;
  78         void                    *base;
  79         unsigned int            mask;
  80         unsigned int            prev;
  81 };
  82
  83 static struct mmap_data         *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
  84
  85 static unsigned long mmap_read_head(struct mmap_data *md)
  86 {
  87         struct perf_event_mmap_page *pc = md->base;
  88         long head;
  89
  90         head = pc->data_head;
  91         rmb();
  92
  93         return head;
  94 }
  95
  96 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
  97 {
  98         struct perf_event_mmap_page *pc = md->base;
  99
 100         /*
 101          * ensure all reads are done before we write the tail out.
 102          */
 103         /* mb(); */
 104         pc->data_tail = tail;
 105 }
 106
 107 static void write_output(void *buf, size_t size)
 108 {
 109         while (size) {
 110                 int ret = write(output, buf, size);
 111
 112                 if (ret < 0)
 113                         die("failed to write");
 114
 115                 size -= ret;
 116                 buf += ret;
 117
 118                 bytes_written += ret;
 119         }
 120 }
 121
 122 static int process_synthesized_event(event_t *event,
 123                                      struct perf_session *self __used)
 124 {
 125         write_output(event, event->header.size);
 126         return 0;
 127 }
 128
 129 static void mmap_read(struct mmap_data *md)
 130 {
 131         unsigned int head = mmap_read_head(md);
 132         unsigned int old = md->prev;
 133         unsigned char *data = md->base + page_size;
 134         unsigned long size;
 135         void *buf;
 136         int diff;
 137
 138         gettimeofday(&this_read, NULL);
 139
 140         /*
 141          * If we're further behind than half the buffer, there's a chance
 142          * the writer will bite our tail and mess up the samples under us.
 143          *
 144          * If we somehow ended up ahead of the head, we got messed up.
 145          *
 146          * In either case, truncate and restart at head.
 147          */
 148         diff = head - old;
 149         if (diff < 0) {
 150                 struct timeval iv;
 151                 unsigned long msecs;
 152
 153                 timersub(&this_read, &last_read, &iv);
 154                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
 155
 156                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
 157                                 "  Last read %lu msecs ago.\n", msecs);
 158
 159                 /*
 160                  * head points to a known good entry, start there.
 161                  */
 162                 old = head;
 163         }
 164
 165         last_read = this_read;
 166
 167         if (old != head)
 168                 samples++;
 169
 170         size = head - old;
 171
 172         if ((old & md->mask) + size != (head & md->mask)) {
 173                 buf = &data[old & md->mask];
 174                 size = md->mask + 1 - (old & md->mask);
 175                 old += size;
 176
 177                 write_output(buf, size);
 178         }
 179
 180         buf = &data[old & md->mask];
 181         size = head - old;
 182         old += size;
 183
 184         write_output(buf, size);
 185
 186         md->prev = old;
 187         mmap_write_tail(md, old);
 188 }
 189
 190 static volatile int done = 0;
 191 static volatile int signr = -1;
 192
 193 static void sig_handler(int sig)
 194 {
 195         done = 1;
 196         signr = sig;
 197 }
 198
 199 static void sig_atexit(void)
 200 {
 201         if (child_pid != -1)
 202                 kill(child_pid, SIGTERM);
 203
 204         if (signr == -1)
 205                 return;
 206
 207         signal(signr, SIG_DFL);
 208         kill(getpid(), signr);
 209 }
 210
 211 static int group_fd;
 212
 213 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 214 {
 215         struct perf_header_attr *h_attr;
 216
 217         if (nr < session->header.attrs) {
 218                 h_attr = session->header.attr[nr];
 219         } else {
 220                 h_attr = perf_header_attr__new(a);
 221                 if (h_attr != NULL)
 222                         if (perf_header__add_attr(&session->header, h_attr) < 0) {
 223                                 perf_header_attr__delete(h_attr);
 224                                 h_attr = NULL;
 225                         }
 226         }
 227
 228         return h_attr;
 229 }
 230
 231 static void create_counter(int counter, int cpu)
 232 {
 233         char *filter = filters[counter];
 234         struct perf_event_attr *attr = attrs + counter;
 235         struct perf_header_attr *h_attr;
 236         int track = !counter; /* only the first counter needs these */
 237         int thread_index;
 238         int ret;
 239         struct {
 240                 u64 count;
 241                 u64 time_enabled;
 242                 u64 time_running;
 243                 u64 id;
 244         } read_data;
 245
 246         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
 247                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
 248                                   PERF_FORMAT_ID;
 249
 250         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 251
 252         if (nr_counters > 1)
 253                 attr->sample_type |= PERF_SAMPLE_ID;
 254
 255         if (freq) {
 256                 attr->sample_type       |= PERF_SAMPLE_PERIOD;
 257                 attr->freq              = 1;
 258                 attr->sample_freq       = freq;
 259         }
 260
 261         if (no_samples)
 262                 attr->sample_freq = 0;
 263
 264         if (inherit_stat)
 265                 attr->inherit_stat = 1;
 266
 267         if (sample_address)
 268                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 269
 270         if (call_graph)
 271                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 272
 273         if (raw_samples) {
 274                 attr->sample_type       |= PERF_SAMPLE_TIME;
 275                 attr->sample_type       |= PERF_SAMPLE_RAW;
 276                 attr->sample_type       |= PERF_SAMPLE_CPU;
 277         }
 278
 279         attr->mmap              = track;
 280         attr->comm              = track;
 281         attr->inherit           = inherit;
 282         if (target_pid == -1 && !system_wide) {
 283                 attr->disabled = 1;
 284                 attr->enable_on_exec = 1;
 285         }
 286
 287         for (thread_index = 0; thread_index < thread_num; thread_index++) {
 288 try_again:
 289                 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
 290                                 all_tids[thread_index], cpu, group_fd, 0);
 291
 292                 if (fd[nr_cpu][counter][thread_index] < 0) {
 293                         int err = errno;
 294
 295                         if (err == EPERM || err == EACCES)
 296                                 die("Permission error - are you root?\n"
 297                                         "\t Consider tweaking"
 298                                         " /proc/sys/kernel/perf_event_paranoid.\n");
 299                         else if (err ==  ENODEV && profile_cpu != -1) {
 300                                 die("No such device - did you specify"
 301                                         " an out-of-range profile CPU?\n");
 302                         }
 303
 304                         /*
 305                          * If it's cycles then fall back to hrtimer
 306                          * based cpu-clock-tick sw counter, which
 307                          * is always available even if no PMU support:
 308                          */
 309                         if (attr->type == PERF_TYPE_HARDWARE
 310                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 311
 312                                 if (verbose)
 313                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
 314                                 attr->type = PERF_TYPE_SOFTWARE;
 315                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 316                                 goto try_again;
 317                         }
 318                         printf("\n");
 319                         error("perfcounter syscall returned with %d (%s)\n",
 320                                         fd[nr_cpu][counter][thread_index], strerror(err));
 321
 322 #if defined(__i386__) || defined(__x86_64__)
 323                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 324                                 die("No hardware sampling interrupt available."
 325                                     " No APIC? If so then you can boot the kernel"
 326                                     " with the \"lapic\" boot parameter to"
 327                                     " force-enable it.\n");
 328 #endif
 329
 330                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 331                         exit(-1);
 332                 }
 333
 334                 h_attr = get_header_attr(attr, counter);
 335                 if (h_attr == NULL)
 336                         die("nomem\n");
 337
 338                 if (!file_new) {
 339                         if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
 340                                 fprintf(stderr, "incompatible append\n");
 341                                 exit(-1);
 342                         }
 343                 }
 344
 345                 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
 346                         perror("Unable to read perf file descriptor\n");
 347                         exit(-1);
 348                 }
 349
 350                 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
 351                         pr_warning("Not enough memory to add id\n");
 352                         exit(-1);
 353                 }
 354
 355                 assert(fd[nr_cpu][counter][thread_index] >= 0);
 356                 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
 357
 358                 /*
 359                  * First counter acts as the group leader:
 360                  */
 361                 if (group && group_fd == -1)
 362                         group_fd = fd[nr_cpu][counter][thread_index];
 363                 if (multiplex && multiplex_fd == -1)
 364                         multiplex_fd = fd[nr_cpu][counter][thread_index];
 365
 366                 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
 367
 368                         ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
 369                         assert(ret != -1);
 370                 } else {
 371                         event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
 372                         event_array[nr_poll].events = POLLIN;
 373                         nr_poll++;
 374
 375                         mmap_array[nr_cpu][counter][thread_index].counter = counter;
 376                         mmap_array[nr_cpu][counter][thread_index].prev = 0;
 377                         mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
 378                         mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
 379                                 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
 380                         if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
 381                                 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
 382                                 exit(-1);
 383                         }
 384                 }
 385
 386                 if (filter != NULL) {
 387                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 388                                         PERF_EVENT_IOC_SET_FILTER, filter);
 389                         if (ret) {
 390                                 error("failed to set filter with %d (%s)\n", errno,
 391                                                 strerror(errno));
 392                                 exit(-1);
 393                         }
 394                 }
 395         }
 396 }
 397
 398 static void open_counters(int cpu)
 399 {
 400         int counter;
 401
 402         group_fd = -1;
 403         for (counter = 0; counter < nr_counters; counter++)
 404                 create_counter(counter, cpu);
 405
 406         nr_cpu++;
 407 }
 408
 409 static int process_buildids(void)
 410 {
 411         u64 size = lseek(output, 0, SEEK_CUR);
 412
 413         if (size == 0)
 414                 return 0;
 415
 416         session->fd = output;
 417         return __perf_session__process_events(session, post_processing_offset,
 418                                               size - post_processing_offset,
 419                                               size, &build_id__mark_dso_hit_ops);
 420 }
 421
 422 static void atexit_header(void)
 423 {
 424         session->header.data_size += bytes_written;
 425
 426         process_buildids();
 427         perf_header__write(&session->header, output, true);
 428 }
 429
 430 static int __cmd_record(int argc, const char **argv)
 431 {
 432         int i, counter;
 433         struct stat st;
 434         pid_t pid = 0;
 435         int flags;
 436         int err;
 437         unsigned long waking = 0;
 438         int child_ready_pipe[2], go_pipe[2];
 439         const bool forks = argc > 0;
 440         char buf;
 441
 442         page_size = sysconf(_SC_PAGE_SIZE);
 443
 444         atexit(sig_atexit);
 445         signal(SIGCHLD, sig_handler);
 446         signal(SIGINT, sig_handler);
 447
 448         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 449                 perror("failed to create pipes");
 450                 exit(-1);
 451         }
 452
 453         if (!stat(output_name, &st) && st.st_size) {
 454                 if (!force) {
 455                         if (!append_file) {
 456                                 pr_err("Error, output file %s exists, use -A "
 457                                        "to append or -f to overwrite.\n",
 458                                        output_name);
 459                                 exit(-1);
 460                         }
 461                 } else {
 462                         char oldname[PATH_MAX];
 463                         snprintf(oldname, sizeof(oldname), "%s.old",
 464                                  output_name);
 465                         unlink(oldname);
 466                         rename(output_name, oldname);
 467                 }
 468         } else {
 469                 append_file = 0;
 470         }
 471
 472         flags = O_CREAT|O_RDWR;
 473         if (append_file)
 474                 file_new = 0;
 475         else
 476                 flags |= O_TRUNC;
 477
 478         output = open(output_name, flags, S_IRUSR|S_IWUSR);
 479         if (output < 0) {
 480                 perror("failed to create output file");
 481                 exit(-1);
 482         }
 483
 484         session = perf_session__new(output_name, O_WRONLY, force);
 485         if (session == NULL) {
 486                 pr_err("Not enough memory for reading perf file header\n");
 487                 return -1;
 488         }
 489
 490         if (!file_new) {
 491                 err = perf_header__read(&session->header, output);
 492                 if (err < 0)
 493                         return err;
 494         }
 495
 496         if (raw_samples) {
 497                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 498         } else {
 499                 for (i = 0; i < nr_counters; i++) {
 500                         if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
 501                                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 502                                 break;
 503                         }
 504                 }
 505         }
 506
 507         atexit(atexit_header);
 508
 509         if (forks) {
 510                 child_pid = fork();
 511                 if (pid < 0) {
 512                         perror("failed to fork");
 513                         exit(-1);
 514                 }
 515
 516                 if (!child_pid) {
 517                         close(child_ready_pipe[0]);
 518                         close(go_pipe[1]);
 519                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 520
 521                         /*
 522                          * Do a dummy execvp to get the PLT entry resolved,
 523                          * so we avoid the resolver overhead on the real
 524                          * execvp call.
 525                          */
 526                         execvp("", (char **)argv);
 527
 528                         /*
 529                          * Tell the parent we're ready to go
 530                          */
 531                         close(child_ready_pipe[1]);
 532
 533                         /*
 534                          * Wait until the parent tells us to go.
 535                          */
 536                         if (read(go_pipe[0], &buf, 1) == -1)
 537                                 perror("unable to read pipe");
 538
 539                         execvp(argv[0], (char **)argv);
 540
 541                         perror(argv[0]);
 542                         exit(-1);
 543                 }
 544
 545                 if (!system_wide && target_tid == -1 && target_pid == -1)
 546                         all_tids[0] = child_pid;
 547
 548                 close(child_ready_pipe[1]);
 549                 close(go_pipe[0]);
 550                 /*
 551                  * wait for child to settle
 552                  */
 553                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
 554                         perror("unable to read pipe");
 555                         exit(-1);
 556                 }
 557                 close(child_ready_pipe[0]);
 558         }
 559
 560         if ((!system_wide && !inherit) || profile_cpu != -1) {
 561                 open_counters(profile_cpu);
 562         } else {
 563                 nr_cpus = read_cpu_map();
 564                 for (i = 0; i < nr_cpus; i++)
 565                         open_counters(cpumap[i]);
 566         }
 567
 568         if (file_new) {
 569                 err = perf_header__write(&session->header, output, false);
 570                 if (err < 0)
 571                         return err;
 572         }
 573
 574         post_processing_offset = lseek(output, 0, SEEK_CUR);
 575
 576         err = event__synthesize_kernel_mmap(process_synthesized_event,
 577                                             session, "_text");
 578         if (err < 0) {
 579                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 580                 return err;
 581         }
 582
 583         err = event__synthesize_modules(process_synthesized_event, session);
 584         if (err < 0) {
 585                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 586                 return err;
 587         }
 588
 589         if (!system_wide && profile_cpu == -1)
 590                 event__synthesize_thread(target_tid, process_synthesized_event,
 591                                          session);
 592         else
 593                 event__synthesize_threads(process_synthesized_event, session);
 594
 595         if (realtime_prio) {
 596                 struct sched_param param;
 597
 598                 param.sched_priority = realtime_prio;
 599                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 600                         pr_err("Could not set realtime priority.\n");
 601                         exit(-1);
 602                 }
 603         }
 604
 605         /*
 606          * Let the child rip
 607          */
 608         if (forks)
 609                 close(go_pipe[1]);
 610
 611         for (;;) {
 612                 int hits = samples;
 613                 int thread;
 614
 615                 for (i = 0; i < nr_cpu; i++) {
 616                         for (counter = 0; counter < nr_counters; counter++) {
 617                                 for (thread = 0;
 618                                         thread < thread_num; thread++) {
 619                                         if (mmap_array[i][counter][thread].base)
 620                                                 mmap_read(&mmap_array[i][counter][thread]);
 621                                 }
 622
 623                         }
 624                 }
 625
 626                 if (hits == samples) {
 627                         if (done)
 628                                 break;
 629                         err = poll(event_array, nr_poll, -1);
 630                         waking++;
 631                 }
 632
 633                 if (done) {
 634                         for (i = 0; i < nr_cpu; i++) {
 635                                 for (counter = 0;
 636                                         counter < nr_counters;
 637                                         counter++) {
 638                                         for (thread = 0;
 639                                                 thread < thread_num;
 640                                                 thread++)
 641                                                 ioctl(fd[i][counter][thread],
 642                                                         PERF_EVENT_IOC_DISABLE);
 643                                 }
 644                         }
 645                 }
 646         }
 647
 648         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 649
 650         /*
 651          * Approximate RIP event size: 24 bytes.
 652          */
 653         fprintf(stderr,
 654                 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
 655                 (double)bytes_written / 1024.0 / 1024.0,
 656                 output_name,
 657                 bytes_written / 24);
 658
 659         return 0;
 660 }
 661
 662 static const char * const record_usage[] = {
 663         "perf record [<options>] [<command>]",
 664         "perf record [<options>] -- <command> [<options>]",
 665         NULL
 666 };
 667
 668 static const struct option options[] = {
 669         OPT_CALLBACK('e', "event", NULL, "event",
 670                      "event selector. use 'perf list' to list available events",
 671                      parse_events),
 672         OPT_CALLBACK(0, "filter", NULL, "filter",
 673                      "event filter", parse_filter),
 674         OPT_INTEGER('p', "pid", &target_pid,
 675                     "record events on existing process id"),
 676         OPT_INTEGER('t', "tid", &target_tid,
 677                     "record events on existing thread id"),
 678         OPT_INTEGER('r', "realtime", &realtime_prio,
 679                     "collect data with this RT SCHED_FIFO priority"),
 680         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
 681                     "collect raw sample records from all opened counters"),
 682         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 683                             "system-wide collection from all CPUs"),
 684         OPT_BOOLEAN('A', "append", &append_file,
 685                             "append to the output file to do incremental profiling"),
 686         OPT_INTEGER('C', "profile_cpu", &profile_cpu,
 687                             "CPU to profile on"),
 688         OPT_BOOLEAN('f', "force", &force,
 689                         "overwrite existing data file"),
 690         OPT_LONG('c', "count", &default_interval,
 691                     "event period to sample"),
 692         OPT_STRING('o', "output", &output_name, "file",
 693                     "output file name"),
 694         OPT_BOOLEAN('i', "inherit", &inherit,
 695                     "child tasks inherit counters"),
 696         OPT_INTEGER('F', "freq", &freq,
 697                     "profile at this frequency"),
 698         OPT_INTEGER('m', "mmap-pages", &mmap_pages,
 699                     "number of mmap data pages"),
 700         OPT_BOOLEAN('g', "call-graph", &call_graph,
 701                     "do call-graph (stack chain/backtrace) recording"),
 702         OPT_BOOLEAN('v', "verbose", &verbose,
 703                     "be more verbose (show counter open errors, etc)"),
 704         OPT_BOOLEAN('s', "stat", &inherit_stat,
 705                     "per thread counts"),
 706         OPT_BOOLEAN('d', "data", &sample_address,
 707                     "Sample addresses"),
 708         OPT_BOOLEAN('n', "no-samples", &no_samples,
 709                     "don't sample"),
 710         OPT_BOOLEAN('M', "multiplex", &multiplex,
 711                     "multiplex counter output in a single channel"),
 712         OPT_END()
 713 };
 714
 715 int cmd_record(int argc, const char **argv, const char *prefix __used)
 716 {
 717         int counter;
 718         int i,j;
 719
 720         argc = parse_options(argc, argv, options, record_usage,
 721                             PARSE_OPT_STOP_AT_NON_OPTION);
 722         if (!argc && target_pid == -1 && target_tid == -1 &&
 723                 !system_wide && profile_cpu == -1)
 724                 usage_with_options(record_usage, options);
 725
 726         symbol__init();
 727
 728         if (!nr_counters) {
 729                 nr_counters     = 1;
 730                 attrs[0].type   = PERF_TYPE_HARDWARE;
 731                 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
 732         }
 733
 734         if (target_pid != -1) {
 735                 target_tid = target_pid;
 736                 thread_num = find_all_tid(target_pid, &all_tids);
 737                 if (thread_num <= 0) {
 738                         fprintf(stderr, "Can't find all threads of pid %d\n",
 739                                         target_pid);
 740                         usage_with_options(record_usage, options);
 741                 }
 742         } else {
 743                 all_tids=malloc(sizeof(pid_t));
 744                 if (!all_tids)
 745                         return -ENOMEM;
 746
 747                 all_tids[0] = target_tid;
 748                 thread_num = 1;
 749         }
 750
 751         for (i = 0; i < MAX_NR_CPUS; i++) {
 752                 for (j = 0; j < MAX_COUNTERS; j++) {
 753                         fd[i][j] = malloc(sizeof(int)*thread_num);
 754                         mmap_array[i][j] = malloc(
 755                                 sizeof(struct mmap_data)*thread_num);
 756                         if (!fd[i][j] || !mmap_array[i][j])
 757                                 return -ENOMEM;
 758                 }
 759         }
 760         event_array = malloc(
 761                 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
 762         if (!event_array)
 763                 return -ENOMEM;
 764
 765         /*
 766          * User specified count overrides default frequency.
 767          */
 768         if (default_interval)
 769                 freq = 0;
 770         else if (freq) {
 771                 default_interval = freq;
 772         } else {
 773                 fprintf(stderr, "frequency and count are zero, aborting\n");
 774                 exit(EXIT_FAILURE);
 775         }
 776
 777         for (counter = 0; counter < nr_counters; counter++) {
 778                 if (attrs[counter].sample_period)
 779                         continue;
 780
 781                 attrs[counter].sample_period = default_interval;
 782         }
 783
 784         return __cmd_record(argc, argv);
 785 }