SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  19 #include "util/header.h"
  20 #include "util/event.h"
  21 #include "util/debug.h"
  22 #include "util/session.h"
  23 #include "util/symbol.h"
  24 #include "util/cpumap.h"
  25
  26 #include <unistd.h>
  27 #include <sched.h>
  28
  29 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
  30
  31 static long                     default_interval                =      0;
  32
  33 static int                      nr_cpus                         =      0;
  34 static unsigned int             page_size;
  35 static unsigned int             mmap_pages                      =    128;
  36 static int                      freq                            =   1000;
  37 static int                      output;
  38 static const char               *output_name                    = "perf.data";
  39 static int                      group                           =      0;
  40 static unsigned int             realtime_prio                   =      0;
  41 static int                      raw_samples                     =      0;
  42 static int                      system_wide                     =      0;
  43 static int                      profile_cpu                     =     -1;
  44 static pid_t                    target_pid                      =     -1;
  45 static pid_t                    target_tid                      =     -1;
  46 static pid_t                    *all_tids                       =      NULL;
  47 static int                      thread_num                      =      0;
  48 static pid_t                    child_pid                       =     -1;
  49 static int                      inherit                         =      1;
  50 static int                      force                           =      0;
  51 static int                      append_file                     =      0;
  52 static int                      call_graph                      =      0;
  53 static int                      inherit_stat                    =      0;
  54 static int                      no_samples                      =      0;
  55 static int                      sample_address                  =      0;
  56 static int                      multiplex                       =      0;
  57 static int                      multiplex_fd                    =     -1;
  58
  59 static long                     samples                         =      0;
  60 static struct timeval           last_read;
  61 static struct timeval           this_read;
  62
  63 static u64                      bytes_written                   =      0;
  64
  65 static struct pollfd            *event_array;
  66
  67 static int                      nr_poll                         =      0;
  68 static int                      nr_cpu                          =      0;
  69
  70 static int                      file_new                        =      1;
  71 static off_t                    post_processing_offset;
  72
  73 static struct perf_session      *session;
  74
  75 struct mmap_data {
  76         int                     counter;
  77         void                    *base;
  78         unsigned int            mask;
  79         unsigned int            prev;
  80 };
  81
  82 static struct mmap_data         *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
  83
  84 static unsigned long mmap_read_head(struct mmap_data *md)
  85 {
  86         struct perf_event_mmap_page *pc = md->base;
  87         long head;
  88
  89         head = pc->data_head;
  90         rmb();
  91
  92         return head;
  93 }
  94
  95 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
  96 {
  97         struct perf_event_mmap_page *pc = md->base;
  98
  99         /*
 100          * ensure all reads are done before we write the tail out.
 101          */
 102         /* mb(); */
 103         pc->data_tail = tail;
 104 }
 105
 106 static void write_output(void *buf, size_t size)
 107 {
 108         while (size) {
 109                 int ret = write(output, buf, size);
 110
 111                 if (ret < 0)
 112                         die("failed to write");
 113
 114                 size -= ret;
 115                 buf += ret;
 116
 117                 bytes_written += ret;
 118         }
 119 }
 120
 121 static int process_synthesized_event(event_t *event,
 122                                      struct perf_session *self __used)
 123 {
 124         write_output(event, event->header.size);
 125         return 0;
 126 }
 127
 128 static void mmap_read(struct mmap_data *md)
 129 {
 130         unsigned int head = mmap_read_head(md);
 131         unsigned int old = md->prev;
 132         unsigned char *data = md->base + page_size;
 133         unsigned long size;
 134         void *buf;
 135         int diff;
 136
 137         gettimeofday(&this_read, NULL);
 138
 139         /*
 140          * If we're further behind than half the buffer, there's a chance
 141          * the writer will bite our tail and mess up the samples under us.
 142          *
 143          * If we somehow ended up ahead of the head, we got messed up.
 144          *
 145          * In either case, truncate and restart at head.
 146          */
 147         diff = head - old;
 148         if (diff < 0) {
 149                 struct timeval iv;
 150                 unsigned long msecs;
 151
 152                 timersub(&this_read, &last_read, &iv);
 153                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
 154
 155                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
 156                                 "  Last read %lu msecs ago.\n", msecs);
 157
 158                 /*
 159                  * head points to a known good entry, start there.
 160                  */
 161                 old = head;
 162         }
 163
 164         last_read = this_read;
 165
 166         if (old != head)
 167                 samples++;
 168
 169         size = head - old;
 170
 171         if ((old & md->mask) + size != (head & md->mask)) {
 172                 buf = &data[old & md->mask];
 173                 size = md->mask + 1 - (old & md->mask);
 174                 old += size;
 175
 176                 write_output(buf, size);
 177         }
 178
 179         buf = &data[old & md->mask];
 180         size = head - old;
 181         old += size;
 182
 183         write_output(buf, size);
 184
 185         md->prev = old;
 186         mmap_write_tail(md, old);
 187 }
 188
 189 static volatile int done = 0;
 190 static volatile int signr = -1;
 191
 192 static void sig_handler(int sig)
 193 {
 194         done = 1;
 195         signr = sig;
 196 }
 197
 198 static void sig_atexit(void)
 199 {
 200         if (child_pid != -1)
 201                 kill(child_pid, SIGTERM);
 202
 203         if (signr == -1)
 204                 return;
 205
 206         signal(signr, SIG_DFL);
 207         kill(getpid(), signr);
 208 }
 209
 210 static int group_fd;
 211
 212 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 213 {
 214         struct perf_header_attr *h_attr;
 215
 216         if (nr < session->header.attrs) {
 217                 h_attr = session->header.attr[nr];
 218         } else {
 219                 h_attr = perf_header_attr__new(a);
 220                 if (h_attr != NULL)
 221                         if (perf_header__add_attr(&session->header, h_attr) < 0) {
 222                                 perf_header_attr__delete(h_attr);
 223                                 h_attr = NULL;
 224                         }
 225         }
 226
 227         return h_attr;
 228 }
 229
 230 static void create_counter(int counter, int cpu)
 231 {
 232         char *filter = filters[counter];
 233         struct perf_event_attr *attr = attrs + counter;
 234         struct perf_header_attr *h_attr;
 235         int track = !counter; /* only the first counter needs these */
 236         int thread_index;
 237         int ret;
 238         struct {
 239                 u64 count;
 240                 u64 time_enabled;
 241                 u64 time_running;
 242                 u64 id;
 243         } read_data;
 244
 245         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
 246                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
 247                                   PERF_FORMAT_ID;
 248
 249         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 250
 251         if (nr_counters > 1)
 252                 attr->sample_type |= PERF_SAMPLE_ID;
 253
 254         if (freq) {
 255                 attr->sample_type       |= PERF_SAMPLE_PERIOD;
 256                 attr->freq              = 1;
 257                 attr->sample_freq       = freq;
 258         }
 259
 260         if (no_samples)
 261                 attr->sample_freq = 0;
 262
 263         if (inherit_stat)
 264                 attr->inherit_stat = 1;
 265
 266         if (sample_address)
 267                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 268
 269         if (call_graph)
 270                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 271
 272         if (raw_samples) {
 273                 attr->sample_type       |= PERF_SAMPLE_TIME;
 274                 attr->sample_type       |= PERF_SAMPLE_RAW;
 275                 attr->sample_type       |= PERF_SAMPLE_CPU;
 276         }
 277
 278         attr->mmap              = track;
 279         attr->comm              = track;
 280         attr->inherit           = inherit;
 281         if (target_pid == -1 && !system_wide) {
 282                 attr->disabled = 1;
 283                 attr->enable_on_exec = 1;
 284         }
 285
 286         for (thread_index = 0; thread_index < thread_num; thread_index++) {
 287 try_again:
 288                 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
 289                                 all_tids[thread_index], cpu, group_fd, 0);
 290
 291                 if (fd[nr_cpu][counter][thread_index] < 0) {
 292                         int err = errno;
 293
 294                         if (err == EPERM || err == EACCES)
 295                                 die("Permission error - are you root?\n"
 296                                         "\t Consider tweaking"
 297                                         " /proc/sys/kernel/perf_event_paranoid.\n");
 298                         else if (err ==  ENODEV && profile_cpu != -1) {
 299                                 die("No such device - did you specify"
 300                                         " an out-of-range profile CPU?\n");
 301                         }
 302
 303                         /*
 304                          * If it's cycles then fall back to hrtimer
 305                          * based cpu-clock-tick sw counter, which
 306                          * is always available even if no PMU support:
 307                          */
 308                         if (attr->type == PERF_TYPE_HARDWARE
 309                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 310
 311                                 if (verbose)
 312                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
 313                                 attr->type = PERF_TYPE_SOFTWARE;
 314                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 315                                 goto try_again;
 316                         }
 317                         printf("\n");
 318                         error("perfcounter syscall returned with %d (%s)\n",
 319                                         fd[nr_cpu][counter][thread_index], strerror(err));
 320
 321 #if defined(__i386__) || defined(__x86_64__)
 322                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 323                                 die("No hardware sampling interrupt available."
 324                                     " No APIC? If so then you can boot the kernel"
 325                                     " with the \"lapic\" boot parameter to"
 326                                     " force-enable it.\n");
 327 #endif
 328
 329                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 330                         exit(-1);
 331                 }
 332
 333                 h_attr = get_header_attr(attr, counter);
 334                 if (h_attr == NULL)
 335                         die("nomem\n");
 336
 337                 if (!file_new) {
 338                         if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
 339                                 fprintf(stderr, "incompatible append\n");
 340                                 exit(-1);
 341                         }
 342                 }
 343
 344                 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
 345                         perror("Unable to read perf file descriptor\n");
 346                         exit(-1);
 347                 }
 348
 349                 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
 350                         pr_warning("Not enough memory to add id\n");
 351                         exit(-1);
 352                 }
 353
 354                 assert(fd[nr_cpu][counter][thread_index] >= 0);
 355                 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
 356
 357                 /*
 358                  * First counter acts as the group leader:
 359                  */
 360                 if (group && group_fd == -1)
 361                         group_fd = fd[nr_cpu][counter][thread_index];
 362                 if (multiplex && multiplex_fd == -1)
 363                         multiplex_fd = fd[nr_cpu][counter][thread_index];
 364
 365                 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
 366
 367                         ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
 368                         assert(ret != -1);
 369                 } else {
 370                         event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
 371                         event_array[nr_poll].events = POLLIN;
 372                         nr_poll++;
 373
 374                         mmap_array[nr_cpu][counter][thread_index].counter = counter;
 375                         mmap_array[nr_cpu][counter][thread_index].prev = 0;
 376                         mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
 377                         mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
 378                                 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
 379                         if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
 380                                 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
 381                                 exit(-1);
 382                         }
 383                 }
 384
 385                 if (filter != NULL) {
 386                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 387                                         PERF_EVENT_IOC_SET_FILTER, filter);
 388                         if (ret) {
 389                                 error("failed to set filter with %d (%s)\n", errno,
 390                                                 strerror(errno));
 391                                 exit(-1);
 392                         }
 393                 }
 394         }
 395 }
 396
 397 static void open_counters(int cpu)
 398 {
 399         int counter;
 400
 401         group_fd = -1;
 402         for (counter = 0; counter < nr_counters; counter++)
 403                 create_counter(counter, cpu);
 404
 405         nr_cpu++;
 406 }
 407
 408 static int process_buildids(void)
 409 {
 410         u64 size = lseek(output, 0, SEEK_CUR);
 411
 412         if (size == 0)
 413                 return 0;
 414
 415         session->fd = output;
 416         return __perf_session__process_events(session, post_processing_offset,
 417                                               size - post_processing_offset,
 418                                               size, &build_id__mark_dso_hit_ops);
 419 }
 420
 421 static void atexit_header(void)
 422 {
 423         session->header.data_size += bytes_written;
 424
 425         process_buildids();
 426         perf_header__write(&session->header, output, true);
 427 }
 428
 429 static int __cmd_record(int argc, const char **argv)
 430 {
 431         int i, counter;
 432         struct stat st;
 433         pid_t pid = 0;
 434         int flags;
 435         int err;
 436         unsigned long waking = 0;
 437         int child_ready_pipe[2], go_pipe[2];
 438         const bool forks = argc > 0;
 439         char buf;
 440
 441         page_size = sysconf(_SC_PAGE_SIZE);
 442
 443         atexit(sig_atexit);
 444         signal(SIGCHLD, sig_handler);
 445         signal(SIGINT, sig_handler);
 446
 447         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 448                 perror("failed to create pipes");
 449                 exit(-1);
 450         }
 451
 452         if (!stat(output_name, &st) && st.st_size) {
 453                 if (!force) {
 454                         if (!append_file) {
 455                                 pr_err("Error, output file %s exists, use -A "
 456                                        "to append or -f to overwrite.\n",
 457                                        output_name);
 458                                 exit(-1);
 459                         }
 460                 } else {
 461                         char oldname[PATH_MAX];
 462                         snprintf(oldname, sizeof(oldname), "%s.old",
 463                                  output_name);
 464                         unlink(oldname);
 465                         rename(output_name, oldname);
 466                 }
 467         } else {
 468                 append_file = 0;
 469         }
 470
 471         flags = O_CREAT|O_RDWR;
 472         if (append_file)
 473                 file_new = 0;
 474         else
 475                 flags |= O_TRUNC;
 476
 477         output = open(output_name, flags, S_IRUSR|S_IWUSR);
 478         if (output < 0) {
 479                 perror("failed to create output file");
 480                 exit(-1);
 481         }
 482
 483         session = perf_session__new(output_name, O_WRONLY, force);
 484         if (session == NULL) {
 485                 pr_err("Not enough memory for reading perf file header\n");
 486                 return -1;
 487         }
 488
 489         if (!file_new) {
 490                 err = perf_header__read(&session->header, output);
 491                 if (err < 0)
 492                         return err;
 493         }
 494
 495         if (raw_samples) {
 496                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 497         } else {
 498                 for (i = 0; i < nr_counters; i++) {
 499                         if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
 500                                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 501                                 break;
 502                         }
 503                 }
 504         }
 505
 506         atexit(atexit_header);
 507
 508         if (forks) {
 509                 child_pid = fork();
 510                 if (pid < 0) {
 511                         perror("failed to fork");
 512                         exit(-1);
 513                 }
 514
 515                 if (!child_pid) {
 516                         close(child_ready_pipe[0]);
 517                         close(go_pipe[1]);
 518                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 519
 520                         /*
 521                          * Do a dummy execvp to get the PLT entry resolved,
 522                          * so we avoid the resolver overhead on the real
 523                          * execvp call.
 524                          */
 525                         execvp("", (char **)argv);
 526
 527                         /*
 528                          * Tell the parent we're ready to go
 529                          */
 530                         close(child_ready_pipe[1]);
 531
 532                         /*
 533                          * Wait until the parent tells us to go.
 534                          */
 535                         if (read(go_pipe[0], &buf, 1) == -1)
 536                                 perror("unable to read pipe");
 537
 538                         execvp(argv[0], (char **)argv);
 539
 540                         perror(argv[0]);
 541                         exit(-1);
 542                 }
 543
 544                 if (!system_wide && target_tid == -1 && target_pid == -1)
 545                         all_tids[0] = child_pid;
 546
 547                 close(child_ready_pipe[1]);
 548                 close(go_pipe[0]);
 549                 /*
 550                  * wait for child to settle
 551                  */
 552                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
 553                         perror("unable to read pipe");
 554                         exit(-1);
 555                 }
 556                 close(child_ready_pipe[0]);
 557         }
 558
 559         if ((!system_wide && !inherit) || profile_cpu != -1) {
 560                 open_counters(profile_cpu);
 561         } else {
 562                 nr_cpus = read_cpu_map();
 563                 for (i = 0; i < nr_cpus; i++)
 564                         open_counters(cpumap[i]);
 565         }
 566
 567         if (file_new) {
 568                 err = perf_header__write(&session->header, output, false);
 569                 if (err < 0)
 570                         return err;
 571         }
 572
 573         post_processing_offset = lseek(output, 0, SEEK_CUR);
 574
 575         err = event__synthesize_kernel_mmap(process_synthesized_event,
 576                                             session, "_text");
 577         if (err < 0)
 578                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 579                                                     session, "_stext");
 580         if (err < 0) {
 581                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 582                 return err;
 583         }
 584
 585         err = event__synthesize_modules(process_synthesized_event, session);
 586         if (err < 0) {
 587                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 588                 return err;
 589         }
 590
 591         if (!system_wide && profile_cpu == -1)
 592                 event__synthesize_thread(target_tid, process_synthesized_event,
 593                                          session);
 594         else
 595                 event__synthesize_threads(process_synthesized_event, session);
 596
 597         if (realtime_prio) {
 598                 struct sched_param param;
 599
 600                 param.sched_priority = realtime_prio;
 601                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 602                         pr_err("Could not set realtime priority.\n");
 603                         exit(-1);
 604                 }
 605         }
 606
 607         /*
 608          * Let the child rip
 609          */
 610         if (forks)
 611                 close(go_pipe[1]);
 612
 613         for (;;) {
 614                 int hits = samples;
 615                 int thread;
 616
 617                 for (i = 0; i < nr_cpu; i++) {
 618                         for (counter = 0; counter < nr_counters; counter++) {
 619                                 for (thread = 0;
 620                                         thread < thread_num; thread++) {
 621                                         if (mmap_array[i][counter][thread].base)
 622                                                 mmap_read(&mmap_array[i][counter][thread]);
 623                                 }
 624
 625                         }
 626                 }
 627
 628                 if (hits == samples) {
 629                         if (done)
 630                                 break;
 631                         err = poll(event_array, nr_poll, -1);
 632                         waking++;
 633                 }
 634
 635                 if (done) {
 636                         for (i = 0; i < nr_cpu; i++) {
 637                                 for (counter = 0;
 638                                         counter < nr_counters;
 639                                         counter++) {
 640                                         for (thread = 0;
 641                                                 thread < thread_num;
 642                                                 thread++)
 643                                                 ioctl(fd[i][counter][thread],
 644                                                         PERF_EVENT_IOC_DISABLE);
 645                                 }
 646                         }
 647                 }
 648         }
 649
 650         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 651
 652         /*
 653          * Approximate RIP event size: 24 bytes.
 654          */
 655         fprintf(stderr,
 656                 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
 657                 (double)bytes_written / 1024.0 / 1024.0,
 658                 output_name,
 659                 bytes_written / 24);
 660
 661         return 0;
 662 }
 663
 664 static const char * const record_usage[] = {
 665         "perf record [<options>] [<command>]",
 666         "perf record [<options>] -- <command> [<options>]",
 667         NULL
 668 };
 669
 670 static const struct option options[] = {
 671         OPT_CALLBACK('e', "event", NULL, "event",
 672                      "event selector. use 'perf list' to list available events",
 673                      parse_events),
 674         OPT_CALLBACK(0, "filter", NULL, "filter",
 675                      "event filter", parse_filter),
 676         OPT_INTEGER('p', "pid", &target_pid,
 677                     "record events on existing process id"),
 678         OPT_INTEGER('t', "tid", &target_tid,
 679                     "record events on existing thread id"),
 680         OPT_INTEGER('r', "realtime", &realtime_prio,
 681                     "collect data with this RT SCHED_FIFO priority"),
 682         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
 683                     "collect raw sample records from all opened counters"),
 684         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 685                             "system-wide collection from all CPUs"),
 686         OPT_BOOLEAN('A', "append", &append_file,
 687                             "append to the output file to do incremental profiling"),
 688         OPT_INTEGER('C', "profile_cpu", &profile_cpu,
 689                             "CPU to profile on"),
 690         OPT_BOOLEAN('f', "force", &force,
 691                         "overwrite existing data file"),
 692         OPT_LONG('c', "count", &default_interval,
 693                     "event period to sample"),
 694         OPT_STRING('o', "output", &output_name, "file",
 695                     "output file name"),
 696         OPT_BOOLEAN('i', "inherit", &inherit,
 697                     "child tasks inherit counters"),
 698         OPT_INTEGER('F', "freq", &freq,
 699                     "profile at this frequency"),
 700         OPT_INTEGER('m', "mmap-pages", &mmap_pages,
 701                     "number of mmap data pages"),
 702         OPT_BOOLEAN('g', "call-graph", &call_graph,
 703                     "do call-graph (stack chain/backtrace) recording"),
 704         OPT_BOOLEAN('v', "verbose", &verbose,
 705                     "be more verbose (show counter open errors, etc)"),
 706         OPT_BOOLEAN('s', "stat", &inherit_stat,
 707                     "per thread counts"),
 708         OPT_BOOLEAN('d', "data", &sample_address,
 709                     "Sample addresses"),
 710         OPT_BOOLEAN('n', "no-samples", &no_samples,
 711                     "don't sample"),
 712         OPT_BOOLEAN('M', "multiplex", &multiplex,
 713                     "multiplex counter output in a single channel"),
 714         OPT_END()
 715 };
 716
 717 int cmd_record(int argc, const char **argv, const char *prefix __used)
 718 {
 719         int counter;
 720         int i,j;
 721
 722         argc = parse_options(argc, argv, options, record_usage,
 723                             PARSE_OPT_STOP_AT_NON_OPTION);
 724         if (!argc && target_pid == -1 && target_tid == -1 &&
 725                 !system_wide && profile_cpu == -1)
 726                 usage_with_options(record_usage, options);
 727
 728         symbol__init();
 729
 730         if (!nr_counters) {
 731                 nr_counters     = 1;
 732                 attrs[0].type   = PERF_TYPE_HARDWARE;
 733                 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
 734         }
 735
 736         if (target_pid != -1) {
 737                 target_tid = target_pid;
 738                 thread_num = find_all_tid(target_pid, &all_tids);
 739                 if (thread_num <= 0) {
 740                         fprintf(stderr, "Can't find all threads of pid %d\n",
 741                                         target_pid);
 742                         usage_with_options(record_usage, options);
 743                 }
 744         } else {
 745                 all_tids=malloc(sizeof(pid_t));
 746                 if (!all_tids)
 747                         return -ENOMEM;
 748
 749                 all_tids[0] = target_tid;
 750                 thread_num = 1;
 751         }
 752
 753         for (i = 0; i < MAX_NR_CPUS; i++) {
 754                 for (j = 0; j < MAX_COUNTERS; j++) {
 755                         fd[i][j] = malloc(sizeof(int)*thread_num);
 756                         mmap_array[i][j] = zalloc(
 757                                 sizeof(struct mmap_data)*thread_num);
 758                         if (!fd[i][j] || !mmap_array[i][j])
 759                                 return -ENOMEM;
 760                 }
 761         }
 762         event_array = malloc(
 763                 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
 764         if (!event_array)
 765                 return -ENOMEM;
 766
 767         /*
 768          * User specified count overrides default frequency.
 769          */
 770         if (default_interval)
 771                 freq = 0;
 772         else if (freq) {
 773                 default_interval = freq;
 774         } else {
 775                 fprintf(stderr, "frequency and count are zero, aborting\n");
 776                 exit(EXIT_FAILURE);
 777         }
 778
 779         for (counter = 0; counter < nr_counters; counter++) {
 780                 if (attrs[counter].sample_period)
 781                         continue;
 782
 783                 attrs[counter].sample_period = default_interval;
 784         }
 785
 786         return __cmd_record(argc, argv);
 787 }