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 enum write_mode_t {
  30         WRITE_FORCE,
  31         WRITE_APPEND
  32 };
  33
  34 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
  35
  36 static unsigned int             user_interval                   = UINT_MAX;
  37 static long                     default_interval                =      0;
  38
  39 static int                      nr_cpus                         =      0;
  40 static unsigned int             page_size;
  41 static unsigned int             mmap_pages                      =    128;
  42 static unsigned int             user_freq                       = UINT_MAX;
  43 static int                      freq                            =   1000;
  44 static int                      output;
  45 static const char               *output_name                    = "perf.data";
  46 static int                      group                           =      0;
  47 static unsigned int             realtime_prio                   =      0;
  48 static bool                     raw_samples                     =  false;
  49 static bool                     system_wide                     =  false;
  50 static int                      profile_cpu                     =     -1;
  51 static pid_t                    target_pid                      =     -1;
  52 static pid_t                    target_tid                      =     -1;
  53 static pid_t                    *all_tids                       =      NULL;
  54 static int                      thread_num                      =      0;
  55 static pid_t                    child_pid                       =     -1;
  56 static bool                     inherit                         =   true;
  57 static enum write_mode_t        write_mode                      = WRITE_FORCE;
  58 static bool                     call_graph                      =  false;
  59 static bool                     inherit_stat                    =  false;
  60 static bool                     no_samples                      =  false;
  61 static bool                     sample_address                  =  false;
  62 static bool                     multiplex                       =  false;
  63 static int                      multiplex_fd                    =     -1;
  64
  65 static long                     samples                         =      0;
  66 static struct timeval           last_read;
  67 static struct timeval           this_read;
  68
  69 static u64                      bytes_written                   =      0;
  70
  71 static struct pollfd            *event_array;
  72
  73 static int                      nr_poll                         =      0;
  74 static int                      nr_cpu                          =      0;
  75
  76 static int                      file_new                        =      1;
  77 static off_t                    post_processing_offset;
  78
  79 static struct perf_session      *session;
  80
  81 struct mmap_data {
  82         int                     counter;
  83         void                    *base;
  84         unsigned int            mask;
  85         unsigned int            prev;
  86 };
  87
  88 static struct mmap_data         *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
  89
  90 static unsigned long mmap_read_head(struct mmap_data *md)
  91 {
  92         struct perf_event_mmap_page *pc = md->base;
  93         long head;
  94
  95         head = pc->data_head;
  96         rmb();
  97
  98         return head;
  99 }
 100
 101 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
 102 {
 103         struct perf_event_mmap_page *pc = md->base;
 104
 105         /*
 106          * ensure all reads are done before we write the tail out.
 107          */
 108         /* mb(); */
 109         pc->data_tail = tail;
 110 }
 111
 112 static void write_output(void *buf, size_t size)
 113 {
 114         while (size) {
 115                 int ret = write(output, buf, size);
 116
 117                 if (ret < 0)
 118                         die("failed to write");
 119
 120                 size -= ret;
 121                 buf += ret;
 122
 123                 bytes_written += ret;
 124         }
 125 }
 126
 127 static int process_synthesized_event(event_t *event,
 128                                      struct perf_session *self __used)
 129 {
 130         write_output(event, event->header.size);
 131         return 0;
 132 }
 133
 134 static void mmap_read(struct mmap_data *md)
 135 {
 136         unsigned int head = mmap_read_head(md);
 137         unsigned int old = md->prev;
 138         unsigned char *data = md->base + page_size;
 139         unsigned long size;
 140         void *buf;
 141         int diff;
 142
 143         gettimeofday(&this_read, NULL);
 144
 145         /*
 146          * If we're further behind than half the buffer, there's a chance
 147          * the writer will bite our tail and mess up the samples under us.
 148          *
 149          * If we somehow ended up ahead of the head, we got messed up.
 150          *
 151          * In either case, truncate and restart at head.
 152          */
 153         diff = head - old;
 154         if (diff < 0) {
 155                 struct timeval iv;
 156                 unsigned long msecs;
 157
 158                 timersub(&this_read, &last_read, &iv);
 159                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
 160
 161                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
 162                                 "  Last read %lu msecs ago.\n", msecs);
 163
 164                 /*
 165                  * head points to a known good entry, start there.
 166                  */
 167                 old = head;
 168         }
 169
 170         last_read = this_read;
 171
 172         if (old != head)
 173                 samples++;
 174
 175         size = head - old;
 176
 177         if ((old & md->mask) + size != (head & md->mask)) {
 178                 buf = &data[old & md->mask];
 179                 size = md->mask + 1 - (old & md->mask);
 180                 old += size;
 181
 182                 write_output(buf, size);
 183         }
 184
 185         buf = &data[old & md->mask];
 186         size = head - old;
 187         old += size;
 188
 189         write_output(buf, size);
 190
 191         md->prev = old;
 192         mmap_write_tail(md, old);
 193 }
 194
 195 static volatile int done = 0;
 196 static volatile int signr = -1;
 197
 198 static void sig_handler(int sig)
 199 {
 200         done = 1;
 201         signr = sig;
 202 }
 203
 204 static void sig_atexit(void)
 205 {
 206         if (child_pid != -1)
 207                 kill(child_pid, SIGTERM);
 208
 209         if (signr == -1)
 210                 return;
 211
 212         signal(signr, SIG_DFL);
 213         kill(getpid(), signr);
 214 }
 215
 216 static int group_fd;
 217
 218 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 219 {
 220         struct perf_header_attr *h_attr;
 221
 222         if (nr < session->header.attrs) {
 223                 h_attr = session->header.attr[nr];
 224         } else {
 225                 h_attr = perf_header_attr__new(a);
 226                 if (h_attr != NULL)
 227                         if (perf_header__add_attr(&session->header, h_attr) < 0) {
 228                                 perf_header_attr__delete(h_attr);
 229                                 h_attr = NULL;
 230                         }
 231         }
 232
 233         return h_attr;
 234 }
 235
 236 static void create_counter(int counter, int cpu)
 237 {
 238         char *filter = filters[counter];
 239         struct perf_event_attr *attr = attrs + counter;
 240         struct perf_header_attr *h_attr;
 241         int track = !counter; /* only the first counter needs these */
 242         int thread_index;
 243         int ret;
 244         struct {
 245                 u64 count;
 246                 u64 time_enabled;
 247                 u64 time_running;
 248                 u64 id;
 249         } read_data;
 250
 251         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
 252                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
 253                                   PERF_FORMAT_ID;
 254
 255         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 256
 257         if (nr_counters > 1)
 258                 attr->sample_type |= PERF_SAMPLE_ID;
 259
 260         /*
 261          * We default some events to a 1 default interval. But keep
 262          * it a weak assumption overridable by the user.
 263          */
 264         if (!attr->sample_period || (user_freq != UINT_MAX &&
 265                                      user_interval != UINT_MAX)) {
 266                 if (freq) {
 267                         attr->sample_type       |= PERF_SAMPLE_PERIOD;
 268                         attr->freq              = 1;
 269                         attr->sample_freq       = freq;
 270                 } else {
 271                         attr->sample_period = default_interval;
 272                 }
 273         }
 274
 275         if (no_samples)
 276                 attr->sample_freq = 0;
 277
 278         if (inherit_stat)
 279                 attr->inherit_stat = 1;
 280
 281         if (sample_address)
 282                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 283
 284         if (call_graph)
 285                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 286
 287         if (raw_samples) {
 288                 attr->sample_type       |= PERF_SAMPLE_TIME;
 289                 attr->sample_type       |= PERF_SAMPLE_RAW;
 290                 attr->sample_type       |= PERF_SAMPLE_CPU;
 291         }
 292
 293         attr->mmap              = track;
 294         attr->comm              = track;
 295         attr->inherit           = inherit;
 296         if (target_pid == -1 && !system_wide) {
 297                 attr->disabled = 1;
 298                 attr->enable_on_exec = 1;
 299         }
 300
 301         for (thread_index = 0; thread_index < thread_num; thread_index++) {
 302 try_again:
 303                 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
 304                                 all_tids[thread_index], cpu, group_fd, 0);
 305
 306                 if (fd[nr_cpu][counter][thread_index] < 0) {
 307                         int err = errno;
 308
 309                         if (err == EPERM || err == EACCES)
 310                                 die("Permission error - are you root?\n"
 311                                         "\t Consider tweaking"
 312                                         " /proc/sys/kernel/perf_event_paranoid.\n");
 313                         else if (err ==  ENODEV && profile_cpu != -1) {
 314                                 die("No such device - did you specify"
 315                                         " an out-of-range profile CPU?\n");
 316                         }
 317
 318                         /*
 319                          * If it's cycles then fall back to hrtimer
 320                          * based cpu-clock-tick sw counter, which
 321                          * is always available even if no PMU support:
 322                          */
 323                         if (attr->type == PERF_TYPE_HARDWARE
 324                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 325
 326                                 if (verbose)
 327                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
 328                                 attr->type = PERF_TYPE_SOFTWARE;
 329                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 330                                 goto try_again;
 331                         }
 332                         printf("\n");
 333                         error("perfcounter syscall returned with %d (%s)\n",
 334                                         fd[nr_cpu][counter][thread_index], strerror(err));
 335
 336 #if defined(__i386__) || defined(__x86_64__)
 337                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 338                                 die("No hardware sampling interrupt available."
 339                                     " No APIC? If so then you can boot the kernel"
 340                                     " with the \"lapic\" boot parameter to"
 341                                     " force-enable it.\n");
 342 #endif
 343
 344                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 345                         exit(-1);
 346                 }
 347
 348                 h_attr = get_header_attr(attr, counter);
 349                 if (h_attr == NULL)
 350                         die("nomem\n");
 351
 352                 if (!file_new) {
 353                         if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
 354                                 fprintf(stderr, "incompatible append\n");
 355                                 exit(-1);
 356                         }
 357                 }
 358
 359                 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
 360                         perror("Unable to read perf file descriptor\n");
 361                         exit(-1);
 362                 }
 363
 364                 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
 365                         pr_warning("Not enough memory to add id\n");
 366                         exit(-1);
 367                 }
 368
 369                 assert(fd[nr_cpu][counter][thread_index] >= 0);
 370                 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
 371
 372                 /*
 373                  * First counter acts as the group leader:
 374                  */
 375                 if (group && group_fd == -1)
 376                         group_fd = fd[nr_cpu][counter][thread_index];
 377                 if (multiplex && multiplex_fd == -1)
 378                         multiplex_fd = fd[nr_cpu][counter][thread_index];
 379
 380                 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
 381
 382                         ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
 383                         assert(ret != -1);
 384                 } else {
 385                         event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
 386                         event_array[nr_poll].events = POLLIN;
 387                         nr_poll++;
 388
 389                         mmap_array[nr_cpu][counter][thread_index].counter = counter;
 390                         mmap_array[nr_cpu][counter][thread_index].prev = 0;
 391                         mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
 392                         mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
 393                                 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
 394                         if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
 395                                 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
 396                                 exit(-1);
 397                         }
 398                 }
 399
 400                 if (filter != NULL) {
 401                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 402                                         PERF_EVENT_IOC_SET_FILTER, filter);
 403                         if (ret) {
 404                                 error("failed to set filter with %d (%s)\n", errno,
 405                                                 strerror(errno));
 406                                 exit(-1);
 407                         }
 408                 }
 409         }
 410 }
 411
 412 static void open_counters(int cpu)
 413 {
 414         int counter;
 415
 416         group_fd = -1;
 417         for (counter = 0; counter < nr_counters; counter++)
 418                 create_counter(counter, cpu);
 419
 420         nr_cpu++;
 421 }
 422
 423 static int process_buildids(void)
 424 {
 425         u64 size = lseek(output, 0, SEEK_CUR);
 426
 427         if (size == 0)
 428                 return 0;
 429
 430         session->fd = output;
 431         return __perf_session__process_events(session, post_processing_offset,
 432                                               size - post_processing_offset,
 433                                               size, &build_id__mark_dso_hit_ops);
 434 }
 435
 436 static void atexit_header(void)
 437 {
 438         session->header.data_size += bytes_written;
 439
 440         process_buildids();
 441         perf_header__write(&session->header, output, true);
 442 }
 443
 444 static int __cmd_record(int argc, const char **argv)
 445 {
 446         int i, counter;
 447         struct stat st;
 448         pid_t pid = 0;
 449         int flags;
 450         int err;
 451         unsigned long waking = 0;
 452         int child_ready_pipe[2], go_pipe[2];
 453         const bool forks = argc > 0;
 454         char buf;
 455
 456         page_size = sysconf(_SC_PAGE_SIZE);
 457
 458         atexit(sig_atexit);
 459         signal(SIGCHLD, sig_handler);
 460         signal(SIGINT, sig_handler);
 461
 462         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 463                 perror("failed to create pipes");
 464                 exit(-1);
 465         }
 466
 467         if (!stat(output_name, &st) && st.st_size) {
 468                 if (write_mode == WRITE_FORCE) {
 469                         char oldname[PATH_MAX];
 470                         snprintf(oldname, sizeof(oldname), "%s.old",
 471                                  output_name);
 472                         unlink(oldname);
 473                         rename(output_name, oldname);
 474                 }
 475         } else if (write_mode == WRITE_APPEND) {
 476                 write_mode = WRITE_FORCE;
 477         }
 478
 479         flags = O_CREAT|O_RDWR;
 480         if (write_mode == WRITE_APPEND)
 481                 file_new = 0;
 482         else
 483                 flags |= O_TRUNC;
 484
 485         output = open(output_name, flags, S_IRUSR|S_IWUSR);
 486         if (output < 0) {
 487                 perror("failed to create output file");
 488                 exit(-1);
 489         }
 490
 491         session = perf_session__new(output_name, O_WRONLY,
 492                                     write_mode == WRITE_FORCE);
 493         if (session == NULL) {
 494                 pr_err("Not enough memory for reading perf file header\n");
 495                 return -1;
 496         }
 497
 498         if (!file_new) {
 499                 err = perf_header__read(&session->header, output);
 500                 if (err < 0)
 501                         return err;
 502         }
 503
 504         if (raw_samples) {
 505                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 506         } else {
 507                 for (i = 0; i < nr_counters; i++) {
 508                         if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
 509                                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 510                                 break;
 511                         }
 512                 }
 513         }
 514
 515         atexit(atexit_header);
 516
 517         if (forks) {
 518                 child_pid = fork();
 519                 if (pid < 0) {
 520                         perror("failed to fork");
 521                         exit(-1);
 522                 }
 523
 524                 if (!child_pid) {
 525                         close(child_ready_pipe[0]);
 526                         close(go_pipe[1]);
 527                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 528
 529                         /*
 530                          * Do a dummy execvp to get the PLT entry resolved,
 531                          * so we avoid the resolver overhead on the real
 532                          * execvp call.
 533                          */
 534                         execvp("", (char **)argv);
 535
 536                         /*
 537                          * Tell the parent we're ready to go
 538                          */
 539                         close(child_ready_pipe[1]);
 540
 541                         /*
 542                          * Wait until the parent tells us to go.
 543                          */
 544                         if (read(go_pipe[0], &buf, 1) == -1)
 545                                 perror("unable to read pipe");
 546
 547                         execvp(argv[0], (char **)argv);
 548
 549                         perror(argv[0]);
 550                         exit(-1);
 551                 }
 552
 553                 if (!system_wide && target_tid == -1 && target_pid == -1)
 554                         all_tids[0] = child_pid;
 555
 556                 close(child_ready_pipe[1]);
 557                 close(go_pipe[0]);
 558                 /*
 559                  * wait for child to settle
 560                  */
 561                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
 562                         perror("unable to read pipe");
 563                         exit(-1);
 564                 }
 565                 close(child_ready_pipe[0]);
 566         }
 567
 568         if ((!system_wide && !inherit) || profile_cpu != -1) {
 569                 open_counters(profile_cpu);
 570         } else {
 571                 nr_cpus = read_cpu_map();
 572                 for (i = 0; i < nr_cpus; i++)
 573                         open_counters(cpumap[i]);
 574         }
 575
 576         if (file_new) {
 577                 err = perf_header__write(&session->header, output, false);
 578                 if (err < 0)
 579                         return err;
 580         }
 581
 582         post_processing_offset = lseek(output, 0, SEEK_CUR);
 583
 584         err = event__synthesize_kernel_mmap(process_synthesized_event,
 585                                             session, "_text");
 586         if (err < 0)
 587                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 588                                                     session, "_stext");
 589         if (err < 0) {
 590                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 591                 return err;
 592         }
 593
 594         err = event__synthesize_modules(process_synthesized_event, session);
 595         if (err < 0) {
 596                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 597                 return err;
 598         }
 599
 600         if (!system_wide && profile_cpu == -1)
 601                 event__synthesize_thread(target_tid, process_synthesized_event,
 602                                          session);
 603         else
 604                 event__synthesize_threads(process_synthesized_event, session);
 605
 606         if (realtime_prio) {
 607                 struct sched_param param;
 608
 609                 param.sched_priority = realtime_prio;
 610                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 611                         pr_err("Could not set realtime priority.\n");
 612                         exit(-1);
 613                 }
 614         }
 615
 616         /*
 617          * Let the child rip
 618          */
 619         if (forks)
 620                 close(go_pipe[1]);
 621
 622         for (;;) {
 623                 int hits = samples;
 624                 int thread;
 625
 626                 for (i = 0; i < nr_cpu; i++) {
 627                         for (counter = 0; counter < nr_counters; counter++) {
 628                                 for (thread = 0;
 629                                         thread < thread_num; thread++) {
 630                                         if (mmap_array[i][counter][thread].base)
 631                                                 mmap_read(&mmap_array[i][counter][thread]);
 632                                 }
 633
 634                         }
 635                 }
 636
 637                 if (hits == samples) {
 638                         if (done)
 639                                 break;
 640                         err = poll(event_array, nr_poll, -1);
 641                         waking++;
 642                 }
 643
 644                 if (done) {
 645                         for (i = 0; i < nr_cpu; i++) {
 646                                 for (counter = 0;
 647                                         counter < nr_counters;
 648                                         counter++) {
 649                                         for (thread = 0;
 650                                                 thread < thread_num;
 651                                                 thread++)
 652                                                 ioctl(fd[i][counter][thread],
 653                                                         PERF_EVENT_IOC_DISABLE);
 654                                 }
 655                         }
 656                 }
 657         }
 658
 659         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 660
 661         /*
 662          * Approximate RIP event size: 24 bytes.
 663          */
 664         fprintf(stderr,
 665                 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
 666                 (double)bytes_written / 1024.0 / 1024.0,
 667                 output_name,
 668                 bytes_written / 24);
 669
 670         return 0;
 671 }
 672
 673 static const char * const record_usage[] = {
 674         "perf record [<options>] [<command>]",
 675         "perf record [<options>] -- <command> [<options>]",
 676         NULL
 677 };
 678
 679 static bool force, append_file;
 680
 681 static const struct option options[] = {
 682         OPT_CALLBACK('e', "event", NULL, "event",
 683                      "event selector. use 'perf list' to list available events",
 684                      parse_events),
 685         OPT_CALLBACK(0, "filter", NULL, "filter",
 686                      "event filter", parse_filter),
 687         OPT_INTEGER('p', "pid", &target_pid,
 688                     "record events on existing process id"),
 689         OPT_INTEGER('t', "tid", &target_tid,
 690                     "record events on existing thread id"),
 691         OPT_INTEGER('r', "realtime", &realtime_prio,
 692                     "collect data with this RT SCHED_FIFO priority"),
 693         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
 694                     "collect raw sample records from all opened counters"),
 695         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 696                             "system-wide collection from all CPUs"),
 697         OPT_BOOLEAN('A', "append", &append_file,
 698                             "append to the output file to do incremental profiling"),
 699         OPT_INTEGER('C', "profile_cpu", &profile_cpu,
 700                             "CPU to profile on"),
 701         OPT_BOOLEAN('f', "force", &force,
 702                         "overwrite existing data file (deprecated)"),
 703         OPT_LONG('c', "count", &user_interval,
 704                     "event period to sample"),
 705         OPT_STRING('o', "output", &output_name, "file",
 706                     "output file name"),
 707         OPT_BOOLEAN('i', "inherit", &inherit,
 708                     "child tasks inherit counters"),
 709         OPT_INTEGER('F', "freq", &user_freq,
 710                     "profile at this frequency"),
 711         OPT_INTEGER('m', "mmap-pages", &mmap_pages,
 712                     "number of mmap data pages"),
 713         OPT_BOOLEAN('g', "call-graph", &call_graph,
 714                     "do call-graph (stack chain/backtrace) recording"),
 715         OPT_INCR('v', "verbose", &verbose,
 716                     "be more verbose (show counter open errors, etc)"),
 717         OPT_BOOLEAN('s', "stat", &inherit_stat,
 718                     "per thread counts"),
 719         OPT_BOOLEAN('d', "data", &sample_address,
 720                     "Sample addresses"),
 721         OPT_BOOLEAN('n', "no-samples", &no_samples,
 722                     "don't sample"),
 723         OPT_BOOLEAN('M', "multiplex", &multiplex,
 724                     "multiplex counter output in a single channel"),
 725         OPT_END()
 726 };
 727
 728 int cmd_record(int argc, const char **argv, const char *prefix __used)
 729 {
 730         int i,j;
 731
 732         argc = parse_options(argc, argv, options, record_usage,
 733                             PARSE_OPT_STOP_AT_NON_OPTION);
 734         if (!argc && target_pid == -1 && target_tid == -1 &&
 735                 !system_wide && profile_cpu == -1)
 736                 usage_with_options(record_usage, options);
 737
 738         if (force && append_file) {
 739                 fprintf(stderr, "Can't overwrite and append at the same time."
 740                                 " You need to choose between -f and -A");
 741                 usage_with_options(record_usage, options);
 742         } else if (append_file) {
 743                 write_mode = WRITE_APPEND;
 744         } else {
 745                 write_mode = WRITE_FORCE;
 746         }
 747
 748         symbol__init();
 749
 750         if (!nr_counters) {
 751                 nr_counters     = 1;
 752                 attrs[0].type   = PERF_TYPE_HARDWARE;
 753                 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
 754         }
 755
 756         if (target_pid != -1) {
 757                 target_tid = target_pid;
 758                 thread_num = find_all_tid(target_pid, &all_tids);
 759                 if (thread_num <= 0) {
 760                         fprintf(stderr, "Can't find all threads of pid %d\n",
 761                                         target_pid);
 762                         usage_with_options(record_usage, options);
 763                 }
 764         } else {
 765                 all_tids=malloc(sizeof(pid_t));
 766                 if (!all_tids)
 767                         return -ENOMEM;
 768
 769                 all_tids[0] = target_tid;
 770                 thread_num = 1;
 771         }
 772
 773         for (i = 0; i < MAX_NR_CPUS; i++) {
 774                 for (j = 0; j < MAX_COUNTERS; j++) {
 775                         fd[i][j] = malloc(sizeof(int)*thread_num);
 776                         mmap_array[i][j] = zalloc(
 777                                 sizeof(struct mmap_data)*thread_num);
 778                         if (!fd[i][j] || !mmap_array[i][j])
 779                                 return -ENOMEM;
 780                 }
 781         }
 782         event_array = malloc(
 783                 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
 784         if (!event_array)
 785                 return -ENOMEM;
 786
 787         if (user_interval != UINT_MAX)
 788                 default_interval = user_interval;
 789         if (user_freq != UINT_MAX)
 790                 freq = user_freq;
 791
 792         /*
 793          * User specified count overrides default frequency.
 794          */
 795         if (default_interval)
 796                 freq = 0;
 797         else if (freq) {
 798                 default_interval = freq;
 799         } else {
 800                 fprintf(stderr, "frequency and count are zero, aborting\n");
 801                 exit(EXIT_FAILURE);
 802         }
 803
 804         return __cmd_record(argc, argv);
 805 }