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 enum write_mode_t {
  30         WRITE_FORCE,
  31         WRITE_APPEND
  32 };
  33
  34 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
  35
  36 static long                     default_interval                =      0;
  37
  38 static int                      nr_cpus                         =      0;
  39 static unsigned int             page_size;
  40 static unsigned int             mmap_pages                      =    128;
  41 static int                      freq                            =   1000;
  42 static int                      output;
  43 static const char               *output_name                    = "perf.data";
  44 static int                      group                           =      0;
  45 static unsigned int             realtime_prio                   =      0;
  46 static bool                     raw_samples                     =  false;
  47 static bool                     system_wide                     =  false;
  48 static int                      profile_cpu                     =     -1;
  49 static pid_t                    target_pid                      =     -1;
  50 static pid_t                    target_tid                      =     -1;
  51 static pid_t                    *all_tids                       =      NULL;
  52 static int                      thread_num                      =      0;
  53 static pid_t                    child_pid                       =     -1;
  54 static bool                     inherit                         =   true;
  55 static enum write_mode_t        write_mode                      = WRITE_FORCE;
  56 static bool                     call_graph                      =  false;
  57 static bool                     inherit_stat                    =  false;
  58 static bool                     no_samples                      =  false;
  59 static bool                     sample_address                  =  false;
  60 static bool                     multiplex                       =  false;
  61 static int                      multiplex_fd                    =     -1;
  62
  63 static long                     samples                         =      0;
  64 static struct timeval           last_read;
  65 static struct timeval           this_read;
  66
  67 static u64                      bytes_written                   =      0;
  68
  69 static struct pollfd            *event_array;
  70
  71 static int                      nr_poll                         =      0;
  72 static int                      nr_cpu                          =      0;
  73
  74 static int                      file_new                        =      1;
  75 static off_t                    post_processing_offset;
  76
  77 static struct perf_session      *session;
  78
  79 struct mmap_data {
  80         int                     counter;
  81         void                    *base;
  82         unsigned int            mask;
  83         unsigned int            prev;
  84 };
  85
  86 static struct mmap_data         *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
  87
  88 static unsigned long mmap_read_head(struct mmap_data *md)
  89 {
  90         struct perf_event_mmap_page *pc = md->base;
  91         long head;
  92
  93         head = pc->data_head;
  94         rmb();
  95
  96         return head;
  97 }
  98
  99 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
 100 {
 101         struct perf_event_mmap_page *pc = md->base;
 102
 103         /*
 104          * ensure all reads are done before we write the tail out.
 105          */
 106         /* mb(); */
 107         pc->data_tail = tail;
 108 }
 109
 110 static void write_output(void *buf, size_t size)
 111 {
 112         while (size) {
 113                 int ret = write(output, buf, size);
 114
 115                 if (ret < 0)
 116                         die("failed to write");
 117
 118                 size -= ret;
 119                 buf += ret;
 120
 121                 bytes_written += ret;
 122         }
 123 }
 124
 125 static int process_synthesized_event(event_t *event,
 126                                      struct perf_session *self __used)
 127 {
 128         write_output(event, event->header.size);
 129         return 0;
 130 }
 131
 132 static void mmap_read(struct mmap_data *md)
 133 {
 134         unsigned int head = mmap_read_head(md);
 135         unsigned int old = md->prev;
 136         unsigned char *data = md->base + page_size;
 137         unsigned long size;
 138         void *buf;
 139         int diff;
 140
 141         gettimeofday(&this_read, NULL);
 142
 143         /*
 144          * If we're further behind than half the buffer, there's a chance
 145          * the writer will bite our tail and mess up the samples under us.
 146          *
 147          * If we somehow ended up ahead of the head, we got messed up.
 148          *
 149          * In either case, truncate and restart at head.
 150          */
 151         diff = head - old;
 152         if (diff < 0) {
 153                 struct timeval iv;
 154                 unsigned long msecs;
 155
 156                 timersub(&this_read, &last_read, &iv);
 157                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
 158
 159                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
 160                                 "  Last read %lu msecs ago.\n", msecs);
 161
 162                 /*
 163                  * head points to a known good entry, start there.
 164                  */
 165                 old = head;
 166         }
 167
 168         last_read = this_read;
 169
 170         if (old != head)
 171                 samples++;
 172
 173         size = head - old;
 174
 175         if ((old & md->mask) + size != (head & md->mask)) {
 176                 buf = &data[old & md->mask];
 177                 size = md->mask + 1 - (old & md->mask);
 178                 old += size;
 179
 180                 write_output(buf, size);
 181         }
 182
 183         buf = &data[old & md->mask];
 184         size = head - old;
 185         old += size;
 186
 187         write_output(buf, size);
 188
 189         md->prev = old;
 190         mmap_write_tail(md, old);
 191 }
 192
 193 static volatile int done = 0;
 194 static volatile int signr = -1;
 195
 196 static void sig_handler(int sig)
 197 {
 198         done = 1;
 199         signr = sig;
 200 }
 201
 202 static void sig_atexit(void)
 203 {
 204         if (child_pid != -1)
 205                 kill(child_pid, SIGTERM);
 206
 207         if (signr == -1)
 208                 return;
 209
 210         signal(signr, SIG_DFL);
 211         kill(getpid(), signr);
 212 }
 213
 214 static int group_fd;
 215
 216 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 217 {
 218         struct perf_header_attr *h_attr;
 219
 220         if (nr < session->header.attrs) {
 221                 h_attr = session->header.attr[nr];
 222         } else {
 223                 h_attr = perf_header_attr__new(a);
 224                 if (h_attr != NULL)
 225                         if (perf_header__add_attr(&session->header, h_attr) < 0) {
 226                                 perf_header_attr__delete(h_attr);
 227                                 h_attr = NULL;
 228                         }
 229         }
 230
 231         return h_attr;
 232 }
 233
 234 static void create_counter(int counter, int cpu)
 235 {
 236         char *filter = filters[counter];
 237         struct perf_event_attr *attr = attrs + counter;
 238         struct perf_header_attr *h_attr;
 239         int track = !counter; /* only the first counter needs these */
 240         int thread_index;
 241         int ret;
 242         struct {
 243                 u64 count;
 244                 u64 time_enabled;
 245                 u64 time_running;
 246                 u64 id;
 247         } read_data;
 248
 249         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
 250                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
 251                                   PERF_FORMAT_ID;
 252
 253         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 254
 255         if (nr_counters > 1)
 256                 attr->sample_type |= PERF_SAMPLE_ID;
 257
 258         if (freq) {
 259                 attr->sample_type       |= PERF_SAMPLE_PERIOD;
 260                 attr->freq              = 1;
 261                 attr->sample_freq       = freq;
 262         }
 263
 264         if (no_samples)
 265                 attr->sample_freq = 0;
 266
 267         if (inherit_stat)
 268                 attr->inherit_stat = 1;
 269
 270         if (sample_address)
 271                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 272
 273         if (call_graph)
 274                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 275
 276         if (raw_samples) {
 277                 attr->sample_type       |= PERF_SAMPLE_TIME;
 278                 attr->sample_type       |= PERF_SAMPLE_RAW;
 279                 attr->sample_type       |= PERF_SAMPLE_CPU;
 280         }
 281
 282         attr->mmap              = track;
 283         attr->comm              = track;
 284         attr->inherit           = inherit;
 285         if (target_pid == -1 && !system_wide) {
 286                 attr->disabled = 1;
 287                 attr->enable_on_exec = 1;
 288         }
 289
 290         for (thread_index = 0; thread_index < thread_num; thread_index++) {
 291 try_again:
 292                 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
 293                                 all_tids[thread_index], cpu, group_fd, 0);
 294
 295                 if (fd[nr_cpu][counter][thread_index] < 0) {
 296                         int err = errno;
 297
 298                         if (err == EPERM || err == EACCES)
 299                                 die("Permission error - are you root?\n"
 300                                         "\t Consider tweaking"
 301                                         " /proc/sys/kernel/perf_event_paranoid.\n");
 302                         else if (err ==  ENODEV && profile_cpu != -1) {
 303                                 die("No such device - did you specify"
 304                                         " an out-of-range profile CPU?\n");
 305                         }
 306
 307                         /*
 308                          * If it's cycles then fall back to hrtimer
 309                          * based cpu-clock-tick sw counter, which
 310                          * is always available even if no PMU support:
 311                          */
 312                         if (attr->type == PERF_TYPE_HARDWARE
 313                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 314
 315                                 if (verbose)
 316                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
 317                                 attr->type = PERF_TYPE_SOFTWARE;
 318                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 319                                 goto try_again;
 320                         }
 321                         printf("\n");
 322                         error("perfcounter syscall returned with %d (%s)\n",
 323                                         fd[nr_cpu][counter][thread_index], strerror(err));
 324
 325 #if defined(__i386__) || defined(__x86_64__)
 326                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 327                                 die("No hardware sampling interrupt available."
 328                                     " No APIC? If so then you can boot the kernel"
 329                                     " with the \"lapic\" boot parameter to"
 330                                     " force-enable it.\n");
 331 #endif
 332
 333                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 334                         exit(-1);
 335                 }
 336
 337                 h_attr = get_header_attr(attr, counter);
 338                 if (h_attr == NULL)
 339                         die("nomem\n");
 340
 341                 if (!file_new) {
 342                         if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
 343                                 fprintf(stderr, "incompatible append\n");
 344                                 exit(-1);
 345                         }
 346                 }
 347
 348                 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
 349                         perror("Unable to read perf file descriptor\n");
 350                         exit(-1);
 351                 }
 352
 353                 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
 354                         pr_warning("Not enough memory to add id\n");
 355                         exit(-1);
 356                 }
 357
 358                 assert(fd[nr_cpu][counter][thread_index] >= 0);
 359                 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
 360
 361                 /*
 362                  * First counter acts as the group leader:
 363                  */
 364                 if (group && group_fd == -1)
 365                         group_fd = fd[nr_cpu][counter][thread_index];
 366                 if (multiplex && multiplex_fd == -1)
 367                         multiplex_fd = fd[nr_cpu][counter][thread_index];
 368
 369                 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
 370
 371                         ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
 372                         assert(ret != -1);
 373                 } else {
 374                         event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
 375                         event_array[nr_poll].events = POLLIN;
 376                         nr_poll++;
 377
 378                         mmap_array[nr_cpu][counter][thread_index].counter = counter;
 379                         mmap_array[nr_cpu][counter][thread_index].prev = 0;
 380                         mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
 381                         mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
 382                                 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
 383                         if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
 384                                 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
 385                                 exit(-1);
 386                         }
 387                 }
 388
 389                 if (filter != NULL) {
 390                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 391                                         PERF_EVENT_IOC_SET_FILTER, filter);
 392                         if (ret) {
 393                                 error("failed to set filter with %d (%s)\n", errno,
 394                                                 strerror(errno));
 395                                 exit(-1);
 396                         }
 397                 }
 398         }
 399 }
 400
 401 static void open_counters(int cpu)
 402 {
 403         int counter;
 404
 405         group_fd = -1;
 406         for (counter = 0; counter < nr_counters; counter++)
 407                 create_counter(counter, cpu);
 408
 409         nr_cpu++;
 410 }
 411
 412 static int process_buildids(void)
 413 {
 414         u64 size = lseek(output, 0, SEEK_CUR);
 415
 416         if (size == 0)
 417                 return 0;
 418
 419         session->fd = output;
 420         return __perf_session__process_events(session, post_processing_offset,
 421                                               size - post_processing_offset,
 422                                               size, &build_id__mark_dso_hit_ops);
 423 }
 424
 425 static void atexit_header(void)
 426 {
 427         session->header.data_size += bytes_written;
 428
 429         process_buildids();
 430         perf_header__write(&session->header, output, true);
 431 }
 432
 433 static int __cmd_record(int argc, const char **argv)
 434 {
 435         int i, counter;
 436         struct stat st;
 437         pid_t pid = 0;
 438         int flags;
 439         int err;
 440         unsigned long waking = 0;
 441         int child_ready_pipe[2], go_pipe[2];
 442         const bool forks = argc > 0;
 443         char buf;
 444
 445         page_size = sysconf(_SC_PAGE_SIZE);
 446
 447         atexit(sig_atexit);
 448         signal(SIGCHLD, sig_handler);
 449         signal(SIGINT, sig_handler);
 450
 451         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 452                 perror("failed to create pipes");
 453                 exit(-1);
 454         }
 455
 456         if (!stat(output_name, &st) && st.st_size) {
 457                 if (write_mode == WRITE_FORCE) {
 458                         char oldname[PATH_MAX];
 459                         snprintf(oldname, sizeof(oldname), "%s.old",
 460                                  output_name);
 461                         unlink(oldname);
 462                         rename(output_name, oldname);
 463                 }
 464         } else if (write_mode == WRITE_APPEND) {
 465                 write_mode = WRITE_FORCE;
 466         }
 467
 468         flags = O_CREAT|O_RDWR;
 469         if (write_mode == WRITE_APPEND)
 470                 file_new = 0;
 471         else
 472                 flags |= O_TRUNC;
 473
 474         output = open(output_name, flags, S_IRUSR|S_IWUSR);
 475         if (output < 0) {
 476                 perror("failed to create output file");
 477                 exit(-1);
 478         }
 479
 480         session = perf_session__new(output_name, O_WRONLY,
 481                                     write_mode == WRITE_FORCE);
 482         if (session == NULL) {
 483                 pr_err("Not enough memory for reading perf file header\n");
 484                 return -1;
 485         }
 486
 487         if (!file_new) {
 488                 err = perf_header__read(&session->header, output);
 489                 if (err < 0)
 490                         return err;
 491         }
 492
 493         if (raw_samples) {
 494                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 495         } else {
 496                 for (i = 0; i < nr_counters; i++) {
 497                         if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
 498                                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 499                                 break;
 500                         }
 501                 }
 502         }
 503
 504         atexit(atexit_header);
 505
 506         if (forks) {
 507                 child_pid = fork();
 508                 if (pid < 0) {
 509                         perror("failed to fork");
 510                         exit(-1);
 511                 }
 512
 513                 if (!child_pid) {
 514                         close(child_ready_pipe[0]);
 515                         close(go_pipe[1]);
 516                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 517
 518                         /*
 519                          * Do a dummy execvp to get the PLT entry resolved,
 520                          * so we avoid the resolver overhead on the real
 521                          * execvp call.
 522                          */
 523                         execvp("", (char **)argv);
 524
 525                         /*
 526                          * Tell the parent we're ready to go
 527                          */
 528                         close(child_ready_pipe[1]);
 529
 530                         /*
 531                          * Wait until the parent tells us to go.
 532                          */
 533                         if (read(go_pipe[0], &buf, 1) == -1)
 534                                 perror("unable to read pipe");
 535
 536                         execvp(argv[0], (char **)argv);
 537
 538                         perror(argv[0]);
 539                         exit(-1);
 540                 }
 541
 542                 if (!system_wide && target_tid == -1 && target_pid == -1)
 543                         all_tids[0] = child_pid;
 544
 545                 close(child_ready_pipe[1]);
 546                 close(go_pipe[0]);
 547                 /*
 548                  * wait for child to settle
 549                  */
 550                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
 551                         perror("unable to read pipe");
 552                         exit(-1);
 553                 }
 554                 close(child_ready_pipe[0]);
 555         }
 556
 557         if ((!system_wide && !inherit) || profile_cpu != -1) {
 558                 open_counters(profile_cpu);
 559         } else {
 560                 nr_cpus = read_cpu_map();
 561                 for (i = 0; i < nr_cpus; i++)
 562                         open_counters(cpumap[i]);
 563         }
 564
 565         if (file_new) {
 566                 err = perf_header__write(&session->header, output, false);
 567                 if (err < 0)
 568                         return err;
 569         }
 570
 571         post_processing_offset = lseek(output, 0, SEEK_CUR);
 572
 573         err = event__synthesize_kernel_mmap(process_synthesized_event,
 574                                             session, "_text");
 575         if (err < 0)
 576                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 577                                                     session, "_stext");
 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 bool force, append_file;
 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 (deprecated)"),
 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_INCR('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         if (force && append_file) {
 729                 fprintf(stderr, "Can't overwrite and append at the same time."
 730                                 " You need to choose between -f and -A");
 731                 usage_with_options(record_usage, options);
 732         } else if (append_file) {
 733                 write_mode = WRITE_APPEND;
 734         } else {
 735                 write_mode = WRITE_FORCE;
 736         }
 737
 738         symbol__init();
 739
 740         if (!nr_counters) {
 741                 nr_counters     = 1;
 742                 attrs[0].type   = PERF_TYPE_HARDWARE;
 743                 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
 744         }
 745
 746         if (target_pid != -1) {
 747                 target_tid = target_pid;
 748                 thread_num = find_all_tid(target_pid, &all_tids);
 749                 if (thread_num <= 0) {
 750                         fprintf(stderr, "Can't find all threads of pid %d\n",
 751                                         target_pid);
 752                         usage_with_options(record_usage, options);
 753                 }
 754         } else {
 755                 all_tids=malloc(sizeof(pid_t));
 756                 if (!all_tids)
 757                         return -ENOMEM;
 758
 759                 all_tids[0] = target_tid;
 760                 thread_num = 1;
 761         }
 762
 763         for (i = 0; i < MAX_NR_CPUS; i++) {
 764                 for (j = 0; j < MAX_COUNTERS; j++) {
 765                         fd[i][j] = malloc(sizeof(int)*thread_num);
 766                         mmap_array[i][j] = zalloc(
 767                                 sizeof(struct mmap_data)*thread_num);
 768                         if (!fd[i][j] || !mmap_array[i][j])
 769                                 return -ENOMEM;
 770                 }
 771         }
 772         event_array = malloc(
 773                 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
 774         if (!event_array)
 775                 return -ENOMEM;
 776
 777         /*
 778          * User specified count overrides default frequency.
 779          */
 780         if (default_interval)
 781                 freq = 0;
 782         else if (freq) {
 783                 default_interval = freq;
 784         } else {
 785                 fprintf(stderr, "frequency and count are zero, aborting\n");
 786                 exit(EXIT_FAILURE);
 787         }
 788
 789         for (counter = 0; counter < nr_counters; counter++) {
 790                 if (attrs[counter].sample_period)
 791                         continue;
 792
 793                 attrs[counter].sample_period = default_interval;
 794         }
 795
 796         return __cmd_record(argc, argv);
 797 }