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 #include <sys/mman.h>
  29
  30 enum write_mode_t {
  31         WRITE_FORCE,
  32         WRITE_APPEND
  33 };
  34
  35 static int                      *fd[MAX_NR_CPUS][MAX_COUNTERS];
  36
  37 static u64                      user_interval                   = ULLONG_MAX;
  38 static u64                      default_interval                =      0;
  39
  40 static int                      nr_cpus                         =      0;
  41 static unsigned int             page_size;
  42 static unsigned int             mmap_pages                      =    128;
  43 static unsigned int             user_freq                       = UINT_MAX;
  44 static int                      freq                            =   1000;
  45 static int                      output;
  46 static int                      pipe_output                     =      0;
  47 static const char               *output_name                    = "perf.data";
  48 static int                      group                           =      0;
  49 static int                      realtime_prio                   =      0;
  50 static bool                     raw_samples                     =  false;
  51 static bool                     system_wide                     =  false;
  52 static pid_t                    target_pid                      =     -1;
  53 static pid_t                    target_tid                      =     -1;
  54 static pid_t                    *all_tids                       =      NULL;
  55 static int                      thread_num                      =      0;
  56 static pid_t                    child_pid                       =     -1;
  57 static bool                     no_inherit                      =  false;
  58 static enum write_mode_t        write_mode                      = WRITE_FORCE;
  59 static bool                     call_graph                      =  false;
  60 static bool                     inherit_stat                    =  false;
  61 static bool                     no_samples                      =  false;
  62 static bool                     sample_address                  =  false;
  63
  64 static long                     samples                         =      0;
  65 static u64                      bytes_written                   =      0;
  66
  67 static struct pollfd            *event_array;
  68
  69 static int                      nr_poll                         =      0;
  70 static int                      nr_cpu                          =      0;
  71
  72 static int                      file_new                        =      1;
  73 static off_t                    post_processing_offset;
  74
  75 static struct perf_session      *session;
  76 static const char               *cpu_list;
  77
  78 struct mmap_data {
  79         int                     counter;
  80         void                    *base;
  81         unsigned int            mask;
  82         unsigned int            prev;
  83 };
  84
  85 static struct mmap_data         mmap_array[MAX_NR_CPUS];
  86
  87 static unsigned long mmap_read_head(struct mmap_data *md)
  88 {
  89         struct perf_event_mmap_page *pc = md->base;
  90         long head;
  91
  92         head = pc->data_head;
  93         rmb();
  94
  95         return head;
  96 }
  97
  98 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
  99 {
 100         struct perf_event_mmap_page *pc = md->base;
 101
 102         /*
 103          * ensure all reads are done before we write the tail out.
 104          */
 105         /* mb(); */
 106         pc->data_tail = tail;
 107 }
 108
 109 static void advance_output(size_t size)
 110 {
 111         bytes_written += size;
 112 }
 113
 114 static void write_output(void *buf, size_t size)
 115 {
 116         while (size) {
 117                 int ret = write(output, buf, size);
 118
 119                 if (ret < 0)
 120                         die("failed to write");
 121
 122                 size -= ret;
 123                 buf += ret;
 124
 125                 bytes_written += ret;
 126         }
 127 }
 128
 129 static int process_synthesized_event(event_t *event,
 130                                      struct perf_session *self __used)
 131 {
 132         write_output(event, event->header.size);
 133         return 0;
 134 }
 135
 136 static void mmap_read(struct mmap_data *md)
 137 {
 138         unsigned int head = mmap_read_head(md);
 139         unsigned int old = md->prev;
 140         unsigned char *data = md->base + page_size;
 141         unsigned long size;
 142         void *buf;
 143         int diff;
 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                 fprintf(stderr, "WARNING: failed to keep up with mmap data\n");
 156                 /*
 157                  * head points to a known good entry, start there.
 158                  */
 159                 old = head;
 160         }
 161
 162         if (old != head)
 163                 samples++;
 164
 165         size = head - old;
 166
 167         if ((old & md->mask) + size != (head & md->mask)) {
 168                 buf = &data[old & md->mask];
 169                 size = md->mask + 1 - (old & md->mask);
 170                 old += size;
 171
 172                 write_output(buf, size);
 173         }
 174
 175         buf = &data[old & md->mask];
 176         size = head - old;
 177         old += size;
 178
 179         write_output(buf, size);
 180
 181         md->prev = old;
 182         mmap_write_tail(md, old);
 183 }
 184
 185 static volatile int done = 0;
 186 static volatile int signr = -1;
 187
 188 static void sig_handler(int sig)
 189 {
 190         done = 1;
 191         signr = sig;
 192 }
 193
 194 static void sig_atexit(void)
 195 {
 196         if (child_pid != -1)
 197                 kill(child_pid, SIGTERM);
 198
 199         if (signr == -1)
 200                 return;
 201
 202         signal(signr, SIG_DFL);
 203         kill(getpid(), signr);
 204 }
 205
 206 static int group_fd;
 207
 208 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 209 {
 210         struct perf_header_attr *h_attr;
 211
 212         if (nr < session->header.attrs) {
 213                 h_attr = session->header.attr[nr];
 214         } else {
 215                 h_attr = perf_header_attr__new(a);
 216                 if (h_attr != NULL)
 217                         if (perf_header__add_attr(&session->header, h_attr) < 0) {
 218                                 perf_header_attr__delete(h_attr);
 219                                 h_attr = NULL;
 220                         }
 221         }
 222
 223         return h_attr;
 224 }
 225
 226 static void create_counter(int counter, int cpu)
 227 {
 228         char *filter = filters[counter];
 229         struct perf_event_attr *attr = attrs + counter;
 230         struct perf_header_attr *h_attr;
 231         int track = !counter; /* only the first counter needs these */
 232         int thread_index;
 233         int ret;
 234         struct {
 235                 u64 count;
 236                 u64 time_enabled;
 237                 u64 time_running;
 238                 u64 id;
 239         } read_data;
 240
 241         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
 242                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
 243                                   PERF_FORMAT_ID;
 244
 245         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 246
 247         if (nr_counters > 1)
 248                 attr->sample_type |= PERF_SAMPLE_ID;
 249
 250         /*
 251          * We default some events to a 1 default interval. But keep
 252          * it a weak assumption overridable by the user.
 253          */
 254         if (!attr->sample_period || (user_freq != UINT_MAX &&
 255                                      user_interval != ULLONG_MAX)) {
 256                 if (freq) {
 257                         attr->sample_type       |= PERF_SAMPLE_PERIOD;
 258                         attr->freq              = 1;
 259                         attr->sample_freq       = freq;
 260                 } else {
 261                         attr->sample_period = default_interval;
 262                 }
 263         }
 264
 265         if (no_samples)
 266                 attr->sample_freq = 0;
 267
 268         if (inherit_stat)
 269                 attr->inherit_stat = 1;
 270
 271         if (sample_address)
 272                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 273
 274         if (call_graph)
 275                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 276
 277         if (system_wide)
 278                 attr->sample_type       |= PERF_SAMPLE_CPU;
 279
 280         if (raw_samples) {
 281                 attr->sample_type       |= PERF_SAMPLE_TIME;
 282                 attr->sample_type       |= PERF_SAMPLE_RAW;
 283                 attr->sample_type       |= PERF_SAMPLE_CPU;
 284         }
 285
 286         attr->mmap              = track;
 287         attr->comm              = track;
 288         attr->inherit           = !no_inherit;
 289         if (target_pid == -1 && target_tid == -1 && !system_wide) {
 290                 attr->disabled = 1;
 291                 attr->enable_on_exec = 1;
 292         }
 293
 294         for (thread_index = 0; thread_index < thread_num; thread_index++) {
 295 try_again:
 296                 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
 297                                 all_tids[thread_index], cpu, group_fd, 0);
 298
 299                 if (fd[nr_cpu][counter][thread_index] < 0) {
 300                         int err = errno;
 301
 302                         if (err == EPERM || err == EACCES)
 303                                 die("Permission error - are you root?\n"
 304                                         "\t Consider tweaking"
 305                                         " /proc/sys/kernel/perf_event_paranoid.\n");
 306                         else if (err ==  ENODEV && cpu_list) {
 307                                 die("No such device - did you specify"
 308                                         " an out-of-range profile CPU?\n");
 309                         }
 310
 311                         /*
 312                          * If it's cycles then fall back to hrtimer
 313                          * based cpu-clock-tick sw counter, which
 314                          * is always available even if no PMU support:
 315                          */
 316                         if (attr->type == PERF_TYPE_HARDWARE
 317                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 318
 319                                 if (verbose)
 320                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
 321                                 attr->type = PERF_TYPE_SOFTWARE;
 322                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 323                                 goto try_again;
 324                         }
 325                         printf("\n");
 326                         error("perfcounter syscall returned with %d (%s)\n",
 327                                         fd[nr_cpu][counter][thread_index], strerror(err));
 328
 329 #if defined(__i386__) || defined(__x86_64__)
 330                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 331                                 die("No hardware sampling interrupt available."
 332                                     " No APIC? If so then you can boot the kernel"
 333                                     " with the \"lapic\" boot parameter to"
 334                                     " force-enable it.\n");
 335 #endif
 336
 337                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 338                         exit(-1);
 339                 }
 340
 341                 h_attr = get_header_attr(attr, counter);
 342                 if (h_attr == NULL)
 343                         die("nomem\n");
 344
 345                 if (!file_new) {
 346                         if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
 347                                 fprintf(stderr, "incompatible append\n");
 348                                 exit(-1);
 349                         }
 350                 }
 351
 352                 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
 353                         perror("Unable to read perf file descriptor\n");
 354                         exit(-1);
 355                 }
 356
 357                 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
 358                         pr_warning("Not enough memory to add id\n");
 359                         exit(-1);
 360                 }
 361
 362                 assert(fd[nr_cpu][counter][thread_index] >= 0);
 363                 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
 364
 365                 /*
 366                  * First counter acts as the group leader:
 367                  */
 368                 if (group && group_fd == -1)
 369                         group_fd = fd[nr_cpu][counter][thread_index];
 370
 371                 if (counter || thread_index) {
 372                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 373                                         PERF_EVENT_IOC_SET_OUTPUT,
 374                                         fd[nr_cpu][0][0]);
 375                         if (ret) {
 376                                 error("failed to set output: %d (%s)\n", errno,
 377                                                 strerror(errno));
 378                                 exit(-1);
 379                         }
 380                 } else {
 381                         mmap_array[nr_cpu].counter = counter;
 382                         mmap_array[nr_cpu].prev = 0;
 383                         mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
 384                         mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
 385                                 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
 386                         if (mmap_array[nr_cpu].base == MAP_FAILED) {
 387                                 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
 388                                 exit(-1);
 389                         }
 390
 391                         event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
 392                         event_array[nr_poll].events = POLLIN;
 393                         nr_poll++;
 394                 }
 395
 396                 if (filter != NULL) {
 397                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 398                                         PERF_EVENT_IOC_SET_FILTER, filter);
 399                         if (ret) {
 400                                 error("failed to set filter with %d (%s)\n", errno,
 401                                                 strerror(errno));
 402                                 exit(-1);
 403                         }
 404                 }
 405         }
 406 }
 407
 408 static void open_counters(int cpu)
 409 {
 410         int counter;
 411
 412         group_fd = -1;
 413         for (counter = 0; counter < nr_counters; counter++)
 414                 create_counter(counter, cpu);
 415
 416         nr_cpu++;
 417 }
 418
 419 static int process_buildids(void)
 420 {
 421         u64 size = lseek(output, 0, SEEK_CUR);
 422
 423         if (size == 0)
 424                 return 0;
 425
 426         session->fd = output;
 427         return __perf_session__process_events(session, post_processing_offset,
 428                                               size - post_processing_offset,
 429                                               size, &build_id__mark_dso_hit_ops);
 430 }
 431
 432 static void atexit_header(void)
 433 {
 434         if (!pipe_output) {
 435                 session->header.data_size += bytes_written;
 436
 437                 process_buildids();
 438                 perf_header__write(&session->header, output, true);
 439         }
 440 }
 441
 442 static void event__synthesize_guest_os(struct machine *machine, void *data)
 443 {
 444         int err;
 445         char *guest_kallsyms;
 446         char path[PATH_MAX];
 447         struct perf_session *psession = data;
 448
 449         if (machine__is_host(machine))
 450                 return;
 451
 452         /*
 453          *As for guest kernel when processing subcommand record&report,
 454          *we arrange module mmap prior to guest kernel mmap and trigger
 455          *a preload dso because default guest module symbols are loaded
 456          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
 457          *method is used to avoid symbol missing when the first addr is
 458          *in module instead of in guest kernel.
 459          */
 460         err = event__synthesize_modules(process_synthesized_event,
 461                                         psession, machine);
 462         if (err < 0)
 463                 pr_err("Couldn't record guest kernel [%d]'s reference"
 464                        " relocation symbol.\n", machine->pid);
 465
 466         if (machine__is_default_guest(machine))
 467                 guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
 468         else {
 469                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 470                 guest_kallsyms = path;
 471         }
 472
 473         /*
 474          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
 475          * have no _text sometimes.
 476          */
 477         err = event__synthesize_kernel_mmap(process_synthesized_event,
 478                                             psession, machine, "_text");
 479         if (err < 0)
 480                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 481                                                     psession, machine, "_stext");
 482         if (err < 0)
 483                 pr_err("Couldn't record guest kernel [%d]'s reference"
 484                        " relocation symbol.\n", machine->pid);
 485 }
 486
 487 static struct perf_event_header finished_round_event = {
 488         .size = sizeof(struct perf_event_header),
 489         .type = PERF_RECORD_FINISHED_ROUND,
 490 };
 491
 492 static void mmap_read_all(void)
 493 {
 494         int i;
 495
 496         for (i = 0; i < nr_cpu; i++) {
 497                 if (mmap_array[i].base)
 498                         mmap_read(&mmap_array[i]);
 499         }
 500
 501         if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
 502                 write_output(&finished_round_event, sizeof(finished_round_event));
 503 }
 504
 505 static int __cmd_record(int argc, const char **argv)
 506 {
 507         int i, counter;
 508         struct stat st;
 509         int flags;
 510         int err;
 511         unsigned long waking = 0;
 512         int child_ready_pipe[2], go_pipe[2];
 513         const bool forks = argc > 0;
 514         char buf;
 515         struct machine *machine;
 516
 517         page_size = sysconf(_SC_PAGE_SIZE);
 518
 519         atexit(sig_atexit);
 520         signal(SIGCHLD, sig_handler);
 521         signal(SIGINT, sig_handler);
 522
 523         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 524                 perror("failed to create pipes");
 525                 exit(-1);
 526         }
 527
 528         if (!strcmp(output_name, "-"))
 529                 pipe_output = 1;
 530         else if (!stat(output_name, &st) && st.st_size) {
 531                 if (write_mode == WRITE_FORCE) {
 532                         char oldname[PATH_MAX];
 533                         snprintf(oldname, sizeof(oldname), "%s.old",
 534                                  output_name);
 535                         unlink(oldname);
 536                         rename(output_name, oldname);
 537                 }
 538         } else if (write_mode == WRITE_APPEND) {
 539                 write_mode = WRITE_FORCE;
 540         }
 541
 542         flags = O_CREAT|O_RDWR;
 543         if (write_mode == WRITE_APPEND)
 544                 file_new = 0;
 545         else
 546                 flags |= O_TRUNC;
 547
 548         if (pipe_output)
 549                 output = STDOUT_FILENO;
 550         else
 551                 output = open(output_name, flags, S_IRUSR | S_IWUSR);
 552         if (output < 0) {
 553                 perror("failed to create output file");
 554                 exit(-1);
 555         }
 556
 557         session = perf_session__new(output_name, O_WRONLY,
 558                                     write_mode == WRITE_FORCE, false);
 559         if (session == NULL) {
 560                 pr_err("Not enough memory for reading perf file header\n");
 561                 return -1;
 562         }
 563
 564         if (!file_new) {
 565                 err = perf_header__read(session, output);
 566                 if (err < 0)
 567                         return err;
 568         }
 569
 570         if (have_tracepoints(attrs, nr_counters))
 571                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 572
 573         atexit(atexit_header);
 574
 575         if (forks) {
 576                 child_pid = fork();
 577                 if (child_pid < 0) {
 578                         perror("failed to fork");
 579                         exit(-1);
 580                 }
 581
 582                 if (!child_pid) {
 583                         if (pipe_output)
 584                                 dup2(2, 1);
 585                         close(child_ready_pipe[0]);
 586                         close(go_pipe[1]);
 587                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 588
 589                         /*
 590                          * Do a dummy execvp to get the PLT entry resolved,
 591                          * so we avoid the resolver overhead on the real
 592                          * execvp call.
 593                          */
 594                         execvp("", (char **)argv);
 595
 596                         /*
 597                          * Tell the parent we're ready to go
 598                          */
 599                         close(child_ready_pipe[1]);
 600
 601                         /*
 602                          * Wait until the parent tells us to go.
 603                          */
 604                         if (read(go_pipe[0], &buf, 1) == -1)
 605                                 perror("unable to read pipe");
 606
 607                         execvp(argv[0], (char **)argv);
 608
 609                         perror(argv[0]);
 610                         exit(-1);
 611                 }
 612
 613                 if (!system_wide && target_tid == -1 && target_pid == -1)
 614                         all_tids[0] = child_pid;
 615
 616                 close(child_ready_pipe[1]);
 617                 close(go_pipe[0]);
 618                 /*
 619                  * wait for child to settle
 620                  */
 621                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
 622                         perror("unable to read pipe");
 623                         exit(-1);
 624                 }
 625                 close(child_ready_pipe[0]);
 626         }
 627
 628         nr_cpus = read_cpu_map(cpu_list);
 629         if (nr_cpus < 1) {
 630                 perror("failed to collect number of CPUs\n");
 631                 return -1;
 632         }
 633
 634         if (!system_wide && no_inherit && !cpu_list) {
 635                 open_counters(-1);
 636         } else {
 637                 for (i = 0; i < nr_cpus; i++)
 638                         open_counters(cpumap[i]);
 639         }
 640
 641         if (pipe_output) {
 642                 err = perf_header__write_pipe(output);
 643                 if (err < 0)
 644                         return err;
 645         } else if (file_new) {
 646                 err = perf_header__write(&session->header, output, false);
 647                 if (err < 0)
 648                         return err;
 649         }
 650
 651         post_processing_offset = lseek(output, 0, SEEK_CUR);
 652
 653         if (pipe_output) {
 654                 err = event__synthesize_attrs(&session->header,
 655                                               process_synthesized_event,
 656                                               session);
 657                 if (err < 0) {
 658                         pr_err("Couldn't synthesize attrs.\n");
 659                         return err;
 660                 }
 661
 662                 err = event__synthesize_event_types(process_synthesized_event,
 663                                                     session);
 664                 if (err < 0) {
 665                         pr_err("Couldn't synthesize event_types.\n");
 666                         return err;
 667                 }
 668
 669                 if (have_tracepoints(attrs, nr_counters)) {
 670                         /*
 671                          * FIXME err <= 0 here actually means that
 672                          * there were no tracepoints so its not really
 673                          * an error, just that we don't need to
 674                          * synthesize anything.  We really have to
 675                          * return this more properly and also
 676                          * propagate errors that now are calling die()
 677                          */
 678                         err = event__synthesize_tracing_data(output, attrs,
 679                                                              nr_counters,
 680                                                              process_synthesized_event,
 681                                                              session);
 682                         if (err <= 0) {
 683                                 pr_err("Couldn't record tracing data.\n");
 684                                 return err;
 685                         }
 686                         advance_output(err);
 687                 }
 688         }
 689
 690         machine = perf_session__find_host_machine(session);
 691         if (!machine) {
 692                 pr_err("Couldn't find native kernel information.\n");
 693                 return -1;
 694         }
 695
 696         err = event__synthesize_kernel_mmap(process_synthesized_event,
 697                                             session, machine, "_text");
 698         if (err < 0)
 699                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 700                                                     session, machine, "_stext");
 701         if (err < 0) {
 702                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 703                 return err;
 704         }
 705
 706         err = event__synthesize_modules(process_synthesized_event,
 707                                         session, machine);
 708         if (err < 0) {
 709                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 710                 return err;
 711         }
 712         if (perf_guest)
 713                 perf_session__process_machines(session, event__synthesize_guest_os);
 714
 715         if (!system_wide && cpu_list)
 716                 event__synthesize_thread(target_tid, process_synthesized_event,
 717                                          session);
 718         else
 719                 event__synthesize_threads(process_synthesized_event, session);
 720
 721         if (realtime_prio) {
 722                 struct sched_param param;
 723
 724                 param.sched_priority = realtime_prio;
 725                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 726                         pr_err("Could not set realtime priority.\n");
 727                         exit(-1);
 728                 }
 729         }
 730
 731         /*
 732          * Let the child rip
 733          */
 734         if (forks)
 735                 close(go_pipe[1]);
 736
 737         for (;;) {
 738                 int hits = samples;
 739                 int thread;
 740
 741                 mmap_read_all();
 742
 743                 if (hits == samples) {
 744                         if (done)
 745                                 break;
 746                         err = poll(event_array, nr_poll, -1);
 747                         waking++;
 748                 }
 749
 750                 if (done) {
 751                         for (i = 0; i < nr_cpu; i++) {
 752                                 for (counter = 0;
 753                                         counter < nr_counters;
 754                                         counter++) {
 755                                         for (thread = 0;
 756                                                 thread < thread_num;
 757                                                 thread++)
 758                                                 ioctl(fd[i][counter][thread],
 759                                                         PERF_EVENT_IOC_DISABLE);
 760                                 }
 761                         }
 762                 }
 763         }
 764
 765         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 766
 767         /*
 768          * Approximate RIP event size: 24 bytes.
 769          */
 770         fprintf(stderr,
 771                 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
 772                 (double)bytes_written / 1024.0 / 1024.0,
 773                 output_name,
 774                 bytes_written / 24);
 775
 776         return 0;
 777 }
 778
 779 static const char * const record_usage[] = {
 780         "perf record [<options>] [<command>]",
 781         "perf record [<options>] -- <command> [<options>]",
 782         NULL
 783 };
 784
 785 static bool force, append_file;
 786
 787 static const struct option options[] = {
 788         OPT_CALLBACK('e', "event", NULL, "event",
 789                      "event selector. use 'perf list' to list available events",
 790                      parse_events),
 791         OPT_CALLBACK(0, "filter", NULL, "filter",
 792                      "event filter", parse_filter),
 793         OPT_INTEGER('p', "pid", &target_pid,
 794                     "record events on existing process id"),
 795         OPT_INTEGER('t', "tid", &target_tid,
 796                     "record events on existing thread id"),
 797         OPT_INTEGER('r', "realtime", &realtime_prio,
 798                     "collect data with this RT SCHED_FIFO priority"),
 799         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
 800                     "collect raw sample records from all opened counters"),
 801         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 802                             "system-wide collection from all CPUs"),
 803         OPT_BOOLEAN('A', "append", &append_file,
 804                             "append to the output file to do incremental profiling"),
 805         OPT_STRING('C', "cpu", &cpu_list, "cpu",
 806                     "list of cpus to monitor"),
 807         OPT_BOOLEAN('f', "force", &force,
 808                         "overwrite existing data file (deprecated)"),
 809         OPT_U64('c', "count", &user_interval, "event period to sample"),
 810         OPT_STRING('o', "output", &output_name, "file",
 811                     "output file name"),
 812         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
 813                     "child tasks do not inherit counters"),
 814         OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
 815         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
 816         OPT_BOOLEAN('g', "call-graph", &call_graph,
 817                     "do call-graph (stack chain/backtrace) recording"),
 818         OPT_INCR('v', "verbose", &verbose,
 819                     "be more verbose (show counter open errors, etc)"),
 820         OPT_BOOLEAN('s', "stat", &inherit_stat,
 821                     "per thread counts"),
 822         OPT_BOOLEAN('d', "data", &sample_address,
 823                     "Sample addresses"),
 824         OPT_BOOLEAN('n', "no-samples", &no_samples,
 825                     "don't sample"),
 826         OPT_END()
 827 };
 828
 829 int cmd_record(int argc, const char **argv, const char *prefix __used)
 830 {
 831         int i,j;
 832
 833         argc = parse_options(argc, argv, options, record_usage,
 834                             PARSE_OPT_STOP_AT_NON_OPTION);
 835         if (!argc && target_pid == -1 && target_tid == -1 &&
 836                 !system_wide && !cpu_list)
 837                 usage_with_options(record_usage, options);
 838
 839         if (force && append_file) {
 840                 fprintf(stderr, "Can't overwrite and append at the same time."
 841                                 " You need to choose between -f and -A");
 842                 usage_with_options(record_usage, options);
 843         } else if (append_file) {
 844                 write_mode = WRITE_APPEND;
 845         } else {
 846                 write_mode = WRITE_FORCE;
 847         }
 848
 849         symbol__init();
 850
 851         if (!nr_counters) {
 852                 nr_counters     = 1;
 853                 attrs[0].type   = PERF_TYPE_HARDWARE;
 854                 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
 855         }
 856
 857         if (target_pid != -1) {
 858                 target_tid = target_pid;
 859                 thread_num = find_all_tid(target_pid, &all_tids);
 860                 if (thread_num <= 0) {
 861                         fprintf(stderr, "Can't find all threads of pid %d\n",
 862                                         target_pid);
 863                         usage_with_options(record_usage, options);
 864                 }
 865         } else {
 866                 all_tids=malloc(sizeof(pid_t));
 867                 if (!all_tids)
 868                         return -ENOMEM;
 869
 870                 all_tids[0] = target_tid;
 871                 thread_num = 1;
 872         }
 873
 874         for (i = 0; i < MAX_NR_CPUS; i++) {
 875                 for (j = 0; j < MAX_COUNTERS; j++) {
 876                         fd[i][j] = malloc(sizeof(int)*thread_num);
 877                         if (!fd[i][j])
 878                                 return -ENOMEM;
 879                 }
 880         }
 881         event_array = malloc(
 882                 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
 883         if (!event_array)
 884                 return -ENOMEM;
 885
 886         if (user_interval != ULLONG_MAX)
 887                 default_interval = user_interval;
 888         if (user_freq != UINT_MAX)
 889                 freq = user_freq;
 890
 891         /*
 892          * User specified count overrides default frequency.
 893          */
 894         if (default_interval)
 895                 freq = 0;
 896         else if (freq) {
 897                 default_interval = freq;
 898         } else {
 899                 fprintf(stderr, "frequency and count are zero, aborting\n");
 900                 exit(EXIT_FAILURE);
 901         }
 902
 903         return __cmd_record(argc, argv);
 904 }