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 u64                      user_interval                   = ULLONG_MAX;
  37 static u64                      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 int                      pipe_output                     =      0;
  46 static const char               *output_name                    = "perf.data";
  47 static int                      group                           =      0;
  48 static int                      realtime_prio                   =      0;
  49 static bool                     raw_samples                     =  false;
  50 static bool                     system_wide                     =  false;
  51 static int                      profile_cpu                     =     -1;
  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 static bool                     multiplex                       =  false;
  64 static int                      multiplex_fd                    =     -1;
  65
  66 static long                     samples                         =      0;
  67 static struct timeval           last_read;
  68 static struct timeval           this_read;
  69
  70 static u64                      bytes_written                   =      0;
  71
  72 static struct pollfd            *event_array;
  73
  74 static int                      nr_poll                         =      0;
  75 static int                      nr_cpu                          =      0;
  76
  77 static int                      file_new                        =      1;
  78 static off_t                    post_processing_offset;
  79
  80 static struct perf_session      *session;
  81
  82 struct mmap_data {
  83         int                     counter;
  84         void                    *base;
  85         unsigned int            mask;
  86         unsigned int            prev;
  87 };
  88
  89 static struct mmap_data         *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
  90
  91 static unsigned long mmap_read_head(struct mmap_data *md)
  92 {
  93         struct perf_event_mmap_page *pc = md->base;
  94         long head;
  95
  96         head = pc->data_head;
  97         rmb();
  98
  99         return head;
 100 }
 101
 102 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
 103 {
 104         struct perf_event_mmap_page *pc = md->base;
 105
 106         /*
 107          * ensure all reads are done before we write the tail out.
 108          */
 109         /* mb(); */
 110         pc->data_tail = tail;
 111 }
 112
 113 static void advance_output(size_t size)
 114 {
 115         bytes_written += size;
 116 }
 117
 118 static void write_output(void *buf, size_t size)
 119 {
 120         while (size) {
 121                 int ret = write(output, buf, size);
 122
 123                 if (ret < 0)
 124                         die("failed to write");
 125
 126                 size -= ret;
 127                 buf += ret;
 128
 129                 bytes_written += ret;
 130         }
 131 }
 132
 133 static int process_synthesized_event(event_t *event,
 134                                      struct perf_session *self __used)
 135 {
 136         write_output(event, event->header.size);
 137         return 0;
 138 }
 139
 140 static void mmap_read(struct mmap_data *md)
 141 {
 142         unsigned int head = mmap_read_head(md);
 143         unsigned int old = md->prev;
 144         unsigned char *data = md->base + page_size;
 145         unsigned long size;
 146         void *buf;
 147         int diff;
 148
 149         gettimeofday(&this_read, NULL);
 150
 151         /*
 152          * If we're further behind than half the buffer, there's a chance
 153          * the writer will bite our tail and mess up the samples under us.
 154          *
 155          * If we somehow ended up ahead of the head, we got messed up.
 156          *
 157          * In either case, truncate and restart at head.
 158          */
 159         diff = head - old;
 160         if (diff < 0) {
 161                 struct timeval iv;
 162                 unsigned long msecs;
 163
 164                 timersub(&this_read, &last_read, &iv);
 165                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
 166
 167                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
 168                                 "  Last read %lu msecs ago.\n", msecs);
 169
 170                 /*
 171                  * head points to a known good entry, start there.
 172                  */
 173                 old = head;
 174         }
 175
 176         last_read = this_read;
 177
 178         if (old != head)
 179                 samples++;
 180
 181         size = head - old;
 182
 183         if ((old & md->mask) + size != (head & md->mask)) {
 184                 buf = &data[old & md->mask];
 185                 size = md->mask + 1 - (old & md->mask);
 186                 old += size;
 187
 188                 write_output(buf, size);
 189         }
 190
 191         buf = &data[old & md->mask];
 192         size = head - old;
 193         old += size;
 194
 195         write_output(buf, size);
 196
 197         md->prev = old;
 198         mmap_write_tail(md, old);
 199 }
 200
 201 static volatile int done = 0;
 202 static volatile int signr = -1;
 203
 204 static void sig_handler(int sig)
 205 {
 206         done = 1;
 207         signr = sig;
 208 }
 209
 210 static void sig_atexit(void)
 211 {
 212         if (child_pid != -1)
 213                 kill(child_pid, SIGTERM);
 214
 215         if (signr == -1)
 216                 return;
 217
 218         signal(signr, SIG_DFL);
 219         kill(getpid(), signr);
 220 }
 221
 222 static int group_fd;
 223
 224 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
 225 {
 226         struct perf_header_attr *h_attr;
 227
 228         if (nr < session->header.attrs) {
 229                 h_attr = session->header.attr[nr];
 230         } else {
 231                 h_attr = perf_header_attr__new(a);
 232                 if (h_attr != NULL)
 233                         if (perf_header__add_attr(&session->header, h_attr) < 0) {
 234                                 perf_header_attr__delete(h_attr);
 235                                 h_attr = NULL;
 236                         }
 237         }
 238
 239         return h_attr;
 240 }
 241
 242 static void create_counter(int counter, int cpu)
 243 {
 244         char *filter = filters[counter];
 245         struct perf_event_attr *attr = attrs + counter;
 246         struct perf_header_attr *h_attr;
 247         int track = !counter; /* only the first counter needs these */
 248         int thread_index;
 249         int ret;
 250         struct {
 251                 u64 count;
 252                 u64 time_enabled;
 253                 u64 time_running;
 254                 u64 id;
 255         } read_data;
 256
 257         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
 258                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
 259                                   PERF_FORMAT_ID;
 260
 261         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 262
 263         if (nr_counters > 1)
 264                 attr->sample_type |= PERF_SAMPLE_ID;
 265
 266         /*
 267          * We default some events to a 1 default interval. But keep
 268          * it a weak assumption overridable by the user.
 269          */
 270         if (!attr->sample_period || (user_freq != UINT_MAX &&
 271                                      user_interval != ULLONG_MAX)) {
 272                 if (freq) {
 273                         attr->sample_type       |= PERF_SAMPLE_PERIOD;
 274                         attr->freq              = 1;
 275                         attr->sample_freq       = freq;
 276                 } else {
 277                         attr->sample_period = default_interval;
 278                 }
 279         }
 280
 281         if (no_samples)
 282                 attr->sample_freq = 0;
 283
 284         if (inherit_stat)
 285                 attr->inherit_stat = 1;
 286
 287         if (sample_address)
 288                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 289
 290         if (call_graph)
 291                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 292
 293         if (raw_samples) {
 294                 attr->sample_type       |= PERF_SAMPLE_TIME;
 295                 attr->sample_type       |= PERF_SAMPLE_RAW;
 296                 attr->sample_type       |= PERF_SAMPLE_CPU;
 297         }
 298
 299         attr->mmap              = track;
 300         attr->comm              = track;
 301         attr->inherit           = !no_inherit;
 302         if (target_pid == -1 && target_tid == -1 && !system_wide) {
 303                 attr->disabled = 1;
 304                 attr->enable_on_exec = 1;
 305         }
 306
 307         for (thread_index = 0; thread_index < thread_num; thread_index++) {
 308 try_again:
 309                 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
 310                                 all_tids[thread_index], cpu, group_fd, 0);
 311
 312                 if (fd[nr_cpu][counter][thread_index] < 0) {
 313                         int err = errno;
 314
 315                         if (err == EPERM || err == EACCES)
 316                                 die("Permission error - are you root?\n"
 317                                         "\t Consider tweaking"
 318                                         " /proc/sys/kernel/perf_event_paranoid.\n");
 319                         else if (err ==  ENODEV && profile_cpu != -1) {
 320                                 die("No such device - did you specify"
 321                                         " an out-of-range profile CPU?\n");
 322                         }
 323
 324                         /*
 325                          * If it's cycles then fall back to hrtimer
 326                          * based cpu-clock-tick sw counter, which
 327                          * is always available even if no PMU support:
 328                          */
 329                         if (attr->type == PERF_TYPE_HARDWARE
 330                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 331
 332                                 if (verbose)
 333                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
 334                                 attr->type = PERF_TYPE_SOFTWARE;
 335                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 336                                 goto try_again;
 337                         }
 338                         printf("\n");
 339                         error("perfcounter syscall returned with %d (%s)\n",
 340                                         fd[nr_cpu][counter][thread_index], strerror(err));
 341
 342 #if defined(__i386__) || defined(__x86_64__)
 343                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
 344                                 die("No hardware sampling interrupt available."
 345                                     " No APIC? If so then you can boot the kernel"
 346                                     " with the \"lapic\" boot parameter to"
 347                                     " force-enable it.\n");
 348 #endif
 349
 350                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
 351                         exit(-1);
 352                 }
 353
 354                 h_attr = get_header_attr(attr, counter);
 355                 if (h_attr == NULL)
 356                         die("nomem\n");
 357
 358                 if (!file_new) {
 359                         if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
 360                                 fprintf(stderr, "incompatible append\n");
 361                                 exit(-1);
 362                         }
 363                 }
 364
 365                 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
 366                         perror("Unable to read perf file descriptor\n");
 367                         exit(-1);
 368                 }
 369
 370                 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
 371                         pr_warning("Not enough memory to add id\n");
 372                         exit(-1);
 373                 }
 374
 375                 assert(fd[nr_cpu][counter][thread_index] >= 0);
 376                 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
 377
 378                 /*
 379                  * First counter acts as the group leader:
 380                  */
 381                 if (group && group_fd == -1)
 382                         group_fd = fd[nr_cpu][counter][thread_index];
 383                 if (multiplex && multiplex_fd == -1)
 384                         multiplex_fd = fd[nr_cpu][counter][thread_index];
 385
 386                 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
 387
 388                         ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
 389                         assert(ret != -1);
 390                 } else {
 391                         event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
 392                         event_array[nr_poll].events = POLLIN;
 393                         nr_poll++;
 394
 395                         mmap_array[nr_cpu][counter][thread_index].counter = counter;
 396                         mmap_array[nr_cpu][counter][thread_index].prev = 0;
 397                         mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
 398                         mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
 399                                 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
 400                         if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
 401                                 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
 402                                 exit(-1);
 403                         }
 404                 }
 405
 406                 if (filter != NULL) {
 407                         ret = ioctl(fd[nr_cpu][counter][thread_index],
 408                                         PERF_EVENT_IOC_SET_FILTER, filter);
 409                         if (ret) {
 410                                 error("failed to set filter with %d (%s)\n", errno,
 411                                                 strerror(errno));
 412                                 exit(-1);
 413                         }
 414                 }
 415         }
 416 }
 417
 418 static void open_counters(int cpu)
 419 {
 420         int counter;
 421
 422         group_fd = -1;
 423         for (counter = 0; counter < nr_counters; counter++)
 424                 create_counter(counter, cpu);
 425
 426         nr_cpu++;
 427 }
 428
 429 static int process_buildids(void)
 430 {
 431         u64 size = lseek(output, 0, SEEK_CUR);
 432
 433         if (size == 0)
 434                 return 0;
 435
 436         session->fd = output;
 437         return __perf_session__process_events(session, post_processing_offset,
 438                                               size - post_processing_offset,
 439                                               size, &build_id__mark_dso_hit_ops);
 440 }
 441
 442 static void atexit_header(void)
 443 {
 444         if (!pipe_output) {
 445                 session->header.data_size += bytes_written;
 446
 447                 process_buildids();
 448                 perf_header__write(&session->header, output, true);
 449         }
 450 }
 451
 452 static void event__synthesize_guest_os(struct machine *machine, void *data)
 453 {
 454         int err;
 455         char *guest_kallsyms;
 456         char path[PATH_MAX];
 457         struct perf_session *psession = data;
 458
 459         if (machine__is_host(machine))
 460                 return;
 461
 462         /*
 463          *As for guest kernel when processing subcommand record&report,
 464          *we arrange module mmap prior to guest kernel mmap and trigger
 465          *a preload dso because default guest module symbols are loaded
 466          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
 467          *method is used to avoid symbol missing when the first addr is
 468          *in module instead of in guest kernel.
 469          */
 470         err = event__synthesize_modules(process_synthesized_event,
 471                                         psession, machine);
 472         if (err < 0)
 473                 pr_err("Couldn't record guest kernel [%d]'s reference"
 474                        " relocation symbol.\n", machine->pid);
 475
 476         if (machine__is_default_guest(machine))
 477                 guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
 478         else {
 479                 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 480                 guest_kallsyms = path;
 481         }
 482
 483         /*
 484          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
 485          * have no _text sometimes.
 486          */
 487         err = event__synthesize_kernel_mmap(process_synthesized_event,
 488                                             psession, machine, "_text");
 489         if (err < 0)
 490                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 491                                                     psession, machine, "_stext");
 492         if (err < 0)
 493                 pr_err("Couldn't record guest kernel [%d]'s reference"
 494                        " relocation symbol.\n", machine->pid);
 495 }
 496
 497 static struct perf_event_header finished_round_event = {
 498         .size = sizeof(struct perf_event_header),
 499         .type = PERF_RECORD_FINISHED_ROUND,
 500 };
 501
 502 static void mmap_read_all(void)
 503 {
 504         int i, counter, thread;
 505
 506         for (i = 0; i < nr_cpu; i++) {
 507                 for (counter = 0; counter < nr_counters; counter++) {
 508                         for (thread = 0; thread < thread_num; thread++) {
 509                                 if (mmap_array[i][counter][thread].base)
 510                                         mmap_read(&mmap_array[i][counter][thread]);
 511                         }
 512
 513                 }
 514         }
 515
 516         if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
 517                 write_output(&finished_round_event, sizeof(finished_round_event));
 518 }
 519
 520 static int __cmd_record(int argc, const char **argv)
 521 {
 522         int i, counter;
 523         struct stat st;
 524         pid_t pid = 0;
 525         int flags;
 526         int err;
 527         unsigned long waking = 0;
 528         int child_ready_pipe[2], go_pipe[2];
 529         const bool forks = argc > 0;
 530         char buf;
 531         struct machine *machine;
 532
 533         page_size = sysconf(_SC_PAGE_SIZE);
 534
 535         atexit(sig_atexit);
 536         signal(SIGCHLD, sig_handler);
 537         signal(SIGINT, sig_handler);
 538
 539         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
 540                 perror("failed to create pipes");
 541                 exit(-1);
 542         }
 543
 544         if (!strcmp(output_name, "-"))
 545                 pipe_output = 1;
 546         else if (!stat(output_name, &st) && st.st_size) {
 547                 if (write_mode == WRITE_FORCE) {
 548                         char oldname[PATH_MAX];
 549                         snprintf(oldname, sizeof(oldname), "%s.old",
 550                                  output_name);
 551                         unlink(oldname);
 552                         rename(output_name, oldname);
 553                 }
 554         } else if (write_mode == WRITE_APPEND) {
 555                 write_mode = WRITE_FORCE;
 556         }
 557
 558         flags = O_CREAT|O_RDWR;
 559         if (write_mode == WRITE_APPEND)
 560                 file_new = 0;
 561         else
 562                 flags |= O_TRUNC;
 563
 564         if (pipe_output)
 565                 output = STDOUT_FILENO;
 566         else
 567                 output = open(output_name, flags, S_IRUSR | S_IWUSR);
 568         if (output < 0) {
 569                 perror("failed to create output file");
 570                 exit(-1);
 571         }
 572
 573         session = perf_session__new(output_name, O_WRONLY,
 574                                     write_mode == WRITE_FORCE, false);
 575         if (session == NULL) {
 576                 pr_err("Not enough memory for reading perf file header\n");
 577                 return -1;
 578         }
 579
 580         if (!file_new) {
 581                 err = perf_header__read(session, output);
 582                 if (err < 0)
 583                         return err;
 584         }
 585
 586         if (have_tracepoints(attrs, nr_counters))
 587                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
 588
 589         atexit(atexit_header);
 590
 591         if (forks) {
 592                 child_pid = fork();
 593                 if (pid < 0) {
 594                         perror("failed to fork");
 595                         exit(-1);
 596                 }
 597
 598                 if (!child_pid) {
 599                         if (pipe_output)
 600                                 dup2(2, 1);
 601                         close(child_ready_pipe[0]);
 602                         close(go_pipe[1]);
 603                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
 604
 605                         /*
 606                          * Do a dummy execvp to get the PLT entry resolved,
 607                          * so we avoid the resolver overhead on the real
 608                          * execvp call.
 609                          */
 610                         execvp("", (char **)argv);
 611
 612                         /*
 613                          * Tell the parent we're ready to go
 614                          */
 615                         close(child_ready_pipe[1]);
 616
 617                         /*
 618                          * Wait until the parent tells us to go.
 619                          */
 620                         if (read(go_pipe[0], &buf, 1) == -1)
 621                                 perror("unable to read pipe");
 622
 623                         execvp(argv[0], (char **)argv);
 624
 625                         perror(argv[0]);
 626                         exit(-1);
 627                 }
 628
 629                 if (!system_wide && target_tid == -1 && target_pid == -1)
 630                         all_tids[0] = child_pid;
 631
 632                 close(child_ready_pipe[1]);
 633                 close(go_pipe[0]);
 634                 /*
 635                  * wait for child to settle
 636                  */
 637                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
 638                         perror("unable to read pipe");
 639                         exit(-1);
 640                 }
 641                 close(child_ready_pipe[0]);
 642         }
 643
 644         if ((!system_wide && no_inherit) || profile_cpu != -1) {
 645                 open_counters(profile_cpu);
 646         } else {
 647                 nr_cpus = read_cpu_map();
 648                 for (i = 0; i < nr_cpus; i++)
 649                         open_counters(cpumap[i]);
 650         }
 651
 652         if (pipe_output) {
 653                 err = perf_header__write_pipe(output);
 654                 if (err < 0)
 655                         return err;
 656         } else if (file_new) {
 657                 err = perf_header__write(&session->header, output, false);
 658                 if (err < 0)
 659                         return err;
 660         }
 661
 662         post_processing_offset = lseek(output, 0, SEEK_CUR);
 663
 664         if (pipe_output) {
 665                 err = event__synthesize_attrs(&session->header,
 666                                               process_synthesized_event,
 667                                               session);
 668                 if (err < 0) {
 669                         pr_err("Couldn't synthesize attrs.\n");
 670                         return err;
 671                 }
 672
 673                 err = event__synthesize_event_types(process_synthesized_event,
 674                                                     session);
 675                 if (err < 0) {
 676                         pr_err("Couldn't synthesize event_types.\n");
 677                         return err;
 678                 }
 679
 680                 if (have_tracepoints(attrs, nr_counters)) {
 681                         /*
 682                          * FIXME err <= 0 here actually means that
 683                          * there were no tracepoints so its not really
 684                          * an error, just that we don't need to
 685                          * synthesize anything.  We really have to
 686                          * return this more properly and also
 687                          * propagate errors that now are calling die()
 688                          */
 689                         err = event__synthesize_tracing_data(output, attrs,
 690                                                              nr_counters,
 691                                                              process_synthesized_event,
 692                                                              session);
 693                         if (err <= 0) {
 694                                 pr_err("Couldn't record tracing data.\n");
 695                                 return err;
 696                         }
 697                         advance_output(err);
 698                 }
 699         }
 700
 701         machine = perf_session__find_host_machine(session);
 702         if (!machine) {
 703                 pr_err("Couldn't find native kernel information.\n");
 704                 return -1;
 705         }
 706
 707         err = event__synthesize_kernel_mmap(process_synthesized_event,
 708                                             session, machine, "_text");
 709         if (err < 0)
 710                 err = event__synthesize_kernel_mmap(process_synthesized_event,
 711                                                     session, machine, "_stext");
 712         if (err < 0) {
 713                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 714                 return err;
 715         }
 716
 717         err = event__synthesize_modules(process_synthesized_event,
 718                                         session, machine);
 719         if (err < 0) {
 720                 pr_err("Couldn't record kernel reference relocation symbol.\n");
 721                 return err;
 722         }
 723         if (perf_guest)
 724                 perf_session__process_machines(session, event__synthesize_guest_os);
 725
 726         if (!system_wide && profile_cpu == -1)
 727                 event__synthesize_thread(target_tid, process_synthesized_event,
 728                                          session);
 729         else
 730                 event__synthesize_threads(process_synthesized_event, session);
 731
 732         if (realtime_prio) {
 733                 struct sched_param param;
 734
 735                 param.sched_priority = realtime_prio;
 736                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 737                         pr_err("Could not set realtime priority.\n");
 738                         exit(-1);
 739                 }
 740         }
 741
 742         /*
 743          * Let the child rip
 744          */
 745         if (forks)
 746                 close(go_pipe[1]);
 747
 748         for (;;) {
 749                 int hits = samples;
 750                 int thread;
 751
 752                 mmap_read_all();
 753
 754                 if (hits == samples) {
 755                         if (done)
 756                                 break;
 757                         err = poll(event_array, nr_poll, -1);
 758                         waking++;
 759                 }
 760
 761                 if (done) {
 762                         for (i = 0; i < nr_cpu; i++) {
 763                                 for (counter = 0;
 764                                         counter < nr_counters;
 765                                         counter++) {
 766                                         for (thread = 0;
 767                                                 thread < thread_num;
 768                                                 thread++)
 769                                                 ioctl(fd[i][counter][thread],
 770                                                         PERF_EVENT_IOC_DISABLE);
 771                                 }
 772                         }
 773                 }
 774         }
 775
 776         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 777
 778         /*
 779          * Approximate RIP event size: 24 bytes.
 780          */
 781         fprintf(stderr,
 782                 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
 783                 (double)bytes_written / 1024.0 / 1024.0,
 784                 output_name,
 785                 bytes_written / 24);
 786
 787         return 0;
 788 }
 789
 790 static const char * const record_usage[] = {
 791         "perf record [<options>] [<command>]",
 792         "perf record [<options>] -- <command> [<options>]",
 793         NULL
 794 };
 795
 796 static bool force, append_file;
 797
 798 static const struct option options[] = {
 799         OPT_CALLBACK('e', "event", NULL, "event",
 800                      "event selector. use 'perf list' to list available events",
 801                      parse_events),
 802         OPT_CALLBACK(0, "filter", NULL, "filter",
 803                      "event filter", parse_filter),
 804         OPT_INTEGER('p', "pid", &target_pid,
 805                     "record events on existing process id"),
 806         OPT_INTEGER('t', "tid", &target_tid,
 807                     "record events on existing thread id"),
 808         OPT_INTEGER('r', "realtime", &realtime_prio,
 809                     "collect data with this RT SCHED_FIFO priority"),
 810         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
 811                     "collect raw sample records from all opened counters"),
 812         OPT_BOOLEAN('a', "all-cpus", &system_wide,
 813                             "system-wide collection from all CPUs"),
 814         OPT_BOOLEAN('A', "append", &append_file,
 815                             "append to the output file to do incremental profiling"),
 816         OPT_INTEGER('C', "profile_cpu", &profile_cpu,
 817                             "CPU to profile on"),
 818         OPT_BOOLEAN('f', "force", &force,
 819                         "overwrite existing data file (deprecated)"),
 820         OPT_U64('c', "count", &user_interval, "event period to sample"),
 821         OPT_STRING('o', "output", &output_name, "file",
 822                     "output file name"),
 823         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
 824                     "child tasks do not inherit counters"),
 825         OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
 826         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
 827         OPT_BOOLEAN('g', "call-graph", &call_graph,
 828                     "do call-graph (stack chain/backtrace) recording"),
 829         OPT_INCR('v', "verbose", &verbose,
 830                     "be more verbose (show counter open errors, etc)"),
 831         OPT_BOOLEAN('s', "stat", &inherit_stat,
 832                     "per thread counts"),
 833         OPT_BOOLEAN('d', "data", &sample_address,
 834                     "Sample addresses"),
 835         OPT_BOOLEAN('n', "no-samples", &no_samples,
 836                     "don't sample"),
 837         OPT_BOOLEAN('M', "multiplex", &multiplex,
 838                     "multiplex counter output in a single channel"),
 839         OPT_END()
 840 };
 841
 842 int cmd_record(int argc, const char **argv, const char *prefix __used)
 843 {
 844         int i,j;
 845
 846         argc = parse_options(argc, argv, options, record_usage,
 847                             PARSE_OPT_STOP_AT_NON_OPTION);
 848         if (!argc && target_pid == -1 && target_tid == -1 &&
 849                 !system_wide && profile_cpu == -1)
 850                 usage_with_options(record_usage, options);
 851
 852         if (force && append_file) {
 853                 fprintf(stderr, "Can't overwrite and append at the same time."
 854                                 " You need to choose between -f and -A");
 855                 usage_with_options(record_usage, options);
 856         } else if (append_file) {
 857                 write_mode = WRITE_APPEND;
 858         } else {
 859                 write_mode = WRITE_FORCE;
 860         }
 861
 862         symbol__init();
 863
 864         if (!nr_counters) {
 865                 nr_counters     = 1;
 866                 attrs[0].type   = PERF_TYPE_HARDWARE;
 867                 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
 868         }
 869
 870         if (target_pid != -1) {
 871                 target_tid = target_pid;
 872                 thread_num = find_all_tid(target_pid, &all_tids);
 873                 if (thread_num <= 0) {
 874                         fprintf(stderr, "Can't find all threads of pid %d\n",
 875                                         target_pid);
 876                         usage_with_options(record_usage, options);
 877                 }
 878         } else {
 879                 all_tids=malloc(sizeof(pid_t));
 880                 if (!all_tids)
 881                         return -ENOMEM;
 882
 883                 all_tids[0] = target_tid;
 884                 thread_num = 1;
 885         }
 886
 887         for (i = 0; i < MAX_NR_CPUS; i++) {
 888                 for (j = 0; j < MAX_COUNTERS; j++) {
 889                         fd[i][j] = malloc(sizeof(int)*thread_num);
 890                         mmap_array[i][j] = zalloc(
 891                                 sizeof(struct mmap_data)*thread_num);
 892                         if (!fd[i][j] || !mmap_array[i][j])
 893                                 return -ENOMEM;
 894                 }
 895         }
 896         event_array = malloc(
 897                 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
 898         if (!event_array)
 899                 return -ENOMEM;
 900
 901         if (user_interval != ULLONG_MAX)
 902                 default_interval = user_interval;
 903         if (user_freq != UINT_MAX)
 904                 freq = user_freq;
 905
 906         /*
 907          * User specified count overrides default frequency.
 908          */
 909         if (default_interval)
 910                 freq = 0;
 911         else if (freq) {
 912                 default_interval = freq;
 913         } else {
 914                 fprintf(stderr, "frequency and count are zero, aborting\n");
 915                 exit(EXIT_FAILURE);
 916         }
 917
 918         return __cmd_record(argc, argv);
 919 }