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/evsel.h" 22 #include "util/debug.h" 23 #include "util/session.h" 24 #include "util/symbol.h" 25 #include "util/cpumap.h" 26 27 #include <unistd.h> 28 #include <sched.h> 29 #include <sys/mman.h> 30 31 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) 32 33 enum write_mode_t { 34 WRITE_FORCE, 35 WRITE_APPEND 36 }; 37 38 static u64 user_interval = ULLONG_MAX; 39 static u64 default_interval = 0; 40 static u64 sample_type; 41 42 static struct cpu_map *cpus; 43 static unsigned int page_size; 44 static unsigned int mmap_pages = 128; 45 static unsigned int user_freq = UINT_MAX; 46 static int freq = 1000; 47 static int output; 48 static int pipe_output = 0; 49 static const char *output_name = "perf.data"; 50 static int group = 0; 51 static int realtime_prio = 0; 52 static bool raw_samples = false; 53 static bool sample_id_all_avail = true; 54 static bool system_wide = false; 55 static pid_t target_pid = -1; 56 static pid_t target_tid = -1; 57 static struct thread_map *threads; 58 static pid_t child_pid = -1; 59 static bool no_inherit = false; 60 static enum write_mode_t write_mode = WRITE_FORCE; 61 static bool call_graph = false; 62 static bool inherit_stat = false; 63 static bool no_samples = false; 64 static bool sample_address = false; 65 static bool sample_time = false; 66 static bool no_buildid = false; 67 static bool no_buildid_cache = false; 68 69 static long samples = 0; 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 static const char *cpu_list; 82 83 struct mmap_data { 84 void *base; 85 unsigned int mask; 86 unsigned int prev; 87 }; 88 89 static struct mmap_data mmap_array[MAX_NR_CPUS]; 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 sample_data *sample __used, 135 struct perf_session *self __used) 136 { 137 write_output(event, event->header.size); 138 return 0; 139 } 140 141 static void mmap_read(struct mmap_data *md) 142 { 143 unsigned int head = mmap_read_head(md); 144 unsigned int old = md->prev; 145 unsigned char *data = md->base + page_size; 146 unsigned long size; 147 void *buf; 148 int diff; 149 150 /* 151 * If we're further behind than half the buffer, there's a chance 152 * the writer will bite our tail and mess up the samples under us. 153 * 154 * If we somehow ended up ahead of the head, we got messed up. 155 * 156 * In either case, truncate and restart at head. 157 */ 158 diff = head - old; 159 if (diff < 0) { 160 fprintf(stderr, "WARNING: failed to keep up with mmap data\n"); 161 /* 162 * head points to a known good entry, start there. 163 */ 164 old = head; 165 } 166 167 if (old != head) 168 samples++; 169 170 size = head - old; 171 172 if ((old & md->mask) + size != (head & md->mask)) { 173 buf = &data[old & md->mask]; 174 size = md->mask + 1 - (old & md->mask); 175 old += size; 176 177 write_output(buf, size); 178 } 179 180 buf = &data[old & md->mask]; 181 size = head - old; 182 old += size; 183 184 write_output(buf, size); 185 186 md->prev = old; 187 mmap_write_tail(md, old); 188 } 189 190 static volatile int done = 0; 191 static volatile int signr = -1; 192 193 static void sig_handler(int sig) 194 { 195 done = 1; 196 signr = sig; 197 } 198 199 static void sig_atexit(void) 200 { 201 if (child_pid > 0) 202 kill(child_pid, SIGTERM); 203 204 if (signr == -1 || signr == SIGUSR1) 205 return; 206 207 signal(signr, SIG_DFL); 208 kill(getpid(), signr); 209 } 210 211 static int group_fd; 212 213 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr) 214 { 215 struct perf_header_attr *h_attr; 216 217 if (nr < session->header.attrs) { 218 h_attr = session->header.attr[nr]; 219 } else { 220 h_attr = perf_header_attr__new(a); 221 if (h_attr != NULL) 222 if (perf_header__add_attr(&session->header, h_attr) < 0) { 223 perf_header_attr__delete(h_attr); 224 h_attr = NULL; 225 } 226 } 227 228 return h_attr; 229 } 230 231 static void create_counter(struct perf_evsel *evsel, int cpu) 232 { 233 char *filter = evsel->filter; 234 struct perf_event_attr *attr = &evsel->attr; 235 struct perf_header_attr *h_attr; 236 int track = !evsel->idx; /* only the first counter needs these */ 237 int thread_index; 238 int ret; 239 struct { 240 u64 count; 241 u64 time_enabled; 242 u64 time_running; 243 u64 id; 244 } read_data; 245 /* 246 * Check if parse_single_tracepoint_event has already asked for 247 * PERF_SAMPLE_TIME. 248 * 249 * XXX this is kludgy but short term fix for problems introduced by 250 * eac23d1c that broke 'perf script' by having different sample_types 251 * when using multiple tracepoint events when we use a perf binary 252 * that tries to use sample_id_all on an older kernel. 253 * 254 * We need to move counter creation to perf_session, support 255 * different sample_types, etc. 256 */ 257 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME; 258 259 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | 260 PERF_FORMAT_TOTAL_TIME_RUNNING | 261 PERF_FORMAT_ID; 262 263 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; 264 265 if (nr_counters > 1) 266 attr->sample_type |= PERF_SAMPLE_ID; 267 268 /* 269 * We default some events to a 1 default interval. But keep 270 * it a weak assumption overridable by the user. 271 */ 272 if (!attr->sample_period || (user_freq != UINT_MAX && 273 user_interval != ULLONG_MAX)) { 274 if (freq) { 275 attr->sample_type |= PERF_SAMPLE_PERIOD; 276 attr->freq = 1; 277 attr->sample_freq = freq; 278 } else { 279 attr->sample_period = default_interval; 280 } 281 } 282 283 if (no_samples) 284 attr->sample_freq = 0; 285 286 if (inherit_stat) 287 attr->inherit_stat = 1; 288 289 if (sample_address) { 290 attr->sample_type |= PERF_SAMPLE_ADDR; 291 attr->mmap_data = track; 292 } 293 294 if (call_graph) 295 attr->sample_type |= PERF_SAMPLE_CALLCHAIN; 296 297 if (system_wide) 298 attr->sample_type |= PERF_SAMPLE_CPU; 299 300 if (sample_id_all_avail && 301 (sample_time || system_wide || !no_inherit || cpu_list)) 302 attr->sample_type |= PERF_SAMPLE_TIME; 303 304 if (raw_samples) { 305 attr->sample_type |= PERF_SAMPLE_TIME; 306 attr->sample_type |= PERF_SAMPLE_RAW; 307 attr->sample_type |= PERF_SAMPLE_CPU; 308 } 309 310 attr->mmap = track; 311 attr->comm = track; 312 attr->inherit = !no_inherit; 313 if (target_pid == -1 && target_tid == -1 && !system_wide) { 314 attr->disabled = 1; 315 attr->enable_on_exec = 1; 316 } 317 retry_sample_id: 318 attr->sample_id_all = sample_id_all_avail ? 1 : 0; 319 320 for (thread_index = 0; thread_index < threads->nr; thread_index++) { 321 try_again: 322 FD(evsel, nr_cpu, thread_index) = sys_perf_event_open(attr, threads->map[thread_index], cpu, group_fd, 0); 323 324 if (FD(evsel, nr_cpu, thread_index) < 0) { 325 int err = errno; 326 327 if (err == EPERM || err == EACCES) 328 die("Permission error - are you root?\n" 329 "\t Consider tweaking" 330 " /proc/sys/kernel/perf_event_paranoid.\n"); 331 else if (err == ENODEV && cpu_list) { 332 die("No such device - did you specify" 333 " an out-of-range profile CPU?\n"); 334 } else if (err == EINVAL && sample_id_all_avail) { 335 /* 336 * Old kernel, no attr->sample_id_type_all field 337 */ 338 sample_id_all_avail = false; 339 if (!sample_time && !raw_samples && !time_needed) 340 attr->sample_type &= ~PERF_SAMPLE_TIME; 341 342 goto retry_sample_id; 343 } 344 345 /* 346 * If it's cycles then fall back to hrtimer 347 * based cpu-clock-tick sw counter, which 348 * is always available even if no PMU support: 349 */ 350 if (attr->type == PERF_TYPE_HARDWARE 351 && attr->config == PERF_COUNT_HW_CPU_CYCLES) { 352 353 if (verbose) 354 warning(" ... trying to fall back to cpu-clock-ticks\n"); 355 attr->type = PERF_TYPE_SOFTWARE; 356 attr->config = PERF_COUNT_SW_CPU_CLOCK; 357 goto try_again; 358 } 359 printf("\n"); 360 error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", 361 FD(evsel, nr_cpu, thread_index), strerror(err)); 362 363 #if defined(__i386__) || defined(__x86_64__) 364 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) 365 die("No hardware sampling interrupt available." 366 " No APIC? If so then you can boot the kernel" 367 " with the \"lapic\" boot parameter to" 368 " force-enable it.\n"); 369 #endif 370 371 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); 372 exit(-1); 373 } 374 375 h_attr = get_header_attr(attr, evsel->idx); 376 if (h_attr == NULL) 377 die("nomem\n"); 378 379 if (!file_new) { 380 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) { 381 fprintf(stderr, "incompatible append\n"); 382 exit(-1); 383 } 384 } 385 386 if (read(FD(evsel, nr_cpu, thread_index), &read_data, sizeof(read_data)) == -1) { 387 perror("Unable to read perf file descriptor"); 388 exit(-1); 389 } 390 391 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) { 392 pr_warning("Not enough memory to add id\n"); 393 exit(-1); 394 } 395 396 assert(FD(evsel, nr_cpu, thread_index) >= 0); 397 fcntl(FD(evsel, nr_cpu, thread_index), F_SETFL, O_NONBLOCK); 398 399 /* 400 * First counter acts as the group leader: 401 */ 402 if (group && group_fd == -1) 403 group_fd = FD(evsel, nr_cpu, thread_index); 404 405 if (evsel->idx || thread_index) { 406 struct perf_evsel *first; 407 first = list_entry(evsel_list.next, struct perf_evsel, node); 408 ret = ioctl(FD(evsel, nr_cpu, thread_index), 409 PERF_EVENT_IOC_SET_OUTPUT, 410 FD(first, nr_cpu, 0)); 411 if (ret) { 412 error("failed to set output: %d (%s)\n", errno, 413 strerror(errno)); 414 exit(-1); 415 } 416 } else { 417 mmap_array[nr_cpu].prev = 0; 418 mmap_array[nr_cpu].mask = mmap_pages*page_size - 1; 419 mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size, 420 PROT_READ | PROT_WRITE, MAP_SHARED, FD(evsel, nr_cpu, thread_index), 0); 421 if (mmap_array[nr_cpu].base == MAP_FAILED) { 422 error("failed to mmap with %d (%s)\n", errno, strerror(errno)); 423 exit(-1); 424 } 425 426 event_array[nr_poll].fd = FD(evsel, nr_cpu, thread_index); 427 event_array[nr_poll].events = POLLIN; 428 nr_poll++; 429 } 430 431 if (filter != NULL) { 432 ret = ioctl(FD(evsel, nr_cpu, thread_index), 433 PERF_EVENT_IOC_SET_FILTER, filter); 434 if (ret) { 435 error("failed to set filter with %d (%s)\n", errno, 436 strerror(errno)); 437 exit(-1); 438 } 439 } 440 } 441 442 if (!sample_type) 443 sample_type = attr->sample_type; 444 } 445 446 static void open_counters(int cpu) 447 { 448 struct perf_evsel *pos; 449 450 group_fd = -1; 451 452 list_for_each_entry(pos, &evsel_list, node) 453 create_counter(pos, cpu); 454 455 nr_cpu++; 456 } 457 458 static int process_buildids(void) 459 { 460 u64 size = lseek(output, 0, SEEK_CUR); 461 462 if (size == 0) 463 return 0; 464 465 session->fd = output; 466 return __perf_session__process_events(session, post_processing_offset, 467 size - post_processing_offset, 468 size, &build_id__mark_dso_hit_ops); 469 } 470 471 static void atexit_header(void) 472 { 473 if (!pipe_output) { 474 session->header.data_size += bytes_written; 475 476 if (!no_buildid) 477 process_buildids(); 478 perf_header__write(&session->header, output, true); 479 perf_session__delete(session); 480 symbol__exit(); 481 } 482 } 483 484 static void event__synthesize_guest_os(struct machine *machine, void *data) 485 { 486 int err; 487 struct perf_session *psession = data; 488 489 if (machine__is_host(machine)) 490 return; 491 492 /* 493 *As for guest kernel when processing subcommand record&report, 494 *we arrange module mmap prior to guest kernel mmap and trigger 495 *a preload dso because default guest module symbols are loaded 496 *from guest kallsyms instead of /lib/modules/XXX/XXX. This 497 *method is used to avoid symbol missing when the first addr is 498 *in module instead of in guest kernel. 499 */ 500 err = event__synthesize_modules(process_synthesized_event, 501 psession, machine); 502 if (err < 0) 503 pr_err("Couldn't record guest kernel [%d]'s reference" 504 " relocation symbol.\n", machine->pid); 505 506 /* 507 * We use _stext for guest kernel because guest kernel's /proc/kallsyms 508 * have no _text sometimes. 509 */ 510 err = event__synthesize_kernel_mmap(process_synthesized_event, 511 psession, machine, "_text"); 512 if (err < 0) 513 err = event__synthesize_kernel_mmap(process_synthesized_event, 514 psession, machine, "_stext"); 515 if (err < 0) 516 pr_err("Couldn't record guest kernel [%d]'s reference" 517 " relocation symbol.\n", machine->pid); 518 } 519 520 static struct perf_event_header finished_round_event = { 521 .size = sizeof(struct perf_event_header), 522 .type = PERF_RECORD_FINISHED_ROUND, 523 }; 524 525 static void mmap_read_all(void) 526 { 527 int i; 528 529 for (i = 0; i < nr_cpu; i++) { 530 if (mmap_array[i].base) 531 mmap_read(&mmap_array[i]); 532 } 533 534 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) 535 write_output(&finished_round_event, sizeof(finished_round_event)); 536 } 537 538 static int __cmd_record(int argc, const char **argv) 539 { 540 int i; 541 struct stat st; 542 int flags; 543 int err; 544 unsigned long waking = 0; 545 int child_ready_pipe[2], go_pipe[2]; 546 const bool forks = argc > 0; 547 char buf; 548 struct machine *machine; 549 550 page_size = sysconf(_SC_PAGE_SIZE); 551 552 atexit(sig_atexit); 553 signal(SIGCHLD, sig_handler); 554 signal(SIGINT, sig_handler); 555 signal(SIGUSR1, sig_handler); 556 557 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { 558 perror("failed to create pipes"); 559 exit(-1); 560 } 561 562 if (!strcmp(output_name, "-")) 563 pipe_output = 1; 564 else if (!stat(output_name, &st) && st.st_size) { 565 if (write_mode == WRITE_FORCE) { 566 char oldname[PATH_MAX]; 567 snprintf(oldname, sizeof(oldname), "%s.old", 568 output_name); 569 unlink(oldname); 570 rename(output_name, oldname); 571 } 572 } else if (write_mode == WRITE_APPEND) { 573 write_mode = WRITE_FORCE; 574 } 575 576 flags = O_CREAT|O_RDWR; 577 if (write_mode == WRITE_APPEND) 578 file_new = 0; 579 else 580 flags |= O_TRUNC; 581 582 if (pipe_output) 583 output = STDOUT_FILENO; 584 else 585 output = open(output_name, flags, S_IRUSR | S_IWUSR); 586 if (output < 0) { 587 perror("failed to create output file"); 588 exit(-1); 589 } 590 591 session = perf_session__new(output_name, O_WRONLY, 592 write_mode == WRITE_FORCE, false, NULL); 593 if (session == NULL) { 594 pr_err("Not enough memory for reading perf file header\n"); 595 return -1; 596 } 597 598 if (!no_buildid) 599 perf_header__set_feat(&session->header, HEADER_BUILD_ID); 600 601 if (!file_new) { 602 err = perf_header__read(session, output); 603 if (err < 0) 604 goto out_delete_session; 605 } 606 607 if (have_tracepoints(&evsel_list)) 608 perf_header__set_feat(&session->header, HEADER_TRACE_INFO); 609 610 /* 611 * perf_session__delete(session) will be called at atexit_header() 612 */ 613 atexit(atexit_header); 614 615 if (forks) { 616 child_pid = fork(); 617 if (child_pid < 0) { 618 perror("failed to fork"); 619 exit(-1); 620 } 621 622 if (!child_pid) { 623 if (pipe_output) 624 dup2(2, 1); 625 close(child_ready_pipe[0]); 626 close(go_pipe[1]); 627 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); 628 629 /* 630 * Do a dummy execvp to get the PLT entry resolved, 631 * so we avoid the resolver overhead on the real 632 * execvp call. 633 */ 634 execvp("", (char **)argv); 635 636 /* 637 * Tell the parent we're ready to go 638 */ 639 close(child_ready_pipe[1]); 640 641 /* 642 * Wait until the parent tells us to go. 643 */ 644 if (read(go_pipe[0], &buf, 1) == -1) 645 perror("unable to read pipe"); 646 647 execvp(argv[0], (char **)argv); 648 649 perror(argv[0]); 650 kill(getppid(), SIGUSR1); 651 exit(-1); 652 } 653 654 if (!system_wide && target_tid == -1 && target_pid == -1) 655 threads->map[0] = child_pid; 656 657 close(child_ready_pipe[1]); 658 close(go_pipe[0]); 659 /* 660 * wait for child to settle 661 */ 662 if (read(child_ready_pipe[0], &buf, 1) == -1) { 663 perror("unable to read pipe"); 664 exit(-1); 665 } 666 close(child_ready_pipe[0]); 667 } 668 669 if (!system_wide && no_inherit && !cpu_list) { 670 open_counters(-1); 671 } else { 672 for (i = 0; i < cpus->nr; i++) 673 open_counters(cpus->map[i]); 674 } 675 676 perf_session__set_sample_type(session, sample_type); 677 678 if (pipe_output) { 679 err = perf_header__write_pipe(output); 680 if (err < 0) 681 return err; 682 } else if (file_new) { 683 err = perf_header__write(&session->header, output, false); 684 if (err < 0) 685 return err; 686 } 687 688 post_processing_offset = lseek(output, 0, SEEK_CUR); 689 690 perf_session__set_sample_id_all(session, sample_id_all_avail); 691 692 if (pipe_output) { 693 err = event__synthesize_attrs(&session->header, 694 process_synthesized_event, 695 session); 696 if (err < 0) { 697 pr_err("Couldn't synthesize attrs.\n"); 698 return err; 699 } 700 701 err = event__synthesize_event_types(process_synthesized_event, 702 session); 703 if (err < 0) { 704 pr_err("Couldn't synthesize event_types.\n"); 705 return err; 706 } 707 708 if (have_tracepoints(&evsel_list)) { 709 /* 710 * FIXME err <= 0 here actually means that 711 * there were no tracepoints so its not really 712 * an error, just that we don't need to 713 * synthesize anything. We really have to 714 * return this more properly and also 715 * propagate errors that now are calling die() 716 */ 717 err = event__synthesize_tracing_data(output, &evsel_list, 718 process_synthesized_event, 719 session); 720 if (err <= 0) { 721 pr_err("Couldn't record tracing data.\n"); 722 return err; 723 } 724 advance_output(err); 725 } 726 } 727 728 machine = perf_session__find_host_machine(session); 729 if (!machine) { 730 pr_err("Couldn't find native kernel information.\n"); 731 return -1; 732 } 733 734 err = event__synthesize_kernel_mmap(process_synthesized_event, 735 session, machine, "_text"); 736 if (err < 0) 737 err = event__synthesize_kernel_mmap(process_synthesized_event, 738 session, machine, "_stext"); 739 if (err < 0) 740 pr_err("Couldn't record kernel reference relocation symbol\n" 741 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 742 "Check /proc/kallsyms permission or run as root.\n"); 743 744 err = event__synthesize_modules(process_synthesized_event, 745 session, machine); 746 if (err < 0) 747 pr_err("Couldn't record kernel module information.\n" 748 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 749 "Check /proc/modules permission or run as root.\n"); 750 751 if (perf_guest) 752 perf_session__process_machines(session, event__synthesize_guest_os); 753 754 if (!system_wide) 755 event__synthesize_thread(target_tid, process_synthesized_event, 756 session); 757 else 758 event__synthesize_threads(process_synthesized_event, session); 759 760 if (realtime_prio) { 761 struct sched_param param; 762 763 param.sched_priority = realtime_prio; 764 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { 765 pr_err("Could not set realtime priority.\n"); 766 exit(-1); 767 } 768 } 769 770 /* 771 * Let the child rip 772 */ 773 if (forks) 774 close(go_pipe[1]); 775 776 for (;;) { 777 int hits = samples; 778 int thread; 779 780 mmap_read_all(); 781 782 if (hits == samples) { 783 if (done) 784 break; 785 err = poll(event_array, nr_poll, -1); 786 waking++; 787 } 788 789 if (done) { 790 for (i = 0; i < nr_cpu; i++) { 791 struct perf_evsel *pos; 792 793 list_for_each_entry(pos, &evsel_list, node) { 794 for (thread = 0; 795 thread < threads->nr; 796 thread++) 797 ioctl(FD(pos, i, thread), 798 PERF_EVENT_IOC_DISABLE); 799 } 800 } 801 } 802 } 803 804 if (quiet || signr == SIGUSR1) 805 return 0; 806 807 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); 808 809 /* 810 * Approximate RIP event size: 24 bytes. 811 */ 812 fprintf(stderr, 813 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n", 814 (double)bytes_written / 1024.0 / 1024.0, 815 output_name, 816 bytes_written / 24); 817 818 return 0; 819 820 out_delete_session: 821 perf_session__delete(session); 822 return err; 823 } 824 825 static const char * const record_usage[] = { 826 "perf record [<options>] [<command>]", 827 "perf record [<options>] -- <command> [<options>]", 828 NULL 829 }; 830 831 static bool force, append_file; 832 833 const struct option record_options[] = { 834 OPT_CALLBACK('e', "event", NULL, "event", 835 "event selector. use 'perf list' to list available events", 836 parse_events), 837 OPT_CALLBACK(0, "filter", NULL, "filter", 838 "event filter", parse_filter), 839 OPT_INTEGER('p', "pid", &target_pid, 840 "record events on existing process id"), 841 OPT_INTEGER('t', "tid", &target_tid, 842 "record events on existing thread id"), 843 OPT_INTEGER('r', "realtime", &realtime_prio, 844 "collect data with this RT SCHED_FIFO priority"), 845 OPT_BOOLEAN('R', "raw-samples", &raw_samples, 846 "collect raw sample records from all opened counters"), 847 OPT_BOOLEAN('a', "all-cpus", &system_wide, 848 "system-wide collection from all CPUs"), 849 OPT_BOOLEAN('A', "append", &append_file, 850 "append to the output file to do incremental profiling"), 851 OPT_STRING('C', "cpu", &cpu_list, "cpu", 852 "list of cpus to monitor"), 853 OPT_BOOLEAN('f', "force", &force, 854 "overwrite existing data file (deprecated)"), 855 OPT_U64('c', "count", &user_interval, "event period to sample"), 856 OPT_STRING('o', "output", &output_name, "file", 857 "output file name"), 858 OPT_BOOLEAN('i', "no-inherit", &no_inherit, 859 "child tasks do not inherit counters"), 860 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), 861 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), 862 OPT_BOOLEAN('g', "call-graph", &call_graph, 863 "do call-graph (stack chain/backtrace) recording"), 864 OPT_INCR('v', "verbose", &verbose, 865 "be more verbose (show counter open errors, etc)"), 866 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), 867 OPT_BOOLEAN('s', "stat", &inherit_stat, 868 "per thread counts"), 869 OPT_BOOLEAN('d', "data", &sample_address, 870 "Sample addresses"), 871 OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"), 872 OPT_BOOLEAN('n', "no-samples", &no_samples, 873 "don't sample"), 874 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, 875 "do not update the buildid cache"), 876 OPT_BOOLEAN('B', "no-buildid", &no_buildid, 877 "do not collect buildids in perf.data"), 878 OPT_END() 879 }; 880 881 int cmd_record(int argc, const char **argv, const char *prefix __used) 882 { 883 int err = -ENOMEM; 884 struct perf_evsel *pos; 885 886 argc = parse_options(argc, argv, record_options, record_usage, 887 PARSE_OPT_STOP_AT_NON_OPTION); 888 if (!argc && target_pid == -1 && target_tid == -1 && 889 !system_wide && !cpu_list) 890 usage_with_options(record_usage, record_options); 891 892 if (force && append_file) { 893 fprintf(stderr, "Can't overwrite and append at the same time." 894 " You need to choose between -f and -A"); 895 usage_with_options(record_usage, record_options); 896 } else if (append_file) { 897 write_mode = WRITE_APPEND; 898 } else { 899 write_mode = WRITE_FORCE; 900 } 901 902 symbol__init(); 903 904 if (no_buildid_cache || no_buildid) 905 disable_buildid_cache(); 906 907 if (list_empty(&evsel_list) && perf_evsel_list__create_default() < 0) { 908 pr_err("Not enough memory for event selector list\n"); 909 goto out_symbol_exit; 910 } 911 912 if (target_pid != -1) 913 target_tid = target_pid; 914 915 threads = thread_map__new(target_pid, target_tid); 916 if (threads == NULL) { 917 pr_err("Problems finding threads of monitor\n"); 918 usage_with_options(record_usage, record_options); 919 } 920 921 cpus = cpu_map__new(cpu_list); 922 if (cpus == NULL) { 923 perror("failed to parse CPUs map"); 924 return -1; 925 } 926 927 list_for_each_entry(pos, &evsel_list, node) { 928 if (perf_evsel__alloc_fd(pos, cpus->nr, threads->nr) < 0) 929 goto out_free_fd; 930 } 931 event_array = malloc((sizeof(struct pollfd) * MAX_NR_CPUS * 932 MAX_COUNTERS * threads->nr)); 933 if (!event_array) 934 goto out_free_fd; 935 936 if (user_interval != ULLONG_MAX) 937 default_interval = user_interval; 938 if (user_freq != UINT_MAX) 939 freq = user_freq; 940 941 /* 942 * User specified count overrides default frequency. 943 */ 944 if (default_interval) 945 freq = 0; 946 else if (freq) { 947 default_interval = freq; 948 } else { 949 fprintf(stderr, "frequency and count are zero, aborting\n"); 950 err = -EINVAL; 951 goto out_free_event_array; 952 } 953 954 err = __cmd_record(argc, argv); 955 956 out_free_event_array: 957 free(event_array); 958 out_free_fd: 959 thread_map__delete(threads); 960 threads = NULL; 961 out_symbol_exit: 962 symbol__exit(); 963 return err; 964 } 965