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/evlist.h" 22 #include "util/evsel.h" 23 #include "util/debug.h" 24 #include "util/session.h" 25 #include "util/symbol.h" 26 #include "util/cpumap.h" 27 #include "util/thread_map.h" 28 29 #include <unistd.h> 30 #include <sched.h> 31 #include <sys/mman.h> 32 33 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) 34 35 enum write_mode_t { 36 WRITE_FORCE, 37 WRITE_APPEND 38 }; 39 40 static u64 user_interval = ULLONG_MAX; 41 static u64 default_interval = 0; 42 43 static unsigned int page_size; 44 static unsigned int mmap_pages = UINT_MAX; 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 = NULL; 50 static int group = 0; 51 static int realtime_prio = 0; 52 static bool nodelay = false; 53 static bool raw_samples = false; 54 static bool sample_id_all_avail = true; 55 static bool system_wide = false; 56 static pid_t target_pid = -1; 57 static pid_t target_tid = -1; 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 static struct perf_evlist *evsel_list; 69 70 static long samples = 0; 71 static u64 bytes_written = 0; 72 73 static int file_new = 1; 74 static off_t post_processing_offset; 75 76 static struct perf_session *session; 77 static const char *cpu_list; 78 79 static void advance_output(size_t size) 80 { 81 bytes_written += size; 82 } 83 84 static void write_output(void *buf, size_t size) 85 { 86 while (size) { 87 int ret = write(output, buf, size); 88 89 if (ret < 0) 90 die("failed to write"); 91 92 size -= ret; 93 buf += ret; 94 95 bytes_written += ret; 96 } 97 } 98 99 static int process_synthesized_event(union perf_event *event, 100 struct perf_sample *sample __used, 101 struct perf_session *self __used) 102 { 103 write_output(event, event->header.size); 104 return 0; 105 } 106 107 static void mmap_read(struct perf_mmap *md) 108 { 109 unsigned int head = perf_mmap__read_head(md); 110 unsigned int old = md->prev; 111 unsigned char *data = md->base + page_size; 112 unsigned long size; 113 void *buf; 114 115 if (old == head) 116 return; 117 118 samples++; 119 120 size = head - old; 121 122 if ((old & md->mask) + size != (head & md->mask)) { 123 buf = &data[old & md->mask]; 124 size = md->mask + 1 - (old & md->mask); 125 old += size; 126 127 write_output(buf, size); 128 } 129 130 buf = &data[old & md->mask]; 131 size = head - old; 132 old += size; 133 134 write_output(buf, size); 135 136 md->prev = old; 137 perf_mmap__write_tail(md, old); 138 } 139 140 static volatile int done = 0; 141 static volatile int signr = -1; 142 143 static void sig_handler(int sig) 144 { 145 done = 1; 146 signr = sig; 147 } 148 149 static void sig_atexit(void) 150 { 151 if (child_pid > 0) 152 kill(child_pid, SIGTERM); 153 154 if (signr == -1 || signr == SIGUSR1) 155 return; 156 157 signal(signr, SIG_DFL); 158 kill(getpid(), signr); 159 } 160 161 static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist) 162 { 163 struct perf_event_attr *attr = &evsel->attr; 164 int track = !evsel->idx; /* only the first counter needs these */ 165 166 attr->inherit = !no_inherit; 167 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | 168 PERF_FORMAT_TOTAL_TIME_RUNNING | 169 PERF_FORMAT_ID; 170 171 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; 172 173 if (evlist->nr_entries > 1) 174 attr->sample_type |= PERF_SAMPLE_ID; 175 176 /* 177 * We default some events to a 1 default interval. But keep 178 * it a weak assumption overridable by the user. 179 */ 180 if (!attr->sample_period || (user_freq != UINT_MAX && 181 user_interval != ULLONG_MAX)) { 182 if (freq) { 183 attr->sample_type |= PERF_SAMPLE_PERIOD; 184 attr->freq = 1; 185 attr->sample_freq = freq; 186 } else { 187 attr->sample_period = default_interval; 188 } 189 } 190 191 if (no_samples) 192 attr->sample_freq = 0; 193 194 if (inherit_stat) 195 attr->inherit_stat = 1; 196 197 if (sample_address) { 198 attr->sample_type |= PERF_SAMPLE_ADDR; 199 attr->mmap_data = track; 200 } 201 202 if (call_graph) 203 attr->sample_type |= PERF_SAMPLE_CALLCHAIN; 204 205 if (system_wide) 206 attr->sample_type |= PERF_SAMPLE_CPU; 207 208 if (sample_id_all_avail && 209 (sample_time || system_wide || !no_inherit || cpu_list)) 210 attr->sample_type |= PERF_SAMPLE_TIME; 211 212 if (raw_samples) { 213 attr->sample_type |= PERF_SAMPLE_TIME; 214 attr->sample_type |= PERF_SAMPLE_RAW; 215 attr->sample_type |= PERF_SAMPLE_CPU; 216 } 217 218 if (nodelay) { 219 attr->watermark = 0; 220 attr->wakeup_events = 1; 221 } 222 223 attr->mmap = track; 224 attr->comm = track; 225 226 if (target_pid == -1 && target_tid == -1 && !system_wide) { 227 attr->disabled = 1; 228 attr->enable_on_exec = 1; 229 } 230 } 231 232 static bool perf_evlist__equal(struct perf_evlist *evlist, 233 struct perf_evlist *other) 234 { 235 struct perf_evsel *pos, *pair; 236 237 if (evlist->nr_entries != other->nr_entries) 238 return false; 239 240 pair = list_entry(other->entries.next, struct perf_evsel, node); 241 242 list_for_each_entry(pos, &evlist->entries, node) { 243 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0)) 244 return false; 245 pair = list_entry(pair->node.next, struct perf_evsel, node); 246 } 247 248 return true; 249 } 250 251 static void open_counters(struct perf_evlist *evlist) 252 { 253 struct perf_evsel *pos; 254 255 if (evlist->cpus->map[0] < 0) 256 no_inherit = true; 257 258 list_for_each_entry(pos, &evlist->entries, node) { 259 struct perf_event_attr *attr = &pos->attr; 260 /* 261 * Check if parse_single_tracepoint_event has already asked for 262 * PERF_SAMPLE_TIME. 263 * 264 * XXX this is kludgy but short term fix for problems introduced by 265 * eac23d1c that broke 'perf script' by having different sample_types 266 * when using multiple tracepoint events when we use a perf binary 267 * that tries to use sample_id_all on an older kernel. 268 * 269 * We need to move counter creation to perf_session, support 270 * different sample_types, etc. 271 */ 272 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME; 273 274 config_attr(pos, evlist); 275 retry_sample_id: 276 attr->sample_id_all = sample_id_all_avail ? 1 : 0; 277 try_again: 278 if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group) < 0) { 279 int err = errno; 280 281 if (err == EPERM || err == EACCES) { 282 ui__warning_paranoid(); 283 exit(EXIT_FAILURE); 284 } else if (err == ENODEV && cpu_list) { 285 die("No such device - did you specify" 286 " an out-of-range profile CPU?\n"); 287 } else if (err == EINVAL && sample_id_all_avail) { 288 /* 289 * Old kernel, no attr->sample_id_type_all field 290 */ 291 sample_id_all_avail = false; 292 if (!sample_time && !raw_samples && !time_needed) 293 attr->sample_type &= ~PERF_SAMPLE_TIME; 294 295 goto retry_sample_id; 296 } 297 298 /* 299 * If it's cycles then fall back to hrtimer 300 * based cpu-clock-tick sw counter, which 301 * is always available even if no PMU support: 302 */ 303 if (attr->type == PERF_TYPE_HARDWARE 304 && attr->config == PERF_COUNT_HW_CPU_CYCLES) { 305 306 if (verbose) 307 ui__warning("The cycles event is not supported, " 308 "trying to fall back to cpu-clock-ticks\n"); 309 attr->type = PERF_TYPE_SOFTWARE; 310 attr->config = PERF_COUNT_SW_CPU_CLOCK; 311 goto try_again; 312 } 313 314 if (err == ENOENT) { 315 ui__warning("The %s event is not supported.\n", 316 event_name(pos)); 317 exit(EXIT_FAILURE); 318 } 319 320 printf("\n"); 321 error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", 322 err, strerror(err)); 323 324 #if defined(__i386__) || defined(__x86_64__) 325 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) 326 die("No hardware sampling interrupt available." 327 " No APIC? If so then you can boot the kernel" 328 " with the \"lapic\" boot parameter to" 329 " force-enable it.\n"); 330 #endif 331 332 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); 333 } 334 } 335 336 if (perf_evlist__set_filters(evlist)) { 337 error("failed to set filter with %d (%s)\n", errno, 338 strerror(errno)); 339 exit(-1); 340 } 341 342 if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) 343 die("failed to mmap with %d (%s)\n", errno, strerror(errno)); 344 345 if (file_new) 346 session->evlist = evlist; 347 else { 348 if (!perf_evlist__equal(session->evlist, evlist)) { 349 fprintf(stderr, "incompatible append\n"); 350 exit(-1); 351 } 352 } 353 354 perf_session__update_sample_type(session); 355 } 356 357 static int process_buildids(void) 358 { 359 u64 size = lseek(output, 0, SEEK_CUR); 360 361 if (size == 0) 362 return 0; 363 364 session->fd = output; 365 return __perf_session__process_events(session, post_processing_offset, 366 size - post_processing_offset, 367 size, &build_id__mark_dso_hit_ops); 368 } 369 370 static void atexit_header(void) 371 { 372 if (!pipe_output) { 373 session->header.data_size += bytes_written; 374 375 if (!no_buildid) 376 process_buildids(); 377 perf_session__write_header(session, evsel_list, output, true); 378 perf_session__delete(session); 379 perf_evlist__delete(evsel_list); 380 symbol__exit(); 381 } 382 } 383 384 static void perf_event__synthesize_guest_os(struct machine *machine, void *data) 385 { 386 int err; 387 struct perf_session *psession = data; 388 389 if (machine__is_host(machine)) 390 return; 391 392 /* 393 *As for guest kernel when processing subcommand record&report, 394 *we arrange module mmap prior to guest kernel mmap and trigger 395 *a preload dso because default guest module symbols are loaded 396 *from guest kallsyms instead of /lib/modules/XXX/XXX. This 397 *method is used to avoid symbol missing when the first addr is 398 *in module instead of in guest kernel. 399 */ 400 err = perf_event__synthesize_modules(process_synthesized_event, 401 psession, machine); 402 if (err < 0) 403 pr_err("Couldn't record guest kernel [%d]'s reference" 404 " relocation symbol.\n", machine->pid); 405 406 /* 407 * We use _stext for guest kernel because guest kernel's /proc/kallsyms 408 * have no _text sometimes. 409 */ 410 err = perf_event__synthesize_kernel_mmap(process_synthesized_event, 411 psession, machine, "_text"); 412 if (err < 0) 413 err = perf_event__synthesize_kernel_mmap(process_synthesized_event, 414 psession, machine, 415 "_stext"); 416 if (err < 0) 417 pr_err("Couldn't record guest kernel [%d]'s reference" 418 " relocation symbol.\n", machine->pid); 419 } 420 421 static struct perf_event_header finished_round_event = { 422 .size = sizeof(struct perf_event_header), 423 .type = PERF_RECORD_FINISHED_ROUND, 424 }; 425 426 static void mmap_read_all(void) 427 { 428 int i; 429 430 for (i = 0; i < evsel_list->nr_mmaps; i++) { 431 if (evsel_list->mmap[i].base) 432 mmap_read(&evsel_list->mmap[i]); 433 } 434 435 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) 436 write_output(&finished_round_event, sizeof(finished_round_event)); 437 } 438 439 static int __cmd_record(int argc, const char **argv) 440 { 441 int i; 442 struct stat st; 443 int flags; 444 int err; 445 unsigned long waking = 0; 446 int child_ready_pipe[2], go_pipe[2]; 447 const bool forks = argc > 0; 448 char buf; 449 struct machine *machine; 450 451 page_size = sysconf(_SC_PAGE_SIZE); 452 453 atexit(sig_atexit); 454 signal(SIGCHLD, sig_handler); 455 signal(SIGINT, sig_handler); 456 signal(SIGUSR1, sig_handler); 457 458 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { 459 perror("failed to create pipes"); 460 exit(-1); 461 } 462 463 if (!output_name) { 464 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode)) 465 pipe_output = 1; 466 else 467 output_name = "perf.data"; 468 } 469 if (output_name) { 470 if (!strcmp(output_name, "-")) 471 pipe_output = 1; 472 else if (!stat(output_name, &st) && st.st_size) { 473 if (write_mode == WRITE_FORCE) { 474 char oldname[PATH_MAX]; 475 snprintf(oldname, sizeof(oldname), "%s.old", 476 output_name); 477 unlink(oldname); 478 rename(output_name, oldname); 479 } 480 } else if (write_mode == WRITE_APPEND) { 481 write_mode = WRITE_FORCE; 482 } 483 } 484 485 flags = O_CREAT|O_RDWR; 486 if (write_mode == WRITE_APPEND) 487 file_new = 0; 488 else 489 flags |= O_TRUNC; 490 491 if (pipe_output) 492 output = STDOUT_FILENO; 493 else 494 output = open(output_name, flags, S_IRUSR | S_IWUSR); 495 if (output < 0) { 496 perror("failed to create output file"); 497 exit(-1); 498 } 499 500 session = perf_session__new(output_name, O_WRONLY, 501 write_mode == WRITE_FORCE, false, NULL); 502 if (session == NULL) { 503 pr_err("Not enough memory for reading perf file header\n"); 504 return -1; 505 } 506 507 if (!no_buildid) 508 perf_header__set_feat(&session->header, HEADER_BUILD_ID); 509 510 if (!file_new) { 511 err = perf_session__read_header(session, output); 512 if (err < 0) 513 goto out_delete_session; 514 } 515 516 if (have_tracepoints(&evsel_list->entries)) 517 perf_header__set_feat(&session->header, HEADER_TRACE_INFO); 518 519 /* 512 kiB: default amount of unprivileged mlocked memory */ 520 if (mmap_pages == UINT_MAX) 521 mmap_pages = (512 * 1024) / page_size; 522 523 if (forks) { 524 child_pid = fork(); 525 if (child_pid < 0) { 526 perror("failed to fork"); 527 exit(-1); 528 } 529 530 if (!child_pid) { 531 if (pipe_output) 532 dup2(2, 1); 533 close(child_ready_pipe[0]); 534 close(go_pipe[1]); 535 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); 536 537 /* 538 * Do a dummy execvp to get the PLT entry resolved, 539 * so we avoid the resolver overhead on the real 540 * execvp call. 541 */ 542 execvp("", (char **)argv); 543 544 /* 545 * Tell the parent we're ready to go 546 */ 547 close(child_ready_pipe[1]); 548 549 /* 550 * Wait until the parent tells us to go. 551 */ 552 if (read(go_pipe[0], &buf, 1) == -1) 553 perror("unable to read pipe"); 554 555 execvp(argv[0], (char **)argv); 556 557 perror(argv[0]); 558 kill(getppid(), SIGUSR1); 559 exit(-1); 560 } 561 562 if (!system_wide && target_tid == -1 && target_pid == -1) 563 evsel_list->threads->map[0] = child_pid; 564 565 close(child_ready_pipe[1]); 566 close(go_pipe[0]); 567 /* 568 * wait for child to settle 569 */ 570 if (read(child_ready_pipe[0], &buf, 1) == -1) { 571 perror("unable to read pipe"); 572 exit(-1); 573 } 574 close(child_ready_pipe[0]); 575 } 576 577 open_counters(evsel_list); 578 579 /* 580 * perf_session__delete(session) will be called at atexit_header() 581 */ 582 atexit(atexit_header); 583 584 if (pipe_output) { 585 err = perf_header__write_pipe(output); 586 if (err < 0) 587 return err; 588 } else if (file_new) { 589 err = perf_session__write_header(session, evsel_list, 590 output, false); 591 if (err < 0) 592 return err; 593 } 594 595 post_processing_offset = lseek(output, 0, SEEK_CUR); 596 597 if (pipe_output) { 598 err = perf_session__synthesize_attrs(session, 599 process_synthesized_event); 600 if (err < 0) { 601 pr_err("Couldn't synthesize attrs.\n"); 602 return err; 603 } 604 605 err = perf_event__synthesize_event_types(process_synthesized_event, 606 session); 607 if (err < 0) { 608 pr_err("Couldn't synthesize event_types.\n"); 609 return err; 610 } 611 612 if (have_tracepoints(&evsel_list->entries)) { 613 /* 614 * FIXME err <= 0 here actually means that 615 * there were no tracepoints so its not really 616 * an error, just that we don't need to 617 * synthesize anything. We really have to 618 * return this more properly and also 619 * propagate errors that now are calling die() 620 */ 621 err = perf_event__synthesize_tracing_data(output, evsel_list, 622 process_synthesized_event, 623 session); 624 if (err <= 0) { 625 pr_err("Couldn't record tracing data.\n"); 626 return err; 627 } 628 advance_output(err); 629 } 630 } 631 632 machine = perf_session__find_host_machine(session); 633 if (!machine) { 634 pr_err("Couldn't find native kernel information.\n"); 635 return -1; 636 } 637 638 err = perf_event__synthesize_kernel_mmap(process_synthesized_event, 639 session, machine, "_text"); 640 if (err < 0) 641 err = perf_event__synthesize_kernel_mmap(process_synthesized_event, 642 session, machine, "_stext"); 643 if (err < 0) 644 pr_err("Couldn't record kernel reference relocation symbol\n" 645 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 646 "Check /proc/kallsyms permission or run as root.\n"); 647 648 err = perf_event__synthesize_modules(process_synthesized_event, 649 session, machine); 650 if (err < 0) 651 pr_err("Couldn't record kernel module information.\n" 652 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 653 "Check /proc/modules permission or run as root.\n"); 654 655 if (perf_guest) 656 perf_session__process_machines(session, 657 perf_event__synthesize_guest_os); 658 659 if (!system_wide) 660 perf_event__synthesize_thread_map(evsel_list->threads, 661 process_synthesized_event, 662 session); 663 else 664 perf_event__synthesize_threads(process_synthesized_event, 665 session); 666 667 if (realtime_prio) { 668 struct sched_param param; 669 670 param.sched_priority = realtime_prio; 671 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { 672 pr_err("Could not set realtime priority.\n"); 673 exit(-1); 674 } 675 } 676 677 /* 678 * Let the child rip 679 */ 680 if (forks) 681 close(go_pipe[1]); 682 683 for (;;) { 684 int hits = samples; 685 int thread; 686 687 mmap_read_all(); 688 689 if (hits == samples) { 690 if (done) 691 break; 692 err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1); 693 waking++; 694 } 695 696 if (done) { 697 for (i = 0; i < evsel_list->cpus->nr; i++) { 698 struct perf_evsel *pos; 699 700 list_for_each_entry(pos, &evsel_list->entries, node) { 701 for (thread = 0; 702 thread < evsel_list->threads->nr; 703 thread++) 704 ioctl(FD(pos, i, thread), 705 PERF_EVENT_IOC_DISABLE); 706 } 707 } 708 } 709 } 710 711 if (quiet || signr == SIGUSR1) 712 return 0; 713 714 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); 715 716 /* 717 * Approximate RIP event size: 24 bytes. 718 */ 719 fprintf(stderr, 720 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n", 721 (double)bytes_written / 1024.0 / 1024.0, 722 output_name, 723 bytes_written / 24); 724 725 return 0; 726 727 out_delete_session: 728 perf_session__delete(session); 729 return err; 730 } 731 732 static const char * const record_usage[] = { 733 "perf record [<options>] [<command>]", 734 "perf record [<options>] -- <command> [<options>]", 735 NULL 736 }; 737 738 static bool force, append_file; 739 740 const struct option record_options[] = { 741 OPT_CALLBACK('e', "event", &evsel_list, "event", 742 "event selector. use 'perf list' to list available events", 743 parse_events), 744 OPT_CALLBACK(0, "filter", &evsel_list, "filter", 745 "event filter", parse_filter), 746 OPT_INTEGER('p', "pid", &target_pid, 747 "record events on existing process id"), 748 OPT_INTEGER('t', "tid", &target_tid, 749 "record events on existing thread id"), 750 OPT_INTEGER('r', "realtime", &realtime_prio, 751 "collect data with this RT SCHED_FIFO priority"), 752 OPT_BOOLEAN('D', "no-delay", &nodelay, 753 "collect data without buffering"), 754 OPT_BOOLEAN('R', "raw-samples", &raw_samples, 755 "collect raw sample records from all opened counters"), 756 OPT_BOOLEAN('a', "all-cpus", &system_wide, 757 "system-wide collection from all CPUs"), 758 OPT_BOOLEAN('A', "append", &append_file, 759 "append to the output file to do incremental profiling"), 760 OPT_STRING('C', "cpu", &cpu_list, "cpu", 761 "list of cpus to monitor"), 762 OPT_BOOLEAN('f', "force", &force, 763 "overwrite existing data file (deprecated)"), 764 OPT_U64('c', "count", &user_interval, "event period to sample"), 765 OPT_STRING('o', "output", &output_name, "file", 766 "output file name"), 767 OPT_BOOLEAN('i', "no-inherit", &no_inherit, 768 "child tasks do not inherit counters"), 769 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), 770 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), 771 OPT_BOOLEAN('g', "call-graph", &call_graph, 772 "do call-graph (stack chain/backtrace) recording"), 773 OPT_INCR('v', "verbose", &verbose, 774 "be more verbose (show counter open errors, etc)"), 775 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), 776 OPT_BOOLEAN('s', "stat", &inherit_stat, 777 "per thread counts"), 778 OPT_BOOLEAN('d', "data", &sample_address, 779 "Sample addresses"), 780 OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"), 781 OPT_BOOLEAN('n', "no-samples", &no_samples, 782 "don't sample"), 783 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, 784 "do not update the buildid cache"), 785 OPT_BOOLEAN('B', "no-buildid", &no_buildid, 786 "do not collect buildids in perf.data"), 787 OPT_CALLBACK('G', "cgroup", &evsel_list, "name", 788 "monitor event in cgroup name only", 789 parse_cgroups), 790 OPT_END() 791 }; 792 793 int cmd_record(int argc, const char **argv, const char *prefix __used) 794 { 795 int err = -ENOMEM; 796 struct perf_evsel *pos; 797 798 evsel_list = perf_evlist__new(NULL, NULL); 799 if (evsel_list == NULL) 800 return -ENOMEM; 801 802 argc = parse_options(argc, argv, record_options, record_usage, 803 PARSE_OPT_STOP_AT_NON_OPTION); 804 if (!argc && target_pid == -1 && target_tid == -1 && 805 !system_wide && !cpu_list) 806 usage_with_options(record_usage, record_options); 807 808 if (force && append_file) { 809 fprintf(stderr, "Can't overwrite and append at the same time." 810 " You need to choose between -f and -A"); 811 usage_with_options(record_usage, record_options); 812 } else if (append_file) { 813 write_mode = WRITE_APPEND; 814 } else { 815 write_mode = WRITE_FORCE; 816 } 817 818 if (nr_cgroups && !system_wide) { 819 fprintf(stderr, "cgroup monitoring only available in" 820 " system-wide mode\n"); 821 usage_with_options(record_usage, record_options); 822 } 823 824 symbol__init(); 825 826 if (no_buildid_cache || no_buildid) 827 disable_buildid_cache(); 828 829 if (evsel_list->nr_entries == 0 && 830 perf_evlist__add_default(evsel_list) < 0) { 831 pr_err("Not enough memory for event selector list\n"); 832 goto out_symbol_exit; 833 } 834 835 if (target_pid != -1) 836 target_tid = target_pid; 837 838 if (perf_evlist__create_maps(evsel_list, target_pid, 839 target_tid, cpu_list) < 0) 840 usage_with_options(record_usage, record_options); 841 842 list_for_each_entry(pos, &evsel_list->entries, node) { 843 if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, 844 evsel_list->threads->nr) < 0) 845 goto out_free_fd; 846 if (perf_header__push_event(pos->attr.config, event_name(pos))) 847 goto out_free_fd; 848 } 849 850 if (perf_evlist__alloc_pollfd(evsel_list) < 0) 851 goto out_free_fd; 852 853 if (user_interval != ULLONG_MAX) 854 default_interval = user_interval; 855 if (user_freq != UINT_MAX) 856 freq = user_freq; 857 858 /* 859 * User specified count overrides default frequency. 860 */ 861 if (default_interval) 862 freq = 0; 863 else if (freq) { 864 default_interval = freq; 865 } else { 866 fprintf(stderr, "frequency and count are zero, aborting\n"); 867 err = -EINVAL; 868 goto out_free_fd; 869 } 870 871 err = __cmd_record(argc, argv); 872 out_free_fd: 873 perf_evlist__delete_maps(evsel_list); 874 out_symbol_exit: 875 symbol__exit(); 876 return err; 877 } 878