1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * builtin-record.c 4 * 5 * Builtin record command: Record the profile of a workload 6 * (or a CPU, or a PID) into the perf.data output file - for 7 * later analysis via perf report. 8 */ 9 #include "builtin.h" 10 11 #include "util/build-id.h" 12 #include <subcmd/parse-options.h> 13 #include "util/parse-events.h" 14 #include "util/config.h" 15 16 #include "util/callchain.h" 17 #include "util/cgroup.h" 18 #include "util/header.h" 19 #include "util/event.h" 20 #include "util/evlist.h" 21 #include "util/evsel.h" 22 #include "util/debug.h" 23 #include "util/mmap.h" 24 #include "util/target.h" 25 #include "util/session.h" 26 #include "util/tool.h" 27 #include "util/symbol.h" 28 #include "util/record.h" 29 #include "util/cpumap.h" 30 #include "util/thread_map.h" 31 #include "util/data.h" 32 #include "util/perf_regs.h" 33 #include "util/auxtrace.h" 34 #include "util/tsc.h" 35 #include "util/parse-branch-options.h" 36 #include "util/parse-regs-options.h" 37 #include "util/perf_api_probe.h" 38 #include "util/llvm-utils.h" 39 #include "util/bpf-loader.h" 40 #include "util/trigger.h" 41 #include "util/perf-hooks.h" 42 #include "util/cpu-set-sched.h" 43 #include "util/synthetic-events.h" 44 #include "util/time-utils.h" 45 #include "util/units.h" 46 #include "util/bpf-event.h" 47 #include "util/util.h" 48 #include "util/pfm.h" 49 #include "util/clockid.h" 50 #include "util/pmu-hybrid.h" 51 #include "util/evlist-hybrid.h" 52 #include "asm/bug.h" 53 #include "perf.h" 54 55 #include <errno.h> 56 #include <inttypes.h> 57 #include <locale.h> 58 #include <poll.h> 59 #include <pthread.h> 60 #include <unistd.h> 61 #include <sched.h> 62 #include <signal.h> 63 #ifdef HAVE_EVENTFD_SUPPORT 64 #include <sys/eventfd.h> 65 #endif 66 #include <sys/mman.h> 67 #include <sys/wait.h> 68 #include <sys/types.h> 69 #include <sys/stat.h> 70 #include <fcntl.h> 71 #include <linux/err.h> 72 #include <linux/string.h> 73 #include <linux/time64.h> 74 #include <linux/zalloc.h> 75 #include <linux/bitmap.h> 76 #include <sys/time.h> 77 78 struct switch_output { 79 bool enabled; 80 bool signal; 81 unsigned long size; 82 unsigned long time; 83 const char *str; 84 bool set; 85 char **filenames; 86 int num_files; 87 int cur_file; 88 }; 89 90 struct record { 91 struct perf_tool tool; 92 struct record_opts opts; 93 u64 bytes_written; 94 struct perf_data data; 95 struct auxtrace_record *itr; 96 struct evlist *evlist; 97 struct perf_session *session; 98 struct evlist *sb_evlist; 99 pthread_t thread_id; 100 int realtime_prio; 101 bool switch_output_event_set; 102 bool no_buildid; 103 bool no_buildid_set; 104 bool no_buildid_cache; 105 bool no_buildid_cache_set; 106 bool buildid_all; 107 bool buildid_mmap; 108 bool timestamp_filename; 109 bool timestamp_boundary; 110 struct switch_output switch_output; 111 unsigned long long samples; 112 struct mmap_cpu_mask affinity_mask; 113 unsigned long output_max_size; /* = 0: unlimited */ 114 }; 115 116 static volatile int done; 117 118 static volatile int auxtrace_record__snapshot_started; 119 static DEFINE_TRIGGER(auxtrace_snapshot_trigger); 120 static DEFINE_TRIGGER(switch_output_trigger); 121 122 static const char *affinity_tags[PERF_AFFINITY_MAX] = { 123 "SYS", "NODE", "CPU" 124 }; 125 126 static bool switch_output_signal(struct record *rec) 127 { 128 return rec->switch_output.signal && 129 trigger_is_ready(&switch_output_trigger); 130 } 131 132 static bool switch_output_size(struct record *rec) 133 { 134 return rec->switch_output.size && 135 trigger_is_ready(&switch_output_trigger) && 136 (rec->bytes_written >= rec->switch_output.size); 137 } 138 139 static bool switch_output_time(struct record *rec) 140 { 141 return rec->switch_output.time && 142 trigger_is_ready(&switch_output_trigger); 143 } 144 145 static bool record__output_max_size_exceeded(struct record *rec) 146 { 147 return rec->output_max_size && 148 (rec->bytes_written >= rec->output_max_size); 149 } 150 151 static int record__write(struct record *rec, struct mmap *map __maybe_unused, 152 void *bf, size_t size) 153 { 154 struct perf_data_file *file = &rec->session->data->file; 155 156 if (perf_data_file__write(file, bf, size) < 0) { 157 pr_err("failed to write perf data, error: %m\n"); 158 return -1; 159 } 160 161 rec->bytes_written += size; 162 163 if (record__output_max_size_exceeded(rec) && !done) { 164 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB)," 165 " stopping session ]\n", 166 rec->bytes_written >> 10); 167 done = 1; 168 } 169 170 if (switch_output_size(rec)) 171 trigger_hit(&switch_output_trigger); 172 173 return 0; 174 } 175 176 static int record__aio_enabled(struct record *rec); 177 static int record__comp_enabled(struct record *rec); 178 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size, 179 void *src, size_t src_size); 180 181 #ifdef HAVE_AIO_SUPPORT 182 static int record__aio_write(struct aiocb *cblock, int trace_fd, 183 void *buf, size_t size, off_t off) 184 { 185 int rc; 186 187 cblock->aio_fildes = trace_fd; 188 cblock->aio_buf = buf; 189 cblock->aio_nbytes = size; 190 cblock->aio_offset = off; 191 cblock->aio_sigevent.sigev_notify = SIGEV_NONE; 192 193 do { 194 rc = aio_write(cblock); 195 if (rc == 0) { 196 break; 197 } else if (errno != EAGAIN) { 198 cblock->aio_fildes = -1; 199 pr_err("failed to queue perf data, error: %m\n"); 200 break; 201 } 202 } while (1); 203 204 return rc; 205 } 206 207 static int record__aio_complete(struct mmap *md, struct aiocb *cblock) 208 { 209 void *rem_buf; 210 off_t rem_off; 211 size_t rem_size; 212 int rc, aio_errno; 213 ssize_t aio_ret, written; 214 215 aio_errno = aio_error(cblock); 216 if (aio_errno == EINPROGRESS) 217 return 0; 218 219 written = aio_ret = aio_return(cblock); 220 if (aio_ret < 0) { 221 if (aio_errno != EINTR) 222 pr_err("failed to write perf data, error: %m\n"); 223 written = 0; 224 } 225 226 rem_size = cblock->aio_nbytes - written; 227 228 if (rem_size == 0) { 229 cblock->aio_fildes = -1; 230 /* 231 * md->refcount is incremented in record__aio_pushfn() for 232 * every aio write request started in record__aio_push() so 233 * decrement it because the request is now complete. 234 */ 235 perf_mmap__put(&md->core); 236 rc = 1; 237 } else { 238 /* 239 * aio write request may require restart with the 240 * reminder if the kernel didn't write whole 241 * chunk at once. 242 */ 243 rem_off = cblock->aio_offset + written; 244 rem_buf = (void *)(cblock->aio_buf + written); 245 record__aio_write(cblock, cblock->aio_fildes, 246 rem_buf, rem_size, rem_off); 247 rc = 0; 248 } 249 250 return rc; 251 } 252 253 static int record__aio_sync(struct mmap *md, bool sync_all) 254 { 255 struct aiocb **aiocb = md->aio.aiocb; 256 struct aiocb *cblocks = md->aio.cblocks; 257 struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */ 258 int i, do_suspend; 259 260 do { 261 do_suspend = 0; 262 for (i = 0; i < md->aio.nr_cblocks; ++i) { 263 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) { 264 if (sync_all) 265 aiocb[i] = NULL; 266 else 267 return i; 268 } else { 269 /* 270 * Started aio write is not complete yet 271 * so it has to be waited before the 272 * next allocation. 273 */ 274 aiocb[i] = &cblocks[i]; 275 do_suspend = 1; 276 } 277 } 278 if (!do_suspend) 279 return -1; 280 281 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) { 282 if (!(errno == EAGAIN || errno == EINTR)) 283 pr_err("failed to sync perf data, error: %m\n"); 284 } 285 } while (1); 286 } 287 288 struct record_aio { 289 struct record *rec; 290 void *data; 291 size_t size; 292 }; 293 294 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size) 295 { 296 struct record_aio *aio = to; 297 298 /* 299 * map->core.base data pointed by buf is copied into free map->aio.data[] buffer 300 * to release space in the kernel buffer as fast as possible, calling 301 * perf_mmap__consume() from perf_mmap__push() function. 302 * 303 * That lets the kernel to proceed with storing more profiling data into 304 * the kernel buffer earlier than other per-cpu kernel buffers are handled. 305 * 306 * Coping can be done in two steps in case the chunk of profiling data 307 * crosses the upper bound of the kernel buffer. In this case we first move 308 * part of data from map->start till the upper bound and then the reminder 309 * from the beginning of the kernel buffer till the end of the data chunk. 310 */ 311 312 if (record__comp_enabled(aio->rec)) { 313 size = zstd_compress(aio->rec->session, aio->data + aio->size, 314 mmap__mmap_len(map) - aio->size, 315 buf, size); 316 } else { 317 memcpy(aio->data + aio->size, buf, size); 318 } 319 320 if (!aio->size) { 321 /* 322 * Increment map->refcount to guard map->aio.data[] buffer 323 * from premature deallocation because map object can be 324 * released earlier than aio write request started on 325 * map->aio.data[] buffer is complete. 326 * 327 * perf_mmap__put() is done at record__aio_complete() 328 * after started aio request completion or at record__aio_push() 329 * if the request failed to start. 330 */ 331 perf_mmap__get(&map->core); 332 } 333 334 aio->size += size; 335 336 return size; 337 } 338 339 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off) 340 { 341 int ret, idx; 342 int trace_fd = rec->session->data->file.fd; 343 struct record_aio aio = { .rec = rec, .size = 0 }; 344 345 /* 346 * Call record__aio_sync() to wait till map->aio.data[] buffer 347 * becomes available after previous aio write operation. 348 */ 349 350 idx = record__aio_sync(map, false); 351 aio.data = map->aio.data[idx]; 352 ret = perf_mmap__push(map, &aio, record__aio_pushfn); 353 if (ret != 0) /* ret > 0 - no data, ret < 0 - error */ 354 return ret; 355 356 rec->samples++; 357 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off); 358 if (!ret) { 359 *off += aio.size; 360 rec->bytes_written += aio.size; 361 if (switch_output_size(rec)) 362 trigger_hit(&switch_output_trigger); 363 } else { 364 /* 365 * Decrement map->refcount incremented in record__aio_pushfn() 366 * back if record__aio_write() operation failed to start, otherwise 367 * map->refcount is decremented in record__aio_complete() after 368 * aio write operation finishes successfully. 369 */ 370 perf_mmap__put(&map->core); 371 } 372 373 return ret; 374 } 375 376 static off_t record__aio_get_pos(int trace_fd) 377 { 378 return lseek(trace_fd, 0, SEEK_CUR); 379 } 380 381 static void record__aio_set_pos(int trace_fd, off_t pos) 382 { 383 lseek(trace_fd, pos, SEEK_SET); 384 } 385 386 static void record__aio_mmap_read_sync(struct record *rec) 387 { 388 int i; 389 struct evlist *evlist = rec->evlist; 390 struct mmap *maps = evlist->mmap; 391 392 if (!record__aio_enabled(rec)) 393 return; 394 395 for (i = 0; i < evlist->core.nr_mmaps; i++) { 396 struct mmap *map = &maps[i]; 397 398 if (map->core.base) 399 record__aio_sync(map, true); 400 } 401 } 402 403 static int nr_cblocks_default = 1; 404 static int nr_cblocks_max = 4; 405 406 static int record__aio_parse(const struct option *opt, 407 const char *str, 408 int unset) 409 { 410 struct record_opts *opts = (struct record_opts *)opt->value; 411 412 if (unset) { 413 opts->nr_cblocks = 0; 414 } else { 415 if (str) 416 opts->nr_cblocks = strtol(str, NULL, 0); 417 if (!opts->nr_cblocks) 418 opts->nr_cblocks = nr_cblocks_default; 419 } 420 421 return 0; 422 } 423 #else /* HAVE_AIO_SUPPORT */ 424 static int nr_cblocks_max = 0; 425 426 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused, 427 off_t *off __maybe_unused) 428 { 429 return -1; 430 } 431 432 static off_t record__aio_get_pos(int trace_fd __maybe_unused) 433 { 434 return -1; 435 } 436 437 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused) 438 { 439 } 440 441 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused) 442 { 443 } 444 #endif 445 446 static int record__aio_enabled(struct record *rec) 447 { 448 return rec->opts.nr_cblocks > 0; 449 } 450 451 #define MMAP_FLUSH_DEFAULT 1 452 static int record__mmap_flush_parse(const struct option *opt, 453 const char *str, 454 int unset) 455 { 456 int flush_max; 457 struct record_opts *opts = (struct record_opts *)opt->value; 458 static struct parse_tag tags[] = { 459 { .tag = 'B', .mult = 1 }, 460 { .tag = 'K', .mult = 1 << 10 }, 461 { .tag = 'M', .mult = 1 << 20 }, 462 { .tag = 'G', .mult = 1 << 30 }, 463 { .tag = 0 }, 464 }; 465 466 if (unset) 467 return 0; 468 469 if (str) { 470 opts->mmap_flush = parse_tag_value(str, tags); 471 if (opts->mmap_flush == (int)-1) 472 opts->mmap_flush = strtol(str, NULL, 0); 473 } 474 475 if (!opts->mmap_flush) 476 opts->mmap_flush = MMAP_FLUSH_DEFAULT; 477 478 flush_max = evlist__mmap_size(opts->mmap_pages); 479 flush_max /= 4; 480 if (opts->mmap_flush > flush_max) 481 opts->mmap_flush = flush_max; 482 483 return 0; 484 } 485 486 #ifdef HAVE_ZSTD_SUPPORT 487 static unsigned int comp_level_default = 1; 488 489 static int record__parse_comp_level(const struct option *opt, const char *str, int unset) 490 { 491 struct record_opts *opts = opt->value; 492 493 if (unset) { 494 opts->comp_level = 0; 495 } else { 496 if (str) 497 opts->comp_level = strtol(str, NULL, 0); 498 if (!opts->comp_level) 499 opts->comp_level = comp_level_default; 500 } 501 502 return 0; 503 } 504 #endif 505 static unsigned int comp_level_max = 22; 506 507 static int record__comp_enabled(struct record *rec) 508 { 509 return rec->opts.comp_level > 0; 510 } 511 512 static int process_synthesized_event(struct perf_tool *tool, 513 union perf_event *event, 514 struct perf_sample *sample __maybe_unused, 515 struct machine *machine __maybe_unused) 516 { 517 struct record *rec = container_of(tool, struct record, tool); 518 return record__write(rec, NULL, event, event->header.size); 519 } 520 521 static int process_locked_synthesized_event(struct perf_tool *tool, 522 union perf_event *event, 523 struct perf_sample *sample __maybe_unused, 524 struct machine *machine __maybe_unused) 525 { 526 static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER; 527 int ret; 528 529 pthread_mutex_lock(&synth_lock); 530 ret = process_synthesized_event(tool, event, sample, machine); 531 pthread_mutex_unlock(&synth_lock); 532 return ret; 533 } 534 535 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size) 536 { 537 struct record *rec = to; 538 539 if (record__comp_enabled(rec)) { 540 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size); 541 bf = map->data; 542 } 543 544 rec->samples++; 545 return record__write(rec, map, bf, size); 546 } 547 548 static volatile int signr = -1; 549 static volatile int child_finished; 550 #ifdef HAVE_EVENTFD_SUPPORT 551 static int done_fd = -1; 552 #endif 553 554 static void sig_handler(int sig) 555 { 556 if (sig == SIGCHLD) 557 child_finished = 1; 558 else 559 signr = sig; 560 561 done = 1; 562 #ifdef HAVE_EVENTFD_SUPPORT 563 { 564 u64 tmp = 1; 565 /* 566 * It is possible for this signal handler to run after done is checked 567 * in the main loop, but before the perf counter fds are polled. If this 568 * happens, the poll() will continue to wait even though done is set, 569 * and will only break out if either another signal is received, or the 570 * counters are ready for read. To ensure the poll() doesn't sleep when 571 * done is set, use an eventfd (done_fd) to wake up the poll(). 572 */ 573 if (write(done_fd, &tmp, sizeof(tmp)) < 0) 574 pr_err("failed to signal wakeup fd, error: %m\n"); 575 } 576 #endif // HAVE_EVENTFD_SUPPORT 577 } 578 579 static void sigsegv_handler(int sig) 580 { 581 perf_hooks__recover(); 582 sighandler_dump_stack(sig); 583 } 584 585 static void record__sig_exit(void) 586 { 587 if (signr == -1) 588 return; 589 590 signal(signr, SIG_DFL); 591 raise(signr); 592 } 593 594 #ifdef HAVE_AUXTRACE_SUPPORT 595 596 static int record__process_auxtrace(struct perf_tool *tool, 597 struct mmap *map, 598 union perf_event *event, void *data1, 599 size_t len1, void *data2, size_t len2) 600 { 601 struct record *rec = container_of(tool, struct record, tool); 602 struct perf_data *data = &rec->data; 603 size_t padding; 604 u8 pad[8] = {0}; 605 606 if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) { 607 off_t file_offset; 608 int fd = perf_data__fd(data); 609 int err; 610 611 file_offset = lseek(fd, 0, SEEK_CUR); 612 if (file_offset == -1) 613 return -1; 614 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index, 615 event, file_offset); 616 if (err) 617 return err; 618 } 619 620 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */ 621 padding = (len1 + len2) & 7; 622 if (padding) 623 padding = 8 - padding; 624 625 record__write(rec, map, event, event->header.size); 626 record__write(rec, map, data1, len1); 627 if (len2) 628 record__write(rec, map, data2, len2); 629 record__write(rec, map, &pad, padding); 630 631 return 0; 632 } 633 634 static int record__auxtrace_mmap_read(struct record *rec, 635 struct mmap *map) 636 { 637 int ret; 638 639 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool, 640 record__process_auxtrace); 641 if (ret < 0) 642 return ret; 643 644 if (ret) 645 rec->samples++; 646 647 return 0; 648 } 649 650 static int record__auxtrace_mmap_read_snapshot(struct record *rec, 651 struct mmap *map) 652 { 653 int ret; 654 655 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool, 656 record__process_auxtrace, 657 rec->opts.auxtrace_snapshot_size); 658 if (ret < 0) 659 return ret; 660 661 if (ret) 662 rec->samples++; 663 664 return 0; 665 } 666 667 static int record__auxtrace_read_snapshot_all(struct record *rec) 668 { 669 int i; 670 int rc = 0; 671 672 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) { 673 struct mmap *map = &rec->evlist->mmap[i]; 674 675 if (!map->auxtrace_mmap.base) 676 continue; 677 678 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) { 679 rc = -1; 680 goto out; 681 } 682 } 683 out: 684 return rc; 685 } 686 687 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit) 688 { 689 pr_debug("Recording AUX area tracing snapshot\n"); 690 if (record__auxtrace_read_snapshot_all(rec) < 0) { 691 trigger_error(&auxtrace_snapshot_trigger); 692 } else { 693 if (auxtrace_record__snapshot_finish(rec->itr, on_exit)) 694 trigger_error(&auxtrace_snapshot_trigger); 695 else 696 trigger_ready(&auxtrace_snapshot_trigger); 697 } 698 } 699 700 static int record__auxtrace_snapshot_exit(struct record *rec) 701 { 702 if (trigger_is_error(&auxtrace_snapshot_trigger)) 703 return 0; 704 705 if (!auxtrace_record__snapshot_started && 706 auxtrace_record__snapshot_start(rec->itr)) 707 return -1; 708 709 record__read_auxtrace_snapshot(rec, true); 710 if (trigger_is_error(&auxtrace_snapshot_trigger)) 711 return -1; 712 713 return 0; 714 } 715 716 static int record__auxtrace_init(struct record *rec) 717 { 718 int err; 719 720 if (!rec->itr) { 721 rec->itr = auxtrace_record__init(rec->evlist, &err); 722 if (err) 723 return err; 724 } 725 726 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts, 727 rec->opts.auxtrace_snapshot_opts); 728 if (err) 729 return err; 730 731 err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts, 732 rec->opts.auxtrace_sample_opts); 733 if (err) 734 return err; 735 736 auxtrace_regroup_aux_output(rec->evlist); 737 738 return auxtrace_parse_filters(rec->evlist); 739 } 740 741 #else 742 743 static inline 744 int record__auxtrace_mmap_read(struct record *rec __maybe_unused, 745 struct mmap *map __maybe_unused) 746 { 747 return 0; 748 } 749 750 static inline 751 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused, 752 bool on_exit __maybe_unused) 753 { 754 } 755 756 static inline 757 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused) 758 { 759 return 0; 760 } 761 762 static inline 763 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused) 764 { 765 return 0; 766 } 767 768 static int record__auxtrace_init(struct record *rec __maybe_unused) 769 { 770 return 0; 771 } 772 773 #endif 774 775 static int record__config_text_poke(struct evlist *evlist) 776 { 777 struct evsel *evsel; 778 int err; 779 780 /* Nothing to do if text poke is already configured */ 781 evlist__for_each_entry(evlist, evsel) { 782 if (evsel->core.attr.text_poke) 783 return 0; 784 } 785 786 err = parse_events(evlist, "dummy:u", NULL); 787 if (err) 788 return err; 789 790 evsel = evlist__last(evlist); 791 792 evsel->core.attr.freq = 0; 793 evsel->core.attr.sample_period = 1; 794 evsel->core.attr.text_poke = 1; 795 evsel->core.attr.ksymbol = 1; 796 797 evsel->core.system_wide = true; 798 evsel->no_aux_samples = true; 799 evsel->immediate = true; 800 801 /* Text poke must be collected on all CPUs */ 802 perf_cpu_map__put(evsel->core.own_cpus); 803 evsel->core.own_cpus = perf_cpu_map__new(NULL); 804 perf_cpu_map__put(evsel->core.cpus); 805 evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus); 806 807 evsel__set_sample_bit(evsel, TIME); 808 809 return 0; 810 } 811 812 static bool record__kcore_readable(struct machine *machine) 813 { 814 char kcore[PATH_MAX]; 815 int fd; 816 817 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir); 818 819 fd = open(kcore, O_RDONLY); 820 if (fd < 0) 821 return false; 822 823 close(fd); 824 825 return true; 826 } 827 828 static int record__kcore_copy(struct machine *machine, struct perf_data *data) 829 { 830 char from_dir[PATH_MAX]; 831 char kcore_dir[PATH_MAX]; 832 int ret; 833 834 snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir); 835 836 ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir)); 837 if (ret) 838 return ret; 839 840 return kcore_copy(from_dir, kcore_dir); 841 } 842 843 static int record__mmap_evlist(struct record *rec, 844 struct evlist *evlist) 845 { 846 struct record_opts *opts = &rec->opts; 847 bool auxtrace_overwrite = opts->auxtrace_snapshot_mode || 848 opts->auxtrace_sample_mode; 849 char msg[512]; 850 851 if (opts->affinity != PERF_AFFINITY_SYS) 852 cpu__setup_cpunode_map(); 853 854 if (evlist__mmap_ex(evlist, opts->mmap_pages, 855 opts->auxtrace_mmap_pages, 856 auxtrace_overwrite, 857 opts->nr_cblocks, opts->affinity, 858 opts->mmap_flush, opts->comp_level) < 0) { 859 if (errno == EPERM) { 860 pr_err("Permission error mapping pages.\n" 861 "Consider increasing " 862 "/proc/sys/kernel/perf_event_mlock_kb,\n" 863 "or try again with a smaller value of -m/--mmap_pages.\n" 864 "(current value: %u,%u)\n", 865 opts->mmap_pages, opts->auxtrace_mmap_pages); 866 return -errno; 867 } else { 868 pr_err("failed to mmap with %d (%s)\n", errno, 869 str_error_r(errno, msg, sizeof(msg))); 870 if (errno) 871 return -errno; 872 else 873 return -EINVAL; 874 } 875 } 876 return 0; 877 } 878 879 static int record__mmap(struct record *rec) 880 { 881 return record__mmap_evlist(rec, rec->evlist); 882 } 883 884 static int record__open(struct record *rec) 885 { 886 char msg[BUFSIZ]; 887 struct evsel *pos; 888 struct evlist *evlist = rec->evlist; 889 struct perf_session *session = rec->session; 890 struct record_opts *opts = &rec->opts; 891 int rc = 0; 892 893 /* 894 * For initial_delay, system wide or a hybrid system, we need to add a 895 * dummy event so that we can track PERF_RECORD_MMAP to cover the delay 896 * of waiting or event synthesis. 897 */ 898 if (opts->initial_delay || target__has_cpu(&opts->target) || 899 perf_pmu__has_hybrid()) { 900 pos = evlist__get_tracking_event(evlist); 901 if (!evsel__is_dummy_event(pos)) { 902 /* Set up dummy event. */ 903 if (evlist__add_dummy(evlist)) 904 return -ENOMEM; 905 pos = evlist__last(evlist); 906 evlist__set_tracking_event(evlist, pos); 907 } 908 909 /* 910 * Enable the dummy event when the process is forked for 911 * initial_delay, immediately for system wide. 912 */ 913 if (opts->initial_delay && !pos->immediate) 914 pos->core.attr.enable_on_exec = 1; 915 else 916 pos->immediate = 1; 917 } 918 919 evlist__config(evlist, opts, &callchain_param); 920 921 evlist__for_each_entry(evlist, pos) { 922 try_again: 923 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) { 924 if (evsel__fallback(pos, errno, msg, sizeof(msg))) { 925 if (verbose > 0) 926 ui__warning("%s\n", msg); 927 goto try_again; 928 } 929 if ((errno == EINVAL || errno == EBADF) && 930 pos->core.leader != &pos->core && 931 pos->weak_group) { 932 pos = evlist__reset_weak_group(evlist, pos, true); 933 goto try_again; 934 } 935 rc = -errno; 936 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg)); 937 ui__error("%s\n", msg); 938 goto out; 939 } 940 941 pos->supported = true; 942 } 943 944 if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) { 945 pr_warning( 946 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" 947 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" 948 "Samples in kernel functions may not be resolved if a suitable vmlinux\n" 949 "file is not found in the buildid cache or in the vmlinux path.\n\n" 950 "Samples in kernel modules won't be resolved at all.\n\n" 951 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n" 952 "even with a suitable vmlinux or kallsyms file.\n\n"); 953 } 954 955 if (evlist__apply_filters(evlist, &pos)) { 956 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n", 957 pos->filter, evsel__name(pos), errno, 958 str_error_r(errno, msg, sizeof(msg))); 959 rc = -1; 960 goto out; 961 } 962 963 rc = record__mmap(rec); 964 if (rc) 965 goto out; 966 967 session->evlist = evlist; 968 perf_session__set_id_hdr_size(session); 969 out: 970 return rc; 971 } 972 973 static void set_timestamp_boundary(struct record *rec, u64 sample_time) 974 { 975 if (rec->evlist->first_sample_time == 0) 976 rec->evlist->first_sample_time = sample_time; 977 978 if (sample_time) 979 rec->evlist->last_sample_time = sample_time; 980 } 981 982 static int process_sample_event(struct perf_tool *tool, 983 union perf_event *event, 984 struct perf_sample *sample, 985 struct evsel *evsel, 986 struct machine *machine) 987 { 988 struct record *rec = container_of(tool, struct record, tool); 989 990 set_timestamp_boundary(rec, sample->time); 991 992 if (rec->buildid_all) 993 return 0; 994 995 rec->samples++; 996 return build_id__mark_dso_hit(tool, event, sample, evsel, machine); 997 } 998 999 static int process_buildids(struct record *rec) 1000 { 1001 struct perf_session *session = rec->session; 1002 1003 if (perf_data__size(&rec->data) == 0) 1004 return 0; 1005 1006 /* 1007 * During this process, it'll load kernel map and replace the 1008 * dso->long_name to a real pathname it found. In this case 1009 * we prefer the vmlinux path like 1010 * /lib/modules/3.16.4/build/vmlinux 1011 * 1012 * rather than build-id path (in debug directory). 1013 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 1014 */ 1015 symbol_conf.ignore_vmlinux_buildid = true; 1016 1017 /* 1018 * If --buildid-all is given, it marks all DSO regardless of hits, 1019 * so no need to process samples. But if timestamp_boundary is enabled, 1020 * it still needs to walk on all samples to get the timestamps of 1021 * first/last samples. 1022 */ 1023 if (rec->buildid_all && !rec->timestamp_boundary) 1024 rec->tool.sample = NULL; 1025 1026 return perf_session__process_events(session); 1027 } 1028 1029 static void perf_event__synthesize_guest_os(struct machine *machine, void *data) 1030 { 1031 int err; 1032 struct perf_tool *tool = data; 1033 /* 1034 *As for guest kernel when processing subcommand record&report, 1035 *we arrange module mmap prior to guest kernel mmap and trigger 1036 *a preload dso because default guest module symbols are loaded 1037 *from guest kallsyms instead of /lib/modules/XXX/XXX. This 1038 *method is used to avoid symbol missing when the first addr is 1039 *in module instead of in guest kernel. 1040 */ 1041 err = perf_event__synthesize_modules(tool, process_synthesized_event, 1042 machine); 1043 if (err < 0) 1044 pr_err("Couldn't record guest kernel [%d]'s reference" 1045 " relocation symbol.\n", machine->pid); 1046 1047 /* 1048 * We use _stext for guest kernel because guest kernel's /proc/kallsyms 1049 * have no _text sometimes. 1050 */ 1051 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, 1052 machine); 1053 if (err < 0) 1054 pr_err("Couldn't record guest kernel [%d]'s reference" 1055 " relocation symbol.\n", machine->pid); 1056 } 1057 1058 static struct perf_event_header finished_round_event = { 1059 .size = sizeof(struct perf_event_header), 1060 .type = PERF_RECORD_FINISHED_ROUND, 1061 }; 1062 1063 static void record__adjust_affinity(struct record *rec, struct mmap *map) 1064 { 1065 if (rec->opts.affinity != PERF_AFFINITY_SYS && 1066 !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits, 1067 rec->affinity_mask.nbits)) { 1068 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits); 1069 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits, 1070 map->affinity_mask.bits, rec->affinity_mask.nbits); 1071 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask), 1072 (cpu_set_t *)rec->affinity_mask.bits); 1073 if (verbose == 2) 1074 mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread"); 1075 } 1076 } 1077 1078 static size_t process_comp_header(void *record, size_t increment) 1079 { 1080 struct perf_record_compressed *event = record; 1081 size_t size = sizeof(*event); 1082 1083 if (increment) { 1084 event->header.size += increment; 1085 return increment; 1086 } 1087 1088 event->header.type = PERF_RECORD_COMPRESSED; 1089 event->header.size = size; 1090 1091 return size; 1092 } 1093 1094 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size, 1095 void *src, size_t src_size) 1096 { 1097 size_t compressed; 1098 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1; 1099 1100 compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size, 1101 max_record_size, process_comp_header); 1102 1103 session->bytes_transferred += src_size; 1104 session->bytes_compressed += compressed; 1105 1106 return compressed; 1107 } 1108 1109 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist, 1110 bool overwrite, bool synch) 1111 { 1112 u64 bytes_written = rec->bytes_written; 1113 int i; 1114 int rc = 0; 1115 struct mmap *maps; 1116 int trace_fd = rec->data.file.fd; 1117 off_t off = 0; 1118 1119 if (!evlist) 1120 return 0; 1121 1122 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap; 1123 if (!maps) 1124 return 0; 1125 1126 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING) 1127 return 0; 1128 1129 if (record__aio_enabled(rec)) 1130 off = record__aio_get_pos(trace_fd); 1131 1132 for (i = 0; i < evlist->core.nr_mmaps; i++) { 1133 u64 flush = 0; 1134 struct mmap *map = &maps[i]; 1135 1136 if (map->core.base) { 1137 record__adjust_affinity(rec, map); 1138 if (synch) { 1139 flush = map->core.flush; 1140 map->core.flush = 1; 1141 } 1142 if (!record__aio_enabled(rec)) { 1143 if (perf_mmap__push(map, rec, record__pushfn) < 0) { 1144 if (synch) 1145 map->core.flush = flush; 1146 rc = -1; 1147 goto out; 1148 } 1149 } else { 1150 if (record__aio_push(rec, map, &off) < 0) { 1151 record__aio_set_pos(trace_fd, off); 1152 if (synch) 1153 map->core.flush = flush; 1154 rc = -1; 1155 goto out; 1156 } 1157 } 1158 if (synch) 1159 map->core.flush = flush; 1160 } 1161 1162 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode && 1163 !rec->opts.auxtrace_sample_mode && 1164 record__auxtrace_mmap_read(rec, map) != 0) { 1165 rc = -1; 1166 goto out; 1167 } 1168 } 1169 1170 if (record__aio_enabled(rec)) 1171 record__aio_set_pos(trace_fd, off); 1172 1173 /* 1174 * Mark the round finished in case we wrote 1175 * at least one event. 1176 */ 1177 if (bytes_written != rec->bytes_written) 1178 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event)); 1179 1180 if (overwrite) 1181 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY); 1182 out: 1183 return rc; 1184 } 1185 1186 static int record__mmap_read_all(struct record *rec, bool synch) 1187 { 1188 int err; 1189 1190 err = record__mmap_read_evlist(rec, rec->evlist, false, synch); 1191 if (err) 1192 return err; 1193 1194 return record__mmap_read_evlist(rec, rec->evlist, true, synch); 1195 } 1196 1197 static void record__init_features(struct record *rec) 1198 { 1199 struct perf_session *session = rec->session; 1200 int feat; 1201 1202 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++) 1203 perf_header__set_feat(&session->header, feat); 1204 1205 if (rec->no_buildid) 1206 perf_header__clear_feat(&session->header, HEADER_BUILD_ID); 1207 1208 if (!have_tracepoints(&rec->evlist->core.entries)) 1209 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA); 1210 1211 if (!rec->opts.branch_stack) 1212 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK); 1213 1214 if (!rec->opts.full_auxtrace) 1215 perf_header__clear_feat(&session->header, HEADER_AUXTRACE); 1216 1217 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns)) 1218 perf_header__clear_feat(&session->header, HEADER_CLOCKID); 1219 1220 if (!rec->opts.use_clockid) 1221 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA); 1222 1223 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT); 1224 if (!record__comp_enabled(rec)) 1225 perf_header__clear_feat(&session->header, HEADER_COMPRESSED); 1226 1227 perf_header__clear_feat(&session->header, HEADER_STAT); 1228 } 1229 1230 static void 1231 record__finish_output(struct record *rec) 1232 { 1233 struct perf_data *data = &rec->data; 1234 int fd = perf_data__fd(data); 1235 1236 if (data->is_pipe) 1237 return; 1238 1239 rec->session->header.data_size += rec->bytes_written; 1240 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR); 1241 1242 if (!rec->no_buildid) { 1243 process_buildids(rec); 1244 1245 if (rec->buildid_all) 1246 dsos__hit_all(rec->session); 1247 } 1248 perf_session__write_header(rec->session, rec->evlist, fd, true); 1249 1250 return; 1251 } 1252 1253 static int record__synthesize_workload(struct record *rec, bool tail) 1254 { 1255 int err; 1256 struct perf_thread_map *thread_map; 1257 1258 if (rec->opts.tail_synthesize != tail) 1259 return 0; 1260 1261 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid); 1262 if (thread_map == NULL) 1263 return -1; 1264 1265 err = perf_event__synthesize_thread_map(&rec->tool, thread_map, 1266 process_synthesized_event, 1267 &rec->session->machines.host, 1268 rec->opts.sample_address); 1269 perf_thread_map__put(thread_map); 1270 return err; 1271 } 1272 1273 static int record__synthesize(struct record *rec, bool tail); 1274 1275 static int 1276 record__switch_output(struct record *rec, bool at_exit) 1277 { 1278 struct perf_data *data = &rec->data; 1279 int fd, err; 1280 char *new_filename; 1281 1282 /* Same Size: "2015122520103046"*/ 1283 char timestamp[] = "InvalidTimestamp"; 1284 1285 record__aio_mmap_read_sync(rec); 1286 1287 record__synthesize(rec, true); 1288 if (target__none(&rec->opts.target)) 1289 record__synthesize_workload(rec, true); 1290 1291 rec->samples = 0; 1292 record__finish_output(rec); 1293 err = fetch_current_timestamp(timestamp, sizeof(timestamp)); 1294 if (err) { 1295 pr_err("Failed to get current timestamp\n"); 1296 return -EINVAL; 1297 } 1298 1299 fd = perf_data__switch(data, timestamp, 1300 rec->session->header.data_offset, 1301 at_exit, &new_filename); 1302 if (fd >= 0 && !at_exit) { 1303 rec->bytes_written = 0; 1304 rec->session->header.data_size = 0; 1305 } 1306 1307 if (!quiet) 1308 fprintf(stderr, "[ perf record: Dump %s.%s ]\n", 1309 data->path, timestamp); 1310 1311 if (rec->switch_output.num_files) { 1312 int n = rec->switch_output.cur_file + 1; 1313 1314 if (n >= rec->switch_output.num_files) 1315 n = 0; 1316 rec->switch_output.cur_file = n; 1317 if (rec->switch_output.filenames[n]) { 1318 remove(rec->switch_output.filenames[n]); 1319 zfree(&rec->switch_output.filenames[n]); 1320 } 1321 rec->switch_output.filenames[n] = new_filename; 1322 } else { 1323 free(new_filename); 1324 } 1325 1326 /* Output tracking events */ 1327 if (!at_exit) { 1328 record__synthesize(rec, false); 1329 1330 /* 1331 * In 'perf record --switch-output' without -a, 1332 * record__synthesize() in record__switch_output() won't 1333 * generate tracking events because there's no thread_map 1334 * in evlist. Which causes newly created perf.data doesn't 1335 * contain map and comm information. 1336 * Create a fake thread_map and directly call 1337 * perf_event__synthesize_thread_map() for those events. 1338 */ 1339 if (target__none(&rec->opts.target)) 1340 record__synthesize_workload(rec, false); 1341 } 1342 return fd; 1343 } 1344 1345 static volatile int workload_exec_errno; 1346 1347 /* 1348 * evlist__prepare_workload will send a SIGUSR1 1349 * if the fork fails, since we asked by setting its 1350 * want_signal to true. 1351 */ 1352 static void workload_exec_failed_signal(int signo __maybe_unused, 1353 siginfo_t *info, 1354 void *ucontext __maybe_unused) 1355 { 1356 workload_exec_errno = info->si_value.sival_int; 1357 done = 1; 1358 child_finished = 1; 1359 } 1360 1361 static void snapshot_sig_handler(int sig); 1362 static void alarm_sig_handler(int sig); 1363 1364 static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist) 1365 { 1366 if (evlist) { 1367 if (evlist->mmap && evlist->mmap[0].core.base) 1368 return evlist->mmap[0].core.base; 1369 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base) 1370 return evlist->overwrite_mmap[0].core.base; 1371 } 1372 return NULL; 1373 } 1374 1375 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec) 1376 { 1377 const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist); 1378 if (pc) 1379 return pc; 1380 return NULL; 1381 } 1382 1383 static int record__synthesize(struct record *rec, bool tail) 1384 { 1385 struct perf_session *session = rec->session; 1386 struct machine *machine = &session->machines.host; 1387 struct perf_data *data = &rec->data; 1388 struct record_opts *opts = &rec->opts; 1389 struct perf_tool *tool = &rec->tool; 1390 int fd = perf_data__fd(data); 1391 int err = 0; 1392 event_op f = process_synthesized_event; 1393 1394 if (rec->opts.tail_synthesize != tail) 1395 return 0; 1396 1397 if (data->is_pipe) { 1398 /* 1399 * We need to synthesize events first, because some 1400 * features works on top of them (on report side). 1401 */ 1402 err = perf_event__synthesize_attrs(tool, rec->evlist, 1403 process_synthesized_event); 1404 if (err < 0) { 1405 pr_err("Couldn't synthesize attrs.\n"); 1406 goto out; 1407 } 1408 1409 err = perf_event__synthesize_features(tool, session, rec->evlist, 1410 process_synthesized_event); 1411 if (err < 0) { 1412 pr_err("Couldn't synthesize features.\n"); 1413 return err; 1414 } 1415 1416 if (have_tracepoints(&rec->evlist->core.entries)) { 1417 /* 1418 * FIXME err <= 0 here actually means that 1419 * there were no tracepoints so its not really 1420 * an error, just that we don't need to 1421 * synthesize anything. We really have to 1422 * return this more properly and also 1423 * propagate errors that now are calling die() 1424 */ 1425 err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist, 1426 process_synthesized_event); 1427 if (err <= 0) { 1428 pr_err("Couldn't record tracing data.\n"); 1429 goto out; 1430 } 1431 rec->bytes_written += err; 1432 } 1433 } 1434 1435 err = perf_event__synth_time_conv(record__pick_pc(rec), tool, 1436 process_synthesized_event, machine); 1437 if (err) 1438 goto out; 1439 1440 /* Synthesize id_index before auxtrace_info */ 1441 if (rec->opts.auxtrace_sample_mode) { 1442 err = perf_event__synthesize_id_index(tool, 1443 process_synthesized_event, 1444 session->evlist, machine); 1445 if (err) 1446 goto out; 1447 } 1448 1449 if (rec->opts.full_auxtrace) { 1450 err = perf_event__synthesize_auxtrace_info(rec->itr, tool, 1451 session, process_synthesized_event); 1452 if (err) 1453 goto out; 1454 } 1455 1456 if (!evlist__exclude_kernel(rec->evlist)) { 1457 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, 1458 machine); 1459 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n" 1460 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 1461 "Check /proc/kallsyms permission or run as root.\n"); 1462 1463 err = perf_event__synthesize_modules(tool, process_synthesized_event, 1464 machine); 1465 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n" 1466 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 1467 "Check /proc/modules permission or run as root.\n"); 1468 } 1469 1470 if (perf_guest) { 1471 machines__process_guests(&session->machines, 1472 perf_event__synthesize_guest_os, tool); 1473 } 1474 1475 err = perf_event__synthesize_extra_attr(&rec->tool, 1476 rec->evlist, 1477 process_synthesized_event, 1478 data->is_pipe); 1479 if (err) 1480 goto out; 1481 1482 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads, 1483 process_synthesized_event, 1484 NULL); 1485 if (err < 0) { 1486 pr_err("Couldn't synthesize thread map.\n"); 1487 return err; 1488 } 1489 1490 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus, 1491 process_synthesized_event, NULL); 1492 if (err < 0) { 1493 pr_err("Couldn't synthesize cpu map.\n"); 1494 return err; 1495 } 1496 1497 err = perf_event__synthesize_bpf_events(session, process_synthesized_event, 1498 machine, opts); 1499 if (err < 0) 1500 pr_warning("Couldn't synthesize bpf events.\n"); 1501 1502 err = perf_event__synthesize_cgroups(tool, process_synthesized_event, 1503 machine); 1504 if (err < 0) 1505 pr_warning("Couldn't synthesize cgroup events.\n"); 1506 1507 if (rec->opts.nr_threads_synthesize > 1) { 1508 perf_set_multithreaded(); 1509 f = process_locked_synthesized_event; 1510 } 1511 1512 err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads, 1513 f, opts->sample_address, 1514 rec->opts.nr_threads_synthesize); 1515 1516 if (rec->opts.nr_threads_synthesize > 1) 1517 perf_set_singlethreaded(); 1518 1519 out: 1520 return err; 1521 } 1522 1523 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data) 1524 { 1525 struct record *rec = data; 1526 pthread_kill(rec->thread_id, SIGUSR2); 1527 return 0; 1528 } 1529 1530 static int record__setup_sb_evlist(struct record *rec) 1531 { 1532 struct record_opts *opts = &rec->opts; 1533 1534 if (rec->sb_evlist != NULL) { 1535 /* 1536 * We get here if --switch-output-event populated the 1537 * sb_evlist, so associate a callback that will send a SIGUSR2 1538 * to the main thread. 1539 */ 1540 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec); 1541 rec->thread_id = pthread_self(); 1542 } 1543 #ifdef HAVE_LIBBPF_SUPPORT 1544 if (!opts->no_bpf_event) { 1545 if (rec->sb_evlist == NULL) { 1546 rec->sb_evlist = evlist__new(); 1547 1548 if (rec->sb_evlist == NULL) { 1549 pr_err("Couldn't create side band evlist.\n."); 1550 return -1; 1551 } 1552 } 1553 1554 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) { 1555 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n."); 1556 return -1; 1557 } 1558 } 1559 #endif 1560 if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) { 1561 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n"); 1562 opts->no_bpf_event = true; 1563 } 1564 1565 return 0; 1566 } 1567 1568 static int record__init_clock(struct record *rec) 1569 { 1570 struct perf_session *session = rec->session; 1571 struct timespec ref_clockid; 1572 struct timeval ref_tod; 1573 u64 ref; 1574 1575 if (!rec->opts.use_clockid) 1576 return 0; 1577 1578 if (rec->opts.use_clockid && rec->opts.clockid_res_ns) 1579 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns; 1580 1581 session->header.env.clock.clockid = rec->opts.clockid; 1582 1583 if (gettimeofday(&ref_tod, NULL) != 0) { 1584 pr_err("gettimeofday failed, cannot set reference time.\n"); 1585 return -1; 1586 } 1587 1588 if (clock_gettime(rec->opts.clockid, &ref_clockid)) { 1589 pr_err("clock_gettime failed, cannot set reference time.\n"); 1590 return -1; 1591 } 1592 1593 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC + 1594 (u64) ref_tod.tv_usec * NSEC_PER_USEC; 1595 1596 session->header.env.clock.tod_ns = ref; 1597 1598 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC + 1599 (u64) ref_clockid.tv_nsec; 1600 1601 session->header.env.clock.clockid_ns = ref; 1602 return 0; 1603 } 1604 1605 static void hit_auxtrace_snapshot_trigger(struct record *rec) 1606 { 1607 if (trigger_is_ready(&auxtrace_snapshot_trigger)) { 1608 trigger_hit(&auxtrace_snapshot_trigger); 1609 auxtrace_record__snapshot_started = 1; 1610 if (auxtrace_record__snapshot_start(rec->itr)) 1611 trigger_error(&auxtrace_snapshot_trigger); 1612 } 1613 } 1614 1615 static void record__uniquify_name(struct record *rec) 1616 { 1617 struct evsel *pos; 1618 struct evlist *evlist = rec->evlist; 1619 char *new_name; 1620 int ret; 1621 1622 if (!perf_pmu__has_hybrid()) 1623 return; 1624 1625 evlist__for_each_entry(evlist, pos) { 1626 if (!evsel__is_hybrid(pos)) 1627 continue; 1628 1629 if (strchr(pos->name, '/')) 1630 continue; 1631 1632 ret = asprintf(&new_name, "%s/%s/", 1633 pos->pmu_name, pos->name); 1634 if (ret) { 1635 free(pos->name); 1636 pos->name = new_name; 1637 } 1638 } 1639 } 1640 1641 static int __cmd_record(struct record *rec, int argc, const char **argv) 1642 { 1643 int err; 1644 int status = 0; 1645 unsigned long waking = 0; 1646 const bool forks = argc > 0; 1647 struct perf_tool *tool = &rec->tool; 1648 struct record_opts *opts = &rec->opts; 1649 struct perf_data *data = &rec->data; 1650 struct perf_session *session; 1651 bool disabled = false, draining = false; 1652 int fd; 1653 float ratio = 0; 1654 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED; 1655 1656 atexit(record__sig_exit); 1657 signal(SIGCHLD, sig_handler); 1658 signal(SIGINT, sig_handler); 1659 signal(SIGTERM, sig_handler); 1660 signal(SIGSEGV, sigsegv_handler); 1661 1662 if (rec->opts.record_namespaces) 1663 tool->namespace_events = true; 1664 1665 if (rec->opts.record_cgroup) { 1666 #ifdef HAVE_FILE_HANDLE 1667 tool->cgroup_events = true; 1668 #else 1669 pr_err("cgroup tracking is not supported\n"); 1670 return -1; 1671 #endif 1672 } 1673 1674 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) { 1675 signal(SIGUSR2, snapshot_sig_handler); 1676 if (rec->opts.auxtrace_snapshot_mode) 1677 trigger_on(&auxtrace_snapshot_trigger); 1678 if (rec->switch_output.enabled) 1679 trigger_on(&switch_output_trigger); 1680 } else { 1681 signal(SIGUSR2, SIG_IGN); 1682 } 1683 1684 session = perf_session__new(data, false, tool); 1685 if (IS_ERR(session)) { 1686 pr_err("Perf session creation failed.\n"); 1687 return PTR_ERR(session); 1688 } 1689 1690 fd = perf_data__fd(data); 1691 rec->session = session; 1692 1693 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) { 1694 pr_err("Compression initialization failed.\n"); 1695 return -1; 1696 } 1697 #ifdef HAVE_EVENTFD_SUPPORT 1698 done_fd = eventfd(0, EFD_NONBLOCK); 1699 if (done_fd < 0) { 1700 pr_err("Failed to create wakeup eventfd, error: %m\n"); 1701 status = -1; 1702 goto out_delete_session; 1703 } 1704 err = evlist__add_wakeup_eventfd(rec->evlist, done_fd); 1705 if (err < 0) { 1706 pr_err("Failed to add wakeup eventfd to poll list\n"); 1707 status = err; 1708 goto out_delete_session; 1709 } 1710 #endif // HAVE_EVENTFD_SUPPORT 1711 1712 session->header.env.comp_type = PERF_COMP_ZSTD; 1713 session->header.env.comp_level = rec->opts.comp_level; 1714 1715 if (rec->opts.kcore && 1716 !record__kcore_readable(&session->machines.host)) { 1717 pr_err("ERROR: kcore is not readable.\n"); 1718 return -1; 1719 } 1720 1721 if (record__init_clock(rec)) 1722 return -1; 1723 1724 record__init_features(rec); 1725 1726 if (forks) { 1727 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe, 1728 workload_exec_failed_signal); 1729 if (err < 0) { 1730 pr_err("Couldn't run the workload!\n"); 1731 status = err; 1732 goto out_delete_session; 1733 } 1734 } 1735 1736 /* 1737 * If we have just single event and are sending data 1738 * through pipe, we need to force the ids allocation, 1739 * because we synthesize event name through the pipe 1740 * and need the id for that. 1741 */ 1742 if (data->is_pipe && rec->evlist->core.nr_entries == 1) 1743 rec->opts.sample_id = true; 1744 1745 record__uniquify_name(rec); 1746 1747 if (record__open(rec) != 0) { 1748 err = -1; 1749 goto out_child; 1750 } 1751 session->header.env.comp_mmap_len = session->evlist->core.mmap_len; 1752 1753 if (rec->opts.kcore) { 1754 err = record__kcore_copy(&session->machines.host, data); 1755 if (err) { 1756 pr_err("ERROR: Failed to copy kcore\n"); 1757 goto out_child; 1758 } 1759 } 1760 1761 err = bpf__apply_obj_config(); 1762 if (err) { 1763 char errbuf[BUFSIZ]; 1764 1765 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf)); 1766 pr_err("ERROR: Apply config to BPF failed: %s\n", 1767 errbuf); 1768 goto out_child; 1769 } 1770 1771 /* 1772 * Normally perf_session__new would do this, but it doesn't have the 1773 * evlist. 1774 */ 1775 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) { 1776 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n"); 1777 rec->tool.ordered_events = false; 1778 } 1779 1780 if (!rec->evlist->core.nr_groups) 1781 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC); 1782 1783 if (data->is_pipe) { 1784 err = perf_header__write_pipe(fd); 1785 if (err < 0) 1786 goto out_child; 1787 } else { 1788 err = perf_session__write_header(session, rec->evlist, fd, false); 1789 if (err < 0) 1790 goto out_child; 1791 } 1792 1793 err = -1; 1794 if (!rec->no_buildid 1795 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) { 1796 pr_err("Couldn't generate buildids. " 1797 "Use --no-buildid to profile anyway.\n"); 1798 goto out_child; 1799 } 1800 1801 err = record__setup_sb_evlist(rec); 1802 if (err) 1803 goto out_child; 1804 1805 err = record__synthesize(rec, false); 1806 if (err < 0) 1807 goto out_child; 1808 1809 if (rec->realtime_prio) { 1810 struct sched_param param; 1811 1812 param.sched_priority = rec->realtime_prio; 1813 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { 1814 pr_err("Could not set realtime priority.\n"); 1815 err = -1; 1816 goto out_child; 1817 } 1818 } 1819 1820 /* 1821 * When perf is starting the traced process, all the events 1822 * (apart from group members) have enable_on_exec=1 set, 1823 * so don't spoil it by prematurely enabling them. 1824 */ 1825 if (!target__none(&opts->target) && !opts->initial_delay) 1826 evlist__enable(rec->evlist); 1827 1828 /* 1829 * Let the child rip 1830 */ 1831 if (forks) { 1832 struct machine *machine = &session->machines.host; 1833 union perf_event *event; 1834 pid_t tgid; 1835 1836 event = malloc(sizeof(event->comm) + machine->id_hdr_size); 1837 if (event == NULL) { 1838 err = -ENOMEM; 1839 goto out_child; 1840 } 1841 1842 /* 1843 * Some H/W events are generated before COMM event 1844 * which is emitted during exec(), so perf script 1845 * cannot see a correct process name for those events. 1846 * Synthesize COMM event to prevent it. 1847 */ 1848 tgid = perf_event__synthesize_comm(tool, event, 1849 rec->evlist->workload.pid, 1850 process_synthesized_event, 1851 machine); 1852 free(event); 1853 1854 if (tgid == -1) 1855 goto out_child; 1856 1857 event = malloc(sizeof(event->namespaces) + 1858 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 1859 machine->id_hdr_size); 1860 if (event == NULL) { 1861 err = -ENOMEM; 1862 goto out_child; 1863 } 1864 1865 /* 1866 * Synthesize NAMESPACES event for the command specified. 1867 */ 1868 perf_event__synthesize_namespaces(tool, event, 1869 rec->evlist->workload.pid, 1870 tgid, process_synthesized_event, 1871 machine); 1872 free(event); 1873 1874 evlist__start_workload(rec->evlist); 1875 } 1876 1877 if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack)) 1878 goto out_child; 1879 1880 if (opts->initial_delay) { 1881 pr_info(EVLIST_DISABLED_MSG); 1882 if (opts->initial_delay > 0) { 1883 usleep(opts->initial_delay * USEC_PER_MSEC); 1884 evlist__enable(rec->evlist); 1885 pr_info(EVLIST_ENABLED_MSG); 1886 } 1887 } 1888 1889 trigger_ready(&auxtrace_snapshot_trigger); 1890 trigger_ready(&switch_output_trigger); 1891 perf_hooks__invoke_record_start(); 1892 for (;;) { 1893 unsigned long long hits = rec->samples; 1894 1895 /* 1896 * rec->evlist->bkw_mmap_state is possible to be 1897 * BKW_MMAP_EMPTY here: when done == true and 1898 * hits != rec->samples in previous round. 1899 * 1900 * evlist__toggle_bkw_mmap ensure we never 1901 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING. 1902 */ 1903 if (trigger_is_hit(&switch_output_trigger) || done || draining) 1904 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING); 1905 1906 if (record__mmap_read_all(rec, false) < 0) { 1907 trigger_error(&auxtrace_snapshot_trigger); 1908 trigger_error(&switch_output_trigger); 1909 err = -1; 1910 goto out_child; 1911 } 1912 1913 if (auxtrace_record__snapshot_started) { 1914 auxtrace_record__snapshot_started = 0; 1915 if (!trigger_is_error(&auxtrace_snapshot_trigger)) 1916 record__read_auxtrace_snapshot(rec, false); 1917 if (trigger_is_error(&auxtrace_snapshot_trigger)) { 1918 pr_err("AUX area tracing snapshot failed\n"); 1919 err = -1; 1920 goto out_child; 1921 } 1922 } 1923 1924 if (trigger_is_hit(&switch_output_trigger)) { 1925 /* 1926 * If switch_output_trigger is hit, the data in 1927 * overwritable ring buffer should have been collected, 1928 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY. 1929 * 1930 * If SIGUSR2 raise after or during record__mmap_read_all(), 1931 * record__mmap_read_all() didn't collect data from 1932 * overwritable ring buffer. Read again. 1933 */ 1934 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING) 1935 continue; 1936 trigger_ready(&switch_output_trigger); 1937 1938 /* 1939 * Reenable events in overwrite ring buffer after 1940 * record__mmap_read_all(): we should have collected 1941 * data from it. 1942 */ 1943 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING); 1944 1945 if (!quiet) 1946 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", 1947 waking); 1948 waking = 0; 1949 fd = record__switch_output(rec, false); 1950 if (fd < 0) { 1951 pr_err("Failed to switch to new file\n"); 1952 trigger_error(&switch_output_trigger); 1953 err = fd; 1954 goto out_child; 1955 } 1956 1957 /* re-arm the alarm */ 1958 if (rec->switch_output.time) 1959 alarm(rec->switch_output.time); 1960 } 1961 1962 if (hits == rec->samples) { 1963 if (done || draining) 1964 break; 1965 err = evlist__poll(rec->evlist, -1); 1966 /* 1967 * Propagate error, only if there's any. Ignore positive 1968 * number of returned events and interrupt error. 1969 */ 1970 if (err > 0 || (err < 0 && errno == EINTR)) 1971 err = 0; 1972 waking++; 1973 1974 if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0) 1975 draining = true; 1976 } 1977 1978 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) { 1979 switch (cmd) { 1980 case EVLIST_CTL_CMD_SNAPSHOT: 1981 hit_auxtrace_snapshot_trigger(rec); 1982 evlist__ctlfd_ack(rec->evlist); 1983 break; 1984 case EVLIST_CTL_CMD_STOP: 1985 done = 1; 1986 break; 1987 case EVLIST_CTL_CMD_ACK: 1988 case EVLIST_CTL_CMD_UNSUPPORTED: 1989 case EVLIST_CTL_CMD_ENABLE: 1990 case EVLIST_CTL_CMD_DISABLE: 1991 case EVLIST_CTL_CMD_EVLIST: 1992 case EVLIST_CTL_CMD_PING: 1993 default: 1994 break; 1995 } 1996 } 1997 1998 /* 1999 * When perf is starting the traced process, at the end events 2000 * die with the process and we wait for that. Thus no need to 2001 * disable events in this case. 2002 */ 2003 if (done && !disabled && !target__none(&opts->target)) { 2004 trigger_off(&auxtrace_snapshot_trigger); 2005 evlist__disable(rec->evlist); 2006 disabled = true; 2007 } 2008 } 2009 2010 trigger_off(&auxtrace_snapshot_trigger); 2011 trigger_off(&switch_output_trigger); 2012 2013 if (opts->auxtrace_snapshot_on_exit) 2014 record__auxtrace_snapshot_exit(rec); 2015 2016 if (forks && workload_exec_errno) { 2017 char msg[STRERR_BUFSIZE], strevsels[2048]; 2018 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg)); 2019 2020 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels); 2021 2022 pr_err("Failed to collect '%s' for the '%s' workload: %s\n", 2023 strevsels, argv[0], emsg); 2024 err = -1; 2025 goto out_child; 2026 } 2027 2028 if (!quiet) 2029 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); 2030 2031 if (target__none(&rec->opts.target)) 2032 record__synthesize_workload(rec, true); 2033 2034 out_child: 2035 evlist__finalize_ctlfd(rec->evlist); 2036 record__mmap_read_all(rec, true); 2037 record__aio_mmap_read_sync(rec); 2038 2039 if (rec->session->bytes_transferred && rec->session->bytes_compressed) { 2040 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed; 2041 session->header.env.comp_ratio = ratio + 0.5; 2042 } 2043 2044 if (forks) { 2045 int exit_status; 2046 2047 if (!child_finished) 2048 kill(rec->evlist->workload.pid, SIGTERM); 2049 2050 wait(&exit_status); 2051 2052 if (err < 0) 2053 status = err; 2054 else if (WIFEXITED(exit_status)) 2055 status = WEXITSTATUS(exit_status); 2056 else if (WIFSIGNALED(exit_status)) 2057 signr = WTERMSIG(exit_status); 2058 } else 2059 status = err; 2060 2061 record__synthesize(rec, true); 2062 /* this will be recalculated during process_buildids() */ 2063 rec->samples = 0; 2064 2065 if (!err) { 2066 if (!rec->timestamp_filename) { 2067 record__finish_output(rec); 2068 } else { 2069 fd = record__switch_output(rec, true); 2070 if (fd < 0) { 2071 status = fd; 2072 goto out_delete_session; 2073 } 2074 } 2075 } 2076 2077 perf_hooks__invoke_record_end(); 2078 2079 if (!err && !quiet) { 2080 char samples[128]; 2081 const char *postfix = rec->timestamp_filename ? 2082 ".<timestamp>" : ""; 2083 2084 if (rec->samples && !rec->opts.full_auxtrace) 2085 scnprintf(samples, sizeof(samples), 2086 " (%" PRIu64 " samples)", rec->samples); 2087 else 2088 samples[0] = '\0'; 2089 2090 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s", 2091 perf_data__size(data) / 1024.0 / 1024.0, 2092 data->path, postfix, samples); 2093 if (ratio) { 2094 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)", 2095 rec->session->bytes_transferred / 1024.0 / 1024.0, 2096 ratio); 2097 } 2098 fprintf(stderr, " ]\n"); 2099 } 2100 2101 out_delete_session: 2102 #ifdef HAVE_EVENTFD_SUPPORT 2103 if (done_fd >= 0) 2104 close(done_fd); 2105 #endif 2106 zstd_fini(&session->zstd_data); 2107 perf_session__delete(session); 2108 2109 if (!opts->no_bpf_event) 2110 evlist__stop_sb_thread(rec->sb_evlist); 2111 return status; 2112 } 2113 2114 static void callchain_debug(struct callchain_param *callchain) 2115 { 2116 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" }; 2117 2118 pr_debug("callchain: type %s\n", str[callchain->record_mode]); 2119 2120 if (callchain->record_mode == CALLCHAIN_DWARF) 2121 pr_debug("callchain: stack dump size %d\n", 2122 callchain->dump_size); 2123 } 2124 2125 int record_opts__parse_callchain(struct record_opts *record, 2126 struct callchain_param *callchain, 2127 const char *arg, bool unset) 2128 { 2129 int ret; 2130 callchain->enabled = !unset; 2131 2132 /* --no-call-graph */ 2133 if (unset) { 2134 callchain->record_mode = CALLCHAIN_NONE; 2135 pr_debug("callchain: disabled\n"); 2136 return 0; 2137 } 2138 2139 ret = parse_callchain_record_opt(arg, callchain); 2140 if (!ret) { 2141 /* Enable data address sampling for DWARF unwind. */ 2142 if (callchain->record_mode == CALLCHAIN_DWARF) 2143 record->sample_address = true; 2144 callchain_debug(callchain); 2145 } 2146 2147 return ret; 2148 } 2149 2150 int record_parse_callchain_opt(const struct option *opt, 2151 const char *arg, 2152 int unset) 2153 { 2154 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset); 2155 } 2156 2157 int record_callchain_opt(const struct option *opt, 2158 const char *arg __maybe_unused, 2159 int unset __maybe_unused) 2160 { 2161 struct callchain_param *callchain = opt->value; 2162 2163 callchain->enabled = true; 2164 2165 if (callchain->record_mode == CALLCHAIN_NONE) 2166 callchain->record_mode = CALLCHAIN_FP; 2167 2168 callchain_debug(callchain); 2169 return 0; 2170 } 2171 2172 static int perf_record_config(const char *var, const char *value, void *cb) 2173 { 2174 struct record *rec = cb; 2175 2176 if (!strcmp(var, "record.build-id")) { 2177 if (!strcmp(value, "cache")) 2178 rec->no_buildid_cache = false; 2179 else if (!strcmp(value, "no-cache")) 2180 rec->no_buildid_cache = true; 2181 else if (!strcmp(value, "skip")) 2182 rec->no_buildid = true; 2183 else if (!strcmp(value, "mmap")) 2184 rec->buildid_mmap = true; 2185 else 2186 return -1; 2187 return 0; 2188 } 2189 if (!strcmp(var, "record.call-graph")) { 2190 var = "call-graph.record-mode"; 2191 return perf_default_config(var, value, cb); 2192 } 2193 #ifdef HAVE_AIO_SUPPORT 2194 if (!strcmp(var, "record.aio")) { 2195 rec->opts.nr_cblocks = strtol(value, NULL, 0); 2196 if (!rec->opts.nr_cblocks) 2197 rec->opts.nr_cblocks = nr_cblocks_default; 2198 } 2199 #endif 2200 2201 return 0; 2202 } 2203 2204 2205 static int record__parse_affinity(const struct option *opt, const char *str, int unset) 2206 { 2207 struct record_opts *opts = (struct record_opts *)opt->value; 2208 2209 if (unset || !str) 2210 return 0; 2211 2212 if (!strcasecmp(str, "node")) 2213 opts->affinity = PERF_AFFINITY_NODE; 2214 else if (!strcasecmp(str, "cpu")) 2215 opts->affinity = PERF_AFFINITY_CPU; 2216 2217 return 0; 2218 } 2219 2220 static int parse_output_max_size(const struct option *opt, 2221 const char *str, int unset) 2222 { 2223 unsigned long *s = (unsigned long *)opt->value; 2224 static struct parse_tag tags_size[] = { 2225 { .tag = 'B', .mult = 1 }, 2226 { .tag = 'K', .mult = 1 << 10 }, 2227 { .tag = 'M', .mult = 1 << 20 }, 2228 { .tag = 'G', .mult = 1 << 30 }, 2229 { .tag = 0 }, 2230 }; 2231 unsigned long val; 2232 2233 if (unset) { 2234 *s = 0; 2235 return 0; 2236 } 2237 2238 val = parse_tag_value(str, tags_size); 2239 if (val != (unsigned long) -1) { 2240 *s = val; 2241 return 0; 2242 } 2243 2244 return -1; 2245 } 2246 2247 static int record__parse_mmap_pages(const struct option *opt, 2248 const char *str, 2249 int unset __maybe_unused) 2250 { 2251 struct record_opts *opts = opt->value; 2252 char *s, *p; 2253 unsigned int mmap_pages; 2254 int ret; 2255 2256 if (!str) 2257 return -EINVAL; 2258 2259 s = strdup(str); 2260 if (!s) 2261 return -ENOMEM; 2262 2263 p = strchr(s, ','); 2264 if (p) 2265 *p = '\0'; 2266 2267 if (*s) { 2268 ret = __evlist__parse_mmap_pages(&mmap_pages, s); 2269 if (ret) 2270 goto out_free; 2271 opts->mmap_pages = mmap_pages; 2272 } 2273 2274 if (!p) { 2275 ret = 0; 2276 goto out_free; 2277 } 2278 2279 ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1); 2280 if (ret) 2281 goto out_free; 2282 2283 opts->auxtrace_mmap_pages = mmap_pages; 2284 2285 out_free: 2286 free(s); 2287 return ret; 2288 } 2289 2290 static int parse_control_option(const struct option *opt, 2291 const char *str, 2292 int unset __maybe_unused) 2293 { 2294 struct record_opts *opts = opt->value; 2295 2296 return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close); 2297 } 2298 2299 static void switch_output_size_warn(struct record *rec) 2300 { 2301 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages); 2302 struct switch_output *s = &rec->switch_output; 2303 2304 wakeup_size /= 2; 2305 2306 if (s->size < wakeup_size) { 2307 char buf[100]; 2308 2309 unit_number__scnprintf(buf, sizeof(buf), wakeup_size); 2310 pr_warning("WARNING: switch-output data size lower than " 2311 "wakeup kernel buffer size (%s) " 2312 "expect bigger perf.data sizes\n", buf); 2313 } 2314 } 2315 2316 static int switch_output_setup(struct record *rec) 2317 { 2318 struct switch_output *s = &rec->switch_output; 2319 static struct parse_tag tags_size[] = { 2320 { .tag = 'B', .mult = 1 }, 2321 { .tag = 'K', .mult = 1 << 10 }, 2322 { .tag = 'M', .mult = 1 << 20 }, 2323 { .tag = 'G', .mult = 1 << 30 }, 2324 { .tag = 0 }, 2325 }; 2326 static struct parse_tag tags_time[] = { 2327 { .tag = 's', .mult = 1 }, 2328 { .tag = 'm', .mult = 60 }, 2329 { .tag = 'h', .mult = 60*60 }, 2330 { .tag = 'd', .mult = 60*60*24 }, 2331 { .tag = 0 }, 2332 }; 2333 unsigned long val; 2334 2335 /* 2336 * If we're using --switch-output-events, then we imply its 2337 * --switch-output=signal, as we'll send a SIGUSR2 from the side band 2338 * thread to its parent. 2339 */ 2340 if (rec->switch_output_event_set) 2341 goto do_signal; 2342 2343 if (!s->set) 2344 return 0; 2345 2346 if (!strcmp(s->str, "signal")) { 2347 do_signal: 2348 s->signal = true; 2349 pr_debug("switch-output with SIGUSR2 signal\n"); 2350 goto enabled; 2351 } 2352 2353 val = parse_tag_value(s->str, tags_size); 2354 if (val != (unsigned long) -1) { 2355 s->size = val; 2356 pr_debug("switch-output with %s size threshold\n", s->str); 2357 goto enabled; 2358 } 2359 2360 val = parse_tag_value(s->str, tags_time); 2361 if (val != (unsigned long) -1) { 2362 s->time = val; 2363 pr_debug("switch-output with %s time threshold (%lu seconds)\n", 2364 s->str, s->time); 2365 goto enabled; 2366 } 2367 2368 return -1; 2369 2370 enabled: 2371 rec->timestamp_filename = true; 2372 s->enabled = true; 2373 2374 if (s->size && !rec->opts.no_buffering) 2375 switch_output_size_warn(rec); 2376 2377 return 0; 2378 } 2379 2380 static const char * const __record_usage[] = { 2381 "perf record [<options>] [<command>]", 2382 "perf record [<options>] -- <command> [<options>]", 2383 NULL 2384 }; 2385 const char * const *record_usage = __record_usage; 2386 2387 static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event, 2388 struct perf_sample *sample, struct machine *machine) 2389 { 2390 /* 2391 * We already have the kernel maps, put in place via perf_session__create_kernel_maps() 2392 * no need to add them twice. 2393 */ 2394 if (!(event->header.misc & PERF_RECORD_MISC_USER)) 2395 return 0; 2396 return perf_event__process_mmap(tool, event, sample, machine); 2397 } 2398 2399 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event, 2400 struct perf_sample *sample, struct machine *machine) 2401 { 2402 /* 2403 * We already have the kernel maps, put in place via perf_session__create_kernel_maps() 2404 * no need to add them twice. 2405 */ 2406 if (!(event->header.misc & PERF_RECORD_MISC_USER)) 2407 return 0; 2408 2409 return perf_event__process_mmap2(tool, event, sample, machine); 2410 } 2411 2412 static int process_timestamp_boundary(struct perf_tool *tool, 2413 union perf_event *event __maybe_unused, 2414 struct perf_sample *sample, 2415 struct machine *machine __maybe_unused) 2416 { 2417 struct record *rec = container_of(tool, struct record, tool); 2418 2419 set_timestamp_boundary(rec, sample->time); 2420 return 0; 2421 } 2422 2423 /* 2424 * XXX Ideally would be local to cmd_record() and passed to a record__new 2425 * because we need to have access to it in record__exit, that is called 2426 * after cmd_record() exits, but since record_options need to be accessible to 2427 * builtin-script, leave it here. 2428 * 2429 * At least we don't ouch it in all the other functions here directly. 2430 * 2431 * Just say no to tons of global variables, sigh. 2432 */ 2433 static struct record record = { 2434 .opts = { 2435 .sample_time = true, 2436 .mmap_pages = UINT_MAX, 2437 .user_freq = UINT_MAX, 2438 .user_interval = ULLONG_MAX, 2439 .freq = 4000, 2440 .target = { 2441 .uses_mmap = true, 2442 .default_per_cpu = true, 2443 }, 2444 .mmap_flush = MMAP_FLUSH_DEFAULT, 2445 .nr_threads_synthesize = 1, 2446 .ctl_fd = -1, 2447 .ctl_fd_ack = -1, 2448 }, 2449 .tool = { 2450 .sample = process_sample_event, 2451 .fork = perf_event__process_fork, 2452 .exit = perf_event__process_exit, 2453 .comm = perf_event__process_comm, 2454 .namespaces = perf_event__process_namespaces, 2455 .mmap = build_id__process_mmap, 2456 .mmap2 = build_id__process_mmap2, 2457 .itrace_start = process_timestamp_boundary, 2458 .aux = process_timestamp_boundary, 2459 .ordered_events = true, 2460 }, 2461 }; 2462 2463 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP 2464 "\n\t\t\t\tDefault: fp"; 2465 2466 static bool dry_run; 2467 2468 /* 2469 * XXX Will stay a global variable till we fix builtin-script.c to stop messing 2470 * with it and switch to use the library functions in perf_evlist that came 2471 * from builtin-record.c, i.e. use record_opts, 2472 * evlist__prepare_workload, etc instead of fork+exec'in 'perf record', 2473 * using pipes, etc. 2474 */ 2475 static struct option __record_options[] = { 2476 OPT_CALLBACK('e', "event", &record.evlist, "event", 2477 "event selector. use 'perf list' to list available events", 2478 parse_events_option), 2479 OPT_CALLBACK(0, "filter", &record.evlist, "filter", 2480 "event filter", parse_filter), 2481 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist, 2482 NULL, "don't record events from perf itself", 2483 exclude_perf), 2484 OPT_STRING('p', "pid", &record.opts.target.pid, "pid", 2485 "record events on existing process id"), 2486 OPT_STRING('t', "tid", &record.opts.target.tid, "tid", 2487 "record events on existing thread id"), 2488 OPT_INTEGER('r', "realtime", &record.realtime_prio, 2489 "collect data with this RT SCHED_FIFO priority"), 2490 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering, 2491 "collect data without buffering"), 2492 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples, 2493 "collect raw sample records from all opened counters"), 2494 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide, 2495 "system-wide collection from all CPUs"), 2496 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu", 2497 "list of cpus to monitor"), 2498 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"), 2499 OPT_STRING('o', "output", &record.data.path, "file", 2500 "output file name"), 2501 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit, 2502 &record.opts.no_inherit_set, 2503 "child tasks do not inherit counters"), 2504 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, 2505 "synthesize non-sample events at the end of output"), 2506 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), 2507 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"), 2508 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq, 2509 "Fail if the specified frequency can't be used"), 2510 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'", 2511 "profile at this frequency", 2512 record__parse_freq), 2513 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", 2514 "number of mmap data pages and AUX area tracing mmap pages", 2515 record__parse_mmap_pages), 2516 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number", 2517 "Minimal number of bytes that is extracted from mmap data pages (default: 1)", 2518 record__mmap_flush_parse), 2519 OPT_BOOLEAN(0, "group", &record.opts.group, 2520 "put the counters into a counter group"), 2521 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, 2522 NULL, "enables call-graph recording" , 2523 &record_callchain_opt), 2524 OPT_CALLBACK(0, "call-graph", &record.opts, 2525 "record_mode[,record_size]", record_callchain_help, 2526 &record_parse_callchain_opt), 2527 OPT_INCR('v', "verbose", &verbose, 2528 "be more verbose (show counter open errors, etc)"), 2529 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), 2530 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat, 2531 "per thread counts"), 2532 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"), 2533 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr, 2534 "Record the sample physical addresses"), 2535 OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size, 2536 "Record the sampled data address data page size"), 2537 OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size, 2538 "Record the sampled code address (ip) page size"), 2539 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"), 2540 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time, 2541 &record.opts.sample_time_set, 2542 "Record the sample timestamps"), 2543 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set, 2544 "Record the sample period"), 2545 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples, 2546 "don't sample"), 2547 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache, 2548 &record.no_buildid_cache_set, 2549 "do not update the buildid cache"), 2550 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid, 2551 &record.no_buildid_set, 2552 "do not collect buildids in perf.data"), 2553 OPT_CALLBACK('G', "cgroup", &record.evlist, "name", 2554 "monitor event in cgroup name only", 2555 parse_cgroups), 2556 OPT_INTEGER('D', "delay", &record.opts.initial_delay, 2557 "ms to wait before starting measurement after program start (-1: start with events disabled)"), 2558 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"), 2559 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user", 2560 "user to profile"), 2561 2562 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack, 2563 "branch any", "sample any taken branches", 2564 parse_branch_stack), 2565 2566 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack, 2567 "branch filter mask", "branch stack filter modes", 2568 parse_branch_stack), 2569 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight, 2570 "sample by weight (on special events only)"), 2571 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction, 2572 "sample transaction flags (special events only)"), 2573 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread, 2574 "use per-thread mmaps"), 2575 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register", 2576 "sample selected machine registers on interrupt," 2577 " use '-I?' to list register names", parse_intr_regs), 2578 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register", 2579 "sample selected machine registers on interrupt," 2580 " use '--user-regs=?' to list register names", parse_user_regs), 2581 OPT_BOOLEAN(0, "running-time", &record.opts.running_time, 2582 "Record running/enabled time of read (:S) events"), 2583 OPT_CALLBACK('k', "clockid", &record.opts, 2584 "clockid", "clockid to use for events, see clock_gettime()", 2585 parse_clockid), 2586 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts, 2587 "opts", "AUX area tracing Snapshot Mode", ""), 2588 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts, 2589 "opts", "sample AUX area", ""), 2590 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout, 2591 "per thread proc mmap processing timeout in ms"), 2592 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces, 2593 "Record namespaces events"), 2594 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup, 2595 "Record cgroup events"), 2596 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events, 2597 &record.opts.record_switch_events_set, 2598 "Record context switch events"), 2599 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel, 2600 "Configure all used events to run in kernel space.", 2601 PARSE_OPT_EXCLUSIVE), 2602 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user, 2603 "Configure all used events to run in user space.", 2604 PARSE_OPT_EXCLUSIVE), 2605 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains, 2606 "collect kernel callchains"), 2607 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains, 2608 "collect user callchains"), 2609 OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path", 2610 "clang binary to use for compiling BPF scriptlets"), 2611 OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options", 2612 "options passed to clang when compiling BPF scriptlets"), 2613 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, 2614 "file", "vmlinux pathname"), 2615 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all, 2616 "Record build-id of all DSOs regardless of hits"), 2617 OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap, 2618 "Record build-id in map events"), 2619 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename, 2620 "append timestamp to output filename"), 2621 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary, 2622 "Record timestamp boundary (time of first/last samples)"), 2623 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str, 2624 &record.switch_output.set, "signal or size[BKMG] or time[smhd]", 2625 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold", 2626 "signal"), 2627 OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event", 2628 "switch output event selector. use 'perf list' to list available events", 2629 parse_events_option_new_evlist), 2630 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files, 2631 "Limit number of switch output generated files"), 2632 OPT_BOOLEAN(0, "dry-run", &dry_run, 2633 "Parse options then exit"), 2634 #ifdef HAVE_AIO_SUPPORT 2635 OPT_CALLBACK_OPTARG(0, "aio", &record.opts, 2636 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)", 2637 record__aio_parse), 2638 #endif 2639 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu", 2640 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer", 2641 record__parse_affinity), 2642 #ifdef HAVE_ZSTD_SUPPORT 2643 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, 2644 "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)", 2645 record__parse_comp_level), 2646 #endif 2647 OPT_CALLBACK(0, "max-size", &record.output_max_size, 2648 "size", "Limit the maximum size of the output file", parse_output_max_size), 2649 OPT_UINTEGER(0, "num-thread-synthesize", 2650 &record.opts.nr_threads_synthesize, 2651 "number of threads to run for event synthesis"), 2652 #ifdef HAVE_LIBPFM 2653 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event", 2654 "libpfm4 event selector. use 'perf list' to list available events", 2655 parse_libpfm_events_option), 2656 #endif 2657 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]", 2658 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n" 2659 "\t\t\t 'snapshot': AUX area tracing snapshot).\n" 2660 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n" 2661 "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.", 2662 parse_control_option), 2663 OPT_END() 2664 }; 2665 2666 struct option *record_options = __record_options; 2667 2668 int cmd_record(int argc, const char **argv) 2669 { 2670 int err; 2671 struct record *rec = &record; 2672 char errbuf[BUFSIZ]; 2673 2674 setlocale(LC_ALL, ""); 2675 2676 #ifndef HAVE_LIBBPF_SUPPORT 2677 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c) 2678 set_nobuild('\0', "clang-path", true); 2679 set_nobuild('\0', "clang-opt", true); 2680 # undef set_nobuild 2681 #endif 2682 2683 #ifndef HAVE_BPF_PROLOGUE 2684 # if !defined (HAVE_DWARF_SUPPORT) 2685 # define REASON "NO_DWARF=1" 2686 # elif !defined (HAVE_LIBBPF_SUPPORT) 2687 # define REASON "NO_LIBBPF=1" 2688 # else 2689 # define REASON "this architecture doesn't support BPF prologue" 2690 # endif 2691 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c) 2692 set_nobuild('\0', "vmlinux", true); 2693 # undef set_nobuild 2694 # undef REASON 2695 #endif 2696 2697 rec->opts.affinity = PERF_AFFINITY_SYS; 2698 2699 rec->evlist = evlist__new(); 2700 if (rec->evlist == NULL) 2701 return -ENOMEM; 2702 2703 err = perf_config(perf_record_config, rec); 2704 if (err) 2705 return err; 2706 2707 argc = parse_options(argc, argv, record_options, record_usage, 2708 PARSE_OPT_STOP_AT_NON_OPTION); 2709 if (quiet) 2710 perf_quiet_option(); 2711 2712 /* Make system wide (-a) the default target. */ 2713 if (!argc && target__none(&rec->opts.target)) 2714 rec->opts.target.system_wide = true; 2715 2716 if (nr_cgroups && !rec->opts.target.system_wide) { 2717 usage_with_options_msg(record_usage, record_options, 2718 "cgroup monitoring only available in system-wide mode"); 2719 2720 } 2721 2722 if (rec->buildid_mmap) { 2723 if (!perf_can_record_build_id()) { 2724 pr_err("Failed: no support to record build id in mmap events, update your kernel.\n"); 2725 err = -EINVAL; 2726 goto out_opts; 2727 } 2728 pr_debug("Enabling build id in mmap2 events.\n"); 2729 /* Enable mmap build id synthesizing. */ 2730 symbol_conf.buildid_mmap2 = true; 2731 /* Enable perf_event_attr::build_id bit. */ 2732 rec->opts.build_id = true; 2733 /* Disable build id cache. */ 2734 rec->no_buildid = true; 2735 } 2736 2737 if (rec->opts.record_cgroup && !perf_can_record_cgroup()) { 2738 pr_err("Kernel has no cgroup sampling support.\n"); 2739 err = -EINVAL; 2740 goto out_opts; 2741 } 2742 2743 if (rec->opts.kcore) 2744 rec->data.is_dir = true; 2745 2746 if (rec->opts.comp_level != 0) { 2747 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n"); 2748 rec->no_buildid = true; 2749 } 2750 2751 if (rec->opts.record_switch_events && 2752 !perf_can_record_switch_events()) { 2753 ui__error("kernel does not support recording context switch events\n"); 2754 parse_options_usage(record_usage, record_options, "switch-events", 0); 2755 err = -EINVAL; 2756 goto out_opts; 2757 } 2758 2759 if (switch_output_setup(rec)) { 2760 parse_options_usage(record_usage, record_options, "switch-output", 0); 2761 err = -EINVAL; 2762 goto out_opts; 2763 } 2764 2765 if (rec->switch_output.time) { 2766 signal(SIGALRM, alarm_sig_handler); 2767 alarm(rec->switch_output.time); 2768 } 2769 2770 if (rec->switch_output.num_files) { 2771 rec->switch_output.filenames = calloc(sizeof(char *), 2772 rec->switch_output.num_files); 2773 if (!rec->switch_output.filenames) { 2774 err = -EINVAL; 2775 goto out_opts; 2776 } 2777 } 2778 2779 /* 2780 * Allow aliases to facilitate the lookup of symbols for address 2781 * filters. Refer to auxtrace_parse_filters(). 2782 */ 2783 symbol_conf.allow_aliases = true; 2784 2785 symbol__init(NULL); 2786 2787 if (rec->opts.affinity != PERF_AFFINITY_SYS) { 2788 rec->affinity_mask.nbits = cpu__max_cpu(); 2789 rec->affinity_mask.bits = bitmap_alloc(rec->affinity_mask.nbits); 2790 if (!rec->affinity_mask.bits) { 2791 pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits); 2792 err = -ENOMEM; 2793 goto out_opts; 2794 } 2795 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits); 2796 } 2797 2798 err = record__auxtrace_init(rec); 2799 if (err) 2800 goto out; 2801 2802 if (dry_run) 2803 goto out; 2804 2805 err = bpf__setup_stdout(rec->evlist); 2806 if (err) { 2807 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf)); 2808 pr_err("ERROR: Setup BPF stdout failed: %s\n", 2809 errbuf); 2810 goto out; 2811 } 2812 2813 err = -ENOMEM; 2814 2815 if (rec->no_buildid_cache || rec->no_buildid) { 2816 disable_buildid_cache(); 2817 } else if (rec->switch_output.enabled) { 2818 /* 2819 * In 'perf record --switch-output', disable buildid 2820 * generation by default to reduce data file switching 2821 * overhead. Still generate buildid if they are required 2822 * explicitly using 2823 * 2824 * perf record --switch-output --no-no-buildid \ 2825 * --no-no-buildid-cache 2826 * 2827 * Following code equals to: 2828 * 2829 * if ((rec->no_buildid || !rec->no_buildid_set) && 2830 * (rec->no_buildid_cache || !rec->no_buildid_cache_set)) 2831 * disable_buildid_cache(); 2832 */ 2833 bool disable = true; 2834 2835 if (rec->no_buildid_set && !rec->no_buildid) 2836 disable = false; 2837 if (rec->no_buildid_cache_set && !rec->no_buildid_cache) 2838 disable = false; 2839 if (disable) { 2840 rec->no_buildid = true; 2841 rec->no_buildid_cache = true; 2842 disable_buildid_cache(); 2843 } 2844 } 2845 2846 if (record.opts.overwrite) 2847 record.opts.tail_synthesize = true; 2848 2849 if (rec->evlist->core.nr_entries == 0) { 2850 if (perf_pmu__has_hybrid()) { 2851 err = evlist__add_default_hybrid(rec->evlist, 2852 !record.opts.no_samples); 2853 } else { 2854 err = __evlist__add_default(rec->evlist, 2855 !record.opts.no_samples); 2856 } 2857 2858 if (err < 0) { 2859 pr_err("Not enough memory for event selector list\n"); 2860 goto out; 2861 } 2862 } 2863 2864 if (rec->opts.target.tid && !rec->opts.no_inherit_set) 2865 rec->opts.no_inherit = true; 2866 2867 err = target__validate(&rec->opts.target); 2868 if (err) { 2869 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); 2870 ui__warning("%s\n", errbuf); 2871 } 2872 2873 err = target__parse_uid(&rec->opts.target); 2874 if (err) { 2875 int saved_errno = errno; 2876 2877 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); 2878 ui__error("%s", errbuf); 2879 2880 err = -saved_errno; 2881 goto out; 2882 } 2883 2884 /* Enable ignoring missing threads when -u/-p option is defined. */ 2885 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid; 2886 2887 err = -ENOMEM; 2888 if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) 2889 usage_with_options(record_usage, record_options); 2890 2891 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts); 2892 if (err) 2893 goto out; 2894 2895 /* 2896 * We take all buildids when the file contains 2897 * AUX area tracing data because we do not decode the 2898 * trace because it would take too long. 2899 */ 2900 if (rec->opts.full_auxtrace) 2901 rec->buildid_all = true; 2902 2903 if (rec->opts.text_poke) { 2904 err = record__config_text_poke(rec->evlist); 2905 if (err) { 2906 pr_err("record__config_text_poke failed, error %d\n", err); 2907 goto out; 2908 } 2909 } 2910 2911 if (record_opts__config(&rec->opts)) { 2912 err = -EINVAL; 2913 goto out; 2914 } 2915 2916 if (rec->opts.nr_cblocks > nr_cblocks_max) 2917 rec->opts.nr_cblocks = nr_cblocks_max; 2918 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks); 2919 2920 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]); 2921 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush); 2922 2923 if (rec->opts.comp_level > comp_level_max) 2924 rec->opts.comp_level = comp_level_max; 2925 pr_debug("comp level: %d\n", rec->opts.comp_level); 2926 2927 err = __cmd_record(&record, argc, argv); 2928 out: 2929 bitmap_free(rec->affinity_mask.bits); 2930 evlist__delete(rec->evlist); 2931 symbol__exit(); 2932 auxtrace_record__free(rec->itr); 2933 out_opts: 2934 evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close); 2935 return err; 2936 } 2937 2938 static void snapshot_sig_handler(int sig __maybe_unused) 2939 { 2940 struct record *rec = &record; 2941 2942 hit_auxtrace_snapshot_trigger(rec); 2943 2944 if (switch_output_signal(rec)) 2945 trigger_hit(&switch_output_trigger); 2946 } 2947 2948 static void alarm_sig_handler(int sig __maybe_unused) 2949 { 2950 struct record *rec = &record; 2951 2952 if (switch_output_time(rec)) 2953 trigger_hit(&switch_output_trigger); 2954 } 2955