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 <internal/xyarray.h> 14 #include "util/parse-events.h" 15 #include "util/config.h" 16 17 #include "util/callchain.h" 18 #include "util/cgroup.h" 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/mmap.h" 25 #include "util/mutex.h" 26 #include "util/target.h" 27 #include "util/session.h" 28 #include "util/tool.h" 29 #include "util/symbol.h" 30 #include "util/record.h" 31 #include "util/cpumap.h" 32 #include "util/thread_map.h" 33 #include "util/data.h" 34 #include "util/perf_regs.h" 35 #include "util/auxtrace.h" 36 #include "util/tsc.h" 37 #include "util/parse-branch-options.h" 38 #include "util/parse-regs-options.h" 39 #include "util/perf_api_probe.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/pmu.h" 50 #include "util/pmus.h" 51 #include "util/clockid.h" 52 #include "util/off_cpu.h" 53 #include "util/bpf-filter.h" 54 #include "asm/bug.h" 55 #include "perf.h" 56 #include "cputopo.h" 57 58 #include <errno.h> 59 #include <inttypes.h> 60 #include <locale.h> 61 #include <poll.h> 62 #include <pthread.h> 63 #include <unistd.h> 64 #ifndef HAVE_GETTID 65 #include <syscall.h> 66 #endif 67 #include <sched.h> 68 #include <signal.h> 69 #ifdef HAVE_EVENTFD_SUPPORT 70 #include <sys/eventfd.h> 71 #endif 72 #include <sys/mman.h> 73 #include <sys/wait.h> 74 #include <sys/types.h> 75 #include <sys/stat.h> 76 #include <fcntl.h> 77 #include <linux/err.h> 78 #include <linux/string.h> 79 #include <linux/time64.h> 80 #include <linux/zalloc.h> 81 #include <linux/bitmap.h> 82 #include <sys/time.h> 83 84 struct switch_output { 85 bool enabled; 86 bool signal; 87 unsigned long size; 88 unsigned long time; 89 const char *str; 90 bool set; 91 char **filenames; 92 int num_files; 93 int cur_file; 94 }; 95 96 struct thread_mask { 97 struct mmap_cpu_mask maps; 98 struct mmap_cpu_mask affinity; 99 }; 100 101 struct record_thread { 102 pid_t tid; 103 struct thread_mask *mask; 104 struct { 105 int msg[2]; 106 int ack[2]; 107 } pipes; 108 struct fdarray pollfd; 109 int ctlfd_pos; 110 int nr_mmaps; 111 struct mmap **maps; 112 struct mmap **overwrite_maps; 113 struct record *rec; 114 unsigned long long samples; 115 unsigned long waking; 116 u64 bytes_written; 117 u64 bytes_transferred; 118 u64 bytes_compressed; 119 }; 120 121 static __thread struct record_thread *thread; 122 123 enum thread_msg { 124 THREAD_MSG__UNDEFINED = 0, 125 THREAD_MSG__READY, 126 THREAD_MSG__MAX, 127 }; 128 129 static const char *thread_msg_tags[THREAD_MSG__MAX] = { 130 "UNDEFINED", "READY" 131 }; 132 133 enum thread_spec { 134 THREAD_SPEC__UNDEFINED = 0, 135 THREAD_SPEC__CPU, 136 THREAD_SPEC__CORE, 137 THREAD_SPEC__PACKAGE, 138 THREAD_SPEC__NUMA, 139 THREAD_SPEC__USER, 140 THREAD_SPEC__MAX, 141 }; 142 143 static const char *thread_spec_tags[THREAD_SPEC__MAX] = { 144 "undefined", "cpu", "core", "package", "numa", "user" 145 }; 146 147 struct pollfd_index_map { 148 int evlist_pollfd_index; 149 int thread_pollfd_index; 150 }; 151 152 struct record { 153 struct perf_tool tool; 154 struct record_opts opts; 155 u64 bytes_written; 156 u64 thread_bytes_written; 157 struct perf_data data; 158 struct auxtrace_record *itr; 159 struct evlist *evlist; 160 struct perf_session *session; 161 struct evlist *sb_evlist; 162 pthread_t thread_id; 163 int realtime_prio; 164 bool switch_output_event_set; 165 bool no_buildid; 166 bool no_buildid_set; 167 bool no_buildid_cache; 168 bool no_buildid_cache_set; 169 bool buildid_all; 170 bool buildid_mmap; 171 bool timestamp_filename; 172 bool timestamp_boundary; 173 bool off_cpu; 174 struct switch_output switch_output; 175 unsigned long long samples; 176 unsigned long output_max_size; /* = 0: unlimited */ 177 struct perf_debuginfod debuginfod; 178 int nr_threads; 179 struct thread_mask *thread_masks; 180 struct record_thread *thread_data; 181 struct pollfd_index_map *index_map; 182 size_t index_map_sz; 183 size_t index_map_cnt; 184 }; 185 186 static volatile int done; 187 188 static volatile int auxtrace_record__snapshot_started; 189 static DEFINE_TRIGGER(auxtrace_snapshot_trigger); 190 static DEFINE_TRIGGER(switch_output_trigger); 191 192 static const char *affinity_tags[PERF_AFFINITY_MAX] = { 193 "SYS", "NODE", "CPU" 194 }; 195 196 #ifndef HAVE_GETTID 197 static inline pid_t gettid(void) 198 { 199 return (pid_t)syscall(__NR_gettid); 200 } 201 #endif 202 203 static int record__threads_enabled(struct record *rec) 204 { 205 return rec->opts.threads_spec; 206 } 207 208 static bool switch_output_signal(struct record *rec) 209 { 210 return rec->switch_output.signal && 211 trigger_is_ready(&switch_output_trigger); 212 } 213 214 static bool switch_output_size(struct record *rec) 215 { 216 return rec->switch_output.size && 217 trigger_is_ready(&switch_output_trigger) && 218 (rec->bytes_written >= rec->switch_output.size); 219 } 220 221 static bool switch_output_time(struct record *rec) 222 { 223 return rec->switch_output.time && 224 trigger_is_ready(&switch_output_trigger); 225 } 226 227 static u64 record__bytes_written(struct record *rec) 228 { 229 return rec->bytes_written + rec->thread_bytes_written; 230 } 231 232 static bool record__output_max_size_exceeded(struct record *rec) 233 { 234 return rec->output_max_size && 235 (record__bytes_written(rec) >= rec->output_max_size); 236 } 237 238 static int record__write(struct record *rec, struct mmap *map __maybe_unused, 239 void *bf, size_t size) 240 { 241 struct perf_data_file *file = &rec->session->data->file; 242 243 if (map && map->file) 244 file = map->file; 245 246 if (perf_data_file__write(file, bf, size) < 0) { 247 pr_err("failed to write perf data, error: %m\n"); 248 return -1; 249 } 250 251 if (map && map->file) { 252 thread->bytes_written += size; 253 rec->thread_bytes_written += size; 254 } else { 255 rec->bytes_written += size; 256 } 257 258 if (record__output_max_size_exceeded(rec) && !done) { 259 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB)," 260 " stopping session ]\n", 261 record__bytes_written(rec) >> 10); 262 done = 1; 263 } 264 265 if (switch_output_size(rec)) 266 trigger_hit(&switch_output_trigger); 267 268 return 0; 269 } 270 271 static int record__aio_enabled(struct record *rec); 272 static int record__comp_enabled(struct record *rec); 273 static ssize_t zstd_compress(struct perf_session *session, struct mmap *map, 274 void *dst, size_t dst_size, void *src, size_t src_size); 275 276 #ifdef HAVE_AIO_SUPPORT 277 static int record__aio_write(struct aiocb *cblock, int trace_fd, 278 void *buf, size_t size, off_t off) 279 { 280 int rc; 281 282 cblock->aio_fildes = trace_fd; 283 cblock->aio_buf = buf; 284 cblock->aio_nbytes = size; 285 cblock->aio_offset = off; 286 cblock->aio_sigevent.sigev_notify = SIGEV_NONE; 287 288 do { 289 rc = aio_write(cblock); 290 if (rc == 0) { 291 break; 292 } else if (errno != EAGAIN) { 293 cblock->aio_fildes = -1; 294 pr_err("failed to queue perf data, error: %m\n"); 295 break; 296 } 297 } while (1); 298 299 return rc; 300 } 301 302 static int record__aio_complete(struct mmap *md, struct aiocb *cblock) 303 { 304 void *rem_buf; 305 off_t rem_off; 306 size_t rem_size; 307 int rc, aio_errno; 308 ssize_t aio_ret, written; 309 310 aio_errno = aio_error(cblock); 311 if (aio_errno == EINPROGRESS) 312 return 0; 313 314 written = aio_ret = aio_return(cblock); 315 if (aio_ret < 0) { 316 if (aio_errno != EINTR) 317 pr_err("failed to write perf data, error: %m\n"); 318 written = 0; 319 } 320 321 rem_size = cblock->aio_nbytes - written; 322 323 if (rem_size == 0) { 324 cblock->aio_fildes = -1; 325 /* 326 * md->refcount is incremented in record__aio_pushfn() for 327 * every aio write request started in record__aio_push() so 328 * decrement it because the request is now complete. 329 */ 330 perf_mmap__put(&md->core); 331 rc = 1; 332 } else { 333 /* 334 * aio write request may require restart with the 335 * reminder if the kernel didn't write whole 336 * chunk at once. 337 */ 338 rem_off = cblock->aio_offset + written; 339 rem_buf = (void *)(cblock->aio_buf + written); 340 record__aio_write(cblock, cblock->aio_fildes, 341 rem_buf, rem_size, rem_off); 342 rc = 0; 343 } 344 345 return rc; 346 } 347 348 static int record__aio_sync(struct mmap *md, bool sync_all) 349 { 350 struct aiocb **aiocb = md->aio.aiocb; 351 struct aiocb *cblocks = md->aio.cblocks; 352 struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */ 353 int i, do_suspend; 354 355 do { 356 do_suspend = 0; 357 for (i = 0; i < md->aio.nr_cblocks; ++i) { 358 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) { 359 if (sync_all) 360 aiocb[i] = NULL; 361 else 362 return i; 363 } else { 364 /* 365 * Started aio write is not complete yet 366 * so it has to be waited before the 367 * next allocation. 368 */ 369 aiocb[i] = &cblocks[i]; 370 do_suspend = 1; 371 } 372 } 373 if (!do_suspend) 374 return -1; 375 376 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) { 377 if (!(errno == EAGAIN || errno == EINTR)) 378 pr_err("failed to sync perf data, error: %m\n"); 379 } 380 } while (1); 381 } 382 383 struct record_aio { 384 struct record *rec; 385 void *data; 386 size_t size; 387 }; 388 389 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size) 390 { 391 struct record_aio *aio = to; 392 393 /* 394 * map->core.base data pointed by buf is copied into free map->aio.data[] buffer 395 * to release space in the kernel buffer as fast as possible, calling 396 * perf_mmap__consume() from perf_mmap__push() function. 397 * 398 * That lets the kernel to proceed with storing more profiling data into 399 * the kernel buffer earlier than other per-cpu kernel buffers are handled. 400 * 401 * Coping can be done in two steps in case the chunk of profiling data 402 * crosses the upper bound of the kernel buffer. In this case we first move 403 * part of data from map->start till the upper bound and then the reminder 404 * from the beginning of the kernel buffer till the end of the data chunk. 405 */ 406 407 if (record__comp_enabled(aio->rec)) { 408 ssize_t compressed = zstd_compress(aio->rec->session, NULL, aio->data + aio->size, 409 mmap__mmap_len(map) - aio->size, 410 buf, size); 411 if (compressed < 0) 412 return (int)compressed; 413 414 size = compressed; 415 } else { 416 memcpy(aio->data + aio->size, buf, size); 417 } 418 419 if (!aio->size) { 420 /* 421 * Increment map->refcount to guard map->aio.data[] buffer 422 * from premature deallocation because map object can be 423 * released earlier than aio write request started on 424 * map->aio.data[] buffer is complete. 425 * 426 * perf_mmap__put() is done at record__aio_complete() 427 * after started aio request completion or at record__aio_push() 428 * if the request failed to start. 429 */ 430 perf_mmap__get(&map->core); 431 } 432 433 aio->size += size; 434 435 return size; 436 } 437 438 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off) 439 { 440 int ret, idx; 441 int trace_fd = rec->session->data->file.fd; 442 struct record_aio aio = { .rec = rec, .size = 0 }; 443 444 /* 445 * Call record__aio_sync() to wait till map->aio.data[] buffer 446 * becomes available after previous aio write operation. 447 */ 448 449 idx = record__aio_sync(map, false); 450 aio.data = map->aio.data[idx]; 451 ret = perf_mmap__push(map, &aio, record__aio_pushfn); 452 if (ret != 0) /* ret > 0 - no data, ret < 0 - error */ 453 return ret; 454 455 rec->samples++; 456 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off); 457 if (!ret) { 458 *off += aio.size; 459 rec->bytes_written += aio.size; 460 if (switch_output_size(rec)) 461 trigger_hit(&switch_output_trigger); 462 } else { 463 /* 464 * Decrement map->refcount incremented in record__aio_pushfn() 465 * back if record__aio_write() operation failed to start, otherwise 466 * map->refcount is decremented in record__aio_complete() after 467 * aio write operation finishes successfully. 468 */ 469 perf_mmap__put(&map->core); 470 } 471 472 return ret; 473 } 474 475 static off_t record__aio_get_pos(int trace_fd) 476 { 477 return lseek(trace_fd, 0, SEEK_CUR); 478 } 479 480 static void record__aio_set_pos(int trace_fd, off_t pos) 481 { 482 lseek(trace_fd, pos, SEEK_SET); 483 } 484 485 static void record__aio_mmap_read_sync(struct record *rec) 486 { 487 int i; 488 struct evlist *evlist = rec->evlist; 489 struct mmap *maps = evlist->mmap; 490 491 if (!record__aio_enabled(rec)) 492 return; 493 494 for (i = 0; i < evlist->core.nr_mmaps; i++) { 495 struct mmap *map = &maps[i]; 496 497 if (map->core.base) 498 record__aio_sync(map, true); 499 } 500 } 501 502 static int nr_cblocks_default = 1; 503 static int nr_cblocks_max = 4; 504 505 static int record__aio_parse(const struct option *opt, 506 const char *str, 507 int unset) 508 { 509 struct record_opts *opts = (struct record_opts *)opt->value; 510 511 if (unset) { 512 opts->nr_cblocks = 0; 513 } else { 514 if (str) 515 opts->nr_cblocks = strtol(str, NULL, 0); 516 if (!opts->nr_cblocks) 517 opts->nr_cblocks = nr_cblocks_default; 518 } 519 520 return 0; 521 } 522 #else /* HAVE_AIO_SUPPORT */ 523 static int nr_cblocks_max = 0; 524 525 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused, 526 off_t *off __maybe_unused) 527 { 528 return -1; 529 } 530 531 static off_t record__aio_get_pos(int trace_fd __maybe_unused) 532 { 533 return -1; 534 } 535 536 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused) 537 { 538 } 539 540 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused) 541 { 542 } 543 #endif 544 545 static int record__aio_enabled(struct record *rec) 546 { 547 return rec->opts.nr_cblocks > 0; 548 } 549 550 #define MMAP_FLUSH_DEFAULT 1 551 static int record__mmap_flush_parse(const struct option *opt, 552 const char *str, 553 int unset) 554 { 555 int flush_max; 556 struct record_opts *opts = (struct record_opts *)opt->value; 557 static struct parse_tag tags[] = { 558 { .tag = 'B', .mult = 1 }, 559 { .tag = 'K', .mult = 1 << 10 }, 560 { .tag = 'M', .mult = 1 << 20 }, 561 { .tag = 'G', .mult = 1 << 30 }, 562 { .tag = 0 }, 563 }; 564 565 if (unset) 566 return 0; 567 568 if (str) { 569 opts->mmap_flush = parse_tag_value(str, tags); 570 if (opts->mmap_flush == (int)-1) 571 opts->mmap_flush = strtol(str, NULL, 0); 572 } 573 574 if (!opts->mmap_flush) 575 opts->mmap_flush = MMAP_FLUSH_DEFAULT; 576 577 flush_max = evlist__mmap_size(opts->mmap_pages); 578 flush_max /= 4; 579 if (opts->mmap_flush > flush_max) 580 opts->mmap_flush = flush_max; 581 582 return 0; 583 } 584 585 #ifdef HAVE_ZSTD_SUPPORT 586 static unsigned int comp_level_default = 1; 587 588 static int record__parse_comp_level(const struct option *opt, const char *str, int unset) 589 { 590 struct record_opts *opts = opt->value; 591 592 if (unset) { 593 opts->comp_level = 0; 594 } else { 595 if (str) 596 opts->comp_level = strtol(str, NULL, 0); 597 if (!opts->comp_level) 598 opts->comp_level = comp_level_default; 599 } 600 601 return 0; 602 } 603 #endif 604 static unsigned int comp_level_max = 22; 605 606 static int record__comp_enabled(struct record *rec) 607 { 608 return rec->opts.comp_level > 0; 609 } 610 611 static int process_synthesized_event(struct perf_tool *tool, 612 union perf_event *event, 613 struct perf_sample *sample __maybe_unused, 614 struct machine *machine __maybe_unused) 615 { 616 struct record *rec = container_of(tool, struct record, tool); 617 return record__write(rec, NULL, event, event->header.size); 618 } 619 620 static struct mutex synth_lock; 621 622 static int process_locked_synthesized_event(struct perf_tool *tool, 623 union perf_event *event, 624 struct perf_sample *sample __maybe_unused, 625 struct machine *machine __maybe_unused) 626 { 627 int ret; 628 629 mutex_lock(&synth_lock); 630 ret = process_synthesized_event(tool, event, sample, machine); 631 mutex_unlock(&synth_lock); 632 return ret; 633 } 634 635 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size) 636 { 637 struct record *rec = to; 638 639 if (record__comp_enabled(rec)) { 640 ssize_t compressed = zstd_compress(rec->session, map, map->data, 641 mmap__mmap_len(map), bf, size); 642 643 if (compressed < 0) 644 return (int)compressed; 645 646 size = compressed; 647 bf = map->data; 648 } 649 650 thread->samples++; 651 return record__write(rec, map, bf, size); 652 } 653 654 static volatile sig_atomic_t signr = -1; 655 static volatile sig_atomic_t child_finished; 656 #ifdef HAVE_EVENTFD_SUPPORT 657 static volatile sig_atomic_t done_fd = -1; 658 #endif 659 660 static void sig_handler(int sig) 661 { 662 if (sig == SIGCHLD) 663 child_finished = 1; 664 else 665 signr = sig; 666 667 done = 1; 668 #ifdef HAVE_EVENTFD_SUPPORT 669 if (done_fd >= 0) { 670 u64 tmp = 1; 671 int orig_errno = errno; 672 673 /* 674 * It is possible for this signal handler to run after done is 675 * checked in the main loop, but before the perf counter fds are 676 * polled. If this happens, the poll() will continue to wait 677 * even though done is set, and will only break out if either 678 * another signal is received, or the counters are ready for 679 * read. To ensure the poll() doesn't sleep when done is set, 680 * use an eventfd (done_fd) to wake up the poll(). 681 */ 682 if (write(done_fd, &tmp, sizeof(tmp)) < 0) 683 pr_err("failed to signal wakeup fd, error: %m\n"); 684 685 errno = orig_errno; 686 } 687 #endif // HAVE_EVENTFD_SUPPORT 688 } 689 690 static void sigsegv_handler(int sig) 691 { 692 perf_hooks__recover(); 693 sighandler_dump_stack(sig); 694 } 695 696 static void record__sig_exit(void) 697 { 698 if (signr == -1) 699 return; 700 701 signal(signr, SIG_DFL); 702 raise(signr); 703 } 704 705 #ifdef HAVE_AUXTRACE_SUPPORT 706 707 static int record__process_auxtrace(struct perf_tool *tool, 708 struct mmap *map, 709 union perf_event *event, void *data1, 710 size_t len1, void *data2, size_t len2) 711 { 712 struct record *rec = container_of(tool, struct record, tool); 713 struct perf_data *data = &rec->data; 714 size_t padding; 715 u8 pad[8] = {0}; 716 717 if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) { 718 off_t file_offset; 719 int fd = perf_data__fd(data); 720 int err; 721 722 file_offset = lseek(fd, 0, SEEK_CUR); 723 if (file_offset == -1) 724 return -1; 725 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index, 726 event, file_offset); 727 if (err) 728 return err; 729 } 730 731 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */ 732 padding = (len1 + len2) & 7; 733 if (padding) 734 padding = 8 - padding; 735 736 record__write(rec, map, event, event->header.size); 737 record__write(rec, map, data1, len1); 738 if (len2) 739 record__write(rec, map, data2, len2); 740 record__write(rec, map, &pad, padding); 741 742 return 0; 743 } 744 745 static int record__auxtrace_mmap_read(struct record *rec, 746 struct mmap *map) 747 { 748 int ret; 749 750 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool, 751 record__process_auxtrace); 752 if (ret < 0) 753 return ret; 754 755 if (ret) 756 rec->samples++; 757 758 return 0; 759 } 760 761 static int record__auxtrace_mmap_read_snapshot(struct record *rec, 762 struct mmap *map) 763 { 764 int ret; 765 766 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool, 767 record__process_auxtrace, 768 rec->opts.auxtrace_snapshot_size); 769 if (ret < 0) 770 return ret; 771 772 if (ret) 773 rec->samples++; 774 775 return 0; 776 } 777 778 static int record__auxtrace_read_snapshot_all(struct record *rec) 779 { 780 int i; 781 int rc = 0; 782 783 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) { 784 struct mmap *map = &rec->evlist->mmap[i]; 785 786 if (!map->auxtrace_mmap.base) 787 continue; 788 789 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) { 790 rc = -1; 791 goto out; 792 } 793 } 794 out: 795 return rc; 796 } 797 798 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit) 799 { 800 pr_debug("Recording AUX area tracing snapshot\n"); 801 if (record__auxtrace_read_snapshot_all(rec) < 0) { 802 trigger_error(&auxtrace_snapshot_trigger); 803 } else { 804 if (auxtrace_record__snapshot_finish(rec->itr, on_exit)) 805 trigger_error(&auxtrace_snapshot_trigger); 806 else 807 trigger_ready(&auxtrace_snapshot_trigger); 808 } 809 } 810 811 static int record__auxtrace_snapshot_exit(struct record *rec) 812 { 813 if (trigger_is_error(&auxtrace_snapshot_trigger)) 814 return 0; 815 816 if (!auxtrace_record__snapshot_started && 817 auxtrace_record__snapshot_start(rec->itr)) 818 return -1; 819 820 record__read_auxtrace_snapshot(rec, true); 821 if (trigger_is_error(&auxtrace_snapshot_trigger)) 822 return -1; 823 824 return 0; 825 } 826 827 static int record__auxtrace_init(struct record *rec) 828 { 829 int err; 830 831 if ((rec->opts.auxtrace_snapshot_opts || rec->opts.auxtrace_sample_opts) 832 && record__threads_enabled(rec)) { 833 pr_err("AUX area tracing options are not available in parallel streaming mode.\n"); 834 return -EINVAL; 835 } 836 837 if (!rec->itr) { 838 rec->itr = auxtrace_record__init(rec->evlist, &err); 839 if (err) 840 return err; 841 } 842 843 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts, 844 rec->opts.auxtrace_snapshot_opts); 845 if (err) 846 return err; 847 848 err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts, 849 rec->opts.auxtrace_sample_opts); 850 if (err) 851 return err; 852 853 auxtrace_regroup_aux_output(rec->evlist); 854 855 return auxtrace_parse_filters(rec->evlist); 856 } 857 858 #else 859 860 static inline 861 int record__auxtrace_mmap_read(struct record *rec __maybe_unused, 862 struct mmap *map __maybe_unused) 863 { 864 return 0; 865 } 866 867 static inline 868 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused, 869 bool on_exit __maybe_unused) 870 { 871 } 872 873 static inline 874 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused) 875 { 876 return 0; 877 } 878 879 static inline 880 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused) 881 { 882 return 0; 883 } 884 885 static int record__auxtrace_init(struct record *rec __maybe_unused) 886 { 887 return 0; 888 } 889 890 #endif 891 892 static int record__config_text_poke(struct evlist *evlist) 893 { 894 struct evsel *evsel; 895 896 /* Nothing to do if text poke is already configured */ 897 evlist__for_each_entry(evlist, evsel) { 898 if (evsel->core.attr.text_poke) 899 return 0; 900 } 901 902 evsel = evlist__add_dummy_on_all_cpus(evlist); 903 if (!evsel) 904 return -ENOMEM; 905 906 evsel->core.attr.text_poke = 1; 907 evsel->core.attr.ksymbol = 1; 908 evsel->immediate = true; 909 evsel__set_sample_bit(evsel, TIME); 910 911 return 0; 912 } 913 914 static int record__config_off_cpu(struct record *rec) 915 { 916 return off_cpu_prepare(rec->evlist, &rec->opts.target, &rec->opts); 917 } 918 919 static bool record__tracking_system_wide(struct record *rec) 920 { 921 struct evlist *evlist = rec->evlist; 922 struct evsel *evsel; 923 924 /* 925 * If non-dummy evsel exists, system_wide sideband is need to 926 * help parse sample information. 927 * For example, PERF_EVENT_MMAP event to help parse symbol, 928 * and PERF_EVENT_COMM event to help parse task executable name. 929 */ 930 evlist__for_each_entry(evlist, evsel) { 931 if (!evsel__is_dummy_event(evsel)) 932 return true; 933 } 934 935 return false; 936 } 937 938 static int record__config_tracking_events(struct record *rec) 939 { 940 struct record_opts *opts = &rec->opts; 941 struct evlist *evlist = rec->evlist; 942 bool system_wide = false; 943 struct evsel *evsel; 944 945 /* 946 * For initial_delay, system wide or a hybrid system, we need to add 947 * tracking event so that we can track PERF_RECORD_MMAP to cover the 948 * delay of waiting or event synthesis. 949 */ 950 if (opts->target.initial_delay || target__has_cpu(&opts->target) || 951 perf_pmus__num_core_pmus() > 1) { 952 953 /* 954 * User space tasks can migrate between CPUs, so when tracing 955 * selected CPUs, sideband for all CPUs is still needed. 956 */ 957 if (!!opts->target.cpu_list && record__tracking_system_wide(rec)) 958 system_wide = true; 959 960 evsel = evlist__findnew_tracking_event(evlist, system_wide); 961 if (!evsel) 962 return -ENOMEM; 963 964 /* 965 * Enable the tracking event when the process is forked for 966 * initial_delay, immediately for system wide. 967 */ 968 if (opts->target.initial_delay && !evsel->immediate && 969 !target__has_cpu(&opts->target)) 970 evsel->core.attr.enable_on_exec = 1; 971 else 972 evsel->immediate = 1; 973 } 974 975 return 0; 976 } 977 978 static bool record__kcore_readable(struct machine *machine) 979 { 980 char kcore[PATH_MAX]; 981 int fd; 982 983 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir); 984 985 fd = open(kcore, O_RDONLY); 986 if (fd < 0) 987 return false; 988 989 close(fd); 990 991 return true; 992 } 993 994 static int record__kcore_copy(struct machine *machine, struct perf_data *data) 995 { 996 char from_dir[PATH_MAX]; 997 char kcore_dir[PATH_MAX]; 998 int ret; 999 1000 snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir); 1001 1002 ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir)); 1003 if (ret) 1004 return ret; 1005 1006 return kcore_copy(from_dir, kcore_dir); 1007 } 1008 1009 static void record__thread_data_init_pipes(struct record_thread *thread_data) 1010 { 1011 thread_data->pipes.msg[0] = -1; 1012 thread_data->pipes.msg[1] = -1; 1013 thread_data->pipes.ack[0] = -1; 1014 thread_data->pipes.ack[1] = -1; 1015 } 1016 1017 static int record__thread_data_open_pipes(struct record_thread *thread_data) 1018 { 1019 if (pipe(thread_data->pipes.msg)) 1020 return -EINVAL; 1021 1022 if (pipe(thread_data->pipes.ack)) { 1023 close(thread_data->pipes.msg[0]); 1024 thread_data->pipes.msg[0] = -1; 1025 close(thread_data->pipes.msg[1]); 1026 thread_data->pipes.msg[1] = -1; 1027 return -EINVAL; 1028 } 1029 1030 pr_debug2("thread_data[%p]: msg=[%d,%d], ack=[%d,%d]\n", thread_data, 1031 thread_data->pipes.msg[0], thread_data->pipes.msg[1], 1032 thread_data->pipes.ack[0], thread_data->pipes.ack[1]); 1033 1034 return 0; 1035 } 1036 1037 static void record__thread_data_close_pipes(struct record_thread *thread_data) 1038 { 1039 if (thread_data->pipes.msg[0] != -1) { 1040 close(thread_data->pipes.msg[0]); 1041 thread_data->pipes.msg[0] = -1; 1042 } 1043 if (thread_data->pipes.msg[1] != -1) { 1044 close(thread_data->pipes.msg[1]); 1045 thread_data->pipes.msg[1] = -1; 1046 } 1047 if (thread_data->pipes.ack[0] != -1) { 1048 close(thread_data->pipes.ack[0]); 1049 thread_data->pipes.ack[0] = -1; 1050 } 1051 if (thread_data->pipes.ack[1] != -1) { 1052 close(thread_data->pipes.ack[1]); 1053 thread_data->pipes.ack[1] = -1; 1054 } 1055 } 1056 1057 static bool evlist__per_thread(struct evlist *evlist) 1058 { 1059 return cpu_map__is_dummy(evlist->core.user_requested_cpus); 1060 } 1061 1062 static int record__thread_data_init_maps(struct record_thread *thread_data, struct evlist *evlist) 1063 { 1064 int m, tm, nr_mmaps = evlist->core.nr_mmaps; 1065 struct mmap *mmap = evlist->mmap; 1066 struct mmap *overwrite_mmap = evlist->overwrite_mmap; 1067 struct perf_cpu_map *cpus = evlist->core.all_cpus; 1068 bool per_thread = evlist__per_thread(evlist); 1069 1070 if (per_thread) 1071 thread_data->nr_mmaps = nr_mmaps; 1072 else 1073 thread_data->nr_mmaps = bitmap_weight(thread_data->mask->maps.bits, 1074 thread_data->mask->maps.nbits); 1075 if (mmap) { 1076 thread_data->maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *)); 1077 if (!thread_data->maps) 1078 return -ENOMEM; 1079 } 1080 if (overwrite_mmap) { 1081 thread_data->overwrite_maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *)); 1082 if (!thread_data->overwrite_maps) { 1083 zfree(&thread_data->maps); 1084 return -ENOMEM; 1085 } 1086 } 1087 pr_debug2("thread_data[%p]: nr_mmaps=%d, maps=%p, ow_maps=%p\n", thread_data, 1088 thread_data->nr_mmaps, thread_data->maps, thread_data->overwrite_maps); 1089 1090 for (m = 0, tm = 0; m < nr_mmaps && tm < thread_data->nr_mmaps; m++) { 1091 if (per_thread || 1092 test_bit(perf_cpu_map__cpu(cpus, m).cpu, thread_data->mask->maps.bits)) { 1093 if (thread_data->maps) { 1094 thread_data->maps[tm] = &mmap[m]; 1095 pr_debug2("thread_data[%p]: cpu%d: maps[%d] -> mmap[%d]\n", 1096 thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m); 1097 } 1098 if (thread_data->overwrite_maps) { 1099 thread_data->overwrite_maps[tm] = &overwrite_mmap[m]; 1100 pr_debug2("thread_data[%p]: cpu%d: ow_maps[%d] -> ow_mmap[%d]\n", 1101 thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m); 1102 } 1103 tm++; 1104 } 1105 } 1106 1107 return 0; 1108 } 1109 1110 static int record__thread_data_init_pollfd(struct record_thread *thread_data, struct evlist *evlist) 1111 { 1112 int f, tm, pos; 1113 struct mmap *map, *overwrite_map; 1114 1115 fdarray__init(&thread_data->pollfd, 64); 1116 1117 for (tm = 0; tm < thread_data->nr_mmaps; tm++) { 1118 map = thread_data->maps ? thread_data->maps[tm] : NULL; 1119 overwrite_map = thread_data->overwrite_maps ? 1120 thread_data->overwrite_maps[tm] : NULL; 1121 1122 for (f = 0; f < evlist->core.pollfd.nr; f++) { 1123 void *ptr = evlist->core.pollfd.priv[f].ptr; 1124 1125 if ((map && ptr == map) || (overwrite_map && ptr == overwrite_map)) { 1126 pos = fdarray__dup_entry_from(&thread_data->pollfd, f, 1127 &evlist->core.pollfd); 1128 if (pos < 0) 1129 return pos; 1130 pr_debug2("thread_data[%p]: pollfd[%d] <- event_fd=%d\n", 1131 thread_data, pos, evlist->core.pollfd.entries[f].fd); 1132 } 1133 } 1134 } 1135 1136 return 0; 1137 } 1138 1139 static void record__free_thread_data(struct record *rec) 1140 { 1141 int t; 1142 struct record_thread *thread_data = rec->thread_data; 1143 1144 if (thread_data == NULL) 1145 return; 1146 1147 for (t = 0; t < rec->nr_threads; t++) { 1148 record__thread_data_close_pipes(&thread_data[t]); 1149 zfree(&thread_data[t].maps); 1150 zfree(&thread_data[t].overwrite_maps); 1151 fdarray__exit(&thread_data[t].pollfd); 1152 } 1153 1154 zfree(&rec->thread_data); 1155 } 1156 1157 static int record__map_thread_evlist_pollfd_indexes(struct record *rec, 1158 int evlist_pollfd_index, 1159 int thread_pollfd_index) 1160 { 1161 size_t x = rec->index_map_cnt; 1162 1163 if (realloc_array_as_needed(rec->index_map, rec->index_map_sz, x, NULL)) 1164 return -ENOMEM; 1165 rec->index_map[x].evlist_pollfd_index = evlist_pollfd_index; 1166 rec->index_map[x].thread_pollfd_index = thread_pollfd_index; 1167 rec->index_map_cnt += 1; 1168 return 0; 1169 } 1170 1171 static int record__update_evlist_pollfd_from_thread(struct record *rec, 1172 struct evlist *evlist, 1173 struct record_thread *thread_data) 1174 { 1175 struct pollfd *e_entries = evlist->core.pollfd.entries; 1176 struct pollfd *t_entries = thread_data->pollfd.entries; 1177 int err = 0; 1178 size_t i; 1179 1180 for (i = 0; i < rec->index_map_cnt; i++) { 1181 int e_pos = rec->index_map[i].evlist_pollfd_index; 1182 int t_pos = rec->index_map[i].thread_pollfd_index; 1183 1184 if (e_entries[e_pos].fd != t_entries[t_pos].fd || 1185 e_entries[e_pos].events != t_entries[t_pos].events) { 1186 pr_err("Thread and evlist pollfd index mismatch\n"); 1187 err = -EINVAL; 1188 continue; 1189 } 1190 e_entries[e_pos].revents = t_entries[t_pos].revents; 1191 } 1192 return err; 1193 } 1194 1195 static int record__dup_non_perf_events(struct record *rec, 1196 struct evlist *evlist, 1197 struct record_thread *thread_data) 1198 { 1199 struct fdarray *fda = &evlist->core.pollfd; 1200 int i, ret; 1201 1202 for (i = 0; i < fda->nr; i++) { 1203 if (!(fda->priv[i].flags & fdarray_flag__non_perf_event)) 1204 continue; 1205 ret = fdarray__dup_entry_from(&thread_data->pollfd, i, fda); 1206 if (ret < 0) { 1207 pr_err("Failed to duplicate descriptor in main thread pollfd\n"); 1208 return ret; 1209 } 1210 pr_debug2("thread_data[%p]: pollfd[%d] <- non_perf_event fd=%d\n", 1211 thread_data, ret, fda->entries[i].fd); 1212 ret = record__map_thread_evlist_pollfd_indexes(rec, i, ret); 1213 if (ret < 0) { 1214 pr_err("Failed to map thread and evlist pollfd indexes\n"); 1215 return ret; 1216 } 1217 } 1218 return 0; 1219 } 1220 1221 static int record__alloc_thread_data(struct record *rec, struct evlist *evlist) 1222 { 1223 int t, ret; 1224 struct record_thread *thread_data; 1225 1226 rec->thread_data = zalloc(rec->nr_threads * sizeof(*(rec->thread_data))); 1227 if (!rec->thread_data) { 1228 pr_err("Failed to allocate thread data\n"); 1229 return -ENOMEM; 1230 } 1231 thread_data = rec->thread_data; 1232 1233 for (t = 0; t < rec->nr_threads; t++) 1234 record__thread_data_init_pipes(&thread_data[t]); 1235 1236 for (t = 0; t < rec->nr_threads; t++) { 1237 thread_data[t].rec = rec; 1238 thread_data[t].mask = &rec->thread_masks[t]; 1239 ret = record__thread_data_init_maps(&thread_data[t], evlist); 1240 if (ret) { 1241 pr_err("Failed to initialize thread[%d] maps\n", t); 1242 goto out_free; 1243 } 1244 ret = record__thread_data_init_pollfd(&thread_data[t], evlist); 1245 if (ret) { 1246 pr_err("Failed to initialize thread[%d] pollfd\n", t); 1247 goto out_free; 1248 } 1249 if (t) { 1250 thread_data[t].tid = -1; 1251 ret = record__thread_data_open_pipes(&thread_data[t]); 1252 if (ret) { 1253 pr_err("Failed to open thread[%d] communication pipes\n", t); 1254 goto out_free; 1255 } 1256 ret = fdarray__add(&thread_data[t].pollfd, thread_data[t].pipes.msg[0], 1257 POLLIN | POLLERR | POLLHUP, fdarray_flag__nonfilterable); 1258 if (ret < 0) { 1259 pr_err("Failed to add descriptor to thread[%d] pollfd\n", t); 1260 goto out_free; 1261 } 1262 thread_data[t].ctlfd_pos = ret; 1263 pr_debug2("thread_data[%p]: pollfd[%d] <- ctl_fd=%d\n", 1264 thread_data, thread_data[t].ctlfd_pos, 1265 thread_data[t].pipes.msg[0]); 1266 } else { 1267 thread_data[t].tid = gettid(); 1268 1269 ret = record__dup_non_perf_events(rec, evlist, &thread_data[t]); 1270 if (ret < 0) 1271 goto out_free; 1272 1273 thread_data[t].ctlfd_pos = -1; /* Not used */ 1274 } 1275 } 1276 1277 return 0; 1278 1279 out_free: 1280 record__free_thread_data(rec); 1281 1282 return ret; 1283 } 1284 1285 static int record__mmap_evlist(struct record *rec, 1286 struct evlist *evlist) 1287 { 1288 int i, ret; 1289 struct record_opts *opts = &rec->opts; 1290 bool auxtrace_overwrite = opts->auxtrace_snapshot_mode || 1291 opts->auxtrace_sample_mode; 1292 char msg[512]; 1293 1294 if (opts->affinity != PERF_AFFINITY_SYS) 1295 cpu__setup_cpunode_map(); 1296 1297 if (evlist__mmap_ex(evlist, opts->mmap_pages, 1298 opts->auxtrace_mmap_pages, 1299 auxtrace_overwrite, 1300 opts->nr_cblocks, opts->affinity, 1301 opts->mmap_flush, opts->comp_level) < 0) { 1302 if (errno == EPERM) { 1303 pr_err("Permission error mapping pages.\n" 1304 "Consider increasing " 1305 "/proc/sys/kernel/perf_event_mlock_kb,\n" 1306 "or try again with a smaller value of -m/--mmap_pages.\n" 1307 "(current value: %u,%u)\n", 1308 opts->mmap_pages, opts->auxtrace_mmap_pages); 1309 return -errno; 1310 } else { 1311 pr_err("failed to mmap with %d (%s)\n", errno, 1312 str_error_r(errno, msg, sizeof(msg))); 1313 if (errno) 1314 return -errno; 1315 else 1316 return -EINVAL; 1317 } 1318 } 1319 1320 if (evlist__initialize_ctlfd(evlist, opts->ctl_fd, opts->ctl_fd_ack)) 1321 return -1; 1322 1323 ret = record__alloc_thread_data(rec, evlist); 1324 if (ret) 1325 return ret; 1326 1327 if (record__threads_enabled(rec)) { 1328 ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps); 1329 if (ret) { 1330 pr_err("Failed to create data directory: %s\n", strerror(-ret)); 1331 return ret; 1332 } 1333 for (i = 0; i < evlist->core.nr_mmaps; i++) { 1334 if (evlist->mmap) 1335 evlist->mmap[i].file = &rec->data.dir.files[i]; 1336 if (evlist->overwrite_mmap) 1337 evlist->overwrite_mmap[i].file = &rec->data.dir.files[i]; 1338 } 1339 } 1340 1341 return 0; 1342 } 1343 1344 static int record__mmap(struct record *rec) 1345 { 1346 return record__mmap_evlist(rec, rec->evlist); 1347 } 1348 1349 static int record__open(struct record *rec) 1350 { 1351 char msg[BUFSIZ]; 1352 struct evsel *pos; 1353 struct evlist *evlist = rec->evlist; 1354 struct perf_session *session = rec->session; 1355 struct record_opts *opts = &rec->opts; 1356 int rc = 0; 1357 1358 evlist__config(evlist, opts, &callchain_param); 1359 1360 evlist__for_each_entry(evlist, pos) { 1361 try_again: 1362 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) { 1363 if (evsel__fallback(pos, &opts->target, errno, msg, sizeof(msg))) { 1364 if (verbose > 0) 1365 ui__warning("%s\n", msg); 1366 goto try_again; 1367 } 1368 if ((errno == EINVAL || errno == EBADF) && 1369 pos->core.leader != &pos->core && 1370 pos->weak_group) { 1371 pos = evlist__reset_weak_group(evlist, pos, true); 1372 goto try_again; 1373 } 1374 rc = -errno; 1375 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg)); 1376 ui__error("%s\n", msg); 1377 goto out; 1378 } 1379 1380 pos->supported = true; 1381 } 1382 1383 if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) { 1384 pr_warning( 1385 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" 1386 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" 1387 "Samples in kernel functions may not be resolved if a suitable vmlinux\n" 1388 "file is not found in the buildid cache or in the vmlinux path.\n\n" 1389 "Samples in kernel modules won't be resolved at all.\n\n" 1390 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n" 1391 "even with a suitable vmlinux or kallsyms file.\n\n"); 1392 } 1393 1394 if (evlist__apply_filters(evlist, &pos)) { 1395 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n", 1396 pos->filter ?: "BPF", evsel__name(pos), errno, 1397 str_error_r(errno, msg, sizeof(msg))); 1398 rc = -1; 1399 goto out; 1400 } 1401 1402 rc = record__mmap(rec); 1403 if (rc) 1404 goto out; 1405 1406 session->evlist = evlist; 1407 perf_session__set_id_hdr_size(session); 1408 out: 1409 return rc; 1410 } 1411 1412 static void set_timestamp_boundary(struct record *rec, u64 sample_time) 1413 { 1414 if (rec->evlist->first_sample_time == 0) 1415 rec->evlist->first_sample_time = sample_time; 1416 1417 if (sample_time) 1418 rec->evlist->last_sample_time = sample_time; 1419 } 1420 1421 static int process_sample_event(struct perf_tool *tool, 1422 union perf_event *event, 1423 struct perf_sample *sample, 1424 struct evsel *evsel, 1425 struct machine *machine) 1426 { 1427 struct record *rec = container_of(tool, struct record, tool); 1428 1429 set_timestamp_boundary(rec, sample->time); 1430 1431 if (rec->buildid_all) 1432 return 0; 1433 1434 rec->samples++; 1435 return build_id__mark_dso_hit(tool, event, sample, evsel, machine); 1436 } 1437 1438 static int process_buildids(struct record *rec) 1439 { 1440 struct perf_session *session = rec->session; 1441 1442 if (perf_data__size(&rec->data) == 0) 1443 return 0; 1444 1445 /* 1446 * During this process, it'll load kernel map and replace the 1447 * dso->long_name to a real pathname it found. In this case 1448 * we prefer the vmlinux path like 1449 * /lib/modules/3.16.4/build/vmlinux 1450 * 1451 * rather than build-id path (in debug directory). 1452 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551 1453 */ 1454 symbol_conf.ignore_vmlinux_buildid = true; 1455 1456 /* 1457 * If --buildid-all is given, it marks all DSO regardless of hits, 1458 * so no need to process samples. But if timestamp_boundary is enabled, 1459 * it still needs to walk on all samples to get the timestamps of 1460 * first/last samples. 1461 */ 1462 if (rec->buildid_all && !rec->timestamp_boundary) 1463 rec->tool.sample = NULL; 1464 1465 return perf_session__process_events(session); 1466 } 1467 1468 static void perf_event__synthesize_guest_os(struct machine *machine, void *data) 1469 { 1470 int err; 1471 struct perf_tool *tool = data; 1472 /* 1473 *As for guest kernel when processing subcommand record&report, 1474 *we arrange module mmap prior to guest kernel mmap and trigger 1475 *a preload dso because default guest module symbols are loaded 1476 *from guest kallsyms instead of /lib/modules/XXX/XXX. This 1477 *method is used to avoid symbol missing when the first addr is 1478 *in module instead of in guest kernel. 1479 */ 1480 err = perf_event__synthesize_modules(tool, process_synthesized_event, 1481 machine); 1482 if (err < 0) 1483 pr_err("Couldn't record guest kernel [%d]'s reference" 1484 " relocation symbol.\n", machine->pid); 1485 1486 /* 1487 * We use _stext for guest kernel because guest kernel's /proc/kallsyms 1488 * have no _text sometimes. 1489 */ 1490 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, 1491 machine); 1492 if (err < 0) 1493 pr_err("Couldn't record guest kernel [%d]'s reference" 1494 " relocation symbol.\n", machine->pid); 1495 } 1496 1497 static struct perf_event_header finished_round_event = { 1498 .size = sizeof(struct perf_event_header), 1499 .type = PERF_RECORD_FINISHED_ROUND, 1500 }; 1501 1502 static struct perf_event_header finished_init_event = { 1503 .size = sizeof(struct perf_event_header), 1504 .type = PERF_RECORD_FINISHED_INIT, 1505 }; 1506 1507 static void record__adjust_affinity(struct record *rec, struct mmap *map) 1508 { 1509 if (rec->opts.affinity != PERF_AFFINITY_SYS && 1510 !bitmap_equal(thread->mask->affinity.bits, map->affinity_mask.bits, 1511 thread->mask->affinity.nbits)) { 1512 bitmap_zero(thread->mask->affinity.bits, thread->mask->affinity.nbits); 1513 bitmap_or(thread->mask->affinity.bits, thread->mask->affinity.bits, 1514 map->affinity_mask.bits, thread->mask->affinity.nbits); 1515 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity), 1516 (cpu_set_t *)thread->mask->affinity.bits); 1517 if (verbose == 2) { 1518 pr_debug("threads[%d]: running on cpu%d: ", thread->tid, sched_getcpu()); 1519 mmap_cpu_mask__scnprintf(&thread->mask->affinity, "affinity"); 1520 } 1521 } 1522 } 1523 1524 static size_t process_comp_header(void *record, size_t increment) 1525 { 1526 struct perf_record_compressed *event = record; 1527 size_t size = sizeof(*event); 1528 1529 if (increment) { 1530 event->header.size += increment; 1531 return increment; 1532 } 1533 1534 event->header.type = PERF_RECORD_COMPRESSED; 1535 event->header.size = size; 1536 1537 return size; 1538 } 1539 1540 static ssize_t zstd_compress(struct perf_session *session, struct mmap *map, 1541 void *dst, size_t dst_size, void *src, size_t src_size) 1542 { 1543 ssize_t compressed; 1544 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1; 1545 struct zstd_data *zstd_data = &session->zstd_data; 1546 1547 if (map && map->file) 1548 zstd_data = &map->zstd_data; 1549 1550 compressed = zstd_compress_stream_to_records(zstd_data, dst, dst_size, src, src_size, 1551 max_record_size, process_comp_header); 1552 if (compressed < 0) 1553 return compressed; 1554 1555 if (map && map->file) { 1556 thread->bytes_transferred += src_size; 1557 thread->bytes_compressed += compressed; 1558 } else { 1559 session->bytes_transferred += src_size; 1560 session->bytes_compressed += compressed; 1561 } 1562 1563 return compressed; 1564 } 1565 1566 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist, 1567 bool overwrite, bool synch) 1568 { 1569 u64 bytes_written = rec->bytes_written; 1570 int i; 1571 int rc = 0; 1572 int nr_mmaps; 1573 struct mmap **maps; 1574 int trace_fd = rec->data.file.fd; 1575 off_t off = 0; 1576 1577 if (!evlist) 1578 return 0; 1579 1580 nr_mmaps = thread->nr_mmaps; 1581 maps = overwrite ? thread->overwrite_maps : thread->maps; 1582 1583 if (!maps) 1584 return 0; 1585 1586 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING) 1587 return 0; 1588 1589 if (record__aio_enabled(rec)) 1590 off = record__aio_get_pos(trace_fd); 1591 1592 for (i = 0; i < nr_mmaps; i++) { 1593 u64 flush = 0; 1594 struct mmap *map = maps[i]; 1595 1596 if (map->core.base) { 1597 record__adjust_affinity(rec, map); 1598 if (synch) { 1599 flush = map->core.flush; 1600 map->core.flush = 1; 1601 } 1602 if (!record__aio_enabled(rec)) { 1603 if (perf_mmap__push(map, rec, record__pushfn) < 0) { 1604 if (synch) 1605 map->core.flush = flush; 1606 rc = -1; 1607 goto out; 1608 } 1609 } else { 1610 if (record__aio_push(rec, map, &off) < 0) { 1611 record__aio_set_pos(trace_fd, off); 1612 if (synch) 1613 map->core.flush = flush; 1614 rc = -1; 1615 goto out; 1616 } 1617 } 1618 if (synch) 1619 map->core.flush = flush; 1620 } 1621 1622 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode && 1623 !rec->opts.auxtrace_sample_mode && 1624 record__auxtrace_mmap_read(rec, map) != 0) { 1625 rc = -1; 1626 goto out; 1627 } 1628 } 1629 1630 if (record__aio_enabled(rec)) 1631 record__aio_set_pos(trace_fd, off); 1632 1633 /* 1634 * Mark the round finished in case we wrote 1635 * at least one event. 1636 * 1637 * No need for round events in directory mode, 1638 * because per-cpu maps and files have data 1639 * sorted by kernel. 1640 */ 1641 if (!record__threads_enabled(rec) && bytes_written != rec->bytes_written) 1642 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event)); 1643 1644 if (overwrite) 1645 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY); 1646 out: 1647 return rc; 1648 } 1649 1650 static int record__mmap_read_all(struct record *rec, bool synch) 1651 { 1652 int err; 1653 1654 err = record__mmap_read_evlist(rec, rec->evlist, false, synch); 1655 if (err) 1656 return err; 1657 1658 return record__mmap_read_evlist(rec, rec->evlist, true, synch); 1659 } 1660 1661 static void record__thread_munmap_filtered(struct fdarray *fda, int fd, 1662 void *arg __maybe_unused) 1663 { 1664 struct perf_mmap *map = fda->priv[fd].ptr; 1665 1666 if (map) 1667 perf_mmap__put(map); 1668 } 1669 1670 static void *record__thread(void *arg) 1671 { 1672 enum thread_msg msg = THREAD_MSG__READY; 1673 bool terminate = false; 1674 struct fdarray *pollfd; 1675 int err, ctlfd_pos; 1676 1677 thread = arg; 1678 thread->tid = gettid(); 1679 1680 err = write(thread->pipes.ack[1], &msg, sizeof(msg)); 1681 if (err == -1) 1682 pr_warning("threads[%d]: failed to notify on start: %s\n", 1683 thread->tid, strerror(errno)); 1684 1685 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu()); 1686 1687 pollfd = &thread->pollfd; 1688 ctlfd_pos = thread->ctlfd_pos; 1689 1690 for (;;) { 1691 unsigned long long hits = thread->samples; 1692 1693 if (record__mmap_read_all(thread->rec, false) < 0 || terminate) 1694 break; 1695 1696 if (hits == thread->samples) { 1697 1698 err = fdarray__poll(pollfd, -1); 1699 /* 1700 * Propagate error, only if there's any. Ignore positive 1701 * number of returned events and interrupt error. 1702 */ 1703 if (err > 0 || (err < 0 && errno == EINTR)) 1704 err = 0; 1705 thread->waking++; 1706 1707 if (fdarray__filter(pollfd, POLLERR | POLLHUP, 1708 record__thread_munmap_filtered, NULL) == 0) 1709 break; 1710 } 1711 1712 if (pollfd->entries[ctlfd_pos].revents & POLLHUP) { 1713 terminate = true; 1714 close(thread->pipes.msg[0]); 1715 thread->pipes.msg[0] = -1; 1716 pollfd->entries[ctlfd_pos].fd = -1; 1717 pollfd->entries[ctlfd_pos].events = 0; 1718 } 1719 1720 pollfd->entries[ctlfd_pos].revents = 0; 1721 } 1722 record__mmap_read_all(thread->rec, true); 1723 1724 err = write(thread->pipes.ack[1], &msg, sizeof(msg)); 1725 if (err == -1) 1726 pr_warning("threads[%d]: failed to notify on termination: %s\n", 1727 thread->tid, strerror(errno)); 1728 1729 return NULL; 1730 } 1731 1732 static void record__init_features(struct record *rec) 1733 { 1734 struct perf_session *session = rec->session; 1735 int feat; 1736 1737 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++) 1738 perf_header__set_feat(&session->header, feat); 1739 1740 if (rec->no_buildid) 1741 perf_header__clear_feat(&session->header, HEADER_BUILD_ID); 1742 1743 #ifdef HAVE_LIBTRACEEVENT 1744 if (!have_tracepoints(&rec->evlist->core.entries)) 1745 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA); 1746 #endif 1747 1748 if (!rec->opts.branch_stack) 1749 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK); 1750 1751 if (!rec->opts.full_auxtrace) 1752 perf_header__clear_feat(&session->header, HEADER_AUXTRACE); 1753 1754 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns)) 1755 perf_header__clear_feat(&session->header, HEADER_CLOCKID); 1756 1757 if (!rec->opts.use_clockid) 1758 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA); 1759 1760 if (!record__threads_enabled(rec)) 1761 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT); 1762 1763 if (!record__comp_enabled(rec)) 1764 perf_header__clear_feat(&session->header, HEADER_COMPRESSED); 1765 1766 perf_header__clear_feat(&session->header, HEADER_STAT); 1767 } 1768 1769 static void 1770 record__finish_output(struct record *rec) 1771 { 1772 int i; 1773 struct perf_data *data = &rec->data; 1774 int fd = perf_data__fd(data); 1775 1776 if (data->is_pipe) 1777 return; 1778 1779 rec->session->header.data_size += rec->bytes_written; 1780 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR); 1781 if (record__threads_enabled(rec)) { 1782 for (i = 0; i < data->dir.nr; i++) 1783 data->dir.files[i].size = lseek(data->dir.files[i].fd, 0, SEEK_CUR); 1784 } 1785 1786 if (!rec->no_buildid) { 1787 process_buildids(rec); 1788 1789 if (rec->buildid_all) 1790 dsos__hit_all(rec->session); 1791 } 1792 perf_session__write_header(rec->session, rec->evlist, fd, true); 1793 1794 return; 1795 } 1796 1797 static int record__synthesize_workload(struct record *rec, bool tail) 1798 { 1799 int err; 1800 struct perf_thread_map *thread_map; 1801 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP; 1802 1803 if (rec->opts.tail_synthesize != tail) 1804 return 0; 1805 1806 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid); 1807 if (thread_map == NULL) 1808 return -1; 1809 1810 err = perf_event__synthesize_thread_map(&rec->tool, thread_map, 1811 process_synthesized_event, 1812 &rec->session->machines.host, 1813 needs_mmap, 1814 rec->opts.sample_address); 1815 perf_thread_map__put(thread_map); 1816 return err; 1817 } 1818 1819 static int write_finished_init(struct record *rec, bool tail) 1820 { 1821 if (rec->opts.tail_synthesize != tail) 1822 return 0; 1823 1824 return record__write(rec, NULL, &finished_init_event, sizeof(finished_init_event)); 1825 } 1826 1827 static int record__synthesize(struct record *rec, bool tail); 1828 1829 static int 1830 record__switch_output(struct record *rec, bool at_exit) 1831 { 1832 struct perf_data *data = &rec->data; 1833 int fd, err; 1834 char *new_filename; 1835 1836 /* Same Size: "2015122520103046"*/ 1837 char timestamp[] = "InvalidTimestamp"; 1838 1839 record__aio_mmap_read_sync(rec); 1840 1841 write_finished_init(rec, true); 1842 1843 record__synthesize(rec, true); 1844 if (target__none(&rec->opts.target)) 1845 record__synthesize_workload(rec, true); 1846 1847 rec->samples = 0; 1848 record__finish_output(rec); 1849 err = fetch_current_timestamp(timestamp, sizeof(timestamp)); 1850 if (err) { 1851 pr_err("Failed to get current timestamp\n"); 1852 return -EINVAL; 1853 } 1854 1855 fd = perf_data__switch(data, timestamp, 1856 rec->session->header.data_offset, 1857 at_exit, &new_filename); 1858 if (fd >= 0 && !at_exit) { 1859 rec->bytes_written = 0; 1860 rec->session->header.data_size = 0; 1861 } 1862 1863 if (!quiet) 1864 fprintf(stderr, "[ perf record: Dump %s.%s ]\n", 1865 data->path, timestamp); 1866 1867 if (rec->switch_output.num_files) { 1868 int n = rec->switch_output.cur_file + 1; 1869 1870 if (n >= rec->switch_output.num_files) 1871 n = 0; 1872 rec->switch_output.cur_file = n; 1873 if (rec->switch_output.filenames[n]) { 1874 remove(rec->switch_output.filenames[n]); 1875 zfree(&rec->switch_output.filenames[n]); 1876 } 1877 rec->switch_output.filenames[n] = new_filename; 1878 } else { 1879 free(new_filename); 1880 } 1881 1882 /* Output tracking events */ 1883 if (!at_exit) { 1884 record__synthesize(rec, false); 1885 1886 /* 1887 * In 'perf record --switch-output' without -a, 1888 * record__synthesize() in record__switch_output() won't 1889 * generate tracking events because there's no thread_map 1890 * in evlist. Which causes newly created perf.data doesn't 1891 * contain map and comm information. 1892 * Create a fake thread_map and directly call 1893 * perf_event__synthesize_thread_map() for those events. 1894 */ 1895 if (target__none(&rec->opts.target)) 1896 record__synthesize_workload(rec, false); 1897 write_finished_init(rec, false); 1898 } 1899 return fd; 1900 } 1901 1902 static void __record__save_lost_samples(struct record *rec, struct evsel *evsel, 1903 struct perf_record_lost_samples *lost, 1904 int cpu_idx, int thread_idx, u64 lost_count, 1905 u16 misc_flag) 1906 { 1907 struct perf_sample_id *sid; 1908 struct perf_sample sample = {}; 1909 int id_hdr_size; 1910 1911 lost->lost = lost_count; 1912 if (evsel->core.ids) { 1913 sid = xyarray__entry(evsel->core.sample_id, cpu_idx, thread_idx); 1914 sample.id = sid->id; 1915 } 1916 1917 id_hdr_size = perf_event__synthesize_id_sample((void *)(lost + 1), 1918 evsel->core.attr.sample_type, &sample); 1919 lost->header.size = sizeof(*lost) + id_hdr_size; 1920 lost->header.misc = misc_flag; 1921 record__write(rec, NULL, lost, lost->header.size); 1922 } 1923 1924 static void record__read_lost_samples(struct record *rec) 1925 { 1926 struct perf_session *session = rec->session; 1927 struct perf_record_lost_samples *lost = NULL; 1928 struct evsel *evsel; 1929 1930 /* there was an error during record__open */ 1931 if (session->evlist == NULL) 1932 return; 1933 1934 evlist__for_each_entry(session->evlist, evsel) { 1935 struct xyarray *xy = evsel->core.sample_id; 1936 u64 lost_count; 1937 1938 if (xy == NULL || evsel->core.fd == NULL) 1939 continue; 1940 if (xyarray__max_x(evsel->core.fd) != xyarray__max_x(xy) || 1941 xyarray__max_y(evsel->core.fd) != xyarray__max_y(xy)) { 1942 pr_debug("Unmatched FD vs. sample ID: skip reading LOST count\n"); 1943 continue; 1944 } 1945 1946 for (int x = 0; x < xyarray__max_x(xy); x++) { 1947 for (int y = 0; y < xyarray__max_y(xy); y++) { 1948 struct perf_counts_values count; 1949 1950 if (perf_evsel__read(&evsel->core, x, y, &count) < 0) { 1951 pr_debug("read LOST count failed\n"); 1952 goto out; 1953 } 1954 1955 if (count.lost) { 1956 if (!lost) { 1957 lost = zalloc(sizeof(*lost) + 1958 session->machines.host.id_hdr_size); 1959 if (!lost) { 1960 pr_debug("Memory allocation failed\n"); 1961 return; 1962 } 1963 lost->header.type = PERF_RECORD_LOST_SAMPLES; 1964 } 1965 __record__save_lost_samples(rec, evsel, lost, 1966 x, y, count.lost, 0); 1967 } 1968 } 1969 } 1970 1971 lost_count = perf_bpf_filter__lost_count(evsel); 1972 if (lost_count) { 1973 if (!lost) { 1974 lost = zalloc(sizeof(*lost) + 1975 session->machines.host.id_hdr_size); 1976 if (!lost) { 1977 pr_debug("Memory allocation failed\n"); 1978 return; 1979 } 1980 lost->header.type = PERF_RECORD_LOST_SAMPLES; 1981 } 1982 __record__save_lost_samples(rec, evsel, lost, 0, 0, lost_count, 1983 PERF_RECORD_MISC_LOST_SAMPLES_BPF); 1984 } 1985 } 1986 out: 1987 free(lost); 1988 } 1989 1990 static volatile sig_atomic_t workload_exec_errno; 1991 1992 /* 1993 * evlist__prepare_workload will send a SIGUSR1 1994 * if the fork fails, since we asked by setting its 1995 * want_signal to true. 1996 */ 1997 static void workload_exec_failed_signal(int signo __maybe_unused, 1998 siginfo_t *info, 1999 void *ucontext __maybe_unused) 2000 { 2001 workload_exec_errno = info->si_value.sival_int; 2002 done = 1; 2003 child_finished = 1; 2004 } 2005 2006 static void snapshot_sig_handler(int sig); 2007 static void alarm_sig_handler(int sig); 2008 2009 static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist) 2010 { 2011 if (evlist) { 2012 if (evlist->mmap && evlist->mmap[0].core.base) 2013 return evlist->mmap[0].core.base; 2014 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base) 2015 return evlist->overwrite_mmap[0].core.base; 2016 } 2017 return NULL; 2018 } 2019 2020 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec) 2021 { 2022 const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist); 2023 if (pc) 2024 return pc; 2025 return NULL; 2026 } 2027 2028 static int record__synthesize(struct record *rec, bool tail) 2029 { 2030 struct perf_session *session = rec->session; 2031 struct machine *machine = &session->machines.host; 2032 struct perf_data *data = &rec->data; 2033 struct record_opts *opts = &rec->opts; 2034 struct perf_tool *tool = &rec->tool; 2035 int err = 0; 2036 event_op f = process_synthesized_event; 2037 2038 if (rec->opts.tail_synthesize != tail) 2039 return 0; 2040 2041 if (data->is_pipe) { 2042 err = perf_event__synthesize_for_pipe(tool, session, data, 2043 process_synthesized_event); 2044 if (err < 0) 2045 goto out; 2046 2047 rec->bytes_written += err; 2048 } 2049 2050 err = perf_event__synth_time_conv(record__pick_pc(rec), tool, 2051 process_synthesized_event, machine); 2052 if (err) 2053 goto out; 2054 2055 /* Synthesize id_index before auxtrace_info */ 2056 err = perf_event__synthesize_id_index(tool, 2057 process_synthesized_event, 2058 session->evlist, machine); 2059 if (err) 2060 goto out; 2061 2062 if (rec->opts.full_auxtrace) { 2063 err = perf_event__synthesize_auxtrace_info(rec->itr, tool, 2064 session, process_synthesized_event); 2065 if (err) 2066 goto out; 2067 } 2068 2069 if (!evlist__exclude_kernel(rec->evlist)) { 2070 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event, 2071 machine); 2072 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n" 2073 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 2074 "Check /proc/kallsyms permission or run as root.\n"); 2075 2076 err = perf_event__synthesize_modules(tool, process_synthesized_event, 2077 machine); 2078 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n" 2079 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" 2080 "Check /proc/modules permission or run as root.\n"); 2081 } 2082 2083 if (perf_guest) { 2084 machines__process_guests(&session->machines, 2085 perf_event__synthesize_guest_os, tool); 2086 } 2087 2088 err = perf_event__synthesize_extra_attr(&rec->tool, 2089 rec->evlist, 2090 process_synthesized_event, 2091 data->is_pipe); 2092 if (err) 2093 goto out; 2094 2095 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads, 2096 process_synthesized_event, 2097 NULL); 2098 if (err < 0) { 2099 pr_err("Couldn't synthesize thread map.\n"); 2100 return err; 2101 } 2102 2103 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.all_cpus, 2104 process_synthesized_event, NULL); 2105 if (err < 0) { 2106 pr_err("Couldn't synthesize cpu map.\n"); 2107 return err; 2108 } 2109 2110 err = perf_event__synthesize_bpf_events(session, process_synthesized_event, 2111 machine, opts); 2112 if (err < 0) { 2113 pr_warning("Couldn't synthesize bpf events.\n"); 2114 err = 0; 2115 } 2116 2117 if (rec->opts.synth & PERF_SYNTH_CGROUP) { 2118 err = perf_event__synthesize_cgroups(tool, process_synthesized_event, 2119 machine); 2120 if (err < 0) { 2121 pr_warning("Couldn't synthesize cgroup events.\n"); 2122 err = 0; 2123 } 2124 } 2125 2126 if (rec->opts.nr_threads_synthesize > 1) { 2127 mutex_init(&synth_lock); 2128 perf_set_multithreaded(); 2129 f = process_locked_synthesized_event; 2130 } 2131 2132 if (rec->opts.synth & PERF_SYNTH_TASK) { 2133 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP; 2134 2135 err = __machine__synthesize_threads(machine, tool, &opts->target, 2136 rec->evlist->core.threads, 2137 f, needs_mmap, opts->sample_address, 2138 rec->opts.nr_threads_synthesize); 2139 } 2140 2141 if (rec->opts.nr_threads_synthesize > 1) { 2142 perf_set_singlethreaded(); 2143 mutex_destroy(&synth_lock); 2144 } 2145 2146 out: 2147 return err; 2148 } 2149 2150 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data) 2151 { 2152 struct record *rec = data; 2153 pthread_kill(rec->thread_id, SIGUSR2); 2154 return 0; 2155 } 2156 2157 static int record__setup_sb_evlist(struct record *rec) 2158 { 2159 struct record_opts *opts = &rec->opts; 2160 2161 if (rec->sb_evlist != NULL) { 2162 /* 2163 * We get here if --switch-output-event populated the 2164 * sb_evlist, so associate a callback that will send a SIGUSR2 2165 * to the main thread. 2166 */ 2167 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec); 2168 rec->thread_id = pthread_self(); 2169 } 2170 #ifdef HAVE_LIBBPF_SUPPORT 2171 if (!opts->no_bpf_event) { 2172 if (rec->sb_evlist == NULL) { 2173 rec->sb_evlist = evlist__new(); 2174 2175 if (rec->sb_evlist == NULL) { 2176 pr_err("Couldn't create side band evlist.\n."); 2177 return -1; 2178 } 2179 } 2180 2181 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) { 2182 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n."); 2183 return -1; 2184 } 2185 } 2186 #endif 2187 if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) { 2188 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n"); 2189 opts->no_bpf_event = true; 2190 } 2191 2192 return 0; 2193 } 2194 2195 static int record__init_clock(struct record *rec) 2196 { 2197 struct perf_session *session = rec->session; 2198 struct timespec ref_clockid; 2199 struct timeval ref_tod; 2200 u64 ref; 2201 2202 if (!rec->opts.use_clockid) 2203 return 0; 2204 2205 if (rec->opts.use_clockid && rec->opts.clockid_res_ns) 2206 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns; 2207 2208 session->header.env.clock.clockid = rec->opts.clockid; 2209 2210 if (gettimeofday(&ref_tod, NULL) != 0) { 2211 pr_err("gettimeofday failed, cannot set reference time.\n"); 2212 return -1; 2213 } 2214 2215 if (clock_gettime(rec->opts.clockid, &ref_clockid)) { 2216 pr_err("clock_gettime failed, cannot set reference time.\n"); 2217 return -1; 2218 } 2219 2220 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC + 2221 (u64) ref_tod.tv_usec * NSEC_PER_USEC; 2222 2223 session->header.env.clock.tod_ns = ref; 2224 2225 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC + 2226 (u64) ref_clockid.tv_nsec; 2227 2228 session->header.env.clock.clockid_ns = ref; 2229 return 0; 2230 } 2231 2232 static void hit_auxtrace_snapshot_trigger(struct record *rec) 2233 { 2234 if (trigger_is_ready(&auxtrace_snapshot_trigger)) { 2235 trigger_hit(&auxtrace_snapshot_trigger); 2236 auxtrace_record__snapshot_started = 1; 2237 if (auxtrace_record__snapshot_start(rec->itr)) 2238 trigger_error(&auxtrace_snapshot_trigger); 2239 } 2240 } 2241 2242 static int record__terminate_thread(struct record_thread *thread_data) 2243 { 2244 int err; 2245 enum thread_msg ack = THREAD_MSG__UNDEFINED; 2246 pid_t tid = thread_data->tid; 2247 2248 close(thread_data->pipes.msg[1]); 2249 thread_data->pipes.msg[1] = -1; 2250 err = read(thread_data->pipes.ack[0], &ack, sizeof(ack)); 2251 if (err > 0) 2252 pr_debug2("threads[%d]: sent %s\n", tid, thread_msg_tags[ack]); 2253 else 2254 pr_warning("threads[%d]: failed to receive termination notification from %d\n", 2255 thread->tid, tid); 2256 2257 return 0; 2258 } 2259 2260 static int record__start_threads(struct record *rec) 2261 { 2262 int t, tt, err, ret = 0, nr_threads = rec->nr_threads; 2263 struct record_thread *thread_data = rec->thread_data; 2264 sigset_t full, mask; 2265 pthread_t handle; 2266 pthread_attr_t attrs; 2267 2268 thread = &thread_data[0]; 2269 2270 if (!record__threads_enabled(rec)) 2271 return 0; 2272 2273 sigfillset(&full); 2274 if (sigprocmask(SIG_SETMASK, &full, &mask)) { 2275 pr_err("Failed to block signals on threads start: %s\n", strerror(errno)); 2276 return -1; 2277 } 2278 2279 pthread_attr_init(&attrs); 2280 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED); 2281 2282 for (t = 1; t < nr_threads; t++) { 2283 enum thread_msg msg = THREAD_MSG__UNDEFINED; 2284 2285 #ifdef HAVE_PTHREAD_ATTR_SETAFFINITY_NP 2286 pthread_attr_setaffinity_np(&attrs, 2287 MMAP_CPU_MASK_BYTES(&(thread_data[t].mask->affinity)), 2288 (cpu_set_t *)(thread_data[t].mask->affinity.bits)); 2289 #endif 2290 if (pthread_create(&handle, &attrs, record__thread, &thread_data[t])) { 2291 for (tt = 1; tt < t; tt++) 2292 record__terminate_thread(&thread_data[t]); 2293 pr_err("Failed to start threads: %s\n", strerror(errno)); 2294 ret = -1; 2295 goto out_err; 2296 } 2297 2298 err = read(thread_data[t].pipes.ack[0], &msg, sizeof(msg)); 2299 if (err > 0) 2300 pr_debug2("threads[%d]: sent %s\n", rec->thread_data[t].tid, 2301 thread_msg_tags[msg]); 2302 else 2303 pr_warning("threads[%d]: failed to receive start notification from %d\n", 2304 thread->tid, rec->thread_data[t].tid); 2305 } 2306 2307 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity), 2308 (cpu_set_t *)thread->mask->affinity.bits); 2309 2310 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu()); 2311 2312 out_err: 2313 pthread_attr_destroy(&attrs); 2314 2315 if (sigprocmask(SIG_SETMASK, &mask, NULL)) { 2316 pr_err("Failed to unblock signals on threads start: %s\n", strerror(errno)); 2317 ret = -1; 2318 } 2319 2320 return ret; 2321 } 2322 2323 static int record__stop_threads(struct record *rec) 2324 { 2325 int t; 2326 struct record_thread *thread_data = rec->thread_data; 2327 2328 for (t = 1; t < rec->nr_threads; t++) 2329 record__terminate_thread(&thread_data[t]); 2330 2331 for (t = 0; t < rec->nr_threads; t++) { 2332 rec->samples += thread_data[t].samples; 2333 if (!record__threads_enabled(rec)) 2334 continue; 2335 rec->session->bytes_transferred += thread_data[t].bytes_transferred; 2336 rec->session->bytes_compressed += thread_data[t].bytes_compressed; 2337 pr_debug("threads[%d]: samples=%lld, wakes=%ld, ", thread_data[t].tid, 2338 thread_data[t].samples, thread_data[t].waking); 2339 if (thread_data[t].bytes_transferred && thread_data[t].bytes_compressed) 2340 pr_debug("transferred=%" PRIu64 ", compressed=%" PRIu64 "\n", 2341 thread_data[t].bytes_transferred, thread_data[t].bytes_compressed); 2342 else 2343 pr_debug("written=%" PRIu64 "\n", thread_data[t].bytes_written); 2344 } 2345 2346 return 0; 2347 } 2348 2349 static unsigned long record__waking(struct record *rec) 2350 { 2351 int t; 2352 unsigned long waking = 0; 2353 struct record_thread *thread_data = rec->thread_data; 2354 2355 for (t = 0; t < rec->nr_threads; t++) 2356 waking += thread_data[t].waking; 2357 2358 return waking; 2359 } 2360 2361 static int __cmd_record(struct record *rec, int argc, const char **argv) 2362 { 2363 int err; 2364 int status = 0; 2365 const bool forks = argc > 0; 2366 struct perf_tool *tool = &rec->tool; 2367 struct record_opts *opts = &rec->opts; 2368 struct perf_data *data = &rec->data; 2369 struct perf_session *session; 2370 bool disabled = false, draining = false; 2371 int fd; 2372 float ratio = 0; 2373 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED; 2374 2375 atexit(record__sig_exit); 2376 signal(SIGCHLD, sig_handler); 2377 signal(SIGINT, sig_handler); 2378 signal(SIGTERM, sig_handler); 2379 signal(SIGSEGV, sigsegv_handler); 2380 2381 if (rec->opts.record_namespaces) 2382 tool->namespace_events = true; 2383 2384 if (rec->opts.record_cgroup) { 2385 #ifdef HAVE_FILE_HANDLE 2386 tool->cgroup_events = true; 2387 #else 2388 pr_err("cgroup tracking is not supported\n"); 2389 return -1; 2390 #endif 2391 } 2392 2393 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) { 2394 signal(SIGUSR2, snapshot_sig_handler); 2395 if (rec->opts.auxtrace_snapshot_mode) 2396 trigger_on(&auxtrace_snapshot_trigger); 2397 if (rec->switch_output.enabled) 2398 trigger_on(&switch_output_trigger); 2399 } else { 2400 signal(SIGUSR2, SIG_IGN); 2401 } 2402 2403 session = perf_session__new(data, tool); 2404 if (IS_ERR(session)) { 2405 pr_err("Perf session creation failed.\n"); 2406 return PTR_ERR(session); 2407 } 2408 2409 if (record__threads_enabled(rec)) { 2410 if (perf_data__is_pipe(&rec->data)) { 2411 pr_err("Parallel trace streaming is not available in pipe mode.\n"); 2412 return -1; 2413 } 2414 if (rec->opts.full_auxtrace) { 2415 pr_err("Parallel trace streaming is not available in AUX area tracing mode.\n"); 2416 return -1; 2417 } 2418 } 2419 2420 fd = perf_data__fd(data); 2421 rec->session = session; 2422 2423 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) { 2424 pr_err("Compression initialization failed.\n"); 2425 return -1; 2426 } 2427 #ifdef HAVE_EVENTFD_SUPPORT 2428 done_fd = eventfd(0, EFD_NONBLOCK); 2429 if (done_fd < 0) { 2430 pr_err("Failed to create wakeup eventfd, error: %m\n"); 2431 status = -1; 2432 goto out_delete_session; 2433 } 2434 err = evlist__add_wakeup_eventfd(rec->evlist, done_fd); 2435 if (err < 0) { 2436 pr_err("Failed to add wakeup eventfd to poll list\n"); 2437 status = err; 2438 goto out_delete_session; 2439 } 2440 #endif // HAVE_EVENTFD_SUPPORT 2441 2442 session->header.env.comp_type = PERF_COMP_ZSTD; 2443 session->header.env.comp_level = rec->opts.comp_level; 2444 2445 if (rec->opts.kcore && 2446 !record__kcore_readable(&session->machines.host)) { 2447 pr_err("ERROR: kcore is not readable.\n"); 2448 return -1; 2449 } 2450 2451 if (record__init_clock(rec)) 2452 return -1; 2453 2454 record__init_features(rec); 2455 2456 if (forks) { 2457 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe, 2458 workload_exec_failed_signal); 2459 if (err < 0) { 2460 pr_err("Couldn't run the workload!\n"); 2461 status = err; 2462 goto out_delete_session; 2463 } 2464 } 2465 2466 /* 2467 * If we have just single event and are sending data 2468 * through pipe, we need to force the ids allocation, 2469 * because we synthesize event name through the pipe 2470 * and need the id for that. 2471 */ 2472 if (data->is_pipe && rec->evlist->core.nr_entries == 1) 2473 rec->opts.sample_id = true; 2474 2475 evlist__uniquify_name(rec->evlist); 2476 2477 /* Debug message used by test scripts */ 2478 pr_debug3("perf record opening and mmapping events\n"); 2479 if (record__open(rec) != 0) { 2480 err = -1; 2481 goto out_free_threads; 2482 } 2483 /* Debug message used by test scripts */ 2484 pr_debug3("perf record done opening and mmapping events\n"); 2485 session->header.env.comp_mmap_len = session->evlist->core.mmap_len; 2486 2487 if (rec->opts.kcore) { 2488 err = record__kcore_copy(&session->machines.host, data); 2489 if (err) { 2490 pr_err("ERROR: Failed to copy kcore\n"); 2491 goto out_free_threads; 2492 } 2493 } 2494 2495 /* 2496 * Normally perf_session__new would do this, but it doesn't have the 2497 * evlist. 2498 */ 2499 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) { 2500 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n"); 2501 rec->tool.ordered_events = false; 2502 } 2503 2504 if (evlist__nr_groups(rec->evlist) == 0) 2505 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC); 2506 2507 if (data->is_pipe) { 2508 err = perf_header__write_pipe(fd); 2509 if (err < 0) 2510 goto out_free_threads; 2511 } else { 2512 err = perf_session__write_header(session, rec->evlist, fd, false); 2513 if (err < 0) 2514 goto out_free_threads; 2515 } 2516 2517 err = -1; 2518 if (!rec->no_buildid 2519 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) { 2520 pr_err("Couldn't generate buildids. " 2521 "Use --no-buildid to profile anyway.\n"); 2522 goto out_free_threads; 2523 } 2524 2525 err = record__setup_sb_evlist(rec); 2526 if (err) 2527 goto out_free_threads; 2528 2529 err = record__synthesize(rec, false); 2530 if (err < 0) 2531 goto out_free_threads; 2532 2533 if (rec->realtime_prio) { 2534 struct sched_param param; 2535 2536 param.sched_priority = rec->realtime_prio; 2537 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { 2538 pr_err("Could not set realtime priority.\n"); 2539 err = -1; 2540 goto out_free_threads; 2541 } 2542 } 2543 2544 if (record__start_threads(rec)) 2545 goto out_free_threads; 2546 2547 /* 2548 * When perf is starting the traced process, all the events 2549 * (apart from group members) have enable_on_exec=1 set, 2550 * so don't spoil it by prematurely enabling them. 2551 */ 2552 if (!target__none(&opts->target) && !opts->target.initial_delay) 2553 evlist__enable(rec->evlist); 2554 2555 /* 2556 * Let the child rip 2557 */ 2558 if (forks) { 2559 struct machine *machine = &session->machines.host; 2560 union perf_event *event; 2561 pid_t tgid; 2562 2563 event = malloc(sizeof(event->comm) + machine->id_hdr_size); 2564 if (event == NULL) { 2565 err = -ENOMEM; 2566 goto out_child; 2567 } 2568 2569 /* 2570 * Some H/W events are generated before COMM event 2571 * which is emitted during exec(), so perf script 2572 * cannot see a correct process name for those events. 2573 * Synthesize COMM event to prevent it. 2574 */ 2575 tgid = perf_event__synthesize_comm(tool, event, 2576 rec->evlist->workload.pid, 2577 process_synthesized_event, 2578 machine); 2579 free(event); 2580 2581 if (tgid == -1) 2582 goto out_child; 2583 2584 event = malloc(sizeof(event->namespaces) + 2585 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 2586 machine->id_hdr_size); 2587 if (event == NULL) { 2588 err = -ENOMEM; 2589 goto out_child; 2590 } 2591 2592 /* 2593 * Synthesize NAMESPACES event for the command specified. 2594 */ 2595 perf_event__synthesize_namespaces(tool, event, 2596 rec->evlist->workload.pid, 2597 tgid, process_synthesized_event, 2598 machine); 2599 free(event); 2600 2601 evlist__start_workload(rec->evlist); 2602 } 2603 2604 if (opts->target.initial_delay) { 2605 pr_info(EVLIST_DISABLED_MSG); 2606 if (opts->target.initial_delay > 0) { 2607 usleep(opts->target.initial_delay * USEC_PER_MSEC); 2608 evlist__enable(rec->evlist); 2609 pr_info(EVLIST_ENABLED_MSG); 2610 } 2611 } 2612 2613 err = event_enable_timer__start(rec->evlist->eet); 2614 if (err) 2615 goto out_child; 2616 2617 /* Debug message used by test scripts */ 2618 pr_debug3("perf record has started\n"); 2619 fflush(stderr); 2620 2621 trigger_ready(&auxtrace_snapshot_trigger); 2622 trigger_ready(&switch_output_trigger); 2623 perf_hooks__invoke_record_start(); 2624 2625 /* 2626 * Must write FINISHED_INIT so it will be seen after all other 2627 * synthesized user events, but before any regular events. 2628 */ 2629 err = write_finished_init(rec, false); 2630 if (err < 0) 2631 goto out_child; 2632 2633 for (;;) { 2634 unsigned long long hits = thread->samples; 2635 2636 /* 2637 * rec->evlist->bkw_mmap_state is possible to be 2638 * BKW_MMAP_EMPTY here: when done == true and 2639 * hits != rec->samples in previous round. 2640 * 2641 * evlist__toggle_bkw_mmap ensure we never 2642 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING. 2643 */ 2644 if (trigger_is_hit(&switch_output_trigger) || done || draining) 2645 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING); 2646 2647 if (record__mmap_read_all(rec, false) < 0) { 2648 trigger_error(&auxtrace_snapshot_trigger); 2649 trigger_error(&switch_output_trigger); 2650 err = -1; 2651 goto out_child; 2652 } 2653 2654 if (auxtrace_record__snapshot_started) { 2655 auxtrace_record__snapshot_started = 0; 2656 if (!trigger_is_error(&auxtrace_snapshot_trigger)) 2657 record__read_auxtrace_snapshot(rec, false); 2658 if (trigger_is_error(&auxtrace_snapshot_trigger)) { 2659 pr_err("AUX area tracing snapshot failed\n"); 2660 err = -1; 2661 goto out_child; 2662 } 2663 } 2664 2665 if (trigger_is_hit(&switch_output_trigger)) { 2666 /* 2667 * If switch_output_trigger is hit, the data in 2668 * overwritable ring buffer should have been collected, 2669 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY. 2670 * 2671 * If SIGUSR2 raise after or during record__mmap_read_all(), 2672 * record__mmap_read_all() didn't collect data from 2673 * overwritable ring buffer. Read again. 2674 */ 2675 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING) 2676 continue; 2677 trigger_ready(&switch_output_trigger); 2678 2679 /* 2680 * Reenable events in overwrite ring buffer after 2681 * record__mmap_read_all(): we should have collected 2682 * data from it. 2683 */ 2684 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING); 2685 2686 if (!quiet) 2687 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n", 2688 record__waking(rec)); 2689 thread->waking = 0; 2690 fd = record__switch_output(rec, false); 2691 if (fd < 0) { 2692 pr_err("Failed to switch to new file\n"); 2693 trigger_error(&switch_output_trigger); 2694 err = fd; 2695 goto out_child; 2696 } 2697 2698 /* re-arm the alarm */ 2699 if (rec->switch_output.time) 2700 alarm(rec->switch_output.time); 2701 } 2702 2703 if (hits == thread->samples) { 2704 if (done || draining) 2705 break; 2706 err = fdarray__poll(&thread->pollfd, -1); 2707 /* 2708 * Propagate error, only if there's any. Ignore positive 2709 * number of returned events and interrupt error. 2710 */ 2711 if (err > 0 || (err < 0 && errno == EINTR)) 2712 err = 0; 2713 thread->waking++; 2714 2715 if (fdarray__filter(&thread->pollfd, POLLERR | POLLHUP, 2716 record__thread_munmap_filtered, NULL) == 0) 2717 draining = true; 2718 2719 err = record__update_evlist_pollfd_from_thread(rec, rec->evlist, thread); 2720 if (err) 2721 goto out_child; 2722 } 2723 2724 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) { 2725 switch (cmd) { 2726 case EVLIST_CTL_CMD_SNAPSHOT: 2727 hit_auxtrace_snapshot_trigger(rec); 2728 evlist__ctlfd_ack(rec->evlist); 2729 break; 2730 case EVLIST_CTL_CMD_STOP: 2731 done = 1; 2732 break; 2733 case EVLIST_CTL_CMD_ACK: 2734 case EVLIST_CTL_CMD_UNSUPPORTED: 2735 case EVLIST_CTL_CMD_ENABLE: 2736 case EVLIST_CTL_CMD_DISABLE: 2737 case EVLIST_CTL_CMD_EVLIST: 2738 case EVLIST_CTL_CMD_PING: 2739 default: 2740 break; 2741 } 2742 } 2743 2744 err = event_enable_timer__process(rec->evlist->eet); 2745 if (err < 0) 2746 goto out_child; 2747 if (err) { 2748 err = 0; 2749 done = 1; 2750 } 2751 2752 /* 2753 * When perf is starting the traced process, at the end events 2754 * die with the process and we wait for that. Thus no need to 2755 * disable events in this case. 2756 */ 2757 if (done && !disabled && !target__none(&opts->target)) { 2758 trigger_off(&auxtrace_snapshot_trigger); 2759 evlist__disable(rec->evlist); 2760 disabled = true; 2761 } 2762 } 2763 2764 trigger_off(&auxtrace_snapshot_trigger); 2765 trigger_off(&switch_output_trigger); 2766 2767 if (opts->auxtrace_snapshot_on_exit) 2768 record__auxtrace_snapshot_exit(rec); 2769 2770 if (forks && workload_exec_errno) { 2771 char msg[STRERR_BUFSIZE], strevsels[2048]; 2772 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg)); 2773 2774 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels); 2775 2776 pr_err("Failed to collect '%s' for the '%s' workload: %s\n", 2777 strevsels, argv[0], emsg); 2778 err = -1; 2779 goto out_child; 2780 } 2781 2782 if (!quiet) 2783 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", 2784 record__waking(rec)); 2785 2786 write_finished_init(rec, true); 2787 2788 if (target__none(&rec->opts.target)) 2789 record__synthesize_workload(rec, true); 2790 2791 out_child: 2792 record__stop_threads(rec); 2793 record__mmap_read_all(rec, true); 2794 out_free_threads: 2795 record__free_thread_data(rec); 2796 evlist__finalize_ctlfd(rec->evlist); 2797 record__aio_mmap_read_sync(rec); 2798 2799 if (rec->session->bytes_transferred && rec->session->bytes_compressed) { 2800 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed; 2801 session->header.env.comp_ratio = ratio + 0.5; 2802 } 2803 2804 if (forks) { 2805 int exit_status; 2806 2807 if (!child_finished) 2808 kill(rec->evlist->workload.pid, SIGTERM); 2809 2810 wait(&exit_status); 2811 2812 if (err < 0) 2813 status = err; 2814 else if (WIFEXITED(exit_status)) 2815 status = WEXITSTATUS(exit_status); 2816 else if (WIFSIGNALED(exit_status)) 2817 signr = WTERMSIG(exit_status); 2818 } else 2819 status = err; 2820 2821 if (rec->off_cpu) 2822 rec->bytes_written += off_cpu_write(rec->session); 2823 2824 record__read_lost_samples(rec); 2825 record__synthesize(rec, true); 2826 /* this will be recalculated during process_buildids() */ 2827 rec->samples = 0; 2828 2829 if (!err) { 2830 if (!rec->timestamp_filename) { 2831 record__finish_output(rec); 2832 } else { 2833 fd = record__switch_output(rec, true); 2834 if (fd < 0) { 2835 status = fd; 2836 goto out_delete_session; 2837 } 2838 } 2839 } 2840 2841 perf_hooks__invoke_record_end(); 2842 2843 if (!err && !quiet) { 2844 char samples[128]; 2845 const char *postfix = rec->timestamp_filename ? 2846 ".<timestamp>" : ""; 2847 2848 if (rec->samples && !rec->opts.full_auxtrace) 2849 scnprintf(samples, sizeof(samples), 2850 " (%" PRIu64 " samples)", rec->samples); 2851 else 2852 samples[0] = '\0'; 2853 2854 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s", 2855 perf_data__size(data) / 1024.0 / 1024.0, 2856 data->path, postfix, samples); 2857 if (ratio) { 2858 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)", 2859 rec->session->bytes_transferred / 1024.0 / 1024.0, 2860 ratio); 2861 } 2862 fprintf(stderr, " ]\n"); 2863 } 2864 2865 out_delete_session: 2866 #ifdef HAVE_EVENTFD_SUPPORT 2867 if (done_fd >= 0) { 2868 fd = done_fd; 2869 done_fd = -1; 2870 2871 close(fd); 2872 } 2873 #endif 2874 zstd_fini(&session->zstd_data); 2875 perf_session__delete(session); 2876 2877 if (!opts->no_bpf_event) 2878 evlist__stop_sb_thread(rec->sb_evlist); 2879 return status; 2880 } 2881 2882 static void callchain_debug(struct callchain_param *callchain) 2883 { 2884 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" }; 2885 2886 pr_debug("callchain: type %s\n", str[callchain->record_mode]); 2887 2888 if (callchain->record_mode == CALLCHAIN_DWARF) 2889 pr_debug("callchain: stack dump size %d\n", 2890 callchain->dump_size); 2891 } 2892 2893 int record_opts__parse_callchain(struct record_opts *record, 2894 struct callchain_param *callchain, 2895 const char *arg, bool unset) 2896 { 2897 int ret; 2898 callchain->enabled = !unset; 2899 2900 /* --no-call-graph */ 2901 if (unset) { 2902 callchain->record_mode = CALLCHAIN_NONE; 2903 pr_debug("callchain: disabled\n"); 2904 return 0; 2905 } 2906 2907 ret = parse_callchain_record_opt(arg, callchain); 2908 if (!ret) { 2909 /* Enable data address sampling for DWARF unwind. */ 2910 if (callchain->record_mode == CALLCHAIN_DWARF) 2911 record->sample_address = true; 2912 callchain_debug(callchain); 2913 } 2914 2915 return ret; 2916 } 2917 2918 int record_parse_callchain_opt(const struct option *opt, 2919 const char *arg, 2920 int unset) 2921 { 2922 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset); 2923 } 2924 2925 int record_callchain_opt(const struct option *opt, 2926 const char *arg __maybe_unused, 2927 int unset __maybe_unused) 2928 { 2929 struct callchain_param *callchain = opt->value; 2930 2931 callchain->enabled = true; 2932 2933 if (callchain->record_mode == CALLCHAIN_NONE) 2934 callchain->record_mode = CALLCHAIN_FP; 2935 2936 callchain_debug(callchain); 2937 return 0; 2938 } 2939 2940 static int perf_record_config(const char *var, const char *value, void *cb) 2941 { 2942 struct record *rec = cb; 2943 2944 if (!strcmp(var, "record.build-id")) { 2945 if (!strcmp(value, "cache")) 2946 rec->no_buildid_cache = false; 2947 else if (!strcmp(value, "no-cache")) 2948 rec->no_buildid_cache = true; 2949 else if (!strcmp(value, "skip")) 2950 rec->no_buildid = true; 2951 else if (!strcmp(value, "mmap")) 2952 rec->buildid_mmap = true; 2953 else 2954 return -1; 2955 return 0; 2956 } 2957 if (!strcmp(var, "record.call-graph")) { 2958 var = "call-graph.record-mode"; 2959 return perf_default_config(var, value, cb); 2960 } 2961 #ifdef HAVE_AIO_SUPPORT 2962 if (!strcmp(var, "record.aio")) { 2963 rec->opts.nr_cblocks = strtol(value, NULL, 0); 2964 if (!rec->opts.nr_cblocks) 2965 rec->opts.nr_cblocks = nr_cblocks_default; 2966 } 2967 #endif 2968 if (!strcmp(var, "record.debuginfod")) { 2969 rec->debuginfod.urls = strdup(value); 2970 if (!rec->debuginfod.urls) 2971 return -ENOMEM; 2972 rec->debuginfod.set = true; 2973 } 2974 2975 return 0; 2976 } 2977 2978 static int record__parse_event_enable_time(const struct option *opt, const char *str, int unset) 2979 { 2980 struct record *rec = (struct record *)opt->value; 2981 2982 return evlist__parse_event_enable_time(rec->evlist, &rec->opts, str, unset); 2983 } 2984 2985 static int record__parse_affinity(const struct option *opt, const char *str, int unset) 2986 { 2987 struct record_opts *opts = (struct record_opts *)opt->value; 2988 2989 if (unset || !str) 2990 return 0; 2991 2992 if (!strcasecmp(str, "node")) 2993 opts->affinity = PERF_AFFINITY_NODE; 2994 else if (!strcasecmp(str, "cpu")) 2995 opts->affinity = PERF_AFFINITY_CPU; 2996 2997 return 0; 2998 } 2999 3000 static int record__mmap_cpu_mask_alloc(struct mmap_cpu_mask *mask, int nr_bits) 3001 { 3002 mask->nbits = nr_bits; 3003 mask->bits = bitmap_zalloc(mask->nbits); 3004 if (!mask->bits) 3005 return -ENOMEM; 3006 3007 return 0; 3008 } 3009 3010 static void record__mmap_cpu_mask_free(struct mmap_cpu_mask *mask) 3011 { 3012 bitmap_free(mask->bits); 3013 mask->nbits = 0; 3014 } 3015 3016 static int record__thread_mask_alloc(struct thread_mask *mask, int nr_bits) 3017 { 3018 int ret; 3019 3020 ret = record__mmap_cpu_mask_alloc(&mask->maps, nr_bits); 3021 if (ret) { 3022 mask->affinity.bits = NULL; 3023 return ret; 3024 } 3025 3026 ret = record__mmap_cpu_mask_alloc(&mask->affinity, nr_bits); 3027 if (ret) { 3028 record__mmap_cpu_mask_free(&mask->maps); 3029 mask->maps.bits = NULL; 3030 } 3031 3032 return ret; 3033 } 3034 3035 static void record__thread_mask_free(struct thread_mask *mask) 3036 { 3037 record__mmap_cpu_mask_free(&mask->maps); 3038 record__mmap_cpu_mask_free(&mask->affinity); 3039 } 3040 3041 static int record__parse_threads(const struct option *opt, const char *str, int unset) 3042 { 3043 int s; 3044 struct record_opts *opts = opt->value; 3045 3046 if (unset || !str || !strlen(str)) { 3047 opts->threads_spec = THREAD_SPEC__CPU; 3048 } else { 3049 for (s = 1; s < THREAD_SPEC__MAX; s++) { 3050 if (s == THREAD_SPEC__USER) { 3051 opts->threads_user_spec = strdup(str); 3052 if (!opts->threads_user_spec) 3053 return -ENOMEM; 3054 opts->threads_spec = THREAD_SPEC__USER; 3055 break; 3056 } 3057 if (!strncasecmp(str, thread_spec_tags[s], strlen(thread_spec_tags[s]))) { 3058 opts->threads_spec = s; 3059 break; 3060 } 3061 } 3062 } 3063 3064 if (opts->threads_spec == THREAD_SPEC__USER) 3065 pr_debug("threads_spec: %s\n", opts->threads_user_spec); 3066 else 3067 pr_debug("threads_spec: %s\n", thread_spec_tags[opts->threads_spec]); 3068 3069 return 0; 3070 } 3071 3072 static int parse_output_max_size(const struct option *opt, 3073 const char *str, int unset) 3074 { 3075 unsigned long *s = (unsigned long *)opt->value; 3076 static struct parse_tag tags_size[] = { 3077 { .tag = 'B', .mult = 1 }, 3078 { .tag = 'K', .mult = 1 << 10 }, 3079 { .tag = 'M', .mult = 1 << 20 }, 3080 { .tag = 'G', .mult = 1 << 30 }, 3081 { .tag = 0 }, 3082 }; 3083 unsigned long val; 3084 3085 if (unset) { 3086 *s = 0; 3087 return 0; 3088 } 3089 3090 val = parse_tag_value(str, tags_size); 3091 if (val != (unsigned long) -1) { 3092 *s = val; 3093 return 0; 3094 } 3095 3096 return -1; 3097 } 3098 3099 static int record__parse_mmap_pages(const struct option *opt, 3100 const char *str, 3101 int unset __maybe_unused) 3102 { 3103 struct record_opts *opts = opt->value; 3104 char *s, *p; 3105 unsigned int mmap_pages; 3106 int ret; 3107 3108 if (!str) 3109 return -EINVAL; 3110 3111 s = strdup(str); 3112 if (!s) 3113 return -ENOMEM; 3114 3115 p = strchr(s, ','); 3116 if (p) 3117 *p = '\0'; 3118 3119 if (*s) { 3120 ret = __evlist__parse_mmap_pages(&mmap_pages, s); 3121 if (ret) 3122 goto out_free; 3123 opts->mmap_pages = mmap_pages; 3124 } 3125 3126 if (!p) { 3127 ret = 0; 3128 goto out_free; 3129 } 3130 3131 ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1); 3132 if (ret) 3133 goto out_free; 3134 3135 opts->auxtrace_mmap_pages = mmap_pages; 3136 3137 out_free: 3138 free(s); 3139 return ret; 3140 } 3141 3142 void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused) 3143 { 3144 } 3145 3146 static int parse_control_option(const struct option *opt, 3147 const char *str, 3148 int unset __maybe_unused) 3149 { 3150 struct record_opts *opts = opt->value; 3151 3152 return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close); 3153 } 3154 3155 static void switch_output_size_warn(struct record *rec) 3156 { 3157 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages); 3158 struct switch_output *s = &rec->switch_output; 3159 3160 wakeup_size /= 2; 3161 3162 if (s->size < wakeup_size) { 3163 char buf[100]; 3164 3165 unit_number__scnprintf(buf, sizeof(buf), wakeup_size); 3166 pr_warning("WARNING: switch-output data size lower than " 3167 "wakeup kernel buffer size (%s) " 3168 "expect bigger perf.data sizes\n", buf); 3169 } 3170 } 3171 3172 static int switch_output_setup(struct record *rec) 3173 { 3174 struct switch_output *s = &rec->switch_output; 3175 static struct parse_tag tags_size[] = { 3176 { .tag = 'B', .mult = 1 }, 3177 { .tag = 'K', .mult = 1 << 10 }, 3178 { .tag = 'M', .mult = 1 << 20 }, 3179 { .tag = 'G', .mult = 1 << 30 }, 3180 { .tag = 0 }, 3181 }; 3182 static struct parse_tag tags_time[] = { 3183 { .tag = 's', .mult = 1 }, 3184 { .tag = 'm', .mult = 60 }, 3185 { .tag = 'h', .mult = 60*60 }, 3186 { .tag = 'd', .mult = 60*60*24 }, 3187 { .tag = 0 }, 3188 }; 3189 unsigned long val; 3190 3191 /* 3192 * If we're using --switch-output-events, then we imply its 3193 * --switch-output=signal, as we'll send a SIGUSR2 from the side band 3194 * thread to its parent. 3195 */ 3196 if (rec->switch_output_event_set) { 3197 if (record__threads_enabled(rec)) { 3198 pr_warning("WARNING: --switch-output-event option is not available in parallel streaming mode.\n"); 3199 return 0; 3200 } 3201 goto do_signal; 3202 } 3203 3204 if (!s->set) 3205 return 0; 3206 3207 if (record__threads_enabled(rec)) { 3208 pr_warning("WARNING: --switch-output option is not available in parallel streaming mode.\n"); 3209 return 0; 3210 } 3211 3212 if (!strcmp(s->str, "signal")) { 3213 do_signal: 3214 s->signal = true; 3215 pr_debug("switch-output with SIGUSR2 signal\n"); 3216 goto enabled; 3217 } 3218 3219 val = parse_tag_value(s->str, tags_size); 3220 if (val != (unsigned long) -1) { 3221 s->size = val; 3222 pr_debug("switch-output with %s size threshold\n", s->str); 3223 goto enabled; 3224 } 3225 3226 val = parse_tag_value(s->str, tags_time); 3227 if (val != (unsigned long) -1) { 3228 s->time = val; 3229 pr_debug("switch-output with %s time threshold (%lu seconds)\n", 3230 s->str, s->time); 3231 goto enabled; 3232 } 3233 3234 return -1; 3235 3236 enabled: 3237 rec->timestamp_filename = true; 3238 s->enabled = true; 3239 3240 if (s->size && !rec->opts.no_buffering) 3241 switch_output_size_warn(rec); 3242 3243 return 0; 3244 } 3245 3246 static const char * const __record_usage[] = { 3247 "perf record [<options>] [<command>]", 3248 "perf record [<options>] -- <command> [<options>]", 3249 NULL 3250 }; 3251 const char * const *record_usage = __record_usage; 3252 3253 static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event, 3254 struct perf_sample *sample, struct machine *machine) 3255 { 3256 /* 3257 * We already have the kernel maps, put in place via perf_session__create_kernel_maps() 3258 * no need to add them twice. 3259 */ 3260 if (!(event->header.misc & PERF_RECORD_MISC_USER)) 3261 return 0; 3262 return perf_event__process_mmap(tool, event, sample, machine); 3263 } 3264 3265 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event, 3266 struct perf_sample *sample, struct machine *machine) 3267 { 3268 /* 3269 * We already have the kernel maps, put in place via perf_session__create_kernel_maps() 3270 * no need to add them twice. 3271 */ 3272 if (!(event->header.misc & PERF_RECORD_MISC_USER)) 3273 return 0; 3274 3275 return perf_event__process_mmap2(tool, event, sample, machine); 3276 } 3277 3278 static int process_timestamp_boundary(struct perf_tool *tool, 3279 union perf_event *event __maybe_unused, 3280 struct perf_sample *sample, 3281 struct machine *machine __maybe_unused) 3282 { 3283 struct record *rec = container_of(tool, struct record, tool); 3284 3285 set_timestamp_boundary(rec, sample->time); 3286 return 0; 3287 } 3288 3289 static int parse_record_synth_option(const struct option *opt, 3290 const char *str, 3291 int unset __maybe_unused) 3292 { 3293 struct record_opts *opts = opt->value; 3294 char *p = strdup(str); 3295 3296 if (p == NULL) 3297 return -1; 3298 3299 opts->synth = parse_synth_opt(p); 3300 free(p); 3301 3302 if (opts->synth < 0) { 3303 pr_err("Invalid synth option: %s\n", str); 3304 return -1; 3305 } 3306 return 0; 3307 } 3308 3309 /* 3310 * XXX Ideally would be local to cmd_record() and passed to a record__new 3311 * because we need to have access to it in record__exit, that is called 3312 * after cmd_record() exits, but since record_options need to be accessible to 3313 * builtin-script, leave it here. 3314 * 3315 * At least we don't ouch it in all the other functions here directly. 3316 * 3317 * Just say no to tons of global variables, sigh. 3318 */ 3319 static struct record record = { 3320 .opts = { 3321 .sample_time = true, 3322 .mmap_pages = UINT_MAX, 3323 .user_freq = UINT_MAX, 3324 .user_interval = ULLONG_MAX, 3325 .freq = 4000, 3326 .target = { 3327 .uses_mmap = true, 3328 .default_per_cpu = true, 3329 }, 3330 .mmap_flush = MMAP_FLUSH_DEFAULT, 3331 .nr_threads_synthesize = 1, 3332 .ctl_fd = -1, 3333 .ctl_fd_ack = -1, 3334 .synth = PERF_SYNTH_ALL, 3335 }, 3336 .tool = { 3337 .sample = process_sample_event, 3338 .fork = perf_event__process_fork, 3339 .exit = perf_event__process_exit, 3340 .comm = perf_event__process_comm, 3341 .namespaces = perf_event__process_namespaces, 3342 .mmap = build_id__process_mmap, 3343 .mmap2 = build_id__process_mmap2, 3344 .itrace_start = process_timestamp_boundary, 3345 .aux = process_timestamp_boundary, 3346 .ordered_events = true, 3347 }, 3348 }; 3349 3350 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP 3351 "\n\t\t\t\tDefault: fp"; 3352 3353 static bool dry_run; 3354 3355 static struct parse_events_option_args parse_events_option_args = { 3356 .evlistp = &record.evlist, 3357 }; 3358 3359 static struct parse_events_option_args switch_output_parse_events_option_args = { 3360 .evlistp = &record.sb_evlist, 3361 }; 3362 3363 /* 3364 * XXX Will stay a global variable till we fix builtin-script.c to stop messing 3365 * with it and switch to use the library functions in perf_evlist that came 3366 * from builtin-record.c, i.e. use record_opts, 3367 * evlist__prepare_workload, etc instead of fork+exec'in 'perf record', 3368 * using pipes, etc. 3369 */ 3370 static struct option __record_options[] = { 3371 OPT_CALLBACK('e', "event", &parse_events_option_args, "event", 3372 "event selector. use 'perf list' to list available events", 3373 parse_events_option), 3374 OPT_CALLBACK(0, "filter", &record.evlist, "filter", 3375 "event filter", parse_filter), 3376 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist, 3377 NULL, "don't record events from perf itself", 3378 exclude_perf), 3379 OPT_STRING('p', "pid", &record.opts.target.pid, "pid", 3380 "record events on existing process id"), 3381 OPT_STRING('t', "tid", &record.opts.target.tid, "tid", 3382 "record events on existing thread id"), 3383 OPT_INTEGER('r', "realtime", &record.realtime_prio, 3384 "collect data with this RT SCHED_FIFO priority"), 3385 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering, 3386 "collect data without buffering"), 3387 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples, 3388 "collect raw sample records from all opened counters"), 3389 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide, 3390 "system-wide collection from all CPUs"), 3391 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu", 3392 "list of cpus to monitor"), 3393 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"), 3394 OPT_STRING('o', "output", &record.data.path, "file", 3395 "output file name"), 3396 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit, 3397 &record.opts.no_inherit_set, 3398 "child tasks do not inherit counters"), 3399 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize, 3400 "synthesize non-sample events at the end of output"), 3401 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"), 3402 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"), 3403 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq, 3404 "Fail if the specified frequency can't be used"), 3405 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'", 3406 "profile at this frequency", 3407 record__parse_freq), 3408 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]", 3409 "number of mmap data pages and AUX area tracing mmap pages", 3410 record__parse_mmap_pages), 3411 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number", 3412 "Minimal number of bytes that is extracted from mmap data pages (default: 1)", 3413 record__mmap_flush_parse), 3414 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param, 3415 NULL, "enables call-graph recording" , 3416 &record_callchain_opt), 3417 OPT_CALLBACK(0, "call-graph", &record.opts, 3418 "record_mode[,record_size]", record_callchain_help, 3419 &record_parse_callchain_opt), 3420 OPT_INCR('v', "verbose", &verbose, 3421 "be more verbose (show counter open errors, etc)"), 3422 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any warnings or messages"), 3423 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat, 3424 "per thread counts"), 3425 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"), 3426 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr, 3427 "Record the sample physical addresses"), 3428 OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size, 3429 "Record the sampled data address data page size"), 3430 OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size, 3431 "Record the sampled code address (ip) page size"), 3432 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"), 3433 OPT_BOOLEAN(0, "sample-identifier", &record.opts.sample_identifier, 3434 "Record the sample identifier"), 3435 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time, 3436 &record.opts.sample_time_set, 3437 "Record the sample timestamps"), 3438 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set, 3439 "Record the sample period"), 3440 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples, 3441 "don't sample"), 3442 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache, 3443 &record.no_buildid_cache_set, 3444 "do not update the buildid cache"), 3445 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid, 3446 &record.no_buildid_set, 3447 "do not collect buildids in perf.data"), 3448 OPT_CALLBACK('G', "cgroup", &record.evlist, "name", 3449 "monitor event in cgroup name only", 3450 parse_cgroups), 3451 OPT_CALLBACK('D', "delay", &record, "ms", 3452 "ms to wait before starting measurement after program start (-1: start with events disabled), " 3453 "or ranges of time to enable events e.g. '-D 10-20,30-40'", 3454 record__parse_event_enable_time), 3455 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"), 3456 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user", 3457 "user to profile"), 3458 3459 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack, 3460 "branch any", "sample any taken branches", 3461 parse_branch_stack), 3462 3463 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack, 3464 "branch filter mask", "branch stack filter modes", 3465 parse_branch_stack), 3466 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight, 3467 "sample by weight (on special events only)"), 3468 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction, 3469 "sample transaction flags (special events only)"), 3470 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread, 3471 "use per-thread mmaps"), 3472 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register", 3473 "sample selected machine registers on interrupt," 3474 " use '-I?' to list register names", parse_intr_regs), 3475 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register", 3476 "sample selected machine registers on interrupt," 3477 " use '--user-regs=?' to list register names", parse_user_regs), 3478 OPT_BOOLEAN(0, "running-time", &record.opts.running_time, 3479 "Record running/enabled time of read (:S) events"), 3480 OPT_CALLBACK('k', "clockid", &record.opts, 3481 "clockid", "clockid to use for events, see clock_gettime()", 3482 parse_clockid), 3483 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts, 3484 "opts", "AUX area tracing Snapshot Mode", ""), 3485 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts, 3486 "opts", "sample AUX area", ""), 3487 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout, 3488 "per thread proc mmap processing timeout in ms"), 3489 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces, 3490 "Record namespaces events"), 3491 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup, 3492 "Record cgroup events"), 3493 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events, 3494 &record.opts.record_switch_events_set, 3495 "Record context switch events"), 3496 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel, 3497 "Configure all used events to run in kernel space.", 3498 PARSE_OPT_EXCLUSIVE), 3499 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user, 3500 "Configure all used events to run in user space.", 3501 PARSE_OPT_EXCLUSIVE), 3502 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains, 3503 "collect kernel callchains"), 3504 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains, 3505 "collect user callchains"), 3506 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name, 3507 "file", "vmlinux pathname"), 3508 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all, 3509 "Record build-id of all DSOs regardless of hits"), 3510 OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap, 3511 "Record build-id in map events"), 3512 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename, 3513 "append timestamp to output filename"), 3514 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary, 3515 "Record timestamp boundary (time of first/last samples)"), 3516 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str, 3517 &record.switch_output.set, "signal or size[BKMG] or time[smhd]", 3518 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold", 3519 "signal"), 3520 OPT_CALLBACK_SET(0, "switch-output-event", &switch_output_parse_events_option_args, 3521 &record.switch_output_event_set, "switch output event", 3522 "switch output event selector. use 'perf list' to list available events", 3523 parse_events_option_new_evlist), 3524 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files, 3525 "Limit number of switch output generated files"), 3526 OPT_BOOLEAN(0, "dry-run", &dry_run, 3527 "Parse options then exit"), 3528 #ifdef HAVE_AIO_SUPPORT 3529 OPT_CALLBACK_OPTARG(0, "aio", &record.opts, 3530 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)", 3531 record__aio_parse), 3532 #endif 3533 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu", 3534 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer", 3535 record__parse_affinity), 3536 #ifdef HAVE_ZSTD_SUPPORT 3537 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, "n", 3538 "Compress records using specified level (default: 1 - fastest compression, 22 - greatest compression)", 3539 record__parse_comp_level), 3540 #endif 3541 OPT_CALLBACK(0, "max-size", &record.output_max_size, 3542 "size", "Limit the maximum size of the output file", parse_output_max_size), 3543 OPT_UINTEGER(0, "num-thread-synthesize", 3544 &record.opts.nr_threads_synthesize, 3545 "number of threads to run for event synthesis"), 3546 #ifdef HAVE_LIBPFM 3547 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event", 3548 "libpfm4 event selector. use 'perf list' to list available events", 3549 parse_libpfm_events_option), 3550 #endif 3551 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]", 3552 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n" 3553 "\t\t\t 'snapshot': AUX area tracing snapshot).\n" 3554 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n" 3555 "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.", 3556 parse_control_option), 3557 OPT_CALLBACK(0, "synth", &record.opts, "no|all|task|mmap|cgroup", 3558 "Fine-tune event synthesis: default=all", parse_record_synth_option), 3559 OPT_STRING_OPTARG_SET(0, "debuginfod", &record.debuginfod.urls, 3560 &record.debuginfod.set, "debuginfod urls", 3561 "Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls", 3562 "system"), 3563 OPT_CALLBACK_OPTARG(0, "threads", &record.opts, NULL, "spec", 3564 "write collected trace data into several data files using parallel threads", 3565 record__parse_threads), 3566 OPT_BOOLEAN(0, "off-cpu", &record.off_cpu, "Enable off-cpu analysis"), 3567 OPT_END() 3568 }; 3569 3570 struct option *record_options = __record_options; 3571 3572 static int record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cpu_map *cpus) 3573 { 3574 struct perf_cpu cpu; 3575 int idx; 3576 3577 if (cpu_map__is_dummy(cpus)) 3578 return 0; 3579 3580 perf_cpu_map__for_each_cpu_skip_any(cpu, idx, cpus) { 3581 /* Return ENODEV is input cpu is greater than max cpu */ 3582 if ((unsigned long)cpu.cpu > mask->nbits) 3583 return -ENODEV; 3584 __set_bit(cpu.cpu, mask->bits); 3585 } 3586 3587 return 0; 3588 } 3589 3590 static int record__mmap_cpu_mask_init_spec(struct mmap_cpu_mask *mask, const char *mask_spec) 3591 { 3592 struct perf_cpu_map *cpus; 3593 3594 cpus = perf_cpu_map__new(mask_spec); 3595 if (!cpus) 3596 return -ENOMEM; 3597 3598 bitmap_zero(mask->bits, mask->nbits); 3599 if (record__mmap_cpu_mask_init(mask, cpus)) 3600 return -ENODEV; 3601 3602 perf_cpu_map__put(cpus); 3603 3604 return 0; 3605 } 3606 3607 static void record__free_thread_masks(struct record *rec, int nr_threads) 3608 { 3609 int t; 3610 3611 if (rec->thread_masks) 3612 for (t = 0; t < nr_threads; t++) 3613 record__thread_mask_free(&rec->thread_masks[t]); 3614 3615 zfree(&rec->thread_masks); 3616 } 3617 3618 static int record__alloc_thread_masks(struct record *rec, int nr_threads, int nr_bits) 3619 { 3620 int t, ret; 3621 3622 rec->thread_masks = zalloc(nr_threads * sizeof(*(rec->thread_masks))); 3623 if (!rec->thread_masks) { 3624 pr_err("Failed to allocate thread masks\n"); 3625 return -ENOMEM; 3626 } 3627 3628 for (t = 0; t < nr_threads; t++) { 3629 ret = record__thread_mask_alloc(&rec->thread_masks[t], nr_bits); 3630 if (ret) { 3631 pr_err("Failed to allocate thread masks[%d]\n", t); 3632 goto out_free; 3633 } 3634 } 3635 3636 return 0; 3637 3638 out_free: 3639 record__free_thread_masks(rec, nr_threads); 3640 3641 return ret; 3642 } 3643 3644 static int record__init_thread_cpu_masks(struct record *rec, struct perf_cpu_map *cpus) 3645 { 3646 int t, ret, nr_cpus = perf_cpu_map__nr(cpus); 3647 3648 ret = record__alloc_thread_masks(rec, nr_cpus, cpu__max_cpu().cpu); 3649 if (ret) 3650 return ret; 3651 3652 rec->nr_threads = nr_cpus; 3653 pr_debug("nr_threads: %d\n", rec->nr_threads); 3654 3655 for (t = 0; t < rec->nr_threads; t++) { 3656 __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].maps.bits); 3657 __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].affinity.bits); 3658 if (verbose > 0) { 3659 pr_debug("thread_masks[%d]: ", t); 3660 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps"); 3661 pr_debug("thread_masks[%d]: ", t); 3662 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity"); 3663 } 3664 } 3665 3666 return 0; 3667 } 3668 3669 static int record__init_thread_masks_spec(struct record *rec, struct perf_cpu_map *cpus, 3670 const char **maps_spec, const char **affinity_spec, 3671 u32 nr_spec) 3672 { 3673 u32 s; 3674 int ret = 0, t = 0; 3675 struct mmap_cpu_mask cpus_mask; 3676 struct thread_mask thread_mask, full_mask, *thread_masks; 3677 3678 ret = record__mmap_cpu_mask_alloc(&cpus_mask, cpu__max_cpu().cpu); 3679 if (ret) { 3680 pr_err("Failed to allocate CPUs mask\n"); 3681 return ret; 3682 } 3683 3684 ret = record__mmap_cpu_mask_init(&cpus_mask, cpus); 3685 if (ret) { 3686 pr_err("Failed to init cpu mask\n"); 3687 goto out_free_cpu_mask; 3688 } 3689 3690 ret = record__thread_mask_alloc(&full_mask, cpu__max_cpu().cpu); 3691 if (ret) { 3692 pr_err("Failed to allocate full mask\n"); 3693 goto out_free_cpu_mask; 3694 } 3695 3696 ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu); 3697 if (ret) { 3698 pr_err("Failed to allocate thread mask\n"); 3699 goto out_free_full_and_cpu_masks; 3700 } 3701 3702 for (s = 0; s < nr_spec; s++) { 3703 ret = record__mmap_cpu_mask_init_spec(&thread_mask.maps, maps_spec[s]); 3704 if (ret) { 3705 pr_err("Failed to initialize maps thread mask\n"); 3706 goto out_free; 3707 } 3708 ret = record__mmap_cpu_mask_init_spec(&thread_mask.affinity, affinity_spec[s]); 3709 if (ret) { 3710 pr_err("Failed to initialize affinity thread mask\n"); 3711 goto out_free; 3712 } 3713 3714 /* ignore invalid CPUs but do not allow empty masks */ 3715 if (!bitmap_and(thread_mask.maps.bits, thread_mask.maps.bits, 3716 cpus_mask.bits, thread_mask.maps.nbits)) { 3717 pr_err("Empty maps mask: %s\n", maps_spec[s]); 3718 ret = -EINVAL; 3719 goto out_free; 3720 } 3721 if (!bitmap_and(thread_mask.affinity.bits, thread_mask.affinity.bits, 3722 cpus_mask.bits, thread_mask.affinity.nbits)) { 3723 pr_err("Empty affinity mask: %s\n", affinity_spec[s]); 3724 ret = -EINVAL; 3725 goto out_free; 3726 } 3727 3728 /* do not allow intersection with other masks (full_mask) */ 3729 if (bitmap_intersects(thread_mask.maps.bits, full_mask.maps.bits, 3730 thread_mask.maps.nbits)) { 3731 pr_err("Intersecting maps mask: %s\n", maps_spec[s]); 3732 ret = -EINVAL; 3733 goto out_free; 3734 } 3735 if (bitmap_intersects(thread_mask.affinity.bits, full_mask.affinity.bits, 3736 thread_mask.affinity.nbits)) { 3737 pr_err("Intersecting affinity mask: %s\n", affinity_spec[s]); 3738 ret = -EINVAL; 3739 goto out_free; 3740 } 3741 3742 bitmap_or(full_mask.maps.bits, full_mask.maps.bits, 3743 thread_mask.maps.bits, full_mask.maps.nbits); 3744 bitmap_or(full_mask.affinity.bits, full_mask.affinity.bits, 3745 thread_mask.affinity.bits, full_mask.maps.nbits); 3746 3747 thread_masks = realloc(rec->thread_masks, (t + 1) * sizeof(struct thread_mask)); 3748 if (!thread_masks) { 3749 pr_err("Failed to reallocate thread masks\n"); 3750 ret = -ENOMEM; 3751 goto out_free; 3752 } 3753 rec->thread_masks = thread_masks; 3754 rec->thread_masks[t] = thread_mask; 3755 if (verbose > 0) { 3756 pr_debug("thread_masks[%d]: ", t); 3757 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps"); 3758 pr_debug("thread_masks[%d]: ", t); 3759 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity"); 3760 } 3761 t++; 3762 ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu); 3763 if (ret) { 3764 pr_err("Failed to allocate thread mask\n"); 3765 goto out_free_full_and_cpu_masks; 3766 } 3767 } 3768 rec->nr_threads = t; 3769 pr_debug("nr_threads: %d\n", rec->nr_threads); 3770 if (!rec->nr_threads) 3771 ret = -EINVAL; 3772 3773 out_free: 3774 record__thread_mask_free(&thread_mask); 3775 out_free_full_and_cpu_masks: 3776 record__thread_mask_free(&full_mask); 3777 out_free_cpu_mask: 3778 record__mmap_cpu_mask_free(&cpus_mask); 3779 3780 return ret; 3781 } 3782 3783 static int record__init_thread_core_masks(struct record *rec, struct perf_cpu_map *cpus) 3784 { 3785 int ret; 3786 struct cpu_topology *topo; 3787 3788 topo = cpu_topology__new(); 3789 if (!topo) { 3790 pr_err("Failed to allocate CPU topology\n"); 3791 return -ENOMEM; 3792 } 3793 3794 ret = record__init_thread_masks_spec(rec, cpus, topo->core_cpus_list, 3795 topo->core_cpus_list, topo->core_cpus_lists); 3796 cpu_topology__delete(topo); 3797 3798 return ret; 3799 } 3800 3801 static int record__init_thread_package_masks(struct record *rec, struct perf_cpu_map *cpus) 3802 { 3803 int ret; 3804 struct cpu_topology *topo; 3805 3806 topo = cpu_topology__new(); 3807 if (!topo) { 3808 pr_err("Failed to allocate CPU topology\n"); 3809 return -ENOMEM; 3810 } 3811 3812 ret = record__init_thread_masks_spec(rec, cpus, topo->package_cpus_list, 3813 topo->package_cpus_list, topo->package_cpus_lists); 3814 cpu_topology__delete(topo); 3815 3816 return ret; 3817 } 3818 3819 static int record__init_thread_numa_masks(struct record *rec, struct perf_cpu_map *cpus) 3820 { 3821 u32 s; 3822 int ret; 3823 const char **spec; 3824 struct numa_topology *topo; 3825 3826 topo = numa_topology__new(); 3827 if (!topo) { 3828 pr_err("Failed to allocate NUMA topology\n"); 3829 return -ENOMEM; 3830 } 3831 3832 spec = zalloc(topo->nr * sizeof(char *)); 3833 if (!spec) { 3834 pr_err("Failed to allocate NUMA spec\n"); 3835 ret = -ENOMEM; 3836 goto out_delete_topo; 3837 } 3838 for (s = 0; s < topo->nr; s++) 3839 spec[s] = topo->nodes[s].cpus; 3840 3841 ret = record__init_thread_masks_spec(rec, cpus, spec, spec, topo->nr); 3842 3843 zfree(&spec); 3844 3845 out_delete_topo: 3846 numa_topology__delete(topo); 3847 3848 return ret; 3849 } 3850 3851 static int record__init_thread_user_masks(struct record *rec, struct perf_cpu_map *cpus) 3852 { 3853 int t, ret; 3854 u32 s, nr_spec = 0; 3855 char **maps_spec = NULL, **affinity_spec = NULL, **tmp_spec; 3856 char *user_spec, *spec, *spec_ptr, *mask, *mask_ptr, *dup_mask = NULL; 3857 3858 for (t = 0, user_spec = (char *)rec->opts.threads_user_spec; ; t++, user_spec = NULL) { 3859 spec = strtok_r(user_spec, ":", &spec_ptr); 3860 if (spec == NULL) 3861 break; 3862 pr_debug2("threads_spec[%d]: %s\n", t, spec); 3863 mask = strtok_r(spec, "/", &mask_ptr); 3864 if (mask == NULL) 3865 break; 3866 pr_debug2(" maps mask: %s\n", mask); 3867 tmp_spec = realloc(maps_spec, (nr_spec + 1) * sizeof(char *)); 3868 if (!tmp_spec) { 3869 pr_err("Failed to reallocate maps spec\n"); 3870 ret = -ENOMEM; 3871 goto out_free; 3872 } 3873 maps_spec = tmp_spec; 3874 maps_spec[nr_spec] = dup_mask = strdup(mask); 3875 if (!maps_spec[nr_spec]) { 3876 pr_err("Failed to allocate maps spec[%d]\n", nr_spec); 3877 ret = -ENOMEM; 3878 goto out_free; 3879 } 3880 mask = strtok_r(NULL, "/", &mask_ptr); 3881 if (mask == NULL) { 3882 pr_err("Invalid thread maps or affinity specs\n"); 3883 ret = -EINVAL; 3884 goto out_free; 3885 } 3886 pr_debug2(" affinity mask: %s\n", mask); 3887 tmp_spec = realloc(affinity_spec, (nr_spec + 1) * sizeof(char *)); 3888 if (!tmp_spec) { 3889 pr_err("Failed to reallocate affinity spec\n"); 3890 ret = -ENOMEM; 3891 goto out_free; 3892 } 3893 affinity_spec = tmp_spec; 3894 affinity_spec[nr_spec] = strdup(mask); 3895 if (!affinity_spec[nr_spec]) { 3896 pr_err("Failed to allocate affinity spec[%d]\n", nr_spec); 3897 ret = -ENOMEM; 3898 goto out_free; 3899 } 3900 dup_mask = NULL; 3901 nr_spec++; 3902 } 3903 3904 ret = record__init_thread_masks_spec(rec, cpus, (const char **)maps_spec, 3905 (const char **)affinity_spec, nr_spec); 3906 3907 out_free: 3908 free(dup_mask); 3909 for (s = 0; s < nr_spec; s++) { 3910 if (maps_spec) 3911 free(maps_spec[s]); 3912 if (affinity_spec) 3913 free(affinity_spec[s]); 3914 } 3915 free(affinity_spec); 3916 free(maps_spec); 3917 3918 return ret; 3919 } 3920 3921 static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus) 3922 { 3923 int ret; 3924 3925 ret = record__alloc_thread_masks(rec, 1, cpu__max_cpu().cpu); 3926 if (ret) 3927 return ret; 3928 3929 if (record__mmap_cpu_mask_init(&rec->thread_masks->maps, cpus)) 3930 return -ENODEV; 3931 3932 rec->nr_threads = 1; 3933 3934 return 0; 3935 } 3936 3937 static int record__init_thread_masks(struct record *rec) 3938 { 3939 int ret = 0; 3940 struct perf_cpu_map *cpus = rec->evlist->core.all_cpus; 3941 3942 if (!record__threads_enabled(rec)) 3943 return record__init_thread_default_masks(rec, cpus); 3944 3945 if (evlist__per_thread(rec->evlist)) { 3946 pr_err("--per-thread option is mutually exclusive to parallel streaming mode.\n"); 3947 return -EINVAL; 3948 } 3949 3950 switch (rec->opts.threads_spec) { 3951 case THREAD_SPEC__CPU: 3952 ret = record__init_thread_cpu_masks(rec, cpus); 3953 break; 3954 case THREAD_SPEC__CORE: 3955 ret = record__init_thread_core_masks(rec, cpus); 3956 break; 3957 case THREAD_SPEC__PACKAGE: 3958 ret = record__init_thread_package_masks(rec, cpus); 3959 break; 3960 case THREAD_SPEC__NUMA: 3961 ret = record__init_thread_numa_masks(rec, cpus); 3962 break; 3963 case THREAD_SPEC__USER: 3964 ret = record__init_thread_user_masks(rec, cpus); 3965 break; 3966 default: 3967 break; 3968 } 3969 3970 return ret; 3971 } 3972 3973 int cmd_record(int argc, const char **argv) 3974 { 3975 int err; 3976 struct record *rec = &record; 3977 char errbuf[BUFSIZ]; 3978 3979 setlocale(LC_ALL, ""); 3980 3981 #ifndef HAVE_BPF_SKEL 3982 # define set_nobuild(s, l, m, c) set_option_nobuild(record_options, s, l, m, c) 3983 set_nobuild('\0', "off-cpu", "no BUILD_BPF_SKEL=1", true); 3984 # undef set_nobuild 3985 #endif 3986 3987 /* Disable eager loading of kernel symbols that adds overhead to perf record. */ 3988 symbol_conf.lazy_load_kernel_maps = true; 3989 rec->opts.affinity = PERF_AFFINITY_SYS; 3990 3991 rec->evlist = evlist__new(); 3992 if (rec->evlist == NULL) 3993 return -ENOMEM; 3994 3995 err = perf_config(perf_record_config, rec); 3996 if (err) 3997 return err; 3998 3999 argc = parse_options(argc, argv, record_options, record_usage, 4000 PARSE_OPT_STOP_AT_NON_OPTION); 4001 if (quiet) 4002 perf_quiet_option(); 4003 4004 err = symbol__validate_sym_arguments(); 4005 if (err) 4006 return err; 4007 4008 perf_debuginfod_setup(&record.debuginfod); 4009 4010 /* Make system wide (-a) the default target. */ 4011 if (!argc && target__none(&rec->opts.target)) 4012 rec->opts.target.system_wide = true; 4013 4014 if (nr_cgroups && !rec->opts.target.system_wide) { 4015 usage_with_options_msg(record_usage, record_options, 4016 "cgroup monitoring only available in system-wide mode"); 4017 4018 } 4019 4020 if (rec->buildid_mmap) { 4021 if (!perf_can_record_build_id()) { 4022 pr_err("Failed: no support to record build id in mmap events, update your kernel.\n"); 4023 err = -EINVAL; 4024 goto out_opts; 4025 } 4026 pr_debug("Enabling build id in mmap2 events.\n"); 4027 /* Enable mmap build id synthesizing. */ 4028 symbol_conf.buildid_mmap2 = true; 4029 /* Enable perf_event_attr::build_id bit. */ 4030 rec->opts.build_id = true; 4031 /* Disable build id cache. */ 4032 rec->no_buildid = true; 4033 } 4034 4035 if (rec->opts.record_cgroup && !perf_can_record_cgroup()) { 4036 pr_err("Kernel has no cgroup sampling support.\n"); 4037 err = -EINVAL; 4038 goto out_opts; 4039 } 4040 4041 if (rec->opts.kcore) 4042 rec->opts.text_poke = true; 4043 4044 if (rec->opts.kcore || record__threads_enabled(rec)) 4045 rec->data.is_dir = true; 4046 4047 if (record__threads_enabled(rec)) { 4048 if (rec->opts.affinity != PERF_AFFINITY_SYS) { 4049 pr_err("--affinity option is mutually exclusive to parallel streaming mode.\n"); 4050 goto out_opts; 4051 } 4052 if (record__aio_enabled(rec)) { 4053 pr_err("Asynchronous streaming mode (--aio) is mutually exclusive to parallel streaming mode.\n"); 4054 goto out_opts; 4055 } 4056 } 4057 4058 if (rec->opts.comp_level != 0) { 4059 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n"); 4060 rec->no_buildid = true; 4061 } 4062 4063 if (rec->opts.record_switch_events && 4064 !perf_can_record_switch_events()) { 4065 ui__error("kernel does not support recording context switch events\n"); 4066 parse_options_usage(record_usage, record_options, "switch-events", 0); 4067 err = -EINVAL; 4068 goto out_opts; 4069 } 4070 4071 if (switch_output_setup(rec)) { 4072 parse_options_usage(record_usage, record_options, "switch-output", 0); 4073 err = -EINVAL; 4074 goto out_opts; 4075 } 4076 4077 if (rec->switch_output.time) { 4078 signal(SIGALRM, alarm_sig_handler); 4079 alarm(rec->switch_output.time); 4080 } 4081 4082 if (rec->switch_output.num_files) { 4083 rec->switch_output.filenames = calloc(rec->switch_output.num_files, 4084 sizeof(char *)); 4085 if (!rec->switch_output.filenames) { 4086 err = -EINVAL; 4087 goto out_opts; 4088 } 4089 } 4090 4091 if (rec->timestamp_filename && record__threads_enabled(rec)) { 4092 rec->timestamp_filename = false; 4093 pr_warning("WARNING: --timestamp-filename option is not available in parallel streaming mode.\n"); 4094 } 4095 4096 /* 4097 * Allow aliases to facilitate the lookup of symbols for address 4098 * filters. Refer to auxtrace_parse_filters(). 4099 */ 4100 symbol_conf.allow_aliases = true; 4101 4102 symbol__init(NULL); 4103 4104 err = record__auxtrace_init(rec); 4105 if (err) 4106 goto out; 4107 4108 if (dry_run) 4109 goto out; 4110 4111 err = -ENOMEM; 4112 4113 if (rec->no_buildid_cache || rec->no_buildid) { 4114 disable_buildid_cache(); 4115 } else if (rec->switch_output.enabled) { 4116 /* 4117 * In 'perf record --switch-output', disable buildid 4118 * generation by default to reduce data file switching 4119 * overhead. Still generate buildid if they are required 4120 * explicitly using 4121 * 4122 * perf record --switch-output --no-no-buildid \ 4123 * --no-no-buildid-cache 4124 * 4125 * Following code equals to: 4126 * 4127 * if ((rec->no_buildid || !rec->no_buildid_set) && 4128 * (rec->no_buildid_cache || !rec->no_buildid_cache_set)) 4129 * disable_buildid_cache(); 4130 */ 4131 bool disable = true; 4132 4133 if (rec->no_buildid_set && !rec->no_buildid) 4134 disable = false; 4135 if (rec->no_buildid_cache_set && !rec->no_buildid_cache) 4136 disable = false; 4137 if (disable) { 4138 rec->no_buildid = true; 4139 rec->no_buildid_cache = true; 4140 disable_buildid_cache(); 4141 } 4142 } 4143 4144 if (record.opts.overwrite) 4145 record.opts.tail_synthesize = true; 4146 4147 if (rec->evlist->core.nr_entries == 0) { 4148 bool can_profile_kernel = perf_event_paranoid_check(1); 4149 4150 err = parse_event(rec->evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu"); 4151 if (err) 4152 goto out; 4153 } 4154 4155 if (rec->opts.target.tid && !rec->opts.no_inherit_set) 4156 rec->opts.no_inherit = true; 4157 4158 err = target__validate(&rec->opts.target); 4159 if (err) { 4160 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); 4161 ui__warning("%s\n", errbuf); 4162 } 4163 4164 err = target__parse_uid(&rec->opts.target); 4165 if (err) { 4166 int saved_errno = errno; 4167 4168 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ); 4169 ui__error("%s", errbuf); 4170 4171 err = -saved_errno; 4172 goto out; 4173 } 4174 4175 /* Enable ignoring missing threads when -u/-p option is defined. */ 4176 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid; 4177 4178 evlist__warn_user_requested_cpus(rec->evlist, rec->opts.target.cpu_list); 4179 4180 if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP) 4181 arch__add_leaf_frame_record_opts(&rec->opts); 4182 4183 err = -ENOMEM; 4184 if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) { 4185 if (rec->opts.target.pid != NULL) { 4186 pr_err("Couldn't create thread/CPU maps: %s\n", 4187 errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf))); 4188 goto out; 4189 } 4190 else 4191 usage_with_options(record_usage, record_options); 4192 } 4193 4194 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts); 4195 if (err) 4196 goto out; 4197 4198 /* 4199 * We take all buildids when the file contains 4200 * AUX area tracing data because we do not decode the 4201 * trace because it would take too long. 4202 */ 4203 if (rec->opts.full_auxtrace) 4204 rec->buildid_all = true; 4205 4206 if (rec->opts.text_poke) { 4207 err = record__config_text_poke(rec->evlist); 4208 if (err) { 4209 pr_err("record__config_text_poke failed, error %d\n", err); 4210 goto out; 4211 } 4212 } 4213 4214 if (rec->off_cpu) { 4215 err = record__config_off_cpu(rec); 4216 if (err) { 4217 pr_err("record__config_off_cpu failed, error %d\n", err); 4218 goto out; 4219 } 4220 } 4221 4222 if (record_opts__config(&rec->opts)) { 4223 err = -EINVAL; 4224 goto out; 4225 } 4226 4227 err = record__config_tracking_events(rec); 4228 if (err) { 4229 pr_err("record__config_tracking_events failed, error %d\n", err); 4230 goto out; 4231 } 4232 4233 err = record__init_thread_masks(rec); 4234 if (err) { 4235 pr_err("Failed to initialize parallel data streaming masks\n"); 4236 goto out; 4237 } 4238 4239 if (rec->opts.nr_cblocks > nr_cblocks_max) 4240 rec->opts.nr_cblocks = nr_cblocks_max; 4241 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks); 4242 4243 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]); 4244 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush); 4245 4246 if (rec->opts.comp_level > comp_level_max) 4247 rec->opts.comp_level = comp_level_max; 4248 pr_debug("comp level: %d\n", rec->opts.comp_level); 4249 4250 err = __cmd_record(&record, argc, argv); 4251 out: 4252 evlist__delete(rec->evlist); 4253 symbol__exit(); 4254 auxtrace_record__free(rec->itr); 4255 out_opts: 4256 record__free_thread_masks(rec, rec->nr_threads); 4257 rec->nr_threads = 0; 4258 evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close); 4259 return err; 4260 } 4261 4262 static void snapshot_sig_handler(int sig __maybe_unused) 4263 { 4264 struct record *rec = &record; 4265 4266 hit_auxtrace_snapshot_trigger(rec); 4267 4268 if (switch_output_signal(rec)) 4269 trigger_hit(&switch_output_trigger); 4270 } 4271 4272 static void alarm_sig_handler(int sig __maybe_unused) 4273 { 4274 struct record *rec = &record; 4275 4276 if (switch_output_time(rec)) 4277 trigger_hit(&switch_output_trigger); 4278 } 4279