1 #define _FILE_OFFSET_BITS 64 2 3 #include <linux/kernel.h> 4 5 #include <byteswap.h> 6 #include <unistd.h> 7 #include <sys/types.h> 8 #include <sys/mman.h> 9 10 #include "evlist.h" 11 #include "evsel.h" 12 #include "session.h" 13 #include "sort.h" 14 #include "util.h" 15 16 static int perf_session__open(struct perf_session *self, bool force) 17 { 18 struct stat input_stat; 19 20 if (!strcmp(self->filename, "-")) { 21 self->fd_pipe = true; 22 self->fd = STDIN_FILENO; 23 24 if (perf_session__read_header(self, self->fd) < 0) 25 pr_err("incompatible file format"); 26 27 return 0; 28 } 29 30 self->fd = open(self->filename, O_RDONLY); 31 if (self->fd < 0) { 32 int err = errno; 33 34 pr_err("failed to open %s: %s", self->filename, strerror(err)); 35 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 36 pr_err(" (try 'perf record' first)"); 37 pr_err("\n"); 38 return -errno; 39 } 40 41 if (fstat(self->fd, &input_stat) < 0) 42 goto out_close; 43 44 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 45 pr_err("file %s not owned by current user or root\n", 46 self->filename); 47 goto out_close; 48 } 49 50 if (!input_stat.st_size) { 51 pr_info("zero-sized file (%s), nothing to do!\n", 52 self->filename); 53 goto out_close; 54 } 55 56 if (perf_session__read_header(self, self->fd) < 0) { 57 pr_err("incompatible file format"); 58 goto out_close; 59 } 60 61 self->size = input_stat.st_size; 62 return 0; 63 64 out_close: 65 close(self->fd); 66 self->fd = -1; 67 return -1; 68 } 69 70 static void perf_session__id_header_size(struct perf_session *session) 71 { 72 struct perf_sample *data; 73 u64 sample_type = session->sample_type; 74 u16 size = 0; 75 76 if (!session->sample_id_all) 77 goto out; 78 79 if (sample_type & PERF_SAMPLE_TID) 80 size += sizeof(data->tid) * 2; 81 82 if (sample_type & PERF_SAMPLE_TIME) 83 size += sizeof(data->time); 84 85 if (sample_type & PERF_SAMPLE_ID) 86 size += sizeof(data->id); 87 88 if (sample_type & PERF_SAMPLE_STREAM_ID) 89 size += sizeof(data->stream_id); 90 91 if (sample_type & PERF_SAMPLE_CPU) 92 size += sizeof(data->cpu) * 2; 93 out: 94 session->id_hdr_size = size; 95 } 96 97 void perf_session__update_sample_type(struct perf_session *self) 98 { 99 self->sample_type = perf_evlist__sample_type(self->evlist); 100 self->sample_size = perf_sample_size(self->sample_type); 101 self->sample_id_all = perf_evlist__sample_id_all(self->evlist); 102 perf_session__id_header_size(self); 103 } 104 105 int perf_session__create_kernel_maps(struct perf_session *self) 106 { 107 int ret = machine__create_kernel_maps(&self->host_machine); 108 109 if (ret >= 0) 110 ret = machines__create_guest_kernel_maps(&self->machines); 111 return ret; 112 } 113 114 static void perf_session__destroy_kernel_maps(struct perf_session *self) 115 { 116 machine__destroy_kernel_maps(&self->host_machine); 117 machines__destroy_guest_kernel_maps(&self->machines); 118 } 119 120 struct perf_session *perf_session__new(const char *filename, int mode, 121 bool force, bool repipe, 122 struct perf_event_ops *ops) 123 { 124 size_t len = filename ? strlen(filename) + 1 : 0; 125 struct perf_session *self = zalloc(sizeof(*self) + len); 126 127 if (self == NULL) 128 goto out; 129 130 memcpy(self->filename, filename, len); 131 self->threads = RB_ROOT; 132 INIT_LIST_HEAD(&self->dead_threads); 133 self->last_match = NULL; 134 /* 135 * On 64bit we can mmap the data file in one go. No need for tiny mmap 136 * slices. On 32bit we use 32MB. 137 */ 138 #if BITS_PER_LONG == 64 139 self->mmap_window = ULLONG_MAX; 140 #else 141 self->mmap_window = 32 * 1024 * 1024ULL; 142 #endif 143 self->machines = RB_ROOT; 144 self->repipe = repipe; 145 INIT_LIST_HEAD(&self->ordered_samples.samples); 146 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 147 INIT_LIST_HEAD(&self->ordered_samples.to_free); 148 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 149 150 if (mode == O_RDONLY) { 151 if (perf_session__open(self, force) < 0) 152 goto out_delete; 153 perf_session__update_sample_type(self); 154 } else if (mode == O_WRONLY) { 155 /* 156 * In O_RDONLY mode this will be performed when reading the 157 * kernel MMAP event, in perf_event__process_mmap(). 158 */ 159 if (perf_session__create_kernel_maps(self) < 0) 160 goto out_delete; 161 } 162 163 if (ops && ops->ordering_requires_timestamps && 164 ops->ordered_samples && !self->sample_id_all) { 165 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 166 ops->ordered_samples = false; 167 } 168 169 out: 170 return self; 171 out_delete: 172 perf_session__delete(self); 173 return NULL; 174 } 175 176 static void perf_session__delete_dead_threads(struct perf_session *self) 177 { 178 struct thread *n, *t; 179 180 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 181 list_del(&t->node); 182 thread__delete(t); 183 } 184 } 185 186 static void perf_session__delete_threads(struct perf_session *self) 187 { 188 struct rb_node *nd = rb_first(&self->threads); 189 190 while (nd) { 191 struct thread *t = rb_entry(nd, struct thread, rb_node); 192 193 rb_erase(&t->rb_node, &self->threads); 194 nd = rb_next(nd); 195 thread__delete(t); 196 } 197 } 198 199 void perf_session__delete(struct perf_session *self) 200 { 201 perf_session__destroy_kernel_maps(self); 202 perf_session__delete_dead_threads(self); 203 perf_session__delete_threads(self); 204 machine__exit(&self->host_machine); 205 close(self->fd); 206 free(self); 207 } 208 209 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 210 { 211 self->last_match = NULL; 212 rb_erase(&th->rb_node, &self->threads); 213 /* 214 * We may have references to this thread, for instance in some hist_entry 215 * instances, so just move them to a separate list. 216 */ 217 list_add_tail(&th->node, &self->dead_threads); 218 } 219 220 static bool symbol__match_parent_regex(struct symbol *sym) 221 { 222 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 223 return 1; 224 225 return 0; 226 } 227 228 int perf_session__resolve_callchain(struct perf_session *self, 229 struct thread *thread, 230 struct ip_callchain *chain, 231 struct symbol **parent) 232 { 233 u8 cpumode = PERF_RECORD_MISC_USER; 234 unsigned int i; 235 int err; 236 237 callchain_cursor_reset(&self->callchain_cursor); 238 239 for (i = 0; i < chain->nr; i++) { 240 u64 ip = chain->ips[i]; 241 struct addr_location al; 242 243 if (ip >= PERF_CONTEXT_MAX) { 244 switch (ip) { 245 case PERF_CONTEXT_HV: 246 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 247 case PERF_CONTEXT_KERNEL: 248 cpumode = PERF_RECORD_MISC_KERNEL; break; 249 case PERF_CONTEXT_USER: 250 cpumode = PERF_RECORD_MISC_USER; break; 251 default: 252 break; 253 } 254 continue; 255 } 256 257 al.filtered = false; 258 thread__find_addr_location(thread, self, cpumode, 259 MAP__FUNCTION, thread->pid, ip, &al, NULL); 260 if (al.sym != NULL) { 261 if (sort__has_parent && !*parent && 262 symbol__match_parent_regex(al.sym)) 263 *parent = al.sym; 264 if (!symbol_conf.use_callchain) 265 break; 266 } 267 268 err = callchain_cursor_append(&self->callchain_cursor, 269 ip, al.map, al.sym); 270 if (err) 271 return err; 272 } 273 274 return 0; 275 } 276 277 static int process_event_synth_stub(union perf_event *event __used, 278 struct perf_session *session __used) 279 { 280 dump_printf(": unhandled!\n"); 281 return 0; 282 } 283 284 static int process_event_sample_stub(union perf_event *event __used, 285 struct perf_sample *sample __used, 286 struct perf_evsel *evsel __used, 287 struct perf_session *session __used) 288 { 289 dump_printf(": unhandled!\n"); 290 return 0; 291 } 292 293 static int process_event_stub(union perf_event *event __used, 294 struct perf_sample *sample __used, 295 struct perf_session *session __used) 296 { 297 dump_printf(": unhandled!\n"); 298 return 0; 299 } 300 301 static int process_finished_round_stub(union perf_event *event __used, 302 struct perf_session *session __used, 303 struct perf_event_ops *ops __used) 304 { 305 dump_printf(": unhandled!\n"); 306 return 0; 307 } 308 309 static int process_finished_round(union perf_event *event, 310 struct perf_session *session, 311 struct perf_event_ops *ops); 312 313 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 314 { 315 if (handler->sample == NULL) 316 handler->sample = process_event_sample_stub; 317 if (handler->mmap == NULL) 318 handler->mmap = process_event_stub; 319 if (handler->comm == NULL) 320 handler->comm = process_event_stub; 321 if (handler->fork == NULL) 322 handler->fork = process_event_stub; 323 if (handler->exit == NULL) 324 handler->exit = process_event_stub; 325 if (handler->lost == NULL) 326 handler->lost = perf_event__process_lost; 327 if (handler->read == NULL) 328 handler->read = process_event_stub; 329 if (handler->throttle == NULL) 330 handler->throttle = process_event_stub; 331 if (handler->unthrottle == NULL) 332 handler->unthrottle = process_event_stub; 333 if (handler->attr == NULL) 334 handler->attr = process_event_synth_stub; 335 if (handler->event_type == NULL) 336 handler->event_type = process_event_synth_stub; 337 if (handler->tracing_data == NULL) 338 handler->tracing_data = process_event_synth_stub; 339 if (handler->build_id == NULL) 340 handler->build_id = process_event_synth_stub; 341 if (handler->finished_round == NULL) { 342 if (handler->ordered_samples) 343 handler->finished_round = process_finished_round; 344 else 345 handler->finished_round = process_finished_round_stub; 346 } 347 } 348 349 void mem_bswap_64(void *src, int byte_size) 350 { 351 u64 *m = src; 352 353 while (byte_size > 0) { 354 *m = bswap_64(*m); 355 byte_size -= sizeof(u64); 356 ++m; 357 } 358 } 359 360 static void perf_event__all64_swap(union perf_event *event) 361 { 362 struct perf_event_header *hdr = &event->header; 363 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 364 } 365 366 static void perf_event__comm_swap(union perf_event *event) 367 { 368 event->comm.pid = bswap_32(event->comm.pid); 369 event->comm.tid = bswap_32(event->comm.tid); 370 } 371 372 static void perf_event__mmap_swap(union perf_event *event) 373 { 374 event->mmap.pid = bswap_32(event->mmap.pid); 375 event->mmap.tid = bswap_32(event->mmap.tid); 376 event->mmap.start = bswap_64(event->mmap.start); 377 event->mmap.len = bswap_64(event->mmap.len); 378 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 379 } 380 381 static void perf_event__task_swap(union perf_event *event) 382 { 383 event->fork.pid = bswap_32(event->fork.pid); 384 event->fork.tid = bswap_32(event->fork.tid); 385 event->fork.ppid = bswap_32(event->fork.ppid); 386 event->fork.ptid = bswap_32(event->fork.ptid); 387 event->fork.time = bswap_64(event->fork.time); 388 } 389 390 static void perf_event__read_swap(union perf_event *event) 391 { 392 event->read.pid = bswap_32(event->read.pid); 393 event->read.tid = bswap_32(event->read.tid); 394 event->read.value = bswap_64(event->read.value); 395 event->read.time_enabled = bswap_64(event->read.time_enabled); 396 event->read.time_running = bswap_64(event->read.time_running); 397 event->read.id = bswap_64(event->read.id); 398 } 399 400 static void perf_event__attr_swap(union perf_event *event) 401 { 402 size_t size; 403 404 event->attr.attr.type = bswap_32(event->attr.attr.type); 405 event->attr.attr.size = bswap_32(event->attr.attr.size); 406 event->attr.attr.config = bswap_64(event->attr.attr.config); 407 event->attr.attr.sample_period = bswap_64(event->attr.attr.sample_period); 408 event->attr.attr.sample_type = bswap_64(event->attr.attr.sample_type); 409 event->attr.attr.read_format = bswap_64(event->attr.attr.read_format); 410 event->attr.attr.wakeup_events = bswap_32(event->attr.attr.wakeup_events); 411 event->attr.attr.bp_type = bswap_32(event->attr.attr.bp_type); 412 event->attr.attr.bp_addr = bswap_64(event->attr.attr.bp_addr); 413 event->attr.attr.bp_len = bswap_64(event->attr.attr.bp_len); 414 415 size = event->header.size; 416 size -= (void *)&event->attr.id - (void *)event; 417 mem_bswap_64(event->attr.id, size); 418 } 419 420 static void perf_event__event_type_swap(union perf_event *event) 421 { 422 event->event_type.event_type.event_id = 423 bswap_64(event->event_type.event_type.event_id); 424 } 425 426 static void perf_event__tracing_data_swap(union perf_event *event) 427 { 428 event->tracing_data.size = bswap_32(event->tracing_data.size); 429 } 430 431 typedef void (*perf_event__swap_op)(union perf_event *event); 432 433 static perf_event__swap_op perf_event__swap_ops[] = { 434 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 435 [PERF_RECORD_COMM] = perf_event__comm_swap, 436 [PERF_RECORD_FORK] = perf_event__task_swap, 437 [PERF_RECORD_EXIT] = perf_event__task_swap, 438 [PERF_RECORD_LOST] = perf_event__all64_swap, 439 [PERF_RECORD_READ] = perf_event__read_swap, 440 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 441 [PERF_RECORD_HEADER_ATTR] = perf_event__attr_swap, 442 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 443 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 444 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 445 [PERF_RECORD_HEADER_MAX] = NULL, 446 }; 447 448 struct sample_queue { 449 u64 timestamp; 450 u64 file_offset; 451 union perf_event *event; 452 struct list_head list; 453 }; 454 455 static void perf_session_free_sample_buffers(struct perf_session *session) 456 { 457 struct ordered_samples *os = &session->ordered_samples; 458 459 while (!list_empty(&os->to_free)) { 460 struct sample_queue *sq; 461 462 sq = list_entry(os->to_free.next, struct sample_queue, list); 463 list_del(&sq->list); 464 free(sq); 465 } 466 } 467 468 static int perf_session_deliver_event(struct perf_session *session, 469 union perf_event *event, 470 struct perf_sample *sample, 471 struct perf_event_ops *ops, 472 u64 file_offset); 473 474 static void flush_sample_queue(struct perf_session *s, 475 struct perf_event_ops *ops) 476 { 477 struct ordered_samples *os = &s->ordered_samples; 478 struct list_head *head = &os->samples; 479 struct sample_queue *tmp, *iter; 480 struct perf_sample sample; 481 u64 limit = os->next_flush; 482 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 483 484 if (!ops->ordered_samples || !limit) 485 return; 486 487 list_for_each_entry_safe(iter, tmp, head, list) { 488 if (iter->timestamp > limit) 489 break; 490 491 perf_session__parse_sample(s, iter->event, &sample); 492 perf_session_deliver_event(s, iter->event, &sample, ops, 493 iter->file_offset); 494 495 os->last_flush = iter->timestamp; 496 list_del(&iter->list); 497 list_add(&iter->list, &os->sample_cache); 498 } 499 500 if (list_empty(head)) { 501 os->last_sample = NULL; 502 } else if (last_ts <= limit) { 503 os->last_sample = 504 list_entry(head->prev, struct sample_queue, list); 505 } 506 } 507 508 /* 509 * When perf record finishes a pass on every buffers, it records this pseudo 510 * event. 511 * We record the max timestamp t found in the pass n. 512 * Assuming these timestamps are monotonic across cpus, we know that if 513 * a buffer still has events with timestamps below t, they will be all 514 * available and then read in the pass n + 1. 515 * Hence when we start to read the pass n + 2, we can safely flush every 516 * events with timestamps below t. 517 * 518 * ============ PASS n ================= 519 * CPU 0 | CPU 1 520 * | 521 * cnt1 timestamps | cnt2 timestamps 522 * 1 | 2 523 * 2 | 3 524 * - | 4 <--- max recorded 525 * 526 * ============ PASS n + 1 ============== 527 * CPU 0 | CPU 1 528 * | 529 * cnt1 timestamps | cnt2 timestamps 530 * 3 | 5 531 * 4 | 6 532 * 5 | 7 <---- max recorded 533 * 534 * Flush every events below timestamp 4 535 * 536 * ============ PASS n + 2 ============== 537 * CPU 0 | CPU 1 538 * | 539 * cnt1 timestamps | cnt2 timestamps 540 * 6 | 8 541 * 7 | 9 542 * - | 10 543 * 544 * Flush every events below timestamp 7 545 * etc... 546 */ 547 static int process_finished_round(union perf_event *event __used, 548 struct perf_session *session, 549 struct perf_event_ops *ops) 550 { 551 flush_sample_queue(session, ops); 552 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 553 554 return 0; 555 } 556 557 /* The queue is ordered by time */ 558 static void __queue_event(struct sample_queue *new, struct perf_session *s) 559 { 560 struct ordered_samples *os = &s->ordered_samples; 561 struct sample_queue *sample = os->last_sample; 562 u64 timestamp = new->timestamp; 563 struct list_head *p; 564 565 os->last_sample = new; 566 567 if (!sample) { 568 list_add(&new->list, &os->samples); 569 os->max_timestamp = timestamp; 570 return; 571 } 572 573 /* 574 * last_sample might point to some random place in the list as it's 575 * the last queued event. We expect that the new event is close to 576 * this. 577 */ 578 if (sample->timestamp <= timestamp) { 579 while (sample->timestamp <= timestamp) { 580 p = sample->list.next; 581 if (p == &os->samples) { 582 list_add_tail(&new->list, &os->samples); 583 os->max_timestamp = timestamp; 584 return; 585 } 586 sample = list_entry(p, struct sample_queue, list); 587 } 588 list_add_tail(&new->list, &sample->list); 589 } else { 590 while (sample->timestamp > timestamp) { 591 p = sample->list.prev; 592 if (p == &os->samples) { 593 list_add(&new->list, &os->samples); 594 return; 595 } 596 sample = list_entry(p, struct sample_queue, list); 597 } 598 list_add(&new->list, &sample->list); 599 } 600 } 601 602 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 603 604 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 605 struct perf_sample *sample, u64 file_offset) 606 { 607 struct ordered_samples *os = &s->ordered_samples; 608 struct list_head *sc = &os->sample_cache; 609 u64 timestamp = sample->time; 610 struct sample_queue *new; 611 612 if (!timestamp || timestamp == ~0ULL) 613 return -ETIME; 614 615 if (timestamp < s->ordered_samples.last_flush) { 616 printf("Warning: Timestamp below last timeslice flush\n"); 617 return -EINVAL; 618 } 619 620 if (!list_empty(sc)) { 621 new = list_entry(sc->next, struct sample_queue, list); 622 list_del(&new->list); 623 } else if (os->sample_buffer) { 624 new = os->sample_buffer + os->sample_buffer_idx; 625 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 626 os->sample_buffer = NULL; 627 } else { 628 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 629 if (!os->sample_buffer) 630 return -ENOMEM; 631 list_add(&os->sample_buffer->list, &os->to_free); 632 os->sample_buffer_idx = 2; 633 new = os->sample_buffer + 1; 634 } 635 636 new->timestamp = timestamp; 637 new->file_offset = file_offset; 638 new->event = event; 639 640 __queue_event(new, s); 641 642 return 0; 643 } 644 645 static void callchain__printf(struct perf_sample *sample) 646 { 647 unsigned int i; 648 649 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 650 651 for (i = 0; i < sample->callchain->nr; i++) 652 printf("..... %2d: %016" PRIx64 "\n", 653 i, sample->callchain->ips[i]); 654 } 655 656 static void perf_session__print_tstamp(struct perf_session *session, 657 union perf_event *event, 658 struct perf_sample *sample) 659 { 660 if (event->header.type != PERF_RECORD_SAMPLE && 661 !session->sample_id_all) { 662 fputs("-1 -1 ", stdout); 663 return; 664 } 665 666 if ((session->sample_type & PERF_SAMPLE_CPU)) 667 printf("%u ", sample->cpu); 668 669 if (session->sample_type & PERF_SAMPLE_TIME) 670 printf("%" PRIu64 " ", sample->time); 671 } 672 673 static void dump_event(struct perf_session *session, union perf_event *event, 674 u64 file_offset, struct perf_sample *sample) 675 { 676 if (!dump_trace) 677 return; 678 679 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 680 file_offset, event->header.size, event->header.type); 681 682 trace_event(event); 683 684 if (sample) 685 perf_session__print_tstamp(session, event, sample); 686 687 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 688 event->header.size, perf_event__name(event->header.type)); 689 } 690 691 static void dump_sample(struct perf_session *session, union perf_event *event, 692 struct perf_sample *sample) 693 { 694 if (!dump_trace) 695 return; 696 697 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 "\n", 698 event->header.misc, sample->pid, sample->tid, sample->ip, 699 sample->period); 700 701 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 702 callchain__printf(sample); 703 } 704 705 static int perf_session_deliver_event(struct perf_session *session, 706 union perf_event *event, 707 struct perf_sample *sample, 708 struct perf_event_ops *ops, 709 u64 file_offset) 710 { 711 struct perf_evsel *evsel; 712 713 dump_event(session, event, file_offset, sample); 714 715 switch (event->header.type) { 716 case PERF_RECORD_SAMPLE: 717 dump_sample(session, event, sample); 718 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 719 if (evsel == NULL) { 720 ++session->hists.stats.nr_unknown_id; 721 return -1; 722 } 723 return ops->sample(event, sample, evsel, session); 724 case PERF_RECORD_MMAP: 725 return ops->mmap(event, sample, session); 726 case PERF_RECORD_COMM: 727 return ops->comm(event, sample, session); 728 case PERF_RECORD_FORK: 729 return ops->fork(event, sample, session); 730 case PERF_RECORD_EXIT: 731 return ops->exit(event, sample, session); 732 case PERF_RECORD_LOST: 733 return ops->lost(event, sample, session); 734 case PERF_RECORD_READ: 735 return ops->read(event, sample, session); 736 case PERF_RECORD_THROTTLE: 737 return ops->throttle(event, sample, session); 738 case PERF_RECORD_UNTHROTTLE: 739 return ops->unthrottle(event, sample, session); 740 default: 741 ++session->hists.stats.nr_unknown_events; 742 return -1; 743 } 744 } 745 746 static int perf_session__preprocess_sample(struct perf_session *session, 747 union perf_event *event, struct perf_sample *sample) 748 { 749 if (event->header.type != PERF_RECORD_SAMPLE || 750 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 751 return 0; 752 753 if (!ip_callchain__valid(sample->callchain, event)) { 754 pr_debug("call-chain problem with event, skipping it.\n"); 755 ++session->hists.stats.nr_invalid_chains; 756 session->hists.stats.total_invalid_chains += sample->period; 757 return -EINVAL; 758 } 759 return 0; 760 } 761 762 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 763 struct perf_event_ops *ops, u64 file_offset) 764 { 765 dump_event(session, event, file_offset, NULL); 766 767 /* These events are processed right away */ 768 switch (event->header.type) { 769 case PERF_RECORD_HEADER_ATTR: 770 return ops->attr(event, session); 771 case PERF_RECORD_HEADER_EVENT_TYPE: 772 return ops->event_type(event, session); 773 case PERF_RECORD_HEADER_TRACING_DATA: 774 /* setup for reading amidst mmap */ 775 lseek(session->fd, file_offset, SEEK_SET); 776 return ops->tracing_data(event, session); 777 case PERF_RECORD_HEADER_BUILD_ID: 778 return ops->build_id(event, session); 779 case PERF_RECORD_FINISHED_ROUND: 780 return ops->finished_round(event, session, ops); 781 default: 782 return -EINVAL; 783 } 784 } 785 786 static int perf_session__process_event(struct perf_session *session, 787 union perf_event *event, 788 struct perf_event_ops *ops, 789 u64 file_offset) 790 { 791 struct perf_sample sample; 792 int ret; 793 794 if (session->header.needs_swap && 795 perf_event__swap_ops[event->header.type]) 796 perf_event__swap_ops[event->header.type](event); 797 798 if (event->header.type >= PERF_RECORD_HEADER_MAX) 799 return -EINVAL; 800 801 hists__inc_nr_events(&session->hists, event->header.type); 802 803 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 804 return perf_session__process_user_event(session, event, ops, file_offset); 805 806 /* 807 * For all kernel events we get the sample data 808 */ 809 perf_session__parse_sample(session, event, &sample); 810 811 /* Preprocess sample records - precheck callchains */ 812 if (perf_session__preprocess_sample(session, event, &sample)) 813 return 0; 814 815 if (ops->ordered_samples) { 816 ret = perf_session_queue_event(session, event, &sample, 817 file_offset); 818 if (ret != -ETIME) 819 return ret; 820 } 821 822 return perf_session_deliver_event(session, event, &sample, ops, 823 file_offset); 824 } 825 826 void perf_event_header__bswap(struct perf_event_header *self) 827 { 828 self->type = bswap_32(self->type); 829 self->misc = bswap_16(self->misc); 830 self->size = bswap_16(self->size); 831 } 832 833 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 834 { 835 struct thread *thread = perf_session__findnew(self, 0); 836 837 if (thread == NULL || thread__set_comm(thread, "swapper")) { 838 pr_err("problem inserting idle task.\n"); 839 thread = NULL; 840 } 841 842 return thread; 843 } 844 845 static void perf_session__warn_about_errors(const struct perf_session *session, 846 const struct perf_event_ops *ops) 847 { 848 if (ops->lost == perf_event__process_lost && 849 session->hists.stats.total_lost != 0) { 850 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64 851 "!\n\nCheck IO/CPU overload!\n\n", 852 session->hists.stats.total_period, 853 session->hists.stats.total_lost); 854 } 855 856 if (session->hists.stats.nr_unknown_events != 0) { 857 ui__warning("Found %u unknown events!\n\n" 858 "Is this an older tool processing a perf.data " 859 "file generated by a more recent tool?\n\n" 860 "If that is not the case, consider " 861 "reporting to linux-kernel@vger.kernel.org.\n\n", 862 session->hists.stats.nr_unknown_events); 863 } 864 865 if (session->hists.stats.nr_unknown_id != 0) { 866 ui__warning("%u samples with id not present in the header\n", 867 session->hists.stats.nr_unknown_id); 868 } 869 870 if (session->hists.stats.nr_invalid_chains != 0) { 871 ui__warning("Found invalid callchains!\n\n" 872 "%u out of %u events were discarded for this reason.\n\n" 873 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 874 session->hists.stats.nr_invalid_chains, 875 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 876 } 877 } 878 879 #define session_done() (*(volatile int *)(&session_done)) 880 volatile int session_done; 881 882 static int __perf_session__process_pipe_events(struct perf_session *self, 883 struct perf_event_ops *ops) 884 { 885 union perf_event event; 886 uint32_t size; 887 int skip = 0; 888 u64 head; 889 int err; 890 void *p; 891 892 perf_event_ops__fill_defaults(ops); 893 894 head = 0; 895 more: 896 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 897 if (err <= 0) { 898 if (err == 0) 899 goto done; 900 901 pr_err("failed to read event header\n"); 902 goto out_err; 903 } 904 905 if (self->header.needs_swap) 906 perf_event_header__bswap(&event.header); 907 908 size = event.header.size; 909 if (size == 0) 910 size = 8; 911 912 p = &event; 913 p += sizeof(struct perf_event_header); 914 915 if (size - sizeof(struct perf_event_header)) { 916 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 917 if (err <= 0) { 918 if (err == 0) { 919 pr_err("unexpected end of event stream\n"); 920 goto done; 921 } 922 923 pr_err("failed to read event data\n"); 924 goto out_err; 925 } 926 } 927 928 if (size == 0 || 929 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 930 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 931 head, event.header.size, event.header.type); 932 /* 933 * assume we lost track of the stream, check alignment, and 934 * increment a single u64 in the hope to catch on again 'soon'. 935 */ 936 if (unlikely(head & 7)) 937 head &= ~7ULL; 938 939 size = 8; 940 } 941 942 head += size; 943 944 if (skip > 0) 945 head += skip; 946 947 if (!session_done()) 948 goto more; 949 done: 950 err = 0; 951 out_err: 952 perf_session__warn_about_errors(self, ops); 953 perf_session_free_sample_buffers(self); 954 return err; 955 } 956 957 int __perf_session__process_events(struct perf_session *session, 958 u64 data_offset, u64 data_size, 959 u64 file_size, struct perf_event_ops *ops) 960 { 961 u64 head, page_offset, file_offset, file_pos, progress_next; 962 int err, mmap_prot, mmap_flags, map_idx = 0; 963 struct ui_progress *progress; 964 size_t page_size, mmap_size; 965 char *buf, *mmaps[8]; 966 union perf_event *event; 967 uint32_t size; 968 969 perf_event_ops__fill_defaults(ops); 970 971 page_size = sysconf(_SC_PAGESIZE); 972 973 page_offset = page_size * (data_offset / page_size); 974 file_offset = page_offset; 975 head = data_offset - page_offset; 976 977 if (data_offset + data_size < file_size) 978 file_size = data_offset + data_size; 979 980 progress_next = file_size / 16; 981 progress = ui_progress__new("Processing events...", file_size); 982 if (progress == NULL) 983 return -1; 984 985 mmap_size = session->mmap_window; 986 if (mmap_size > file_size) 987 mmap_size = file_size; 988 989 memset(mmaps, 0, sizeof(mmaps)); 990 991 mmap_prot = PROT_READ; 992 mmap_flags = MAP_SHARED; 993 994 if (session->header.needs_swap) { 995 mmap_prot |= PROT_WRITE; 996 mmap_flags = MAP_PRIVATE; 997 } 998 remap: 999 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1000 file_offset); 1001 if (buf == MAP_FAILED) { 1002 pr_err("failed to mmap file\n"); 1003 err = -errno; 1004 goto out_err; 1005 } 1006 mmaps[map_idx] = buf; 1007 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1008 file_pos = file_offset + head; 1009 1010 more: 1011 /* 1012 * Ensure we have enough space remaining to read 1013 * the size of the event in the headers. 1014 */ 1015 if (head + sizeof(event->header) > mmap_size) 1016 goto remap; 1017 1018 event = (union perf_event *)(buf + head); 1019 1020 if (session->header.needs_swap) 1021 perf_event_header__bswap(&event->header); 1022 1023 if (head + event->header.size > mmap_size) { 1024 if (mmaps[map_idx]) { 1025 munmap(mmaps[map_idx], mmap_size); 1026 mmaps[map_idx] = NULL; 1027 } 1028 1029 page_offset = page_size * (head / page_size); 1030 file_offset += page_offset; 1031 head -= page_offset; 1032 goto remap; 1033 } 1034 1035 size = event->header.size; 1036 1037 if (size == 0 || 1038 perf_session__process_event(session, event, ops, file_pos) < 0) { 1039 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1040 file_offset + head, event->header.size, 1041 event->header.type); 1042 /* 1043 * assume we lost track of the stream, check alignment, and 1044 * increment a single u64 in the hope to catch on again 'soon'. 1045 */ 1046 if (unlikely(head & 7)) 1047 head &= ~7ULL; 1048 1049 size = 8; 1050 } 1051 1052 head += size; 1053 file_pos += size; 1054 1055 if (file_pos >= progress_next) { 1056 progress_next += file_size / 16; 1057 ui_progress__update(progress, file_pos); 1058 } 1059 1060 if (file_pos < file_size) 1061 goto more; 1062 1063 err = 0; 1064 /* do the final flush for ordered samples */ 1065 session->ordered_samples.next_flush = ULLONG_MAX; 1066 flush_sample_queue(session, ops); 1067 out_err: 1068 ui_progress__delete(progress); 1069 perf_session__warn_about_errors(session, ops); 1070 perf_session_free_sample_buffers(session); 1071 return err; 1072 } 1073 1074 int perf_session__process_events(struct perf_session *self, 1075 struct perf_event_ops *ops) 1076 { 1077 int err; 1078 1079 if (perf_session__register_idle_thread(self) == NULL) 1080 return -ENOMEM; 1081 1082 if (!self->fd_pipe) 1083 err = __perf_session__process_events(self, 1084 self->header.data_offset, 1085 self->header.data_size, 1086 self->size, ops); 1087 else 1088 err = __perf_session__process_pipe_events(self, ops); 1089 1090 return err; 1091 } 1092 1093 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1094 { 1095 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1096 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1097 return false; 1098 } 1099 1100 return true; 1101 } 1102 1103 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 1104 const char *symbol_name, 1105 u64 addr) 1106 { 1107 char *bracket; 1108 enum map_type i; 1109 struct ref_reloc_sym *ref; 1110 1111 ref = zalloc(sizeof(struct ref_reloc_sym)); 1112 if (ref == NULL) 1113 return -ENOMEM; 1114 1115 ref->name = strdup(symbol_name); 1116 if (ref->name == NULL) { 1117 free(ref); 1118 return -ENOMEM; 1119 } 1120 1121 bracket = strchr(ref->name, ']'); 1122 if (bracket) 1123 *bracket = '\0'; 1124 1125 ref->addr = addr; 1126 1127 for (i = 0; i < MAP__NR_TYPES; ++i) { 1128 struct kmap *kmap = map__kmap(maps[i]); 1129 kmap->ref_reloc_sym = ref; 1130 } 1131 1132 return 0; 1133 } 1134 1135 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1136 { 1137 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1138 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1139 machines__fprintf_dsos(&self->machines, fp); 1140 } 1141 1142 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1143 bool with_hits) 1144 { 1145 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1146 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1147 } 1148 1149 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1150 { 1151 struct perf_evsel *pos; 1152 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1153 1154 ret += hists__fprintf_nr_events(&session->hists, fp); 1155 1156 list_for_each_entry(pos, &session->evlist->entries, node) { 1157 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1158 ret += hists__fprintf_nr_events(&pos->hists, fp); 1159 } 1160 1161 return ret; 1162 } 1163 1164 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1165 unsigned int type) 1166 { 1167 struct perf_evsel *pos; 1168 1169 list_for_each_entry(pos, &session->evlist->entries, node) { 1170 if (pos->attr.type == type) 1171 return pos; 1172 } 1173 return NULL; 1174 } 1175 1176 void perf_session__print_symbols(union perf_event *event, 1177 struct perf_sample *sample, 1178 struct perf_session *session) 1179 { 1180 struct addr_location al; 1181 const char *symname, *dsoname; 1182 struct callchain_cursor *cursor = &session->callchain_cursor; 1183 struct callchain_cursor_node *node; 1184 1185 if (perf_event__preprocess_sample(event, session, &al, sample, 1186 NULL) < 0) { 1187 error("problem processing %d event, skipping it.\n", 1188 event->header.type); 1189 return; 1190 } 1191 1192 if (symbol_conf.use_callchain && sample->callchain) { 1193 1194 if (perf_session__resolve_callchain(session, al.thread, 1195 sample->callchain, NULL) != 0) { 1196 if (verbose) 1197 error("Failed to resolve callchain. Skipping\n"); 1198 return; 1199 } 1200 callchain_cursor_commit(cursor); 1201 1202 while (1) { 1203 node = callchain_cursor_current(cursor); 1204 if (!node) 1205 break; 1206 1207 if (node->sym && node->sym->name) 1208 symname = node->sym->name; 1209 else 1210 symname = ""; 1211 1212 if (node->map && node->map->dso && node->map->dso->name) 1213 dsoname = node->map->dso->name; 1214 else 1215 dsoname = ""; 1216 1217 printf("\t%16" PRIx64 " %s (%s)\n", node->ip, symname, dsoname); 1218 1219 callchain_cursor_advance(cursor); 1220 } 1221 1222 } else { 1223 if (al.sym && al.sym->name) 1224 symname = al.sym->name; 1225 else 1226 symname = ""; 1227 1228 if (al.map && al.map->dso && al.map->dso->name) 1229 dsoname = al.map->dso->name; 1230 else 1231 dsoname = ""; 1232 1233 printf("%16" PRIx64 " %s (%s)", al.addr, symname, dsoname); 1234 } 1235 } 1236