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