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 "session.h" 11 #include "sort.h" 12 #include "util.h" 13 14 static int perf_session__open(struct perf_session *self, bool force) 15 { 16 struct stat input_stat; 17 18 if (!strcmp(self->filename, "-")) { 19 self->fd_pipe = true; 20 self->fd = STDIN_FILENO; 21 22 if (perf_header__read(self, self->fd) < 0) 23 pr_err("incompatible file format"); 24 25 return 0; 26 } 27 28 self->fd = open(self->filename, O_RDONLY); 29 if (self->fd < 0) { 30 int err = errno; 31 32 pr_err("failed to open %s: %s", self->filename, strerror(err)); 33 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 34 pr_err(" (try 'perf record' first)"); 35 pr_err("\n"); 36 return -errno; 37 } 38 39 if (fstat(self->fd, &input_stat) < 0) 40 goto out_close; 41 42 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 43 pr_err("file %s not owned by current user or root\n", 44 self->filename); 45 goto out_close; 46 } 47 48 if (!input_stat.st_size) { 49 pr_info("zero-sized file (%s), nothing to do!\n", 50 self->filename); 51 goto out_close; 52 } 53 54 if (perf_header__read(self, self->fd) < 0) { 55 pr_err("incompatible file format"); 56 goto out_close; 57 } 58 59 self->size = input_stat.st_size; 60 return 0; 61 62 out_close: 63 close(self->fd); 64 self->fd = -1; 65 return -1; 66 } 67 68 void perf_session__update_sample_type(struct perf_session *self) 69 { 70 self->sample_type = perf_header__sample_type(&self->header); 71 } 72 73 int perf_session__create_kernel_maps(struct perf_session *self) 74 { 75 int ret = machine__create_kernel_maps(&self->host_machine); 76 77 if (ret >= 0) 78 ret = machines__create_guest_kernel_maps(&self->machines); 79 return ret; 80 } 81 82 static void perf_session__destroy_kernel_maps(struct perf_session *self) 83 { 84 machine__destroy_kernel_maps(&self->host_machine); 85 machines__destroy_guest_kernel_maps(&self->machines); 86 } 87 88 struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe) 89 { 90 size_t len = filename ? strlen(filename) + 1 : 0; 91 struct perf_session *self = zalloc(sizeof(*self) + len); 92 93 if (self == NULL) 94 goto out; 95 96 if (perf_header__init(&self->header) < 0) 97 goto out_free; 98 99 memcpy(self->filename, filename, len); 100 self->threads = RB_ROOT; 101 INIT_LIST_HEAD(&self->dead_threads); 102 self->hists_tree = RB_ROOT; 103 self->last_match = NULL; 104 /* 105 * On 64bit we can mmap the data file in one go. No need for tiny mmap 106 * slices. On 32bit we use 32MB. 107 */ 108 #if BITS_PER_LONG == 64 109 self->mmap_window = ULLONG_MAX; 110 #else 111 self->mmap_window = 32 * 1024 * 1024ULL; 112 #endif 113 self->machines = RB_ROOT; 114 self->repipe = repipe; 115 INIT_LIST_HEAD(&self->ordered_samples.samples); 116 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 117 118 if (mode == O_RDONLY) { 119 if (perf_session__open(self, force) < 0) 120 goto out_delete; 121 } else if (mode == O_WRONLY) { 122 /* 123 * In O_RDONLY mode this will be performed when reading the 124 * kernel MMAP event, in event__process_mmap(). 125 */ 126 if (perf_session__create_kernel_maps(self) < 0) 127 goto out_delete; 128 } 129 130 perf_session__update_sample_type(self); 131 out: 132 return self; 133 out_free: 134 free(self); 135 return NULL; 136 out_delete: 137 perf_session__delete(self); 138 return NULL; 139 } 140 141 static void perf_session__delete_dead_threads(struct perf_session *self) 142 { 143 struct thread *n, *t; 144 145 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 146 list_del(&t->node); 147 thread__delete(t); 148 } 149 } 150 151 static void perf_session__delete_threads(struct perf_session *self) 152 { 153 struct rb_node *nd = rb_first(&self->threads); 154 155 while (nd) { 156 struct thread *t = rb_entry(nd, struct thread, rb_node); 157 158 rb_erase(&t->rb_node, &self->threads); 159 nd = rb_next(nd); 160 thread__delete(t); 161 } 162 } 163 164 void perf_session__delete(struct perf_session *self) 165 { 166 perf_header__exit(&self->header); 167 perf_session__destroy_kernel_maps(self); 168 perf_session__delete_dead_threads(self); 169 perf_session__delete_threads(self); 170 machine__exit(&self->host_machine); 171 close(self->fd); 172 free(self); 173 } 174 175 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 176 { 177 self->last_match = NULL; 178 rb_erase(&th->rb_node, &self->threads); 179 /* 180 * We may have references to this thread, for instance in some hist_entry 181 * instances, so just move them to a separate list. 182 */ 183 list_add_tail(&th->node, &self->dead_threads); 184 } 185 186 static bool symbol__match_parent_regex(struct symbol *sym) 187 { 188 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 189 return 1; 190 191 return 0; 192 } 193 194 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self, 195 struct thread *thread, 196 struct ip_callchain *chain, 197 struct symbol **parent) 198 { 199 u8 cpumode = PERF_RECORD_MISC_USER; 200 unsigned int i; 201 struct map_symbol *syms = calloc(chain->nr, sizeof(*syms)); 202 203 if (!syms) 204 return NULL; 205 206 for (i = 0; i < chain->nr; i++) { 207 u64 ip = chain->ips[i]; 208 struct addr_location al; 209 210 if (ip >= PERF_CONTEXT_MAX) { 211 switch (ip) { 212 case PERF_CONTEXT_HV: 213 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 214 case PERF_CONTEXT_KERNEL: 215 cpumode = PERF_RECORD_MISC_KERNEL; break; 216 case PERF_CONTEXT_USER: 217 cpumode = PERF_RECORD_MISC_USER; break; 218 default: 219 break; 220 } 221 continue; 222 } 223 224 al.filtered = false; 225 thread__find_addr_location(thread, self, cpumode, 226 MAP__FUNCTION, thread->pid, ip, &al, NULL); 227 if (al.sym != NULL) { 228 if (sort__has_parent && !*parent && 229 symbol__match_parent_regex(al.sym)) 230 *parent = al.sym; 231 if (!symbol_conf.use_callchain) 232 break; 233 syms[i].map = al.map; 234 syms[i].sym = al.sym; 235 } 236 } 237 238 return syms; 239 } 240 241 static int process_event_stub(event_t *event __used, 242 struct perf_session *session __used) 243 { 244 dump_printf(": unhandled!\n"); 245 return 0; 246 } 247 248 static int process_finished_round_stub(event_t *event __used, 249 struct perf_session *session __used, 250 struct perf_event_ops *ops __used) 251 { 252 dump_printf(": unhandled!\n"); 253 return 0; 254 } 255 256 static int process_finished_round(event_t *event, 257 struct perf_session *session, 258 struct perf_event_ops *ops); 259 260 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 261 { 262 if (handler->sample == NULL) 263 handler->sample = process_event_stub; 264 if (handler->mmap == NULL) 265 handler->mmap = process_event_stub; 266 if (handler->comm == NULL) 267 handler->comm = process_event_stub; 268 if (handler->fork == NULL) 269 handler->fork = process_event_stub; 270 if (handler->exit == NULL) 271 handler->exit = process_event_stub; 272 if (handler->lost == NULL) 273 handler->lost = event__process_lost; 274 if (handler->read == NULL) 275 handler->read = process_event_stub; 276 if (handler->throttle == NULL) 277 handler->throttle = process_event_stub; 278 if (handler->unthrottle == NULL) 279 handler->unthrottle = process_event_stub; 280 if (handler->attr == NULL) 281 handler->attr = process_event_stub; 282 if (handler->event_type == NULL) 283 handler->event_type = process_event_stub; 284 if (handler->tracing_data == NULL) 285 handler->tracing_data = process_event_stub; 286 if (handler->build_id == NULL) 287 handler->build_id = process_event_stub; 288 if (handler->finished_round == NULL) { 289 if (handler->ordered_samples) 290 handler->finished_round = process_finished_round; 291 else 292 handler->finished_round = process_finished_round_stub; 293 } 294 } 295 296 void mem_bswap_64(void *src, int byte_size) 297 { 298 u64 *m = src; 299 300 while (byte_size > 0) { 301 *m = bswap_64(*m); 302 byte_size -= sizeof(u64); 303 ++m; 304 } 305 } 306 307 static void event__all64_swap(event_t *self) 308 { 309 struct perf_event_header *hdr = &self->header; 310 mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr)); 311 } 312 313 static void event__comm_swap(event_t *self) 314 { 315 self->comm.pid = bswap_32(self->comm.pid); 316 self->comm.tid = bswap_32(self->comm.tid); 317 } 318 319 static void event__mmap_swap(event_t *self) 320 { 321 self->mmap.pid = bswap_32(self->mmap.pid); 322 self->mmap.tid = bswap_32(self->mmap.tid); 323 self->mmap.start = bswap_64(self->mmap.start); 324 self->mmap.len = bswap_64(self->mmap.len); 325 self->mmap.pgoff = bswap_64(self->mmap.pgoff); 326 } 327 328 static void event__task_swap(event_t *self) 329 { 330 self->fork.pid = bswap_32(self->fork.pid); 331 self->fork.tid = bswap_32(self->fork.tid); 332 self->fork.ppid = bswap_32(self->fork.ppid); 333 self->fork.ptid = bswap_32(self->fork.ptid); 334 self->fork.time = bswap_64(self->fork.time); 335 } 336 337 static void event__read_swap(event_t *self) 338 { 339 self->read.pid = bswap_32(self->read.pid); 340 self->read.tid = bswap_32(self->read.tid); 341 self->read.value = bswap_64(self->read.value); 342 self->read.time_enabled = bswap_64(self->read.time_enabled); 343 self->read.time_running = bswap_64(self->read.time_running); 344 self->read.id = bswap_64(self->read.id); 345 } 346 347 static void event__attr_swap(event_t *self) 348 { 349 size_t size; 350 351 self->attr.attr.type = bswap_32(self->attr.attr.type); 352 self->attr.attr.size = bswap_32(self->attr.attr.size); 353 self->attr.attr.config = bswap_64(self->attr.attr.config); 354 self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period); 355 self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type); 356 self->attr.attr.read_format = bswap_64(self->attr.attr.read_format); 357 self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events); 358 self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type); 359 self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr); 360 self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len); 361 362 size = self->header.size; 363 size -= (void *)&self->attr.id - (void *)self; 364 mem_bswap_64(self->attr.id, size); 365 } 366 367 static void event__event_type_swap(event_t *self) 368 { 369 self->event_type.event_type.event_id = 370 bswap_64(self->event_type.event_type.event_id); 371 } 372 373 static void event__tracing_data_swap(event_t *self) 374 { 375 self->tracing_data.size = bswap_32(self->tracing_data.size); 376 } 377 378 typedef void (*event__swap_op)(event_t *self); 379 380 static event__swap_op event__swap_ops[] = { 381 [PERF_RECORD_MMAP] = event__mmap_swap, 382 [PERF_RECORD_COMM] = event__comm_swap, 383 [PERF_RECORD_FORK] = event__task_swap, 384 [PERF_RECORD_EXIT] = event__task_swap, 385 [PERF_RECORD_LOST] = event__all64_swap, 386 [PERF_RECORD_READ] = event__read_swap, 387 [PERF_RECORD_SAMPLE] = event__all64_swap, 388 [PERF_RECORD_HEADER_ATTR] = event__attr_swap, 389 [PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap, 390 [PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap, 391 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 392 [PERF_RECORD_HEADER_MAX] = NULL, 393 }; 394 395 struct sample_queue { 396 u64 timestamp; 397 event_t *event; 398 struct list_head list; 399 }; 400 401 static void flush_sample_queue(struct perf_session *s, 402 struct perf_event_ops *ops) 403 { 404 struct ordered_samples *os = &s->ordered_samples; 405 struct list_head *head = &os->samples; 406 struct sample_queue *tmp, *iter; 407 u64 limit = os->next_flush; 408 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 409 410 if (!ops->ordered_samples || !limit) 411 return; 412 413 list_for_each_entry_safe(iter, tmp, head, list) { 414 if (iter->timestamp > limit) 415 break; 416 417 ops->sample(iter->event, s); 418 419 os->last_flush = iter->timestamp; 420 list_del(&iter->list); 421 free(iter->event); 422 free(iter); 423 } 424 425 if (list_empty(head)) { 426 os->last_sample = NULL; 427 } else if (last_ts <= limit) { 428 os->last_sample = 429 list_entry(head->prev, struct sample_queue, list); 430 } 431 } 432 433 /* 434 * When perf record finishes a pass on every buffers, it records this pseudo 435 * event. 436 * We record the max timestamp t found in the pass n. 437 * Assuming these timestamps are monotonic across cpus, we know that if 438 * a buffer still has events with timestamps below t, they will be all 439 * available and then read in the pass n + 1. 440 * Hence when we start to read the pass n + 2, we can safely flush every 441 * events with timestamps below t. 442 * 443 * ============ PASS n ================= 444 * CPU 0 | CPU 1 445 * | 446 * cnt1 timestamps | cnt2 timestamps 447 * 1 | 2 448 * 2 | 3 449 * - | 4 <--- max recorded 450 * 451 * ============ PASS n + 1 ============== 452 * CPU 0 | CPU 1 453 * | 454 * cnt1 timestamps | cnt2 timestamps 455 * 3 | 5 456 * 4 | 6 457 * 5 | 7 <---- max recorded 458 * 459 * Flush every events below timestamp 4 460 * 461 * ============ PASS n + 2 ============== 462 * CPU 0 | CPU 1 463 * | 464 * cnt1 timestamps | cnt2 timestamps 465 * 6 | 8 466 * 7 | 9 467 * - | 10 468 * 469 * Flush every events below timestamp 7 470 * etc... 471 */ 472 static int process_finished_round(event_t *event __used, 473 struct perf_session *session, 474 struct perf_event_ops *ops) 475 { 476 flush_sample_queue(session, ops); 477 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 478 479 return 0; 480 } 481 482 /* The queue is ordered by time */ 483 static void __queue_sample_event(struct sample_queue *new, 484 struct perf_session *s) 485 { 486 struct ordered_samples *os = &s->ordered_samples; 487 struct sample_queue *sample = os->last_sample; 488 u64 timestamp = new->timestamp; 489 struct list_head *p; 490 491 os->last_sample = new; 492 493 if (!sample) { 494 list_add(&new->list, &os->samples); 495 os->max_timestamp = timestamp; 496 return; 497 } 498 499 /* 500 * last_sample might point to some random place in the list as it's 501 * the last queued event. We expect that the new event is close to 502 * this. 503 */ 504 if (sample->timestamp <= timestamp) { 505 while (sample->timestamp <= timestamp) { 506 p = sample->list.next; 507 if (p == &os->samples) { 508 list_add_tail(&new->list, &os->samples); 509 os->max_timestamp = timestamp; 510 return; 511 } 512 sample = list_entry(p, struct sample_queue, list); 513 } 514 list_add_tail(&new->list, &sample->list); 515 } else { 516 while (sample->timestamp > timestamp) { 517 p = sample->list.prev; 518 if (p == &os->samples) { 519 list_add(&new->list, &os->samples); 520 return; 521 } 522 sample = list_entry(p, struct sample_queue, list); 523 } 524 list_add(&new->list, &sample->list); 525 } 526 } 527 528 static int queue_sample_event(event_t *event, struct sample_data *data, 529 struct perf_session *s) 530 { 531 u64 timestamp = data->time; 532 struct sample_queue *new; 533 534 535 if (timestamp < s->ordered_samples.last_flush) { 536 printf("Warning: Timestamp below last timeslice flush\n"); 537 return -EINVAL; 538 } 539 540 new = malloc(sizeof(*new)); 541 if (!new) 542 return -ENOMEM; 543 544 new->timestamp = timestamp; 545 546 new->event = malloc(event->header.size); 547 if (!new->event) { 548 free(new); 549 return -ENOMEM; 550 } 551 552 memcpy(new->event, event, event->header.size); 553 554 __queue_sample_event(new, s); 555 556 return 0; 557 } 558 559 static int perf_session__process_sample(event_t *event, struct perf_session *s, 560 struct perf_event_ops *ops) 561 { 562 struct sample_data data; 563 564 if (!ops->ordered_samples) 565 return ops->sample(event, s); 566 567 bzero(&data, sizeof(struct sample_data)); 568 event__parse_sample(event, s->sample_type, &data); 569 570 queue_sample_event(event, &data, s); 571 572 return 0; 573 } 574 575 static int perf_session__process_event(struct perf_session *self, 576 event_t *event, 577 struct perf_event_ops *ops, 578 u64 file_offset) 579 { 580 trace_event(event); 581 582 if (event->header.type < PERF_RECORD_HEADER_MAX) { 583 dump_printf("%#Lx [%#x]: PERF_RECORD_%s", 584 file_offset, event->header.size, 585 event__name[event->header.type]); 586 hists__inc_nr_events(&self->hists, event->header.type); 587 } 588 589 if (self->header.needs_swap && event__swap_ops[event->header.type]) 590 event__swap_ops[event->header.type](event); 591 592 switch (event->header.type) { 593 case PERF_RECORD_SAMPLE: 594 return perf_session__process_sample(event, self, ops); 595 case PERF_RECORD_MMAP: 596 return ops->mmap(event, self); 597 case PERF_RECORD_COMM: 598 return ops->comm(event, self); 599 case PERF_RECORD_FORK: 600 return ops->fork(event, self); 601 case PERF_RECORD_EXIT: 602 return ops->exit(event, self); 603 case PERF_RECORD_LOST: 604 return ops->lost(event, self); 605 case PERF_RECORD_READ: 606 return ops->read(event, self); 607 case PERF_RECORD_THROTTLE: 608 return ops->throttle(event, self); 609 case PERF_RECORD_UNTHROTTLE: 610 return ops->unthrottle(event, self); 611 case PERF_RECORD_HEADER_ATTR: 612 return ops->attr(event, self); 613 case PERF_RECORD_HEADER_EVENT_TYPE: 614 return ops->event_type(event, self); 615 case PERF_RECORD_HEADER_TRACING_DATA: 616 /* setup for reading amidst mmap */ 617 lseek(self->fd, file_offset, SEEK_SET); 618 return ops->tracing_data(event, self); 619 case PERF_RECORD_HEADER_BUILD_ID: 620 return ops->build_id(event, self); 621 case PERF_RECORD_FINISHED_ROUND: 622 return ops->finished_round(event, self, ops); 623 default: 624 ++self->hists.stats.nr_unknown_events; 625 return -1; 626 } 627 } 628 629 void perf_event_header__bswap(struct perf_event_header *self) 630 { 631 self->type = bswap_32(self->type); 632 self->misc = bswap_16(self->misc); 633 self->size = bswap_16(self->size); 634 } 635 636 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 637 { 638 struct thread *thread = perf_session__findnew(self, 0); 639 640 if (thread == NULL || thread__set_comm(thread, "swapper")) { 641 pr_err("problem inserting idle task.\n"); 642 thread = NULL; 643 } 644 645 return thread; 646 } 647 648 int do_read(int fd, void *buf, size_t size) 649 { 650 void *buf_start = buf; 651 652 while (size) { 653 int ret = read(fd, buf, size); 654 655 if (ret <= 0) 656 return ret; 657 658 size -= ret; 659 buf += ret; 660 } 661 662 return buf - buf_start; 663 } 664 665 #define session_done() (*(volatile int *)(&session_done)) 666 volatile int session_done; 667 668 static int __perf_session__process_pipe_events(struct perf_session *self, 669 struct perf_event_ops *ops) 670 { 671 event_t event; 672 uint32_t size; 673 int skip = 0; 674 u64 head; 675 int err; 676 void *p; 677 678 perf_event_ops__fill_defaults(ops); 679 680 head = 0; 681 more: 682 err = do_read(self->fd, &event, sizeof(struct perf_event_header)); 683 if (err <= 0) { 684 if (err == 0) 685 goto done; 686 687 pr_err("failed to read event header\n"); 688 goto out_err; 689 } 690 691 if (self->header.needs_swap) 692 perf_event_header__bswap(&event.header); 693 694 size = event.header.size; 695 if (size == 0) 696 size = 8; 697 698 p = &event; 699 p += sizeof(struct perf_event_header); 700 701 if (size - sizeof(struct perf_event_header)) { 702 err = do_read(self->fd, p, 703 size - sizeof(struct perf_event_header)); 704 if (err <= 0) { 705 if (err == 0) { 706 pr_err("unexpected end of event stream\n"); 707 goto done; 708 } 709 710 pr_err("failed to read event data\n"); 711 goto out_err; 712 } 713 } 714 715 if (size == 0 || 716 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 717 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", 718 head, event.header.size, event.header.type); 719 /* 720 * assume we lost track of the stream, check alignment, and 721 * increment a single u64 in the hope to catch on again 'soon'. 722 */ 723 if (unlikely(head & 7)) 724 head &= ~7ULL; 725 726 size = 8; 727 } 728 729 head += size; 730 731 dump_printf("\n%#Lx [%#x]: event: %d\n", 732 head, event.header.size, event.header.type); 733 734 if (skip > 0) 735 head += skip; 736 737 if (!session_done()) 738 goto more; 739 done: 740 err = 0; 741 out_err: 742 return err; 743 } 744 745 int __perf_session__process_events(struct perf_session *session, 746 u64 data_offset, u64 data_size, 747 u64 file_size, struct perf_event_ops *ops) 748 { 749 u64 head, page_offset, file_offset, file_pos, progress_next; 750 int err, mmap_prot, mmap_flags; 751 struct ui_progress *progress; 752 size_t page_size, mmap_size; 753 event_t *event; 754 uint32_t size; 755 char *buf; 756 757 perf_event_ops__fill_defaults(ops); 758 759 page_size = sysconf(_SC_PAGESIZE); 760 761 page_offset = page_size * (data_offset / page_size); 762 file_offset = page_offset; 763 head = data_offset - page_offset; 764 765 if (data_offset + data_size < file_size) 766 file_size = data_offset + data_size; 767 768 progress_next = file_size / 16; 769 progress = ui_progress__new("Processing events...", file_size); 770 if (progress == NULL) 771 return -1; 772 773 mmap_size = session->mmap_window; 774 if (mmap_size > file_size) 775 mmap_size = file_size; 776 777 mmap_prot = PROT_READ; 778 mmap_flags = MAP_SHARED; 779 780 if (session->header.needs_swap) { 781 mmap_prot |= PROT_WRITE; 782 mmap_flags = MAP_PRIVATE; 783 } 784 remap: 785 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 786 file_offset); 787 if (buf == MAP_FAILED) { 788 pr_err("failed to mmap file\n"); 789 err = -errno; 790 goto out_err; 791 } 792 file_pos = file_offset + head; 793 794 more: 795 event = (event_t *)(buf + head); 796 797 if (session->header.needs_swap) 798 perf_event_header__bswap(&event->header); 799 size = event->header.size; 800 if (size == 0) 801 size = 8; 802 803 if (head + event->header.size >= mmap_size) { 804 int munmap_ret; 805 806 munmap_ret = munmap(buf, mmap_size); 807 assert(munmap_ret == 0); 808 809 page_offset = page_size * (head / page_size); 810 file_offset += page_offset; 811 head -= page_offset; 812 goto remap; 813 } 814 815 size = event->header.size; 816 817 dump_printf("\n%#Lx [%#x]: event: %d\n", 818 file_pos, event->header.size, event->header.type); 819 820 if (size == 0 || 821 perf_session__process_event(session, event, ops, file_pos) < 0) { 822 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", 823 file_offset + head, event->header.size, 824 event->header.type); 825 /* 826 * assume we lost track of the stream, check alignment, and 827 * increment a single u64 in the hope to catch on again 'soon'. 828 */ 829 if (unlikely(head & 7)) 830 head &= ~7ULL; 831 832 size = 8; 833 } 834 835 head += size; 836 file_pos += size; 837 838 if (file_pos >= progress_next) { 839 progress_next += file_size / 16; 840 ui_progress__update(progress, file_pos); 841 } 842 843 if (file_pos < file_size) 844 goto more; 845 846 err = 0; 847 /* do the final flush for ordered samples */ 848 session->ordered_samples.next_flush = ULLONG_MAX; 849 flush_sample_queue(session, ops); 850 out_err: 851 ui_progress__delete(progress); 852 853 if (ops->lost == event__process_lost && 854 session->hists.stats.total_lost != 0) { 855 ui__warning("Processed %Lu events and LOST %Lu!\n\n" 856 "Check IO/CPU overload!\n\n", 857 session->hists.stats.total_period, 858 session->hists.stats.total_lost); 859 } 860 861 if (session->hists.stats.nr_unknown_events != 0) { 862 ui__warning("Found %u unknown events!\n\n" 863 "Is this an older tool processing a perf.data " 864 "file generated by a more recent tool?\n\n" 865 "If that is not the case, consider " 866 "reporting to linux-kernel@vger.kernel.org.\n\n", 867 session->hists.stats.nr_unknown_events); 868 } 869 870 return err; 871 } 872 873 int perf_session__process_events(struct perf_session *self, 874 struct perf_event_ops *ops) 875 { 876 int err; 877 878 if (perf_session__register_idle_thread(self) == NULL) 879 return -ENOMEM; 880 881 if (!self->fd_pipe) 882 err = __perf_session__process_events(self, 883 self->header.data_offset, 884 self->header.data_size, 885 self->size, ops); 886 else 887 err = __perf_session__process_pipe_events(self, ops); 888 889 return err; 890 } 891 892 bool perf_session__has_traces(struct perf_session *self, const char *msg) 893 { 894 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 895 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 896 return false; 897 } 898 899 return true; 900 } 901 902 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 903 const char *symbol_name, 904 u64 addr) 905 { 906 char *bracket; 907 enum map_type i; 908 struct ref_reloc_sym *ref; 909 910 ref = zalloc(sizeof(struct ref_reloc_sym)); 911 if (ref == NULL) 912 return -ENOMEM; 913 914 ref->name = strdup(symbol_name); 915 if (ref->name == NULL) { 916 free(ref); 917 return -ENOMEM; 918 } 919 920 bracket = strchr(ref->name, ']'); 921 if (bracket) 922 *bracket = '\0'; 923 924 ref->addr = addr; 925 926 for (i = 0; i < MAP__NR_TYPES; ++i) { 927 struct kmap *kmap = map__kmap(maps[i]); 928 kmap->ref_reloc_sym = ref; 929 } 930 931 return 0; 932 } 933 934 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 935 { 936 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 937 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 938 machines__fprintf_dsos(&self->machines, fp); 939 } 940 941 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 942 bool with_hits) 943 { 944 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 945 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 946 } 947