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 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 117 INIT_LIST_HEAD(&self->ordered_samples.to_free); 118 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 119 120 if (mode == O_RDONLY) { 121 if (perf_session__open(self, force) < 0) 122 goto out_delete; 123 } else if (mode == O_WRONLY) { 124 /* 125 * In O_RDONLY mode this will be performed when reading the 126 * kernel MMAP event, in event__process_mmap(). 127 */ 128 if (perf_session__create_kernel_maps(self) < 0) 129 goto out_delete; 130 } 131 132 perf_session__update_sample_type(self); 133 out: 134 return self; 135 out_free: 136 free(self); 137 return NULL; 138 out_delete: 139 perf_session__delete(self); 140 return NULL; 141 } 142 143 static void perf_session__delete_dead_threads(struct perf_session *self) 144 { 145 struct thread *n, *t; 146 147 list_for_each_entry_safe(t, n, &self->dead_threads, node) { 148 list_del(&t->node); 149 thread__delete(t); 150 } 151 } 152 153 static void perf_session__delete_threads(struct perf_session *self) 154 { 155 struct rb_node *nd = rb_first(&self->threads); 156 157 while (nd) { 158 struct thread *t = rb_entry(nd, struct thread, rb_node); 159 160 rb_erase(&t->rb_node, &self->threads); 161 nd = rb_next(nd); 162 thread__delete(t); 163 } 164 } 165 166 void perf_session__delete(struct perf_session *self) 167 { 168 perf_header__exit(&self->header); 169 perf_session__destroy_kernel_maps(self); 170 perf_session__delete_dead_threads(self); 171 perf_session__delete_threads(self); 172 machine__exit(&self->host_machine); 173 close(self->fd); 174 free(self); 175 } 176 177 void perf_session__remove_thread(struct perf_session *self, struct thread *th) 178 { 179 self->last_match = NULL; 180 rb_erase(&th->rb_node, &self->threads); 181 /* 182 * We may have references to this thread, for instance in some hist_entry 183 * instances, so just move them to a separate list. 184 */ 185 list_add_tail(&th->node, &self->dead_threads); 186 } 187 188 static bool symbol__match_parent_regex(struct symbol *sym) 189 { 190 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 191 return 1; 192 193 return 0; 194 } 195 196 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self, 197 struct thread *thread, 198 struct ip_callchain *chain, 199 struct symbol **parent) 200 { 201 u8 cpumode = PERF_RECORD_MISC_USER; 202 unsigned int i; 203 struct map_symbol *syms = calloc(chain->nr, sizeof(*syms)); 204 205 if (!syms) 206 return NULL; 207 208 for (i = 0; i < chain->nr; i++) { 209 u64 ip = chain->ips[i]; 210 struct addr_location al; 211 212 if (ip >= PERF_CONTEXT_MAX) { 213 switch (ip) { 214 case PERF_CONTEXT_HV: 215 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 216 case PERF_CONTEXT_KERNEL: 217 cpumode = PERF_RECORD_MISC_KERNEL; break; 218 case PERF_CONTEXT_USER: 219 cpumode = PERF_RECORD_MISC_USER; break; 220 default: 221 break; 222 } 223 continue; 224 } 225 226 al.filtered = false; 227 thread__find_addr_location(thread, self, cpumode, 228 MAP__FUNCTION, thread->pid, ip, &al, NULL); 229 if (al.sym != NULL) { 230 if (sort__has_parent && !*parent && 231 symbol__match_parent_regex(al.sym)) 232 *parent = al.sym; 233 if (!symbol_conf.use_callchain) 234 break; 235 syms[i].map = al.map; 236 syms[i].sym = al.sym; 237 } 238 } 239 240 return syms; 241 } 242 243 static int process_event_stub(event_t *event __used, 244 struct perf_session *session __used) 245 { 246 dump_printf(": unhandled!\n"); 247 return 0; 248 } 249 250 static int process_finished_round_stub(event_t *event __used, 251 struct perf_session *session __used, 252 struct perf_event_ops *ops __used) 253 { 254 dump_printf(": unhandled!\n"); 255 return 0; 256 } 257 258 static int process_finished_round(event_t *event, 259 struct perf_session *session, 260 struct perf_event_ops *ops); 261 262 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) 263 { 264 if (handler->sample == NULL) 265 handler->sample = process_event_stub; 266 if (handler->mmap == NULL) 267 handler->mmap = process_event_stub; 268 if (handler->comm == NULL) 269 handler->comm = process_event_stub; 270 if (handler->fork == NULL) 271 handler->fork = process_event_stub; 272 if (handler->exit == NULL) 273 handler->exit = process_event_stub; 274 if (handler->lost == NULL) 275 handler->lost = event__process_lost; 276 if (handler->read == NULL) 277 handler->read = process_event_stub; 278 if (handler->throttle == NULL) 279 handler->throttle = process_event_stub; 280 if (handler->unthrottle == NULL) 281 handler->unthrottle = process_event_stub; 282 if (handler->attr == NULL) 283 handler->attr = process_event_stub; 284 if (handler->event_type == NULL) 285 handler->event_type = process_event_stub; 286 if (handler->tracing_data == NULL) 287 handler->tracing_data = process_event_stub; 288 if (handler->build_id == NULL) 289 handler->build_id = process_event_stub; 290 if (handler->finished_round == NULL) { 291 if (handler->ordered_samples) 292 handler->finished_round = process_finished_round; 293 else 294 handler->finished_round = process_finished_round_stub; 295 } 296 } 297 298 void mem_bswap_64(void *src, int byte_size) 299 { 300 u64 *m = src; 301 302 while (byte_size > 0) { 303 *m = bswap_64(*m); 304 byte_size -= sizeof(u64); 305 ++m; 306 } 307 } 308 309 static void event__all64_swap(event_t *self) 310 { 311 struct perf_event_header *hdr = &self->header; 312 mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr)); 313 } 314 315 static void event__comm_swap(event_t *self) 316 { 317 self->comm.pid = bswap_32(self->comm.pid); 318 self->comm.tid = bswap_32(self->comm.tid); 319 } 320 321 static void event__mmap_swap(event_t *self) 322 { 323 self->mmap.pid = bswap_32(self->mmap.pid); 324 self->mmap.tid = bswap_32(self->mmap.tid); 325 self->mmap.start = bswap_64(self->mmap.start); 326 self->mmap.len = bswap_64(self->mmap.len); 327 self->mmap.pgoff = bswap_64(self->mmap.pgoff); 328 } 329 330 static void event__task_swap(event_t *self) 331 { 332 self->fork.pid = bswap_32(self->fork.pid); 333 self->fork.tid = bswap_32(self->fork.tid); 334 self->fork.ppid = bswap_32(self->fork.ppid); 335 self->fork.ptid = bswap_32(self->fork.ptid); 336 self->fork.time = bswap_64(self->fork.time); 337 } 338 339 static void event__read_swap(event_t *self) 340 { 341 self->read.pid = bswap_32(self->read.pid); 342 self->read.tid = bswap_32(self->read.tid); 343 self->read.value = bswap_64(self->read.value); 344 self->read.time_enabled = bswap_64(self->read.time_enabled); 345 self->read.time_running = bswap_64(self->read.time_running); 346 self->read.id = bswap_64(self->read.id); 347 } 348 349 static void event__attr_swap(event_t *self) 350 { 351 size_t size; 352 353 self->attr.attr.type = bswap_32(self->attr.attr.type); 354 self->attr.attr.size = bswap_32(self->attr.attr.size); 355 self->attr.attr.config = bswap_64(self->attr.attr.config); 356 self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period); 357 self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type); 358 self->attr.attr.read_format = bswap_64(self->attr.attr.read_format); 359 self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events); 360 self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type); 361 self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr); 362 self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len); 363 364 size = self->header.size; 365 size -= (void *)&self->attr.id - (void *)self; 366 mem_bswap_64(self->attr.id, size); 367 } 368 369 static void event__event_type_swap(event_t *self) 370 { 371 self->event_type.event_type.event_id = 372 bswap_64(self->event_type.event_type.event_id); 373 } 374 375 static void event__tracing_data_swap(event_t *self) 376 { 377 self->tracing_data.size = bswap_32(self->tracing_data.size); 378 } 379 380 typedef void (*event__swap_op)(event_t *self); 381 382 static event__swap_op event__swap_ops[] = { 383 [PERF_RECORD_MMAP] = event__mmap_swap, 384 [PERF_RECORD_COMM] = event__comm_swap, 385 [PERF_RECORD_FORK] = event__task_swap, 386 [PERF_RECORD_EXIT] = event__task_swap, 387 [PERF_RECORD_LOST] = event__all64_swap, 388 [PERF_RECORD_READ] = event__read_swap, 389 [PERF_RECORD_SAMPLE] = event__all64_swap, 390 [PERF_RECORD_HEADER_ATTR] = event__attr_swap, 391 [PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap, 392 [PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap, 393 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 394 [PERF_RECORD_HEADER_MAX] = NULL, 395 }; 396 397 struct sample_queue { 398 u64 timestamp; 399 event_t *event; 400 struct list_head list; 401 }; 402 403 static void perf_session_free_sample_buffers(struct perf_session *session) 404 { 405 struct ordered_samples *os = &session->ordered_samples; 406 407 while (!list_empty(&os->to_free)) { 408 struct sample_queue *sq; 409 410 sq = list_entry(os->to_free.next, struct sample_queue, list); 411 list_del(&sq->list); 412 free(sq); 413 } 414 } 415 416 static void flush_sample_queue(struct perf_session *s, 417 struct perf_event_ops *ops) 418 { 419 struct ordered_samples *os = &s->ordered_samples; 420 struct list_head *head = &os->samples; 421 struct sample_queue *tmp, *iter; 422 u64 limit = os->next_flush; 423 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 424 425 if (!ops->ordered_samples || !limit) 426 return; 427 428 list_for_each_entry_safe(iter, tmp, head, list) { 429 if (iter->timestamp > limit) 430 break; 431 432 ops->sample(iter->event, s); 433 434 os->last_flush = iter->timestamp; 435 list_del(&iter->list); 436 list_add(&iter->list, &os->sample_cache); 437 } 438 439 if (list_empty(head)) { 440 os->last_sample = NULL; 441 } else if (last_ts <= limit) { 442 os->last_sample = 443 list_entry(head->prev, struct sample_queue, list); 444 } 445 } 446 447 /* 448 * When perf record finishes a pass on every buffers, it records this pseudo 449 * event. 450 * We record the max timestamp t found in the pass n. 451 * Assuming these timestamps are monotonic across cpus, we know that if 452 * a buffer still has events with timestamps below t, they will be all 453 * available and then read in the pass n + 1. 454 * Hence when we start to read the pass n + 2, we can safely flush every 455 * events with timestamps below t. 456 * 457 * ============ PASS n ================= 458 * CPU 0 | CPU 1 459 * | 460 * cnt1 timestamps | cnt2 timestamps 461 * 1 | 2 462 * 2 | 3 463 * - | 4 <--- max recorded 464 * 465 * ============ PASS n + 1 ============== 466 * CPU 0 | CPU 1 467 * | 468 * cnt1 timestamps | cnt2 timestamps 469 * 3 | 5 470 * 4 | 6 471 * 5 | 7 <---- max recorded 472 * 473 * Flush every events below timestamp 4 474 * 475 * ============ PASS n + 2 ============== 476 * CPU 0 | CPU 1 477 * | 478 * cnt1 timestamps | cnt2 timestamps 479 * 6 | 8 480 * 7 | 9 481 * - | 10 482 * 483 * Flush every events below timestamp 7 484 * etc... 485 */ 486 static int process_finished_round(event_t *event __used, 487 struct perf_session *session, 488 struct perf_event_ops *ops) 489 { 490 flush_sample_queue(session, ops); 491 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 492 493 return 0; 494 } 495 496 /* The queue is ordered by time */ 497 static void __queue_sample_event(struct sample_queue *new, 498 struct perf_session *s) 499 { 500 struct ordered_samples *os = &s->ordered_samples; 501 struct sample_queue *sample = os->last_sample; 502 u64 timestamp = new->timestamp; 503 struct list_head *p; 504 505 os->last_sample = new; 506 507 if (!sample) { 508 list_add(&new->list, &os->samples); 509 os->max_timestamp = timestamp; 510 return; 511 } 512 513 /* 514 * last_sample might point to some random place in the list as it's 515 * the last queued event. We expect that the new event is close to 516 * this. 517 */ 518 if (sample->timestamp <= timestamp) { 519 while (sample->timestamp <= timestamp) { 520 p = sample->list.next; 521 if (p == &os->samples) { 522 list_add_tail(&new->list, &os->samples); 523 os->max_timestamp = timestamp; 524 return; 525 } 526 sample = list_entry(p, struct sample_queue, list); 527 } 528 list_add_tail(&new->list, &sample->list); 529 } else { 530 while (sample->timestamp > timestamp) { 531 p = sample->list.prev; 532 if (p == &os->samples) { 533 list_add(&new->list, &os->samples); 534 return; 535 } 536 sample = list_entry(p, struct sample_queue, list); 537 } 538 list_add(&new->list, &sample->list); 539 } 540 } 541 542 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 543 544 static int queue_sample_event(event_t *event, struct sample_data *data, 545 struct perf_session *s) 546 { 547 struct ordered_samples *os = &s->ordered_samples; 548 struct list_head *sc = &os->sample_cache; 549 u64 timestamp = data->time; 550 struct sample_queue *new; 551 552 if (timestamp < s->ordered_samples.last_flush) { 553 printf("Warning: Timestamp below last timeslice flush\n"); 554 return -EINVAL; 555 } 556 557 if (!list_empty(sc)) { 558 new = list_entry(sc->next, struct sample_queue, list); 559 list_del(&new->list); 560 } else if (os->sample_buffer) { 561 new = os->sample_buffer + os->sample_buffer_idx; 562 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 563 os->sample_buffer = NULL; 564 } else { 565 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 566 if (!os->sample_buffer) 567 return -ENOMEM; 568 list_add(&os->sample_buffer->list, &os->to_free); 569 os->sample_buffer_idx = 2; 570 new = os->sample_buffer + 1; 571 } 572 573 new->timestamp = timestamp; 574 new->event = event; 575 576 __queue_sample_event(new, s); 577 578 return 0; 579 } 580 581 static int perf_session__process_sample(event_t *event, struct perf_session *s, 582 struct perf_event_ops *ops) 583 { 584 struct sample_data data; 585 586 if (!ops->ordered_samples) 587 return ops->sample(event, s); 588 589 bzero(&data, sizeof(struct sample_data)); 590 event__parse_sample(event, s->sample_type, &data); 591 592 queue_sample_event(event, &data, s); 593 594 return 0; 595 } 596 597 static int perf_session__process_event(struct perf_session *self, 598 event_t *event, 599 struct perf_event_ops *ops, 600 u64 file_offset) 601 { 602 trace_event(event); 603 604 if (event->header.type < PERF_RECORD_HEADER_MAX) { 605 dump_printf("%#Lx [%#x]: PERF_RECORD_%s", 606 file_offset, event->header.size, 607 event__name[event->header.type]); 608 hists__inc_nr_events(&self->hists, event->header.type); 609 } 610 611 if (self->header.needs_swap && event__swap_ops[event->header.type]) 612 event__swap_ops[event->header.type](event); 613 614 switch (event->header.type) { 615 case PERF_RECORD_SAMPLE: 616 return perf_session__process_sample(event, self, ops); 617 case PERF_RECORD_MMAP: 618 return ops->mmap(event, self); 619 case PERF_RECORD_COMM: 620 return ops->comm(event, self); 621 case PERF_RECORD_FORK: 622 return ops->fork(event, self); 623 case PERF_RECORD_EXIT: 624 return ops->exit(event, self); 625 case PERF_RECORD_LOST: 626 return ops->lost(event, self); 627 case PERF_RECORD_READ: 628 return ops->read(event, self); 629 case PERF_RECORD_THROTTLE: 630 return ops->throttle(event, self); 631 case PERF_RECORD_UNTHROTTLE: 632 return ops->unthrottle(event, self); 633 case PERF_RECORD_HEADER_ATTR: 634 return ops->attr(event, self); 635 case PERF_RECORD_HEADER_EVENT_TYPE: 636 return ops->event_type(event, self); 637 case PERF_RECORD_HEADER_TRACING_DATA: 638 /* setup for reading amidst mmap */ 639 lseek(self->fd, file_offset, SEEK_SET); 640 return ops->tracing_data(event, self); 641 case PERF_RECORD_HEADER_BUILD_ID: 642 return ops->build_id(event, self); 643 case PERF_RECORD_FINISHED_ROUND: 644 return ops->finished_round(event, self, ops); 645 default: 646 ++self->hists.stats.nr_unknown_events; 647 return -1; 648 } 649 } 650 651 void perf_event_header__bswap(struct perf_event_header *self) 652 { 653 self->type = bswap_32(self->type); 654 self->misc = bswap_16(self->misc); 655 self->size = bswap_16(self->size); 656 } 657 658 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 659 { 660 struct thread *thread = perf_session__findnew(self, 0); 661 662 if (thread == NULL || thread__set_comm(thread, "swapper")) { 663 pr_err("problem inserting idle task.\n"); 664 thread = NULL; 665 } 666 667 return thread; 668 } 669 670 int do_read(int fd, void *buf, size_t size) 671 { 672 void *buf_start = buf; 673 674 while (size) { 675 int ret = read(fd, buf, size); 676 677 if (ret <= 0) 678 return ret; 679 680 size -= ret; 681 buf += ret; 682 } 683 684 return buf - buf_start; 685 } 686 687 #define session_done() (*(volatile int *)(&session_done)) 688 volatile int session_done; 689 690 static int __perf_session__process_pipe_events(struct perf_session *self, 691 struct perf_event_ops *ops) 692 { 693 event_t event; 694 uint32_t size; 695 int skip = 0; 696 u64 head; 697 int err; 698 void *p; 699 700 perf_event_ops__fill_defaults(ops); 701 702 head = 0; 703 more: 704 err = do_read(self->fd, &event, sizeof(struct perf_event_header)); 705 if (err <= 0) { 706 if (err == 0) 707 goto done; 708 709 pr_err("failed to read event header\n"); 710 goto out_err; 711 } 712 713 if (self->header.needs_swap) 714 perf_event_header__bswap(&event.header); 715 716 size = event.header.size; 717 if (size == 0) 718 size = 8; 719 720 p = &event; 721 p += sizeof(struct perf_event_header); 722 723 if (size - sizeof(struct perf_event_header)) { 724 err = do_read(self->fd, p, 725 size - sizeof(struct perf_event_header)); 726 if (err <= 0) { 727 if (err == 0) { 728 pr_err("unexpected end of event stream\n"); 729 goto done; 730 } 731 732 pr_err("failed to read event data\n"); 733 goto out_err; 734 } 735 } 736 737 if (size == 0 || 738 (skip = perf_session__process_event(self, &event, ops, head)) < 0) { 739 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", 740 head, event.header.size, event.header.type); 741 /* 742 * assume we lost track of the stream, check alignment, and 743 * increment a single u64 in the hope to catch on again 'soon'. 744 */ 745 if (unlikely(head & 7)) 746 head &= ~7ULL; 747 748 size = 8; 749 } 750 751 head += size; 752 753 dump_printf("\n%#Lx [%#x]: event: %d\n", 754 head, event.header.size, event.header.type); 755 756 if (skip > 0) 757 head += skip; 758 759 if (!session_done()) 760 goto more; 761 done: 762 err = 0; 763 out_err: 764 perf_session_free_sample_buffers(self); 765 return err; 766 } 767 768 int __perf_session__process_events(struct perf_session *session, 769 u64 data_offset, u64 data_size, 770 u64 file_size, struct perf_event_ops *ops) 771 { 772 u64 head, page_offset, file_offset, file_pos, progress_next; 773 int err, mmap_prot, mmap_flags, map_idx = 0; 774 struct ui_progress *progress; 775 size_t page_size, mmap_size; 776 char *buf, *mmaps[8]; 777 event_t *event; 778 uint32_t size; 779 780 perf_event_ops__fill_defaults(ops); 781 782 page_size = sysconf(_SC_PAGESIZE); 783 784 page_offset = page_size * (data_offset / page_size); 785 file_offset = page_offset; 786 head = data_offset - page_offset; 787 788 if (data_offset + data_size < file_size) 789 file_size = data_offset + data_size; 790 791 progress_next = file_size / 16; 792 progress = ui_progress__new("Processing events...", file_size); 793 if (progress == NULL) 794 return -1; 795 796 mmap_size = session->mmap_window; 797 if (mmap_size > file_size) 798 mmap_size = file_size; 799 800 memset(mmaps, 0, sizeof(mmaps)); 801 802 mmap_prot = PROT_READ; 803 mmap_flags = MAP_SHARED; 804 805 if (session->header.needs_swap) { 806 mmap_prot |= PROT_WRITE; 807 mmap_flags = MAP_PRIVATE; 808 } 809 remap: 810 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 811 file_offset); 812 if (buf == MAP_FAILED) { 813 pr_err("failed to mmap file\n"); 814 err = -errno; 815 goto out_err; 816 } 817 mmaps[map_idx] = buf; 818 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 819 file_pos = file_offset + head; 820 821 more: 822 event = (event_t *)(buf + head); 823 824 if (session->header.needs_swap) 825 perf_event_header__bswap(&event->header); 826 size = event->header.size; 827 if (size == 0) 828 size = 8; 829 830 if (head + event->header.size >= mmap_size) { 831 if (mmaps[map_idx]) { 832 munmap(mmaps[map_idx], mmap_size); 833 mmaps[map_idx] = NULL; 834 } 835 836 page_offset = page_size * (head / page_size); 837 file_offset += page_offset; 838 head -= page_offset; 839 goto remap; 840 } 841 842 size = event->header.size; 843 844 dump_printf("\n%#Lx [%#x]: event: %d\n", 845 file_pos, event->header.size, event->header.type); 846 847 if (size == 0 || 848 perf_session__process_event(session, event, ops, file_pos) < 0) { 849 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", 850 file_offset + head, event->header.size, 851 event->header.type); 852 /* 853 * assume we lost track of the stream, check alignment, and 854 * increment a single u64 in the hope to catch on again 'soon'. 855 */ 856 if (unlikely(head & 7)) 857 head &= ~7ULL; 858 859 size = 8; 860 } 861 862 head += size; 863 file_pos += size; 864 865 if (file_pos >= progress_next) { 866 progress_next += file_size / 16; 867 ui_progress__update(progress, file_pos); 868 } 869 870 if (file_pos < file_size) 871 goto more; 872 873 err = 0; 874 /* do the final flush for ordered samples */ 875 session->ordered_samples.next_flush = ULLONG_MAX; 876 flush_sample_queue(session, ops); 877 out_err: 878 ui_progress__delete(progress); 879 880 if (ops->lost == event__process_lost && 881 session->hists.stats.total_lost != 0) { 882 ui__warning("Processed %Lu events and LOST %Lu!\n\n" 883 "Check IO/CPU overload!\n\n", 884 session->hists.stats.total_period, 885 session->hists.stats.total_lost); 886 } 887 888 if (session->hists.stats.nr_unknown_events != 0) { 889 ui__warning("Found %u unknown events!\n\n" 890 "Is this an older tool processing a perf.data " 891 "file generated by a more recent tool?\n\n" 892 "If that is not the case, consider " 893 "reporting to linux-kernel@vger.kernel.org.\n\n", 894 session->hists.stats.nr_unknown_events); 895 } 896 897 perf_session_free_sample_buffers(session); 898 return err; 899 } 900 901 int perf_session__process_events(struct perf_session *self, 902 struct perf_event_ops *ops) 903 { 904 int err; 905 906 if (perf_session__register_idle_thread(self) == NULL) 907 return -ENOMEM; 908 909 if (!self->fd_pipe) 910 err = __perf_session__process_events(self, 911 self->header.data_offset, 912 self->header.data_size, 913 self->size, ops); 914 else 915 err = __perf_session__process_pipe_events(self, ops); 916 917 return err; 918 } 919 920 bool perf_session__has_traces(struct perf_session *self, const char *msg) 921 { 922 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 923 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 924 return false; 925 } 926 927 return true; 928 } 929 930 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps, 931 const char *symbol_name, 932 u64 addr) 933 { 934 char *bracket; 935 enum map_type i; 936 struct ref_reloc_sym *ref; 937 938 ref = zalloc(sizeof(struct ref_reloc_sym)); 939 if (ref == NULL) 940 return -ENOMEM; 941 942 ref->name = strdup(symbol_name); 943 if (ref->name == NULL) { 944 free(ref); 945 return -ENOMEM; 946 } 947 948 bracket = strchr(ref->name, ']'); 949 if (bracket) 950 *bracket = '\0'; 951 952 ref->addr = addr; 953 954 for (i = 0; i < MAP__NR_TYPES; ++i) { 955 struct kmap *kmap = map__kmap(maps[i]); 956 kmap->ref_reloc_sym = ref; 957 } 958 959 return 0; 960 } 961 962 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 963 { 964 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 965 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 966 machines__fprintf_dsos(&self->machines, fp); 967 } 968 969 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 970 bool with_hits) 971 { 972 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 973 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 974 } 975