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 "tool.h" 14 #include "sort.h" 15 #include "util.h" 16 #include "cpumap.h" 17 18 static int perf_session__open(struct perf_session *self, bool force) 19 { 20 struct stat input_stat; 21 22 if (!strcmp(self->filename, "-")) { 23 self->fd_pipe = true; 24 self->fd = STDIN_FILENO; 25 26 if (perf_session__read_header(self, self->fd) < 0) 27 pr_err("incompatible file format (rerun with -v to learn more)"); 28 29 return 0; 30 } 31 32 self->fd = open(self->filename, O_RDONLY); 33 if (self->fd < 0) { 34 int err = errno; 35 36 pr_err("failed to open %s: %s", self->filename, strerror(err)); 37 if (err == ENOENT && !strcmp(self->filename, "perf.data")) 38 pr_err(" (try 'perf record' first)"); 39 pr_err("\n"); 40 return -errno; 41 } 42 43 if (fstat(self->fd, &input_stat) < 0) 44 goto out_close; 45 46 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { 47 pr_err("file %s not owned by current user or root\n", 48 self->filename); 49 goto out_close; 50 } 51 52 if (!input_stat.st_size) { 53 pr_info("zero-sized file (%s), nothing to do!\n", 54 self->filename); 55 goto out_close; 56 } 57 58 if (perf_session__read_header(self, self->fd) < 0) { 59 pr_err("incompatible file format (rerun with -v to learn more)"); 60 goto out_close; 61 } 62 63 if (!perf_evlist__valid_sample_type(self->evlist)) { 64 pr_err("non matching sample_type"); 65 goto out_close; 66 } 67 68 if (!perf_evlist__valid_sample_id_all(self->evlist)) { 69 pr_err("non matching sample_id_all"); 70 goto out_close; 71 } 72 73 self->size = input_stat.st_size; 74 return 0; 75 76 out_close: 77 close(self->fd); 78 self->fd = -1; 79 return -1; 80 } 81 82 void perf_session__update_sample_type(struct perf_session *self) 83 { 84 self->sample_type = perf_evlist__sample_type(self->evlist); 85 self->sample_size = __perf_evsel__sample_size(self->sample_type); 86 self->sample_id_all = perf_evlist__sample_id_all(self->evlist); 87 self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist); 88 self->host_machine.id_hdr_size = self->id_hdr_size; 89 } 90 91 int perf_session__create_kernel_maps(struct perf_session *self) 92 { 93 int ret = machine__create_kernel_maps(&self->host_machine); 94 95 if (ret >= 0) 96 ret = machines__create_guest_kernel_maps(&self->machines); 97 return ret; 98 } 99 100 static void perf_session__destroy_kernel_maps(struct perf_session *self) 101 { 102 machine__destroy_kernel_maps(&self->host_machine); 103 machines__destroy_guest_kernel_maps(&self->machines); 104 } 105 106 struct perf_session *perf_session__new(const char *filename, int mode, 107 bool force, bool repipe, 108 struct perf_tool *tool) 109 { 110 struct perf_session *self; 111 struct stat st; 112 size_t len; 113 114 if (!filename || !strlen(filename)) { 115 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode)) 116 filename = "-"; 117 else 118 filename = "perf.data"; 119 } 120 121 len = strlen(filename); 122 self = zalloc(sizeof(*self) + len); 123 124 if (self == NULL) 125 goto out; 126 127 memcpy(self->filename, filename, len); 128 /* 129 * On 64bit we can mmap the data file in one go. No need for tiny mmap 130 * slices. On 32bit we use 32MB. 131 */ 132 #if BITS_PER_LONG == 64 133 self->mmap_window = ULLONG_MAX; 134 #else 135 self->mmap_window = 32 * 1024 * 1024ULL; 136 #endif 137 self->machines = RB_ROOT; 138 self->repipe = repipe; 139 INIT_LIST_HEAD(&self->ordered_samples.samples); 140 INIT_LIST_HEAD(&self->ordered_samples.sample_cache); 141 INIT_LIST_HEAD(&self->ordered_samples.to_free); 142 machine__init(&self->host_machine, "", HOST_KERNEL_ID); 143 hists__init(&self->hists); 144 145 if (mode == O_RDONLY) { 146 if (perf_session__open(self, force) < 0) 147 goto out_delete; 148 perf_session__update_sample_type(self); 149 } else if (mode == O_WRONLY) { 150 /* 151 * In O_RDONLY mode this will be performed when reading the 152 * kernel MMAP event, in perf_event__process_mmap(). 153 */ 154 if (perf_session__create_kernel_maps(self) < 0) 155 goto out_delete; 156 } 157 158 if (tool && tool->ordering_requires_timestamps && 159 tool->ordered_samples && !self->sample_id_all) { 160 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 161 tool->ordered_samples = false; 162 } 163 164 out: 165 return self; 166 out_delete: 167 perf_session__delete(self); 168 return NULL; 169 } 170 171 static void machine__delete_dead_threads(struct machine *machine) 172 { 173 struct thread *n, *t; 174 175 list_for_each_entry_safe(t, n, &machine->dead_threads, node) { 176 list_del(&t->node); 177 thread__delete(t); 178 } 179 } 180 181 static void perf_session__delete_dead_threads(struct perf_session *session) 182 { 183 machine__delete_dead_threads(&session->host_machine); 184 } 185 186 static void machine__delete_threads(struct machine *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 static void perf_session__delete_threads(struct perf_session *session) 200 { 201 machine__delete_threads(&session->host_machine); 202 } 203 204 void perf_session__delete(struct perf_session *self) 205 { 206 perf_session__destroy_kernel_maps(self); 207 perf_session__delete_dead_threads(self); 208 perf_session__delete_threads(self); 209 machine__exit(&self->host_machine); 210 close(self->fd); 211 free(self); 212 } 213 214 void machine__remove_thread(struct machine *self, struct thread *th) 215 { 216 self->last_match = NULL; 217 rb_erase(&th->rb_node, &self->threads); 218 /* 219 * We may have references to this thread, for instance in some hist_entry 220 * instances, so just move them to a separate list. 221 */ 222 list_add_tail(&th->node, &self->dead_threads); 223 } 224 225 static bool symbol__match_parent_regex(struct symbol *sym) 226 { 227 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 228 return 1; 229 230 return 0; 231 } 232 233 static const u8 cpumodes[] = { 234 PERF_RECORD_MISC_USER, 235 PERF_RECORD_MISC_KERNEL, 236 PERF_RECORD_MISC_GUEST_USER, 237 PERF_RECORD_MISC_GUEST_KERNEL 238 }; 239 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8)) 240 241 static void ip__resolve_ams(struct machine *self, struct thread *thread, 242 struct addr_map_symbol *ams, 243 u64 ip) 244 { 245 struct addr_location al; 246 size_t i; 247 u8 m; 248 249 memset(&al, 0, sizeof(al)); 250 251 for (i = 0; i < NCPUMODES; i++) { 252 m = cpumodes[i]; 253 /* 254 * We cannot use the header.misc hint to determine whether a 255 * branch stack address is user, kernel, guest, hypervisor. 256 * Branches may straddle the kernel/user/hypervisor boundaries. 257 * Thus, we have to try consecutively until we find a match 258 * or else, the symbol is unknown 259 */ 260 thread__find_addr_location(thread, self, m, MAP__FUNCTION, 261 ip, &al, NULL); 262 if (al.sym) 263 goto found; 264 } 265 found: 266 ams->addr = ip; 267 ams->al_addr = al.addr; 268 ams->sym = al.sym; 269 ams->map = al.map; 270 } 271 272 struct branch_info *machine__resolve_bstack(struct machine *self, 273 struct thread *thr, 274 struct branch_stack *bs) 275 { 276 struct branch_info *bi; 277 unsigned int i; 278 279 bi = calloc(bs->nr, sizeof(struct branch_info)); 280 if (!bi) 281 return NULL; 282 283 for (i = 0; i < bs->nr; i++) { 284 ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to); 285 ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from); 286 bi[i].flags = bs->entries[i].flags; 287 } 288 return bi; 289 } 290 291 int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel, 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(&evsel->hists.callchain_cursor); 301 302 for (i = 0; i < chain->nr; i++) { 303 u64 ip; 304 struct addr_location al; 305 306 if (callchain_param.order == ORDER_CALLEE) 307 ip = chain->ips[i]; 308 else 309 ip = chain->ips[chain->nr - i - 1]; 310 311 if (ip >= PERF_CONTEXT_MAX) { 312 switch (ip) { 313 case PERF_CONTEXT_HV: 314 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 315 case PERF_CONTEXT_KERNEL: 316 cpumode = PERF_RECORD_MISC_KERNEL; break; 317 case PERF_CONTEXT_USER: 318 cpumode = PERF_RECORD_MISC_USER; break; 319 default: 320 break; 321 } 322 continue; 323 } 324 325 al.filtered = false; 326 thread__find_addr_location(thread, self, cpumode, 327 MAP__FUNCTION, ip, &al, NULL); 328 if (al.sym != NULL) { 329 if (sort__has_parent && !*parent && 330 symbol__match_parent_regex(al.sym)) 331 *parent = al.sym; 332 if (!symbol_conf.use_callchain) 333 break; 334 } 335 336 err = callchain_cursor_append(&evsel->hists.callchain_cursor, 337 ip, al.map, al.sym); 338 if (err) 339 return err; 340 } 341 342 return 0; 343 } 344 345 static int process_event_synth_tracing_data_stub(union perf_event *event __used, 346 struct perf_session *session __used) 347 { 348 dump_printf(": unhandled!\n"); 349 return 0; 350 } 351 352 static int process_event_synth_attr_stub(union perf_event *event __used, 353 struct perf_evlist **pevlist __used) 354 { 355 dump_printf(": unhandled!\n"); 356 return 0; 357 } 358 359 static int process_event_sample_stub(struct perf_tool *tool __used, 360 union perf_event *event __used, 361 struct perf_sample *sample __used, 362 struct perf_evsel *evsel __used, 363 struct machine *machine __used) 364 { 365 dump_printf(": unhandled!\n"); 366 return 0; 367 } 368 369 static int process_event_stub(struct perf_tool *tool __used, 370 union perf_event *event __used, 371 struct perf_sample *sample __used, 372 struct machine *machine __used) 373 { 374 dump_printf(": unhandled!\n"); 375 return 0; 376 } 377 378 static int process_finished_round_stub(struct perf_tool *tool __used, 379 union perf_event *event __used, 380 struct perf_session *perf_session __used) 381 { 382 dump_printf(": unhandled!\n"); 383 return 0; 384 } 385 386 static int process_event_type_stub(struct perf_tool *tool __used, 387 union perf_event *event __used) 388 { 389 dump_printf(": unhandled!\n"); 390 return 0; 391 } 392 393 static int process_finished_round(struct perf_tool *tool, 394 union perf_event *event, 395 struct perf_session *session); 396 397 static void perf_tool__fill_defaults(struct perf_tool *tool) 398 { 399 if (tool->sample == NULL) 400 tool->sample = process_event_sample_stub; 401 if (tool->mmap == NULL) 402 tool->mmap = process_event_stub; 403 if (tool->comm == NULL) 404 tool->comm = process_event_stub; 405 if (tool->fork == NULL) 406 tool->fork = process_event_stub; 407 if (tool->exit == NULL) 408 tool->exit = process_event_stub; 409 if (tool->lost == NULL) 410 tool->lost = perf_event__process_lost; 411 if (tool->read == NULL) 412 tool->read = process_event_sample_stub; 413 if (tool->throttle == NULL) 414 tool->throttle = process_event_stub; 415 if (tool->unthrottle == NULL) 416 tool->unthrottle = process_event_stub; 417 if (tool->attr == NULL) 418 tool->attr = process_event_synth_attr_stub; 419 if (tool->event_type == NULL) 420 tool->event_type = process_event_type_stub; 421 if (tool->tracing_data == NULL) 422 tool->tracing_data = process_event_synth_tracing_data_stub; 423 if (tool->build_id == NULL) 424 tool->build_id = process_finished_round_stub; 425 if (tool->finished_round == NULL) { 426 if (tool->ordered_samples) 427 tool->finished_round = process_finished_round; 428 else 429 tool->finished_round = process_finished_round_stub; 430 } 431 } 432 433 void mem_bswap_64(void *src, int byte_size) 434 { 435 u64 *m = src; 436 437 while (byte_size > 0) { 438 *m = bswap_64(*m); 439 byte_size -= sizeof(u64); 440 ++m; 441 } 442 } 443 444 static void perf_event__all64_swap(union perf_event *event) 445 { 446 struct perf_event_header *hdr = &event->header; 447 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 448 } 449 450 static void perf_event__comm_swap(union perf_event *event) 451 { 452 event->comm.pid = bswap_32(event->comm.pid); 453 event->comm.tid = bswap_32(event->comm.tid); 454 } 455 456 static void perf_event__mmap_swap(union perf_event *event) 457 { 458 event->mmap.pid = bswap_32(event->mmap.pid); 459 event->mmap.tid = bswap_32(event->mmap.tid); 460 event->mmap.start = bswap_64(event->mmap.start); 461 event->mmap.len = bswap_64(event->mmap.len); 462 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 463 } 464 465 static void perf_event__task_swap(union perf_event *event) 466 { 467 event->fork.pid = bswap_32(event->fork.pid); 468 event->fork.tid = bswap_32(event->fork.tid); 469 event->fork.ppid = bswap_32(event->fork.ppid); 470 event->fork.ptid = bswap_32(event->fork.ptid); 471 event->fork.time = bswap_64(event->fork.time); 472 } 473 474 static void perf_event__read_swap(union perf_event *event) 475 { 476 event->read.pid = bswap_32(event->read.pid); 477 event->read.tid = bswap_32(event->read.tid); 478 event->read.value = bswap_64(event->read.value); 479 event->read.time_enabled = bswap_64(event->read.time_enabled); 480 event->read.time_running = bswap_64(event->read.time_running); 481 event->read.id = bswap_64(event->read.id); 482 } 483 484 /* exported for swapping attributes in file header */ 485 void perf_event__attr_swap(struct perf_event_attr *attr) 486 { 487 attr->type = bswap_32(attr->type); 488 attr->size = bswap_32(attr->size); 489 attr->config = bswap_64(attr->config); 490 attr->sample_period = bswap_64(attr->sample_period); 491 attr->sample_type = bswap_64(attr->sample_type); 492 attr->read_format = bswap_64(attr->read_format); 493 attr->wakeup_events = bswap_32(attr->wakeup_events); 494 attr->bp_type = bswap_32(attr->bp_type); 495 attr->bp_addr = bswap_64(attr->bp_addr); 496 attr->bp_len = bswap_64(attr->bp_len); 497 } 498 499 static void perf_event__hdr_attr_swap(union perf_event *event) 500 { 501 size_t size; 502 503 perf_event__attr_swap(&event->attr.attr); 504 505 size = event->header.size; 506 size -= (void *)&event->attr.id - (void *)event; 507 mem_bswap_64(event->attr.id, size); 508 } 509 510 static void perf_event__event_type_swap(union perf_event *event) 511 { 512 event->event_type.event_type.event_id = 513 bswap_64(event->event_type.event_type.event_id); 514 } 515 516 static void perf_event__tracing_data_swap(union perf_event *event) 517 { 518 event->tracing_data.size = bswap_32(event->tracing_data.size); 519 } 520 521 typedef void (*perf_event__swap_op)(union perf_event *event); 522 523 static perf_event__swap_op perf_event__swap_ops[] = { 524 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 525 [PERF_RECORD_COMM] = perf_event__comm_swap, 526 [PERF_RECORD_FORK] = perf_event__task_swap, 527 [PERF_RECORD_EXIT] = perf_event__task_swap, 528 [PERF_RECORD_LOST] = perf_event__all64_swap, 529 [PERF_RECORD_READ] = perf_event__read_swap, 530 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 531 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, 532 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 533 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 534 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 535 [PERF_RECORD_HEADER_MAX] = NULL, 536 }; 537 538 struct sample_queue { 539 u64 timestamp; 540 u64 file_offset; 541 union perf_event *event; 542 struct list_head list; 543 }; 544 545 static void perf_session_free_sample_buffers(struct perf_session *session) 546 { 547 struct ordered_samples *os = &session->ordered_samples; 548 549 while (!list_empty(&os->to_free)) { 550 struct sample_queue *sq; 551 552 sq = list_entry(os->to_free.next, struct sample_queue, list); 553 list_del(&sq->list); 554 free(sq); 555 } 556 } 557 558 static int perf_session_deliver_event(struct perf_session *session, 559 union perf_event *event, 560 struct perf_sample *sample, 561 struct perf_tool *tool, 562 u64 file_offset); 563 564 static void flush_sample_queue(struct perf_session *s, 565 struct perf_tool *tool) 566 { 567 struct ordered_samples *os = &s->ordered_samples; 568 struct list_head *head = &os->samples; 569 struct sample_queue *tmp, *iter; 570 struct perf_sample sample; 571 u64 limit = os->next_flush; 572 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 573 unsigned idx = 0, progress_next = os->nr_samples / 16; 574 int ret; 575 576 if (!tool->ordered_samples || !limit) 577 return; 578 579 list_for_each_entry_safe(iter, tmp, head, list) { 580 if (iter->timestamp > limit) 581 break; 582 583 ret = perf_session__parse_sample(s, iter->event, &sample); 584 if (ret) 585 pr_err("Can't parse sample, err = %d\n", ret); 586 else 587 perf_session_deliver_event(s, iter->event, &sample, tool, 588 iter->file_offset); 589 590 os->last_flush = iter->timestamp; 591 list_del(&iter->list); 592 list_add(&iter->list, &os->sample_cache); 593 if (++idx >= progress_next) { 594 progress_next += os->nr_samples / 16; 595 ui_progress__update(idx, os->nr_samples, 596 "Processing time ordered events..."); 597 } 598 } 599 600 if (list_empty(head)) { 601 os->last_sample = NULL; 602 } else if (last_ts <= limit) { 603 os->last_sample = 604 list_entry(head->prev, struct sample_queue, list); 605 } 606 607 os->nr_samples = 0; 608 } 609 610 /* 611 * When perf record finishes a pass on every buffers, it records this pseudo 612 * event. 613 * We record the max timestamp t found in the pass n. 614 * Assuming these timestamps are monotonic across cpus, we know that if 615 * a buffer still has events with timestamps below t, they will be all 616 * available and then read in the pass n + 1. 617 * Hence when we start to read the pass n + 2, we can safely flush every 618 * events with timestamps below t. 619 * 620 * ============ PASS n ================= 621 * CPU 0 | CPU 1 622 * | 623 * cnt1 timestamps | cnt2 timestamps 624 * 1 | 2 625 * 2 | 3 626 * - | 4 <--- max recorded 627 * 628 * ============ PASS n + 1 ============== 629 * CPU 0 | CPU 1 630 * | 631 * cnt1 timestamps | cnt2 timestamps 632 * 3 | 5 633 * 4 | 6 634 * 5 | 7 <---- max recorded 635 * 636 * Flush every events below timestamp 4 637 * 638 * ============ PASS n + 2 ============== 639 * CPU 0 | CPU 1 640 * | 641 * cnt1 timestamps | cnt2 timestamps 642 * 6 | 8 643 * 7 | 9 644 * - | 10 645 * 646 * Flush every events below timestamp 7 647 * etc... 648 */ 649 static int process_finished_round(struct perf_tool *tool, 650 union perf_event *event __used, 651 struct perf_session *session) 652 { 653 flush_sample_queue(session, tool); 654 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 655 656 return 0; 657 } 658 659 /* The queue is ordered by time */ 660 static void __queue_event(struct sample_queue *new, struct perf_session *s) 661 { 662 struct ordered_samples *os = &s->ordered_samples; 663 struct sample_queue *sample = os->last_sample; 664 u64 timestamp = new->timestamp; 665 struct list_head *p; 666 667 ++os->nr_samples; 668 os->last_sample = new; 669 670 if (!sample) { 671 list_add(&new->list, &os->samples); 672 os->max_timestamp = timestamp; 673 return; 674 } 675 676 /* 677 * last_sample might point to some random place in the list as it's 678 * the last queued event. We expect that the new event is close to 679 * this. 680 */ 681 if (sample->timestamp <= timestamp) { 682 while (sample->timestamp <= timestamp) { 683 p = sample->list.next; 684 if (p == &os->samples) { 685 list_add_tail(&new->list, &os->samples); 686 os->max_timestamp = timestamp; 687 return; 688 } 689 sample = list_entry(p, struct sample_queue, list); 690 } 691 list_add_tail(&new->list, &sample->list); 692 } else { 693 while (sample->timestamp > timestamp) { 694 p = sample->list.prev; 695 if (p == &os->samples) { 696 list_add(&new->list, &os->samples); 697 return; 698 } 699 sample = list_entry(p, struct sample_queue, list); 700 } 701 list_add(&new->list, &sample->list); 702 } 703 } 704 705 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 706 707 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 708 struct perf_sample *sample, u64 file_offset) 709 { 710 struct ordered_samples *os = &s->ordered_samples; 711 struct list_head *sc = &os->sample_cache; 712 u64 timestamp = sample->time; 713 struct sample_queue *new; 714 715 if (!timestamp || timestamp == ~0ULL) 716 return -ETIME; 717 718 if (timestamp < s->ordered_samples.last_flush) { 719 printf("Warning: Timestamp below last timeslice flush\n"); 720 return -EINVAL; 721 } 722 723 if (!list_empty(sc)) { 724 new = list_entry(sc->next, struct sample_queue, list); 725 list_del(&new->list); 726 } else if (os->sample_buffer) { 727 new = os->sample_buffer + os->sample_buffer_idx; 728 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 729 os->sample_buffer = NULL; 730 } else { 731 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 732 if (!os->sample_buffer) 733 return -ENOMEM; 734 list_add(&os->sample_buffer->list, &os->to_free); 735 os->sample_buffer_idx = 2; 736 new = os->sample_buffer + 1; 737 } 738 739 new->timestamp = timestamp; 740 new->file_offset = file_offset; 741 new->event = event; 742 743 __queue_event(new, s); 744 745 return 0; 746 } 747 748 static void callchain__printf(struct perf_sample *sample) 749 { 750 unsigned int i; 751 752 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 753 754 for (i = 0; i < sample->callchain->nr; i++) 755 printf("..... %2d: %016" PRIx64 "\n", 756 i, sample->callchain->ips[i]); 757 } 758 759 static void branch_stack__printf(struct perf_sample *sample) 760 { 761 uint64_t i; 762 763 printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr); 764 765 for (i = 0; i < sample->branch_stack->nr; i++) 766 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n", 767 i, sample->branch_stack->entries[i].from, 768 sample->branch_stack->entries[i].to); 769 } 770 771 static void perf_session__print_tstamp(struct perf_session *session, 772 union perf_event *event, 773 struct perf_sample *sample) 774 { 775 if (event->header.type != PERF_RECORD_SAMPLE && 776 !session->sample_id_all) { 777 fputs("-1 -1 ", stdout); 778 return; 779 } 780 781 if ((session->sample_type & PERF_SAMPLE_CPU)) 782 printf("%u ", sample->cpu); 783 784 if (session->sample_type & PERF_SAMPLE_TIME) 785 printf("%" PRIu64 " ", sample->time); 786 } 787 788 static void dump_event(struct perf_session *session, union perf_event *event, 789 u64 file_offset, struct perf_sample *sample) 790 { 791 if (!dump_trace) 792 return; 793 794 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 795 file_offset, event->header.size, event->header.type); 796 797 trace_event(event); 798 799 if (sample) 800 perf_session__print_tstamp(session, event, sample); 801 802 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 803 event->header.size, perf_event__name(event->header.type)); 804 } 805 806 static void dump_sample(struct perf_session *session, union perf_event *event, 807 struct perf_sample *sample) 808 { 809 if (!dump_trace) 810 return; 811 812 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n", 813 event->header.misc, sample->pid, sample->tid, sample->ip, 814 sample->period, sample->addr); 815 816 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 817 callchain__printf(sample); 818 819 if (session->sample_type & PERF_SAMPLE_BRANCH_STACK) 820 branch_stack__printf(sample); 821 } 822 823 static struct machine * 824 perf_session__find_machine_for_cpumode(struct perf_session *session, 825 union perf_event *event) 826 { 827 const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 828 829 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) { 830 u32 pid; 831 832 if (event->header.type == PERF_RECORD_MMAP) 833 pid = event->mmap.pid; 834 else 835 pid = event->ip.pid; 836 837 return perf_session__find_machine(session, pid); 838 } 839 840 return perf_session__find_host_machine(session); 841 } 842 843 static int perf_session_deliver_event(struct perf_session *session, 844 union perf_event *event, 845 struct perf_sample *sample, 846 struct perf_tool *tool, 847 u64 file_offset) 848 { 849 struct perf_evsel *evsel; 850 struct machine *machine; 851 852 dump_event(session, event, file_offset, sample); 853 854 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 855 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { 856 /* 857 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here 858 * because the tools right now may apply filters, discarding 859 * some of the samples. For consistency, in the future we 860 * should have something like nr_filtered_samples and remove 861 * the sample->period from total_sample_period, etc, KISS for 862 * now tho. 863 * 864 * Also testing against NULL allows us to handle files without 865 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the 866 * future probably it'll be a good idea to restrict event 867 * processing via perf_session to files with both set. 868 */ 869 hists__inc_nr_events(&evsel->hists, event->header.type); 870 } 871 872 machine = perf_session__find_machine_for_cpumode(session, event); 873 874 switch (event->header.type) { 875 case PERF_RECORD_SAMPLE: 876 dump_sample(session, event, sample); 877 if (evsel == NULL) { 878 ++session->hists.stats.nr_unknown_id; 879 return -1; 880 } 881 if (machine == NULL) { 882 ++session->hists.stats.nr_unprocessable_samples; 883 return -1; 884 } 885 return tool->sample(tool, event, sample, evsel, machine); 886 case PERF_RECORD_MMAP: 887 return tool->mmap(tool, event, sample, machine); 888 case PERF_RECORD_COMM: 889 return tool->comm(tool, event, sample, machine); 890 case PERF_RECORD_FORK: 891 return tool->fork(tool, event, sample, machine); 892 case PERF_RECORD_EXIT: 893 return tool->exit(tool, event, sample, machine); 894 case PERF_RECORD_LOST: 895 if (tool->lost == perf_event__process_lost) 896 session->hists.stats.total_lost += event->lost.lost; 897 return tool->lost(tool, event, sample, machine); 898 case PERF_RECORD_READ: 899 return tool->read(tool, event, sample, evsel, machine); 900 case PERF_RECORD_THROTTLE: 901 return tool->throttle(tool, event, sample, machine); 902 case PERF_RECORD_UNTHROTTLE: 903 return tool->unthrottle(tool, event, sample, machine); 904 default: 905 ++session->hists.stats.nr_unknown_events; 906 return -1; 907 } 908 } 909 910 static int perf_session__preprocess_sample(struct perf_session *session, 911 union perf_event *event, struct perf_sample *sample) 912 { 913 if (event->header.type != PERF_RECORD_SAMPLE || 914 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 915 return 0; 916 917 if (!ip_callchain__valid(sample->callchain, event)) { 918 pr_debug("call-chain problem with event, skipping it.\n"); 919 ++session->hists.stats.nr_invalid_chains; 920 session->hists.stats.total_invalid_chains += sample->period; 921 return -EINVAL; 922 } 923 return 0; 924 } 925 926 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 927 struct perf_tool *tool, u64 file_offset) 928 { 929 int err; 930 931 dump_event(session, event, file_offset, NULL); 932 933 /* These events are processed right away */ 934 switch (event->header.type) { 935 case PERF_RECORD_HEADER_ATTR: 936 err = tool->attr(event, &session->evlist); 937 if (err == 0) 938 perf_session__update_sample_type(session); 939 return err; 940 case PERF_RECORD_HEADER_EVENT_TYPE: 941 return tool->event_type(tool, event); 942 case PERF_RECORD_HEADER_TRACING_DATA: 943 /* setup for reading amidst mmap */ 944 lseek(session->fd, file_offset, SEEK_SET); 945 return tool->tracing_data(event, session); 946 case PERF_RECORD_HEADER_BUILD_ID: 947 return tool->build_id(tool, event, session); 948 case PERF_RECORD_FINISHED_ROUND: 949 return tool->finished_round(tool, event, session); 950 default: 951 return -EINVAL; 952 } 953 } 954 955 static int perf_session__process_event(struct perf_session *session, 956 union perf_event *event, 957 struct perf_tool *tool, 958 u64 file_offset) 959 { 960 struct perf_sample sample; 961 int ret; 962 963 if (session->header.needs_swap && 964 perf_event__swap_ops[event->header.type]) 965 perf_event__swap_ops[event->header.type](event); 966 967 if (event->header.type >= PERF_RECORD_HEADER_MAX) 968 return -EINVAL; 969 970 hists__inc_nr_events(&session->hists, event->header.type); 971 972 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 973 return perf_session__process_user_event(session, event, tool, file_offset); 974 975 /* 976 * For all kernel events we get the sample data 977 */ 978 ret = perf_session__parse_sample(session, event, &sample); 979 if (ret) 980 return ret; 981 982 /* Preprocess sample records - precheck callchains */ 983 if (perf_session__preprocess_sample(session, event, &sample)) 984 return 0; 985 986 if (tool->ordered_samples) { 987 ret = perf_session_queue_event(session, event, &sample, 988 file_offset); 989 if (ret != -ETIME) 990 return ret; 991 } 992 993 return perf_session_deliver_event(session, event, &sample, tool, 994 file_offset); 995 } 996 997 void perf_event_header__bswap(struct perf_event_header *self) 998 { 999 self->type = bswap_32(self->type); 1000 self->misc = bswap_16(self->misc); 1001 self->size = bswap_16(self->size); 1002 } 1003 1004 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) 1005 { 1006 return machine__findnew_thread(&session->host_machine, pid); 1007 } 1008 1009 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 1010 { 1011 struct thread *thread = perf_session__findnew(self, 0); 1012 1013 if (thread == NULL || thread__set_comm(thread, "swapper")) { 1014 pr_err("problem inserting idle task.\n"); 1015 thread = NULL; 1016 } 1017 1018 return thread; 1019 } 1020 1021 static void perf_session__warn_about_errors(const struct perf_session *session, 1022 const struct perf_tool *tool) 1023 { 1024 if (tool->lost == perf_event__process_lost && 1025 session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) { 1026 ui__warning("Processed %d events and lost %d chunks!\n\n" 1027 "Check IO/CPU overload!\n\n", 1028 session->hists.stats.nr_events[0], 1029 session->hists.stats.nr_events[PERF_RECORD_LOST]); 1030 } 1031 1032 if (session->hists.stats.nr_unknown_events != 0) { 1033 ui__warning("Found %u unknown events!\n\n" 1034 "Is this an older tool processing a perf.data " 1035 "file generated by a more recent tool?\n\n" 1036 "If that is not the case, consider " 1037 "reporting to linux-kernel@vger.kernel.org.\n\n", 1038 session->hists.stats.nr_unknown_events); 1039 } 1040 1041 if (session->hists.stats.nr_unknown_id != 0) { 1042 ui__warning("%u samples with id not present in the header\n", 1043 session->hists.stats.nr_unknown_id); 1044 } 1045 1046 if (session->hists.stats.nr_invalid_chains != 0) { 1047 ui__warning("Found invalid callchains!\n\n" 1048 "%u out of %u events were discarded for this reason.\n\n" 1049 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 1050 session->hists.stats.nr_invalid_chains, 1051 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 1052 } 1053 1054 if (session->hists.stats.nr_unprocessable_samples != 0) { 1055 ui__warning("%u unprocessable samples recorded.\n" 1056 "Do you have a KVM guest running and not using 'perf kvm'?\n", 1057 session->hists.stats.nr_unprocessable_samples); 1058 } 1059 } 1060 1061 #define session_done() (*(volatile int *)(&session_done)) 1062 volatile int session_done; 1063 1064 static int __perf_session__process_pipe_events(struct perf_session *self, 1065 struct perf_tool *tool) 1066 { 1067 union perf_event event; 1068 uint32_t size; 1069 int skip = 0; 1070 u64 head; 1071 int err; 1072 void *p; 1073 1074 perf_tool__fill_defaults(tool); 1075 1076 head = 0; 1077 more: 1078 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 1079 if (err <= 0) { 1080 if (err == 0) 1081 goto done; 1082 1083 pr_err("failed to read event header\n"); 1084 goto out_err; 1085 } 1086 1087 if (self->header.needs_swap) 1088 perf_event_header__bswap(&event.header); 1089 1090 size = event.header.size; 1091 if (size == 0) 1092 size = 8; 1093 1094 p = &event; 1095 p += sizeof(struct perf_event_header); 1096 1097 if (size - sizeof(struct perf_event_header)) { 1098 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 1099 if (err <= 0) { 1100 if (err == 0) { 1101 pr_err("unexpected end of event stream\n"); 1102 goto done; 1103 } 1104 1105 pr_err("failed to read event data\n"); 1106 goto out_err; 1107 } 1108 } 1109 1110 if ((skip = perf_session__process_event(self, &event, tool, head)) < 0) { 1111 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1112 head, event.header.size, event.header.type); 1113 /* 1114 * assume we lost track of the stream, check alignment, and 1115 * increment a single u64 in the hope to catch on again 'soon'. 1116 */ 1117 if (unlikely(head & 7)) 1118 head &= ~7ULL; 1119 1120 size = 8; 1121 } 1122 1123 head += size; 1124 1125 if (skip > 0) 1126 head += skip; 1127 1128 if (!session_done()) 1129 goto more; 1130 done: 1131 err = 0; 1132 out_err: 1133 perf_session__warn_about_errors(self, tool); 1134 perf_session_free_sample_buffers(self); 1135 return err; 1136 } 1137 1138 static union perf_event * 1139 fetch_mmaped_event(struct perf_session *session, 1140 u64 head, size_t mmap_size, char *buf) 1141 { 1142 union perf_event *event; 1143 1144 /* 1145 * Ensure we have enough space remaining to read 1146 * the size of the event in the headers. 1147 */ 1148 if (head + sizeof(event->header) > mmap_size) 1149 return NULL; 1150 1151 event = (union perf_event *)(buf + head); 1152 1153 if (session->header.needs_swap) 1154 perf_event_header__bswap(&event->header); 1155 1156 if (head + event->header.size > mmap_size) 1157 return NULL; 1158 1159 return event; 1160 } 1161 1162 int __perf_session__process_events(struct perf_session *session, 1163 u64 data_offset, u64 data_size, 1164 u64 file_size, struct perf_tool *tool) 1165 { 1166 u64 head, page_offset, file_offset, file_pos, progress_next; 1167 int err, mmap_prot, mmap_flags, map_idx = 0; 1168 size_t page_size, mmap_size; 1169 char *buf, *mmaps[8]; 1170 union perf_event *event; 1171 uint32_t size; 1172 1173 perf_tool__fill_defaults(tool); 1174 1175 page_size = sysconf(_SC_PAGESIZE); 1176 1177 page_offset = page_size * (data_offset / page_size); 1178 file_offset = page_offset; 1179 head = data_offset - page_offset; 1180 1181 if (data_offset + data_size < file_size) 1182 file_size = data_offset + data_size; 1183 1184 progress_next = file_size / 16; 1185 1186 mmap_size = session->mmap_window; 1187 if (mmap_size > file_size) 1188 mmap_size = file_size; 1189 1190 memset(mmaps, 0, sizeof(mmaps)); 1191 1192 mmap_prot = PROT_READ; 1193 mmap_flags = MAP_SHARED; 1194 1195 if (session->header.needs_swap) { 1196 mmap_prot |= PROT_WRITE; 1197 mmap_flags = MAP_PRIVATE; 1198 } 1199 remap: 1200 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1201 file_offset); 1202 if (buf == MAP_FAILED) { 1203 pr_err("failed to mmap file\n"); 1204 err = -errno; 1205 goto out_err; 1206 } 1207 mmaps[map_idx] = buf; 1208 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1209 file_pos = file_offset + head; 1210 1211 more: 1212 event = fetch_mmaped_event(session, head, mmap_size, buf); 1213 if (!event) { 1214 if (mmaps[map_idx]) { 1215 munmap(mmaps[map_idx], mmap_size); 1216 mmaps[map_idx] = NULL; 1217 } 1218 1219 page_offset = page_size * (head / page_size); 1220 file_offset += page_offset; 1221 head -= page_offset; 1222 goto remap; 1223 } 1224 1225 size = event->header.size; 1226 1227 if (size == 0 || 1228 perf_session__process_event(session, event, tool, file_pos) < 0) { 1229 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1230 file_offset + head, event->header.size, 1231 event->header.type); 1232 /* 1233 * assume we lost track of the stream, check alignment, and 1234 * increment a single u64 in the hope to catch on again 'soon'. 1235 */ 1236 if (unlikely(head & 7)) 1237 head &= ~7ULL; 1238 1239 size = 8; 1240 } 1241 1242 head += size; 1243 file_pos += size; 1244 1245 if (file_pos >= progress_next) { 1246 progress_next += file_size / 16; 1247 ui_progress__update(file_pos, file_size, 1248 "Processing events..."); 1249 } 1250 1251 if (file_pos < file_size) 1252 goto more; 1253 1254 err = 0; 1255 /* do the final flush for ordered samples */ 1256 session->ordered_samples.next_flush = ULLONG_MAX; 1257 flush_sample_queue(session, tool); 1258 out_err: 1259 perf_session__warn_about_errors(session, tool); 1260 perf_session_free_sample_buffers(session); 1261 return err; 1262 } 1263 1264 int perf_session__process_events(struct perf_session *self, 1265 struct perf_tool *tool) 1266 { 1267 int err; 1268 1269 if (perf_session__register_idle_thread(self) == NULL) 1270 return -ENOMEM; 1271 1272 if (!self->fd_pipe) 1273 err = __perf_session__process_events(self, 1274 self->header.data_offset, 1275 self->header.data_size, 1276 self->size, tool); 1277 else 1278 err = __perf_session__process_pipe_events(self, tool); 1279 1280 return err; 1281 } 1282 1283 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1284 { 1285 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1286 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1287 return false; 1288 } 1289 1290 return true; 1291 } 1292 1293 int maps__set_kallsyms_ref_reloc_sym(struct map **maps, 1294 const char *symbol_name, u64 addr) 1295 { 1296 char *bracket; 1297 enum map_type i; 1298 struct ref_reloc_sym *ref; 1299 1300 ref = zalloc(sizeof(struct ref_reloc_sym)); 1301 if (ref == NULL) 1302 return -ENOMEM; 1303 1304 ref->name = strdup(symbol_name); 1305 if (ref->name == NULL) { 1306 free(ref); 1307 return -ENOMEM; 1308 } 1309 1310 bracket = strchr(ref->name, ']'); 1311 if (bracket) 1312 *bracket = '\0'; 1313 1314 ref->addr = addr; 1315 1316 for (i = 0; i < MAP__NR_TYPES; ++i) { 1317 struct kmap *kmap = map__kmap(maps[i]); 1318 kmap->ref_reloc_sym = ref; 1319 } 1320 1321 return 0; 1322 } 1323 1324 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1325 { 1326 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1327 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1328 machines__fprintf_dsos(&self->machines, fp); 1329 } 1330 1331 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1332 bool with_hits) 1333 { 1334 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1335 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1336 } 1337 1338 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1339 { 1340 struct perf_evsel *pos; 1341 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1342 1343 ret += hists__fprintf_nr_events(&session->hists, fp); 1344 1345 list_for_each_entry(pos, &session->evlist->entries, node) { 1346 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1347 ret += hists__fprintf_nr_events(&pos->hists, fp); 1348 } 1349 1350 return ret; 1351 } 1352 1353 size_t perf_session__fprintf(struct perf_session *session, FILE *fp) 1354 { 1355 /* 1356 * FIXME: Here we have to actually print all the machines in this 1357 * session, not just the host... 1358 */ 1359 return machine__fprintf(&session->host_machine, fp); 1360 } 1361 1362 void perf_session__remove_thread(struct perf_session *session, 1363 struct thread *th) 1364 { 1365 /* 1366 * FIXME: This one makes no sense, we need to remove the thread from 1367 * the machine it belongs to, perf_session can have many machines, so 1368 * doing it always on ->host_machine is wrong. Fix when auditing all 1369 * the 'perf kvm' code. 1370 */ 1371 machine__remove_thread(&session->host_machine, th); 1372 } 1373 1374 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1375 unsigned int type) 1376 { 1377 struct perf_evsel *pos; 1378 1379 list_for_each_entry(pos, &session->evlist->entries, node) { 1380 if (pos->attr.type == type) 1381 return pos; 1382 } 1383 return NULL; 1384 } 1385 1386 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample, 1387 struct machine *machine, struct perf_evsel *evsel, 1388 int print_sym, int print_dso, int print_symoffset) 1389 { 1390 struct addr_location al; 1391 struct callchain_cursor *cursor = &evsel->hists.callchain_cursor; 1392 struct callchain_cursor_node *node; 1393 1394 if (perf_event__preprocess_sample(event, machine, &al, sample, 1395 NULL) < 0) { 1396 error("problem processing %d event, skipping it.\n", 1397 event->header.type); 1398 return; 1399 } 1400 1401 if (symbol_conf.use_callchain && sample->callchain) { 1402 1403 if (machine__resolve_callchain(machine, evsel, al.thread, 1404 sample->callchain, NULL) != 0) { 1405 if (verbose) 1406 error("Failed to resolve callchain. Skipping\n"); 1407 return; 1408 } 1409 callchain_cursor_commit(cursor); 1410 1411 while (1) { 1412 node = callchain_cursor_current(cursor); 1413 if (!node) 1414 break; 1415 1416 printf("\t%16" PRIx64, node->ip); 1417 if (print_sym) { 1418 printf(" "); 1419 symbol__fprintf_symname(node->sym, stdout); 1420 } 1421 if (print_dso) { 1422 printf(" ("); 1423 map__fprintf_dsoname(al.map, stdout); 1424 printf(")"); 1425 } 1426 printf("\n"); 1427 1428 callchain_cursor_advance(cursor); 1429 } 1430 1431 } else { 1432 printf("%16" PRIx64, sample->ip); 1433 if (print_sym) { 1434 printf(" "); 1435 if (print_symoffset) 1436 symbol__fprintf_symname_offs(al.sym, &al, 1437 stdout); 1438 else 1439 symbol__fprintf_symname(al.sym, stdout); 1440 } 1441 1442 if (print_dso) { 1443 printf(" ("); 1444 map__fprintf_dsoname(al.map, stdout); 1445 printf(")"); 1446 } 1447 } 1448 } 1449 1450 int perf_session__cpu_bitmap(struct perf_session *session, 1451 const char *cpu_list, unsigned long *cpu_bitmap) 1452 { 1453 int i; 1454 struct cpu_map *map; 1455 1456 for (i = 0; i < PERF_TYPE_MAX; ++i) { 1457 struct perf_evsel *evsel; 1458 1459 evsel = perf_session__find_first_evtype(session, i); 1460 if (!evsel) 1461 continue; 1462 1463 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { 1464 pr_err("File does not contain CPU events. " 1465 "Remove -c option to proceed.\n"); 1466 return -1; 1467 } 1468 } 1469 1470 map = cpu_map__new(cpu_list); 1471 if (map == NULL) { 1472 pr_err("Invalid cpu_list\n"); 1473 return -1; 1474 } 1475 1476 for (i = 0; i < map->nr; i++) { 1477 int cpu = map->map[i]; 1478 1479 if (cpu >= MAX_NR_CPUS) { 1480 pr_err("Requested CPU %d too large. " 1481 "Consider raising MAX_NR_CPUS\n", cpu); 1482 return -1; 1483 } 1484 1485 set_bit(cpu, cpu_bitmap); 1486 } 1487 1488 return 0; 1489 } 1490 1491 void perf_session__fprintf_info(struct perf_session *session, FILE *fp, 1492 bool full) 1493 { 1494 struct stat st; 1495 int ret; 1496 1497 if (session == NULL || fp == NULL) 1498 return; 1499 1500 ret = fstat(session->fd, &st); 1501 if (ret == -1) 1502 return; 1503 1504 fprintf(fp, "# ========\n"); 1505 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); 1506 perf_header__fprintf_info(session, fp, full); 1507 fprintf(fp, "# ========\n#\n"); 1508 } 1509