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); 143 144 if (mode == O_RDONLY) { 145 if (perf_session__open(self, force) < 0) 146 goto out_delete; 147 perf_session__update_sample_type(self); 148 } else if (mode == O_WRONLY) { 149 /* 150 * In O_RDONLY mode this will be performed when reading the 151 * kernel MMAP event, in perf_event__process_mmap(). 152 */ 153 if (perf_session__create_kernel_maps(self) < 0) 154 goto out_delete; 155 } 156 157 if (tool && tool->ordering_requires_timestamps && 158 tool->ordered_samples && !self->sample_id_all) { 159 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n"); 160 tool->ordered_samples = false; 161 } 162 163 out: 164 return self; 165 out_delete: 166 perf_session__delete(self); 167 return NULL; 168 } 169 170 static void machine__delete_dead_threads(struct machine *machine) 171 { 172 struct thread *n, *t; 173 174 list_for_each_entry_safe(t, n, &machine->dead_threads, node) { 175 list_del(&t->node); 176 thread__delete(t); 177 } 178 } 179 180 static void perf_session__delete_dead_threads(struct perf_session *session) 181 { 182 machine__delete_dead_threads(&session->host_machine); 183 } 184 185 static void machine__delete_threads(struct machine *self) 186 { 187 struct rb_node *nd = rb_first(&self->threads); 188 189 while (nd) { 190 struct thread *t = rb_entry(nd, struct thread, rb_node); 191 192 rb_erase(&t->rb_node, &self->threads); 193 nd = rb_next(nd); 194 thread__delete(t); 195 } 196 } 197 198 static void perf_session__delete_threads(struct perf_session *session) 199 { 200 machine__delete_threads(&session->host_machine); 201 } 202 203 void perf_session__delete(struct perf_session *self) 204 { 205 perf_session__destroy_kernel_maps(self); 206 perf_session__delete_dead_threads(self); 207 perf_session__delete_threads(self); 208 machine__exit(&self->host_machine); 209 close(self->fd); 210 free(self); 211 } 212 213 void machine__remove_thread(struct machine *self, struct thread *th) 214 { 215 self->last_match = NULL; 216 rb_erase(&th->rb_node, &self->threads); 217 /* 218 * We may have references to this thread, for instance in some hist_entry 219 * instances, so just move them to a separate list. 220 */ 221 list_add_tail(&th->node, &self->dead_threads); 222 } 223 224 static bool symbol__match_parent_regex(struct symbol *sym) 225 { 226 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) 227 return 1; 228 229 return 0; 230 } 231 232 static const u8 cpumodes[] = { 233 PERF_RECORD_MISC_USER, 234 PERF_RECORD_MISC_KERNEL, 235 PERF_RECORD_MISC_GUEST_USER, 236 PERF_RECORD_MISC_GUEST_KERNEL 237 }; 238 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8)) 239 240 static void ip__resolve_ams(struct machine *self, struct thread *thread, 241 struct addr_map_symbol *ams, 242 u64 ip) 243 { 244 struct addr_location al; 245 size_t i; 246 u8 m; 247 248 memset(&al, 0, sizeof(al)); 249 250 for (i = 0; i < NCPUMODES; i++) { 251 m = cpumodes[i]; 252 /* 253 * We cannot use the header.misc hint to determine whether a 254 * branch stack address is user, kernel, guest, hypervisor. 255 * Branches may straddle the kernel/user/hypervisor boundaries. 256 * Thus, we have to try consecutively until we find a match 257 * or else, the symbol is unknown 258 */ 259 thread__find_addr_location(thread, self, m, MAP__FUNCTION, 260 ip, &al, NULL); 261 if (al.sym) 262 goto found; 263 } 264 found: 265 ams->addr = ip; 266 ams->sym = al.sym; 267 ams->map = al.map; 268 } 269 270 struct branch_info *machine__resolve_bstack(struct machine *self, 271 struct thread *thr, 272 struct branch_stack *bs) 273 { 274 struct branch_info *bi; 275 unsigned int i; 276 277 bi = calloc(bs->nr, sizeof(struct branch_info)); 278 if (!bi) 279 return NULL; 280 281 for (i = 0; i < bs->nr; i++) { 282 ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to); 283 ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from); 284 bi[i].flags = bs->entries[i].flags; 285 } 286 return bi; 287 } 288 289 int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel, 290 struct thread *thread, 291 struct ip_callchain *chain, 292 struct symbol **parent) 293 { 294 u8 cpumode = PERF_RECORD_MISC_USER; 295 unsigned int i; 296 int err; 297 298 callchain_cursor_reset(&evsel->hists.callchain_cursor); 299 300 for (i = 0; i < chain->nr; i++) { 301 u64 ip; 302 struct addr_location al; 303 304 if (callchain_param.order == ORDER_CALLEE) 305 ip = chain->ips[i]; 306 else 307 ip = chain->ips[chain->nr - i - 1]; 308 309 if (ip >= PERF_CONTEXT_MAX) { 310 switch (ip) { 311 case PERF_CONTEXT_HV: 312 cpumode = PERF_RECORD_MISC_HYPERVISOR; break; 313 case PERF_CONTEXT_KERNEL: 314 cpumode = PERF_RECORD_MISC_KERNEL; break; 315 case PERF_CONTEXT_USER: 316 cpumode = PERF_RECORD_MISC_USER; break; 317 default: 318 break; 319 } 320 continue; 321 } 322 323 al.filtered = false; 324 thread__find_addr_location(thread, self, cpumode, 325 MAP__FUNCTION, ip, &al, NULL); 326 if (al.sym != NULL) { 327 if (sort__has_parent && !*parent && 328 symbol__match_parent_regex(al.sym)) 329 *parent = al.sym; 330 if (!symbol_conf.use_callchain) 331 break; 332 } 333 334 err = callchain_cursor_append(&evsel->hists.callchain_cursor, 335 ip, al.map, al.sym); 336 if (err) 337 return err; 338 } 339 340 return 0; 341 } 342 343 static int process_event_synth_tracing_data_stub(union perf_event *event __used, 344 struct perf_session *session __used) 345 { 346 dump_printf(": unhandled!\n"); 347 return 0; 348 } 349 350 static int process_event_synth_attr_stub(union perf_event *event __used, 351 struct perf_evlist **pevlist __used) 352 { 353 dump_printf(": unhandled!\n"); 354 return 0; 355 } 356 357 static int process_event_sample_stub(struct perf_tool *tool __used, 358 union perf_event *event __used, 359 struct perf_sample *sample __used, 360 struct perf_evsel *evsel __used, 361 struct machine *machine __used) 362 { 363 dump_printf(": unhandled!\n"); 364 return 0; 365 } 366 367 static int process_event_stub(struct perf_tool *tool __used, 368 union perf_event *event __used, 369 struct perf_sample *sample __used, 370 struct machine *machine __used) 371 { 372 dump_printf(": unhandled!\n"); 373 return 0; 374 } 375 376 static int process_finished_round_stub(struct perf_tool *tool __used, 377 union perf_event *event __used, 378 struct perf_session *perf_session __used) 379 { 380 dump_printf(": unhandled!\n"); 381 return 0; 382 } 383 384 static int process_event_type_stub(struct perf_tool *tool __used, 385 union perf_event *event __used) 386 { 387 dump_printf(": unhandled!\n"); 388 return 0; 389 } 390 391 static int process_finished_round(struct perf_tool *tool, 392 union perf_event *event, 393 struct perf_session *session); 394 395 static void perf_tool__fill_defaults(struct perf_tool *tool) 396 { 397 if (tool->sample == NULL) 398 tool->sample = process_event_sample_stub; 399 if (tool->mmap == NULL) 400 tool->mmap = process_event_stub; 401 if (tool->comm == NULL) 402 tool->comm = process_event_stub; 403 if (tool->fork == NULL) 404 tool->fork = process_event_stub; 405 if (tool->exit == NULL) 406 tool->exit = process_event_stub; 407 if (tool->lost == NULL) 408 tool->lost = perf_event__process_lost; 409 if (tool->read == NULL) 410 tool->read = process_event_sample_stub; 411 if (tool->throttle == NULL) 412 tool->throttle = process_event_stub; 413 if (tool->unthrottle == NULL) 414 tool->unthrottle = process_event_stub; 415 if (tool->attr == NULL) 416 tool->attr = process_event_synth_attr_stub; 417 if (tool->event_type == NULL) 418 tool->event_type = process_event_type_stub; 419 if (tool->tracing_data == NULL) 420 tool->tracing_data = process_event_synth_tracing_data_stub; 421 if (tool->build_id == NULL) 422 tool->build_id = process_finished_round_stub; 423 if (tool->finished_round == NULL) { 424 if (tool->ordered_samples) 425 tool->finished_round = process_finished_round; 426 else 427 tool->finished_round = process_finished_round_stub; 428 } 429 } 430 431 void mem_bswap_64(void *src, int byte_size) 432 { 433 u64 *m = src; 434 435 while (byte_size > 0) { 436 *m = bswap_64(*m); 437 byte_size -= sizeof(u64); 438 ++m; 439 } 440 } 441 442 static void perf_event__all64_swap(union perf_event *event) 443 { 444 struct perf_event_header *hdr = &event->header; 445 mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr)); 446 } 447 448 static void perf_event__comm_swap(union perf_event *event) 449 { 450 event->comm.pid = bswap_32(event->comm.pid); 451 event->comm.tid = bswap_32(event->comm.tid); 452 } 453 454 static void perf_event__mmap_swap(union perf_event *event) 455 { 456 event->mmap.pid = bswap_32(event->mmap.pid); 457 event->mmap.tid = bswap_32(event->mmap.tid); 458 event->mmap.start = bswap_64(event->mmap.start); 459 event->mmap.len = bswap_64(event->mmap.len); 460 event->mmap.pgoff = bswap_64(event->mmap.pgoff); 461 } 462 463 static void perf_event__task_swap(union perf_event *event) 464 { 465 event->fork.pid = bswap_32(event->fork.pid); 466 event->fork.tid = bswap_32(event->fork.tid); 467 event->fork.ppid = bswap_32(event->fork.ppid); 468 event->fork.ptid = bswap_32(event->fork.ptid); 469 event->fork.time = bswap_64(event->fork.time); 470 } 471 472 static void perf_event__read_swap(union perf_event *event) 473 { 474 event->read.pid = bswap_32(event->read.pid); 475 event->read.tid = bswap_32(event->read.tid); 476 event->read.value = bswap_64(event->read.value); 477 event->read.time_enabled = bswap_64(event->read.time_enabled); 478 event->read.time_running = bswap_64(event->read.time_running); 479 event->read.id = bswap_64(event->read.id); 480 } 481 482 /* exported for swapping attributes in file header */ 483 void perf_event__attr_swap(struct perf_event_attr *attr) 484 { 485 attr->type = bswap_32(attr->type); 486 attr->size = bswap_32(attr->size); 487 attr->config = bswap_64(attr->config); 488 attr->sample_period = bswap_64(attr->sample_period); 489 attr->sample_type = bswap_64(attr->sample_type); 490 attr->read_format = bswap_64(attr->read_format); 491 attr->wakeup_events = bswap_32(attr->wakeup_events); 492 attr->bp_type = bswap_32(attr->bp_type); 493 attr->bp_addr = bswap_64(attr->bp_addr); 494 attr->bp_len = bswap_64(attr->bp_len); 495 } 496 497 static void perf_event__hdr_attr_swap(union perf_event *event) 498 { 499 size_t size; 500 501 perf_event__attr_swap(&event->attr.attr); 502 503 size = event->header.size; 504 size -= (void *)&event->attr.id - (void *)event; 505 mem_bswap_64(event->attr.id, size); 506 } 507 508 static void perf_event__event_type_swap(union perf_event *event) 509 { 510 event->event_type.event_type.event_id = 511 bswap_64(event->event_type.event_type.event_id); 512 } 513 514 static void perf_event__tracing_data_swap(union perf_event *event) 515 { 516 event->tracing_data.size = bswap_32(event->tracing_data.size); 517 } 518 519 typedef void (*perf_event__swap_op)(union perf_event *event); 520 521 static perf_event__swap_op perf_event__swap_ops[] = { 522 [PERF_RECORD_MMAP] = perf_event__mmap_swap, 523 [PERF_RECORD_COMM] = perf_event__comm_swap, 524 [PERF_RECORD_FORK] = perf_event__task_swap, 525 [PERF_RECORD_EXIT] = perf_event__task_swap, 526 [PERF_RECORD_LOST] = perf_event__all64_swap, 527 [PERF_RECORD_READ] = perf_event__read_swap, 528 [PERF_RECORD_SAMPLE] = perf_event__all64_swap, 529 [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, 530 [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, 531 [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, 532 [PERF_RECORD_HEADER_BUILD_ID] = NULL, 533 [PERF_RECORD_HEADER_MAX] = NULL, 534 }; 535 536 struct sample_queue { 537 u64 timestamp; 538 u64 file_offset; 539 union perf_event *event; 540 struct list_head list; 541 }; 542 543 static void perf_session_free_sample_buffers(struct perf_session *session) 544 { 545 struct ordered_samples *os = &session->ordered_samples; 546 547 while (!list_empty(&os->to_free)) { 548 struct sample_queue *sq; 549 550 sq = list_entry(os->to_free.next, struct sample_queue, list); 551 list_del(&sq->list); 552 free(sq); 553 } 554 } 555 556 static int perf_session_deliver_event(struct perf_session *session, 557 union perf_event *event, 558 struct perf_sample *sample, 559 struct perf_tool *tool, 560 u64 file_offset); 561 562 static void flush_sample_queue(struct perf_session *s, 563 struct perf_tool *tool) 564 { 565 struct ordered_samples *os = &s->ordered_samples; 566 struct list_head *head = &os->samples; 567 struct sample_queue *tmp, *iter; 568 struct perf_sample sample; 569 u64 limit = os->next_flush; 570 u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL; 571 unsigned idx = 0, progress_next = os->nr_samples / 16; 572 int ret; 573 574 if (!tool->ordered_samples || !limit) 575 return; 576 577 list_for_each_entry_safe(iter, tmp, head, list) { 578 if (iter->timestamp > limit) 579 break; 580 581 ret = perf_session__parse_sample(s, iter->event, &sample); 582 if (ret) 583 pr_err("Can't parse sample, err = %d\n", ret); 584 else 585 perf_session_deliver_event(s, iter->event, &sample, tool, 586 iter->file_offset); 587 588 os->last_flush = iter->timestamp; 589 list_del(&iter->list); 590 list_add(&iter->list, &os->sample_cache); 591 if (++idx >= progress_next) { 592 progress_next += os->nr_samples / 16; 593 ui_progress__update(idx, os->nr_samples, 594 "Processing time ordered events..."); 595 } 596 } 597 598 if (list_empty(head)) { 599 os->last_sample = NULL; 600 } else if (last_ts <= limit) { 601 os->last_sample = 602 list_entry(head->prev, struct sample_queue, list); 603 } 604 605 os->nr_samples = 0; 606 } 607 608 /* 609 * When perf record finishes a pass on every buffers, it records this pseudo 610 * event. 611 * We record the max timestamp t found in the pass n. 612 * Assuming these timestamps are monotonic across cpus, we know that if 613 * a buffer still has events with timestamps below t, they will be all 614 * available and then read in the pass n + 1. 615 * Hence when we start to read the pass n + 2, we can safely flush every 616 * events with timestamps below t. 617 * 618 * ============ PASS n ================= 619 * CPU 0 | CPU 1 620 * | 621 * cnt1 timestamps | cnt2 timestamps 622 * 1 | 2 623 * 2 | 3 624 * - | 4 <--- max recorded 625 * 626 * ============ PASS n + 1 ============== 627 * CPU 0 | CPU 1 628 * | 629 * cnt1 timestamps | cnt2 timestamps 630 * 3 | 5 631 * 4 | 6 632 * 5 | 7 <---- max recorded 633 * 634 * Flush every events below timestamp 4 635 * 636 * ============ PASS n + 2 ============== 637 * CPU 0 | CPU 1 638 * | 639 * cnt1 timestamps | cnt2 timestamps 640 * 6 | 8 641 * 7 | 9 642 * - | 10 643 * 644 * Flush every events below timestamp 7 645 * etc... 646 */ 647 static int process_finished_round(struct perf_tool *tool, 648 union perf_event *event __used, 649 struct perf_session *session) 650 { 651 flush_sample_queue(session, tool); 652 session->ordered_samples.next_flush = session->ordered_samples.max_timestamp; 653 654 return 0; 655 } 656 657 /* The queue is ordered by time */ 658 static void __queue_event(struct sample_queue *new, struct perf_session *s) 659 { 660 struct ordered_samples *os = &s->ordered_samples; 661 struct sample_queue *sample = os->last_sample; 662 u64 timestamp = new->timestamp; 663 struct list_head *p; 664 665 ++os->nr_samples; 666 os->last_sample = new; 667 668 if (!sample) { 669 list_add(&new->list, &os->samples); 670 os->max_timestamp = timestamp; 671 return; 672 } 673 674 /* 675 * last_sample might point to some random place in the list as it's 676 * the last queued event. We expect that the new event is close to 677 * this. 678 */ 679 if (sample->timestamp <= timestamp) { 680 while (sample->timestamp <= timestamp) { 681 p = sample->list.next; 682 if (p == &os->samples) { 683 list_add_tail(&new->list, &os->samples); 684 os->max_timestamp = timestamp; 685 return; 686 } 687 sample = list_entry(p, struct sample_queue, list); 688 } 689 list_add_tail(&new->list, &sample->list); 690 } else { 691 while (sample->timestamp > timestamp) { 692 p = sample->list.prev; 693 if (p == &os->samples) { 694 list_add(&new->list, &os->samples); 695 return; 696 } 697 sample = list_entry(p, struct sample_queue, list); 698 } 699 list_add(&new->list, &sample->list); 700 } 701 } 702 703 #define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) 704 705 static int perf_session_queue_event(struct perf_session *s, union perf_event *event, 706 struct perf_sample *sample, u64 file_offset) 707 { 708 struct ordered_samples *os = &s->ordered_samples; 709 struct list_head *sc = &os->sample_cache; 710 u64 timestamp = sample->time; 711 struct sample_queue *new; 712 713 if (!timestamp || timestamp == ~0ULL) 714 return -ETIME; 715 716 if (timestamp < s->ordered_samples.last_flush) { 717 printf("Warning: Timestamp below last timeslice flush\n"); 718 return -EINVAL; 719 } 720 721 if (!list_empty(sc)) { 722 new = list_entry(sc->next, struct sample_queue, list); 723 list_del(&new->list); 724 } else if (os->sample_buffer) { 725 new = os->sample_buffer + os->sample_buffer_idx; 726 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) 727 os->sample_buffer = NULL; 728 } else { 729 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); 730 if (!os->sample_buffer) 731 return -ENOMEM; 732 list_add(&os->sample_buffer->list, &os->to_free); 733 os->sample_buffer_idx = 2; 734 new = os->sample_buffer + 1; 735 } 736 737 new->timestamp = timestamp; 738 new->file_offset = file_offset; 739 new->event = event; 740 741 __queue_event(new, s); 742 743 return 0; 744 } 745 746 static void callchain__printf(struct perf_sample *sample) 747 { 748 unsigned int i; 749 750 printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr); 751 752 for (i = 0; i < sample->callchain->nr; i++) 753 printf("..... %2d: %016" PRIx64 "\n", 754 i, sample->callchain->ips[i]); 755 } 756 757 static void branch_stack__printf(struct perf_sample *sample) 758 { 759 uint64_t i; 760 761 printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr); 762 763 for (i = 0; i < sample->branch_stack->nr; i++) 764 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n", 765 i, sample->branch_stack->entries[i].from, 766 sample->branch_stack->entries[i].to); 767 } 768 769 static void perf_session__print_tstamp(struct perf_session *session, 770 union perf_event *event, 771 struct perf_sample *sample) 772 { 773 if (event->header.type != PERF_RECORD_SAMPLE && 774 !session->sample_id_all) { 775 fputs("-1 -1 ", stdout); 776 return; 777 } 778 779 if ((session->sample_type & PERF_SAMPLE_CPU)) 780 printf("%u ", sample->cpu); 781 782 if (session->sample_type & PERF_SAMPLE_TIME) 783 printf("%" PRIu64 " ", sample->time); 784 } 785 786 static void dump_event(struct perf_session *session, union perf_event *event, 787 u64 file_offset, struct perf_sample *sample) 788 { 789 if (!dump_trace) 790 return; 791 792 printf("\n%#" PRIx64 " [%#x]: event: %d\n", 793 file_offset, event->header.size, event->header.type); 794 795 trace_event(event); 796 797 if (sample) 798 perf_session__print_tstamp(session, event, sample); 799 800 printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset, 801 event->header.size, perf_event__name(event->header.type)); 802 } 803 804 static void dump_sample(struct perf_session *session, union perf_event *event, 805 struct perf_sample *sample) 806 { 807 if (!dump_trace) 808 return; 809 810 printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n", 811 event->header.misc, sample->pid, sample->tid, sample->ip, 812 sample->period, sample->addr); 813 814 if (session->sample_type & PERF_SAMPLE_CALLCHAIN) 815 callchain__printf(sample); 816 817 if (session->sample_type & PERF_SAMPLE_BRANCH_STACK) 818 branch_stack__printf(sample); 819 } 820 821 static struct machine * 822 perf_session__find_machine_for_cpumode(struct perf_session *session, 823 union perf_event *event) 824 { 825 const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 826 827 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) 828 return perf_session__find_machine(session, event->ip.pid); 829 830 return perf_session__find_host_machine(session); 831 } 832 833 static int perf_session_deliver_event(struct perf_session *session, 834 union perf_event *event, 835 struct perf_sample *sample, 836 struct perf_tool *tool, 837 u64 file_offset) 838 { 839 struct perf_evsel *evsel; 840 struct machine *machine; 841 842 dump_event(session, event, file_offset, sample); 843 844 evsel = perf_evlist__id2evsel(session->evlist, sample->id); 845 if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) { 846 /* 847 * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here 848 * because the tools right now may apply filters, discarding 849 * some of the samples. For consistency, in the future we 850 * should have something like nr_filtered_samples and remove 851 * the sample->period from total_sample_period, etc, KISS for 852 * now tho. 853 * 854 * Also testing against NULL allows us to handle files without 855 * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the 856 * future probably it'll be a good idea to restrict event 857 * processing via perf_session to files with both set. 858 */ 859 hists__inc_nr_events(&evsel->hists, event->header.type); 860 } 861 862 machine = perf_session__find_machine_for_cpumode(session, event); 863 864 switch (event->header.type) { 865 case PERF_RECORD_SAMPLE: 866 dump_sample(session, event, sample); 867 if (evsel == NULL) { 868 ++session->hists.stats.nr_unknown_id; 869 return -1; 870 } 871 if (machine == NULL) { 872 ++session->hists.stats.nr_unprocessable_samples; 873 return -1; 874 } 875 return tool->sample(tool, event, sample, evsel, machine); 876 case PERF_RECORD_MMAP: 877 return tool->mmap(tool, event, sample, machine); 878 case PERF_RECORD_COMM: 879 return tool->comm(tool, event, sample, machine); 880 case PERF_RECORD_FORK: 881 return tool->fork(tool, event, sample, machine); 882 case PERF_RECORD_EXIT: 883 return tool->exit(tool, event, sample, machine); 884 case PERF_RECORD_LOST: 885 if (tool->lost == perf_event__process_lost) 886 session->hists.stats.total_lost += event->lost.lost; 887 return tool->lost(tool, event, sample, machine); 888 case PERF_RECORD_READ: 889 return tool->read(tool, event, sample, evsel, machine); 890 case PERF_RECORD_THROTTLE: 891 return tool->throttle(tool, event, sample, machine); 892 case PERF_RECORD_UNTHROTTLE: 893 return tool->unthrottle(tool, event, sample, machine); 894 default: 895 ++session->hists.stats.nr_unknown_events; 896 return -1; 897 } 898 } 899 900 static int perf_session__preprocess_sample(struct perf_session *session, 901 union perf_event *event, struct perf_sample *sample) 902 { 903 if (event->header.type != PERF_RECORD_SAMPLE || 904 !(session->sample_type & PERF_SAMPLE_CALLCHAIN)) 905 return 0; 906 907 if (!ip_callchain__valid(sample->callchain, event)) { 908 pr_debug("call-chain problem with event, skipping it.\n"); 909 ++session->hists.stats.nr_invalid_chains; 910 session->hists.stats.total_invalid_chains += sample->period; 911 return -EINVAL; 912 } 913 return 0; 914 } 915 916 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event, 917 struct perf_tool *tool, u64 file_offset) 918 { 919 int err; 920 921 dump_event(session, event, file_offset, NULL); 922 923 /* These events are processed right away */ 924 switch (event->header.type) { 925 case PERF_RECORD_HEADER_ATTR: 926 err = tool->attr(event, &session->evlist); 927 if (err == 0) 928 perf_session__update_sample_type(session); 929 return err; 930 case PERF_RECORD_HEADER_EVENT_TYPE: 931 return tool->event_type(tool, event); 932 case PERF_RECORD_HEADER_TRACING_DATA: 933 /* setup for reading amidst mmap */ 934 lseek(session->fd, file_offset, SEEK_SET); 935 return tool->tracing_data(event, session); 936 case PERF_RECORD_HEADER_BUILD_ID: 937 return tool->build_id(tool, event, session); 938 case PERF_RECORD_FINISHED_ROUND: 939 return tool->finished_round(tool, event, session); 940 default: 941 return -EINVAL; 942 } 943 } 944 945 static int perf_session__process_event(struct perf_session *session, 946 union perf_event *event, 947 struct perf_tool *tool, 948 u64 file_offset) 949 { 950 struct perf_sample sample; 951 int ret; 952 953 if (session->header.needs_swap && 954 perf_event__swap_ops[event->header.type]) 955 perf_event__swap_ops[event->header.type](event); 956 957 if (event->header.type >= PERF_RECORD_HEADER_MAX) 958 return -EINVAL; 959 960 hists__inc_nr_events(&session->hists, event->header.type); 961 962 if (event->header.type >= PERF_RECORD_USER_TYPE_START) 963 return perf_session__process_user_event(session, event, tool, file_offset); 964 965 /* 966 * For all kernel events we get the sample data 967 */ 968 ret = perf_session__parse_sample(session, event, &sample); 969 if (ret) 970 return ret; 971 972 /* Preprocess sample records - precheck callchains */ 973 if (perf_session__preprocess_sample(session, event, &sample)) 974 return 0; 975 976 if (tool->ordered_samples) { 977 ret = perf_session_queue_event(session, event, &sample, 978 file_offset); 979 if (ret != -ETIME) 980 return ret; 981 } 982 983 return perf_session_deliver_event(session, event, &sample, tool, 984 file_offset); 985 } 986 987 void perf_event_header__bswap(struct perf_event_header *self) 988 { 989 self->type = bswap_32(self->type); 990 self->misc = bswap_16(self->misc); 991 self->size = bswap_16(self->size); 992 } 993 994 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid) 995 { 996 return machine__findnew_thread(&session->host_machine, pid); 997 } 998 999 static struct thread *perf_session__register_idle_thread(struct perf_session *self) 1000 { 1001 struct thread *thread = perf_session__findnew(self, 0); 1002 1003 if (thread == NULL || thread__set_comm(thread, "swapper")) { 1004 pr_err("problem inserting idle task.\n"); 1005 thread = NULL; 1006 } 1007 1008 return thread; 1009 } 1010 1011 static void perf_session__warn_about_errors(const struct perf_session *session, 1012 const struct perf_tool *tool) 1013 { 1014 if (tool->lost == perf_event__process_lost && 1015 session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) { 1016 ui__warning("Processed %d events and lost %d chunks!\n\n" 1017 "Check IO/CPU overload!\n\n", 1018 session->hists.stats.nr_events[0], 1019 session->hists.stats.nr_events[PERF_RECORD_LOST]); 1020 } 1021 1022 if (session->hists.stats.nr_unknown_events != 0) { 1023 ui__warning("Found %u unknown events!\n\n" 1024 "Is this an older tool processing a perf.data " 1025 "file generated by a more recent tool?\n\n" 1026 "If that is not the case, consider " 1027 "reporting to linux-kernel@vger.kernel.org.\n\n", 1028 session->hists.stats.nr_unknown_events); 1029 } 1030 1031 if (session->hists.stats.nr_unknown_id != 0) { 1032 ui__warning("%u samples with id not present in the header\n", 1033 session->hists.stats.nr_unknown_id); 1034 } 1035 1036 if (session->hists.stats.nr_invalid_chains != 0) { 1037 ui__warning("Found invalid callchains!\n\n" 1038 "%u out of %u events were discarded for this reason.\n\n" 1039 "Consider reporting to linux-kernel@vger.kernel.org.\n\n", 1040 session->hists.stats.nr_invalid_chains, 1041 session->hists.stats.nr_events[PERF_RECORD_SAMPLE]); 1042 } 1043 1044 if (session->hists.stats.nr_unprocessable_samples != 0) { 1045 ui__warning("%u unprocessable samples recorded.\n" 1046 "Do you have a KVM guest running and not using 'perf kvm'?\n", 1047 session->hists.stats.nr_unprocessable_samples); 1048 } 1049 } 1050 1051 #define session_done() (*(volatile int *)(&session_done)) 1052 volatile int session_done; 1053 1054 static int __perf_session__process_pipe_events(struct perf_session *self, 1055 struct perf_tool *tool) 1056 { 1057 union perf_event event; 1058 uint32_t size; 1059 int skip = 0; 1060 u64 head; 1061 int err; 1062 void *p; 1063 1064 perf_tool__fill_defaults(tool); 1065 1066 head = 0; 1067 more: 1068 err = readn(self->fd, &event, sizeof(struct perf_event_header)); 1069 if (err <= 0) { 1070 if (err == 0) 1071 goto done; 1072 1073 pr_err("failed to read event header\n"); 1074 goto out_err; 1075 } 1076 1077 if (self->header.needs_swap) 1078 perf_event_header__bswap(&event.header); 1079 1080 size = event.header.size; 1081 if (size == 0) 1082 size = 8; 1083 1084 p = &event; 1085 p += sizeof(struct perf_event_header); 1086 1087 if (size - sizeof(struct perf_event_header)) { 1088 err = readn(self->fd, p, size - sizeof(struct perf_event_header)); 1089 if (err <= 0) { 1090 if (err == 0) { 1091 pr_err("unexpected end of event stream\n"); 1092 goto done; 1093 } 1094 1095 pr_err("failed to read event data\n"); 1096 goto out_err; 1097 } 1098 } 1099 1100 if ((skip = perf_session__process_event(self, &event, tool, head)) < 0) { 1101 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1102 head, event.header.size, event.header.type); 1103 /* 1104 * assume we lost track of the stream, check alignment, and 1105 * increment a single u64 in the hope to catch on again 'soon'. 1106 */ 1107 if (unlikely(head & 7)) 1108 head &= ~7ULL; 1109 1110 size = 8; 1111 } 1112 1113 head += size; 1114 1115 if (skip > 0) 1116 head += skip; 1117 1118 if (!session_done()) 1119 goto more; 1120 done: 1121 err = 0; 1122 out_err: 1123 perf_session__warn_about_errors(self, tool); 1124 perf_session_free_sample_buffers(self); 1125 return err; 1126 } 1127 1128 static union perf_event * 1129 fetch_mmaped_event(struct perf_session *session, 1130 u64 head, size_t mmap_size, char *buf) 1131 { 1132 union perf_event *event; 1133 1134 /* 1135 * Ensure we have enough space remaining to read 1136 * the size of the event in the headers. 1137 */ 1138 if (head + sizeof(event->header) > mmap_size) 1139 return NULL; 1140 1141 event = (union perf_event *)(buf + head); 1142 1143 if (session->header.needs_swap) 1144 perf_event_header__bswap(&event->header); 1145 1146 if (head + event->header.size > mmap_size) 1147 return NULL; 1148 1149 return event; 1150 } 1151 1152 int __perf_session__process_events(struct perf_session *session, 1153 u64 data_offset, u64 data_size, 1154 u64 file_size, struct perf_tool *tool) 1155 { 1156 u64 head, page_offset, file_offset, file_pos, progress_next; 1157 int err, mmap_prot, mmap_flags, map_idx = 0; 1158 size_t page_size, mmap_size; 1159 char *buf, *mmaps[8]; 1160 union perf_event *event; 1161 uint32_t size; 1162 1163 perf_tool__fill_defaults(tool); 1164 1165 page_size = sysconf(_SC_PAGESIZE); 1166 1167 page_offset = page_size * (data_offset / page_size); 1168 file_offset = page_offset; 1169 head = data_offset - page_offset; 1170 1171 if (data_offset + data_size < file_size) 1172 file_size = data_offset + data_size; 1173 1174 progress_next = file_size / 16; 1175 1176 mmap_size = session->mmap_window; 1177 if (mmap_size > file_size) 1178 mmap_size = file_size; 1179 1180 memset(mmaps, 0, sizeof(mmaps)); 1181 1182 mmap_prot = PROT_READ; 1183 mmap_flags = MAP_SHARED; 1184 1185 if (session->header.needs_swap) { 1186 mmap_prot |= PROT_WRITE; 1187 mmap_flags = MAP_PRIVATE; 1188 } 1189 remap: 1190 buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd, 1191 file_offset); 1192 if (buf == MAP_FAILED) { 1193 pr_err("failed to mmap file\n"); 1194 err = -errno; 1195 goto out_err; 1196 } 1197 mmaps[map_idx] = buf; 1198 map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1); 1199 file_pos = file_offset + head; 1200 1201 more: 1202 event = fetch_mmaped_event(session, head, mmap_size, buf); 1203 if (!event) { 1204 if (mmaps[map_idx]) { 1205 munmap(mmaps[map_idx], mmap_size); 1206 mmaps[map_idx] = NULL; 1207 } 1208 1209 page_offset = page_size * (head / page_size); 1210 file_offset += page_offset; 1211 head -= page_offset; 1212 goto remap; 1213 } 1214 1215 size = event->header.size; 1216 1217 if (size == 0 || 1218 perf_session__process_event(session, event, tool, file_pos) < 0) { 1219 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n", 1220 file_offset + head, event->header.size, 1221 event->header.type); 1222 /* 1223 * assume we lost track of the stream, check alignment, and 1224 * increment a single u64 in the hope to catch on again 'soon'. 1225 */ 1226 if (unlikely(head & 7)) 1227 head &= ~7ULL; 1228 1229 size = 8; 1230 } 1231 1232 head += size; 1233 file_pos += size; 1234 1235 if (file_pos >= progress_next) { 1236 progress_next += file_size / 16; 1237 ui_progress__update(file_pos, file_size, 1238 "Processing events..."); 1239 } 1240 1241 if (file_pos < file_size) 1242 goto more; 1243 1244 err = 0; 1245 /* do the final flush for ordered samples */ 1246 session->ordered_samples.next_flush = ULLONG_MAX; 1247 flush_sample_queue(session, tool); 1248 out_err: 1249 perf_session__warn_about_errors(session, tool); 1250 perf_session_free_sample_buffers(session); 1251 return err; 1252 } 1253 1254 int perf_session__process_events(struct perf_session *self, 1255 struct perf_tool *tool) 1256 { 1257 int err; 1258 1259 if (perf_session__register_idle_thread(self) == NULL) 1260 return -ENOMEM; 1261 1262 if (!self->fd_pipe) 1263 err = __perf_session__process_events(self, 1264 self->header.data_offset, 1265 self->header.data_size, 1266 self->size, tool); 1267 else 1268 err = __perf_session__process_pipe_events(self, tool); 1269 1270 return err; 1271 } 1272 1273 bool perf_session__has_traces(struct perf_session *self, const char *msg) 1274 { 1275 if (!(self->sample_type & PERF_SAMPLE_RAW)) { 1276 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); 1277 return false; 1278 } 1279 1280 return true; 1281 } 1282 1283 int maps__set_kallsyms_ref_reloc_sym(struct map **maps, 1284 const char *symbol_name, u64 addr) 1285 { 1286 char *bracket; 1287 enum map_type i; 1288 struct ref_reloc_sym *ref; 1289 1290 ref = zalloc(sizeof(struct ref_reloc_sym)); 1291 if (ref == NULL) 1292 return -ENOMEM; 1293 1294 ref->name = strdup(symbol_name); 1295 if (ref->name == NULL) { 1296 free(ref); 1297 return -ENOMEM; 1298 } 1299 1300 bracket = strchr(ref->name, ']'); 1301 if (bracket) 1302 *bracket = '\0'; 1303 1304 ref->addr = addr; 1305 1306 for (i = 0; i < MAP__NR_TYPES; ++i) { 1307 struct kmap *kmap = map__kmap(maps[i]); 1308 kmap->ref_reloc_sym = ref; 1309 } 1310 1311 return 0; 1312 } 1313 1314 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp) 1315 { 1316 return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) + 1317 __dsos__fprintf(&self->host_machine.user_dsos, fp) + 1318 machines__fprintf_dsos(&self->machines, fp); 1319 } 1320 1321 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp, 1322 bool with_hits) 1323 { 1324 size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits); 1325 return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits); 1326 } 1327 1328 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp) 1329 { 1330 struct perf_evsel *pos; 1331 size_t ret = fprintf(fp, "Aggregated stats:\n"); 1332 1333 ret += hists__fprintf_nr_events(&session->hists, fp); 1334 1335 list_for_each_entry(pos, &session->evlist->entries, node) { 1336 ret += fprintf(fp, "%s stats:\n", event_name(pos)); 1337 ret += hists__fprintf_nr_events(&pos->hists, fp); 1338 } 1339 1340 return ret; 1341 } 1342 1343 size_t perf_session__fprintf(struct perf_session *session, FILE *fp) 1344 { 1345 /* 1346 * FIXME: Here we have to actually print all the machines in this 1347 * session, not just the host... 1348 */ 1349 return machine__fprintf(&session->host_machine, fp); 1350 } 1351 1352 void perf_session__remove_thread(struct perf_session *session, 1353 struct thread *th) 1354 { 1355 /* 1356 * FIXME: This one makes no sense, we need to remove the thread from 1357 * the machine it belongs to, perf_session can have many machines, so 1358 * doing it always on ->host_machine is wrong. Fix when auditing all 1359 * the 'perf kvm' code. 1360 */ 1361 machine__remove_thread(&session->host_machine, th); 1362 } 1363 1364 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session, 1365 unsigned int type) 1366 { 1367 struct perf_evsel *pos; 1368 1369 list_for_each_entry(pos, &session->evlist->entries, node) { 1370 if (pos->attr.type == type) 1371 return pos; 1372 } 1373 return NULL; 1374 } 1375 1376 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample, 1377 struct machine *machine, struct perf_evsel *evsel, 1378 int print_sym, int print_dso, int print_symoffset) 1379 { 1380 struct addr_location al; 1381 struct callchain_cursor *cursor = &evsel->hists.callchain_cursor; 1382 struct callchain_cursor_node *node; 1383 1384 if (perf_event__preprocess_sample(event, machine, &al, sample, 1385 NULL) < 0) { 1386 error("problem processing %d event, skipping it.\n", 1387 event->header.type); 1388 return; 1389 } 1390 1391 if (symbol_conf.use_callchain && sample->callchain) { 1392 1393 if (machine__resolve_callchain(machine, evsel, al.thread, 1394 sample->callchain, NULL) != 0) { 1395 if (verbose) 1396 error("Failed to resolve callchain. Skipping\n"); 1397 return; 1398 } 1399 callchain_cursor_commit(cursor); 1400 1401 while (1) { 1402 node = callchain_cursor_current(cursor); 1403 if (!node) 1404 break; 1405 1406 printf("\t%16" PRIx64, node->ip); 1407 if (print_sym) { 1408 printf(" "); 1409 symbol__fprintf_symname(node->sym, stdout); 1410 } 1411 if (print_dso) { 1412 printf(" ("); 1413 map__fprintf_dsoname(al.map, stdout); 1414 printf(")"); 1415 } 1416 printf("\n"); 1417 1418 callchain_cursor_advance(cursor); 1419 } 1420 1421 } else { 1422 printf("%16" PRIx64, sample->ip); 1423 if (print_sym) { 1424 printf(" "); 1425 if (print_symoffset) 1426 symbol__fprintf_symname_offs(al.sym, &al, 1427 stdout); 1428 else 1429 symbol__fprintf_symname(al.sym, stdout); 1430 } 1431 1432 if (print_dso) { 1433 printf(" ("); 1434 map__fprintf_dsoname(al.map, stdout); 1435 printf(")"); 1436 } 1437 } 1438 } 1439 1440 int perf_session__cpu_bitmap(struct perf_session *session, 1441 const char *cpu_list, unsigned long *cpu_bitmap) 1442 { 1443 int i; 1444 struct cpu_map *map; 1445 1446 for (i = 0; i < PERF_TYPE_MAX; ++i) { 1447 struct perf_evsel *evsel; 1448 1449 evsel = perf_session__find_first_evtype(session, i); 1450 if (!evsel) 1451 continue; 1452 1453 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) { 1454 pr_err("File does not contain CPU events. " 1455 "Remove -c option to proceed.\n"); 1456 return -1; 1457 } 1458 } 1459 1460 map = cpu_map__new(cpu_list); 1461 if (map == NULL) { 1462 pr_err("Invalid cpu_list\n"); 1463 return -1; 1464 } 1465 1466 for (i = 0; i < map->nr; i++) { 1467 int cpu = map->map[i]; 1468 1469 if (cpu >= MAX_NR_CPUS) { 1470 pr_err("Requested CPU %d too large. " 1471 "Consider raising MAX_NR_CPUS\n", cpu); 1472 return -1; 1473 } 1474 1475 set_bit(cpu, cpu_bitmap); 1476 } 1477 1478 return 0; 1479 } 1480 1481 void perf_session__fprintf_info(struct perf_session *session, FILE *fp, 1482 bool full) 1483 { 1484 struct stat st; 1485 int ret; 1486 1487 if (session == NULL || fp == NULL) 1488 return; 1489 1490 ret = fstat(session->fd, &st); 1491 if (ret == -1) 1492 return; 1493 1494 fprintf(fp, "# ========\n"); 1495 fprintf(fp, "# captured on: %s", ctime(&st.st_ctime)); 1496 perf_header__fprintf_info(session, fp, full); 1497 fprintf(fp, "# ========\n#\n"); 1498 } 1499