1 /* 2 * builtin-top.c 3 * 4 * Builtin top command: Display a continuously updated profile of 5 * any workload, CPU or specific PID. 6 * 7 * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com> 8 * 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 9 * 10 * Improvements and fixes by: 11 * 12 * Arjan van de Ven <arjan@linux.intel.com> 13 * Yanmin Zhang <yanmin.zhang@intel.com> 14 * Wu Fengguang <fengguang.wu@intel.com> 15 * Mike Galbraith <efault@gmx.de> 16 * Paul Mackerras <paulus@samba.org> 17 * 18 * Released under the GPL v2. (and only v2, not any later version) 19 */ 20 #include "builtin.h" 21 22 #include "perf.h" 23 24 #include "util/annotate.h" 25 #include "util/cache.h" 26 #include "util/color.h" 27 #include "util/evlist.h" 28 #include "util/evsel.h" 29 #include "util/session.h" 30 #include "util/symbol.h" 31 #include "util/thread.h" 32 #include "util/thread_map.h" 33 #include "util/top.h" 34 #include "util/util.h" 35 #include <linux/rbtree.h> 36 #include "util/parse-options.h" 37 #include "util/parse-events.h" 38 #include "util/cpumap.h" 39 #include "util/xyarray.h" 40 #include "util/sort.h" 41 42 #include "util/debug.h" 43 44 #include <assert.h> 45 #include <fcntl.h> 46 47 #include <stdio.h> 48 #include <termios.h> 49 #include <unistd.h> 50 #include <inttypes.h> 51 52 #include <errno.h> 53 #include <time.h> 54 #include <sched.h> 55 56 #include <sys/syscall.h> 57 #include <sys/ioctl.h> 58 #include <sys/poll.h> 59 #include <sys/prctl.h> 60 #include <sys/wait.h> 61 #include <sys/uio.h> 62 #include <sys/mman.h> 63 64 #include <linux/unistd.h> 65 #include <linux/types.h> 66 67 68 void get_term_dimensions(struct winsize *ws) 69 { 70 char *s = getenv("LINES"); 71 72 if (s != NULL) { 73 ws->ws_row = atoi(s); 74 s = getenv("COLUMNS"); 75 if (s != NULL) { 76 ws->ws_col = atoi(s); 77 if (ws->ws_row && ws->ws_col) 78 return; 79 } 80 } 81 #ifdef TIOCGWINSZ 82 if (ioctl(1, TIOCGWINSZ, ws) == 0 && 83 ws->ws_row && ws->ws_col) 84 return; 85 #endif 86 ws->ws_row = 25; 87 ws->ws_col = 80; 88 } 89 90 static void perf_top__update_print_entries(struct perf_top *top) 91 { 92 if (top->print_entries > 9) 93 top->print_entries -= 9; 94 } 95 96 static void perf_top__sig_winch(int sig __used, siginfo_t *info __used, void *arg) 97 { 98 struct perf_top *top = arg; 99 100 get_term_dimensions(&top->winsize); 101 if (!top->print_entries 102 || (top->print_entries+4) > top->winsize.ws_row) { 103 top->print_entries = top->winsize.ws_row; 104 } else { 105 top->print_entries += 4; 106 top->winsize.ws_row = top->print_entries; 107 } 108 perf_top__update_print_entries(top); 109 } 110 111 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he) 112 { 113 struct symbol *sym; 114 struct annotation *notes; 115 struct map *map; 116 int err = -1; 117 118 if (!he || !he->ms.sym) 119 return -1; 120 121 sym = he->ms.sym; 122 map = he->ms.map; 123 124 /* 125 * We can't annotate with just /proc/kallsyms 126 */ 127 if (map->dso->symtab_type == SYMTAB__KALLSYMS) { 128 pr_err("Can't annotate %s: No vmlinux file was found in the " 129 "path\n", sym->name); 130 sleep(1); 131 return -1; 132 } 133 134 notes = symbol__annotation(sym); 135 if (notes->src != NULL) { 136 pthread_mutex_lock(¬es->lock); 137 goto out_assign; 138 } 139 140 pthread_mutex_lock(¬es->lock); 141 142 if (symbol__alloc_hist(sym) < 0) { 143 pthread_mutex_unlock(¬es->lock); 144 pr_err("Not enough memory for annotating '%s' symbol!\n", 145 sym->name); 146 sleep(1); 147 return err; 148 } 149 150 err = symbol__annotate(sym, map, 0); 151 if (err == 0) { 152 out_assign: 153 top->sym_filter_entry = he; 154 } 155 156 pthread_mutex_unlock(¬es->lock); 157 return err; 158 } 159 160 static void __zero_source_counters(struct hist_entry *he) 161 { 162 struct symbol *sym = he->ms.sym; 163 symbol__annotate_zero_histograms(sym); 164 } 165 166 static void perf_top__record_precise_ip(struct perf_top *top, 167 struct hist_entry *he, 168 int counter, u64 ip) 169 { 170 struct annotation *notes; 171 struct symbol *sym; 172 173 if (he == NULL || he->ms.sym == NULL || 174 ((top->sym_filter_entry == NULL || 175 top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1)) 176 return; 177 178 sym = he->ms.sym; 179 notes = symbol__annotation(sym); 180 181 if (pthread_mutex_trylock(¬es->lock)) 182 return; 183 184 if (notes->src == NULL && symbol__alloc_hist(sym) < 0) { 185 pthread_mutex_unlock(¬es->lock); 186 pr_err("Not enough memory for annotating '%s' symbol!\n", 187 sym->name); 188 sleep(1); 189 return; 190 } 191 192 ip = he->ms.map->map_ip(he->ms.map, ip); 193 symbol__inc_addr_samples(sym, he->ms.map, counter, ip); 194 195 pthread_mutex_unlock(¬es->lock); 196 } 197 198 static void perf_top__show_details(struct perf_top *top) 199 { 200 struct hist_entry *he = top->sym_filter_entry; 201 struct annotation *notes; 202 struct symbol *symbol; 203 int more; 204 205 if (!he) 206 return; 207 208 symbol = he->ms.sym; 209 notes = symbol__annotation(symbol); 210 211 pthread_mutex_lock(¬es->lock); 212 213 if (notes->src == NULL) 214 goto out_unlock; 215 216 printf("Showing %s for %s\n", event_name(top->sym_evsel), symbol->name); 217 printf(" Events Pcnt (>=%d%%)\n", top->sym_pcnt_filter); 218 219 more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel->idx, 220 0, top->sym_pcnt_filter, top->print_entries, 4); 221 if (top->zero) 222 symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx); 223 else 224 symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx); 225 if (more != 0) 226 printf("%d lines not displayed, maybe increase display entries [e]\n", more); 227 out_unlock: 228 pthread_mutex_unlock(¬es->lock); 229 } 230 231 static const char CONSOLE_CLEAR[] = "[H[2J"; 232 233 static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel, 234 struct addr_location *al, 235 struct perf_sample *sample) 236 { 237 struct hist_entry *he; 238 239 he = __hists__add_entry(&evsel->hists, al, NULL, sample->period); 240 if (he == NULL) 241 return NULL; 242 243 hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE); 244 return he; 245 } 246 247 static void perf_top__print_sym_table(struct perf_top *top) 248 { 249 char bf[160]; 250 int printed = 0; 251 const int win_width = top->winsize.ws_col - 1; 252 253 puts(CONSOLE_CLEAR); 254 255 perf_top__header_snprintf(top, bf, sizeof(bf)); 256 printf("%s\n", bf); 257 258 perf_top__reset_sample_counters(top); 259 260 printf("%-*.*s\n", win_width, win_width, graph_dotted_line); 261 262 if (top->sym_evsel->hists.stats.nr_lost_warned != 263 top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) { 264 top->sym_evsel->hists.stats.nr_lost_warned = 265 top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]; 266 color_fprintf(stdout, PERF_COLOR_RED, 267 "WARNING: LOST %d chunks, Check IO/CPU overload", 268 top->sym_evsel->hists.stats.nr_lost_warned); 269 ++printed; 270 } 271 272 if (top->sym_filter_entry) { 273 perf_top__show_details(top); 274 return; 275 } 276 277 hists__collapse_resort_threaded(&top->sym_evsel->hists); 278 hists__output_resort_threaded(&top->sym_evsel->hists); 279 hists__decay_entries_threaded(&top->sym_evsel->hists, 280 top->hide_user_symbols, 281 top->hide_kernel_symbols); 282 hists__output_recalc_col_len(&top->sym_evsel->hists, 283 top->winsize.ws_row - 3); 284 putchar('\n'); 285 hists__fprintf(&top->sym_evsel->hists, NULL, false, false, 286 top->winsize.ws_row - 4 - printed, win_width, stdout); 287 } 288 289 static void prompt_integer(int *target, const char *msg) 290 { 291 char *buf = malloc(0), *p; 292 size_t dummy = 0; 293 int tmp; 294 295 fprintf(stdout, "\n%s: ", msg); 296 if (getline(&buf, &dummy, stdin) < 0) 297 return; 298 299 p = strchr(buf, '\n'); 300 if (p) 301 *p = 0; 302 303 p = buf; 304 while(*p) { 305 if (!isdigit(*p)) 306 goto out_free; 307 p++; 308 } 309 tmp = strtoul(buf, NULL, 10); 310 *target = tmp; 311 out_free: 312 free(buf); 313 } 314 315 static void prompt_percent(int *target, const char *msg) 316 { 317 int tmp = 0; 318 319 prompt_integer(&tmp, msg); 320 if (tmp >= 0 && tmp <= 100) 321 *target = tmp; 322 } 323 324 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg) 325 { 326 char *buf = malloc(0), *p; 327 struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL; 328 struct rb_node *next; 329 size_t dummy = 0; 330 331 /* zero counters of active symbol */ 332 if (syme) { 333 __zero_source_counters(syme); 334 top->sym_filter_entry = NULL; 335 } 336 337 fprintf(stdout, "\n%s: ", msg); 338 if (getline(&buf, &dummy, stdin) < 0) 339 goto out_free; 340 341 p = strchr(buf, '\n'); 342 if (p) 343 *p = 0; 344 345 next = rb_first(&top->sym_evsel->hists.entries); 346 while (next) { 347 n = rb_entry(next, struct hist_entry, rb_node); 348 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) { 349 found = n; 350 break; 351 } 352 next = rb_next(&n->rb_node); 353 } 354 355 if (!found) { 356 fprintf(stderr, "Sorry, %s is not active.\n", buf); 357 sleep(1); 358 } else 359 perf_top__parse_source(top, found); 360 361 out_free: 362 free(buf); 363 } 364 365 static void perf_top__print_mapped_keys(struct perf_top *top) 366 { 367 char *name = NULL; 368 369 if (top->sym_filter_entry) { 370 struct symbol *sym = top->sym_filter_entry->ms.sym; 371 name = sym->name; 372 } 373 374 fprintf(stdout, "\nMapped keys:\n"); 375 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", top->delay_secs); 376 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", top->print_entries); 377 378 if (top->evlist->nr_entries > 1) 379 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(top->sym_evsel)); 380 381 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", top->count_filter); 382 383 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter); 384 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL"); 385 fprintf(stdout, "\t[S] stop annotation.\n"); 386 387 fprintf(stdout, 388 "\t[K] hide kernel_symbols symbols. \t(%s)\n", 389 top->hide_kernel_symbols ? "yes" : "no"); 390 fprintf(stdout, 391 "\t[U] hide user symbols. \t(%s)\n", 392 top->hide_user_symbols ? "yes" : "no"); 393 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", top->zero ? 1 : 0); 394 fprintf(stdout, "\t[qQ] quit.\n"); 395 } 396 397 static int perf_top__key_mapped(struct perf_top *top, int c) 398 { 399 switch (c) { 400 case 'd': 401 case 'e': 402 case 'f': 403 case 'z': 404 case 'q': 405 case 'Q': 406 case 'K': 407 case 'U': 408 case 'F': 409 case 's': 410 case 'S': 411 return 1; 412 case 'E': 413 return top->evlist->nr_entries > 1 ? 1 : 0; 414 default: 415 break; 416 } 417 418 return 0; 419 } 420 421 static void perf_top__handle_keypress(struct perf_top *top, int c) 422 { 423 if (!perf_top__key_mapped(top, c)) { 424 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN }; 425 struct termios tc, save; 426 427 perf_top__print_mapped_keys(top); 428 fprintf(stdout, "\nEnter selection, or unmapped key to continue: "); 429 fflush(stdout); 430 431 tcgetattr(0, &save); 432 tc = save; 433 tc.c_lflag &= ~(ICANON | ECHO); 434 tc.c_cc[VMIN] = 0; 435 tc.c_cc[VTIME] = 0; 436 tcsetattr(0, TCSANOW, &tc); 437 438 poll(&stdin_poll, 1, -1); 439 c = getc(stdin); 440 441 tcsetattr(0, TCSAFLUSH, &save); 442 if (!perf_top__key_mapped(top, c)) 443 return; 444 } 445 446 switch (c) { 447 case 'd': 448 prompt_integer(&top->delay_secs, "Enter display delay"); 449 if (top->delay_secs < 1) 450 top->delay_secs = 1; 451 break; 452 case 'e': 453 prompt_integer(&top->print_entries, "Enter display entries (lines)"); 454 if (top->print_entries == 0) { 455 struct sigaction act = { 456 .sa_sigaction = perf_top__sig_winch, 457 .sa_flags = SA_SIGINFO, 458 }; 459 perf_top__sig_winch(SIGWINCH, NULL, top); 460 sigaction(SIGWINCH, &act, NULL); 461 } else { 462 perf_top__sig_winch(SIGWINCH, NULL, top); 463 signal(SIGWINCH, SIG_DFL); 464 } 465 break; 466 case 'E': 467 if (top->evlist->nr_entries > 1) { 468 /* Select 0 as the default event: */ 469 int counter = 0; 470 471 fprintf(stderr, "\nAvailable events:"); 472 473 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node) 474 fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, event_name(top->sym_evsel)); 475 476 prompt_integer(&counter, "Enter details event counter"); 477 478 if (counter >= top->evlist->nr_entries) { 479 top->sym_evsel = list_entry(top->evlist->entries.next, struct perf_evsel, node); 480 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(top->sym_evsel)); 481 sleep(1); 482 break; 483 } 484 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node) 485 if (top->sym_evsel->idx == counter) 486 break; 487 } else 488 top->sym_evsel = list_entry(top->evlist->entries.next, struct perf_evsel, node); 489 break; 490 case 'f': 491 prompt_integer(&top->count_filter, "Enter display event count filter"); 492 break; 493 case 'F': 494 prompt_percent(&top->sym_pcnt_filter, 495 "Enter details display event filter (percent)"); 496 break; 497 case 'K': 498 top->hide_kernel_symbols = !top->hide_kernel_symbols; 499 break; 500 case 'q': 501 case 'Q': 502 printf("exiting.\n"); 503 if (top->dump_symtab) 504 perf_session__fprintf_dsos(top->session, stderr); 505 exit(0); 506 case 's': 507 perf_top__prompt_symbol(top, "Enter details symbol"); 508 break; 509 case 'S': 510 if (!top->sym_filter_entry) 511 break; 512 else { 513 struct hist_entry *syme = top->sym_filter_entry; 514 515 top->sym_filter_entry = NULL; 516 __zero_source_counters(syme); 517 } 518 break; 519 case 'U': 520 top->hide_user_symbols = !top->hide_user_symbols; 521 break; 522 case 'z': 523 top->zero = !top->zero; 524 break; 525 default: 526 break; 527 } 528 } 529 530 static void perf_top__sort_new_samples(void *arg) 531 { 532 struct perf_top *t = arg; 533 perf_top__reset_sample_counters(t); 534 535 if (t->evlist->selected != NULL) 536 t->sym_evsel = t->evlist->selected; 537 538 hists__collapse_resort_threaded(&t->sym_evsel->hists); 539 hists__output_resort_threaded(&t->sym_evsel->hists); 540 hists__decay_entries_threaded(&t->sym_evsel->hists, 541 t->hide_user_symbols, 542 t->hide_kernel_symbols); 543 } 544 545 static void *display_thread_tui(void *arg) 546 { 547 struct perf_top *top = arg; 548 const char *help = "For a higher level overview, try: perf top --sort comm,dso"; 549 550 perf_top__sort_new_samples(top); 551 perf_evlist__tui_browse_hists(top->evlist, help, 552 perf_top__sort_new_samples, 553 top, top->delay_secs); 554 555 exit_browser(0); 556 exit(0); 557 return NULL; 558 } 559 560 static void *display_thread(void *arg) 561 { 562 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN }; 563 struct termios tc, save; 564 struct perf_top *top = arg; 565 int delay_msecs, c; 566 567 tcgetattr(0, &save); 568 tc = save; 569 tc.c_lflag &= ~(ICANON | ECHO); 570 tc.c_cc[VMIN] = 0; 571 tc.c_cc[VTIME] = 0; 572 573 pthread__unblock_sigwinch(); 574 repeat: 575 delay_msecs = top->delay_secs * 1000; 576 tcsetattr(0, TCSANOW, &tc); 577 /* trash return*/ 578 getc(stdin); 579 580 while (1) { 581 perf_top__print_sym_table(top); 582 /* 583 * Either timeout expired or we got an EINTR due to SIGWINCH, 584 * refresh screen in both cases. 585 */ 586 switch (poll(&stdin_poll, 1, delay_msecs)) { 587 case 0: 588 continue; 589 case -1: 590 if (errno == EINTR) 591 continue; 592 /* Fall trhu */ 593 default: 594 goto process_hotkey; 595 } 596 } 597 process_hotkey: 598 c = getc(stdin); 599 tcsetattr(0, TCSAFLUSH, &save); 600 601 perf_top__handle_keypress(top, c); 602 goto repeat; 603 604 return NULL; 605 } 606 607 /* Tag samples to be skipped. */ 608 static const char *skip_symbols[] = { 609 "default_idle", 610 "native_safe_halt", 611 "cpu_idle", 612 "enter_idle", 613 "exit_idle", 614 "mwait_idle", 615 "mwait_idle_with_hints", 616 "poll_idle", 617 "ppc64_runlatch_off", 618 "pseries_dedicated_idle_sleep", 619 NULL 620 }; 621 622 static int symbol_filter(struct map *map __used, struct symbol *sym) 623 { 624 const char *name = sym->name; 625 int i; 626 627 /* 628 * ppc64 uses function descriptors and appends a '.' to the 629 * start of every instruction address. Remove it. 630 */ 631 if (name[0] == '.') 632 name++; 633 634 if (!strcmp(name, "_text") || 635 !strcmp(name, "_etext") || 636 !strcmp(name, "_sinittext") || 637 !strncmp("init_module", name, 11) || 638 !strncmp("cleanup_module", name, 14) || 639 strstr(name, "_text_start") || 640 strstr(name, "_text_end")) 641 return 1; 642 643 for (i = 0; skip_symbols[i]; i++) { 644 if (!strcmp(skip_symbols[i], name)) { 645 sym->ignore = true; 646 break; 647 } 648 } 649 650 return 0; 651 } 652 653 static void perf_event__process_sample(struct perf_tool *tool, 654 const union perf_event *event, 655 struct perf_evsel *evsel, 656 struct perf_sample *sample, 657 struct machine *machine) 658 { 659 struct perf_top *top = container_of(tool, struct perf_top, tool); 660 struct symbol *parent = NULL; 661 u64 ip = event->ip.ip; 662 struct addr_location al; 663 int err; 664 665 if (!machine && perf_guest) { 666 pr_err("Can't find guest [%d]'s kernel information\n", 667 event->ip.pid); 668 return; 669 } 670 671 if (event->header.misc & PERF_RECORD_MISC_EXACT_IP) 672 top->exact_samples++; 673 674 if (perf_event__preprocess_sample(event, machine, &al, sample, 675 symbol_filter) < 0 || 676 al.filtered) 677 return; 678 679 if (!top->kptr_restrict_warned && 680 symbol_conf.kptr_restrict && 681 al.cpumode == PERF_RECORD_MISC_KERNEL) { 682 ui__warning( 683 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n" 684 "Check /proc/sys/kernel/kptr_restrict.\n\n" 685 "Kernel%s samples will not be resolved.\n", 686 !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ? 687 " modules" : ""); 688 if (use_browser <= 0) 689 sleep(5); 690 top->kptr_restrict_warned = true; 691 } 692 693 if (al.sym == NULL) { 694 const char *msg = "Kernel samples will not be resolved.\n"; 695 /* 696 * As we do lazy loading of symtabs we only will know if the 697 * specified vmlinux file is invalid when we actually have a 698 * hit in kernel space and then try to load it. So if we get 699 * here and there are _no_ symbols in the DSO backing the 700 * kernel map, bail out. 701 * 702 * We may never get here, for instance, if we use -K/ 703 * --hide-kernel-symbols, even if the user specifies an 704 * invalid --vmlinux ;-) 705 */ 706 if (!top->kptr_restrict_warned && !top->vmlinux_warned && 707 al.map == machine->vmlinux_maps[MAP__FUNCTION] && 708 RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) { 709 if (symbol_conf.vmlinux_name) { 710 ui__warning("The %s file can't be used.\n%s", 711 symbol_conf.vmlinux_name, msg); 712 } else { 713 ui__warning("A vmlinux file was not found.\n%s", 714 msg); 715 } 716 717 if (use_browser <= 0) 718 sleep(5); 719 top->vmlinux_warned = true; 720 } 721 } 722 723 if (al.sym == NULL || !al.sym->ignore) { 724 struct hist_entry *he; 725 726 if ((sort__has_parent || symbol_conf.use_callchain) && 727 sample->callchain) { 728 err = machine__resolve_callchain(machine, evsel, al.thread, 729 sample->callchain, &parent); 730 if (err) 731 return; 732 } 733 734 he = perf_evsel__add_hist_entry(evsel, &al, sample); 735 if (he == NULL) { 736 pr_err("Problem incrementing symbol period, skipping event\n"); 737 return; 738 } 739 740 if (symbol_conf.use_callchain) { 741 err = callchain_append(he->callchain, &evsel->hists.callchain_cursor, 742 sample->period); 743 if (err) 744 return; 745 } 746 747 if (top->sort_has_symbols) 748 perf_top__record_precise_ip(top, he, evsel->idx, ip); 749 } 750 751 return; 752 } 753 754 static void perf_top__mmap_read_idx(struct perf_top *top, int idx) 755 { 756 struct perf_sample sample; 757 struct perf_evsel *evsel; 758 struct perf_session *session = top->session; 759 union perf_event *event; 760 struct machine *machine; 761 u8 origin; 762 int ret; 763 764 while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) { 765 ret = perf_session__parse_sample(session, event, &sample); 766 if (ret) { 767 pr_err("Can't parse sample, err = %d\n", ret); 768 continue; 769 } 770 771 evsel = perf_evlist__id2evsel(session->evlist, sample.id); 772 assert(evsel != NULL); 773 774 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 775 776 if (event->header.type == PERF_RECORD_SAMPLE) 777 ++top->samples; 778 779 switch (origin) { 780 case PERF_RECORD_MISC_USER: 781 ++top->us_samples; 782 if (top->hide_user_symbols) 783 continue; 784 machine = perf_session__find_host_machine(session); 785 break; 786 case PERF_RECORD_MISC_KERNEL: 787 ++top->kernel_samples; 788 if (top->hide_kernel_symbols) 789 continue; 790 machine = perf_session__find_host_machine(session); 791 break; 792 case PERF_RECORD_MISC_GUEST_KERNEL: 793 ++top->guest_kernel_samples; 794 machine = perf_session__find_machine(session, event->ip.pid); 795 break; 796 case PERF_RECORD_MISC_GUEST_USER: 797 ++top->guest_us_samples; 798 /* 799 * TODO: we don't process guest user from host side 800 * except simple counting. 801 */ 802 /* Fall thru */ 803 default: 804 continue; 805 } 806 807 808 if (event->header.type == PERF_RECORD_SAMPLE) { 809 perf_event__process_sample(&top->tool, event, evsel, 810 &sample, machine); 811 } else if (event->header.type < PERF_RECORD_MAX) { 812 hists__inc_nr_events(&evsel->hists, event->header.type); 813 perf_event__process(&top->tool, event, &sample, machine); 814 } else 815 ++session->hists.stats.nr_unknown_events; 816 } 817 } 818 819 static void perf_top__mmap_read(struct perf_top *top) 820 { 821 int i; 822 823 for (i = 0; i < top->evlist->nr_mmaps; i++) 824 perf_top__mmap_read_idx(top, i); 825 } 826 827 static void perf_top__start_counters(struct perf_top *top) 828 { 829 struct perf_evsel *counter, *first; 830 struct perf_evlist *evlist = top->evlist; 831 832 first = list_entry(evlist->entries.next, struct perf_evsel, node); 833 834 list_for_each_entry(counter, &evlist->entries, node) { 835 struct perf_event_attr *attr = &counter->attr; 836 struct xyarray *group_fd = NULL; 837 838 if (top->group && counter != first) 839 group_fd = first->fd; 840 841 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; 842 843 if (top->freq) { 844 attr->sample_type |= PERF_SAMPLE_PERIOD; 845 attr->freq = 1; 846 attr->sample_freq = top->freq; 847 } 848 849 if (evlist->nr_entries > 1) { 850 attr->sample_type |= PERF_SAMPLE_ID; 851 attr->read_format |= PERF_FORMAT_ID; 852 } 853 854 if (symbol_conf.use_callchain) 855 attr->sample_type |= PERF_SAMPLE_CALLCHAIN; 856 857 attr->mmap = 1; 858 attr->comm = 1; 859 attr->inherit = top->inherit; 860 fallback_missing_features: 861 if (top->exclude_guest_missing) 862 attr->exclude_guest = attr->exclude_host = 0; 863 retry_sample_id: 864 attr->sample_id_all = top->sample_id_all_avail ? 1 : 0; 865 try_again: 866 if (perf_evsel__open(counter, top->evlist->cpus, 867 top->evlist->threads, top->group, 868 group_fd) < 0) { 869 int err = errno; 870 871 if (err == EPERM || err == EACCES) { 872 ui__error_paranoid(); 873 goto out_err; 874 } else if (err == EINVAL) { 875 if (!top->exclude_guest_missing && 876 (attr->exclude_guest || attr->exclude_host)) { 877 pr_debug("Old kernel, cannot exclude " 878 "guest or host samples.\n"); 879 top->exclude_guest_missing = true; 880 goto fallback_missing_features; 881 } else if (top->sample_id_all_avail) { 882 /* 883 * Old kernel, no attr->sample_id_type_all field 884 */ 885 top->sample_id_all_avail = false; 886 goto retry_sample_id; 887 } 888 } 889 /* 890 * If it's cycles then fall back to hrtimer 891 * based cpu-clock-tick sw counter, which 892 * is always available even if no PMU support: 893 */ 894 if (attr->type == PERF_TYPE_HARDWARE && 895 attr->config == PERF_COUNT_HW_CPU_CYCLES) { 896 if (verbose) 897 ui__warning("Cycles event not supported,\n" 898 "trying to fall back to cpu-clock-ticks\n"); 899 900 attr->type = PERF_TYPE_SOFTWARE; 901 attr->config = PERF_COUNT_SW_CPU_CLOCK; 902 goto try_again; 903 } 904 905 if (err == ENOENT) { 906 ui__warning("The %s event is not supported.\n", 907 event_name(counter)); 908 goto out_err; 909 } else if (err == EMFILE) { 910 ui__warning("Too many events are opened.\n" 911 "Try again after reducing the number of events\n"); 912 goto out_err; 913 } 914 915 ui__warning("The sys_perf_event_open() syscall " 916 "returned with %d (%s). /bin/dmesg " 917 "may provide additional information.\n" 918 "No CONFIG_PERF_EVENTS=y kernel support " 919 "configured?\n", err, strerror(err)); 920 goto out_err; 921 } 922 } 923 924 if (perf_evlist__mmap(evlist, top->mmap_pages, false) < 0) { 925 ui__warning("Failed to mmap with %d (%s)\n", 926 errno, strerror(errno)); 927 goto out_err; 928 } 929 930 return; 931 932 out_err: 933 exit_browser(0); 934 exit(0); 935 } 936 937 static int perf_top__setup_sample_type(struct perf_top *top) 938 { 939 if (!top->sort_has_symbols) { 940 if (symbol_conf.use_callchain) { 941 ui__warning("Selected -g but \"sym\" not present in --sort/-s."); 942 return -EINVAL; 943 } 944 } else if (!top->dont_use_callchains && callchain_param.mode != CHAIN_NONE) { 945 if (callchain_register_param(&callchain_param) < 0) { 946 ui__warning("Can't register callchain params.\n"); 947 return -EINVAL; 948 } 949 } 950 951 return 0; 952 } 953 954 static int __cmd_top(struct perf_top *top) 955 { 956 pthread_t thread; 957 int ret; 958 /* 959 * FIXME: perf_session__new should allow passing a O_MMAP, so that all this 960 * mmap reading, etc is encapsulated in it. Use O_WRONLY for now. 961 */ 962 top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL); 963 if (top->session == NULL) 964 return -ENOMEM; 965 966 ret = perf_top__setup_sample_type(top); 967 if (ret) 968 goto out_delete; 969 970 if (top->target_tid != -1) 971 perf_event__synthesize_thread_map(&top->tool, top->evlist->threads, 972 perf_event__process, 973 &top->session->host_machine); 974 else 975 perf_event__synthesize_threads(&top->tool, perf_event__process, 976 &top->session->host_machine); 977 perf_top__start_counters(top); 978 top->session->evlist = top->evlist; 979 perf_session__update_sample_type(top->session); 980 981 /* Wait for a minimal set of events before starting the snapshot */ 982 poll(top->evlist->pollfd, top->evlist->nr_fds, 100); 983 984 perf_top__mmap_read(top); 985 986 if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui : 987 display_thread), top)) { 988 printf("Could not create display thread.\n"); 989 exit(-1); 990 } 991 992 if (top->realtime_prio) { 993 struct sched_param param; 994 995 param.sched_priority = top->realtime_prio; 996 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { 997 printf("Could not set realtime priority.\n"); 998 exit(-1); 999 } 1000 } 1001 1002 while (1) { 1003 u64 hits = top->samples; 1004 1005 perf_top__mmap_read(top); 1006 1007 if (hits == top->samples) 1008 ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100); 1009 } 1010 1011 out_delete: 1012 perf_session__delete(top->session); 1013 top->session = NULL; 1014 1015 return 0; 1016 } 1017 1018 static int 1019 parse_callchain_opt(const struct option *opt, const char *arg, int unset) 1020 { 1021 struct perf_top *top = (struct perf_top *)opt->value; 1022 char *tok, *tok2; 1023 char *endptr; 1024 1025 /* 1026 * --no-call-graph 1027 */ 1028 if (unset) { 1029 top->dont_use_callchains = true; 1030 return 0; 1031 } 1032 1033 symbol_conf.use_callchain = true; 1034 1035 if (!arg) 1036 return 0; 1037 1038 tok = strtok((char *)arg, ","); 1039 if (!tok) 1040 return -1; 1041 1042 /* get the output mode */ 1043 if (!strncmp(tok, "graph", strlen(arg))) 1044 callchain_param.mode = CHAIN_GRAPH_ABS; 1045 1046 else if (!strncmp(tok, "flat", strlen(arg))) 1047 callchain_param.mode = CHAIN_FLAT; 1048 1049 else if (!strncmp(tok, "fractal", strlen(arg))) 1050 callchain_param.mode = CHAIN_GRAPH_REL; 1051 1052 else if (!strncmp(tok, "none", strlen(arg))) { 1053 callchain_param.mode = CHAIN_NONE; 1054 symbol_conf.use_callchain = false; 1055 1056 return 0; 1057 } else 1058 return -1; 1059 1060 /* get the min percentage */ 1061 tok = strtok(NULL, ","); 1062 if (!tok) 1063 goto setup; 1064 1065 callchain_param.min_percent = strtod(tok, &endptr); 1066 if (tok == endptr) 1067 return -1; 1068 1069 /* get the print limit */ 1070 tok2 = strtok(NULL, ","); 1071 if (!tok2) 1072 goto setup; 1073 1074 if (tok2[0] != 'c') { 1075 callchain_param.print_limit = strtod(tok2, &endptr); 1076 tok2 = strtok(NULL, ","); 1077 if (!tok2) 1078 goto setup; 1079 } 1080 1081 /* get the call chain order */ 1082 if (!strcmp(tok2, "caller")) 1083 callchain_param.order = ORDER_CALLER; 1084 else if (!strcmp(tok2, "callee")) 1085 callchain_param.order = ORDER_CALLEE; 1086 else 1087 return -1; 1088 setup: 1089 if (callchain_register_param(&callchain_param) < 0) { 1090 fprintf(stderr, "Can't register callchain params\n"); 1091 return -1; 1092 } 1093 return 0; 1094 } 1095 1096 static const char * const top_usage[] = { 1097 "perf top [<options>]", 1098 NULL 1099 }; 1100 1101 int cmd_top(int argc, const char **argv, const char *prefix __used) 1102 { 1103 struct perf_evsel *pos; 1104 int status = -ENOMEM; 1105 struct perf_top top = { 1106 .count_filter = 5, 1107 .delay_secs = 2, 1108 .target_pid = -1, 1109 .target_tid = -1, 1110 .freq = 1000, /* 1 KHz */ 1111 .sample_id_all_avail = true, 1112 .mmap_pages = 128, 1113 .sym_pcnt_filter = 5, 1114 }; 1115 char callchain_default_opt[] = "fractal,0.5,callee"; 1116 const struct option options[] = { 1117 OPT_CALLBACK('e', "event", &top.evlist, "event", 1118 "event selector. use 'perf list' to list available events", 1119 parse_events_option), 1120 OPT_INTEGER('c', "count", &top.default_interval, 1121 "event period to sample"), 1122 OPT_INTEGER('p', "pid", &top.target_pid, 1123 "profile events on existing process id"), 1124 OPT_INTEGER('t', "tid", &top.target_tid, 1125 "profile events on existing thread id"), 1126 OPT_BOOLEAN('a', "all-cpus", &top.system_wide, 1127 "system-wide collection from all CPUs"), 1128 OPT_STRING('C', "cpu", &top.cpu_list, "cpu", 1129 "list of cpus to monitor"), 1130 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, 1131 "file", "vmlinux pathname"), 1132 OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols, 1133 "hide kernel symbols"), 1134 OPT_UINTEGER('m', "mmap-pages", &top.mmap_pages, "number of mmap data pages"), 1135 OPT_INTEGER('r', "realtime", &top.realtime_prio, 1136 "collect data with this RT SCHED_FIFO priority"), 1137 OPT_INTEGER('d', "delay", &top.delay_secs, 1138 "number of seconds to delay between refreshes"), 1139 OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab, 1140 "dump the symbol table used for profiling"), 1141 OPT_INTEGER('f', "count-filter", &top.count_filter, 1142 "only display functions with more events than this"), 1143 OPT_BOOLEAN('g', "group", &top.group, 1144 "put the counters into a counter group"), 1145 OPT_BOOLEAN('i', "inherit", &top.inherit, 1146 "child tasks inherit counters"), 1147 OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name", 1148 "symbol to annotate"), 1149 OPT_BOOLEAN('z', "zero", &top.zero, 1150 "zero history across updates"), 1151 OPT_INTEGER('F', "freq", &top.freq, 1152 "profile at this frequency"), 1153 OPT_INTEGER('E', "entries", &top.print_entries, 1154 "display this many functions"), 1155 OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols, 1156 "hide user symbols"), 1157 OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"), 1158 OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"), 1159 OPT_INCR('v', "verbose", &verbose, 1160 "be more verbose (show counter open errors, etc)"), 1161 OPT_STRING('s', "sort", &sort_order, "key[,key2...]", 1162 "sort by key(s): pid, comm, dso, symbol, parent"), 1163 OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples, 1164 "Show a column with the number of samples"), 1165 OPT_CALLBACK_DEFAULT('G', "call-graph", &top, "output_type,min_percent, call_order", 1166 "Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. " 1167 "Default: fractal,0.5,callee", &parse_callchain_opt, 1168 callchain_default_opt), 1169 OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period, 1170 "Show a column with the sum of periods"), 1171 OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]", 1172 "only consider symbols in these dsos"), 1173 OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]", 1174 "only consider symbols in these comms"), 1175 OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]", 1176 "only consider these symbols"), 1177 OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src, 1178 "Interleave source code with assembly code (default)"), 1179 OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw, 1180 "Display raw encoding of assembly instructions (default)"), 1181 OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style", 1182 "Specify disassembler style (e.g. -M intel for intel syntax)"), 1183 OPT_END() 1184 }; 1185 1186 top.evlist = perf_evlist__new(NULL, NULL); 1187 if (top.evlist == NULL) 1188 return -ENOMEM; 1189 1190 symbol_conf.exclude_other = false; 1191 1192 argc = parse_options(argc, argv, options, top_usage, 0); 1193 if (argc) 1194 usage_with_options(top_usage, options); 1195 1196 if (sort_order == default_sort_order) 1197 sort_order = "dso,symbol"; 1198 1199 setup_sorting(top_usage, options); 1200 1201 if (top.use_stdio) 1202 use_browser = 0; 1203 else if (top.use_tui) 1204 use_browser = 1; 1205 1206 setup_browser(false); 1207 1208 /* CPU and PID are mutually exclusive */ 1209 if (top.target_tid > 0 && top.cpu_list) { 1210 printf("WARNING: PID switch overriding CPU\n"); 1211 sleep(1); 1212 top.cpu_list = NULL; 1213 } 1214 1215 if (top.target_pid != -1) 1216 top.target_tid = top.target_pid; 1217 1218 if (perf_evlist__create_maps(top.evlist, top.target_pid, 1219 top.target_tid, top.cpu_list) < 0) 1220 usage_with_options(top_usage, options); 1221 1222 if (!top.evlist->nr_entries && 1223 perf_evlist__add_default(top.evlist) < 0) { 1224 pr_err("Not enough memory for event selector list\n"); 1225 return -ENOMEM; 1226 } 1227 1228 symbol_conf.nr_events = top.evlist->nr_entries; 1229 1230 if (top.delay_secs < 1) 1231 top.delay_secs = 1; 1232 1233 /* 1234 * User specified count overrides default frequency. 1235 */ 1236 if (top.default_interval) 1237 top.freq = 0; 1238 else if (top.freq) { 1239 top.default_interval = top.freq; 1240 } else { 1241 fprintf(stderr, "frequency and count are zero, aborting\n"); 1242 exit(EXIT_FAILURE); 1243 } 1244 1245 list_for_each_entry(pos, &top.evlist->entries, node) { 1246 /* 1247 * Fill in the ones not specifically initialized via -c: 1248 */ 1249 if (!pos->attr.sample_period) 1250 pos->attr.sample_period = top.default_interval; 1251 } 1252 1253 top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node); 1254 1255 symbol_conf.priv_size = sizeof(struct annotation); 1256 1257 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL); 1258 if (symbol__init() < 0) 1259 return -1; 1260 1261 sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout); 1262 sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout); 1263 sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout); 1264 1265 /* 1266 * Avoid annotation data structures overhead when symbols aren't on the 1267 * sort list. 1268 */ 1269 top.sort_has_symbols = sort_sym.list.next != NULL; 1270 1271 get_term_dimensions(&top.winsize); 1272 if (top.print_entries == 0) { 1273 struct sigaction act = { 1274 .sa_sigaction = perf_top__sig_winch, 1275 .sa_flags = SA_SIGINFO, 1276 }; 1277 perf_top__update_print_entries(&top); 1278 sigaction(SIGWINCH, &act, NULL); 1279 } 1280 1281 status = __cmd_top(&top); 1282 1283 perf_evlist__delete(top.evlist); 1284 1285 return status; 1286 } 1287