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 * 9 * Improvements and fixes by: 10 * 11 * Arjan van de Ven <arjan@linux.intel.com> 12 * Yanmin Zhang <yanmin.zhang@intel.com> 13 * Wu Fengguang <fengguang.wu@intel.com> 14 * Mike Galbraith <efault@gmx.de> 15 * Paul Mackerras <paulus@samba.org> 16 * 17 * Released under the GPL v2. (and only v2, not any later version) 18 */ 19 #include "builtin.h" 20 21 #include "perf.h" 22 23 #include "util/symbol.h" 24 #include "util/color.h" 25 #include "util/thread.h" 26 #include "util/util.h" 27 #include <linux/rbtree.h> 28 #include "util/parse-options.h" 29 #include "util/parse-events.h" 30 31 #include "util/debug.h" 32 33 #include <assert.h> 34 #include <fcntl.h> 35 36 #include <stdio.h> 37 #include <termios.h> 38 #include <unistd.h> 39 40 #include <errno.h> 41 #include <time.h> 42 #include <sched.h> 43 #include <pthread.h> 44 45 #include <sys/syscall.h> 46 #include <sys/ioctl.h> 47 #include <sys/poll.h> 48 #include <sys/prctl.h> 49 #include <sys/wait.h> 50 #include <sys/uio.h> 51 #include <sys/mman.h> 52 53 #include <linux/unistd.h> 54 #include <linux/types.h> 55 56 static int fd[MAX_NR_CPUS][MAX_COUNTERS]; 57 58 static int system_wide = 0; 59 60 static int default_interval = 0; 61 62 static int count_filter = 5; 63 static int print_entries; 64 65 static int target_pid = -1; 66 static int inherit = 0; 67 static int profile_cpu = -1; 68 static int nr_cpus = 0; 69 static unsigned int realtime_prio = 0; 70 static int group = 0; 71 static unsigned int page_size; 72 static unsigned int mmap_pages = 16; 73 static int freq = 1000; /* 1 KHz */ 74 75 static int delay_secs = 2; 76 static int zero = 0; 77 static int dump_symtab = 0; 78 79 static bool hide_kernel_symbols = false; 80 static bool hide_user_symbols = false; 81 static struct winsize winsize; 82 struct symbol_conf symbol_conf; 83 84 /* 85 * Source 86 */ 87 88 struct source_line { 89 u64 eip; 90 unsigned long count[MAX_COUNTERS]; 91 char *line; 92 struct source_line *next; 93 }; 94 95 static char *sym_filter = NULL; 96 struct sym_entry *sym_filter_entry = NULL; 97 static int sym_pcnt_filter = 5; 98 static int sym_counter = 0; 99 static int display_weighted = -1; 100 101 /* 102 * Symbols 103 */ 104 105 struct sym_entry_source { 106 struct source_line *source; 107 struct source_line *lines; 108 struct source_line **lines_tail; 109 pthread_mutex_t lock; 110 }; 111 112 struct sym_entry { 113 struct rb_node rb_node; 114 struct list_head node; 115 unsigned long snap_count; 116 double weight; 117 int skip; 118 u16 name_len; 119 u8 origin; 120 struct map *map; 121 struct sym_entry_source *src; 122 unsigned long count[0]; 123 }; 124 125 /* 126 * Source functions 127 */ 128 129 static inline struct symbol *sym_entry__symbol(struct sym_entry *self) 130 { 131 return ((void *)self) + symbol_conf.priv_size; 132 } 133 134 static void get_term_dimensions(struct winsize *ws) 135 { 136 char *s = getenv("LINES"); 137 138 if (s != NULL) { 139 ws->ws_row = atoi(s); 140 s = getenv("COLUMNS"); 141 if (s != NULL) { 142 ws->ws_col = atoi(s); 143 if (ws->ws_row && ws->ws_col) 144 return; 145 } 146 } 147 #ifdef TIOCGWINSZ 148 if (ioctl(1, TIOCGWINSZ, ws) == 0 && 149 ws->ws_row && ws->ws_col) 150 return; 151 #endif 152 ws->ws_row = 25; 153 ws->ws_col = 80; 154 } 155 156 static void update_print_entries(struct winsize *ws) 157 { 158 print_entries = ws->ws_row; 159 160 if (print_entries > 9) 161 print_entries -= 9; 162 } 163 164 static void sig_winch_handler(int sig __used) 165 { 166 get_term_dimensions(&winsize); 167 update_print_entries(&winsize); 168 } 169 170 static void parse_source(struct sym_entry *syme) 171 { 172 struct symbol *sym; 173 struct sym_entry_source *source; 174 struct map *map; 175 FILE *file; 176 char command[PATH_MAX*2]; 177 const char *path; 178 u64 len; 179 180 if (!syme) 181 return; 182 183 if (syme->src == NULL) { 184 syme->src = zalloc(sizeof(*source)); 185 if (syme->src == NULL) 186 return; 187 pthread_mutex_init(&syme->src->lock, NULL); 188 } 189 190 source = syme->src; 191 192 if (source->lines) { 193 pthread_mutex_lock(&source->lock); 194 goto out_assign; 195 } 196 197 sym = sym_entry__symbol(syme); 198 map = syme->map; 199 path = map->dso->long_name; 200 201 len = sym->end - sym->start; 202 203 sprintf(command, 204 "objdump --start-address=0x%016Lx " 205 "--stop-address=0x%016Lx -dS %s", 206 map->unmap_ip(map, sym->start), 207 map->unmap_ip(map, sym->end), path); 208 209 file = popen(command, "r"); 210 if (!file) 211 return; 212 213 pthread_mutex_lock(&source->lock); 214 source->lines_tail = &source->lines; 215 while (!feof(file)) { 216 struct source_line *src; 217 size_t dummy = 0; 218 char *c; 219 220 src = malloc(sizeof(struct source_line)); 221 assert(src != NULL); 222 memset(src, 0, sizeof(struct source_line)); 223 224 if (getline(&src->line, &dummy, file) < 0) 225 break; 226 if (!src->line) 227 break; 228 229 c = strchr(src->line, '\n'); 230 if (c) 231 *c = 0; 232 233 src->next = NULL; 234 *source->lines_tail = src; 235 source->lines_tail = &src->next; 236 237 if (strlen(src->line)>8 && src->line[8] == ':') { 238 src->eip = strtoull(src->line, NULL, 16); 239 src->eip = map->unmap_ip(map, src->eip); 240 } 241 if (strlen(src->line)>8 && src->line[16] == ':') { 242 src->eip = strtoull(src->line, NULL, 16); 243 src->eip = map->unmap_ip(map, src->eip); 244 } 245 } 246 pclose(file); 247 out_assign: 248 sym_filter_entry = syme; 249 pthread_mutex_unlock(&source->lock); 250 } 251 252 static void __zero_source_counters(struct sym_entry *syme) 253 { 254 int i; 255 struct source_line *line; 256 257 line = syme->src->lines; 258 while (line) { 259 for (i = 0; i < nr_counters; i++) 260 line->count[i] = 0; 261 line = line->next; 262 } 263 } 264 265 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip) 266 { 267 struct source_line *line; 268 269 if (syme != sym_filter_entry) 270 return; 271 272 if (pthread_mutex_trylock(&syme->src->lock)) 273 return; 274 275 if (syme->src == NULL || syme->src->source == NULL) 276 goto out_unlock; 277 278 for (line = syme->src->lines; line; line = line->next) { 279 if (line->eip == ip) { 280 line->count[counter]++; 281 break; 282 } 283 if (line->eip > ip) 284 break; 285 } 286 out_unlock: 287 pthread_mutex_unlock(&syme->src->lock); 288 } 289 290 static void lookup_sym_source(struct sym_entry *syme) 291 { 292 struct symbol *symbol = sym_entry__symbol(syme); 293 struct source_line *line; 294 char pattern[PATH_MAX]; 295 296 sprintf(pattern, "<%s>:", symbol->name); 297 298 pthread_mutex_lock(&syme->src->lock); 299 for (line = syme->src->lines; line; line = line->next) { 300 if (strstr(line->line, pattern)) { 301 syme->src->source = line; 302 break; 303 } 304 } 305 pthread_mutex_unlock(&syme->src->lock); 306 } 307 308 static void show_lines(struct source_line *queue, int count, int total) 309 { 310 int i; 311 struct source_line *line; 312 313 line = queue; 314 for (i = 0; i < count; i++) { 315 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total; 316 317 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line); 318 line = line->next; 319 } 320 } 321 322 #define TRACE_COUNT 3 323 324 static void show_details(struct sym_entry *syme) 325 { 326 struct symbol *symbol; 327 struct source_line *line; 328 struct source_line *line_queue = NULL; 329 int displayed = 0; 330 int line_queue_count = 0, total = 0, more = 0; 331 332 if (!syme) 333 return; 334 335 if (!syme->src->source) 336 lookup_sym_source(syme); 337 338 if (!syme->src->source) 339 return; 340 341 symbol = sym_entry__symbol(syme); 342 printf("Showing %s for %s\n", event_name(sym_counter), symbol->name); 343 printf(" Events Pcnt (>=%d%%)\n", sym_pcnt_filter); 344 345 pthread_mutex_lock(&syme->src->lock); 346 line = syme->src->source; 347 while (line) { 348 total += line->count[sym_counter]; 349 line = line->next; 350 } 351 352 line = syme->src->source; 353 while (line) { 354 float pcnt = 0.0; 355 356 if (!line_queue_count) 357 line_queue = line; 358 line_queue_count++; 359 360 if (line->count[sym_counter]) 361 pcnt = 100.0 * line->count[sym_counter] / (float)total; 362 if (pcnt >= (float)sym_pcnt_filter) { 363 if (displayed <= print_entries) 364 show_lines(line_queue, line_queue_count, total); 365 else more++; 366 displayed += line_queue_count; 367 line_queue_count = 0; 368 line_queue = NULL; 369 } else if (line_queue_count > TRACE_COUNT) { 370 line_queue = line_queue->next; 371 line_queue_count--; 372 } 373 374 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8; 375 line = line->next; 376 } 377 pthread_mutex_unlock(&syme->src->lock); 378 if (more) 379 printf("%d lines not displayed, maybe increase display entries [e]\n", more); 380 } 381 382 /* 383 * Symbols will be added here in event__process_sample and will get out 384 * after decayed. 385 */ 386 static LIST_HEAD(active_symbols); 387 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER; 388 389 /* 390 * Ordering weight: count-1 * count-2 * ... / count-n 391 */ 392 static double sym_weight(const struct sym_entry *sym) 393 { 394 double weight = sym->snap_count; 395 int counter; 396 397 if (!display_weighted) 398 return weight; 399 400 for (counter = 1; counter < nr_counters-1; counter++) 401 weight *= sym->count[counter]; 402 403 weight /= (sym->count[counter] + 1); 404 405 return weight; 406 } 407 408 static long samples; 409 static long userspace_samples; 410 static const char CONSOLE_CLEAR[] = "[H[2J"; 411 412 static void __list_insert_active_sym(struct sym_entry *syme) 413 { 414 list_add(&syme->node, &active_symbols); 415 } 416 417 static void list_remove_active_sym(struct sym_entry *syme) 418 { 419 pthread_mutex_lock(&active_symbols_lock); 420 list_del_init(&syme->node); 421 pthread_mutex_unlock(&active_symbols_lock); 422 } 423 424 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se) 425 { 426 struct rb_node **p = &tree->rb_node; 427 struct rb_node *parent = NULL; 428 struct sym_entry *iter; 429 430 while (*p != NULL) { 431 parent = *p; 432 iter = rb_entry(parent, struct sym_entry, rb_node); 433 434 if (se->weight > iter->weight) 435 p = &(*p)->rb_left; 436 else 437 p = &(*p)->rb_right; 438 } 439 440 rb_link_node(&se->rb_node, parent, p); 441 rb_insert_color(&se->rb_node, tree); 442 } 443 444 static void print_sym_table(void) 445 { 446 int printed = 0, j; 447 int counter, snap = !display_weighted ? sym_counter : 0; 448 float samples_per_sec = samples/delay_secs; 449 float ksamples_per_sec = (samples-userspace_samples)/delay_secs; 450 float sum_ksamples = 0.0; 451 struct sym_entry *syme, *n; 452 struct rb_root tmp = RB_ROOT; 453 struct rb_node *nd; 454 int sym_width = 0, dso_width = 0, max_dso_width; 455 const int win_width = winsize.ws_col - 1; 456 457 samples = userspace_samples = 0; 458 459 /* Sort the active symbols */ 460 pthread_mutex_lock(&active_symbols_lock); 461 syme = list_entry(active_symbols.next, struct sym_entry, node); 462 pthread_mutex_unlock(&active_symbols_lock); 463 464 list_for_each_entry_safe_from(syme, n, &active_symbols, node) { 465 syme->snap_count = syme->count[snap]; 466 if (syme->snap_count != 0) { 467 468 if ((hide_user_symbols && 469 syme->origin == PERF_RECORD_MISC_USER) || 470 (hide_kernel_symbols && 471 syme->origin == PERF_RECORD_MISC_KERNEL)) { 472 list_remove_active_sym(syme); 473 continue; 474 } 475 syme->weight = sym_weight(syme); 476 rb_insert_active_sym(&tmp, syme); 477 sum_ksamples += syme->snap_count; 478 479 for (j = 0; j < nr_counters; j++) 480 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8; 481 } else 482 list_remove_active_sym(syme); 483 } 484 485 puts(CONSOLE_CLEAR); 486 487 printf("%-*.*s\n", win_width, win_width, graph_dotted_line); 488 printf( " PerfTop:%8.0f irqs/sec kernel:%4.1f%% [", 489 samples_per_sec, 490 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec))); 491 492 if (nr_counters == 1 || !display_weighted) { 493 printf("%Ld", (u64)attrs[0].sample_period); 494 if (freq) 495 printf("Hz "); 496 else 497 printf(" "); 498 } 499 500 if (!display_weighted) 501 printf("%s", event_name(sym_counter)); 502 else for (counter = 0; counter < nr_counters; counter++) { 503 if (counter) 504 printf("/"); 505 506 printf("%s", event_name(counter)); 507 } 508 509 printf( "], "); 510 511 if (target_pid != -1) 512 printf(" (target_pid: %d", target_pid); 513 else 514 printf(" (all"); 515 516 if (profile_cpu != -1) 517 printf(", cpu: %d)\n", profile_cpu); 518 else { 519 if (target_pid != -1) 520 printf(")\n"); 521 else 522 printf(", %d CPUs)\n", nr_cpus); 523 } 524 525 printf("%-*.*s\n", win_width, win_width, graph_dotted_line); 526 527 if (sym_filter_entry) { 528 show_details(sym_filter_entry); 529 return; 530 } 531 532 /* 533 * Find the longest symbol name that will be displayed 534 */ 535 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) { 536 syme = rb_entry(nd, struct sym_entry, rb_node); 537 if (++printed > print_entries || 538 (int)syme->snap_count < count_filter) 539 continue; 540 541 if (syme->map->dso->long_name_len > dso_width) 542 dso_width = syme->map->dso->long_name_len; 543 544 if (syme->name_len > sym_width) 545 sym_width = syme->name_len; 546 } 547 548 printed = 0; 549 550 max_dso_width = winsize.ws_col - sym_width - 29; 551 if (dso_width > max_dso_width) 552 dso_width = max_dso_width; 553 putchar('\n'); 554 if (nr_counters == 1) 555 printf(" samples pcnt"); 556 else 557 printf(" weight samples pcnt"); 558 559 if (verbose) 560 printf(" RIP "); 561 printf(" %-*.*s DSO\n", sym_width, sym_width, "function"); 562 printf(" %s _______ _____", 563 nr_counters == 1 ? " " : "______"); 564 if (verbose) 565 printf(" ________________"); 566 printf(" %-*.*s", sym_width, sym_width, graph_line); 567 printf(" %-*.*s", dso_width, dso_width, graph_line); 568 puts("\n"); 569 570 for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) { 571 struct symbol *sym; 572 double pcnt; 573 574 syme = rb_entry(nd, struct sym_entry, rb_node); 575 sym = sym_entry__symbol(syme); 576 577 if (++printed > print_entries || (int)syme->snap_count < count_filter) 578 continue; 579 580 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) / 581 sum_ksamples)); 582 583 if (nr_counters == 1 || !display_weighted) 584 printf("%20.2f ", syme->weight); 585 else 586 printf("%9.1f %10ld ", syme->weight, syme->snap_count); 587 588 percent_color_fprintf(stdout, "%4.1f%%", pcnt); 589 if (verbose) 590 printf(" %016llx", sym->start); 591 printf(" %-*.*s", sym_width, sym_width, sym->name); 592 printf(" %-*.*s\n", dso_width, dso_width, 593 dso_width >= syme->map->dso->long_name_len ? 594 syme->map->dso->long_name : 595 syme->map->dso->short_name); 596 } 597 } 598 599 static void prompt_integer(int *target, const char *msg) 600 { 601 char *buf = malloc(0), *p; 602 size_t dummy = 0; 603 int tmp; 604 605 fprintf(stdout, "\n%s: ", msg); 606 if (getline(&buf, &dummy, stdin) < 0) 607 return; 608 609 p = strchr(buf, '\n'); 610 if (p) 611 *p = 0; 612 613 p = buf; 614 while(*p) { 615 if (!isdigit(*p)) 616 goto out_free; 617 p++; 618 } 619 tmp = strtoul(buf, NULL, 10); 620 *target = tmp; 621 out_free: 622 free(buf); 623 } 624 625 static void prompt_percent(int *target, const char *msg) 626 { 627 int tmp = 0; 628 629 prompt_integer(&tmp, msg); 630 if (tmp >= 0 && tmp <= 100) 631 *target = tmp; 632 } 633 634 static void prompt_symbol(struct sym_entry **target, const char *msg) 635 { 636 char *buf = malloc(0), *p; 637 struct sym_entry *syme = *target, *n, *found = NULL; 638 size_t dummy = 0; 639 640 /* zero counters of active symbol */ 641 if (syme) { 642 pthread_mutex_lock(&syme->src->lock); 643 __zero_source_counters(syme); 644 *target = NULL; 645 pthread_mutex_unlock(&syme->src->lock); 646 } 647 648 fprintf(stdout, "\n%s: ", msg); 649 if (getline(&buf, &dummy, stdin) < 0) 650 goto out_free; 651 652 p = strchr(buf, '\n'); 653 if (p) 654 *p = 0; 655 656 pthread_mutex_lock(&active_symbols_lock); 657 syme = list_entry(active_symbols.next, struct sym_entry, node); 658 pthread_mutex_unlock(&active_symbols_lock); 659 660 list_for_each_entry_safe_from(syme, n, &active_symbols, node) { 661 struct symbol *sym = sym_entry__symbol(syme); 662 663 if (!strcmp(buf, sym->name)) { 664 found = syme; 665 break; 666 } 667 } 668 669 if (!found) { 670 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter); 671 sleep(1); 672 return; 673 } else 674 parse_source(found); 675 676 out_free: 677 free(buf); 678 } 679 680 static void print_mapped_keys(void) 681 { 682 char *name = NULL; 683 684 if (sym_filter_entry) { 685 struct symbol *sym = sym_entry__symbol(sym_filter_entry); 686 name = sym->name; 687 } 688 689 fprintf(stdout, "\nMapped keys:\n"); 690 fprintf(stdout, "\t[d] display refresh delay. \t(%d)\n", delay_secs); 691 fprintf(stdout, "\t[e] display entries (lines). \t(%d)\n", print_entries); 692 693 if (nr_counters > 1) 694 fprintf(stdout, "\t[E] active event counter. \t(%s)\n", event_name(sym_counter)); 695 696 fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter); 697 698 if (symbol_conf.vmlinux_name) { 699 fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter); 700 fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL"); 701 fprintf(stdout, "\t[S] stop annotation.\n"); 702 } 703 704 if (nr_counters > 1) 705 fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0); 706 707 fprintf(stdout, 708 "\t[K] hide kernel_symbols symbols. \t(%s)\n", 709 hide_kernel_symbols ? "yes" : "no"); 710 fprintf(stdout, 711 "\t[U] hide user symbols. \t(%s)\n", 712 hide_user_symbols ? "yes" : "no"); 713 fprintf(stdout, "\t[z] toggle sample zeroing. \t(%d)\n", zero ? 1 : 0); 714 fprintf(stdout, "\t[qQ] quit.\n"); 715 } 716 717 static int key_mapped(int c) 718 { 719 switch (c) { 720 case 'd': 721 case 'e': 722 case 'f': 723 case 'z': 724 case 'q': 725 case 'Q': 726 case 'K': 727 case 'U': 728 return 1; 729 case 'E': 730 case 'w': 731 return nr_counters > 1 ? 1 : 0; 732 case 'F': 733 case 's': 734 case 'S': 735 return symbol_conf.vmlinux_name ? 1 : 0; 736 default: 737 break; 738 } 739 740 return 0; 741 } 742 743 static void handle_keypress(int c) 744 { 745 if (!key_mapped(c)) { 746 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN }; 747 struct termios tc, save; 748 749 print_mapped_keys(); 750 fprintf(stdout, "\nEnter selection, or unmapped key to continue: "); 751 fflush(stdout); 752 753 tcgetattr(0, &save); 754 tc = save; 755 tc.c_lflag &= ~(ICANON | ECHO); 756 tc.c_cc[VMIN] = 0; 757 tc.c_cc[VTIME] = 0; 758 tcsetattr(0, TCSANOW, &tc); 759 760 poll(&stdin_poll, 1, -1); 761 c = getc(stdin); 762 763 tcsetattr(0, TCSAFLUSH, &save); 764 if (!key_mapped(c)) 765 return; 766 } 767 768 switch (c) { 769 case 'd': 770 prompt_integer(&delay_secs, "Enter display delay"); 771 if (delay_secs < 1) 772 delay_secs = 1; 773 break; 774 case 'e': 775 prompt_integer(&print_entries, "Enter display entries (lines)"); 776 if (print_entries == 0) { 777 sig_winch_handler(SIGWINCH); 778 signal(SIGWINCH, sig_winch_handler); 779 } else 780 signal(SIGWINCH, SIG_DFL); 781 break; 782 case 'E': 783 if (nr_counters > 1) { 784 int i; 785 786 fprintf(stderr, "\nAvailable events:"); 787 for (i = 0; i < nr_counters; i++) 788 fprintf(stderr, "\n\t%d %s", i, event_name(i)); 789 790 prompt_integer(&sym_counter, "Enter details event counter"); 791 792 if (sym_counter >= nr_counters) { 793 fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0)); 794 sym_counter = 0; 795 sleep(1); 796 } 797 } else sym_counter = 0; 798 break; 799 case 'f': 800 prompt_integer(&count_filter, "Enter display event count filter"); 801 break; 802 case 'F': 803 prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)"); 804 break; 805 case 'K': 806 hide_kernel_symbols = !hide_kernel_symbols; 807 break; 808 case 'q': 809 case 'Q': 810 printf("exiting.\n"); 811 if (dump_symtab) 812 dsos__fprintf(stderr); 813 exit(0); 814 case 's': 815 prompt_symbol(&sym_filter_entry, "Enter details symbol"); 816 break; 817 case 'S': 818 if (!sym_filter_entry) 819 break; 820 else { 821 struct sym_entry *syme = sym_filter_entry; 822 823 pthread_mutex_lock(&syme->src->lock); 824 sym_filter_entry = NULL; 825 __zero_source_counters(syme); 826 pthread_mutex_unlock(&syme->src->lock); 827 } 828 break; 829 case 'U': 830 hide_user_symbols = !hide_user_symbols; 831 break; 832 case 'w': 833 display_weighted = ~display_weighted; 834 break; 835 case 'z': 836 zero = ~zero; 837 break; 838 default: 839 break; 840 } 841 } 842 843 static void *display_thread(void *arg __used) 844 { 845 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN }; 846 struct termios tc, save; 847 int delay_msecs, c; 848 849 tcgetattr(0, &save); 850 tc = save; 851 tc.c_lflag &= ~(ICANON | ECHO); 852 tc.c_cc[VMIN] = 0; 853 tc.c_cc[VTIME] = 0; 854 855 repeat: 856 delay_msecs = delay_secs * 1000; 857 tcsetattr(0, TCSANOW, &tc); 858 /* trash return*/ 859 getc(stdin); 860 861 do { 862 print_sym_table(); 863 } while (!poll(&stdin_poll, 1, delay_msecs) == 1); 864 865 c = getc(stdin); 866 tcsetattr(0, TCSAFLUSH, &save); 867 868 handle_keypress(c); 869 goto repeat; 870 871 return NULL; 872 } 873 874 /* Tag samples to be skipped. */ 875 static const char *skip_symbols[] = { 876 "default_idle", 877 "cpu_idle", 878 "enter_idle", 879 "exit_idle", 880 "mwait_idle", 881 "mwait_idle_with_hints", 882 "poll_idle", 883 "ppc64_runlatch_off", 884 "pseries_dedicated_idle_sleep", 885 NULL 886 }; 887 888 static int symbol_filter(struct map *map, struct symbol *sym) 889 { 890 struct sym_entry *syme; 891 const char *name = sym->name; 892 int i; 893 894 /* 895 * ppc64 uses function descriptors and appends a '.' to the 896 * start of every instruction address. Remove it. 897 */ 898 if (name[0] == '.') 899 name++; 900 901 if (!strcmp(name, "_text") || 902 !strcmp(name, "_etext") || 903 !strcmp(name, "_sinittext") || 904 !strncmp("init_module", name, 11) || 905 !strncmp("cleanup_module", name, 14) || 906 strstr(name, "_text_start") || 907 strstr(name, "_text_end")) 908 return 1; 909 910 syme = symbol__priv(sym); 911 syme->map = map; 912 syme->src = NULL; 913 if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) 914 sym_filter_entry = syme; 915 916 for (i = 0; skip_symbols[i]; i++) { 917 if (!strcmp(skip_symbols[i], name)) { 918 syme->skip = 1; 919 break; 920 } 921 } 922 923 if (!syme->skip) 924 syme->name_len = strlen(sym->name); 925 926 return 0; 927 } 928 929 static void event__process_sample(const event_t *self, int counter) 930 { 931 u64 ip = self->ip.ip; 932 struct sym_entry *syme; 933 struct addr_location al; 934 u8 origin = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 935 936 switch (origin) { 937 case PERF_RECORD_MISC_USER: 938 if (hide_user_symbols) 939 return; 940 break; 941 case PERF_RECORD_MISC_KERNEL: 942 if (hide_kernel_symbols) 943 return; 944 break; 945 default: 946 return; 947 } 948 949 if (event__preprocess_sample(self, &al, symbol_filter) < 0 || 950 al.sym == NULL) 951 return; 952 953 syme = symbol__priv(al.sym); 954 if (!syme->skip) { 955 syme->count[counter]++; 956 syme->origin = origin; 957 record_precise_ip(syme, counter, ip); 958 pthread_mutex_lock(&active_symbols_lock); 959 if (list_empty(&syme->node) || !syme->node.next) 960 __list_insert_active_sym(syme); 961 pthread_mutex_unlock(&active_symbols_lock); 962 if (origin == PERF_RECORD_MISC_USER) 963 ++userspace_samples; 964 ++samples; 965 } 966 } 967 968 static int event__process(event_t *event) 969 { 970 switch (event->header.type) { 971 case PERF_RECORD_COMM: 972 event__process_comm(event); 973 break; 974 case PERF_RECORD_MMAP: 975 event__process_mmap(event); 976 break; 977 default: 978 break; 979 } 980 981 return 0; 982 } 983 984 struct mmap_data { 985 int counter; 986 void *base; 987 int mask; 988 unsigned int prev; 989 }; 990 991 static unsigned int mmap_read_head(struct mmap_data *md) 992 { 993 struct perf_event_mmap_page *pc = md->base; 994 int head; 995 996 head = pc->data_head; 997 rmb(); 998 999 return head; 1000 } 1001 1002 static void mmap_read_counter(struct mmap_data *md) 1003 { 1004 unsigned int head = mmap_read_head(md); 1005 unsigned int old = md->prev; 1006 unsigned char *data = md->base + page_size; 1007 int diff; 1008 1009 /* 1010 * If we're further behind than half the buffer, there's a chance 1011 * the writer will bite our tail and mess up the samples under us. 1012 * 1013 * If we somehow ended up ahead of the head, we got messed up. 1014 * 1015 * In either case, truncate and restart at head. 1016 */ 1017 diff = head - old; 1018 if (diff > md->mask / 2 || diff < 0) { 1019 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n"); 1020 1021 /* 1022 * head points to a known good entry, start there. 1023 */ 1024 old = head; 1025 } 1026 1027 for (; old != head;) { 1028 event_t *event = (event_t *)&data[old & md->mask]; 1029 1030 event_t event_copy; 1031 1032 size_t size = event->header.size; 1033 1034 /* 1035 * Event straddles the mmap boundary -- header should always 1036 * be inside due to u64 alignment of output. 1037 */ 1038 if ((old & md->mask) + size != ((old + size) & md->mask)) { 1039 unsigned int offset = old; 1040 unsigned int len = min(sizeof(*event), size), cpy; 1041 void *dst = &event_copy; 1042 1043 do { 1044 cpy = min(md->mask + 1 - (offset & md->mask), len); 1045 memcpy(dst, &data[offset & md->mask], cpy); 1046 offset += cpy; 1047 dst += cpy; 1048 len -= cpy; 1049 } while (len); 1050 1051 event = &event_copy; 1052 } 1053 1054 if (event->header.type == PERF_RECORD_SAMPLE) 1055 event__process_sample(event, md->counter); 1056 else 1057 event__process(event); 1058 old += size; 1059 } 1060 1061 md->prev = old; 1062 } 1063 1064 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS]; 1065 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS]; 1066 1067 static void mmap_read(void) 1068 { 1069 int i, counter; 1070 1071 for (i = 0; i < nr_cpus; i++) { 1072 for (counter = 0; counter < nr_counters; counter++) 1073 mmap_read_counter(&mmap_array[i][counter]); 1074 } 1075 } 1076 1077 int nr_poll; 1078 int group_fd; 1079 1080 static void start_counter(int i, int counter) 1081 { 1082 struct perf_event_attr *attr; 1083 int cpu; 1084 1085 cpu = profile_cpu; 1086 if (target_pid == -1 && profile_cpu == -1) 1087 cpu = i; 1088 1089 attr = attrs + counter; 1090 1091 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; 1092 1093 if (freq) { 1094 attr->sample_type |= PERF_SAMPLE_PERIOD; 1095 attr->freq = 1; 1096 attr->sample_freq = freq; 1097 } 1098 1099 attr->inherit = (cpu < 0) && inherit; 1100 attr->mmap = 1; 1101 1102 try_again: 1103 fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0); 1104 1105 if (fd[i][counter] < 0) { 1106 int err = errno; 1107 1108 if (err == EPERM || err == EACCES) 1109 die("No permission - are you root?\n"); 1110 /* 1111 * If it's cycles then fall back to hrtimer 1112 * based cpu-clock-tick sw counter, which 1113 * is always available even if no PMU support: 1114 */ 1115 if (attr->type == PERF_TYPE_HARDWARE 1116 && attr->config == PERF_COUNT_HW_CPU_CYCLES) { 1117 1118 if (verbose) 1119 warning(" ... trying to fall back to cpu-clock-ticks\n"); 1120 1121 attr->type = PERF_TYPE_SOFTWARE; 1122 attr->config = PERF_COUNT_SW_CPU_CLOCK; 1123 goto try_again; 1124 } 1125 printf("\n"); 1126 error("perfcounter syscall returned with %d (%s)\n", 1127 fd[i][counter], strerror(err)); 1128 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); 1129 exit(-1); 1130 } 1131 assert(fd[i][counter] >= 0); 1132 fcntl(fd[i][counter], F_SETFL, O_NONBLOCK); 1133 1134 /* 1135 * First counter acts as the group leader: 1136 */ 1137 if (group && group_fd == -1) 1138 group_fd = fd[i][counter]; 1139 1140 event_array[nr_poll].fd = fd[i][counter]; 1141 event_array[nr_poll].events = POLLIN; 1142 nr_poll++; 1143 1144 mmap_array[i][counter].counter = counter; 1145 mmap_array[i][counter].prev = 0; 1146 mmap_array[i][counter].mask = mmap_pages*page_size - 1; 1147 mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size, 1148 PROT_READ, MAP_SHARED, fd[i][counter], 0); 1149 if (mmap_array[i][counter].base == MAP_FAILED) 1150 die("failed to mmap with %d (%s)\n", errno, strerror(errno)); 1151 } 1152 1153 static int __cmd_top(void) 1154 { 1155 pthread_t thread; 1156 int i, counter; 1157 int ret; 1158 1159 if (target_pid != -1) 1160 event__synthesize_thread(target_pid, event__process); 1161 else 1162 event__synthesize_threads(event__process); 1163 1164 for (i = 0; i < nr_cpus; i++) { 1165 group_fd = -1; 1166 for (counter = 0; counter < nr_counters; counter++) 1167 start_counter(i, counter); 1168 } 1169 1170 /* Wait for a minimal set of events before starting the snapshot */ 1171 poll(event_array, nr_poll, 100); 1172 1173 mmap_read(); 1174 1175 if (pthread_create(&thread, NULL, display_thread, NULL)) { 1176 printf("Could not create display thread.\n"); 1177 exit(-1); 1178 } 1179 1180 if (realtime_prio) { 1181 struct sched_param param; 1182 1183 param.sched_priority = realtime_prio; 1184 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { 1185 printf("Could not set realtime priority.\n"); 1186 exit(-1); 1187 } 1188 } 1189 1190 while (1) { 1191 int hits = samples; 1192 1193 mmap_read(); 1194 1195 if (hits == samples) 1196 ret = poll(event_array, nr_poll, 100); 1197 } 1198 1199 return 0; 1200 } 1201 1202 static const char * const top_usage[] = { 1203 "perf top [<options>]", 1204 NULL 1205 }; 1206 1207 static const struct option options[] = { 1208 OPT_CALLBACK('e', "event", NULL, "event", 1209 "event selector. use 'perf list' to list available events", 1210 parse_events), 1211 OPT_INTEGER('c', "count", &default_interval, 1212 "event period to sample"), 1213 OPT_INTEGER('p', "pid", &target_pid, 1214 "profile events on existing pid"), 1215 OPT_BOOLEAN('a', "all-cpus", &system_wide, 1216 "system-wide collection from all CPUs"), 1217 OPT_INTEGER('C', "CPU", &profile_cpu, 1218 "CPU to profile on"), 1219 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, 1220 "file", "vmlinux pathname"), 1221 OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols, 1222 "hide kernel symbols"), 1223 OPT_INTEGER('m', "mmap-pages", &mmap_pages, 1224 "number of mmap data pages"), 1225 OPT_INTEGER('r', "realtime", &realtime_prio, 1226 "collect data with this RT SCHED_FIFO priority"), 1227 OPT_INTEGER('d', "delay", &delay_secs, 1228 "number of seconds to delay between refreshes"), 1229 OPT_BOOLEAN('D', "dump-symtab", &dump_symtab, 1230 "dump the symbol table used for profiling"), 1231 OPT_INTEGER('f', "count-filter", &count_filter, 1232 "only display functions with more events than this"), 1233 OPT_BOOLEAN('g', "group", &group, 1234 "put the counters into a counter group"), 1235 OPT_BOOLEAN('i', "inherit", &inherit, 1236 "child tasks inherit counters"), 1237 OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name", 1238 "symbol to annotate - requires -k option"), 1239 OPT_BOOLEAN('z', "zero", &zero, 1240 "zero history across updates"), 1241 OPT_INTEGER('F', "freq", &freq, 1242 "profile at this frequency"), 1243 OPT_INTEGER('E', "entries", &print_entries, 1244 "display this many functions"), 1245 OPT_BOOLEAN('U', "hide_user_symbols", &hide_user_symbols, 1246 "hide user symbols"), 1247 OPT_BOOLEAN('v', "verbose", &verbose, 1248 "be more verbose (show counter open errors, etc)"), 1249 OPT_END() 1250 }; 1251 1252 int cmd_top(int argc, const char **argv, const char *prefix __used) 1253 { 1254 int counter; 1255 1256 page_size = sysconf(_SC_PAGE_SIZE); 1257 1258 argc = parse_options(argc, argv, options, top_usage, 0); 1259 if (argc) 1260 usage_with_options(top_usage, options); 1261 1262 /* CPU and PID are mutually exclusive */ 1263 if (target_pid != -1 && profile_cpu != -1) { 1264 printf("WARNING: PID switch overriding CPU\n"); 1265 sleep(1); 1266 profile_cpu = -1; 1267 } 1268 1269 if (!nr_counters) 1270 nr_counters = 1; 1271 1272 symbol_conf.priv_size = (sizeof(struct sym_entry) + 1273 (nr_counters + 1) * sizeof(unsigned long)); 1274 if (symbol_conf.vmlinux_name == NULL) 1275 symbol_conf.try_vmlinux_path = true; 1276 if (symbol__init(&symbol_conf) < 0) 1277 return -1; 1278 1279 if (delay_secs < 1) 1280 delay_secs = 1; 1281 1282 parse_source(sym_filter_entry); 1283 1284 /* 1285 * User specified count overrides default frequency. 1286 */ 1287 if (default_interval) 1288 freq = 0; 1289 else if (freq) { 1290 default_interval = freq; 1291 } else { 1292 fprintf(stderr, "frequency and count are zero, aborting\n"); 1293 exit(EXIT_FAILURE); 1294 } 1295 1296 /* 1297 * Fill in the ones not specifically initialized via -c: 1298 */ 1299 for (counter = 0; counter < nr_counters; counter++) { 1300 if (attrs[counter].sample_period) 1301 continue; 1302 1303 attrs[counter].sample_period = default_interval; 1304 } 1305 1306 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); 1307 assert(nr_cpus <= MAX_NR_CPUS); 1308 assert(nr_cpus >= 0); 1309 1310 if (target_pid != -1 || profile_cpu != -1) 1311 nr_cpus = 1; 1312 1313 get_term_dimensions(&winsize); 1314 if (print_entries == 0) { 1315 update_print_entries(&winsize); 1316 signal(SIGWINCH, sig_winch_handler); 1317 } 1318 1319 return __cmd_top(); 1320 } 1321