1 #include <stdio.h> 2 3 #include "../../util/util.h" 4 #include "../../util/hist.h" 5 #include "../../util/sort.h" 6 #include "../../util/evsel.h" 7 8 9 static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin) 10 { 11 int i; 12 int ret = fprintf(fp, " "); 13 14 for (i = 0; i < left_margin; i++) 15 ret += fprintf(fp, " "); 16 17 return ret; 18 } 19 20 static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask, 21 int left_margin) 22 { 23 int i; 24 size_t ret = callchain__fprintf_left_margin(fp, left_margin); 25 26 for (i = 0; i < depth; i++) 27 if (depth_mask & (1 << i)) 28 ret += fprintf(fp, "| "); 29 else 30 ret += fprintf(fp, " "); 31 32 ret += fprintf(fp, "\n"); 33 34 return ret; 35 } 36 37 static size_t ipchain__fprintf_graph(FILE *fp, struct callchain_node *node, 38 struct callchain_list *chain, 39 int depth, int depth_mask, int period, 40 u64 total_samples, int left_margin) 41 { 42 int i; 43 size_t ret = 0; 44 char bf[1024]; 45 46 ret += callchain__fprintf_left_margin(fp, left_margin); 47 for (i = 0; i < depth; i++) { 48 if (depth_mask & (1 << i)) 49 ret += fprintf(fp, "|"); 50 else 51 ret += fprintf(fp, " "); 52 if (!period && i == depth - 1) { 53 ret += fprintf(fp, "--"); 54 ret += callchain_node__fprintf_value(node, fp, total_samples); 55 ret += fprintf(fp, "--"); 56 } else 57 ret += fprintf(fp, "%s", " "); 58 } 59 fputs(callchain_list__sym_name(chain, bf, sizeof(bf), false), fp); 60 fputc('\n', fp); 61 return ret; 62 } 63 64 static struct symbol *rem_sq_bracket; 65 static struct callchain_list rem_hits; 66 67 static void init_rem_hits(void) 68 { 69 rem_sq_bracket = malloc(sizeof(*rem_sq_bracket) + 6); 70 if (!rem_sq_bracket) { 71 fprintf(stderr, "Not enough memory to display remaining hits\n"); 72 return; 73 } 74 75 strcpy(rem_sq_bracket->name, "[...]"); 76 rem_hits.ms.sym = rem_sq_bracket; 77 } 78 79 static size_t __callchain__fprintf_graph(FILE *fp, struct rb_root *root, 80 u64 total_samples, int depth, 81 int depth_mask, int left_margin) 82 { 83 struct rb_node *node, *next; 84 struct callchain_node *child = NULL; 85 struct callchain_list *chain; 86 int new_depth_mask = depth_mask; 87 u64 remaining; 88 size_t ret = 0; 89 int i; 90 uint entries_printed = 0; 91 int cumul_count = 0; 92 93 remaining = total_samples; 94 95 node = rb_first(root); 96 while (node) { 97 u64 new_total; 98 u64 cumul; 99 100 child = rb_entry(node, struct callchain_node, rb_node); 101 cumul = callchain_cumul_hits(child); 102 remaining -= cumul; 103 cumul_count += callchain_cumul_counts(child); 104 105 /* 106 * The depth mask manages the output of pipes that show 107 * the depth. We don't want to keep the pipes of the current 108 * level for the last child of this depth. 109 * Except if we have remaining filtered hits. They will 110 * supersede the last child 111 */ 112 next = rb_next(node); 113 if (!next && (callchain_param.mode != CHAIN_GRAPH_REL || !remaining)) 114 new_depth_mask &= ~(1 << (depth - 1)); 115 116 /* 117 * But we keep the older depth mask for the line separator 118 * to keep the level link until we reach the last child 119 */ 120 ret += ipchain__fprintf_graph_line(fp, depth, depth_mask, 121 left_margin); 122 i = 0; 123 list_for_each_entry(chain, &child->val, list) { 124 ret += ipchain__fprintf_graph(fp, child, chain, depth, 125 new_depth_mask, i++, 126 total_samples, 127 left_margin); 128 } 129 130 if (callchain_param.mode == CHAIN_GRAPH_REL) 131 new_total = child->children_hit; 132 else 133 new_total = total_samples; 134 135 ret += __callchain__fprintf_graph(fp, &child->rb_root, new_total, 136 depth + 1, 137 new_depth_mask | (1 << depth), 138 left_margin); 139 node = next; 140 if (++entries_printed == callchain_param.print_limit) 141 break; 142 } 143 144 if (callchain_param.mode == CHAIN_GRAPH_REL && 145 remaining && remaining != total_samples) { 146 struct callchain_node rem_node = { 147 .hit = remaining, 148 }; 149 150 if (!rem_sq_bracket) 151 return ret; 152 153 if (callchain_param.value == CCVAL_COUNT && child && child->parent) { 154 rem_node.count = child->parent->children_count - cumul_count; 155 if (rem_node.count <= 0) 156 return ret; 157 } 158 159 new_depth_mask &= ~(1 << (depth - 1)); 160 ret += ipchain__fprintf_graph(fp, &rem_node, &rem_hits, depth, 161 new_depth_mask, 0, total_samples, 162 left_margin); 163 } 164 165 return ret; 166 } 167 168 /* 169 * If have one single callchain root, don't bother printing 170 * its percentage (100 % in fractal mode and the same percentage 171 * than the hist in graph mode). This also avoid one level of column. 172 * 173 * However when percent-limit applied, it's possible that single callchain 174 * node have different (non-100% in fractal mode) percentage. 175 */ 176 static bool need_percent_display(struct rb_node *node, u64 parent_samples) 177 { 178 struct callchain_node *cnode; 179 180 if (rb_next(node)) 181 return true; 182 183 cnode = rb_entry(node, struct callchain_node, rb_node); 184 return callchain_cumul_hits(cnode) != parent_samples; 185 } 186 187 static size_t callchain__fprintf_graph(FILE *fp, struct rb_root *root, 188 u64 total_samples, u64 parent_samples, 189 int left_margin) 190 { 191 struct callchain_node *cnode; 192 struct callchain_list *chain; 193 u32 entries_printed = 0; 194 bool printed = false; 195 struct rb_node *node; 196 int i = 0; 197 int ret = 0; 198 char bf[1024]; 199 200 node = rb_first(root); 201 if (node && !need_percent_display(node, parent_samples)) { 202 cnode = rb_entry(node, struct callchain_node, rb_node); 203 list_for_each_entry(chain, &cnode->val, list) { 204 /* 205 * If we sort by symbol, the first entry is the same than 206 * the symbol. No need to print it otherwise it appears as 207 * displayed twice. 208 */ 209 if (!i++ && field_order == NULL && 210 sort_order && !prefixcmp(sort_order, "sym")) 211 continue; 212 if (!printed) { 213 ret += callchain__fprintf_left_margin(fp, left_margin); 214 ret += fprintf(fp, "|\n"); 215 ret += callchain__fprintf_left_margin(fp, left_margin); 216 ret += fprintf(fp, "---"); 217 left_margin += 3; 218 printed = true; 219 } else 220 ret += callchain__fprintf_left_margin(fp, left_margin); 221 222 ret += fprintf(fp, "%s\n", callchain_list__sym_name(chain, bf, sizeof(bf), 223 false)); 224 225 if (++entries_printed == callchain_param.print_limit) 226 break; 227 } 228 root = &cnode->rb_root; 229 } 230 231 if (callchain_param.mode == CHAIN_GRAPH_REL) 232 total_samples = parent_samples; 233 234 ret += __callchain__fprintf_graph(fp, root, total_samples, 235 1, 1, left_margin); 236 if (ret) { 237 /* do not add a blank line if it printed nothing */ 238 ret += fprintf(fp, "\n"); 239 } 240 241 return ret; 242 } 243 244 static size_t __callchain__fprintf_flat(FILE *fp, struct callchain_node *node, 245 u64 total_samples) 246 { 247 struct callchain_list *chain; 248 size_t ret = 0; 249 char bf[1024]; 250 251 if (!node) 252 return 0; 253 254 ret += __callchain__fprintf_flat(fp, node->parent, total_samples); 255 256 257 list_for_each_entry(chain, &node->val, list) { 258 if (chain->ip >= PERF_CONTEXT_MAX) 259 continue; 260 ret += fprintf(fp, " %s\n", callchain_list__sym_name(chain, 261 bf, sizeof(bf), false)); 262 } 263 264 return ret; 265 } 266 267 static size_t callchain__fprintf_flat(FILE *fp, struct rb_root *tree, 268 u64 total_samples) 269 { 270 size_t ret = 0; 271 u32 entries_printed = 0; 272 struct callchain_node *chain; 273 struct rb_node *rb_node = rb_first(tree); 274 275 while (rb_node) { 276 chain = rb_entry(rb_node, struct callchain_node, rb_node); 277 278 ret += fprintf(fp, " "); 279 ret += callchain_node__fprintf_value(chain, fp, total_samples); 280 ret += fprintf(fp, "\n"); 281 ret += __callchain__fprintf_flat(fp, chain, total_samples); 282 ret += fprintf(fp, "\n"); 283 if (++entries_printed == callchain_param.print_limit) 284 break; 285 286 rb_node = rb_next(rb_node); 287 } 288 289 return ret; 290 } 291 292 static size_t __callchain__fprintf_folded(FILE *fp, struct callchain_node *node) 293 { 294 const char *sep = symbol_conf.field_sep ?: ";"; 295 struct callchain_list *chain; 296 size_t ret = 0; 297 char bf[1024]; 298 bool first; 299 300 if (!node) 301 return 0; 302 303 ret += __callchain__fprintf_folded(fp, node->parent); 304 305 first = (ret == 0); 306 list_for_each_entry(chain, &node->val, list) { 307 if (chain->ip >= PERF_CONTEXT_MAX) 308 continue; 309 ret += fprintf(fp, "%s%s", first ? "" : sep, 310 callchain_list__sym_name(chain, 311 bf, sizeof(bf), false)); 312 first = false; 313 } 314 315 return ret; 316 } 317 318 static size_t callchain__fprintf_folded(FILE *fp, struct rb_root *tree, 319 u64 total_samples) 320 { 321 size_t ret = 0; 322 u32 entries_printed = 0; 323 struct callchain_node *chain; 324 struct rb_node *rb_node = rb_first(tree); 325 326 while (rb_node) { 327 328 chain = rb_entry(rb_node, struct callchain_node, rb_node); 329 330 ret += callchain_node__fprintf_value(chain, fp, total_samples); 331 ret += fprintf(fp, " "); 332 ret += __callchain__fprintf_folded(fp, chain); 333 ret += fprintf(fp, "\n"); 334 if (++entries_printed == callchain_param.print_limit) 335 break; 336 337 rb_node = rb_next(rb_node); 338 } 339 340 return ret; 341 } 342 343 static size_t hist_entry_callchain__fprintf(struct hist_entry *he, 344 u64 total_samples, int left_margin, 345 FILE *fp) 346 { 347 u64 parent_samples = he->stat.period; 348 349 if (symbol_conf.cumulate_callchain) 350 parent_samples = he->stat_acc->period; 351 352 switch (callchain_param.mode) { 353 case CHAIN_GRAPH_REL: 354 return callchain__fprintf_graph(fp, &he->sorted_chain, total_samples, 355 parent_samples, left_margin); 356 break; 357 case CHAIN_GRAPH_ABS: 358 return callchain__fprintf_graph(fp, &he->sorted_chain, total_samples, 359 parent_samples, left_margin); 360 break; 361 case CHAIN_FLAT: 362 return callchain__fprintf_flat(fp, &he->sorted_chain, total_samples); 363 break; 364 case CHAIN_FOLDED: 365 return callchain__fprintf_folded(fp, &he->sorted_chain, total_samples); 366 break; 367 case CHAIN_NONE: 368 break; 369 default: 370 pr_err("Bad callchain mode\n"); 371 } 372 373 return 0; 374 } 375 376 static int hist_entry__snprintf(struct hist_entry *he, struct perf_hpp *hpp) 377 { 378 const char *sep = symbol_conf.field_sep; 379 struct perf_hpp_fmt *fmt; 380 char *start = hpp->buf; 381 int ret; 382 bool first = true; 383 384 if (symbol_conf.exclude_other && !he->parent) 385 return 0; 386 387 hists__for_each_format(he->hists, fmt) { 388 if (perf_hpp__should_skip(fmt, he->hists)) 389 continue; 390 391 /* 392 * If there's no field_sep, we still need 393 * to display initial ' '. 394 */ 395 if (!sep || !first) { 396 ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: " "); 397 advance_hpp(hpp, ret); 398 } else 399 first = false; 400 401 if (perf_hpp__use_color() && fmt->color) 402 ret = fmt->color(fmt, hpp, he); 403 else 404 ret = fmt->entry(fmt, hpp, he); 405 406 ret = hist_entry__snprintf_alignment(he, hpp, fmt, ret); 407 advance_hpp(hpp, ret); 408 } 409 410 return hpp->buf - start; 411 } 412 413 static int hist_entry__hierarchy_fprintf(struct hist_entry *he, 414 struct perf_hpp *hpp, 415 struct hists *hists, 416 FILE *fp) 417 { 418 const char *sep = symbol_conf.field_sep; 419 struct perf_hpp_fmt *fmt; 420 struct perf_hpp_list_node *fmt_node; 421 char *buf = hpp->buf; 422 size_t size = hpp->size; 423 int ret, printed = 0; 424 bool first = true; 425 426 if (symbol_conf.exclude_other && !he->parent) 427 return 0; 428 429 ret = scnprintf(hpp->buf, hpp->size, "%*s", he->depth * HIERARCHY_INDENT, ""); 430 advance_hpp(hpp, ret); 431 432 /* the first hpp_list_node is for overhead columns */ 433 fmt_node = list_first_entry(&hists->hpp_formats, 434 struct perf_hpp_list_node, list); 435 perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) { 436 /* 437 * If there's no field_sep, we still need 438 * to display initial ' '. 439 */ 440 if (!sep || !first) { 441 ret = scnprintf(hpp->buf, hpp->size, "%s", sep ?: " "); 442 advance_hpp(hpp, ret); 443 } else 444 first = false; 445 446 if (perf_hpp__use_color() && fmt->color) 447 ret = fmt->color(fmt, hpp, he); 448 else 449 ret = fmt->entry(fmt, hpp, he); 450 451 ret = hist_entry__snprintf_alignment(he, hpp, fmt, ret); 452 advance_hpp(hpp, ret); 453 } 454 455 if (!sep) 456 ret = scnprintf(hpp->buf, hpp->size, "%*s", 457 (hists->nr_hpp_node - 2) * HIERARCHY_INDENT, ""); 458 advance_hpp(hpp, ret); 459 460 printed += fprintf(fp, "%s", buf); 461 462 perf_hpp_list__for_each_format(he->hpp_list, fmt) { 463 hpp->buf = buf; 464 hpp->size = size; 465 466 /* 467 * No need to call hist_entry__snprintf_alignment() since this 468 * fmt is always the last column in the hierarchy mode. 469 */ 470 if (perf_hpp__use_color() && fmt->color) 471 fmt->color(fmt, hpp, he); 472 else 473 fmt->entry(fmt, hpp, he); 474 475 /* 476 * dynamic entries are right-aligned but we want left-aligned 477 * in the hierarchy mode 478 */ 479 printed += fprintf(fp, "%s%s", sep ?: " ", ltrim(buf)); 480 } 481 printed += putc('\n', fp); 482 483 if (symbol_conf.use_callchain && he->leaf) { 484 u64 total = hists__total_period(hists); 485 486 printed += hist_entry_callchain__fprintf(he, total, 0, fp); 487 goto out; 488 } 489 490 out: 491 return printed; 492 } 493 494 static int hist_entry__fprintf(struct hist_entry *he, size_t size, 495 struct hists *hists, 496 char *bf, size_t bfsz, FILE *fp) 497 { 498 int ret; 499 struct perf_hpp hpp = { 500 .buf = bf, 501 .size = size, 502 }; 503 u64 total_period = hists->stats.total_period; 504 505 if (size == 0 || size > bfsz) 506 size = hpp.size = bfsz; 507 508 if (symbol_conf.report_hierarchy) 509 return hist_entry__hierarchy_fprintf(he, &hpp, hists, fp); 510 511 hist_entry__snprintf(he, &hpp); 512 513 ret = fprintf(fp, "%s\n", bf); 514 515 if (symbol_conf.use_callchain) 516 ret += hist_entry_callchain__fprintf(he, total_period, 0, fp); 517 518 return ret; 519 } 520 521 static int print_hierarchy_indent(const char *sep, int indent, 522 const char *line, FILE *fp) 523 { 524 if (sep != NULL || indent < 2) 525 return 0; 526 527 return fprintf(fp, "%-.*s", (indent - 2) * HIERARCHY_INDENT, line); 528 } 529 530 static int print_hierarchy_header(struct hists *hists, struct perf_hpp *hpp, 531 const char *sep, FILE *fp) 532 { 533 bool first_node, first_col; 534 int indent; 535 int depth; 536 unsigned width = 0; 537 unsigned header_width = 0; 538 struct perf_hpp_fmt *fmt; 539 struct perf_hpp_list_node *fmt_node; 540 541 indent = hists->nr_hpp_node; 542 543 /* preserve max indent depth for column headers */ 544 print_hierarchy_indent(sep, indent, spaces, fp); 545 546 /* the first hpp_list_node is for overhead columns */ 547 fmt_node = list_first_entry(&hists->hpp_formats, 548 struct perf_hpp_list_node, list); 549 550 perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) { 551 fmt->header(fmt, hpp, hists_to_evsel(hists)); 552 fprintf(fp, "%s%s", hpp->buf, sep ?: " "); 553 } 554 555 /* combine sort headers with ' / ' */ 556 first_node = true; 557 list_for_each_entry_continue(fmt_node, &hists->hpp_formats, list) { 558 if (!first_node) 559 header_width += fprintf(fp, " / "); 560 first_node = false; 561 562 first_col = true; 563 perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) { 564 if (perf_hpp__should_skip(fmt, hists)) 565 continue; 566 567 if (!first_col) 568 header_width += fprintf(fp, "+"); 569 first_col = false; 570 571 fmt->header(fmt, hpp, hists_to_evsel(hists)); 572 rtrim(hpp->buf); 573 574 header_width += fprintf(fp, "%s", ltrim(hpp->buf)); 575 } 576 } 577 578 fprintf(fp, "\n# "); 579 580 /* preserve max indent depth for initial dots */ 581 print_hierarchy_indent(sep, indent, dots, fp); 582 583 /* the first hpp_list_node is for overhead columns */ 584 fmt_node = list_first_entry(&hists->hpp_formats, 585 struct perf_hpp_list_node, list); 586 587 first_col = true; 588 perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) { 589 if (!first_col) 590 fprintf(fp, "%s", sep ?: ".."); 591 first_col = false; 592 593 width = fmt->width(fmt, hpp, hists_to_evsel(hists)); 594 fprintf(fp, "%.*s", width, dots); 595 } 596 597 depth = 0; 598 list_for_each_entry_continue(fmt_node, &hists->hpp_formats, list) { 599 first_col = true; 600 width = depth * HIERARCHY_INDENT; 601 602 perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) { 603 if (perf_hpp__should_skip(fmt, hists)) 604 continue; 605 606 if (!first_col) 607 width++; /* for '+' sign between column header */ 608 first_col = false; 609 610 width += fmt->width(fmt, hpp, hists_to_evsel(hists)); 611 } 612 613 if (width > header_width) 614 header_width = width; 615 616 depth++; 617 } 618 619 fprintf(fp, "%s%-.*s", sep ?: " ", header_width, dots); 620 621 fprintf(fp, "\n#\n"); 622 623 return 2; 624 } 625 626 size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows, 627 int max_cols, float min_pcnt, FILE *fp) 628 { 629 struct perf_hpp_fmt *fmt; 630 struct perf_hpp_list_node *fmt_node; 631 struct rb_node *nd; 632 size_t ret = 0; 633 unsigned int width; 634 const char *sep = symbol_conf.field_sep; 635 int nr_rows = 0; 636 char bf[96]; 637 struct perf_hpp dummy_hpp = { 638 .buf = bf, 639 .size = sizeof(bf), 640 }; 641 bool first = true; 642 size_t linesz; 643 char *line = NULL; 644 unsigned indent; 645 646 init_rem_hits(); 647 648 hists__for_each_format(hists, fmt) 649 perf_hpp__reset_width(fmt, hists); 650 651 if (symbol_conf.col_width_list_str) 652 perf_hpp__set_user_width(symbol_conf.col_width_list_str); 653 654 if (!show_header) 655 goto print_entries; 656 657 fprintf(fp, "# "); 658 659 if (symbol_conf.report_hierarchy) { 660 list_for_each_entry(fmt_node, &hists->hpp_formats, list) { 661 perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) 662 perf_hpp__reset_width(fmt, hists); 663 } 664 nr_rows += print_hierarchy_header(hists, &dummy_hpp, sep, fp); 665 goto print_entries; 666 } 667 668 hists__for_each_format(hists, fmt) { 669 if (perf_hpp__should_skip(fmt, hists)) 670 continue; 671 672 if (!first) 673 fprintf(fp, "%s", sep ?: " "); 674 else 675 first = false; 676 677 fmt->header(fmt, &dummy_hpp, hists_to_evsel(hists)); 678 fprintf(fp, "%s", bf); 679 } 680 681 fprintf(fp, "\n"); 682 if (max_rows && ++nr_rows >= max_rows) 683 goto out; 684 685 if (sep) 686 goto print_entries; 687 688 first = true; 689 690 fprintf(fp, "# "); 691 692 hists__for_each_format(hists, fmt) { 693 unsigned int i; 694 695 if (perf_hpp__should_skip(fmt, hists)) 696 continue; 697 698 if (!first) 699 fprintf(fp, "%s", sep ?: " "); 700 else 701 first = false; 702 703 width = fmt->width(fmt, &dummy_hpp, hists_to_evsel(hists)); 704 for (i = 0; i < width; i++) 705 fprintf(fp, "."); 706 } 707 708 fprintf(fp, "\n"); 709 if (max_rows && ++nr_rows >= max_rows) 710 goto out; 711 712 fprintf(fp, "#\n"); 713 if (max_rows && ++nr_rows >= max_rows) 714 goto out; 715 716 print_entries: 717 linesz = hists__sort_list_width(hists) + 3 + 1; 718 linesz += perf_hpp__color_overhead(); 719 line = malloc(linesz); 720 if (line == NULL) { 721 ret = -1; 722 goto out; 723 } 724 725 indent = hists__overhead_width(hists) + 4; 726 727 for (nd = rb_first(&hists->entries); nd; nd = __rb_hierarchy_next(nd, HMD_FORCE_CHILD)) { 728 struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node); 729 float percent; 730 731 if (h->filtered) 732 continue; 733 734 percent = hist_entry__get_percent_limit(h); 735 if (percent < min_pcnt) 736 continue; 737 738 ret += hist_entry__fprintf(h, max_cols, hists, line, linesz, fp); 739 740 if (max_rows && ++nr_rows >= max_rows) 741 break; 742 743 /* 744 * If all children are filtered out or percent-limited, 745 * display "no entry >= x.xx%" message. 746 */ 747 if (!h->leaf && !hist_entry__has_hierarchy_children(h, min_pcnt)) { 748 int depth = hists->nr_hpp_node + h->depth + 1; 749 750 print_hierarchy_indent(sep, depth, spaces, fp); 751 fprintf(fp, "%*sno entry >= %.2f%%\n", indent, "", min_pcnt); 752 753 if (max_rows && ++nr_rows >= max_rows) 754 break; 755 } 756 757 if (h->ms.map == NULL && verbose > 1) { 758 __map_groups__fprintf_maps(h->thread->mg, 759 MAP__FUNCTION, fp); 760 fprintf(fp, "%.10s end\n", graph_dotted_line); 761 } 762 } 763 764 free(line); 765 out: 766 zfree(&rem_sq_bracket); 767 768 return ret; 769 } 770 771 size_t events_stats__fprintf(struct events_stats *stats, FILE *fp) 772 { 773 int i; 774 size_t ret = 0; 775 776 for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) { 777 const char *name; 778 779 if (stats->nr_events[i] == 0) 780 continue; 781 782 name = perf_event__name(i); 783 if (!strcmp(name, "UNKNOWN")) 784 continue; 785 786 ret += fprintf(fp, "%16s events: %10d\n", name, 787 stats->nr_events[i]); 788 } 789 790 return ret; 791 } 792