tools/perf/builtin-top.c

   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 <elf.h>
  46 #include <fcntl.h>
  47
  48 #include <stdio.h>
  49 #include <termios.h>
  50 #include <unistd.h>
  51 #include <inttypes.h>
  52
  53 #include <errno.h>
  54 #include <time.h>
  55 #include <sched.h>
  56
  57 #include <sys/syscall.h>
  58 #include <sys/ioctl.h>
  59 #include <sys/poll.h>
  60 #include <sys/prctl.h>
  61 #include <sys/wait.h>
  62 #include <sys/uio.h>
  63 #include <sys/utsname.h>
  64 #include <sys/mman.h>
  65
  66 #include <linux/unistd.h>
  67 #include <linux/types.h>
  68
  69 void get_term_dimensions(struct winsize *ws)
  70 {
  71         char *s = getenv("LINES");
  72
  73         if (s != NULL) {
  74                 ws->ws_row = atoi(s);
  75                 s = getenv("COLUMNS");
  76                 if (s != NULL) {
  77                         ws->ws_col = atoi(s);
  78                         if (ws->ws_row && ws->ws_col)
  79                                 return;
  80                 }
  81         }
  82 #ifdef TIOCGWINSZ
  83         if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
  84             ws->ws_row && ws->ws_col)
  85                 return;
  86 #endif
  87         ws->ws_row = 25;
  88         ws->ws_col = 80;
  89 }
  90
  91 static void perf_top__update_print_entries(struct perf_top *top)
  92 {
  93         if (top->print_entries > 9)
  94                 top->print_entries -= 9;
  95 }
  96
  97 static void perf_top__sig_winch(int sig __used, siginfo_t *info __used, void *arg)
  98 {
  99         struct perf_top *top = arg;
 100
 101         get_term_dimensions(&top->winsize);
 102         if (!top->print_entries
 103             || (top->print_entries+4) > top->winsize.ws_row) {
 104                 top->print_entries = top->winsize.ws_row;
 105         } else {
 106                 top->print_entries += 4;
 107                 top->winsize.ws_row = top->print_entries;
 108         }
 109         perf_top__update_print_entries(top);
 110 }
 111
 112 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 113 {
 114         struct symbol *sym;
 115         struct annotation *notes;
 116         struct map *map;
 117         int err = -1;
 118
 119         if (!he || !he->ms.sym)
 120                 return -1;
 121
 122         sym = he->ms.sym;
 123         map = he->ms.map;
 124
 125         /*
 126          * We can't annotate with just /proc/kallsyms
 127          */
 128         if (map->dso->symtab_type == SYMTAB__KALLSYMS) {
 129                 pr_err("Can't annotate %s: No vmlinux file was found in the "
 130                        "path\n", sym->name);
 131                 sleep(1);
 132                 return -1;
 133         }
 134
 135         notes = symbol__annotation(sym);
 136         if (notes->src != NULL) {
 137                 pthread_mutex_lock(&notes->lock);
 138                 goto out_assign;
 139         }
 140
 141         pthread_mutex_lock(&notes->lock);
 142
 143         if (symbol__alloc_hist(sym) < 0) {
 144                 pthread_mutex_unlock(&notes->lock);
 145                 pr_err("Not enough memory for annotating '%s' symbol!\n",
 146                        sym->name);
 147                 sleep(1);
 148                 return err;
 149         }
 150
 151         err = symbol__annotate(sym, map, 0);
 152         if (err == 0) {
 153 out_assign:
 154                 top->sym_filter_entry = he;
 155         }
 156
 157         pthread_mutex_unlock(&notes->lock);
 158         return err;
 159 }
 160
 161 static void __zero_source_counters(struct hist_entry *he)
 162 {
 163         struct symbol *sym = he->ms.sym;
 164         symbol__annotate_zero_histograms(sym);
 165 }
 166
 167 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
 168 {
 169         struct utsname uts;
 170         int err = uname(&uts);
 171
 172         ui__warning("Out of bounds address found:\n\n"
 173                     "Addr:   %" PRIx64 "\n"
 174                     "DSO:    %s %c\n"
 175                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
 176                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
 177                     "Arch:   %s\n"
 178                     "Kernel: %s\n"
 179                     "Tools:  %s\n\n"
 180                     "Not all samples will be on the annotation output.\n\n"
 181                     "Please report to linux-kernel@vger.kernel.org\n",
 182                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
 183                     map->start, map->end, sym->start, sym->end,
 184                     sym->binding == STB_GLOBAL ? 'g' :
 185                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
 186                     err ? "[unknown]" : uts.machine,
 187                     err ? "[unknown]" : uts.release, perf_version_string);
 188         if (use_browser <= 0)
 189                 sleep(5);
 190
 191         map->erange_warned = true;
 192 }
 193
 194 static void perf_top__record_precise_ip(struct perf_top *top,
 195                                         struct hist_entry *he,
 196                                         int counter, u64 ip)
 197 {
 198         struct annotation *notes;
 199         struct symbol *sym;
 200         int err;
 201
 202         if (he == NULL || he->ms.sym == NULL ||
 203             ((top->sym_filter_entry == NULL ||
 204               top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
 205                 return;
 206
 207         sym = he->ms.sym;
 208         notes = symbol__annotation(sym);
 209
 210         if (pthread_mutex_trylock(&notes->lock))
 211                 return;
 212
 213         if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
 214                 pthread_mutex_unlock(&notes->lock);
 215                 pr_err("Not enough memory for annotating '%s' symbol!\n",
 216                        sym->name);
 217                 sleep(1);
 218                 return;
 219         }
 220
 221         ip = he->ms.map->map_ip(he->ms.map, ip);
 222         err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
 223
 224         pthread_mutex_unlock(&notes->lock);
 225
 226         if (err == -ERANGE && !he->ms.map->erange_warned)
 227                 ui__warn_map_erange(he->ms.map, sym, ip);
 228 }
 229
 230 static void perf_top__show_details(struct perf_top *top)
 231 {
 232         struct hist_entry *he = top->sym_filter_entry;
 233         struct annotation *notes;
 234         struct symbol *symbol;
 235         int more;
 236
 237         if (!he)
 238                 return;
 239
 240         symbol = he->ms.sym;
 241         notes = symbol__annotation(symbol);
 242
 243         pthread_mutex_lock(&notes->lock);
 244
 245         if (notes->src == NULL)
 246                 goto out_unlock;
 247
 248         printf("Showing %s for %s\n", event_name(top->sym_evsel), symbol->name);
 249         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
 250
 251         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel->idx,
 252                                        0, top->sym_pcnt_filter, top->print_entries, 4);
 253         if (top->zero)
 254                 symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
 255         else
 256                 symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
 257         if (more != 0)
 258                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 259 out_unlock:
 260         pthread_mutex_unlock(&notes->lock);
 261 }
 262
 263 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
 264
 265 static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
 266                                                      struct addr_location *al,
 267                                                      struct perf_sample *sample)
 268 {
 269         struct hist_entry *he;
 270
 271         he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
 272         if (he == NULL)
 273                 return NULL;
 274
 275         hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
 276         return he;
 277 }
 278
 279 static void perf_top__print_sym_table(struct perf_top *top)
 280 {
 281         char bf[160];
 282         int printed = 0;
 283         const int win_width = top->winsize.ws_col - 1;
 284
 285         puts(CONSOLE_CLEAR);
 286
 287         perf_top__header_snprintf(top, bf, sizeof(bf));
 288         printf("%s\n", bf);
 289
 290         perf_top__reset_sample_counters(top);
 291
 292         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 293
 294         if (top->sym_evsel->hists.stats.nr_lost_warned !=
 295             top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
 296                 top->sym_evsel->hists.stats.nr_lost_warned =
 297                         top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
 298                 color_fprintf(stdout, PERF_COLOR_RED,
 299                               "WARNING: LOST %d chunks, Check IO/CPU overload",
 300                               top->sym_evsel->hists.stats.nr_lost_warned);
 301                 ++printed;
 302         }
 303
 304         if (top->sym_filter_entry) {
 305                 perf_top__show_details(top);
 306                 return;
 307         }
 308
 309         hists__collapse_resort_threaded(&top->sym_evsel->hists);
 310         hists__output_resort_threaded(&top->sym_evsel->hists);
 311         hists__decay_entries_threaded(&top->sym_evsel->hists,
 312                                       top->hide_user_symbols,
 313                                       top->hide_kernel_symbols);
 314         hists__output_recalc_col_len(&top->sym_evsel->hists,
 315                                      top->winsize.ws_row - 3);
 316         putchar('\n');
 317         hists__fprintf(&top->sym_evsel->hists, NULL, false, false,
 318                        top->winsize.ws_row - 4 - printed, win_width, stdout);
 319 }
 320
 321 static void prompt_integer(int *target, const char *msg)
 322 {
 323         char *buf = malloc(0), *p;
 324         size_t dummy = 0;
 325         int tmp;
 326
 327         fprintf(stdout, "\n%s: ", msg);
 328         if (getline(&buf, &dummy, stdin) < 0)
 329                 return;
 330
 331         p = strchr(buf, '\n');
 332         if (p)
 333                 *p = 0;
 334
 335         p = buf;
 336         while(*p) {
 337                 if (!isdigit(*p))
 338                         goto out_free;
 339                 p++;
 340         }
 341         tmp = strtoul(buf, NULL, 10);
 342         *target = tmp;
 343 out_free:
 344         free(buf);
 345 }
 346
 347 static void prompt_percent(int *target, const char *msg)
 348 {
 349         int tmp = 0;
 350
 351         prompt_integer(&tmp, msg);
 352         if (tmp >= 0 && tmp <= 100)
 353                 *target = tmp;
 354 }
 355
 356 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 357 {
 358         char *buf = malloc(0), *p;
 359         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
 360         struct rb_node *next;
 361         size_t dummy = 0;
 362
 363         /* zero counters of active symbol */
 364         if (syme) {
 365                 __zero_source_counters(syme);
 366                 top->sym_filter_entry = NULL;
 367         }
 368
 369         fprintf(stdout, "\n%s: ", msg);
 370         if (getline(&buf, &dummy, stdin) < 0)
 371                 goto out_free;
 372
 373         p = strchr(buf, '\n');
 374         if (p)
 375                 *p = 0;
 376
 377         next = rb_first(&top->sym_evsel->hists.entries);
 378         while (next) {
 379                 n = rb_entry(next, struct hist_entry, rb_node);
 380                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
 381                         found = n;
 382                         break;
 383                 }
 384                 next = rb_next(&n->rb_node);
 385         }
 386
 387         if (!found) {
 388                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
 389                 sleep(1);
 390         } else
 391                 perf_top__parse_source(top, found);
 392
 393 out_free:
 394         free(buf);
 395 }
 396
 397 static void perf_top__print_mapped_keys(struct perf_top *top)
 398 {
 399         char *name = NULL;
 400
 401         if (top->sym_filter_entry) {
 402                 struct symbol *sym = top->sym_filter_entry->ms.sym;
 403                 name = sym->name;
 404         }
 405
 406         fprintf(stdout, "\nMapped keys:\n");
 407         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
 408         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
 409
 410         if (top->evlist->nr_entries > 1)
 411                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(top->sym_evsel));
 412
 413         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
 414
 415         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
 416         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 417         fprintf(stdout, "\t[S]     stop annotation.\n");
 418
 419         fprintf(stdout,
 420                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
 421                 top->hide_kernel_symbols ? "yes" : "no");
 422         fprintf(stdout,
 423                 "\t[U]     hide user symbols.               \t(%s)\n",
 424                 top->hide_user_symbols ? "yes" : "no");
 425         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
 426         fprintf(stdout, "\t[qQ]    quit.\n");
 427 }
 428
 429 static int perf_top__key_mapped(struct perf_top *top, int c)
 430 {
 431         switch (c) {
 432                 case 'd':
 433                 case 'e':
 434                 case 'f':
 435                 case 'z':
 436                 case 'q':
 437                 case 'Q':
 438                 case 'K':
 439                 case 'U':
 440                 case 'F':
 441                 case 's':
 442                 case 'S':
 443                         return 1;
 444                 case 'E':
 445                         return top->evlist->nr_entries > 1 ? 1 : 0;
 446                 default:
 447                         break;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static void perf_top__handle_keypress(struct perf_top *top, int c)
 454 {
 455         if (!perf_top__key_mapped(top, c)) {
 456                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 457                 struct termios tc, save;
 458
 459                 perf_top__print_mapped_keys(top);
 460                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 461                 fflush(stdout);
 462
 463                 tcgetattr(0, &save);
 464                 tc = save;
 465                 tc.c_lflag &= ~(ICANON | ECHO);
 466                 tc.c_cc[VMIN] = 0;
 467                 tc.c_cc[VTIME] = 0;
 468                 tcsetattr(0, TCSANOW, &tc);
 469
 470                 poll(&stdin_poll, 1, -1);
 471                 c = getc(stdin);
 472
 473                 tcsetattr(0, TCSAFLUSH, &save);
 474                 if (!perf_top__key_mapped(top, c))
 475                         return;
 476         }
 477
 478         switch (c) {
 479                 case 'd':
 480                         prompt_integer(&top->delay_secs, "Enter display delay");
 481                         if (top->delay_secs < 1)
 482                                 top->delay_secs = 1;
 483                         break;
 484                 case 'e':
 485                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
 486                         if (top->print_entries == 0) {
 487                                 struct sigaction act = {
 488                                         .sa_sigaction = perf_top__sig_winch,
 489                                         .sa_flags     = SA_SIGINFO,
 490                                 };
 491                                 perf_top__sig_winch(SIGWINCH, NULL, top);
 492                                 sigaction(SIGWINCH, &act, NULL);
 493                         } else {
 494                                 perf_top__sig_winch(SIGWINCH, NULL, top);
 495                                 signal(SIGWINCH, SIG_DFL);
 496                         }
 497                         break;
 498                 case 'E':
 499                         if (top->evlist->nr_entries > 1) {
 500                                 /* Select 0 as the default event: */
 501                                 int counter = 0;
 502
 503                                 fprintf(stderr, "\nAvailable events:");
 504
 505                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 506                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, event_name(top->sym_evsel));
 507
 508                                 prompt_integer(&counter, "Enter details event counter");
 509
 510                                 if (counter >= top->evlist->nr_entries) {
 511                                         top->sym_evsel = list_entry(top->evlist->entries.next, struct perf_evsel, node);
 512                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(top->sym_evsel));
 513                                         sleep(1);
 514                                         break;
 515                                 }
 516                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 517                                         if (top->sym_evsel->idx == counter)
 518                                                 break;
 519                         } else
 520                                 top->sym_evsel = list_entry(top->evlist->entries.next, struct perf_evsel, node);
 521                         break;
 522                 case 'f':
 523                         prompt_integer(&top->count_filter, "Enter display event count filter");
 524                         break;
 525                 case 'F':
 526                         prompt_percent(&top->sym_pcnt_filter,
 527                                        "Enter details display event filter (percent)");
 528                         break;
 529                 case 'K':
 530                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
 531                         break;
 532                 case 'q':
 533                 case 'Q':
 534                         printf("exiting.\n");
 535                         if (top->dump_symtab)
 536                                 perf_session__fprintf_dsos(top->session, stderr);
 537                         exit(0);
 538                 case 's':
 539                         perf_top__prompt_symbol(top, "Enter details symbol");
 540                         break;
 541                 case 'S':
 542                         if (!top->sym_filter_entry)
 543                                 break;
 544                         else {
 545                                 struct hist_entry *syme = top->sym_filter_entry;
 546
 547                                 top->sym_filter_entry = NULL;
 548                                 __zero_source_counters(syme);
 549                         }
 550                         break;
 551                 case 'U':
 552                         top->hide_user_symbols = !top->hide_user_symbols;
 553                         break;
 554                 case 'z':
 555                         top->zero = !top->zero;
 556                         break;
 557                 default:
 558                         break;
 559         }
 560 }
 561
 562 static void perf_top__sort_new_samples(void *arg)
 563 {
 564         struct perf_top *t = arg;
 565         perf_top__reset_sample_counters(t);
 566
 567         if (t->evlist->selected != NULL)
 568                 t->sym_evsel = t->evlist->selected;
 569
 570         hists__collapse_resort_threaded(&t->sym_evsel->hists);
 571         hists__output_resort_threaded(&t->sym_evsel->hists);
 572         hists__decay_entries_threaded(&t->sym_evsel->hists,
 573                                       t->hide_user_symbols,
 574                                       t->hide_kernel_symbols);
 575 }
 576
 577 static void *display_thread_tui(void *arg)
 578 {
 579         struct perf_evsel *pos;
 580         struct perf_top *top = arg;
 581         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
 582
 583         perf_top__sort_new_samples(top);
 584
 585         /*
 586          * Initialize the uid_filter_str, in the future the TUI will allow
 587          * Zooming in/out UIDs. For now juse use whatever the user passed
 588          * via --uid.
 589          */
 590         list_for_each_entry(pos, &top->evlist->entries, node)
 591                 pos->hists.uid_filter_str = top->uid_str;
 592
 593         perf_evlist__tui_browse_hists(top->evlist, help,
 594                                       perf_top__sort_new_samples,
 595                                       top, top->delay_secs);
 596
 597         exit_browser(0);
 598         exit(0);
 599         return NULL;
 600 }
 601
 602 static void *display_thread(void *arg)
 603 {
 604         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 605         struct termios tc, save;
 606         struct perf_top *top = arg;
 607         int delay_msecs, c;
 608
 609         tcgetattr(0, &save);
 610         tc = save;
 611         tc.c_lflag &= ~(ICANON | ECHO);
 612         tc.c_cc[VMIN] = 0;
 613         tc.c_cc[VTIME] = 0;
 614
 615         pthread__unblock_sigwinch();
 616 repeat:
 617         delay_msecs = top->delay_secs * 1000;
 618         tcsetattr(0, TCSANOW, &tc);
 619         /* trash return*/
 620         getc(stdin);
 621
 622         while (1) {
 623                 perf_top__print_sym_table(top);
 624                 /*
 625                  * Either timeout expired or we got an EINTR due to SIGWINCH,
 626                  * refresh screen in both cases.
 627                  */
 628                 switch (poll(&stdin_poll, 1, delay_msecs)) {
 629                 case 0:
 630                         continue;
 631                 case -1:
 632                         if (errno == EINTR)
 633                                 continue;
 634                         /* Fall trhu */
 635                 default:
 636                         goto process_hotkey;
 637                 }
 638         }
 639 process_hotkey:
 640         c = getc(stdin);
 641         tcsetattr(0, TCSAFLUSH, &save);
 642
 643         perf_top__handle_keypress(top, c);
 644         goto repeat;
 645
 646         return NULL;
 647 }
 648
 649 /* Tag samples to be skipped. */
 650 static const char *skip_symbols[] = {
 651         "intel_idle",
 652         "default_idle",
 653         "native_safe_halt",
 654         "cpu_idle",
 655         "enter_idle",
 656         "exit_idle",
 657         "mwait_idle",
 658         "mwait_idle_with_hints",
 659         "poll_idle",
 660         "ppc64_runlatch_off",
 661         "pseries_dedicated_idle_sleep",
 662         NULL
 663 };
 664
 665 static int symbol_filter(struct map *map __used, struct symbol *sym)
 666 {
 667         const char *name = sym->name;
 668         int i;
 669
 670         /*
 671          * ppc64 uses function descriptors and appends a '.' to the
 672          * start of every instruction address. Remove it.
 673          */
 674         if (name[0] == '.')
 675                 name++;
 676
 677         if (!strcmp(name, "_text") ||
 678             !strcmp(name, "_etext") ||
 679             !strcmp(name, "_sinittext") ||
 680             !strncmp("init_module", name, 11) ||
 681             !strncmp("cleanup_module", name, 14) ||
 682             strstr(name, "_text_start") ||
 683             strstr(name, "_text_end"))
 684                 return 1;
 685
 686         for (i = 0; skip_symbols[i]; i++) {
 687                 if (!strcmp(skip_symbols[i], name)) {
 688                         sym->ignore = true;
 689                         break;
 690                 }
 691         }
 692
 693         return 0;
 694 }
 695
 696 static void perf_event__process_sample(struct perf_tool *tool,
 697                                        const union perf_event *event,
 698                                        struct perf_evsel *evsel,
 699                                        struct perf_sample *sample,
 700                                        struct machine *machine)
 701 {
 702         struct perf_top *top = container_of(tool, struct perf_top, tool);
 703         struct symbol *parent = NULL;
 704         u64 ip = event->ip.ip;
 705         struct addr_location al;
 706         int err;
 707
 708         if (!machine && perf_guest) {
 709                 pr_err("Can't find guest [%d]'s kernel information\n",
 710                         event->ip.pid);
 711                 return;
 712         }
 713
 714         if (!machine) {
 715                 pr_err("%u unprocessable samples recorded.",
 716                        top->session->hists.stats.nr_unprocessable_samples++);
 717                 return;
 718         }
 719
 720         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
 721                 top->exact_samples++;
 722
 723         if (perf_event__preprocess_sample(event, machine, &al, sample,
 724                                           symbol_filter) < 0 ||
 725             al.filtered)
 726                 return;
 727
 728         if (!top->kptr_restrict_warned &&
 729             symbol_conf.kptr_restrict &&
 730             al.cpumode == PERF_RECORD_MISC_KERNEL) {
 731                 ui__warning(
 732 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
 733 "Check /proc/sys/kernel/kptr_restrict.\n\n"
 734 "Kernel%s samples will not be resolved.\n",
 735                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
 736                           " modules" : "");
 737                 if (use_browser <= 0)
 738                         sleep(5);
 739                 top->kptr_restrict_warned = true;
 740         }
 741
 742         if (al.sym == NULL) {
 743                 const char *msg = "Kernel samples will not be resolved.\n";
 744                 /*
 745                  * As we do lazy loading of symtabs we only will know if the
 746                  * specified vmlinux file is invalid when we actually have a
 747                  * hit in kernel space and then try to load it. So if we get
 748                  * here and there are _no_ symbols in the DSO backing the
 749                  * kernel map, bail out.
 750                  *
 751                  * We may never get here, for instance, if we use -K/
 752                  * --hide-kernel-symbols, even if the user specifies an
 753                  * invalid --vmlinux ;-)
 754                  */
 755                 if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
 756                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 757                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 758                         if (symbol_conf.vmlinux_name) {
 759                                 ui__warning("The %s file can't be used.\n%s",
 760                                             symbol_conf.vmlinux_name, msg);
 761                         } else {
 762                                 ui__warning("A vmlinux file was not found.\n%s",
 763                                             msg);
 764                         }
 765
 766                         if (use_browser <= 0)
 767                                 sleep(5);
 768                         top->vmlinux_warned = true;
 769                 }
 770         }
 771
 772         if (al.sym == NULL || !al.sym->ignore) {
 773                 struct hist_entry *he;
 774
 775                 if ((sort__has_parent || symbol_conf.use_callchain) &&
 776                     sample->callchain) {
 777                         err = machine__resolve_callchain(machine, evsel, al.thread,
 778                                                          sample->callchain, &parent);
 779                         if (err)
 780                                 return;
 781                 }
 782
 783                 he = perf_evsel__add_hist_entry(evsel, &al, sample);
 784                 if (he == NULL) {
 785                         pr_err("Problem incrementing symbol period, skipping event\n");
 786                         return;
 787                 }
 788
 789                 if (symbol_conf.use_callchain) {
 790                         err = callchain_append(he->callchain, &evsel->hists.callchain_cursor,
 791                                                sample->period);
 792                         if (err)
 793                                 return;
 794                 }
 795
 796                 if (top->sort_has_symbols)
 797                         perf_top__record_precise_ip(top, he, evsel->idx, ip);
 798         }
 799
 800         return;
 801 }
 802
 803 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 804 {
 805         struct perf_sample sample;
 806         struct perf_evsel *evsel;
 807         struct perf_session *session = top->session;
 808         union perf_event *event;
 809         struct machine *machine;
 810         u8 origin;
 811         int ret;
 812
 813         while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
 814                 ret = perf_session__parse_sample(session, event, &sample);
 815                 if (ret) {
 816                         pr_err("Can't parse sample, err = %d\n", ret);
 817                         continue;
 818                 }
 819
 820                 evsel = perf_evlist__id2evsel(session->evlist, sample.id);
 821                 assert(evsel != NULL);
 822
 823                 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 824
 825                 if (event->header.type == PERF_RECORD_SAMPLE)
 826                         ++top->samples;
 827
 828                 switch (origin) {
 829                 case PERF_RECORD_MISC_USER:
 830                         ++top->us_samples;
 831                         if (top->hide_user_symbols)
 832                                 continue;
 833                         machine = perf_session__find_host_machine(session);
 834                         break;
 835                 case PERF_RECORD_MISC_KERNEL:
 836                         ++top->kernel_samples;
 837                         if (top->hide_kernel_symbols)
 838                                 continue;
 839                         machine = perf_session__find_host_machine(session);
 840                         break;
 841                 case PERF_RECORD_MISC_GUEST_KERNEL:
 842                         ++top->guest_kernel_samples;
 843                         machine = perf_session__find_machine(session, event->ip.pid);
 844                         break;
 845                 case PERF_RECORD_MISC_GUEST_USER:
 846                         ++top->guest_us_samples;
 847                         /*
 848                          * TODO: we don't process guest user from host side
 849                          * except simple counting.
 850                          */
 851                         /* Fall thru */
 852                 default:
 853                         continue;
 854                 }
 855
 856
 857                 if (event->header.type == PERF_RECORD_SAMPLE) {
 858                         perf_event__process_sample(&top->tool, event, evsel,
 859                                                    &sample, machine);
 860                 } else if (event->header.type < PERF_RECORD_MAX) {
 861                         hists__inc_nr_events(&evsel->hists, event->header.type);
 862                         perf_event__process(&top->tool, event, &sample, machine);
 863                 } else
 864                         ++session->hists.stats.nr_unknown_events;
 865         }
 866 }
 867
 868 static void perf_top__mmap_read(struct perf_top *top)
 869 {
 870         int i;
 871
 872         for (i = 0; i < top->evlist->nr_mmaps; i++)
 873                 perf_top__mmap_read_idx(top, i);
 874 }
 875
 876 static void perf_top__start_counters(struct perf_top *top)
 877 {
 878         struct perf_evsel *counter, *first;
 879         struct perf_evlist *evlist = top->evlist;
 880
 881         first = list_entry(evlist->entries.next, struct perf_evsel, node);
 882
 883         list_for_each_entry(counter, &evlist->entries, node) {
 884                 struct perf_event_attr *attr = &counter->attr;
 885                 struct xyarray *group_fd = NULL;
 886
 887                 if (top->group && counter != first)
 888                         group_fd = first->fd;
 889
 890                 attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 891
 892                 if (top->freq) {
 893                         attr->sample_type |= PERF_SAMPLE_PERIOD;
 894                         attr->freq        = 1;
 895                         attr->sample_freq = top->freq;
 896                 }
 897
 898                 if (evlist->nr_entries > 1) {
 899                         attr->sample_type |= PERF_SAMPLE_ID;
 900                         attr->read_format |= PERF_FORMAT_ID;
 901                 }
 902
 903                 if (symbol_conf.use_callchain)
 904                         attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
 905
 906                 attr->mmap = 1;
 907                 attr->comm = 1;
 908                 attr->inherit = top->inherit;
 909 fallback_missing_features:
 910                 if (top->exclude_guest_missing)
 911                         attr->exclude_guest = attr->exclude_host = 0;
 912 retry_sample_id:
 913                 attr->sample_id_all = top->sample_id_all_missing ? 0 : 1;
 914 try_again:
 915                 if (perf_evsel__open(counter, top->evlist->cpus,
 916                                      top->evlist->threads, top->group,
 917                                      group_fd) < 0) {
 918                         int err = errno;
 919
 920                         if (err == EPERM || err == EACCES) {
 921                                 ui__error_paranoid();
 922                                 goto out_err;
 923                         } else if (err == EINVAL) {
 924                                 if (!top->exclude_guest_missing &&
 925                                     (attr->exclude_guest || attr->exclude_host)) {
 926                                         pr_debug("Old kernel, cannot exclude "
 927                                                  "guest or host samples.\n");
 928                                         top->exclude_guest_missing = true;
 929                                         goto fallback_missing_features;
 930                                 } else if (!top->sample_id_all_missing) {
 931                                         /*
 932                                          * Old kernel, no attr->sample_id_type_all field
 933                                          */
 934                                         top->sample_id_all_missing = true;
 935                                         goto retry_sample_id;
 936                                 }
 937                         }
 938                         /*
 939                          * If it's cycles then fall back to hrtimer
 940                          * based cpu-clock-tick sw counter, which
 941                          * is always available even if no PMU support:
 942                          */
 943                         if (attr->type == PERF_TYPE_HARDWARE &&
 944                             attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 945                                 if (verbose)
 946                                         ui__warning("Cycles event not supported,\n"
 947                                                     "trying to fall back to cpu-clock-ticks\n");
 948
 949                                 attr->type = PERF_TYPE_SOFTWARE;
 950                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 951                                 goto try_again;
 952                         }
 953
 954                         if (err == ENOENT) {
 955                                 ui__warning("The %s event is not supported.\n",
 956                                             event_name(counter));
 957                                 goto out_err;
 958                         } else if (err == EMFILE) {
 959                                 ui__warning("Too many events are opened.\n"
 960                                             "Try again after reducing the number of events\n");
 961                                 goto out_err;
 962                         }
 963
 964                         ui__warning("The sys_perf_event_open() syscall "
 965                                     "returned with %d (%s).  /bin/dmesg "
 966                                     "may provide additional information.\n"
 967                                     "No CONFIG_PERF_EVENTS=y kernel support "
 968                                     "configured?\n", err, strerror(err));
 969                         goto out_err;
 970                 }
 971         }
 972
 973         if (perf_evlist__mmap(evlist, top->mmap_pages, false) < 0) {
 974                 ui__warning("Failed to mmap with %d (%s)\n",
 975                             errno, strerror(errno));
 976                 goto out_err;
 977         }
 978
 979         return;
 980
 981 out_err:
 982         exit_browser(0);
 983         exit(0);
 984 }
 985
 986 static int perf_top__setup_sample_type(struct perf_top *top)
 987 {
 988         if (!top->sort_has_symbols) {
 989                 if (symbol_conf.use_callchain) {
 990                         ui__warning("Selected -g but \"sym\" not present in --sort/-s.");
 991                         return -EINVAL;
 992                 }
 993         } else if (!top->dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
 994                 if (callchain_register_param(&callchain_param) < 0) {
 995                         ui__warning("Can't register callchain params.\n");
 996                         return -EINVAL;
 997                 }
 998         }
 999
1000         return 0;
1001 }
1002
1003 static int __cmd_top(struct perf_top *top)
1004 {
1005         pthread_t thread;
1006         int ret;
1007         /*
1008          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
1009          * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
1010          */
1011         top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
1012         if (top->session == NULL)
1013                 return -ENOMEM;
1014
1015         ret = perf_top__setup_sample_type(top);
1016         if (ret)
1017                 goto out_delete;
1018
1019         if (top->target_tid || top->uid != UINT_MAX)
1020                 perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
1021                                                   perf_event__process,
1022                                                   &top->session->host_machine);
1023         else
1024                 perf_event__synthesize_threads(&top->tool, perf_event__process,
1025                                                &top->session->host_machine);
1026         perf_top__start_counters(top);
1027         top->session->evlist = top->evlist;
1028         perf_session__update_sample_type(top->session);
1029
1030         /* Wait for a minimal set of events before starting the snapshot */
1031         poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1032
1033         perf_top__mmap_read(top);
1034
1035         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1036                                                             display_thread), top)) {
1037                 printf("Could not create display thread.\n");
1038                 exit(-1);
1039         }
1040
1041         if (top->realtime_prio) {
1042                 struct sched_param param;
1043
1044                 param.sched_priority = top->realtime_prio;
1045                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1046                         printf("Could not set realtime priority.\n");
1047                         exit(-1);
1048                 }
1049         }
1050
1051         while (1) {
1052                 u64 hits = top->samples;
1053
1054                 perf_top__mmap_read(top);
1055
1056                 if (hits == top->samples)
1057                         ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1058         }
1059
1060 out_delete:
1061         perf_session__delete(top->session);
1062         top->session = NULL;
1063
1064         return 0;
1065 }
1066
1067 static int
1068 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1069 {
1070         struct perf_top *top = (struct perf_top *)opt->value;
1071         char *tok, *tok2;
1072         char *endptr;
1073
1074         /*
1075          * --no-call-graph
1076          */
1077         if (unset) {
1078                 top->dont_use_callchains = true;
1079                 return 0;
1080         }
1081
1082         symbol_conf.use_callchain = true;
1083
1084         if (!arg)
1085                 return 0;
1086
1087         tok = strtok((char *)arg, ",");
1088         if (!tok)
1089                 return -1;
1090
1091         /* get the output mode */
1092         if (!strncmp(tok, "graph", strlen(arg)))
1093                 callchain_param.mode = CHAIN_GRAPH_ABS;
1094
1095         else if (!strncmp(tok, "flat", strlen(arg)))
1096                 callchain_param.mode = CHAIN_FLAT;
1097
1098         else if (!strncmp(tok, "fractal", strlen(arg)))
1099                 callchain_param.mode = CHAIN_GRAPH_REL;
1100
1101         else if (!strncmp(tok, "none", strlen(arg))) {
1102                 callchain_param.mode = CHAIN_NONE;
1103                 symbol_conf.use_callchain = false;
1104
1105                 return 0;
1106         } else
1107                 return -1;
1108
1109         /* get the min percentage */
1110         tok = strtok(NULL, ",");
1111         if (!tok)
1112                 goto setup;
1113
1114         callchain_param.min_percent = strtod(tok, &endptr);
1115         if (tok == endptr)
1116                 return -1;
1117
1118         /* get the print limit */
1119         tok2 = strtok(NULL, ",");
1120         if (!tok2)
1121                 goto setup;
1122
1123         if (tok2[0] != 'c') {
1124                 callchain_param.print_limit = strtod(tok2, &endptr);
1125                 tok2 = strtok(NULL, ",");
1126                 if (!tok2)
1127                         goto setup;
1128         }
1129
1130         /* get the call chain order */
1131         if (!strcmp(tok2, "caller"))
1132                 callchain_param.order = ORDER_CALLER;
1133         else if (!strcmp(tok2, "callee"))
1134                 callchain_param.order = ORDER_CALLEE;
1135         else
1136                 return -1;
1137 setup:
1138         if (callchain_register_param(&callchain_param) < 0) {
1139                 fprintf(stderr, "Can't register callchain params\n");
1140                 return -1;
1141         }
1142         return 0;
1143 }
1144
1145 static const char * const top_usage[] = {
1146         "perf top [<options>]",
1147         NULL
1148 };
1149
1150 int cmd_top(int argc, const char **argv, const char *prefix __used)
1151 {
1152         struct perf_evsel *pos;
1153         int status = -ENOMEM;
1154         struct perf_top top = {
1155                 .count_filter        = 5,
1156                 .delay_secs          = 2,
1157                 .uid                 = UINT_MAX,
1158                 .freq                = 1000, /* 1 KHz */
1159                 .mmap_pages          = 128,
1160                 .sym_pcnt_filter     = 5,
1161         };
1162         char callchain_default_opt[] = "fractal,0.5,callee";
1163         const struct option options[] = {
1164         OPT_CALLBACK('e', "event", &top.evlist, "event",
1165                      "event selector. use 'perf list' to list available events",
1166                      parse_events_option),
1167         OPT_INTEGER('c', "count", &top.default_interval,
1168                     "event period to sample"),
1169         OPT_STRING('p', "pid", &top.target_pid, "pid",
1170                     "profile events on existing process id"),
1171         OPT_STRING('t', "tid", &top.target_tid, "tid",
1172                     "profile events on existing thread id"),
1173         OPT_BOOLEAN('a', "all-cpus", &top.system_wide,
1174                             "system-wide collection from all CPUs"),
1175         OPT_STRING('C', "cpu", &top.cpu_list, "cpu",
1176                     "list of cpus to monitor"),
1177         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1178                    "file", "vmlinux pathname"),
1179         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1180                     "hide kernel symbols"),
1181         OPT_UINTEGER('m', "mmap-pages", &top.mmap_pages, "number of mmap data pages"),
1182         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1183                     "collect data with this RT SCHED_FIFO priority"),
1184         OPT_INTEGER('d', "delay", &top.delay_secs,
1185                     "number of seconds to delay between refreshes"),
1186         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1187                             "dump the symbol table used for profiling"),
1188         OPT_INTEGER('f', "count-filter", &top.count_filter,
1189                     "only display functions with more events than this"),
1190         OPT_BOOLEAN('g', "group", &top.group,
1191                             "put the counters into a counter group"),
1192         OPT_BOOLEAN('i', "inherit", &top.inherit,
1193                     "child tasks inherit counters"),
1194         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1195                     "symbol to annotate"),
1196         OPT_BOOLEAN('z', "zero", &top.zero,
1197                     "zero history across updates"),
1198         OPT_INTEGER('F', "freq", &top.freq,
1199                     "profile at this frequency"),
1200         OPT_INTEGER('E', "entries", &top.print_entries,
1201                     "display this many functions"),
1202         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1203                     "hide user symbols"),
1204         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1205         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1206         OPT_INCR('v', "verbose", &verbose,
1207                     "be more verbose (show counter open errors, etc)"),
1208         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1209                    "sort by key(s): pid, comm, dso, symbol, parent"),
1210         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1211                     "Show a column with the number of samples"),
1212         OPT_CALLBACK_DEFAULT('G', "call-graph", &top, "output_type,min_percent, call_order",
1213                      "Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
1214                      "Default: fractal,0.5,callee", &parse_callchain_opt,
1215                      callchain_default_opt),
1216         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1217                     "Show a column with the sum of periods"),
1218         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1219                    "only consider symbols in these dsos"),
1220         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1221                    "only consider symbols in these comms"),
1222         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1223                    "only consider these symbols"),
1224         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1225                     "Interleave source code with assembly code (default)"),
1226         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1227                     "Display raw encoding of assembly instructions (default)"),
1228         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1229                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1230         OPT_STRING('u', "uid", &top.uid_str, "user", "user to profile"),
1231         OPT_END()
1232         };
1233
1234         top.evlist = perf_evlist__new(NULL, NULL);
1235         if (top.evlist == NULL)
1236                 return -ENOMEM;
1237
1238         symbol_conf.exclude_other = false;
1239
1240         argc = parse_options(argc, argv, options, top_usage, 0);
1241         if (argc)
1242                 usage_with_options(top_usage, options);
1243
1244         if (sort_order == default_sort_order)
1245                 sort_order = "dso,symbol";
1246
1247         setup_sorting(top_usage, options);
1248
1249         if (top.use_stdio)
1250                 use_browser = 0;
1251         else if (top.use_tui)
1252                 use_browser = 1;
1253
1254         setup_browser(false);
1255
1256         top.uid = parse_target_uid(top.uid_str, top.target_tid, top.target_pid);
1257         if (top.uid_str != NULL && top.uid == UINT_MAX - 1)
1258                 goto out_delete_evlist;
1259
1260         /* CPU and PID are mutually exclusive */
1261         if (top.target_tid && top.cpu_list) {
1262                 printf("WARNING: PID switch overriding CPU\n");
1263                 sleep(1);
1264                 top.cpu_list = NULL;
1265         }
1266
1267         if (top.target_pid)
1268                 top.target_tid = top.target_pid;
1269
1270         if (perf_evlist__create_maps(top.evlist, top.target_pid,
1271                                      top.target_tid, top.uid, top.cpu_list) < 0)
1272                 usage_with_options(top_usage, options);
1273
1274         if (!top.evlist->nr_entries &&
1275             perf_evlist__add_default(top.evlist) < 0) {
1276                 pr_err("Not enough memory for event selector list\n");
1277                 return -ENOMEM;
1278         }
1279
1280         symbol_conf.nr_events = top.evlist->nr_entries;
1281
1282         if (top.delay_secs < 1)
1283                 top.delay_secs = 1;
1284
1285         /*
1286          * User specified count overrides default frequency.
1287          */
1288         if (top.default_interval)
1289                 top.freq = 0;
1290         else if (top.freq) {
1291                 top.default_interval = top.freq;
1292         } else {
1293                 fprintf(stderr, "frequency and count are zero, aborting\n");
1294                 exit(EXIT_FAILURE);
1295         }
1296
1297         list_for_each_entry(pos, &top.evlist->entries, node) {
1298                 /*
1299                  * Fill in the ones not specifically initialized via -c:
1300                  */
1301                 if (!pos->attr.sample_period)
1302                         pos->attr.sample_period = top.default_interval;
1303         }
1304
1305         top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
1306
1307         symbol_conf.priv_size = sizeof(struct annotation);
1308
1309         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1310         if (symbol__init() < 0)
1311                 return -1;
1312
1313         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
1314         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
1315         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
1316
1317         /*
1318          * Avoid annotation data structures overhead when symbols aren't on the
1319          * sort list.
1320          */
1321         top.sort_has_symbols = sort_sym.list.next != NULL;
1322
1323         get_term_dimensions(&top.winsize);
1324         if (top.print_entries == 0) {
1325                 struct sigaction act = {
1326                         .sa_sigaction = perf_top__sig_winch,
1327                         .sa_flags     = SA_SIGINFO,
1328                 };
1329                 perf_top__update_print_entries(&top);
1330                 sigaction(SIGWINCH, &act, NULL);
1331         }
1332
1333         status = __cmd_top(&top);
1334
1335 out_delete_evlist:
1336         perf_evlist__delete(top.evlist);
1337
1338         return status;
1339 }