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/machine.h"
  30 #include "util/session.h"
  31 #include "util/symbol.h"
  32 #include "util/thread.h"
  33 #include "util/thread_map.h"
  34 #include "util/top.h"
  35 #include "util/util.h"
  36 #include <linux/rbtree.h>
  37 #include <subcmd/parse-options.h>
  38 #include "util/parse-events.h"
  39 #include "util/cpumap.h"
  40 #include "util/xyarray.h"
  41 #include "util/sort.h"
  42 #include "util/intlist.h"
  43 #include "util/parse-branch-options.h"
  44 #include "arch/common.h"
  45
  46 #include "util/debug.h"
  47
  48 #include <assert.h>
  49 #include <elf.h>
  50 #include <fcntl.h>
  51
  52 #include <stdio.h>
  53 #include <termios.h>
  54 #include <unistd.h>
  55 #include <inttypes.h>
  56
  57 #include <errno.h>
  58 #include <time.h>
  59 #include <sched.h>
  60
  61 #include <sys/syscall.h>
  62 #include <sys/ioctl.h>
  63 #include <poll.h>
  64 #include <sys/prctl.h>
  65 #include <sys/wait.h>
  66 #include <sys/uio.h>
  67 #include <sys/utsname.h>
  68 #include <sys/mman.h>
  69
  70 #include <linux/types.h>
  71
  72 static volatile int done;
  73
  74 #define HEADER_LINE_NR  5
  75
  76 static void perf_top__update_print_entries(struct perf_top *top)
  77 {
  78         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
  79 }
  80
  81 static void perf_top__sig_winch(int sig __maybe_unused,
  82                                 siginfo_t *info __maybe_unused, void *arg)
  83 {
  84         struct perf_top *top = arg;
  85
  86         get_term_dimensions(&top->winsize);
  87         perf_top__update_print_entries(top);
  88 }
  89
  90 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
  91 {
  92         struct symbol *sym;
  93         struct annotation *notes;
  94         struct map *map;
  95         int err = -1;
  96
  97         if (!he || !he->ms.sym)
  98                 return -1;
  99
 100         sym = he->ms.sym;
 101         map = he->ms.map;
 102
 103         /*
 104          * We can't annotate with just /proc/kallsyms
 105          */
 106         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
 107             !dso__is_kcore(map->dso)) {
 108                 pr_err("Can't annotate %s: No vmlinux file was found in the "
 109                        "path\n", sym->name);
 110                 sleep(1);
 111                 return -1;
 112         }
 113
 114         notes = symbol__annotation(sym);
 115         if (notes->src != NULL) {
 116                 pthread_mutex_lock(&notes->lock);
 117                 goto out_assign;
 118         }
 119
 120         pthread_mutex_lock(&notes->lock);
 121
 122         if (symbol__alloc_hist(sym) < 0) {
 123                 pthread_mutex_unlock(&notes->lock);
 124                 pr_err("Not enough memory for annotating '%s' symbol!\n",
 125                        sym->name);
 126                 sleep(1);
 127                 return err;
 128         }
 129
 130         err = symbol__annotate(sym, map, 0);
 131         if (err == 0) {
 132 out_assign:
 133                 top->sym_filter_entry = he;
 134         }
 135
 136         pthread_mutex_unlock(&notes->lock);
 137         return err;
 138 }
 139
 140 static void __zero_source_counters(struct hist_entry *he)
 141 {
 142         struct symbol *sym = he->ms.sym;
 143         symbol__annotate_zero_histograms(sym);
 144 }
 145
 146 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
 147 {
 148         struct utsname uts;
 149         int err = uname(&uts);
 150
 151         ui__warning("Out of bounds address found:\n\n"
 152                     "Addr:   %" PRIx64 "\n"
 153                     "DSO:    %s %c\n"
 154                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
 155                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
 156                     "Arch:   %s\n"
 157                     "Kernel: %s\n"
 158                     "Tools:  %s\n\n"
 159                     "Not all samples will be on the annotation output.\n\n"
 160                     "Please report to linux-kernel@vger.kernel.org\n",
 161                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
 162                     map->start, map->end, sym->start, sym->end,
 163                     sym->binding == STB_GLOBAL ? 'g' :
 164                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
 165                     err ? "[unknown]" : uts.machine,
 166                     err ? "[unknown]" : uts.release, perf_version_string);
 167         if (use_browser <= 0)
 168                 sleep(5);
 169
 170         map->erange_warned = true;
 171 }
 172
 173 static void perf_top__record_precise_ip(struct perf_top *top,
 174                                         struct hist_entry *he,
 175                                         int counter, u64 ip)
 176 {
 177         struct annotation *notes;
 178         struct symbol *sym = he->ms.sym;
 179         int err = 0;
 180
 181         if (sym == NULL || (use_browser == 0 &&
 182                             (top->sym_filter_entry == NULL ||
 183                              top->sym_filter_entry->ms.sym != sym)))
 184                 return;
 185
 186         notes = symbol__annotation(sym);
 187
 188         if (pthread_mutex_trylock(&notes->lock))
 189                 return;
 190
 191         err = hist_entry__inc_addr_samples(he, counter, ip);
 192
 193         pthread_mutex_unlock(&notes->lock);
 194
 195         if (unlikely(err)) {
 196                 /*
 197                  * This function is now called with he->hists->lock held.
 198                  * Release it before going to sleep.
 199                  */
 200                 pthread_mutex_unlock(&he->hists->lock);
 201
 202                 if (err == -ERANGE && !he->ms.map->erange_warned)
 203                         ui__warn_map_erange(he->ms.map, sym, ip);
 204                 else if (err == -ENOMEM) {
 205                         pr_err("Not enough memory for annotating '%s' symbol!\n",
 206                                sym->name);
 207                         sleep(1);
 208                 }
 209
 210                 pthread_mutex_lock(&he->hists->lock);
 211         }
 212 }
 213
 214 static void perf_top__show_details(struct perf_top *top)
 215 {
 216         struct hist_entry *he = top->sym_filter_entry;
 217         struct annotation *notes;
 218         struct symbol *symbol;
 219         int more;
 220
 221         if (!he)
 222                 return;
 223
 224         symbol = he->ms.sym;
 225         notes = symbol__annotation(symbol);
 226
 227         pthread_mutex_lock(&notes->lock);
 228
 229         if (notes->src == NULL)
 230                 goto out_unlock;
 231
 232         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
 233         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
 234
 235         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel,
 236                                        0, top->sym_pcnt_filter, top->print_entries, 4);
 237
 238         if (top->evlist->enabled) {
 239                 if (top->zero)
 240                         symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
 241                 else
 242                         symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
 243         }
 244         if (more != 0)
 245                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 246 out_unlock:
 247         pthread_mutex_unlock(&notes->lock);
 248 }
 249
 250 static void perf_top__print_sym_table(struct perf_top *top)
 251 {
 252         char bf[160];
 253         int printed = 0;
 254         const int win_width = top->winsize.ws_col - 1;
 255         struct hists *hists = evsel__hists(top->sym_evsel);
 256
 257         puts(CONSOLE_CLEAR);
 258
 259         perf_top__header_snprintf(top, bf, sizeof(bf));
 260         printf("%s\n", bf);
 261
 262         perf_top__reset_sample_counters(top);
 263
 264         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 265
 266         if (hists->stats.nr_lost_warned !=
 267             hists->stats.nr_events[PERF_RECORD_LOST]) {
 268                 hists->stats.nr_lost_warned =
 269                               hists->stats.nr_events[PERF_RECORD_LOST];
 270                 color_fprintf(stdout, PERF_COLOR_RED,
 271                               "WARNING: LOST %d chunks, Check IO/CPU overload",
 272                               hists->stats.nr_lost_warned);
 273                 ++printed;
 274         }
 275
 276         if (top->sym_filter_entry) {
 277                 perf_top__show_details(top);
 278                 return;
 279         }
 280
 281         if (top->evlist->enabled) {
 282                 if (top->zero) {
 283                         hists__delete_entries(hists);
 284                 } else {
 285                         hists__decay_entries(hists, top->hide_user_symbols,
 286                                              top->hide_kernel_symbols);
 287                 }
 288         }
 289
 290         hists__collapse_resort(hists, NULL);
 291         hists__output_resort(hists, NULL);
 292
 293         hists__output_recalc_col_len(hists, top->print_entries - printed);
 294         putchar('\n');
 295         hists__fprintf(hists, false, top->print_entries - printed, win_width,
 296                        top->min_percent, stdout);
 297 }
 298
 299 static void prompt_integer(int *target, const char *msg)
 300 {
 301         char *buf = malloc(0), *p;
 302         size_t dummy = 0;
 303         int tmp;
 304
 305         fprintf(stdout, "\n%s: ", msg);
 306         if (getline(&buf, &dummy, stdin) < 0)
 307                 return;
 308
 309         p = strchr(buf, '\n');
 310         if (p)
 311                 *p = 0;
 312
 313         p = buf;
 314         while(*p) {
 315                 if (!isdigit(*p))
 316                         goto out_free;
 317                 p++;
 318         }
 319         tmp = strtoul(buf, NULL, 10);
 320         *target = tmp;
 321 out_free:
 322         free(buf);
 323 }
 324
 325 static void prompt_percent(int *target, const char *msg)
 326 {
 327         int tmp = 0;
 328
 329         prompt_integer(&tmp, msg);
 330         if (tmp >= 0 && tmp <= 100)
 331                 *target = tmp;
 332 }
 333
 334 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 335 {
 336         char *buf = malloc(0), *p;
 337         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
 338         struct hists *hists = evsel__hists(top->sym_evsel);
 339         struct rb_node *next;
 340         size_t dummy = 0;
 341
 342         /* zero counters of active symbol */
 343         if (syme) {
 344                 __zero_source_counters(syme);
 345                 top->sym_filter_entry = NULL;
 346         }
 347
 348         fprintf(stdout, "\n%s: ", msg);
 349         if (getline(&buf, &dummy, stdin) < 0)
 350                 goto out_free;
 351
 352         p = strchr(buf, '\n');
 353         if (p)
 354                 *p = 0;
 355
 356         next = rb_first(&hists->entries);
 357         while (next) {
 358                 n = rb_entry(next, struct hist_entry, rb_node);
 359                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
 360                         found = n;
 361                         break;
 362                 }
 363                 next = rb_next(&n->rb_node);
 364         }
 365
 366         if (!found) {
 367                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
 368                 sleep(1);
 369         } else
 370                 perf_top__parse_source(top, found);
 371
 372 out_free:
 373         free(buf);
 374 }
 375
 376 static void perf_top__print_mapped_keys(struct perf_top *top)
 377 {
 378         char *name = NULL;
 379
 380         if (top->sym_filter_entry) {
 381                 struct symbol *sym = top->sym_filter_entry->ms.sym;
 382                 name = sym->name;
 383         }
 384
 385         fprintf(stdout, "\nMapped keys:\n");
 386         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
 387         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
 388
 389         if (top->evlist->nr_entries > 1)
 390                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
 391
 392         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
 393
 394         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
 395         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 396         fprintf(stdout, "\t[S]     stop annotation.\n");
 397
 398         fprintf(stdout,
 399                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
 400                 top->hide_kernel_symbols ? "yes" : "no");
 401         fprintf(stdout,
 402                 "\t[U]     hide user symbols.               \t(%s)\n",
 403                 top->hide_user_symbols ? "yes" : "no");
 404         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
 405         fprintf(stdout, "\t[qQ]    quit.\n");
 406 }
 407
 408 static int perf_top__key_mapped(struct perf_top *top, int c)
 409 {
 410         switch (c) {
 411                 case 'd':
 412                 case 'e':
 413                 case 'f':
 414                 case 'z':
 415                 case 'q':
 416                 case 'Q':
 417                 case 'K':
 418                 case 'U':
 419                 case 'F':
 420                 case 's':
 421                 case 'S':
 422                         return 1;
 423                 case 'E':
 424                         return top->evlist->nr_entries > 1 ? 1 : 0;
 425                 default:
 426                         break;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static bool perf_top__handle_keypress(struct perf_top *top, int c)
 433 {
 434         bool ret = true;
 435
 436         if (!perf_top__key_mapped(top, c)) {
 437                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 438                 struct termios save;
 439
 440                 perf_top__print_mapped_keys(top);
 441                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 442                 fflush(stdout);
 443
 444                 set_term_quiet_input(&save);
 445
 446                 poll(&stdin_poll, 1, -1);
 447                 c = getc(stdin);
 448
 449                 tcsetattr(0, TCSAFLUSH, &save);
 450                 if (!perf_top__key_mapped(top, c))
 451                         return ret;
 452         }
 453
 454         switch (c) {
 455                 case 'd':
 456                         prompt_integer(&top->delay_secs, "Enter display delay");
 457                         if (top->delay_secs < 1)
 458                                 top->delay_secs = 1;
 459                         break;
 460                 case 'e':
 461                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
 462                         if (top->print_entries == 0) {
 463                                 struct sigaction act = {
 464                                         .sa_sigaction = perf_top__sig_winch,
 465                                         .sa_flags     = SA_SIGINFO,
 466                                 };
 467                                 perf_top__sig_winch(SIGWINCH, NULL, top);
 468                                 sigaction(SIGWINCH, &act, NULL);
 469                         } else {
 470                                 signal(SIGWINCH, SIG_DFL);
 471                         }
 472                         break;
 473                 case 'E':
 474                         if (top->evlist->nr_entries > 1) {
 475                                 /* Select 0 as the default event: */
 476                                 int counter = 0;
 477
 478                                 fprintf(stderr, "\nAvailable events:");
 479
 480                                 evlist__for_each(top->evlist, top->sym_evsel)
 481                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
 482
 483                                 prompt_integer(&counter, "Enter details event counter");
 484
 485                                 if (counter >= top->evlist->nr_entries) {
 486                                         top->sym_evsel = perf_evlist__first(top->evlist);
 487                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
 488                                         sleep(1);
 489                                         break;
 490                                 }
 491                                 evlist__for_each(top->evlist, top->sym_evsel)
 492                                         if (top->sym_evsel->idx == counter)
 493                                                 break;
 494                         } else
 495                                 top->sym_evsel = perf_evlist__first(top->evlist);
 496                         break;
 497                 case 'f':
 498                         prompt_integer(&top->count_filter, "Enter display event count filter");
 499                         break;
 500                 case 'F':
 501                         prompt_percent(&top->sym_pcnt_filter,
 502                                        "Enter details display event filter (percent)");
 503                         break;
 504                 case 'K':
 505                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
 506                         break;
 507                 case 'q':
 508                 case 'Q':
 509                         printf("exiting.\n");
 510                         if (top->dump_symtab)
 511                                 perf_session__fprintf_dsos(top->session, stderr);
 512                         ret = false;
 513                         break;
 514                 case 's':
 515                         perf_top__prompt_symbol(top, "Enter details symbol");
 516                         break;
 517                 case 'S':
 518                         if (!top->sym_filter_entry)
 519                                 break;
 520                         else {
 521                                 struct hist_entry *syme = top->sym_filter_entry;
 522
 523                                 top->sym_filter_entry = NULL;
 524                                 __zero_source_counters(syme);
 525                         }
 526                         break;
 527                 case 'U':
 528                         top->hide_user_symbols = !top->hide_user_symbols;
 529                         break;
 530                 case 'z':
 531                         top->zero = !top->zero;
 532                         break;
 533                 default:
 534                         break;
 535         }
 536
 537         return ret;
 538 }
 539
 540 static void perf_top__sort_new_samples(void *arg)
 541 {
 542         struct perf_top *t = arg;
 543         struct hists *hists;
 544
 545         perf_top__reset_sample_counters(t);
 546
 547         if (t->evlist->selected != NULL)
 548                 t->sym_evsel = t->evlist->selected;
 549
 550         hists = evsel__hists(t->sym_evsel);
 551
 552         if (t->evlist->enabled) {
 553                 if (t->zero) {
 554                         hists__delete_entries(hists);
 555                 } else {
 556                         hists__decay_entries(hists, t->hide_user_symbols,
 557                                              t->hide_kernel_symbols);
 558                 }
 559         }
 560
 561         hists__collapse_resort(hists, NULL);
 562         hists__output_resort(hists, NULL);
 563 }
 564
 565 static void *display_thread_tui(void *arg)
 566 {
 567         struct perf_evsel *pos;
 568         struct perf_top *top = arg;
 569         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
 570         struct hist_browser_timer hbt = {
 571                 .timer          = perf_top__sort_new_samples,
 572                 .arg            = top,
 573                 .refresh        = top->delay_secs,
 574         };
 575
 576         perf_top__sort_new_samples(top);
 577
 578         /*
 579          * Initialize the uid_filter_str, in the future the TUI will allow
 580          * Zooming in/out UIDs. For now juse use whatever the user passed
 581          * via --uid.
 582          */
 583         evlist__for_each(top->evlist, pos) {
 584                 struct hists *hists = evsel__hists(pos);
 585                 hists->uid_filter_str = top->record_opts.target.uid_str;
 586         }
 587
 588         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
 589                                       top->min_percent,
 590                                       &top->session->header.env);
 591
 592         done = 1;
 593         return NULL;
 594 }
 595
 596 static void display_sig(int sig __maybe_unused)
 597 {
 598         done = 1;
 599 }
 600
 601 static void display_setup_sig(void)
 602 {
 603         signal(SIGSEGV, sighandler_dump_stack);
 604         signal(SIGFPE, sighandler_dump_stack);
 605         signal(SIGINT,  display_sig);
 606         signal(SIGQUIT, display_sig);
 607         signal(SIGTERM, display_sig);
 608 }
 609
 610 static void *display_thread(void *arg)
 611 {
 612         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 613         struct termios save;
 614         struct perf_top *top = arg;
 615         int delay_msecs, c;
 616
 617         display_setup_sig();
 618         pthread__unblock_sigwinch();
 619 repeat:
 620         delay_msecs = top->delay_secs * 1000;
 621         set_term_quiet_input(&save);
 622         /* trash return*/
 623         getc(stdin);
 624
 625         while (!done) {
 626                 perf_top__print_sym_table(top);
 627                 /*
 628                  * Either timeout expired or we got an EINTR due to SIGWINCH,
 629                  * refresh screen in both cases.
 630                  */
 631                 switch (poll(&stdin_poll, 1, delay_msecs)) {
 632                 case 0:
 633                         continue;
 634                 case -1:
 635                         if (errno == EINTR)
 636                                 continue;
 637                         /* Fall trhu */
 638                 default:
 639                         c = getc(stdin);
 640                         tcsetattr(0, TCSAFLUSH, &save);
 641
 642                         if (perf_top__handle_keypress(top, c))
 643                                 goto repeat;
 644                         done = 1;
 645                 }
 646         }
 647
 648         tcsetattr(0, TCSAFLUSH, &save);
 649         return NULL;
 650 }
 651
 652 static int symbol_filter(struct map *map, struct symbol *sym)
 653 {
 654         const char *name = sym->name;
 655
 656         if (!__map__is_kernel(map))
 657                 return 0;
 658         /*
 659          * ppc64 uses function descriptors and appends a '.' to the
 660          * start of every instruction address. Remove it.
 661          */
 662         if (name[0] == '.')
 663                 name++;
 664
 665         if (!strcmp(name, "_text") ||
 666             !strcmp(name, "_etext") ||
 667             !strcmp(name, "_sinittext") ||
 668             !strncmp("init_module", name, 11) ||
 669             !strncmp("cleanup_module", name, 14) ||
 670             strstr(name, "_text_start") ||
 671             strstr(name, "_text_end"))
 672                 return 1;
 673
 674         if (symbol__is_idle(sym))
 675                 sym->ignore = true;
 676
 677         return 0;
 678 }
 679
 680 static int hist_iter__top_callback(struct hist_entry_iter *iter,
 681                                    struct addr_location *al, bool single,
 682                                    void *arg)
 683 {
 684         struct perf_top *top = arg;
 685         struct hist_entry *he = iter->he;
 686         struct perf_evsel *evsel = iter->evsel;
 687
 688         if (sort__has_sym && single)
 689                 perf_top__record_precise_ip(top, he, evsel->idx, al->addr);
 690
 691         hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
 692                      !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
 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 addr_location al;
 704         int err;
 705
 706         if (!machine && perf_guest) {
 707                 static struct intlist *seen;
 708
 709                 if (!seen)
 710                         seen = intlist__new(NULL);
 711
 712                 if (!intlist__has_entry(seen, sample->pid)) {
 713                         pr_err("Can't find guest [%d]'s kernel information\n",
 714                                 sample->pid);
 715                         intlist__add(seen, sample->pid);
 716                 }
 717                 return;
 718         }
 719
 720         if (!machine) {
 721                 pr_err("%u unprocessable samples recorded.\r",
 722                        top->session->evlist->stats.nr_unprocessable_samples++);
 723                 return;
 724         }
 725
 726         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
 727                 top->exact_samples++;
 728
 729         if (perf_event__preprocess_sample(event, machine, &al, sample) < 0)
 730                 return;
 731
 732         if (!top->kptr_restrict_warned &&
 733             symbol_conf.kptr_restrict &&
 734             al.cpumode == PERF_RECORD_MISC_KERNEL) {
 735                 ui__warning(
 736 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
 737 "Check /proc/sys/kernel/kptr_restrict.\n\n"
 738 "Kernel%s samples will not be resolved.\n",
 739                           al.map && !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
 740                           " modules" : "");
 741                 if (use_browser <= 0)
 742                         sleep(5);
 743                 top->kptr_restrict_warned = true;
 744         }
 745
 746         if (al.sym == NULL) {
 747                 const char *msg = "Kernel samples will not be resolved.\n";
 748                 /*
 749                  * As we do lazy loading of symtabs we only will know if the
 750                  * specified vmlinux file is invalid when we actually have a
 751                  * hit in kernel space and then try to load it. So if we get
 752                  * here and there are _no_ symbols in the DSO backing the
 753                  * kernel map, bail out.
 754                  *
 755                  * We may never get here, for instance, if we use -K/
 756                  * --hide-kernel-symbols, even if the user specifies an
 757                  * invalid --vmlinux ;-)
 758                  */
 759                 if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
 760                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 761                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 762                         if (symbol_conf.vmlinux_name) {
 763                                 char serr[256];
 764                                 dso__strerror_load(al.map->dso, serr, sizeof(serr));
 765                                 ui__warning("The %s file can't be used: %s\n%s",
 766                                             symbol_conf.vmlinux_name, serr, msg);
 767                         } else {
 768                                 ui__warning("A vmlinux file was not found.\n%s",
 769                                             msg);
 770                         }
 771
 772                         if (use_browser <= 0)
 773                                 sleep(5);
 774                         top->vmlinux_warned = true;
 775                 }
 776         }
 777
 778         if (al.sym == NULL || !al.sym->ignore) {
 779                 struct hists *hists = evsel__hists(evsel);
 780                 struct hist_entry_iter iter = {
 781                         .evsel          = evsel,
 782                         .sample         = sample,
 783                         .add_entry_cb   = hist_iter__top_callback,
 784                 };
 785
 786                 if (symbol_conf.cumulate_callchain)
 787                         iter.ops = &hist_iter_cumulative;
 788                 else
 789                         iter.ops = &hist_iter_normal;
 790
 791                 pthread_mutex_lock(&hists->lock);
 792
 793                 err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
 794                 if (err < 0)
 795                         pr_err("Problem incrementing symbol period, skipping event\n");
 796
 797                 pthread_mutex_unlock(&hists->lock);
 798         }
 799
 800         addr_location__put(&al);
 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_evlist__parse_sample(top->evlist, event, &sample);
 815                 if (ret) {
 816                         pr_err("Can't parse sample, err = %d\n", ret);
 817                         goto next_event;
 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                                 goto next_event;
 833                         machine = &session->machines.host;
 834                         break;
 835                 case PERF_RECORD_MISC_KERNEL:
 836                         ++top->kernel_samples;
 837                         if (top->hide_kernel_symbols)
 838                                 goto next_event;
 839                         machine = &session->machines.host;
 840                         break;
 841                 case PERF_RECORD_MISC_GUEST_KERNEL:
 842                         ++top->guest_kernel_samples;
 843                         machine = perf_session__find_machine(session,
 844                                                              sample.pid);
 845                         break;
 846                 case PERF_RECORD_MISC_GUEST_USER:
 847                         ++top->guest_us_samples;
 848                         /*
 849                          * TODO: we don't process guest user from host side
 850                          * except simple counting.
 851                          */
 852                         goto next_event;
 853                 default:
 854                         if (event->header.type == PERF_RECORD_SAMPLE)
 855                                 goto next_event;
 856                         machine = &session->machines.host;
 857                         break;
 858                 }
 859
 860
 861                 if (event->header.type == PERF_RECORD_SAMPLE) {
 862                         perf_event__process_sample(&top->tool, event, evsel,
 863                                                    &sample, machine);
 864                 } else if (event->header.type < PERF_RECORD_MAX) {
 865                         hists__inc_nr_events(evsel__hists(evsel), event->header.type);
 866                         machine__process_event(machine, event, &sample);
 867                 } else
 868                         ++session->evlist->stats.nr_unknown_events;
 869 next_event:
 870                 perf_evlist__mmap_consume(top->evlist, idx);
 871         }
 872 }
 873
 874 static void perf_top__mmap_read(struct perf_top *top)
 875 {
 876         int i;
 877
 878         for (i = 0; i < top->evlist->nr_mmaps; i++)
 879                 perf_top__mmap_read_idx(top, i);
 880 }
 881
 882 static int perf_top__start_counters(struct perf_top *top)
 883 {
 884         char msg[512];
 885         struct perf_evsel *counter;
 886         struct perf_evlist *evlist = top->evlist;
 887         struct record_opts *opts = &top->record_opts;
 888
 889         perf_evlist__config(evlist, opts);
 890
 891         evlist__for_each(evlist, counter) {
 892 try_again:
 893                 if (perf_evsel__open(counter, top->evlist->cpus,
 894                                      top->evlist->threads) < 0) {
 895                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
 896                                 if (verbose)
 897                                         ui__warning("%s\n", msg);
 898                                 goto try_again;
 899                         }
 900
 901                         perf_evsel__open_strerror(counter, &opts->target,
 902                                                   errno, msg, sizeof(msg));
 903                         ui__error("%s\n", msg);
 904                         goto out_err;
 905                 }
 906         }
 907
 908         if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
 909                 ui__error("Failed to mmap with %d (%s)\n",
 910                             errno, strerror_r(errno, msg, sizeof(msg)));
 911                 goto out_err;
 912         }
 913
 914         return 0;
 915
 916 out_err:
 917         return -1;
 918 }
 919
 920 static int perf_top__setup_sample_type(struct perf_top *top __maybe_unused)
 921 {
 922         if (!sort__has_sym) {
 923                 if (symbol_conf.use_callchain) {
 924                         ui__error("Selected -g but \"sym\" not present in --sort/-s.");
 925                         return -EINVAL;
 926                 }
 927         } else if (callchain_param.mode != CHAIN_NONE) {
 928                 if (callchain_register_param(&callchain_param) < 0) {
 929                         ui__error("Can't register callchain params.\n");
 930                         return -EINVAL;
 931                 }
 932         }
 933
 934         return 0;
 935 }
 936
 937 static int __cmd_top(struct perf_top *top)
 938 {
 939         struct record_opts *opts = &top->record_opts;
 940         pthread_t thread;
 941         int ret;
 942
 943         top->session = perf_session__new(NULL, false, NULL);
 944         if (top->session == NULL)
 945                 return -1;
 946
 947         machines__set_symbol_filter(&top->session->machines, symbol_filter);
 948
 949         if (!objdump_path) {
 950                 ret = perf_env__lookup_objdump(&top->session->header.env);
 951                 if (ret)
 952                         goto out_delete;
 953         }
 954
 955         ret = perf_top__setup_sample_type(top);
 956         if (ret)
 957                 goto out_delete;
 958
 959         if (perf_session__register_idle_thread(top->session) < 0)
 960                 goto out_delete;
 961
 962         machine__synthesize_threads(&top->session->machines.host, &opts->target,
 963                                     top->evlist->threads, false, opts->proc_map_timeout);
 964
 965         if (sort__has_socket) {
 966                 ret = perf_env__read_cpu_topology_map(&perf_env);
 967                 if (ret < 0)
 968                         goto out_err_cpu_topo;
 969         }
 970
 971         ret = perf_top__start_counters(top);
 972         if (ret)
 973                 goto out_delete;
 974
 975         top->session->evlist = top->evlist;
 976         perf_session__set_id_hdr_size(top->session);
 977
 978         /*
 979          * When perf is starting the traced process, all the events (apart from
 980          * group members) have enable_on_exec=1 set, so don't spoil it by
 981          * prematurely enabling them.
 982          *
 983          * XXX 'top' still doesn't start workloads like record, trace, but should,
 984          * so leave the check here.
 985          */
 986         if (!target__none(&opts->target))
 987                 perf_evlist__enable(top->evlist);
 988
 989         /* Wait for a minimal set of events before starting the snapshot */
 990         perf_evlist__poll(top->evlist, 100);
 991
 992         perf_top__mmap_read(top);
 993
 994         ret = -1;
 995         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
 996                                                             display_thread), top)) {
 997                 ui__error("Could not create display thread.\n");
 998                 goto out_delete;
 999         }
1000
1001         if (top->realtime_prio) {
1002                 struct sched_param param;
1003
1004                 param.sched_priority = top->realtime_prio;
1005                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1006                         ui__error("Could not set realtime priority.\n");
1007                         goto out_join;
1008                 }
1009         }
1010
1011         while (!done) {
1012                 u64 hits = top->samples;
1013
1014                 perf_top__mmap_read(top);
1015
1016                 if (hits == top->samples)
1017                         ret = perf_evlist__poll(top->evlist, 100);
1018         }
1019
1020         ret = 0;
1021 out_join:
1022         pthread_join(thread, NULL);
1023 out_delete:
1024         perf_session__delete(top->session);
1025         top->session = NULL;
1026
1027         return ret;
1028
1029 out_err_cpu_topo: {
1030         char errbuf[BUFSIZ];
1031         const char *err = strerror_r(-ret, errbuf, sizeof(errbuf));
1032
1033         ui__error("Could not read the CPU topology map: %s\n", err);
1034         goto out_delete;
1035 }
1036 }
1037
1038 static int
1039 callchain_opt(const struct option *opt, const char *arg, int unset)
1040 {
1041         symbol_conf.use_callchain = true;
1042         return record_callchain_opt(opt, arg, unset);
1043 }
1044
1045 static int
1046 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1047 {
1048         struct record_opts *record = (struct record_opts *)opt->value;
1049
1050         record->callgraph_set = true;
1051         callchain_param.enabled = !unset;
1052         callchain_param.record_mode = CALLCHAIN_FP;
1053
1054         /*
1055          * --no-call-graph
1056          */
1057         if (unset) {
1058                 symbol_conf.use_callchain = false;
1059                 callchain_param.record_mode = CALLCHAIN_NONE;
1060                 return 0;
1061         }
1062
1063         return parse_callchain_top_opt(arg);
1064 }
1065
1066 static int perf_top_config(const char *var, const char *value, void *cb)
1067 {
1068         if (!strcmp(var, "top.call-graph"))
1069                 var = "call-graph.record-mode"; /* fall-through */
1070         if (!strcmp(var, "top.children")) {
1071                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1072                 return 0;
1073         }
1074
1075         return perf_default_config(var, value, cb);
1076 }
1077
1078 static int
1079 parse_percent_limit(const struct option *opt, const char *arg,
1080                     int unset __maybe_unused)
1081 {
1082         struct perf_top *top = opt->value;
1083
1084         top->min_percent = strtof(arg, NULL);
1085         return 0;
1086 }
1087
1088 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1089         "\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1090
1091 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1092 {
1093         char errbuf[BUFSIZ];
1094         struct perf_top top = {
1095                 .count_filter        = 5,
1096                 .delay_secs          = 2,
1097                 .record_opts = {
1098                         .mmap_pages     = UINT_MAX,
1099                         .user_freq      = UINT_MAX,
1100                         .user_interval  = ULLONG_MAX,
1101                         .freq           = 4000, /* 4 KHz */
1102                         .target         = {
1103                                 .uses_mmap   = true,
1104                         },
1105                         .proc_map_timeout    = 500,
1106                 },
1107                 .max_stack           = PERF_MAX_STACK_DEPTH,
1108                 .sym_pcnt_filter     = 5,
1109         };
1110         struct record_opts *opts = &top.record_opts;
1111         struct target *target = &opts->target;
1112         const struct option options[] = {
1113         OPT_CALLBACK('e', "event", &top.evlist, "event",
1114                      "event selector. use 'perf list' to list available events",
1115                      parse_events_option),
1116         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1117         OPT_STRING('p', "pid", &target->pid, "pid",
1118                     "profile events on existing process id"),
1119         OPT_STRING('t', "tid", &target->tid, "tid",
1120                     "profile events on existing thread id"),
1121         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1122                             "system-wide collection from all CPUs"),
1123         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1124                     "list of cpus to monitor"),
1125         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1126                    "file", "vmlinux pathname"),
1127         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1128                     "don't load vmlinux even if found"),
1129         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1130                     "hide kernel symbols"),
1131         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1132                      "number of mmap data pages",
1133                      perf_evlist__parse_mmap_pages),
1134         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1135                     "collect data with this RT SCHED_FIFO priority"),
1136         OPT_INTEGER('d', "delay", &top.delay_secs,
1137                     "number of seconds to delay between refreshes"),
1138         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1139                             "dump the symbol table used for profiling"),
1140         OPT_INTEGER('f', "count-filter", &top.count_filter,
1141                     "only display functions with more events than this"),
1142         OPT_BOOLEAN(0, "group", &opts->group,
1143                             "put the counters into a counter group"),
1144         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1145                     "child tasks do not inherit counters"),
1146         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1147                     "symbol to annotate"),
1148         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1149         OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1150         OPT_INTEGER('E', "entries", &top.print_entries,
1151                     "display this many functions"),
1152         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1153                     "hide user symbols"),
1154         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1155         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1156         OPT_INCR('v', "verbose", &verbose,
1157                     "be more verbose (show counter open errors, etc)"),
1158         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1159                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1160                    " Please refer the man page for the complete list."),
1161         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1162                    "output field(s): overhead, period, sample plus all of sort keys"),
1163         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1164                     "Show a column with the number of samples"),
1165         OPT_CALLBACK_NOOPT('g', NULL, &top.record_opts,
1166                            NULL, "enables call-graph recording and display",
1167                            &callchain_opt),
1168         OPT_CALLBACK(0, "call-graph", &top.record_opts,
1169                      "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1170                      top_callchain_help, &parse_callchain_opt),
1171         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1172                     "Accumulate callchains of children and show total overhead as well"),
1173         OPT_INTEGER(0, "max-stack", &top.max_stack,
1174                     "Set the maximum stack depth when parsing the callchain. "
1175                     "Default: " __stringify(PERF_MAX_STACK_DEPTH)),
1176         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1177                    "ignore callees of these functions in call graphs",
1178                    report_parse_ignore_callees_opt),
1179         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1180                     "Show a column with the sum of periods"),
1181         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1182                    "only consider symbols in these dsos"),
1183         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1184                    "only consider symbols in these comms"),
1185         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1186                    "only consider these symbols"),
1187         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1188                     "Interleave source code with assembly code (default)"),
1189         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1190                     "Display raw encoding of assembly instructions (default)"),
1191         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1192                     "Enable kernel symbol demangling"),
1193         OPT_STRING(0, "objdump", &objdump_path, "path",
1194                     "objdump binary to use for disassembly and annotations"),
1195         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1196                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1197         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1198         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1199                      "Don't show entries under that percent", parse_percent_limit),
1200         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1201                      "How to display percentage of filtered entries", parse_filter_percentage),
1202         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1203                    "width[,width...]",
1204                    "don't try to adjust column width, use these fixed values"),
1205         OPT_UINTEGER(0, "proc-map-timeout", &opts->proc_map_timeout,
1206                         "per thread proc mmap processing timeout in ms"),
1207         OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1208                      "branch any", "sample any taken branches",
1209                      parse_branch_stack),
1210         OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1211                      "branch filter mask", "branch stack filter modes",
1212                      parse_branch_stack),
1213         OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1214                     "Show raw trace event output (do not use print fmt or plugins)"),
1215         OPT_END()
1216         };
1217         const char * const top_usage[] = {
1218                 "perf top [<options>]",
1219                 NULL
1220         };
1221         int status = hists__init();
1222
1223         if (status < 0)
1224                 return status;
1225
1226         top.evlist = perf_evlist__new();
1227         if (top.evlist == NULL)
1228                 return -ENOMEM;
1229
1230         perf_config(perf_top_config, &top);
1231
1232         argc = parse_options(argc, argv, options, top_usage, 0);
1233         if (argc)
1234                 usage_with_options(top_usage, options);
1235
1236         if (!top.evlist->nr_entries &&
1237             perf_evlist__add_default(top.evlist) < 0) {
1238                 pr_err("Not enough memory for event selector list\n");
1239                 goto out_delete_evlist;
1240         }
1241
1242         sort__mode = SORT_MODE__TOP;
1243         /* display thread wants entries to be collapsed in a different tree */
1244         sort__need_collapse = 1;
1245
1246         if (setup_sorting(top.evlist) < 0) {
1247                 if (sort_order)
1248                         parse_options_usage(top_usage, options, "s", 1);
1249                 if (field_order)
1250                         parse_options_usage(sort_order ? NULL : top_usage,
1251                                             options, "fields", 0);
1252                 goto out_delete_evlist;
1253         }
1254
1255         if (top.use_stdio)
1256                 use_browser = 0;
1257         else if (top.use_tui)
1258                 use_browser = 1;
1259
1260         setup_browser(false);
1261
1262         status = target__validate(target);
1263         if (status) {
1264                 target__strerror(target, status, errbuf, BUFSIZ);
1265                 ui__warning("%s\n", errbuf);
1266         }
1267
1268         status = target__parse_uid(target);
1269         if (status) {
1270                 int saved_errno = errno;
1271
1272                 target__strerror(target, status, errbuf, BUFSIZ);
1273                 ui__error("%s\n", errbuf);
1274
1275                 status = -saved_errno;
1276                 goto out_delete_evlist;
1277         }
1278
1279         if (target__none(target))
1280                 target->system_wide = true;
1281
1282         if (perf_evlist__create_maps(top.evlist, target) < 0) {
1283                 ui__error("Couldn't create thread/CPU maps: %s\n",
1284                           errno == ENOENT ? "No such process" : strerror_r(errno, errbuf, sizeof(errbuf)));
1285                 goto out_delete_evlist;
1286         }
1287
1288         symbol_conf.nr_events = top.evlist->nr_entries;
1289
1290         if (top.delay_secs < 1)
1291                 top.delay_secs = 1;
1292
1293         if (record_opts__config(opts)) {
1294                 status = -EINVAL;
1295                 goto out_delete_evlist;
1296         }
1297
1298         top.sym_evsel = perf_evlist__first(top.evlist);
1299
1300         if (!symbol_conf.use_callchain) {
1301                 symbol_conf.cumulate_callchain = false;
1302                 perf_hpp__cancel_cumulate();
1303         }
1304
1305         if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1306                 callchain_param.order = ORDER_CALLER;
1307
1308         symbol_conf.priv_size = sizeof(struct annotation);
1309
1310         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1311         if (symbol__init(NULL) < 0)
1312                 return -1;
1313
1314         sort__setup_elide(stdout);
1315
1316         get_term_dimensions(&top.winsize);
1317         if (top.print_entries == 0) {
1318                 struct sigaction act = {
1319                         .sa_sigaction = perf_top__sig_winch,
1320                         .sa_flags     = SA_SIGINFO,
1321                 };
1322                 perf_top__update_print_entries(&top);
1323                 sigaction(SIGWINCH, &act, NULL);
1324         }
1325
1326         status = __cmd_top(&top);
1327
1328 out_delete_evlist:
1329         perf_evlist__delete(top.evlist);
1330
1331         return status;
1332 }