linux/tools/perf/builtin-top.c
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   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#include "util/intlist.h"
  42
  43#include "util/debug.h"
  44
  45#include <assert.h>
  46#include <elf.h>
  47#include <fcntl.h>
  48
  49#include <stdio.h>
  50#include <termios.h>
  51#include <unistd.h>
  52#include <inttypes.h>
  53
  54#include <errno.h>
  55#include <time.h>
  56#include <sched.h>
  57
  58#include <sys/syscall.h>
  59#include <sys/ioctl.h>
  60#include <sys/poll.h>
  61#include <sys/prctl.h>
  62#include <sys/wait.h>
  63#include <sys/uio.h>
  64#include <sys/utsname.h>
  65#include <sys/mman.h>
  66
  67#include <linux/unistd.h>
  68#include <linux/types.h>
  69
  70void get_term_dimensions(struct winsize *ws)
  71{
  72        char *s = getenv("LINES");
  73
  74        if (s != NULL) {
  75                ws->ws_row = atoi(s);
  76                s = getenv("COLUMNS");
  77                if (s != NULL) {
  78                        ws->ws_col = atoi(s);
  79                        if (ws->ws_row && ws->ws_col)
  80                                return;
  81                }
  82        }
  83#ifdef TIOCGWINSZ
  84        if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
  85            ws->ws_row && ws->ws_col)
  86                return;
  87#endif
  88        ws->ws_row = 25;
  89        ws->ws_col = 80;
  90}
  91
  92static void perf_top__update_print_entries(struct perf_top *top)
  93{
  94        if (top->print_entries > 9)
  95                top->print_entries -= 9;
  96}
  97
  98static void perf_top__sig_winch(int sig __maybe_unused,
  99                                siginfo_t *info __maybe_unused, void *arg)
 100{
 101        struct perf_top *top = arg;
 102
 103        get_term_dimensions(&top->winsize);
 104        if (!top->print_entries
 105            || (top->print_entries+4) > top->winsize.ws_row) {
 106                top->print_entries = top->winsize.ws_row;
 107        } else {
 108                top->print_entries += 4;
 109                top->winsize.ws_row = top->print_entries;
 110        }
 111        perf_top__update_print_entries(top);
 112}
 113
 114static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 115{
 116        struct symbol *sym;
 117        struct annotation *notes;
 118        struct map *map;
 119        int err = -1;
 120
 121        if (!he || !he->ms.sym)
 122                return -1;
 123
 124        sym = he->ms.sym;
 125        map = he->ms.map;
 126
 127        /*
 128         * We can't annotate with just /proc/kallsyms
 129         */
 130        if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
 131                pr_err("Can't annotate %s: No vmlinux file was found in the "
 132                       "path\n", sym->name);
 133                sleep(1);
 134                return -1;
 135        }
 136
 137        notes = symbol__annotation(sym);
 138        if (notes->src != NULL) {
 139                pthread_mutex_lock(&notes->lock);
 140                goto out_assign;
 141        }
 142
 143        pthread_mutex_lock(&notes->lock);
 144
 145        if (symbol__alloc_hist(sym) < 0) {
 146                pthread_mutex_unlock(&notes->lock);
 147                pr_err("Not enough memory for annotating '%s' symbol!\n",
 148                       sym->name);
 149                sleep(1);
 150                return err;
 151        }
 152
 153        err = symbol__annotate(sym, map, 0);
 154        if (err == 0) {
 155out_assign:
 156                top->sym_filter_entry = he;
 157        }
 158
 159        pthread_mutex_unlock(&notes->lock);
 160        return err;
 161}
 162
 163static void __zero_source_counters(struct hist_entry *he)
 164{
 165        struct symbol *sym = he->ms.sym;
 166        symbol__annotate_zero_histograms(sym);
 167}
 168
 169static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
 170{
 171        struct utsname uts;
 172        int err = uname(&uts);
 173
 174        ui__warning("Out of bounds address found:\n\n"
 175                    "Addr:   %" PRIx64 "\n"
 176                    "DSO:    %s %c\n"
 177                    "Map:    %" PRIx64 "-%" PRIx64 "\n"
 178                    "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
 179                    "Arch:   %s\n"
 180                    "Kernel: %s\n"
 181                    "Tools:  %s\n\n"
 182                    "Not all samples will be on the annotation output.\n\n"
 183                    "Please report to linux-kernel@vger.kernel.org\n",
 184                    ip, map->dso->long_name, dso__symtab_origin(map->dso),
 185                    map->start, map->end, sym->start, sym->end,
 186                    sym->binding == STB_GLOBAL ? 'g' :
 187                    sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
 188                    err ? "[unknown]" : uts.machine,
 189                    err ? "[unknown]" : uts.release, perf_version_string);
 190        if (use_browser <= 0)
 191                sleep(5);
 192        
 193        map->erange_warned = true;
 194}
 195
 196static void perf_top__record_precise_ip(struct perf_top *top,
 197                                        struct hist_entry *he,
 198                                        int counter, u64 ip)
 199{
 200        struct annotation *notes;
 201        struct symbol *sym;
 202        int err;
 203
 204        if (he == NULL || he->ms.sym == NULL ||
 205            ((top->sym_filter_entry == NULL ||
 206              top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
 207                return;
 208
 209        sym = he->ms.sym;
 210        notes = symbol__annotation(sym);
 211
 212        if (pthread_mutex_trylock(&notes->lock))
 213                return;
 214
 215        if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
 216                pthread_mutex_unlock(&notes->lock);
 217                pr_err("Not enough memory for annotating '%s' symbol!\n",
 218                       sym->name);
 219                sleep(1);
 220                return;
 221        }
 222
 223        ip = he->ms.map->map_ip(he->ms.map, ip);
 224        err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
 225
 226        pthread_mutex_unlock(&notes->lock);
 227
 228        if (err == -ERANGE && !he->ms.map->erange_warned)
 229                ui__warn_map_erange(he->ms.map, sym, ip);
 230}
 231
 232static void perf_top__show_details(struct perf_top *top)
 233{
 234        struct hist_entry *he = top->sym_filter_entry;
 235        struct annotation *notes;
 236        struct symbol *symbol;
 237        int more;
 238
 239        if (!he)
 240                return;
 241
 242        symbol = he->ms.sym;
 243        notes = symbol__annotation(symbol);
 244
 245        pthread_mutex_lock(&notes->lock);
 246
 247        if (notes->src == NULL)
 248                goto out_unlock;
 249
 250        printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
 251        printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
 252
 253        more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel->idx,
 254                                       0, top->sym_pcnt_filter, top->print_entries, 4);
 255        if (top->zero)
 256                symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
 257        else
 258                symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
 259        if (more != 0)
 260                printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 261out_unlock:
 262        pthread_mutex_unlock(&notes->lock);
 263}
 264
 265static const char               CONSOLE_CLEAR[] = "";
 266
 267static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
 268                                                     struct addr_location *al,
 269                                                     struct perf_sample *sample)
 270{
 271        struct hist_entry *he;
 272
 273        he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
 274        if (he == NULL)
 275                return NULL;
 276
 277        hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
 278        return he;
 279}
 280
 281static void perf_top__print_sym_table(struct perf_top *top)
 282{
 283        char bf[160];
 284        int printed = 0;
 285        const int win_width = top->winsize.ws_col - 1;
 286
 287        puts(CONSOLE_CLEAR);
 288
 289        perf_top__header_snprintf(top, bf, sizeof(bf));
 290        printf("%s\n", bf);
 291
 292        perf_top__reset_sample_counters(top);
 293
 294        printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 295
 296        if (top->sym_evsel->hists.stats.nr_lost_warned !=
 297            top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
 298                top->sym_evsel->hists.stats.nr_lost_warned =
 299                        top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
 300                color_fprintf(stdout, PERF_COLOR_RED,
 301                              "WARNING: LOST %d chunks, Check IO/CPU overload",
 302                              top->sym_evsel->hists.stats.nr_lost_warned);
 303                ++printed;
 304        }
 305
 306        if (top->sym_filter_entry) {
 307                perf_top__show_details(top);
 308                return;
 309        }
 310
 311        hists__collapse_resort_threaded(&top->sym_evsel->hists);
 312        hists__output_resort_threaded(&top->sym_evsel->hists);
 313        hists__decay_entries_threaded(&top->sym_evsel->hists,
 314                                      top->hide_user_symbols,
 315                                      top->hide_kernel_symbols);
 316        hists__output_recalc_col_len(&top->sym_evsel->hists,
 317                                     top->winsize.ws_row - 3);
 318        putchar('\n');
 319        hists__fprintf(&top->sym_evsel->hists, false,
 320                       top->winsize.ws_row - 4 - printed, win_width, stdout);
 321}
 322
 323static void prompt_integer(int *target, const char *msg)
 324{
 325        char *buf = malloc(0), *p;
 326        size_t dummy = 0;
 327        int tmp;
 328
 329        fprintf(stdout, "\n%s: ", msg);
 330        if (getline(&buf, &dummy, stdin) < 0)
 331                return;
 332
 333        p = strchr(buf, '\n');
 334        if (p)
 335                *p = 0;
 336
 337        p = buf;
 338        while(*p) {
 339                if (!isdigit(*p))
 340                        goto out_free;
 341                p++;
 342        }
 343        tmp = strtoul(buf, NULL, 10);
 344        *target = tmp;
 345out_free:
 346        free(buf);
 347}
 348
 349static void prompt_percent(int *target, const char *msg)
 350{
 351        int tmp = 0;
 352
 353        prompt_integer(&tmp, msg);
 354        if (tmp >= 0 && tmp <= 100)
 355                *target = tmp;
 356}
 357
 358static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 359{
 360        char *buf = malloc(0), *p;
 361        struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
 362        struct rb_node *next;
 363        size_t dummy = 0;
 364
 365        /* zero counters of active symbol */
 366        if (syme) {
 367                __zero_source_counters(syme);
 368                top->sym_filter_entry = NULL;
 369        }
 370
 371        fprintf(stdout, "\n%s: ", msg);
 372        if (getline(&buf, &dummy, stdin) < 0)
 373                goto out_free;
 374
 375        p = strchr(buf, '\n');
 376        if (p)
 377                *p = 0;
 378
 379        next = rb_first(&top->sym_evsel->hists.entries);
 380        while (next) {
 381                n = rb_entry(next, struct hist_entry, rb_node);
 382                if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
 383                        found = n;
 384                        break;
 385                }
 386                next = rb_next(&n->rb_node);
 387        }
 388
 389        if (!found) {
 390                fprintf(stderr, "Sorry, %s is not active.\n", buf);
 391                sleep(1);
 392        } else
 393                perf_top__parse_source(top, found);
 394
 395out_free:
 396        free(buf);
 397}
 398
 399static void perf_top__print_mapped_keys(struct perf_top *top)
 400{
 401        char *name = NULL;
 402
 403        if (top->sym_filter_entry) {
 404                struct symbol *sym = top->sym_filter_entry->ms.sym;
 405                name = sym->name;
 406        }
 407
 408        fprintf(stdout, "\nMapped keys:\n");
 409        fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
 410        fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
 411
 412        if (top->evlist->nr_entries > 1)
 413                fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
 414
 415        fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
 416
 417        fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
 418        fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 419        fprintf(stdout, "\t[S]     stop annotation.\n");
 420
 421        fprintf(stdout,
 422                "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
 423                top->hide_kernel_symbols ? "yes" : "no");
 424        fprintf(stdout,
 425                "\t[U]     hide user symbols.               \t(%s)\n",
 426                top->hide_user_symbols ? "yes" : "no");
 427        fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
 428        fprintf(stdout, "\t[qQ]    quit.\n");
 429}
 430
 431static int perf_top__key_mapped(struct perf_top *top, int c)
 432{
 433        switch (c) {
 434                case 'd':
 435                case 'e':
 436                case 'f':
 437                case 'z':
 438                case 'q':
 439                case 'Q':
 440                case 'K':
 441                case 'U':
 442                case 'F':
 443                case 's':
 444                case 'S':
 445                        return 1;
 446                case 'E':
 447                        return top->evlist->nr_entries > 1 ? 1 : 0;
 448                default:
 449                        break;
 450        }
 451
 452        return 0;
 453}
 454
 455static void perf_top__handle_keypress(struct perf_top *top, int c)
 456{
 457        if (!perf_top__key_mapped(top, c)) {
 458                struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 459                struct termios tc, save;
 460
 461                perf_top__print_mapped_keys(top);
 462                fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 463                fflush(stdout);
 464
 465                tcgetattr(0, &save);
 466                tc = save;
 467                tc.c_lflag &= ~(ICANON | ECHO);
 468                tc.c_cc[VMIN] = 0;
 469                tc.c_cc[VTIME] = 0;
 470                tcsetattr(0, TCSANOW, &tc);
 471
 472                poll(&stdin_poll, 1, -1);
 473                c = getc(stdin);
 474
 475                tcsetattr(0, TCSAFLUSH, &save);
 476                if (!perf_top__key_mapped(top, c))
 477                        return;
 478        }
 479
 480        switch (c) {
 481                case 'd':
 482                        prompt_integer(&top->delay_secs, "Enter display delay");
 483                        if (top->delay_secs < 1)
 484                                top->delay_secs = 1;
 485                        break;
 486                case 'e':
 487                        prompt_integer(&top->print_entries, "Enter display entries (lines)");
 488                        if (top->print_entries == 0) {
 489                                struct sigaction act = {
 490                                        .sa_sigaction = perf_top__sig_winch,
 491                                        .sa_flags     = SA_SIGINFO,
 492                                };
 493                                perf_top__sig_winch(SIGWINCH, NULL, top);
 494                                sigaction(SIGWINCH, &act, NULL);
 495                        } else {
 496                                perf_top__sig_winch(SIGWINCH, NULL, top);
 497                                signal(SIGWINCH, SIG_DFL);
 498                        }
 499                        break;
 500                case 'E':
 501                        if (top->evlist->nr_entries > 1) {
 502                                /* Select 0 as the default event: */
 503                                int counter = 0;
 504
 505                                fprintf(stderr, "\nAvailable events:");
 506
 507                                list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 508                                        fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
 509
 510                                prompt_integer(&counter, "Enter details event counter");
 511
 512                                if (counter >= top->evlist->nr_entries) {
 513                                        top->sym_evsel = perf_evlist__first(top->evlist);
 514                                        fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
 515                                        sleep(1);
 516                                        break;
 517                                }
 518                                list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 519                                        if (top->sym_evsel->idx == counter)
 520                                                break;
 521                        } else
 522                                top->sym_evsel = perf_evlist__first(top->evlist);
 523                        break;
 524                case 'f':
 525                        prompt_integer(&top->count_filter, "Enter display event count filter");
 526                        break;
 527                case 'F':
 528                        prompt_percent(&top->sym_pcnt_filter,
 529                                       "Enter details display event filter (percent)");
 530                        break;
 531                case 'K':
 532                        top->hide_kernel_symbols = !top->hide_kernel_symbols;
 533                        break;
 534                case 'q':
 535                case 'Q':
 536                        printf("exiting.\n");
 537                        if (top->dump_symtab)
 538                                perf_session__fprintf_dsos(top->session, stderr);
 539                        exit(0);
 540                case 's':
 541                        perf_top__prompt_symbol(top, "Enter details symbol");
 542                        break;
 543                case 'S':
 544                        if (!top->sym_filter_entry)
 545                                break;
 546                        else {
 547                                struct hist_entry *syme = top->sym_filter_entry;
 548
 549                                top->sym_filter_entry = NULL;
 550                                __zero_source_counters(syme);
 551                        }
 552                        break;
 553                case 'U':
 554                        top->hide_user_symbols = !top->hide_user_symbols;
 555                        break;
 556                case 'z':
 557                        top->zero = !top->zero;
 558                        break;
 559                default:
 560                        break;
 561        }
 562}
 563
 564static void perf_top__sort_new_samples(void *arg)
 565{
 566        struct perf_top *t = arg;
 567        perf_top__reset_sample_counters(t);
 568
 569        if (t->evlist->selected != NULL)
 570                t->sym_evsel = t->evlist->selected;
 571
 572        hists__collapse_resort_threaded(&t->sym_evsel->hists);
 573        hists__output_resort_threaded(&t->sym_evsel->hists);
 574        hists__decay_entries_threaded(&t->sym_evsel->hists,
 575                                      t->hide_user_symbols,
 576                                      t->hide_kernel_symbols);
 577}
 578
 579static void *display_thread_tui(void *arg)
 580{
 581        struct perf_evsel *pos;
 582        struct perf_top *top = arg;
 583        const char *help = "For a higher level overview, try: perf top --sort comm,dso";
 584
 585        perf_top__sort_new_samples(top);
 586
 587        /*
 588         * Initialize the uid_filter_str, in the future the TUI will allow
 589         * Zooming in/out UIDs. For now juse use whatever the user passed
 590         * via --uid.
 591         */
 592        list_for_each_entry(pos, &top->evlist->entries, node)
 593                pos->hists.uid_filter_str = top->target.uid_str;
 594
 595        perf_evlist__tui_browse_hists(top->evlist, help,
 596                                      perf_top__sort_new_samples,
 597                                      top, top->delay_secs);
 598
 599        exit_browser(0);
 600        exit(0);
 601        return NULL;
 602}
 603
 604static void *display_thread(void *arg)
 605{
 606        struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 607        struct termios tc, save;
 608        struct perf_top *top = arg;
 609        int delay_msecs, c;
 610
 611        tcgetattr(0, &save);
 612        tc = save;
 613        tc.c_lflag &= ~(ICANON | ECHO);
 614        tc.c_cc[VMIN] = 0;
 615        tc.c_cc[VTIME] = 0;
 616
 617        pthread__unblock_sigwinch();
 618repeat:
 619        delay_msecs = top->delay_secs * 1000;
 620        tcsetattr(0, TCSANOW, &tc);
 621        /* trash return*/
 622        getc(stdin);
 623
 624        while (1) {
 625                perf_top__print_sym_table(top);
 626                /*
 627                 * Either timeout expired or we got an EINTR due to SIGWINCH,
 628                 * refresh screen in both cases.
 629                 */
 630                switch (poll(&stdin_poll, 1, delay_msecs)) {
 631                case 0:
 632                        continue;
 633                case -1:
 634                        if (errno == EINTR)
 635                                continue;
 636                        /* Fall trhu */
 637                default:
 638                        goto process_hotkey;
 639                }
 640        }
 641process_hotkey:
 642        c = getc(stdin);
 643        tcsetattr(0, TCSAFLUSH, &save);
 644
 645        perf_top__handle_keypress(top, c);
 646        goto repeat;
 647
 648        return NULL;
 649}
 650
 651/* Tag samples to be skipped. */
 652static const char *skip_symbols[] = {
 653        "intel_idle",
 654        "default_idle",
 655        "native_safe_halt",
 656        "cpu_idle",
 657        "enter_idle",
 658        "exit_idle",
 659        "mwait_idle",
 660        "mwait_idle_with_hints",
 661        "poll_idle",
 662        "ppc64_runlatch_off",
 663        "pseries_dedicated_idle_sleep",
 664        NULL
 665};
 666
 667static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
 668{
 669        const char *name = sym->name;
 670        int i;
 671
 672        /*
 673         * ppc64 uses function descriptors and appends a '.' to the
 674         * start of every instruction address. Remove it.
 675         */
 676        if (name[0] == '.')
 677                name++;
 678
 679        if (!strcmp(name, "_text") ||
 680            !strcmp(name, "_etext") ||
 681            !strcmp(name, "_sinittext") ||
 682            !strncmp("init_module", name, 11) ||
 683            !strncmp("cleanup_module", name, 14) ||
 684            strstr(name, "_text_start") ||
 685            strstr(name, "_text_end"))
 686                return 1;
 687
 688        for (i = 0; skip_symbols[i]; i++) {
 689                if (!strcmp(skip_symbols[i], name)) {
 690                        sym->ignore = true;
 691                        break;
 692                }
 693        }
 694
 695        return 0;
 696}
 697
 698static void perf_event__process_sample(struct perf_tool *tool,
 699                                       const union perf_event *event,
 700                                       struct perf_evsel *evsel,
 701                                       struct perf_sample *sample,
 702                                       struct machine *machine)
 703{
 704        struct perf_top *top = container_of(tool, struct perf_top, tool);
 705        struct symbol *parent = NULL;
 706        u64 ip = event->ip.ip;
 707        struct addr_location al;
 708        int err;
 709
 710        if (!machine && perf_guest) {
 711                static struct intlist *seen;
 712
 713                if (!seen)
 714                        seen = intlist__new();
 715
 716                if (!intlist__has_entry(seen, event->ip.pid)) {
 717                        pr_err("Can't find guest [%d]'s kernel information\n",
 718                                event->ip.pid);
 719                        intlist__add(seen, event->ip.pid);
 720                }
 721                return;
 722        }
 723
 724        if (!machine) {
 725                pr_err("%u unprocessable samples recorded.",
 726                       top->session->hists.stats.nr_unprocessable_samples++);
 727                return;
 728        }
 729
 730        if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
 731                top->exact_samples++;
 732
 733        if (perf_event__preprocess_sample(event, machine, &al, sample,
 734                                          symbol_filter) < 0 ||
 735            al.filtered)
 736                return;
 737
 738        if (!top->kptr_restrict_warned &&
 739            symbol_conf.kptr_restrict &&
 740            al.cpumode == PERF_RECORD_MISC_KERNEL) {
 741                ui__warning(
 742"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
 743"Check /proc/sys/kernel/kptr_restrict.\n\n"
 744"Kernel%s samples will not be resolved.\n",
 745                          !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
 746                          " modules" : "");
 747                if (use_browser <= 0)
 748                        sleep(5);
 749                top->kptr_restrict_warned = true;
 750        }
 751
 752        if (al.sym == NULL) {
 753                const char *msg = "Kernel samples will not be resolved.\n";
 754                /*
 755                 * As we do lazy loading of symtabs we only will know if the
 756                 * specified vmlinux file is invalid when we actually have a
 757                 * hit in kernel space and then try to load it. So if we get
 758                 * here and there are _no_ symbols in the DSO backing the
 759                 * kernel map, bail out.
 760                 *
 761                 * We may never get here, for instance, if we use -K/
 762                 * --hide-kernel-symbols, even if the user specifies an
 763                 * invalid --vmlinux ;-)
 764                 */
 765                if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
 766                    al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 767                    RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 768                        if (symbol_conf.vmlinux_name) {
 769                                ui__warning("The %s file can't be used.\n%s",
 770                                            symbol_conf.vmlinux_name, msg);
 771                        } else {
 772                                ui__warning("A vmlinux file was not found.\n%s",
 773                                            msg);
 774                        }
 775
 776                        if (use_browser <= 0)
 777                                sleep(5);
 778                        top->vmlinux_warned = true;
 779                }
 780        }
 781
 782        if (al.sym == NULL || !al.sym->ignore) {
 783                struct hist_entry *he;
 784
 785                if ((sort__has_parent || symbol_conf.use_callchain) &&
 786                    sample->callchain) {
 787                        err = machine__resolve_callchain(machine, evsel,
 788                                                         al.thread, sample,
 789                                                         &parent);
 790
 791                        if (err)
 792                                return;
 793                }
 794
 795                he = perf_evsel__add_hist_entry(evsel, &al, sample);
 796                if (he == NULL) {
 797                        pr_err("Problem incrementing symbol period, skipping event\n");
 798                        return;
 799                }
 800
 801                if (symbol_conf.use_callchain) {
 802                        err = callchain_append(he->callchain, &callchain_cursor,
 803                                               sample->period);
 804                        if (err)
 805                                return;
 806                }
 807
 808                if (top->sort_has_symbols)
 809                        perf_top__record_precise_ip(top, he, evsel->idx, ip);
 810        }
 811
 812        return;
 813}
 814
 815static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 816{
 817        struct perf_sample sample;
 818        struct perf_evsel *evsel;
 819        struct perf_session *session = top->session;
 820        union perf_event *event;
 821        struct machine *machine;
 822        u8 origin;
 823        int ret;
 824
 825        while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
 826                ret = perf_evlist__parse_sample(top->evlist, event, &sample);
 827                if (ret) {
 828                        pr_err("Can't parse sample, err = %d\n", ret);
 829                        continue;
 830                }
 831
 832                evsel = perf_evlist__id2evsel(session->evlist, sample.id);
 833                assert(evsel != NULL);
 834
 835                origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 836
 837                if (event->header.type == PERF_RECORD_SAMPLE)
 838                        ++top->samples;
 839
 840                switch (origin) {
 841                case PERF_RECORD_MISC_USER:
 842                        ++top->us_samples;
 843                        if (top->hide_user_symbols)
 844                                continue;
 845                        machine = perf_session__find_host_machine(session);
 846                        break;
 847                case PERF_RECORD_MISC_KERNEL:
 848                        ++top->kernel_samples;
 849                        if (top->hide_kernel_symbols)
 850                                continue;
 851                        machine = perf_session__find_host_machine(session);
 852                        break;
 853                case PERF_RECORD_MISC_GUEST_KERNEL:
 854                        ++top->guest_kernel_samples;
 855                        machine = perf_session__find_machine(session, event->ip.pid);
 856                        break;
 857                case PERF_RECORD_MISC_GUEST_USER:
 858                        ++top->guest_us_samples;
 859                        /*
 860                         * TODO: we don't process guest user from host side
 861                         * except simple counting.
 862                         */
 863                        /* Fall thru */
 864                default:
 865                        continue;
 866                }
 867
 868
 869                if (event->header.type == PERF_RECORD_SAMPLE) {
 870                        perf_event__process_sample(&top->tool, event, evsel,
 871                                                   &sample, machine);
 872                } else if (event->header.type < PERF_RECORD_MAX) {
 873                        hists__inc_nr_events(&evsel->hists, event->header.type);
 874                        perf_event__process(&top->tool, event, &sample, machine);
 875                } else
 876                        ++session->hists.stats.nr_unknown_events;
 877        }
 878}
 879
 880static void perf_top__mmap_read(struct perf_top *top)
 881{
 882        int i;
 883
 884        for (i = 0; i < top->evlist->nr_mmaps; i++)
 885                perf_top__mmap_read_idx(top, i);
 886}
 887
 888static void perf_top__start_counters(struct perf_top *top)
 889{
 890        struct perf_evsel *counter;
 891        struct perf_evlist *evlist = top->evlist;
 892
 893        if (top->group)
 894                perf_evlist__set_leader(evlist);
 895
 896        list_for_each_entry(counter, &evlist->entries, node) {
 897                struct perf_event_attr *attr = &counter->attr;
 898
 899                attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 900
 901                if (top->freq) {
 902                        attr->sample_type |= PERF_SAMPLE_PERIOD;
 903                        attr->freq        = 1;
 904                        attr->sample_freq = top->freq;
 905                }
 906
 907                if (evlist->nr_entries > 1) {
 908                        attr->sample_type |= PERF_SAMPLE_ID;
 909                        attr->read_format |= PERF_FORMAT_ID;
 910                }
 911
 912                if (perf_target__has_cpu(&top->target))
 913                        attr->sample_type |= PERF_SAMPLE_CPU;
 914
 915                if (symbol_conf.use_callchain)
 916                        attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
 917
 918                attr->mmap = 1;
 919                attr->comm = 1;
 920                attr->inherit = top->inherit;
 921fallback_missing_features:
 922                if (top->exclude_guest_missing)
 923                        attr->exclude_guest = attr->exclude_host = 0;
 924retry_sample_id:
 925                attr->sample_id_all = top->sample_id_all_missing ? 0 : 1;
 926try_again:
 927                if (perf_evsel__open(counter, top->evlist->cpus,
 928                                     top->evlist->threads) < 0) {
 929                        int err = errno;
 930
 931                        if (err == EPERM || err == EACCES) {
 932                                ui__error_paranoid();
 933                                goto out_err;
 934                        } else if (err == EINVAL) {
 935                                if (!top->exclude_guest_missing &&
 936                                    (attr->exclude_guest || attr->exclude_host)) {
 937                                        pr_debug("Old kernel, cannot exclude "
 938                                                 "guest or host samples.\n");
 939                                        top->exclude_guest_missing = true;
 940                                        goto fallback_missing_features;
 941                                } else if (!top->sample_id_all_missing) {
 942                                        /*
 943                                         * Old kernel, no attr->sample_id_type_all field
 944                                         */
 945                                        top->sample_id_all_missing = true;
 946                                        goto retry_sample_id;
 947                                }
 948                        }
 949                        /*
 950                         * If it's cycles then fall back to hrtimer
 951                         * based cpu-clock-tick sw counter, which
 952                         * is always available even if no PMU support:
 953                         */
 954                        if ((err == ENOENT || err == ENXIO) &&
 955                            (attr->type == PERF_TYPE_HARDWARE) &&
 956                            (attr->config == PERF_COUNT_HW_CPU_CYCLES)) {
 957
 958                                if (verbose)
 959                                        ui__warning("Cycles event not supported,\n"
 960                                                    "trying to fall back to cpu-clock-ticks\n");
 961
 962                                attr->type = PERF_TYPE_SOFTWARE;
 963                                attr->config = PERF_COUNT_SW_CPU_CLOCK;
 964                                if (counter->name) {
 965                                        free(counter->name);
 966                                        counter->name = NULL;
 967                                }
 968                                goto try_again;
 969                        }
 970
 971                        if (err == ENOENT) {
 972                                ui__error("The %s event is not supported.\n",
 973                                          perf_evsel__name(counter));
 974                                goto out_err;
 975                        } else if (err == EMFILE) {
 976                                ui__error("Too many events are opened.\n"
 977                                            "Try again after reducing the number of events\n");
 978                                goto out_err;
 979                        }
 980
 981                        ui__error("The sys_perf_event_open() syscall "
 982                                    "returned with %d (%s).  /bin/dmesg "
 983                                    "may provide additional information.\n"
 984                                    "No CONFIG_PERF_EVENTS=y kernel support "
 985                                    "configured?\n", err, strerror(err));
 986                        goto out_err;
 987                }
 988        }
 989
 990        if (perf_evlist__mmap(evlist, top->mmap_pages, false) < 0) {
 991                ui__error("Failed to mmap with %d (%s)\n",
 992                            errno, strerror(errno));
 993                goto out_err;
 994        }
 995
 996        return;
 997
 998out_err:
 999        exit_browser(0);
1000        exit(0);
1001}
1002
1003static int perf_top__setup_sample_type(struct perf_top *top)
1004{
1005        if (!top->sort_has_symbols) {
1006                if (symbol_conf.use_callchain) {
1007                        ui__error("Selected -g but \"sym\" not present in --sort/-s.");
1008                        return -EINVAL;
1009                }
1010        } else if (!top->dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
1011                if (callchain_register_param(&callchain_param) < 0) {
1012                        ui__error("Can't register callchain params.\n");
1013                        return -EINVAL;
1014                }
1015        }
1016
1017        return 0;
1018}
1019
1020static int __cmd_top(struct perf_top *top)
1021{
1022        pthread_t thread;
1023        int ret;
1024        /*
1025         * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
1026         * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
1027         */
1028        top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
1029        if (top->session == NULL)
1030                return -ENOMEM;
1031
1032        ret = perf_top__setup_sample_type(top);
1033        if (ret)
1034                goto out_delete;
1035
1036        if (perf_target__has_task(&top->target))
1037                perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
1038                                                  perf_event__process,
1039                                                  &top->session->host_machine);
1040        else
1041                perf_event__synthesize_threads(&top->tool, perf_event__process,
1042                                               &top->session->host_machine);
1043        perf_top__start_counters(top);
1044        top->session->evlist = top->evlist;
1045        perf_session__set_id_hdr_size(top->session);
1046
1047        /* Wait for a minimal set of events before starting the snapshot */
1048        poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1049
1050        perf_top__mmap_read(top);
1051
1052        if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1053                                                            display_thread), top)) {
1054                ui__error("Could not create display thread.\n");
1055                exit(-1);
1056        }
1057
1058        if (top->realtime_prio) {
1059                struct sched_param param;
1060
1061                param.sched_priority = top->realtime_prio;
1062                if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1063                        ui__error("Could not set realtime priority.\n");
1064                        exit(-1);
1065                }
1066        }
1067
1068        while (1) {
1069                u64 hits = top->samples;
1070
1071                perf_top__mmap_read(top);
1072
1073                if (hits == top->samples)
1074                        ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1075        }
1076
1077out_delete:
1078        perf_session__delete(top->session);
1079        top->session = NULL;
1080
1081        return 0;
1082}
1083
1084static int
1085parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1086{
1087        struct perf_top *top = (struct perf_top *)opt->value;
1088        char *tok, *tok2;
1089        char *endptr;
1090
1091        /*
1092         * --no-call-graph
1093         */
1094        if (unset) {
1095                top->dont_use_callchains = true;
1096                return 0;
1097        }
1098
1099        symbol_conf.use_callchain = true;
1100
1101        if (!arg)
1102                return 0;
1103
1104        tok = strtok((char *)arg, ",");
1105        if (!tok)
1106                return -1;
1107
1108        /* get the output mode */
1109        if (!strncmp(tok, "graph", strlen(arg)))
1110                callchain_param.mode = CHAIN_GRAPH_ABS;
1111
1112        else if (!strncmp(tok, "flat", strlen(arg)))
1113                callchain_param.mode = CHAIN_FLAT;
1114
1115        else if (!strncmp(tok, "fractal", strlen(arg)))
1116                callchain_param.mode = CHAIN_GRAPH_REL;
1117
1118        else if (!strncmp(tok, "none", strlen(arg))) {
1119                callchain_param.mode = CHAIN_NONE;
1120                symbol_conf.use_callchain = false;
1121
1122                return 0;
1123        } else
1124                return -1;
1125
1126        /* get the min percentage */
1127        tok = strtok(NULL, ",");
1128        if (!tok)
1129                goto setup;
1130
1131        callchain_param.min_percent = strtod(tok, &endptr);
1132        if (tok == endptr)
1133                return -1;
1134
1135        /* get the print limit */
1136        tok2 = strtok(NULL, ",");
1137        if (!tok2)
1138                goto setup;
1139
1140        if (tok2[0] != 'c') {
1141                callchain_param.print_limit = strtod(tok2, &endptr);
1142                tok2 = strtok(NULL, ",");
1143                if (!tok2)
1144                        goto setup;
1145        }
1146
1147        /* get the call chain order */
1148        if (!strcmp(tok2, "caller"))
1149                callchain_param.order = ORDER_CALLER;
1150        else if (!strcmp(tok2, "callee"))
1151                callchain_param.order = ORDER_CALLEE;
1152        else
1153                return -1;
1154setup:
1155        if (callchain_register_param(&callchain_param) < 0) {
1156                fprintf(stderr, "Can't register callchain params\n");
1157                return -1;
1158        }
1159        return 0;
1160}
1161
1162int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1163{
1164        struct perf_evsel *pos;
1165        int status;
1166        char errbuf[BUFSIZ];
1167        struct perf_top top = {
1168                .count_filter        = 5,
1169                .delay_secs          = 2,
1170                .freq                = 4000, /* 4 KHz */
1171                .mmap_pages          = 128,
1172                .sym_pcnt_filter     = 5,
1173                .target              = {
1174                        .uses_mmap   = true,
1175                },
1176        };
1177        char callchain_default_opt[] = "fractal,0.5,callee";
1178        const struct option options[] = {
1179        OPT_CALLBACK('e', "event", &top.evlist, "event",
1180                     "event selector. use 'perf list' to list available events",
1181                     parse_events_option),
1182        OPT_INTEGER('c', "count", &top.default_interval,
1183                    "event period to sample"),
1184        OPT_STRING('p', "pid", &top.target.pid, "pid",
1185                    "profile events on existing process id"),
1186        OPT_STRING('t', "tid", &top.target.tid, "tid",
1187                    "profile events on existing thread id"),
1188        OPT_BOOLEAN('a', "all-cpus", &top.target.system_wide,
1189                            "system-wide collection from all CPUs"),
1190        OPT_STRING('C', "cpu", &top.target.cpu_list, "cpu",
1191                    "list of cpus to monitor"),
1192        OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1193                   "file", "vmlinux pathname"),
1194        OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1195                    "hide kernel symbols"),
1196        OPT_UINTEGER('m', "mmap-pages", &top.mmap_pages, "number of mmap data pages"),
1197        OPT_INTEGER('r', "realtime", &top.realtime_prio,
1198                    "collect data with this RT SCHED_FIFO priority"),
1199        OPT_INTEGER('d', "delay", &top.delay_secs,
1200                    "number of seconds to delay between refreshes"),
1201        OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1202                            "dump the symbol table used for profiling"),
1203        OPT_INTEGER('f', "count-filter", &top.count_filter,
1204                    "only display functions with more events than this"),
1205        OPT_BOOLEAN('g', "group", &top.group,
1206                            "put the counters into a counter group"),
1207        OPT_BOOLEAN('i', "inherit", &top.inherit,
1208                    "child tasks inherit counters"),
1209        OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1210                    "symbol to annotate"),
1211        OPT_BOOLEAN('z', "zero", &top.zero,
1212                    "zero history across updates"),
1213        OPT_INTEGER('F', "freq", &top.freq,
1214                    "profile at this frequency"),
1215        OPT_INTEGER('E', "entries", &top.print_entries,
1216                    "display this many functions"),
1217        OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1218                    "hide user symbols"),
1219        OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1220        OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1221        OPT_INCR('v', "verbose", &verbose,
1222                    "be more verbose (show counter open errors, etc)"),
1223        OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1224                   "sort by key(s): pid, comm, dso, symbol, parent"),
1225        OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1226                    "Show a column with the number of samples"),
1227        OPT_CALLBACK_DEFAULT('G', "call-graph", &top, "output_type,min_percent, call_order",
1228                     "Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
1229                     "Default: fractal,0.5,callee", &parse_callchain_opt,
1230                     callchain_default_opt),
1231        OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1232                    "Show a column with the sum of periods"),
1233        OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1234                   "only consider symbols in these dsos"),
1235        OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1236                   "only consider symbols in these comms"),
1237        OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1238                   "only consider these symbols"),
1239        OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1240                    "Interleave source code with assembly code (default)"),
1241        OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1242                    "Display raw encoding of assembly instructions (default)"),
1243        OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1244                   "Specify disassembler style (e.g. -M intel for intel syntax)"),
1245        OPT_STRING('u', "uid", &top.target.uid_str, "user", "user to profile"),
1246        OPT_END()
1247        };
1248        const char * const top_usage[] = {
1249                "perf top [<options>]",
1250                NULL
1251        };
1252
1253        top.evlist = perf_evlist__new(NULL, NULL);
1254        if (top.evlist == NULL)
1255                return -ENOMEM;
1256
1257        symbol_conf.exclude_other = false;
1258
1259        argc = parse_options(argc, argv, options, top_usage, 0);
1260        if (argc)
1261                usage_with_options(top_usage, options);
1262
1263        if (sort_order == default_sort_order)
1264                sort_order = "dso,symbol";
1265
1266        setup_sorting(top_usage, options);
1267
1268        if (top.use_stdio)
1269                use_browser = 0;
1270        else if (top.use_tui)
1271                use_browser = 1;
1272
1273        setup_browser(false);
1274
1275        status = perf_target__validate(&top.target);
1276        if (status) {
1277                perf_target__strerror(&top.target, status, errbuf, BUFSIZ);
1278                ui__warning("%s", errbuf);
1279        }
1280
1281        status = perf_target__parse_uid(&top.target);
1282        if (status) {
1283                int saved_errno = errno;
1284
1285                perf_target__strerror(&top.target, status, errbuf, BUFSIZ);
1286                ui__error("%s", errbuf);
1287
1288                status = -saved_errno;
1289                goto out_delete_evlist;
1290        }
1291
1292        if (perf_target__none(&top.target))
1293                top.target.system_wide = true;
1294
1295        if (perf_evlist__create_maps(top.evlist, &top.target) < 0)
1296                usage_with_options(top_usage, options);
1297
1298        if (!top.evlist->nr_entries &&
1299            perf_evlist__add_default(top.evlist) < 0) {
1300                ui__error("Not enough memory for event selector list\n");
1301                return -ENOMEM;
1302        }
1303
1304        symbol_conf.nr_events = top.evlist->nr_entries;
1305
1306        if (top.delay_secs < 1)
1307                top.delay_secs = 1;
1308
1309        /*
1310         * User specified count overrides default frequency.
1311         */
1312        if (top.default_interval)
1313                top.freq = 0;
1314        else if (top.freq) {
1315                top.default_interval = top.freq;
1316        } else {
1317                ui__error("frequency and count are zero, aborting\n");
1318                exit(EXIT_FAILURE);
1319        }
1320
1321        list_for_each_entry(pos, &top.evlist->entries, node) {
1322                /*
1323                 * Fill in the ones not specifically initialized via -c:
1324                 */
1325                if (!pos->attr.sample_period)
1326                        pos->attr.sample_period = top.default_interval;
1327        }
1328
1329        top.sym_evsel = perf_evlist__first(top.evlist);
1330
1331        symbol_conf.priv_size = sizeof(struct annotation);
1332
1333        symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1334        if (symbol__init() < 0)
1335                return -1;
1336
1337        sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
1338        sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
1339        sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
1340
1341        /*
1342         * Avoid annotation data structures overhead when symbols aren't on the
1343         * sort list.
1344         */
1345        top.sort_has_symbols = sort_sym.list.next != NULL;
1346
1347        get_term_dimensions(&top.winsize);
1348        if (top.print_entries == 0) {
1349                struct sigaction act = {
1350                        .sa_sigaction = perf_top__sig_winch,
1351                        .sa_flags     = SA_SIGINFO,
1352                };
1353                perf_top__update_print_entries(&top);
1354                sigaction(SIGWINCH, &act, NULL);
1355        }
1356
1357        status = __cmd_top(&top);
1358
1359out_delete_evlist:
1360        perf_evlist__delete(top.evlist);
1361
1362        return status;
1363}
1364
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