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 __used, siginfo_t *info __used, void *arg)
  99{
 100        struct perf_top *top = arg;
 101
 102        get_term_dimensions(&top->winsize);
 103        if (!top->print_entries
 104            || (top->print_entries+4) > top->winsize.ws_row) {
 105                top->print_entries = top->winsize.ws_row;
 106        } else {
 107                top->print_entries += 4;
 108                top->winsize.ws_row = top->print_entries;
 109        }
 110        perf_top__update_print_entries(top);
 111}
 112
 113static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 114{
 115        struct symbol *sym;
 116        struct annotation *notes;
 117        struct map *map;
 118        int err = -1;
 119
 120        if (!he || !he->ms.sym)
 121                return -1;
 122
 123        sym = he->ms.sym;
 124        map = he->ms.map;
 125
 126        /*
 127         * We can't annotate with just /proc/kallsyms
 128         */
 129        if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
 130                pr_err("Can't annotate %s: No vmlinux file was found in the "
 131                       "path\n", sym->name);
 132                sleep(1);
 133                return -1;
 134        }
 135
 136        notes = symbol__annotation(sym);
 137        if (notes->src != NULL) {
 138                pthread_mutex_lock(&notes->lock);
 139                goto out_assign;
 140        }
 141
 142        pthread_mutex_lock(&notes->lock);
 143
 144        if (symbol__alloc_hist(sym) < 0) {
 145                pthread_mutex_unlock(&notes->lock);
 146                pr_err("Not enough memory for annotating '%s' symbol!\n",
 147                       sym->name);
 148                sleep(1);
 149                return err;
 150        }
 151
 152        err = symbol__annotate(sym, map, 0);
 153        if (err == 0) {
 154out_assign:
 155                top->sym_filter_entry = he;
 156        }
 157
 158        pthread_mutex_unlock(&notes->lock);
 159        return err;
 160}
 161
 162static void __zero_source_counters(struct hist_entry *he)
 163{
 164        struct symbol *sym = he->ms.sym;
 165        symbol__annotate_zero_histograms(sym);
 166}
 167
 168static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
 169{
 170        struct utsname uts;
 171        int err = uname(&uts);
 172
 173        ui__warning("Out of bounds address found:\n\n"
 174                    "Addr:   %" PRIx64 "\n"
 175                    "DSO:    %s %c\n"
 176                    "Map:    %" PRIx64 "-%" PRIx64 "\n"
 177                    "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
 178                    "Arch:   %s\n"
 179                    "Kernel: %s\n"
 180                    "Tools:  %s\n\n"
 181                    "Not all samples will be on the annotation output.\n\n"
 182                    "Please report to linux-kernel@vger.kernel.org\n",
 183                    ip, map->dso->long_name, dso__symtab_origin(map->dso),
 184                    map->start, map->end, sym->start, sym->end,
 185                    sym->binding == STB_GLOBAL ? 'g' :
 186                    sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
 187                    err ? "[unknown]" : uts.machine,
 188                    err ? "[unknown]" : uts.release, perf_version_string);
 189        if (use_browser <= 0)
 190                sleep(5);
 191        
 192        map->erange_warned = true;
 193}
 194
 195static void perf_top__record_precise_ip(struct perf_top *top,
 196                                        struct hist_entry *he,
 197                                        int counter, u64 ip)
 198{
 199        struct annotation *notes;
 200        struct symbol *sym;
 201        int err;
 202
 203        if (he == NULL || he->ms.sym == NULL ||
 204            ((top->sym_filter_entry == NULL ||
 205              top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
 206                return;
 207
 208        sym = he->ms.sym;
 209        notes = symbol__annotation(sym);
 210
 211        if (pthread_mutex_trylock(&notes->lock))
 212                return;
 213
 214        if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
 215                pthread_mutex_unlock(&notes->lock);
 216                pr_err("Not enough memory for annotating '%s' symbol!\n",
 217                       sym->name);
 218                sleep(1);
 219                return;
 220        }
 221
 222        ip = he->ms.map->map_ip(he->ms.map, ip);
 223        err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
 224
 225        pthread_mutex_unlock(&notes->lock);
 226
 227        if (err == -ERANGE && !he->ms.map->erange_warned)
 228                ui__warn_map_erange(he->ms.map, sym, ip);
 229}
 230
 231static void perf_top__show_details(struct perf_top *top)
 232{
 233        struct hist_entry *he = top->sym_filter_entry;
 234        struct annotation *notes;
 235        struct symbol *symbol;
 236        int more;
 237
 238        if (!he)
 239                return;
 240
 241        symbol = he->ms.sym;
 242        notes = symbol__annotation(symbol);
 243
 244        pthread_mutex_lock(&notes->lock);
 245
 246        if (notes->src == NULL)
 247                goto out_unlock;
 248
 249        printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
 250        printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
 251
 252        more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel->idx,
 253                                       0, top->sym_pcnt_filter, top->print_entries, 4);
 254        if (top->zero)
 255                symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
 256        else
 257                symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
 258        if (more != 0)
 259                printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 260out_unlock:
 261        pthread_mutex_unlock(&notes->lock);
 262}
 263
 264static const char               CONSOLE_CLEAR[] = "";
 265
 266static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
 267                                                     struct addr_location *al,
 268                                                     struct perf_sample *sample)
 269{
 270        struct hist_entry *he;
 271
 272        he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
 273        if (he == NULL)
 274                return NULL;
 275
 276        hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
 277        return he;
 278}
 279
 280static void perf_top__print_sym_table(struct perf_top *top)
 281{
 282        char bf[160];
 283        int printed = 0;
 284        const int win_width = top->winsize.ws_col - 1;
 285
 286        puts(CONSOLE_CLEAR);
 287
 288        perf_top__header_snprintf(top, bf, sizeof(bf));
 289        printf("%s\n", bf);
 290
 291        perf_top__reset_sample_counters(top);
 292
 293        printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 294
 295        if (top->sym_evsel->hists.stats.nr_lost_warned !=
 296            top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
 297                top->sym_evsel->hists.stats.nr_lost_warned =
 298                        top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
 299                color_fprintf(stdout, PERF_COLOR_RED,
 300                              "WARNING: LOST %d chunks, Check IO/CPU overload",
 301                              top->sym_evsel->hists.stats.nr_lost_warned);
 302                ++printed;
 303        }
 304
 305        if (top->sym_filter_entry) {
 306                perf_top__show_details(top);
 307                return;
 308        }
 309
 310        hists__collapse_resort_threaded(&top->sym_evsel->hists);
 311        hists__output_resort_threaded(&top->sym_evsel->hists);
 312        hists__decay_entries_threaded(&top->sym_evsel->hists,
 313                                      top->hide_user_symbols,
 314                                      top->hide_kernel_symbols);
 315        hists__output_recalc_col_len(&top->sym_evsel->hists,
 316                                     top->winsize.ws_row - 3);
 317        putchar('\n');
 318        hists__fprintf(&top->sym_evsel->hists, NULL, false, false,
 319                       top->winsize.ws_row - 4 - printed, win_width, stdout);
 320}
 321
 322static void prompt_integer(int *target, const char *msg)
 323{
 324        char *buf = malloc(0), *p;
 325        size_t dummy = 0;
 326        int tmp;
 327
 328        fprintf(stdout, "\n%s: ", msg);
 329        if (getline(&buf, &dummy, stdin) < 0)
 330                return;
 331
 332        p = strchr(buf, '\n');
 333        if (p)
 334                *p = 0;
 335
 336        p = buf;
 337        while(*p) {
 338                if (!isdigit(*p))
 339                        goto out_free;
 340                p++;
 341        }
 342        tmp = strtoul(buf, NULL, 10);
 343        *target = tmp;
 344out_free:
 345        free(buf);
 346}
 347
 348static void prompt_percent(int *target, const char *msg)
 349{
 350        int tmp = 0;
 351
 352        prompt_integer(&tmp, msg);
 353        if (tmp >= 0 && tmp <= 100)
 354                *target = tmp;
 355}
 356
 357static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 358{
 359        char *buf = malloc(0), *p;
 360        struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
 361        struct rb_node *next;
 362        size_t dummy = 0;
 363
 364        /* zero counters of active symbol */
 365        if (syme) {
 366                __zero_source_counters(syme);
 367                top->sym_filter_entry = NULL;
 368        }
 369
 370        fprintf(stdout, "\n%s: ", msg);
 371        if (getline(&buf, &dummy, stdin) < 0)
 372                goto out_free;
 373
 374        p = strchr(buf, '\n');
 375        if (p)
 376                *p = 0;
 377
 378        next = rb_first(&top->sym_evsel->hists.entries);
 379        while (next) {
 380                n = rb_entry(next, struct hist_entry, rb_node);
 381                if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
 382                        found = n;
 383                        break;
 384                }
 385                next = rb_next(&n->rb_node);
 386        }
 387
 388        if (!found) {
 389                fprintf(stderr, "Sorry, %s is not active.\n", buf);
 390                sleep(1);
 391        } else
 392                perf_top__parse_source(top, found);
 393
 394out_free:
 395        free(buf);
 396}
 397
 398static void perf_top__print_mapped_keys(struct perf_top *top)
 399{
 400        char *name = NULL;
 401
 402        if (top->sym_filter_entry) {
 403                struct symbol *sym = top->sym_filter_entry->ms.sym;
 404                name = sym->name;
 405        }
 406
 407        fprintf(stdout, "\nMapped keys:\n");
 408        fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
 409        fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
 410
 411        if (top->evlist->nr_entries > 1)
 412                fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
 413
 414        fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
 415
 416        fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
 417        fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 418        fprintf(stdout, "\t[S]     stop annotation.\n");
 419
 420        fprintf(stdout,
 421                "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
 422                top->hide_kernel_symbols ? "yes" : "no");
 423        fprintf(stdout,
 424                "\t[U]     hide user symbols.               \t(%s)\n",
 425                top->hide_user_symbols ? "yes" : "no");
 426        fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
 427        fprintf(stdout, "\t[qQ]    quit.\n");
 428}
 429
 430static int perf_top__key_mapped(struct perf_top *top, int c)
 431{
 432        switch (c) {
 433                case 'd':
 434                case 'e':
 435                case 'f':
 436                case 'z':
 437                case 'q':
 438                case 'Q':
 439                case 'K':
 440                case 'U':
 441                case 'F':
 442                case 's':
 443                case 'S':
 444                        return 1;
 445                case 'E':
 446                        return top->evlist->nr_entries > 1 ? 1 : 0;
 447                default:
 448                        break;
 449        }
 450
 451        return 0;
 452}
 453
 454static void perf_top__handle_keypress(struct perf_top *top, int c)
 455{
 456        if (!perf_top__key_mapped(top, c)) {
 457                struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 458                struct termios tc, save;
 459
 460                perf_top__print_mapped_keys(top);
 461                fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 462                fflush(stdout);
 463
 464                tcgetattr(0, &save);
 465                tc = save;
 466                tc.c_lflag &= ~(ICANON | ECHO);
 467                tc.c_cc[VMIN] = 0;
 468                tc.c_cc[VTIME] = 0;
 469                tcsetattr(0, TCSANOW, &tc);
 470
 471                poll(&stdin_poll, 1, -1);
 472                c = getc(stdin);
 473
 474                tcsetattr(0, TCSAFLUSH, &save);
 475                if (!perf_top__key_mapped(top, c))
 476                        return;
 477        }
 478
 479        switch (c) {
 480                case 'd':
 481                        prompt_integer(&top->delay_secs, "Enter display delay");
 482                        if (top->delay_secs < 1)
 483                                top->delay_secs = 1;
 484                        break;
 485                case 'e':
 486                        prompt_integer(&top->print_entries, "Enter display entries (lines)");
 487                        if (top->print_entries == 0) {
 488                                struct sigaction act = {
 489                                        .sa_sigaction = perf_top__sig_winch,
 490                                        .sa_flags     = SA_SIGINFO,
 491                                };
 492                                perf_top__sig_winch(SIGWINCH, NULL, top);
 493                                sigaction(SIGWINCH, &act, NULL);
 494                        } else {
 495                                perf_top__sig_winch(SIGWINCH, NULL, top);
 496                                signal(SIGWINCH, SIG_DFL);
 497                        }
 498                        break;
 499                case 'E':
 500                        if (top->evlist->nr_entries > 1) {
 501                                /* Select 0 as the default event: */
 502                                int counter = 0;
 503
 504                                fprintf(stderr, "\nAvailable events:");
 505
 506                                list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 507                                        fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
 508
 509                                prompt_integer(&counter, "Enter details event counter");
 510
 511                                if (counter >= top->evlist->nr_entries) {
 512                                        top->sym_evsel = list_entry(top->evlist->entries.next, struct perf_evsel, node);
 513                                        fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
 514                                        sleep(1);
 515                                        break;
 516                                }
 517                                list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 518                                        if (top->sym_evsel->idx == counter)
 519                                                break;
 520                        } else
 521                                top->sym_evsel = list_entry(top->evlist->entries.next, struct perf_evsel, node);
 522                        break;
 523                case 'f':
 524                        prompt_integer(&top->count_filter, "Enter display event count filter");
 525                        break;
 526                case 'F':
 527                        prompt_percent(&top->sym_pcnt_filter,
 528                                       "Enter details display event filter (percent)");
 529                        break;
 530                case 'K':
 531                        top->hide_kernel_symbols = !top->hide_kernel_symbols;
 532                        break;
 533                case 'q':
 534                case 'Q':
 535                        printf("exiting.\n");
 536                        if (top->dump_symtab)
 537                                perf_session__fprintf_dsos(top->session, stderr);
 538                        exit(0);
 539                case 's':
 540                        perf_top__prompt_symbol(top, "Enter details symbol");
 541                        break;
 542                case 'S':
 543                        if (!top->sym_filter_entry)
 544                                break;
 545                        else {
 546                                struct hist_entry *syme = top->sym_filter_entry;
 547
 548                                top->sym_filter_entry = NULL;
 549                                __zero_source_counters(syme);
 550                        }
 551                        break;
 552                case 'U':
 553                        top->hide_user_symbols = !top->hide_user_symbols;
 554                        break;
 555                case 'z':
 556                        top->zero = !top->zero;
 557                        break;
 558                default:
 559                        break;
 560        }
 561}
 562
 563static void perf_top__sort_new_samples(void *arg)
 564{
 565        struct perf_top *t = arg;
 566        perf_top__reset_sample_counters(t);
 567
 568        if (t->evlist->selected != NULL)
 569                t->sym_evsel = t->evlist->selected;
 570
 571        hists__collapse_resort_threaded(&t->sym_evsel->hists);
 572        hists__output_resort_threaded(&t->sym_evsel->hists);
 573        hists__decay_entries_threaded(&t->sym_evsel->hists,
 574                                      t->hide_user_symbols,
 575                                      t->hide_kernel_symbols);
 576}
 577
 578static void *display_thread_tui(void *arg)
 579{
 580        struct perf_evsel *pos;
 581        struct perf_top *top = arg;
 582        const char *help = "For a higher level overview, try: perf top --sort comm,dso";
 583
 584        perf_top__sort_new_samples(top);
 585
 586        /*
 587         * Initialize the uid_filter_str, in the future the TUI will allow
 588         * Zooming in/out UIDs. For now juse use whatever the user passed
 589         * via --uid.
 590         */
 591        list_for_each_entry(pos, &top->evlist->entries, node)
 592                pos->hists.uid_filter_str = top->target.uid_str;
 593
 594        perf_evlist__tui_browse_hists(top->evlist, help,
 595                                      perf_top__sort_new_samples,
 596                                      top, top->delay_secs);
 597
 598        exit_browser(0);
 599        exit(0);
 600        return NULL;
 601}
 602
 603static void *display_thread(void *arg)
 604{
 605        struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 606        struct termios tc, save;
 607        struct perf_top *top = arg;
 608        int delay_msecs, c;
 609
 610        tcgetattr(0, &save);
 611        tc = save;
 612        tc.c_lflag &= ~(ICANON | ECHO);
 613        tc.c_cc[VMIN] = 0;
 614        tc.c_cc[VTIME] = 0;
 615
 616        pthread__unblock_sigwinch();
 617repeat:
 618        delay_msecs = top->delay_secs * 1000;
 619        tcsetattr(0, TCSANOW, &tc);
 620        /* trash return*/
 621        getc(stdin);
 622
 623        while (1) {
 624                perf_top__print_sym_table(top);
 625                /*
 626                 * Either timeout expired or we got an EINTR due to SIGWINCH,
 627                 * refresh screen in both cases.
 628                 */
 629                switch (poll(&stdin_poll, 1, delay_msecs)) {
 630                case 0:
 631                        continue;
 632                case -1:
 633                        if (errno == EINTR)
 634                                continue;
 635                        /* Fall trhu */
 636                default:
 637                        goto process_hotkey;
 638                }
 639        }
 640process_hotkey:
 641        c = getc(stdin);
 642        tcsetattr(0, TCSAFLUSH, &save);
 643
 644        perf_top__handle_keypress(top, c);
 645        goto repeat;
 646
 647        return NULL;
 648}
 649
 650/* Tag samples to be skipped. */
 651static const char *skip_symbols[] = {
 652        "intel_idle",
 653        "default_idle",
 654        "native_safe_halt",
 655        "cpu_idle",
 656        "enter_idle",
 657        "exit_idle",
 658        "mwait_idle",
 659        "mwait_idle_with_hints",
 660        "poll_idle",
 661        "ppc64_runlatch_off",
 662        "pseries_dedicated_idle_sleep",
 663        NULL
 664};
 665
 666static int symbol_filter(struct map *map __used, struct symbol *sym)
 667{
 668        const char *name = sym->name;
 669        int i;
 670
 671        /*
 672         * ppc64 uses function descriptors and appends a '.' to the
 673         * start of every instruction address. Remove it.
 674         */
 675        if (name[0] == '.')
 676                name++;
 677
 678        if (!strcmp(name, "_text") ||
 679            !strcmp(name, "_etext") ||
 680            !strcmp(name, "_sinittext") ||
 681            !strncmp("init_module", name, 11) ||
 682            !strncmp("cleanup_module", name, 14) ||
 683            strstr(name, "_text_start") ||
 684            strstr(name, "_text_end"))
 685                return 1;
 686
 687        for (i = 0; skip_symbols[i]; i++) {
 688                if (!strcmp(skip_symbols[i], name)) {
 689                        sym->ignore = true;
 690                        break;
 691                }
 692        }
 693
 694        return 0;
 695}
 696
 697static void perf_event__process_sample(struct perf_tool *tool,
 698                                       const union perf_event *event,
 699                                       struct perf_evsel *evsel,
 700                                       struct perf_sample *sample,
 701                                       struct machine *machine)
 702{
 703        struct perf_top *top = container_of(tool, struct perf_top, tool);
 704        struct symbol *parent = NULL;
 705        u64 ip = event->ip.ip;
 706        struct addr_location al;
 707        int err;
 708
 709        if (!machine && perf_guest) {
 710                static struct intlist *seen;
 711
 712                if (!seen)
 713                        seen = intlist__new();
 714
 715                if (!intlist__has_entry(seen, event->ip.pid)) {
 716                        pr_err("Can't find guest [%d]'s kernel information\n",
 717                                event->ip.pid);
 718                        intlist__add(seen, event->ip.pid);
 719                }
 720                return;
 721        }
 722
 723        if (!machine) {
 724                pr_err("%u unprocessable samples recorded.",
 725                       top->session->hists.stats.nr_unprocessable_samples++);
 726                return;
 727        }
 728
 729        if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
 730                top->exact_samples++;
 731
 732        if (perf_event__preprocess_sample(event, machine, &al, sample,
 733                                          symbol_filter) < 0 ||
 734            al.filtered)
 735                return;
 736
 737        if (!top->kptr_restrict_warned &&
 738            symbol_conf.kptr_restrict &&
 739            al.cpumode == PERF_RECORD_MISC_KERNEL) {
 740                ui__warning(
 741"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
 742"Check /proc/sys/kernel/kptr_restrict.\n\n"
 743"Kernel%s samples will not be resolved.\n",
 744                          !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
 745                          " modules" : "");
 746                if (use_browser <= 0)
 747                        sleep(5);
 748                top->kptr_restrict_warned = true;
 749        }
 750
 751        if (al.sym == NULL) {
 752                const char *msg = "Kernel samples will not be resolved.\n";
 753                /*
 754                 * As we do lazy loading of symtabs we only will know if the
 755                 * specified vmlinux file is invalid when we actually have a
 756                 * hit in kernel space and then try to load it. So if we get
 757                 * here and there are _no_ symbols in the DSO backing the
 758                 * kernel map, bail out.
 759                 *
 760                 * We may never get here, for instance, if we use -K/
 761                 * --hide-kernel-symbols, even if the user specifies an
 762                 * invalid --vmlinux ;-)
 763                 */
 764                if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
 765                    al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 766                    RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 767                        if (symbol_conf.vmlinux_name) {
 768                                ui__warning("The %s file can't be used.\n%s",
 769                                            symbol_conf.vmlinux_name, msg);
 770                        } else {
 771                                ui__warning("A vmlinux file was not found.\n%s",
 772                                            msg);
 773                        }
 774
 775                        if (use_browser <= 0)
 776                                sleep(5);
 777                        top->vmlinux_warned = true;
 778                }
 779        }
 780
 781        if (al.sym == NULL || !al.sym->ignore) {
 782                struct hist_entry *he;
 783
 784                if ((sort__has_parent || symbol_conf.use_callchain) &&
 785                    sample->callchain) {
 786                        err = machine__resolve_callchain(machine, al.thread,
 787                                                         sample->callchain, &parent);
 788                        if (err)
 789                                return;
 790                }
 791
 792                he = perf_evsel__add_hist_entry(evsel, &al, sample);
 793                if (he == NULL) {
 794                        pr_err("Problem incrementing symbol period, skipping event\n");
 795                        return;
 796                }
 797
 798                if (symbol_conf.use_callchain) {
 799                        err = callchain_append(he->callchain, &callchain_cursor,
 800                                               sample->period);
 801                        if (err)
 802                                return;
 803                }
 804
 805                if (top->sort_has_symbols)
 806                        perf_top__record_precise_ip(top, he, evsel->idx, ip);
 807        }
 808
 809        return;
 810}
 811
 812static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 813{
 814        struct perf_sample sample;
 815        struct perf_evsel *evsel;
 816        struct perf_session *session = top->session;
 817        union perf_event *event;
 818        struct machine *machine;
 819        u8 origin;
 820        int ret;
 821
 822        while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
 823                ret = perf_evlist__parse_sample(top->evlist, event, &sample, false);
 824                if (ret) {
 825                        pr_err("Can't parse sample, err = %d\n", ret);
 826                        continue;
 827                }
 828
 829                evsel = perf_evlist__id2evsel(session->evlist, sample.id);
 830                assert(evsel != NULL);
 831
 832                origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 833
 834                if (event->header.type == PERF_RECORD_SAMPLE)
 835                        ++top->samples;
 836
 837                switch (origin) {
 838                case PERF_RECORD_MISC_USER:
 839                        ++top->us_samples;
 840                        if (top->hide_user_symbols)
 841                                continue;
 842                        machine = perf_session__find_host_machine(session);
 843                        break;
 844                case PERF_RECORD_MISC_KERNEL:
 845                        ++top->kernel_samples;
 846                        if (top->hide_kernel_symbols)
 847                                continue;
 848                        machine = perf_session__find_host_machine(session);
 849                        break;
 850                case PERF_RECORD_MISC_GUEST_KERNEL:
 851                        ++top->guest_kernel_samples;
 852                        machine = perf_session__find_machine(session, event->ip.pid);
 853                        break;
 854                case PERF_RECORD_MISC_GUEST_USER:
 855                        ++top->guest_us_samples;
 856                        /*
 857                         * TODO: we don't process guest user from host side
 858                         * except simple counting.
 859                         */
 860                        /* Fall thru */
 861                default:
 862                        continue;
 863                }
 864
 865
 866                if (event->header.type == PERF_RECORD_SAMPLE) {
 867                        perf_event__process_sample(&top->tool, event, evsel,
 868                                                   &sample, machine);
 869                } else if (event->header.type < PERF_RECORD_MAX) {
 870                        hists__inc_nr_events(&evsel->hists, event->header.type);
 871                        perf_event__process(&top->tool, event, &sample, machine);
 872                } else
 873                        ++session->hists.stats.nr_unknown_events;
 874        }
 875}
 876
 877static void perf_top__mmap_read(struct perf_top *top)
 878{
 879        int i;
 880
 881        for (i = 0; i < top->evlist->nr_mmaps; i++)
 882                perf_top__mmap_read_idx(top, i);
 883}
 884
 885static void perf_top__start_counters(struct perf_top *top)
 886{
 887        struct perf_evsel *counter, *first;
 888        struct perf_evlist *evlist = top->evlist;
 889
 890        first = list_entry(evlist->entries.next, struct perf_evsel, node);
 891
 892        list_for_each_entry(counter, &evlist->entries, node) {
 893                struct perf_event_attr *attr = &counter->attr;
 894                struct xyarray *group_fd = NULL;
 895
 896                if (top->group && counter != first)
 897                        group_fd = first->fd;
 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, top->group,
 929                                     group_fd) < 0) {
 930                        int err = errno;
 931
 932                        if (err == EPERM || err == EACCES) {
 933                                ui__error_paranoid();
 934                                goto out_err;
 935                        } else if (err == EINVAL) {
 936                                if (!top->exclude_guest_missing &&
 937                                    (attr->exclude_guest || attr->exclude_host)) {
 938                                        pr_debug("Old kernel, cannot exclude "
 939                                                 "guest or host samples.\n");
 940                                        top->exclude_guest_missing = true;
 941                                        goto fallback_missing_features;
 942                                } else if (!top->sample_id_all_missing) {
 943                                        /*
 944                                         * Old kernel, no attr->sample_id_type_all field
 945                                         */
 946                                        top->sample_id_all_missing = true;
 947                                        goto retry_sample_id;
 948                                }
 949                        }
 950                        /*
 951                         * If it's cycles then fall back to hrtimer
 952                         * based cpu-clock-tick sw counter, which
 953                         * is always available even if no PMU support:
 954                         */
 955                        if ((err == ENOENT || err == ENXIO) &&
 956                            (attr->type == PERF_TYPE_HARDWARE) &&
 957                            (attr->config == PERF_COUNT_HW_CPU_CYCLES)) {
 958
 959                                if (verbose)
 960                                        ui__warning("Cycles event not supported,\n"
 961                                                    "trying to fall back to cpu-clock-ticks\n");
 962
 963                                attr->type = PERF_TYPE_SOFTWARE;
 964                                attr->config = PERF_COUNT_SW_CPU_CLOCK;
 965                                if (counter->name) {
 966                                        free(counter->name);
 967                                        counter->name = NULL;
 968                                }
 969                                goto try_again;
 970                        }
 971
 972                        if (err == ENOENT) {
 973                                ui__error("The %s event is not supported.\n",
 974                                          perf_evsel__name(counter));
 975                                goto out_err;
 976                        } else if (err == EMFILE) {
 977                                ui__error("Too many events are opened.\n"
 978                                            "Try again after reducing the number of events\n");
 979                                goto out_err;
 980                        }
 981
 982                        ui__error("The sys_perf_event_open() syscall "
 983                                    "returned with %d (%s).  /bin/dmesg "
 984                                    "may provide additional information.\n"
 985                                    "No CONFIG_PERF_EVENTS=y kernel support "
 986                                    "configured?\n", err, strerror(err));
 987                        goto out_err;
 988                }
 989        }
 990
 991        if (perf_evlist__mmap(evlist, top->mmap_pages, false) < 0) {
 992                ui__error("Failed to mmap with %d (%s)\n",
 993                            errno, strerror(errno));
 994                goto out_err;
 995        }
 996
 997        return;
 998
 999out_err:
1000        exit_browser(0);
1001        exit(0);
1002}
1003
1004static int perf_top__setup_sample_type(struct perf_top *top)
1005{
1006        if (!top->sort_has_symbols) {
1007                if (symbol_conf.use_callchain) {
1008                        ui__error("Selected -g but \"sym\" not present in --sort/-s.");
1009                        return -EINVAL;
1010                }
1011        } else if (!top->dont_use_callchains && callchain_param.mode != CHAIN_NONE) {
1012                if (callchain_register_param(&callchain_param) < 0) {
1013                        ui__error("Can't register callchain params.\n");
1014                        return -EINVAL;
1015                }
1016        }
1017
1018        return 0;
1019}
1020
1021static int __cmd_top(struct perf_top *top)
1022{
1023        pthread_t thread;
1024        int ret;
1025        /*
1026         * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
1027         * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
1028         */
1029        top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
1030        if (top->session == NULL)
1031                return -ENOMEM;
1032
1033        ret = perf_top__setup_sample_type(top);
1034        if (ret)
1035                goto out_delete;
1036
1037        if (perf_target__has_task(&top->target))
1038                perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
1039                                                  perf_event__process,
1040                                                  &top->session->host_machine);
1041        else
1042                perf_event__synthesize_threads(&top->tool, perf_event__process,
1043                                               &top->session->host_machine);
1044        perf_top__start_counters(top);
1045        top->session->evlist = top->evlist;
1046        perf_session__set_id_hdr_size(top->session);
1047
1048        /* Wait for a minimal set of events before starting the snapshot */
1049        poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1050
1051        perf_top__mmap_read(top);
1052
1053        if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1054                                                            display_thread), top)) {
1055                ui__error("Could not create display thread.\n");
1056                exit(-1);
1057        }
1058
1059        if (top->realtime_prio) {
1060                struct sched_param param;
1061
1062                param.sched_priority = top->realtime_prio;
1063                if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1064                        ui__error("Could not set realtime priority.\n");
1065                        exit(-1);
1066                }
1067        }
1068
1069        while (1) {
1070                u64 hits = top->samples;
1071
1072                perf_top__mmap_read(top);
1073
1074                if (hits == top->samples)
1075                        ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1076        }
1077
1078out_delete:
1079        perf_session__delete(top->session);
1080        top->session = NULL;
1081
1082        return 0;
1083}
1084
1085static int
1086parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1087{
1088        struct perf_top *top = (struct perf_top *)opt->value;
1089        char *tok, *tok2;
1090        char *endptr;
1091
1092        /*
1093         * --no-call-graph
1094         */
1095        if (unset) {
1096                top->dont_use_callchains = true;
1097                return 0;
1098        }
1099
1100        symbol_conf.use_callchain = true;
1101
1102        if (!arg)
1103                return 0;
1104
1105        tok = strtok((char *)arg, ",");
1106        if (!tok)
1107                return -1;
1108
1109        /* get the output mode */
1110        if (!strncmp(tok, "graph", strlen(arg)))
1111                callchain_param.mode = CHAIN_GRAPH_ABS;
1112
1113        else if (!strncmp(tok, "flat", strlen(arg)))
1114                callchain_param.mode = CHAIN_FLAT;
1115
1116        else if (!strncmp(tok, "fractal", strlen(arg)))
1117                callchain_param.mode = CHAIN_GRAPH_REL;
1118
1119        else if (!strncmp(tok, "none", strlen(arg))) {
1120                callchain_param.mode = CHAIN_NONE;
1121                symbol_conf.use_callchain = false;
1122
1123                return 0;
1124        } else
1125                return -1;
1126
1127        /* get the min percentage */
1128        tok = strtok(NULL, ",");
1129        if (!tok)
1130                goto setup;
1131
1132        callchain_param.min_percent = strtod(tok, &endptr);
1133        if (tok == endptr)
1134                return -1;
1135
1136        /* get the print limit */
1137        tok2 = strtok(NULL, ",");
1138        if (!tok2)
1139                goto setup;
1140
1141        if (tok2[0] != 'c') {
1142                callchain_param.print_limit = strtod(tok2, &endptr);
1143                tok2 = strtok(NULL, ",");
1144                if (!tok2)
1145                        goto setup;
1146        }
1147
1148        /* get the call chain order */
1149        if (!strcmp(tok2, "caller"))
1150                callchain_param.order = ORDER_CALLER;
1151        else if (!strcmp(tok2, "callee"))
1152                callchain_param.order = ORDER_CALLEE;
1153        else
1154                return -1;
1155setup:
1156        if (callchain_register_param(&callchain_param) < 0) {
1157                fprintf(stderr, "Can't register callchain params\n");
1158                return -1;
1159        }
1160        return 0;
1161}
1162
1163static const char * const top_usage[] = {
1164        "perf top [<options>]",
1165        NULL
1166};
1167
1168int cmd_top(int argc, const char **argv, const char *prefix __used)
1169{
1170        struct perf_evsel *pos;
1171        int status;
1172        char errbuf[BUFSIZ];
1173        struct perf_top top = {
1174                .count_filter        = 5,
1175                .delay_secs          = 2,
1176                .freq                = 4000, /* 4 KHz */
1177                .mmap_pages          = 128,
1178                .sym_pcnt_filter     = 5,
1179                .target              = {
1180                        .uses_mmap   = true,
1181                },
1182        };
1183        char callchain_default_opt[] = "fractal,0.5,callee";
1184        const struct option options[] = {
1185        OPT_CALLBACK('e', "event", &top.evlist, "event",
1186                     "event selector. use 'perf list' to list available events",
1187                     parse_events_option),
1188        OPT_INTEGER('c', "count", &top.default_interval,
1189                    "event period to sample"),
1190        OPT_STRING('p', "pid", &top.target.pid, "pid",
1191                    "profile events on existing process id"),
1192        OPT_STRING('t', "tid", &top.target.tid, "tid",
1193                    "profile events on existing thread id"),
1194        OPT_BOOLEAN('a', "all-cpus", &top.target.system_wide,
1195                            "system-wide collection from all CPUs"),
1196        OPT_STRING('C', "cpu", &top.target.cpu_list, "cpu",
1197                    "list of cpus to monitor"),
1198        OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1199                   "file", "vmlinux pathname"),
1200        OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1201                    "hide kernel symbols"),
1202        OPT_UINTEGER('m', "mmap-pages", &top.mmap_pages, "number of mmap data pages"),
1203        OPT_INTEGER('r', "realtime", &top.realtime_prio,
1204                    "collect data with this RT SCHED_FIFO priority"),
1205        OPT_INTEGER('d', "delay", &top.delay_secs,
1206                    "number of seconds to delay between refreshes"),
1207        OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1208                            "dump the symbol table used for profiling"),
1209        OPT_INTEGER('f', "count-filter", &top.count_filter,
1210                    "only display functions with more events than this"),
1211        OPT_BOOLEAN('g', "group", &top.group,
1212                            "put the counters into a counter group"),
1213        OPT_BOOLEAN('i', "inherit", &top.inherit,
1214                    "child tasks inherit counters"),
1215        OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1216                    "symbol to annotate"),
1217        OPT_BOOLEAN('z', "zero", &top.zero,
1218                    "zero history across updates"),
1219        OPT_INTEGER('F', "freq", &top.freq,
1220                    "profile at this frequency"),
1221        OPT_INTEGER('E', "entries", &top.print_entries,
1222                    "display this many functions"),
1223        OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1224                    "hide user symbols"),
1225        OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1226        OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1227        OPT_INCR('v', "verbose", &verbose,
1228                    "be more verbose (show counter open errors, etc)"),
1229        OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1230                   "sort by key(s): pid, comm, dso, symbol, parent"),
1231        OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1232                    "Show a column with the number of samples"),
1233        OPT_CALLBACK_DEFAULT('G', "call-graph", &top, "output_type,min_percent, call_order",
1234                     "Display callchains using output_type (graph, flat, fractal, or none), min percent threshold and callchain order. "
1235                     "Default: fractal,0.5,callee", &parse_callchain_opt,
1236                     callchain_default_opt),
1237        OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1238                    "Show a column with the sum of periods"),
1239        OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1240                   "only consider symbols in these dsos"),
1241        OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1242                   "only consider symbols in these comms"),
1243        OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1244                   "only consider these symbols"),
1245        OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1246                    "Interleave source code with assembly code (default)"),
1247        OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1248                    "Display raw encoding of assembly instructions (default)"),
1249        OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1250                   "Specify disassembler style (e.g. -M intel for intel syntax)"),
1251        OPT_STRING('u', "uid", &top.target.uid_str, "user", "user to profile"),
1252        OPT_END()
1253        };
1254
1255        top.evlist = perf_evlist__new(NULL, NULL);
1256        if (top.evlist == NULL)
1257                return -ENOMEM;
1258
1259        symbol_conf.exclude_other = false;
1260
1261        argc = parse_options(argc, argv, options, top_usage, 0);
1262        if (argc)
1263                usage_with_options(top_usage, options);
1264
1265        if (sort_order == default_sort_order)
1266                sort_order = "dso,symbol";
1267
1268        setup_sorting(top_usage, options);
1269
1270        if (top.use_stdio)
1271                use_browser = 0;
1272        else if (top.use_tui)
1273                use_browser = 1;
1274
1275        setup_browser(false);
1276
1277        status = perf_target__validate(&top.target);
1278        if (status) {
1279                perf_target__strerror(&top.target, status, errbuf, BUFSIZ);
1280                ui__warning("%s", errbuf);
1281        }
1282
1283        status = perf_target__parse_uid(&top.target);
1284        if (status) {
1285                int saved_errno = errno;
1286
1287                perf_target__strerror(&top.target, status, errbuf, BUFSIZ);
1288                ui__error("%s", errbuf);
1289
1290                status = -saved_errno;
1291                goto out_delete_evlist;
1292        }
1293
1294        if (perf_target__none(&top.target))
1295                top.target.system_wide = true;
1296
1297        if (perf_evlist__create_maps(top.evlist, &top.target) < 0)
1298                usage_with_options(top_usage, options);
1299
1300        if (!top.evlist->nr_entries &&
1301            perf_evlist__add_default(top.evlist) < 0) {
1302                ui__error("Not enough memory for event selector list\n");
1303                return -ENOMEM;
1304        }
1305
1306        symbol_conf.nr_events = top.evlist->nr_entries;
1307
1308        if (top.delay_secs < 1)
1309                top.delay_secs = 1;
1310
1311        /*
1312         * User specified count overrides default frequency.
1313         */
1314        if (top.default_interval)
1315                top.freq = 0;
1316        else if (top.freq) {
1317                top.default_interval = top.freq;
1318        } else {
1319                ui__error("frequency and count are zero, aborting\n");
1320                exit(EXIT_FAILURE);
1321        }
1322
1323        list_for_each_entry(pos, &top.evlist->entries, node) {
1324                /*
1325                 * Fill in the ones not specifically initialized via -c:
1326                 */
1327                if (!pos->attr.sample_period)
1328                        pos->attr.sample_period = top.default_interval;
1329        }
1330
1331        top.sym_evsel = list_entry(top.evlist->entries.next, struct perf_evsel, node);
1332
1333        symbol_conf.priv_size = sizeof(struct annotation);
1334
1335        symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1336        if (symbol__init() < 0)
1337                return -1;
1338
1339        sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
1340        sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
1341        sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
1342
1343        /*
1344         * Avoid annotation data structures overhead when symbols aren't on the
1345         * sort list.
1346         */
1347        top.sort_has_symbols = sort_sym.list.next != NULL;
1348
1349        get_term_dimensions(&top.winsize);
1350        if (top.print_entries == 0) {
1351                struct sigaction act = {
1352                        .sa_sigaction = perf_top__sig_winch,
1353                        .sa_flags     = SA_SIGINFO,
1354                };
1355                perf_top__update_print_entries(&top);
1356                sigaction(SIGWINCH, &act, NULL);
1357        }
1358
1359        status = __cmd_top(&top);
1360
1361out_delete_evlist:
1362        perf_evlist__delete(top.evlist);
1363
1364        return status;
1365}
1366
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