tools/perf/builtin-top.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * builtin-top.c
   4  *
   5  * Builtin top command: Display a continuously updated profile of
   6  * any workload, CPU or specific PID.
   7  *
   8  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
   9  *               2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  10  *
  11  * Improvements and fixes by:
  12  *
  13  *   Arjan van de Ven <arjan@linux.intel.com>
  14  *   Yanmin Zhang <yanmin.zhang@intel.com>
  15  *   Wu Fengguang <fengguang.wu@intel.com>
  16  *   Mike Galbraith <efault@gmx.de>
  17  *   Paul Mackerras <paulus@samba.org>
  18  */
  19 #include "builtin.h"
  20
  21 #include "perf.h"
  22
  23 #include "util/annotate.h"
  24 #include "util/bpf-event.h"
  25 #include "util/config.h"
  26 #include "util/color.h"
  27 #include "util/evlist.h"
  28 #include "util/evsel.h"
  29 #include "util/event.h"
  30 #include "util/machine.h"
  31 #include "util/map.h"
  32 #include "util/session.h"
  33 #include "util/symbol.h"
  34 #include "util/thread.h"
  35 #include "util/thread_map.h"
  36 #include "util/top.h"
  37 #include <linux/rbtree.h>
  38 #include <subcmd/parse-options.h>
  39 #include "util/parse-events.h"
  40 #include "util/cpumap.h"
  41 #include "util/sort.h"
  42 #include "util/string2.h"
  43 #include "util/term.h"
  44 #include "util/intlist.h"
  45 #include "util/parse-branch-options.h"
  46 #include "arch/common.h"
  47
  48 #include "util/debug.h"
  49 #include "util/ordered-events.h"
  50
  51 #include <assert.h>
  52 #include <elf.h>
  53 #include <fcntl.h>
  54
  55 #include <stdio.h>
  56 #include <termios.h>
  57 #include <unistd.h>
  58 #include <inttypes.h>
  59
  60 #include <errno.h>
  61 #include <time.h>
  62 #include <sched.h>
  63 #include <signal.h>
  64
  65 #include <sys/syscall.h>
  66 #include <sys/ioctl.h>
  67 #include <poll.h>
  68 #include <sys/prctl.h>
  69 #include <sys/wait.h>
  70 #include <sys/uio.h>
  71 #include <sys/utsname.h>
  72 #include <sys/mman.h>
  73
  74 #include <linux/stringify.h>
  75 #include <linux/time64.h>
  76 #include <linux/types.h>
  77
  78 #include <linux/ctype.h>
  79
  80 static volatile int done;
  81 static volatile int resize;
  82
  83 #define HEADER_LINE_NR  5
  84
  85 static void perf_top__update_print_entries(struct perf_top *top)
  86 {
  87         top->print_entries = top->winsize.ws_row - HEADER_LINE_NR;
  88 }
  89
  90 static void winch_sig(int sig __maybe_unused)
  91 {
  92         resize = 1;
  93 }
  94
  95 static void perf_top__resize(struct perf_top *top)
  96 {
  97         get_term_dimensions(&top->winsize);
  98         perf_top__update_print_entries(top);
  99 }
 100
 101 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 102 {
 103         struct evsel *evsel;
 104         struct symbol *sym;
 105         struct annotation *notes;
 106         struct map *map;
 107         int err = -1;
 108
 109         if (!he || !he->ms.sym)
 110                 return -1;
 111
 112         evsel = hists_to_evsel(he->hists);
 113
 114         sym = he->ms.sym;
 115         map = he->ms.map;
 116
 117         /*
 118          * We can't annotate with just /proc/kallsyms
 119          */
 120         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
 121             !dso__is_kcore(map->dso)) {
 122                 pr_err("Can't annotate %s: No vmlinux file was found in the "
 123                        "path\n", sym->name);
 124                 sleep(1);
 125                 return -1;
 126         }
 127
 128         notes = symbol__annotation(sym);
 129         pthread_mutex_lock(&notes->lock);
 130
 131         if (!symbol__hists(sym, top->evlist->core.nr_entries)) {
 132                 pthread_mutex_unlock(&notes->lock);
 133                 pr_err("Not enough memory for annotating '%s' symbol!\n",
 134                        sym->name);
 135                 sleep(1);
 136                 return err;
 137         }
 138
 139         err = symbol__annotate(sym, map, evsel, 0, &top->annotation_opts, NULL);
 140         if (err == 0) {
 141                 top->sym_filter_entry = he;
 142         } else {
 143                 char msg[BUFSIZ];
 144                 symbol__strerror_disassemble(sym, map, err, msg, sizeof(msg));
 145                 pr_err("Couldn't annotate %s: %s\n", sym->name, msg);
 146         }
 147
 148         pthread_mutex_unlock(&notes->lock);
 149         return err;
 150 }
 151
 152 static void __zero_source_counters(struct hist_entry *he)
 153 {
 154         struct symbol *sym = he->ms.sym;
 155         symbol__annotate_zero_histograms(sym);
 156 }
 157
 158 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
 159 {
 160         struct utsname uts;
 161         int err = uname(&uts);
 162
 163         ui__warning("Out of bounds address found:\n\n"
 164                     "Addr:   %" PRIx64 "\n"
 165                     "DSO:    %s %c\n"
 166                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
 167                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
 168                     "Arch:   %s\n"
 169                     "Kernel: %s\n"
 170                     "Tools:  %s\n\n"
 171                     "Not all samples will be on the annotation output.\n\n"
 172                     "Please report to linux-kernel@vger.kernel.org\n",
 173                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
 174                     map->start, map->end, sym->start, sym->end,
 175                     sym->binding == STB_GLOBAL ? 'g' :
 176                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
 177                     err ? "[unknown]" : uts.machine,
 178                     err ? "[unknown]" : uts.release, perf_version_string);
 179         if (use_browser <= 0)
 180                 sleep(5);
 181
 182         map->erange_warned = true;
 183 }
 184
 185 static void perf_top__record_precise_ip(struct perf_top *top,
 186                                         struct hist_entry *he,
 187                                         struct perf_sample *sample,
 188                                         struct evsel *evsel, u64 ip)
 189 {
 190         struct annotation *notes;
 191         struct symbol *sym = he->ms.sym;
 192         int err = 0;
 193
 194         if (sym == NULL || (use_browser == 0 &&
 195                             (top->sym_filter_entry == NULL ||
 196                              top->sym_filter_entry->ms.sym != sym)))
 197                 return;
 198
 199         notes = symbol__annotation(sym);
 200
 201         if (pthread_mutex_trylock(&notes->lock))
 202                 return;
 203
 204         err = hist_entry__inc_addr_samples(he, sample, evsel, ip);
 205
 206         pthread_mutex_unlock(&notes->lock);
 207
 208         if (unlikely(err)) {
 209                 /*
 210                  * This function is now called with he->hists->lock held.
 211                  * Release it before going to sleep.
 212                  */
 213                 pthread_mutex_unlock(&he->hists->lock);
 214
 215                 if (err == -ERANGE && !he->ms.map->erange_warned)
 216                         ui__warn_map_erange(he->ms.map, sym, ip);
 217                 else if (err == -ENOMEM) {
 218                         pr_err("Not enough memory for annotating '%s' symbol!\n",
 219                                sym->name);
 220                         sleep(1);
 221                 }
 222
 223                 pthread_mutex_lock(&he->hists->lock);
 224         }
 225 }
 226
 227 static void perf_top__show_details(struct perf_top *top)
 228 {
 229         struct hist_entry *he = top->sym_filter_entry;
 230         struct evsel *evsel;
 231         struct annotation *notes;
 232         struct symbol *symbol;
 233         int more;
 234
 235         if (!he)
 236                 return;
 237
 238         evsel = hists_to_evsel(he->hists);
 239
 240         symbol = he->ms.sym;
 241         notes = symbol__annotation(symbol);
 242
 243         pthread_mutex_lock(&notes->lock);
 244
 245         symbol__calc_percent(symbol, evsel);
 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->annotation_opts.min_pcnt);
 252
 253         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel, &top->annotation_opts);
 254
 255         if (top->evlist->enabled) {
 256                 if (top->zero)
 257                         symbol__annotate_zero_histogram(symbol, top->sym_evsel->idx);
 258                 else
 259                         symbol__annotate_decay_histogram(symbol, top->sym_evsel->idx);
 260         }
 261         if (more != 0)
 262                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 263 out_unlock:
 264         pthread_mutex_unlock(&notes->lock);
 265 }
 266
 267 static void evlist__resort_hists(struct evlist *evlist)
 268 {
 269         struct evsel *pos;
 270
 271         evlist__for_each_entry(evlist, pos) {
 272                 struct hists *hists = evsel__hists(pos);
 273
 274                 hists__collapse_resort(hists, NULL);
 275
 276                 /* Non-group events are considered as leader */
 277                 if (symbol_conf.event_group &&
 278                     !perf_evsel__is_group_leader(pos)) {
 279                         struct hists *leader_hists = evsel__hists(pos->leader);
 280
 281                         hists__match(leader_hists, hists);
 282                         hists__link(leader_hists, hists);
 283                 }
 284         }
 285
 286         evlist__for_each_entry(evlist, pos) {
 287                 perf_evsel__output_resort(pos, NULL);
 288         }
 289 }
 290
 291 static void perf_top__print_sym_table(struct perf_top *top)
 292 {
 293         char bf[160];
 294         int printed = 0;
 295         const int win_width = top->winsize.ws_col - 1;
 296         struct evsel *evsel = top->sym_evsel;
 297         struct hists *hists = evsel__hists(evsel);
 298
 299         puts(CONSOLE_CLEAR);
 300
 301         perf_top__header_snprintf(top, bf, sizeof(bf));
 302         printf("%s\n", bf);
 303
 304         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 305
 306         if (!top->record_opts.overwrite &&
 307             (hists->stats.nr_lost_warned !=
 308             hists->stats.nr_events[PERF_RECORD_LOST])) {
 309                 hists->stats.nr_lost_warned =
 310                               hists->stats.nr_events[PERF_RECORD_LOST];
 311                 color_fprintf(stdout, PERF_COLOR_RED,
 312                               "WARNING: LOST %d chunks, Check IO/CPU overload",
 313                               hists->stats.nr_lost_warned);
 314                 ++printed;
 315         }
 316
 317         if (top->sym_filter_entry) {
 318                 perf_top__show_details(top);
 319                 return;
 320         }
 321
 322         if (top->evlist->enabled) {
 323                 if (top->zero) {
 324                         hists__delete_entries(hists);
 325                 } else {
 326                         hists__decay_entries(hists, top->hide_user_symbols,
 327                                              top->hide_kernel_symbols);
 328                 }
 329         }
 330
 331         evlist__resort_hists(top->evlist);
 332
 333         hists__output_recalc_col_len(hists, top->print_entries - printed);
 334         putchar('\n');
 335         hists__fprintf(hists, false, top->print_entries - printed, win_width,
 336                        top->min_percent, stdout, !symbol_conf.use_callchain);
 337 }
 338
 339 static void prompt_integer(int *target, const char *msg)
 340 {
 341         char *buf = malloc(0), *p;
 342         size_t dummy = 0;
 343         int tmp;
 344
 345         fprintf(stdout, "\n%s: ", msg);
 346         if (getline(&buf, &dummy, stdin) < 0)
 347                 return;
 348
 349         p = strchr(buf, '\n');
 350         if (p)
 351                 *p = 0;
 352
 353         p = buf;
 354         while(*p) {
 355                 if (!isdigit(*p))
 356                         goto out_free;
 357                 p++;
 358         }
 359         tmp = strtoul(buf, NULL, 10);
 360         *target = tmp;
 361 out_free:
 362         free(buf);
 363 }
 364
 365 static void prompt_percent(int *target, const char *msg)
 366 {
 367         int tmp = 0;
 368
 369         prompt_integer(&tmp, msg);
 370         if (tmp >= 0 && tmp <= 100)
 371                 *target = tmp;
 372 }
 373
 374 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 375 {
 376         char *buf = malloc(0), *p;
 377         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
 378         struct hists *hists = evsel__hists(top->sym_evsel);
 379         struct rb_node *next;
 380         size_t dummy = 0;
 381
 382         /* zero counters of active symbol */
 383         if (syme) {
 384                 __zero_source_counters(syme);
 385                 top->sym_filter_entry = NULL;
 386         }
 387
 388         fprintf(stdout, "\n%s: ", msg);
 389         if (getline(&buf, &dummy, stdin) < 0)
 390                 goto out_free;
 391
 392         p = strchr(buf, '\n');
 393         if (p)
 394                 *p = 0;
 395
 396         next = rb_first_cached(&hists->entries);
 397         while (next) {
 398                 n = rb_entry(next, struct hist_entry, rb_node);
 399                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
 400                         found = n;
 401                         break;
 402                 }
 403                 next = rb_next(&n->rb_node);
 404         }
 405
 406         if (!found) {
 407                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
 408                 sleep(1);
 409         } else
 410                 perf_top__parse_source(top, found);
 411
 412 out_free:
 413         free(buf);
 414 }
 415
 416 static void perf_top__print_mapped_keys(struct perf_top *top)
 417 {
 418         char *name = NULL;
 419
 420         if (top->sym_filter_entry) {
 421                 struct symbol *sym = top->sym_filter_entry->ms.sym;
 422                 name = sym->name;
 423         }
 424
 425         fprintf(stdout, "\nMapped keys:\n");
 426         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
 427         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
 428
 429         if (top->evlist->core.nr_entries > 1)
 430                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
 431
 432         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
 433
 434         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->annotation_opts.min_pcnt);
 435         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 436         fprintf(stdout, "\t[S]     stop annotation.\n");
 437
 438         fprintf(stdout,
 439                 "\t[K]     hide kernel symbols.             \t(%s)\n",
 440                 top->hide_kernel_symbols ? "yes" : "no");
 441         fprintf(stdout,
 442                 "\t[U]     hide user symbols.               \t(%s)\n",
 443                 top->hide_user_symbols ? "yes" : "no");
 444         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
 445         fprintf(stdout, "\t[qQ]    quit.\n");
 446 }
 447
 448 static int perf_top__key_mapped(struct perf_top *top, int c)
 449 {
 450         switch (c) {
 451                 case 'd':
 452                 case 'e':
 453                 case 'f':
 454                 case 'z':
 455                 case 'q':
 456                 case 'Q':
 457                 case 'K':
 458                 case 'U':
 459                 case 'F':
 460                 case 's':
 461                 case 'S':
 462                         return 1;
 463                 case 'E':
 464                         return top->evlist->core.nr_entries > 1 ? 1 : 0;
 465                 default:
 466                         break;
 467         }
 468
 469         return 0;
 470 }
 471
 472 static bool perf_top__handle_keypress(struct perf_top *top, int c)
 473 {
 474         bool ret = true;
 475
 476         if (!perf_top__key_mapped(top, c)) {
 477                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 478                 struct termios save;
 479
 480                 perf_top__print_mapped_keys(top);
 481                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 482                 fflush(stdout);
 483
 484                 set_term_quiet_input(&save);
 485
 486                 poll(&stdin_poll, 1, -1);
 487                 c = getc(stdin);
 488
 489                 tcsetattr(0, TCSAFLUSH, &save);
 490                 if (!perf_top__key_mapped(top, c))
 491                         return ret;
 492         }
 493
 494         switch (c) {
 495                 case 'd':
 496                         prompt_integer(&top->delay_secs, "Enter display delay");
 497                         if (top->delay_secs < 1)
 498                                 top->delay_secs = 1;
 499                         break;
 500                 case 'e':
 501                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
 502                         if (top->print_entries == 0) {
 503                                 perf_top__resize(top);
 504                                 signal(SIGWINCH, winch_sig);
 505                         } else {
 506                                 signal(SIGWINCH, SIG_DFL);
 507                         }
 508                         break;
 509                 case 'E':
 510                         if (top->evlist->core.nr_entries > 1) {
 511                                 /* Select 0 as the default event: */
 512                                 int counter = 0;
 513
 514                                 fprintf(stderr, "\nAvailable events:");
 515
 516                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
 517                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
 518
 519                                 prompt_integer(&counter, "Enter details event counter");
 520
 521                                 if (counter >= top->evlist->core.nr_entries) {
 522                                         top->sym_evsel = perf_evlist__first(top->evlist);
 523                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
 524                                         sleep(1);
 525                                         break;
 526                                 }
 527                                 evlist__for_each_entry(top->evlist, top->sym_evsel)
 528                                         if (top->sym_evsel->idx == counter)
 529                                                 break;
 530                         } else
 531                                 top->sym_evsel = perf_evlist__first(top->evlist);
 532                         break;
 533                 case 'f':
 534                         prompt_integer(&top->count_filter, "Enter display event count filter");
 535                         break;
 536                 case 'F':
 537                         prompt_percent(&top->annotation_opts.min_pcnt,
 538                                        "Enter details display event filter (percent)");
 539                         break;
 540                 case 'K':
 541                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
 542                         break;
 543                 case 'q':
 544                 case 'Q':
 545                         printf("exiting.\n");
 546                         if (top->dump_symtab)
 547                                 perf_session__fprintf_dsos(top->session, stderr);
 548                         ret = false;
 549                         break;
 550                 case 's':
 551                         perf_top__prompt_symbol(top, "Enter details symbol");
 552                         break;
 553                 case 'S':
 554                         if (!top->sym_filter_entry)
 555                                 break;
 556                         else {
 557                                 struct hist_entry *syme = top->sym_filter_entry;
 558
 559                                 top->sym_filter_entry = NULL;
 560                                 __zero_source_counters(syme);
 561                         }
 562                         break;
 563                 case 'U':
 564                         top->hide_user_symbols = !top->hide_user_symbols;
 565                         break;
 566                 case 'z':
 567                         top->zero = !top->zero;
 568                         break;
 569                 default:
 570                         break;
 571         }
 572
 573         return ret;
 574 }
 575
 576 static void perf_top__sort_new_samples(void *arg)
 577 {
 578         struct perf_top *t = arg;
 579         struct evsel *evsel = t->sym_evsel;
 580         struct hists *hists;
 581
 582         if (t->evlist->selected != NULL)
 583                 t->sym_evsel = t->evlist->selected;
 584
 585         hists = evsel__hists(evsel);
 586
 587         if (t->evlist->enabled) {
 588                 if (t->zero) {
 589                         hists__delete_entries(hists);
 590                 } else {
 591                         hists__decay_entries(hists, t->hide_user_symbols,
 592                                              t->hide_kernel_symbols);
 593                 }
 594         }
 595
 596         evlist__resort_hists(t->evlist);
 597
 598         if (t->lost || t->drop)
 599                 pr_warning("Too slow to read ring buffer (change period (-c/-F) or limit CPUs (-C)\n");
 600 }
 601
 602 static void stop_top(void)
 603 {
 604         session_done = 1;
 605         done = 1;
 606 }
 607
 608 static void *display_thread_tui(void *arg)
 609 {
 610         struct evsel *pos;
 611         struct perf_top *top = arg;
 612         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
 613         struct hist_browser_timer hbt = {
 614                 .timer          = perf_top__sort_new_samples,
 615                 .arg            = top,
 616                 .refresh        = top->delay_secs,
 617         };
 618
 619         /* In order to read symbols from other namespaces perf to  needs to call
 620          * setns(2).  This isn't permitted if the struct_fs has multiple users.
 621          * unshare(2) the fs so that we may continue to setns into namespaces
 622          * that we're observing.
 623          */
 624         unshare(CLONE_FS);
 625
 626         prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
 627
 628         perf_top__sort_new_samples(top);
 629
 630         /*
 631          * Initialize the uid_filter_str, in the future the TUI will allow
 632          * Zooming in/out UIDs. For now just use whatever the user passed
 633          * via --uid.
 634          */
 635         evlist__for_each_entry(top->evlist, pos) {
 636                 struct hists *hists = evsel__hists(pos);
 637                 hists->uid_filter_str = top->record_opts.target.uid_str;
 638         }
 639
 640         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
 641                                       top->min_percent,
 642                                       &top->session->header.env,
 643                                       !top->record_opts.overwrite,
 644                                       &top->annotation_opts);
 645
 646         stop_top();
 647         return NULL;
 648 }
 649
 650 static void display_sig(int sig __maybe_unused)
 651 {
 652         stop_top();
 653 }
 654
 655 static void display_setup_sig(void)
 656 {
 657         signal(SIGSEGV, sighandler_dump_stack);
 658         signal(SIGFPE, sighandler_dump_stack);
 659         signal(SIGINT,  display_sig);
 660         signal(SIGQUIT, display_sig);
 661         signal(SIGTERM, display_sig);
 662 }
 663
 664 static void *display_thread(void *arg)
 665 {
 666         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 667         struct termios save;
 668         struct perf_top *top = arg;
 669         int delay_msecs, c;
 670
 671         /* In order to read symbols from other namespaces perf to  needs to call
 672          * setns(2).  This isn't permitted if the struct_fs has multiple users.
 673          * unshare(2) the fs so that we may continue to setns into namespaces
 674          * that we're observing.
 675          */
 676         unshare(CLONE_FS);
 677
 678         prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
 679
 680         display_setup_sig();
 681         pthread__unblock_sigwinch();
 682 repeat:
 683         delay_msecs = top->delay_secs * MSEC_PER_SEC;
 684         set_term_quiet_input(&save);
 685         /* trash return*/
 686         getc(stdin);
 687
 688         while (!done) {
 689                 perf_top__print_sym_table(top);
 690                 /*
 691                  * Either timeout expired or we got an EINTR due to SIGWINCH,
 692                  * refresh screen in both cases.
 693                  */
 694                 switch (poll(&stdin_poll, 1, delay_msecs)) {
 695                 case 0:
 696                         continue;
 697                 case -1:
 698                         if (errno == EINTR)
 699                                 continue;
 700                         __fallthrough;
 701                 default:
 702                         c = getc(stdin);
 703                         tcsetattr(0, TCSAFLUSH, &save);
 704
 705                         if (perf_top__handle_keypress(top, c))
 706                                 goto repeat;
 707                         stop_top();
 708                 }
 709         }
 710
 711         tcsetattr(0, TCSAFLUSH, &save);
 712         return NULL;
 713 }
 714
 715 static int hist_iter__top_callback(struct hist_entry_iter *iter,
 716                                    struct addr_location *al, bool single,
 717                                    void *arg)
 718 {
 719         struct perf_top *top = arg;
 720         struct hist_entry *he = iter->he;
 721         struct evsel *evsel = iter->evsel;
 722
 723         if (perf_hpp_list.sym && single)
 724                 perf_top__record_precise_ip(top, he, iter->sample, evsel, al->addr);
 725
 726         hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
 727                      !(top->record_opts.branch_stack & PERF_SAMPLE_BRANCH_ANY));
 728         return 0;
 729 }
 730
 731 static void perf_event__process_sample(struct perf_tool *tool,
 732                                        const union perf_event *event,
 733                                        struct evsel *evsel,
 734                                        struct perf_sample *sample,
 735                                        struct machine *machine)
 736 {
 737         struct perf_top *top = container_of(tool, struct perf_top, tool);
 738         struct addr_location al;
 739         int err;
 740
 741         if (!machine && perf_guest) {
 742                 static struct intlist *seen;
 743
 744                 if (!seen)
 745                         seen = intlist__new(NULL);
 746
 747                 if (!intlist__has_entry(seen, sample->pid)) {
 748                         pr_err("Can't find guest [%d]'s kernel information\n",
 749                                 sample->pid);
 750                         intlist__add(seen, sample->pid);
 751                 }
 752                 return;
 753         }
 754
 755         if (!machine) {
 756                 pr_err("%u unprocessable samples recorded.\r",
 757                        top->session->evlist->stats.nr_unprocessable_samples++);
 758                 return;
 759         }
 760
 761         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
 762                 top->exact_samples++;
 763
 764         if (machine__resolve(machine, &al, sample) < 0)
 765                 return;
 766
 767         if (!machine->kptr_restrict_warned &&
 768             symbol_conf.kptr_restrict &&
 769             al.cpumode == PERF_RECORD_MISC_KERNEL) {
 770                 if (!perf_evlist__exclude_kernel(top->session->evlist)) {
 771                         ui__warning(
 772 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
 773 "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
 774 "Kernel%s samples will not be resolved.\n",
 775                           al.map && map__has_symbols(al.map) ?
 776                           " modules" : "");
 777                         if (use_browser <= 0)
 778                                 sleep(5);
 779                 }
 780                 machine->kptr_restrict_warned = true;
 781         }
 782
 783         if (al.sym == NULL && al.map != NULL) {
 784                 const char *msg = "Kernel samples will not be resolved.\n";
 785                 /*
 786                  * As we do lazy loading of symtabs we only will know if the
 787                  * specified vmlinux file is invalid when we actually have a
 788                  * hit in kernel space and then try to load it. So if we get
 789                  * here and there are _no_ symbols in the DSO backing the
 790                  * kernel map, bail out.
 791                  *
 792                  * We may never get here, for instance, if we use -K/
 793                  * --hide-kernel-symbols, even if the user specifies an
 794                  * invalid --vmlinux ;-)
 795                  */
 796                 if (!machine->kptr_restrict_warned && !top->vmlinux_warned &&
 797                     __map__is_kernel(al.map) && map__has_symbols(al.map)) {
 798                         if (symbol_conf.vmlinux_name) {
 799                                 char serr[256];
 800                                 dso__strerror_load(al.map->dso, serr, sizeof(serr));
 801                                 ui__warning("The %s file can't be used: %s\n%s",
 802                                             symbol_conf.vmlinux_name, serr, msg);
 803                         } else {
 804                                 ui__warning("A vmlinux file was not found.\n%s",
 805                                             msg);
 806                         }
 807
 808                         if (use_browser <= 0)
 809                                 sleep(5);
 810                         top->vmlinux_warned = true;
 811                 }
 812         }
 813
 814         if (al.sym == NULL || !al.sym->idle) {
 815                 struct hists *hists = evsel__hists(evsel);
 816                 struct hist_entry_iter iter = {
 817                         .evsel          = evsel,
 818                         .sample         = sample,
 819                         .add_entry_cb   = hist_iter__top_callback,
 820                 };
 821
 822                 if (symbol_conf.cumulate_callchain)
 823                         iter.ops = &hist_iter_cumulative;
 824                 else
 825                         iter.ops = &hist_iter_normal;
 826
 827                 pthread_mutex_lock(&hists->lock);
 828
 829                 err = hist_entry_iter__add(&iter, &al, top->max_stack, top);
 830                 if (err < 0)
 831                         pr_err("Problem incrementing symbol period, skipping event\n");
 832
 833                 pthread_mutex_unlock(&hists->lock);
 834         }
 835
 836         addr_location__put(&al);
 837 }
 838
 839 static void
 840 perf_top__process_lost(struct perf_top *top, union perf_event *event,
 841                        struct evsel *evsel)
 842 {
 843         struct hists *hists = evsel__hists(evsel);
 844
 845         top->lost += event->lost.lost;
 846         top->lost_total += event->lost.lost;
 847         hists->stats.total_lost += event->lost.lost;
 848 }
 849
 850 static void
 851 perf_top__process_lost_samples(struct perf_top *top,
 852                                union perf_event *event,
 853                                struct evsel *evsel)
 854 {
 855         struct hists *hists = evsel__hists(evsel);
 856
 857         top->lost += event->lost_samples.lost;
 858         top->lost_total += event->lost_samples.lost;
 859         hists->stats.total_lost_samples += event->lost_samples.lost;
 860 }
 861
 862 static u64 last_timestamp;
 863
 864 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 865 {
 866         struct record_opts *opts = &top->record_opts;
 867         struct evlist *evlist = top->evlist;
 868         struct perf_mmap *md;
 869         union perf_event *event;
 870
 871         md = opts->overwrite ? &evlist->overwrite_mmap[idx] : &evlist->mmap[idx];
 872         if (perf_mmap__read_init(md) < 0)
 873                 return;
 874
 875         while ((event = perf_mmap__read_event(md)) != NULL) {
 876                 int ret;
 877
 878                 ret = perf_evlist__parse_sample_timestamp(evlist, event, &last_timestamp);
 879                 if (ret && ret != -1)
 880                         break;
 881
 882                 ret = ordered_events__queue(top->qe.in, event, last_timestamp, 0);
 883                 if (ret)
 884                         break;
 885
 886                 perf_mmap__consume(md);
 887
 888                 if (top->qe.rotate) {
 889                         pthread_mutex_lock(&top->qe.mutex);
 890                         top->qe.rotate = false;
 891                         pthread_cond_signal(&top->qe.cond);
 892                         pthread_mutex_unlock(&top->qe.mutex);
 893                 }
 894         }
 895
 896         perf_mmap__read_done(md);
 897 }
 898
 899 static void perf_top__mmap_read(struct perf_top *top)
 900 {
 901         bool overwrite = top->record_opts.overwrite;
 902         struct evlist *evlist = top->evlist;
 903         int i;
 904
 905         if (overwrite)
 906                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_DATA_PENDING);
 907
 908         for (i = 0; i < top->evlist->nr_mmaps; i++)
 909                 perf_top__mmap_read_idx(top, i);
 910
 911         if (overwrite) {
 912                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
 913                 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
 914         }
 915 }
 916
 917 /*
 918  * Check per-event overwrite term.
 919  * perf top should support consistent term for all events.
 920  * - All events don't have per-event term
 921  *   E.g. "cpu/cpu-cycles/,cpu/instructions/"
 922  *   Nothing change, return 0.
 923  * - All events have same per-event term
 924  *   E.g. "cpu/cpu-cycles,no-overwrite/,cpu/instructions,no-overwrite/
 925  *   Using the per-event setting to replace the opts->overwrite if
 926  *   they are different, then return 0.
 927  * - Events have different per-event term
 928  *   E.g. "cpu/cpu-cycles,overwrite/,cpu/instructions,no-overwrite/"
 929  *   Return -1
 930  * - Some of the event set per-event term, but some not.
 931  *   E.g. "cpu/cpu-cycles/,cpu/instructions,no-overwrite/"
 932  *   Return -1
 933  */
 934 static int perf_top__overwrite_check(struct perf_top *top)
 935 {
 936         struct record_opts *opts = &top->record_opts;
 937         struct evlist *evlist = top->evlist;
 938         struct perf_evsel_config_term *term;
 939         struct list_head *config_terms;
 940         struct evsel *evsel;
 941         int set, overwrite = -1;
 942
 943         evlist__for_each_entry(evlist, evsel) {
 944                 set = -1;
 945                 config_terms = &evsel->config_terms;
 946                 list_for_each_entry(term, config_terms, list) {
 947                         if (term->type == PERF_EVSEL__CONFIG_TERM_OVERWRITE)
 948                                 set = term->val.overwrite ? 1 : 0;
 949                 }
 950
 951                 /* no term for current and previous event (likely) */
 952                 if ((overwrite < 0) && (set < 0))
 953                         continue;
 954
 955                 /* has term for both current and previous event, compare */
 956                 if ((overwrite >= 0) && (set >= 0) && (overwrite != set))
 957                         return -1;
 958
 959                 /* no term for current event but has term for previous one */
 960                 if ((overwrite >= 0) && (set < 0))
 961                         return -1;
 962
 963                 /* has term for current event */
 964                 if ((overwrite < 0) && (set >= 0)) {
 965                         /* if it's first event, set overwrite */
 966                         if (evsel == perf_evlist__first(evlist))
 967                                 overwrite = set;
 968                         else
 969                                 return -1;
 970                 }
 971         }
 972
 973         if ((overwrite >= 0) && (opts->overwrite != overwrite))
 974                 opts->overwrite = overwrite;
 975
 976         return 0;
 977 }
 978
 979 static int perf_top_overwrite_fallback(struct perf_top *top,
 980                                        struct evsel *evsel)
 981 {
 982         struct record_opts *opts = &top->record_opts;
 983         struct evlist *evlist = top->evlist;
 984         struct evsel *counter;
 985
 986         if (!opts->overwrite)
 987                 return 0;
 988
 989         /* only fall back when first event fails */
 990         if (evsel != perf_evlist__first(evlist))
 991                 return 0;
 992
 993         evlist__for_each_entry(evlist, counter)
 994                 counter->core.attr.write_backward = false;
 995         opts->overwrite = false;
 996         pr_debug2("fall back to non-overwrite mode\n");
 997         return 1;
 998 }
 999
1000 static int perf_top__start_counters(struct perf_top *top)
1001 {
1002         char msg[BUFSIZ];
1003         struct evsel *counter;
1004         struct evlist *evlist = top->evlist;
1005         struct record_opts *opts = &top->record_opts;
1006
1007         if (perf_top__overwrite_check(top)) {
1008                 ui__error("perf top only support consistent per-event "
1009                           "overwrite setting for all events\n");
1010                 goto out_err;
1011         }
1012
1013         perf_evlist__config(evlist, opts, &callchain_param);
1014
1015         evlist__for_each_entry(evlist, counter) {
1016 try_again:
1017                 if (evsel__open(counter, top->evlist->core.cpus,
1018                                      top->evlist->core.threads) < 0) {
1019
1020                         /*
1021                          * Specially handle overwrite fall back.
1022                          * Because perf top is the only tool which has
1023                          * overwrite mode by default, support
1024                          * both overwrite and non-overwrite mode, and
1025                          * require consistent mode for all events.
1026                          *
1027                          * May move it to generic code with more tools
1028                          * have similar attribute.
1029                          */
1030                         if (perf_missing_features.write_backward &&
1031                             perf_top_overwrite_fallback(top, counter))
1032                                 goto try_again;
1033
1034                         if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
1035                                 if (verbose > 0)
1036                                         ui__warning("%s\n", msg);
1037                                 goto try_again;
1038                         }
1039
1040                         perf_evsel__open_strerror(counter, &opts->target,
1041                                                   errno, msg, sizeof(msg));
1042                         ui__error("%s\n", msg);
1043                         goto out_err;
1044                 }
1045         }
1046
1047         if (perf_evlist__mmap(evlist, opts->mmap_pages) < 0) {
1048                 ui__error("Failed to mmap with %d (%s)\n",
1049                             errno, str_error_r(errno, msg, sizeof(msg)));
1050                 goto out_err;
1051         }
1052
1053         return 0;
1054
1055 out_err:
1056         return -1;
1057 }
1058
1059 static int callchain_param__setup_sample_type(struct callchain_param *callchain)
1060 {
1061         if (callchain->mode != CHAIN_NONE) {
1062                 if (callchain_register_param(callchain) < 0) {
1063                         ui__error("Can't register callchain params.\n");
1064                         return -EINVAL;
1065                 }
1066         }
1067
1068         return 0;
1069 }
1070
1071 static struct ordered_events *rotate_queues(struct perf_top *top)
1072 {
1073         struct ordered_events *in = top->qe.in;
1074
1075         if (top->qe.in == &top->qe.data[1])
1076                 top->qe.in = &top->qe.data[0];
1077         else
1078                 top->qe.in = &top->qe.data[1];
1079
1080         return in;
1081 }
1082
1083 static void *process_thread(void *arg)
1084 {
1085         struct perf_top *top = arg;
1086
1087         while (!done) {
1088                 struct ordered_events *out, *in = top->qe.in;
1089
1090                 if (!in->nr_events) {
1091                         usleep(100);
1092                         continue;
1093                 }
1094
1095                 out = rotate_queues(top);
1096
1097                 pthread_mutex_lock(&top->qe.mutex);
1098                 top->qe.rotate = true;
1099                 pthread_cond_wait(&top->qe.cond, &top->qe.mutex);
1100                 pthread_mutex_unlock(&top->qe.mutex);
1101
1102                 if (ordered_events__flush(out, OE_FLUSH__TOP))
1103                         pr_err("failed to process events\n");
1104         }
1105
1106         return NULL;
1107 }
1108
1109 /*
1110  * Allow only 'top->delay_secs' seconds behind samples.
1111  */
1112 static int should_drop(struct ordered_event *qevent, struct perf_top *top)
1113 {
1114         union perf_event *event = qevent->event;
1115         u64 delay_timestamp;
1116
1117         if (event->header.type != PERF_RECORD_SAMPLE)
1118                 return false;
1119
1120         delay_timestamp = qevent->timestamp + top->delay_secs * NSEC_PER_SEC;
1121         return delay_timestamp < last_timestamp;
1122 }
1123
1124 static int deliver_event(struct ordered_events *qe,
1125                          struct ordered_event *qevent)
1126 {
1127         struct perf_top *top = qe->data;
1128         struct evlist *evlist = top->evlist;
1129         struct perf_session *session = top->session;
1130         union perf_event *event = qevent->event;
1131         struct perf_sample sample;
1132         struct evsel *evsel;
1133         struct machine *machine;
1134         int ret = -1;
1135
1136         if (should_drop(qevent, top)) {
1137                 top->drop++;
1138                 top->drop_total++;
1139                 return 0;
1140         }
1141
1142         ret = perf_evlist__parse_sample(evlist, event, &sample);
1143         if (ret) {
1144                 pr_err("Can't parse sample, err = %d\n", ret);
1145                 goto next_event;
1146         }
1147
1148         evsel = perf_evlist__id2evsel(session->evlist, sample.id);
1149         assert(evsel != NULL);
1150
1151         if (event->header.type == PERF_RECORD_SAMPLE) {
1152                 if (evswitch__discard(&top->evswitch, evsel))
1153                         return 0;
1154                 ++top->samples;
1155         }
1156
1157         switch (sample.cpumode) {
1158         case PERF_RECORD_MISC_USER:
1159                 ++top->us_samples;
1160                 if (top->hide_user_symbols)
1161                         goto next_event;
1162                 machine = &session->machines.host;
1163                 break;
1164         case PERF_RECORD_MISC_KERNEL:
1165                 ++top->kernel_samples;
1166                 if (top->hide_kernel_symbols)
1167                         goto next_event;
1168                 machine = &session->machines.host;
1169                 break;
1170         case PERF_RECORD_MISC_GUEST_KERNEL:
1171                 ++top->guest_kernel_samples;
1172                 machine = perf_session__find_machine(session,
1173                                                      sample.pid);
1174                 break;
1175         case PERF_RECORD_MISC_GUEST_USER:
1176                 ++top->guest_us_samples;
1177                 /*
1178                  * TODO: we don't process guest user from host side
1179                  * except simple counting.
1180                  */
1181                 goto next_event;
1182         default:
1183                 if (event->header.type == PERF_RECORD_SAMPLE)
1184                         goto next_event;
1185                 machine = &session->machines.host;
1186                 break;
1187         }
1188
1189         if (event->header.type == PERF_RECORD_SAMPLE) {
1190                 perf_event__process_sample(&top->tool, event, evsel,
1191                                            &sample, machine);
1192         } else if (event->header.type == PERF_RECORD_LOST) {
1193                 perf_top__process_lost(top, event, evsel);
1194         } else if (event->header.type == PERF_RECORD_LOST_SAMPLES) {
1195                 perf_top__process_lost_samples(top, event, evsel);
1196         } else if (event->header.type < PERF_RECORD_MAX) {
1197                 hists__inc_nr_events(evsel__hists(evsel), event->header.type);
1198                 machine__process_event(machine, event, &sample);
1199         } else
1200                 ++session->evlist->stats.nr_unknown_events;
1201
1202         ret = 0;
1203 next_event:
1204         return ret;
1205 }
1206
1207 static void init_process_thread(struct perf_top *top)
1208 {
1209         ordered_events__init(&top->qe.data[0], deliver_event, top);
1210         ordered_events__init(&top->qe.data[1], deliver_event, top);
1211         ordered_events__set_copy_on_queue(&top->qe.data[0], true);
1212         ordered_events__set_copy_on_queue(&top->qe.data[1], true);
1213         top->qe.in = &top->qe.data[0];
1214         pthread_mutex_init(&top->qe.mutex, NULL);
1215         pthread_cond_init(&top->qe.cond, NULL);
1216 }
1217
1218 static int __cmd_top(struct perf_top *top)
1219 {
1220         struct record_opts *opts = &top->record_opts;
1221         pthread_t thread, thread_process;
1222         int ret;
1223
1224         if (!top->annotation_opts.objdump_path) {
1225                 ret = perf_env__lookup_objdump(&top->session->header.env,
1226                                                &top->annotation_opts.objdump_path);
1227                 if (ret)
1228                         return ret;
1229         }
1230
1231         ret = callchain_param__setup_sample_type(&callchain_param);
1232         if (ret)
1233                 return ret;
1234
1235         if (perf_session__register_idle_thread(top->session) < 0)
1236                 return ret;
1237
1238         if (top->nr_threads_synthesize > 1)
1239                 perf_set_multithreaded();
1240
1241         init_process_thread(top);
1242
1243         if (opts->record_namespaces)
1244                 top->tool.namespace_events = true;
1245
1246         ret = perf_event__synthesize_bpf_events(top->session, perf_event__process,
1247                                                 &top->session->machines.host,
1248                                                 &top->record_opts);
1249         if (ret < 0)
1250                 pr_debug("Couldn't synthesize BPF events: Pre-existing BPF programs won't have symbols resolved.\n");
1251
1252         machine__synthesize_threads(&top->session->machines.host, &opts->target,
1253                                     top->evlist->core.threads, false,
1254                                     top->nr_threads_synthesize);
1255
1256         if (top->nr_threads_synthesize > 1)
1257                 perf_set_singlethreaded();
1258
1259         if (perf_hpp_list.socket) {
1260                 ret = perf_env__read_cpu_topology_map(&perf_env);
1261                 if (ret < 0) {
1262                         char errbuf[BUFSIZ];
1263                         const char *err = str_error_r(-ret, errbuf, sizeof(errbuf));
1264
1265                         ui__error("Could not read the CPU topology map: %s\n", err);
1266                         return ret;
1267                 }
1268         }
1269
1270         ret = perf_top__start_counters(top);
1271         if (ret)
1272                 return ret;
1273
1274         top->session->evlist = top->evlist;
1275         perf_session__set_id_hdr_size(top->session);
1276
1277         /*
1278          * When perf is starting the traced process, all the events (apart from
1279          * group members) have enable_on_exec=1 set, so don't spoil it by
1280          * prematurely enabling them.
1281          *
1282          * XXX 'top' still doesn't start workloads like record, trace, but should,
1283          * so leave the check here.
1284          */
1285         if (!target__none(&opts->target))
1286                 evlist__enable(top->evlist);
1287
1288         ret = -1;
1289         if (pthread_create(&thread_process, NULL, process_thread, top)) {
1290                 ui__error("Could not create process thread.\n");
1291                 return ret;
1292         }
1293
1294         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1295                                                             display_thread), top)) {
1296                 ui__error("Could not create display thread.\n");
1297                 goto out_join_thread;
1298         }
1299
1300         if (top->realtime_prio) {
1301                 struct sched_param param;
1302
1303                 param.sched_priority = top->realtime_prio;
1304                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1305                         ui__error("Could not set realtime priority.\n");
1306                         goto out_join;
1307                 }
1308         }
1309
1310         /* Wait for a minimal set of events before starting the snapshot */
1311         perf_evlist__poll(top->evlist, 100);
1312
1313         perf_top__mmap_read(top);
1314
1315         while (!done) {
1316                 u64 hits = top->samples;
1317
1318                 perf_top__mmap_read(top);
1319
1320                 if (opts->overwrite || (hits == top->samples))
1321                         ret = perf_evlist__poll(top->evlist, 100);
1322
1323                 if (resize) {
1324                         perf_top__resize(top);
1325                         resize = 0;
1326                 }
1327         }
1328
1329         ret = 0;
1330 out_join:
1331         pthread_join(thread, NULL);
1332 out_join_thread:
1333         pthread_cond_signal(&top->qe.cond);
1334         pthread_join(thread_process, NULL);
1335         return ret;
1336 }
1337
1338 static int
1339 callchain_opt(const struct option *opt, const char *arg, int unset)
1340 {
1341         symbol_conf.use_callchain = true;
1342         return record_callchain_opt(opt, arg, unset);
1343 }
1344
1345 static int
1346 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1347 {
1348         struct callchain_param *callchain = opt->value;
1349
1350         callchain->enabled = !unset;
1351         callchain->record_mode = CALLCHAIN_FP;
1352
1353         /*
1354          * --no-call-graph
1355          */
1356         if (unset) {
1357                 symbol_conf.use_callchain = false;
1358                 callchain->record_mode = CALLCHAIN_NONE;
1359                 return 0;
1360         }
1361
1362         return parse_callchain_top_opt(arg);
1363 }
1364
1365 static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
1366 {
1367         if (!strcmp(var, "top.call-graph")) {
1368                 var = "call-graph.record-mode";
1369                 return perf_default_config(var, value, cb);
1370         }
1371         if (!strcmp(var, "top.children")) {
1372                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
1373                 return 0;
1374         }
1375
1376         return 0;
1377 }
1378
1379 static int
1380 parse_percent_limit(const struct option *opt, const char *arg,
1381                     int unset __maybe_unused)
1382 {
1383         struct perf_top *top = opt->value;
1384
1385         top->min_percent = strtof(arg, NULL);
1386         return 0;
1387 }
1388
1389 const char top_callchain_help[] = CALLCHAIN_RECORD_HELP CALLCHAIN_REPORT_HELP
1390         "\n\t\t\t\tDefault: fp,graph,0.5,caller,function";
1391
1392 int cmd_top(int argc, const char **argv)
1393 {
1394         char errbuf[BUFSIZ];
1395         struct perf_top top = {
1396                 .count_filter        = 5,
1397                 .delay_secs          = 2,
1398                 .record_opts = {
1399                         .mmap_pages     = UINT_MAX,
1400                         .user_freq      = UINT_MAX,
1401                         .user_interval  = ULLONG_MAX,
1402                         .freq           = 4000, /* 4 KHz */
1403                         .target         = {
1404                                 .uses_mmap   = true,
1405                         },
1406                         /*
1407                          * FIXME: This will lose PERF_RECORD_MMAP and other metadata
1408                          * when we pause, fix that and reenable. Probably using a
1409                          * separate evlist with a dummy event, i.e. a non-overwrite
1410                          * ring buffer just for metadata events, while PERF_RECORD_SAMPLE
1411                          * stays in overwrite mode. -acme
1412                          * */
1413                         .overwrite      = 0,
1414                         .sample_time    = true,
1415                         .sample_time_set = true,
1416                 },
1417                 .max_stack           = sysctl__max_stack(),
1418                 .annotation_opts     = annotation__default_options,
1419                 .nr_threads_synthesize = UINT_MAX,
1420         };
1421         struct record_opts *opts = &top.record_opts;
1422         struct target *target = &opts->target;
1423         const struct option options[] = {
1424         OPT_CALLBACK('e', "event", &top.evlist, "event",
1425                      "event selector. use 'perf list' to list available events",
1426                      parse_events_option),
1427         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1428         OPT_STRING('p', "pid", &target->pid, "pid",
1429                     "profile events on existing process id"),
1430         OPT_STRING('t', "tid", &target->tid, "tid",
1431                     "profile events on existing thread id"),
1432         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1433                             "system-wide collection from all CPUs"),
1434         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1435                     "list of cpus to monitor"),
1436         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1437                    "file", "vmlinux pathname"),
1438         OPT_BOOLEAN(0, "ignore-vmlinux", &symbol_conf.ignore_vmlinux,
1439                     "don't load vmlinux even if found"),
1440         OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
1441                    "file", "kallsyms pathname"),
1442         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1443                     "hide kernel symbols"),
1444         OPT_CALLBACK('m', "mmap-pages", &opts->mmap_pages, "pages",
1445                      "number of mmap data pages",
1446                      perf_evlist__parse_mmap_pages),
1447         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1448                     "collect data with this RT SCHED_FIFO priority"),
1449         OPT_INTEGER('d', "delay", &top.delay_secs,
1450                     "number of seconds to delay between refreshes"),
1451         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1452                             "dump the symbol table used for profiling"),
1453         OPT_INTEGER('f', "count-filter", &top.count_filter,
1454                     "only display functions with more events than this"),
1455         OPT_BOOLEAN(0, "group", &opts->group,
1456                             "put the counters into a counter group"),
1457         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1458                     "child tasks do not inherit counters"),
1459         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1460                     "symbol to annotate"),
1461         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1462         OPT_CALLBACK('F', "freq", &top.record_opts, "freq or 'max'",
1463                      "profile at this frequency",
1464                       record__parse_freq),
1465         OPT_INTEGER('E', "entries", &top.print_entries,
1466                     "display this many functions"),
1467         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1468                     "hide user symbols"),
1469         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1470         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1471         OPT_INCR('v', "verbose", &verbose,
1472                     "be more verbose (show counter open errors, etc)"),
1473         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1474                    "sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ..."
1475                    " Please refer the man page for the complete list."),
1476         OPT_STRING(0, "fields", &field_order, "key[,keys...]",
1477                    "output field(s): overhead, period, sample plus all of sort keys"),
1478         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1479                     "Show a column with the number of samples"),
1480         OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1481                            NULL, "enables call-graph recording and display",
1482                            &callchain_opt),
1483         OPT_CALLBACK(0, "call-graph", &callchain_param,
1484                      "record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]",
1485                      top_callchain_help, &parse_callchain_opt),
1486         OPT_BOOLEAN(0, "children", &symbol_conf.cumulate_callchain,
1487                     "Accumulate callchains of children and show total overhead as well"),
1488         OPT_INTEGER(0, "max-stack", &top.max_stack,
1489                     "Set the maximum stack depth when parsing the callchain. "
1490                     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
1491         OPT_CALLBACK(0, "ignore-callees", NULL, "regex",
1492                    "ignore callees of these functions in call graphs",
1493                    report_parse_ignore_callees_opt),
1494         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1495                     "Show a column with the sum of periods"),
1496         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1497                    "only consider symbols in these dsos"),
1498         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1499                    "only consider symbols in these comms"),
1500         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1501                    "only consider these symbols"),
1502         OPT_BOOLEAN(0, "source", &top.annotation_opts.annotate_src,
1503                     "Interleave source code with assembly code (default)"),
1504         OPT_BOOLEAN(0, "asm-raw", &top.annotation_opts.show_asm_raw,
1505                     "Display raw encoding of assembly instructions (default)"),
1506         OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
1507                     "Enable kernel symbol demangling"),
1508         OPT_BOOLEAN(0, "no-bpf-event", &top.record_opts.no_bpf_event, "do not record bpf events"),
1509         OPT_STRING(0, "objdump", &top.annotation_opts.objdump_path, "path",
1510                     "objdump binary to use for disassembly and annotations"),
1511         OPT_STRING('M', "disassembler-style", &top.annotation_opts.disassembler_style, "disassembler style",
1512                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1513         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1514         OPT_CALLBACK(0, "percent-limit", &top, "percent",
1515                      "Don't show entries under that percent", parse_percent_limit),
1516         OPT_CALLBACK(0, "percentage", NULL, "relative|absolute",
1517                      "How to display percentage of filtered entries", parse_filter_percentage),
1518         OPT_STRING('w', "column-widths", &symbol_conf.col_width_list_str,
1519                    "width[,width...]",
1520                    "don't try to adjust column width, use these fixed values"),
1521         OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1522                         "per thread proc mmap processing timeout in ms"),
1523         OPT_CALLBACK_NOOPT('b', "branch-any", &opts->branch_stack,
1524                      "branch any", "sample any taken branches",
1525                      parse_branch_stack),
1526         OPT_CALLBACK('j', "branch-filter", &opts->branch_stack,
1527                      "branch filter mask", "branch stack filter modes",
1528                      parse_branch_stack),
1529         OPT_BOOLEAN(0, "raw-trace", &symbol_conf.raw_trace,
1530                     "Show raw trace event output (do not use print fmt or plugins)"),
1531         OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
1532                     "Show entries in a hierarchy"),
1533         OPT_BOOLEAN(0, "overwrite", &top.record_opts.overwrite,
1534                     "Use a backward ring buffer, default: no"),
1535         OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
1536         OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
1537                         "number of thread to run event synthesize"),
1538         OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces,
1539                     "Record namespaces events"),
1540         OPTS_EVSWITCH(&top.evswitch),
1541         OPT_END()
1542         };
1543         struct evlist *sb_evlist = NULL;
1544         const char * const top_usage[] = {
1545                 "perf top [<options>]",
1546                 NULL
1547         };
1548         int status = hists__init();
1549
1550         if (status < 0)
1551                 return status;
1552
1553         top.annotation_opts.min_pcnt = 5;
1554         top.annotation_opts.context  = 4;
1555
1556         top.evlist = evlist__new();
1557         if (top.evlist == NULL)
1558                 return -ENOMEM;
1559
1560         status = perf_config(perf_top_config, &top);
1561         if (status)
1562                 return status;
1563
1564         argc = parse_options(argc, argv, options, top_usage, 0);
1565         if (argc)
1566                 usage_with_options(top_usage, options);
1567
1568         if (!top.evlist->core.nr_entries &&
1569             perf_evlist__add_default(top.evlist) < 0) {
1570                 pr_err("Not enough memory for event selector list\n");
1571                 goto out_delete_evlist;
1572         }
1573
1574         status = evswitch__init(&top.evswitch, top.evlist, stderr);
1575         if (status)
1576                 goto out_delete_evlist;
1577
1578         if (symbol_conf.report_hierarchy) {
1579                 /* disable incompatible options */
1580                 symbol_conf.event_group = false;
1581                 symbol_conf.cumulate_callchain = false;
1582
1583                 if (field_order) {
1584                         pr_err("Error: --hierarchy and --fields options cannot be used together\n");
1585                         parse_options_usage(top_usage, options, "fields", 0);
1586                         parse_options_usage(NULL, options, "hierarchy", 0);
1587                         goto out_delete_evlist;
1588                 }
1589         }
1590
1591         if (opts->branch_stack && callchain_param.enabled)
1592                 symbol_conf.show_branchflag_count = true;
1593
1594         sort__mode = SORT_MODE__TOP;
1595         /* display thread wants entries to be collapsed in a different tree */
1596         perf_hpp_list.need_collapse = 1;
1597
1598         if (top.use_stdio)
1599                 use_browser = 0;
1600         else if (top.use_tui)
1601                 use_browser = 1;
1602
1603         setup_browser(false);
1604
1605         if (setup_sorting(top.evlist) < 0) {
1606                 if (sort_order)
1607                         parse_options_usage(top_usage, options, "s", 1);
1608                 if (field_order)
1609                         parse_options_usage(sort_order ? NULL : top_usage,
1610                                             options, "fields", 0);
1611                 goto out_delete_evlist;
1612         }
1613
1614         status = target__validate(target);
1615         if (status) {
1616                 target__strerror(target, status, errbuf, BUFSIZ);
1617                 ui__warning("%s\n", errbuf);
1618         }
1619
1620         status = target__parse_uid(target);
1621         if (status) {
1622                 int saved_errno = errno;
1623
1624                 target__strerror(target, status, errbuf, BUFSIZ);
1625                 ui__error("%s\n", errbuf);
1626
1627                 status = -saved_errno;
1628                 goto out_delete_evlist;
1629         }
1630
1631         if (target__none(target))
1632                 target->system_wide = true;
1633
1634         if (perf_evlist__create_maps(top.evlist, target) < 0) {
1635                 ui__error("Couldn't create thread/CPU maps: %s\n",
1636                           errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
1637                 goto out_delete_evlist;
1638         }
1639
1640         if (top.delay_secs < 1)
1641                 top.delay_secs = 1;
1642
1643         if (record_opts__config(opts)) {
1644                 status = -EINVAL;
1645                 goto out_delete_evlist;
1646         }
1647
1648         top.sym_evsel = perf_evlist__first(top.evlist);
1649
1650         if (!callchain_param.enabled) {
1651                 symbol_conf.cumulate_callchain = false;
1652                 perf_hpp__cancel_cumulate();
1653         }
1654
1655         if (symbol_conf.cumulate_callchain && !callchain_param.order_set)
1656                 callchain_param.order = ORDER_CALLER;
1657
1658         status = symbol__annotation_init();
1659         if (status < 0)
1660                 goto out_delete_evlist;
1661
1662         annotation_config__init();
1663
1664         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1665         status = symbol__init(NULL);
1666         if (status < 0)
1667                 goto out_delete_evlist;
1668
1669         sort__setup_elide(stdout);
1670
1671         get_term_dimensions(&top.winsize);
1672         if (top.print_entries == 0) {
1673                 perf_top__update_print_entries(&top);
1674                 signal(SIGWINCH, winch_sig);
1675         }
1676
1677         top.session = perf_session__new(NULL, false, NULL);
1678         if (top.session == NULL) {
1679                 status = -1;
1680                 goto out_delete_evlist;
1681         }
1682
1683         if (!top.record_opts.no_bpf_event)
1684                 bpf_event__add_sb_event(&sb_evlist, &perf_env);
1685
1686         if (perf_evlist__start_sb_thread(sb_evlist, target)) {
1687                 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1688                 opts->no_bpf_event = true;
1689         }
1690
1691         status = __cmd_top(&top);
1692
1693         if (!opts->no_bpf_event)
1694                 perf_evlist__stop_sb_thread(sb_evlist);
1695
1696 out_delete_evlist:
1697         evlist__delete(top.evlist);
1698         perf_session__delete(top.session);
1699
1700         return status;
1701 }