Pileus Git - ~andy/linux/blob - tools/perf/builtin-top.c

   1 /*
   2  * builtin-top.c
   3  *
   4  * Builtin top command: Display a continuously updated profile of
   5  * any workload, CPU or specific PID.
   6  *
   7  * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
   8  *               2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   9  *
  10  * Improvements and fixes by:
  11  *
  12  *   Arjan van de Ven <arjan@linux.intel.com>
  13  *   Yanmin Zhang <yanmin.zhang@intel.com>
  14  *   Wu Fengguang <fengguang.wu@intel.com>
  15  *   Mike Galbraith <efault@gmx.de>
  16  *   Paul Mackerras <paulus@samba.org>
  17  *
  18  * Released under the GPL v2. (and only v2, not any later version)
  19  */
  20 #include "builtin.h"
  21
  22 #include "perf.h"
  23
  24 #include "util/annotate.h"
  25 #include "util/cache.h"
  26 #include "util/color.h"
  27 #include "util/evlist.h"
  28 #include "util/evsel.h"
  29 #include "util/machine.h"
  30 #include "util/session.h"
  31 #include "util/symbol.h"
  32 #include "util/thread.h"
  33 #include "util/thread_map.h"
  34 #include "util/top.h"
  35 #include "util/util.h"
  36 #include <linux/rbtree.h>
  37 #include "util/parse-options.h"
  38 #include "util/parse-events.h"
  39 #include "util/cpumap.h"
  40 #include "util/xyarray.h"
  41 #include "util/sort.h"
  42 #include "util/intlist.h"
  43
  44 #include "util/debug.h"
  45
  46 #include <assert.h>
  47 #include <elf.h>
  48 #include <fcntl.h>
  49
  50 #include <stdio.h>
  51 #include <termios.h>
  52 #include <unistd.h>
  53 #include <inttypes.h>
  54
  55 #include <errno.h>
  56 #include <time.h>
  57 #include <sched.h>
  58
  59 #include <sys/syscall.h>
  60 #include <sys/ioctl.h>
  61 #include <sys/poll.h>
  62 #include <sys/prctl.h>
  63 #include <sys/wait.h>
  64 #include <sys/uio.h>
  65 #include <sys/utsname.h>
  66 #include <sys/mman.h>
  67
  68 #include <linux/unistd.h>
  69 #include <linux/types.h>
  70
  71 void get_term_dimensions(struct winsize *ws)
  72 {
  73         char *s = getenv("LINES");
  74
  75         if (s != NULL) {
  76                 ws->ws_row = atoi(s);
  77                 s = getenv("COLUMNS");
  78                 if (s != NULL) {
  79                         ws->ws_col = atoi(s);
  80                         if (ws->ws_row && ws->ws_col)
  81                                 return;
  82                 }
  83         }
  84 #ifdef TIOCGWINSZ
  85         if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
  86             ws->ws_row && ws->ws_col)
  87                 return;
  88 #endif
  89         ws->ws_row = 25;
  90         ws->ws_col = 80;
  91 }
  92
  93 static void perf_top__update_print_entries(struct perf_top *top)
  94 {
  95         if (top->print_entries > 9)
  96                 top->print_entries -= 9;
  97 }
  98
  99 static void perf_top__sig_winch(int sig __maybe_unused,
 100                                 siginfo_t *info __maybe_unused, void *arg)
 101 {
 102         struct perf_top *top = arg;
 103
 104         get_term_dimensions(&top->winsize);
 105         if (!top->print_entries
 106             || (top->print_entries+4) > top->winsize.ws_row) {
 107                 top->print_entries = top->winsize.ws_row;
 108         } else {
 109                 top->print_entries += 4;
 110                 top->winsize.ws_row = top->print_entries;
 111         }
 112         perf_top__update_print_entries(top);
 113 }
 114
 115 static int perf_top__parse_source(struct perf_top *top, struct hist_entry *he)
 116 {
 117         struct symbol *sym;
 118         struct annotation *notes;
 119         struct map *map;
 120         int err = -1;
 121
 122         if (!he || !he->ms.sym)
 123                 return -1;
 124
 125         sym = he->ms.sym;
 126         map = he->ms.map;
 127
 128         /*
 129          * We can't annotate with just /proc/kallsyms
 130          */
 131         if (map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
 132                 pr_err("Can't annotate %s: No vmlinux file was found in the "
 133                        "path\n", sym->name);
 134                 sleep(1);
 135                 return -1;
 136         }
 137
 138         notes = symbol__annotation(sym);
 139         if (notes->src != NULL) {
 140                 pthread_mutex_lock(&notes->lock);
 141                 goto out_assign;
 142         }
 143
 144         pthread_mutex_lock(&notes->lock);
 145
 146         if (symbol__alloc_hist(sym) < 0) {
 147                 pthread_mutex_unlock(&notes->lock);
 148                 pr_err("Not enough memory for annotating '%s' symbol!\n",
 149                        sym->name);
 150                 sleep(1);
 151                 return err;
 152         }
 153
 154         err = symbol__annotate(sym, map, 0);
 155         if (err == 0) {
 156 out_assign:
 157                 top->sym_filter_entry = he;
 158         }
 159
 160         pthread_mutex_unlock(&notes->lock);
 161         return err;
 162 }
 163
 164 static void __zero_source_counters(struct hist_entry *he)
 165 {
 166         struct symbol *sym = he->ms.sym;
 167         symbol__annotate_zero_histograms(sym);
 168 }
 169
 170 static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
 171 {
 172         struct utsname uts;
 173         int err = uname(&uts);
 174
 175         ui__warning("Out of bounds address found:\n\n"
 176                     "Addr:   %" PRIx64 "\n"
 177                     "DSO:    %s %c\n"
 178                     "Map:    %" PRIx64 "-%" PRIx64 "\n"
 179                     "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
 180                     "Arch:   %s\n"
 181                     "Kernel: %s\n"
 182                     "Tools:  %s\n\n"
 183                     "Not all samples will be on the annotation output.\n\n"
 184                     "Please report to linux-kernel@vger.kernel.org\n",
 185                     ip, map->dso->long_name, dso__symtab_origin(map->dso),
 186                     map->start, map->end, sym->start, sym->end,
 187                     sym->binding == STB_GLOBAL ? 'g' :
 188                     sym->binding == STB_LOCAL  ? 'l' : 'w', sym->name,
 189                     err ? "[unknown]" : uts.machine,
 190                     err ? "[unknown]" : uts.release, perf_version_string);
 191         if (use_browser <= 0)
 192                 sleep(5);
 193
 194         map->erange_warned = true;
 195 }
 196
 197 static void perf_top__record_precise_ip(struct perf_top *top,
 198                                         struct hist_entry *he,
 199                                         int counter, u64 ip)
 200 {
 201         struct annotation *notes;
 202         struct symbol *sym;
 203         int err;
 204
 205         if (he == NULL || he->ms.sym == NULL ||
 206             ((top->sym_filter_entry == NULL ||
 207               top->sym_filter_entry->ms.sym != he->ms.sym) && use_browser != 1))
 208                 return;
 209
 210         sym = he->ms.sym;
 211         notes = symbol__annotation(sym);
 212
 213         if (pthread_mutex_trylock(&notes->lock))
 214                 return;
 215
 216         if (notes->src == NULL && symbol__alloc_hist(sym) < 0) {
 217                 pthread_mutex_unlock(&notes->lock);
 218                 pr_err("Not enough memory for annotating '%s' symbol!\n",
 219                        sym->name);
 220                 sleep(1);
 221                 return;
 222         }
 223
 224         ip = he->ms.map->map_ip(he->ms.map, ip);
 225         err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
 226
 227         pthread_mutex_unlock(&notes->lock);
 228
 229         if (err == -ERANGE && !he->ms.map->erange_warned)
 230                 ui__warn_map_erange(he->ms.map, sym, ip);
 231 }
 232
 233 static void perf_top__show_details(struct perf_top *top)
 234 {
 235         struct hist_entry *he = top->sym_filter_entry;
 236         struct annotation *notes;
 237         struct symbol *symbol;
 238         int more;
 239
 240         if (!he)
 241                 return;
 242
 243         symbol = he->ms.sym;
 244         notes = symbol__annotation(symbol);
 245
 246         pthread_mutex_lock(&notes->lock);
 247
 248         if (notes->src == NULL)
 249                 goto out_unlock;
 250
 251         printf("Showing %s for %s\n", perf_evsel__name(top->sym_evsel), symbol->name);
 252         printf("  Events  Pcnt (>=%d%%)\n", top->sym_pcnt_filter);
 253
 254         more = symbol__annotate_printf(symbol, he->ms.map, top->sym_evsel->idx,
 255                                        0, top->sym_pcnt_filter, top->print_entries, 4);
 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         if (more != 0)
 261                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 262 out_unlock:
 263         pthread_mutex_unlock(&notes->lock);
 264 }
 265
 266 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
 267
 268 static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
 269                                                      struct addr_location *al,
 270                                                      struct perf_sample *sample)
 271 {
 272         struct hist_entry *he;
 273
 274         he = __hists__add_entry(&evsel->hists, al, NULL, sample->period);
 275         if (he == NULL)
 276                 return NULL;
 277
 278         hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
 279         return he;
 280 }
 281
 282 static void perf_top__print_sym_table(struct perf_top *top)
 283 {
 284         char bf[160];
 285         int printed = 0;
 286         const int win_width = top->winsize.ws_col - 1;
 287
 288         puts(CONSOLE_CLEAR);
 289
 290         perf_top__header_snprintf(top, bf, sizeof(bf));
 291         printf("%s\n", bf);
 292
 293         perf_top__reset_sample_counters(top);
 294
 295         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 296
 297         if (top->sym_evsel->hists.stats.nr_lost_warned !=
 298             top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST]) {
 299                 top->sym_evsel->hists.stats.nr_lost_warned =
 300                         top->sym_evsel->hists.stats.nr_events[PERF_RECORD_LOST];
 301                 color_fprintf(stdout, PERF_COLOR_RED,
 302                               "WARNING: LOST %d chunks, Check IO/CPU overload",
 303                               top->sym_evsel->hists.stats.nr_lost_warned);
 304                 ++printed;
 305         }
 306
 307         if (top->sym_filter_entry) {
 308                 perf_top__show_details(top);
 309                 return;
 310         }
 311
 312         hists__collapse_resort_threaded(&top->sym_evsel->hists);
 313         hists__output_resort_threaded(&top->sym_evsel->hists);
 314         hists__decay_entries_threaded(&top->sym_evsel->hists,
 315                                       top->hide_user_symbols,
 316                                       top->hide_kernel_symbols);
 317         hists__output_recalc_col_len(&top->sym_evsel->hists,
 318                                      top->winsize.ws_row - 3);
 319         putchar('\n');
 320         hists__fprintf(&top->sym_evsel->hists, false,
 321                        top->winsize.ws_row - 4 - printed, win_width, stdout);
 322 }
 323
 324 static void prompt_integer(int *target, const char *msg)
 325 {
 326         char *buf = malloc(0), *p;
 327         size_t dummy = 0;
 328         int tmp;
 329
 330         fprintf(stdout, "\n%s: ", msg);
 331         if (getline(&buf, &dummy, stdin) < 0)
 332                 return;
 333
 334         p = strchr(buf, '\n');
 335         if (p)
 336                 *p = 0;
 337
 338         p = buf;
 339         while(*p) {
 340                 if (!isdigit(*p))
 341                         goto out_free;
 342                 p++;
 343         }
 344         tmp = strtoul(buf, NULL, 10);
 345         *target = tmp;
 346 out_free:
 347         free(buf);
 348 }
 349
 350 static void prompt_percent(int *target, const char *msg)
 351 {
 352         int tmp = 0;
 353
 354         prompt_integer(&tmp, msg);
 355         if (tmp >= 0 && tmp <= 100)
 356                 *target = tmp;
 357 }
 358
 359 static void perf_top__prompt_symbol(struct perf_top *top, const char *msg)
 360 {
 361         char *buf = malloc(0), *p;
 362         struct hist_entry *syme = top->sym_filter_entry, *n, *found = NULL;
 363         struct rb_node *next;
 364         size_t dummy = 0;
 365
 366         /* zero counters of active symbol */
 367         if (syme) {
 368                 __zero_source_counters(syme);
 369                 top->sym_filter_entry = NULL;
 370         }
 371
 372         fprintf(stdout, "\n%s: ", msg);
 373         if (getline(&buf, &dummy, stdin) < 0)
 374                 goto out_free;
 375
 376         p = strchr(buf, '\n');
 377         if (p)
 378                 *p = 0;
 379
 380         next = rb_first(&top->sym_evsel->hists.entries);
 381         while (next) {
 382                 n = rb_entry(next, struct hist_entry, rb_node);
 383                 if (n->ms.sym && !strcmp(buf, n->ms.sym->name)) {
 384                         found = n;
 385                         break;
 386                 }
 387                 next = rb_next(&n->rb_node);
 388         }
 389
 390         if (!found) {
 391                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
 392                 sleep(1);
 393         } else
 394                 perf_top__parse_source(top, found);
 395
 396 out_free:
 397         free(buf);
 398 }
 399
 400 static void perf_top__print_mapped_keys(struct perf_top *top)
 401 {
 402         char *name = NULL;
 403
 404         if (top->sym_filter_entry) {
 405                 struct symbol *sym = top->sym_filter_entry->ms.sym;
 406                 name = sym->name;
 407         }
 408
 409         fprintf(stdout, "\nMapped keys:\n");
 410         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", top->delay_secs);
 411         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", top->print_entries);
 412
 413         if (top->evlist->nr_entries > 1)
 414                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", perf_evsel__name(top->sym_evsel));
 415
 416         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", top->count_filter);
 417
 418         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", top->sym_pcnt_filter);
 419         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 420         fprintf(stdout, "\t[S]     stop annotation.\n");
 421
 422         fprintf(stdout,
 423                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
 424                 top->hide_kernel_symbols ? "yes" : "no");
 425         fprintf(stdout,
 426                 "\t[U]     hide user symbols.               \t(%s)\n",
 427                 top->hide_user_symbols ? "yes" : "no");
 428         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", top->zero ? 1 : 0);
 429         fprintf(stdout, "\t[qQ]    quit.\n");
 430 }
 431
 432 static int perf_top__key_mapped(struct perf_top *top, int c)
 433 {
 434         switch (c) {
 435                 case 'd':
 436                 case 'e':
 437                 case 'f':
 438                 case 'z':
 439                 case 'q':
 440                 case 'Q':
 441                 case 'K':
 442                 case 'U':
 443                 case 'F':
 444                 case 's':
 445                 case 'S':
 446                         return 1;
 447                 case 'E':
 448                         return top->evlist->nr_entries > 1 ? 1 : 0;
 449                 default:
 450                         break;
 451         }
 452
 453         return 0;
 454 }
 455
 456 static void perf_top__handle_keypress(struct perf_top *top, int c)
 457 {
 458         if (!perf_top__key_mapped(top, c)) {
 459                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 460                 struct termios tc, save;
 461
 462                 perf_top__print_mapped_keys(top);
 463                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 464                 fflush(stdout);
 465
 466                 tcgetattr(0, &save);
 467                 tc = save;
 468                 tc.c_lflag &= ~(ICANON | ECHO);
 469                 tc.c_cc[VMIN] = 0;
 470                 tc.c_cc[VTIME] = 0;
 471                 tcsetattr(0, TCSANOW, &tc);
 472
 473                 poll(&stdin_poll, 1, -1);
 474                 c = getc(stdin);
 475
 476                 tcsetattr(0, TCSAFLUSH, &save);
 477                 if (!perf_top__key_mapped(top, c))
 478                         return;
 479         }
 480
 481         switch (c) {
 482                 case 'd':
 483                         prompt_integer(&top->delay_secs, "Enter display delay");
 484                         if (top->delay_secs < 1)
 485                                 top->delay_secs = 1;
 486                         break;
 487                 case 'e':
 488                         prompt_integer(&top->print_entries, "Enter display entries (lines)");
 489                         if (top->print_entries == 0) {
 490                                 struct sigaction act = {
 491                                         .sa_sigaction = perf_top__sig_winch,
 492                                         .sa_flags     = SA_SIGINFO,
 493                                 };
 494                                 perf_top__sig_winch(SIGWINCH, NULL, top);
 495                                 sigaction(SIGWINCH, &act, NULL);
 496                         } else {
 497                                 perf_top__sig_winch(SIGWINCH, NULL, top);
 498                                 signal(SIGWINCH, SIG_DFL);
 499                         }
 500                         break;
 501                 case 'E':
 502                         if (top->evlist->nr_entries > 1) {
 503                                 /* Select 0 as the default event: */
 504                                 int counter = 0;
 505
 506                                 fprintf(stderr, "\nAvailable events:");
 507
 508                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 509                                         fprintf(stderr, "\n\t%d %s", top->sym_evsel->idx, perf_evsel__name(top->sym_evsel));
 510
 511                                 prompt_integer(&counter, "Enter details event counter");
 512
 513                                 if (counter >= top->evlist->nr_entries) {
 514                                         top->sym_evsel = perf_evlist__first(top->evlist);
 515                                         fprintf(stderr, "Sorry, no such event, using %s.\n", perf_evsel__name(top->sym_evsel));
 516                                         sleep(1);
 517                                         break;
 518                                 }
 519                                 list_for_each_entry(top->sym_evsel, &top->evlist->entries, node)
 520                                         if (top->sym_evsel->idx == counter)
 521                                                 break;
 522                         } else
 523                                 top->sym_evsel = perf_evlist__first(top->evlist);
 524                         break;
 525                 case 'f':
 526                         prompt_integer(&top->count_filter, "Enter display event count filter");
 527                         break;
 528                 case 'F':
 529                         prompt_percent(&top->sym_pcnt_filter,
 530                                        "Enter details display event filter (percent)");
 531                         break;
 532                 case 'K':
 533                         top->hide_kernel_symbols = !top->hide_kernel_symbols;
 534                         break;
 535                 case 'q':
 536                 case 'Q':
 537                         printf("exiting.\n");
 538                         if (top->dump_symtab)
 539                                 perf_session__fprintf_dsos(top->session, stderr);
 540                         exit(0);
 541                 case 's':
 542                         perf_top__prompt_symbol(top, "Enter details symbol");
 543                         break;
 544                 case 'S':
 545                         if (!top->sym_filter_entry)
 546                                 break;
 547                         else {
 548                                 struct hist_entry *syme = top->sym_filter_entry;
 549
 550                                 top->sym_filter_entry = NULL;
 551                                 __zero_source_counters(syme);
 552                         }
 553                         break;
 554                 case 'U':
 555                         top->hide_user_symbols = !top->hide_user_symbols;
 556                         break;
 557                 case 'z':
 558                         top->zero = !top->zero;
 559                         break;
 560                 default:
 561                         break;
 562         }
 563 }
 564
 565 static void perf_top__sort_new_samples(void *arg)
 566 {
 567         struct perf_top *t = arg;
 568         perf_top__reset_sample_counters(t);
 569
 570         if (t->evlist->selected != NULL)
 571                 t->sym_evsel = t->evlist->selected;
 572
 573         hists__collapse_resort_threaded(&t->sym_evsel->hists);
 574         hists__output_resort_threaded(&t->sym_evsel->hists);
 575         hists__decay_entries_threaded(&t->sym_evsel->hists,
 576                                       t->hide_user_symbols,
 577                                       t->hide_kernel_symbols);
 578 }
 579
 580 static void *display_thread_tui(void *arg)
 581 {
 582         struct perf_evsel *pos;
 583         struct perf_top *top = arg;
 584         const char *help = "For a higher level overview, try: perf top --sort comm,dso";
 585         struct hist_browser_timer hbt = {
 586                 .timer          = perf_top__sort_new_samples,
 587                 .arg            = top,
 588                 .refresh        = top->delay_secs,
 589         };
 590
 591         perf_top__sort_new_samples(top);
 592
 593         /*
 594          * Initialize the uid_filter_str, in the future the TUI will allow
 595          * Zooming in/out UIDs. For now juse use whatever the user passed
 596          * via --uid.
 597          */
 598         list_for_each_entry(pos, &top->evlist->entries, node)
 599                 pos->hists.uid_filter_str = top->record_opts.target.uid_str;
 600
 601         perf_evlist__tui_browse_hists(top->evlist, help, &hbt,
 602                                       &top->session->header.env);
 603
 604         exit_browser(0);
 605         exit(0);
 606         return NULL;
 607 }
 608
 609 static void *display_thread(void *arg)
 610 {
 611         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 612         struct termios tc, save;
 613         struct perf_top *top = arg;
 614         int delay_msecs, c;
 615
 616         tcgetattr(0, &save);
 617         tc = save;
 618         tc.c_lflag &= ~(ICANON | ECHO);
 619         tc.c_cc[VMIN] = 0;
 620         tc.c_cc[VTIME] = 0;
 621
 622         pthread__unblock_sigwinch();
 623 repeat:
 624         delay_msecs = top->delay_secs * 1000;
 625         tcsetattr(0, TCSANOW, &tc);
 626         /* trash return*/
 627         getc(stdin);
 628
 629         while (1) {
 630                 perf_top__print_sym_table(top);
 631                 /*
 632                  * Either timeout expired or we got an EINTR due to SIGWINCH,
 633                  * refresh screen in both cases.
 634                  */
 635                 switch (poll(&stdin_poll, 1, delay_msecs)) {
 636                 case 0:
 637                         continue;
 638                 case -1:
 639                         if (errno == EINTR)
 640                                 continue;
 641                         /* Fall trhu */
 642                 default:
 643                         goto process_hotkey;
 644                 }
 645         }
 646 process_hotkey:
 647         c = getc(stdin);
 648         tcsetattr(0, TCSAFLUSH, &save);
 649
 650         perf_top__handle_keypress(top, c);
 651         goto repeat;
 652
 653         return NULL;
 654 }
 655
 656 /* Tag samples to be skipped. */
 657 static const char *skip_symbols[] = {
 658         "intel_idle",
 659         "default_idle",
 660         "native_safe_halt",
 661         "cpu_idle",
 662         "enter_idle",
 663         "exit_idle",
 664         "mwait_idle",
 665         "mwait_idle_with_hints",
 666         "poll_idle",
 667         "ppc64_runlatch_off",
 668         "pseries_dedicated_idle_sleep",
 669         NULL
 670 };
 671
 672 static int symbol_filter(struct map *map __maybe_unused, struct symbol *sym)
 673 {
 674         const char *name = sym->name;
 675         int i;
 676
 677         /*
 678          * ppc64 uses function descriptors and appends a '.' to the
 679          * start of every instruction address. Remove it.
 680          */
 681         if (name[0] == '.')
 682                 name++;
 683
 684         if (!strcmp(name, "_text") ||
 685             !strcmp(name, "_etext") ||
 686             !strcmp(name, "_sinittext") ||
 687             !strncmp("init_module", name, 11) ||
 688             !strncmp("cleanup_module", name, 14) ||
 689             strstr(name, "_text_start") ||
 690             strstr(name, "_text_end"))
 691                 return 1;
 692
 693         for (i = 0; skip_symbols[i]; i++) {
 694                 if (!strcmp(skip_symbols[i], name)) {
 695                         sym->ignore = true;
 696                         break;
 697                 }
 698         }
 699
 700         return 0;
 701 }
 702
 703 static void perf_event__process_sample(struct perf_tool *tool,
 704                                        const union perf_event *event,
 705                                        struct perf_evsel *evsel,
 706                                        struct perf_sample *sample,
 707                                        struct machine *machine)
 708 {
 709         struct perf_top *top = container_of(tool, struct perf_top, tool);
 710         struct symbol *parent = NULL;
 711         u64 ip = event->ip.ip;
 712         struct addr_location al;
 713         int err;
 714
 715         if (!machine && perf_guest) {
 716                 static struct intlist *seen;
 717
 718                 if (!seen)
 719                         seen = intlist__new();
 720
 721                 if (!intlist__has_entry(seen, event->ip.pid)) {
 722                         pr_err("Can't find guest [%d]'s kernel information\n",
 723                                 event->ip.pid);
 724                         intlist__add(seen, event->ip.pid);
 725                 }
 726                 return;
 727         }
 728
 729         if (!machine) {
 730                 pr_err("%u unprocessable samples recorded.\n",
 731                        top->session->hists.stats.nr_unprocessable_samples++);
 732                 return;
 733         }
 734
 735         if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
 736                 top->exact_samples++;
 737
 738         if (perf_event__preprocess_sample(event, machine, &al, sample,
 739                                           symbol_filter) < 0 ||
 740             al.filtered)
 741                 return;
 742
 743         if (!top->kptr_restrict_warned &&
 744             symbol_conf.kptr_restrict &&
 745             al.cpumode == PERF_RECORD_MISC_KERNEL) {
 746                 ui__warning(
 747 "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
 748 "Check /proc/sys/kernel/kptr_restrict.\n\n"
 749 "Kernel%s samples will not be resolved.\n",
 750                           !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
 751                           " modules" : "");
 752                 if (use_browser <= 0)
 753                         sleep(5);
 754                 top->kptr_restrict_warned = true;
 755         }
 756
 757         if (al.sym == NULL) {
 758                 const char *msg = "Kernel samples will not be resolved.\n";
 759                 /*
 760                  * As we do lazy loading of symtabs we only will know if the
 761                  * specified vmlinux file is invalid when we actually have a
 762                  * hit in kernel space and then try to load it. So if we get
 763                  * here and there are _no_ symbols in the DSO backing the
 764                  * kernel map, bail out.
 765                  *
 766                  * We may never get here, for instance, if we use -K/
 767                  * --hide-kernel-symbols, even if the user specifies an
 768                  * invalid --vmlinux ;-)
 769                  */
 770                 if (!top->kptr_restrict_warned && !top->vmlinux_warned &&
 771                     al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
 772                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
 773                         if (symbol_conf.vmlinux_name) {
 774                                 ui__warning("The %s file can't be used.\n%s",
 775                                             symbol_conf.vmlinux_name, msg);
 776                         } else {
 777                                 ui__warning("A vmlinux file was not found.\n%s",
 778                                             msg);
 779                         }
 780
 781                         if (use_browser <= 0)
 782                                 sleep(5);
 783                         top->vmlinux_warned = true;
 784                 }
 785         }
 786
 787         if (al.sym == NULL || !al.sym->ignore) {
 788                 struct hist_entry *he;
 789
 790                 if ((sort__has_parent || symbol_conf.use_callchain) &&
 791                     sample->callchain) {
 792                         err = machine__resolve_callchain(machine, evsel,
 793                                                          al.thread, sample,
 794                                                          &parent);
 795
 796                         if (err)
 797                                 return;
 798                 }
 799
 800                 he = perf_evsel__add_hist_entry(evsel, &al, sample);
 801                 if (he == NULL) {
 802                         pr_err("Problem incrementing symbol period, skipping event\n");
 803                         return;
 804                 }
 805
 806                 if (symbol_conf.use_callchain) {
 807                         err = callchain_append(he->callchain, &callchain_cursor,
 808                                                sample->period);
 809                         if (err)
 810                                 return;
 811                 }
 812
 813                 if (top->sort_has_symbols)
 814                         perf_top__record_precise_ip(top, he, evsel->idx, ip);
 815         }
 816
 817         return;
 818 }
 819
 820 static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
 821 {
 822         struct perf_sample sample;
 823         struct perf_evsel *evsel;
 824         struct perf_session *session = top->session;
 825         union perf_event *event;
 826         struct machine *machine;
 827         u8 origin;
 828         int ret;
 829
 830         while ((event = perf_evlist__mmap_read(top->evlist, idx)) != NULL) {
 831                 ret = perf_evlist__parse_sample(top->evlist, event, &sample);
 832                 if (ret) {
 833                         pr_err("Can't parse sample, err = %d\n", ret);
 834                         continue;
 835                 }
 836
 837                 evsel = perf_evlist__id2evsel(session->evlist, sample.id);
 838                 assert(evsel != NULL);
 839
 840                 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 841
 842                 if (event->header.type == PERF_RECORD_SAMPLE)
 843                         ++top->samples;
 844
 845                 switch (origin) {
 846                 case PERF_RECORD_MISC_USER:
 847                         ++top->us_samples;
 848                         if (top->hide_user_symbols)
 849                                 continue;
 850                         machine = perf_session__find_host_machine(session);
 851                         break;
 852                 case PERF_RECORD_MISC_KERNEL:
 853                         ++top->kernel_samples;
 854                         if (top->hide_kernel_symbols)
 855                                 continue;
 856                         machine = perf_session__find_host_machine(session);
 857                         break;
 858                 case PERF_RECORD_MISC_GUEST_KERNEL:
 859                         ++top->guest_kernel_samples;
 860                         machine = perf_session__find_machine(session, event->ip.pid);
 861                         break;
 862                 case PERF_RECORD_MISC_GUEST_USER:
 863                         ++top->guest_us_samples;
 864                         /*
 865                          * TODO: we don't process guest user from host side
 866                          * except simple counting.
 867                          */
 868                         /* Fall thru */
 869                 default:
 870                         continue;
 871                 }
 872
 873
 874                 if (event->header.type == PERF_RECORD_SAMPLE) {
 875                         perf_event__process_sample(&top->tool, event, evsel,
 876                                                    &sample, machine);
 877                 } else if (event->header.type < PERF_RECORD_MAX) {
 878                         hists__inc_nr_events(&evsel->hists, event->header.type);
 879                         machine__process_event(machine, event);
 880                 } else
 881                         ++session->hists.stats.nr_unknown_events;
 882         }
 883 }
 884
 885 static void perf_top__mmap_read(struct perf_top *top)
 886 {
 887         int i;
 888
 889         for (i = 0; i < top->evlist->nr_mmaps; i++)
 890                 perf_top__mmap_read_idx(top, i);
 891 }
 892
 893 static void perf_top__start_counters(struct perf_top *top)
 894 {
 895         struct perf_evsel *counter;
 896         struct perf_evlist *evlist = top->evlist;
 897         struct perf_record_opts *opts = &top->record_opts;
 898
 899         perf_evlist__config(evlist, opts);
 900
 901         list_for_each_entry(counter, &evlist->entries, node) {
 902                 struct perf_event_attr *attr = &counter->attr;
 903
 904 fallback_missing_features:
 905                 if (top->exclude_guest_missing)
 906                         attr->exclude_guest = attr->exclude_host = 0;
 907 retry_sample_id:
 908                 attr->sample_id_all = top->sample_id_all_missing ? 0 : 1;
 909 try_again:
 910                 if (perf_evsel__open(counter, top->evlist->cpus,
 911                                      top->evlist->threads) < 0) {
 912                         int err = errno;
 913
 914                         if (err == EPERM || err == EACCES) {
 915                                 ui__error_paranoid();
 916                                 goto out_err;
 917                         } else if (err == EINVAL) {
 918                                 if (!top->exclude_guest_missing &&
 919                                     (attr->exclude_guest || attr->exclude_host)) {
 920                                         pr_debug("Old kernel, cannot exclude "
 921                                                  "guest or host samples.\n");
 922                                         top->exclude_guest_missing = true;
 923                                         goto fallback_missing_features;
 924                                 } else if (!top->sample_id_all_missing) {
 925                                         /*
 926                                          * Old kernel, no attr->sample_id_type_all field
 927                                          */
 928                                         top->sample_id_all_missing = true;
 929                                         goto retry_sample_id;
 930                                 }
 931                         }
 932                         /*
 933                          * If it's cycles then fall back to hrtimer
 934                          * based cpu-clock-tick sw counter, which
 935                          * is always available even if no PMU support:
 936                          */
 937                         if ((err == ENOENT || err == ENXIO) &&
 938                             (attr->type == PERF_TYPE_HARDWARE) &&
 939                             (attr->config == PERF_COUNT_HW_CPU_CYCLES)) {
 940
 941                                 if (verbose)
 942                                         ui__warning("Cycles event not supported,\n"
 943                                                     "trying to fall back to cpu-clock-ticks\n");
 944
 945                                 attr->type = PERF_TYPE_SOFTWARE;
 946                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
 947                                 if (counter->name) {
 948                                         free(counter->name);
 949                                         counter->name = NULL;
 950                                 }
 951                                 goto try_again;
 952                         }
 953
 954                         if (err == ENOENT) {
 955                                 ui__error("The %s event is not supported.\n",
 956                                           perf_evsel__name(counter));
 957                                 goto out_err;
 958                         } else if (err == EMFILE) {
 959                                 ui__error("Too many events are opened.\n"
 960                                             "Try again after reducing the number of events\n");
 961                                 goto out_err;
 962                         } else if ((err == EOPNOTSUPP) && (attr->precise_ip)) {
 963                                 ui__error("\'precise\' request may not be supported. "
 964                                           "Try removing 'p' modifier\n");
 965                                 goto out_err;
 966                         }
 967
 968                         ui__error("The sys_perf_event_open() syscall "
 969                                     "returned with %d (%s).  /bin/dmesg "
 970                                     "may provide additional information.\n"
 971                                     "No CONFIG_PERF_EVENTS=y kernel support "
 972                                     "configured?\n", err, strerror(err));
 973                         goto out_err;
 974                 }
 975         }
 976
 977         if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
 978                 ui__error("Failed to mmap with %d (%s)\n",
 979                             errno, strerror(errno));
 980                 goto out_err;
 981         }
 982
 983         return;
 984
 985 out_err:
 986         exit_browser(0);
 987         exit(0);
 988 }
 989
 990 static int perf_top__setup_sample_type(struct perf_top *top)
 991 {
 992         if (!top->sort_has_symbols) {
 993                 if (symbol_conf.use_callchain) {
 994                         ui__error("Selected -g but \"sym\" not present in --sort/-s.");
 995                         return -EINVAL;
 996                 }
 997         } else if (callchain_param.mode != CHAIN_NONE) {
 998                 if (callchain_register_param(&callchain_param) < 0) {
 999                         ui__error("Can't register callchain params.\n");
1000                         return -EINVAL;
1001                 }
1002         }
1003
1004         return 0;
1005 }
1006
1007 static int __cmd_top(struct perf_top *top)
1008 {
1009         struct perf_record_opts *opts = &top->record_opts;
1010         pthread_t thread;
1011         int ret;
1012         /*
1013          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
1014          * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
1015          */
1016         top->session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
1017         if (top->session == NULL)
1018                 return -ENOMEM;
1019
1020         ret = perf_top__setup_sample_type(top);
1021         if (ret)
1022                 goto out_delete;
1023
1024         if (perf_target__has_task(&opts->target))
1025                 perf_event__synthesize_thread_map(&top->tool, top->evlist->threads,
1026                                                   perf_event__process,
1027                                                   &top->session->host_machine);
1028         else
1029                 perf_event__synthesize_threads(&top->tool, perf_event__process,
1030                                                &top->session->host_machine);
1031         perf_top__start_counters(top);
1032         top->session->evlist = top->evlist;
1033         perf_session__set_id_hdr_size(top->session);
1034
1035         /*
1036          * When perf is starting the traced process, all the events (apart from
1037          * group members) have enable_on_exec=1 set, so don't spoil it by
1038          * prematurely enabling them.
1039          *
1040          * XXX 'top' still doesn't start workloads like record, trace, but should,
1041          * so leave the check here.
1042          */
1043         if (!perf_target__none(&opts->target))
1044                 perf_evlist__enable(top->evlist);
1045
1046         /* Wait for a minimal set of events before starting the snapshot */
1047         poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1048
1049         perf_top__mmap_read(top);
1050
1051         if (pthread_create(&thread, NULL, (use_browser > 0 ? display_thread_tui :
1052                                                             display_thread), top)) {
1053                 ui__error("Could not create display thread.\n");
1054                 exit(-1);
1055         }
1056
1057         if (top->realtime_prio) {
1058                 struct sched_param param;
1059
1060                 param.sched_priority = top->realtime_prio;
1061                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1062                         ui__error("Could not set realtime priority.\n");
1063                         exit(-1);
1064                 }
1065         }
1066
1067         while (1) {
1068                 u64 hits = top->samples;
1069
1070                 perf_top__mmap_read(top);
1071
1072                 if (hits == top->samples)
1073                         ret = poll(top->evlist->pollfd, top->evlist->nr_fds, 100);
1074         }
1075
1076 out_delete:
1077         perf_session__delete(top->session);
1078         top->session = NULL;
1079
1080         return 0;
1081 }
1082
1083 static int
1084 parse_callchain_opt(const struct option *opt, const char *arg, int unset)
1085 {
1086         /*
1087          * --no-call-graph
1088          */
1089         if (unset)
1090                 return 0;
1091
1092         symbol_conf.use_callchain = true;
1093
1094         return record_parse_callchain_opt(opt, arg, unset);
1095 }
1096
1097 int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
1098 {
1099         int status;
1100         char errbuf[BUFSIZ];
1101         struct perf_top top = {
1102                 .count_filter        = 5,
1103                 .delay_secs          = 2,
1104                 .record_opts = {
1105                         .mmap_pages     = UINT_MAX,
1106                         .user_freq      = UINT_MAX,
1107                         .user_interval  = ULLONG_MAX,
1108                         .freq           = 4000, /* 4 KHz */
1109                         .target              = {
1110                                 .uses_mmap   = true,
1111                         },
1112                 },
1113                 .sym_pcnt_filter     = 5,
1114         };
1115         struct perf_record_opts *opts = &top.record_opts;
1116         struct perf_target *target = &opts->target;
1117         const struct option options[] = {
1118         OPT_CALLBACK('e', "event", &top.evlist, "event",
1119                      "event selector. use 'perf list' to list available events",
1120                      parse_events_option),
1121         OPT_U64('c', "count", &opts->user_interval, "event period to sample"),
1122         OPT_STRING('p', "pid", &target->pid, "pid",
1123                     "profile events on existing process id"),
1124         OPT_STRING('t', "tid", &target->tid, "tid",
1125                     "profile events on existing thread id"),
1126         OPT_BOOLEAN('a', "all-cpus", &target->system_wide,
1127                             "system-wide collection from all CPUs"),
1128         OPT_STRING('C', "cpu", &target->cpu_list, "cpu",
1129                     "list of cpus to monitor"),
1130         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1131                    "file", "vmlinux pathname"),
1132         OPT_BOOLEAN('K', "hide_kernel_symbols", &top.hide_kernel_symbols,
1133                     "hide kernel symbols"),
1134         OPT_UINTEGER('m', "mmap-pages", &opts->mmap_pages,
1135                      "number of mmap data pages"),
1136         OPT_INTEGER('r', "realtime", &top.realtime_prio,
1137                     "collect data with this RT SCHED_FIFO priority"),
1138         OPT_INTEGER('d', "delay", &top.delay_secs,
1139                     "number of seconds to delay between refreshes"),
1140         OPT_BOOLEAN('D', "dump-symtab", &top.dump_symtab,
1141                             "dump the symbol table used for profiling"),
1142         OPT_INTEGER('f', "count-filter", &top.count_filter,
1143                     "only display functions with more events than this"),
1144         OPT_BOOLEAN('g', "group", &opts->group,
1145                             "put the counters into a counter group"),
1146         OPT_BOOLEAN('i', "no-inherit", &opts->no_inherit,
1147                     "child tasks do not inherit counters"),
1148         OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
1149                     "symbol to annotate"),
1150         OPT_BOOLEAN('z', "zero", &top.zero, "zero history across updates"),
1151         OPT_UINTEGER('F', "freq", &opts->user_freq, "profile at this frequency"),
1152         OPT_INTEGER('E', "entries", &top.print_entries,
1153                     "display this many functions"),
1154         OPT_BOOLEAN('U', "hide_user_symbols", &top.hide_user_symbols,
1155                     "hide user symbols"),
1156         OPT_BOOLEAN(0, "tui", &top.use_tui, "Use the TUI interface"),
1157         OPT_BOOLEAN(0, "stdio", &top.use_stdio, "Use the stdio interface"),
1158         OPT_INCR('v', "verbose", &verbose,
1159                     "be more verbose (show counter open errors, etc)"),
1160         OPT_STRING('s', "sort", &sort_order, "key[,key2...]",
1161                    "sort by key(s): pid, comm, dso, symbol, parent"),
1162         OPT_BOOLEAN('n', "show-nr-samples", &symbol_conf.show_nr_samples,
1163                     "Show a column with the number of samples"),
1164         OPT_CALLBACK_DEFAULT('G', "call-graph", &top.record_opts,
1165                              "mode[,dump_size]", record_callchain_help,
1166                              &parse_callchain_opt, "fp"),
1167         OPT_BOOLEAN(0, "show-total-period", &symbol_conf.show_total_period,
1168                     "Show a column with the sum of periods"),
1169         OPT_STRING(0, "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
1170                    "only consider symbols in these dsos"),
1171         OPT_STRING(0, "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
1172                    "only consider symbols in these comms"),
1173         OPT_STRING(0, "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
1174                    "only consider these symbols"),
1175         OPT_BOOLEAN(0, "source", &symbol_conf.annotate_src,
1176                     "Interleave source code with assembly code (default)"),
1177         OPT_BOOLEAN(0, "asm-raw", &symbol_conf.annotate_asm_raw,
1178                     "Display raw encoding of assembly instructions (default)"),
1179         OPT_STRING('M', "disassembler-style", &disassembler_style, "disassembler style",
1180                    "Specify disassembler style (e.g. -M intel for intel syntax)"),
1181         OPT_STRING('u', "uid", &target->uid_str, "user", "user to profile"),
1182         OPT_END()
1183         };
1184         const char * const top_usage[] = {
1185                 "perf top [<options>]",
1186                 NULL
1187         };
1188
1189         top.evlist = perf_evlist__new(NULL, NULL);
1190         if (top.evlist == NULL)
1191                 return -ENOMEM;
1192
1193         symbol_conf.exclude_other = false;
1194
1195         argc = parse_options(argc, argv, options, top_usage, 0);
1196         if (argc)
1197                 usage_with_options(top_usage, options);
1198
1199         if (sort_order == default_sort_order)
1200                 sort_order = "dso,symbol";
1201
1202         setup_sorting(top_usage, options);
1203
1204         if (top.use_stdio)
1205                 use_browser = 0;
1206         else if (top.use_tui)
1207                 use_browser = 1;
1208
1209         setup_browser(false);
1210
1211         status = perf_target__validate(target);
1212         if (status) {
1213                 perf_target__strerror(target, status, errbuf, BUFSIZ);
1214                 ui__warning("%s", errbuf);
1215         }
1216
1217         status = perf_target__parse_uid(target);
1218         if (status) {
1219                 int saved_errno = errno;
1220
1221                 perf_target__strerror(target, status, errbuf, BUFSIZ);
1222                 ui__error("%s", errbuf);
1223
1224                 status = -saved_errno;
1225                 goto out_delete_evlist;
1226         }
1227
1228         if (perf_target__none(target))
1229                 target->system_wide = true;
1230
1231         if (perf_evlist__create_maps(top.evlist, target) < 0)
1232                 usage_with_options(top_usage, options);
1233
1234         if (!top.evlist->nr_entries &&
1235             perf_evlist__add_default(top.evlist) < 0) {
1236                 ui__error("Not enough memory for event selector list\n");
1237                 return -ENOMEM;
1238         }
1239
1240         symbol_conf.nr_events = top.evlist->nr_entries;
1241
1242         if (top.delay_secs < 1)
1243                 top.delay_secs = 1;
1244
1245         if (opts->user_interval != ULLONG_MAX)
1246                 opts->default_interval = opts->user_interval;
1247         if (opts->user_freq != UINT_MAX)
1248                 opts->freq = opts->user_freq;
1249
1250         /*
1251          * User specified count overrides default frequency.
1252          */
1253         if (opts->default_interval)
1254                 opts->freq = 0;
1255         else if (opts->freq) {
1256                 opts->default_interval = opts->freq;
1257         } else {
1258                 ui__error("frequency and count are zero, aborting\n");
1259                 status = -EINVAL;
1260                 goto out_delete_evlist;
1261         }
1262
1263         top.sym_evsel = perf_evlist__first(top.evlist);
1264
1265         symbol_conf.priv_size = sizeof(struct annotation);
1266
1267         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1268         if (symbol__init() < 0)
1269                 return -1;
1270
1271         sort_entry__setup_elide(&sort_dso, symbol_conf.dso_list, "dso", stdout);
1272         sort_entry__setup_elide(&sort_comm, symbol_conf.comm_list, "comm", stdout);
1273         sort_entry__setup_elide(&sort_sym, symbol_conf.sym_list, "symbol", stdout);
1274
1275         /*
1276          * Avoid annotation data structures overhead when symbols aren't on the
1277          * sort list.
1278          */
1279         top.sort_has_symbols = sort_sym.list.next != NULL;
1280
1281         get_term_dimensions(&top.winsize);
1282         if (top.print_entries == 0) {
1283                 struct sigaction act = {
1284                         .sa_sigaction = perf_top__sig_winch,
1285                         .sa_flags     = SA_SIGINFO,
1286                 };
1287                 perf_top__update_print_entries(&top);
1288                 sigaction(SIGWINCH, &act, NULL);
1289         }
1290
1291         status = __cmd_top(&top);
1292
1293 out_delete_evlist:
1294         perf_evlist__delete(top.evlist);
1295
1296         return status;
1297 }