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  *
   9  * Improvements and fixes by:
  10  *
  11  *   Arjan van de Ven <arjan@linux.intel.com>
  12  *   Yanmin Zhang <yanmin.zhang@intel.com>
  13  *   Wu Fengguang <fengguang.wu@intel.com>
  14  *   Mike Galbraith <efault@gmx.de>
  15  *   Paul Mackerras <paulus@samba.org>
  16  *
  17  * Released under the GPL v2. (and only v2, not any later version)
  18  */
  19 #include "builtin.h"
  20
  21 #include "perf.h"
  22
  23 #include "util/color.h"
  24 #include "util/evsel.h"
  25 #include "util/session.h"
  26 #include "util/symbol.h"
  27 #include "util/thread.h"
  28 #include "util/util.h"
  29 #include <linux/rbtree.h>
  30 #include "util/parse-options.h"
  31 #include "util/parse-events.h"
  32 #include "util/cpumap.h"
  33 #include "util/xyarray.h"
  34
  35 #include "util/debug.h"
  36
  37 #include <assert.h>
  38 #include <fcntl.h>
  39
  40 #include <stdio.h>
  41 #include <termios.h>
  42 #include <unistd.h>
  43 #include <inttypes.h>
  44
  45 #include <errno.h>
  46 #include <time.h>
  47 #include <sched.h>
  48 #include <pthread.h>
  49
  50 #include <sys/syscall.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/poll.h>
  53 #include <sys/prctl.h>
  54 #include <sys/wait.h>
  55 #include <sys/uio.h>
  56 #include <sys/mman.h>
  57
  58 #include <linux/unistd.h>
  59 #include <linux/types.h>
  60
  61 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  62
  63 static bool                     system_wide                     =  false;
  64
  65 static int                      default_interval                =      0;
  66
  67 static int                      count_filter                    =      5;
  68 static int                      print_entries;
  69
  70 static int                      target_pid                      =     -1;
  71 static int                      target_tid                      =     -1;
  72 static struct thread_map        *threads;
  73 static bool                     inherit                         =  false;
  74 static struct cpu_map           *cpus;
  75 static int                      realtime_prio                   =      0;
  76 static bool                     group                           =  false;
  77 static unsigned int             page_size;
  78 static unsigned int             mmap_pages                      =     16;
  79 static int                      freq                            =   1000; /* 1 KHz */
  80
  81 static int                      delay_secs                      =      2;
  82 static bool                     zero                            =  false;
  83 static bool                     dump_symtab                     =  false;
  84
  85 static bool                     hide_kernel_symbols             =  false;
  86 static bool                     hide_user_symbols               =  false;
  87 static struct winsize           winsize;
  88
  89 /*
  90  * Source
  91  */
  92
  93 struct source_line {
  94         u64                     eip;
  95         unsigned long           count[MAX_COUNTERS];
  96         char                    *line;
  97         struct source_line      *next;
  98 };
  99
 100 static const char               *sym_filter                     =   NULL;
 101 struct sym_entry                *sym_filter_entry               =   NULL;
 102 struct sym_entry                *sym_filter_entry_sched         =   NULL;
 103 static int                      sym_pcnt_filter                 =      5;
 104 static int                      sym_counter                     =      0;
 105 static struct perf_evsel        *sym_evsel                      =   NULL;
 106 static int                      display_weighted                =     -1;
 107 static const char               *cpu_list;
 108
 109 /*
 110  * Symbols
 111  */
 112
 113 struct sym_entry_source {
 114         struct source_line      *source;
 115         struct source_line      *lines;
 116         struct source_line      **lines_tail;
 117         pthread_mutex_t         lock;
 118 };
 119
 120 struct sym_entry {
 121         struct rb_node          rb_node;
 122         struct list_head        node;
 123         unsigned long           snap_count;
 124         double                  weight;
 125         int                     skip;
 126         u16                     name_len;
 127         u8                      origin;
 128         struct map              *map;
 129         struct sym_entry_source *src;
 130         unsigned long           count[0];
 131 };
 132
 133 /*
 134  * Source functions
 135  */
 136
 137 static inline struct symbol *sym_entry__symbol(struct sym_entry *self)
 138 {
 139        return ((void *)self) + symbol_conf.priv_size;
 140 }
 141
 142 void get_term_dimensions(struct winsize *ws)
 143 {
 144         char *s = getenv("LINES");
 145
 146         if (s != NULL) {
 147                 ws->ws_row = atoi(s);
 148                 s = getenv("COLUMNS");
 149                 if (s != NULL) {
 150                         ws->ws_col = atoi(s);
 151                         if (ws->ws_row && ws->ws_col)
 152                                 return;
 153                 }
 154         }
 155 #ifdef TIOCGWINSZ
 156         if (ioctl(1, TIOCGWINSZ, ws) == 0 &&
 157             ws->ws_row && ws->ws_col)
 158                 return;
 159 #endif
 160         ws->ws_row = 25;
 161         ws->ws_col = 80;
 162 }
 163
 164 static void update_print_entries(struct winsize *ws)
 165 {
 166         print_entries = ws->ws_row;
 167
 168         if (print_entries > 9)
 169                 print_entries -= 9;
 170 }
 171
 172 static void sig_winch_handler(int sig __used)
 173 {
 174         get_term_dimensions(&winsize);
 175         update_print_entries(&winsize);
 176 }
 177
 178 static int parse_source(struct sym_entry *syme)
 179 {
 180         struct symbol *sym;
 181         struct sym_entry_source *source;
 182         struct map *map;
 183         FILE *file;
 184         char command[PATH_MAX*2];
 185         const char *path;
 186         u64 len;
 187
 188         if (!syme)
 189                 return -1;
 190
 191         sym = sym_entry__symbol(syme);
 192         map = syme->map;
 193
 194         /*
 195          * We can't annotate with just /proc/kallsyms
 196          */
 197         if (map->dso->origin == DSO__ORIG_KERNEL)
 198                 return -1;
 199
 200         if (syme->src == NULL) {
 201                 syme->src = zalloc(sizeof(*source));
 202                 if (syme->src == NULL)
 203                         return -1;
 204                 pthread_mutex_init(&syme->src->lock, NULL);
 205         }
 206
 207         source = syme->src;
 208
 209         if (source->lines) {
 210                 pthread_mutex_lock(&source->lock);
 211                 goto out_assign;
 212         }
 213         path = map->dso->long_name;
 214
 215         len = sym->end - sym->start;
 216
 217         sprintf(command,
 218                 "objdump --start-address=%#0*" PRIx64 " --stop-address=%#0*" PRIx64 " -dS %s",
 219                 BITS_PER_LONG / 4, map__rip_2objdump(map, sym->start),
 220                 BITS_PER_LONG / 4, map__rip_2objdump(map, sym->end), path);
 221
 222         file = popen(command, "r");
 223         if (!file)
 224                 return -1;
 225
 226         pthread_mutex_lock(&source->lock);
 227         source->lines_tail = &source->lines;
 228         while (!feof(file)) {
 229                 struct source_line *src;
 230                 size_t dummy = 0;
 231                 char *c, *sep;
 232
 233                 src = malloc(sizeof(struct source_line));
 234                 assert(src != NULL);
 235                 memset(src, 0, sizeof(struct source_line));
 236
 237                 if (getline(&src->line, &dummy, file) < 0)
 238                         break;
 239                 if (!src->line)
 240                         break;
 241
 242                 c = strchr(src->line, '\n');
 243                 if (c)
 244                         *c = 0;
 245
 246                 src->next = NULL;
 247                 *source->lines_tail = src;
 248                 source->lines_tail = &src->next;
 249
 250                 src->eip = strtoull(src->line, &sep, 16);
 251                 if (*sep == ':')
 252                         src->eip = map__objdump_2ip(map, src->eip);
 253                 else /* this line has no ip info (e.g. source line) */
 254                         src->eip = 0;
 255         }
 256         pclose(file);
 257 out_assign:
 258         sym_filter_entry = syme;
 259         pthread_mutex_unlock(&source->lock);
 260         return 0;
 261 }
 262
 263 static void __zero_source_counters(struct sym_entry *syme)
 264 {
 265         int i;
 266         struct source_line *line;
 267
 268         line = syme->src->lines;
 269         while (line) {
 270                 for (i = 0; i < nr_counters; i++)
 271                         line->count[i] = 0;
 272                 line = line->next;
 273         }
 274 }
 275
 276 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
 277 {
 278         struct source_line *line;
 279
 280         if (syme != sym_filter_entry)
 281                 return;
 282
 283         if (pthread_mutex_trylock(&syme->src->lock))
 284                 return;
 285
 286         if (syme->src == NULL || syme->src->source == NULL)
 287                 goto out_unlock;
 288
 289         for (line = syme->src->lines; line; line = line->next) {
 290                 /* skip lines without IP info */
 291                 if (line->eip == 0)
 292                         continue;
 293                 if (line->eip == ip) {
 294                         line->count[counter]++;
 295                         break;
 296                 }
 297                 if (line->eip > ip)
 298                         break;
 299         }
 300 out_unlock:
 301         pthread_mutex_unlock(&syme->src->lock);
 302 }
 303
 304 #define PATTERN_LEN             (BITS_PER_LONG / 4 + 2)
 305
 306 static void lookup_sym_source(struct sym_entry *syme)
 307 {
 308         struct symbol *symbol = sym_entry__symbol(syme);
 309         struct source_line *line;
 310         char pattern[PATTERN_LEN + 1];
 311
 312         sprintf(pattern, "%0*" PRIx64 " <", BITS_PER_LONG / 4,
 313                 map__rip_2objdump(syme->map, symbol->start));
 314
 315         pthread_mutex_lock(&syme->src->lock);
 316         for (line = syme->src->lines; line; line = line->next) {
 317                 if (memcmp(line->line, pattern, PATTERN_LEN) == 0) {
 318                         syme->src->source = line;
 319                         break;
 320                 }
 321         }
 322         pthread_mutex_unlock(&syme->src->lock);
 323 }
 324
 325 static void show_lines(struct source_line *queue, int count, int total)
 326 {
 327         int i;
 328         struct source_line *line;
 329
 330         line = queue;
 331         for (i = 0; i < count; i++) {
 332                 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
 333
 334                 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
 335                 line = line->next;
 336         }
 337 }
 338
 339 #define TRACE_COUNT     3
 340
 341 static void show_details(struct sym_entry *syme)
 342 {
 343         struct symbol *symbol;
 344         struct source_line *line;
 345         struct source_line *line_queue = NULL;
 346         int displayed = 0;
 347         int line_queue_count = 0, total = 0, more = 0;
 348
 349         if (!syme)
 350                 return;
 351
 352         if (!syme->src->source)
 353                 lookup_sym_source(syme);
 354
 355         if (!syme->src->source)
 356                 return;
 357
 358         symbol = sym_entry__symbol(syme);
 359         printf("Showing %s for %s\n", event_name(sym_evsel), symbol->name);
 360         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
 361
 362         pthread_mutex_lock(&syme->src->lock);
 363         line = syme->src->source;
 364         while (line) {
 365                 total += line->count[sym_counter];
 366                 line = line->next;
 367         }
 368
 369         line = syme->src->source;
 370         while (line) {
 371                 float pcnt = 0.0;
 372
 373                 if (!line_queue_count)
 374                         line_queue = line;
 375                 line_queue_count++;
 376
 377                 if (line->count[sym_counter])
 378                         pcnt = 100.0 * line->count[sym_counter] / (float)total;
 379                 if (pcnt >= (float)sym_pcnt_filter) {
 380                         if (displayed <= print_entries)
 381                                 show_lines(line_queue, line_queue_count, total);
 382                         else more++;
 383                         displayed += line_queue_count;
 384                         line_queue_count = 0;
 385                         line_queue = NULL;
 386                 } else if (line_queue_count > TRACE_COUNT) {
 387                         line_queue = line_queue->next;
 388                         line_queue_count--;
 389                 }
 390
 391                 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
 392                 line = line->next;
 393         }
 394         pthread_mutex_unlock(&syme->src->lock);
 395         if (more)
 396                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 397 }
 398
 399 /*
 400  * Symbols will be added here in event__process_sample and will get out
 401  * after decayed.
 402  */
 403 static LIST_HEAD(active_symbols);
 404 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
 405
 406 /*
 407  * Ordering weight: count-1 * count-2 * ... / count-n
 408  */
 409 static double sym_weight(const struct sym_entry *sym)
 410 {
 411         double weight = sym->snap_count;
 412         int counter;
 413
 414         if (!display_weighted)
 415                 return weight;
 416
 417         for (counter = 1; counter < nr_counters-1; counter++)
 418                 weight *= sym->count[counter];
 419
 420         weight /= (sym->count[counter] + 1);
 421
 422         return weight;
 423 }
 424
 425 static long                     samples;
 426 static long                     kernel_samples, us_samples;
 427 static long                     exact_samples;
 428 static long                     guest_us_samples, guest_kernel_samples;
 429 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
 430
 431 static void __list_insert_active_sym(struct sym_entry *syme)
 432 {
 433         list_add(&syme->node, &active_symbols);
 434 }
 435
 436 static void list_remove_active_sym(struct sym_entry *syme)
 437 {
 438         pthread_mutex_lock(&active_symbols_lock);
 439         list_del_init(&syme->node);
 440         pthread_mutex_unlock(&active_symbols_lock);
 441 }
 442
 443 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
 444 {
 445         struct rb_node **p = &tree->rb_node;
 446         struct rb_node *parent = NULL;
 447         struct sym_entry *iter;
 448
 449         while (*p != NULL) {
 450                 parent = *p;
 451                 iter = rb_entry(parent, struct sym_entry, rb_node);
 452
 453                 if (se->weight > iter->weight)
 454                         p = &(*p)->rb_left;
 455                 else
 456                         p = &(*p)->rb_right;
 457         }
 458
 459         rb_link_node(&se->rb_node, parent, p);
 460         rb_insert_color(&se->rb_node, tree);
 461 }
 462
 463 static void print_sym_table(void)
 464 {
 465         int printed = 0, j;
 466         struct perf_evsel *counter;
 467         int snap = !display_weighted ? sym_counter : 0;
 468         float samples_per_sec = samples/delay_secs;
 469         float ksamples_per_sec = kernel_samples/delay_secs;
 470         float us_samples_per_sec = (us_samples)/delay_secs;
 471         float guest_kernel_samples_per_sec = (guest_kernel_samples)/delay_secs;
 472         float guest_us_samples_per_sec = (guest_us_samples)/delay_secs;
 473         float esamples_percent = (100.0*exact_samples)/samples;
 474         float sum_ksamples = 0.0;
 475         struct sym_entry *syme, *n;
 476         struct rb_root tmp = RB_ROOT;
 477         struct rb_node *nd;
 478         int sym_width = 0, dso_width = 0, dso_short_width = 0;
 479         const int win_width = winsize.ws_col - 1;
 480
 481         samples = us_samples = kernel_samples = exact_samples = 0;
 482         guest_kernel_samples = guest_us_samples = 0;
 483
 484         /* Sort the active symbols */
 485         pthread_mutex_lock(&active_symbols_lock);
 486         syme = list_entry(active_symbols.next, struct sym_entry, node);
 487         pthread_mutex_unlock(&active_symbols_lock);
 488
 489         list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
 490                 syme->snap_count = syme->count[snap];
 491                 if (syme->snap_count != 0) {
 492
 493                         if ((hide_user_symbols &&
 494                              syme->origin == PERF_RECORD_MISC_USER) ||
 495                             (hide_kernel_symbols &&
 496                              syme->origin == PERF_RECORD_MISC_KERNEL)) {
 497                                 list_remove_active_sym(syme);
 498                                 continue;
 499                         }
 500                         syme->weight = sym_weight(syme);
 501                         rb_insert_active_sym(&tmp, syme);
 502                         sum_ksamples += syme->snap_count;
 503
 504                         for (j = 0; j < nr_counters; j++)
 505                                 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
 506                 } else
 507                         list_remove_active_sym(syme);
 508         }
 509
 510         puts(CONSOLE_CLEAR);
 511
 512         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 513         if (!perf_guest) {
 514                 printf("   PerfTop:%8.0f irqs/sec  kernel:%4.1f%%"
 515                         "  exact: %4.1f%% [",
 516                         samples_per_sec,
 517                         100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) /
 518                                          samples_per_sec)),
 519                         esamples_percent);
 520         } else {
 521                 printf("   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% us:%4.1f%%"
 522                         " guest kernel:%4.1f%% guest us:%4.1f%%"
 523                         " exact: %4.1f%% [",
 524                         samples_per_sec,
 525                         100.0 - (100.0 * ((samples_per_sec-ksamples_per_sec) /
 526                                           samples_per_sec)),
 527                         100.0 - (100.0 * ((samples_per_sec-us_samples_per_sec) /
 528                                           samples_per_sec)),
 529                         100.0 - (100.0 * ((samples_per_sec -
 530                                                 guest_kernel_samples_per_sec) /
 531                                           samples_per_sec)),
 532                         100.0 - (100.0 * ((samples_per_sec -
 533                                            guest_us_samples_per_sec) /
 534                                           samples_per_sec)),
 535                         esamples_percent);
 536         }
 537
 538         if (nr_counters == 1 || !display_weighted) {
 539                 struct perf_evsel *first;
 540                 first = list_entry(evsel_list.next, struct perf_evsel, node);
 541                 printf("%" PRIu64, (uint64_t)first->attr.sample_period);
 542                 if (freq)
 543                         printf("Hz ");
 544                 else
 545                         printf(" ");
 546         }
 547
 548         if (!display_weighted)
 549                 printf("%s", event_name(sym_evsel));
 550         else list_for_each_entry(counter, &evsel_list, node) {
 551                 if (counter->idx)
 552                         printf("/");
 553
 554                 printf("%s", event_name(counter));
 555         }
 556
 557         printf( "], ");
 558
 559         if (target_pid != -1)
 560                 printf(" (target_pid: %d", target_pid);
 561         else if (target_tid != -1)
 562                 printf(" (target_tid: %d", target_tid);
 563         else
 564                 printf(" (all");
 565
 566         if (cpu_list)
 567                 printf(", CPU%s: %s)\n", cpus->nr > 1 ? "s" : "", cpu_list);
 568         else {
 569                 if (target_tid != -1)
 570                         printf(")\n");
 571                 else
 572                         printf(", %d CPU%s)\n", cpus->nr, cpus->nr > 1 ? "s" : "");
 573         }
 574
 575         printf("%-*.*s\n", win_width, win_width, graph_dotted_line);
 576
 577         if (sym_filter_entry) {
 578                 show_details(sym_filter_entry);
 579                 return;
 580         }
 581
 582         /*
 583          * Find the longest symbol name that will be displayed
 584          */
 585         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
 586                 syme = rb_entry(nd, struct sym_entry, rb_node);
 587                 if (++printed > print_entries ||
 588                     (int)syme->snap_count < count_filter)
 589                         continue;
 590
 591                 if (syme->map->dso->long_name_len > dso_width)
 592                         dso_width = syme->map->dso->long_name_len;
 593
 594                 if (syme->map->dso->short_name_len > dso_short_width)
 595                         dso_short_width = syme->map->dso->short_name_len;
 596
 597                 if (syme->name_len > sym_width)
 598                         sym_width = syme->name_len;
 599         }
 600
 601         printed = 0;
 602
 603         if (sym_width + dso_width > winsize.ws_col - 29) {
 604                 dso_width = dso_short_width;
 605                 if (sym_width + dso_width > winsize.ws_col - 29)
 606                         sym_width = winsize.ws_col - dso_width - 29;
 607         }
 608         putchar('\n');
 609         if (nr_counters == 1)
 610                 printf("             samples  pcnt");
 611         else
 612                 printf("   weight    samples  pcnt");
 613
 614         if (verbose)
 615                 printf("         RIP       ");
 616         printf(" %-*.*s DSO\n", sym_width, sym_width, "function");
 617         printf("   %s    _______ _____",
 618                nr_counters == 1 ? "      " : "______");
 619         if (verbose)
 620                 printf(" ________________");
 621         printf(" %-*.*s", sym_width, sym_width, graph_line);
 622         printf(" %-*.*s", dso_width, dso_width, graph_line);
 623         puts("\n");
 624
 625         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
 626                 struct symbol *sym;
 627                 double pcnt;
 628
 629                 syme = rb_entry(nd, struct sym_entry, rb_node);
 630                 sym = sym_entry__symbol(syme);
 631                 if (++printed > print_entries || (int)syme->snap_count < count_filter)
 632                         continue;
 633
 634                 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
 635                                          sum_ksamples));
 636
 637                 if (nr_counters == 1 || !display_weighted)
 638                         printf("%20.2f ", syme->weight);
 639                 else
 640                         printf("%9.1f %10ld ", syme->weight, syme->snap_count);
 641
 642                 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
 643                 if (verbose)
 644                         printf(" %016" PRIx64, sym->start);
 645                 printf(" %-*.*s", sym_width, sym_width, sym->name);
 646                 printf(" %-*.*s\n", dso_width, dso_width,
 647                        dso_width >= syme->map->dso->long_name_len ?
 648                                         syme->map->dso->long_name :
 649                                         syme->map->dso->short_name);
 650         }
 651 }
 652
 653 static void prompt_integer(int *target, const char *msg)
 654 {
 655         char *buf = malloc(0), *p;
 656         size_t dummy = 0;
 657         int tmp;
 658
 659         fprintf(stdout, "\n%s: ", msg);
 660         if (getline(&buf, &dummy, stdin) < 0)
 661                 return;
 662
 663         p = strchr(buf, '\n');
 664         if (p)
 665                 *p = 0;
 666
 667         p = buf;
 668         while(*p) {
 669                 if (!isdigit(*p))
 670                         goto out_free;
 671                 p++;
 672         }
 673         tmp = strtoul(buf, NULL, 10);
 674         *target = tmp;
 675 out_free:
 676         free(buf);
 677 }
 678
 679 static void prompt_percent(int *target, const char *msg)
 680 {
 681         int tmp = 0;
 682
 683         prompt_integer(&tmp, msg);
 684         if (tmp >= 0 && tmp <= 100)
 685                 *target = tmp;
 686 }
 687
 688 static void prompt_symbol(struct sym_entry **target, const char *msg)
 689 {
 690         char *buf = malloc(0), *p;
 691         struct sym_entry *syme = *target, *n, *found = NULL;
 692         size_t dummy = 0;
 693
 694         /* zero counters of active symbol */
 695         if (syme) {
 696                 pthread_mutex_lock(&syme->src->lock);
 697                 __zero_source_counters(syme);
 698                 *target = NULL;
 699                 pthread_mutex_unlock(&syme->src->lock);
 700         }
 701
 702         fprintf(stdout, "\n%s: ", msg);
 703         if (getline(&buf, &dummy, stdin) < 0)
 704                 goto out_free;
 705
 706         p = strchr(buf, '\n');
 707         if (p)
 708                 *p = 0;
 709
 710         pthread_mutex_lock(&active_symbols_lock);
 711         syme = list_entry(active_symbols.next, struct sym_entry, node);
 712         pthread_mutex_unlock(&active_symbols_lock);
 713
 714         list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
 715                 struct symbol *sym = sym_entry__symbol(syme);
 716
 717                 if (!strcmp(buf, sym->name)) {
 718                         found = syme;
 719                         break;
 720                 }
 721         }
 722
 723         if (!found) {
 724                 fprintf(stderr, "Sorry, %s is not active.\n", buf);
 725                 sleep(1);
 726                 return;
 727         } else
 728                 parse_source(found);
 729
 730 out_free:
 731         free(buf);
 732 }
 733
 734 static void print_mapped_keys(void)
 735 {
 736         char *name = NULL;
 737
 738         if (sym_filter_entry) {
 739                 struct symbol *sym = sym_entry__symbol(sym_filter_entry);
 740                 name = sym->name;
 741         }
 742
 743         fprintf(stdout, "\nMapped keys:\n");
 744         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", delay_secs);
 745         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", print_entries);
 746
 747         if (nr_counters > 1)
 748                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(sym_evsel));
 749
 750         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", count_filter);
 751
 752         fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
 753         fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 754         fprintf(stdout, "\t[S]     stop annotation.\n");
 755
 756         if (nr_counters > 1)
 757                 fprintf(stdout, "\t[w]     toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
 758
 759         fprintf(stdout,
 760                 "\t[K]     hide kernel_symbols symbols.     \t(%s)\n",
 761                 hide_kernel_symbols ? "yes" : "no");
 762         fprintf(stdout,
 763                 "\t[U]     hide user symbols.               \t(%s)\n",
 764                 hide_user_symbols ? "yes" : "no");
 765         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", zero ? 1 : 0);
 766         fprintf(stdout, "\t[qQ]    quit.\n");
 767 }
 768
 769 static int key_mapped(int c)
 770 {
 771         switch (c) {
 772                 case 'd':
 773                 case 'e':
 774                 case 'f':
 775                 case 'z':
 776                 case 'q':
 777                 case 'Q':
 778                 case 'K':
 779                 case 'U':
 780                 case 'F':
 781                 case 's':
 782                 case 'S':
 783                         return 1;
 784                 case 'E':
 785                 case 'w':
 786                         return nr_counters > 1 ? 1 : 0;
 787                 default:
 788                         break;
 789         }
 790
 791         return 0;
 792 }
 793
 794 static void handle_keypress(struct perf_session *session, int c)
 795 {
 796         if (!key_mapped(c)) {
 797                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 798                 struct termios tc, save;
 799
 800                 print_mapped_keys();
 801                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 802                 fflush(stdout);
 803
 804                 tcgetattr(0, &save);
 805                 tc = save;
 806                 tc.c_lflag &= ~(ICANON | ECHO);
 807                 tc.c_cc[VMIN] = 0;
 808                 tc.c_cc[VTIME] = 0;
 809                 tcsetattr(0, TCSANOW, &tc);
 810
 811                 poll(&stdin_poll, 1, -1);
 812                 c = getc(stdin);
 813
 814                 tcsetattr(0, TCSAFLUSH, &save);
 815                 if (!key_mapped(c))
 816                         return;
 817         }
 818
 819         switch (c) {
 820                 case 'd':
 821                         prompt_integer(&delay_secs, "Enter display delay");
 822                         if (delay_secs < 1)
 823                                 delay_secs = 1;
 824                         break;
 825                 case 'e':
 826                         prompt_integer(&print_entries, "Enter display entries (lines)");
 827                         if (print_entries == 0) {
 828                                 sig_winch_handler(SIGWINCH);
 829                                 signal(SIGWINCH, sig_winch_handler);
 830                         } else
 831                                 signal(SIGWINCH, SIG_DFL);
 832                         break;
 833                 case 'E':
 834                         if (nr_counters > 1) {
 835                                 fprintf(stderr, "\nAvailable events:");
 836
 837                                 list_for_each_entry(sym_evsel, &evsel_list, node)
 838                                         fprintf(stderr, "\n\t%d %s", sym_evsel->idx, event_name(sym_evsel));
 839
 840                                 prompt_integer(&sym_counter, "Enter details event counter");
 841
 842                                 if (sym_counter >= nr_counters) {
 843                                         sym_evsel = list_entry(evsel_list.next, struct perf_evsel, node);
 844                                         sym_counter = 0;
 845                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(sym_evsel));
 846                                         sleep(1);
 847                                         break;
 848                                 }
 849                                 list_for_each_entry(sym_evsel, &evsel_list, node)
 850                                         if (sym_evsel->idx == sym_counter)
 851                                                 break;
 852                         } else sym_counter = 0;
 853                         break;
 854                 case 'f':
 855                         prompt_integer(&count_filter, "Enter display event count filter");
 856                         break;
 857                 case 'F':
 858                         prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
 859                         break;
 860                 case 'K':
 861                         hide_kernel_symbols = !hide_kernel_symbols;
 862                         break;
 863                 case 'q':
 864                 case 'Q':
 865                         printf("exiting.\n");
 866                         if (dump_symtab)
 867                                 perf_session__fprintf_dsos(session, stderr);
 868                         exit(0);
 869                 case 's':
 870                         prompt_symbol(&sym_filter_entry, "Enter details symbol");
 871                         break;
 872                 case 'S':
 873                         if (!sym_filter_entry)
 874                                 break;
 875                         else {
 876                                 struct sym_entry *syme = sym_filter_entry;
 877
 878                                 pthread_mutex_lock(&syme->src->lock);
 879                                 sym_filter_entry = NULL;
 880                                 __zero_source_counters(syme);
 881                                 pthread_mutex_unlock(&syme->src->lock);
 882                         }
 883                         break;
 884                 case 'U':
 885                         hide_user_symbols = !hide_user_symbols;
 886                         break;
 887                 case 'w':
 888                         display_weighted = ~display_weighted;
 889                         break;
 890                 case 'z':
 891                         zero = !zero;
 892                         break;
 893                 default:
 894                         break;
 895         }
 896 }
 897
 898 static void *display_thread(void *arg __used)
 899 {
 900         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 901         struct termios tc, save;
 902         int delay_msecs, c;
 903         struct perf_session *session = (struct perf_session *) arg;
 904
 905         tcgetattr(0, &save);
 906         tc = save;
 907         tc.c_lflag &= ~(ICANON | ECHO);
 908         tc.c_cc[VMIN] = 0;
 909         tc.c_cc[VTIME] = 0;
 910
 911 repeat:
 912         delay_msecs = delay_secs * 1000;
 913         tcsetattr(0, TCSANOW, &tc);
 914         /* trash return*/
 915         getc(stdin);
 916
 917         do {
 918                 print_sym_table();
 919         } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
 920
 921         c = getc(stdin);
 922         tcsetattr(0, TCSAFLUSH, &save);
 923
 924         handle_keypress(session, c);
 925         goto repeat;
 926
 927         return NULL;
 928 }
 929
 930 /* Tag samples to be skipped. */
 931 static const char *skip_symbols[] = {
 932         "default_idle",
 933         "cpu_idle",
 934         "enter_idle",
 935         "exit_idle",
 936         "mwait_idle",
 937         "mwait_idle_with_hints",
 938         "poll_idle",
 939         "ppc64_runlatch_off",
 940         "pseries_dedicated_idle_sleep",
 941         NULL
 942 };
 943
 944 static int symbol_filter(struct map *map, struct symbol *sym)
 945 {
 946         struct sym_entry *syme;
 947         const char *name = sym->name;
 948         int i;
 949
 950         /*
 951          * ppc64 uses function descriptors and appends a '.' to the
 952          * start of every instruction address. Remove it.
 953          */
 954         if (name[0] == '.')
 955                 name++;
 956
 957         if (!strcmp(name, "_text") ||
 958             !strcmp(name, "_etext") ||
 959             !strcmp(name, "_sinittext") ||
 960             !strncmp("init_module", name, 11) ||
 961             !strncmp("cleanup_module", name, 14) ||
 962             strstr(name, "_text_start") ||
 963             strstr(name, "_text_end"))
 964                 return 1;
 965
 966         syme = symbol__priv(sym);
 967         syme->map = map;
 968         syme->src = NULL;
 969
 970         if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
 971                 /* schedule initial sym_filter_entry setup */
 972                 sym_filter_entry_sched = syme;
 973                 sym_filter = NULL;
 974         }
 975
 976         for (i = 0; skip_symbols[i]; i++) {
 977                 if (!strcmp(skip_symbols[i], name)) {
 978                         syme->skip = 1;
 979                         break;
 980                 }
 981         }
 982
 983         if (!syme->skip)
 984                 syme->name_len = strlen(sym->name);
 985
 986         return 0;
 987 }
 988
 989 static void event__process_sample(const event_t *self,
 990                                   struct sample_data *sample,
 991                                   struct perf_session *session,
 992                                   struct perf_evsel *evsel)
 993 {
 994         u64 ip = self->ip.ip;
 995         struct sym_entry *syme;
 996         struct addr_location al;
 997         struct machine *machine;
 998         u8 origin = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 999
1000         ++samples;
1001
1002         switch (origin) {
1003         case PERF_RECORD_MISC_USER:
1004                 ++us_samples;
1005                 if (hide_user_symbols)
1006                         return;
1007                 machine = perf_session__find_host_machine(session);
1008                 break;
1009         case PERF_RECORD_MISC_KERNEL:
1010                 ++kernel_samples;
1011                 if (hide_kernel_symbols)
1012                         return;
1013                 machine = perf_session__find_host_machine(session);
1014                 break;
1015         case PERF_RECORD_MISC_GUEST_KERNEL:
1016                 ++guest_kernel_samples;
1017                 machine = perf_session__find_machine(session, self->ip.pid);
1018                 break;
1019         case PERF_RECORD_MISC_GUEST_USER:
1020                 ++guest_us_samples;
1021                 /*
1022                  * TODO: we don't process guest user from host side
1023                  * except simple counting.
1024                  */
1025                 return;
1026         default:
1027                 return;
1028         }
1029
1030         if (!machine && perf_guest) {
1031                 pr_err("Can't find guest [%d]'s kernel information\n",
1032                         self->ip.pid);
1033                 return;
1034         }
1035
1036         if (self->header.misc & PERF_RECORD_MISC_EXACT_IP)
1037                 exact_samples++;
1038
1039         if (event__preprocess_sample(self, session, &al, sample,
1040                                      symbol_filter) < 0 ||
1041             al.filtered)
1042                 return;
1043
1044         if (al.sym == NULL) {
1045                 /*
1046                  * As we do lazy loading of symtabs we only will know if the
1047                  * specified vmlinux file is invalid when we actually have a
1048                  * hit in kernel space and then try to load it. So if we get
1049                  * here and there are _no_ symbols in the DSO backing the
1050                  * kernel map, bail out.
1051                  *
1052                  * We may never get here, for instance, if we use -K/
1053                  * --hide-kernel-symbols, even if the user specifies an
1054                  * invalid --vmlinux ;-)
1055                  */
1056                 if (al.map == machine->vmlinux_maps[MAP__FUNCTION] &&
1057                     RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION])) {
1058                         pr_err("The %s file can't be used\n",
1059                                symbol_conf.vmlinux_name);
1060                         exit(1);
1061                 }
1062
1063                 return;
1064         }
1065
1066         /* let's see, whether we need to install initial sym_filter_entry */
1067         if (sym_filter_entry_sched) {
1068                 sym_filter_entry = sym_filter_entry_sched;
1069                 sym_filter_entry_sched = NULL;
1070                 if (parse_source(sym_filter_entry) < 0) {
1071                         struct symbol *sym = sym_entry__symbol(sym_filter_entry);
1072
1073                         pr_err("Can't annotate %s", sym->name);
1074                         if (sym_filter_entry->map->dso->origin == DSO__ORIG_KERNEL) {
1075                                 pr_err(": No vmlinux file was found in the path:\n");
1076                                 machine__fprintf_vmlinux_path(machine, stderr);
1077                         } else
1078                                 pr_err(".\n");
1079                         exit(1);
1080                 }
1081         }
1082
1083         syme = symbol__priv(al.sym);
1084         if (!syme->skip) {
1085                 syme->count[evsel->idx]++;
1086                 syme->origin = origin;
1087                 record_precise_ip(syme, evsel->idx, ip);
1088                 pthread_mutex_lock(&active_symbols_lock);
1089                 if (list_empty(&syme->node) || !syme->node.next)
1090                         __list_insert_active_sym(syme);
1091                 pthread_mutex_unlock(&active_symbols_lock);
1092         }
1093 }
1094
1095 struct mmap_data {
1096         void                    *base;
1097         int                     mask;
1098         unsigned int            prev;
1099 };
1100
1101 static int perf_evsel__alloc_mmap_per_thread(struct perf_evsel *evsel,
1102                                              int ncpus, int nthreads)
1103 {
1104         evsel->priv = xyarray__new(ncpus, nthreads, sizeof(struct mmap_data));
1105         return evsel->priv != NULL ? 0 : -ENOMEM;
1106 }
1107
1108 static void perf_evsel__free_mmap(struct perf_evsel *evsel)
1109 {
1110         xyarray__delete(evsel->priv);
1111         evsel->priv = NULL;
1112 }
1113
1114 static unsigned int mmap_read_head(struct mmap_data *md)
1115 {
1116         struct perf_event_mmap_page *pc = md->base;
1117         int head;
1118
1119         head = pc->data_head;
1120         rmb();
1121
1122         return head;
1123 }
1124
1125 static void perf_session__mmap_read_counter(struct perf_session *self,
1126                                             struct perf_evsel *evsel,
1127                                             int cpu, int thread_idx)
1128 {
1129         struct xyarray *mmap_array = evsel->priv;
1130         struct mmap_data *md = xyarray__entry(mmap_array, cpu, thread_idx);
1131         unsigned int head = mmap_read_head(md);
1132         unsigned int old = md->prev;
1133         unsigned char *data = md->base + page_size;
1134         struct sample_data sample;
1135         int diff;
1136
1137         /*
1138          * If we're further behind than half the buffer, there's a chance
1139          * the writer will bite our tail and mess up the samples under us.
1140          *
1141          * If we somehow ended up ahead of the head, we got messed up.
1142          *
1143          * In either case, truncate and restart at head.
1144          */
1145         diff = head - old;
1146         if (diff > md->mask / 2 || diff < 0) {
1147                 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
1148
1149                 /*
1150                  * head points to a known good entry, start there.
1151                  */
1152                 old = head;
1153         }
1154
1155         for (; old != head;) {
1156                 event_t *event = (event_t *)&data[old & md->mask];
1157
1158                 event_t event_copy;
1159
1160                 size_t size = event->header.size;
1161
1162                 /*
1163                  * Event straddles the mmap boundary -- header should always
1164                  * be inside due to u64 alignment of output.
1165                  */
1166                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
1167                         unsigned int offset = old;
1168                         unsigned int len = min(sizeof(*event), size), cpy;
1169                         void *dst = &event_copy;
1170
1171                         do {
1172                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
1173                                 memcpy(dst, &data[offset & md->mask], cpy);
1174                                 offset += cpy;
1175                                 dst += cpy;
1176                                 len -= cpy;
1177                         } while (len);
1178
1179                         event = &event_copy;
1180                 }
1181
1182                 event__parse_sample(event, self, &sample);
1183                 if (event->header.type == PERF_RECORD_SAMPLE)
1184                         event__process_sample(event, &sample, self, evsel);
1185                 else
1186                         event__process(event, &sample, self);
1187                 old += size;
1188         }
1189
1190         md->prev = old;
1191 }
1192
1193 static struct pollfd *event_array;
1194
1195 static void perf_session__mmap_read(struct perf_session *self)
1196 {
1197         struct perf_evsel *counter;
1198         int i, thread_index;
1199
1200         for (i = 0; i < cpus->nr; i++) {
1201                 list_for_each_entry(counter, &evsel_list, node) {
1202                         for (thread_index = 0;
1203                                 thread_index < threads->nr;
1204                                 thread_index++) {
1205                                 perf_session__mmap_read_counter(self,
1206                                         counter, i, thread_index);
1207                         }
1208                 }
1209         }
1210 }
1211
1212 int nr_poll;
1213 int group_fd;
1214
1215 static void start_counter(int i, struct perf_evsel *evsel)
1216 {
1217         struct xyarray *mmap_array = evsel->priv;
1218         struct mmap_data *mm;
1219         struct perf_event_attr *attr;
1220         int cpu = -1;
1221         int thread_index;
1222
1223         if (target_tid == -1)
1224                 cpu = cpus->map[i];
1225
1226         attr = &evsel->attr;
1227
1228         attr->sample_type       = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1229
1230         if (freq) {
1231                 attr->sample_type       |= PERF_SAMPLE_PERIOD;
1232                 attr->freq              = 1;
1233                 attr->sample_freq       = freq;
1234         }
1235
1236         attr->inherit           = (cpu < 0) && inherit;
1237         attr->mmap              = 1;
1238
1239         for (thread_index = 0; thread_index < threads->nr; thread_index++) {
1240 try_again:
1241                 FD(evsel, i, thread_index) = sys_perf_event_open(attr,
1242                                 threads->map[thread_index], cpu, group_fd, 0);
1243
1244                 if (FD(evsel, i, thread_index) < 0) {
1245                         int err = errno;
1246
1247                         if (err == EPERM || err == EACCES)
1248                                 die("Permission error - are you root?\n"
1249                                         "\t Consider tweaking"
1250                                         " /proc/sys/kernel/perf_event_paranoid.\n");
1251                         /*
1252                          * If it's cycles then fall back to hrtimer
1253                          * based cpu-clock-tick sw counter, which
1254                          * is always available even if no PMU support:
1255                          */
1256                         if (attr->type == PERF_TYPE_HARDWARE
1257                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1258
1259                                 if (verbose)
1260                                         warning(" ... trying to fall back to cpu-clock-ticks\n");
1261
1262                                 attr->type = PERF_TYPE_SOFTWARE;
1263                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
1264                                 goto try_again;
1265                         }
1266                         printf("\n");
1267                         error("sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information.\n",
1268                                         FD(evsel, i, thread_index), strerror(err));
1269                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1270                         exit(-1);
1271                 }
1272                 assert(FD(evsel, i, thread_index) >= 0);
1273                 fcntl(FD(evsel, i, thread_index), F_SETFL, O_NONBLOCK);
1274
1275                 /*
1276                  * First counter acts as the group leader:
1277                  */
1278                 if (group && group_fd == -1)
1279                         group_fd = FD(evsel, i, thread_index);
1280
1281                 event_array[nr_poll].fd = FD(evsel, i, thread_index);
1282                 event_array[nr_poll].events = POLLIN;
1283                 nr_poll++;
1284
1285                 mm = xyarray__entry(mmap_array, i, thread_index);
1286                 mm->prev = 0;
1287                 mm->mask = mmap_pages*page_size - 1;
1288                 mm->base = mmap(NULL, (mmap_pages+1)*page_size,
1289                                 PROT_READ, MAP_SHARED, FD(evsel, i, thread_index), 0);
1290                 if (mm->base == MAP_FAILED)
1291                         die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1292         }
1293 }
1294
1295 static int __cmd_top(void)
1296 {
1297         pthread_t thread;
1298         struct perf_evsel *counter;
1299         int i, ret;
1300         /*
1301          * FIXME: perf_session__new should allow passing a O_MMAP, so that all this
1302          * mmap reading, etc is encapsulated in it. Use O_WRONLY for now.
1303          */
1304         struct perf_session *session = perf_session__new(NULL, O_WRONLY, false, false, NULL);
1305         if (session == NULL)
1306                 return -ENOMEM;
1307
1308         if (target_tid != -1)
1309                 event__synthesize_thread_map(threads, event__process, session);
1310         else
1311                 event__synthesize_threads(event__process, session);
1312
1313         for (i = 0; i < cpus->nr; i++) {
1314                 group_fd = -1;
1315                 list_for_each_entry(counter, &evsel_list, node)
1316                         start_counter(i, counter);
1317         }
1318
1319         /* Wait for a minimal set of events before starting the snapshot */
1320         poll(&event_array[0], nr_poll, 100);
1321
1322         perf_session__mmap_read(session);
1323
1324         if (pthread_create(&thread, NULL, display_thread, session)) {
1325                 printf("Could not create display thread.\n");
1326                 exit(-1);
1327         }
1328
1329         if (realtime_prio) {
1330                 struct sched_param param;
1331
1332                 param.sched_priority = realtime_prio;
1333                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1334                         printf("Could not set realtime priority.\n");
1335                         exit(-1);
1336                 }
1337         }
1338
1339         while (1) {
1340                 int hits = samples;
1341
1342                 perf_session__mmap_read(session);
1343
1344                 if (hits == samples)
1345                         ret = poll(event_array, nr_poll, 100);
1346         }
1347
1348         return 0;
1349 }
1350
1351 static const char * const top_usage[] = {
1352         "perf top [<options>]",
1353         NULL
1354 };
1355
1356 static const struct option options[] = {
1357         OPT_CALLBACK('e', "event", NULL, "event",
1358                      "event selector. use 'perf list' to list available events",
1359                      parse_events),
1360         OPT_INTEGER('c', "count", &default_interval,
1361                     "event period to sample"),
1362         OPT_INTEGER('p', "pid", &target_pid,
1363                     "profile events on existing process id"),
1364         OPT_INTEGER('t', "tid", &target_tid,
1365                     "profile events on existing thread id"),
1366         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1367                             "system-wide collection from all CPUs"),
1368         OPT_STRING('C', "cpu", &cpu_list, "cpu",
1369                     "list of cpus to monitor"),
1370         OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
1371                    "file", "vmlinux pathname"),
1372         OPT_BOOLEAN('K', "hide_kernel_symbols", &hide_kernel_symbols,
1373                     "hide kernel symbols"),
1374         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
1375         OPT_INTEGER('r', "realtime", &realtime_prio,
1376                     "collect data with this RT SCHED_FIFO priority"),
1377         OPT_INTEGER('d', "delay", &delay_secs,
1378                     "number of seconds to delay between refreshes"),
1379         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1380                             "dump the symbol table used for profiling"),
1381         OPT_INTEGER('f', "count-filter", &count_filter,
1382                     "only display functions with more events than this"),
1383         OPT_BOOLEAN('g', "group", &group,
1384                             "put the counters into a counter group"),
1385         OPT_BOOLEAN('i', "inherit", &inherit,
1386                     "child tasks inherit counters"),
1387         OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1388                     "symbol to annotate"),
1389         OPT_BOOLEAN('z', "zero", &zero,
1390                     "zero history across updates"),
1391         OPT_INTEGER('F', "freq", &freq,
1392                     "profile at this frequency"),
1393         OPT_INTEGER('E', "entries", &print_entries,
1394                     "display this many functions"),
1395         OPT_BOOLEAN('U', "hide_user_symbols", &hide_user_symbols,
1396                     "hide user symbols"),
1397         OPT_INCR('v', "verbose", &verbose,
1398                     "be more verbose (show counter open errors, etc)"),
1399         OPT_END()
1400 };
1401
1402 int cmd_top(int argc, const char **argv, const char *prefix __used)
1403 {
1404         struct perf_evsel *pos;
1405         int status = -ENOMEM;
1406
1407         page_size = sysconf(_SC_PAGE_SIZE);
1408
1409         argc = parse_options(argc, argv, options, top_usage, 0);
1410         if (argc)
1411                 usage_with_options(top_usage, options);
1412
1413         if (target_pid != -1)
1414                 target_tid = target_pid;
1415
1416         threads = thread_map__new(target_pid, target_tid);
1417         if (threads == NULL) {
1418                 pr_err("Problems finding threads of monitor\n");
1419                 usage_with_options(top_usage, options);
1420         }
1421
1422         event_array = malloc((sizeof(struct pollfd) *
1423                               MAX_NR_CPUS * MAX_COUNTERS * threads->nr));
1424         if (!event_array)
1425                 return -ENOMEM;
1426
1427         /* CPU and PID are mutually exclusive */
1428         if (target_tid > 0 && cpu_list) {
1429                 printf("WARNING: PID switch overriding CPU\n");
1430                 sleep(1);
1431                 cpu_list = NULL;
1432         }
1433
1434         if (!nr_counters && perf_evsel_list__create_default() < 0) {
1435                 pr_err("Not enough memory for event selector list\n");
1436                 return -ENOMEM;
1437         }
1438
1439         if (delay_secs < 1)
1440                 delay_secs = 1;
1441
1442         /*
1443          * User specified count overrides default frequency.
1444          */
1445         if (default_interval)
1446                 freq = 0;
1447         else if (freq) {
1448                 default_interval = freq;
1449         } else {
1450                 fprintf(stderr, "frequency and count are zero, aborting\n");
1451                 exit(EXIT_FAILURE);
1452         }
1453
1454         if (target_tid != -1)
1455                 cpus = cpu_map__dummy_new();
1456         else
1457                 cpus = cpu_map__new(cpu_list);
1458
1459         if (cpus == NULL)
1460                 usage_with_options(top_usage, options);
1461
1462         list_for_each_entry(pos, &evsel_list, node) {
1463                 if (perf_evsel__alloc_mmap_per_thread(pos, cpus->nr, threads->nr) < 0 ||
1464                     perf_evsel__alloc_fd(pos, cpus->nr, threads->nr) < 0)
1465                         goto out_free_fd;
1466                 /*
1467                  * Fill in the ones not specifically initialized via -c:
1468                  */
1469                 if (pos->attr.sample_period)
1470                         continue;
1471
1472                 pos->attr.sample_period = default_interval;
1473         }
1474
1475         sym_evsel = list_entry(evsel_list.next, struct perf_evsel, node);
1476
1477         symbol_conf.priv_size = (sizeof(struct sym_entry) +
1478                                  (nr_counters + 1) * sizeof(unsigned long));
1479
1480         symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
1481         if (symbol__init() < 0)
1482                 return -1;
1483
1484         get_term_dimensions(&winsize);
1485         if (print_entries == 0) {
1486                 update_print_entries(&winsize);
1487                 signal(SIGWINCH, sig_winch_handler);
1488         }
1489
1490         status = __cmd_top();
1491 out_free_fd:
1492         list_for_each_entry(pos, &evsel_list, node)
1493                 perf_evsel__free_mmap(pos);
1494         perf_evsel_list__delete();
1495
1496         return status;
1497 }