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