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/util.h"
  26 #include <linux/rbtree.h>
  27 #include "util/parse-options.h"
  28 #include "util/parse-events.h"
  29
  30 #include <assert.h>
  31 #include <fcntl.h>
  32
  33 #include <stdio.h>
  34 #include <termios.h>
  35 #include <unistd.h>
  36
  37 #include <errno.h>
  38 #include <time.h>
  39 #include <sched.h>
  40 #include <pthread.h>
  41
  42 #include <sys/syscall.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/poll.h>
  45 #include <sys/prctl.h>
  46 #include <sys/wait.h>
  47 #include <sys/uio.h>
  48 #include <sys/mman.h>
  49
  50 #include <linux/unistd.h>
  51 #include <linux/types.h>
  52
  53 static int                      fd[MAX_NR_CPUS][MAX_COUNTERS];
  54
  55 static int                      system_wide                     =  0;
  56
  57 static int                      default_interval                = 100000;
  58
  59 static int                      count_filter                    =  5;
  60 static int                      print_entries                   = 15;
  61
  62 static int                      target_pid                      = -1;
  63 static int                      inherit                         =  0;
  64 static int                      profile_cpu                     = -1;
  65 static int                      nr_cpus                         =  0;
  66 static unsigned int             realtime_prio                   =  0;
  67 static int                      group                           =  0;
  68 static unsigned int             page_size;
  69 static unsigned int             mmap_pages                      = 16;
  70 static int                      freq                            =  0;
  71 static int                      verbose                         =  0;
  72 static char                     *vmlinux                        =  NULL;
  73
  74 static int                      delay_secs                      =  2;
  75 static int                      zero;
  76 static int                      dump_symtab;
  77
  78 /*
  79  * Source
  80  */
  81
  82 struct source_line {
  83         u64                     eip;
  84         unsigned long           count[MAX_COUNTERS];
  85         char                    *line;
  86         struct source_line      *next;
  87 };
  88
  89 static char                     *sym_filter                     =  NULL;
  90 struct sym_entry                *sym_filter_entry               =  NULL;
  91 static int                      sym_pcnt_filter                 =  5;
  92 static int                      sym_counter                     =  0;
  93 static int                      display_weighted                = -1;
  94
  95 /*
  96  * Symbols
  97  */
  98
  99 static u64                      min_ip;
 100 static u64                      max_ip = -1ll;
 101
 102 struct sym_entry {
 103         struct rb_node          rb_node;
 104         struct list_head        node;
 105         unsigned long           count[MAX_COUNTERS];
 106         unsigned long           snap_count;
 107         double                  weight;
 108         int                     skip;
 109         struct source_line      *source;
 110         struct source_line      *lines;
 111         struct source_line      **lines_tail;
 112         pthread_mutex_t         source_lock;
 113 };
 114
 115 /*
 116  * Source functions
 117  */
 118
 119 static void parse_source(struct sym_entry *syme)
 120 {
 121         struct symbol *sym;
 122         struct module *module;
 123         struct section *section = NULL;
 124         FILE *file;
 125         char command[PATH_MAX*2], *path = vmlinux;
 126         u64 start, end, len;
 127
 128         if (!syme)
 129                 return;
 130
 131         if (syme->lines) {
 132                 pthread_mutex_lock(&syme->source_lock);
 133                 goto out_assign;
 134         }
 135
 136         sym = (struct symbol *)(syme + 1);
 137         module = sym->module;
 138
 139         if (module)
 140                 path = module->path;
 141         if (!path)
 142                 return;
 143
 144         start = sym->obj_start;
 145         if (!start)
 146                 start = sym->start;
 147
 148         if (module) {
 149                 section = module->sections->find_section(module->sections, ".text");
 150                 if (section)
 151                         start -= section->vma;
 152         }
 153
 154         end = start + sym->end - sym->start + 1;
 155         len = sym->end - sym->start;
 156
 157         sprintf(command, "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS %s", start, end, path);
 158
 159         file = popen(command, "r");
 160         if (!file)
 161                 return;
 162
 163         pthread_mutex_lock(&syme->source_lock);
 164         syme->lines_tail = &syme->lines;
 165         while (!feof(file)) {
 166                 struct source_line *src;
 167                 size_t dummy = 0;
 168                 char *c;
 169
 170                 src = malloc(sizeof(struct source_line));
 171                 assert(src != NULL);
 172                 memset(src, 0, sizeof(struct source_line));
 173
 174                 if (getline(&src->line, &dummy, file) < 0)
 175                         break;
 176                 if (!src->line)
 177                         break;
 178
 179                 c = strchr(src->line, '\n');
 180                 if (c)
 181                         *c = 0;
 182
 183                 src->next = NULL;
 184                 *syme->lines_tail = src;
 185                 syme->lines_tail = &src->next;
 186
 187                 if (strlen(src->line)>8 && src->line[8] == ':') {
 188                         src->eip = strtoull(src->line, NULL, 16);
 189                         if (section)
 190                                 src->eip += section->vma;
 191                 }
 192                 if (strlen(src->line)>8 && src->line[16] == ':') {
 193                         src->eip = strtoull(src->line, NULL, 16);
 194                         if (section)
 195                                 src->eip += section->vma;
 196                 }
 197         }
 198         pclose(file);
 199 out_assign:
 200         sym_filter_entry = syme;
 201         pthread_mutex_unlock(&syme->source_lock);
 202 }
 203
 204 static void __zero_source_counters(struct sym_entry *syme)
 205 {
 206         int i;
 207         struct source_line *line;
 208
 209         line = syme->lines;
 210         while (line) {
 211                 for (i = 0; i < nr_counters; i++)
 212                         line->count[i] = 0;
 213                 line = line->next;
 214         }
 215 }
 216
 217 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
 218 {
 219         struct source_line *line;
 220
 221         if (syme != sym_filter_entry)
 222                 return;
 223
 224         if (pthread_mutex_trylock(&syme->source_lock))
 225                 return;
 226
 227         if (!syme->source)
 228                 goto out_unlock;
 229
 230         for (line = syme->lines; line; line = line->next) {
 231                 if (line->eip == ip) {
 232                         line->count[counter]++;
 233                         break;
 234                 }
 235                 if (line->eip > ip)
 236                         break;
 237         }
 238 out_unlock:
 239         pthread_mutex_unlock(&syme->source_lock);
 240 }
 241
 242 static void lookup_sym_source(struct sym_entry *syme)
 243 {
 244         struct symbol *symbol = (struct symbol *)(syme + 1);
 245         struct source_line *line;
 246         char pattern[PATH_MAX];
 247         char *idx;
 248
 249         sprintf(pattern, "<%s>:", symbol->name);
 250
 251         if (symbol->module) {
 252                 idx = strstr(pattern, "\t");
 253                 if (idx)
 254                         *idx = 0;
 255         }
 256
 257         pthread_mutex_lock(&syme->source_lock);
 258         for (line = syme->lines; line; line = line->next) {
 259                 if (strstr(line->line, pattern)) {
 260                         syme->source = line;
 261                         break;
 262                 }
 263         }
 264         pthread_mutex_unlock(&syme->source_lock);
 265 }
 266
 267 static void show_lines(struct source_line *queue, int count, int total)
 268 {
 269         int i;
 270         struct source_line *line;
 271
 272         line = queue;
 273         for (i = 0; i < count; i++) {
 274                 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
 275
 276                 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
 277                 line = line->next;
 278         }
 279 }
 280
 281 #define TRACE_COUNT     3
 282
 283 static void show_details(struct sym_entry *syme)
 284 {
 285         struct symbol *symbol;
 286         struct source_line *line;
 287         struct source_line *line_queue = NULL;
 288         int displayed = 0;
 289         int line_queue_count = 0, total = 0, more = 0;
 290
 291         if (!syme)
 292                 return;
 293
 294         if (!syme->source)
 295                 lookup_sym_source(syme);
 296
 297         if (!syme->source)
 298                 return;
 299
 300         symbol = (struct symbol *)(syme + 1);
 301         printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
 302         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
 303
 304         pthread_mutex_lock(&syme->source_lock);
 305         line = syme->source;
 306         while (line) {
 307                 total += line->count[sym_counter];
 308                 line = line->next;
 309         }
 310
 311         line = syme->source;
 312         while (line) {
 313                 float pcnt = 0.0;
 314
 315                 if (!line_queue_count)
 316                         line_queue = line;
 317                 line_queue_count++;
 318
 319                 if (line->count[sym_counter])
 320                         pcnt = 100.0 * line->count[sym_counter] / (float)total;
 321                 if (pcnt >= (float)sym_pcnt_filter) {
 322                         if (displayed <= print_entries)
 323                                 show_lines(line_queue, line_queue_count, total);
 324                         else more++;
 325                         displayed += line_queue_count;
 326                         line_queue_count = 0;
 327                         line_queue = NULL;
 328                 } else if (line_queue_count > TRACE_COUNT) {
 329                         line_queue = line_queue->next;
 330                         line_queue_count--;
 331                 }
 332
 333                 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
 334                 line = line->next;
 335         }
 336         pthread_mutex_unlock(&syme->source_lock);
 337         if (more)
 338                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 339 }
 340
 341 struct dso                      *kernel_dso;
 342
 343 /*
 344  * Symbols will be added here in record_ip and will get out
 345  * after decayed.
 346  */
 347 static LIST_HEAD(active_symbols);
 348 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
 349
 350 /*
 351  * Ordering weight: count-1 * count-2 * ... / count-n
 352  */
 353 static double sym_weight(const struct sym_entry *sym)
 354 {
 355         double weight = sym->snap_count;
 356         int counter;
 357
 358         if (!display_weighted)
 359                 return weight;
 360
 361         for (counter = 1; counter < nr_counters-1; counter++)
 362                 weight *= sym->count[counter];
 363
 364         weight /= (sym->count[counter] + 1);
 365
 366         return weight;
 367 }
 368
 369 static long                     samples;
 370 static long                     userspace_samples;
 371 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
 372
 373 static void __list_insert_active_sym(struct sym_entry *syme)
 374 {
 375         list_add(&syme->node, &active_symbols);
 376 }
 377
 378 static void list_remove_active_sym(struct sym_entry *syme)
 379 {
 380         pthread_mutex_lock(&active_symbols_lock);
 381         list_del_init(&syme->node);
 382         pthread_mutex_unlock(&active_symbols_lock);
 383 }
 384
 385 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
 386 {
 387         struct rb_node **p = &tree->rb_node;
 388         struct rb_node *parent = NULL;
 389         struct sym_entry *iter;
 390
 391         while (*p != NULL) {
 392                 parent = *p;
 393                 iter = rb_entry(parent, struct sym_entry, rb_node);
 394
 395                 if (se->weight > iter->weight)
 396                         p = &(*p)->rb_left;
 397                 else
 398                         p = &(*p)->rb_right;
 399         }
 400
 401         rb_link_node(&se->rb_node, parent, p);
 402         rb_insert_color(&se->rb_node, tree);
 403 }
 404
 405 static void print_sym_table(void)
 406 {
 407         int printed = 0, j;
 408         int counter, snap = !display_weighted ? sym_counter : 0;
 409         float samples_per_sec = samples/delay_secs;
 410         float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
 411         float sum_ksamples = 0.0;
 412         struct sym_entry *syme, *n;
 413         struct rb_root tmp = RB_ROOT;
 414         struct rb_node *nd;
 415
 416         samples = userspace_samples = 0;
 417
 418         /* Sort the active symbols */
 419         pthread_mutex_lock(&active_symbols_lock);
 420         syme = list_entry(active_symbols.next, struct sym_entry, node);
 421         pthread_mutex_unlock(&active_symbols_lock);
 422
 423         list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
 424                 syme->snap_count = syme->count[snap];
 425                 if (syme->snap_count != 0) {
 426                         syme->weight = sym_weight(syme);
 427                         rb_insert_active_sym(&tmp, syme);
 428                         sum_ksamples += syme->snap_count;
 429
 430                         for (j = 0; j < nr_counters; j++)
 431                                 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
 432                 } else
 433                         list_remove_active_sym(syme);
 434         }
 435
 436         puts(CONSOLE_CLEAR);
 437
 438         printf(
 439 "------------------------------------------------------------------------------\n");
 440         printf( "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% [",
 441                 samples_per_sec,
 442                 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
 443
 444         if (nr_counters == 1 || !display_weighted) {
 445                 printf("%Ld", (u64)attrs[0].sample_period);
 446                 if (freq)
 447                         printf("Hz ");
 448                 else
 449                         printf(" ");
 450         }
 451
 452         if (!display_weighted)
 453                 printf("%s", event_name(sym_counter));
 454         else for (counter = 0; counter < nr_counters; counter++) {
 455                 if (counter)
 456                         printf("/");
 457
 458                 printf("%s", event_name(counter));
 459         }
 460
 461         printf( "], ");
 462
 463         if (target_pid != -1)
 464                 printf(" (target_pid: %d", target_pid);
 465         else
 466                 printf(" (all");
 467
 468         if (profile_cpu != -1)
 469                 printf(", cpu: %d)\n", profile_cpu);
 470         else {
 471                 if (target_pid != -1)
 472                         printf(")\n");
 473                 else
 474                         printf(", %d CPUs)\n", nr_cpus);
 475         }
 476
 477         printf("------------------------------------------------------------------------------\n\n");
 478
 479         if (sym_filter_entry) {
 480                 show_details(sym_filter_entry);
 481                 return;
 482         }
 483
 484         if (nr_counters == 1)
 485                 printf("             samples    pcnt");
 486         else
 487                 printf("  weight     samples    pcnt");
 488
 489         printf("         RIP          kernel function\n"
 490                        "  ______     _______   _____   ________________   _______________\n\n"
 491         );
 492
 493         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
 494                 struct sym_entry *syme = rb_entry(nd, struct sym_entry, rb_node);
 495                 struct symbol *sym = (struct symbol *)(syme + 1);
 496                 double pcnt;
 497
 498                 if (++printed > print_entries || (int)syme->snap_count < count_filter)
 499                         continue;
 500
 501                 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
 502                                          sum_ksamples));
 503
 504                 if (nr_counters == 1 || !display_weighted)
 505                         printf("%20.2f - ", syme->weight);
 506                 else
 507                         printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
 508
 509                 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
 510                 printf(" - %016llx : %s", sym->start, sym->name);
 511                 if (sym->module)
 512                         printf("\t[%s]", sym->module->name);
 513                 printf("\n");
 514         }
 515 }
 516
 517 static void prompt_integer(int *target, const char *msg)
 518 {
 519         char *buf = malloc(0), *p;
 520         size_t dummy = 0;
 521         int tmp;
 522
 523         fprintf(stdout, "\n%s: ", msg);
 524         if (getline(&buf, &dummy, stdin) < 0)
 525                 return;
 526
 527         p = strchr(buf, '\n');
 528         if (p)
 529                 *p = 0;
 530
 531         p = buf;
 532         while(*p) {
 533                 if (!isdigit(*p))
 534                         goto out_free;
 535                 p++;
 536         }
 537         tmp = strtoul(buf, NULL, 10);
 538         *target = tmp;
 539 out_free:
 540         free(buf);
 541 }
 542
 543 static void prompt_percent(int *target, const char *msg)
 544 {
 545         int tmp = 0;
 546
 547         prompt_integer(&tmp, msg);
 548         if (tmp >= 0 && tmp <= 100)
 549                 *target = tmp;
 550 }
 551
 552 static void prompt_symbol(struct sym_entry **target, const char *msg)
 553 {
 554         char *buf = malloc(0), *p;
 555         struct sym_entry *syme = *target, *n, *found = NULL;
 556         size_t dummy = 0;
 557
 558         /* zero counters of active symbol */
 559         if (syme) {
 560                 pthread_mutex_lock(&syme->source_lock);
 561                 __zero_source_counters(syme);
 562                 *target = NULL;
 563                 pthread_mutex_unlock(&syme->source_lock);
 564         }
 565
 566         fprintf(stdout, "\n%s: ", msg);
 567         if (getline(&buf, &dummy, stdin) < 0)
 568                 goto out_free;
 569
 570         p = strchr(buf, '\n');
 571         if (p)
 572                 *p = 0;
 573
 574         pthread_mutex_lock(&active_symbols_lock);
 575         syme = list_entry(active_symbols.next, struct sym_entry, node);
 576         pthread_mutex_unlock(&active_symbols_lock);
 577
 578         list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
 579                 struct symbol *sym = (struct symbol *)(syme + 1);
 580
 581                 if (!strcmp(buf, sym->name)) {
 582                         found = syme;
 583                         break;
 584                 }
 585         }
 586
 587         if (!found) {
 588                 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
 589                 sleep(1);
 590                 return;
 591         } else
 592                 parse_source(found);
 593
 594 out_free:
 595         free(buf);
 596 }
 597
 598 static void print_mapped_keys(void)
 599 {
 600         char *name = NULL;
 601
 602         if (sym_filter_entry) {
 603                 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
 604                 name = sym->name;
 605         }
 606
 607         fprintf(stdout, "\nMapped keys:\n");
 608         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", delay_secs);
 609         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", print_entries);
 610
 611         if (nr_counters > 1)
 612                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(sym_counter));
 613
 614         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", count_filter);
 615
 616         if (vmlinux) {
 617                 fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
 618                 fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 619                 fprintf(stdout, "\t[S]     stop annotation.\n");
 620         }
 621
 622         if (nr_counters > 1)
 623                 fprintf(stdout, "\t[w]     toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
 624
 625         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", zero ? 1 : 0);
 626         fprintf(stdout, "\t[qQ]    quit.\n");
 627 }
 628
 629 static int key_mapped(int c)
 630 {
 631         switch (c) {
 632                 case 'd':
 633                 case 'e':
 634                 case 'f':
 635                 case 'z':
 636                 case 'q':
 637                 case 'Q':
 638                         return 1;
 639                 case 'E':
 640                 case 'w':
 641                         return nr_counters > 1 ? 1 : 0;
 642                 case 'F':
 643                 case 's':
 644                 case 'S':
 645                         return vmlinux ? 1 : 0;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static void handle_keypress(int c)
 652 {
 653         if (!key_mapped(c)) {
 654                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 655                 struct termios tc, save;
 656
 657                 print_mapped_keys();
 658                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 659                 fflush(stdout);
 660
 661                 tcgetattr(0, &save);
 662                 tc = save;
 663                 tc.c_lflag &= ~(ICANON | ECHO);
 664                 tc.c_cc[VMIN] = 0;
 665                 tc.c_cc[VTIME] = 0;
 666                 tcsetattr(0, TCSANOW, &tc);
 667
 668                 poll(&stdin_poll, 1, -1);
 669                 c = getc(stdin);
 670
 671                 tcsetattr(0, TCSAFLUSH, &save);
 672                 if (!key_mapped(c))
 673                         return;
 674         }
 675
 676         switch (c) {
 677                 case 'd':
 678                         prompt_integer(&delay_secs, "Enter display delay");
 679                         break;
 680                 case 'e':
 681                         prompt_integer(&print_entries, "Enter display entries (lines)");
 682                         break;
 683                 case 'E':
 684                         if (nr_counters > 1) {
 685                                 int i;
 686
 687                                 fprintf(stderr, "\nAvailable events:");
 688                                 for (i = 0; i < nr_counters; i++)
 689                                         fprintf(stderr, "\n\t%d %s", i, event_name(i));
 690
 691                                 prompt_integer(&sym_counter, "Enter details event counter");
 692
 693                                 if (sym_counter >= nr_counters) {
 694                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
 695                                         sym_counter = 0;
 696                                         sleep(1);
 697                                 }
 698                         } else sym_counter = 0;
 699                         break;
 700                 case 'f':
 701                         prompt_integer(&count_filter, "Enter display event count filter");
 702                         break;
 703                 case 'F':
 704                         prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
 705                         break;
 706                 case 'q':
 707                 case 'Q':
 708                         printf("exiting.\n");
 709                         exit(0);
 710                 case 's':
 711                         prompt_symbol(&sym_filter_entry, "Enter details symbol");
 712                         break;
 713                 case 'S':
 714                         if (!sym_filter_entry)
 715                                 break;
 716                         else {
 717                                 struct sym_entry *syme = sym_filter_entry;
 718
 719                                 pthread_mutex_lock(&syme->source_lock);
 720                                 sym_filter_entry = NULL;
 721                                 __zero_source_counters(syme);
 722                                 pthread_mutex_unlock(&syme->source_lock);
 723                         }
 724                         break;
 725                 case 'w':
 726                         display_weighted = ~display_weighted;
 727                         break;
 728                 case 'z':
 729                         zero = ~zero;
 730                         break;
 731         }
 732 }
 733
 734 static void *display_thread(void *arg __used)
 735 {
 736         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 737         struct termios tc, save;
 738         int delay_msecs, c;
 739
 740         tcgetattr(0, &save);
 741         tc = save;
 742         tc.c_lflag &= ~(ICANON | ECHO);
 743         tc.c_cc[VMIN] = 0;
 744         tc.c_cc[VTIME] = 0;
 745
 746 repeat:
 747         delay_msecs = delay_secs * 1000;
 748         tcsetattr(0, TCSANOW, &tc);
 749         /* trash return*/
 750         getc(stdin);
 751
 752         do {
 753                 print_sym_table();
 754         } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
 755
 756         c = getc(stdin);
 757         tcsetattr(0, TCSAFLUSH, &save);
 758
 759         handle_keypress(c);
 760         goto repeat;
 761
 762         return NULL;
 763 }
 764
 765 /* Tag samples to be skipped. */
 766 static const char *skip_symbols[] = {
 767         "default_idle",
 768         "cpu_idle",
 769         "enter_idle",
 770         "exit_idle",
 771         "mwait_idle",
 772         "mwait_idle_with_hints",
 773         "ppc64_runlatch_off",
 774         "pseries_dedicated_idle_sleep",
 775         NULL
 776 };
 777
 778 static int symbol_filter(struct dso *self, struct symbol *sym)
 779 {
 780         struct sym_entry *syme;
 781         const char *name = sym->name;
 782         int i;
 783
 784         /*
 785          * ppc64 uses function descriptors and appends a '.' to the
 786          * start of every instruction address. Remove it.
 787          */
 788         if (name[0] == '.')
 789                 name++;
 790
 791         if (!strcmp(name, "_text") ||
 792             !strcmp(name, "_etext") ||
 793             !strcmp(name, "_sinittext") ||
 794             !strncmp("init_module", name, 11) ||
 795             !strncmp("cleanup_module", name, 14) ||
 796             strstr(name, "_text_start") ||
 797             strstr(name, "_text_end"))
 798                 return 1;
 799
 800         syme = dso__sym_priv(self, sym);
 801         pthread_mutex_init(&syme->source_lock, NULL);
 802         if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
 803                 sym_filter_entry = syme;
 804
 805         for (i = 0; skip_symbols[i]; i++) {
 806                 if (!strcmp(skip_symbols[i], name)) {
 807                         syme->skip = 1;
 808                         break;
 809                 }
 810         }
 811
 812         return 0;
 813 }
 814
 815 static int parse_symbols(void)
 816 {
 817         struct rb_node *node;
 818         struct symbol  *sym;
 819         int modules = vmlinux ? 1 : 0;
 820
 821         kernel_dso = dso__new("[kernel]", sizeof(struct sym_entry));
 822         if (kernel_dso == NULL)
 823                 return -1;
 824
 825         if (dso__load_kernel(kernel_dso, vmlinux, symbol_filter, verbose, modules) <= 0)
 826                 goto out_delete_dso;
 827
 828         node = rb_first(&kernel_dso->syms);
 829         sym = rb_entry(node, struct symbol, rb_node);
 830         min_ip = sym->start;
 831
 832         node = rb_last(&kernel_dso->syms);
 833         sym = rb_entry(node, struct symbol, rb_node);
 834         max_ip = sym->end;
 835
 836         if (dump_symtab)
 837                 dso__fprintf(kernel_dso, stderr);
 838
 839         return 0;
 840
 841 out_delete_dso:
 842         dso__delete(kernel_dso);
 843         kernel_dso = NULL;
 844         return -1;
 845 }
 846
 847 /*
 848  * Binary search in the histogram table and record the hit:
 849  */
 850 static void record_ip(u64 ip, int counter)
 851 {
 852         struct symbol *sym = dso__find_symbol(kernel_dso, ip);
 853
 854         if (sym != NULL) {
 855                 struct sym_entry *syme = dso__sym_priv(kernel_dso, sym);
 856
 857                 if (!syme->skip) {
 858                         syme->count[counter]++;
 859                         record_precise_ip(syme, counter, ip);
 860                         pthread_mutex_lock(&active_symbols_lock);
 861                         if (list_empty(&syme->node) || !syme->node.next)
 862                                 __list_insert_active_sym(syme);
 863                         pthread_mutex_unlock(&active_symbols_lock);
 864                         return;
 865                 }
 866         }
 867
 868         samples--;
 869 }
 870
 871 static void process_event(u64 ip, int counter, int user)
 872 {
 873         samples++;
 874
 875         if (user) {
 876                 userspace_samples++;
 877                 return;
 878         }
 879
 880         record_ip(ip, counter);
 881 }
 882
 883 struct mmap_data {
 884         int                     counter;
 885         void                    *base;
 886         int                     mask;
 887         unsigned int            prev;
 888 };
 889
 890 static unsigned int mmap_read_head(struct mmap_data *md)
 891 {
 892         struct perf_counter_mmap_page *pc = md->base;
 893         int head;
 894
 895         head = pc->data_head;
 896         rmb();
 897
 898         return head;
 899 }
 900
 901 struct timeval last_read, this_read;
 902
 903 static void mmap_read_counter(struct mmap_data *md)
 904 {
 905         unsigned int head = mmap_read_head(md);
 906         unsigned int old = md->prev;
 907         unsigned char *data = md->base + page_size;
 908         int diff;
 909
 910         gettimeofday(&this_read, NULL);
 911
 912         /*
 913          * If we're further behind than half the buffer, there's a chance
 914          * the writer will bite our tail and mess up the samples under us.
 915          *
 916          * If we somehow ended up ahead of the head, we got messed up.
 917          *
 918          * In either case, truncate and restart at head.
 919          */
 920         diff = head - old;
 921         if (diff > md->mask / 2 || diff < 0) {
 922                 struct timeval iv;
 923                 unsigned long msecs;
 924
 925                 timersub(&this_read, &last_read, &iv);
 926                 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
 927
 928                 fprintf(stderr, "WARNING: failed to keep up with mmap data."
 929                                 "  Last read %lu msecs ago.\n", msecs);
 930
 931                 /*
 932                  * head points to a known good entry, start there.
 933                  */
 934                 old = head;
 935         }
 936
 937         last_read = this_read;
 938
 939         for (; old != head;) {
 940                 struct ip_event {
 941                         struct perf_event_header header;
 942                         u64 ip;
 943                         u32 pid, target_pid;
 944                 };
 945                 struct mmap_event {
 946                         struct perf_event_header header;
 947                         u32 pid, target_pid;
 948                         u64 start;
 949                         u64 len;
 950                         u64 pgoff;
 951                         char filename[PATH_MAX];
 952                 };
 953
 954                 typedef union event_union {
 955                         struct perf_event_header header;
 956                         struct ip_event ip;
 957                         struct mmap_event mmap;
 958                 } event_t;
 959
 960                 event_t *event = (event_t *)&data[old & md->mask];
 961
 962                 event_t event_copy;
 963
 964                 size_t size = event->header.size;
 965
 966                 /*
 967                  * Event straddles the mmap boundary -- header should always
 968                  * be inside due to u64 alignment of output.
 969                  */
 970                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 971                         unsigned int offset = old;
 972                         unsigned int len = min(sizeof(*event), size), cpy;
 973                         void *dst = &event_copy;
 974
 975                         do {
 976                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 977                                 memcpy(dst, &data[offset & md->mask], cpy);
 978                                 offset += cpy;
 979                                 dst += cpy;
 980                                 len -= cpy;
 981                         } while (len);
 982
 983                         event = &event_copy;
 984                 }
 985
 986                 old += size;
 987
 988                 if (event->header.type == PERF_EVENT_SAMPLE) {
 989                         int user =
 990         (event->header.misc & PERF_EVENT_MISC_CPUMODE_MASK) == PERF_EVENT_MISC_USER;
 991                         process_event(event->ip.ip, md->counter, user);
 992                 }
 993         }
 994
 995         md->prev = old;
 996 }
 997
 998 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
 999 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
1000
1001 static void mmap_read(void)
1002 {
1003         int i, counter;
1004
1005         for (i = 0; i < nr_cpus; i++) {
1006                 for (counter = 0; counter < nr_counters; counter++)
1007                         mmap_read_counter(&mmap_array[i][counter]);
1008         }
1009 }
1010
1011 int nr_poll;
1012 int group_fd;
1013
1014 static void start_counter(int i, int counter)
1015 {
1016         struct perf_counter_attr *attr;
1017         int cpu;
1018
1019         cpu = profile_cpu;
1020         if (target_pid == -1 && profile_cpu == -1)
1021                 cpu = i;
1022
1023         attr = attrs + counter;
1024
1025         attr->sample_type       = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
1026         attr->freq              = freq;
1027         attr->inherit           = (cpu < 0) && inherit;
1028
1029 try_again:
1030         fd[i][counter] = sys_perf_counter_open(attr, target_pid, cpu, group_fd, 0);
1031
1032         if (fd[i][counter] < 0) {
1033                 int err = errno;
1034
1035                 if (err == EPERM)
1036                         die("No permission - are you root?\n");
1037                 /*
1038                  * If it's cycles then fall back to hrtimer
1039                  * based cpu-clock-tick sw counter, which
1040                  * is always available even if no PMU support:
1041                  */
1042                 if (attr->type == PERF_TYPE_HARDWARE
1043                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
1044
1045                         if (verbose)
1046                                 warning(" ... trying to fall back to cpu-clock-ticks\n");
1047
1048                         attr->type = PERF_TYPE_SOFTWARE;
1049                         attr->config = PERF_COUNT_SW_CPU_CLOCK;
1050                         goto try_again;
1051                 }
1052                 printf("\n");
1053                 error("perfcounter syscall returned with %d (%s)\n",
1054                         fd[i][counter], strerror(err));
1055                 die("No CONFIG_PERF_COUNTERS=y kernel support configured?\n");
1056                 exit(-1);
1057         }
1058         assert(fd[i][counter] >= 0);
1059         fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1060
1061         /*
1062          * First counter acts as the group leader:
1063          */
1064         if (group && group_fd == -1)
1065                 group_fd = fd[i][counter];
1066
1067         event_array[nr_poll].fd = fd[i][counter];
1068         event_array[nr_poll].events = POLLIN;
1069         nr_poll++;
1070
1071         mmap_array[i][counter].counter = counter;
1072         mmap_array[i][counter].prev = 0;
1073         mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1074         mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1075                         PROT_READ, MAP_SHARED, fd[i][counter], 0);
1076         if (mmap_array[i][counter].base == MAP_FAILED)
1077                 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1078 }
1079
1080 static int __cmd_top(void)
1081 {
1082         pthread_t thread;
1083         int i, counter;
1084         int ret;
1085
1086         for (i = 0; i < nr_cpus; i++) {
1087                 group_fd = -1;
1088                 for (counter = 0; counter < nr_counters; counter++)
1089                         start_counter(i, counter);
1090         }
1091
1092         /* Wait for a minimal set of events before starting the snapshot */
1093         poll(event_array, nr_poll, 100);
1094
1095         mmap_read();
1096
1097         if (pthread_create(&thread, NULL, display_thread, NULL)) {
1098                 printf("Could not create display thread.\n");
1099                 exit(-1);
1100         }
1101
1102         if (realtime_prio) {
1103                 struct sched_param param;
1104
1105                 param.sched_priority = realtime_prio;
1106                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1107                         printf("Could not set realtime priority.\n");
1108                         exit(-1);
1109                 }
1110         }
1111
1112         while (1) {
1113                 int hits = samples;
1114
1115                 mmap_read();
1116
1117                 if (hits == samples)
1118                         ret = poll(event_array, nr_poll, 100);
1119         }
1120
1121         return 0;
1122 }
1123
1124 static const char * const top_usage[] = {
1125         "perf top [<options>]",
1126         NULL
1127 };
1128
1129 static const struct option options[] = {
1130         OPT_CALLBACK('e', "event", NULL, "event",
1131                      "event selector. use 'perf list' to list available events",
1132                      parse_events),
1133         OPT_INTEGER('c', "count", &default_interval,
1134                     "event period to sample"),
1135         OPT_INTEGER('p', "pid", &target_pid,
1136                     "profile events on existing pid"),
1137         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1138                             "system-wide collection from all CPUs"),
1139         OPT_INTEGER('C', "CPU", &profile_cpu,
1140                     "CPU to profile on"),
1141         OPT_STRING('k', "vmlinux", &vmlinux, "file", "vmlinux pathname"),
1142         OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1143                     "number of mmap data pages"),
1144         OPT_INTEGER('r', "realtime", &realtime_prio,
1145                     "collect data with this RT SCHED_FIFO priority"),
1146         OPT_INTEGER('d', "delay", &delay_secs,
1147                     "number of seconds to delay between refreshes"),
1148         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1149                             "dump the symbol table used for profiling"),
1150         OPT_INTEGER('f', "count-filter", &count_filter,
1151                     "only display functions with more events than this"),
1152         OPT_BOOLEAN('g', "group", &group,
1153                             "put the counters into a counter group"),
1154         OPT_BOOLEAN('i', "inherit", &inherit,
1155                     "child tasks inherit counters"),
1156         OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1157                     "symbol to annotate - requires -k option"),
1158         OPT_BOOLEAN('z', "zero", &zero,
1159                     "zero history across updates"),
1160         OPT_INTEGER('F', "freq", &freq,
1161                     "profile at this frequency"),
1162         OPT_INTEGER('E', "entries", &print_entries,
1163                     "display this many functions"),
1164         OPT_BOOLEAN('v', "verbose", &verbose,
1165                     "be more verbose (show counter open errors, etc)"),
1166         OPT_END()
1167 };
1168
1169 int cmd_top(int argc, const char **argv, const char *prefix __used)
1170 {
1171         int counter;
1172
1173         symbol__init();
1174
1175         page_size = sysconf(_SC_PAGE_SIZE);
1176
1177         argc = parse_options(argc, argv, options, top_usage, 0);
1178         if (argc)
1179                 usage_with_options(top_usage, options);
1180
1181         if (freq) {
1182                 default_interval = freq;
1183                 freq = 1;
1184         }
1185
1186         /* CPU and PID are mutually exclusive */
1187         if (target_pid != -1 && profile_cpu != -1) {
1188                 printf("WARNING: PID switch overriding CPU\n");
1189                 sleep(1);
1190                 profile_cpu = -1;
1191         }
1192
1193         if (!nr_counters)
1194                 nr_counters = 1;
1195
1196         if (delay_secs < 1)
1197                 delay_secs = 1;
1198
1199         parse_symbols();
1200         parse_source(sym_filter_entry);
1201
1202         /*
1203          * Fill in the ones not specifically initialized via -c:
1204          */
1205         for (counter = 0; counter < nr_counters; counter++) {
1206                 if (attrs[counter].sample_period)
1207                         continue;
1208
1209                 attrs[counter].sample_period = default_interval;
1210         }
1211
1212         nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1213         assert(nr_cpus <= MAX_NR_CPUS);
1214         assert(nr_cpus >= 0);
1215
1216         if (target_pid != -1 || profile_cpu != -1)
1217                 nr_cpus = 1;
1218
1219         return __cmd_top();
1220 }