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