SAFE public projects git trees. - safe/jmp/linux-2.6/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                   =     15;
  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 /*
  80  * Source
  81  */
  82
  83 struct source_line {
  84         u64                     eip;
  85         unsigned long           count[MAX_COUNTERS];
  86         char                    *line;
  87         struct source_line      *next;
  88 };
  89
  90 static char                     *sym_filter                     =   NULL;
  91 struct sym_entry                *sym_filter_entry               =   NULL;
  92 static int                      sym_pcnt_filter                 =      5;
  93 static int                      sym_counter                     =      0;
  94 static int                      display_weighted                =     -1;
  95
  96 /*
  97  * Symbols
  98  */
  99
 100 struct sym_entry {
 101         struct rb_node          rb_node;
 102         struct list_head        node;
 103         unsigned long           count[MAX_COUNTERS];
 104         unsigned long           snap_count;
 105         double                  weight;
 106         int                     skip;
 107         struct map              *map;
 108         struct source_line      *source;
 109         struct source_line      *lines;
 110         struct source_line      **lines_tail;
 111         pthread_mutex_t         source_lock;
 112 };
 113
 114 /*
 115  * Source functions
 116  */
 117
 118 static void parse_source(struct sym_entry *syme)
 119 {
 120         struct symbol *sym;
 121         struct map *map;
 122         FILE *file;
 123         char command[PATH_MAX*2];
 124         const char *path;
 125         u64 len;
 126
 127         if (!syme)
 128                 return;
 129
 130         if (syme->lines) {
 131                 pthread_mutex_lock(&syme->source_lock);
 132                 goto out_assign;
 133         }
 134
 135         sym = (struct symbol *)(syme + 1);
 136         map = syme->map;
 137         path = map->dso->long_name;
 138
 139         len = sym->end - sym->start;
 140
 141         sprintf(command,
 142                 "objdump --start-address=0x%016Lx "
 143                          "--stop-address=0x%016Lx -dS %s",
 144                 map->unmap_ip(map, sym->start),
 145                 map->unmap_ip(map, sym->end), path);
 146
 147         file = popen(command, "r");
 148         if (!file)
 149                 return;
 150
 151         pthread_mutex_lock(&syme->source_lock);
 152         syme->lines_tail = &syme->lines;
 153         while (!feof(file)) {
 154                 struct source_line *src;
 155                 size_t dummy = 0;
 156                 char *c;
 157
 158                 src = malloc(sizeof(struct source_line));
 159                 assert(src != NULL);
 160                 memset(src, 0, sizeof(struct source_line));
 161
 162                 if (getline(&src->line, &dummy, file) < 0)
 163                         break;
 164                 if (!src->line)
 165                         break;
 166
 167                 c = strchr(src->line, '\n');
 168                 if (c)
 169                         *c = 0;
 170
 171                 src->next = NULL;
 172                 *syme->lines_tail = src;
 173                 syme->lines_tail = &src->next;
 174
 175                 if (strlen(src->line)>8 && src->line[8] == ':') {
 176                         src->eip = strtoull(src->line, NULL, 16);
 177                         src->eip = map->unmap_ip(map, src->eip);
 178                 }
 179                 if (strlen(src->line)>8 && src->line[16] == ':') {
 180                         src->eip = strtoull(src->line, NULL, 16);
 181                         src->eip = map->unmap_ip(map, src->eip);
 182                 }
 183         }
 184         pclose(file);
 185 out_assign:
 186         sym_filter_entry = syme;
 187         pthread_mutex_unlock(&syme->source_lock);
 188 }
 189
 190 static void __zero_source_counters(struct sym_entry *syme)
 191 {
 192         int i;
 193         struct source_line *line;
 194
 195         line = syme->lines;
 196         while (line) {
 197                 for (i = 0; i < nr_counters; i++)
 198                         line->count[i] = 0;
 199                 line = line->next;
 200         }
 201 }
 202
 203 static void record_precise_ip(struct sym_entry *syme, int counter, u64 ip)
 204 {
 205         struct source_line *line;
 206
 207         if (syme != sym_filter_entry)
 208                 return;
 209
 210         if (pthread_mutex_trylock(&syme->source_lock))
 211                 return;
 212
 213         if (!syme->source)
 214                 goto out_unlock;
 215
 216         for (line = syme->lines; line; line = line->next) {
 217                 if (line->eip == ip) {
 218                         line->count[counter]++;
 219                         break;
 220                 }
 221                 if (line->eip > ip)
 222                         break;
 223         }
 224 out_unlock:
 225         pthread_mutex_unlock(&syme->source_lock);
 226 }
 227
 228 static void lookup_sym_source(struct sym_entry *syme)
 229 {
 230         struct symbol *symbol = (struct symbol *)(syme + 1);
 231         struct source_line *line;
 232         char pattern[PATH_MAX];
 233
 234         sprintf(pattern, "<%s>:", symbol->name);
 235
 236         pthread_mutex_lock(&syme->source_lock);
 237         for (line = syme->lines; line; line = line->next) {
 238                 if (strstr(line->line, pattern)) {
 239                         syme->source = line;
 240                         break;
 241                 }
 242         }
 243         pthread_mutex_unlock(&syme->source_lock);
 244 }
 245
 246 static void show_lines(struct source_line *queue, int count, int total)
 247 {
 248         int i;
 249         struct source_line *line;
 250
 251         line = queue;
 252         for (i = 0; i < count; i++) {
 253                 float pcnt = 100.0*(float)line->count[sym_counter]/(float)total;
 254
 255                 printf("%8li %4.1f%%\t%s\n", line->count[sym_counter], pcnt, line->line);
 256                 line = line->next;
 257         }
 258 }
 259
 260 #define TRACE_COUNT     3
 261
 262 static void show_details(struct sym_entry *syme)
 263 {
 264         struct symbol *symbol;
 265         struct source_line *line;
 266         struct source_line *line_queue = NULL;
 267         int displayed = 0;
 268         int line_queue_count = 0, total = 0, more = 0;
 269
 270         if (!syme)
 271                 return;
 272
 273         if (!syme->source)
 274                 lookup_sym_source(syme);
 275
 276         if (!syme->source)
 277                 return;
 278
 279         symbol = (struct symbol *)(syme + 1);
 280         printf("Showing %s for %s\n", event_name(sym_counter), symbol->name);
 281         printf("  Events  Pcnt (>=%d%%)\n", sym_pcnt_filter);
 282
 283         pthread_mutex_lock(&syme->source_lock);
 284         line = syme->source;
 285         while (line) {
 286                 total += line->count[sym_counter];
 287                 line = line->next;
 288         }
 289
 290         line = syme->source;
 291         while (line) {
 292                 float pcnt = 0.0;
 293
 294                 if (!line_queue_count)
 295                         line_queue = line;
 296                 line_queue_count++;
 297
 298                 if (line->count[sym_counter])
 299                         pcnt = 100.0 * line->count[sym_counter] / (float)total;
 300                 if (pcnt >= (float)sym_pcnt_filter) {
 301                         if (displayed <= print_entries)
 302                                 show_lines(line_queue, line_queue_count, total);
 303                         else more++;
 304                         displayed += line_queue_count;
 305                         line_queue_count = 0;
 306                         line_queue = NULL;
 307                 } else if (line_queue_count > TRACE_COUNT) {
 308                         line_queue = line_queue->next;
 309                         line_queue_count--;
 310                 }
 311
 312                 line->count[sym_counter] = zero ? 0 : line->count[sym_counter] * 7 / 8;
 313                 line = line->next;
 314         }
 315         pthread_mutex_unlock(&syme->source_lock);
 316         if (more)
 317                 printf("%d lines not displayed, maybe increase display entries [e]\n", more);
 318 }
 319
 320 /*
 321  * Symbols will be added here in record_ip and will get out
 322  * after decayed.
 323  */
 324 static LIST_HEAD(active_symbols);
 325 static pthread_mutex_t active_symbols_lock = PTHREAD_MUTEX_INITIALIZER;
 326
 327 /*
 328  * Ordering weight: count-1 * count-2 * ... / count-n
 329  */
 330 static double sym_weight(const struct sym_entry *sym)
 331 {
 332         double weight = sym->snap_count;
 333         int counter;
 334
 335         if (!display_weighted)
 336                 return weight;
 337
 338         for (counter = 1; counter < nr_counters-1; counter++)
 339                 weight *= sym->count[counter];
 340
 341         weight /= (sym->count[counter] + 1);
 342
 343         return weight;
 344 }
 345
 346 static long                     samples;
 347 static long                     userspace_samples;
 348 static const char               CONSOLE_CLEAR[] = "\e[H\e[2J";
 349
 350 static void __list_insert_active_sym(struct sym_entry *syme)
 351 {
 352         list_add(&syme->node, &active_symbols);
 353 }
 354
 355 static void list_remove_active_sym(struct sym_entry *syme)
 356 {
 357         pthread_mutex_lock(&active_symbols_lock);
 358         list_del_init(&syme->node);
 359         pthread_mutex_unlock(&active_symbols_lock);
 360 }
 361
 362 static void rb_insert_active_sym(struct rb_root *tree, struct sym_entry *se)
 363 {
 364         struct rb_node **p = &tree->rb_node;
 365         struct rb_node *parent = NULL;
 366         struct sym_entry *iter;
 367
 368         while (*p != NULL) {
 369                 parent = *p;
 370                 iter = rb_entry(parent, struct sym_entry, rb_node);
 371
 372                 if (se->weight > iter->weight)
 373                         p = &(*p)->rb_left;
 374                 else
 375                         p = &(*p)->rb_right;
 376         }
 377
 378         rb_link_node(&se->rb_node, parent, p);
 379         rb_insert_color(&se->rb_node, tree);
 380 }
 381
 382 static void print_sym_table(void)
 383 {
 384         int printed = 0, j;
 385         int counter, snap = !display_weighted ? sym_counter : 0;
 386         float samples_per_sec = samples/delay_secs;
 387         float ksamples_per_sec = (samples-userspace_samples)/delay_secs;
 388         float sum_ksamples = 0.0;
 389         struct sym_entry *syme, *n;
 390         struct rb_root tmp = RB_ROOT;
 391         struct rb_node *nd;
 392
 393         samples = userspace_samples = 0;
 394
 395         /* Sort the active symbols */
 396         pthread_mutex_lock(&active_symbols_lock);
 397         syme = list_entry(active_symbols.next, struct sym_entry, node);
 398         pthread_mutex_unlock(&active_symbols_lock);
 399
 400         list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
 401                 syme->snap_count = syme->count[snap];
 402                 if (syme->snap_count != 0) {
 403                         syme->weight = sym_weight(syme);
 404                         rb_insert_active_sym(&tmp, syme);
 405                         sum_ksamples += syme->snap_count;
 406
 407                         for (j = 0; j < nr_counters; j++)
 408                                 syme->count[j] = zero ? 0 : syme->count[j] * 7 / 8;
 409                 } else
 410                         list_remove_active_sym(syme);
 411         }
 412
 413         puts(CONSOLE_CLEAR);
 414
 415         printf(
 416 "------------------------------------------------------------------------------\n");
 417         printf( "   PerfTop:%8.0f irqs/sec  kernel:%4.1f%% [",
 418                 samples_per_sec,
 419                 100.0 - (100.0*((samples_per_sec-ksamples_per_sec)/samples_per_sec)));
 420
 421         if (nr_counters == 1 || !display_weighted) {
 422                 printf("%Ld", (u64)attrs[0].sample_period);
 423                 if (freq)
 424                         printf("Hz ");
 425                 else
 426                         printf(" ");
 427         }
 428
 429         if (!display_weighted)
 430                 printf("%s", event_name(sym_counter));
 431         else for (counter = 0; counter < nr_counters; counter++) {
 432                 if (counter)
 433                         printf("/");
 434
 435                 printf("%s", event_name(counter));
 436         }
 437
 438         printf( "], ");
 439
 440         if (target_pid != -1)
 441                 printf(" (target_pid: %d", target_pid);
 442         else
 443                 printf(" (all");
 444
 445         if (profile_cpu != -1)
 446                 printf(", cpu: %d)\n", profile_cpu);
 447         else {
 448                 if (target_pid != -1)
 449                         printf(")\n");
 450                 else
 451                         printf(", %d CPUs)\n", nr_cpus);
 452         }
 453
 454         printf("------------------------------------------------------------------------------\n\n");
 455
 456         if (sym_filter_entry) {
 457                 show_details(sym_filter_entry);
 458                 return;
 459         }
 460
 461         if (nr_counters == 1)
 462                 printf("             samples    pcnt");
 463         else
 464                 printf("   weight    samples    pcnt");
 465
 466         if (verbose)
 467                 printf("         RIP       ");
 468         printf("   kernel function\n");
 469         printf("   %s    _______   _____",
 470                nr_counters == 1 ? "      " : "______");
 471         if (verbose)
 472                 printf("   ________________");
 473         printf("   _______________\n\n");
 474
 475         for (nd = rb_first(&tmp); nd; nd = rb_next(nd)) {
 476                 struct symbol *sym;
 477                 double pcnt;
 478
 479                 syme = rb_entry(nd, struct sym_entry, rb_node);
 480                 sym = (struct symbol *)(syme + 1);
 481
 482                 if (++printed > print_entries || (int)syme->snap_count < count_filter)
 483                         continue;
 484
 485                 pcnt = 100.0 - (100.0 * ((sum_ksamples - syme->snap_count) /
 486                                          sum_ksamples));
 487
 488                 if (nr_counters == 1 || !display_weighted)
 489                         printf("%20.2f - ", syme->weight);
 490                 else
 491                         printf("%9.1f %10ld - ", syme->weight, syme->snap_count);
 492
 493                 percent_color_fprintf(stdout, "%4.1f%%", pcnt);
 494                 if (verbose)
 495                         printf(" - %016llx", sym->start);
 496                 printf(" : %s", sym->name);
 497                 if (syme->map->dso->name[0] == '[')
 498                         printf(" \t%s", syme->map->dso->name);
 499                 printf("\n");
 500         }
 501 }
 502
 503 static void prompt_integer(int *target, const char *msg)
 504 {
 505         char *buf = malloc(0), *p;
 506         size_t dummy = 0;
 507         int tmp;
 508
 509         fprintf(stdout, "\n%s: ", msg);
 510         if (getline(&buf, &dummy, stdin) < 0)
 511                 return;
 512
 513         p = strchr(buf, '\n');
 514         if (p)
 515                 *p = 0;
 516
 517         p = buf;
 518         while(*p) {
 519                 if (!isdigit(*p))
 520                         goto out_free;
 521                 p++;
 522         }
 523         tmp = strtoul(buf, NULL, 10);
 524         *target = tmp;
 525 out_free:
 526         free(buf);
 527 }
 528
 529 static void prompt_percent(int *target, const char *msg)
 530 {
 531         int tmp = 0;
 532
 533         prompt_integer(&tmp, msg);
 534         if (tmp >= 0 && tmp <= 100)
 535                 *target = tmp;
 536 }
 537
 538 static void prompt_symbol(struct sym_entry **target, const char *msg)
 539 {
 540         char *buf = malloc(0), *p;
 541         struct sym_entry *syme = *target, *n, *found = NULL;
 542         size_t dummy = 0;
 543
 544         /* zero counters of active symbol */
 545         if (syme) {
 546                 pthread_mutex_lock(&syme->source_lock);
 547                 __zero_source_counters(syme);
 548                 *target = NULL;
 549                 pthread_mutex_unlock(&syme->source_lock);
 550         }
 551
 552         fprintf(stdout, "\n%s: ", msg);
 553         if (getline(&buf, &dummy, stdin) < 0)
 554                 goto out_free;
 555
 556         p = strchr(buf, '\n');
 557         if (p)
 558                 *p = 0;
 559
 560         pthread_mutex_lock(&active_symbols_lock);
 561         syme = list_entry(active_symbols.next, struct sym_entry, node);
 562         pthread_mutex_unlock(&active_symbols_lock);
 563
 564         list_for_each_entry_safe_from(syme, n, &active_symbols, node) {
 565                 struct symbol *sym = (struct symbol *)(syme + 1);
 566
 567                 if (!strcmp(buf, sym->name)) {
 568                         found = syme;
 569                         break;
 570                 }
 571         }
 572
 573         if (!found) {
 574                 fprintf(stderr, "Sorry, %s is not active.\n", sym_filter);
 575                 sleep(1);
 576                 return;
 577         } else
 578                 parse_source(found);
 579
 580 out_free:
 581         free(buf);
 582 }
 583
 584 static void print_mapped_keys(void)
 585 {
 586         char *name = NULL;
 587
 588         if (sym_filter_entry) {
 589                 struct symbol *sym = (struct symbol *)(sym_filter_entry+1);
 590                 name = sym->name;
 591         }
 592
 593         fprintf(stdout, "\nMapped keys:\n");
 594         fprintf(stdout, "\t[d]     display refresh delay.             \t(%d)\n", delay_secs);
 595         fprintf(stdout, "\t[e]     display entries (lines).           \t(%d)\n", print_entries);
 596
 597         if (nr_counters > 1)
 598                 fprintf(stdout, "\t[E]     active event counter.              \t(%s)\n", event_name(sym_counter));
 599
 600         fprintf(stdout, "\t[f]     profile display filter (count).    \t(%d)\n", count_filter);
 601
 602         if (vmlinux_name) {
 603                 fprintf(stdout, "\t[F]     annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
 604                 fprintf(stdout, "\t[s]     annotate symbol.                   \t(%s)\n", name?: "NULL");
 605                 fprintf(stdout, "\t[S]     stop annotation.\n");
 606         }
 607
 608         if (nr_counters > 1)
 609                 fprintf(stdout, "\t[w]     toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
 610
 611         fprintf(stdout, "\t[z]     toggle sample zeroing.             \t(%d)\n", zero ? 1 : 0);
 612         fprintf(stdout, "\t[qQ]    quit.\n");
 613 }
 614
 615 static int key_mapped(int c)
 616 {
 617         switch (c) {
 618                 case 'd':
 619                 case 'e':
 620                 case 'f':
 621                 case 'z':
 622                 case 'q':
 623                 case 'Q':
 624                         return 1;
 625                 case 'E':
 626                 case 'w':
 627                         return nr_counters > 1 ? 1 : 0;
 628                 case 'F':
 629                 case 's':
 630                 case 'S':
 631                         return vmlinux_name ? 1 : 0;
 632                 default:
 633                         break;
 634         }
 635
 636         return 0;
 637 }
 638
 639 static void handle_keypress(int c)
 640 {
 641         if (!key_mapped(c)) {
 642                 struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 643                 struct termios tc, save;
 644
 645                 print_mapped_keys();
 646                 fprintf(stdout, "\nEnter selection, or unmapped key to continue: ");
 647                 fflush(stdout);
 648
 649                 tcgetattr(0, &save);
 650                 tc = save;
 651                 tc.c_lflag &= ~(ICANON | ECHO);
 652                 tc.c_cc[VMIN] = 0;
 653                 tc.c_cc[VTIME] = 0;
 654                 tcsetattr(0, TCSANOW, &tc);
 655
 656                 poll(&stdin_poll, 1, -1);
 657                 c = getc(stdin);
 658
 659                 tcsetattr(0, TCSAFLUSH, &save);
 660                 if (!key_mapped(c))
 661                         return;
 662         }
 663
 664         switch (c) {
 665                 case 'd':
 666                         prompt_integer(&delay_secs, "Enter display delay");
 667                         if (delay_secs < 1)
 668                                 delay_secs = 1;
 669                         break;
 670                 case 'e':
 671                         prompt_integer(&print_entries, "Enter display entries (lines)");
 672                         break;
 673                 case 'E':
 674                         if (nr_counters > 1) {
 675                                 int i;
 676
 677                                 fprintf(stderr, "\nAvailable events:");
 678                                 for (i = 0; i < nr_counters; i++)
 679                                         fprintf(stderr, "\n\t%d %s", i, event_name(i));
 680
 681                                 prompt_integer(&sym_counter, "Enter details event counter");
 682
 683                                 if (sym_counter >= nr_counters) {
 684                                         fprintf(stderr, "Sorry, no such event, using %s.\n", event_name(0));
 685                                         sym_counter = 0;
 686                                         sleep(1);
 687                                 }
 688                         } else sym_counter = 0;
 689                         break;
 690                 case 'f':
 691                         prompt_integer(&count_filter, "Enter display event count filter");
 692                         break;
 693                 case 'F':
 694                         prompt_percent(&sym_pcnt_filter, "Enter details display event filter (percent)");
 695                         break;
 696                 case 'q':
 697                 case 'Q':
 698                         printf("exiting.\n");
 699                         exit(0);
 700                 case 's':
 701                         prompt_symbol(&sym_filter_entry, "Enter details symbol");
 702                         break;
 703                 case 'S':
 704                         if (!sym_filter_entry)
 705                                 break;
 706                         else {
 707                                 struct sym_entry *syme = sym_filter_entry;
 708
 709                                 pthread_mutex_lock(&syme->source_lock);
 710                                 sym_filter_entry = NULL;
 711                                 __zero_source_counters(syme);
 712                                 pthread_mutex_unlock(&syme->source_lock);
 713                         }
 714                         break;
 715                 case 'w':
 716                         display_weighted = ~display_weighted;
 717                         break;
 718                 case 'z':
 719                         zero = ~zero;
 720                         break;
 721                 default:
 722                         break;
 723         }
 724 }
 725
 726 static void *display_thread(void *arg __used)
 727 {
 728         struct pollfd stdin_poll = { .fd = 0, .events = POLLIN };
 729         struct termios tc, save;
 730         int delay_msecs, c;
 731
 732         tcgetattr(0, &save);
 733         tc = save;
 734         tc.c_lflag &= ~(ICANON | ECHO);
 735         tc.c_cc[VMIN] = 0;
 736         tc.c_cc[VTIME] = 0;
 737
 738 repeat:
 739         delay_msecs = delay_secs * 1000;
 740         tcsetattr(0, TCSANOW, &tc);
 741         /* trash return*/
 742         getc(stdin);
 743
 744         do {
 745                 print_sym_table();
 746         } while (!poll(&stdin_poll, 1, delay_msecs) == 1);
 747
 748         c = getc(stdin);
 749         tcsetattr(0, TCSAFLUSH, &save);
 750
 751         handle_keypress(c);
 752         goto repeat;
 753
 754         return NULL;
 755 }
 756
 757 /* Tag samples to be skipped. */
 758 static const char *skip_symbols[] = {
 759         "default_idle",
 760         "cpu_idle",
 761         "enter_idle",
 762         "exit_idle",
 763         "mwait_idle",
 764         "mwait_idle_with_hints",
 765         "poll_idle",
 766         "ppc64_runlatch_off",
 767         "pseries_dedicated_idle_sleep",
 768         NULL
 769 };
 770
 771 static int symbol_filter(struct map *map, struct symbol *sym)
 772 {
 773         struct sym_entry *syme;
 774         const char *name = sym->name;
 775         int i;
 776
 777         /*
 778          * ppc64 uses function descriptors and appends a '.' to the
 779          * start of every instruction address. Remove it.
 780          */
 781         if (name[0] == '.')
 782                 name++;
 783
 784         if (!strcmp(name, "_text") ||
 785             !strcmp(name, "_etext") ||
 786             !strcmp(name, "_sinittext") ||
 787             !strncmp("init_module", name, 11) ||
 788             !strncmp("cleanup_module", name, 14) ||
 789             strstr(name, "_text_start") ||
 790             strstr(name, "_text_end"))
 791                 return 1;
 792
 793         syme = dso__sym_priv(map->dso, sym);
 794         syme->map = map;
 795         pthread_mutex_init(&syme->source_lock, NULL);
 796         if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
 797                 sym_filter_entry = syme;
 798
 799         for (i = 0; skip_symbols[i]; i++) {
 800                 if (!strcmp(skip_symbols[i], name)) {
 801                         syme->skip = 1;
 802                         break;
 803                 }
 804         }
 805
 806         return 0;
 807 }
 808
 809 static int parse_symbols(void)
 810 {
 811         if (dsos__load_kernel(vmlinux_name, sizeof(struct sym_entry),
 812                               symbol_filter, 1) <= 0)
 813                 return -1;
 814
 815         if (dump_symtab)
 816                 dsos__fprintf(stderr);
 817
 818         return 0;
 819 }
 820
 821 /*
 822  * Binary search in the histogram table and record the hit:
 823  */
 824 static void record_ip(u64 ip, int counter)
 825 {
 826         struct map *map;
 827         struct symbol *sym = kernel_maps__find_symbol(ip, &map);
 828
 829         if (sym != NULL) {
 830                 struct sym_entry *syme = dso__sym_priv(map->dso, sym);
 831
 832                 if (!syme->skip) {
 833                         syme->count[counter]++;
 834                         record_precise_ip(syme, counter, ip);
 835                         pthread_mutex_lock(&active_symbols_lock);
 836                         if (list_empty(&syme->node) || !syme->node.next)
 837                                 __list_insert_active_sym(syme);
 838                         pthread_mutex_unlock(&active_symbols_lock);
 839                         return;
 840                 }
 841         }
 842
 843         samples--;
 844 }
 845
 846 static void process_event(u64 ip, int counter, int user)
 847 {
 848         samples++;
 849
 850         if (user) {
 851                 userspace_samples++;
 852                 return;
 853         }
 854
 855         record_ip(ip, counter);
 856 }
 857
 858 struct mmap_data {
 859         int                     counter;
 860         void                    *base;
 861         int                     mask;
 862         unsigned int            prev;
 863 };
 864
 865 static unsigned int mmap_read_head(struct mmap_data *md)
 866 {
 867         struct perf_event_mmap_page *pc = md->base;
 868         int head;
 869
 870         head = pc->data_head;
 871         rmb();
 872
 873         return head;
 874 }
 875
 876 static void mmap_read_counter(struct mmap_data *md)
 877 {
 878         unsigned int head = mmap_read_head(md);
 879         unsigned int old = md->prev;
 880         unsigned char *data = md->base + page_size;
 881         int diff;
 882
 883         /*
 884          * If we're further behind than half the buffer, there's a chance
 885          * the writer will bite our tail and mess up the samples under us.
 886          *
 887          * If we somehow ended up ahead of the head, we got messed up.
 888          *
 889          * In either case, truncate and restart at head.
 890          */
 891         diff = head - old;
 892         if (diff > md->mask / 2 || diff < 0) {
 893                 fprintf(stderr, "WARNING: failed to keep up with mmap data.\n");
 894
 895                 /*
 896                  * head points to a known good entry, start there.
 897                  */
 898                 old = head;
 899         }
 900
 901         for (; old != head;) {
 902                 event_t *event = (event_t *)&data[old & md->mask];
 903
 904                 event_t event_copy;
 905
 906                 size_t size = event->header.size;
 907
 908                 /*
 909                  * Event straddles the mmap boundary -- header should always
 910                  * be inside due to u64 alignment of output.
 911                  */
 912                 if ((old & md->mask) + size != ((old + size) & md->mask)) {
 913                         unsigned int offset = old;
 914                         unsigned int len = min(sizeof(*event), size), cpy;
 915                         void *dst = &event_copy;
 916
 917                         do {
 918                                 cpy = min(md->mask + 1 - (offset & md->mask), len);
 919                                 memcpy(dst, &data[offset & md->mask], cpy);
 920                                 offset += cpy;
 921                                 dst += cpy;
 922                                 len -= cpy;
 923                         } while (len);
 924
 925                         event = &event_copy;
 926                 }
 927
 928                 old += size;
 929
 930                 if (event->header.type == PERF_RECORD_SAMPLE) {
 931                         int user =
 932         (event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK) == PERF_RECORD_MISC_USER;
 933                         process_event(event->ip.ip, md->counter, user);
 934                 }
 935         }
 936
 937         md->prev = old;
 938 }
 939
 940 static struct pollfd event_array[MAX_NR_CPUS * MAX_COUNTERS];
 941 static struct mmap_data mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
 942
 943 static void mmap_read(void)
 944 {
 945         int i, counter;
 946
 947         for (i = 0; i < nr_cpus; i++) {
 948                 for (counter = 0; counter < nr_counters; counter++)
 949                         mmap_read_counter(&mmap_array[i][counter]);
 950         }
 951 }
 952
 953 int nr_poll;
 954 int group_fd;
 955
 956 static void start_counter(int i, int counter)
 957 {
 958         struct perf_event_attr *attr;
 959         int cpu;
 960
 961         cpu = profile_cpu;
 962         if (target_pid == -1 && profile_cpu == -1)
 963                 cpu = i;
 964
 965         attr = attrs + counter;
 966
 967         attr->sample_type       = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
 968
 969         if (freq) {
 970                 attr->sample_type       |= PERF_SAMPLE_PERIOD;
 971                 attr->freq              = 1;
 972                 attr->sample_freq       = freq;
 973         }
 974
 975         attr->inherit           = (cpu < 0) && inherit;
 976
 977 try_again:
 978         fd[i][counter] = sys_perf_event_open(attr, target_pid, cpu, group_fd, 0);
 979
 980         if (fd[i][counter] < 0) {
 981                 int err = errno;
 982
 983                 if (err == EPERM)
 984                         die("No permission - are you root?\n");
 985                 /*
 986                  * If it's cycles then fall back to hrtimer
 987                  * based cpu-clock-tick sw counter, which
 988                  * is always available even if no PMU support:
 989                  */
 990                 if (attr->type == PERF_TYPE_HARDWARE
 991                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
 992
 993                         if (verbose)
 994                                 warning(" ... trying to fall back to cpu-clock-ticks\n");
 995
 996                         attr->type = PERF_TYPE_SOFTWARE;
 997                         attr->config = PERF_COUNT_SW_CPU_CLOCK;
 998                         goto try_again;
 999                 }
1000                 printf("\n");
1001                 error("perfcounter syscall returned with %d (%s)\n",
1002                         fd[i][counter], strerror(err));
1003                 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
1004                 exit(-1);
1005         }
1006         assert(fd[i][counter] >= 0);
1007         fcntl(fd[i][counter], F_SETFL, O_NONBLOCK);
1008
1009         /*
1010          * First counter acts as the group leader:
1011          */
1012         if (group && group_fd == -1)
1013                 group_fd = fd[i][counter];
1014
1015         event_array[nr_poll].fd = fd[i][counter];
1016         event_array[nr_poll].events = POLLIN;
1017         nr_poll++;
1018
1019         mmap_array[i][counter].counter = counter;
1020         mmap_array[i][counter].prev = 0;
1021         mmap_array[i][counter].mask = mmap_pages*page_size - 1;
1022         mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
1023                         PROT_READ, MAP_SHARED, fd[i][counter], 0);
1024         if (mmap_array[i][counter].base == MAP_FAILED)
1025                 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
1026 }
1027
1028 static int __cmd_top(void)
1029 {
1030         pthread_t thread;
1031         int i, counter;
1032         int ret;
1033
1034         for (i = 0; i < nr_cpus; i++) {
1035                 group_fd = -1;
1036                 for (counter = 0; counter < nr_counters; counter++)
1037                         start_counter(i, counter);
1038         }
1039
1040         /* Wait for a minimal set of events before starting the snapshot */
1041         poll(event_array, nr_poll, 100);
1042
1043         mmap_read();
1044
1045         if (pthread_create(&thread, NULL, display_thread, NULL)) {
1046                 printf("Could not create display thread.\n");
1047                 exit(-1);
1048         }
1049
1050         if (realtime_prio) {
1051                 struct sched_param param;
1052
1053                 param.sched_priority = realtime_prio;
1054                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
1055                         printf("Could not set realtime priority.\n");
1056                         exit(-1);
1057                 }
1058         }
1059
1060         while (1) {
1061                 int hits = samples;
1062
1063                 mmap_read();
1064
1065                 if (hits == samples)
1066                         ret = poll(event_array, nr_poll, 100);
1067         }
1068
1069         return 0;
1070 }
1071
1072 static const char * const top_usage[] = {
1073         "perf top [<options>]",
1074         NULL
1075 };
1076
1077 static const struct option options[] = {
1078         OPT_CALLBACK('e', "event", NULL, "event",
1079                      "event selector. use 'perf list' to list available events",
1080                      parse_events),
1081         OPT_INTEGER('c', "count", &default_interval,
1082                     "event period to sample"),
1083         OPT_INTEGER('p', "pid", &target_pid,
1084                     "profile events on existing pid"),
1085         OPT_BOOLEAN('a', "all-cpus", &system_wide,
1086                             "system-wide collection from all CPUs"),
1087         OPT_INTEGER('C', "CPU", &profile_cpu,
1088                     "CPU to profile on"),
1089         OPT_STRING('k', "vmlinux", &vmlinux_name, "file", "vmlinux pathname"),
1090         OPT_INTEGER('m', "mmap-pages", &mmap_pages,
1091                     "number of mmap data pages"),
1092         OPT_INTEGER('r', "realtime", &realtime_prio,
1093                     "collect data with this RT SCHED_FIFO priority"),
1094         OPT_INTEGER('d', "delay", &delay_secs,
1095                     "number of seconds to delay between refreshes"),
1096         OPT_BOOLEAN('D', "dump-symtab", &dump_symtab,
1097                             "dump the symbol table used for profiling"),
1098         OPT_INTEGER('f', "count-filter", &count_filter,
1099                     "only display functions with more events than this"),
1100         OPT_BOOLEAN('g', "group", &group,
1101                             "put the counters into a counter group"),
1102         OPT_BOOLEAN('i', "inherit", &inherit,
1103                     "child tasks inherit counters"),
1104         OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
1105                     "symbol to annotate - requires -k option"),
1106         OPT_BOOLEAN('z', "zero", &zero,
1107                     "zero history across updates"),
1108         OPT_INTEGER('F', "freq", &freq,
1109                     "profile at this frequency"),
1110         OPT_INTEGER('E', "entries", &print_entries,
1111                     "display this many functions"),
1112         OPT_BOOLEAN('v', "verbose", &verbose,
1113                     "be more verbose (show counter open errors, etc)"),
1114         OPT_END()
1115 };
1116
1117 int cmd_top(int argc, const char **argv, const char *prefix __used)
1118 {
1119         int counter;
1120
1121         symbol__init();
1122
1123         page_size = sysconf(_SC_PAGE_SIZE);
1124
1125         argc = parse_options(argc, argv, options, top_usage, 0);
1126         if (argc)
1127                 usage_with_options(top_usage, options);
1128
1129         /* CPU and PID are mutually exclusive */
1130         if (target_pid != -1 && profile_cpu != -1) {
1131                 printf("WARNING: PID switch overriding CPU\n");
1132                 sleep(1);
1133                 profile_cpu = -1;
1134         }
1135
1136         if (!nr_counters)
1137                 nr_counters = 1;
1138
1139         if (delay_secs < 1)
1140                 delay_secs = 1;
1141
1142         parse_symbols();
1143         parse_source(sym_filter_entry);
1144
1145
1146         /*
1147          * User specified count overrides default frequency.
1148          */
1149         if (default_interval)
1150                 freq = 0;
1151         else if (freq) {
1152                 default_interval = freq;
1153         } else {
1154                 fprintf(stderr, "frequency and count are zero, aborting\n");
1155                 exit(EXIT_FAILURE);
1156         }
1157
1158         /*
1159          * Fill in the ones not specifically initialized via -c:
1160          */
1161         for (counter = 0; counter < nr_counters; counter++) {
1162                 if (attrs[counter].sample_period)
1163                         continue;
1164
1165                 attrs[counter].sample_period = default_interval;
1166         }
1167
1168         nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1169         assert(nr_cpus <= MAX_NR_CPUS);
1170         assert(nr_cpus >= 0);
1171
1172         if (target_pid != -1 || profile_cpu != -1)
1173                 nr_cpus = 1;
1174
1175         return __cmd_top();
1176 }