Documentation/perf_counter/builtin-report.c

   1 #include "util/util.h"
   2
   3 #include <libelf.h>
   4 #include <gelf.h>
   5 #include <elf.h>
   6
   7 #include "util/list.h"
   8 #include "util/rbtree.h"
   9
  10 #include "perf.h"
  11
  12 #include "util/parse-options.h"
  13 #include "util/parse-events.h"
  14
  15 #define SHOW_KERNEL     1
  16 #define SHOW_USER       2
  17 #define SHOW_HV         4
  18
  19 static char             const *input_name = "output.perf";
  20 static int              input;
  21 static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
  22
  23 static int              dump_trace = 0;
  24
  25 static unsigned long    page_size;
  26 static unsigned long    mmap_window = 32;
  27
  28 const char *perf_event_names[] = {
  29         [PERF_EVENT_MMAP]   = " PERF_EVENT_MMAP",
  30         [PERF_EVENT_MUNMAP] = " PERF_EVENT_MUNMAP",
  31         [PERF_EVENT_COMM]   = " PERF_EVENT_COMM",
  32 };
  33
  34 struct ip_event {
  35         struct perf_event_header header;
  36         __u64 ip;
  37         __u32 pid, tid;
  38 };
  39 struct mmap_event {
  40         struct perf_event_header header;
  41         __u32 pid, tid;
  42         __u64 start;
  43         __u64 len;
  44         __u64 pgoff;
  45         char filename[PATH_MAX];
  46 };
  47 struct comm_event {
  48         struct perf_event_header header;
  49         __u32 pid,tid;
  50         char comm[16];
  51 };
  52
  53 typedef union event_union {
  54         struct perf_event_header header;
  55         struct ip_event ip;
  56         struct mmap_event mmap;
  57         struct comm_event comm;
  58 } event_t;
  59
  60 struct symbol {
  61         struct rb_node rb_node;
  62         uint64_t       start;
  63         uint64_t       end;
  64         char           name[0];
  65 };
  66
  67 static struct symbol *symbol__new(uint64_t start, uint64_t len, const char *name)
  68 {
  69         struct symbol *self = malloc(sizeof(*self) + strlen(name) + 1);
  70
  71         if (self != NULL) {
  72                 self->start = start;
  73                 self->end   = start + len;
  74                 strcpy(self->name, name);
  75         }
  76
  77         return self;
  78 }
  79
  80 static void symbol__delete(struct symbol *self)
  81 {
  82         free(self);
  83 }
  84
  85 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
  86 {
  87         return fprintf(fp, " %lx-%lx %s\n",
  88                        self->start, self->end, self->name);
  89 }
  90
  91 struct dso {
  92         struct list_head node;
  93         struct rb_root   syms;
  94         char             name[0];
  95 };
  96
  97 static struct dso *dso__new(const char *name)
  98 {
  99         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 100
 101         if (self != NULL) {
 102                 strcpy(self->name, name);
 103                 self->syms = RB_ROOT;
 104         }
 105
 106         return self;
 107 }
 108
 109 static void dso__delete_symbols(struct dso *self)
 110 {
 111         struct symbol *pos;
 112         struct rb_node *next = rb_first(&self->syms);
 113
 114         while (next) {
 115                 pos = rb_entry(next, struct symbol, rb_node);
 116                 next = rb_next(&pos->rb_node);
 117                 symbol__delete(pos);
 118         }
 119 }
 120
 121 static void dso__delete(struct dso *self)
 122 {
 123         dso__delete_symbols(self);
 124         free(self);
 125 }
 126
 127 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
 128 {
 129         struct rb_node **p = &self->syms.rb_node;
 130         struct rb_node *parent = NULL;
 131         const uint64_t ip = sym->start;
 132         struct symbol *s;
 133
 134         while (*p != NULL) {
 135                 parent = *p;
 136                 s = rb_entry(parent, struct symbol, rb_node);
 137                 if (ip < s->start)
 138                         p = &(*p)->rb_left;
 139                 else
 140                         p = &(*p)->rb_right;
 141         }
 142         rb_link_node(&sym->rb_node, parent, p);
 143         rb_insert_color(&sym->rb_node, &self->syms);
 144 }
 145
 146 static struct symbol *dso__find_symbol(struct dso *self, uint64_t ip)
 147 {
 148         if (self == NULL)
 149                 return NULL;
 150
 151         struct rb_node *n = self->syms.rb_node;
 152
 153         while (n) {
 154                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 155
 156                 if (ip < s->start)
 157                         n = n->rb_left;
 158                 else if (ip > s->end)
 159                         n = n->rb_right;
 160                 else
 161                         return s;
 162         }
 163
 164         return NULL;
 165 }
 166
 167 /**
 168  * elf_symtab__for_each_symbol - iterate thru all the symbols
 169  *
 170  * @self: struct elf_symtab instance to iterate
 171  * @index: uint32_t index
 172  * @sym: GElf_Sym iterator
 173  */
 174 #define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
 175         for (index = 0, gelf_getsym(syms, index, &sym);\
 176              index < nr_syms; \
 177              index++, gelf_getsym(syms, index, &sym))
 178
 179 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 180 {
 181         return GELF_ST_TYPE(sym->st_info);
 182 }
 183
 184 static inline int elf_sym__is_function(const GElf_Sym *sym)
 185 {
 186         return elf_sym__type(sym) == STT_FUNC &&
 187                sym->st_name != 0 &&
 188                sym->st_shndx != SHN_UNDEF;
 189 }
 190
 191 static inline const char *elf_sym__name(const GElf_Sym *sym,
 192                                         const Elf_Data *symstrs)
 193 {
 194         return symstrs->d_buf + sym->st_name;
 195 }
 196
 197 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 198                                     GElf_Shdr *shp, const char *name,
 199                                     size_t *index)
 200 {
 201         Elf_Scn *sec = NULL;
 202         size_t cnt = 1;
 203
 204         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 205                 char *str;
 206
 207                 gelf_getshdr(sec, shp);
 208                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 209                 if (!strcmp(name, str)) {
 210                         if (index)
 211                                 *index = cnt;
 212                         break;
 213                 }
 214                 ++cnt;
 215         }
 216
 217         return sec;
 218 }
 219
 220 static int dso__load(struct dso *self)
 221 {
 222         int fd = open(self->name, O_RDONLY), err = -1;
 223
 224         if (fd == -1)
 225                 return -1;
 226
 227         Elf *elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 228         if (elf == NULL) {
 229                 fprintf(stderr, "%s: cannot read %s ELF file.\n",
 230                         __func__, self->name);
 231                 goto out_close;
 232         }
 233
 234         GElf_Ehdr ehdr;
 235         if (gelf_getehdr(elf, &ehdr) == NULL) {
 236                 fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 237                 goto out_elf_end;
 238         }
 239
 240         GElf_Shdr shdr;
 241         Elf_Scn *sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 242         if (sec == NULL)
 243                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 244
 245         if (sec == NULL)
 246                 goto out_elf_end;
 247
 248         Elf_Data *syms = elf_getdata(sec, NULL);
 249         if (syms == NULL)
 250                 goto out_elf_end;
 251
 252         sec = elf_getscn(elf, shdr.sh_link);
 253         if (sec == NULL)
 254                 goto out_elf_end;
 255
 256         Elf_Data *symstrs = elf_getdata(sec, NULL);
 257         if (symstrs == NULL)
 258                 goto out_elf_end;
 259
 260         const uint32_t nr_syms = shdr.sh_size / shdr.sh_entsize;
 261
 262         GElf_Sym sym;
 263         uint32_t index;
 264         elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
 265                 struct symbol *f;
 266
 267                 if (!elf_sym__is_function(&sym))
 268                         continue;
 269
 270                 sec = elf_getscn(elf, sym.st_shndx);
 271                 if (!sec)
 272                         goto out_elf_end;
 273
 274                 gelf_getshdr(sec, &shdr);
 275                 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 276
 277                 f = symbol__new(sym.st_value, sym.st_size,
 278                                 elf_sym__name(&sym, symstrs));
 279                 if (!f)
 280                         goto out_elf_end;
 281
 282                 dso__insert_symbol(self, f);
 283         }
 284
 285         err = 0;
 286 out_elf_end:
 287         elf_end(elf);
 288 out_close:
 289         close(fd);
 290         return err;
 291 }
 292
 293 static size_t dso__fprintf(struct dso *self, FILE *fp)
 294 {
 295         size_t ret = fprintf(fp, "dso: %s\n", self->name);
 296
 297         struct rb_node *nd;
 298         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
 299                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 300                 ret += symbol__fprintf(pos, fp);
 301         }
 302
 303         return ret;
 304 }
 305
 306 static LIST_HEAD(dsos);
 307 static struct dso *kernel_dso;
 308
 309 static void dsos__add(struct dso *dso)
 310 {
 311         list_add_tail(&dso->node, &dsos);
 312 }
 313
 314 static struct dso *dsos__find(const char *name)
 315 {
 316         struct dso *pos;
 317
 318         list_for_each_entry(pos, &dsos, node)
 319                 if (strcmp(pos->name, name) == 0)
 320                         return pos;
 321         return NULL;
 322 }
 323
 324 static struct dso *dsos__findnew(const char *name)
 325 {
 326         struct dso *dso = dsos__find(name);
 327
 328         if (dso == NULL) {
 329                 dso = dso__new(name);
 330                 if (dso != NULL && dso__load(dso) < 0)
 331                         goto out_delete_dso;
 332
 333                 dsos__add(dso);
 334         }
 335
 336         return dso;
 337
 338 out_delete_dso:
 339         dso__delete(dso);
 340         return NULL;
 341 }
 342
 343 void dsos__fprintf(FILE *fp)
 344 {
 345         struct dso *pos;
 346
 347         list_for_each_entry(pos, &dsos, node)
 348                 dso__fprintf(pos, fp);
 349 }
 350
 351 static int load_kallsyms(void)
 352 {
 353         kernel_dso = dso__new("[kernel]");
 354         if (kernel_dso == NULL)
 355                 return -1;
 356
 357         FILE *file = fopen("/proc/kallsyms", "r");
 358
 359         if (file == NULL)
 360                 goto out_delete_dso;
 361
 362         char *line = NULL;
 363         size_t n;
 364
 365         while (!feof(file)) {
 366                 unsigned long long start;
 367                 char c, symbf[4096];
 368
 369                 if (getline(&line, &n, file) < 0)
 370                         break;
 371
 372                 if (!line)
 373                         goto out_delete_dso;
 374
 375                 if (sscanf(line, "%llx %c %s", &start, &c, symbf) == 3) {
 376                         /*
 377                          * Well fix up the end later, when we have all sorted.
 378                          */
 379                         struct symbol *sym = symbol__new(start, 0xdead, symbf);
 380
 381                         if (sym == NULL)
 382                                 goto out_delete_dso;
 383
 384                         dso__insert_symbol(kernel_dso, sym);
 385                 }
 386         }
 387
 388         /*
 389          * Now that we have all sorted out, just set the ->end of all
 390          * symbols
 391          */
 392         struct rb_node *nd, *prevnd = rb_first(&kernel_dso->syms);
 393
 394         if (prevnd == NULL)
 395                 goto out_delete_line;
 396
 397         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 398                 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
 399                               *curr = rb_entry(nd, struct symbol, rb_node);
 400
 401                 prev->end = curr->start - 1;
 402                 prevnd = nd;
 403         }
 404
 405         dsos__add(kernel_dso);
 406         free(line);
 407         fclose(file);
 408         return 0;
 409
 410 out_delete_line:
 411         free(line);
 412 out_delete_dso:
 413         dso__delete(kernel_dso);
 414         return -1;
 415 }
 416
 417 struct map {
 418         struct list_head node;
 419         uint64_t         start;
 420         uint64_t         end;
 421         uint64_t         pgoff;
 422         struct dso       *dso;
 423 };
 424
 425 static struct map *map__new(struct mmap_event *event)
 426 {
 427         struct map *self = malloc(sizeof(*self));
 428
 429         if (self != NULL) {
 430                 self->start = event->start;
 431                 self->end   = event->start + event->len;
 432                 self->pgoff = event->pgoff;
 433
 434                 self->dso = dsos__findnew(event->filename);
 435                 if (self->dso == NULL)
 436                         goto out_delete;
 437         }
 438         return self;
 439 out_delete:
 440         free(self);
 441         return NULL;
 442 }
 443
 444 static size_t map__fprintf(struct map *self, FILE *fp)
 445 {
 446         return fprintf(fp, " %lx-%lx %lx %s\n",
 447                        self->start, self->end, self->pgoff, self->dso->name);
 448 }
 449
 450 struct symhist {
 451         struct rb_node   rb_node;
 452         struct dso       *dso;
 453         struct symbol    *sym;
 454         uint64_t         ip;
 455         uint32_t         count;
 456         char             level;
 457 };
 458
 459 static struct symhist *symhist__new(struct symbol *sym, uint64_t ip,
 460                                     struct dso *dso, char level)
 461 {
 462         struct symhist *self = malloc(sizeof(*self));
 463
 464         if (self != NULL) {
 465                 self->sym   = sym;
 466                 self->ip    = ip;
 467                 self->dso   = dso;
 468                 self->level = level;
 469                 self->count = 1;
 470         }
 471
 472         return self;
 473 }
 474
 475 void symhist__delete(struct symhist *self)
 476 {
 477         free(self);
 478 }
 479
 480 static void symhist__inc(struct symhist *self)
 481 {
 482         ++self->count;
 483 }
 484
 485 static size_t symhist__fprintf(struct symhist *self, FILE *fp)
 486 {
 487         size_t ret = fprintf(fp, "%#llx [%c] ", (unsigned long long)self->ip, self->level);
 488
 489         if (self->level != '.')
 490                 ret += fprintf(fp, "%s", self->sym ? self->sym->name: "<unknown>");
 491         else
 492                 ret += fprintf(fp, "%s: %s",
 493                                self->dso ? self->dso->name : "<unknown>",
 494                                self->sym ? self->sym->name : "<unknown>");
 495         return ret + fprintf(fp, ": %u\n", self->count);
 496 }
 497
 498 struct thread {
 499         struct rb_node   rb_node;
 500         struct list_head maps;
 501         struct rb_root   symhists;
 502         pid_t            pid;
 503         char             *comm;
 504 };
 505
 506 static struct thread *thread__new(pid_t pid)
 507 {
 508         struct thread *self = malloc(sizeof(*self));
 509
 510         if (self != NULL) {
 511                 self->pid = pid;
 512                 self->comm = NULL;
 513                 INIT_LIST_HEAD(&self->maps);
 514                 self->symhists = RB_ROOT;
 515         }
 516
 517         return self;
 518 }
 519
 520 static int thread__symbol_incnew(struct thread *self, struct symbol *sym,
 521                                  uint64_t ip, struct dso *dso, char level)
 522 {
 523         struct rb_node **p = &self->symhists.rb_node;
 524         struct rb_node *parent = NULL;
 525         struct symhist *sh;
 526
 527         while (*p != NULL) {
 528                 parent = *p;
 529                 sh = rb_entry(parent, struct symhist, rb_node);
 530
 531                 if (sh->sym == sym || ip == sh->ip) {
 532                         symhist__inc(sh);
 533                         return 0;
 534                 }
 535
 536                 /* Handle unresolved symbols too */
 537                 const uint64_t start = !sh->sym ? sh->ip : sh->sym->start;
 538
 539                 if (ip < start)
 540                         p = &(*p)->rb_left;
 541                 else
 542                         p = &(*p)->rb_right;
 543         }
 544
 545         sh = symhist__new(sym, ip, dso, level);
 546         if (sh == NULL)
 547                 return -ENOMEM;
 548         rb_link_node(&sh->rb_node, parent, p);
 549         rb_insert_color(&sh->rb_node, &self->symhists);
 550         return 0;
 551 }
 552
 553 static int thread__set_comm(struct thread *self, const char *comm)
 554 {
 555         self->comm = strdup(comm);
 556         return self->comm ? 0 : -ENOMEM;
 557 }
 558
 559 size_t thread__maps_fprintf(struct thread *self, FILE *fp)
 560 {
 561         struct map *pos;
 562         size_t ret = 0;
 563
 564         list_for_each_entry(pos, &self->maps, node)
 565                 ret += map__fprintf(pos, fp);
 566
 567         return ret;
 568 }
 569
 570 static size_t thread__fprintf(struct thread *self, FILE *fp)
 571 {
 572         int ret = fprintf(fp, "thread: %d %s\n", self->pid, self->comm);
 573         struct rb_node *nd;
 574
 575         for (nd = rb_first(&self->symhists); nd; nd = rb_next(nd)) {
 576                 struct symhist *pos = rb_entry(nd, struct symhist, rb_node);
 577                 ret += symhist__fprintf(pos, fp);
 578         }
 579
 580         return ret;
 581 }
 582
 583 static struct rb_root threads = RB_ROOT;
 584
 585 static struct thread *threads__findnew(pid_t pid)
 586 {
 587         struct rb_node **p = &threads.rb_node;
 588         struct rb_node *parent = NULL;
 589         struct thread *th;
 590
 591         while (*p != NULL) {
 592                 parent = *p;
 593                 th = rb_entry(parent, struct thread, rb_node);
 594
 595                 if (th->pid == pid)
 596                         return th;
 597
 598                 if (pid < th->pid)
 599                         p = &(*p)->rb_left;
 600                 else
 601                         p = &(*p)->rb_right;
 602         }
 603
 604         th = thread__new(pid);
 605         if (th != NULL) {
 606                 rb_link_node(&th->rb_node, parent, p);
 607                 rb_insert_color(&th->rb_node, &threads);
 608         }
 609         return th;
 610 }
 611
 612 static void thread__insert_map(struct thread *self, struct map *map)
 613 {
 614         list_add_tail(&map->node, &self->maps);
 615 }
 616
 617 static struct map *thread__find_map(struct thread *self, uint64_t ip)
 618 {
 619         if (self == NULL)
 620                 return NULL;
 621
 622         struct map *pos;
 623
 624         list_for_each_entry(pos, &self->maps, node)
 625                 if (ip >= pos->start && ip <= pos->end)
 626                         return pos;
 627
 628         return NULL;
 629 }
 630
 631 static void threads__fprintf(FILE *fp)
 632 {
 633         struct rb_node *nd;
 634         for (nd = rb_first(&threads); nd; nd = rb_next(nd)) {
 635                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 636                 thread__fprintf(pos, fp);
 637         }
 638 }
 639
 640 static int __cmd_report(void)
 641 {
 642         unsigned long offset = 0;
 643         unsigned long head = 0;
 644         struct stat stat;
 645         char *buf;
 646         event_t *event;
 647         int ret, rc = EXIT_FAILURE;
 648         uint32_t size;
 649         unsigned long total = 0, total_mmap = 0, total_comm = 0, total_unknown = 0;
 650
 651         input = open(input_name, O_RDONLY);
 652         if (input < 0) {
 653                 perror("failed to open file");
 654                 exit(-1);
 655         }
 656
 657         ret = fstat(input, &stat);
 658         if (ret < 0) {
 659                 perror("failed to stat file");
 660                 exit(-1);
 661         }
 662
 663         if (!stat.st_size) {
 664                 fprintf(stderr, "zero-sized file, nothing to do!\n");
 665                 exit(0);
 666         }
 667
 668         if (load_kallsyms() < 0) {
 669                 perror("failed to open kallsyms");
 670                 return EXIT_FAILURE;
 671         }
 672
 673 remap:
 674         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 675                            MAP_SHARED, input, offset);
 676         if (buf == MAP_FAILED) {
 677                 perror("failed to mmap file");
 678                 exit(-1);
 679         }
 680
 681 more:
 682         event = (event_t *)(buf + head);
 683
 684         size = event->header.size;
 685         if (!size)
 686                 size = 8;
 687
 688         if (head + event->header.size >= page_size * mmap_window) {
 689                 unsigned long shift = page_size * (head / page_size);
 690                 int ret;
 691
 692                 ret = munmap(buf, page_size * mmap_window);
 693                 assert(ret == 0);
 694
 695                 offset += shift;
 696                 head -= shift;
 697                 goto remap;
 698         }
 699
 700         size = event->header.size;
 701         if (!size)
 702                 goto broken_event;
 703
 704         if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
 705                 char level;
 706                 int show = 0;
 707                 struct dso *dso = NULL;
 708                 struct thread *thread = threads__findnew(event->ip.pid);
 709                 uint64_t ip = event->ip.ip;
 710
 711                 if (dump_trace) {
 712                         fprintf(stderr, "%p [%p]: PERF_EVENT (IP, %d): %d: %p\n",
 713                                 (void *)(offset + head),
 714                                 (void *)(long)(event->header.size),
 715                                 event->header.misc,
 716                                 event->ip.pid,
 717                                 (void *)event->ip.ip);
 718                 }
 719
 720                 if (thread == NULL) {
 721                         fprintf(stderr, "problem processing %d event, bailing out\n",
 722                                 event->header.type);
 723                         goto done;
 724                 }
 725
 726                 if (event->header.misc & PERF_EVENT_MISC_KERNEL) {
 727                         show = SHOW_KERNEL;
 728                         level = 'k';
 729                         dso = kernel_dso;
 730                 } else if (event->header.misc & PERF_EVENT_MISC_USER) {
 731                         show = SHOW_USER;
 732                         level = '.';
 733                         struct map *map = thread__find_map(thread, ip);
 734                         if (map != NULL) {
 735                                 dso = map->dso;
 736                                 ip -= map->start + map->pgoff;
 737                         }
 738                 } else {
 739                         show = SHOW_HV;
 740                         level = 'H';
 741                 }
 742
 743                 if (show & show_mask) {
 744                         struct symbol *sym = dso__find_symbol(dso, ip);
 745
 746                         if (thread__symbol_incnew(thread, sym, ip, dso, level)) {
 747                                 fprintf(stderr, "problem incrementing symbol count, bailing out\n");
 748                                 goto done;
 749                         }
 750                 }
 751                 total++;
 752         } else switch (event->header.type) {
 753         case PERF_EVENT_MMAP: {
 754                 struct thread *thread = threads__findnew(event->mmap.pid);
 755                 struct map *map = map__new(&event->mmap);
 756
 757                 if (dump_trace) {
 758                         fprintf(stderr, "%p [%p]: PERF_EVENT_MMAP: [%p(%p) @ %p]: %s\n",
 759                                 (void *)(offset + head),
 760                                 (void *)(long)(event->header.size),
 761                                 (void *)event->mmap.start,
 762                                 (void *)event->mmap.len,
 763                                 (void *)event->mmap.pgoff,
 764                                 event->mmap.filename);
 765                 }
 766                 if (thread == NULL || map == NULL) {
 767                         fprintf(stderr, "problem processing PERF_EVENT_MMAP, bailing out\n");
 768                         goto done;
 769                 }
 770                 thread__insert_map(thread, map);
 771                 total_mmap++;
 772                 break;
 773         }
 774         case PERF_EVENT_COMM: {
 775                 struct thread *thread = threads__findnew(event->comm.pid);
 776
 777                 if (dump_trace) {
 778                         fprintf(stderr, "%p [%p]: PERF_EVENT_COMM: %s:%d\n",
 779                                 (void *)(offset + head),
 780                                 (void *)(long)(event->header.size),
 781                                 event->comm.comm, event->comm.pid);
 782                 }
 783                 if (thread == NULL ||
 784                     thread__set_comm(thread, event->comm.comm)) {
 785                         fprintf(stderr, "problem processing PERF_EVENT_COMM, bailing out\n");
 786                         goto done;
 787                 }
 788                 total_comm++;
 789                 break;
 790         }
 791         default: {
 792 broken_event:
 793                 fprintf(stderr, "%p [%p]: skipping unknown header type: %d\n",
 794                         (void *)(offset + head),
 795                         (void *)(long)(event->header.size),
 796                         event->header.type);
 797                 total_unknown++;
 798
 799                 /*
 800                  * assume we lost track of the stream, check alignment, and
 801                  * increment a single u64 in the hope to catch on again 'soon'.
 802                  */
 803
 804                 if (unlikely(head & 7))
 805                         head &= ~7ULL;
 806
 807                 size = 8;
 808         }
 809         }
 810
 811         head += size;
 812
 813         if (offset + head < stat.st_size)
 814                 goto more;
 815
 816         rc = EXIT_SUCCESS;
 817 done:
 818         close(input);
 819
 820         if (dump_trace) {
 821                 fprintf(stderr, "      IP events: %10ld\n", total);
 822                 fprintf(stderr, "    mmap events: %10ld\n", total_mmap);
 823                 fprintf(stderr, "    comm events: %10ld\n", total_comm);
 824                 fprintf(stderr, " unknown events: %10ld\n", total_unknown);
 825
 826                 return 0;
 827         }
 828
 829         //dsos__fprintf(stdout);
 830         threads__fprintf(stdout);
 831 #if 0
 832         std::map<std::string, int>::iterator hi = hist.begin();
 833
 834         while (hi != hist.end()) {
 835                 rev_hist.insert(std::pair<int, std::string>(hi->second, hi->first));
 836                 hist.erase(hi++);
 837         }
 838
 839         std::multimap<int, std::string>::const_iterator ri = rev_hist.begin();
 840
 841         while (ri != rev_hist.end()) {
 842                 printf(" %5.2f %s\n", (100.0 * ri->first)/total, ri->second.c_str());
 843                 ri++;
 844         }
 845 #endif
 846         return rc;
 847 }
 848
 849 static const char * const report_usage[] = {
 850         "perf report [<options>] <command>",
 851         NULL
 852 };
 853
 854 static const struct option options[] = {
 855         OPT_STRING('i', "input", &input_name, "file",
 856                     "input file name"),
 857         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 858                     "dump raw trace in ASCII"),
 859         OPT_END()
 860 };
 861
 862 int cmd_report(int argc, const char **argv, const char *prefix)
 863 {
 864         elf_version(EV_CURRENT);
 865
 866         page_size = getpagesize();
 867
 868         parse_options(argc, argv, options, report_usage, 0);
 869
 870         return __cmd_report();
 871 }