Documentation/perf_counter/builtin-report.c

   1 #include "util/util.h"
   2 #include "builtin.h"
   3
   4 #include <libelf.h>
   5 #include <gelf.h>
   6 #include <elf.h>
   7
   8 #include "util/list.h"
   9 #include "util/cache.h"
  10 #include "util/rbtree.h"
  11
  12 #include "perf.h"
  13
  14 #include "util/parse-options.h"
  15 #include "util/parse-events.h"
  16
  17 #define SHOW_KERNEL     1
  18 #define SHOW_USER       2
  19 #define SHOW_HV         4
  20
  21 static char             const *input_name = "perf.data";
  22 static char             *vmlinux = NULL;
  23 static int              input;
  24 static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
  25
  26 static int              dump_trace = 0;
  27 static int              verbose;
  28
  29 static unsigned long    page_size;
  30 static unsigned long    mmap_window = 32;
  31
  32 const char *perf_event_names[] = {
  33         [PERF_EVENT_MMAP]   = " PERF_EVENT_MMAP",
  34         [PERF_EVENT_MUNMAP] = " PERF_EVENT_MUNMAP",
  35         [PERF_EVENT_COMM]   = " PERF_EVENT_COMM",
  36 };
  37
  38 struct ip_event {
  39         struct perf_event_header header;
  40         __u64 ip;
  41         __u32 pid, tid;
  42 };
  43 struct mmap_event {
  44         struct perf_event_header header;
  45         __u32 pid, tid;
  46         __u64 start;
  47         __u64 len;
  48         __u64 pgoff;
  49         char filename[PATH_MAX];
  50 };
  51 struct comm_event {
  52         struct perf_event_header header;
  53         __u32 pid,tid;
  54         char comm[16];
  55 };
  56
  57 typedef union event_union {
  58         struct perf_event_header header;
  59         struct ip_event ip;
  60         struct mmap_event mmap;
  61         struct comm_event comm;
  62 } event_t;
  63
  64 struct symbol {
  65         struct rb_node          rb_node;
  66         __u64                   start;
  67         __u64                   end;
  68         char                    name[0];
  69 };
  70
  71 static struct symbol *symbol__new(uint64_t start, uint64_t len, const char *name)
  72 {
  73         struct symbol *self = malloc(sizeof(*self) + strlen(name) + 1);
  74
  75         if (self != NULL) {
  76                 self->start = start;
  77                 self->end   = start + len;
  78                 strcpy(self->name, name);
  79         }
  80
  81         return self;
  82 }
  83
  84 static void symbol__delete(struct symbol *self)
  85 {
  86         free(self);
  87 }
  88
  89 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
  90 {
  91         return fprintf(fp, " %llx-%llx %s\n",
  92                        self->start, self->end, self->name);
  93 }
  94
  95 struct dso {
  96         struct list_head node;
  97         struct rb_root   syms;
  98         char             name[0];
  99 };
 100
 101 static struct dso *dso__new(const char *name)
 102 {
 103         struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);
 104
 105         if (self != NULL) {
 106                 strcpy(self->name, name);
 107                 self->syms = RB_ROOT;
 108         }
 109
 110         return self;
 111 }
 112
 113 static void dso__delete_symbols(struct dso *self)
 114 {
 115         struct symbol *pos;
 116         struct rb_node *next = rb_first(&self->syms);
 117
 118         while (next) {
 119                 pos = rb_entry(next, struct symbol, rb_node);
 120                 next = rb_next(&pos->rb_node);
 121                 symbol__delete(pos);
 122         }
 123 }
 124
 125 static void dso__delete(struct dso *self)
 126 {
 127         dso__delete_symbols(self);
 128         free(self);
 129 }
 130
 131 static void dso__insert_symbol(struct dso *self, struct symbol *sym)
 132 {
 133         struct rb_node **p = &self->syms.rb_node;
 134         struct rb_node *parent = NULL;
 135         const uint64_t ip = sym->start;
 136         struct symbol *s;
 137
 138         while (*p != NULL) {
 139                 parent = *p;
 140                 s = rb_entry(parent, struct symbol, rb_node);
 141                 if (ip < s->start)
 142                         p = &(*p)->rb_left;
 143                 else
 144                         p = &(*p)->rb_right;
 145         }
 146         rb_link_node(&sym->rb_node, parent, p);
 147         rb_insert_color(&sym->rb_node, &self->syms);
 148 }
 149
 150 static struct symbol *dso__find_symbol(struct dso *self, uint64_t ip)
 151 {
 152         struct rb_node *n;
 153
 154         if (self == NULL)
 155                 return NULL;
 156
 157         n = self->syms.rb_node;
 158
 159         while (n) {
 160                 struct symbol *s = rb_entry(n, struct symbol, rb_node);
 161
 162                 if (ip < s->start)
 163                         n = n->rb_left;
 164                 else if (ip > s->end)
 165                         n = n->rb_right;
 166                 else
 167                         return s;
 168         }
 169
 170         return NULL;
 171 }
 172
 173 /**
 174  * elf_symtab__for_each_symbol - iterate thru all the symbols
 175  *
 176  * @self: struct elf_symtab instance to iterate
 177  * @index: uint32_t index
 178  * @sym: GElf_Sym iterator
 179  */
 180 #define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
 181         for (index = 0, gelf_getsym(syms, index, &sym);\
 182              index < nr_syms; \
 183              index++, gelf_getsym(syms, index, &sym))
 184
 185 static inline uint8_t elf_sym__type(const GElf_Sym *sym)
 186 {
 187         return GELF_ST_TYPE(sym->st_info);
 188 }
 189
 190 static inline int elf_sym__is_function(const GElf_Sym *sym)
 191 {
 192         return elf_sym__type(sym) == STT_FUNC &&
 193                sym->st_name != 0 &&
 194                sym->st_shndx != SHN_UNDEF &&
 195                sym->st_size != 0;
 196 }
 197
 198 static inline const char *elf_sym__name(const GElf_Sym *sym,
 199                                         const Elf_Data *symstrs)
 200 {
 201         return symstrs->d_buf + sym->st_name;
 202 }
 203
 204 static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
 205                                     GElf_Shdr *shp, const char *name,
 206                                     size_t *index)
 207 {
 208         Elf_Scn *sec = NULL;
 209         size_t cnt = 1;
 210
 211         while ((sec = elf_nextscn(elf, sec)) != NULL) {
 212                 char *str;
 213
 214                 gelf_getshdr(sec, shp);
 215                 str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
 216                 if (!strcmp(name, str)) {
 217                         if (index)
 218                                 *index = cnt;
 219                         break;
 220                 }
 221                 ++cnt;
 222         }
 223
 224         return sec;
 225 }
 226
 227 static int dso__load_sym(struct dso *self, int fd, char *name)
 228 {
 229         Elf_Data *symstrs;
 230         uint32_t nr_syms;
 231         int err = -1;
 232         uint32_t index;
 233         GElf_Ehdr ehdr;
 234         GElf_Shdr shdr;
 235         Elf_Data *syms;
 236         GElf_Sym sym;
 237         Elf_Scn *sec;
 238         Elf *elf;
 239         int nr = 0;
 240
 241         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
 242         if (elf == NULL) {
 243                 fprintf(stderr, "%s: cannot read %s ELF file.\n",
 244                         __func__, name);
 245                 goto out_close;
 246         }
 247
 248         if (gelf_getehdr(elf, &ehdr) == NULL) {
 249                 fprintf(stderr, "%s: cannot get elf header.\n", __func__);
 250                 goto out_elf_end;
 251         }
 252
 253         sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
 254         if (sec == NULL)
 255                 sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);
 256
 257         if (sec == NULL)
 258                 goto out_elf_end;
 259
 260         syms = elf_getdata(sec, NULL);
 261         if (syms == NULL)
 262                 goto out_elf_end;
 263
 264         sec = elf_getscn(elf, shdr.sh_link);
 265         if (sec == NULL)
 266                 goto out_elf_end;
 267
 268         symstrs = elf_getdata(sec, NULL);
 269         if (symstrs == NULL)
 270                 goto out_elf_end;
 271
 272         nr_syms = shdr.sh_size / shdr.sh_entsize;
 273
 274         elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
 275                 struct symbol *f;
 276
 277                 if (!elf_sym__is_function(&sym))
 278                         continue;
 279
 280                 sec = elf_getscn(elf, sym.st_shndx);
 281                 if (!sec)
 282                         goto out_elf_end;
 283
 284                 gelf_getshdr(sec, &shdr);
 285                 sym.st_value -= shdr.sh_addr - shdr.sh_offset;
 286
 287                 f = symbol__new(sym.st_value, sym.st_size,
 288                                 elf_sym__name(&sym, symstrs));
 289                 if (!f)
 290                         goto out_elf_end;
 291
 292                 dso__insert_symbol(self, f);
 293
 294                 nr++;
 295         }
 296
 297         err = nr;
 298 out_elf_end:
 299         elf_end(elf);
 300 out_close:
 301         return err;
 302 }
 303
 304 static int dso__load(struct dso *self)
 305 {
 306         int size = strlen(self->name) + sizeof("/usr/lib/debug%s.debug");
 307         char *name = malloc(size);
 308         int variant = 0;
 309         int ret = -1;
 310         int fd;
 311
 312         if (!name)
 313                 return -1;
 314
 315 more:
 316         do {
 317                 switch (variant) {
 318                 case 0: /* Fedora */
 319                         snprintf(name, size, "/usr/lib/debug%s.debug", self->name);
 320                         break;
 321                 case 1: /* Ubuntu */
 322                         snprintf(name, size, "/usr/lib/debug%s", self->name);
 323                         break;
 324                 case 2: /* Sane people */
 325                         snprintf(name, size, "%s", self->name);
 326                         break;
 327
 328                 default:
 329                         goto out;
 330                 }
 331                 variant++;
 332
 333                 fd = open(name, O_RDONLY);
 334         } while (fd < 0);
 335
 336         ret = dso__load_sym(self, fd, name);
 337         close(fd);
 338
 339         /*
 340          * Some people seem to have debuginfo files _WITHOUT_ debug info!?!?
 341          */
 342         if (!ret)
 343                 goto more;
 344
 345 out:
 346         free(name);
 347         return ret;
 348 }
 349
 350 static size_t dso__fprintf(struct dso *self, FILE *fp)
 351 {
 352         size_t ret = fprintf(fp, "dso: %s\n", self->name);
 353
 354         struct rb_node *nd;
 355         for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
 356                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 357                 ret += symbol__fprintf(pos, fp);
 358         }
 359
 360         return ret;
 361 }
 362
 363 static LIST_HEAD(dsos);
 364 static struct dso *kernel_dso;
 365
 366 static void dsos__add(struct dso *dso)
 367 {
 368         list_add_tail(&dso->node, &dsos);
 369 }
 370
 371 static struct dso *dsos__find(const char *name)
 372 {
 373         struct dso *pos;
 374
 375         list_for_each_entry(pos, &dsos, node)
 376                 if (strcmp(pos->name, name) == 0)
 377                         return pos;
 378         return NULL;
 379 }
 380
 381 static struct dso *dsos__findnew(const char *name)
 382 {
 383         struct dso *dso = dsos__find(name);
 384         int nr;
 385
 386         if (dso == NULL) {
 387                 dso = dso__new(name);
 388                 if (!dso)
 389                         goto out_delete_dso;
 390
 391                 nr = dso__load(dso);
 392                 if (nr < 0) {
 393                         fprintf(stderr, "Failed to open: %s\n", name);
 394                         goto out_delete_dso;
 395                 }
 396                 if (!nr) {
 397                         fprintf(stderr,
 398                 "Failed to find debug symbols for: %s, maybe install a debug package?\n",
 399                                         name);
 400                 }
 401
 402                 dsos__add(dso);
 403         }
 404
 405         return dso;
 406
 407 out_delete_dso:
 408         dso__delete(dso);
 409         return NULL;
 410 }
 411
 412 static void dsos__fprintf(FILE *fp)
 413 {
 414         struct dso *pos;
 415
 416         list_for_each_entry(pos, &dsos, node)
 417                 dso__fprintf(pos, fp);
 418 }
 419
 420 static int hex(char ch)
 421 {
 422         if ((ch >= '0') && (ch <= '9'))
 423                 return ch - '0';
 424         if ((ch >= 'a') && (ch <= 'f'))
 425                 return ch - 'a' + 10;
 426         if ((ch >= 'A') && (ch <= 'F'))
 427                 return ch - 'A' + 10;
 428         return -1;
 429 }
 430
 431 /*
 432  * While we find nice hex chars, build a long_val.
 433  * Return number of chars processed.
 434  */
 435 static int hex2long(char *ptr, unsigned long *long_val)
 436 {
 437         const char *p = ptr;
 438         *long_val = 0;
 439
 440         while (*p) {
 441                 const int hex_val = hex(*p);
 442
 443                 if (hex_val < 0)
 444                         break;
 445
 446                 *long_val = (*long_val << 4) | hex_val;
 447                 p++;
 448         }
 449
 450         return p - ptr;
 451 }
 452
 453 static int load_kallsyms(void)
 454 {
 455         struct rb_node *nd, *prevnd;
 456         char *line = NULL;
 457         FILE *file;
 458         size_t n;
 459
 460         kernel_dso = dso__new("[kernel]");
 461         if (kernel_dso == NULL)
 462                 return -1;
 463
 464         file = fopen("/proc/kallsyms", "r");
 465         if (file == NULL)
 466                 goto out_delete_dso;
 467
 468         while (!feof(file)) {
 469                 unsigned long start;
 470                 struct symbol *sym;
 471                 int line_len, len;
 472                 char symbol_type;
 473
 474                 line_len = getline(&line, &n, file);
 475                 if (line_len < 0)
 476                         break;
 477
 478                 if (!line)
 479                         goto out_delete_dso;
 480
 481                 line[--line_len] = '\0'; /* \n */
 482
 483                 len = hex2long(line, &start);
 484
 485                 len++;
 486                 if (len + 2 >= line_len)
 487                         continue;
 488
 489                 symbol_type = toupper(line[len]);
 490                 /*
 491                  * We're interested only in code ('T'ext)
 492                  */
 493                 if (symbol_type != 'T' && symbol_type != 'W')
 494                         continue;
 495                 /*
 496                  * Well fix up the end later, when we have all sorted.
 497                  */
 498                 sym = symbol__new(start, 0xdead, line + len + 2);
 499
 500                 if (sym == NULL)
 501                         goto out_delete_dso;
 502
 503                 dso__insert_symbol(kernel_dso, sym);
 504         }
 505
 506         /*
 507          * Now that we have all sorted out, just set the ->end of all
 508          * symbols
 509          */
 510         prevnd = rb_first(&kernel_dso->syms);
 511
 512         if (prevnd == NULL)
 513                 goto out_delete_line;
 514
 515         for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 516                 struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
 517                               *curr = rb_entry(nd, struct symbol, rb_node);
 518
 519                 prev->end = curr->start - 1;
 520                 prevnd = nd;
 521         }
 522
 523         dsos__add(kernel_dso);
 524         free(line);
 525         fclose(file);
 526
 527         return 0;
 528
 529 out_delete_line:
 530         free(line);
 531 out_delete_dso:
 532         dso__delete(kernel_dso);
 533         return -1;
 534 }
 535
 536 static int load_kernel(void)
 537 {
 538         int fd, nr;
 539
 540         if (!vmlinux)
 541                 goto kallsyms;
 542
 543         fd = open(vmlinux, O_RDONLY);
 544         if (fd < 0)
 545                 goto kallsyms;
 546
 547         kernel_dso = dso__new("[kernel]");
 548         if (!kernel_dso)
 549                 goto fail_open;
 550
 551         nr = dso__load_sym(kernel_dso, fd, vmlinux);
 552
 553         if (nr <= 0)
 554                 goto fail_load;
 555
 556         dsos__add(kernel_dso);
 557         close(fd);
 558
 559         return 0;
 560
 561 fail_load:
 562         dso__delete(kernel_dso);
 563 fail_open:
 564         close(fd);
 565 kallsyms:
 566         return load_kallsyms();
 567 }
 568
 569 struct map {
 570         struct list_head node;
 571         uint64_t         start;
 572         uint64_t         end;
 573         uint64_t         pgoff;
 574         struct dso       *dso;
 575 };
 576
 577 static struct map *map__new(struct mmap_event *event)
 578 {
 579         struct map *self = malloc(sizeof(*self));
 580
 581         if (self != NULL) {
 582                 self->start = event->start;
 583                 self->end   = event->start + event->len;
 584                 self->pgoff = event->pgoff;
 585
 586                 self->dso = dsos__findnew(event->filename);
 587                 if (self->dso == NULL)
 588                         goto out_delete;
 589         }
 590         return self;
 591 out_delete:
 592         free(self);
 593         return NULL;
 594 }
 595
 596 struct thread;
 597
 598 static const char *thread__name(struct thread *self, char *bf, size_t size);
 599
 600 struct thread {
 601         struct rb_node   rb_node;
 602         struct list_head maps;
 603         pid_t            pid;
 604         char             *comm;
 605 };
 606
 607 static const char *thread__name(struct thread *self, char *bf, size_t size)
 608 {
 609         if (self->comm)
 610                 return self->comm;
 611
 612         snprintf(bf, sizeof(bf), ":%u", self->pid);
 613         return bf;
 614 }
 615
 616 static struct thread *thread__new(pid_t pid)
 617 {
 618         struct thread *self = malloc(sizeof(*self));
 619
 620         if (self != NULL) {
 621                 self->pid = pid;
 622                 self->comm = NULL;
 623                 INIT_LIST_HEAD(&self->maps);
 624         }
 625
 626         return self;
 627 }
 628
 629 static int thread__set_comm(struct thread *self, const char *comm)
 630 {
 631         self->comm = strdup(comm);
 632         return self->comm ? 0 : -ENOMEM;
 633 }
 634
 635 static struct rb_root threads;
 636
 637 static struct thread *threads__findnew(pid_t pid)
 638 {
 639         struct rb_node **p = &threads.rb_node;
 640         struct rb_node *parent = NULL;
 641         struct thread *th;
 642
 643         while (*p != NULL) {
 644                 parent = *p;
 645                 th = rb_entry(parent, struct thread, rb_node);
 646
 647                 if (th->pid == pid)
 648                         return th;
 649
 650                 if (pid < th->pid)
 651                         p = &(*p)->rb_left;
 652                 else
 653                         p = &(*p)->rb_right;
 654         }
 655
 656         th = thread__new(pid);
 657         if (th != NULL) {
 658                 rb_link_node(&th->rb_node, parent, p);
 659                 rb_insert_color(&th->rb_node, &threads);
 660         }
 661         return th;
 662 }
 663
 664 static void thread__insert_map(struct thread *self, struct map *map)
 665 {
 666         list_add_tail(&map->node, &self->maps);
 667 }
 668
 669 static struct map *thread__find_map(struct thread *self, uint64_t ip)
 670 {
 671         struct map *pos;
 672
 673         if (self == NULL)
 674                 return NULL;
 675
 676         list_for_each_entry(pos, &self->maps, node)
 677                 if (ip >= pos->start && ip <= pos->end)
 678                         return pos;
 679
 680         return NULL;
 681 }
 682
 683 /*
 684  * histogram, sorted on item, collects counts
 685  */
 686
 687 static struct rb_root hist;
 688
 689 struct hist_entry {
 690         struct rb_node   rb_node;
 691
 692         struct thread    *thread;
 693         struct map       *map;
 694         struct dso       *dso;
 695         struct symbol    *sym;
 696         uint64_t         ip;
 697         char             level;
 698
 699         uint32_t         count;
 700 };
 701
 702 static int64_t
 703 hist_entry__cmp(struct hist_entry *left, struct hist_entry *right)
 704 {
 705         uint64_t ip_l, ip_r;
 706         int cmp = right->thread->pid - left->thread->pid;
 707
 708         if (cmp)
 709                 return cmp;
 710
 711         if (left->sym == right->sym)
 712                 return 0;
 713
 714         ip_l = left->sym ? left->sym->start : left->ip;
 715         ip_r = right->sym ? right->sym->start : right->ip;
 716
 717         return (int64_t)(ip_r - ip_l);
 718 }
 719
 720 static int
 721 hist_entry__add(struct thread *thread, struct map *map, struct dso *dso,
 722                 struct symbol *sym, uint64_t ip, char level)
 723 {
 724         struct rb_node **p = &hist.rb_node;
 725         struct rb_node *parent = NULL;
 726         struct hist_entry *he;
 727         struct hist_entry entry = {
 728                 .thread = thread,
 729                 .map    = map,
 730                 .dso    = dso,
 731                 .sym    = sym,
 732                 .ip     = ip,
 733                 .level  = level,
 734                 .count  = 1,
 735         };
 736         int cmp;
 737
 738         while (*p != NULL) {
 739                 parent = *p;
 740                 he = rb_entry(parent, struct hist_entry, rb_node);
 741
 742                 cmp = hist_entry__cmp(&entry, he);
 743
 744                 if (!cmp) {
 745                         he->count++;
 746                         return 0;
 747                 }
 748
 749                 if (cmp < 0)
 750                         p = &(*p)->rb_left;
 751                 else
 752                         p = &(*p)->rb_right;
 753         }
 754
 755         he = malloc(sizeof(*he));
 756         if (!he)
 757                 return -ENOMEM;
 758         *he = entry;
 759         rb_link_node(&he->rb_node, parent, p);
 760         rb_insert_color(&he->rb_node, &hist);
 761
 762         return 0;
 763 }
 764
 765 static size_t
 766 hist_entry__fprintf(FILE *fp, struct hist_entry *self, uint64_t total_samples)
 767 {
 768         char bf[32];
 769         size_t ret;
 770
 771         if (total_samples) {
 772                 ret = fprintf(fp, "%5.2f%% ",
 773                                 (self->count * 100.0) / total_samples);
 774         } else
 775                 ret = fprintf(fp, "%12d ", self->count);
 776
 777         ret += fprintf(fp, "%14s [%c] ",
 778                        thread__name(self->thread, bf, sizeof(bf)),
 779                        self->level);
 780
 781         if (verbose)
 782                 ret += fprintf(fp, "%#018llx ", (unsigned long long)self->ip);
 783
 784         if (self->level != '.')
 785                 ret += fprintf(fp, "%s\n",
 786                                self->sym ? self->sym->name : "<unknown>");
 787         else
 788                 ret += fprintf(fp, "%s: %s\n",
 789                                self->dso ? self->dso->name : "<unknown>",
 790                                self->sym ? self->sym->name : "<unknown>");
 791         return ret;
 792 }
 793
 794 /*
 795  * reverse the map, sort on count.
 796  */
 797
 798 static struct rb_root output_hists;
 799
 800 static void output__insert_entry(struct hist_entry *he)
 801 {
 802         struct rb_node **p = &output_hists.rb_node;
 803         struct rb_node *parent = NULL;
 804         struct hist_entry *iter;
 805
 806         while (*p != NULL) {
 807                 parent = *p;
 808                 iter = rb_entry(parent, struct hist_entry, rb_node);
 809
 810                 if (he->count > iter->count)
 811                         p = &(*p)->rb_left;
 812                 else
 813                         p = &(*p)->rb_right;
 814         }
 815
 816         rb_link_node(&he->rb_node, parent, p);
 817         rb_insert_color(&he->rb_node, &output_hists);
 818 }
 819
 820 static void output__resort(void)
 821 {
 822         struct rb_node *next = rb_first(&hist);
 823         struct hist_entry *n;
 824
 825         while (next) {
 826                 n = rb_entry(next, struct hist_entry, rb_node);
 827                 next = rb_next(&n->rb_node);
 828
 829                 rb_erase(&n->rb_node, &hist);
 830                 output__insert_entry(n);
 831         }
 832 }
 833
 834 static size_t output__fprintf(FILE *fp, uint64_t total_samples)
 835 {
 836         struct hist_entry *pos;
 837         struct rb_node *nd;
 838         size_t ret = 0;
 839
 840         for (nd = rb_first(&output_hists); nd; nd = rb_next(nd)) {
 841                 pos = rb_entry(nd, struct hist_entry, rb_node);
 842                 ret += hist_entry__fprintf(fp, pos, total_samples);
 843         }
 844
 845         return ret;
 846 }
 847
 848
 849 static int __cmd_report(void)
 850 {
 851         unsigned long offset = 0;
 852         unsigned long head = 0;
 853         struct stat stat;
 854         char *buf;
 855         event_t *event;
 856         int ret, rc = EXIT_FAILURE;
 857         uint32_t size;
 858         unsigned long total = 0, total_mmap = 0, total_comm = 0, total_unknown = 0;
 859
 860         input = open(input_name, O_RDONLY);
 861         if (input < 0) {
 862                 perror("failed to open file");
 863                 exit(-1);
 864         }
 865
 866         ret = fstat(input, &stat);
 867         if (ret < 0) {
 868                 perror("failed to stat file");
 869                 exit(-1);
 870         }
 871
 872         if (!stat.st_size) {
 873                 fprintf(stderr, "zero-sized file, nothing to do!\n");
 874                 exit(0);
 875         }
 876
 877         if (load_kernel() < 0) {
 878                 perror("failed to open kallsyms");
 879                 return EXIT_FAILURE;
 880         }
 881
 882 remap:
 883         buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
 884                            MAP_SHARED, input, offset);
 885         if (buf == MAP_FAILED) {
 886                 perror("failed to mmap file");
 887                 exit(-1);
 888         }
 889
 890 more:
 891         event = (event_t *)(buf + head);
 892
 893         size = event->header.size;
 894         if (!size)
 895                 size = 8;
 896
 897         if (head + event->header.size >= page_size * mmap_window) {
 898                 unsigned long shift = page_size * (head / page_size);
 899                 int ret;
 900
 901                 ret = munmap(buf, page_size * mmap_window);
 902                 assert(ret == 0);
 903
 904                 offset += shift;
 905                 head -= shift;
 906                 goto remap;
 907         }
 908
 909         size = event->header.size;
 910         if (!size)
 911                 goto broken_event;
 912
 913         if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
 914                 char level;
 915                 int show = 0;
 916                 struct dso *dso = NULL;
 917                 struct thread *thread = threads__findnew(event->ip.pid);
 918                 uint64_t ip = event->ip.ip;
 919                 struct map *map = NULL;
 920
 921                 if (dump_trace) {
 922                         fprintf(stderr, "%p [%p]: PERF_EVENT (IP, %d): %d: %p\n",
 923                                 (void *)(offset + head),
 924                                 (void *)(long)(event->header.size),
 925                                 event->header.misc,
 926                                 event->ip.pid,
 927                                 (void *)(long)ip);
 928                 }
 929
 930                 if (thread == NULL) {
 931                         fprintf(stderr, "problem processing %d event, bailing out\n",
 932                                 event->header.type);
 933                         goto done;
 934                 }
 935
 936                 if (event->header.misc & PERF_EVENT_MISC_KERNEL) {
 937                         show = SHOW_KERNEL;
 938                         level = 'k';
 939
 940                         dso = kernel_dso;
 941
 942                 } else if (event->header.misc & PERF_EVENT_MISC_USER) {
 943
 944                         show = SHOW_USER;
 945                         level = '.';
 946
 947                         map = thread__find_map(thread, ip);
 948                         if (map != NULL) {
 949                                 dso = map->dso;
 950                                 ip -= map->start + map->pgoff;
 951                         }
 952
 953                 } else {
 954                         show = SHOW_HV;
 955                         level = 'H';
 956                 }
 957
 958                 if (show & show_mask) {
 959                         struct symbol *sym = dso__find_symbol(dso, ip);
 960
 961                         if (hist_entry__add(thread, map, dso, sym, ip, level)) {
 962                                 fprintf(stderr,
 963                 "problem incrementing symbol count, bailing out\n");
 964                                 goto done;
 965                         }
 966                 }
 967                 total++;
 968         } else switch (event->header.type) {
 969         case PERF_EVENT_MMAP: {
 970                 struct thread *thread = threads__findnew(event->mmap.pid);
 971                 struct map *map = map__new(&event->mmap);
 972
 973                 if (dump_trace) {
 974                         fprintf(stderr, "%p [%p]: PERF_EVENT_MMAP: [%p(%p) @ %p]: %s\n",
 975                                 (void *)(offset + head),
 976                                 (void *)(long)(event->header.size),
 977                                 (void *)(long)event->mmap.start,
 978                                 (void *)(long)event->mmap.len,
 979                                 (void *)(long)event->mmap.pgoff,
 980                                 event->mmap.filename);
 981                 }
 982                 if (thread == NULL || map == NULL) {
 983                         fprintf(stderr, "problem processing PERF_EVENT_MMAP, bailing out\n");
 984                         goto done;
 985                 }
 986                 thread__insert_map(thread, map);
 987                 total_mmap++;
 988                 break;
 989         }
 990         case PERF_EVENT_COMM: {
 991                 struct thread *thread = threads__findnew(event->comm.pid);
 992
 993                 if (dump_trace) {
 994                         fprintf(stderr, "%p [%p]: PERF_EVENT_COMM: %s:%d\n",
 995                                 (void *)(offset + head),
 996                                 (void *)(long)(event->header.size),
 997                                 event->comm.comm, event->comm.pid);
 998                 }
 999                 if (thread == NULL ||
1000                     thread__set_comm(thread, event->comm.comm)) {
1001                         fprintf(stderr, "problem processing PERF_EVENT_COMM, bailing out\n");
1002                         goto done;
1003                 }
1004                 total_comm++;
1005                 break;
1006         }
1007         default: {
1008 broken_event:
1009                 if (dump_trace)
1010                         fprintf(stderr, "%p [%p]: skipping unknown header type: %d\n",
1011                                         (void *)(offset + head),
1012                                         (void *)(long)(event->header.size),
1013                                         event->header.type);
1014
1015                 total_unknown++;
1016
1017                 /*
1018                  * assume we lost track of the stream, check alignment, and
1019                  * increment a single u64 in the hope to catch on again 'soon'.
1020                  */
1021
1022                 if (unlikely(head & 7))
1023                         head &= ~7ULL;
1024
1025                 size = 8;
1026         }
1027         }
1028
1029         head += size;
1030
1031         if (offset + head < stat.st_size)
1032                 goto more;
1033
1034         rc = EXIT_SUCCESS;
1035 done:
1036         close(input);
1037
1038         if (dump_trace) {
1039                 fprintf(stderr, "      IP events: %10ld\n", total);
1040                 fprintf(stderr, "    mmap events: %10ld\n", total_mmap);
1041                 fprintf(stderr, "    comm events: %10ld\n", total_comm);
1042                 fprintf(stderr, " unknown events: %10ld\n", total_unknown);
1043
1044                 return 0;
1045         }
1046
1047         if (verbose >= 2)
1048                 dsos__fprintf(stdout);
1049
1050         output__resort();
1051         output__fprintf(stdout, total);
1052
1053         return rc;
1054 }
1055
1056 static const char * const report_usage[] = {
1057         "perf report [<options>] <command>",
1058         NULL
1059 };
1060
1061 static const struct option options[] = {
1062         OPT_STRING('i', "input", &input_name, "file",
1063                     "input file name"),
1064         OPT_BOOLEAN('v', "verbose", &verbose,
1065                     "be more verbose (show symbol address, etc)"),
1066         OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
1067                     "dump raw trace in ASCII"),
1068         OPT_STRING('k', "vmlinux", &vmlinux, "file", "vmlinux pathname"),
1069         OPT_END()
1070 };
1071
1072 int cmd_report(int argc, const char **argv, const char *prefix)
1073 {
1074         elf_version(EV_CURRENT);
1075
1076         page_size = getpagesize();
1077
1078         parse_options(argc, argv, options, report_usage, 0);
1079
1080         setup_pager();
1081
1082         return __cmd_report();
1083 }