tools/perf/util/machine.c

   1 #include "callchain.h"
   2 #include "debug.h"
   3 #include "event.h"
   4 #include "evsel.h"
   5 #include "hist.h"
   6 #include "machine.h"
   7 #include "map.h"
   8 #include "sort.h"
   9 #include "strlist.h"
  10 #include "thread.h"
  11 #include <stdbool.h>
  12 #include <symbol/kallsyms.h>
  13 #include "unwind.h"
  14
  15 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
  16 {
  17         map_groups__init(&machine->kmaps);
  18         RB_CLEAR_NODE(&machine->rb_node);
  19         INIT_LIST_HEAD(&machine->user_dsos);
  20         INIT_LIST_HEAD(&machine->kernel_dsos);
  21
  22         machine->threads = RB_ROOT;
  23         INIT_LIST_HEAD(&machine->dead_threads);
  24         machine->last_match = NULL;
  25
  26         machine->kmaps.machine = machine;
  27         machine->pid = pid;
  28
  29         machine->symbol_filter = NULL;
  30         machine->id_hdr_size = 0;
  31
  32         machine->root_dir = strdup(root_dir);
  33         if (machine->root_dir == NULL)
  34                 return -ENOMEM;
  35
  36         if (pid != HOST_KERNEL_ID) {
  37                 struct thread *thread = machine__findnew_thread(machine, 0,
  38                                                                 pid);
  39                 char comm[64];
  40
  41                 if (thread == NULL)
  42                         return -ENOMEM;
  43
  44                 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
  45                 thread__set_comm(thread, comm, 0);
  46         }
  47
  48         return 0;
  49 }
  50
  51 struct machine *machine__new_host(void)
  52 {
  53         struct machine *machine = malloc(sizeof(*machine));
  54
  55         if (machine != NULL) {
  56                 machine__init(machine, "", HOST_KERNEL_ID);
  57
  58                 if (machine__create_kernel_maps(machine) < 0)
  59                         goto out_delete;
  60         }
  61
  62         return machine;
  63 out_delete:
  64         free(machine);
  65         return NULL;
  66 }
  67
  68 static void dsos__delete(struct list_head *dsos)
  69 {
  70         struct dso *pos, *n;
  71
  72         list_for_each_entry_safe(pos, n, dsos, node) {
  73                 list_del(&pos->node);
  74                 dso__delete(pos);
  75         }
  76 }
  77
  78 void machine__delete_dead_threads(struct machine *machine)
  79 {
  80         struct thread *n, *t;
  81
  82         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
  83                 list_del(&t->node);
  84                 thread__delete(t);
  85         }
  86 }
  87
  88 void machine__delete_threads(struct machine *machine)
  89 {
  90         struct rb_node *nd = rb_first(&machine->threads);
  91
  92         while (nd) {
  93                 struct thread *t = rb_entry(nd, struct thread, rb_node);
  94
  95                 rb_erase(&t->rb_node, &machine->threads);
  96                 nd = rb_next(nd);
  97                 thread__delete(t);
  98         }
  99 }
 100
 101 void machine__exit(struct machine *machine)
 102 {
 103         map_groups__exit(&machine->kmaps);
 104         dsos__delete(&machine->user_dsos);
 105         dsos__delete(&machine->kernel_dsos);
 106         zfree(&machine->root_dir);
 107 }
 108
 109 void machine__delete(struct machine *machine)
 110 {
 111         machine__exit(machine);
 112         free(machine);
 113 }
 114
 115 void machines__init(struct machines *machines)
 116 {
 117         machine__init(&machines->host, "", HOST_KERNEL_ID);
 118         machines->guests = RB_ROOT;
 119         machines->symbol_filter = NULL;
 120 }
 121
 122 void machines__exit(struct machines *machines)
 123 {
 124         machine__exit(&machines->host);
 125         /* XXX exit guest */
 126 }
 127
 128 struct machine *machines__add(struct machines *machines, pid_t pid,
 129                               const char *root_dir)
 130 {
 131         struct rb_node **p = &machines->guests.rb_node;
 132         struct rb_node *parent = NULL;
 133         struct machine *pos, *machine = malloc(sizeof(*machine));
 134
 135         if (machine == NULL)
 136                 return NULL;
 137
 138         if (machine__init(machine, root_dir, pid) != 0) {
 139                 free(machine);
 140                 return NULL;
 141         }
 142
 143         machine->symbol_filter = machines->symbol_filter;
 144
 145         while (*p != NULL) {
 146                 parent = *p;
 147                 pos = rb_entry(parent, struct machine, rb_node);
 148                 if (pid < pos->pid)
 149                         p = &(*p)->rb_left;
 150                 else
 151                         p = &(*p)->rb_right;
 152         }
 153
 154         rb_link_node(&machine->rb_node, parent, p);
 155         rb_insert_color(&machine->rb_node, &machines->guests);
 156
 157         return machine;
 158 }
 159
 160 void machines__set_symbol_filter(struct machines *machines,
 161                                  symbol_filter_t symbol_filter)
 162 {
 163         struct rb_node *nd;
 164
 165         machines->symbol_filter = symbol_filter;
 166         machines->host.symbol_filter = symbol_filter;
 167
 168         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 169                 struct machine *machine = rb_entry(nd, struct machine, rb_node);
 170
 171                 machine->symbol_filter = symbol_filter;
 172         }
 173 }
 174
 175 struct machine *machines__find(struct machines *machines, pid_t pid)
 176 {
 177         struct rb_node **p = &machines->guests.rb_node;
 178         struct rb_node *parent = NULL;
 179         struct machine *machine;
 180         struct machine *default_machine = NULL;
 181
 182         if (pid == HOST_KERNEL_ID)
 183                 return &machines->host;
 184
 185         while (*p != NULL) {
 186                 parent = *p;
 187                 machine = rb_entry(parent, struct machine, rb_node);
 188                 if (pid < machine->pid)
 189                         p = &(*p)->rb_left;
 190                 else if (pid > machine->pid)
 191                         p = &(*p)->rb_right;
 192                 else
 193                         return machine;
 194                 if (!machine->pid)
 195                         default_machine = machine;
 196         }
 197
 198         return default_machine;
 199 }
 200
 201 struct machine *machines__findnew(struct machines *machines, pid_t pid)
 202 {
 203         char path[PATH_MAX];
 204         const char *root_dir = "";
 205         struct machine *machine = machines__find(machines, pid);
 206
 207         if (machine && (machine->pid == pid))
 208                 goto out;
 209
 210         if ((pid != HOST_KERNEL_ID) &&
 211             (pid != DEFAULT_GUEST_KERNEL_ID) &&
 212             (symbol_conf.guestmount)) {
 213                 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
 214                 if (access(path, R_OK)) {
 215                         static struct strlist *seen;
 216
 217                         if (!seen)
 218                                 seen = strlist__new(true, NULL);
 219
 220                         if (!strlist__has_entry(seen, path)) {
 221                                 pr_err("Can't access file %s\n", path);
 222                                 strlist__add(seen, path);
 223                         }
 224                         machine = NULL;
 225                         goto out;
 226                 }
 227                 root_dir = path;
 228         }
 229
 230         machine = machines__add(machines, pid, root_dir);
 231 out:
 232         return machine;
 233 }
 234
 235 void machines__process_guests(struct machines *machines,
 236                               machine__process_t process, void *data)
 237 {
 238         struct rb_node *nd;
 239
 240         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 241                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 242                 process(pos, data);
 243         }
 244 }
 245
 246 char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
 247 {
 248         if (machine__is_host(machine))
 249                 snprintf(bf, size, "[%s]", "kernel.kallsyms");
 250         else if (machine__is_default_guest(machine))
 251                 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
 252         else {
 253                 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
 254                          machine->pid);
 255         }
 256
 257         return bf;
 258 }
 259
 260 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 261 {
 262         struct rb_node *node;
 263         struct machine *machine;
 264
 265         machines->host.id_hdr_size = id_hdr_size;
 266
 267         for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
 268                 machine = rb_entry(node, struct machine, rb_node);
 269                 machine->id_hdr_size = id_hdr_size;
 270         }
 271
 272         return;
 273 }
 274
 275 static struct thread *__machine__findnew_thread(struct machine *machine,
 276                                                 pid_t pid, pid_t tid,
 277                                                 bool create)
 278 {
 279         struct rb_node **p = &machine->threads.rb_node;
 280         struct rb_node *parent = NULL;
 281         struct thread *th;
 282
 283         /*
 284          * Front-end cache - TID lookups come in blocks,
 285          * so most of the time we dont have to look up
 286          * the full rbtree:
 287          */
 288         if (machine->last_match && machine->last_match->tid == tid) {
 289                 if (pid && pid != machine->last_match->pid_)
 290                         machine->last_match->pid_ = pid;
 291                 return machine->last_match;
 292         }
 293
 294         while (*p != NULL) {
 295                 parent = *p;
 296                 th = rb_entry(parent, struct thread, rb_node);
 297
 298                 if (th->tid == tid) {
 299                         machine->last_match = th;
 300                         if (pid && pid != th->pid_)
 301                                 th->pid_ = pid;
 302                         return th;
 303                 }
 304
 305                 if (tid < th->tid)
 306                         p = &(*p)->rb_left;
 307                 else
 308                         p = &(*p)->rb_right;
 309         }
 310
 311         if (!create)
 312                 return NULL;
 313
 314         th = thread__new(pid, tid);
 315         if (th != NULL) {
 316                 rb_link_node(&th->rb_node, parent, p);
 317                 rb_insert_color(&th->rb_node, &machine->threads);
 318                 machine->last_match = th;
 319
 320                 /*
 321                  * We have to initialize map_groups separately
 322                  * after rb tree is updated.
 323                  *
 324                  * The reason is that we call machine__findnew_thread
 325                  * within thread__init_map_groups to find the thread
 326                  * leader and that would screwed the rb tree.
 327                  */
 328                 if (thread__init_map_groups(th, machine))
 329                         return NULL;
 330         }
 331
 332         return th;
 333 }
 334
 335 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
 336                                        pid_t tid)
 337 {
 338         return __machine__findnew_thread(machine, pid, tid, true);
 339 }
 340
 341 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
 342                                     pid_t tid)
 343 {
 344         return __machine__findnew_thread(machine, pid, tid, false);
 345 }
 346
 347 int machine__process_comm_event(struct machine *machine, union perf_event *event,
 348                                 struct perf_sample *sample)
 349 {
 350         struct thread *thread = machine__findnew_thread(machine,
 351                                                         event->comm.pid,
 352                                                         event->comm.tid);
 353
 354         if (dump_trace)
 355                 perf_event__fprintf_comm(event, stdout);
 356
 357         if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
 358                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 359                 return -1;
 360         }
 361
 362         return 0;
 363 }
 364
 365 int machine__process_lost_event(struct machine *machine __maybe_unused,
 366                                 union perf_event *event, struct perf_sample *sample __maybe_unused)
 367 {
 368         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 369                     event->lost.id, event->lost.lost);
 370         return 0;
 371 }
 372
 373 struct map *machine__new_module(struct machine *machine, u64 start,
 374                                 const char *filename)
 375 {
 376         struct map *map;
 377         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
 378
 379         if (dso == NULL)
 380                 return NULL;
 381
 382         map = map__new2(start, dso, MAP__FUNCTION);
 383         if (map == NULL)
 384                 return NULL;
 385
 386         if (machine__is_host(machine))
 387                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 388         else
 389                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 390         map_groups__insert(&machine->kmaps, map);
 391         return map;
 392 }
 393
 394 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 395 {
 396         struct rb_node *nd;
 397         size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
 398                      __dsos__fprintf(&machines->host.user_dsos, fp);
 399
 400         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 401                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 402                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 403                 ret += __dsos__fprintf(&pos->user_dsos, fp);
 404         }
 405
 406         return ret;
 407 }
 408
 409 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 410                                      bool (skip)(struct dso *dso, int parm), int parm)
 411 {
 412         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
 413                __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 414 }
 415
 416 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 417                                      bool (skip)(struct dso *dso, int parm), int parm)
 418 {
 419         struct rb_node *nd;
 420         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 421
 422         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 423                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 424                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 425         }
 426         return ret;
 427 }
 428
 429 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 430 {
 431         int i;
 432         size_t printed = 0;
 433         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
 434
 435         if (kdso->has_build_id) {
 436                 char filename[PATH_MAX];
 437                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 438                         printed += fprintf(fp, "[0] %s\n", filename);
 439         }
 440
 441         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 442                 printed += fprintf(fp, "[%d] %s\n",
 443                                    i + kdso->has_build_id, vmlinux_path[i]);
 444
 445         return printed;
 446 }
 447
 448 size_t machine__fprintf(struct machine *machine, FILE *fp)
 449 {
 450         size_t ret = 0;
 451         struct rb_node *nd;
 452
 453         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 454                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 455
 456                 ret += thread__fprintf(pos, fp);
 457         }
 458
 459         return ret;
 460 }
 461
 462 static struct dso *machine__get_kernel(struct machine *machine)
 463 {
 464         const char *vmlinux_name = NULL;
 465         struct dso *kernel;
 466
 467         if (machine__is_host(machine)) {
 468                 vmlinux_name = symbol_conf.vmlinux_name;
 469                 if (!vmlinux_name)
 470                         vmlinux_name = "[kernel.kallsyms]";
 471
 472                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 473                                              "[kernel]",
 474                                              DSO_TYPE_KERNEL);
 475         } else {
 476                 char bf[PATH_MAX];
 477
 478                 if (machine__is_default_guest(machine))
 479                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 480                 if (!vmlinux_name)
 481                         vmlinux_name = machine__mmap_name(machine, bf,
 482                                                           sizeof(bf));
 483
 484                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 485                                              "[guest.kernel]",
 486                                              DSO_TYPE_GUEST_KERNEL);
 487         }
 488
 489         if (kernel != NULL && (!kernel->has_build_id))
 490                 dso__read_running_kernel_build_id(kernel, machine);
 491
 492         return kernel;
 493 }
 494
 495 struct process_args {
 496         u64 start;
 497 };
 498
 499 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 500                                            size_t bufsz)
 501 {
 502         if (machine__is_default_guest(machine))
 503                 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
 504         else
 505                 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
 506 }
 507
 508 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
 509
 510 /* Figure out the start address of kernel map from /proc/kallsyms.
 511  * Returns the name of the start symbol in *symbol_name. Pass in NULL as
 512  * symbol_name if it's not that important.
 513  */
 514 static u64 machine__get_kernel_start_addr(struct machine *machine,
 515                                           const char **symbol_name)
 516 {
 517         char filename[PATH_MAX];
 518         int i;
 519         const char *name;
 520         u64 addr = 0;
 521
 522         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 523
 524         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 525                 return 0;
 526
 527         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 528                 addr = kallsyms__get_function_start(filename, name);
 529                 if (addr)
 530                         break;
 531         }
 532
 533         if (symbol_name)
 534                 *symbol_name = name;
 535
 536         return addr;
 537 }
 538
 539 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 540 {
 541         enum map_type type;
 542         u64 start = machine__get_kernel_start_addr(machine, NULL);
 543
 544         for (type = 0; type < MAP__NR_TYPES; ++type) {
 545                 struct kmap *kmap;
 546
 547                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 548                 if (machine->vmlinux_maps[type] == NULL)
 549                         return -1;
 550
 551                 machine->vmlinux_maps[type]->map_ip =
 552                         machine->vmlinux_maps[type]->unmap_ip =
 553                                 identity__map_ip;
 554                 kmap = map__kmap(machine->vmlinux_maps[type]);
 555                 kmap->kmaps = &machine->kmaps;
 556                 map_groups__insert(&machine->kmaps,
 557                                    machine->vmlinux_maps[type]);
 558         }
 559
 560         return 0;
 561 }
 562
 563 void machine__destroy_kernel_maps(struct machine *machine)
 564 {
 565         enum map_type type;
 566
 567         for (type = 0; type < MAP__NR_TYPES; ++type) {
 568                 struct kmap *kmap;
 569
 570                 if (machine->vmlinux_maps[type] == NULL)
 571                         continue;
 572
 573                 kmap = map__kmap(machine->vmlinux_maps[type]);
 574                 map_groups__remove(&machine->kmaps,
 575                                    machine->vmlinux_maps[type]);
 576                 if (kmap->ref_reloc_sym) {
 577                         /*
 578                          * ref_reloc_sym is shared among all maps, so free just
 579                          * on one of them.
 580                          */
 581                         if (type == MAP__FUNCTION) {
 582                                 zfree((char **)&kmap->ref_reloc_sym->name);
 583                                 zfree(&kmap->ref_reloc_sym);
 584                         } else
 585                                 kmap->ref_reloc_sym = NULL;
 586                 }
 587
 588                 map__delete(machine->vmlinux_maps[type]);
 589                 machine->vmlinux_maps[type] = NULL;
 590         }
 591 }
 592
 593 int machines__create_guest_kernel_maps(struct machines *machines)
 594 {
 595         int ret = 0;
 596         struct dirent **namelist = NULL;
 597         int i, items = 0;
 598         char path[PATH_MAX];
 599         pid_t pid;
 600         char *endp;
 601
 602         if (symbol_conf.default_guest_vmlinux_name ||
 603             symbol_conf.default_guest_modules ||
 604             symbol_conf.default_guest_kallsyms) {
 605                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 606         }
 607
 608         if (symbol_conf.guestmount) {
 609                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 610                 if (items <= 0)
 611                         return -ENOENT;
 612                 for (i = 0; i < items; i++) {
 613                         if (!isdigit(namelist[i]->d_name[0])) {
 614                                 /* Filter out . and .. */
 615                                 continue;
 616                         }
 617                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 618                         if ((*endp != '\0') ||
 619                             (endp == namelist[i]->d_name) ||
 620                             (errno == ERANGE)) {
 621                                 pr_debug("invalid directory (%s). Skipping.\n",
 622                                          namelist[i]->d_name);
 623                                 continue;
 624                         }
 625                         sprintf(path, "%s/%s/proc/kallsyms",
 626                                 symbol_conf.guestmount,
 627                                 namelist[i]->d_name);
 628                         ret = access(path, R_OK);
 629                         if (ret) {
 630                                 pr_debug("Can't access file %s\n", path);
 631                                 goto failure;
 632                         }
 633                         machines__create_kernel_maps(machines, pid);
 634                 }
 635 failure:
 636                 free(namelist);
 637         }
 638
 639         return ret;
 640 }
 641
 642 void machines__destroy_kernel_maps(struct machines *machines)
 643 {
 644         struct rb_node *next = rb_first(&machines->guests);
 645
 646         machine__destroy_kernel_maps(&machines->host);
 647
 648         while (next) {
 649                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 650
 651                 next = rb_next(&pos->rb_node);
 652                 rb_erase(&pos->rb_node, &machines->guests);
 653                 machine__delete(pos);
 654         }
 655 }
 656
 657 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 658 {
 659         struct machine *machine = machines__findnew(machines, pid);
 660
 661         if (machine == NULL)
 662                 return -1;
 663
 664         return machine__create_kernel_maps(machine);
 665 }
 666
 667 int machine__load_kallsyms(struct machine *machine, const char *filename,
 668                            enum map_type type, symbol_filter_t filter)
 669 {
 670         struct map *map = machine->vmlinux_maps[type];
 671         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
 672
 673         if (ret > 0) {
 674                 dso__set_loaded(map->dso, type);
 675                 /*
 676                  * Since /proc/kallsyms will have multiple sessions for the
 677                  * kernel, with modules between them, fixup the end of all
 678                  * sections.
 679                  */
 680                 __map_groups__fixup_end(&machine->kmaps, type);
 681         }
 682
 683         return ret;
 684 }
 685
 686 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 687                                symbol_filter_t filter)
 688 {
 689         struct map *map = machine->vmlinux_maps[type];
 690         int ret = dso__load_vmlinux_path(map->dso, map, filter);
 691
 692         if (ret > 0)
 693                 dso__set_loaded(map->dso, type);
 694
 695         return ret;
 696 }
 697
 698 static void map_groups__fixup_end(struct map_groups *mg)
 699 {
 700         int i;
 701         for (i = 0; i < MAP__NR_TYPES; ++i)
 702                 __map_groups__fixup_end(mg, i);
 703 }
 704
 705 static char *get_kernel_version(const char *root_dir)
 706 {
 707         char version[PATH_MAX];
 708         FILE *file;
 709         char *name, *tmp;
 710         const char *prefix = "Linux version ";
 711
 712         sprintf(version, "%s/proc/version", root_dir);
 713         file = fopen(version, "r");
 714         if (!file)
 715                 return NULL;
 716
 717         version[0] = '\0';
 718         tmp = fgets(version, sizeof(version), file);
 719         fclose(file);
 720
 721         name = strstr(version, prefix);
 722         if (!name)
 723                 return NULL;
 724         name += strlen(prefix);
 725         tmp = strchr(name, ' ');
 726         if (tmp)
 727                 *tmp = '\0';
 728
 729         return strdup(name);
 730 }
 731
 732 static int map_groups__set_modules_path_dir(struct map_groups *mg,
 733                                 const char *dir_name, int depth)
 734 {
 735         struct dirent *dent;
 736         DIR *dir = opendir(dir_name);
 737         int ret = 0;
 738
 739         if (!dir) {
 740                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
 741                 return -1;
 742         }
 743
 744         while ((dent = readdir(dir)) != NULL) {
 745                 char path[PATH_MAX];
 746                 struct stat st;
 747
 748                 /*sshfs might return bad dent->d_type, so we have to stat*/
 749                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
 750                 if (stat(path, &st))
 751                         continue;
 752
 753                 if (S_ISDIR(st.st_mode)) {
 754                         if (!strcmp(dent->d_name, ".") ||
 755                             !strcmp(dent->d_name, ".."))
 756                                 continue;
 757
 758                         /* Do not follow top-level source and build symlinks */
 759                         if (depth == 0) {
 760                                 if (!strcmp(dent->d_name, "source") ||
 761                                     !strcmp(dent->d_name, "build"))
 762                                         continue;
 763                         }
 764
 765                         ret = map_groups__set_modules_path_dir(mg, path,
 766                                                                depth + 1);
 767                         if (ret < 0)
 768                                 goto out;
 769                 } else {
 770                         char *dot = strrchr(dent->d_name, '.'),
 771                              dso_name[PATH_MAX];
 772                         struct map *map;
 773                         char *long_name;
 774
 775                         if (dot == NULL || strcmp(dot, ".ko"))
 776                                 continue;
 777                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
 778                                  (int)(dot - dent->d_name), dent->d_name);
 779
 780                         strxfrchar(dso_name, '-', '_');
 781                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
 782                                                        dso_name);
 783                         if (map == NULL)
 784                                 continue;
 785
 786                         long_name = strdup(path);
 787                         if (long_name == NULL) {
 788                                 ret = -1;
 789                                 goto out;
 790                         }
 791                         dso__set_long_name(map->dso, long_name, true);
 792                         dso__kernel_module_get_build_id(map->dso, "");
 793                 }
 794         }
 795
 796 out:
 797         closedir(dir);
 798         return ret;
 799 }
 800
 801 static int machine__set_modules_path(struct machine *machine)
 802 {
 803         char *version;
 804         char modules_path[PATH_MAX];
 805
 806         version = get_kernel_version(machine->root_dir);
 807         if (!version)
 808                 return -1;
 809
 810         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
 811                  machine->root_dir, version);
 812         free(version);
 813
 814         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
 815 }
 816
 817 static int machine__create_module(void *arg, const char *name, u64 start)
 818 {
 819         struct machine *machine = arg;
 820         struct map *map;
 821
 822         map = machine__new_module(machine, start, name);
 823         if (map == NULL)
 824                 return -1;
 825
 826         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 827
 828         return 0;
 829 }
 830
 831 static int machine__create_modules(struct machine *machine)
 832 {
 833         const char *modules;
 834         char path[PATH_MAX];
 835
 836         if (machine__is_default_guest(machine)) {
 837                 modules = symbol_conf.default_guest_modules;
 838         } else {
 839                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
 840                 modules = path;
 841         }
 842
 843         if (symbol__restricted_filename(modules, "/proc/modules"))
 844                 return -1;
 845
 846         if (modules__parse(modules, machine, machine__create_module))
 847                 return -1;
 848
 849         if (!machine__set_modules_path(machine))
 850                 return 0;
 851
 852         pr_debug("Problems setting modules path maps, continuing anyway...\n");
 853
 854         return 0;
 855 }
 856
 857 int machine__create_kernel_maps(struct machine *machine)
 858 {
 859         struct dso *kernel = machine__get_kernel(machine);
 860         const char *name;
 861         u64 addr = machine__get_kernel_start_addr(machine, &name);
 862         if (!addr)
 863                 return -1;
 864
 865         if (kernel == NULL ||
 866             __machine__create_kernel_maps(machine, kernel) < 0)
 867                 return -1;
 868
 869         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 870                 if (machine__is_host(machine))
 871                         pr_debug("Problems creating module maps, "
 872                                  "continuing anyway...\n");
 873                 else
 874                         pr_debug("Problems creating module maps for guest %d, "
 875                                  "continuing anyway...\n", machine->pid);
 876         }
 877
 878         /*
 879          * Now that we have all the maps created, just set the ->end of them:
 880          */
 881         map_groups__fixup_end(&machine->kmaps);
 882
 883         if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
 884                                              addr)) {
 885                 machine__destroy_kernel_maps(machine);
 886                 return -1;
 887         }
 888
 889         return 0;
 890 }
 891
 892 static void machine__set_kernel_mmap_len(struct machine *machine,
 893                                          union perf_event *event)
 894 {
 895         int i;
 896
 897         for (i = 0; i < MAP__NR_TYPES; i++) {
 898                 machine->vmlinux_maps[i]->start = event->mmap.start;
 899                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 900                                                    event->mmap.len);
 901                 /*
 902                  * Be a bit paranoid here, some perf.data file came with
 903                  * a zero sized synthesized MMAP event for the kernel.
 904                  */
 905                 if (machine->vmlinux_maps[i]->end == 0)
 906                         machine->vmlinux_maps[i]->end = ~0ULL;
 907         }
 908 }
 909
 910 static bool machine__uses_kcore(struct machine *machine)
 911 {
 912         struct dso *dso;
 913
 914         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 915                 if (dso__is_kcore(dso))
 916                         return true;
 917         }
 918
 919         return false;
 920 }
 921
 922 static int machine__process_kernel_mmap_event(struct machine *machine,
 923                                               union perf_event *event)
 924 {
 925         struct map *map;
 926         char kmmap_prefix[PATH_MAX];
 927         enum dso_kernel_type kernel_type;
 928         bool is_kernel_mmap;
 929
 930         /* If we have maps from kcore then we do not need or want any others */
 931         if (machine__uses_kcore(machine))
 932                 return 0;
 933
 934         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 935         if (machine__is_host(machine))
 936                 kernel_type = DSO_TYPE_KERNEL;
 937         else
 938                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 939
 940         is_kernel_mmap = memcmp(event->mmap.filename,
 941                                 kmmap_prefix,
 942                                 strlen(kmmap_prefix) - 1) == 0;
 943         if (event->mmap.filename[0] == '/' ||
 944             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 945
 946                 char short_module_name[1024];
 947                 char *name, *dot;
 948
 949                 if (event->mmap.filename[0] == '/') {
 950                         name = strrchr(event->mmap.filename, '/');
 951                         if (name == NULL)
 952                                 goto out_problem;
 953
 954                         ++name; /* skip / */
 955                         dot = strrchr(name, '.');
 956                         if (dot == NULL)
 957                                 goto out_problem;
 958                         snprintf(short_module_name, sizeof(short_module_name),
 959                                         "[%.*s]", (int)(dot - name), name);
 960                         strxfrchar(short_module_name, '-', '_');
 961                 } else
 962                         strcpy(short_module_name, event->mmap.filename);
 963
 964                 map = machine__new_module(machine, event->mmap.start,
 965                                           event->mmap.filename);
 966                 if (map == NULL)
 967                         goto out_problem;
 968
 969                 name = strdup(short_module_name);
 970                 if (name == NULL)
 971                         goto out_problem;
 972
 973                 dso__set_short_name(map->dso, name, true);
 974                 map->end = map->start + event->mmap.len;
 975         } else if (is_kernel_mmap) {
 976                 const char *symbol_name = (event->mmap.filename +
 977                                 strlen(kmmap_prefix));
 978                 /*
 979                  * Should be there already, from the build-id table in
 980                  * the header.
 981                  */
 982                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 983                                                      kmmap_prefix);
 984                 if (kernel == NULL)
 985                         goto out_problem;
 986
 987                 kernel->kernel = kernel_type;
 988                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 989                         goto out_problem;
 990
 991                 machine__set_kernel_mmap_len(machine, event);
 992
 993                 /*
 994                  * Avoid using a zero address (kptr_restrict) for the ref reloc
 995                  * symbol. Effectively having zero here means that at record
 996                  * time /proc/sys/kernel/kptr_restrict was non zero.
 997                  */
 998                 if (event->mmap.pgoff != 0) {
 999                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
1000                                                          symbol_name,
1001                                                          event->mmap.pgoff);
1002                 }
1003
1004                 if (machine__is_default_guest(machine)) {
1005                         /*
1006                          * preload dso of guest kernel and modules
1007                          */
1008                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1009                                   NULL);
1010                 }
1011         }
1012         return 0;
1013 out_problem:
1014         return -1;
1015 }
1016
1017 int machine__process_mmap2_event(struct machine *machine,
1018                                  union perf_event *event,
1019                                  struct perf_sample *sample __maybe_unused)
1020 {
1021         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1022         struct thread *thread;
1023         struct map *map;
1024         enum map_type type;
1025         int ret = 0;
1026
1027         if (dump_trace)
1028                 perf_event__fprintf_mmap2(event, stdout);
1029
1030         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1031             cpumode == PERF_RECORD_MISC_KERNEL) {
1032                 ret = machine__process_kernel_mmap_event(machine, event);
1033                 if (ret < 0)
1034                         goto out_problem;
1035                 return 0;
1036         }
1037
1038         thread = machine__findnew_thread(machine, event->mmap2.pid,
1039                                         event->mmap2.tid);
1040         if (thread == NULL)
1041                 goto out_problem;
1042
1043         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1044                 type = MAP__VARIABLE;
1045         else
1046                 type = MAP__FUNCTION;
1047
1048         map = map__new(&machine->user_dsos, event->mmap2.start,
1049                         event->mmap2.len, event->mmap2.pgoff,
1050                         event->mmap2.pid, event->mmap2.maj,
1051                         event->mmap2.min, event->mmap2.ino,
1052                         event->mmap2.ino_generation,
1053                         event->mmap2.prot,
1054                         event->mmap2.flags,
1055                         event->mmap2.filename, type);
1056
1057         if (map == NULL)
1058                 goto out_problem;
1059
1060         thread__insert_map(thread, map);
1061         return 0;
1062
1063 out_problem:
1064         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1065         return 0;
1066 }
1067
1068 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1069                                 struct perf_sample *sample __maybe_unused)
1070 {
1071         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1072         struct thread *thread;
1073         struct map *map;
1074         enum map_type type;
1075         int ret = 0;
1076
1077         if (dump_trace)
1078                 perf_event__fprintf_mmap(event, stdout);
1079
1080         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1081             cpumode == PERF_RECORD_MISC_KERNEL) {
1082                 ret = machine__process_kernel_mmap_event(machine, event);
1083                 if (ret < 0)
1084                         goto out_problem;
1085                 return 0;
1086         }
1087
1088         thread = machine__findnew_thread(machine, event->mmap.pid,
1089                                          event->mmap.tid);
1090         if (thread == NULL)
1091                 goto out_problem;
1092
1093         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1094                 type = MAP__VARIABLE;
1095         else
1096                 type = MAP__FUNCTION;
1097
1098         map = map__new(&machine->user_dsos, event->mmap.start,
1099                         event->mmap.len, event->mmap.pgoff,
1100                         event->mmap.pid, 0, 0, 0, 0, 0, 0,
1101                         event->mmap.filename,
1102                         type);
1103
1104         if (map == NULL)
1105                 goto out_problem;
1106
1107         thread__insert_map(thread, map);
1108         return 0;
1109
1110 out_problem:
1111         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1112         return 0;
1113 }
1114
1115 static void machine__remove_thread(struct machine *machine, struct thread *th)
1116 {
1117         machine->last_match = NULL;
1118         rb_erase(&th->rb_node, &machine->threads);
1119         /*
1120          * We may have references to this thread, for instance in some hist_entry
1121          * instances, so just move them to a separate list.
1122          */
1123         list_add_tail(&th->node, &machine->dead_threads);
1124 }
1125
1126 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1127                                 struct perf_sample *sample)
1128 {
1129         struct thread *thread = machine__find_thread(machine,
1130                                                      event->fork.pid,
1131                                                      event->fork.tid);
1132         struct thread *parent = machine__findnew_thread(machine,
1133                                                         event->fork.ppid,
1134                                                         event->fork.ptid);
1135
1136         /* if a thread currently exists for the thread id remove it */
1137         if (thread != NULL)
1138                 machine__remove_thread(machine, thread);
1139
1140         thread = machine__findnew_thread(machine, event->fork.pid,
1141                                          event->fork.tid);
1142         if (dump_trace)
1143                 perf_event__fprintf_task(event, stdout);
1144
1145         if (thread == NULL || parent == NULL ||
1146             thread__fork(thread, parent, sample->time) < 0) {
1147                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1148                 return -1;
1149         }
1150
1151         return 0;
1152 }
1153
1154 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1155                                 struct perf_sample *sample __maybe_unused)
1156 {
1157         struct thread *thread = machine__find_thread(machine,
1158                                                      event->fork.pid,
1159                                                      event->fork.tid);
1160
1161         if (dump_trace)
1162                 perf_event__fprintf_task(event, stdout);
1163
1164         if (thread != NULL)
1165                 thread__exited(thread);
1166
1167         return 0;
1168 }
1169
1170 int machine__process_event(struct machine *machine, union perf_event *event,
1171                            struct perf_sample *sample)
1172 {
1173         int ret;
1174
1175         switch (event->header.type) {
1176         case PERF_RECORD_COMM:
1177                 ret = machine__process_comm_event(machine, event, sample); break;
1178         case PERF_RECORD_MMAP:
1179                 ret = machine__process_mmap_event(machine, event, sample); break;
1180         case PERF_RECORD_MMAP2:
1181                 ret = machine__process_mmap2_event(machine, event, sample); break;
1182         case PERF_RECORD_FORK:
1183                 ret = machine__process_fork_event(machine, event, sample); break;
1184         case PERF_RECORD_EXIT:
1185                 ret = machine__process_exit_event(machine, event, sample); break;
1186         case PERF_RECORD_LOST:
1187                 ret = machine__process_lost_event(machine, event, sample); break;
1188         default:
1189                 ret = -1;
1190                 break;
1191         }
1192
1193         return ret;
1194 }
1195
1196 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1197 {
1198         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1199                 return 1;
1200         return 0;
1201 }
1202
1203 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1204                             struct addr_map_symbol *ams,
1205                             u64 ip)
1206 {
1207         struct addr_location al;
1208
1209         memset(&al, 0, sizeof(al));
1210         /*
1211          * We cannot use the header.misc hint to determine whether a
1212          * branch stack address is user, kernel, guest, hypervisor.
1213          * Branches may straddle the kernel/user/hypervisor boundaries.
1214          * Thus, we have to try consecutively until we find a match
1215          * or else, the symbol is unknown
1216          */
1217         thread__find_cpumode_addr_location(thread, machine, MAP__FUNCTION, ip, &al);
1218
1219         ams->addr = ip;
1220         ams->al_addr = al.addr;
1221         ams->sym = al.sym;
1222         ams->map = al.map;
1223 }
1224
1225 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1226                              u8 m, struct addr_map_symbol *ams, u64 addr)
1227 {
1228         struct addr_location al;
1229
1230         memset(&al, 0, sizeof(al));
1231
1232         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1233                                    &al);
1234         ams->addr = addr;
1235         ams->al_addr = al.addr;
1236         ams->sym = al.sym;
1237         ams->map = al.map;
1238 }
1239
1240 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1241                                      struct addr_location *al)
1242 {
1243         struct mem_info *mi = zalloc(sizeof(*mi));
1244
1245         if (!mi)
1246                 return NULL;
1247
1248         ip__resolve_ams(al->machine, al->thread, &mi->iaddr, sample->ip);
1249         ip__resolve_data(al->machine, al->thread, al->cpumode,
1250                          &mi->daddr, sample->addr);
1251         mi->data_src.val = sample->data_src;
1252
1253         return mi;
1254 }
1255
1256 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1257                                            struct addr_location *al)
1258 {
1259         unsigned int i;
1260         const struct branch_stack *bs = sample->branch_stack;
1261         struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1262
1263         if (!bi)
1264                 return NULL;
1265
1266         for (i = 0; i < bs->nr; i++) {
1267                 ip__resolve_ams(al->machine, al->thread, &bi[i].to, bs->entries[i].to);
1268                 ip__resolve_ams(al->machine, al->thread, &bi[i].from, bs->entries[i].from);
1269                 bi[i].flags = bs->entries[i].flags;
1270         }
1271         return bi;
1272 }
1273
1274 static int machine__resolve_callchain_sample(struct machine *machine,
1275                                              struct thread *thread,
1276                                              struct ip_callchain *chain,
1277                                              struct symbol **parent,
1278                                              struct addr_location *root_al,
1279                                              int max_stack)
1280 {
1281         u8 cpumode = PERF_RECORD_MISC_USER;
1282         int chain_nr = min(max_stack, (int)chain->nr);
1283         int i;
1284         int err;
1285
1286         callchain_cursor_reset(&callchain_cursor);
1287
1288         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1289                 pr_warning("corrupted callchain. skipping...\n");
1290                 return 0;
1291         }
1292
1293         for (i = 0; i < chain_nr; i++) {
1294                 u64 ip;
1295                 struct addr_location al;
1296
1297                 if (callchain_param.order == ORDER_CALLEE)
1298                         ip = chain->ips[i];
1299                 else
1300                         ip = chain->ips[chain->nr - i - 1];
1301
1302                 if (ip >= PERF_CONTEXT_MAX) {
1303                         switch (ip) {
1304                         case PERF_CONTEXT_HV:
1305                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1306                                 break;
1307                         case PERF_CONTEXT_KERNEL:
1308                                 cpumode = PERF_RECORD_MISC_KERNEL;
1309                                 break;
1310                         case PERF_CONTEXT_USER:
1311                                 cpumode = PERF_RECORD_MISC_USER;
1312                                 break;
1313                         default:
1314                                 pr_debug("invalid callchain context: "
1315                                          "%"PRId64"\n", (s64) ip);
1316                                 /*
1317                                  * It seems the callchain is corrupted.
1318                                  * Discard all.
1319                                  */
1320                                 callchain_cursor_reset(&callchain_cursor);
1321                                 return 0;
1322                         }
1323                         continue;
1324                 }
1325
1326                 al.filtered = 0;
1327                 thread__find_addr_location(thread, machine, cpumode,
1328                                            MAP__FUNCTION, ip, &al);
1329                 if (al.sym != NULL) {
1330                         if (sort__has_parent && !*parent &&
1331                             symbol__match_regex(al.sym, &parent_regex))
1332                                 *parent = al.sym;
1333                         else if (have_ignore_callees && root_al &&
1334                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1335                                 /* Treat this symbol as the root,
1336                                    forgetting its callees. */
1337                                 *root_al = al;
1338                                 callchain_cursor_reset(&callchain_cursor);
1339                         }
1340                 }
1341
1342                 err = callchain_cursor_append(&callchain_cursor,
1343                                               ip, al.map, al.sym);
1344                 if (err)
1345                         return err;
1346         }
1347
1348         return 0;
1349 }
1350
1351 static int unwind_entry(struct unwind_entry *entry, void *arg)
1352 {
1353         struct callchain_cursor *cursor = arg;
1354         return callchain_cursor_append(cursor, entry->ip,
1355                                        entry->map, entry->sym);
1356 }
1357
1358 int machine__resolve_callchain(struct machine *machine,
1359                                struct perf_evsel *evsel,
1360                                struct thread *thread,
1361                                struct perf_sample *sample,
1362                                struct symbol **parent,
1363                                struct addr_location *root_al,
1364                                int max_stack)
1365 {
1366         int ret;
1367
1368         ret = machine__resolve_callchain_sample(machine, thread,
1369                                                 sample->callchain, parent,
1370                                                 root_al, max_stack);
1371         if (ret)
1372                 return ret;
1373
1374         /* Can we do dwarf post unwind? */
1375         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1376               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1377                 return 0;
1378
1379         /* Bail out if nothing was captured. */
1380         if ((!sample->user_regs.regs) ||
1381             (!sample->user_stack.size))
1382                 return 0;
1383
1384         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1385                                    thread, sample, max_stack);
1386
1387 }
1388
1389 int machine__for_each_thread(struct machine *machine,
1390                              int (*fn)(struct thread *thread, void *p),
1391                              void *priv)
1392 {
1393         struct rb_node *nd;
1394         struct thread *thread;
1395         int rc = 0;
1396
1397         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1398                 thread = rb_entry(nd, struct thread, rb_node);
1399                 rc = fn(thread, priv);
1400                 if (rc != 0)
1401                         return rc;
1402         }
1403
1404         list_for_each_entry(thread, &machine->dead_threads, node) {
1405                 rc = fn(thread, priv);
1406                 if (rc != 0)
1407                         return rc;
1408         }
1409         return rc;
1410 }
1411
1412 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1413                                   struct target *target, struct thread_map *threads,
1414                                   perf_event__handler_t process, bool data_mmap)
1415 {
1416         if (target__has_task(target))
1417                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1418         else if (target__has_cpu(target))
1419                 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1420         /* command specified */
1421         return 0;
1422 }