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 int symbol__in_kernel(void *arg, const char *name,
 500                              char type __maybe_unused, u64 start)
 501 {
 502         struct process_args *args = arg;
 503
 504         if (strchr(name, '['))
 505                 return 0;
 506
 507         args->start = start;
 508         return 1;
 509 }
 510
 511 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 512                                            size_t bufsz)
 513 {
 514         if (machine__is_default_guest(machine))
 515                 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
 516         else
 517                 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
 518 }
 519
 520 /* Figure out the start address of kernel map from /proc/kallsyms */
 521 static u64 machine__get_kernel_start_addr(struct machine *machine)
 522 {
 523         char filename[PATH_MAX];
 524         struct process_args args;
 525
 526         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 527
 528         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 529                 return 0;
 530
 531         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
 532                 return 0;
 533
 534         return args.start;
 535 }
 536
 537 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 538 {
 539         enum map_type type;
 540         u64 start = machine__get_kernel_start_addr(machine);
 541
 542         for (type = 0; type < MAP__NR_TYPES; ++type) {
 543                 struct kmap *kmap;
 544
 545                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 546                 if (machine->vmlinux_maps[type] == NULL)
 547                         return -1;
 548
 549                 machine->vmlinux_maps[type]->map_ip =
 550                         machine->vmlinux_maps[type]->unmap_ip =
 551                                 identity__map_ip;
 552                 kmap = map__kmap(machine->vmlinux_maps[type]);
 553                 kmap->kmaps = &machine->kmaps;
 554                 map_groups__insert(&machine->kmaps,
 555                                    machine->vmlinux_maps[type]);
 556         }
 557
 558         return 0;
 559 }
 560
 561 void machine__destroy_kernel_maps(struct machine *machine)
 562 {
 563         enum map_type type;
 564
 565         for (type = 0; type < MAP__NR_TYPES; ++type) {
 566                 struct kmap *kmap;
 567
 568                 if (machine->vmlinux_maps[type] == NULL)
 569                         continue;
 570
 571                 kmap = map__kmap(machine->vmlinux_maps[type]);
 572                 map_groups__remove(&machine->kmaps,
 573                                    machine->vmlinux_maps[type]);
 574                 if (kmap->ref_reloc_sym) {
 575                         /*
 576                          * ref_reloc_sym is shared among all maps, so free just
 577                          * on one of them.
 578                          */
 579                         if (type == MAP__FUNCTION) {
 580                                 zfree((char **)&kmap->ref_reloc_sym->name);
 581                                 zfree(&kmap->ref_reloc_sym);
 582                         } else
 583                                 kmap->ref_reloc_sym = NULL;
 584                 }
 585
 586                 map__delete(machine->vmlinux_maps[type]);
 587                 machine->vmlinux_maps[type] = NULL;
 588         }
 589 }
 590
 591 int machines__create_guest_kernel_maps(struct machines *machines)
 592 {
 593         int ret = 0;
 594         struct dirent **namelist = NULL;
 595         int i, items = 0;
 596         char path[PATH_MAX];
 597         pid_t pid;
 598         char *endp;
 599
 600         if (symbol_conf.default_guest_vmlinux_name ||
 601             symbol_conf.default_guest_modules ||
 602             symbol_conf.default_guest_kallsyms) {
 603                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 604         }
 605
 606         if (symbol_conf.guestmount) {
 607                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 608                 if (items <= 0)
 609                         return -ENOENT;
 610                 for (i = 0; i < items; i++) {
 611                         if (!isdigit(namelist[i]->d_name[0])) {
 612                                 /* Filter out . and .. */
 613                                 continue;
 614                         }
 615                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 616                         if ((*endp != '\0') ||
 617                             (endp == namelist[i]->d_name) ||
 618                             (errno == ERANGE)) {
 619                                 pr_debug("invalid directory (%s). Skipping.\n",
 620                                          namelist[i]->d_name);
 621                                 continue;
 622                         }
 623                         sprintf(path, "%s/%s/proc/kallsyms",
 624                                 symbol_conf.guestmount,
 625                                 namelist[i]->d_name);
 626                         ret = access(path, R_OK);
 627                         if (ret) {
 628                                 pr_debug("Can't access file %s\n", path);
 629                                 goto failure;
 630                         }
 631                         machines__create_kernel_maps(machines, pid);
 632                 }
 633 failure:
 634                 free(namelist);
 635         }
 636
 637         return ret;
 638 }
 639
 640 void machines__destroy_kernel_maps(struct machines *machines)
 641 {
 642         struct rb_node *next = rb_first(&machines->guests);
 643
 644         machine__destroy_kernel_maps(&machines->host);
 645
 646         while (next) {
 647                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 648
 649                 next = rb_next(&pos->rb_node);
 650                 rb_erase(&pos->rb_node, &machines->guests);
 651                 machine__delete(pos);
 652         }
 653 }
 654
 655 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 656 {
 657         struct machine *machine = machines__findnew(machines, pid);
 658
 659         if (machine == NULL)
 660                 return -1;
 661
 662         return machine__create_kernel_maps(machine);
 663 }
 664
 665 int machine__load_kallsyms(struct machine *machine, const char *filename,
 666                            enum map_type type, symbol_filter_t filter)
 667 {
 668         struct map *map = machine->vmlinux_maps[type];
 669         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
 670
 671         if (ret > 0) {
 672                 dso__set_loaded(map->dso, type);
 673                 /*
 674                  * Since /proc/kallsyms will have multiple sessions for the
 675                  * kernel, with modules between them, fixup the end of all
 676                  * sections.
 677                  */
 678                 __map_groups__fixup_end(&machine->kmaps, type);
 679         }
 680
 681         return ret;
 682 }
 683
 684 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 685                                symbol_filter_t filter)
 686 {
 687         struct map *map = machine->vmlinux_maps[type];
 688         int ret = dso__load_vmlinux_path(map->dso, map, filter);
 689
 690         if (ret > 0)
 691                 dso__set_loaded(map->dso, type);
 692
 693         return ret;
 694 }
 695
 696 static void map_groups__fixup_end(struct map_groups *mg)
 697 {
 698         int i;
 699         for (i = 0; i < MAP__NR_TYPES; ++i)
 700                 __map_groups__fixup_end(mg, i);
 701 }
 702
 703 static char *get_kernel_version(const char *root_dir)
 704 {
 705         char version[PATH_MAX];
 706         FILE *file;
 707         char *name, *tmp;
 708         const char *prefix = "Linux version ";
 709
 710         sprintf(version, "%s/proc/version", root_dir);
 711         file = fopen(version, "r");
 712         if (!file)
 713                 return NULL;
 714
 715         version[0] = '\0';
 716         tmp = fgets(version, sizeof(version), file);
 717         fclose(file);
 718
 719         name = strstr(version, prefix);
 720         if (!name)
 721                 return NULL;
 722         name += strlen(prefix);
 723         tmp = strchr(name, ' ');
 724         if (tmp)
 725                 *tmp = '\0';
 726
 727         return strdup(name);
 728 }
 729
 730 static int map_groups__set_modules_path_dir(struct map_groups *mg,
 731                                 const char *dir_name, int depth)
 732 {
 733         struct dirent *dent;
 734         DIR *dir = opendir(dir_name);
 735         int ret = 0;
 736
 737         if (!dir) {
 738                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
 739                 return -1;
 740         }
 741
 742         while ((dent = readdir(dir)) != NULL) {
 743                 char path[PATH_MAX];
 744                 struct stat st;
 745
 746                 /*sshfs might return bad dent->d_type, so we have to stat*/
 747                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
 748                 if (stat(path, &st))
 749                         continue;
 750
 751                 if (S_ISDIR(st.st_mode)) {
 752                         if (!strcmp(dent->d_name, ".") ||
 753                             !strcmp(dent->d_name, ".."))
 754                                 continue;
 755
 756                         /* Do not follow top-level source and build symlinks */
 757                         if (depth == 0) {
 758                                 if (!strcmp(dent->d_name, "source") ||
 759                                     !strcmp(dent->d_name, "build"))
 760                                         continue;
 761                         }
 762
 763                         ret = map_groups__set_modules_path_dir(mg, path,
 764                                                                depth + 1);
 765                         if (ret < 0)
 766                                 goto out;
 767                 } else {
 768                         char *dot = strrchr(dent->d_name, '.'),
 769                              dso_name[PATH_MAX];
 770                         struct map *map;
 771                         char *long_name;
 772
 773                         if (dot == NULL || strcmp(dot, ".ko"))
 774                                 continue;
 775                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
 776                                  (int)(dot - dent->d_name), dent->d_name);
 777
 778                         strxfrchar(dso_name, '-', '_');
 779                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
 780                                                        dso_name);
 781                         if (map == NULL)
 782                                 continue;
 783
 784                         long_name = strdup(path);
 785                         if (long_name == NULL) {
 786                                 ret = -1;
 787                                 goto out;
 788                         }
 789                         dso__set_long_name(map->dso, long_name, true);
 790                         dso__kernel_module_get_build_id(map->dso, "");
 791                 }
 792         }
 793
 794 out:
 795         closedir(dir);
 796         return ret;
 797 }
 798
 799 static int machine__set_modules_path(struct machine *machine)
 800 {
 801         char *version;
 802         char modules_path[PATH_MAX];
 803
 804         version = get_kernel_version(machine->root_dir);
 805         if (!version)
 806                 return -1;
 807
 808         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
 809                  machine->root_dir, version);
 810         free(version);
 811
 812         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
 813 }
 814
 815 static int machine__create_module(void *arg, const char *name, u64 start)
 816 {
 817         struct machine *machine = arg;
 818         struct map *map;
 819
 820         map = machine__new_module(machine, start, name);
 821         if (map == NULL)
 822                 return -1;
 823
 824         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 825
 826         return 0;
 827 }
 828
 829 static int machine__create_modules(struct machine *machine)
 830 {
 831         const char *modules;
 832         char path[PATH_MAX];
 833
 834         if (machine__is_default_guest(machine)) {
 835                 modules = symbol_conf.default_guest_modules;
 836         } else {
 837                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
 838                 modules = path;
 839         }
 840
 841         if (symbol__restricted_filename(modules, "/proc/modules"))
 842                 return -1;
 843
 844         if (modules__parse(modules, machine, machine__create_module))
 845                 return -1;
 846
 847         if (!machine__set_modules_path(machine))
 848                 return 0;
 849
 850         pr_debug("Problems setting modules path maps, continuing anyway...\n");
 851
 852         return 0;
 853 }
 854
 855 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
 856
 857 int machine__create_kernel_maps(struct machine *machine)
 858 {
 859         struct dso *kernel = machine__get_kernel(machine);
 860         char filename[PATH_MAX];
 861         const char *name;
 862         u64 addr = 0;
 863         int i;
 864
 865         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 866
 867         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 868                 addr = kallsyms__get_function_start(filename, name);
 869                 if (addr)
 870                         break;
 871         }
 872         if (!addr)
 873                 return -1;
 874
 875         if (kernel == NULL ||
 876             __machine__create_kernel_maps(machine, kernel) < 0)
 877                 return -1;
 878
 879         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 880                 if (machine__is_host(machine))
 881                         pr_debug("Problems creating module maps, "
 882                                  "continuing anyway...\n");
 883                 else
 884                         pr_debug("Problems creating module maps for guest %d, "
 885                                  "continuing anyway...\n", machine->pid);
 886         }
 887
 888         /*
 889          * Now that we have all the maps created, just set the ->end of them:
 890          */
 891         map_groups__fixup_end(&machine->kmaps);
 892
 893         if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
 894                                              addr)) {
 895                 machine__destroy_kernel_maps(machine);
 896                 return -1;
 897         }
 898
 899         return 0;
 900 }
 901
 902 static void machine__set_kernel_mmap_len(struct machine *machine,
 903                                          union perf_event *event)
 904 {
 905         int i;
 906
 907         for (i = 0; i < MAP__NR_TYPES; i++) {
 908                 machine->vmlinux_maps[i]->start = event->mmap.start;
 909                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 910                                                    event->mmap.len);
 911                 /*
 912                  * Be a bit paranoid here, some perf.data file came with
 913                  * a zero sized synthesized MMAP event for the kernel.
 914                  */
 915                 if (machine->vmlinux_maps[i]->end == 0)
 916                         machine->vmlinux_maps[i]->end = ~0ULL;
 917         }
 918 }
 919
 920 static bool machine__uses_kcore(struct machine *machine)
 921 {
 922         struct dso *dso;
 923
 924         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 925                 if (dso__is_kcore(dso))
 926                         return true;
 927         }
 928
 929         return false;
 930 }
 931
 932 static int machine__process_kernel_mmap_event(struct machine *machine,
 933                                               union perf_event *event)
 934 {
 935         struct map *map;
 936         char kmmap_prefix[PATH_MAX];
 937         enum dso_kernel_type kernel_type;
 938         bool is_kernel_mmap;
 939
 940         /* If we have maps from kcore then we do not need or want any others */
 941         if (machine__uses_kcore(machine))
 942                 return 0;
 943
 944         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 945         if (machine__is_host(machine))
 946                 kernel_type = DSO_TYPE_KERNEL;
 947         else
 948                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 949
 950         is_kernel_mmap = memcmp(event->mmap.filename,
 951                                 kmmap_prefix,
 952                                 strlen(kmmap_prefix) - 1) == 0;
 953         if (event->mmap.filename[0] == '/' ||
 954             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 955
 956                 char short_module_name[1024];
 957                 char *name, *dot;
 958
 959                 if (event->mmap.filename[0] == '/') {
 960                         name = strrchr(event->mmap.filename, '/');
 961                         if (name == NULL)
 962                                 goto out_problem;
 963
 964                         ++name; /* skip / */
 965                         dot = strrchr(name, '.');
 966                         if (dot == NULL)
 967                                 goto out_problem;
 968                         snprintf(short_module_name, sizeof(short_module_name),
 969                                         "[%.*s]", (int)(dot - name), name);
 970                         strxfrchar(short_module_name, '-', '_');
 971                 } else
 972                         strcpy(short_module_name, event->mmap.filename);
 973
 974                 map = machine__new_module(machine, event->mmap.start,
 975                                           event->mmap.filename);
 976                 if (map == NULL)
 977                         goto out_problem;
 978
 979                 name = strdup(short_module_name);
 980                 if (name == NULL)
 981                         goto out_problem;
 982
 983                 dso__set_short_name(map->dso, name, true);
 984                 map->end = map->start + event->mmap.len;
 985         } else if (is_kernel_mmap) {
 986                 const char *symbol_name = (event->mmap.filename +
 987                                 strlen(kmmap_prefix));
 988                 /*
 989                  * Should be there already, from the build-id table in
 990                  * the header.
 991                  */
 992                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 993                                                      kmmap_prefix);
 994                 if (kernel == NULL)
 995                         goto out_problem;
 996
 997                 kernel->kernel = kernel_type;
 998                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 999                         goto out_problem;
1000
1001                 machine__set_kernel_mmap_len(machine, event);
1002
1003                 /*
1004                  * Avoid using a zero address (kptr_restrict) for the ref reloc
1005                  * symbol. Effectively having zero here means that at record
1006                  * time /proc/sys/kernel/kptr_restrict was non zero.
1007                  */
1008                 if (event->mmap.pgoff != 0) {
1009                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
1010                                                          symbol_name,
1011                                                          event->mmap.pgoff);
1012                 }
1013
1014                 if (machine__is_default_guest(machine)) {
1015                         /*
1016                          * preload dso of guest kernel and modules
1017                          */
1018                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1019                                   NULL);
1020                 }
1021         }
1022         return 0;
1023 out_problem:
1024         return -1;
1025 }
1026
1027 int machine__process_mmap2_event(struct machine *machine,
1028                                  union perf_event *event,
1029                                  struct perf_sample *sample __maybe_unused)
1030 {
1031         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1032         struct thread *thread;
1033         struct map *map;
1034         enum map_type type;
1035         int ret = 0;
1036
1037         if (dump_trace)
1038                 perf_event__fprintf_mmap2(event, stdout);
1039
1040         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1041             cpumode == PERF_RECORD_MISC_KERNEL) {
1042                 ret = machine__process_kernel_mmap_event(machine, event);
1043                 if (ret < 0)
1044                         goto out_problem;
1045                 return 0;
1046         }
1047
1048         thread = machine__findnew_thread(machine, event->mmap2.pid,
1049                                         event->mmap2.tid);
1050         if (thread == NULL)
1051                 goto out_problem;
1052
1053         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1054                 type = MAP__VARIABLE;
1055         else
1056                 type = MAP__FUNCTION;
1057
1058         map = map__new(&machine->user_dsos, event->mmap2.start,
1059                         event->mmap2.len, event->mmap2.pgoff,
1060                         event->mmap2.pid, event->mmap2.maj,
1061                         event->mmap2.min, event->mmap2.ino,
1062                         event->mmap2.ino_generation,
1063                         event->mmap2.prot,
1064                         event->mmap2.flags,
1065                         event->mmap2.filename, type);
1066
1067         if (map == NULL)
1068                 goto out_problem;
1069
1070         thread__insert_map(thread, map);
1071         return 0;
1072
1073 out_problem:
1074         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1075         return 0;
1076 }
1077
1078 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1079                                 struct perf_sample *sample __maybe_unused)
1080 {
1081         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1082         struct thread *thread;
1083         struct map *map;
1084         enum map_type type;
1085         int ret = 0;
1086
1087         if (dump_trace)
1088                 perf_event__fprintf_mmap(event, stdout);
1089
1090         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1091             cpumode == PERF_RECORD_MISC_KERNEL) {
1092                 ret = machine__process_kernel_mmap_event(machine, event);
1093                 if (ret < 0)
1094                         goto out_problem;
1095                 return 0;
1096         }
1097
1098         thread = machine__findnew_thread(machine, event->mmap.pid,
1099                                          event->mmap.tid);
1100         if (thread == NULL)
1101                 goto out_problem;
1102
1103         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1104                 type = MAP__VARIABLE;
1105         else
1106                 type = MAP__FUNCTION;
1107
1108         map = map__new(&machine->user_dsos, event->mmap.start,
1109                         event->mmap.len, event->mmap.pgoff,
1110                         event->mmap.pid, 0, 0, 0, 0, 0, 0,
1111                         event->mmap.filename,
1112                         type);
1113
1114         if (map == NULL)
1115                 goto out_problem;
1116
1117         thread__insert_map(thread, map);
1118         return 0;
1119
1120 out_problem:
1121         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1122         return 0;
1123 }
1124
1125 static void machine__remove_thread(struct machine *machine, struct thread *th)
1126 {
1127         machine->last_match = NULL;
1128         rb_erase(&th->rb_node, &machine->threads);
1129         /*
1130          * We may have references to this thread, for instance in some hist_entry
1131          * instances, so just move them to a separate list.
1132          */
1133         list_add_tail(&th->node, &machine->dead_threads);
1134 }
1135
1136 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1137                                 struct perf_sample *sample)
1138 {
1139         struct thread *thread = machine__find_thread(machine,
1140                                                      event->fork.pid,
1141                                                      event->fork.tid);
1142         struct thread *parent = machine__findnew_thread(machine,
1143                                                         event->fork.ppid,
1144                                                         event->fork.ptid);
1145
1146         /* if a thread currently exists for the thread id remove it */
1147         if (thread != NULL)
1148                 machine__remove_thread(machine, thread);
1149
1150         thread = machine__findnew_thread(machine, event->fork.pid,
1151                                          event->fork.tid);
1152         if (dump_trace)
1153                 perf_event__fprintf_task(event, stdout);
1154
1155         if (thread == NULL || parent == NULL ||
1156             thread__fork(thread, parent, sample->time) < 0) {
1157                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1158                 return -1;
1159         }
1160
1161         return 0;
1162 }
1163
1164 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1165                                 struct perf_sample *sample __maybe_unused)
1166 {
1167         struct thread *thread = machine__find_thread(machine,
1168                                                      event->fork.pid,
1169                                                      event->fork.tid);
1170
1171         if (dump_trace)
1172                 perf_event__fprintf_task(event, stdout);
1173
1174         if (thread != NULL)
1175                 thread__exited(thread);
1176
1177         return 0;
1178 }
1179
1180 int machine__process_event(struct machine *machine, union perf_event *event,
1181                            struct perf_sample *sample)
1182 {
1183         int ret;
1184
1185         switch (event->header.type) {
1186         case PERF_RECORD_COMM:
1187                 ret = machine__process_comm_event(machine, event, sample); break;
1188         case PERF_RECORD_MMAP:
1189                 ret = machine__process_mmap_event(machine, event, sample); break;
1190         case PERF_RECORD_MMAP2:
1191                 ret = machine__process_mmap2_event(machine, event, sample); break;
1192         case PERF_RECORD_FORK:
1193                 ret = machine__process_fork_event(machine, event, sample); break;
1194         case PERF_RECORD_EXIT:
1195                 ret = machine__process_exit_event(machine, event, sample); break;
1196         case PERF_RECORD_LOST:
1197                 ret = machine__process_lost_event(machine, event, sample); break;
1198         default:
1199                 ret = -1;
1200                 break;
1201         }
1202
1203         return ret;
1204 }
1205
1206 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1207 {
1208         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1209                 return 1;
1210         return 0;
1211 }
1212
1213 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1214                             struct addr_map_symbol *ams,
1215                             u64 ip)
1216 {
1217         struct addr_location al;
1218
1219         memset(&al, 0, sizeof(al));
1220         /*
1221          * We cannot use the header.misc hint to determine whether a
1222          * branch stack address is user, kernel, guest, hypervisor.
1223          * Branches may straddle the kernel/user/hypervisor boundaries.
1224          * Thus, we have to try consecutively until we find a match
1225          * or else, the symbol is unknown
1226          */
1227         thread__find_cpumode_addr_location(thread, machine, MAP__FUNCTION, ip, &al);
1228
1229         ams->addr = ip;
1230         ams->al_addr = al.addr;
1231         ams->sym = al.sym;
1232         ams->map = al.map;
1233 }
1234
1235 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1236                              u8 m, struct addr_map_symbol *ams, u64 addr)
1237 {
1238         struct addr_location al;
1239
1240         memset(&al, 0, sizeof(al));
1241
1242         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1243                                    &al);
1244         ams->addr = addr;
1245         ams->al_addr = al.addr;
1246         ams->sym = al.sym;
1247         ams->map = al.map;
1248 }
1249
1250 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1251                                      struct addr_location *al)
1252 {
1253         struct mem_info *mi = zalloc(sizeof(*mi));
1254
1255         if (!mi)
1256                 return NULL;
1257
1258         ip__resolve_ams(al->machine, al->thread, &mi->iaddr, sample->ip);
1259         ip__resolve_data(al->machine, al->thread, al->cpumode,
1260                          &mi->daddr, sample->addr);
1261         mi->data_src.val = sample->data_src;
1262
1263         return mi;
1264 }
1265
1266 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1267                                            struct addr_location *al)
1268 {
1269         unsigned int i;
1270         const struct branch_stack *bs = sample->branch_stack;
1271         struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1272
1273         if (!bi)
1274                 return NULL;
1275
1276         for (i = 0; i < bs->nr; i++) {
1277                 ip__resolve_ams(al->machine, al->thread, &bi[i].to, bs->entries[i].to);
1278                 ip__resolve_ams(al->machine, al->thread, &bi[i].from, bs->entries[i].from);
1279                 bi[i].flags = bs->entries[i].flags;
1280         }
1281         return bi;
1282 }
1283
1284 static int machine__resolve_callchain_sample(struct machine *machine,
1285                                              struct thread *thread,
1286                                              struct ip_callchain *chain,
1287                                              struct symbol **parent,
1288                                              struct addr_location *root_al,
1289                                              int max_stack)
1290 {
1291         u8 cpumode = PERF_RECORD_MISC_USER;
1292         int chain_nr = min(max_stack, (int)chain->nr);
1293         int i;
1294         int err;
1295
1296         callchain_cursor_reset(&callchain_cursor);
1297
1298         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1299                 pr_warning("corrupted callchain. skipping...\n");
1300                 return 0;
1301         }
1302
1303         for (i = 0; i < chain_nr; i++) {
1304                 u64 ip;
1305                 struct addr_location al;
1306
1307                 if (callchain_param.order == ORDER_CALLEE)
1308                         ip = chain->ips[i];
1309                 else
1310                         ip = chain->ips[chain->nr - i - 1];
1311
1312                 if (ip >= PERF_CONTEXT_MAX) {
1313                         switch (ip) {
1314                         case PERF_CONTEXT_HV:
1315                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1316                                 break;
1317                         case PERF_CONTEXT_KERNEL:
1318                                 cpumode = PERF_RECORD_MISC_KERNEL;
1319                                 break;
1320                         case PERF_CONTEXT_USER:
1321                                 cpumode = PERF_RECORD_MISC_USER;
1322                                 break;
1323                         default:
1324                                 pr_debug("invalid callchain context: "
1325                                          "%"PRId64"\n", (s64) ip);
1326                                 /*
1327                                  * It seems the callchain is corrupted.
1328                                  * Discard all.
1329                                  */
1330                                 callchain_cursor_reset(&callchain_cursor);
1331                                 return 0;
1332                         }
1333                         continue;
1334                 }
1335
1336                 al.filtered = 0;
1337                 thread__find_addr_location(thread, machine, cpumode,
1338                                            MAP__FUNCTION, ip, &al);
1339                 if (al.sym != NULL) {
1340                         if (sort__has_parent && !*parent &&
1341                             symbol__match_regex(al.sym, &parent_regex))
1342                                 *parent = al.sym;
1343                         else if (have_ignore_callees && root_al &&
1344                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1345                                 /* Treat this symbol as the root,
1346                                    forgetting its callees. */
1347                                 *root_al = al;
1348                                 callchain_cursor_reset(&callchain_cursor);
1349                         }
1350                 }
1351
1352                 err = callchain_cursor_append(&callchain_cursor,
1353                                               ip, al.map, al.sym);
1354                 if (err)
1355                         return err;
1356         }
1357
1358         return 0;
1359 }
1360
1361 static int unwind_entry(struct unwind_entry *entry, void *arg)
1362 {
1363         struct callchain_cursor *cursor = arg;
1364         return callchain_cursor_append(cursor, entry->ip,
1365                                        entry->map, entry->sym);
1366 }
1367
1368 int machine__resolve_callchain(struct machine *machine,
1369                                struct perf_evsel *evsel,
1370                                struct thread *thread,
1371                                struct perf_sample *sample,
1372                                struct symbol **parent,
1373                                struct addr_location *root_al,
1374                                int max_stack)
1375 {
1376         int ret;
1377
1378         ret = machine__resolve_callchain_sample(machine, thread,
1379                                                 sample->callchain, parent,
1380                                                 root_al, max_stack);
1381         if (ret)
1382                 return ret;
1383
1384         /* Can we do dwarf post unwind? */
1385         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1386               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1387                 return 0;
1388
1389         /* Bail out if nothing was captured. */
1390         if ((!sample->user_regs.regs) ||
1391             (!sample->user_stack.size))
1392                 return 0;
1393
1394         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1395                                    thread, sample, max_stack);
1396
1397 }
1398
1399 int machine__for_each_thread(struct machine *machine,
1400                              int (*fn)(struct thread *thread, void *p),
1401                              void *priv)
1402 {
1403         struct rb_node *nd;
1404         struct thread *thread;
1405         int rc = 0;
1406
1407         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1408                 thread = rb_entry(nd, struct thread, rb_node);
1409                 rc = fn(thread, priv);
1410                 if (rc != 0)
1411                         return rc;
1412         }
1413
1414         list_for_each_entry(thread, &machine->dead_threads, node) {
1415                 rc = fn(thread, priv);
1416                 if (rc != 0)
1417                         return rc;
1418         }
1419         return rc;
1420 }
1421
1422 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1423                                   struct target *target, struct thread_map *threads,
1424                                   perf_event__handler_t process, bool data_mmap)
1425 {
1426         if (target__has_task(target))
1427                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1428         else if (target__has_cpu(target))
1429                 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1430         /* command specified */
1431         return 0;
1432 }