tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include "event.h"
   3 #include "debug.h"
   4 #include "sort.h"
   5 #include "string.h"
   6 #include "strlist.h"
   7 #include "thread.h"
   8 #include "thread_map.h"
   9
  10 static const char *perf_event__names[] = {
  11         [0]                                     = "TOTAL",
  12         [PERF_RECORD_MMAP]                      = "MMAP",
  13         [PERF_RECORD_LOST]                      = "LOST",
  14         [PERF_RECORD_COMM]                      = "COMM",
  15         [PERF_RECORD_EXIT]                      = "EXIT",
  16         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  17         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  18         [PERF_RECORD_FORK]                      = "FORK",
  19         [PERF_RECORD_READ]                      = "READ",
  20         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  21         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  22         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  23         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  24         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  25         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  26 };
  27
  28 const char *perf_event__name(unsigned int id)
  29 {
  30         if (id >= ARRAY_SIZE(perf_event__names))
  31                 return "INVALID";
  32         if (!perf_event__names[id])
  33                 return "UNKNOWN";
  34         return perf_event__names[id];
  35 }
  36
  37 static struct perf_sample synth_sample = {
  38         .pid       = -1,
  39         .tid       = -1,
  40         .time      = -1,
  41         .stream_id = -1,
  42         .cpu       = -1,
  43         .period    = 1,
  44 };
  45
  46 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
  47 {
  48         char filename[PATH_MAX];
  49         char bf[BUFSIZ];
  50         FILE *fp;
  51         size_t size = 0;
  52         pid_t tgid = -1;
  53
  54         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  55
  56         fp = fopen(filename, "r");
  57         if (fp == NULL) {
  58                 pr_debug("couldn't open %s\n", filename);
  59                 return 0;
  60         }
  61
  62         while (!comm[0] || (tgid < 0)) {
  63                 if (fgets(bf, sizeof(bf), fp) == NULL) {
  64                         pr_warning("couldn't get COMM and pgid, malformed %s\n",
  65                                    filename);
  66                         break;
  67                 }
  68
  69                 if (memcmp(bf, "Name:", 5) == 0) {
  70                         char *name = bf + 5;
  71                         while (*name && isspace(*name))
  72                                 ++name;
  73                         size = strlen(name) - 1;
  74                         if (size >= len)
  75                                 size = len - 1;
  76                         memcpy(comm, name, size);
  77                         comm[size] = '\0';
  78
  79                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
  80                         char *tgids = bf + 5;
  81                         while (*tgids && isspace(*tgids))
  82                                 ++tgids;
  83                         tgid = atoi(tgids);
  84                 }
  85         }
  86
  87         fclose(fp);
  88
  89         return tgid;
  90 }
  91
  92 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
  93                                          union perf_event *event, pid_t pid,
  94                                          int full,
  95                                          perf_event__handler_t process,
  96                                          struct machine *machine)
  97 {
  98         char filename[PATH_MAX];
  99         size_t size;
 100         DIR *tasks;
 101         struct dirent dirent, *next;
 102         pid_t tgid;
 103
 104         memset(&event->comm, 0, sizeof(event->comm));
 105
 106         tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
 107                                          sizeof(event->comm.comm));
 108         if (tgid < 0)
 109                 goto out;
 110
 111         event->comm.pid = tgid;
 112         event->comm.header.type = PERF_RECORD_COMM;
 113
 114         size = strlen(event->comm.comm) + 1;
 115         size = ALIGN(size, sizeof(u64));
 116         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 117         event->comm.header.size = (sizeof(event->comm) -
 118                                 (sizeof(event->comm.comm) - size) +
 119                                 machine->id_hdr_size);
 120         if (!full) {
 121                 event->comm.tid = pid;
 122
 123                 process(tool, event, &synth_sample, machine);
 124                 goto out;
 125         }
 126
 127         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
 128
 129         tasks = opendir(filename);
 130         if (tasks == NULL) {
 131                 pr_debug("couldn't open %s\n", filename);
 132                 return 0;
 133         }
 134
 135         while (!readdir_r(tasks, &dirent, &next) && next) {
 136                 char *end;
 137                 pid = strtol(dirent.d_name, &end, 10);
 138                 if (*end)
 139                         continue;
 140
 141                 /* already have tgid; jut want to update the comm */
 142                 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
 143                                          sizeof(event->comm.comm));
 144
 145                 size = strlen(event->comm.comm) + 1;
 146                 size = ALIGN(size, sizeof(u64));
 147                 memset(event->comm.comm + size, 0, machine->id_hdr_size);
 148                 event->comm.header.size = (sizeof(event->comm) -
 149                                           (sizeof(event->comm.comm) - size) +
 150                                           machine->id_hdr_size);
 151
 152                 event->comm.tid = pid;
 153
 154                 process(tool, event, &synth_sample, machine);
 155         }
 156
 157         closedir(tasks);
 158 out:
 159         return tgid;
 160 }
 161
 162 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 163                                               union perf_event *event,
 164                                               pid_t pid, pid_t tgid,
 165                                               perf_event__handler_t process,
 166                                               struct machine *machine)
 167 {
 168         char filename[PATH_MAX];
 169         FILE *fp;
 170
 171         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
 172
 173         fp = fopen(filename, "r");
 174         if (fp == NULL) {
 175                 /*
 176                  * We raced with a task exiting - just return:
 177                  */
 178                 pr_debug("couldn't open %s\n", filename);
 179                 return -1;
 180         }
 181
 182         event->header.type = PERF_RECORD_MMAP;
 183         /*
 184          * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 185          */
 186         event->header.misc = PERF_RECORD_MISC_USER;
 187
 188         while (1) {
 189                 char bf[BUFSIZ], *pbf = bf;
 190                 int n;
 191                 size_t size;
 192                 if (fgets(bf, sizeof(bf), fp) == NULL)
 193                         break;
 194
 195                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 196                 n = hex2u64(pbf, &event->mmap.start);
 197                 if (n < 0)
 198                         continue;
 199                 pbf += n + 1;
 200                 n = hex2u64(pbf, &event->mmap.len);
 201                 if (n < 0)
 202                         continue;
 203                 pbf += n + 3;
 204                 if (*pbf == 'x') { /* vm_exec */
 205                         char anonstr[] = "//anon\n";
 206                         char *execname = strchr(bf, '/');
 207
 208                         /* Catch VDSO */
 209                         if (execname == NULL)
 210                                 execname = strstr(bf, "[vdso]");
 211
 212                         /* Catch anonymous mmaps */
 213                         if ((execname == NULL) && !strstr(bf, "["))
 214                                 execname = anonstr;
 215
 216                         if (execname == NULL)
 217                                 continue;
 218
 219                         pbf += 3;
 220                         n = hex2u64(pbf, &event->mmap.pgoff);
 221
 222                         size = strlen(execname);
 223                         execname[size - 1] = '\0'; /* Remove \n */
 224                         memcpy(event->mmap.filename, execname, size);
 225                         size = ALIGN(size, sizeof(u64));
 226                         event->mmap.len -= event->mmap.start;
 227                         event->mmap.header.size = (sizeof(event->mmap) -
 228                                                 (sizeof(event->mmap.filename) - size));
 229                         memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 230                         event->mmap.header.size += machine->id_hdr_size;
 231                         event->mmap.pid = tgid;
 232                         event->mmap.tid = pid;
 233
 234                         process(tool, event, &synth_sample, machine);
 235                 }
 236         }
 237
 238         fclose(fp);
 239         return 0;
 240 }
 241
 242 int perf_event__synthesize_modules(struct perf_tool *tool,
 243                                    perf_event__handler_t process,
 244                                    struct machine *machine)
 245 {
 246         struct rb_node *nd;
 247         struct map_groups *kmaps = &machine->kmaps;
 248         union perf_event *event = zalloc((sizeof(event->mmap) +
 249                                           machine->id_hdr_size));
 250         if (event == NULL) {
 251                 pr_debug("Not enough memory synthesizing mmap event "
 252                          "for kernel modules\n");
 253                 return -1;
 254         }
 255
 256         event->header.type = PERF_RECORD_MMAP;
 257
 258         /*
 259          * kernel uses 0 for user space maps, see kernel/perf_event.c
 260          * __perf_event_mmap
 261          */
 262         if (machine__is_host(machine))
 263                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 264         else
 265                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 266
 267         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 268              nd; nd = rb_next(nd)) {
 269                 size_t size;
 270                 struct map *pos = rb_entry(nd, struct map, rb_node);
 271
 272                 if (pos->dso->kernel)
 273                         continue;
 274
 275                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 276                 event->mmap.header.type = PERF_RECORD_MMAP;
 277                 event->mmap.header.size = (sizeof(event->mmap) -
 278                                         (sizeof(event->mmap.filename) - size));
 279                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 280                 event->mmap.header.size += machine->id_hdr_size;
 281                 event->mmap.start = pos->start;
 282                 event->mmap.len   = pos->end - pos->start;
 283                 event->mmap.pid   = machine->pid;
 284
 285                 memcpy(event->mmap.filename, pos->dso->long_name,
 286                        pos->dso->long_name_len + 1);
 287                 process(tool, event, &synth_sample, machine);
 288         }
 289
 290         free(event);
 291         return 0;
 292 }
 293
 294 static int __event__synthesize_thread(union perf_event *comm_event,
 295                                       union perf_event *mmap_event,
 296                                       pid_t pid, int full,
 297                                           perf_event__handler_t process,
 298                                       struct perf_tool *tool,
 299                                       struct machine *machine)
 300 {
 301         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
 302                                                  process, machine);
 303         if (tgid == -1)
 304                 return -1;
 305         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 306                                                   process, machine);
 307 }
 308
 309 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 310                                       struct thread_map *threads,
 311                                       perf_event__handler_t process,
 312                                       struct machine *machine)
 313 {
 314         union perf_event *comm_event, *mmap_event;
 315         int err = -1, thread, j;
 316
 317         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 318         if (comm_event == NULL)
 319                 goto out;
 320
 321         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 322         if (mmap_event == NULL)
 323                 goto out_free_comm;
 324
 325         err = 0;
 326         for (thread = 0; thread < threads->nr; ++thread) {
 327                 if (__event__synthesize_thread(comm_event, mmap_event,
 328                                                threads->map[thread], 0,
 329                                                process, tool, machine)) {
 330                         err = -1;
 331                         break;
 332                 }
 333
 334                 /*
 335                  * comm.pid is set to thread group id by
 336                  * perf_event__synthesize_comm
 337                  */
 338                 if ((int) comm_event->comm.pid != threads->map[thread]) {
 339                         bool need_leader = true;
 340
 341                         /* is thread group leader in thread_map? */
 342                         for (j = 0; j < threads->nr; ++j) {
 343                                 if ((int) comm_event->comm.pid == threads->map[j]) {
 344                                         need_leader = false;
 345                                         break;
 346                                 }
 347                         }
 348
 349                         /* if not, generate events for it */
 350                         if (need_leader &&
 351                             __event__synthesize_thread(comm_event,
 352                                                       mmap_event,
 353                                                       comm_event->comm.pid, 0,
 354                                                       process, tool, machine)) {
 355                                 err = -1;
 356                                 break;
 357                         }
 358                 }
 359         }
 360         free(mmap_event);
 361 out_free_comm:
 362         free(comm_event);
 363 out:
 364         return err;
 365 }
 366
 367 int perf_event__synthesize_threads(struct perf_tool *tool,
 368                                    perf_event__handler_t process,
 369                                    struct machine *machine)
 370 {
 371         DIR *proc;
 372         struct dirent dirent, *next;
 373         union perf_event *comm_event, *mmap_event;
 374         int err = -1;
 375
 376         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 377         if (comm_event == NULL)
 378                 goto out;
 379
 380         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 381         if (mmap_event == NULL)
 382                 goto out_free_comm;
 383
 384         proc = opendir("/proc");
 385         if (proc == NULL)
 386                 goto out_free_mmap;
 387
 388         while (!readdir_r(proc, &dirent, &next) && next) {
 389                 char *end;
 390                 pid_t pid = strtol(dirent.d_name, &end, 10);
 391
 392                 if (*end) /* only interested in proper numerical dirents */
 393                         continue;
 394
 395                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
 396                                            process, tool, machine);
 397         }
 398
 399         closedir(proc);
 400         err = 0;
 401 out_free_mmap:
 402         free(mmap_event);
 403 out_free_comm:
 404         free(comm_event);
 405 out:
 406         return err;
 407 }
 408
 409 struct process_symbol_args {
 410         const char *name;
 411         u64        start;
 412 };
 413
 414 static int find_symbol_cb(void *arg, const char *name, char type,
 415                           u64 start)
 416 {
 417         struct process_symbol_args *args = arg;
 418
 419         /*
 420          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 421          * an 'A' to the same address as "_stext".
 422          */
 423         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 424               type == 'A') || strcmp(name, args->name))
 425                 return 0;
 426
 427         args->start = start;
 428         return 1;
 429 }
 430
 431 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 432                                        perf_event__handler_t process,
 433                                        struct machine *machine,
 434                                        const char *symbol_name)
 435 {
 436         size_t size;
 437         const char *filename, *mmap_name;
 438         char path[PATH_MAX];
 439         char name_buff[PATH_MAX];
 440         struct map *map;
 441         int err;
 442         /*
 443          * We should get this from /sys/kernel/sections/.text, but till that is
 444          * available use this, and after it is use this as a fallback for older
 445          * kernels.
 446          */
 447         struct process_symbol_args args = { .name = symbol_name, };
 448         union perf_event *event = zalloc((sizeof(event->mmap) +
 449                                           machine->id_hdr_size));
 450         if (event == NULL) {
 451                 pr_debug("Not enough memory synthesizing mmap event "
 452                          "for kernel modules\n");
 453                 return -1;
 454         }
 455
 456         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 457         if (machine__is_host(machine)) {
 458                 /*
 459                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 460                  * see kernel/perf_event.c __perf_event_mmap
 461                  */
 462                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 463                 filename = "/proc/kallsyms";
 464         } else {
 465                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 466                 if (machine__is_default_guest(machine))
 467                         filename = (char *) symbol_conf.default_guest_kallsyms;
 468                 else {
 469                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 470                         filename = path;
 471                 }
 472         }
 473
 474         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
 475                 return -ENOENT;
 476
 477         map = machine->vmlinux_maps[MAP__FUNCTION];
 478         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 479                         "%s%s", mmap_name, symbol_name) + 1;
 480         size = ALIGN(size, sizeof(u64));
 481         event->mmap.header.type = PERF_RECORD_MMAP;
 482         event->mmap.header.size = (sizeof(event->mmap) -
 483                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 484         event->mmap.pgoff = args.start;
 485         event->mmap.start = map->start;
 486         event->mmap.len   = map->end - event->mmap.start;
 487         event->mmap.pid   = machine->pid;
 488
 489         err = process(tool, event, &synth_sample, machine);
 490         free(event);
 491
 492         return err;
 493 }
 494
 495 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 496 {
 497         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
 498 }
 499
 500 int perf_event__process_comm(struct perf_tool *tool __used,
 501                              union perf_event *event,
 502                              struct perf_sample *sample __used,
 503                              struct machine *machine)
 504 {
 505         struct thread *thread = machine__findnew_thread(machine, event->comm.tid);
 506
 507         if (dump_trace)
 508                 perf_event__fprintf_comm(event, stdout);
 509
 510         if (thread == NULL || thread__set_comm(thread, event->comm.comm)) {
 511                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 512                 return -1;
 513         }
 514
 515         return 0;
 516 }
 517
 518 int perf_event__process_lost(struct perf_tool *tool __used,
 519                              union perf_event *event,
 520                              struct perf_sample *sample __used,
 521                              struct machine *machine __used)
 522 {
 523         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 524                     event->lost.id, event->lost.lost);
 525         return 0;
 526 }
 527
 528 static void perf_event__set_kernel_mmap_len(union perf_event *event,
 529                                             struct map **maps)
 530 {
 531         maps[MAP__FUNCTION]->start = event->mmap.start;
 532         maps[MAP__FUNCTION]->end   = event->mmap.start + event->mmap.len;
 533         /*
 534          * Be a bit paranoid here, some perf.data file came with
 535          * a zero sized synthesized MMAP event for the kernel.
 536          */
 537         if (maps[MAP__FUNCTION]->end == 0)
 538                 maps[MAP__FUNCTION]->end = ~0ULL;
 539 }
 540
 541 static int perf_event__process_kernel_mmap(struct perf_tool *tool __used,
 542                                            union perf_event *event,
 543                                            struct machine *machine)
 544 {
 545         struct map *map;
 546         char kmmap_prefix[PATH_MAX];
 547         enum dso_kernel_type kernel_type;
 548         bool is_kernel_mmap;
 549
 550         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 551         if (machine__is_host(machine))
 552                 kernel_type = DSO_TYPE_KERNEL;
 553         else
 554                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 555
 556         is_kernel_mmap = memcmp(event->mmap.filename,
 557                                 kmmap_prefix,
 558                                 strlen(kmmap_prefix) - 1) == 0;
 559         if (event->mmap.filename[0] == '/' ||
 560             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 561
 562                 char short_module_name[1024];
 563                 char *name, *dot;
 564
 565                 if (event->mmap.filename[0] == '/') {
 566                         name = strrchr(event->mmap.filename, '/');
 567                         if (name == NULL)
 568                                 goto out_problem;
 569
 570                         ++name; /* skip / */
 571                         dot = strrchr(name, '.');
 572                         if (dot == NULL)
 573                                 goto out_problem;
 574                         snprintf(short_module_name, sizeof(short_module_name),
 575                                         "[%.*s]", (int)(dot - name), name);
 576                         strxfrchar(short_module_name, '-', '_');
 577                 } else
 578                         strcpy(short_module_name, event->mmap.filename);
 579
 580                 map = machine__new_module(machine, event->mmap.start,
 581                                           event->mmap.filename);
 582                 if (map == NULL)
 583                         goto out_problem;
 584
 585                 name = strdup(short_module_name);
 586                 if (name == NULL)
 587                         goto out_problem;
 588
 589                 map->dso->short_name = name;
 590                 map->dso->sname_alloc = 1;
 591                 map->end = map->start + event->mmap.len;
 592         } else if (is_kernel_mmap) {
 593                 const char *symbol_name = (event->mmap.filename +
 594                                 strlen(kmmap_prefix));
 595                 /*
 596                  * Should be there already, from the build-id table in
 597                  * the header.
 598                  */
 599                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 600                                                      kmmap_prefix);
 601                 if (kernel == NULL)
 602                         goto out_problem;
 603
 604                 kernel->kernel = kernel_type;
 605                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 606                         goto out_problem;
 607
 608                 perf_event__set_kernel_mmap_len(event, machine->vmlinux_maps);
 609
 610                 /*
 611                  * Avoid using a zero address (kptr_restrict) for the ref reloc
 612                  * symbol. Effectively having zero here means that at record
 613                  * time /proc/sys/kernel/kptr_restrict was non zero.
 614                  */
 615                 if (event->mmap.pgoff != 0) {
 616                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 617                                                          symbol_name,
 618                                                          event->mmap.pgoff);
 619                 }
 620
 621                 if (machine__is_default_guest(machine)) {
 622                         /*
 623                          * preload dso of guest kernel and modules
 624                          */
 625                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
 626                                   NULL);
 627                 }
 628         }
 629         return 0;
 630 out_problem:
 631         return -1;
 632 }
 633
 634 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 635 {
 636         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
 637                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 638                        event->mmap.len, event->mmap.pgoff, event->mmap.filename);
 639 }
 640
 641 int perf_event__process_mmap(struct perf_tool *tool,
 642                              union perf_event *event,
 643                              struct perf_sample *sample __used,
 644                              struct machine *machine)
 645 {
 646         struct thread *thread;
 647         struct map *map;
 648         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 649         int ret = 0;
 650
 651         if (dump_trace)
 652                 perf_event__fprintf_mmap(event, stdout);
 653
 654         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
 655             cpumode == PERF_RECORD_MISC_KERNEL) {
 656                 ret = perf_event__process_kernel_mmap(tool, event, machine);
 657                 if (ret < 0)
 658                         goto out_problem;
 659                 return 0;
 660         }
 661
 662         thread = machine__findnew_thread(machine, event->mmap.pid);
 663         if (thread == NULL)
 664                 goto out_problem;
 665         map = map__new(&machine->user_dsos, event->mmap.start,
 666                         event->mmap.len, event->mmap.pgoff,
 667                         event->mmap.pid, event->mmap.filename,
 668                         MAP__FUNCTION);
 669         if (map == NULL)
 670                 goto out_problem;
 671
 672         thread__insert_map(thread, map);
 673         return 0;
 674
 675 out_problem:
 676         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 677         return 0;
 678 }
 679
 680 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 681 {
 682         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 683                        event->fork.pid, event->fork.tid,
 684                        event->fork.ppid, event->fork.ptid);
 685 }
 686
 687 int perf_event__process_task(struct perf_tool *tool __used,
 688                              union perf_event *event,
 689                              struct perf_sample *sample __used,
 690                               struct machine *machine)
 691 {
 692         struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
 693         struct thread *parent = machine__findnew_thread(machine, event->fork.ptid);
 694
 695         if (dump_trace)
 696                 perf_event__fprintf_task(event, stdout);
 697
 698         if (event->header.type == PERF_RECORD_EXIT) {
 699                 machine__remove_thread(machine, thread);
 700                 return 0;
 701         }
 702
 703         if (thread == NULL || parent == NULL ||
 704             thread__fork(thread, parent) < 0) {
 705                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 706                 return -1;
 707         }
 708
 709         return 0;
 710 }
 711
 712 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 713 {
 714         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 715                              perf_event__name(event->header.type));
 716
 717         switch (event->header.type) {
 718         case PERF_RECORD_COMM:
 719                 ret += perf_event__fprintf_comm(event, fp);
 720                 break;
 721         case PERF_RECORD_FORK:
 722         case PERF_RECORD_EXIT:
 723                 ret += perf_event__fprintf_task(event, fp);
 724                 break;
 725         case PERF_RECORD_MMAP:
 726                 ret += perf_event__fprintf_mmap(event, fp);
 727                 break;
 728         default:
 729                 ret += fprintf(fp, "\n");
 730         }
 731
 732         return ret;
 733 }
 734
 735 int perf_event__process(struct perf_tool *tool, union perf_event *event,
 736                         struct perf_sample *sample, struct machine *machine)
 737 {
 738         switch (event->header.type) {
 739         case PERF_RECORD_COMM:
 740                 perf_event__process_comm(tool, event, sample, machine);
 741                 break;
 742         case PERF_RECORD_MMAP:
 743                 perf_event__process_mmap(tool, event, sample, machine);
 744                 break;
 745         case PERF_RECORD_FORK:
 746         case PERF_RECORD_EXIT:
 747                 perf_event__process_task(tool, event, sample, machine);
 748                 break;
 749         case PERF_RECORD_LOST:
 750                 perf_event__process_lost(tool, event, sample, machine);
 751         default:
 752                 break;
 753         }
 754
 755         return 0;
 756 }
 757
 758 void thread__find_addr_map(struct thread *self,
 759                            struct machine *machine, u8 cpumode,
 760                            enum map_type type, u64 addr,
 761                            struct addr_location *al)
 762 {
 763         struct map_groups *mg = &self->mg;
 764
 765         al->thread = self;
 766         al->addr = addr;
 767         al->cpumode = cpumode;
 768         al->filtered = false;
 769
 770         if (machine == NULL) {
 771                 al->map = NULL;
 772                 return;
 773         }
 774
 775         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 776                 al->level = 'k';
 777                 mg = &machine->kmaps;
 778         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 779                 al->level = '.';
 780         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 781                 al->level = 'g';
 782                 mg = &machine->kmaps;
 783         } else {
 784                 /*
 785                  * 'u' means guest os user space.
 786                  * TODO: We don't support guest user space. Might support late.
 787                  */
 788                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
 789                         al->level = 'u';
 790                 else
 791                         al->level = 'H';
 792                 al->map = NULL;
 793
 794                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 795                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 796                         !perf_guest)
 797                         al->filtered = true;
 798                 if ((cpumode == PERF_RECORD_MISC_USER ||
 799                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 800                         !perf_host)
 801                         al->filtered = true;
 802
 803                 return;
 804         }
 805 try_again:
 806         al->map = map_groups__find(mg, type, al->addr);
 807         if (al->map == NULL) {
 808                 /*
 809                  * If this is outside of all known maps, and is a negative
 810                  * address, try to look it up in the kernel dso, as it might be
 811                  * a vsyscall or vdso (which executes in user-mode).
 812                  *
 813                  * XXX This is nasty, we should have a symbol list in the
 814                  * "[vdso]" dso, but for now lets use the old trick of looking
 815                  * in the whole kernel symbol list.
 816                  */
 817                 if ((long long)al->addr < 0 &&
 818                     cpumode == PERF_RECORD_MISC_USER &&
 819                     machine && mg != &machine->kmaps) {
 820                         mg = &machine->kmaps;
 821                         goto try_again;
 822                 }
 823         } else
 824                 al->addr = al->map->map_ip(al->map, al->addr);
 825 }
 826
 827 void thread__find_addr_location(struct thread *thread, struct machine *machine,
 828                                 u8 cpumode, enum map_type type, u64 addr,
 829                                 struct addr_location *al,
 830                                 symbol_filter_t filter)
 831 {
 832         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
 833         if (al->map != NULL)
 834                 al->sym = map__find_symbol(al->map, al->addr, filter);
 835         else
 836                 al->sym = NULL;
 837 }
 838
 839 int perf_event__preprocess_sample(const union perf_event *event,
 840                                   struct machine *machine,
 841                                   struct addr_location *al,
 842                                   struct perf_sample *sample,
 843                                   symbol_filter_t filter)
 844 {
 845         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 846         struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
 847
 848         if (thread == NULL)
 849                 return -1;
 850
 851         if (symbol_conf.comm_list &&
 852             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 853                 goto out_filtered;
 854
 855         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 856         /*
 857          * Have we already created the kernel maps for this machine?
 858          *
 859          * This should have happened earlier, when we processed the kernel MMAP
 860          * events, but for older perf.data files there was no such thing, so do
 861          * it now.
 862          */
 863         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 864             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 865                 machine__create_kernel_maps(machine);
 866
 867         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 868                               event->ip.ip, al);
 869         dump_printf(" ...... dso: %s\n",
 870                     al->map ? al->map->dso->long_name :
 871                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 872         al->sym = NULL;
 873         al->cpu = sample->cpu;
 874
 875         if (al->map) {
 876                 struct dso *dso = al->map->dso;
 877
 878                 if (symbol_conf.dso_list &&
 879                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
 880                                                   dso->short_name) ||
 881                                (dso->short_name != dso->long_name &&
 882                                 strlist__has_entry(symbol_conf.dso_list,
 883                                                    dso->long_name)))))
 884                         goto out_filtered;
 885
 886                 al->sym = map__find_symbol(al->map, al->addr, filter);
 887         }
 888
 889         if (symbol_conf.sym_list && al->sym &&
 890             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 891                 goto out_filtered;
 892
 893         return 0;
 894
 895 out_filtered:
 896         al->filtered = true;
 897         return 0;
 898 }