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