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