tools/perf/util/event.c

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