Pileus Git - ~andy/linux/blob - tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include "event.h"
   3 #include "debug.h"
   4 #include "machine.h"
   5 #include "sort.h"
   6 #include "string.h"
   7 #include "strlist.h"
   8 #include "thread.h"
   9 #include "thread_map.h"
  10 #include "symbol/kallsyms.h"
  11
  12 static const char *perf_event__names[] = {
  13         [0]                                     = "TOTAL",
  14         [PERF_RECORD_MMAP]                      = "MMAP",
  15         [PERF_RECORD_MMAP2]                     = "MMAP2",
  16         [PERF_RECORD_LOST]                      = "LOST",
  17         [PERF_RECORD_COMM]                      = "COMM",
  18         [PERF_RECORD_EXIT]                      = "EXIT",
  19         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  20         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  21         [PERF_RECORD_FORK]                      = "FORK",
  22         [PERF_RECORD_READ]                      = "READ",
  23         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  24         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  25         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  26         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  27         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  28         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  29 };
  30
  31 const char *perf_event__name(unsigned int id)
  32 {
  33         if (id >= ARRAY_SIZE(perf_event__names))
  34                 return "INVALID";
  35         if (!perf_event__names[id])
  36                 return "UNKNOWN";
  37         return perf_event__names[id];
  38 }
  39
  40 static struct perf_sample synth_sample = {
  41         .pid       = -1,
  42         .tid       = -1,
  43         .time      = -1,
  44         .stream_id = -1,
  45         .cpu       = -1,
  46         .period    = 1,
  47 };
  48
  49 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
  50 {
  51         char filename[PATH_MAX];
  52         char bf[BUFSIZ];
  53         FILE *fp;
  54         size_t size = 0;
  55         pid_t tgid = -1;
  56
  57         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  58
  59         fp = fopen(filename, "r");
  60         if (fp == NULL) {
  61                 pr_debug("couldn't open %s\n", filename);
  62                 return 0;
  63         }
  64
  65         while (!comm[0] || (tgid < 0)) {
  66                 if (fgets(bf, sizeof(bf), fp) == NULL) {
  67                         pr_warning("couldn't get COMM and pgid, malformed %s\n",
  68                                    filename);
  69                         break;
  70                 }
  71
  72                 if (memcmp(bf, "Name:", 5) == 0) {
  73                         char *name = bf + 5;
  74                         while (*name && isspace(*name))
  75                                 ++name;
  76                         size = strlen(name) - 1;
  77                         if (size >= len)
  78                                 size = len - 1;
  79                         memcpy(comm, name, size);
  80                         comm[size] = '\0';
  81
  82                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
  83                         char *tgids = bf + 5;
  84                         while (*tgids && isspace(*tgids))
  85                                 ++tgids;
  86                         tgid = atoi(tgids);
  87                 }
  88         }
  89
  90         fclose(fp);
  91
  92         return tgid;
  93 }
  94
  95 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
  96                                          union perf_event *event, pid_t pid,
  97                                          int full,
  98                                          perf_event__handler_t process,
  99                                          struct machine *machine)
 100 {
 101         char filename[PATH_MAX];
 102         size_t size;
 103         DIR *tasks;
 104         struct dirent dirent, *next;
 105         pid_t tgid;
 106
 107         memset(&event->comm, 0, sizeof(event->comm));
 108
 109         tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
 110                                          sizeof(event->comm.comm));
 111         if (tgid < 0)
 112                 goto out;
 113
 114         event->comm.pid = tgid;
 115         event->comm.header.type = PERF_RECORD_COMM;
 116
 117         size = strlen(event->comm.comm) + 1;
 118         size = PERF_ALIGN(size, sizeof(u64));
 119         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 120         event->comm.header.size = (sizeof(event->comm) -
 121                                 (sizeof(event->comm.comm) - size) +
 122                                 machine->id_hdr_size);
 123         if (!full) {
 124                 event->comm.tid = pid;
 125
 126                 if (process(tool, event, &synth_sample, machine) != 0)
 127                         return -1;
 128
 129                 goto out;
 130         }
 131
 132         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
 133
 134         tasks = opendir(filename);
 135         if (tasks == NULL) {
 136                 pr_debug("couldn't open %s\n", filename);
 137                 return 0;
 138         }
 139
 140         while (!readdir_r(tasks, &dirent, &next) && next) {
 141                 char *end;
 142                 pid = strtol(dirent.d_name, &end, 10);
 143                 if (*end)
 144                         continue;
 145
 146                 /* already have tgid; jut want to update the comm */
 147                 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
 148                                          sizeof(event->comm.comm));
 149
 150                 size = strlen(event->comm.comm) + 1;
 151                 size = PERF_ALIGN(size, sizeof(u64));
 152                 memset(event->comm.comm + size, 0, machine->id_hdr_size);
 153                 event->comm.header.size = (sizeof(event->comm) -
 154                                           (sizeof(event->comm.comm) - size) +
 155                                           machine->id_hdr_size);
 156
 157                 event->comm.tid = pid;
 158
 159                 if (process(tool, event, &synth_sample, machine) != 0) {
 160                         tgid = -1;
 161                         break;
 162                 }
 163         }
 164
 165         closedir(tasks);
 166 out:
 167         return tgid;
 168 }
 169
 170 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 171                                               union perf_event *event,
 172                                               pid_t pid, pid_t tgid,
 173                                               perf_event__handler_t process,
 174                                               struct machine *machine,
 175                                               bool mmap_data)
 176 {
 177         char filename[PATH_MAX];
 178         FILE *fp;
 179         int rc = 0;
 180
 181         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
 182
 183         fp = fopen(filename, "r");
 184         if (fp == NULL) {
 185                 /*
 186                  * We raced with a task exiting - just return:
 187                  */
 188                 pr_debug("couldn't open %s\n", filename);
 189                 return -1;
 190         }
 191
 192         event->header.type = PERF_RECORD_MMAP;
 193
 194         while (1) {
 195                 char bf[BUFSIZ];
 196                 char prot[5];
 197                 char execname[PATH_MAX];
 198                 char anonstr[] = "//anon";
 199                 size_t size;
 200                 ssize_t n;
 201
 202                 if (fgets(bf, sizeof(bf), fp) == NULL)
 203                         break;
 204
 205                 /* ensure null termination since stack will be reused. */
 206                 strcpy(execname, "");
 207
 208                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 209                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
 210                        &event->mmap.start, &event->mmap.len, prot,
 211                        &event->mmap.pgoff,
 212                        execname);
 213                 /*
 214                  * Anon maps don't have the execname.
 215                  */
 216                 if (n < 4)
 217                         continue;
 218                 /*
 219                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 220                  */
 221                 event->header.misc = PERF_RECORD_MISC_USER;
 222
 223                 if (prot[2] != 'x') {
 224                         if (!mmap_data || prot[0] != 'r')
 225                                 continue;
 226
 227                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 228                 }
 229
 230                 if (!strcmp(execname, ""))
 231                         strcpy(execname, anonstr);
 232
 233                 size = strlen(execname) + 1;
 234                 memcpy(event->mmap.filename, execname, size);
 235                 size = PERF_ALIGN(size, sizeof(u64));
 236                 event->mmap.len -= event->mmap.start;
 237                 event->mmap.header.size = (sizeof(event->mmap) -
 238                                         (sizeof(event->mmap.filename) - size));
 239                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 240                 event->mmap.header.size += machine->id_hdr_size;
 241                 event->mmap.pid = tgid;
 242                 event->mmap.tid = pid;
 243
 244                 if (process(tool, event, &synth_sample, machine) != 0) {
 245                         rc = -1;
 246                         break;
 247                 }
 248         }
 249
 250         fclose(fp);
 251         return rc;
 252 }
 253
 254 int perf_event__synthesize_modules(struct perf_tool *tool,
 255                                    perf_event__handler_t process,
 256                                    struct machine *machine)
 257 {
 258         int rc = 0;
 259         struct rb_node *nd;
 260         struct map_groups *kmaps = &machine->kmaps;
 261         union perf_event *event = zalloc((sizeof(event->mmap) +
 262                                           machine->id_hdr_size));
 263         if (event == NULL) {
 264                 pr_debug("Not enough memory synthesizing mmap event "
 265                          "for kernel modules\n");
 266                 return -1;
 267         }
 268
 269         event->header.type = PERF_RECORD_MMAP;
 270
 271         /*
 272          * kernel uses 0 for user space maps, see kernel/perf_event.c
 273          * __perf_event_mmap
 274          */
 275         if (machine__is_host(machine))
 276                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 277         else
 278                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 279
 280         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 281              nd; nd = rb_next(nd)) {
 282                 size_t size;
 283                 struct map *pos = rb_entry(nd, struct map, rb_node);
 284
 285                 if (pos->dso->kernel)
 286                         continue;
 287
 288                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 289                 event->mmap.header.type = PERF_RECORD_MMAP;
 290                 event->mmap.header.size = (sizeof(event->mmap) -
 291                                         (sizeof(event->mmap.filename) - size));
 292                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 293                 event->mmap.header.size += machine->id_hdr_size;
 294                 event->mmap.start = pos->start;
 295                 event->mmap.len   = pos->end - pos->start;
 296                 event->mmap.pid   = machine->pid;
 297
 298                 memcpy(event->mmap.filename, pos->dso->long_name,
 299                        pos->dso->long_name_len + 1);
 300                 if (process(tool, event, &synth_sample, machine) != 0) {
 301                         rc = -1;
 302                         break;
 303                 }
 304         }
 305
 306         free(event);
 307         return rc;
 308 }
 309
 310 static int __event__synthesize_thread(union perf_event *comm_event,
 311                                       union perf_event *mmap_event,
 312                                       pid_t pid, int full,
 313                                           perf_event__handler_t process,
 314                                       struct perf_tool *tool,
 315                                       struct machine *machine, bool mmap_data)
 316 {
 317         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
 318                                                  process, machine);
 319         if (tgid == -1)
 320                 return -1;
 321         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 322                                                   process, machine, mmap_data);
 323 }
 324
 325 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 326                                       struct thread_map *threads,
 327                                       perf_event__handler_t process,
 328                                       struct machine *machine,
 329                                       bool mmap_data)
 330 {
 331         union perf_event *comm_event, *mmap_event;
 332         int err = -1, thread, j;
 333
 334         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 335         if (comm_event == NULL)
 336                 goto out;
 337
 338         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 339         if (mmap_event == NULL)
 340                 goto out_free_comm;
 341
 342         err = 0;
 343         for (thread = 0; thread < threads->nr; ++thread) {
 344                 if (__event__synthesize_thread(comm_event, mmap_event,
 345                                                threads->map[thread], 0,
 346                                                process, tool, machine,
 347                                                mmap_data)) {
 348                         err = -1;
 349                         break;
 350                 }
 351
 352                 /*
 353                  * comm.pid is set to thread group id by
 354                  * perf_event__synthesize_comm
 355                  */
 356                 if ((int) comm_event->comm.pid != threads->map[thread]) {
 357                         bool need_leader = true;
 358
 359                         /* is thread group leader in thread_map? */
 360                         for (j = 0; j < threads->nr; ++j) {
 361                                 if ((int) comm_event->comm.pid == threads->map[j]) {
 362                                         need_leader = false;
 363                                         break;
 364                                 }
 365                         }
 366
 367                         /* if not, generate events for it */
 368                         if (need_leader &&
 369                             __event__synthesize_thread(comm_event, mmap_event,
 370                                                        comm_event->comm.pid, 0,
 371                                                        process, tool, machine,
 372                                                        mmap_data)) {
 373                                 err = -1;
 374                                 break;
 375                         }
 376                 }
 377         }
 378         free(mmap_event);
 379 out_free_comm:
 380         free(comm_event);
 381 out:
 382         return err;
 383 }
 384
 385 int perf_event__synthesize_threads(struct perf_tool *tool,
 386                                    perf_event__handler_t process,
 387                                    struct machine *machine, bool mmap_data)
 388 {
 389         DIR *proc;
 390         struct dirent dirent, *next;
 391         union perf_event *comm_event, *mmap_event;
 392         int err = -1;
 393
 394         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 395         if (comm_event == NULL)
 396                 goto out;
 397
 398         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 399         if (mmap_event == NULL)
 400                 goto out_free_comm;
 401
 402         proc = opendir("/proc");
 403         if (proc == NULL)
 404                 goto out_free_mmap;
 405
 406         while (!readdir_r(proc, &dirent, &next) && next) {
 407                 char *end;
 408                 pid_t pid = strtol(dirent.d_name, &end, 10);
 409
 410                 if (*end) /* only interested in proper numerical dirents */
 411                         continue;
 412                 /*
 413                  * We may race with exiting thread, so don't stop just because
 414                  * one thread couldn't be synthesized.
 415                  */
 416                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
 417                                            process, tool, machine, mmap_data);
 418         }
 419
 420         err = 0;
 421         closedir(proc);
 422 out_free_mmap:
 423         free(mmap_event);
 424 out_free_comm:
 425         free(comm_event);
 426 out:
 427         return err;
 428 }
 429
 430 struct process_symbol_args {
 431         const char *name;
 432         u64        start;
 433 };
 434
 435 static int find_symbol_cb(void *arg, const char *name, char type,
 436                           u64 start)
 437 {
 438         struct process_symbol_args *args = arg;
 439
 440         /*
 441          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 442          * an 'A' to the same address as "_stext".
 443          */
 444         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 445               type == 'A') || strcmp(name, args->name))
 446                 return 0;
 447
 448         args->start = start;
 449         return 1;
 450 }
 451
 452 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 453                                        perf_event__handler_t process,
 454                                        struct machine *machine,
 455                                        const char *symbol_name)
 456 {
 457         size_t size;
 458         const char *filename, *mmap_name;
 459         char path[PATH_MAX];
 460         char name_buff[PATH_MAX];
 461         struct map *map;
 462         int err;
 463         /*
 464          * We should get this from /sys/kernel/sections/.text, but till that is
 465          * available use this, and after it is use this as a fallback for older
 466          * kernels.
 467          */
 468         struct process_symbol_args args = { .name = symbol_name, };
 469         union perf_event *event = zalloc((sizeof(event->mmap) +
 470                                           machine->id_hdr_size));
 471         if (event == NULL) {
 472                 pr_debug("Not enough memory synthesizing mmap event "
 473                          "for kernel modules\n");
 474                 return -1;
 475         }
 476
 477         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 478         if (machine__is_host(machine)) {
 479                 /*
 480                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 481                  * see kernel/perf_event.c __perf_event_mmap
 482                  */
 483                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 484                 filename = "/proc/kallsyms";
 485         } else {
 486                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 487                 if (machine__is_default_guest(machine))
 488                         filename = (char *) symbol_conf.default_guest_kallsyms;
 489                 else {
 490                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 491                         filename = path;
 492                 }
 493         }
 494
 495         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
 496                 free(event);
 497                 return -ENOENT;
 498         }
 499
 500         map = machine->vmlinux_maps[MAP__FUNCTION];
 501         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 502                         "%s%s", mmap_name, symbol_name) + 1;
 503         size = PERF_ALIGN(size, sizeof(u64));
 504         event->mmap.header.type = PERF_RECORD_MMAP;
 505         event->mmap.header.size = (sizeof(event->mmap) -
 506                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 507         event->mmap.pgoff = args.start;
 508         event->mmap.start = map->start;
 509         event->mmap.len   = map->end - event->mmap.start;
 510         event->mmap.pid   = machine->pid;
 511
 512         err = process(tool, event, &synth_sample, machine);
 513         free(event);
 514
 515         return err;
 516 }
 517
 518 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 519 {
 520         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
 521 }
 522
 523 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 524                              union perf_event *event,
 525                              struct perf_sample *sample,
 526                              struct machine *machine)
 527 {
 528         return machine__process_comm_event(machine, event, sample);
 529 }
 530
 531 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 532                              union perf_event *event,
 533                              struct perf_sample *sample,
 534                              struct machine *machine)
 535 {
 536         return machine__process_lost_event(machine, event, sample);
 537 }
 538
 539 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 540 {
 541         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
 542                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 543                        event->mmap.len, event->mmap.pgoff,
 544                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 545                        event->mmap.filename);
 546 }
 547
 548 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 549 {
 550         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 551                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
 552                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 553                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 554                        event->mmap2.min, event->mmap2.ino,
 555                        event->mmap2.ino_generation,
 556                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 557                        event->mmap2.filename);
 558 }
 559
 560 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 561                              union perf_event *event,
 562                              struct perf_sample *sample,
 563                              struct machine *machine)
 564 {
 565         return machine__process_mmap_event(machine, event, sample);
 566 }
 567
 568 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 569                              union perf_event *event,
 570                              struct perf_sample *sample,
 571                              struct machine *machine)
 572 {
 573         return machine__process_mmap2_event(machine, event, sample);
 574 }
 575
 576 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 577 {
 578         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 579                        event->fork.pid, event->fork.tid,
 580                        event->fork.ppid, event->fork.ptid);
 581 }
 582
 583 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 584                              union perf_event *event,
 585                              struct perf_sample *sample,
 586                              struct machine *machine)
 587 {
 588         return machine__process_fork_event(machine, event, sample);
 589 }
 590
 591 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 592                              union perf_event *event,
 593                              struct perf_sample *sample,
 594                              struct machine *machine)
 595 {
 596         return machine__process_exit_event(machine, event, sample);
 597 }
 598
 599 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 600 {
 601         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 602                              perf_event__name(event->header.type));
 603
 604         switch (event->header.type) {
 605         case PERF_RECORD_COMM:
 606                 ret += perf_event__fprintf_comm(event, fp);
 607                 break;
 608         case PERF_RECORD_FORK:
 609         case PERF_RECORD_EXIT:
 610                 ret += perf_event__fprintf_task(event, fp);
 611                 break;
 612         case PERF_RECORD_MMAP:
 613                 ret += perf_event__fprintf_mmap(event, fp);
 614                 break;
 615         case PERF_RECORD_MMAP2:
 616                 ret += perf_event__fprintf_mmap2(event, fp);
 617                 break;
 618         default:
 619                 ret += fprintf(fp, "\n");
 620         }
 621
 622         return ret;
 623 }
 624
 625 int perf_event__process(struct perf_tool *tool __maybe_unused,
 626                         union perf_event *event,
 627                         struct perf_sample *sample,
 628                         struct machine *machine)
 629 {
 630         return machine__process_event(machine, event, sample);
 631 }
 632
 633 void thread__find_addr_map(struct thread *thread,
 634                            struct machine *machine, u8 cpumode,
 635                            enum map_type type, u64 addr,
 636                            struct addr_location *al)
 637 {
 638         struct map_groups *mg = &thread->mg;
 639         bool load_map = false;
 640
 641         al->thread = thread;
 642         al->addr = addr;
 643         al->cpumode = cpumode;
 644         al->filtered = false;
 645
 646         if (machine == NULL) {
 647                 al->map = NULL;
 648                 return;
 649         }
 650
 651         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 652                 al->level = 'k';
 653                 mg = &machine->kmaps;
 654                 load_map = true;
 655         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 656                 al->level = '.';
 657         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 658                 al->level = 'g';
 659                 mg = &machine->kmaps;
 660                 load_map = true;
 661         } else {
 662                 /*
 663                  * 'u' means guest os user space.
 664                  * TODO: We don't support guest user space. Might support late.
 665                  */
 666                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
 667                         al->level = 'u';
 668                 else
 669                         al->level = 'H';
 670                 al->map = NULL;
 671
 672                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 673                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 674                         !perf_guest)
 675                         al->filtered = true;
 676                 if ((cpumode == PERF_RECORD_MISC_USER ||
 677                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 678                         !perf_host)
 679                         al->filtered = true;
 680
 681                 return;
 682         }
 683 try_again:
 684         al->map = map_groups__find(mg, type, al->addr);
 685         if (al->map == NULL) {
 686                 /*
 687                  * If this is outside of all known maps, and is a negative
 688                  * address, try to look it up in the kernel dso, as it might be
 689                  * a vsyscall or vdso (which executes in user-mode).
 690                  *
 691                  * XXX This is nasty, we should have a symbol list in the
 692                  * "[vdso]" dso, but for now lets use the old trick of looking
 693                  * in the whole kernel symbol list.
 694                  */
 695                 if ((long long)al->addr < 0 &&
 696                     cpumode == PERF_RECORD_MISC_USER &&
 697                     machine && mg != &machine->kmaps) {
 698                         mg = &machine->kmaps;
 699                         goto try_again;
 700                 }
 701         } else {
 702                 /*
 703                  * Kernel maps might be changed when loading symbols so loading
 704                  * must be done prior to using kernel maps.
 705                  */
 706                 if (load_map)
 707                         map__load(al->map, machine->symbol_filter);
 708                 al->addr = al->map->map_ip(al->map, al->addr);
 709         }
 710 }
 711
 712 void thread__find_addr_location(struct thread *thread, struct machine *machine,
 713                                 u8 cpumode, enum map_type type, u64 addr,
 714                                 struct addr_location *al)
 715 {
 716         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
 717         if (al->map != NULL)
 718                 al->sym = map__find_symbol(al->map, al->addr,
 719                                            machine->symbol_filter);
 720         else
 721                 al->sym = NULL;
 722 }
 723
 724 int perf_event__preprocess_sample(const union perf_event *event,
 725                                   struct machine *machine,
 726                                   struct addr_location *al,
 727                                   struct perf_sample *sample)
 728 {
 729         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 730         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 731                                                         sample->pid);
 732
 733         if (thread == NULL)
 734                 return -1;
 735
 736         if (thread__is_filtered(thread))
 737                 goto out_filtered;
 738
 739         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 740         /*
 741          * Have we already created the kernel maps for this machine?
 742          *
 743          * This should have happened earlier, when we processed the kernel MMAP
 744          * events, but for older perf.data files there was no such thing, so do
 745          * it now.
 746          */
 747         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 748             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 749                 machine__create_kernel_maps(machine);
 750
 751         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 752                               sample->ip, al);
 753         dump_printf(" ...... dso: %s\n",
 754                     al->map ? al->map->dso->long_name :
 755                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 756         al->sym = NULL;
 757         al->cpu = sample->cpu;
 758
 759         if (al->map) {
 760                 struct dso *dso = al->map->dso;
 761
 762                 if (symbol_conf.dso_list &&
 763                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
 764                                                   dso->short_name) ||
 765                                (dso->short_name != dso->long_name &&
 766                                 strlist__has_entry(symbol_conf.dso_list,
 767                                                    dso->long_name)))))
 768                         goto out_filtered;
 769
 770                 al->sym = map__find_symbol(al->map, al->addr,
 771                                            machine->symbol_filter);
 772         }
 773
 774         if (symbol_conf.sym_list &&
 775                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
 776                                                 al->sym->name)))
 777                 goto out_filtered;
 778
 779         return 0;
 780
 781 out_filtered:
 782         al->filtered = true;
 783         return 0;
 784 }