tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include <sys/mman.h>
   3 #include "event.h"
   4 #include "debug.h"
   5 #include "hist.h"
   6 #include "machine.h"
   7 #include "sort.h"
   8 #include "string.h"
   9 #include "strlist.h"
  10 #include "thread.h"
  11 #include "thread_map.h"
  12 #include "symbol/kallsyms.h"
  13
  14 static const char *perf_event__names[] = {
  15         [0]                                     = "TOTAL",
  16         [PERF_RECORD_MMAP]                      = "MMAP",
  17         [PERF_RECORD_MMAP2]                     = "MMAP2",
  18         [PERF_RECORD_LOST]                      = "LOST",
  19         [PERF_RECORD_COMM]                      = "COMM",
  20         [PERF_RECORD_EXIT]                      = "EXIT",
  21         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  22         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  23         [PERF_RECORD_FORK]                      = "FORK",
  24         [PERF_RECORD_READ]                      = "READ",
  25         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  26         [PERF_RECORD_AUX]                       = "AUX",
  27         [PERF_RECORD_ITRACE_START]              = "ITRACE_START",
  28         [PERF_RECORD_LOST_SAMPLES]              = "LOST_SAMPLES",
  29         [PERF_RECORD_SWITCH]                    = "SWITCH",
  30         [PERF_RECORD_SWITCH_CPU_WIDE]           = "SWITCH_CPU_WIDE",
  31         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  32         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  33         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  34         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  35         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  36         [PERF_RECORD_ID_INDEX]                  = "ID_INDEX",
  37         [PERF_RECORD_AUXTRACE_INFO]             = "AUXTRACE_INFO",
  38         [PERF_RECORD_AUXTRACE]                  = "AUXTRACE",
  39         [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
  40 };
  41
  42 const char *perf_event__name(unsigned int id)
  43 {
  44         if (id >= ARRAY_SIZE(perf_event__names))
  45                 return "INVALID";
  46         if (!perf_event__names[id])
  47                 return "UNKNOWN";
  48         return perf_event__names[id];
  49 }
  50
  51 static struct perf_sample synth_sample = {
  52         .pid       = -1,
  53         .tid       = -1,
  54         .time      = -1,
  55         .stream_id = -1,
  56         .cpu       = -1,
  57         .period    = 1,
  58 };
  59
  60 /*
  61  * Assumes that the first 4095 bytes of /proc/pid/stat contains
  62  * the comm, tgid and ppid.
  63  */
  64 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
  65                                     pid_t *tgid, pid_t *ppid)
  66 {
  67         char filename[PATH_MAX];
  68         char bf[4096];
  69         int fd;
  70         size_t size = 0, n;
  71         char *nl, *name, *tgids, *ppids;
  72
  73         *tgid = -1;
  74         *ppid = -1;
  75
  76         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  77
  78         fd = open(filename, O_RDONLY);
  79         if (fd < 0) {
  80                 pr_debug("couldn't open %s\n", filename);
  81                 return -1;
  82         }
  83
  84         n = read(fd, bf, sizeof(bf) - 1);
  85         close(fd);
  86         if (n <= 0) {
  87                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
  88                            pid);
  89                 return -1;
  90         }
  91         bf[n] = '\0';
  92
  93         name = strstr(bf, "Name:");
  94         tgids = strstr(bf, "Tgid:");
  95         ppids = strstr(bf, "PPid:");
  96
  97         if (name) {
  98                 name += 5;  /* strlen("Name:") */
  99
 100                 while (*name && isspace(*name))
 101                         ++name;
 102
 103                 nl = strchr(name, '\n');
 104                 if (nl)
 105                         *nl = '\0';
 106
 107                 size = strlen(name);
 108                 if (size >= len)
 109                         size = len - 1;
 110                 memcpy(comm, name, size);
 111                 comm[size] = '\0';
 112         } else {
 113                 pr_debug("Name: string not found for pid %d\n", pid);
 114         }
 115
 116         if (tgids) {
 117                 tgids += 5;  /* strlen("Tgid:") */
 118                 *tgid = atoi(tgids);
 119         } else {
 120                 pr_debug("Tgid: string not found for pid %d\n", pid);
 121         }
 122
 123         if (ppids) {
 124                 ppids += 5;  /* strlen("PPid:") */
 125                 *ppid = atoi(ppids);
 126         } else {
 127                 pr_debug("PPid: string not found for pid %d\n", pid);
 128         }
 129
 130         return 0;
 131 }
 132
 133 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
 134                                     struct machine *machine,
 135                                     pid_t *tgid, pid_t *ppid)
 136 {
 137         size_t size;
 138
 139         *ppid = -1;
 140
 141         memset(&event->comm, 0, sizeof(event->comm));
 142
 143         if (machine__is_host(machine)) {
 144                 if (perf_event__get_comm_ids(pid, event->comm.comm,
 145                                              sizeof(event->comm.comm),
 146                                              tgid, ppid) != 0) {
 147                         return -1;
 148                 }
 149         } else {
 150                 *tgid = machine->pid;
 151         }
 152
 153         if (*tgid < 0)
 154                 return -1;
 155
 156         event->comm.pid = *tgid;
 157         event->comm.header.type = PERF_RECORD_COMM;
 158
 159         size = strlen(event->comm.comm) + 1;
 160         size = PERF_ALIGN(size, sizeof(u64));
 161         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 162         event->comm.header.size = (sizeof(event->comm) -
 163                                 (sizeof(event->comm.comm) - size) +
 164                                 machine->id_hdr_size);
 165         event->comm.tid = pid;
 166
 167         return 0;
 168 }
 169
 170 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 171                                          union perf_event *event, pid_t pid,
 172                                          perf_event__handler_t process,
 173                                          struct machine *machine)
 174 {
 175         pid_t tgid, ppid;
 176
 177         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
 178                 return -1;
 179
 180         if (process(tool, event, &synth_sample, machine) != 0)
 181                 return -1;
 182
 183         return tgid;
 184 }
 185
 186 static int perf_event__synthesize_fork(struct perf_tool *tool,
 187                                        union perf_event *event,
 188                                        pid_t pid, pid_t tgid, pid_t ppid,
 189                                        perf_event__handler_t process,
 190                                        struct machine *machine)
 191 {
 192         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 193
 194         /*
 195          * for main thread set parent to ppid from status file. For other
 196          * threads set parent pid to main thread. ie., assume main thread
 197          * spawns all threads in a process
 198         */
 199         if (tgid == pid) {
 200                 event->fork.ppid = ppid;
 201                 event->fork.ptid = ppid;
 202         } else {
 203                 event->fork.ppid = tgid;
 204                 event->fork.ptid = tgid;
 205         }
 206         event->fork.pid  = tgid;
 207         event->fork.tid  = pid;
 208         event->fork.header.type = PERF_RECORD_FORK;
 209
 210         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 211
 212         if (process(tool, event, &synth_sample, machine) != 0)
 213                 return -1;
 214
 215         return 0;
 216 }
 217
 218 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 219                                        union perf_event *event,
 220                                        pid_t pid, pid_t tgid,
 221                                        perf_event__handler_t process,
 222                                        struct machine *machine,
 223                                        bool mmap_data,
 224                                        unsigned int proc_map_timeout)
 225 {
 226         char filename[PATH_MAX];
 227         FILE *fp;
 228         unsigned long long t;
 229         bool truncation = false;
 230         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 231         int rc = 0;
 232
 233         if (machine__is_default_guest(machine))
 234                 return 0;
 235
 236         snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
 237                  machine->root_dir, pid);
 238
 239         fp = fopen(filename, "r");
 240         if (fp == NULL) {
 241                 /*
 242                  * We raced with a task exiting - just return:
 243                  */
 244                 pr_debug("couldn't open %s\n", filename);
 245                 return -1;
 246         }
 247
 248         event->header.type = PERF_RECORD_MMAP2;
 249         t = rdclock();
 250
 251         while (1) {
 252                 char bf[BUFSIZ];
 253                 char prot[5];
 254                 char execname[PATH_MAX];
 255                 char anonstr[] = "//anon";
 256                 unsigned int ino;
 257                 size_t size;
 258                 ssize_t n;
 259
 260                 if (fgets(bf, sizeof(bf), fp) == NULL)
 261                         break;
 262
 263                 if ((rdclock() - t) > timeout) {
 264                         pr_warning("Reading %s time out. "
 265                                    "You may want to increase "
 266                                    "the time limit by --proc-map-timeout\n",
 267                                    filename);
 268                         truncation = true;
 269                         goto out;
 270                 }
 271
 272                 /* ensure null termination since stack will be reused. */
 273                 strcpy(execname, "");
 274
 275                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 276                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %s\n",
 277                        &event->mmap2.start, &event->mmap2.len, prot,
 278                        &event->mmap2.pgoff, &event->mmap2.maj,
 279                        &event->mmap2.min,
 280                        &ino, execname);
 281
 282                 /*
 283                  * Anon maps don't have the execname.
 284                  */
 285                 if (n < 7)
 286                         continue;
 287
 288                 event->mmap2.ino = (u64)ino;
 289
 290                 /*
 291                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 292                  */
 293                 if (machine__is_host(machine))
 294                         event->header.misc = PERF_RECORD_MISC_USER;
 295                 else
 296                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 297
 298                 /* map protection and flags bits */
 299                 event->mmap2.prot = 0;
 300                 event->mmap2.flags = 0;
 301                 if (prot[0] == 'r')
 302                         event->mmap2.prot |= PROT_READ;
 303                 if (prot[1] == 'w')
 304                         event->mmap2.prot |= PROT_WRITE;
 305                 if (prot[2] == 'x')
 306                         event->mmap2.prot |= PROT_EXEC;
 307
 308                 if (prot[3] == 's')
 309                         event->mmap2.flags |= MAP_SHARED;
 310                 else
 311                         event->mmap2.flags |= MAP_PRIVATE;
 312
 313                 if (prot[2] != 'x') {
 314                         if (!mmap_data || prot[0] != 'r')
 315                                 continue;
 316
 317                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 318                 }
 319
 320 out:
 321                 if (truncation)
 322                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 323
 324                 if (!strcmp(execname, ""))
 325                         strcpy(execname, anonstr);
 326
 327                 size = strlen(execname) + 1;
 328                 memcpy(event->mmap2.filename, execname, size);
 329                 size = PERF_ALIGN(size, sizeof(u64));
 330                 event->mmap2.len -= event->mmap.start;
 331                 event->mmap2.header.size = (sizeof(event->mmap2) -
 332                                         (sizeof(event->mmap2.filename) - size));
 333                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 334                 event->mmap2.header.size += machine->id_hdr_size;
 335                 event->mmap2.pid = tgid;
 336                 event->mmap2.tid = pid;
 337
 338                 if (process(tool, event, &synth_sample, machine) != 0) {
 339                         rc = -1;
 340                         break;
 341                 }
 342
 343                 if (truncation)
 344                         break;
 345         }
 346
 347         fclose(fp);
 348         return rc;
 349 }
 350
 351 int perf_event__synthesize_modules(struct perf_tool *tool,
 352                                    perf_event__handler_t process,
 353                                    struct machine *machine)
 354 {
 355         int rc = 0;
 356         struct map *pos;
 357         struct map_groups *kmaps = &machine->kmaps;
 358         struct maps *maps = &kmaps->maps[MAP__FUNCTION];
 359         union perf_event *event = zalloc((sizeof(event->mmap) +
 360                                           machine->id_hdr_size));
 361         if (event == NULL) {
 362                 pr_debug("Not enough memory synthesizing mmap event "
 363                          "for kernel modules\n");
 364                 return -1;
 365         }
 366
 367         event->header.type = PERF_RECORD_MMAP;
 368
 369         /*
 370          * kernel uses 0 for user space maps, see kernel/perf_event.c
 371          * __perf_event_mmap
 372          */
 373         if (machine__is_host(machine))
 374                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 375         else
 376                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 377
 378         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 379                 size_t size;
 380
 381                 if (__map__is_kernel(pos))
 382                         continue;
 383
 384                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 385                 event->mmap.header.type = PERF_RECORD_MMAP;
 386                 event->mmap.header.size = (sizeof(event->mmap) -
 387                                         (sizeof(event->mmap.filename) - size));
 388                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 389                 event->mmap.header.size += machine->id_hdr_size;
 390                 event->mmap.start = pos->start;
 391                 event->mmap.len   = pos->end - pos->start;
 392                 event->mmap.pid   = machine->pid;
 393
 394                 memcpy(event->mmap.filename, pos->dso->long_name,
 395                        pos->dso->long_name_len + 1);
 396                 if (process(tool, event, &synth_sample, machine) != 0) {
 397                         rc = -1;
 398                         break;
 399                 }
 400         }
 401
 402         free(event);
 403         return rc;
 404 }
 405
 406 static int __event__synthesize_thread(union perf_event *comm_event,
 407                                       union perf_event *mmap_event,
 408                                       union perf_event *fork_event,
 409                                       pid_t pid, int full,
 410                                           perf_event__handler_t process,
 411                                       struct perf_tool *tool,
 412                                       struct machine *machine,
 413                                       bool mmap_data,
 414                                       unsigned int proc_map_timeout)
 415 {
 416         char filename[PATH_MAX];
 417         DIR *tasks;
 418         struct dirent dirent, *next;
 419         pid_t tgid, ppid;
 420         int rc = 0;
 421
 422         /* special case: only send one comm event using passed in pid */
 423         if (!full) {
 424                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 425                                                    process, machine);
 426
 427                 if (tgid == -1)
 428                         return -1;
 429
 430                 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 431                                                           process, machine, mmap_data,
 432                                                           proc_map_timeout);
 433         }
 434
 435         if (machine__is_default_guest(machine))
 436                 return 0;
 437
 438         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 439                  machine->root_dir, pid);
 440
 441         tasks = opendir(filename);
 442         if (tasks == NULL) {
 443                 pr_debug("couldn't open %s\n", filename);
 444                 return 0;
 445         }
 446
 447         while (!readdir_r(tasks, &dirent, &next) && next) {
 448                 char *end;
 449                 pid_t _pid;
 450
 451                 _pid = strtol(dirent.d_name, &end, 10);
 452                 if (*end)
 453                         continue;
 454
 455                 rc = -1;
 456                 if (perf_event__prepare_comm(comm_event, _pid, machine,
 457                                              &tgid, &ppid) != 0)
 458                         break;
 459
 460                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 461                                                 ppid, process, machine) < 0)
 462                         break;
 463                 /*
 464                  * Send the prepared comm event
 465                  */
 466                 if (process(tool, comm_event, &synth_sample, machine) != 0)
 467                         break;
 468
 469                 rc = 0;
 470                 if (_pid == pid) {
 471                         /* process the parent's maps too */
 472                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 473                                                 process, machine, mmap_data, proc_map_timeout);
 474                         if (rc)
 475                                 break;
 476                 }
 477         }
 478
 479         closedir(tasks);
 480         return rc;
 481 }
 482
 483 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 484                                       struct thread_map *threads,
 485                                       perf_event__handler_t process,
 486                                       struct machine *machine,
 487                                       bool mmap_data,
 488                                       unsigned int proc_map_timeout)
 489 {
 490         union perf_event *comm_event, *mmap_event, *fork_event;
 491         int err = -1, thread, j;
 492
 493         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 494         if (comm_event == NULL)
 495                 goto out;
 496
 497         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 498         if (mmap_event == NULL)
 499                 goto out_free_comm;
 500
 501         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 502         if (fork_event == NULL)
 503                 goto out_free_mmap;
 504
 505         err = 0;
 506         for (thread = 0; thread < threads->nr; ++thread) {
 507                 if (__event__synthesize_thread(comm_event, mmap_event,
 508                                                fork_event,
 509                                                thread_map__pid(threads, thread), 0,
 510                                                process, tool, machine,
 511                                                mmap_data, proc_map_timeout)) {
 512                         err = -1;
 513                         break;
 514                 }
 515
 516                 /*
 517                  * comm.pid is set to thread group id by
 518                  * perf_event__synthesize_comm
 519                  */
 520                 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
 521                         bool need_leader = true;
 522
 523                         /* is thread group leader in thread_map? */
 524                         for (j = 0; j < threads->nr; ++j) {
 525                                 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
 526                                         need_leader = false;
 527                                         break;
 528                                 }
 529                         }
 530
 531                         /* if not, generate events for it */
 532                         if (need_leader &&
 533                             __event__synthesize_thread(comm_event, mmap_event,
 534                                                        fork_event,
 535                                                        comm_event->comm.pid, 0,
 536                                                        process, tool, machine,
 537                                                        mmap_data, proc_map_timeout)) {
 538                                 err = -1;
 539                                 break;
 540                         }
 541                 }
 542         }
 543         free(fork_event);
 544 out_free_mmap:
 545         free(mmap_event);
 546 out_free_comm:
 547         free(comm_event);
 548 out:
 549         return err;
 550 }
 551
 552 int perf_event__synthesize_threads(struct perf_tool *tool,
 553                                    perf_event__handler_t process,
 554                                    struct machine *machine,
 555                                    bool mmap_data,
 556                                    unsigned int proc_map_timeout)
 557 {
 558         DIR *proc;
 559         char proc_path[PATH_MAX];
 560         struct dirent dirent, *next;
 561         union perf_event *comm_event, *mmap_event, *fork_event;
 562         int err = -1;
 563
 564         if (machine__is_default_guest(machine))
 565                 return 0;
 566
 567         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 568         if (comm_event == NULL)
 569                 goto out;
 570
 571         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 572         if (mmap_event == NULL)
 573                 goto out_free_comm;
 574
 575         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 576         if (fork_event == NULL)
 577                 goto out_free_mmap;
 578
 579         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 580         proc = opendir(proc_path);
 581
 582         if (proc == NULL)
 583                 goto out_free_fork;
 584
 585         while (!readdir_r(proc, &dirent, &next) && next) {
 586                 char *end;
 587                 pid_t pid = strtol(dirent.d_name, &end, 10);
 588
 589                 if (*end) /* only interested in proper numerical dirents */
 590                         continue;
 591                 /*
 592                  * We may race with exiting thread, so don't stop just because
 593                  * one thread couldn't be synthesized.
 594                  */
 595                 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
 596                                            1, process, tool, machine, mmap_data,
 597                                            proc_map_timeout);
 598         }
 599
 600         err = 0;
 601         closedir(proc);
 602 out_free_fork:
 603         free(fork_event);
 604 out_free_mmap:
 605         free(mmap_event);
 606 out_free_comm:
 607         free(comm_event);
 608 out:
 609         return err;
 610 }
 611
 612 struct process_symbol_args {
 613         const char *name;
 614         u64        start;
 615 };
 616
 617 static int find_symbol_cb(void *arg, const char *name, char type,
 618                           u64 start)
 619 {
 620         struct process_symbol_args *args = arg;
 621
 622         /*
 623          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 624          * an 'A' to the same address as "_stext".
 625          */
 626         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 627               type == 'A') || strcmp(name, args->name))
 628                 return 0;
 629
 630         args->start = start;
 631         return 1;
 632 }
 633
 634 u64 kallsyms__get_function_start(const char *kallsyms_filename,
 635                                  const char *symbol_name)
 636 {
 637         struct process_symbol_args args = { .name = symbol_name, };
 638
 639         if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
 640                 return 0;
 641
 642         return args.start;
 643 }
 644
 645 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 646                                        perf_event__handler_t process,
 647                                        struct machine *machine)
 648 {
 649         size_t size;
 650         const char *mmap_name;
 651         char name_buff[PATH_MAX];
 652         struct map *map = machine__kernel_map(machine);
 653         struct kmap *kmap;
 654         int err;
 655         union perf_event *event;
 656
 657         if (map == NULL)
 658                 return -1;
 659
 660         /*
 661          * We should get this from /sys/kernel/sections/.text, but till that is
 662          * available use this, and after it is use this as a fallback for older
 663          * kernels.
 664          */
 665         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
 666         if (event == NULL) {
 667                 pr_debug("Not enough memory synthesizing mmap event "
 668                          "for kernel modules\n");
 669                 return -1;
 670         }
 671
 672         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 673         if (machine__is_host(machine)) {
 674                 /*
 675                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 676                  * see kernel/perf_event.c __perf_event_mmap
 677                  */
 678                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 679         } else {
 680                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 681         }
 682
 683         kmap = map__kmap(map);
 684         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 685                         "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
 686         size = PERF_ALIGN(size, sizeof(u64));
 687         event->mmap.header.type = PERF_RECORD_MMAP;
 688         event->mmap.header.size = (sizeof(event->mmap) -
 689                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 690         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
 691         event->mmap.start = map->start;
 692         event->mmap.len   = map->end - event->mmap.start;
 693         event->mmap.pid   = machine->pid;
 694
 695         err = process(tool, event, &synth_sample, machine);
 696         free(event);
 697
 698         return err;
 699 }
 700
 701 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 702 {
 703         const char *s;
 704
 705         if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
 706                 s = " exec";
 707         else
 708                 s = "";
 709
 710         return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
 711 }
 712
 713 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 714                              union perf_event *event,
 715                              struct perf_sample *sample,
 716                              struct machine *machine)
 717 {
 718         return machine__process_comm_event(machine, event, sample);
 719 }
 720
 721 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 722                              union perf_event *event,
 723                              struct perf_sample *sample,
 724                              struct machine *machine)
 725 {
 726         return machine__process_lost_event(machine, event, sample);
 727 }
 728
 729 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
 730                             union perf_event *event,
 731                             struct perf_sample *sample __maybe_unused,
 732                             struct machine *machine)
 733 {
 734         return machine__process_aux_event(machine, event);
 735 }
 736
 737 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
 738                                      union perf_event *event,
 739                                      struct perf_sample *sample __maybe_unused,
 740                                      struct machine *machine)
 741 {
 742         return machine__process_itrace_start_event(machine, event);
 743 }
 744
 745 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
 746                                      union perf_event *event,
 747                                      struct perf_sample *sample,
 748                                      struct machine *machine)
 749 {
 750         return machine__process_lost_samples_event(machine, event, sample);
 751 }
 752
 753 int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
 754                                union perf_event *event,
 755                                struct perf_sample *sample __maybe_unused,
 756                                struct machine *machine)
 757 {
 758         return machine__process_switch_event(machine, event);
 759 }
 760
 761 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 762 {
 763         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
 764                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 765                        event->mmap.len, event->mmap.pgoff,
 766                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 767                        event->mmap.filename);
 768 }
 769
 770 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 771 {
 772         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 773                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
 774                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 775                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 776                        event->mmap2.min, event->mmap2.ino,
 777                        event->mmap2.ino_generation,
 778                        (event->mmap2.prot & PROT_READ) ? 'r' : '-',
 779                        (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
 780                        (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
 781                        (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
 782                        event->mmap2.filename);
 783 }
 784
 785 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 786                              union perf_event *event,
 787                              struct perf_sample *sample,
 788                              struct machine *machine)
 789 {
 790         return machine__process_mmap_event(machine, event, sample);
 791 }
 792
 793 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 794                              union perf_event *event,
 795                              struct perf_sample *sample,
 796                              struct machine *machine)
 797 {
 798         return machine__process_mmap2_event(machine, event, sample);
 799 }
 800
 801 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 802 {
 803         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 804                        event->fork.pid, event->fork.tid,
 805                        event->fork.ppid, event->fork.ptid);
 806 }
 807
 808 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 809                              union perf_event *event,
 810                              struct perf_sample *sample,
 811                              struct machine *machine)
 812 {
 813         return machine__process_fork_event(machine, event, sample);
 814 }
 815
 816 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 817                              union perf_event *event,
 818                              struct perf_sample *sample,
 819                              struct machine *machine)
 820 {
 821         return machine__process_exit_event(machine, event, sample);
 822 }
 823
 824 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
 825 {
 826         return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s]\n",
 827                        event->aux.aux_offset, event->aux.aux_size,
 828                        event->aux.flags,
 829                        event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
 830                        event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "");
 831 }
 832
 833 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
 834 {
 835         return fprintf(fp, " pid: %u tid: %u\n",
 836                        event->itrace_start.pid, event->itrace_start.tid);
 837 }
 838
 839 size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
 840 {
 841         bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
 842         const char *in_out = out ? "OUT" : "IN ";
 843
 844         if (event->header.type == PERF_RECORD_SWITCH)
 845                 return fprintf(fp, " %s\n", in_out);
 846
 847         return fprintf(fp, " %s  %s pid/tid: %5u/%-5u\n",
 848                        in_out, out ? "next" : "prev",
 849                        event->context_switch.next_prev_pid,
 850                        event->context_switch.next_prev_tid);
 851 }
 852
 853 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 854 {
 855         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 856                              perf_event__name(event->header.type));
 857
 858         switch (event->header.type) {
 859         case PERF_RECORD_COMM:
 860                 ret += perf_event__fprintf_comm(event, fp);
 861                 break;
 862         case PERF_RECORD_FORK:
 863         case PERF_RECORD_EXIT:
 864                 ret += perf_event__fprintf_task(event, fp);
 865                 break;
 866         case PERF_RECORD_MMAP:
 867                 ret += perf_event__fprintf_mmap(event, fp);
 868                 break;
 869         case PERF_RECORD_MMAP2:
 870                 ret += perf_event__fprintf_mmap2(event, fp);
 871                 break;
 872         case PERF_RECORD_AUX:
 873                 ret += perf_event__fprintf_aux(event, fp);
 874                 break;
 875         case PERF_RECORD_ITRACE_START:
 876                 ret += perf_event__fprintf_itrace_start(event, fp);
 877                 break;
 878         case PERF_RECORD_SWITCH:
 879         case PERF_RECORD_SWITCH_CPU_WIDE:
 880                 ret += perf_event__fprintf_switch(event, fp);
 881                 break;
 882         default:
 883                 ret += fprintf(fp, "\n");
 884         }
 885
 886         return ret;
 887 }
 888
 889 int perf_event__process(struct perf_tool *tool __maybe_unused,
 890                         union perf_event *event,
 891                         struct perf_sample *sample,
 892                         struct machine *machine)
 893 {
 894         return machine__process_event(machine, event, sample);
 895 }
 896
 897 void thread__find_addr_map(struct thread *thread, u8 cpumode,
 898                            enum map_type type, u64 addr,
 899                            struct addr_location *al)
 900 {
 901         struct map_groups *mg = thread->mg;
 902         struct machine *machine = mg->machine;
 903         bool load_map = false;
 904
 905         al->machine = machine;
 906         al->thread = thread;
 907         al->addr = addr;
 908         al->cpumode = cpumode;
 909         al->filtered = 0;
 910
 911         if (machine == NULL) {
 912                 al->map = NULL;
 913                 return;
 914         }
 915
 916         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 917                 al->level = 'k';
 918                 mg = &machine->kmaps;
 919                 load_map = true;
 920         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 921                 al->level = '.';
 922         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 923                 al->level = 'g';
 924                 mg = &machine->kmaps;
 925                 load_map = true;
 926         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
 927                 al->level = 'u';
 928         } else {
 929                 al->level = 'H';
 930                 al->map = NULL;
 931
 932                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 933                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 934                         !perf_guest)
 935                         al->filtered |= (1 << HIST_FILTER__GUEST);
 936                 if ((cpumode == PERF_RECORD_MISC_USER ||
 937                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 938                         !perf_host)
 939                         al->filtered |= (1 << HIST_FILTER__HOST);
 940
 941                 return;
 942         }
 943 try_again:
 944         al->map = map_groups__find(mg, type, al->addr);
 945         if (al->map == NULL) {
 946                 /*
 947                  * If this is outside of all known maps, and is a negative
 948                  * address, try to look it up in the kernel dso, as it might be
 949                  * a vsyscall or vdso (which executes in user-mode).
 950                  *
 951                  * XXX This is nasty, we should have a symbol list in the
 952                  * "[vdso]" dso, but for now lets use the old trick of looking
 953                  * in the whole kernel symbol list.
 954                  */
 955                 if (cpumode == PERF_RECORD_MISC_USER && machine &&
 956                     mg != &machine->kmaps &&
 957                     machine__kernel_ip(machine, al->addr)) {
 958                         mg = &machine->kmaps;
 959                         load_map = true;
 960                         goto try_again;
 961                 }
 962         } else {
 963                 /*
 964                  * Kernel maps might be changed when loading symbols so loading
 965                  * must be done prior to using kernel maps.
 966                  */
 967                 if (load_map)
 968                         map__load(al->map, machine->symbol_filter);
 969                 al->addr = al->map->map_ip(al->map, al->addr);
 970         }
 971 }
 972
 973 void thread__find_addr_location(struct thread *thread,
 974                                 u8 cpumode, enum map_type type, u64 addr,
 975                                 struct addr_location *al)
 976 {
 977         thread__find_addr_map(thread, cpumode, type, addr, al);
 978         if (al->map != NULL)
 979                 al->sym = map__find_symbol(al->map, al->addr,
 980                                            thread->mg->machine->symbol_filter);
 981         else
 982                 al->sym = NULL;
 983 }
 984
 985 /*
 986  * Callers need to drop the reference to al->thread, obtained in
 987  * machine__findnew_thread()
 988  */
 989 int perf_event__preprocess_sample(const union perf_event *event,
 990                                   struct machine *machine,
 991                                   struct addr_location *al,
 992                                   struct perf_sample *sample)
 993 {
 994         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 995         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 996                                                         sample->tid);
 997
 998         if (thread == NULL)
 999                 return -1;
1000
1001         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
1002         /*
1003          * Have we already created the kernel maps for this machine?
1004          *
1005          * This should have happened earlier, when we processed the kernel MMAP
1006          * events, but for older perf.data files there was no such thing, so do
1007          * it now.
1008          */
1009         if (cpumode == PERF_RECORD_MISC_KERNEL &&
1010             machine__kernel_map(machine) == NULL)
1011                 machine__create_kernel_maps(machine);
1012
1013         thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->ip, al);
1014         dump_printf(" ...... dso: %s\n",
1015                     al->map ? al->map->dso->long_name :
1016                         al->level == 'H' ? "[hypervisor]" : "<not found>");
1017
1018         if (thread__is_filtered(thread))
1019                 al->filtered |= (1 << HIST_FILTER__THREAD);
1020
1021         al->sym = NULL;
1022         al->cpu = sample->cpu;
1023         al->socket = -1;
1024
1025         if (al->cpu >= 0) {
1026                 struct perf_env *env = machine->env;
1027
1028                 if (env && env->cpu)
1029                         al->socket = env->cpu[al->cpu].socket_id;
1030         }
1031
1032         if (al->map) {
1033                 struct dso *dso = al->map->dso;
1034
1035                 if (symbol_conf.dso_list &&
1036                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1037                                                   dso->short_name) ||
1038                                (dso->short_name != dso->long_name &&
1039                                 strlist__has_entry(symbol_conf.dso_list,
1040                                                    dso->long_name))))) {
1041                         al->filtered |= (1 << HIST_FILTER__DSO);
1042                 }
1043
1044                 al->sym = map__find_symbol(al->map, al->addr,
1045                                            machine->symbol_filter);
1046         }
1047
1048         if (symbol_conf.sym_list &&
1049                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1050                                                 al->sym->name))) {
1051                 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1052         }
1053
1054         return 0;
1055 }
1056
1057 /*
1058  * The preprocess_sample method will return with reference counts for the
1059  * in it, when done using (and perhaps getting ref counts if needing to
1060  * keep a pointer to one of those entries) it must be paired with
1061  * addr_location__put(), so that the refcounts can be decremented.
1062  */
1063 void addr_location__put(struct addr_location *al)
1064 {
1065         thread__zput(al->thread);
1066 }
1067
1068 bool is_bts_event(struct perf_event_attr *attr)
1069 {
1070         return attr->type == PERF_TYPE_HARDWARE &&
1071                (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1072                attr->sample_period == 1;
1073 }
1074
1075 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1076 {
1077         if (attr->type == PERF_TYPE_SOFTWARE &&
1078             (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1079              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1080              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1081                 return true;
1082
1083         if (is_bts_event(attr))
1084                 return true;
1085
1086         return false;
1087 }
1088
1089 void perf_event__preprocess_sample_addr(union perf_event *event,
1090                                         struct perf_sample *sample,
1091                                         struct thread *thread,
1092                                         struct addr_location *al)
1093 {
1094         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1095
1096         thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->addr, al);
1097         if (!al->map)
1098                 thread__find_addr_map(thread, cpumode, MAP__VARIABLE,
1099                                       sample->addr, al);
1100
1101         al->cpu = sample->cpu;
1102         al->sym = NULL;
1103
1104         if (al->map)
1105                 al->sym = map__find_symbol(al->map, al->addr, NULL);
1106 }