tools/perf/util/session.c

   1 #define _FILE_OFFSET_BITS 64
   2
   3 #include <linux/kernel.h>
   4
   5 #include <byteswap.h>
   6 #include <unistd.h>
   7 #include <sys/types.h>
   8 #include <sys/mman.h>
   9
  10 #include "session.h"
  11 #include "sort.h"
  12 #include "util.h"
  13
  14 static int perf_session__open(struct perf_session *self, bool force)
  15 {
  16         struct stat input_stat;
  17
  18         if (!strcmp(self->filename, "-")) {
  19                 self->fd_pipe = true;
  20                 self->fd = STDIN_FILENO;
  21
  22                 if (perf_header__read(self, self->fd) < 0)
  23                         pr_err("incompatible file format");
  24
  25                 return 0;
  26         }
  27
  28         self->fd = open(self->filename, O_RDONLY);
  29         if (self->fd < 0) {
  30                 int err = errno;
  31
  32                 pr_err("failed to open %s: %s", self->filename, strerror(err));
  33                 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
  34                         pr_err("  (try 'perf record' first)");
  35                 pr_err("\n");
  36                 return -errno;
  37         }
  38
  39         if (fstat(self->fd, &input_stat) < 0)
  40                 goto out_close;
  41
  42         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
  43                 pr_err("file %s not owned by current user or root\n",
  44                        self->filename);
  45                 goto out_close;
  46         }
  47
  48         if (!input_stat.st_size) {
  49                 pr_info("zero-sized file (%s), nothing to do!\n",
  50                         self->filename);
  51                 goto out_close;
  52         }
  53
  54         if (perf_header__read(self, self->fd) < 0) {
  55                 pr_err("incompatible file format");
  56                 goto out_close;
  57         }
  58
  59         self->size = input_stat.st_size;
  60         return 0;
  61
  62 out_close:
  63         close(self->fd);
  64         self->fd = -1;
  65         return -1;
  66 }
  67
  68 void perf_session__update_sample_type(struct perf_session *self)
  69 {
  70         self->sample_type = perf_header__sample_type(&self->header);
  71 }
  72
  73 int perf_session__create_kernel_maps(struct perf_session *self)
  74 {
  75         int ret = machine__create_kernel_maps(&self->host_machine);
  76
  77         if (ret >= 0)
  78                 ret = machines__create_guest_kernel_maps(&self->machines);
  79         return ret;
  80 }
  81
  82 static void perf_session__destroy_kernel_maps(struct perf_session *self)
  83 {
  84         machine__destroy_kernel_maps(&self->host_machine);
  85         machines__destroy_guest_kernel_maps(&self->machines);
  86 }
  87
  88 struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe)
  89 {
  90         size_t len = filename ? strlen(filename) + 1 : 0;
  91         struct perf_session *self = zalloc(sizeof(*self) + len);
  92
  93         if (self == NULL)
  94                 goto out;
  95
  96         if (perf_header__init(&self->header) < 0)
  97                 goto out_free;
  98
  99         memcpy(self->filename, filename, len);
 100         self->threads = RB_ROOT;
 101         INIT_LIST_HEAD(&self->dead_threads);
 102         self->hists_tree = RB_ROOT;
 103         self->last_match = NULL;
 104         self->mmap_window = 32;
 105         self->machines = RB_ROOT;
 106         self->repipe = repipe;
 107         INIT_LIST_HEAD(&self->ordered_samples.samples);
 108         machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 109
 110         if (mode == O_RDONLY) {
 111                 if (perf_session__open(self, force) < 0)
 112                         goto out_delete;
 113         } else if (mode == O_WRONLY) {
 114                 /*
 115                  * In O_RDONLY mode this will be performed when reading the
 116                  * kernel MMAP event, in event__process_mmap().
 117                  */
 118                 if (perf_session__create_kernel_maps(self) < 0)
 119                         goto out_delete;
 120         }
 121
 122         perf_session__update_sample_type(self);
 123 out:
 124         return self;
 125 out_free:
 126         free(self);
 127         return NULL;
 128 out_delete:
 129         perf_session__delete(self);
 130         return NULL;
 131 }
 132
 133 static void perf_session__delete_dead_threads(struct perf_session *self)
 134 {
 135         struct thread *n, *t;
 136
 137         list_for_each_entry_safe(t, n, &self->dead_threads, node) {
 138                 list_del(&t->node);
 139                 thread__delete(t);
 140         }
 141 }
 142
 143 static void perf_session__delete_threads(struct perf_session *self)
 144 {
 145         struct rb_node *nd = rb_first(&self->threads);
 146
 147         while (nd) {
 148                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 149
 150                 rb_erase(&t->rb_node, &self->threads);
 151                 nd = rb_next(nd);
 152                 thread__delete(t);
 153         }
 154 }
 155
 156 void perf_session__delete(struct perf_session *self)
 157 {
 158         perf_header__exit(&self->header);
 159         perf_session__destroy_kernel_maps(self);
 160         perf_session__delete_dead_threads(self);
 161         perf_session__delete_threads(self);
 162         machine__exit(&self->host_machine);
 163         close(self->fd);
 164         free(self);
 165 }
 166
 167 void perf_session__remove_thread(struct perf_session *self, struct thread *th)
 168 {
 169         self->last_match = NULL;
 170         rb_erase(&th->rb_node, &self->threads);
 171         /*
 172          * We may have references to this thread, for instance in some hist_entry
 173          * instances, so just move them to a separate list.
 174          */
 175         list_add_tail(&th->node, &self->dead_threads);
 176 }
 177
 178 static bool symbol__match_parent_regex(struct symbol *sym)
 179 {
 180         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 181                 return 1;
 182
 183         return 0;
 184 }
 185
 186 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self,
 187                                                    struct thread *thread,
 188                                                    struct ip_callchain *chain,
 189                                                    struct symbol **parent)
 190 {
 191         u8 cpumode = PERF_RECORD_MISC_USER;
 192         unsigned int i;
 193         struct map_symbol *syms = calloc(chain->nr, sizeof(*syms));
 194
 195         if (!syms)
 196                 return NULL;
 197
 198         for (i = 0; i < chain->nr; i++) {
 199                 u64 ip = chain->ips[i];
 200                 struct addr_location al;
 201
 202                 if (ip >= PERF_CONTEXT_MAX) {
 203                         switch (ip) {
 204                         case PERF_CONTEXT_HV:
 205                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 206                         case PERF_CONTEXT_KERNEL:
 207                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 208                         case PERF_CONTEXT_USER:
 209                                 cpumode = PERF_RECORD_MISC_USER;        break;
 210                         default:
 211                                 break;
 212                         }
 213                         continue;
 214                 }
 215
 216                 al.filtered = false;
 217                 thread__find_addr_location(thread, self, cpumode,
 218                                 MAP__FUNCTION, thread->pid, ip, &al, NULL);
 219                 if (al.sym != NULL) {
 220                         if (sort__has_parent && !*parent &&
 221                             symbol__match_parent_regex(al.sym))
 222                                 *parent = al.sym;
 223                         if (!symbol_conf.use_callchain)
 224                                 break;
 225                         syms[i].map = al.map;
 226                         syms[i].sym = al.sym;
 227                 }
 228         }
 229
 230         return syms;
 231 }
 232
 233 static int process_event_stub(event_t *event __used,
 234                               struct perf_session *session __used)
 235 {
 236         dump_printf(": unhandled!\n");
 237         return 0;
 238 }
 239
 240 static int process_finished_round_stub(event_t *event __used,
 241                                        struct perf_session *session __used,
 242                                        struct perf_event_ops *ops __used)
 243 {
 244         dump_printf(": unhandled!\n");
 245         return 0;
 246 }
 247
 248 static int process_finished_round(event_t *event,
 249                                   struct perf_session *session,
 250                                   struct perf_event_ops *ops);
 251
 252 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
 253 {
 254         if (handler->sample == NULL)
 255                 handler->sample = process_event_stub;
 256         if (handler->mmap == NULL)
 257                 handler->mmap = process_event_stub;
 258         if (handler->comm == NULL)
 259                 handler->comm = process_event_stub;
 260         if (handler->fork == NULL)
 261                 handler->fork = process_event_stub;
 262         if (handler->exit == NULL)
 263                 handler->exit = process_event_stub;
 264         if (handler->lost == NULL)
 265                 handler->lost = event__process_lost;
 266         if (handler->read == NULL)
 267                 handler->read = process_event_stub;
 268         if (handler->throttle == NULL)
 269                 handler->throttle = process_event_stub;
 270         if (handler->unthrottle == NULL)
 271                 handler->unthrottle = process_event_stub;
 272         if (handler->attr == NULL)
 273                 handler->attr = process_event_stub;
 274         if (handler->event_type == NULL)
 275                 handler->event_type = process_event_stub;
 276         if (handler->tracing_data == NULL)
 277                 handler->tracing_data = process_event_stub;
 278         if (handler->build_id == NULL)
 279                 handler->build_id = process_event_stub;
 280         if (handler->finished_round == NULL) {
 281                 if (handler->ordered_samples)
 282                         handler->finished_round = process_finished_round;
 283                 else
 284                         handler->finished_round = process_finished_round_stub;
 285         }
 286 }
 287
 288 void mem_bswap_64(void *src, int byte_size)
 289 {
 290         u64 *m = src;
 291
 292         while (byte_size > 0) {
 293                 *m = bswap_64(*m);
 294                 byte_size -= sizeof(u64);
 295                 ++m;
 296         }
 297 }
 298
 299 static void event__all64_swap(event_t *self)
 300 {
 301         struct perf_event_header *hdr = &self->header;
 302         mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
 303 }
 304
 305 static void event__comm_swap(event_t *self)
 306 {
 307         self->comm.pid = bswap_32(self->comm.pid);
 308         self->comm.tid = bswap_32(self->comm.tid);
 309 }
 310
 311 static void event__mmap_swap(event_t *self)
 312 {
 313         self->mmap.pid   = bswap_32(self->mmap.pid);
 314         self->mmap.tid   = bswap_32(self->mmap.tid);
 315         self->mmap.start = bswap_64(self->mmap.start);
 316         self->mmap.len   = bswap_64(self->mmap.len);
 317         self->mmap.pgoff = bswap_64(self->mmap.pgoff);
 318 }
 319
 320 static void event__task_swap(event_t *self)
 321 {
 322         self->fork.pid  = bswap_32(self->fork.pid);
 323         self->fork.tid  = bswap_32(self->fork.tid);
 324         self->fork.ppid = bswap_32(self->fork.ppid);
 325         self->fork.ptid = bswap_32(self->fork.ptid);
 326         self->fork.time = bswap_64(self->fork.time);
 327 }
 328
 329 static void event__read_swap(event_t *self)
 330 {
 331         self->read.pid          = bswap_32(self->read.pid);
 332         self->read.tid          = bswap_32(self->read.tid);
 333         self->read.value        = bswap_64(self->read.value);
 334         self->read.time_enabled = bswap_64(self->read.time_enabled);
 335         self->read.time_running = bswap_64(self->read.time_running);
 336         self->read.id           = bswap_64(self->read.id);
 337 }
 338
 339 static void event__attr_swap(event_t *self)
 340 {
 341         size_t size;
 342
 343         self->attr.attr.type            = bswap_32(self->attr.attr.type);
 344         self->attr.attr.size            = bswap_32(self->attr.attr.size);
 345         self->attr.attr.config          = bswap_64(self->attr.attr.config);
 346         self->attr.attr.sample_period   = bswap_64(self->attr.attr.sample_period);
 347         self->attr.attr.sample_type     = bswap_64(self->attr.attr.sample_type);
 348         self->attr.attr.read_format     = bswap_64(self->attr.attr.read_format);
 349         self->attr.attr.wakeup_events   = bswap_32(self->attr.attr.wakeup_events);
 350         self->attr.attr.bp_type         = bswap_32(self->attr.attr.bp_type);
 351         self->attr.attr.bp_addr         = bswap_64(self->attr.attr.bp_addr);
 352         self->attr.attr.bp_len          = bswap_64(self->attr.attr.bp_len);
 353
 354         size = self->header.size;
 355         size -= (void *)&self->attr.id - (void *)self;
 356         mem_bswap_64(self->attr.id, size);
 357 }
 358
 359 static void event__event_type_swap(event_t *self)
 360 {
 361         self->event_type.event_type.event_id =
 362                 bswap_64(self->event_type.event_type.event_id);
 363 }
 364
 365 static void event__tracing_data_swap(event_t *self)
 366 {
 367         self->tracing_data.size = bswap_32(self->tracing_data.size);
 368 }
 369
 370 typedef void (*event__swap_op)(event_t *self);
 371
 372 static event__swap_op event__swap_ops[] = {
 373         [PERF_RECORD_MMAP]   = event__mmap_swap,
 374         [PERF_RECORD_COMM]   = event__comm_swap,
 375         [PERF_RECORD_FORK]   = event__task_swap,
 376         [PERF_RECORD_EXIT]   = event__task_swap,
 377         [PERF_RECORD_LOST]   = event__all64_swap,
 378         [PERF_RECORD_READ]   = event__read_swap,
 379         [PERF_RECORD_SAMPLE] = event__all64_swap,
 380         [PERF_RECORD_HEADER_ATTR]   = event__attr_swap,
 381         [PERF_RECORD_HEADER_EVENT_TYPE]   = event__event_type_swap,
 382         [PERF_RECORD_HEADER_TRACING_DATA]   = event__tracing_data_swap,
 383         [PERF_RECORD_HEADER_BUILD_ID]   = NULL,
 384         [PERF_RECORD_HEADER_MAX]    = NULL,
 385 };
 386
 387 struct sample_queue {
 388         u64                     timestamp;
 389         event_t                 *event;
 390         struct list_head        list;
 391 };
 392
 393 static void flush_sample_queue(struct perf_session *s,
 394                                struct perf_event_ops *ops)
 395 {
 396         struct ordered_samples *os = &s->ordered_samples;
 397         struct list_head *head = &os->samples;
 398         struct sample_queue *tmp, *iter;
 399         u64 limit = os->next_flush;
 400         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 401
 402         if (!ops->ordered_samples || !limit)
 403                 return;
 404
 405         list_for_each_entry_safe(iter, tmp, head, list) {
 406                 if (iter->timestamp > limit)
 407                         break;
 408
 409                 ops->sample(iter->event, s);
 410
 411                 os->last_flush = iter->timestamp;
 412                 list_del(&iter->list);
 413                 free(iter->event);
 414                 free(iter);
 415         }
 416
 417         if (list_empty(head)) {
 418                 os->last_sample = NULL;
 419         } else if (last_ts <= limit) {
 420                 os->last_sample =
 421                         list_entry(head->prev, struct sample_queue, list);
 422         }
 423 }
 424
 425 /*
 426  * When perf record finishes a pass on every buffers, it records this pseudo
 427  * event.
 428  * We record the max timestamp t found in the pass n.
 429  * Assuming these timestamps are monotonic across cpus, we know that if
 430  * a buffer still has events with timestamps below t, they will be all
 431  * available and then read in the pass n + 1.
 432  * Hence when we start to read the pass n + 2, we can safely flush every
 433  * events with timestamps below t.
 434  *
 435  *    ============ PASS n =================
 436  *       CPU 0         |   CPU 1
 437  *                     |
 438  *    cnt1 timestamps  |   cnt2 timestamps
 439  *          1          |         2
 440  *          2          |         3
 441  *          -          |         4  <--- max recorded
 442  *
 443  *    ============ PASS n + 1 ==============
 444  *       CPU 0         |   CPU 1
 445  *                     |
 446  *    cnt1 timestamps  |   cnt2 timestamps
 447  *          3          |         5
 448  *          4          |         6
 449  *          5          |         7 <---- max recorded
 450  *
 451  *      Flush every events below timestamp 4
 452  *
 453  *    ============ PASS n + 2 ==============
 454  *       CPU 0         |   CPU 1
 455  *                     |
 456  *    cnt1 timestamps  |   cnt2 timestamps
 457  *          6          |         8
 458  *          7          |         9
 459  *          -          |         10
 460  *
 461  *      Flush every events below timestamp 7
 462  *      etc...
 463  */
 464 static int process_finished_round(event_t *event __used,
 465                                   struct perf_session *session,
 466                                   struct perf_event_ops *ops)
 467 {
 468         flush_sample_queue(session, ops);
 469         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 470
 471         return 0;
 472 }
 473
 474 /* The queue is ordered by time */
 475 static void __queue_sample_event(struct sample_queue *new,
 476                                  struct perf_session *s)
 477 {
 478         struct ordered_samples *os = &s->ordered_samples;
 479         struct sample_queue *sample = os->last_sample;
 480         u64 timestamp = new->timestamp;
 481         struct list_head *p;
 482
 483         os->last_sample = new;
 484
 485         if (!sample) {
 486                 list_add(&new->list, &os->samples);
 487                 os->max_timestamp = timestamp;
 488                 return;
 489         }
 490
 491         /*
 492          * last_sample might point to some random place in the list as it's
 493          * the last queued event. We expect that the new event is close to
 494          * this.
 495          */
 496         if (sample->timestamp <= timestamp) {
 497                 while (sample->timestamp <= timestamp) {
 498                         p = sample->list.next;
 499                         if (p == &os->samples) {
 500                                 list_add_tail(&new->list, &os->samples);
 501                                 os->max_timestamp = timestamp;
 502                                 return;
 503                         }
 504                         sample = list_entry(p, struct sample_queue, list);
 505                 }
 506                 list_add_tail(&new->list, &sample->list);
 507         } else {
 508                 while (sample->timestamp > timestamp) {
 509                         p = sample->list.prev;
 510                         if (p == &os->samples) {
 511                                 list_add(&new->list, &os->samples);
 512                                 return;
 513                         }
 514                         sample = list_entry(p, struct sample_queue, list);
 515                 }
 516                 list_add(&new->list, &sample->list);
 517         }
 518 }
 519
 520 static int queue_sample_event(event_t *event, struct sample_data *data,
 521                               struct perf_session *s)
 522 {
 523         u64 timestamp = data->time;
 524         struct sample_queue *new;
 525
 526
 527         if (timestamp < s->ordered_samples.last_flush) {
 528                 printf("Warning: Timestamp below last timeslice flush\n");
 529                 return -EINVAL;
 530         }
 531
 532         new = malloc(sizeof(*new));
 533         if (!new)
 534                 return -ENOMEM;
 535
 536         new->timestamp = timestamp;
 537
 538         new->event = malloc(event->header.size);
 539         if (!new->event) {
 540                 free(new);
 541                 return -ENOMEM;
 542         }
 543
 544         memcpy(new->event, event, event->header.size);
 545
 546         __queue_sample_event(new, s);
 547
 548         return 0;
 549 }
 550
 551 static int perf_session__process_sample(event_t *event, struct perf_session *s,
 552                                         struct perf_event_ops *ops)
 553 {
 554         struct sample_data data;
 555
 556         if (!ops->ordered_samples)
 557                 return ops->sample(event, s);
 558
 559         bzero(&data, sizeof(struct sample_data));
 560         event__parse_sample(event, s->sample_type, &data);
 561
 562         queue_sample_event(event, &data, s);
 563
 564         return 0;
 565 }
 566
 567 static int perf_session__process_event(struct perf_session *self,
 568                                        event_t *event,
 569                                        struct perf_event_ops *ops,
 570                                        u64 file_offset)
 571 {
 572         trace_event(event);
 573
 574         if (event->header.type < PERF_RECORD_HEADER_MAX) {
 575                 dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
 576                             file_offset, event->header.size,
 577                             event__name[event->header.type]);
 578                 hists__inc_nr_events(&self->hists, event->header.type);
 579         }
 580
 581         if (self->header.needs_swap && event__swap_ops[event->header.type])
 582                 event__swap_ops[event->header.type](event);
 583
 584         switch (event->header.type) {
 585         case PERF_RECORD_SAMPLE:
 586                 return perf_session__process_sample(event, self, ops);
 587         case PERF_RECORD_MMAP:
 588                 return ops->mmap(event, self);
 589         case PERF_RECORD_COMM:
 590                 return ops->comm(event, self);
 591         case PERF_RECORD_FORK:
 592                 return ops->fork(event, self);
 593         case PERF_RECORD_EXIT:
 594                 return ops->exit(event, self);
 595         case PERF_RECORD_LOST:
 596                 return ops->lost(event, self);
 597         case PERF_RECORD_READ:
 598                 return ops->read(event, self);
 599         case PERF_RECORD_THROTTLE:
 600                 return ops->throttle(event, self);
 601         case PERF_RECORD_UNTHROTTLE:
 602                 return ops->unthrottle(event, self);
 603         case PERF_RECORD_HEADER_ATTR:
 604                 return ops->attr(event, self);
 605         case PERF_RECORD_HEADER_EVENT_TYPE:
 606                 return ops->event_type(event, self);
 607         case PERF_RECORD_HEADER_TRACING_DATA:
 608                 /* setup for reading amidst mmap */
 609                 lseek(self->fd, file_offset, SEEK_SET);
 610                 return ops->tracing_data(event, self);
 611         case PERF_RECORD_HEADER_BUILD_ID:
 612                 return ops->build_id(event, self);
 613         case PERF_RECORD_FINISHED_ROUND:
 614                 return ops->finished_round(event, self, ops);
 615         default:
 616                 ++self->hists.stats.nr_unknown_events;
 617                 return -1;
 618         }
 619 }
 620
 621 void perf_event_header__bswap(struct perf_event_header *self)
 622 {
 623         self->type = bswap_32(self->type);
 624         self->misc = bswap_16(self->misc);
 625         self->size = bswap_16(self->size);
 626 }
 627
 628 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
 629 {
 630         struct thread *thread = perf_session__findnew(self, 0);
 631
 632         if (thread == NULL || thread__set_comm(thread, "swapper")) {
 633                 pr_err("problem inserting idle task.\n");
 634                 thread = NULL;
 635         }
 636
 637         return thread;
 638 }
 639
 640 int do_read(int fd, void *buf, size_t size)
 641 {
 642         void *buf_start = buf;
 643
 644         while (size) {
 645                 int ret = read(fd, buf, size);
 646
 647                 if (ret <= 0)
 648                         return ret;
 649
 650                 size -= ret;
 651                 buf += ret;
 652         }
 653
 654         return buf - buf_start;
 655 }
 656
 657 #define session_done()  (*(volatile int *)(&session_done))
 658 volatile int session_done;
 659
 660 static int __perf_session__process_pipe_events(struct perf_session *self,
 661                                                struct perf_event_ops *ops)
 662 {
 663         event_t event;
 664         uint32_t size;
 665         int skip = 0;
 666         u64 head;
 667         int err;
 668         void *p;
 669
 670         perf_event_ops__fill_defaults(ops);
 671
 672         head = 0;
 673 more:
 674         err = do_read(self->fd, &event, sizeof(struct perf_event_header));
 675         if (err <= 0) {
 676                 if (err == 0)
 677                         goto done;
 678
 679                 pr_err("failed to read event header\n");
 680                 goto out_err;
 681         }
 682
 683         if (self->header.needs_swap)
 684                 perf_event_header__bswap(&event.header);
 685
 686         size = event.header.size;
 687         if (size == 0)
 688                 size = 8;
 689
 690         p = &event;
 691         p += sizeof(struct perf_event_header);
 692
 693         if (size - sizeof(struct perf_event_header)) {
 694                 err = do_read(self->fd, p,
 695                               size - sizeof(struct perf_event_header));
 696                 if (err <= 0) {
 697                         if (err == 0) {
 698                                 pr_err("unexpected end of event stream\n");
 699                                 goto done;
 700                         }
 701
 702                         pr_err("failed to read event data\n");
 703                         goto out_err;
 704                 }
 705         }
 706
 707         if (size == 0 ||
 708             (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
 709                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 710                             head, event.header.size, event.header.type);
 711                 /*
 712                  * assume we lost track of the stream, check alignment, and
 713                  * increment a single u64 in the hope to catch on again 'soon'.
 714                  */
 715                 if (unlikely(head & 7))
 716                         head &= ~7ULL;
 717
 718                 size = 8;
 719         }
 720
 721         head += size;
 722
 723         dump_printf("\n%#Lx [%#x]: event: %d\n",
 724                     head, event.header.size, event.header.type);
 725
 726         if (skip > 0)
 727                 head += skip;
 728
 729         if (!session_done())
 730                 goto more;
 731 done:
 732         err = 0;
 733 out_err:
 734         return err;
 735 }
 736
 737 int __perf_session__process_events(struct perf_session *session,
 738                                    u64 data_offset, u64 data_size,
 739                                    u64 file_size, struct perf_event_ops *ops)
 740 {
 741         u64 head, page_offset, file_offset, file_pos;
 742         int err, mmap_prot, mmap_flags;
 743         struct ui_progress *progress;
 744         size_t  page_size;
 745         event_t *event;
 746         uint32_t size;
 747         char *buf;
 748
 749         progress = ui_progress__new("Processing events...", session->size);
 750         if (progress == NULL)
 751                 return -1;
 752
 753         perf_event_ops__fill_defaults(ops);
 754
 755         page_size = sysconf(_SC_PAGESIZE);
 756
 757         page_offset = page_size * (data_offset / page_size);
 758         file_offset = page_offset;
 759         head = data_offset - page_offset;
 760
 761         if (data_offset + data_size < file_size)
 762                 file_size = data_offset + data_size;
 763
 764         mmap_prot  = PROT_READ;
 765         mmap_flags = MAP_SHARED;
 766
 767         if (session->header.needs_swap) {
 768                 mmap_prot  |= PROT_WRITE;
 769                 mmap_flags = MAP_PRIVATE;
 770         }
 771 remap:
 772         buf = mmap(NULL, page_size * session->mmap_window, mmap_prot,
 773                    mmap_flags, session->fd, file_offset);
 774         if (buf == MAP_FAILED) {
 775                 pr_err("failed to mmap file\n");
 776                 err = -errno;
 777                 goto out_err;
 778         }
 779         file_pos = file_offset + head;
 780         ui_progress__update(progress, file_offset);
 781
 782 more:
 783         event = (event_t *)(buf + head);
 784
 785         if (session->header.needs_swap)
 786                 perf_event_header__bswap(&event->header);
 787         size = event->header.size;
 788         if (size == 0)
 789                 size = 8;
 790
 791         if (head + event->header.size >= page_size * session->mmap_window) {
 792                 int munmap_ret;
 793
 794                 munmap_ret = munmap(buf, page_size * session->mmap_window);
 795                 assert(munmap_ret == 0);
 796
 797                 page_offset = page_size * (head / page_size);
 798                 file_offset += page_offset;
 799                 head -= page_offset;
 800                 goto remap;
 801         }
 802
 803         size = event->header.size;
 804
 805         dump_printf("\n%#Lx [%#x]: event: %d\n",
 806                     file_pos, event->header.size, event->header.type);
 807
 808         if (size == 0 ||
 809             perf_session__process_event(session, event, ops, file_pos) < 0) {
 810                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 811                             file_offset + head, event->header.size,
 812                             event->header.type);
 813                 /*
 814                  * assume we lost track of the stream, check alignment, and
 815                  * increment a single u64 in the hope to catch on again 'soon'.
 816                  */
 817                 if (unlikely(head & 7))
 818                         head &= ~7ULL;
 819
 820                 size = 8;
 821         }
 822
 823         head += size;
 824         file_pos += size;
 825
 826         if (file_pos < file_size)
 827                 goto more;
 828
 829         err = 0;
 830         /* do the final flush for ordered samples */
 831         session->ordered_samples.next_flush = ULLONG_MAX;
 832         flush_sample_queue(session, ops);
 833 out_err:
 834         ui_progress__delete(progress);
 835
 836         if (ops->lost == event__process_lost &&
 837             session->hists.stats.total_lost != 0) {
 838                 ui__warning("Processed %Lu events and LOST %Lu!\n\n"
 839                             "Check IO/CPU overload!\n\n",
 840                             session->hists.stats.total_period,
 841                             session->hists.stats.total_lost);
 842         }
 843
 844         if (session->hists.stats.nr_unknown_events != 0) {
 845                 ui__warning("Found %u unknown events!\n\n"
 846                             "Is this an older tool processing a perf.data "
 847                             "file generated by a more recent tool?\n\n"
 848                             "If that is not the case, consider "
 849                             "reporting to linux-kernel@vger.kernel.org.\n\n",
 850                             session->hists.stats.nr_unknown_events);
 851         }
 852
 853         return err;
 854 }
 855
 856 int perf_session__process_events(struct perf_session *self,
 857                                  struct perf_event_ops *ops)
 858 {
 859         int err;
 860
 861         if (perf_session__register_idle_thread(self) == NULL)
 862                 return -ENOMEM;
 863
 864         if (!self->fd_pipe)
 865                 err = __perf_session__process_events(self,
 866                                                      self->header.data_offset,
 867                                                      self->header.data_size,
 868                                                      self->size, ops);
 869         else
 870                 err = __perf_session__process_pipe_events(self, ops);
 871
 872         return err;
 873 }
 874
 875 bool perf_session__has_traces(struct perf_session *self, const char *msg)
 876 {
 877         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
 878                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
 879                 return false;
 880         }
 881
 882         return true;
 883 }
 884
 885 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
 886                                              const char *symbol_name,
 887                                              u64 addr)
 888 {
 889         char *bracket;
 890         enum map_type i;
 891         struct ref_reloc_sym *ref;
 892
 893         ref = zalloc(sizeof(struct ref_reloc_sym));
 894         if (ref == NULL)
 895                 return -ENOMEM;
 896
 897         ref->name = strdup(symbol_name);
 898         if (ref->name == NULL) {
 899                 free(ref);
 900                 return -ENOMEM;
 901         }
 902
 903         bracket = strchr(ref->name, ']');
 904         if (bracket)
 905                 *bracket = '\0';
 906
 907         ref->addr = addr;
 908
 909         for (i = 0; i < MAP__NR_TYPES; ++i) {
 910                 struct kmap *kmap = map__kmap(maps[i]);
 911                 kmap->ref_reloc_sym = ref;
 912         }
 913
 914         return 0;
 915 }
 916
 917 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
 918 {
 919         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
 920                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
 921                machines__fprintf_dsos(&self->machines, fp);
 922 }
 923
 924 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
 925                                           bool with_hits)
 926 {
 927         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
 928         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
 929 }