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         /*
 105          * On 64bit we can mmap the data file in one go. No need for tiny mmap
 106          * slices. On 32bit we use 32MB.
 107          */
 108 #if BITS_PER_LONG == 64
 109         self->mmap_window = ULLONG_MAX;
 110 #else
 111         self->mmap_window = 32 * 1024 * 1024ULL;
 112 #endif
 113         self->machines = RB_ROOT;
 114         self->repipe = repipe;
 115         INIT_LIST_HEAD(&self->ordered_samples.samples);
 116         machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 117
 118         if (mode == O_RDONLY) {
 119                 if (perf_session__open(self, force) < 0)
 120                         goto out_delete;
 121         } else if (mode == O_WRONLY) {
 122                 /*
 123                  * In O_RDONLY mode this will be performed when reading the
 124                  * kernel MMAP event, in event__process_mmap().
 125                  */
 126                 if (perf_session__create_kernel_maps(self) < 0)
 127                         goto out_delete;
 128         }
 129
 130         perf_session__update_sample_type(self);
 131 out:
 132         return self;
 133 out_free:
 134         free(self);
 135         return NULL;
 136 out_delete:
 137         perf_session__delete(self);
 138         return NULL;
 139 }
 140
 141 static void perf_session__delete_dead_threads(struct perf_session *self)
 142 {
 143         struct thread *n, *t;
 144
 145         list_for_each_entry_safe(t, n, &self->dead_threads, node) {
 146                 list_del(&t->node);
 147                 thread__delete(t);
 148         }
 149 }
 150
 151 static void perf_session__delete_threads(struct perf_session *self)
 152 {
 153         struct rb_node *nd = rb_first(&self->threads);
 154
 155         while (nd) {
 156                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 157
 158                 rb_erase(&t->rb_node, &self->threads);
 159                 nd = rb_next(nd);
 160                 thread__delete(t);
 161         }
 162 }
 163
 164 void perf_session__delete(struct perf_session *self)
 165 {
 166         perf_header__exit(&self->header);
 167         perf_session__destroy_kernel_maps(self);
 168         perf_session__delete_dead_threads(self);
 169         perf_session__delete_threads(self);
 170         machine__exit(&self->host_machine);
 171         close(self->fd);
 172         free(self);
 173 }
 174
 175 void perf_session__remove_thread(struct perf_session *self, struct thread *th)
 176 {
 177         self->last_match = NULL;
 178         rb_erase(&th->rb_node, &self->threads);
 179         /*
 180          * We may have references to this thread, for instance in some hist_entry
 181          * instances, so just move them to a separate list.
 182          */
 183         list_add_tail(&th->node, &self->dead_threads);
 184 }
 185
 186 static bool symbol__match_parent_regex(struct symbol *sym)
 187 {
 188         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 189                 return 1;
 190
 191         return 0;
 192 }
 193
 194 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self,
 195                                                    struct thread *thread,
 196                                                    struct ip_callchain *chain,
 197                                                    struct symbol **parent)
 198 {
 199         u8 cpumode = PERF_RECORD_MISC_USER;
 200         unsigned int i;
 201         struct map_symbol *syms = calloc(chain->nr, sizeof(*syms));
 202
 203         if (!syms)
 204                 return NULL;
 205
 206         for (i = 0; i < chain->nr; i++) {
 207                 u64 ip = chain->ips[i];
 208                 struct addr_location al;
 209
 210                 if (ip >= PERF_CONTEXT_MAX) {
 211                         switch (ip) {
 212                         case PERF_CONTEXT_HV:
 213                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 214                         case PERF_CONTEXT_KERNEL:
 215                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 216                         case PERF_CONTEXT_USER:
 217                                 cpumode = PERF_RECORD_MISC_USER;        break;
 218                         default:
 219                                 break;
 220                         }
 221                         continue;
 222                 }
 223
 224                 al.filtered = false;
 225                 thread__find_addr_location(thread, self, cpumode,
 226                                 MAP__FUNCTION, thread->pid, ip, &al, NULL);
 227                 if (al.sym != NULL) {
 228                         if (sort__has_parent && !*parent &&
 229                             symbol__match_parent_regex(al.sym))
 230                                 *parent = al.sym;
 231                         if (!symbol_conf.use_callchain)
 232                                 break;
 233                         syms[i].map = al.map;
 234                         syms[i].sym = al.sym;
 235                 }
 236         }
 237
 238         return syms;
 239 }
 240
 241 static int process_event_stub(event_t *event __used,
 242                               struct perf_session *session __used)
 243 {
 244         dump_printf(": unhandled!\n");
 245         return 0;
 246 }
 247
 248 static int process_finished_round_stub(event_t *event __used,
 249                                        struct perf_session *session __used,
 250                                        struct perf_event_ops *ops __used)
 251 {
 252         dump_printf(": unhandled!\n");
 253         return 0;
 254 }
 255
 256 static int process_finished_round(event_t *event,
 257                                   struct perf_session *session,
 258                                   struct perf_event_ops *ops);
 259
 260 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
 261 {
 262         if (handler->sample == NULL)
 263                 handler->sample = process_event_stub;
 264         if (handler->mmap == NULL)
 265                 handler->mmap = process_event_stub;
 266         if (handler->comm == NULL)
 267                 handler->comm = process_event_stub;
 268         if (handler->fork == NULL)
 269                 handler->fork = process_event_stub;
 270         if (handler->exit == NULL)
 271                 handler->exit = process_event_stub;
 272         if (handler->lost == NULL)
 273                 handler->lost = event__process_lost;
 274         if (handler->read == NULL)
 275                 handler->read = process_event_stub;
 276         if (handler->throttle == NULL)
 277                 handler->throttle = process_event_stub;
 278         if (handler->unthrottle == NULL)
 279                 handler->unthrottle = process_event_stub;
 280         if (handler->attr == NULL)
 281                 handler->attr = process_event_stub;
 282         if (handler->event_type == NULL)
 283                 handler->event_type = process_event_stub;
 284         if (handler->tracing_data == NULL)
 285                 handler->tracing_data = process_event_stub;
 286         if (handler->build_id == NULL)
 287                 handler->build_id = process_event_stub;
 288         if (handler->finished_round == NULL) {
 289                 if (handler->ordered_samples)
 290                         handler->finished_round = process_finished_round;
 291                 else
 292                         handler->finished_round = process_finished_round_stub;
 293         }
 294 }
 295
 296 void mem_bswap_64(void *src, int byte_size)
 297 {
 298         u64 *m = src;
 299
 300         while (byte_size > 0) {
 301                 *m = bswap_64(*m);
 302                 byte_size -= sizeof(u64);
 303                 ++m;
 304         }
 305 }
 306
 307 static void event__all64_swap(event_t *self)
 308 {
 309         struct perf_event_header *hdr = &self->header;
 310         mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
 311 }
 312
 313 static void event__comm_swap(event_t *self)
 314 {
 315         self->comm.pid = bswap_32(self->comm.pid);
 316         self->comm.tid = bswap_32(self->comm.tid);
 317 }
 318
 319 static void event__mmap_swap(event_t *self)
 320 {
 321         self->mmap.pid   = bswap_32(self->mmap.pid);
 322         self->mmap.tid   = bswap_32(self->mmap.tid);
 323         self->mmap.start = bswap_64(self->mmap.start);
 324         self->mmap.len   = bswap_64(self->mmap.len);
 325         self->mmap.pgoff = bswap_64(self->mmap.pgoff);
 326 }
 327
 328 static void event__task_swap(event_t *self)
 329 {
 330         self->fork.pid  = bswap_32(self->fork.pid);
 331         self->fork.tid  = bswap_32(self->fork.tid);
 332         self->fork.ppid = bswap_32(self->fork.ppid);
 333         self->fork.ptid = bswap_32(self->fork.ptid);
 334         self->fork.time = bswap_64(self->fork.time);
 335 }
 336
 337 static void event__read_swap(event_t *self)
 338 {
 339         self->read.pid          = bswap_32(self->read.pid);
 340         self->read.tid          = bswap_32(self->read.tid);
 341         self->read.value        = bswap_64(self->read.value);
 342         self->read.time_enabled = bswap_64(self->read.time_enabled);
 343         self->read.time_running = bswap_64(self->read.time_running);
 344         self->read.id           = bswap_64(self->read.id);
 345 }
 346
 347 static void event__attr_swap(event_t *self)
 348 {
 349         size_t size;
 350
 351         self->attr.attr.type            = bswap_32(self->attr.attr.type);
 352         self->attr.attr.size            = bswap_32(self->attr.attr.size);
 353         self->attr.attr.config          = bswap_64(self->attr.attr.config);
 354         self->attr.attr.sample_period   = bswap_64(self->attr.attr.sample_period);
 355         self->attr.attr.sample_type     = bswap_64(self->attr.attr.sample_type);
 356         self->attr.attr.read_format     = bswap_64(self->attr.attr.read_format);
 357         self->attr.attr.wakeup_events   = bswap_32(self->attr.attr.wakeup_events);
 358         self->attr.attr.bp_type         = bswap_32(self->attr.attr.bp_type);
 359         self->attr.attr.bp_addr         = bswap_64(self->attr.attr.bp_addr);
 360         self->attr.attr.bp_len          = bswap_64(self->attr.attr.bp_len);
 361
 362         size = self->header.size;
 363         size -= (void *)&self->attr.id - (void *)self;
 364         mem_bswap_64(self->attr.id, size);
 365 }
 366
 367 static void event__event_type_swap(event_t *self)
 368 {
 369         self->event_type.event_type.event_id =
 370                 bswap_64(self->event_type.event_type.event_id);
 371 }
 372
 373 static void event__tracing_data_swap(event_t *self)
 374 {
 375         self->tracing_data.size = bswap_32(self->tracing_data.size);
 376 }
 377
 378 typedef void (*event__swap_op)(event_t *self);
 379
 380 static event__swap_op event__swap_ops[] = {
 381         [PERF_RECORD_MMAP]   = event__mmap_swap,
 382         [PERF_RECORD_COMM]   = event__comm_swap,
 383         [PERF_RECORD_FORK]   = event__task_swap,
 384         [PERF_RECORD_EXIT]   = event__task_swap,
 385         [PERF_RECORD_LOST]   = event__all64_swap,
 386         [PERF_RECORD_READ]   = event__read_swap,
 387         [PERF_RECORD_SAMPLE] = event__all64_swap,
 388         [PERF_RECORD_HEADER_ATTR]   = event__attr_swap,
 389         [PERF_RECORD_HEADER_EVENT_TYPE]   = event__event_type_swap,
 390         [PERF_RECORD_HEADER_TRACING_DATA]   = event__tracing_data_swap,
 391         [PERF_RECORD_HEADER_BUILD_ID]   = NULL,
 392         [PERF_RECORD_HEADER_MAX]    = NULL,
 393 };
 394
 395 struct sample_queue {
 396         u64                     timestamp;
 397         event_t                 *event;
 398         struct list_head        list;
 399 };
 400
 401 static void flush_sample_queue(struct perf_session *s,
 402                                struct perf_event_ops *ops)
 403 {
 404         struct ordered_samples *os = &s->ordered_samples;
 405         struct list_head *head = &os->samples;
 406         struct sample_queue *tmp, *iter;
 407         u64 limit = os->next_flush;
 408         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 409
 410         if (!ops->ordered_samples || !limit)
 411                 return;
 412
 413         list_for_each_entry_safe(iter, tmp, head, list) {
 414                 if (iter->timestamp > limit)
 415                         break;
 416
 417                 ops->sample(iter->event, s);
 418
 419                 os->last_flush = iter->timestamp;
 420                 list_del(&iter->list);
 421                 free(iter);
 422         }
 423
 424         if (list_empty(head)) {
 425                 os->last_sample = NULL;
 426         } else if (last_ts <= limit) {
 427                 os->last_sample =
 428                         list_entry(head->prev, struct sample_queue, list);
 429         }
 430 }
 431
 432 /*
 433  * When perf record finishes a pass on every buffers, it records this pseudo
 434  * event.
 435  * We record the max timestamp t found in the pass n.
 436  * Assuming these timestamps are monotonic across cpus, we know that if
 437  * a buffer still has events with timestamps below t, they will be all
 438  * available and then read in the pass n + 1.
 439  * Hence when we start to read the pass n + 2, we can safely flush every
 440  * events with timestamps below t.
 441  *
 442  *    ============ PASS n =================
 443  *       CPU 0         |   CPU 1
 444  *                     |
 445  *    cnt1 timestamps  |   cnt2 timestamps
 446  *          1          |         2
 447  *          2          |         3
 448  *          -          |         4  <--- max recorded
 449  *
 450  *    ============ PASS n + 1 ==============
 451  *       CPU 0         |   CPU 1
 452  *                     |
 453  *    cnt1 timestamps  |   cnt2 timestamps
 454  *          3          |         5
 455  *          4          |         6
 456  *          5          |         7 <---- max recorded
 457  *
 458  *      Flush every events below timestamp 4
 459  *
 460  *    ============ PASS n + 2 ==============
 461  *       CPU 0         |   CPU 1
 462  *                     |
 463  *    cnt1 timestamps  |   cnt2 timestamps
 464  *          6          |         8
 465  *          7          |         9
 466  *          -          |         10
 467  *
 468  *      Flush every events below timestamp 7
 469  *      etc...
 470  */
 471 static int process_finished_round(event_t *event __used,
 472                                   struct perf_session *session,
 473                                   struct perf_event_ops *ops)
 474 {
 475         flush_sample_queue(session, ops);
 476         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 477
 478         return 0;
 479 }
 480
 481 /* The queue is ordered by time */
 482 static void __queue_sample_event(struct sample_queue *new,
 483                                  struct perf_session *s)
 484 {
 485         struct ordered_samples *os = &s->ordered_samples;
 486         struct sample_queue *sample = os->last_sample;
 487         u64 timestamp = new->timestamp;
 488         struct list_head *p;
 489
 490         os->last_sample = new;
 491
 492         if (!sample) {
 493                 list_add(&new->list, &os->samples);
 494                 os->max_timestamp = timestamp;
 495                 return;
 496         }
 497
 498         /*
 499          * last_sample might point to some random place in the list as it's
 500          * the last queued event. We expect that the new event is close to
 501          * this.
 502          */
 503         if (sample->timestamp <= timestamp) {
 504                 while (sample->timestamp <= timestamp) {
 505                         p = sample->list.next;
 506                         if (p == &os->samples) {
 507                                 list_add_tail(&new->list, &os->samples);
 508                                 os->max_timestamp = timestamp;
 509                                 return;
 510                         }
 511                         sample = list_entry(p, struct sample_queue, list);
 512                 }
 513                 list_add_tail(&new->list, &sample->list);
 514         } else {
 515                 while (sample->timestamp > timestamp) {
 516                         p = sample->list.prev;
 517                         if (p == &os->samples) {
 518                                 list_add(&new->list, &os->samples);
 519                                 return;
 520                         }
 521                         sample = list_entry(p, struct sample_queue, list);
 522                 }
 523                 list_add(&new->list, &sample->list);
 524         }
 525 }
 526
 527 static int queue_sample_event(event_t *event, struct sample_data *data,
 528                               struct perf_session *s)
 529 {
 530         u64 timestamp = data->time;
 531         struct sample_queue *new;
 532
 533         if (timestamp < s->ordered_samples.last_flush) {
 534                 printf("Warning: Timestamp below last timeslice flush\n");
 535                 return -EINVAL;
 536         }
 537
 538         new = malloc(sizeof(*new));
 539         if (!new)
 540                 return -ENOMEM;
 541
 542         new->timestamp = timestamp;
 543         new->event = event;
 544
 545         __queue_sample_event(new, s);
 546
 547         return 0;
 548 }
 549
 550 static int perf_session__process_sample(event_t *event, struct perf_session *s,
 551                                         struct perf_event_ops *ops)
 552 {
 553         struct sample_data data;
 554
 555         if (!ops->ordered_samples)
 556                 return ops->sample(event, s);
 557
 558         bzero(&data, sizeof(struct sample_data));
 559         event__parse_sample(event, s->sample_type, &data);
 560
 561         queue_sample_event(event, &data, s);
 562
 563         return 0;
 564 }
 565
 566 static int perf_session__process_event(struct perf_session *self,
 567                                        event_t *event,
 568                                        struct perf_event_ops *ops,
 569                                        u64 file_offset)
 570 {
 571         trace_event(event);
 572
 573         if (event->header.type < PERF_RECORD_HEADER_MAX) {
 574                 dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
 575                             file_offset, event->header.size,
 576                             event__name[event->header.type]);
 577                 hists__inc_nr_events(&self->hists, event->header.type);
 578         }
 579
 580         if (self->header.needs_swap && event__swap_ops[event->header.type])
 581                 event__swap_ops[event->header.type](event);
 582
 583         switch (event->header.type) {
 584         case PERF_RECORD_SAMPLE:
 585                 return perf_session__process_sample(event, self, ops);
 586         case PERF_RECORD_MMAP:
 587                 return ops->mmap(event, self);
 588         case PERF_RECORD_COMM:
 589                 return ops->comm(event, self);
 590         case PERF_RECORD_FORK:
 591                 return ops->fork(event, self);
 592         case PERF_RECORD_EXIT:
 593                 return ops->exit(event, self);
 594         case PERF_RECORD_LOST:
 595                 return ops->lost(event, self);
 596         case PERF_RECORD_READ:
 597                 return ops->read(event, self);
 598         case PERF_RECORD_THROTTLE:
 599                 return ops->throttle(event, self);
 600         case PERF_RECORD_UNTHROTTLE:
 601                 return ops->unthrottle(event, self);
 602         case PERF_RECORD_HEADER_ATTR:
 603                 return ops->attr(event, self);
 604         case PERF_RECORD_HEADER_EVENT_TYPE:
 605                 return ops->event_type(event, self);
 606         case PERF_RECORD_HEADER_TRACING_DATA:
 607                 /* setup for reading amidst mmap */
 608                 lseek(self->fd, file_offset, SEEK_SET);
 609                 return ops->tracing_data(event, self);
 610         case PERF_RECORD_HEADER_BUILD_ID:
 611                 return ops->build_id(event, self);
 612         case PERF_RECORD_FINISHED_ROUND:
 613                 return ops->finished_round(event, self, ops);
 614         default:
 615                 ++self->hists.stats.nr_unknown_events;
 616                 return -1;
 617         }
 618 }
 619
 620 void perf_event_header__bswap(struct perf_event_header *self)
 621 {
 622         self->type = bswap_32(self->type);
 623         self->misc = bswap_16(self->misc);
 624         self->size = bswap_16(self->size);
 625 }
 626
 627 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
 628 {
 629         struct thread *thread = perf_session__findnew(self, 0);
 630
 631         if (thread == NULL || thread__set_comm(thread, "swapper")) {
 632                 pr_err("problem inserting idle task.\n");
 633                 thread = NULL;
 634         }
 635
 636         return thread;
 637 }
 638
 639 int do_read(int fd, void *buf, size_t size)
 640 {
 641         void *buf_start = buf;
 642
 643         while (size) {
 644                 int ret = read(fd, buf, size);
 645
 646                 if (ret <= 0)
 647                         return ret;
 648
 649                 size -= ret;
 650                 buf += ret;
 651         }
 652
 653         return buf - buf_start;
 654 }
 655
 656 #define session_done()  (*(volatile int *)(&session_done))
 657 volatile int session_done;
 658
 659 static int __perf_session__process_pipe_events(struct perf_session *self,
 660                                                struct perf_event_ops *ops)
 661 {
 662         event_t event;
 663         uint32_t size;
 664         int skip = 0;
 665         u64 head;
 666         int err;
 667         void *p;
 668
 669         perf_event_ops__fill_defaults(ops);
 670
 671         head = 0;
 672 more:
 673         err = do_read(self->fd, &event, sizeof(struct perf_event_header));
 674         if (err <= 0) {
 675                 if (err == 0)
 676                         goto done;
 677
 678                 pr_err("failed to read event header\n");
 679                 goto out_err;
 680         }
 681
 682         if (self->header.needs_swap)
 683                 perf_event_header__bswap(&event.header);
 684
 685         size = event.header.size;
 686         if (size == 0)
 687                 size = 8;
 688
 689         p = &event;
 690         p += sizeof(struct perf_event_header);
 691
 692         if (size - sizeof(struct perf_event_header)) {
 693                 err = do_read(self->fd, p,
 694                               size - sizeof(struct perf_event_header));
 695                 if (err <= 0) {
 696                         if (err == 0) {
 697                                 pr_err("unexpected end of event stream\n");
 698                                 goto done;
 699                         }
 700
 701                         pr_err("failed to read event data\n");
 702                         goto out_err;
 703                 }
 704         }
 705
 706         if (size == 0 ||
 707             (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
 708                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 709                             head, event.header.size, event.header.type);
 710                 /*
 711                  * assume we lost track of the stream, check alignment, and
 712                  * increment a single u64 in the hope to catch on again 'soon'.
 713                  */
 714                 if (unlikely(head & 7))
 715                         head &= ~7ULL;
 716
 717                 size = 8;
 718         }
 719
 720         head += size;
 721
 722         dump_printf("\n%#Lx [%#x]: event: %d\n",
 723                     head, event.header.size, event.header.type);
 724
 725         if (skip > 0)
 726                 head += skip;
 727
 728         if (!session_done())
 729                 goto more;
 730 done:
 731         err = 0;
 732 out_err:
 733         return err;
 734 }
 735
 736 int __perf_session__process_events(struct perf_session *session,
 737                                    u64 data_offset, u64 data_size,
 738                                    u64 file_size, struct perf_event_ops *ops)
 739 {
 740         u64 head, page_offset, file_offset, file_pos, progress_next;
 741         int err, mmap_prot, mmap_flags, map_idx = 0;
 742         struct ui_progress *progress;
 743         size_t  page_size, mmap_size;
 744         char *buf, *mmaps[8];
 745         event_t *event;
 746         uint32_t size;
 747
 748         perf_event_ops__fill_defaults(ops);
 749
 750         page_size = sysconf(_SC_PAGESIZE);
 751
 752         page_offset = page_size * (data_offset / page_size);
 753         file_offset = page_offset;
 754         head = data_offset - page_offset;
 755
 756         if (data_offset + data_size < file_size)
 757                 file_size = data_offset + data_size;
 758
 759         progress_next = file_size / 16;
 760         progress = ui_progress__new("Processing events...", file_size);
 761         if (progress == NULL)
 762                 return -1;
 763
 764         mmap_size = session->mmap_window;
 765         if (mmap_size > file_size)
 766                 mmap_size = file_size;
 767
 768         memset(mmaps, 0, sizeof(mmaps));
 769
 770         mmap_prot  = PROT_READ;
 771         mmap_flags = MAP_SHARED;
 772
 773         if (session->header.needs_swap) {
 774                 mmap_prot  |= PROT_WRITE;
 775                 mmap_flags = MAP_PRIVATE;
 776         }
 777 remap:
 778         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
 779                    file_offset);
 780         if (buf == MAP_FAILED) {
 781                 pr_err("failed to mmap file\n");
 782                 err = -errno;
 783                 goto out_err;
 784         }
 785         mmaps[map_idx] = buf;
 786         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
 787         file_pos = file_offset + head;
 788
 789 more:
 790         event = (event_t *)(buf + head);
 791
 792         if (session->header.needs_swap)
 793                 perf_event_header__bswap(&event->header);
 794         size = event->header.size;
 795         if (size == 0)
 796                 size = 8;
 797
 798         if (head + event->header.size >= mmap_size) {
 799                 if (mmaps[map_idx]) {
 800                         munmap(mmaps[map_idx], mmap_size);
 801                         mmaps[map_idx] = NULL;
 802                 }
 803
 804                 page_offset = page_size * (head / page_size);
 805                 file_offset += page_offset;
 806                 head -= page_offset;
 807                 goto remap;
 808         }
 809
 810         size = event->header.size;
 811
 812         dump_printf("\n%#Lx [%#x]: event: %d\n",
 813                     file_pos, event->header.size, event->header.type);
 814
 815         if (size == 0 ||
 816             perf_session__process_event(session, event, ops, file_pos) < 0) {
 817                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 818                             file_offset + head, event->header.size,
 819                             event->header.type);
 820                 /*
 821                  * assume we lost track of the stream, check alignment, and
 822                  * increment a single u64 in the hope to catch on again 'soon'.
 823                  */
 824                 if (unlikely(head & 7))
 825                         head &= ~7ULL;
 826
 827                 size = 8;
 828         }
 829
 830         head += size;
 831         file_pos += size;
 832
 833         if (file_pos >= progress_next) {
 834                 progress_next += file_size / 16;
 835                 ui_progress__update(progress, file_pos);
 836         }
 837
 838         if (file_pos < file_size)
 839                 goto more;
 840
 841         err = 0;
 842         /* do the final flush for ordered samples */
 843         session->ordered_samples.next_flush = ULLONG_MAX;
 844         flush_sample_queue(session, ops);
 845 out_err:
 846         ui_progress__delete(progress);
 847
 848         if (ops->lost == event__process_lost &&
 849             session->hists.stats.total_lost != 0) {
 850                 ui__warning("Processed %Lu events and LOST %Lu!\n\n"
 851                             "Check IO/CPU overload!\n\n",
 852                             session->hists.stats.total_period,
 853                             session->hists.stats.total_lost);
 854         }
 855
 856         if (session->hists.stats.nr_unknown_events != 0) {
 857                 ui__warning("Found %u unknown events!\n\n"
 858                             "Is this an older tool processing a perf.data "
 859                             "file generated by a more recent tool?\n\n"
 860                             "If that is not the case, consider "
 861                             "reporting to linux-kernel@vger.kernel.org.\n\n",
 862                             session->hists.stats.nr_unknown_events);
 863         }
 864
 865         return err;
 866 }
 867
 868 int perf_session__process_events(struct perf_session *self,
 869                                  struct perf_event_ops *ops)
 870 {
 871         int err;
 872
 873         if (perf_session__register_idle_thread(self) == NULL)
 874                 return -ENOMEM;
 875
 876         if (!self->fd_pipe)
 877                 err = __perf_session__process_events(self,
 878                                                      self->header.data_offset,
 879                                                      self->header.data_size,
 880                                                      self->size, ops);
 881         else
 882                 err = __perf_session__process_pipe_events(self, ops);
 883
 884         return err;
 885 }
 886
 887 bool perf_session__has_traces(struct perf_session *self, const char *msg)
 888 {
 889         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
 890                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
 891                 return false;
 892         }
 893
 894         return true;
 895 }
 896
 897 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
 898                                              const char *symbol_name,
 899                                              u64 addr)
 900 {
 901         char *bracket;
 902         enum map_type i;
 903         struct ref_reloc_sym *ref;
 904
 905         ref = zalloc(sizeof(struct ref_reloc_sym));
 906         if (ref == NULL)
 907                 return -ENOMEM;
 908
 909         ref->name = strdup(symbol_name);
 910         if (ref->name == NULL) {
 911                 free(ref);
 912                 return -ENOMEM;
 913         }
 914
 915         bracket = strchr(ref->name, ']');
 916         if (bracket)
 917                 *bracket = '\0';
 918
 919         ref->addr = addr;
 920
 921         for (i = 0; i < MAP__NR_TYPES; ++i) {
 922                 struct kmap *kmap = map__kmap(maps[i]);
 923                 kmap->ref_reloc_sym = ref;
 924         }
 925
 926         return 0;
 927 }
 928
 929 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
 930 {
 931         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
 932                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
 933                machines__fprintf_dsos(&self->machines, fp);
 934 }
 935
 936 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
 937                                           bool with_hits)
 938 {
 939         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
 940         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
 941 }