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