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