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 "evlist.h"
  11 #include "evsel.h"
  12 #include "session.h"
  13 #include "tool.h"
  14 #include "sort.h"
  15 #include "util.h"
  16 #include "cpumap.h"
  17
  18 static int perf_session__open(struct perf_session *self, bool force)
  19 {
  20         struct stat input_stat;
  21
  22         if (!strcmp(self->filename, "-")) {
  23                 self->fd_pipe = true;
  24                 self->fd = STDIN_FILENO;
  25
  26                 if (perf_session__read_header(self, self->fd) < 0)
  27                         pr_err("incompatible file format (rerun with -v to learn more)");
  28
  29                 return 0;
  30         }
  31
  32         self->fd = open(self->filename, O_RDONLY);
  33         if (self->fd < 0) {
  34                 int err = errno;
  35
  36                 pr_err("failed to open %s: %s", self->filename, strerror(err));
  37                 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
  38                         pr_err("  (try 'perf record' first)");
  39                 pr_err("\n");
  40                 return -errno;
  41         }
  42
  43         if (fstat(self->fd, &input_stat) < 0)
  44                 goto out_close;
  45
  46         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
  47                 pr_err("file %s not owned by current user or root\n",
  48                        self->filename);
  49                 goto out_close;
  50         }
  51
  52         if (!input_stat.st_size) {
  53                 pr_info("zero-sized file (%s), nothing to do!\n",
  54                         self->filename);
  55                 goto out_close;
  56         }
  57
  58         if (perf_session__read_header(self, self->fd) < 0) {
  59                 pr_err("incompatible file format (rerun with -v to learn more)");
  60                 goto out_close;
  61         }
  62
  63         if (!perf_evlist__valid_sample_type(self->evlist)) {
  64                 pr_err("non matching sample_type");
  65                 goto out_close;
  66         }
  67
  68         if (!perf_evlist__valid_sample_id_all(self->evlist)) {
  69                 pr_err("non matching sample_id_all");
  70                 goto out_close;
  71         }
  72
  73         self->size = input_stat.st_size;
  74         return 0;
  75
  76 out_close:
  77         close(self->fd);
  78         self->fd = -1;
  79         return -1;
  80 }
  81
  82 void perf_session__update_sample_type(struct perf_session *self)
  83 {
  84         self->sample_type = perf_evlist__sample_type(self->evlist);
  85         self->sample_size = __perf_evsel__sample_size(self->sample_type);
  86         self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
  87         self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist);
  88         self->host_machine.id_hdr_size = self->id_hdr_size;
  89 }
  90
  91 int perf_session__create_kernel_maps(struct perf_session *self)
  92 {
  93         int ret = machine__create_kernel_maps(&self->host_machine);
  94
  95         if (ret >= 0)
  96                 ret = machines__create_guest_kernel_maps(&self->machines);
  97         return ret;
  98 }
  99
 100 static void perf_session__destroy_kernel_maps(struct perf_session *self)
 101 {
 102         machine__destroy_kernel_maps(&self->host_machine);
 103         machines__destroy_guest_kernel_maps(&self->machines);
 104 }
 105
 106 struct perf_session *perf_session__new(const char *filename, int mode,
 107                                        bool force, bool repipe,
 108                                        struct perf_tool *tool)
 109 {
 110         struct perf_session *self;
 111         struct stat st;
 112         size_t len;
 113
 114         if (!filename || !strlen(filename)) {
 115                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
 116                         filename = "-";
 117                 else
 118                         filename = "perf.data";
 119         }
 120
 121         len = strlen(filename);
 122         self = zalloc(sizeof(*self) + len);
 123
 124         if (self == NULL)
 125                 goto out;
 126
 127         memcpy(self->filename, filename, len);
 128         /*
 129          * On 64bit we can mmap the data file in one go. No need for tiny mmap
 130          * slices. On 32bit we use 32MB.
 131          */
 132 #if BITS_PER_LONG == 64
 133         self->mmap_window = ULLONG_MAX;
 134 #else
 135         self->mmap_window = 32 * 1024 * 1024ULL;
 136 #endif
 137         self->machines = RB_ROOT;
 138         self->repipe = repipe;
 139         INIT_LIST_HEAD(&self->ordered_samples.samples);
 140         INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
 141         INIT_LIST_HEAD(&self->ordered_samples.to_free);
 142         machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 143
 144         if (mode == O_RDONLY) {
 145                 if (perf_session__open(self, force) < 0)
 146                         goto out_delete;
 147                 perf_session__update_sample_type(self);
 148         } else if (mode == O_WRONLY) {
 149                 /*
 150                  * In O_RDONLY mode this will be performed when reading the
 151                  * kernel MMAP event, in perf_event__process_mmap().
 152                  */
 153                 if (perf_session__create_kernel_maps(self) < 0)
 154                         goto out_delete;
 155         }
 156
 157         if (tool && tool->ordering_requires_timestamps &&
 158             tool->ordered_samples && !self->sample_id_all) {
 159                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 160                 tool->ordered_samples = false;
 161         }
 162
 163 out:
 164         return self;
 165 out_delete:
 166         perf_session__delete(self);
 167         return NULL;
 168 }
 169
 170 static void machine__delete_dead_threads(struct machine *machine)
 171 {
 172         struct thread *n, *t;
 173
 174         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
 175                 list_del(&t->node);
 176                 thread__delete(t);
 177         }
 178 }
 179
 180 static void perf_session__delete_dead_threads(struct perf_session *session)
 181 {
 182         machine__delete_dead_threads(&session->host_machine);
 183 }
 184
 185 static void machine__delete_threads(struct machine *self)
 186 {
 187         struct rb_node *nd = rb_first(&self->threads);
 188
 189         while (nd) {
 190                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 191
 192                 rb_erase(&t->rb_node, &self->threads);
 193                 nd = rb_next(nd);
 194                 thread__delete(t);
 195         }
 196 }
 197
 198 static void perf_session__delete_threads(struct perf_session *session)
 199 {
 200         machine__delete_threads(&session->host_machine);
 201 }
 202
 203 void perf_session__delete(struct perf_session *self)
 204 {
 205         perf_session__destroy_kernel_maps(self);
 206         perf_session__delete_dead_threads(self);
 207         perf_session__delete_threads(self);
 208         machine__exit(&self->host_machine);
 209         close(self->fd);
 210         free(self);
 211 }
 212
 213 void machine__remove_thread(struct machine *self, struct thread *th)
 214 {
 215         self->last_match = NULL;
 216         rb_erase(&th->rb_node, &self->threads);
 217         /*
 218          * We may have references to this thread, for instance in some hist_entry
 219          * instances, so just move them to a separate list.
 220          */
 221         list_add_tail(&th->node, &self->dead_threads);
 222 }
 223
 224 static bool symbol__match_parent_regex(struct symbol *sym)
 225 {
 226         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 227                 return 1;
 228
 229         return 0;
 230 }
 231
 232 static const u8 cpumodes[] = {
 233         PERF_RECORD_MISC_USER,
 234         PERF_RECORD_MISC_KERNEL,
 235         PERF_RECORD_MISC_GUEST_USER,
 236         PERF_RECORD_MISC_GUEST_KERNEL
 237 };
 238 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8))
 239
 240 static void ip__resolve_ams(struct machine *self, struct thread *thread,
 241                             struct addr_map_symbol *ams,
 242                             u64 ip)
 243 {
 244         struct addr_location al;
 245         size_t i;
 246         u8 m;
 247
 248         memset(&al, 0, sizeof(al));
 249
 250         for (i = 0; i < NCPUMODES; i++) {
 251                 m = cpumodes[i];
 252                 /*
 253                  * We cannot use the header.misc hint to determine whether a
 254                  * branch stack address is user, kernel, guest, hypervisor.
 255                  * Branches may straddle the kernel/user/hypervisor boundaries.
 256                  * Thus, we have to try consecutively until we find a match
 257                  * or else, the symbol is unknown
 258                  */
 259                 thread__find_addr_location(thread, self, m, MAP__FUNCTION,
 260                                 ip, &al, NULL);
 261                 if (al.sym)
 262                         goto found;
 263         }
 264 found:
 265         ams->addr = ip;
 266         ams->al_addr = al.addr;
 267         ams->sym = al.sym;
 268         ams->map = al.map;
 269 }
 270
 271 struct branch_info *machine__resolve_bstack(struct machine *self,
 272                                             struct thread *thr,
 273                                             struct branch_stack *bs)
 274 {
 275         struct branch_info *bi;
 276         unsigned int i;
 277
 278         bi = calloc(bs->nr, sizeof(struct branch_info));
 279         if (!bi)
 280                 return NULL;
 281
 282         for (i = 0; i < bs->nr; i++) {
 283                 ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to);
 284                 ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from);
 285                 bi[i].flags = bs->entries[i].flags;
 286         }
 287         return bi;
 288 }
 289
 290 int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
 291                                struct thread *thread,
 292                                struct ip_callchain *chain,
 293                                struct symbol **parent)
 294 {
 295         u8 cpumode = PERF_RECORD_MISC_USER;
 296         unsigned int i;
 297         int err;
 298
 299         callchain_cursor_reset(&evsel->hists.callchain_cursor);
 300
 301         for (i = 0; i < chain->nr; i++) {
 302                 u64 ip;
 303                 struct addr_location al;
 304
 305                 if (callchain_param.order == ORDER_CALLEE)
 306                         ip = chain->ips[i];
 307                 else
 308                         ip = chain->ips[chain->nr - i - 1];
 309
 310                 if (ip >= PERF_CONTEXT_MAX) {
 311                         switch (ip) {
 312                         case PERF_CONTEXT_HV:
 313                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 314                         case PERF_CONTEXT_KERNEL:
 315                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 316                         case PERF_CONTEXT_USER:
 317                                 cpumode = PERF_RECORD_MISC_USER;        break;
 318                         default:
 319                                 break;
 320                         }
 321                         continue;
 322                 }
 323
 324                 al.filtered = false;
 325                 thread__find_addr_location(thread, self, cpumode,
 326                                            MAP__FUNCTION, ip, &al, NULL);
 327                 if (al.sym != NULL) {
 328                         if (sort__has_parent && !*parent &&
 329                             symbol__match_parent_regex(al.sym))
 330                                 *parent = al.sym;
 331                         if (!symbol_conf.use_callchain)
 332                                 break;
 333                 }
 334
 335                 err = callchain_cursor_append(&evsel->hists.callchain_cursor,
 336                                               ip, al.map, al.sym);
 337                 if (err)
 338                         return err;
 339         }
 340
 341         return 0;
 342 }
 343
 344 static int process_event_synth_tracing_data_stub(union perf_event *event __used,
 345                                                  struct perf_session *session __used)
 346 {
 347         dump_printf(": unhandled!\n");
 348         return 0;
 349 }
 350
 351 static int process_event_synth_attr_stub(union perf_event *event __used,
 352                                          struct perf_evlist **pevlist __used)
 353 {
 354         dump_printf(": unhandled!\n");
 355         return 0;
 356 }
 357
 358 static int process_event_sample_stub(struct perf_tool *tool __used,
 359                                      union perf_event *event __used,
 360                                      struct perf_sample *sample __used,
 361                                      struct perf_evsel *evsel __used,
 362                                      struct machine *machine __used)
 363 {
 364         dump_printf(": unhandled!\n");
 365         return 0;
 366 }
 367
 368 static int process_event_stub(struct perf_tool *tool __used,
 369                               union perf_event *event __used,
 370                               struct perf_sample *sample __used,
 371                               struct machine *machine __used)
 372 {
 373         dump_printf(": unhandled!\n");
 374         return 0;
 375 }
 376
 377 static int process_finished_round_stub(struct perf_tool *tool __used,
 378                                        union perf_event *event __used,
 379                                        struct perf_session *perf_session __used)
 380 {
 381         dump_printf(": unhandled!\n");
 382         return 0;
 383 }
 384
 385 static int process_event_type_stub(struct perf_tool *tool __used,
 386                                    union perf_event *event __used)
 387 {
 388         dump_printf(": unhandled!\n");
 389         return 0;
 390 }
 391
 392 static int process_finished_round(struct perf_tool *tool,
 393                                   union perf_event *event,
 394                                   struct perf_session *session);
 395
 396 static void perf_tool__fill_defaults(struct perf_tool *tool)
 397 {
 398         if (tool->sample == NULL)
 399                 tool->sample = process_event_sample_stub;
 400         if (tool->mmap == NULL)
 401                 tool->mmap = process_event_stub;
 402         if (tool->comm == NULL)
 403                 tool->comm = process_event_stub;
 404         if (tool->fork == NULL)
 405                 tool->fork = process_event_stub;
 406         if (tool->exit == NULL)
 407                 tool->exit = process_event_stub;
 408         if (tool->lost == NULL)
 409                 tool->lost = perf_event__process_lost;
 410         if (tool->read == NULL)
 411                 tool->read = process_event_sample_stub;
 412         if (tool->throttle == NULL)
 413                 tool->throttle = process_event_stub;
 414         if (tool->unthrottle == NULL)
 415                 tool->unthrottle = process_event_stub;
 416         if (tool->attr == NULL)
 417                 tool->attr = process_event_synth_attr_stub;
 418         if (tool->event_type == NULL)
 419                 tool->event_type = process_event_type_stub;
 420         if (tool->tracing_data == NULL)
 421                 tool->tracing_data = process_event_synth_tracing_data_stub;
 422         if (tool->build_id == NULL)
 423                 tool->build_id = process_finished_round_stub;
 424         if (tool->finished_round == NULL) {
 425                 if (tool->ordered_samples)
 426                         tool->finished_round = process_finished_round;
 427                 else
 428                         tool->finished_round = process_finished_round_stub;
 429         }
 430 }
 431
 432 void mem_bswap_64(void *src, int byte_size)
 433 {
 434         u64 *m = src;
 435
 436         while (byte_size > 0) {
 437                 *m = bswap_64(*m);
 438                 byte_size -= sizeof(u64);
 439                 ++m;
 440         }
 441 }
 442
 443 static void perf_event__all64_swap(union perf_event *event)
 444 {
 445         struct perf_event_header *hdr = &event->header;
 446         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 447 }
 448
 449 static void perf_event__comm_swap(union perf_event *event)
 450 {
 451         event->comm.pid = bswap_32(event->comm.pid);
 452         event->comm.tid = bswap_32(event->comm.tid);
 453 }
 454
 455 static void perf_event__mmap_swap(union perf_event *event)
 456 {
 457         event->mmap.pid   = bswap_32(event->mmap.pid);
 458         event->mmap.tid   = bswap_32(event->mmap.tid);
 459         event->mmap.start = bswap_64(event->mmap.start);
 460         event->mmap.len   = bswap_64(event->mmap.len);
 461         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 462 }
 463
 464 static void perf_event__task_swap(union perf_event *event)
 465 {
 466         event->fork.pid  = bswap_32(event->fork.pid);
 467         event->fork.tid  = bswap_32(event->fork.tid);
 468         event->fork.ppid = bswap_32(event->fork.ppid);
 469         event->fork.ptid = bswap_32(event->fork.ptid);
 470         event->fork.time = bswap_64(event->fork.time);
 471 }
 472
 473 static void perf_event__read_swap(union perf_event *event)
 474 {
 475         event->read.pid          = bswap_32(event->read.pid);
 476         event->read.tid          = bswap_32(event->read.tid);
 477         event->read.value        = bswap_64(event->read.value);
 478         event->read.time_enabled = bswap_64(event->read.time_enabled);
 479         event->read.time_running = bswap_64(event->read.time_running);
 480         event->read.id           = bswap_64(event->read.id);
 481 }
 482
 483 /* exported for swapping attributes in file header */
 484 void perf_event__attr_swap(struct perf_event_attr *attr)
 485 {
 486         attr->type              = bswap_32(attr->type);
 487         attr->size              = bswap_32(attr->size);
 488         attr->config            = bswap_64(attr->config);
 489         attr->sample_period     = bswap_64(attr->sample_period);
 490         attr->sample_type       = bswap_64(attr->sample_type);
 491         attr->read_format       = bswap_64(attr->read_format);
 492         attr->wakeup_events     = bswap_32(attr->wakeup_events);
 493         attr->bp_type           = bswap_32(attr->bp_type);
 494         attr->bp_addr           = bswap_64(attr->bp_addr);
 495         attr->bp_len            = bswap_64(attr->bp_len);
 496 }
 497
 498 static void perf_event__hdr_attr_swap(union perf_event *event)
 499 {
 500         size_t size;
 501
 502         perf_event__attr_swap(&event->attr.attr);
 503
 504         size = event->header.size;
 505         size -= (void *)&event->attr.id - (void *)event;
 506         mem_bswap_64(event->attr.id, size);
 507 }
 508
 509 static void perf_event__event_type_swap(union perf_event *event)
 510 {
 511         event->event_type.event_type.event_id =
 512                 bswap_64(event->event_type.event_type.event_id);
 513 }
 514
 515 static void perf_event__tracing_data_swap(union perf_event *event)
 516 {
 517         event->tracing_data.size = bswap_32(event->tracing_data.size);
 518 }
 519
 520 typedef void (*perf_event__swap_op)(union perf_event *event);
 521
 522 static perf_event__swap_op perf_event__swap_ops[] = {
 523         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 524         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 525         [PERF_RECORD_FORK]                = perf_event__task_swap,
 526         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 527         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 528         [PERF_RECORD_READ]                = perf_event__read_swap,
 529         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 530         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 531         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 532         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 533         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 534         [PERF_RECORD_HEADER_MAX]          = NULL,
 535 };
 536
 537 struct sample_queue {
 538         u64                     timestamp;
 539         u64                     file_offset;
 540         union perf_event        *event;
 541         struct list_head        list;
 542 };
 543
 544 static void perf_session_free_sample_buffers(struct perf_session *session)
 545 {
 546         struct ordered_samples *os = &session->ordered_samples;
 547
 548         while (!list_empty(&os->to_free)) {
 549                 struct sample_queue *sq;
 550
 551                 sq = list_entry(os->to_free.next, struct sample_queue, list);
 552                 list_del(&sq->list);
 553                 free(sq);
 554         }
 555 }
 556
 557 static int perf_session_deliver_event(struct perf_session *session,
 558                                       union perf_event *event,
 559                                       struct perf_sample *sample,
 560                                       struct perf_tool *tool,
 561                                       u64 file_offset);
 562
 563 static void flush_sample_queue(struct perf_session *s,
 564                                struct perf_tool *tool)
 565 {
 566         struct ordered_samples *os = &s->ordered_samples;
 567         struct list_head *head = &os->samples;
 568         struct sample_queue *tmp, *iter;
 569         struct perf_sample sample;
 570         u64 limit = os->next_flush;
 571         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 572         unsigned idx = 0, progress_next = os->nr_samples / 16;
 573         int ret;
 574
 575         if (!tool->ordered_samples || !limit)
 576                 return;
 577
 578         list_for_each_entry_safe(iter, tmp, head, list) {
 579                 if (iter->timestamp > limit)
 580                         break;
 581
 582                 ret = perf_session__parse_sample(s, iter->event, &sample);
 583                 if (ret)
 584                         pr_err("Can't parse sample, err = %d\n", ret);
 585                 else
 586                         perf_session_deliver_event(s, iter->event, &sample, tool,
 587                                                    iter->file_offset);
 588
 589                 os->last_flush = iter->timestamp;
 590                 list_del(&iter->list);
 591                 list_add(&iter->list, &os->sample_cache);
 592                 if (++idx >= progress_next) {
 593                         progress_next += os->nr_samples / 16;
 594                         ui_progress__update(idx, os->nr_samples,
 595                                             "Processing time ordered events...");
 596                 }
 597         }
 598
 599         if (list_empty(head)) {
 600                 os->last_sample = NULL;
 601         } else if (last_ts <= limit) {
 602                 os->last_sample =
 603                         list_entry(head->prev, struct sample_queue, list);
 604         }
 605
 606         os->nr_samples = 0;
 607 }
 608
 609 /*
 610  * When perf record finishes a pass on every buffers, it records this pseudo
 611  * event.
 612  * We record the max timestamp t found in the pass n.
 613  * Assuming these timestamps are monotonic across cpus, we know that if
 614  * a buffer still has events with timestamps below t, they will be all
 615  * available and then read in the pass n + 1.
 616  * Hence when we start to read the pass n + 2, we can safely flush every
 617  * events with timestamps below t.
 618  *
 619  *    ============ PASS n =================
 620  *       CPU 0         |   CPU 1
 621  *                     |
 622  *    cnt1 timestamps  |   cnt2 timestamps
 623  *          1          |         2
 624  *          2          |         3
 625  *          -          |         4  <--- max recorded
 626  *
 627  *    ============ PASS n + 1 ==============
 628  *       CPU 0         |   CPU 1
 629  *                     |
 630  *    cnt1 timestamps  |   cnt2 timestamps
 631  *          3          |         5
 632  *          4          |         6
 633  *          5          |         7 <---- max recorded
 634  *
 635  *      Flush every events below timestamp 4
 636  *
 637  *    ============ PASS n + 2 ==============
 638  *       CPU 0         |   CPU 1
 639  *                     |
 640  *    cnt1 timestamps  |   cnt2 timestamps
 641  *          6          |         8
 642  *          7          |         9
 643  *          -          |         10
 644  *
 645  *      Flush every events below timestamp 7
 646  *      etc...
 647  */
 648 static int process_finished_round(struct perf_tool *tool,
 649                                   union perf_event *event __used,
 650                                   struct perf_session *session)
 651 {
 652         flush_sample_queue(session, tool);
 653         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 654
 655         return 0;
 656 }
 657
 658 /* The queue is ordered by time */
 659 static void __queue_event(struct sample_queue *new, struct perf_session *s)
 660 {
 661         struct ordered_samples *os = &s->ordered_samples;
 662         struct sample_queue *sample = os->last_sample;
 663         u64 timestamp = new->timestamp;
 664         struct list_head *p;
 665
 666         ++os->nr_samples;
 667         os->last_sample = new;
 668
 669         if (!sample) {
 670                 list_add(&new->list, &os->samples);
 671                 os->max_timestamp = timestamp;
 672                 return;
 673         }
 674
 675         /*
 676          * last_sample might point to some random place in the list as it's
 677          * the last queued event. We expect that the new event is close to
 678          * this.
 679          */
 680         if (sample->timestamp <= timestamp) {
 681                 while (sample->timestamp <= timestamp) {
 682                         p = sample->list.next;
 683                         if (p == &os->samples) {
 684                                 list_add_tail(&new->list, &os->samples);
 685                                 os->max_timestamp = timestamp;
 686                                 return;
 687                         }
 688                         sample = list_entry(p, struct sample_queue, list);
 689                 }
 690                 list_add_tail(&new->list, &sample->list);
 691         } else {
 692                 while (sample->timestamp > timestamp) {
 693                         p = sample->list.prev;
 694                         if (p == &os->samples) {
 695                                 list_add(&new->list, &os->samples);
 696                                 return;
 697                         }
 698                         sample = list_entry(p, struct sample_queue, list);
 699                 }
 700                 list_add(&new->list, &sample->list);
 701         }
 702 }
 703
 704 #define MAX_SAMPLE_BUFFER       (64 * 1024 / sizeof(struct sample_queue))
 705
 706 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
 707                                     struct perf_sample *sample, u64 file_offset)
 708 {
 709         struct ordered_samples *os = &s->ordered_samples;
 710         struct list_head *sc = &os->sample_cache;
 711         u64 timestamp = sample->time;
 712         struct sample_queue *new;
 713
 714         if (!timestamp || timestamp == ~0ULL)
 715                 return -ETIME;
 716
 717         if (timestamp < s->ordered_samples.last_flush) {
 718                 printf("Warning: Timestamp below last timeslice flush\n");
 719                 return -EINVAL;
 720         }
 721
 722         if (!list_empty(sc)) {
 723                 new = list_entry(sc->next, struct sample_queue, list);
 724                 list_del(&new->list);
 725         } else if (os->sample_buffer) {
 726                 new = os->sample_buffer + os->sample_buffer_idx;
 727                 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
 728                         os->sample_buffer = NULL;
 729         } else {
 730                 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
 731                 if (!os->sample_buffer)
 732                         return -ENOMEM;
 733                 list_add(&os->sample_buffer->list, &os->to_free);
 734                 os->sample_buffer_idx = 2;
 735                 new = os->sample_buffer + 1;
 736         }
 737
 738         new->timestamp = timestamp;
 739         new->file_offset = file_offset;
 740         new->event = event;
 741
 742         __queue_event(new, s);
 743
 744         return 0;
 745 }
 746
 747 static void callchain__printf(struct perf_sample *sample)
 748 {
 749         unsigned int i;
 750
 751         printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
 752
 753         for (i = 0; i < sample->callchain->nr; i++)
 754                 printf("..... %2d: %016" PRIx64 "\n",
 755                        i, sample->callchain->ips[i]);
 756 }
 757
 758 static void branch_stack__printf(struct perf_sample *sample)
 759 {
 760         uint64_t i;
 761
 762         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
 763
 764         for (i = 0; i < sample->branch_stack->nr; i++)
 765                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
 766                         i, sample->branch_stack->entries[i].from,
 767                         sample->branch_stack->entries[i].to);
 768 }
 769
 770 static void perf_session__print_tstamp(struct perf_session *session,
 771                                        union perf_event *event,
 772                                        struct perf_sample *sample)
 773 {
 774         if (event->header.type != PERF_RECORD_SAMPLE &&
 775             !session->sample_id_all) {
 776                 fputs("-1 -1 ", stdout);
 777                 return;
 778         }
 779
 780         if ((session->sample_type & PERF_SAMPLE_CPU))
 781                 printf("%u ", sample->cpu);
 782
 783         if (session->sample_type & PERF_SAMPLE_TIME)
 784                 printf("%" PRIu64 " ", sample->time);
 785 }
 786
 787 static void dump_event(struct perf_session *session, union perf_event *event,
 788                        u64 file_offset, struct perf_sample *sample)
 789 {
 790         if (!dump_trace)
 791                 return;
 792
 793         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 794                file_offset, event->header.size, event->header.type);
 795
 796         trace_event(event);
 797
 798         if (sample)
 799                 perf_session__print_tstamp(session, event, sample);
 800
 801         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 802                event->header.size, perf_event__name(event->header.type));
 803 }
 804
 805 static void dump_sample(struct perf_session *session, union perf_event *event,
 806                         struct perf_sample *sample)
 807 {
 808         if (!dump_trace)
 809                 return;
 810
 811         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 812                event->header.misc, sample->pid, sample->tid, sample->ip,
 813                sample->period, sample->addr);
 814
 815         if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
 816                 callchain__printf(sample);
 817
 818         if (session->sample_type & PERF_SAMPLE_BRANCH_STACK)
 819                 branch_stack__printf(sample);
 820 }
 821
 822 static struct machine *
 823         perf_session__find_machine_for_cpumode(struct perf_session *session,
 824                                                union perf_event *event)
 825 {
 826         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 827
 828         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest)
 829                 return perf_session__find_machine(session, event->ip.pid);
 830
 831         return perf_session__find_host_machine(session);
 832 }
 833
 834 static int perf_session_deliver_event(struct perf_session *session,
 835                                       union perf_event *event,
 836                                       struct perf_sample *sample,
 837                                       struct perf_tool *tool,
 838                                       u64 file_offset)
 839 {
 840         struct perf_evsel *evsel;
 841         struct machine *machine;
 842
 843         dump_event(session, event, file_offset, sample);
 844
 845         evsel = perf_evlist__id2evsel(session->evlist, sample->id);
 846         if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
 847                 /*
 848                  * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
 849                  * because the tools right now may apply filters, discarding
 850                  * some of the samples. For consistency, in the future we
 851                  * should have something like nr_filtered_samples and remove
 852                  * the sample->period from total_sample_period, etc, KISS for
 853                  * now tho.
 854                  *
 855                  * Also testing against NULL allows us to handle files without
 856                  * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
 857                  * future probably it'll be a good idea to restrict event
 858                  * processing via perf_session to files with both set.
 859                  */
 860                 hists__inc_nr_events(&evsel->hists, event->header.type);
 861         }
 862
 863         machine = perf_session__find_machine_for_cpumode(session, event);
 864
 865         switch (event->header.type) {
 866         case PERF_RECORD_SAMPLE:
 867                 dump_sample(session, event, sample);
 868                 if (evsel == NULL) {
 869                         ++session->hists.stats.nr_unknown_id;
 870                         return -1;
 871                 }
 872                 if (machine == NULL) {
 873                         ++session->hists.stats.nr_unprocessable_samples;
 874                         return -1;
 875                 }
 876                 return tool->sample(tool, event, sample, evsel, machine);
 877         case PERF_RECORD_MMAP:
 878                 return tool->mmap(tool, event, sample, machine);
 879         case PERF_RECORD_COMM:
 880                 return tool->comm(tool, event, sample, machine);
 881         case PERF_RECORD_FORK:
 882                 return tool->fork(tool, event, sample, machine);
 883         case PERF_RECORD_EXIT:
 884                 return tool->exit(tool, event, sample, machine);
 885         case PERF_RECORD_LOST:
 886                 if (tool->lost == perf_event__process_lost)
 887                         session->hists.stats.total_lost += event->lost.lost;
 888                 return tool->lost(tool, event, sample, machine);
 889         case PERF_RECORD_READ:
 890                 return tool->read(tool, event, sample, evsel, machine);
 891         case PERF_RECORD_THROTTLE:
 892                 return tool->throttle(tool, event, sample, machine);
 893         case PERF_RECORD_UNTHROTTLE:
 894                 return tool->unthrottle(tool, event, sample, machine);
 895         default:
 896                 ++session->hists.stats.nr_unknown_events;
 897                 return -1;
 898         }
 899 }
 900
 901 static int perf_session__preprocess_sample(struct perf_session *session,
 902                                            union perf_event *event, struct perf_sample *sample)
 903 {
 904         if (event->header.type != PERF_RECORD_SAMPLE ||
 905             !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
 906                 return 0;
 907
 908         if (!ip_callchain__valid(sample->callchain, event)) {
 909                 pr_debug("call-chain problem with event, skipping it.\n");
 910                 ++session->hists.stats.nr_invalid_chains;
 911                 session->hists.stats.total_invalid_chains += sample->period;
 912                 return -EINVAL;
 913         }
 914         return 0;
 915 }
 916
 917 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
 918                                             struct perf_tool *tool, u64 file_offset)
 919 {
 920         int err;
 921
 922         dump_event(session, event, file_offset, NULL);
 923
 924         /* These events are processed right away */
 925         switch (event->header.type) {
 926         case PERF_RECORD_HEADER_ATTR:
 927                 err = tool->attr(event, &session->evlist);
 928                 if (err == 0)
 929                         perf_session__update_sample_type(session);
 930                 return err;
 931         case PERF_RECORD_HEADER_EVENT_TYPE:
 932                 return tool->event_type(tool, event);
 933         case PERF_RECORD_HEADER_TRACING_DATA:
 934                 /* setup for reading amidst mmap */
 935                 lseek(session->fd, file_offset, SEEK_SET);
 936                 return tool->tracing_data(event, session);
 937         case PERF_RECORD_HEADER_BUILD_ID:
 938                 return tool->build_id(tool, event, session);
 939         case PERF_RECORD_FINISHED_ROUND:
 940                 return tool->finished_round(tool, event, session);
 941         default:
 942                 return -EINVAL;
 943         }
 944 }
 945
 946 static int perf_session__process_event(struct perf_session *session,
 947                                        union perf_event *event,
 948                                        struct perf_tool *tool,
 949                                        u64 file_offset)
 950 {
 951         struct perf_sample sample;
 952         int ret;
 953
 954         if (session->header.needs_swap &&
 955             perf_event__swap_ops[event->header.type])
 956                 perf_event__swap_ops[event->header.type](event);
 957
 958         if (event->header.type >= PERF_RECORD_HEADER_MAX)
 959                 return -EINVAL;
 960
 961         hists__inc_nr_events(&session->hists, event->header.type);
 962
 963         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
 964                 return perf_session__process_user_event(session, event, tool, file_offset);
 965
 966         /*
 967          * For all kernel events we get the sample data
 968          */
 969         ret = perf_session__parse_sample(session, event, &sample);
 970         if (ret)
 971                 return ret;
 972
 973         /* Preprocess sample records - precheck callchains */
 974         if (perf_session__preprocess_sample(session, event, &sample))
 975                 return 0;
 976
 977         if (tool->ordered_samples) {
 978                 ret = perf_session_queue_event(session, event, &sample,
 979                                                file_offset);
 980                 if (ret != -ETIME)
 981                         return ret;
 982         }
 983
 984         return perf_session_deliver_event(session, event, &sample, tool,
 985                                           file_offset);
 986 }
 987
 988 void perf_event_header__bswap(struct perf_event_header *self)
 989 {
 990         self->type = bswap_32(self->type);
 991         self->misc = bswap_16(self->misc);
 992         self->size = bswap_16(self->size);
 993 }
 994
 995 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
 996 {
 997         return machine__findnew_thread(&session->host_machine, pid);
 998 }
 999
1000 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
1001 {
1002         struct thread *thread = perf_session__findnew(self, 0);
1003
1004         if (thread == NULL || thread__set_comm(thread, "swapper")) {
1005                 pr_err("problem inserting idle task.\n");
1006                 thread = NULL;
1007         }
1008
1009         return thread;
1010 }
1011
1012 static void perf_session__warn_about_errors(const struct perf_session *session,
1013                                             const struct perf_tool *tool)
1014 {
1015         if (tool->lost == perf_event__process_lost &&
1016             session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) {
1017                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1018                             "Check IO/CPU overload!\n\n",
1019                             session->hists.stats.nr_events[0],
1020                             session->hists.stats.nr_events[PERF_RECORD_LOST]);
1021         }
1022
1023         if (session->hists.stats.nr_unknown_events != 0) {
1024                 ui__warning("Found %u unknown events!\n\n"
1025                             "Is this an older tool processing a perf.data "
1026                             "file generated by a more recent tool?\n\n"
1027                             "If that is not the case, consider "
1028                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1029                             session->hists.stats.nr_unknown_events);
1030         }
1031
1032         if (session->hists.stats.nr_unknown_id != 0) {
1033                 ui__warning("%u samples with id not present in the header\n",
1034                             session->hists.stats.nr_unknown_id);
1035         }
1036
1037         if (session->hists.stats.nr_invalid_chains != 0) {
1038                 ui__warning("Found invalid callchains!\n\n"
1039                             "%u out of %u events were discarded for this reason.\n\n"
1040                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1041                             session->hists.stats.nr_invalid_chains,
1042                             session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
1043         }
1044
1045         if (session->hists.stats.nr_unprocessable_samples != 0) {
1046                 ui__warning("%u unprocessable samples recorded.\n"
1047                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1048                             session->hists.stats.nr_unprocessable_samples);
1049         }
1050 }
1051
1052 #define session_done()  (*(volatile int *)(&session_done))
1053 volatile int session_done;
1054
1055 static int __perf_session__process_pipe_events(struct perf_session *self,
1056                                                struct perf_tool *tool)
1057 {
1058         union perf_event event;
1059         uint32_t size;
1060         int skip = 0;
1061         u64 head;
1062         int err;
1063         void *p;
1064
1065         perf_tool__fill_defaults(tool);
1066
1067         head = 0;
1068 more:
1069         err = readn(self->fd, &event, sizeof(struct perf_event_header));
1070         if (err <= 0) {
1071                 if (err == 0)
1072                         goto done;
1073
1074                 pr_err("failed to read event header\n");
1075                 goto out_err;
1076         }
1077
1078         if (self->header.needs_swap)
1079                 perf_event_header__bswap(&event.header);
1080
1081         size = event.header.size;
1082         if (size == 0)
1083                 size = 8;
1084
1085         p = &event;
1086         p += sizeof(struct perf_event_header);
1087
1088         if (size - sizeof(struct perf_event_header)) {
1089                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1090                 if (err <= 0) {
1091                         if (err == 0) {
1092                                 pr_err("unexpected end of event stream\n");
1093                                 goto done;
1094                         }
1095
1096                         pr_err("failed to read event data\n");
1097                         goto out_err;
1098                 }
1099         }
1100
1101         if ((skip = perf_session__process_event(self, &event, tool, head)) < 0) {
1102                 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1103                             head, event.header.size, event.header.type);
1104                 /*
1105                  * assume we lost track of the stream, check alignment, and
1106                  * increment a single u64 in the hope to catch on again 'soon'.
1107                  */
1108                 if (unlikely(head & 7))
1109                         head &= ~7ULL;
1110
1111                 size = 8;
1112         }
1113
1114         head += size;
1115
1116         if (skip > 0)
1117                 head += skip;
1118
1119         if (!session_done())
1120                 goto more;
1121 done:
1122         err = 0;
1123 out_err:
1124         perf_session__warn_about_errors(self, tool);
1125         perf_session_free_sample_buffers(self);
1126         return err;
1127 }
1128
1129 static union perf_event *
1130 fetch_mmaped_event(struct perf_session *session,
1131                    u64 head, size_t mmap_size, char *buf)
1132 {
1133         union perf_event *event;
1134
1135         /*
1136          * Ensure we have enough space remaining to read
1137          * the size of the event in the headers.
1138          */
1139         if (head + sizeof(event->header) > mmap_size)
1140                 return NULL;
1141
1142         event = (union perf_event *)(buf + head);
1143
1144         if (session->header.needs_swap)
1145                 perf_event_header__bswap(&event->header);
1146
1147         if (head + event->header.size > mmap_size)
1148                 return NULL;
1149
1150         return event;
1151 }
1152
1153 int __perf_session__process_events(struct perf_session *session,
1154                                    u64 data_offset, u64 data_size,
1155                                    u64 file_size, struct perf_tool *tool)
1156 {
1157         u64 head, page_offset, file_offset, file_pos, progress_next;
1158         int err, mmap_prot, mmap_flags, map_idx = 0;
1159         size_t  page_size, mmap_size;
1160         char *buf, *mmaps[8];
1161         union perf_event *event;
1162         uint32_t size;
1163
1164         perf_tool__fill_defaults(tool);
1165
1166         page_size = sysconf(_SC_PAGESIZE);
1167
1168         page_offset = page_size * (data_offset / page_size);
1169         file_offset = page_offset;
1170         head = data_offset - page_offset;
1171
1172         if (data_offset + data_size < file_size)
1173                 file_size = data_offset + data_size;
1174
1175         progress_next = file_size / 16;
1176
1177         mmap_size = session->mmap_window;
1178         if (mmap_size > file_size)
1179                 mmap_size = file_size;
1180
1181         memset(mmaps, 0, sizeof(mmaps));
1182
1183         mmap_prot  = PROT_READ;
1184         mmap_flags = MAP_SHARED;
1185
1186         if (session->header.needs_swap) {
1187                 mmap_prot  |= PROT_WRITE;
1188                 mmap_flags = MAP_PRIVATE;
1189         }
1190 remap:
1191         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1192                    file_offset);
1193         if (buf == MAP_FAILED) {
1194                 pr_err("failed to mmap file\n");
1195                 err = -errno;
1196                 goto out_err;
1197         }
1198         mmaps[map_idx] = buf;
1199         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1200         file_pos = file_offset + head;
1201
1202 more:
1203         event = fetch_mmaped_event(session, head, mmap_size, buf);
1204         if (!event) {
1205                 if (mmaps[map_idx]) {
1206                         munmap(mmaps[map_idx], mmap_size);
1207                         mmaps[map_idx] = NULL;
1208                 }
1209
1210                 page_offset = page_size * (head / page_size);
1211                 file_offset += page_offset;
1212                 head -= page_offset;
1213                 goto remap;
1214         }
1215
1216         size = event->header.size;
1217
1218         if (size == 0 ||
1219             perf_session__process_event(session, event, tool, file_pos) < 0) {
1220                 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1221                             file_offset + head, event->header.size,
1222                             event->header.type);
1223                 /*
1224                  * assume we lost track of the stream, check alignment, and
1225                  * increment a single u64 in the hope to catch on again 'soon'.
1226                  */
1227                 if (unlikely(head & 7))
1228                         head &= ~7ULL;
1229
1230                 size = 8;
1231         }
1232
1233         head += size;
1234         file_pos += size;
1235
1236         if (file_pos >= progress_next) {
1237                 progress_next += file_size / 16;
1238                 ui_progress__update(file_pos, file_size,
1239                                     "Processing events...");
1240         }
1241
1242         if (file_pos < file_size)
1243                 goto more;
1244
1245         err = 0;
1246         /* do the final flush for ordered samples */
1247         session->ordered_samples.next_flush = ULLONG_MAX;
1248         flush_sample_queue(session, tool);
1249 out_err:
1250         perf_session__warn_about_errors(session, tool);
1251         perf_session_free_sample_buffers(session);
1252         return err;
1253 }
1254
1255 int perf_session__process_events(struct perf_session *self,
1256                                  struct perf_tool *tool)
1257 {
1258         int err;
1259
1260         if (perf_session__register_idle_thread(self) == NULL)
1261                 return -ENOMEM;
1262
1263         if (!self->fd_pipe)
1264                 err = __perf_session__process_events(self,
1265                                                      self->header.data_offset,
1266                                                      self->header.data_size,
1267                                                      self->size, tool);
1268         else
1269                 err = __perf_session__process_pipe_events(self, tool);
1270
1271         return err;
1272 }
1273
1274 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1275 {
1276         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1277                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1278                 return false;
1279         }
1280
1281         return true;
1282 }
1283
1284 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1285                                      const char *symbol_name, u64 addr)
1286 {
1287         char *bracket;
1288         enum map_type i;
1289         struct ref_reloc_sym *ref;
1290
1291         ref = zalloc(sizeof(struct ref_reloc_sym));
1292         if (ref == NULL)
1293                 return -ENOMEM;
1294
1295         ref->name = strdup(symbol_name);
1296         if (ref->name == NULL) {
1297                 free(ref);
1298                 return -ENOMEM;
1299         }
1300
1301         bracket = strchr(ref->name, ']');
1302         if (bracket)
1303                 *bracket = '\0';
1304
1305         ref->addr = addr;
1306
1307         for (i = 0; i < MAP__NR_TYPES; ++i) {
1308                 struct kmap *kmap = map__kmap(maps[i]);
1309                 kmap->ref_reloc_sym = ref;
1310         }
1311
1312         return 0;
1313 }
1314
1315 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1316 {
1317         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1318                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1319                machines__fprintf_dsos(&self->machines, fp);
1320 }
1321
1322 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1323                                           bool with_hits)
1324 {
1325         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1326         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1327 }
1328
1329 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1330 {
1331         struct perf_evsel *pos;
1332         size_t ret = fprintf(fp, "Aggregated stats:\n");
1333
1334         ret += hists__fprintf_nr_events(&session->hists, fp);
1335
1336         list_for_each_entry(pos, &session->evlist->entries, node) {
1337                 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1338                 ret += hists__fprintf_nr_events(&pos->hists, fp);
1339         }
1340
1341         return ret;
1342 }
1343
1344 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1345 {
1346         /*
1347          * FIXME: Here we have to actually print all the machines in this
1348          * session, not just the host...
1349          */
1350         return machine__fprintf(&session->host_machine, fp);
1351 }
1352
1353 void perf_session__remove_thread(struct perf_session *session,
1354                                  struct thread *th)
1355 {
1356         /*
1357          * FIXME: This one makes no sense, we need to remove the thread from
1358          * the machine it belongs to, perf_session can have many machines, so
1359          * doing it always on ->host_machine is wrong.  Fix when auditing all
1360          * the 'perf kvm' code.
1361          */
1362         machine__remove_thread(&session->host_machine, th);
1363 }
1364
1365 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1366                                               unsigned int type)
1367 {
1368         struct perf_evsel *pos;
1369
1370         list_for_each_entry(pos, &session->evlist->entries, node) {
1371                 if (pos->attr.type == type)
1372                         return pos;
1373         }
1374         return NULL;
1375 }
1376
1377 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
1378                           struct machine *machine, struct perf_evsel *evsel,
1379                           int print_sym, int print_dso, int print_symoffset)
1380 {
1381         struct addr_location al;
1382         struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
1383         struct callchain_cursor_node *node;
1384
1385         if (perf_event__preprocess_sample(event, machine, &al, sample,
1386                                           NULL) < 0) {
1387                 error("problem processing %d event, skipping it.\n",
1388                         event->header.type);
1389                 return;
1390         }
1391
1392         if (symbol_conf.use_callchain && sample->callchain) {
1393
1394                 if (machine__resolve_callchain(machine, evsel, al.thread,
1395                                                 sample->callchain, NULL) != 0) {
1396                         if (verbose)
1397                                 error("Failed to resolve callchain. Skipping\n");
1398                         return;
1399                 }
1400                 callchain_cursor_commit(cursor);
1401
1402                 while (1) {
1403                         node = callchain_cursor_current(cursor);
1404                         if (!node)
1405                                 break;
1406
1407                         printf("\t%16" PRIx64, node->ip);
1408                         if (print_sym) {
1409                                 printf(" ");
1410                                 symbol__fprintf_symname(node->sym, stdout);
1411                         }
1412                         if (print_dso) {
1413                                 printf(" (");
1414                                 map__fprintf_dsoname(al.map, stdout);
1415                                 printf(")");
1416                         }
1417                         printf("\n");
1418
1419                         callchain_cursor_advance(cursor);
1420                 }
1421
1422         } else {
1423                 printf("%16" PRIx64, sample->ip);
1424                 if (print_sym) {
1425                         printf(" ");
1426                         if (print_symoffset)
1427                                 symbol__fprintf_symname_offs(al.sym, &al,
1428                                                              stdout);
1429                         else
1430                                 symbol__fprintf_symname(al.sym, stdout);
1431                 }
1432
1433                 if (print_dso) {
1434                         printf(" (");
1435                         map__fprintf_dsoname(al.map, stdout);
1436                         printf(")");
1437                 }
1438         }
1439 }
1440
1441 int perf_session__cpu_bitmap(struct perf_session *session,
1442                              const char *cpu_list, unsigned long *cpu_bitmap)
1443 {
1444         int i;
1445         struct cpu_map *map;
1446
1447         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1448                 struct perf_evsel *evsel;
1449
1450                 evsel = perf_session__find_first_evtype(session, i);
1451                 if (!evsel)
1452                         continue;
1453
1454                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1455                         pr_err("File does not contain CPU events. "
1456                                "Remove -c option to proceed.\n");
1457                         return -1;
1458                 }
1459         }
1460
1461         map = cpu_map__new(cpu_list);
1462         if (map == NULL) {
1463                 pr_err("Invalid cpu_list\n");
1464                 return -1;
1465         }
1466
1467         for (i = 0; i < map->nr; i++) {
1468                 int cpu = map->map[i];
1469
1470                 if (cpu >= MAX_NR_CPUS) {
1471                         pr_err("Requested CPU %d too large. "
1472                                "Consider raising MAX_NR_CPUS\n", cpu);
1473                         return -1;
1474                 }
1475
1476                 set_bit(cpu, cpu_bitmap);
1477         }
1478
1479         return 0;
1480 }
1481
1482 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1483                                 bool full)
1484 {
1485         struct stat st;
1486         int ret;
1487
1488         if (session == NULL || fp == NULL)
1489                 return;
1490
1491         ret = fstat(session->fd, &st);
1492         if (ret == -1)
1493                 return;
1494
1495         fprintf(fp, "# ========\n");
1496         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1497         perf_header__fprintf_info(session, fp, full);
1498         fprintf(fp, "# ========\n#\n");
1499 }