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         hists__init(&self->hists);
 144
 145         if (mode == O_RDONLY) {
 146                 if (perf_session__open(self, force) < 0)
 147                         goto out_delete;
 148                 perf_session__update_sample_type(self);
 149         } else if (mode == O_WRONLY) {
 150                 /*
 151                  * In O_RDONLY mode this will be performed when reading the
 152                  * kernel MMAP event, in perf_event__process_mmap().
 153                  */
 154                 if (perf_session__create_kernel_maps(self) < 0)
 155                         goto out_delete;
 156         }
 157
 158         if (tool && tool->ordering_requires_timestamps &&
 159             tool->ordered_samples && !self->sample_id_all) {
 160                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 161                 tool->ordered_samples = false;
 162         }
 163
 164 out:
 165         return self;
 166 out_delete:
 167         perf_session__delete(self);
 168         return NULL;
 169 }
 170
 171 static void machine__delete_dead_threads(struct machine *machine)
 172 {
 173         struct thread *n, *t;
 174
 175         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
 176                 list_del(&t->node);
 177                 thread__delete(t);
 178         }
 179 }
 180
 181 static void perf_session__delete_dead_threads(struct perf_session *session)
 182 {
 183         machine__delete_dead_threads(&session->host_machine);
 184 }
 185
 186 static void machine__delete_threads(struct machine *self)
 187 {
 188         struct rb_node *nd = rb_first(&self->threads);
 189
 190         while (nd) {
 191                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 192
 193                 rb_erase(&t->rb_node, &self->threads);
 194                 nd = rb_next(nd);
 195                 thread__delete(t);
 196         }
 197 }
 198
 199 static void perf_session__delete_threads(struct perf_session *session)
 200 {
 201         machine__delete_threads(&session->host_machine);
 202 }
 203
 204 void perf_session__delete(struct perf_session *self)
 205 {
 206         perf_session__destroy_kernel_maps(self);
 207         perf_session__delete_dead_threads(self);
 208         perf_session__delete_threads(self);
 209         machine__exit(&self->host_machine);
 210         close(self->fd);
 211         free(self);
 212 }
 213
 214 void machine__remove_thread(struct machine *self, struct thread *th)
 215 {
 216         self->last_match = NULL;
 217         rb_erase(&th->rb_node, &self->threads);
 218         /*
 219          * We may have references to this thread, for instance in some hist_entry
 220          * instances, so just move them to a separate list.
 221          */
 222         list_add_tail(&th->node, &self->dead_threads);
 223 }
 224
 225 static bool symbol__match_parent_regex(struct symbol *sym)
 226 {
 227         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 228                 return 1;
 229
 230         return 0;
 231 }
 232
 233 static const u8 cpumodes[] = {
 234         PERF_RECORD_MISC_USER,
 235         PERF_RECORD_MISC_KERNEL,
 236         PERF_RECORD_MISC_GUEST_USER,
 237         PERF_RECORD_MISC_GUEST_KERNEL
 238 };
 239 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8))
 240
 241 static void ip__resolve_ams(struct machine *self, struct thread *thread,
 242                             struct addr_map_symbol *ams,
 243                             u64 ip)
 244 {
 245         struct addr_location al;
 246         size_t i;
 247         u8 m;
 248
 249         memset(&al, 0, sizeof(al));
 250
 251         for (i = 0; i < NCPUMODES; i++) {
 252                 m = cpumodes[i];
 253                 /*
 254                  * We cannot use the header.misc hint to determine whether a
 255                  * branch stack address is user, kernel, guest, hypervisor.
 256                  * Branches may straddle the kernel/user/hypervisor boundaries.
 257                  * Thus, we have to try consecutively until we find a match
 258                  * or else, the symbol is unknown
 259                  */
 260                 thread__find_addr_location(thread, self, m, MAP__FUNCTION,
 261                                 ip, &al, NULL);
 262                 if (al.sym)
 263                         goto found;
 264         }
 265 found:
 266         ams->addr = ip;
 267         ams->al_addr = al.addr;
 268         ams->sym = al.sym;
 269         ams->map = al.map;
 270 }
 271
 272 struct branch_info *machine__resolve_bstack(struct machine *self,
 273                                             struct thread *thr,
 274                                             struct branch_stack *bs)
 275 {
 276         struct branch_info *bi;
 277         unsigned int i;
 278
 279         bi = calloc(bs->nr, sizeof(struct branch_info));
 280         if (!bi)
 281                 return NULL;
 282
 283         for (i = 0; i < bs->nr; i++) {
 284                 ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to);
 285                 ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from);
 286                 bi[i].flags = bs->entries[i].flags;
 287         }
 288         return bi;
 289 }
 290
 291 int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
 292                                struct thread *thread,
 293                                struct ip_callchain *chain,
 294                                struct symbol **parent)
 295 {
 296         u8 cpumode = PERF_RECORD_MISC_USER;
 297         unsigned int i;
 298         int err;
 299
 300         callchain_cursor_reset(&evsel->hists.callchain_cursor);
 301
 302         for (i = 0; i < chain->nr; i++) {
 303                 u64 ip;
 304                 struct addr_location al;
 305
 306                 if (callchain_param.order == ORDER_CALLEE)
 307                         ip = chain->ips[i];
 308                 else
 309                         ip = chain->ips[chain->nr - i - 1];
 310
 311                 if (ip >= PERF_CONTEXT_MAX) {
 312                         switch (ip) {
 313                         case PERF_CONTEXT_HV:
 314                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 315                         case PERF_CONTEXT_KERNEL:
 316                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 317                         case PERF_CONTEXT_USER:
 318                                 cpumode = PERF_RECORD_MISC_USER;        break;
 319                         default:
 320                                 break;
 321                         }
 322                         continue;
 323                 }
 324
 325                 al.filtered = false;
 326                 thread__find_addr_location(thread, self, cpumode,
 327                                            MAP__FUNCTION, ip, &al, NULL);
 328                 if (al.sym != NULL) {
 329                         if (sort__has_parent && !*parent &&
 330                             symbol__match_parent_regex(al.sym))
 331                                 *parent = al.sym;
 332                         if (!symbol_conf.use_callchain)
 333                                 break;
 334                 }
 335
 336                 err = callchain_cursor_append(&evsel->hists.callchain_cursor,
 337                                               ip, al.map, al.sym);
 338                 if (err)
 339                         return err;
 340         }
 341
 342         return 0;
 343 }
 344
 345 static int process_event_synth_tracing_data_stub(union perf_event *event __used,
 346                                                  struct perf_session *session __used)
 347 {
 348         dump_printf(": unhandled!\n");
 349         return 0;
 350 }
 351
 352 static int process_event_synth_attr_stub(union perf_event *event __used,
 353                                          struct perf_evlist **pevlist __used)
 354 {
 355         dump_printf(": unhandled!\n");
 356         return 0;
 357 }
 358
 359 static int process_event_sample_stub(struct perf_tool *tool __used,
 360                                      union perf_event *event __used,
 361                                      struct perf_sample *sample __used,
 362                                      struct perf_evsel *evsel __used,
 363                                      struct machine *machine __used)
 364 {
 365         dump_printf(": unhandled!\n");
 366         return 0;
 367 }
 368
 369 static int process_event_stub(struct perf_tool *tool __used,
 370                               union perf_event *event __used,
 371                               struct perf_sample *sample __used,
 372                               struct machine *machine __used)
 373 {
 374         dump_printf(": unhandled!\n");
 375         return 0;
 376 }
 377
 378 static int process_finished_round_stub(struct perf_tool *tool __used,
 379                                        union perf_event *event __used,
 380                                        struct perf_session *perf_session __used)
 381 {
 382         dump_printf(": unhandled!\n");
 383         return 0;
 384 }
 385
 386 static int process_event_type_stub(struct perf_tool *tool __used,
 387                                    union perf_event *event __used)
 388 {
 389         dump_printf(": unhandled!\n");
 390         return 0;
 391 }
 392
 393 static int process_finished_round(struct perf_tool *tool,
 394                                   union perf_event *event,
 395                                   struct perf_session *session);
 396
 397 static void perf_tool__fill_defaults(struct perf_tool *tool)
 398 {
 399         if (tool->sample == NULL)
 400                 tool->sample = process_event_sample_stub;
 401         if (tool->mmap == NULL)
 402                 tool->mmap = process_event_stub;
 403         if (tool->comm == NULL)
 404                 tool->comm = process_event_stub;
 405         if (tool->fork == NULL)
 406                 tool->fork = process_event_stub;
 407         if (tool->exit == NULL)
 408                 tool->exit = process_event_stub;
 409         if (tool->lost == NULL)
 410                 tool->lost = perf_event__process_lost;
 411         if (tool->read == NULL)
 412                 tool->read = process_event_sample_stub;
 413         if (tool->throttle == NULL)
 414                 tool->throttle = process_event_stub;
 415         if (tool->unthrottle == NULL)
 416                 tool->unthrottle = process_event_stub;
 417         if (tool->attr == NULL)
 418                 tool->attr = process_event_synth_attr_stub;
 419         if (tool->event_type == NULL)
 420                 tool->event_type = process_event_type_stub;
 421         if (tool->tracing_data == NULL)
 422                 tool->tracing_data = process_event_synth_tracing_data_stub;
 423         if (tool->build_id == NULL)
 424                 tool->build_id = process_finished_round_stub;
 425         if (tool->finished_round == NULL) {
 426                 if (tool->ordered_samples)
 427                         tool->finished_round = process_finished_round;
 428                 else
 429                         tool->finished_round = process_finished_round_stub;
 430         }
 431 }
 432
 433 void mem_bswap_64(void *src, int byte_size)
 434 {
 435         u64 *m = src;
 436
 437         while (byte_size > 0) {
 438                 *m = bswap_64(*m);
 439                 byte_size -= sizeof(u64);
 440                 ++m;
 441         }
 442 }
 443
 444 static void perf_event__all64_swap(union perf_event *event)
 445 {
 446         struct perf_event_header *hdr = &event->header;
 447         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 448 }
 449
 450 static void perf_event__comm_swap(union perf_event *event)
 451 {
 452         event->comm.pid = bswap_32(event->comm.pid);
 453         event->comm.tid = bswap_32(event->comm.tid);
 454 }
 455
 456 static void perf_event__mmap_swap(union perf_event *event)
 457 {
 458         event->mmap.pid   = bswap_32(event->mmap.pid);
 459         event->mmap.tid   = bswap_32(event->mmap.tid);
 460         event->mmap.start = bswap_64(event->mmap.start);
 461         event->mmap.len   = bswap_64(event->mmap.len);
 462         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 463 }
 464
 465 static void perf_event__task_swap(union perf_event *event)
 466 {
 467         event->fork.pid  = bswap_32(event->fork.pid);
 468         event->fork.tid  = bswap_32(event->fork.tid);
 469         event->fork.ppid = bswap_32(event->fork.ppid);
 470         event->fork.ptid = bswap_32(event->fork.ptid);
 471         event->fork.time = bswap_64(event->fork.time);
 472 }
 473
 474 static void perf_event__read_swap(union perf_event *event)
 475 {
 476         event->read.pid          = bswap_32(event->read.pid);
 477         event->read.tid          = bswap_32(event->read.tid);
 478         event->read.value        = bswap_64(event->read.value);
 479         event->read.time_enabled = bswap_64(event->read.time_enabled);
 480         event->read.time_running = bswap_64(event->read.time_running);
 481         event->read.id           = bswap_64(event->read.id);
 482 }
 483
 484 /* exported for swapping attributes in file header */
 485 void perf_event__attr_swap(struct perf_event_attr *attr)
 486 {
 487         attr->type              = bswap_32(attr->type);
 488         attr->size              = bswap_32(attr->size);
 489         attr->config            = bswap_64(attr->config);
 490         attr->sample_period     = bswap_64(attr->sample_period);
 491         attr->sample_type       = bswap_64(attr->sample_type);
 492         attr->read_format       = bswap_64(attr->read_format);
 493         attr->wakeup_events     = bswap_32(attr->wakeup_events);
 494         attr->bp_type           = bswap_32(attr->bp_type);
 495         attr->bp_addr           = bswap_64(attr->bp_addr);
 496         attr->bp_len            = bswap_64(attr->bp_len);
 497 }
 498
 499 static void perf_event__hdr_attr_swap(union perf_event *event)
 500 {
 501         size_t size;
 502
 503         perf_event__attr_swap(&event->attr.attr);
 504
 505         size = event->header.size;
 506         size -= (void *)&event->attr.id - (void *)event;
 507         mem_bswap_64(event->attr.id, size);
 508 }
 509
 510 static void perf_event__event_type_swap(union perf_event *event)
 511 {
 512         event->event_type.event_type.event_id =
 513                 bswap_64(event->event_type.event_type.event_id);
 514 }
 515
 516 static void perf_event__tracing_data_swap(union perf_event *event)
 517 {
 518         event->tracing_data.size = bswap_32(event->tracing_data.size);
 519 }
 520
 521 typedef void (*perf_event__swap_op)(union perf_event *event);
 522
 523 static perf_event__swap_op perf_event__swap_ops[] = {
 524         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 525         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 526         [PERF_RECORD_FORK]                = perf_event__task_swap,
 527         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 528         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 529         [PERF_RECORD_READ]                = perf_event__read_swap,
 530         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 531         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 532         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 533         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 534         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 535         [PERF_RECORD_HEADER_MAX]          = NULL,
 536 };
 537
 538 struct sample_queue {
 539         u64                     timestamp;
 540         u64                     file_offset;
 541         union perf_event        *event;
 542         struct list_head        list;
 543 };
 544
 545 static void perf_session_free_sample_buffers(struct perf_session *session)
 546 {
 547         struct ordered_samples *os = &session->ordered_samples;
 548
 549         while (!list_empty(&os->to_free)) {
 550                 struct sample_queue *sq;
 551
 552                 sq = list_entry(os->to_free.next, struct sample_queue, list);
 553                 list_del(&sq->list);
 554                 free(sq);
 555         }
 556 }
 557
 558 static int perf_session_deliver_event(struct perf_session *session,
 559                                       union perf_event *event,
 560                                       struct perf_sample *sample,
 561                                       struct perf_tool *tool,
 562                                       u64 file_offset);
 563
 564 static void flush_sample_queue(struct perf_session *s,
 565                                struct perf_tool *tool)
 566 {
 567         struct ordered_samples *os = &s->ordered_samples;
 568         struct list_head *head = &os->samples;
 569         struct sample_queue *tmp, *iter;
 570         struct perf_sample sample;
 571         u64 limit = os->next_flush;
 572         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 573         unsigned idx = 0, progress_next = os->nr_samples / 16;
 574         int ret;
 575
 576         if (!tool->ordered_samples || !limit)
 577                 return;
 578
 579         list_for_each_entry_safe(iter, tmp, head, list) {
 580                 if (iter->timestamp > limit)
 581                         break;
 582
 583                 ret = perf_session__parse_sample(s, iter->event, &sample);
 584                 if (ret)
 585                         pr_err("Can't parse sample, err = %d\n", ret);
 586                 else
 587                         perf_session_deliver_event(s, iter->event, &sample, tool,
 588                                                    iter->file_offset);
 589
 590                 os->last_flush = iter->timestamp;
 591                 list_del(&iter->list);
 592                 list_add(&iter->list, &os->sample_cache);
 593                 if (++idx >= progress_next) {
 594                         progress_next += os->nr_samples / 16;
 595                         ui_progress__update(idx, os->nr_samples,
 596                                             "Processing time ordered events...");
 597                 }
 598         }
 599
 600         if (list_empty(head)) {
 601                 os->last_sample = NULL;
 602         } else if (last_ts <= limit) {
 603                 os->last_sample =
 604                         list_entry(head->prev, struct sample_queue, list);
 605         }
 606
 607         os->nr_samples = 0;
 608 }
 609
 610 /*
 611  * When perf record finishes a pass on every buffers, it records this pseudo
 612  * event.
 613  * We record the max timestamp t found in the pass n.
 614  * Assuming these timestamps are monotonic across cpus, we know that if
 615  * a buffer still has events with timestamps below t, they will be all
 616  * available and then read in the pass n + 1.
 617  * Hence when we start to read the pass n + 2, we can safely flush every
 618  * events with timestamps below t.
 619  *
 620  *    ============ PASS n =================
 621  *       CPU 0         |   CPU 1
 622  *                     |
 623  *    cnt1 timestamps  |   cnt2 timestamps
 624  *          1          |         2
 625  *          2          |         3
 626  *          -          |         4  <--- max recorded
 627  *
 628  *    ============ PASS n + 1 ==============
 629  *       CPU 0         |   CPU 1
 630  *                     |
 631  *    cnt1 timestamps  |   cnt2 timestamps
 632  *          3          |         5
 633  *          4          |         6
 634  *          5          |         7 <---- max recorded
 635  *
 636  *      Flush every events below timestamp 4
 637  *
 638  *    ============ PASS n + 2 ==============
 639  *       CPU 0         |   CPU 1
 640  *                     |
 641  *    cnt1 timestamps  |   cnt2 timestamps
 642  *          6          |         8
 643  *          7          |         9
 644  *          -          |         10
 645  *
 646  *      Flush every events below timestamp 7
 647  *      etc...
 648  */
 649 static int process_finished_round(struct perf_tool *tool,
 650                                   union perf_event *event __used,
 651                                   struct perf_session *session)
 652 {
 653         flush_sample_queue(session, tool);
 654         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 655
 656         return 0;
 657 }
 658
 659 /* The queue is ordered by time */
 660 static void __queue_event(struct sample_queue *new, struct perf_session *s)
 661 {
 662         struct ordered_samples *os = &s->ordered_samples;
 663         struct sample_queue *sample = os->last_sample;
 664         u64 timestamp = new->timestamp;
 665         struct list_head *p;
 666
 667         ++os->nr_samples;
 668         os->last_sample = new;
 669
 670         if (!sample) {
 671                 list_add(&new->list, &os->samples);
 672                 os->max_timestamp = timestamp;
 673                 return;
 674         }
 675
 676         /*
 677          * last_sample might point to some random place in the list as it's
 678          * the last queued event. We expect that the new event is close to
 679          * this.
 680          */
 681         if (sample->timestamp <= timestamp) {
 682                 while (sample->timestamp <= timestamp) {
 683                         p = sample->list.next;
 684                         if (p == &os->samples) {
 685                                 list_add_tail(&new->list, &os->samples);
 686                                 os->max_timestamp = timestamp;
 687                                 return;
 688                         }
 689                         sample = list_entry(p, struct sample_queue, list);
 690                 }
 691                 list_add_tail(&new->list, &sample->list);
 692         } else {
 693                 while (sample->timestamp > timestamp) {
 694                         p = sample->list.prev;
 695                         if (p == &os->samples) {
 696                                 list_add(&new->list, &os->samples);
 697                                 return;
 698                         }
 699                         sample = list_entry(p, struct sample_queue, list);
 700                 }
 701                 list_add(&new->list, &sample->list);
 702         }
 703 }
 704
 705 #define MAX_SAMPLE_BUFFER       (64 * 1024 / sizeof(struct sample_queue))
 706
 707 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
 708                                     struct perf_sample *sample, u64 file_offset)
 709 {
 710         struct ordered_samples *os = &s->ordered_samples;
 711         struct list_head *sc = &os->sample_cache;
 712         u64 timestamp = sample->time;
 713         struct sample_queue *new;
 714
 715         if (!timestamp || timestamp == ~0ULL)
 716                 return -ETIME;
 717
 718         if (timestamp < s->ordered_samples.last_flush) {
 719                 printf("Warning: Timestamp below last timeslice flush\n");
 720                 return -EINVAL;
 721         }
 722
 723         if (!list_empty(sc)) {
 724                 new = list_entry(sc->next, struct sample_queue, list);
 725                 list_del(&new->list);
 726         } else if (os->sample_buffer) {
 727                 new = os->sample_buffer + os->sample_buffer_idx;
 728                 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
 729                         os->sample_buffer = NULL;
 730         } else {
 731                 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
 732                 if (!os->sample_buffer)
 733                         return -ENOMEM;
 734                 list_add(&os->sample_buffer->list, &os->to_free);
 735                 os->sample_buffer_idx = 2;
 736                 new = os->sample_buffer + 1;
 737         }
 738
 739         new->timestamp = timestamp;
 740         new->file_offset = file_offset;
 741         new->event = event;
 742
 743         __queue_event(new, s);
 744
 745         return 0;
 746 }
 747
 748 static void callchain__printf(struct perf_sample *sample)
 749 {
 750         unsigned int i;
 751
 752         printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
 753
 754         for (i = 0; i < sample->callchain->nr; i++)
 755                 printf("..... %2d: %016" PRIx64 "\n",
 756                        i, sample->callchain->ips[i]);
 757 }
 758
 759 static void branch_stack__printf(struct perf_sample *sample)
 760 {
 761         uint64_t i;
 762
 763         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
 764
 765         for (i = 0; i < sample->branch_stack->nr; i++)
 766                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
 767                         i, sample->branch_stack->entries[i].from,
 768                         sample->branch_stack->entries[i].to);
 769 }
 770
 771 static void perf_session__print_tstamp(struct perf_session *session,
 772                                        union perf_event *event,
 773                                        struct perf_sample *sample)
 774 {
 775         if (event->header.type != PERF_RECORD_SAMPLE &&
 776             !session->sample_id_all) {
 777                 fputs("-1 -1 ", stdout);
 778                 return;
 779         }
 780
 781         if ((session->sample_type & PERF_SAMPLE_CPU))
 782                 printf("%u ", sample->cpu);
 783
 784         if (session->sample_type & PERF_SAMPLE_TIME)
 785                 printf("%" PRIu64 " ", sample->time);
 786 }
 787
 788 static void dump_event(struct perf_session *session, union perf_event *event,
 789                        u64 file_offset, struct perf_sample *sample)
 790 {
 791         if (!dump_trace)
 792                 return;
 793
 794         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 795                file_offset, event->header.size, event->header.type);
 796
 797         trace_event(event);
 798
 799         if (sample)
 800                 perf_session__print_tstamp(session, event, sample);
 801
 802         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 803                event->header.size, perf_event__name(event->header.type));
 804 }
 805
 806 static void dump_sample(struct perf_session *session, union perf_event *event,
 807                         struct perf_sample *sample)
 808 {
 809         if (!dump_trace)
 810                 return;
 811
 812         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 813                event->header.misc, sample->pid, sample->tid, sample->ip,
 814                sample->period, sample->addr);
 815
 816         if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
 817                 callchain__printf(sample);
 818
 819         if (session->sample_type & PERF_SAMPLE_BRANCH_STACK)
 820                 branch_stack__printf(sample);
 821 }
 822
 823 static struct machine *
 824         perf_session__find_machine_for_cpumode(struct perf_session *session,
 825                                                union perf_event *event)
 826 {
 827         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 828
 829         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest)
 830                 return perf_session__find_machine(session, event->ip.pid);
 831
 832         return perf_session__find_host_machine(session);
 833 }
 834
 835 static int perf_session_deliver_event(struct perf_session *session,
 836                                       union perf_event *event,
 837                                       struct perf_sample *sample,
 838                                       struct perf_tool *tool,
 839                                       u64 file_offset)
 840 {
 841         struct perf_evsel *evsel;
 842         struct machine *machine;
 843
 844         dump_event(session, event, file_offset, sample);
 845
 846         evsel = perf_evlist__id2evsel(session->evlist, sample->id);
 847         if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
 848                 /*
 849                  * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
 850                  * because the tools right now may apply filters, discarding
 851                  * some of the samples. For consistency, in the future we
 852                  * should have something like nr_filtered_samples and remove
 853                  * the sample->period from total_sample_period, etc, KISS for
 854                  * now tho.
 855                  *
 856                  * Also testing against NULL allows us to handle files without
 857                  * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
 858                  * future probably it'll be a good idea to restrict event
 859                  * processing via perf_session to files with both set.
 860                  */
 861                 hists__inc_nr_events(&evsel->hists, event->header.type);
 862         }
 863
 864         machine = perf_session__find_machine_for_cpumode(session, event);
 865
 866         switch (event->header.type) {
 867         case PERF_RECORD_SAMPLE:
 868                 dump_sample(session, event, sample);
 869                 if (evsel == NULL) {
 870                         ++session->hists.stats.nr_unknown_id;
 871                         return -1;
 872                 }
 873                 if (machine == NULL) {
 874                         ++session->hists.stats.nr_unprocessable_samples;
 875                         return -1;
 876                 }
 877                 return tool->sample(tool, event, sample, evsel, machine);
 878         case PERF_RECORD_MMAP:
 879                 return tool->mmap(tool, event, sample, machine);
 880         case PERF_RECORD_COMM:
 881                 return tool->comm(tool, event, sample, machine);
 882         case PERF_RECORD_FORK:
 883                 return tool->fork(tool, event, sample, machine);
 884         case PERF_RECORD_EXIT:
 885                 return tool->exit(tool, event, sample, machine);
 886         case PERF_RECORD_LOST:
 887                 if (tool->lost == perf_event__process_lost)
 888                         session->hists.stats.total_lost += event->lost.lost;
 889                 return tool->lost(tool, event, sample, machine);
 890         case PERF_RECORD_READ:
 891                 return tool->read(tool, event, sample, evsel, machine);
 892         case PERF_RECORD_THROTTLE:
 893                 return tool->throttle(tool, event, sample, machine);
 894         case PERF_RECORD_UNTHROTTLE:
 895                 return tool->unthrottle(tool, event, sample, machine);
 896         default:
 897                 ++session->hists.stats.nr_unknown_events;
 898                 return -1;
 899         }
 900 }
 901
 902 static int perf_session__preprocess_sample(struct perf_session *session,
 903                                            union perf_event *event, struct perf_sample *sample)
 904 {
 905         if (event->header.type != PERF_RECORD_SAMPLE ||
 906             !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
 907                 return 0;
 908
 909         if (!ip_callchain__valid(sample->callchain, event)) {
 910                 pr_debug("call-chain problem with event, skipping it.\n");
 911                 ++session->hists.stats.nr_invalid_chains;
 912                 session->hists.stats.total_invalid_chains += sample->period;
 913                 return -EINVAL;
 914         }
 915         return 0;
 916 }
 917
 918 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
 919                                             struct perf_tool *tool, u64 file_offset)
 920 {
 921         int err;
 922
 923         dump_event(session, event, file_offset, NULL);
 924
 925         /* These events are processed right away */
 926         switch (event->header.type) {
 927         case PERF_RECORD_HEADER_ATTR:
 928                 err = tool->attr(event, &session->evlist);
 929                 if (err == 0)
 930                         perf_session__update_sample_type(session);
 931                 return err;
 932         case PERF_RECORD_HEADER_EVENT_TYPE:
 933                 return tool->event_type(tool, event);
 934         case PERF_RECORD_HEADER_TRACING_DATA:
 935                 /* setup for reading amidst mmap */
 936                 lseek(session->fd, file_offset, SEEK_SET);
 937                 return tool->tracing_data(event, session);
 938         case PERF_RECORD_HEADER_BUILD_ID:
 939                 return tool->build_id(tool, event, session);
 940         case PERF_RECORD_FINISHED_ROUND:
 941                 return tool->finished_round(tool, event, session);
 942         default:
 943                 return -EINVAL;
 944         }
 945 }
 946
 947 static int perf_session__process_event(struct perf_session *session,
 948                                        union perf_event *event,
 949                                        struct perf_tool *tool,
 950                                        u64 file_offset)
 951 {
 952         struct perf_sample sample;
 953         int ret;
 954
 955         if (session->header.needs_swap &&
 956             perf_event__swap_ops[event->header.type])
 957                 perf_event__swap_ops[event->header.type](event);
 958
 959         if (event->header.type >= PERF_RECORD_HEADER_MAX)
 960                 return -EINVAL;
 961
 962         hists__inc_nr_events(&session->hists, event->header.type);
 963
 964         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
 965                 return perf_session__process_user_event(session, event, tool, file_offset);
 966
 967         /*
 968          * For all kernel events we get the sample data
 969          */
 970         ret = perf_session__parse_sample(session, event, &sample);
 971         if (ret)
 972                 return ret;
 973
 974         /* Preprocess sample records - precheck callchains */
 975         if (perf_session__preprocess_sample(session, event, &sample))
 976                 return 0;
 977
 978         if (tool->ordered_samples) {
 979                 ret = perf_session_queue_event(session, event, &sample,
 980                                                file_offset);
 981                 if (ret != -ETIME)
 982                         return ret;
 983         }
 984
 985         return perf_session_deliver_event(session, event, &sample, tool,
 986                                           file_offset);
 987 }
 988
 989 void perf_event_header__bswap(struct perf_event_header *self)
 990 {
 991         self->type = bswap_32(self->type);
 992         self->misc = bswap_16(self->misc);
 993         self->size = bswap_16(self->size);
 994 }
 995
 996 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
 997 {
 998         return machine__findnew_thread(&session->host_machine, pid);
 999 }
1000
1001 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
1002 {
1003         struct thread *thread = perf_session__findnew(self, 0);
1004
1005         if (thread == NULL || thread__set_comm(thread, "swapper")) {
1006                 pr_err("problem inserting idle task.\n");
1007                 thread = NULL;
1008         }
1009
1010         return thread;
1011 }
1012
1013 static void perf_session__warn_about_errors(const struct perf_session *session,
1014                                             const struct perf_tool *tool)
1015 {
1016         if (tool->lost == perf_event__process_lost &&
1017             session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) {
1018                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1019                             "Check IO/CPU overload!\n\n",
1020                             session->hists.stats.nr_events[0],
1021                             session->hists.stats.nr_events[PERF_RECORD_LOST]);
1022         }
1023
1024         if (session->hists.stats.nr_unknown_events != 0) {
1025                 ui__warning("Found %u unknown events!\n\n"
1026                             "Is this an older tool processing a perf.data "
1027                             "file generated by a more recent tool?\n\n"
1028                             "If that is not the case, consider "
1029                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1030                             session->hists.stats.nr_unknown_events);
1031         }
1032
1033         if (session->hists.stats.nr_unknown_id != 0) {
1034                 ui__warning("%u samples with id not present in the header\n",
1035                             session->hists.stats.nr_unknown_id);
1036         }
1037
1038         if (session->hists.stats.nr_invalid_chains != 0) {
1039                 ui__warning("Found invalid callchains!\n\n"
1040                             "%u out of %u events were discarded for this reason.\n\n"
1041                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1042                             session->hists.stats.nr_invalid_chains,
1043                             session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
1044         }
1045
1046         if (session->hists.stats.nr_unprocessable_samples != 0) {
1047                 ui__warning("%u unprocessable samples recorded.\n"
1048                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1049                             session->hists.stats.nr_unprocessable_samples);
1050         }
1051 }
1052
1053 #define session_done()  (*(volatile int *)(&session_done))
1054 volatile int session_done;
1055
1056 static int __perf_session__process_pipe_events(struct perf_session *self,
1057                                                struct perf_tool *tool)
1058 {
1059         union perf_event event;
1060         uint32_t size;
1061         int skip = 0;
1062         u64 head;
1063         int err;
1064         void *p;
1065
1066         perf_tool__fill_defaults(tool);
1067
1068         head = 0;
1069 more:
1070         err = readn(self->fd, &event, sizeof(struct perf_event_header));
1071         if (err <= 0) {
1072                 if (err == 0)
1073                         goto done;
1074
1075                 pr_err("failed to read event header\n");
1076                 goto out_err;
1077         }
1078
1079         if (self->header.needs_swap)
1080                 perf_event_header__bswap(&event.header);
1081
1082         size = event.header.size;
1083         if (size == 0)
1084                 size = 8;
1085
1086         p = &event;
1087         p += sizeof(struct perf_event_header);
1088
1089         if (size - sizeof(struct perf_event_header)) {
1090                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1091                 if (err <= 0) {
1092                         if (err == 0) {
1093                                 pr_err("unexpected end of event stream\n");
1094                                 goto done;
1095                         }
1096
1097                         pr_err("failed to read event data\n");
1098                         goto out_err;
1099                 }
1100         }
1101
1102         if ((skip = perf_session__process_event(self, &event, tool, head)) < 0) {
1103                 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1104                             head, event.header.size, event.header.type);
1105                 /*
1106                  * assume we lost track of the stream, check alignment, and
1107                  * increment a single u64 in the hope to catch on again 'soon'.
1108                  */
1109                 if (unlikely(head & 7))
1110                         head &= ~7ULL;
1111
1112                 size = 8;
1113         }
1114
1115         head += size;
1116
1117         if (skip > 0)
1118                 head += skip;
1119
1120         if (!session_done())
1121                 goto more;
1122 done:
1123         err = 0;
1124 out_err:
1125         perf_session__warn_about_errors(self, tool);
1126         perf_session_free_sample_buffers(self);
1127         return err;
1128 }
1129
1130 static union perf_event *
1131 fetch_mmaped_event(struct perf_session *session,
1132                    u64 head, size_t mmap_size, char *buf)
1133 {
1134         union perf_event *event;
1135
1136         /*
1137          * Ensure we have enough space remaining to read
1138          * the size of the event in the headers.
1139          */
1140         if (head + sizeof(event->header) > mmap_size)
1141                 return NULL;
1142
1143         event = (union perf_event *)(buf + head);
1144
1145         if (session->header.needs_swap)
1146                 perf_event_header__bswap(&event->header);
1147
1148         if (head + event->header.size > mmap_size)
1149                 return NULL;
1150
1151         return event;
1152 }
1153
1154 int __perf_session__process_events(struct perf_session *session,
1155                                    u64 data_offset, u64 data_size,
1156                                    u64 file_size, struct perf_tool *tool)
1157 {
1158         u64 head, page_offset, file_offset, file_pos, progress_next;
1159         int err, mmap_prot, mmap_flags, map_idx = 0;
1160         size_t  page_size, mmap_size;
1161         char *buf, *mmaps[8];
1162         union perf_event *event;
1163         uint32_t size;
1164
1165         perf_tool__fill_defaults(tool);
1166
1167         page_size = sysconf(_SC_PAGESIZE);
1168
1169         page_offset = page_size * (data_offset / page_size);
1170         file_offset = page_offset;
1171         head = data_offset - page_offset;
1172
1173         if (data_offset + data_size < file_size)
1174                 file_size = data_offset + data_size;
1175
1176         progress_next = file_size / 16;
1177
1178         mmap_size = session->mmap_window;
1179         if (mmap_size > file_size)
1180                 mmap_size = file_size;
1181
1182         memset(mmaps, 0, sizeof(mmaps));
1183
1184         mmap_prot  = PROT_READ;
1185         mmap_flags = MAP_SHARED;
1186
1187         if (session->header.needs_swap) {
1188                 mmap_prot  |= PROT_WRITE;
1189                 mmap_flags = MAP_PRIVATE;
1190         }
1191 remap:
1192         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1193                    file_offset);
1194         if (buf == MAP_FAILED) {
1195                 pr_err("failed to mmap file\n");
1196                 err = -errno;
1197                 goto out_err;
1198         }
1199         mmaps[map_idx] = buf;
1200         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1201         file_pos = file_offset + head;
1202
1203 more:
1204         event = fetch_mmaped_event(session, head, mmap_size, buf);
1205         if (!event) {
1206                 if (mmaps[map_idx]) {
1207                         munmap(mmaps[map_idx], mmap_size);
1208                         mmaps[map_idx] = NULL;
1209                 }
1210
1211                 page_offset = page_size * (head / page_size);
1212                 file_offset += page_offset;
1213                 head -= page_offset;
1214                 goto remap;
1215         }
1216
1217         size = event->header.size;
1218
1219         if (size == 0 ||
1220             perf_session__process_event(session, event, tool, file_pos) < 0) {
1221                 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1222                             file_offset + head, event->header.size,
1223                             event->header.type);
1224                 /*
1225                  * assume we lost track of the stream, check alignment, and
1226                  * increment a single u64 in the hope to catch on again 'soon'.
1227                  */
1228                 if (unlikely(head & 7))
1229                         head &= ~7ULL;
1230
1231                 size = 8;
1232         }
1233
1234         head += size;
1235         file_pos += size;
1236
1237         if (file_pos >= progress_next) {
1238                 progress_next += file_size / 16;
1239                 ui_progress__update(file_pos, file_size,
1240                                     "Processing events...");
1241         }
1242
1243         if (file_pos < file_size)
1244                 goto more;
1245
1246         err = 0;
1247         /* do the final flush for ordered samples */
1248         session->ordered_samples.next_flush = ULLONG_MAX;
1249         flush_sample_queue(session, tool);
1250 out_err:
1251         perf_session__warn_about_errors(session, tool);
1252         perf_session_free_sample_buffers(session);
1253         return err;
1254 }
1255
1256 int perf_session__process_events(struct perf_session *self,
1257                                  struct perf_tool *tool)
1258 {
1259         int err;
1260
1261         if (perf_session__register_idle_thread(self) == NULL)
1262                 return -ENOMEM;
1263
1264         if (!self->fd_pipe)
1265                 err = __perf_session__process_events(self,
1266                                                      self->header.data_offset,
1267                                                      self->header.data_size,
1268                                                      self->size, tool);
1269         else
1270                 err = __perf_session__process_pipe_events(self, tool);
1271
1272         return err;
1273 }
1274
1275 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1276 {
1277         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1278                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1279                 return false;
1280         }
1281
1282         return true;
1283 }
1284
1285 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1286                                      const char *symbol_name, u64 addr)
1287 {
1288         char *bracket;
1289         enum map_type i;
1290         struct ref_reloc_sym *ref;
1291
1292         ref = zalloc(sizeof(struct ref_reloc_sym));
1293         if (ref == NULL)
1294                 return -ENOMEM;
1295
1296         ref->name = strdup(symbol_name);
1297         if (ref->name == NULL) {
1298                 free(ref);
1299                 return -ENOMEM;
1300         }
1301
1302         bracket = strchr(ref->name, ']');
1303         if (bracket)
1304                 *bracket = '\0';
1305
1306         ref->addr = addr;
1307
1308         for (i = 0; i < MAP__NR_TYPES; ++i) {
1309                 struct kmap *kmap = map__kmap(maps[i]);
1310                 kmap->ref_reloc_sym = ref;
1311         }
1312
1313         return 0;
1314 }
1315
1316 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1317 {
1318         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1319                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1320                machines__fprintf_dsos(&self->machines, fp);
1321 }
1322
1323 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1324                                           bool with_hits)
1325 {
1326         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1327         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1328 }
1329
1330 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1331 {
1332         struct perf_evsel *pos;
1333         size_t ret = fprintf(fp, "Aggregated stats:\n");
1334
1335         ret += hists__fprintf_nr_events(&session->hists, fp);
1336
1337         list_for_each_entry(pos, &session->evlist->entries, node) {
1338                 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1339                 ret += hists__fprintf_nr_events(&pos->hists, fp);
1340         }
1341
1342         return ret;
1343 }
1344
1345 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1346 {
1347         /*
1348          * FIXME: Here we have to actually print all the machines in this
1349          * session, not just the host...
1350          */
1351         return machine__fprintf(&session->host_machine, fp);
1352 }
1353
1354 void perf_session__remove_thread(struct perf_session *session,
1355                                  struct thread *th)
1356 {
1357         /*
1358          * FIXME: This one makes no sense, we need to remove the thread from
1359          * the machine it belongs to, perf_session can have many machines, so
1360          * doing it always on ->host_machine is wrong.  Fix when auditing all
1361          * the 'perf kvm' code.
1362          */
1363         machine__remove_thread(&session->host_machine, th);
1364 }
1365
1366 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1367                                               unsigned int type)
1368 {
1369         struct perf_evsel *pos;
1370
1371         list_for_each_entry(pos, &session->evlist->entries, node) {
1372                 if (pos->attr.type == type)
1373                         return pos;
1374         }
1375         return NULL;
1376 }
1377
1378 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
1379                           struct machine *machine, struct perf_evsel *evsel,
1380                           int print_sym, int print_dso, int print_symoffset)
1381 {
1382         struct addr_location al;
1383         struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
1384         struct callchain_cursor_node *node;
1385
1386         if (perf_event__preprocess_sample(event, machine, &al, sample,
1387                                           NULL) < 0) {
1388                 error("problem processing %d event, skipping it.\n",
1389                         event->header.type);
1390                 return;
1391         }
1392
1393         if (symbol_conf.use_callchain && sample->callchain) {
1394
1395                 if (machine__resolve_callchain(machine, evsel, al.thread,
1396                                                 sample->callchain, NULL) != 0) {
1397                         if (verbose)
1398                                 error("Failed to resolve callchain. Skipping\n");
1399                         return;
1400                 }
1401                 callchain_cursor_commit(cursor);
1402
1403                 while (1) {
1404                         node = callchain_cursor_current(cursor);
1405                         if (!node)
1406                                 break;
1407
1408                         printf("\t%16" PRIx64, node->ip);
1409                         if (print_sym) {
1410                                 printf(" ");
1411                                 symbol__fprintf_symname(node->sym, stdout);
1412                         }
1413                         if (print_dso) {
1414                                 printf(" (");
1415                                 map__fprintf_dsoname(al.map, stdout);
1416                                 printf(")");
1417                         }
1418                         printf("\n");
1419
1420                         callchain_cursor_advance(cursor);
1421                 }
1422
1423         } else {
1424                 printf("%16" PRIx64, sample->ip);
1425                 if (print_sym) {
1426                         printf(" ");
1427                         if (print_symoffset)
1428                                 symbol__fprintf_symname_offs(al.sym, &al,
1429                                                              stdout);
1430                         else
1431                                 symbol__fprintf_symname(al.sym, stdout);
1432                 }
1433
1434                 if (print_dso) {
1435                         printf(" (");
1436                         map__fprintf_dsoname(al.map, stdout);
1437                         printf(")");
1438                 }
1439         }
1440 }
1441
1442 int perf_session__cpu_bitmap(struct perf_session *session,
1443                              const char *cpu_list, unsigned long *cpu_bitmap)
1444 {
1445         int i;
1446         struct cpu_map *map;
1447
1448         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1449                 struct perf_evsel *evsel;
1450
1451                 evsel = perf_session__find_first_evtype(session, i);
1452                 if (!evsel)
1453                         continue;
1454
1455                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1456                         pr_err("File does not contain CPU events. "
1457                                "Remove -c option to proceed.\n");
1458                         return -1;
1459                 }
1460         }
1461
1462         map = cpu_map__new(cpu_list);
1463         if (map == NULL) {
1464                 pr_err("Invalid cpu_list\n");
1465                 return -1;
1466         }
1467
1468         for (i = 0; i < map->nr; i++) {
1469                 int cpu = map->map[i];
1470
1471                 if (cpu >= MAX_NR_CPUS) {
1472                         pr_err("Requested CPU %d too large. "
1473                                "Consider raising MAX_NR_CPUS\n", cpu);
1474                         return -1;
1475                 }
1476
1477                 set_bit(cpu, cpu_bitmap);
1478         }
1479
1480         return 0;
1481 }
1482
1483 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1484                                 bool full)
1485 {
1486         struct stat st;
1487         int ret;
1488
1489         if (session == NULL || fp == NULL)
1490                 return;
1491
1492         ret = fstat(session->fd, &st);
1493         if (ret == -1)
1494                 return;
1495
1496         fprintf(fp, "# ========\n");
1497         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1498         perf_header__fprintf_info(session, fp, full);
1499         fprintf(fp, "# ========\n#\n");
1500 }