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