summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/session.c
blob: 080e5336d89f54c6011553d027c12d598af0afb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
#define _FILE_OFFSET_BITS 64

#include <linux/kernel.h>

#include <byteswap.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>

#include "evlist.h"
#include "evsel.h"
#include "session.h"
#include "sort.h"
#include "util.h"
#include "cpumap.h"

static int perf_session__open(struct perf_session *self, bool force)
{
	struct stat input_stat;

	if (!strcmp(self->filename, "-")) {
		self->fd_pipe = true;
		self->fd = STDIN_FILENO;

		if (perf_session__read_header(self, self->fd) < 0)
			pr_err("incompatible file format");

		return 0;
	}

	self->fd = open(self->filename, O_RDONLY);
	if (self->fd < 0) {
		int err = errno;

		pr_err("failed to open %s: %s", self->filename, strerror(err));
		if (err == ENOENT && !strcmp(self->filename, "perf.data"))
			pr_err("  (try 'perf record' first)");
		pr_err("\n");
		return -errno;
	}

	if (fstat(self->fd, &input_stat) < 0)
		goto out_close;

	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
		pr_err("file %s not owned by current user or root\n",
		       self->filename);
		goto out_close;
	}

	if (!input_stat.st_size) {
		pr_info("zero-sized file (%s), nothing to do!\n",
			self->filename);
		goto out_close;
	}

	if (perf_session__read_header(self, self->fd) < 0) {
		pr_err("incompatible file format");
		goto out_close;
	}

	if (!perf_evlist__valid_sample_type(self->evlist)) {
		pr_err("non matching sample_type");
		goto out_close;
	}

	if (!perf_evlist__valid_sample_id_all(self->evlist)) {
		pr_err("non matching sample_id_all");
		goto out_close;
	}

	self->size = input_stat.st_size;
	return 0;

out_close:
	close(self->fd);
	self->fd = -1;
	return -1;
}

static void perf_session__id_header_size(struct perf_session *session)
{
       struct perf_sample *data;
       u64 sample_type = session->sample_type;
       u16 size = 0;

	if (!session->sample_id_all)
		goto out;

       if (sample_type & PERF_SAMPLE_TID)
               size += sizeof(data->tid) * 2;

       if (sample_type & PERF_SAMPLE_TIME)
               size += sizeof(data->time);

       if (sample_type & PERF_SAMPLE_ID)
               size += sizeof(data->id);

       if (sample_type & PERF_SAMPLE_STREAM_ID)
               size += sizeof(data->stream_id);

       if (sample_type & PERF_SAMPLE_CPU)
               size += sizeof(data->cpu) * 2;
out:
       session->id_hdr_size = size;
}

void perf_session__update_sample_type(struct perf_session *self)
{
	self->sample_type = perf_evlist__sample_type(self->evlist);
	self->sample_size = __perf_evsel__sample_size(self->sample_type);
	self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
	perf_session__id_header_size(self);
}

int perf_session__create_kernel_maps(struct perf_session *self)
{
	int ret = machine__create_kernel_maps(&self->host_machine);

	if (ret >= 0)
		ret = machines__create_guest_kernel_maps(&self->machines);
	return ret;
}

static void perf_session__destroy_kernel_maps(struct perf_session *self)
{
	machine__destroy_kernel_maps(&self->host_machine);
	machines__destroy_guest_kernel_maps(&self->machines);
}

struct perf_session *perf_session__new(const char *filename, int mode,
				       bool force, bool repipe,
				       struct perf_event_ops *ops)
{
	size_t len = filename ? strlen(filename) + 1 : 0;
	struct perf_session *self = zalloc(sizeof(*self) + len);

	if (self == NULL)
		goto out;

	memcpy(self->filename, filename, len);
	self->threads = RB_ROOT;
	INIT_LIST_HEAD(&self->dead_threads);
	self->last_match = NULL;
	/*
	 * On 64bit we can mmap the data file in one go. No need for tiny mmap
	 * slices. On 32bit we use 32MB.
	 */
#if BITS_PER_LONG == 64
	self->mmap_window = ULLONG_MAX;
#else
	self->mmap_window = 32 * 1024 * 1024ULL;
#endif
	self->machines = RB_ROOT;
	self->repipe = repipe;
	INIT_LIST_HEAD(&self->ordered_samples.samples);
	INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
	INIT_LIST_HEAD(&self->ordered_samples.to_free);
	machine__init(&self->host_machine, "", HOST_KERNEL_ID);

	if (mode == O_RDONLY) {
		if (perf_session__open(self, force) < 0)
			goto out_delete;
		perf_session__update_sample_type(self);
	} else if (mode == O_WRONLY) {
		/*
		 * In O_RDONLY mode this will be performed when reading the
		 * kernel MMAP event, in perf_event__process_mmap().
		 */
		if (perf_session__create_kernel_maps(self) < 0)
			goto out_delete;
	}

	if (ops && ops->ordering_requires_timestamps &&
	    ops->ordered_samples && !self->sample_id_all) {
		dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
		ops->ordered_samples = false;
	}

out:
	return self;
out_delete:
	perf_session__delete(self);
	return NULL;
}

static void perf_session__delete_dead_threads(struct perf_session *self)
{
	struct thread *n, *t;

	list_for_each_entry_safe(t, n, &self->dead_threads, node) {
		list_del(&t->node);
		thread__delete(t);
	}
}

static void perf_session__delete_threads(struct perf_session *self)
{
	struct rb_node *nd = rb_first(&self->threads);

	while (nd) {
		struct thread *t = rb_entry(nd, struct thread, rb_node);

		rb_erase(&t->rb_node, &self->threads);
		nd = rb_next(nd);
		thread__delete(t);
	}
}

void perf_session__delete(struct perf_session *self)
{
	perf_session__destroy_kernel_maps(self);
	perf_session__delete_dead_threads(self);
	perf_session__delete_threads(self);
	machine__exit(&self->host_machine);
	close(self->fd);
	free(self);
}

void perf_session__remove_thread(struct perf_session *self, struct thread *th)
{
	self->last_match = NULL;
	rb_erase(&th->rb_node, &self->threads);
	/*
	 * We may have references to this thread, for instance in some hist_entry
	 * instances, so just move them to a separate list.
	 */
	list_add_tail(&th->node, &self->dead_threads);
}

static bool symbol__match_parent_regex(struct symbol *sym)
{
	if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
		return 1;

	return 0;
}

int perf_session__resolve_callchain(struct perf_session *self,
				    struct thread *thread,
				    struct ip_callchain *chain,
				    struct symbol **parent)
{
	u8 cpumode = PERF_RECORD_MISC_USER;
	unsigned int i;
	int err;

	callchain_cursor_reset(&self->callchain_cursor);

	for (i = 0; i < chain->nr; i++) {
		u64 ip;
		struct addr_location al;

		if (callchain_param.order == ORDER_CALLEE)
			ip = chain->ips[i];
		else
			ip = chain->ips[chain->nr - i - 1];

		if (ip >= PERF_CONTEXT_MAX) {
			switch (ip) {
			case PERF_CONTEXT_HV:
				cpumode = PERF_RECORD_MISC_HYPERVISOR;	break;
			case PERF_CONTEXT_KERNEL:
				cpumode = PERF_RECORD_MISC_KERNEL;	break;
			case PERF_CONTEXT_USER:
				cpumode = PERF_RECORD_MISC_USER;	break;
			default:
				break;
			}
			continue;
		}

		al.filtered = false;
		thread__find_addr_location(thread, self, cpumode,
				MAP__FUNCTION, thread->pid, ip, &al, NULL);
		if (al.sym != NULL) {
			if (sort__has_parent && !*parent &&
			    symbol__match_parent_regex(al.sym))
				*parent = al.sym;
			if (!symbol_conf.use_callchain)
				break;
		}

		err = callchain_cursor_append(&self->callchain_cursor,
					      ip, al.map, al.sym);
		if (err)
			return err;
	}

	return 0;
}

static int process_event_synth_stub(union perf_event *event __used,
				    struct perf_session *session __used)
{
	dump_printf(": unhandled!\n");
	return 0;
}

static int process_event_sample_stub(union perf_event *event __used,
				     struct perf_sample *sample __used,
				     struct perf_evsel *evsel __used,
				     struct perf_session *session __used)
{
	dump_printf(": unhandled!\n");
	return 0;
}

static int process_event_stub(union perf_event *event __used,
			      struct perf_sample *sample __used,
			      struct perf_session *session __used)
{
	dump_printf(": unhandled!\n");
	return 0;
}

static int process_finished_round_stub(union perf_event *event __used,
				       struct perf_session *session __used,
				       struct perf_event_ops *ops __used)
{
	dump_printf(": unhandled!\n");
	return 0;
}

static int process_finished_round(union perf_event *event,
				  struct perf_session *session,
				  struct perf_event_ops *ops);

static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
{
	if (handler->sample == NULL)
		handler->sample = process_event_sample_stub;
	if (handler->mmap == NULL)
		handler->mmap = process_event_stub;
	if (handler->comm == NULL)
		handler->comm = process_event_stub;
	if (handler->fork == NULL)
		handler->fork = process_event_stub;
	if (handler->exit == NULL)
		handler->exit = process_event_stub;
	if (handler->lost == NULL)
		handler->lost = perf_event__process_lost;
	if (handler->read == NULL)
		handler->read = process_event_stub;
	if (handler->throttle == NULL)
		handler->throttle = process_event_stub;
	if (handler->unthrottle == NULL)
		handler->unthrottle = process_event_stub;
	if (handler->attr == NULL)
		handler->attr = process_event_synth_stub;
	if (handler->event_type == NULL)
		handler->event_type = process_event_synth_stub;
	if (handler->tracing_data == NULL)
		handler->tracing_data = process_event_synth_stub;
	if (handler->build_id == NULL)
		handler->build_id = process_event_synth_stub;
	if (handler->finished_round == NULL) {
		if (handler->ordered_samples)
			handler->finished_round = process_finished_round;
		else
			handler->finished_round = process_finished_round_stub;
	}
}

void mem_bswap_64(void *src, int byte_size)
{
	u64 *m = src;

	while (byte_size > 0) {
		*m = bswap_64(*m);
		byte_size -= sizeof(u64);
		++m;
	}
}

static void perf_event__all64_swap(union perf_event *event)
{
	struct perf_event_header *hdr = &event->header;
	mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
}

static void perf_event__comm_swap(union perf_event *event)
{
	event->comm.pid = bswap_32(event->comm.pid);
	event->comm.tid = bswap_32(event->comm.tid);
}

static void perf_event__mmap_swap(union perf_event *event)
{
	event->mmap.pid	  = bswap_32(event->mmap.pid);
	event->mmap.tid	  = bswap_32(event->mmap.tid);
	event->mmap.start = bswap_64(event->mmap.start);
	event->mmap.len	  = bswap_64(event->mmap.len);
	event->mmap.pgoff = bswap_64(event->mmap.pgoff);
}

static void perf_event__task_swap(union perf_event *event)
{
	event->fork.pid	 = bswap_32(event->fork.pid);
	event->fork.tid	 = bswap_32(event->fork.tid);
	event->fork.ppid = bswap_32(event->fork.ppid);
	event->fork.ptid = bswap_32(event->fork.ptid);
	event->fork.time = bswap_64(event->fork.time);
}

static void perf_event__read_swap(union perf_event *event)
{
	event->read.pid		 = bswap_32(event->read.pid);
	event->read.tid		 = bswap_32(event->read.tid);
	event->read.value	 = bswap_64(event->read.value);
	event->read.time_enabled = bswap_64(event->read.time_enabled);
	event->read.time_running = bswap_64(event->read.time_running);
	event->read.id		 = bswap_64(event->read.id);
}

static void perf_event__attr_swap(union perf_event *event)
{
	size_t size;

	event->attr.attr.type		= bswap_32(event->attr.attr.type);
	event->attr.attr.size		= bswap_32(event->attr.attr.size);
	event->attr.attr.config		= bswap_64(event->attr.attr.config);
	event->attr.attr.sample_period	= bswap_64(event->attr.attr.sample_period);
	event->attr.attr.sample_type	= bswap_64(event->attr.attr.sample_type);
	event->attr.attr.read_format	= bswap_64(event->attr.attr.read_format);
	event->attr.attr.wakeup_events	= bswap_32(event->attr.attr.wakeup_events);
	event->attr.attr.bp_type	= bswap_32(event->attr.attr.bp_type);
	event->attr.attr.bp_addr	= bswap_64(event->attr.attr.bp_addr);
	event->attr.attr.bp_len		= bswap_64(event->attr.attr.bp_len);

	size = event->header.size;
	size -= (void *)&event->attr.id - (void *)event;
	mem_bswap_64(event->attr.id, size);
}

static void perf_event__event_type_swap(union perf_event *event)
{
	event->event_type.event_type.event_id =
		bswap_64(event->event_type.event_type.event_id);
}

static void perf_event__tracing_data_swap(union perf_event *event)
{
	event->tracing_data.size = bswap_32(event->tracing_data.size);
}

typedef void (*perf_event__swap_op)(union perf_event *event);

static perf_event__swap_op perf_event__swap_ops[] = {
	[PERF_RECORD_MMAP]		  = perf_event__mmap_swap,
	[PERF_RECORD_COMM]		  = perf_event__comm_swap,
	[PERF_RECORD_FORK]		  = perf_event__task_swap,
	[PERF_RECORD_EXIT]		  = perf_event__task_swap,
	[PERF_RECORD_LOST]		  = perf_event__all64_swap,
	[PERF_RECORD_READ]		  = perf_event__read_swap,
	[PERF_RECORD_SAMPLE]		  = perf_event__all64_swap,
	[PERF_RECORD_HEADER_ATTR]	  = perf_event__attr_swap,
	[PERF_RECORD_HEADER_EVENT_TYPE]	  = perf_event__event_type_swap,
	[PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
	[PERF_RECORD_HEADER_BUILD_ID]	  = NULL,
	[PERF_RECORD_HEADER_MAX]	  = NULL,
};

struct sample_queue {
	u64			timestamp;
	u64			file_offset;
	union perf_event	*event;
	struct list_head	list;
};

static void perf_session_free_sample_buffers(struct perf_session *session)
{
	struct ordered_samples *os = &session->ordered_samples;

	while (!list_empty(&os->to_free)) {
		struct sample_queue *sq;

		sq = list_entry(os->to_free.next, struct sample_queue, list);
		list_del(&sq->list);
		free(sq);
	}
}

static int perf_session_deliver_event(struct perf_session *session,
				      union perf_event *event,
				      struct perf_sample *sample,
				      struct perf_event_ops *ops,
				      u64 file_offset);

static void flush_sample_queue(struct perf_session *s,
			       struct perf_event_ops *ops)
{
	struct ordered_samples *os = &s->ordered_samples;
	struct list_head *head = &os->samples;
	struct sample_queue *tmp, *iter;
	struct perf_sample sample;
	u64 limit = os->next_flush;
	u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
	int ret;

	if (!ops->ordered_samples || !limit)
		return;

	list_for_each_entry_safe(iter, tmp, head, list) {
		if (iter->timestamp > limit)
			break;

		ret = perf_session__parse_sample(s, iter->event, &sample);
		if (ret)
			pr_err("Can't parse sample, err = %d\n", ret);
		else
			perf_session_deliver_event(s, iter->event, &sample, ops,
						   iter->file_offset);

		os->last_flush = iter->timestamp;
		list_del(&iter->list);
		list_add(&iter->list, &os->sample_cache);
	}

	if (list_empty(head)) {
		os->last_sample = NULL;
	} else if (last_ts <= limit) {
		os->last_sample =
			list_entry(head->prev, struct sample_queue, list);
	}
}

/*
 * When perf record finishes a pass on every buffers, it records this pseudo
 * event.
 * We record the max timestamp t found in the pass n.
 * Assuming these timestamps are monotonic across cpus, we know that if
 * a buffer still has events with timestamps below t, they will be all
 * available and then read in the pass n + 1.
 * Hence when we start to read the pass n + 2, we can safely flush every
 * events with timestamps below t.
 *
 *    ============ PASS n =================
 *       CPU 0         |   CPU 1
 *                     |
 *    cnt1 timestamps  |   cnt2 timestamps
 *          1          |         2
 *          2          |         3
 *          -          |         4  <--- max recorded
 *
 *    ============ PASS n + 1 ==============
 *       CPU 0         |   CPU 1
 *                     |
 *    cnt1 timestamps  |   cnt2 timestamps
 *          3          |         5
 *          4          |         6
 *          5          |         7 <---- max recorded
 *
 *      Flush every events below timestamp 4
 *
 *    ============ PASS n + 2 ==============
 *       CPU 0         |   CPU 1
 *                     |
 *    cnt1 timestamps  |   cnt2 timestamps
 *          6          |         8
 *          7          |         9
 *          -          |         10
 *
 *      Flush every events below timestamp 7
 *      etc...
 */
static int process_finished_round(union perf_event *event __used,
				  struct perf_session *session,
				  struct perf_event_ops *ops)
{
	flush_sample_queue(session, ops);
	session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;

	return 0;
}

/* The queue is ordered by time */
static void __queue_event(struct sample_queue *new, struct perf_session *s)
{
	struct ordered_samples *os = &s->ordered_samples;
	struct sample_queue *sample = os->last_sample;
	u64 timestamp = new->timestamp;
	struct list_head *p;

	os->last_sample = new;

	if (!sample) {
		list_add(&new->list, &os->samples);
		os->max_timestamp = timestamp;
		return;
	}

	/*
	 * last_sample might point to some random place in the list as it's
	 * the last queued event. We expect that the new event is close to
	 * this.
	 */
	if (sample->timestamp <= timestamp) {
		while (sample->timestamp <= timestamp) {
			p = sample->list.next;
			if (p == &os->samples) {
				list_add_tail(&new->list, &os->samples);
				os->max_timestamp = timestamp;
				return;
			}
			sample = list_entry(p, struct sample_queue, list);
		}
		list_add_tail(&new->list, &sample->list);
	} else {
		while (sample->timestamp > timestamp) {
			p = sample->list.prev;
			if (p == &os->samples) {
				list_add(&new->list, &os->samples);
				return;
			}
			sample = list_entry(p, struct sample_queue, list);
		}
		list_add(&new->list, &sample->list);
	}
}

#define MAX_SAMPLE_BUFFER	(64 * 1024 / sizeof(struct sample_queue))

static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
				    struct perf_sample *sample, u64 file_offset)
{
	struct ordered_samples *os = &s->ordered_samples;
	struct list_head *sc = &os->sample_cache;
	u64 timestamp = sample->time;
	struct sample_queue *new;

	if (!timestamp || timestamp == ~0ULL)
		return -ETIME;

	if (timestamp < s->ordered_samples.last_flush) {
		printf("Warning: Timestamp below last timeslice flush\n");
		return -EINVAL;
	}

	if (!list_empty(sc)) {
		new = list_entry(sc->next, struct sample_queue, list);
		list_del(&new->list);
	} else if (os->sample_buffer) {
		new = os->sample_buffer + os->sample_buffer_idx;
		if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
			os->sample_buffer = NULL;
	} else {
		os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
		if (!os->sample_buffer)
			return -ENOMEM;
		list_add(&os->sample_buffer->list, &os->to_free);
		os->sample_buffer_idx = 2;
		new = os->sample_buffer + 1;
	}

	new->timestamp = timestamp;
	new->file_offset = file_offset;
	new->event = event;

	__queue_event(new, s);

	return 0;
}

static void callchain__printf(struct perf_sample *sample)
{
	unsigned int i;

	printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);

	for (i = 0; i < sample->callchain->nr; i++)
		printf("..... %2d: %016" PRIx64 "\n",
		       i, sample->callchain->ips[i]);
}

static void perf_session__print_tstamp(struct perf_session *session,
				       union perf_event *event,
				       struct perf_sample *sample)
{
	if (event->header.type != PERF_RECORD_SAMPLE &&
	    !session->sample_id_all) {
		fputs("-1 -1 ", stdout);
		return;
	}

	if ((session->sample_type & PERF_SAMPLE_CPU))
		printf("%u ", sample->cpu);

	if (session->sample_type & PERF_SAMPLE_TIME)
		printf("%" PRIu64 " ", sample->time);
}

static void dump_event(struct perf_session *session, union perf_event *event,
		       u64 file_offset, struct perf_sample *sample)
{
	if (!dump_trace)
		return;

	printf("\n%#" PRIx64 " [%#x]: event: %d\n",
	       file_offset, event->header.size, event->header.type);

	trace_event(event);

	if (sample)
		perf_session__print_tstamp(session, event, sample);

	printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
	       event->header.size, perf_event__name(event->header.type));
}

static void dump_sample(struct perf_session *session, union perf_event *event,
			struct perf_sample *sample)
{
	if (!dump_trace)
		return;

	printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
	       event->header.misc, sample->pid, sample->tid, sample->ip,
	       sample->period, sample->addr);

	if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
		callchain__printf(sample);
}

static int perf_session_deliver_event(struct perf_session *session,
				      union perf_event *event,
				      struct perf_sample *sample,
				      struct perf_event_ops *ops,
				      u64 file_offset)
{
	struct perf_evsel *evsel;

	dump_event(session, event, file_offset, sample);

	switch (event->header.type) {
	case PERF_RECORD_SAMPLE:
		dump_sample(session, event, sample);
		evsel = perf_evlist__id2evsel(session->evlist, sample->id);
		if (evsel == NULL) {
			++session->hists.stats.nr_unknown_id;
			return -1;
		}
		return ops->sample(event, sample, evsel, session);
	case PERF_RECORD_MMAP:
		return ops->mmap(event, sample, session);
	case PERF_RECORD_COMM:
		return ops->comm(event, sample, session);
	case PERF_RECORD_FORK:
		return ops->fork(event, sample, session);
	case PERF_RECORD_EXIT:
		return ops->exit(event, sample, session);
	case PERF_RECORD_LOST:
		return ops->lost(event, sample, session);
	case PERF_RECORD_READ:
		return ops->read(event, sample, session);
	case PERF_RECORD_THROTTLE:
		return ops->throttle(event, sample, session);
	case PERF_RECORD_UNTHROTTLE:
		return ops->unthrottle(event, sample, session);
	default:
		++session->hists.stats.nr_unknown_events;
		return -1;
	}
}

static int perf_session__preprocess_sample(struct perf_session *session,
					   union perf_event *event, struct perf_sample *sample)
{
	if (event->header.type != PERF_RECORD_SAMPLE ||
	    !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
		return 0;

	if (!ip_callchain__valid(sample->callchain, event)) {
		pr_debug("call-chain problem with event, skipping it.\n");
		++session->hists.stats.nr_invalid_chains;
		session->hists.stats.total_invalid_chains += sample->period;
		return -EINVAL;
	}
	return 0;
}

static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
					    struct perf_event_ops *ops, u64 file_offset)
{
	dump_event(session, event, file_offset, NULL);

	/* These events are processed right away */
	switch (event->header.type) {
	case PERF_RECORD_HEADER_ATTR:
		return ops->attr(event, session);
	case PERF_RECORD_HEADER_EVENT_TYPE:
		return ops->event_type(event, session);
	case PERF_RECORD_HEADER_TRACING_DATA:
		/* setup for reading amidst mmap */
		lseek(session->fd, file_offset, SEEK_SET);
		return ops->tracing_data(event, session);
	case PERF_RECORD_HEADER_BUILD_ID:
		return ops->build_id(event, session);
	case PERF_RECORD_FINISHED_ROUND:
		return ops->finished_round(event, session, ops);
	default:
		return -EINVAL;
	}
}

static int perf_session__process_event(struct perf_session *session,
				       union perf_event *event,
				       struct perf_event_ops *ops,
				       u64 file_offset)
{
	struct perf_sample sample;
	int ret;

	if (session->header.needs_swap &&
	    perf_event__swap_ops[event->header.type])
		perf_event__swap_ops[event->header.type](event);

	if (event->header.type >= PERF_RECORD_HEADER_MAX)
		return -EINVAL;

	hists__inc_nr_events(&session->hists, event->header.type);

	if (event->header.type >= PERF_RECORD_USER_TYPE_START)
		return perf_session__process_user_event(session, event, ops, file_offset);

	/*
	 * For all kernel events we get the sample data
	 */
	ret = perf_session__parse_sample(session, event, &sample);
	if (ret)
		return ret;

	/* Preprocess sample records - precheck callchains */
	if (perf_session__preprocess_sample(session, event, &sample))
		return 0;

	if (ops->ordered_samples) {
		ret = perf_session_queue_event(session, event, &sample,
					       file_offset);
		if (ret != -ETIME)
			return ret;
	}

	return perf_session_deliver_event(session, event, &sample, ops,
					  file_offset);
}

void perf_event_header__bswap(struct perf_event_header *self)
{
	self->type = bswap_32(self->type);
	self->misc = bswap_16(self->misc);
	self->size = bswap_16(self->size);
}

static struct thread *perf_session__register_idle_thread(struct perf_session *self)
{
	struct thread *thread = perf_session__findnew(self, 0);

	if (thread == NULL || thread__set_comm(thread, "swapper")) {
		pr_err("problem inserting idle task.\n");
		thread = NULL;
	}

	return thread;
}

static void perf_session__warn_about_errors(const struct perf_session *session,
					    const struct perf_event_ops *ops)
{
	if (ops->lost == perf_event__process_lost &&
	    session->hists.stats.total_lost != 0) {
		ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
			    "!\n\nCheck IO/CPU overload!\n\n",
			    session->hists.stats.total_period,
			    session->hists.stats.total_lost);
	}

	if (session->hists.stats.nr_unknown_events != 0) {
		ui__warning("Found %u unknown events!\n\n"
			    "Is this an older tool processing a perf.data "
			    "file generated by a more recent tool?\n\n"
			    "If that is not the case, consider "
			    "reporting to linux-kernel@vger.kernel.org.\n\n",
			    session->hists.stats.nr_unknown_events);
	}

	if (session->hists.stats.nr_unknown_id != 0) {
		ui__warning("%u samples with id not present in the header\n",
			    session->hists.stats.nr_unknown_id);
	}

 	if (session->hists.stats.nr_invalid_chains != 0) {
 		ui__warning("Found invalid callchains!\n\n"
 			    "%u out of %u events were discarded for this reason.\n\n"
 			    "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
 			    session->hists.stats.nr_invalid_chains,
 			    session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
 	}
}

#define session_done()	(*(volatile int *)(&session_done))
volatile int session_done;

static int __perf_session__process_pipe_events(struct perf_session *self,
					       struct perf_event_ops *ops)
{
	union perf_event event;
	uint32_t size;
	int skip = 0;
	u64 head;
	int err;
	void *p;

	perf_event_ops__fill_defaults(ops);

	head = 0;
more:
	err = readn(self->fd, &event, sizeof(struct perf_event_header));
	if (err <= 0) {
		if (err == 0)
			goto done;

		pr_err("failed to read event header\n");
		goto out_err;
	}

	if (self->header.needs_swap)
		perf_event_header__bswap(&event.header);

	size = event.header.size;
	if (size == 0)
		size = 8;

	p = &event;
	p += sizeof(struct perf_event_header);

	if (size - sizeof(struct perf_event_header)) {
		err = readn(self->fd, p, size - sizeof(struct perf_event_header));
		if (err <= 0) {
			if (err == 0) {
				pr_err("unexpected end of event stream\n");
				goto done;
			}

			pr_err("failed to read event data\n");
			goto out_err;
		}
	}

	if (size == 0 ||
	    (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
		dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
			    head, event.header.size, event.header.type);
		/*
		 * assume we lost track of the stream, check alignment, and
		 * increment a single u64 in the hope to catch on again 'soon'.
		 */
		if (unlikely(head & 7))
			head &= ~7ULL;

		size = 8;
	}

	head += size;

	if (skip > 0)
		head += skip;

	if (!session_done())
		goto more;
done:
	err = 0;
out_err:
	perf_session__warn_about_errors(self, ops);
	perf_session_free_sample_buffers(self);
	return err;
}

static union perf_event *
fetch_mmaped_event(struct perf_session *session,
		   u64 head, size_t mmap_size, char *buf)
{
	union perf_event *event;

	/*
	 * Ensure we have enough space remaining to read
	 * the size of the event in the headers.
	 */
	if (head + sizeof(event->header) > mmap_size)
		return NULL;

	event = (union perf_event *)(buf + head);

	if (session->header.needs_swap)
		perf_event_header__bswap(&event->header);

	if (head + event->header.size > mmap_size)
		return NULL;

	return event;
}

int __perf_session__process_events(struct perf_session *session,
				   u64 data_offset, u64 data_size,
				   u64 file_size, struct perf_event_ops *ops)
{
	u64 head, page_offset, file_offset, file_pos, progress_next;
	int err, mmap_prot, mmap_flags, map_idx = 0;
	struct ui_progress *progress;
	size_t	page_size, mmap_size;
	char *buf, *mmaps[8];
	union perf_event *event;
	uint32_t size;

	perf_event_ops__fill_defaults(ops);

	page_size = sysconf(_SC_PAGESIZE);

	page_offset = page_size * (data_offset / page_size);
	file_offset = page_offset;
	head = data_offset - page_offset;

	if (data_offset + data_size < file_size)
		file_size = data_offset + data_size;

	progress_next = file_size / 16;
	progress = ui_progress__new("Processing events...", file_size);
	if (progress == NULL)
		return -1;

	mmap_size = session->mmap_window;
	if (mmap_size > file_size)
		mmap_size = file_size;

	memset(mmaps, 0, sizeof(mmaps));

	mmap_prot  = PROT_READ;
	mmap_flags = MAP_SHARED;

	if (session->header.needs_swap) {
		mmap_prot  |= PROT_WRITE;
		mmap_flags = MAP_PRIVATE;
	}
remap:
	buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
		   file_offset);
	if (buf == MAP_FAILED) {
		pr_err("failed to mmap file\n");
		err = -errno;
		goto out_err;
	}
	mmaps[map_idx] = buf;
	map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
	file_pos = file_offset + head;

more:
	event = fetch_mmaped_event(session, head, mmap_size, buf);
	if (!event) {
		if (mmaps[map_idx]) {
			munmap(mmaps[map_idx], mmap_size);
			mmaps[map_idx] = NULL;
		}

		page_offset = page_size * (head / page_size);
		file_offset += page_offset;
		head -= page_offset;
		goto remap;
	}

	size = event->header.size;

	if (size == 0 ||
	    perf_session__process_event(session, event, ops, file_pos) < 0) {
		dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
			    file_offset + head, event->header.size,
			    event->header.type);
		/*
		 * assume we lost track of the stream, check alignment, and
		 * increment a single u64 in the hope to catch on again 'soon'.
		 */
		if (unlikely(head & 7))
			head &= ~7ULL;

		size = 8;
	}

	head += size;
	file_pos += size;

	if (file_pos >= progress_next) {
		progress_next += file_size / 16;
		ui_progress__update(progress, file_pos);
	}

	if (file_pos < file_size)
		goto more;

	err = 0;
	/* do the final flush for ordered samples */
	session->ordered_samples.next_flush = ULLONG_MAX;
	flush_sample_queue(session, ops);
out_err:
	ui_progress__delete(progress);
	perf_session__warn_about_errors(session, ops);
	perf_session_free_sample_buffers(session);
	return err;
}

int perf_session__process_events(struct perf_session *self,
				 struct perf_event_ops *ops)
{
	int err;

	if (perf_session__register_idle_thread(self) == NULL)
		return -ENOMEM;

	if (!self->fd_pipe)
		err = __perf_session__process_events(self,
						     self->header.data_offset,
						     self->header.data_size,
						     self->size, ops);
	else
		err = __perf_session__process_pipe_events(self, ops);

	return err;
}

bool perf_session__has_traces(struct perf_session *self, const char *msg)
{
	if (!(self->sample_type & PERF_SAMPLE_RAW)) {
		pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
		return false;
	}

	return true;
}

int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
					     const char *symbol_name,
					     u64 addr)
{
	char *bracket;
	enum map_type i;
	struct ref_reloc_sym *ref;

	ref = zalloc(sizeof(struct ref_reloc_sym));
	if (ref == NULL)
		return -ENOMEM;

	ref->name = strdup(symbol_name);
	if (ref->name == NULL) {
		free(ref);
		return -ENOMEM;
	}

	bracket = strchr(ref->name, ']');
	if (bracket)
		*bracket = '\0';

	ref->addr = addr;

	for (i = 0; i < MAP__NR_TYPES; ++i) {
		struct kmap *kmap = map__kmap(maps[i]);
		kmap->ref_reloc_sym = ref;
	}

	return 0;
}

size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
{
	return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
	       __dsos__fprintf(&self->host_machine.user_dsos, fp) +
	       machines__fprintf_dsos(&self->machines, fp);
}

size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
					  bool with_hits)
{
	size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
	return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
}

size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
{
	struct perf_evsel *pos;
	size_t ret = fprintf(fp, "Aggregated stats:\n");

	ret += hists__fprintf_nr_events(&session->hists, fp);

	list_for_each_entry(pos, &session->evlist->entries, node) {
		ret += fprintf(fp, "%s stats:\n", event_name(pos));
		ret += hists__fprintf_nr_events(&pos->hists, fp);
	}

	return ret;
}

struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
					      unsigned int type)
{
	struct perf_evsel *pos;

	list_for_each_entry(pos, &session->evlist->entries, node) {
		if (pos->attr.type == type)
			return pos;
	}
	return NULL;
}

void perf_session__print_ip(union perf_event *event,
			    struct perf_sample *sample,
			    struct perf_session *session,
			    int print_sym, int print_dso)
{
	struct addr_location al;
	const char *symname, *dsoname;
	struct callchain_cursor *cursor = &session->callchain_cursor;
	struct callchain_cursor_node *node;

	if (perf_event__preprocess_sample(event, session, &al, sample,
					  NULL) < 0) {
		error("problem processing %d event, skipping it.\n",
			event->header.type);
		return;
	}

	if (symbol_conf.use_callchain && sample->callchain) {

		if (perf_session__resolve_callchain(session, al.thread,
						sample->callchain, NULL) != 0) {
			if (verbose)
				error("Failed to resolve callchain. Skipping\n");
			return;
		}
		callchain_cursor_commit(cursor);

		while (1) {
			node = callchain_cursor_current(cursor);
			if (!node)
				break;

			printf("\t%16" PRIx64, node->ip);
			if (print_sym) {
				if (node->sym && node->sym->name)
					symname = node->sym->name;
				else
					symname = "";

				printf(" %s", symname);
			}
			if (print_dso) {
				if (node->map && node->map->dso && node->map->dso->name)
					dsoname = node->map->dso->name;
				else
					dsoname = "";

				printf(" (%s)", dsoname);
			}
			printf("\n");

			callchain_cursor_advance(cursor);
		}

	} else {
		printf("%16" PRIx64, al.addr);
		if (print_sym) {
			if (al.sym && al.sym->name)
				symname = al.sym->name;
			else
				symname = "";

			printf(" %s", symname);
		}

		if (print_dso) {
			if (al.map && al.map->dso && al.map->dso->name)
				dsoname = al.map->dso->name;
			else
				dsoname = "";

			printf(" (%s)", dsoname);
		}
	}
}

int perf_session__cpu_bitmap(struct perf_session *session,
			     const char *cpu_list, unsigned long *cpu_bitmap)
{
	int i;
	struct cpu_map *map;

	for (i = 0; i < PERF_TYPE_MAX; ++i) {
		struct perf_evsel *evsel;

		evsel = perf_session__find_first_evtype(session, i);
		if (!evsel)
			continue;

		if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
			pr_err("File does not contain CPU events. "
			       "Remove -c option to proceed.\n");
			return -1;
		}
	}

	map = cpu_map__new(cpu_list);

	for (i = 0; i < map->nr; i++) {
		int cpu = map->map[i];

		if (cpu >= MAX_NR_CPUS) {
			pr_err("Requested CPU %d too large. "
			       "Consider raising MAX_NR_CPUS\n", cpu);
			return -1;
		}

		set_bit(cpu, cpu_bitmap);
	}

	return 0;
}