summaryrefslogtreecommitdiff
path: root/tools/perf/builtin-lock.c
blob: 4db5e52930672d1ab1d3b5f230357bdf355e0335 (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
#include "builtin.h"
#include "perf.h"

#include "util/util.h"
#include "util/cache.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"

#include "util/parse-options.h"
#include "util/trace-event.h"

#include "util/debug.h"
#include "util/session.h"
#include "util/tool.h"

#include <sys/types.h>
#include <sys/prctl.h>
#include <semaphore.h>
#include <pthread.h>
#include <math.h>
#include <limits.h>

#include <linux/list.h>
#include <linux/hash.h>

static struct perf_session *session;

/* based on kernel/lockdep.c */
#define LOCKHASH_BITS		12
#define LOCKHASH_SIZE		(1UL << LOCKHASH_BITS)

static struct list_head lockhash_table[LOCKHASH_SIZE];

#define __lockhashfn(key)	hash_long((unsigned long)key, LOCKHASH_BITS)
#define lockhashentry(key)	(lockhash_table + __lockhashfn((key)))

struct lock_stat {
	struct list_head	hash_entry;
	struct rb_node		rb;		/* used for sorting */

	/*
	 * FIXME: raw_field_value() returns unsigned long long,
	 * so address of lockdep_map should be dealed as 64bit.
	 * Is there more better solution?
	 */
	void			*addr;		/* address of lockdep_map, used as ID */
	char			*name;		/* for strcpy(), we cannot use const */

	unsigned int		nr_acquire;
	unsigned int		nr_acquired;
	unsigned int		nr_contended;
	unsigned int		nr_release;

	unsigned int		nr_readlock;
	unsigned int		nr_trylock;
	/* these times are in nano sec. */
	u64			wait_time_total;
	u64			wait_time_min;
	u64			wait_time_max;

	int			discard; /* flag of blacklist */
};

/*
 * States of lock_seq_stat
 *
 * UNINITIALIZED is required for detecting first event of acquire.
 * As the nature of lock events, there is no guarantee
 * that the first event for the locks are acquire,
 * it can be acquired, contended or release.
 */
#define SEQ_STATE_UNINITIALIZED      0	       /* initial state */
#define SEQ_STATE_RELEASED	1
#define SEQ_STATE_ACQUIRING	2
#define SEQ_STATE_ACQUIRED	3
#define SEQ_STATE_READ_ACQUIRED	4
#define SEQ_STATE_CONTENDED	5

/*
 * MAX_LOCK_DEPTH
 * Imported from include/linux/sched.h.
 * Should this be synchronized?
 */
#define MAX_LOCK_DEPTH 48

/*
 * struct lock_seq_stat:
 * Place to put on state of one lock sequence
 * 1) acquire -> acquired -> release
 * 2) acquire -> contended -> acquired -> release
 * 3) acquire (with read or try) -> release
 * 4) Are there other patterns?
 */
struct lock_seq_stat {
	struct list_head        list;
	int			state;
	u64			prev_event_time;
	void                    *addr;

	int                     read_count;
};

struct thread_stat {
	struct rb_node		rb;

	u32                     tid;
	struct list_head        seq_list;
};

static struct rb_root		thread_stats;

static struct thread_stat *thread_stat_find(u32 tid)
{
	struct rb_node *node;
	struct thread_stat *st;

	node = thread_stats.rb_node;
	while (node) {
		st = container_of(node, struct thread_stat, rb);
		if (st->tid == tid)
			return st;
		else if (tid < st->tid)
			node = node->rb_left;
		else
			node = node->rb_right;
	}

	return NULL;
}

static void thread_stat_insert(struct thread_stat *new)
{
	struct rb_node **rb = &thread_stats.rb_node;
	struct rb_node *parent = NULL;
	struct thread_stat *p;

	while (*rb) {
		p = container_of(*rb, struct thread_stat, rb);
		parent = *rb;

		if (new->tid < p->tid)
			rb = &(*rb)->rb_left;
		else if (new->tid > p->tid)
			rb = &(*rb)->rb_right;
		else
			BUG_ON("inserting invalid thread_stat\n");
	}

	rb_link_node(&new->rb, parent, rb);
	rb_insert_color(&new->rb, &thread_stats);
}

static struct thread_stat *thread_stat_findnew_after_first(u32 tid)
{
	struct thread_stat *st;

	st = thread_stat_find(tid);
	if (st)
		return st;

	st = zalloc(sizeof(struct thread_stat));
	if (!st)
		die("memory allocation failed\n");

	st->tid = tid;
	INIT_LIST_HEAD(&st->seq_list);

	thread_stat_insert(st);

	return st;
}

static struct thread_stat *thread_stat_findnew_first(u32 tid);
static struct thread_stat *(*thread_stat_findnew)(u32 tid) =
	thread_stat_findnew_first;

static struct thread_stat *thread_stat_findnew_first(u32 tid)
{
	struct thread_stat *st;

	st = zalloc(sizeof(struct thread_stat));
	if (!st)
		die("memory allocation failed\n");
	st->tid = tid;
	INIT_LIST_HEAD(&st->seq_list);

	rb_link_node(&st->rb, NULL, &thread_stats.rb_node);
	rb_insert_color(&st->rb, &thread_stats);

	thread_stat_findnew = thread_stat_findnew_after_first;
	return st;
}

/* build simple key function one is bigger than two */
#define SINGLE_KEY(member)						\
	static int lock_stat_key_ ## member(struct lock_stat *one,	\
					 struct lock_stat *two)		\
	{								\
		return one->member > two->member;			\
	}

SINGLE_KEY(nr_acquired)
SINGLE_KEY(nr_contended)
SINGLE_KEY(wait_time_total)
SINGLE_KEY(wait_time_max)

static int lock_stat_key_wait_time_min(struct lock_stat *one,
					struct lock_stat *two)
{
	u64 s1 = one->wait_time_min;
	u64 s2 = two->wait_time_min;
	if (s1 == ULLONG_MAX)
		s1 = 0;
	if (s2 == ULLONG_MAX)
		s2 = 0;
	return s1 > s2;
}

struct lock_key {
	/*
	 * name: the value for specify by user
	 * this should be simpler than raw name of member
	 * e.g. nr_acquired -> acquired, wait_time_total -> wait_total
	 */
	const char		*name;
	int			(*key)(struct lock_stat*, struct lock_stat*);
};

static const char		*sort_key = "acquired";

static int			(*compare)(struct lock_stat *, struct lock_stat *);

static struct rb_root		result;	/* place to store sorted data */

#define DEF_KEY_LOCK(name, fn_suffix)	\
	{ #name, lock_stat_key_ ## fn_suffix }
struct lock_key keys[] = {
	DEF_KEY_LOCK(acquired, nr_acquired),
	DEF_KEY_LOCK(contended, nr_contended),
	DEF_KEY_LOCK(wait_total, wait_time_total),
	DEF_KEY_LOCK(wait_min, wait_time_min),
	DEF_KEY_LOCK(wait_max, wait_time_max),

	/* extra comparisons much complicated should be here */

	{ NULL, NULL }
};

static void select_key(void)
{
	int i;

	for (i = 0; keys[i].name; i++) {
		if (!strcmp(keys[i].name, sort_key)) {
			compare = keys[i].key;
			return;
		}
	}

	die("Unknown compare key:%s\n", sort_key);
}

static void insert_to_result(struct lock_stat *st,
			     int (*bigger)(struct lock_stat *, struct lock_stat *))
{
	struct rb_node **rb = &result.rb_node;
	struct rb_node *parent = NULL;
	struct lock_stat *p;

	while (*rb) {
		p = container_of(*rb, struct lock_stat, rb);
		parent = *rb;

		if (bigger(st, p))
			rb = &(*rb)->rb_left;
		else
			rb = &(*rb)->rb_right;
	}

	rb_link_node(&st->rb, parent, rb);
	rb_insert_color(&st->rb, &result);
}

/* returns left most element of result, and erase it */
static struct lock_stat *pop_from_result(void)
{
	struct rb_node *node = result.rb_node;

	if (!node)
		return NULL;

	while (node->rb_left)
		node = node->rb_left;

	rb_erase(node, &result);
	return container_of(node, struct lock_stat, rb);
}

static struct lock_stat *lock_stat_findnew(void *addr, const char *name)
{
	struct list_head *entry = lockhashentry(addr);
	struct lock_stat *ret, *new;

	list_for_each_entry(ret, entry, hash_entry) {
		if (ret->addr == addr)
			return ret;
	}

	new = zalloc(sizeof(struct lock_stat));
	if (!new)
		goto alloc_failed;

	new->addr = addr;
	new->name = zalloc(sizeof(char) * strlen(name) + 1);
	if (!new->name)
		goto alloc_failed;
	strcpy(new->name, name);

	new->wait_time_min = ULLONG_MAX;

	list_add(&new->hash_entry, entry);
	return new;

alloc_failed:
	die("memory allocation failed\n");
}

static char			const *input_name = "perf.data";

struct raw_event_sample {
	u32			size;
	char			data[0];
};

struct trace_acquire_event {
	void			*addr;
	const char		*name;
	int			flag;
};

struct trace_acquired_event {
	void			*addr;
	const char		*name;
};

struct trace_contended_event {
	void			*addr;
	const char		*name;
};

struct trace_release_event {
	void			*addr;
	const char		*name;
};

struct trace_lock_handler {
	void (*acquire_event)(struct trace_acquire_event *,
			      struct event *,
			      int cpu,
			      u64 timestamp,
			      struct thread *thread);

	void (*acquired_event)(struct trace_acquired_event *,
			       struct event *,
			       int cpu,
			       u64 timestamp,
			       struct thread *thread);

	void (*contended_event)(struct trace_contended_event *,
				struct event *,
				int cpu,
				u64 timestamp,
				struct thread *thread);

	void (*release_event)(struct trace_release_event *,
			      struct event *,
			      int cpu,
			      u64 timestamp,
			      struct thread *thread);
};

static struct lock_seq_stat *get_seq(struct thread_stat *ts, void *addr)
{
	struct lock_seq_stat *seq;

	list_for_each_entry(seq, &ts->seq_list, list) {
		if (seq->addr == addr)
			return seq;
	}

	seq = zalloc(sizeof(struct lock_seq_stat));
	if (!seq)
		die("Not enough memory\n");
	seq->state = SEQ_STATE_UNINITIALIZED;
	seq->addr = addr;

	list_add(&seq->list, &ts->seq_list);
	return seq;
}

enum broken_state {
	BROKEN_ACQUIRE,
	BROKEN_ACQUIRED,
	BROKEN_CONTENDED,
	BROKEN_RELEASE,
	BROKEN_MAX,
};

static int bad_hist[BROKEN_MAX];

enum acquire_flags {
	TRY_LOCK = 1,
	READ_LOCK = 2,
};

static void
report_lock_acquire_event(struct trace_acquire_event *acquire_event,
			struct event *__event __used,
			int cpu __used,
			u64 timestamp __used,
			struct thread *thread __used)
{
	struct lock_stat *ls;
	struct thread_stat *ts;
	struct lock_seq_stat *seq;

	ls = lock_stat_findnew(acquire_event->addr, acquire_event->name);
	if (ls->discard)
		return;

	ts = thread_stat_findnew(thread->pid);
	seq = get_seq(ts, acquire_event->addr);

	switch (seq->state) {
	case SEQ_STATE_UNINITIALIZED:
	case SEQ_STATE_RELEASED:
		if (!acquire_event->flag) {
			seq->state = SEQ_STATE_ACQUIRING;
		} else {
			if (acquire_event->flag & TRY_LOCK)
				ls->nr_trylock++;
			if (acquire_event->flag & READ_LOCK)
				ls->nr_readlock++;
			seq->state = SEQ_STATE_READ_ACQUIRED;
			seq->read_count = 1;
			ls->nr_acquired++;
		}
		break;
	case SEQ_STATE_READ_ACQUIRED:
		if (acquire_event->flag & READ_LOCK) {
			seq->read_count++;
			ls->nr_acquired++;
			goto end;
		} else {
			goto broken;
		}
		break;
	case SEQ_STATE_ACQUIRED:
	case SEQ_STATE_ACQUIRING:
	case SEQ_STATE_CONTENDED:
broken:
		/* broken lock sequence, discard it */
		ls->discard = 1;
		bad_hist[BROKEN_ACQUIRE]++;
		list_del(&seq->list);
		free(seq);
		goto end;
		break;
	default:
		BUG_ON("Unknown state of lock sequence found!\n");
		break;
	}

	ls->nr_acquire++;
	seq->prev_event_time = timestamp;
end:
	return;
}

static void
report_lock_acquired_event(struct trace_acquired_event *acquired_event,
			 struct event *__event __used,
			 int cpu __used,
			 u64 timestamp __used,
			 struct thread *thread __used)
{
	struct lock_stat *ls;
	struct thread_stat *ts;
	struct lock_seq_stat *seq;
	u64 contended_term;

	ls = lock_stat_findnew(acquired_event->addr, acquired_event->name);
	if (ls->discard)
		return;

	ts = thread_stat_findnew(thread->pid);
	seq = get_seq(ts, acquired_event->addr);

	switch (seq->state) {
	case SEQ_STATE_UNINITIALIZED:
		/* orphan event, do nothing */
		return;
	case SEQ_STATE_ACQUIRING:
		break;
	case SEQ_STATE_CONTENDED:
		contended_term = timestamp - seq->prev_event_time;
		ls->wait_time_total += contended_term;
		if (contended_term < ls->wait_time_min)
			ls->wait_time_min = contended_term;
		if (ls->wait_time_max < contended_term)
			ls->wait_time_max = contended_term;
		break;
	case SEQ_STATE_RELEASED:
	case SEQ_STATE_ACQUIRED:
	case SEQ_STATE_READ_ACQUIRED:
		/* broken lock sequence, discard it */
		ls->discard = 1;
		bad_hist[BROKEN_ACQUIRED]++;
		list_del(&seq->list);
		free(seq);
		goto end;
		break;

	default:
		BUG_ON("Unknown state of lock sequence found!\n");
		break;
	}

	seq->state = SEQ_STATE_ACQUIRED;
	ls->nr_acquired++;
	seq->prev_event_time = timestamp;
end:
	return;
}

static void
report_lock_contended_event(struct trace_contended_event *contended_event,
			  struct event *__event __used,
			  int cpu __used,
			  u64 timestamp __used,
			  struct thread *thread __used)
{
	struct lock_stat *ls;
	struct thread_stat *ts;
	struct lock_seq_stat *seq;

	ls = lock_stat_findnew(contended_event->addr, contended_event->name);
	if (ls->discard)
		return;

	ts = thread_stat_findnew(thread->pid);
	seq = get_seq(ts, contended_event->addr);

	switch (seq->state) {
	case SEQ_STATE_UNINITIALIZED:
		/* orphan event, do nothing */
		return;
	case SEQ_STATE_ACQUIRING:
		break;
	case SEQ_STATE_RELEASED:
	case SEQ_STATE_ACQUIRED:
	case SEQ_STATE_READ_ACQUIRED:
	case SEQ_STATE_CONTENDED:
		/* broken lock sequence, discard it */
		ls->discard = 1;
		bad_hist[BROKEN_CONTENDED]++;
		list_del(&seq->list);
		free(seq);
		goto end;
		break;
	default:
		BUG_ON("Unknown state of lock sequence found!\n");
		break;
	}

	seq->state = SEQ_STATE_CONTENDED;
	ls->nr_contended++;
	seq->prev_event_time = timestamp;
end:
	return;
}

static void
report_lock_release_event(struct trace_release_event *release_event,
			struct event *__event __used,
			int cpu __used,
			u64 timestamp __used,
			struct thread *thread __used)
{
	struct lock_stat *ls;
	struct thread_stat *ts;
	struct lock_seq_stat *seq;

	ls = lock_stat_findnew(release_event->addr, release_event->name);
	if (ls->discard)
		return;

	ts = thread_stat_findnew(thread->pid);
	seq = get_seq(ts, release_event->addr);

	switch (seq->state) {
	case SEQ_STATE_UNINITIALIZED:
		goto end;
		break;
	case SEQ_STATE_ACQUIRED:
		break;
	case SEQ_STATE_READ_ACQUIRED:
		seq->read_count--;
		BUG_ON(seq->read_count < 0);
		if (!seq->read_count) {
			ls->nr_release++;
			goto end;
		}
		break;
	case SEQ_STATE_ACQUIRING:
	case SEQ_STATE_CONTENDED:
	case SEQ_STATE_RELEASED:
		/* broken lock sequence, discard it */
		ls->discard = 1;
		bad_hist[BROKEN_RELEASE]++;
		goto free_seq;
		break;
	default:
		BUG_ON("Unknown state of lock sequence found!\n");
		break;
	}

	ls->nr_release++;
free_seq:
	list_del(&seq->list);
	free(seq);
end:
	return;
}

/* lock oriented handlers */
/* TODO: handlers for CPU oriented, thread oriented */
static struct trace_lock_handler report_lock_ops  = {
	.acquire_event		= report_lock_acquire_event,
	.acquired_event		= report_lock_acquired_event,
	.contended_event	= report_lock_contended_event,
	.release_event		= report_lock_release_event,
};

static struct trace_lock_handler *trace_handler;

static void
process_lock_acquire_event(void *data,
			   struct event *event __used,
			   int cpu __used,
			   u64 timestamp __used,
			   struct thread *thread __used)
{
	struct trace_acquire_event acquire_event;
	u64 tmp;		/* this is required for casting... */

	tmp = raw_field_value(event, "lockdep_addr", data);
	memcpy(&acquire_event.addr, &tmp, sizeof(void *));
	acquire_event.name = (char *)raw_field_ptr(event, "name", data);
	acquire_event.flag = (int)raw_field_value(event, "flag", data);

	if (trace_handler->acquire_event)
		trace_handler->acquire_event(&acquire_event, event, cpu, timestamp, thread);
}

static void
process_lock_acquired_event(void *data,
			    struct event *event __used,
			    int cpu __used,
			    u64 timestamp __used,
			    struct thread *thread __used)
{
	struct trace_acquired_event acquired_event;
	u64 tmp;		/* this is required for casting... */

	tmp = raw_field_value(event, "lockdep_addr", data);
	memcpy(&acquired_event.addr, &tmp, sizeof(void *));
	acquired_event.name = (char *)raw_field_ptr(event, "name", data);

	if (trace_handler->acquire_event)
		trace_handler->acquired_event(&acquired_event, event, cpu, timestamp, thread);
}

static void
process_lock_contended_event(void *data,
			     struct event *event __used,
			     int cpu __used,
			     u64 timestamp __used,
			     struct thread *thread __used)
{
	struct trace_contended_event contended_event;
	u64 tmp;		/* this is required for casting... */

	tmp = raw_field_value(event, "lockdep_addr", data);
	memcpy(&contended_event.addr, &tmp, sizeof(void *));
	contended_event.name = (char *)raw_field_ptr(event, "name", data);

	if (trace_handler->acquire_event)
		trace_handler->contended_event(&contended_event, event, cpu, timestamp, thread);
}

static void
process_lock_release_event(void *data,
			   struct event *event __used,
			   int cpu __used,
			   u64 timestamp __used,
			   struct thread *thread __used)
{
	struct trace_release_event release_event;
	u64 tmp;		/* this is required for casting... */

	tmp = raw_field_value(event, "lockdep_addr", data);
	memcpy(&release_event.addr, &tmp, sizeof(void *));
	release_event.name = (char *)raw_field_ptr(event, "name", data);

	if (trace_handler->acquire_event)
		trace_handler->release_event(&release_event, event, cpu, timestamp, thread);
}

static void
process_raw_event(void *data, int cpu, u64 timestamp, struct thread *thread)
{
	struct event *event;
	int type;

	type = trace_parse_common_type(data);
	event = trace_find_event(type);

	if (!strcmp(event->name, "lock_acquire"))
		process_lock_acquire_event(data, event, cpu, timestamp, thread);
	if (!strcmp(event->name, "lock_acquired"))
		process_lock_acquired_event(data, event, cpu, timestamp, thread);
	if (!strcmp(event->name, "lock_contended"))
		process_lock_contended_event(data, event, cpu, timestamp, thread);
	if (!strcmp(event->name, "lock_release"))
		process_lock_release_event(data, event, cpu, timestamp, thread);
}

static void print_bad_events(int bad, int total)
{
	/* Output for debug, this have to be removed */
	int i;
	const char *name[4] =
		{ "acquire", "acquired", "contended", "release" };

	pr_info("\n=== output for debug===\n\n");
	pr_info("bad: %d, total: %d\n", bad, total);
	pr_info("bad rate: %f %%\n", (double)bad / (double)total * 100);
	pr_info("histogram of events caused bad sequence\n");
	for (i = 0; i < BROKEN_MAX; i++)
		pr_info(" %10s: %d\n", name[i], bad_hist[i]);
}

/* TODO: various way to print, coloring, nano or milli sec */
static void print_result(void)
{
	struct lock_stat *st;
	char cut_name[20];
	int bad, total;

	pr_info("%20s ", "Name");
	pr_info("%10s ", "acquired");
	pr_info("%10s ", "contended");

	pr_info("%15s ", "total wait (ns)");
	pr_info("%15s ", "max wait (ns)");
	pr_info("%15s ", "min wait (ns)");

	pr_info("\n\n");

	bad = total = 0;
	while ((st = pop_from_result())) {
		total++;
		if (st->discard) {
			bad++;
			continue;
		}
		bzero(cut_name, 20);

		if (strlen(st->name) < 16) {
			/* output raw name */
			pr_info("%20s ", st->name);
		} else {
			strncpy(cut_name, st->name, 16);
			cut_name[16] = '.';
			cut_name[17] = '.';
			cut_name[18] = '.';
			cut_name[19] = '\0';
			/* cut off name for saving output style */
			pr_info("%20s ", cut_name);
		}

		pr_info("%10u ", st->nr_acquired);
		pr_info("%10u ", st->nr_contended);

		pr_info("%15" PRIu64 " ", st->wait_time_total);
		pr_info("%15" PRIu64 " ", st->wait_time_max);
		pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ?
		       0 : st->wait_time_min);
		pr_info("\n");
	}

	print_bad_events(bad, total);
}

static bool info_threads, info_map;

static void dump_threads(void)
{
	struct thread_stat *st;
	struct rb_node *node;
	struct thread *t;

	pr_info("%10s: comm\n", "Thread ID");

	node = rb_first(&thread_stats);
	while (node) {
		st = container_of(node, struct thread_stat, rb);
		t = perf_session__findnew(session, st->tid);
		pr_info("%10d: %s\n", st->tid, t->comm);
		node = rb_next(node);
	};
}

static void dump_map(void)
{
	unsigned int i;
	struct lock_stat *st;

	pr_info("Address of instance: name of class\n");
	for (i = 0; i < LOCKHASH_SIZE; i++) {
		list_for_each_entry(st, &lockhash_table[i], hash_entry) {
			pr_info(" %p: %s\n", st->addr, st->name);
		}
	}
}

static void dump_info(void)
{
	if (info_threads)
		dump_threads();
	else if (info_map)
		dump_map();
	else
		die("Unknown type of information\n");
}

static int process_sample_event(struct perf_tool *tool __used,
				union perf_event *event,
				struct perf_sample *sample,
				struct perf_evsel *evsel __used,
				struct machine *machine)
{
	struct thread *thread = machine__findnew_thread(machine, sample->tid);

	if (thread == NULL) {
		pr_debug("problem processing %d event, skipping it.\n",
			event->header.type);
		return -1;
	}

	process_raw_event(sample->raw_data, sample->cpu, sample->time, thread);

	return 0;
}

static struct perf_tool eops = {
	.sample			= process_sample_event,
	.comm			= perf_event__process_comm,
	.ordered_samples	= true,
};

static int read_events(void)
{
	session = perf_session__new(input_name, O_RDONLY, 0, false, &eops);
	if (!session)
		die("Initializing perf session failed\n");

	return perf_session__process_events(session, &eops);
}

static void sort_result(void)
{
	unsigned int i;
	struct lock_stat *st;

	for (i = 0; i < LOCKHASH_SIZE; i++) {
		list_for_each_entry(st, &lockhash_table[i], hash_entry) {
			insert_to_result(st, compare);
		}
	}
}

static void __cmd_report(void)
{
	setup_pager();
	select_key();
	read_events();
	sort_result();
	print_result();
}

static const char * const report_usage[] = {
	"perf lock report [<options>]",
	NULL
};

static const struct option report_options[] = {
	OPT_STRING('k', "key", &sort_key, "acquired",
		    "key for sorting (acquired / contended / wait_total / wait_max / wait_min)"),
	/* TODO: type */
	OPT_END()
};

static const char * const info_usage[] = {
	"perf lock info [<options>]",
	NULL
};

static const struct option info_options[] = {
	OPT_BOOLEAN('t', "threads", &info_threads,
		    "dump thread list in perf.data"),
	OPT_BOOLEAN('m', "map", &info_map,
		    "map of lock instances (name:address table)"),
	OPT_END()
};

static const char * const lock_usage[] = {
	"perf lock [<options>] {record|trace|report}",
	NULL
};

static const struct option lock_options[] = {
	OPT_STRING('i', "input", &input_name, "file", "input file name"),
	OPT_INCR('v', "verbose", &verbose, "be more verbose (show symbol address, etc)"),
	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, "dump raw trace in ASCII"),
	OPT_END()
};

static const char *record_args[] = {
	"record",
	"-R",
	"-f",
	"-m", "1024",
	"-c", "1",
	"-e", "lock:lock_acquire",
	"-e", "lock:lock_acquired",
	"-e", "lock:lock_contended",
	"-e", "lock:lock_release",
};

static int __cmd_record(int argc, const char **argv)
{
	unsigned int rec_argc, i, j;
	const char **rec_argv;

	rec_argc = ARRAY_SIZE(record_args) + argc - 1;
	rec_argv = calloc(rec_argc + 1, sizeof(char *));

	if (rec_argv == NULL)
		return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(record_args); i++)
		rec_argv[i] = strdup(record_args[i]);

	for (j = 1; j < (unsigned int)argc; j++, i++)
		rec_argv[i] = argv[j];

	BUG_ON(i != rec_argc);

	return cmd_record(i, rec_argv, NULL);
}

int cmd_lock(int argc, const char **argv, const char *prefix __used)
{
	unsigned int i;

	symbol__init();
	for (i = 0; i < LOCKHASH_SIZE; i++)
		INIT_LIST_HEAD(lockhash_table + i);

	argc = parse_options(argc, argv, lock_options, lock_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);
	if (!argc)
		usage_with_options(lock_usage, lock_options);

	if (!strncmp(argv[0], "rec", 3)) {
		return __cmd_record(argc, argv);
	} else if (!strncmp(argv[0], "report", 6)) {
		trace_handler = &report_lock_ops;
		if (argc) {
			argc = parse_options(argc, argv,
					     report_options, report_usage, 0);
			if (argc)
				usage_with_options(report_usage, report_options);
		}
		__cmd_report();
	} else if (!strcmp(argv[0], "script")) {
		/* Aliased to 'perf script' */
		return cmd_script(argc, argv, prefix);
	} else if (!strcmp(argv[0], "info")) {
		if (argc) {
			argc = parse_options(argc, argv,
					     info_options, info_usage, 0);
			if (argc)
				usage_with_options(info_usage, info_options);
		}
		/* recycling report_lock_ops */
		trace_handler = &report_lock_ops;
		setup_pager();
		read_events();
		dump_info();
	} else {
		usage_with_options(lock_usage, lock_options);
	}

	return 0;
}