summaryrefslogtreecommitdiff
path: root/tools/perf/util/metricgroup.c
blob: 99d047c5ead0f26a2f0ad4e4da6b4828b1d8ecf4 (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
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2017, Intel Corporation.
 */

/* Manage metrics and groups of metrics from JSON files */

#include "metricgroup.h"
#include "debug.h"
#include "evlist.h"
#include "evsel.h"
#include "strbuf.h"
#include "pmu.h"
#include "expr.h"
#include "rblist.h"
#include <string.h>
#include <errno.h>
#include "strlist.h"
#include <assert.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <subcmd/parse-options.h>
#include <api/fs/fs.h>
#include "util.h"
#include <asm/bug.h>
#include "cgroup.h"

struct metric_event *metricgroup__lookup(struct rblist *metric_events,
					 struct evsel *evsel,
					 bool create)
{
	struct rb_node *nd;
	struct metric_event me = {
		.evsel = evsel
	};

	if (!metric_events)
		return NULL;

	nd = rblist__find(metric_events, &me);
	if (nd)
		return container_of(nd, struct metric_event, nd);
	if (create) {
		rblist__add_node(metric_events, &me);
		nd = rblist__find(metric_events, &me);
		if (nd)
			return container_of(nd, struct metric_event, nd);
	}
	return NULL;
}

static int metric_event_cmp(struct rb_node *rb_node, const void *entry)
{
	struct metric_event *a = container_of(rb_node,
					      struct metric_event,
					      nd);
	const struct metric_event *b = entry;

	if (a->evsel == b->evsel)
		return 0;
	if ((char *)a->evsel < (char *)b->evsel)
		return -1;
	return +1;
}

static struct rb_node *metric_event_new(struct rblist *rblist __maybe_unused,
					const void *entry)
{
	struct metric_event *me = malloc(sizeof(struct metric_event));

	if (!me)
		return NULL;
	memcpy(me, entry, sizeof(struct metric_event));
	me->evsel = ((struct metric_event *)entry)->evsel;
	INIT_LIST_HEAD(&me->head);
	return &me->nd;
}

static void metric_event_delete(struct rblist *rblist __maybe_unused,
				struct rb_node *rb_node)
{
	struct metric_event *me = container_of(rb_node, struct metric_event, nd);
	struct metric_expr *expr, *tmp;

	list_for_each_entry_safe(expr, tmp, &me->head, nd) {
		free(expr->metric_refs);
		free(expr->metric_events);
		free(expr);
	}

	free(me);
}

static void metricgroup__rblist_init(struct rblist *metric_events)
{
	rblist__init(metric_events);
	metric_events->node_cmp = metric_event_cmp;
	metric_events->node_new = metric_event_new;
	metric_events->node_delete = metric_event_delete;
}

void metricgroup__rblist_exit(struct rblist *metric_events)
{
	rblist__exit(metric_events);
}

/*
 * A node in the list of referenced metrics. metric_expr
 * is held as a convenience to avoid a search through the
 * metric list.
 */
struct metric_ref_node {
	const char *metric_name;
	const char *metric_expr;
	struct list_head list;
};

struct metric {
	struct list_head nd;
	struct expr_parse_ctx pctx;
	const char *metric_name;
	const char *metric_expr;
	const char *metric_unit;
	struct list_head metric_refs;
	int metric_refs_cnt;
	int runtime;
	bool has_constraint;
};

#define RECURSION_ID_MAX 1000

struct expr_ids {
	struct expr_id	id[RECURSION_ID_MAX];
	int		cnt;
};

static struct expr_id *expr_ids__alloc(struct expr_ids *ids)
{
	if (ids->cnt >= RECURSION_ID_MAX)
		return NULL;
	return &ids->id[ids->cnt++];
}

static void expr_ids__exit(struct expr_ids *ids)
{
	int i;

	for (i = 0; i < ids->cnt; i++)
		free(ids->id[i].id);
}

static bool contains_event(struct evsel **metric_events, int num_events,
			const char *event_name)
{
	int i;

	for (i = 0; i < num_events; i++) {
		if (!strcmp(metric_events[i]->name, event_name))
			return true;
	}
	return false;
}

static bool evsel_same_pmu_or_none(struct evsel *ev1, struct evsel *ev2)
{
	if (!ev1->pmu_name || !ev2->pmu_name)
		return true;

	return !strcmp(ev1->pmu_name, ev2->pmu_name);
}

/**
 * Find a group of events in perf_evlist that correspond to those from a parsed
 * metric expression. Note, as find_evsel_group is called in the same order as
 * perf_evlist was constructed, metric_no_merge doesn't need to test for
 * underfilling a group.
 * @perf_evlist: a list of events something like: {metric1 leader, metric1
 * sibling, metric1 sibling}:W,duration_time,{metric2 leader, metric2 sibling,
 * metric2 sibling}:W,duration_time
 * @pctx: the parse context for the metric expression.
 * @metric_no_merge: don't attempt to share events for the metric with other
 * metrics.
 * @has_constraint: is there a constraint on the group of events? In which case
 * the events won't be grouped.
 * @metric_events: out argument, null terminated array of evsel's associated
 * with the metric.
 * @evlist_used: in/out argument, bitmap tracking which evlist events are used.
 * @return the first metric event or NULL on failure.
 */
static struct evsel *find_evsel_group(struct evlist *perf_evlist,
				      struct expr_parse_ctx *pctx,
				      bool metric_no_merge,
				      bool has_constraint,
				      struct evsel **metric_events,
				      unsigned long *evlist_used)
{
	struct evsel *ev, *current_leader = NULL;
	struct expr_id_data *val_ptr;
	int i = 0, matched_events = 0, events_to_match;
	const int idnum = (int)hashmap__size(&pctx->ids);

	/*
	 * duration_time is always grouped separately, when events are grouped
	 * (ie has_constraint is false) then ignore it in the matching loop and
	 * add it to metric_events at the end.
	 */
	if (!has_constraint &&
	    hashmap__find(&pctx->ids, "duration_time", (void **)&val_ptr))
		events_to_match = idnum - 1;
	else
		events_to_match = idnum;

	evlist__for_each_entry (perf_evlist, ev) {
		/*
		 * Events with a constraint aren't grouped and match the first
		 * events available.
		 */
		if (has_constraint && ev->weak_group)
			continue;
		/* Ignore event if already used and merging is disabled. */
		if (metric_no_merge && test_bit(ev->core.idx, evlist_used))
			continue;
		if (!has_constraint && !evsel__has_leader(ev, current_leader)) {
			/*
			 * Start of a new group, discard the whole match and
			 * start again.
			 */
			matched_events = 0;
			memset(metric_events, 0,
				sizeof(struct evsel *) * idnum);
			current_leader = evsel__leader(ev);
		}
		/*
		 * Check for duplicate events with the same name. For example,
		 * uncore_imc/cas_count_read/ will turn into 6 events per socket
		 * on skylakex. Only the first such event is placed in
		 * metric_events. If events aren't grouped then this also
		 * ensures that the same event in different sibling groups
		 * aren't both added to metric_events.
		 */
		if (contains_event(metric_events, matched_events, ev->name))
			continue;
		/* Does this event belong to the parse context? */
		if (hashmap__find(&pctx->ids, ev->name, (void **)&val_ptr))
			metric_events[matched_events++] = ev;

		if (matched_events == events_to_match)
			break;
	}

	if (events_to_match != idnum) {
		/* Add the first duration_time. */
		evlist__for_each_entry(perf_evlist, ev) {
			if (!strcmp(ev->name, "duration_time")) {
				metric_events[matched_events++] = ev;
				break;
			}
		}
	}

	if (matched_events != idnum) {
		/* Not a whole match */
		return NULL;
	}

	metric_events[idnum] = NULL;

	for (i = 0; i < idnum; i++) {
		ev = metric_events[i];
		/* Don't free the used events. */
		set_bit(ev->core.idx, evlist_used);
		/*
		 * The metric leader points to the identically named event in
		 * metric_events.
		 */
		ev->metric_leader = ev;
		/*
		 * Mark two events with identical names in the same group (or
		 * globally) as being in use as uncore events may be duplicated
		 * for each pmu. Set the metric leader of such events to be the
		 * event that appears in metric_events.
		 */
		evlist__for_each_entry_continue(perf_evlist, ev) {
			/*
			 * If events are grouped then the search can terminate
			 * when then group is left.
			 */
			if (!has_constraint &&
			    ev->core.leader != metric_events[i]->core.leader &&
			    evsel_same_pmu_or_none(evsel__leader(ev), evsel__leader(metric_events[i])))
				break;
			if (!strcmp(metric_events[i]->name, ev->name)) {
				set_bit(ev->core.idx, evlist_used);
				ev->metric_leader = metric_events[i];
			}
		}
	}

	return metric_events[0];
}

static int metricgroup__setup_events(struct list_head *groups,
				     bool metric_no_merge,
				     struct evlist *perf_evlist,
				     struct rblist *metric_events_list)
{
	struct metric_event *me;
	struct metric_expr *expr;
	int i = 0;
	int ret = 0;
	struct metric *m;
	struct evsel *evsel, *tmp;
	unsigned long *evlist_used;

	evlist_used = bitmap_alloc(perf_evlist->core.nr_entries);
	if (!evlist_used)
		return -ENOMEM;

	list_for_each_entry (m, groups, nd) {
		struct evsel **metric_events;
		struct metric_ref *metric_refs = NULL;

		metric_events = calloc(sizeof(void *),
				hashmap__size(&m->pctx.ids) + 1);
		if (!metric_events) {
			ret = -ENOMEM;
			break;
		}
		evsel = find_evsel_group(perf_evlist, &m->pctx,
					 metric_no_merge,
					 m->has_constraint, metric_events,
					 evlist_used);
		if (!evsel) {
			pr_debug("Cannot resolve %s: %s\n",
					m->metric_name, m->metric_expr);
			free(metric_events);
			continue;
		}
		for (i = 0; metric_events[i]; i++)
			metric_events[i]->collect_stat = true;
		me = metricgroup__lookup(metric_events_list, evsel, true);
		if (!me) {
			ret = -ENOMEM;
			free(metric_events);
			break;
		}
		expr = malloc(sizeof(struct metric_expr));
		if (!expr) {
			ret = -ENOMEM;
			free(metric_events);
			break;
		}

		/*
		 * Collect and store collected nested expressions
		 * for metric processing.
		 */
		if (m->metric_refs_cnt) {
			struct metric_ref_node *ref;

			metric_refs = zalloc(sizeof(struct metric_ref) * (m->metric_refs_cnt + 1));
			if (!metric_refs) {
				ret = -ENOMEM;
				free(metric_events);
				free(expr);
				break;
			}

			i = 0;
			list_for_each_entry(ref, &m->metric_refs, list) {
				/*
				 * Intentionally passing just const char pointers,
				 * originally from 'struct pmu_event' object.
				 * We don't need to change them, so there's no
				 * need to create our own copy.
				 */
				metric_refs[i].metric_name = ref->metric_name;
				metric_refs[i].metric_expr = ref->metric_expr;
				i++;
			}
		}

		expr->metric_refs = metric_refs;
		expr->metric_expr = m->metric_expr;
		expr->metric_name = m->metric_name;
		expr->metric_unit = m->metric_unit;
		expr->metric_events = metric_events;
		expr->runtime = m->runtime;
		list_add(&expr->nd, &me->head);
	}

	evlist__for_each_entry_safe(perf_evlist, tmp, evsel) {
		if (!test_bit(evsel->core.idx, evlist_used)) {
			evlist__remove(perf_evlist, evsel);
			evsel__delete(evsel);
		}
	}
	bitmap_free(evlist_used);

	return ret;
}

static bool match_metric(const char *n, const char *list)
{
	int len;
	char *m;

	if (!list)
		return false;
	if (!strcmp(list, "all"))
		return true;
	if (!n)
		return !strcasecmp(list, "No_group");
	len = strlen(list);
	m = strcasestr(n, list);
	if (!m)
		return false;
	if ((m == n || m[-1] == ';' || m[-1] == ' ') &&
	    (m[len] == 0 || m[len] == ';'))
		return true;
	return false;
}

static bool match_pe_metric(struct pmu_event *pe, const char *metric)
{
	return match_metric(pe->metric_group, metric) ||
	       match_metric(pe->metric_name, metric);
}

struct mep {
	struct rb_node nd;
	const char *name;
	struct strlist *metrics;
};

static int mep_cmp(struct rb_node *rb_node, const void *entry)
{
	struct mep *a = container_of(rb_node, struct mep, nd);
	struct mep *b = (struct mep *)entry;

	return strcmp(a->name, b->name);
}

static struct rb_node *mep_new(struct rblist *rl __maybe_unused,
					const void *entry)
{
	struct mep *me = malloc(sizeof(struct mep));

	if (!me)
		return NULL;
	memcpy(me, entry, sizeof(struct mep));
	me->name = strdup(me->name);
	if (!me->name)
		goto out_me;
	me->metrics = strlist__new(NULL, NULL);
	if (!me->metrics)
		goto out_name;
	return &me->nd;
out_name:
	zfree(&me->name);
out_me:
	free(me);
	return NULL;
}

static struct mep *mep_lookup(struct rblist *groups, const char *name)
{
	struct rb_node *nd;
	struct mep me = {
		.name = name
	};
	nd = rblist__find(groups, &me);
	if (nd)
		return container_of(nd, struct mep, nd);
	rblist__add_node(groups, &me);
	nd = rblist__find(groups, &me);
	if (nd)
		return container_of(nd, struct mep, nd);
	return NULL;
}

static void mep_delete(struct rblist *rl __maybe_unused,
		       struct rb_node *nd)
{
	struct mep *me = container_of(nd, struct mep, nd);

	strlist__delete(me->metrics);
	zfree(&me->name);
	free(me);
}

static void metricgroup__print_strlist(struct strlist *metrics, bool raw)
{
	struct str_node *sn;
	int n = 0;

	strlist__for_each_entry (sn, metrics) {
		if (raw)
			printf("%s%s", n > 0 ? " " : "", sn->s);
		else
			printf("  %s\n", sn->s);
		n++;
	}
	if (raw)
		putchar('\n');
}

static int metricgroup__print_pmu_event(struct pmu_event *pe,
					bool metricgroups, char *filter,
					bool raw, bool details,
					struct rblist *groups,
					struct strlist *metriclist)
{
	const char *g;
	char *omg, *mg;

	g = pe->metric_group;
	if (!g && pe->metric_name) {
		if (pe->name)
			return 0;
		g = "No_group";
	}

	if (!g)
		return 0;

	mg = strdup(g);

	if (!mg)
		return -ENOMEM;
	omg = mg;
	while ((g = strsep(&mg, ";")) != NULL) {
		struct mep *me;
		char *s;

		g = skip_spaces(g);
		if (*g == 0)
			g = "No_group";
		if (filter && !strstr(g, filter))
			continue;
		if (raw)
			s = (char *)pe->metric_name;
		else {
			if (asprintf(&s, "%s\n%*s%s]",
				     pe->metric_name, 8, "[", pe->desc) < 0)
				return -1;
			if (details) {
				if (asprintf(&s, "%s\n%*s%s]",
					     s, 8, "[", pe->metric_expr) < 0)
					return -1;
			}
		}

		if (!s)
			continue;

		if (!metricgroups) {
			strlist__add(metriclist, s);
		} else {
			me = mep_lookup(groups, g);
			if (!me)
				continue;
			strlist__add(me->metrics, s);
		}

		if (!raw)
			free(s);
	}
	free(omg);

	return 0;
}

struct metricgroup_print_sys_idata {
	struct strlist *metriclist;
	char *filter;
	struct rblist *groups;
	bool metricgroups;
	bool raw;
	bool details;
};

typedef int (*metricgroup_sys_event_iter_fn)(struct pmu_event *pe, void *);

struct metricgroup_iter_data {
	metricgroup_sys_event_iter_fn fn;
	void *data;
};

static int metricgroup__sys_event_iter(struct pmu_event *pe, void *data)
{
	struct metricgroup_iter_data *d = data;
	struct perf_pmu *pmu = NULL;

	if (!pe->metric_expr || !pe->compat)
		return 0;

	while ((pmu = perf_pmu__scan(pmu))) {

		if (!pmu->id || strcmp(pmu->id, pe->compat))
			continue;

		return d->fn(pe, d->data);
	}

	return 0;
}

static int metricgroup__print_sys_event_iter(struct pmu_event *pe, void *data)
{
	struct metricgroup_print_sys_idata *d = data;

	return metricgroup__print_pmu_event(pe, d->metricgroups, d->filter, d->raw,
				     d->details, d->groups, d->metriclist);
}

void metricgroup__print(bool metrics, bool metricgroups, char *filter,
			bool raw, bool details)
{
	struct pmu_events_map *map = pmu_events_map__find();
	struct pmu_event *pe;
	int i;
	struct rblist groups;
	struct rb_node *node, *next;
	struct strlist *metriclist = NULL;

	if (!metricgroups) {
		metriclist = strlist__new(NULL, NULL);
		if (!metriclist)
			return;
	}

	rblist__init(&groups);
	groups.node_new = mep_new;
	groups.node_cmp = mep_cmp;
	groups.node_delete = mep_delete;
	for (i = 0; map; i++) {
		pe = &map->table[i];

		if (!pe->name && !pe->metric_group && !pe->metric_name)
			break;
		if (!pe->metric_expr)
			continue;
		if (metricgroup__print_pmu_event(pe, metricgroups, filter,
						 raw, details, &groups,
						 metriclist) < 0)
			return;
	}

	{
		struct metricgroup_iter_data data = {
			.fn = metricgroup__print_sys_event_iter,
			.data = (void *) &(struct metricgroup_print_sys_idata){
				.metriclist = metriclist,
				.metricgroups = metricgroups,
				.filter = filter,
				.raw = raw,
				.details = details,
				.groups = &groups,
			},
		};

		pmu_for_each_sys_event(metricgroup__sys_event_iter, &data);
	}

	if (!filter || !rblist__empty(&groups)) {
		if (metricgroups && !raw)
			printf("\nMetric Groups:\n\n");
		else if (metrics && !raw)
			printf("\nMetrics:\n\n");
	}

	for (node = rb_first_cached(&groups.entries); node; node = next) {
		struct mep *me = container_of(node, struct mep, nd);

		if (metricgroups)
			printf("%s%s%s", me->name, metrics && !raw ? ":" : "", raw ? " " : "\n");
		if (metrics)
			metricgroup__print_strlist(me->metrics, raw);
		next = rb_next(node);
		rblist__remove_node(&groups, node);
	}
	if (!metricgroups)
		metricgroup__print_strlist(metriclist, raw);
	strlist__delete(metriclist);
}

static void metricgroup__add_metric_weak_group(struct strbuf *events,
					       struct expr_parse_ctx *ctx)
{
	struct hashmap_entry *cur;
	size_t bkt;
	bool no_group = true, has_duration = false;

	hashmap__for_each_entry((&ctx->ids), cur, bkt) {
		pr_debug("found event %s\n", (const char *)cur->key);
		/*
		 * Duration time maps to a software event and can make
		 * groups not count. Always use it outside a
		 * group.
		 */
		if (!strcmp(cur->key, "duration_time")) {
			has_duration = true;
			continue;
		}
		strbuf_addf(events, "%s%s",
			no_group ? "{" : ",",
			(const char *)cur->key);
		no_group = false;
	}
	if (!no_group) {
		strbuf_addf(events, "}:W");
		if (has_duration)
			strbuf_addf(events, ",duration_time");
	} else if (has_duration)
		strbuf_addf(events, "duration_time");
}

static void metricgroup__add_metric_non_group(struct strbuf *events,
					      struct expr_parse_ctx *ctx)
{
	struct hashmap_entry *cur;
	size_t bkt;
	bool first = true;

	hashmap__for_each_entry((&ctx->ids), cur, bkt) {
		if (!first)
			strbuf_addf(events, ",");
		strbuf_addf(events, "%s", (const char *)cur->key);
		first = false;
	}
}

static void metricgroup___watchdog_constraint_hint(const char *name, bool foot)
{
	static bool violate_nmi_constraint;

	if (!foot) {
		pr_warning("Splitting metric group %s into standalone metrics.\n", name);
		violate_nmi_constraint = true;
		return;
	}

	if (!violate_nmi_constraint)
		return;

	pr_warning("Try disabling the NMI watchdog to comply NO_NMI_WATCHDOG metric constraint:\n"
		   "    echo 0 > /proc/sys/kernel/nmi_watchdog\n"
		   "    perf stat ...\n"
		   "    echo 1 > /proc/sys/kernel/nmi_watchdog\n");
}

static bool metricgroup__has_constraint(struct pmu_event *pe)
{
	if (!pe->metric_constraint)
		return false;

	if (!strcmp(pe->metric_constraint, "NO_NMI_WATCHDOG") &&
	    sysctl__nmi_watchdog_enabled()) {
		metricgroup___watchdog_constraint_hint(pe->metric_name, false);
		return true;
	}

	return false;
}

int __weak arch_get_runtimeparam(struct pmu_event *pe __maybe_unused)
{
	return 1;
}

struct metricgroup_add_iter_data {
	struct list_head *metric_list;
	const char *metric;
	struct expr_ids *ids;
	int *ret;
	bool *has_match;
	bool metric_no_group;
};

static int __add_metric(struct list_head *metric_list,
			struct pmu_event *pe,
			bool metric_no_group,
			int runtime,
			struct metric **mp,
			struct expr_id *parent,
			struct expr_ids *ids)
{
	struct metric_ref_node *ref;
	struct metric *m;

	if (*mp == NULL) {
		/*
		 * We got in here for the parent group,
		 * allocate it and put it on the list.
		 */
		m = zalloc(sizeof(*m));
		if (!m)
			return -ENOMEM;

		expr__ctx_init(&m->pctx);
		m->metric_name = pe->metric_name;
		m->metric_expr = pe->metric_expr;
		m->metric_unit = pe->unit;
		m->runtime = runtime;
		m->has_constraint = metric_no_group || metricgroup__has_constraint(pe);
		INIT_LIST_HEAD(&m->metric_refs);
		m->metric_refs_cnt = 0;

		parent = expr_ids__alloc(ids);
		if (!parent) {
			free(m);
			return -EINVAL;
		}

		parent->id = strdup(pe->metric_name);
		if (!parent->id) {
			free(m);
			return -ENOMEM;
		}
		*mp = m;
	} else {
		/*
		 * We got here for the referenced metric, via the
		 * recursive metricgroup__add_metric call, add
		 * it to the parent group.
		 */
		m = *mp;

		ref = malloc(sizeof(*ref));
		if (!ref)
			return -ENOMEM;

		/*
		 * Intentionally passing just const char pointers,
		 * from 'pe' object, so they never go away. We don't
		 * need to change them, so there's no need to create
		 * our own copy.
		 */
		ref->metric_name = pe->metric_name;
		ref->metric_expr = pe->metric_expr;

		list_add(&ref->list, &m->metric_refs);
		m->metric_refs_cnt++;
	}

	/* Force all found IDs in metric to have us as parent ID. */
	WARN_ON_ONCE(!parent);
	m->pctx.parent = parent;

	/*
	 * For both the parent and referenced metrics, we parse
	 * all the metric's IDs and add it to the parent context.
	 */
	if (expr__find_other(pe->metric_expr, NULL, &m->pctx, runtime) < 0) {
		if (m->metric_refs_cnt == 0) {
			expr__ctx_clear(&m->pctx);
			free(m);
			*mp = NULL;
		}
		return -EINVAL;
	}

	/*
	 * We add new group only in the 'parent' call,
	 * so bail out for referenced metric case.
	 */
	if (m->metric_refs_cnt)
		return 0;

	if (list_empty(metric_list))
		list_add(&m->nd, metric_list);
	else {
		struct list_head *pos;

		/* Place the largest groups at the front. */
		list_for_each_prev(pos, metric_list) {
			struct metric *old = list_entry(pos, struct metric, nd);

			if (hashmap__size(&m->pctx.ids) <=
			    hashmap__size(&old->pctx.ids))
				break;
		}
		list_add(&m->nd, pos);
	}

	return 0;
}

#define map_for_each_event(__pe, __idx, __map)					\
	if (__map)								\
		for (__idx = 0, __pe = &__map->table[__idx];			\
		     __pe->name || __pe->metric_group || __pe->metric_name;	\
		     __pe = &__map->table[++__idx])

#define map_for_each_metric(__pe, __idx, __map, __metric)		\
	map_for_each_event(__pe, __idx, __map)				\
		if (__pe->metric_expr &&				\
		    (match_metric(__pe->metric_group, __metric) ||	\
		     match_metric(__pe->metric_name, __metric)))

struct pmu_event *metricgroup__find_metric(const char *metric,
					   struct pmu_events_map *map)
{
	struct pmu_event *pe;
	int i;

	map_for_each_event(pe, i, map) {
		if (match_metric(pe->metric_name, metric))
			return pe;
	}

	return NULL;
}

static int recursion_check(struct metric *m, const char *id, struct expr_id **parent,
			   struct expr_ids *ids)
{
	struct expr_id_data *data;
	struct expr_id *p;
	int ret;

	/*
	 * We get the parent referenced by 'id' argument and
	 * traverse through all the parent object IDs to check
	 * if we already processed 'id', if we did, it's recursion
	 * and we fail.
	 */
	ret = expr__get_id(&m->pctx, id, &data);
	if (ret)
		return ret;

	p = expr_id_data__parent(data);

	while (p->parent) {
		if (!strcmp(p->id, id)) {
			pr_err("failed: recursion detected for %s\n", id);
			return -1;
		}
		p = p->parent;
	}

	/*
	 * If we are over the limit of static entris, the metric
	 * is too difficult/nested to process, fail as well.
	 */
	p = expr_ids__alloc(ids);
	if (!p) {
		pr_err("failed: too many nested metrics\n");
		return -EINVAL;
	}

	p->id     = strdup(id);
	p->parent = expr_id_data__parent(data);
	*parent   = p;

	return p->id ? 0 : -ENOMEM;
}

static int add_metric(struct list_head *metric_list,
		      struct pmu_event *pe,
		      bool metric_no_group,
		      struct metric **mp,
		      struct expr_id *parent,
		      struct expr_ids *ids);

static int __resolve_metric(struct metric *m,
			    bool metric_no_group,
			    struct list_head *metric_list,
			    struct pmu_events_map *map,
			    struct expr_ids *ids)
{
	struct hashmap_entry *cur;
	size_t bkt;
	bool all;
	int ret;

	/*
	 * Iterate all the parsed IDs and if there's metric,
	 * add it to the context.
	 */
	do {
		all = true;
		hashmap__for_each_entry((&m->pctx.ids), cur, bkt) {
			struct expr_id *parent;
			struct pmu_event *pe;

			pe = metricgroup__find_metric(cur->key, map);
			if (!pe)
				continue;

			ret = recursion_check(m, cur->key, &parent, ids);
			if (ret)
				return ret;

			all = false;
			/* The metric key itself needs to go out.. */
			expr__del_id(&m->pctx, cur->key);

			/* ... and it gets resolved to the parent context. */
			ret = add_metric(metric_list, pe, metric_no_group, &m, parent, ids);
			if (ret)
				return ret;

			/*
			 * We added new metric to hashmap, so we need
			 * to break the iteration and start over.
			 */
			break;
		}
	} while (!all);

	return 0;
}

static int resolve_metric(bool metric_no_group,
			  struct list_head *metric_list,
			  struct pmu_events_map *map,
			  struct expr_ids *ids)
{
	struct metric *m;
	int err;

	list_for_each_entry(m, metric_list, nd) {
		err = __resolve_metric(m, metric_no_group, metric_list, map, ids);
		if (err)
			return err;
	}
	return 0;
}

static int add_metric(struct list_head *metric_list,
		      struct pmu_event *pe,
		      bool metric_no_group,
		      struct metric **m,
		      struct expr_id *parent,
		      struct expr_ids *ids)
{
	struct metric *orig = *m;
	int ret = 0;

	pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);

	if (!strstr(pe->metric_expr, "?")) {
		ret = __add_metric(metric_list, pe, metric_no_group, 1, m, parent, ids);
	} else {
		int j, count;

		count = arch_get_runtimeparam(pe);

		/* This loop is added to create multiple
		 * events depend on count value and add
		 * those events to metric_list.
		 */

		for (j = 0; j < count && !ret; j++, *m = orig)
			ret = __add_metric(metric_list, pe, metric_no_group, j, m, parent, ids);
	}

	return ret;
}

static int metricgroup__add_metric_sys_event_iter(struct pmu_event *pe,
						  void *data)
{
	struct metricgroup_add_iter_data *d = data;
	struct metric *m = NULL;
	int ret;

	if (!match_pe_metric(pe, d->metric))
		return 0;

	ret = add_metric(d->metric_list, pe, d->metric_no_group, &m, NULL, d->ids);
	if (ret)
		goto out;

	ret = resolve_metric(d->metric_no_group,
				     d->metric_list, NULL, d->ids);
	if (ret)
		goto out;

	*(d->has_match) = true;

out:
	*(d->ret) = ret;
	return ret;
}

static int metricgroup__add_metric(const char *metric, bool metric_no_group,
				   struct strbuf *events,
				   struct list_head *metric_list,
				   struct pmu_events_map *map)
{
	struct expr_ids ids = { .cnt = 0, };
	struct pmu_event *pe;
	struct metric *m;
	LIST_HEAD(list);
	int i, ret;
	bool has_match = false;

	map_for_each_metric(pe, i, map, metric) {
		has_match = true;
		m = NULL;

		ret = add_metric(&list, pe, metric_no_group, &m, NULL, &ids);
		if (ret)
			goto out;

		/*
		 * Process any possible referenced metrics
		 * included in the expression.
		 */
		ret = resolve_metric(metric_no_group,
				     &list, map, &ids);
		if (ret)
			goto out;
	}

	{
		struct metricgroup_iter_data data = {
			.fn = metricgroup__add_metric_sys_event_iter,
			.data = (void *) &(struct metricgroup_add_iter_data) {
				.metric_list = &list,
				.metric = metric,
				.metric_no_group = metric_no_group,
				.ids = &ids,
				.has_match = &has_match,
				.ret = &ret,
			},
		};

		pmu_for_each_sys_event(metricgroup__sys_event_iter, &data);
	}
	/* End of pmu events. */
	if (!has_match) {
		ret = -EINVAL;
		goto out;
	}

	list_for_each_entry(m, &list, nd) {
		if (events->len > 0)
			strbuf_addf(events, ",");

		if (m->has_constraint) {
			metricgroup__add_metric_non_group(events,
							  &m->pctx);
		} else {
			metricgroup__add_metric_weak_group(events,
							   &m->pctx);
		}
	}

out:
	/*
	 * add to metric_list so that they can be released
	 * even if it's failed
	 */
	list_splice(&list, metric_list);
	expr_ids__exit(&ids);
	return ret;
}

static int metricgroup__add_metric_list(const char *list, bool metric_no_group,
					struct strbuf *events,
					struct list_head *metric_list,
					struct pmu_events_map *map)
{
	char *llist, *nlist, *p;
	int ret = -EINVAL;

	nlist = strdup(list);
	if (!nlist)
		return -ENOMEM;
	llist = nlist;

	strbuf_init(events, 100);
	strbuf_addf(events, "%s", "");

	while ((p = strsep(&llist, ",")) != NULL) {
		ret = metricgroup__add_metric(p, metric_no_group, events,
					      metric_list, map);
		if (ret == -EINVAL) {
			fprintf(stderr, "Cannot find metric or group `%s'\n",
					p);
			break;
		}
	}
	free(nlist);

	if (!ret)
		metricgroup___watchdog_constraint_hint(NULL, true);

	return ret;
}

static void metric__free_refs(struct metric *metric)
{
	struct metric_ref_node *ref, *tmp;

	list_for_each_entry_safe(ref, tmp, &metric->metric_refs, list) {
		list_del(&ref->list);
		free(ref);
	}
}

static void metricgroup__free_metrics(struct list_head *metric_list)
{
	struct metric *m, *tmp;

	list_for_each_entry_safe (m, tmp, metric_list, nd) {
		metric__free_refs(m);
		expr__ctx_clear(&m->pctx);
		list_del_init(&m->nd);
		free(m);
	}
}

static int parse_groups(struct evlist *perf_evlist, const char *str,
			bool metric_no_group,
			bool metric_no_merge,
			struct perf_pmu *fake_pmu,
			struct rblist *metric_events,
			struct pmu_events_map *map)
{
	struct parse_events_error parse_error;
	struct strbuf extra_events;
	LIST_HEAD(metric_list);
	int ret;

	if (metric_events->nr_entries == 0)
		metricgroup__rblist_init(metric_events);
	ret = metricgroup__add_metric_list(str, metric_no_group,
					   &extra_events, &metric_list, map);
	if (ret)
		goto out;
	pr_debug("adding %s\n", extra_events.buf);
	bzero(&parse_error, sizeof(parse_error));
	ret = __parse_events(perf_evlist, extra_events.buf, &parse_error, fake_pmu);
	if (ret) {
		parse_events_print_error(&parse_error, extra_events.buf);
		goto out;
	}
	ret = metricgroup__setup_events(&metric_list, metric_no_merge,
					perf_evlist, metric_events);
out:
	metricgroup__free_metrics(&metric_list);
	strbuf_release(&extra_events);
	return ret;
}

int metricgroup__parse_groups(const struct option *opt,
			      const char *str,
			      bool metric_no_group,
			      bool metric_no_merge,
			      struct rblist *metric_events)
{
	struct evlist *perf_evlist = *(struct evlist **)opt->value;
	struct pmu_events_map *map = pmu_events_map__find();

	return parse_groups(perf_evlist, str, metric_no_group,
			    metric_no_merge, NULL, metric_events, map);
}

int metricgroup__parse_groups_test(struct evlist *evlist,
				   struct pmu_events_map *map,
				   const char *str,
				   bool metric_no_group,
				   bool metric_no_merge,
				   struct rblist *metric_events)
{
	return parse_groups(evlist, str, metric_no_group,
			    metric_no_merge, &perf_pmu__fake, metric_events, map);
}

bool metricgroup__has_metric(const char *metric)
{
	struct pmu_events_map *map = pmu_events_map__find();
	struct pmu_event *pe;
	int i;

	if (!map)
		return false;

	for (i = 0; ; i++) {
		pe = &map->table[i];

		if (!pe->name && !pe->metric_group && !pe->metric_name)
			break;
		if (!pe->metric_expr)
			continue;
		if (match_metric(pe->metric_name, metric))
			return true;
	}
	return false;
}

int metricgroup__copy_metric_events(struct evlist *evlist, struct cgroup *cgrp,
				    struct rblist *new_metric_events,
				    struct rblist *old_metric_events)
{
	unsigned i;

	for (i = 0; i < rblist__nr_entries(old_metric_events); i++) {
		struct rb_node *nd;
		struct metric_event *old_me, *new_me;
		struct metric_expr *old_expr, *new_expr;
		struct evsel *evsel;
		size_t alloc_size;
		int idx, nr;

		nd = rblist__entry(old_metric_events, i);
		old_me = container_of(nd, struct metric_event, nd);

		evsel = evlist__find_evsel(evlist, old_me->evsel->core.idx);
		if (!evsel)
			return -EINVAL;
		new_me = metricgroup__lookup(new_metric_events, evsel, true);
		if (!new_me)
			return -ENOMEM;

		pr_debug("copying metric event for cgroup '%s': %s (idx=%d)\n",
			 cgrp ? cgrp->name : "root", evsel->name, evsel->core.idx);

		list_for_each_entry(old_expr, &old_me->head, nd) {
			new_expr = malloc(sizeof(*new_expr));
			if (!new_expr)
				return -ENOMEM;

			new_expr->metric_expr = old_expr->metric_expr;
			new_expr->metric_name = old_expr->metric_name;
			new_expr->metric_unit = old_expr->metric_unit;
			new_expr->runtime = old_expr->runtime;

			if (old_expr->metric_refs) {
				/* calculate number of metric_events */
				for (nr = 0; old_expr->metric_refs[nr].metric_name; nr++)
					continue;
				alloc_size = sizeof(*new_expr->metric_refs);
				new_expr->metric_refs = calloc(nr + 1, alloc_size);
				if (!new_expr->metric_refs) {
					free(new_expr);
					return -ENOMEM;
				}

				memcpy(new_expr->metric_refs, old_expr->metric_refs,
				       nr * alloc_size);
			} else {
				new_expr->metric_refs = NULL;
			}

			/* calculate number of metric_events */
			for (nr = 0; old_expr->metric_events[nr]; nr++)
				continue;
			alloc_size = sizeof(*new_expr->metric_events);
			new_expr->metric_events = calloc(nr + 1, alloc_size);
			if (!new_expr->metric_events) {
				free(new_expr->metric_refs);
				free(new_expr);
				return -ENOMEM;
			}

			/* copy evsel in the same position */
			for (idx = 0; idx < nr; idx++) {
				evsel = old_expr->metric_events[idx];
				evsel = evlist__find_evsel(evlist, evsel->core.idx);
				if (evsel == NULL) {
					free(new_expr->metric_events);
					free(new_expr->metric_refs);
					free(new_expr);
					return -EINVAL;
				}
				new_expr->metric_events[idx] = evsel;
			}

			list_add(&new_expr->nd, &new_me->head);
		}
	}
	return 0;
}