summaryrefslogtreecommitdiffstats
path: root/tools/perf/builtin-stat.c
blob: 63a3afc7f32b6d20bbdbe49d69ec1b37f0c71afc (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
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
/*
 * builtin-stat.c
 *
 * Builtin stat command: Give a precise performance counters summary
 * overview about any workload, CPU or specific PID.
 *
 * Sample output:

   $ perf stat ./hackbench 10

  Time: 0.118

  Performance counter stats for './hackbench 10':

       1708.761321 task-clock                #   11.037 CPUs utilized
            41,190 context-switches          #    0.024 M/sec
             6,735 CPU-migrations            #    0.004 M/sec
            17,318 page-faults               #    0.010 M/sec
     5,205,202,243 cycles                    #    3.046 GHz
     3,856,436,920 stalled-cycles-frontend   #   74.09% frontend cycles idle
     1,600,790,871 stalled-cycles-backend    #   30.75% backend  cycles idle
     2,603,501,247 instructions              #    0.50  insns per cycle
                                             #    1.48  stalled cycles per insn
       484,357,498 branches                  #  283.455 M/sec
         6,388,934 branch-misses             #    1.32% of all branches

        0.154822978  seconds time elapsed

 *
 * Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
 *
 * Improvements and fixes by:
 *
 *   Arjan van de Ven <arjan@linux.intel.com>
 *   Yanmin Zhang <yanmin.zhang@intel.com>
 *   Wu Fengguang <fengguang.wu@intel.com>
 *   Mike Galbraith <efault@gmx.de>
 *   Paul Mackerras <paulus@samba.org>
 *   Jaswinder Singh Rajput <jaswinder@kernel.org>
 *
 * Released under the GPL v2. (and only v2, not any later version)
 */

#include "perf.h"
#include "builtin.h"
#include "util/cgroup.h"
#include "util/util.h"
#include <subcmd/parse-options.h>
#include "util/parse-events.h"
#include "util/pmu.h"
#include "util/event.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/debug.h"
#include "util/drv_configs.h"
#include "util/color.h"
#include "util/stat.h"
#include "util/header.h"
#include "util/cpumap.h"
#include "util/thread.h"
#include "util/thread_map.h"
#include "util/counts.h"
#include "util/group.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/string2.h"
#include "util/metricgroup.h"
#include "util/top.h"
#include "asm/bug.h"

#include <linux/time64.h>
#include <api/fs/fs.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/prctl.h>
#include <inttypes.h>
#include <locale.h>
#include <math.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>

#include "sane_ctype.h"

#define DEFAULT_SEPARATOR	" "
#define FREEZE_ON_SMI_PATH	"devices/cpu/freeze_on_smi"

static void print_counters(struct timespec *ts, int argc, const char **argv);

/* Default events used for perf stat -T */
static const char *transaction_attrs = {
	"task-clock,"
	"{"
	"instructions,"
	"cycles,"
	"cpu/cycles-t/,"
	"cpu/tx-start/,"
	"cpu/el-start/,"
	"cpu/cycles-ct/"
	"}"
};

/* More limited version when the CPU does not have all events. */
static const char * transaction_limited_attrs = {
	"task-clock,"
	"{"
	"instructions,"
	"cycles,"
	"cpu/cycles-t/,"
	"cpu/tx-start/"
	"}"
};

static const char * topdown_attrs[] = {
	"topdown-total-slots",
	"topdown-slots-retired",
	"topdown-recovery-bubbles",
	"topdown-fetch-bubbles",
	"topdown-slots-issued",
	NULL,
};

static const char *smi_cost_attrs = {
	"{"
	"msr/aperf/,"
	"msr/smi/,"
	"cycles"
	"}"
};

static struct perf_evlist	*evsel_list;

static struct target target = {
	.uid	= UINT_MAX,
};

#define METRIC_ONLY_LEN 20

static volatile pid_t		child_pid			= -1;
static int			detailed_run			=  0;
static bool			transaction_run;
static bool			topdown_run			= false;
static bool			smi_cost			= false;
static bool			smi_reset			= false;
static int			big_num_opt			=  -1;
static bool			group				= false;
static const char		*pre_cmd			= NULL;
static const char		*post_cmd			= NULL;
static bool			sync_run			= false;
static bool			forever				= false;
static bool			force_metric_only		= false;
static struct timespec		ref_time;
static bool			append_file;
static bool			interval_count;
static const char		*output_name;
static int			output_fd;

struct perf_stat {
	bool			 record;
	struct perf_data	 data;
	struct perf_session	*session;
	u64			 bytes_written;
	struct perf_tool	 tool;
	bool			 maps_allocated;
	struct cpu_map		*cpus;
	struct thread_map	*threads;
	enum aggr_mode		 aggr_mode;
};

static struct perf_stat		perf_stat;
#define STAT_RECORD		perf_stat.record

static volatile int done = 0;

static struct perf_stat_config stat_config = {
	.aggr_mode		= AGGR_GLOBAL,
	.scale			= true,
	.unit_width		= 4, /* strlen("unit") */
	.run_count		= 1,
	.metric_only_len	= METRIC_ONLY_LEN,
	.walltime_nsecs_stats	= &walltime_nsecs_stats,
	.big_num		= true,
};

static inline void diff_timespec(struct timespec *r, struct timespec *a,
				 struct timespec *b)
{
	r->tv_sec = a->tv_sec - b->tv_sec;
	if (a->tv_nsec < b->tv_nsec) {
		r->tv_nsec = a->tv_nsec + NSEC_PER_SEC - b->tv_nsec;
		r->tv_sec--;
	} else {
		r->tv_nsec = a->tv_nsec - b->tv_nsec ;
	}
}

static void perf_stat__reset_stats(void)
{
	int i;

	perf_evlist__reset_stats(evsel_list);
	perf_stat__reset_shadow_stats();

	for (i = 0; i < stat_config.stats_num; i++)
		perf_stat__reset_shadow_per_stat(&stat_config.stats[i]);
}

static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
				     union perf_event *event,
				     struct perf_sample *sample __maybe_unused,
				     struct machine *machine __maybe_unused)
{
	if (perf_data__write(&perf_stat.data, event, event->header.size) < 0) {
		pr_err("failed to write perf data, error: %m\n");
		return -1;
	}

	perf_stat.bytes_written += event->header.size;
	return 0;
}

static int write_stat_round_event(u64 tm, u64 type)
{
	return perf_event__synthesize_stat_round(NULL, tm, type,
						 process_synthesized_event,
						 NULL);
}

#define WRITE_STAT_ROUND_EVENT(time, interval) \
	write_stat_round_event(time, PERF_STAT_ROUND_TYPE__ ## interval)

#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)

static int
perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
			     struct perf_counts_values *count)
{
	struct perf_sample_id *sid = SID(counter, cpu, thread);

	return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
					   process_synthesized_event, NULL);
}

/*
 * Read out the results of a single counter:
 * do not aggregate counts across CPUs in system-wide mode
 */
static int read_counter(struct perf_evsel *counter)
{
	int nthreads = thread_map__nr(evsel_list->threads);
	int ncpus, cpu, thread;

	if (target__has_cpu(&target) && !target__has_per_thread(&target))
		ncpus = perf_evsel__nr_cpus(counter);
	else
		ncpus = 1;

	if (!counter->supported)
		return -ENOENT;

	if (counter->system_wide)
		nthreads = 1;

	for (thread = 0; thread < nthreads; thread++) {
		for (cpu = 0; cpu < ncpus; cpu++) {
			struct perf_counts_values *count;

			count = perf_counts(counter->counts, cpu, thread);

			/*
			 * The leader's group read loads data into its group members
			 * (via perf_evsel__read_counter) and sets threir count->loaded.
			 */
			if (!count->loaded &&
			    perf_evsel__read_counter(counter, cpu, thread)) {
				counter->counts->scaled = -1;
				perf_counts(counter->counts, cpu, thread)->ena = 0;
				perf_counts(counter->counts, cpu, thread)->run = 0;
				return -1;
			}

			count->loaded = false;

			if (STAT_RECORD) {
				if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
					pr_err("failed to write stat event\n");
					return -1;
				}
			}

			if (verbose > 1) {
				fprintf(stat_config.output,
					"%s: %d: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
						perf_evsel__name(counter),
						cpu,
						count->val, count->ena, count->run);
			}
		}
	}

	return 0;
}

static void read_counters(void)
{
	struct perf_evsel *counter;
	int ret;

	evlist__for_each_entry(evsel_list, counter) {
		ret = read_counter(counter);
		if (ret)
			pr_debug("failed to read counter %s\n", counter->name);

		if (ret == 0 && perf_stat_process_counter(&stat_config, counter))
			pr_warning("failed to process counter %s\n", counter->name);
	}
}

static void process_interval(void)
{
	struct timespec ts, rs;

	read_counters();

	clock_gettime(CLOCK_MONOTONIC, &ts);
	diff_timespec(&rs, &ts, &ref_time);

	if (STAT_RECORD) {
		if (WRITE_STAT_ROUND_EVENT(rs.tv_sec * NSEC_PER_SEC + rs.tv_nsec, INTERVAL))
			pr_err("failed to write stat round event\n");
	}

	init_stats(&walltime_nsecs_stats);
	update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
	print_counters(&rs, 0, NULL);
}

static void enable_counters(void)
{
	if (stat_config.initial_delay)
		usleep(stat_config.initial_delay * USEC_PER_MSEC);

	/*
	 * We need to enable counters only if:
	 * - we don't have tracee (attaching to task or cpu)
	 * - we have initial delay configured
	 */
	if (!target__none(&target) || stat_config.initial_delay)
		perf_evlist__enable(evsel_list);
}

static void disable_counters(void)
{
	/*
	 * If we don't have tracee (attaching to task or cpu), counters may
	 * still be running. To get accurate group ratios, we must stop groups
	 * from counting before reading their constituent counters.
	 */
	if (!target__none(&target))
		perf_evlist__disable(evsel_list);
}

static volatile int workload_exec_errno;

/*
 * perf_evlist__prepare_workload will send a SIGUSR1
 * if the fork fails, since we asked by setting its
 * want_signal to true.
 */
static void workload_exec_failed_signal(int signo __maybe_unused, siginfo_t *info,
					void *ucontext __maybe_unused)
{
	workload_exec_errno = info->si_value.sival_int;
}

static bool perf_evsel__should_store_id(struct perf_evsel *counter)
{
	return STAT_RECORD || counter->attr.read_format & PERF_FORMAT_ID;
}

static bool is_target_alive(struct target *_target,
			    struct thread_map *threads)
{
	struct stat st;
	int i;

	if (!target__has_task(_target))
		return true;

	for (i = 0; i < threads->nr; i++) {
		char path[PATH_MAX];

		scnprintf(path, PATH_MAX, "%s/%d", procfs__mountpoint(),
			  threads->map[i].pid);

		if (!stat(path, &st))
			return true;
	}

	return false;
}

static int __run_perf_stat(int argc, const char **argv, int run_idx)
{
	int interval = stat_config.interval;
	int times = stat_config.times;
	int timeout = stat_config.timeout;
	char msg[BUFSIZ];
	unsigned long long t0, t1;
	struct perf_evsel *counter;
	struct timespec ts;
	size_t l;
	int status = 0;
	const bool forks = (argc > 0);
	bool is_pipe = STAT_RECORD ? perf_stat.data.is_pipe : false;
	struct perf_evsel_config_term *err_term;

	if (interval) {
		ts.tv_sec  = interval / USEC_PER_MSEC;
		ts.tv_nsec = (interval % USEC_PER_MSEC) * NSEC_PER_MSEC;
	} else if (timeout) {
		ts.tv_sec  = timeout / USEC_PER_MSEC;
		ts.tv_nsec = (timeout % USEC_PER_MSEC) * NSEC_PER_MSEC;
	} else {
		ts.tv_sec  = 1;
		ts.tv_nsec = 0;
	}

	if (forks) {
		if (perf_evlist__prepare_workload(evsel_list, &target, argv, is_pipe,
						  workload_exec_failed_signal) < 0) {
			perror("failed to prepare workload");
			return -1;
		}
		child_pid = evsel_list->workload.pid;
	}

	if (group)
		perf_evlist__set_leader(evsel_list);

	evlist__for_each_entry(evsel_list, counter) {
try_again:
		if (create_perf_stat_counter(counter, &stat_config, &target) < 0) {

			/* Weak group failed. Reset the group. */
			if ((errno == EINVAL || errno == EBADF) &&
			    counter->leader != counter &&
			    counter->weak_group) {
				counter = perf_evlist__reset_weak_group(evsel_list, counter);
				goto try_again;
			}

			/*
			 * PPC returns ENXIO for HW counters until 2.6.37
			 * (behavior changed with commit b0a873e).
			 */
			if (errno == EINVAL || errno == ENOSYS ||
			    errno == ENOENT || errno == EOPNOTSUPP ||
			    errno == ENXIO) {
				if (verbose > 0)
					ui__warning("%s event is not supported by the kernel.\n",
						    perf_evsel__name(counter));
				counter->supported = false;

				if ((counter->leader != counter) ||
				    !(counter->leader->nr_members > 1))
					continue;
			} else if (perf_evsel__fallback(counter, errno, msg, sizeof(msg))) {
                                if (verbose > 0)
                                        ui__warning("%s\n", msg);
                                goto try_again;
			} else if (target__has_per_thread(&target) &&
				   evsel_list->threads &&
				   evsel_list->threads->err_thread != -1) {
				/*
				 * For global --per-thread case, skip current
				 * error thread.
				 */
				if (!thread_map__remove(evsel_list->threads,
							evsel_list->threads->err_thread)) {
					evsel_list->threads->err_thread = -1;
					goto try_again;
				}
			}

			perf_evsel__open_strerror(counter, &target,
						  errno, msg, sizeof(msg));
			ui__error("%s\n", msg);

			if (child_pid != -1)
				kill(child_pid, SIGTERM);

			return -1;
		}
		counter->supported = true;

		l = strlen(counter->unit);
		if (l > stat_config.unit_width)
			stat_config.unit_width = l;

		if (perf_evsel__should_store_id(counter) &&
		    perf_evsel__store_ids(counter, evsel_list))
			return -1;
	}

	if (perf_evlist__apply_filters(evsel_list, &counter)) {
		pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
			counter->filter, perf_evsel__name(counter), errno,
			str_error_r(errno, msg, sizeof(msg)));
		return -1;
	}

	if (perf_evlist__apply_drv_configs(evsel_list, &counter, &err_term)) {
		pr_err("failed to set config \"%s\" on event %s with %d (%s)\n",
		      err_term->val.drv_cfg, perf_evsel__name(counter), errno,
		      str_error_r(errno, msg, sizeof(msg)));
		return -1;
	}

	if (STAT_RECORD) {
		int err, fd = perf_data__fd(&perf_stat.data);

		if (is_pipe) {
			err = perf_header__write_pipe(perf_data__fd(&perf_stat.data));
		} else {
			err = perf_session__write_header(perf_stat.session, evsel_list,
							 fd, false);
		}

		if (err < 0)
			return err;

		err = perf_stat_synthesize_config(&stat_config, NULL, evsel_list,
						  process_synthesized_event, is_pipe);
		if (err < 0)
			return err;
	}

	/*
	 * Enable counters and exec the command:
	 */
	t0 = rdclock();
	clock_gettime(CLOCK_MONOTONIC, &ref_time);

	if (forks) {
		perf_evlist__start_workload(evsel_list);
		enable_counters();

		if (interval || timeout) {
			while (!waitpid(child_pid, &status, WNOHANG)) {
				nanosleep(&ts, NULL);
				if (timeout)
					break;
				process_interval();
				if (interval_count && !(--times))
					break;
			}
		}
		if (child_pid != -1)
			wait4(child_pid, &status, 0, &stat_config.ru_data);

		if (workload_exec_errno) {
			const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
			pr_err("Workload failed: %s\n", emsg);
			return -1;
		}

		if (WIFSIGNALED(status))
			psignal(WTERMSIG(status), argv[0]);
	} else {
		enable_counters();
		while (!done) {
			nanosleep(&ts, NULL);
			if (!is_target_alive(&target, evsel_list->threads))
				break;
			if (timeout)
				break;
			if (interval) {
				process_interval();
				if (interval_count && !(--times))
					break;
			}
		}
	}

	disable_counters();

	t1 = rdclock();

	if (stat_config.walltime_run_table)
		stat_config.walltime_run[run_idx] = t1 - t0;

	update_stats(&walltime_nsecs_stats, t1 - t0);

	/*
	 * Closing a group leader splits the group, and as we only disable
	 * group leaders, results in remaining events becoming enabled. To
	 * avoid arbitrary skew, we must read all counters before closing any
	 * group leaders.
	 */
	read_counters();
	perf_evlist__close(evsel_list);

	return WEXITSTATUS(status);
}

static int run_perf_stat(int argc, const char **argv, int run_idx)
{
	int ret;

	if (pre_cmd) {
		ret = system(pre_cmd);
		if (ret)
			return ret;
	}

	if (sync_run)
		sync();

	ret = __run_perf_stat(argc, argv, run_idx);
	if (ret)
		return ret;

	if (post_cmd) {
		ret = system(post_cmd);
		if (ret)
			return ret;
	}

	return ret;
}

static void print_counters(struct timespec *ts, int argc, const char **argv)
{
	/* Do not print anything if we record to the pipe. */
	if (STAT_RECORD && perf_stat.data.is_pipe)
		return;

	perf_evlist__print_counters(evsel_list, &stat_config, &target,
				    ts, argc, argv);
}

static volatile int signr = -1;

static void skip_signal(int signo)
{
	if ((child_pid == -1) || stat_config.interval)
		done = 1;

	signr = signo;
	/*
	 * render child_pid harmless
	 * won't send SIGTERM to a random
	 * process in case of race condition
	 * and fast PID recycling
	 */
	child_pid = -1;
}

static void sig_atexit(void)
{
	sigset_t set, oset;

	/*
	 * avoid race condition with SIGCHLD handler
	 * in skip_signal() which is modifying child_pid
	 * goal is to avoid send SIGTERM to a random
	 * process
	 */
	sigemptyset(&set);
	sigaddset(&set, SIGCHLD);
	sigprocmask(SIG_BLOCK, &set, &oset);

	if (child_pid != -1)
		kill(child_pid, SIGTERM);

	sigprocmask(SIG_SETMASK, &oset, NULL);

	if (signr == -1)
		return;

	signal(signr, SIG_DFL);
	kill(getpid(), signr);
}

static int stat__set_big_num(const struct option *opt __maybe_unused,
			     const char *s __maybe_unused, int unset)
{
	big_num_opt = unset ? 0 : 1;
	return 0;
}

static int enable_metric_only(const struct option *opt __maybe_unused,
			      const char *s __maybe_unused, int unset)
{
	force_metric_only = true;
	stat_config.metric_only = !unset;
	return 0;
}

static int parse_metric_groups(const struct option *opt,
			       const char *str,
			       int unset __maybe_unused)
{
	return metricgroup__parse_groups(opt, str, &stat_config.metric_events);
}

static struct option stat_options[] = {
	OPT_BOOLEAN('T', "transaction", &transaction_run,
		    "hardware transaction statistics"),
	OPT_CALLBACK('e', "event", &evsel_list, "event",
		     "event selector. use 'perf list' to list available events",
		     parse_events_option),
	OPT_CALLBACK(0, "filter", &evsel_list, "filter",
		     "event filter", parse_filter),
	OPT_BOOLEAN('i', "no-inherit", &stat_config.no_inherit,
		    "child tasks do not inherit counters"),
	OPT_STRING('p', "pid", &target.pid, "pid",
		   "stat events on existing process id"),
	OPT_STRING('t', "tid", &target.tid, "tid",
		   "stat events on existing thread id"),
	OPT_BOOLEAN('a', "all-cpus", &target.system_wide,
		    "system-wide collection from all CPUs"),
	OPT_BOOLEAN('g', "group", &group,
		    "put the counters into a counter group"),
	OPT_BOOLEAN('c', "scale", &stat_config.scale, "scale/normalize counters"),
	OPT_INCR('v', "verbose", &verbose,
		    "be more verbose (show counter open errors, etc)"),
	OPT_INTEGER('r', "repeat", &stat_config.run_count,
		    "repeat command and print average + stddev (max: 100, forever: 0)"),
	OPT_BOOLEAN(0, "table", &stat_config.walltime_run_table,
		    "display details about each run (only with -r option)"),
	OPT_BOOLEAN('n', "null", &stat_config.null_run,
		    "null run - dont start any counters"),
	OPT_INCR('d', "detailed", &detailed_run,
		    "detailed run - start a lot of events"),
	OPT_BOOLEAN('S', "sync", &sync_run,
		    "call sync() before starting a run"),
	OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
			   "print large numbers with thousands\' separators",
			   stat__set_big_num),
	OPT_STRING('C', "cpu", &target.cpu_list, "cpu",
		    "list of cpus to monitor in system-wide"),
	OPT_SET_UINT('A', "no-aggr", &stat_config.aggr_mode,
		    "disable CPU count aggregation", AGGR_NONE),
	OPT_BOOLEAN(0, "no-merge", &stat_config.no_merge, "Do not merge identical named events"),
	OPT_STRING('x', "field-separator", &stat_config.csv_sep, "separator",
		   "print counts with custom separator"),
	OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
		     "monitor event in cgroup name only", parse_cgroups),
	OPT_STRING('o', "output", &output_name, "file", "output file name"),
	OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
	OPT_INTEGER(0, "log-fd", &output_fd,
		    "log output to fd, instead of stderr"),
	OPT_STRING(0, "pre", &pre_cmd, "command",
			"command to run prior to the measured command"),
	OPT_STRING(0, "post", &post_cmd, "command",
			"command to run after to the measured command"),
	OPT_UINTEGER('I', "interval-print", &stat_config.interval,
		    "print counts at regular interval in ms "
		    "(overhead is possible for values <= 100ms)"),
	OPT_INTEGER(0, "interval-count", &stat_config.times,
		    "print counts for fixed number of times"),
	OPT_BOOLEAN(0, "interval-clear", &stat_config.interval_clear,
		    "clear screen in between new interval"),
	OPT_UINTEGER(0, "timeout", &stat_config.timeout,
		    "stop workload and print counts after a timeout period in ms (>= 10ms)"),
	OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
		     "aggregate counts per processor socket", AGGR_SOCKET),
	OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode,
		     "aggregate counts per physical processor core", AGGR_CORE),
	OPT_SET_UINT(0, "per-thread", &stat_config.aggr_mode,
		     "aggregate counts per thread", AGGR_THREAD),
	OPT_UINTEGER('D', "delay", &stat_config.initial_delay,
		     "ms to wait before starting measurement after program start"),
	OPT_CALLBACK_NOOPT(0, "metric-only", &stat_config.metric_only, NULL,
			"Only print computed metrics. No raw values", enable_metric_only),
	OPT_BOOLEAN(0, "topdown", &topdown_run,
			"measure topdown level 1 statistics"),
	OPT_BOOLEAN(0, "smi-cost", &smi_cost,
			"measure SMI cost"),
	OPT_CALLBACK('M', "metrics", &evsel_list, "metric/metric group list",
		     "monitor specified metrics or metric groups (separated by ,)",
		     parse_metric_groups),
	OPT_END()
};

static int perf_stat__get_socket(struct perf_stat_config *config __maybe_unused,
				 struct cpu_map *map, int cpu)
{
	return cpu_map__get_socket(map, cpu, NULL);
}

static int perf_stat__get_core(struct perf_stat_config *config __maybe_unused,
			       struct cpu_map *map, int cpu)
{
	return cpu_map__get_core(map, cpu, NULL);
}

static int cpu_map__get_max(struct cpu_map *map)
{
	int i, max = -1;

	for (i = 0; i < map->nr; i++) {
		if (map->map[i] > max)
			max = map->map[i];
	}

	return max;
}

static int perf_stat__get_aggr(struct perf_stat_config *config,
			       aggr_get_id_t get_id, struct cpu_map *map, int idx)
{
	int cpu;

	if (idx >= map->nr)
		return -1;

	cpu = map->map[idx];

	if (config->cpus_aggr_map->map[cpu] == -1)
		config->cpus_aggr_map->map[cpu] = get_id(config, map, idx);

	return config->cpus_aggr_map->map[cpu];
}

static int perf_stat__get_socket_cached(struct perf_stat_config *config,
					struct cpu_map *map, int idx)
{
	return perf_stat__get_aggr(config, perf_stat__get_socket, map, idx);
}

static int perf_stat__get_core_cached(struct perf_stat_config *config,
				      struct cpu_map *map, int idx)
{
	return perf_stat__get_aggr(config, perf_stat__get_core, map, idx);
}

static int perf_stat_init_aggr_mode(void)
{
	int nr;

	switch (stat_config.aggr_mode) {
	case AGGR_SOCKET:
		if (cpu_map__build_socket_map(evsel_list->cpus, &stat_config.aggr_map)) {
			perror("cannot build socket map");
			return -1;
		}
		stat_config.aggr_get_id = perf_stat__get_socket_cached;
		break;
	case AGGR_CORE:
		if (cpu_map__build_core_map(evsel_list->cpus, &stat_config.aggr_map)) {
			perror("cannot build core map");
			return -1;
		}
		stat_config.aggr_get_id = perf_stat__get_core_cached;
		break;
	case AGGR_NONE:
	case AGGR_GLOBAL:
	case AGGR_THREAD:
	case AGGR_UNSET:
	default:
		break;
	}

	/*
	 * The evsel_list->cpus is the base we operate on,
	 * taking the highest cpu number to be the size of
	 * the aggregation translate cpumap.
	 */
	nr = cpu_map__get_max(evsel_list->cpus);
	stat_config.cpus_aggr_map = cpu_map__empty_new(nr + 1);
	return stat_config.cpus_aggr_map ? 0 : -ENOMEM;
}

static void perf_stat__exit_aggr_mode(void)
{
	cpu_map__put(stat_config.aggr_map);
	cpu_map__put(stat_config.cpus_aggr_map);
	stat_config.aggr_map = NULL;
	stat_config.cpus_aggr_map = NULL;
}

static inline int perf_env__get_cpu(struct perf_env *env, struct cpu_map *map, int idx)
{
	int cpu;

	if (idx > map->nr)
		return -1;

	cpu = map->map[idx];

	if (cpu >= env->nr_cpus_avail)
		return -1;

	return cpu;
}

static int perf_env__get_socket(struct cpu_map *map, int idx, void *data)
{
	struct perf_env *env = data;
	int cpu = perf_env__get_cpu(env, map, idx);

	return cpu == -1 ? -1 : env->cpu[cpu].socket_id;
}

static int perf_env__get_core(struct cpu_map *map, int idx, void *data)
{
	struct perf_env *env = data;
	int core = -1, cpu = perf_env__get_cpu(env, map, idx);

	if (cpu != -1) {
		int socket_id = env->cpu[cpu].socket_id;

		/*
		 * Encode socket in upper 16 bits
		 * core_id is relative to socket, and
		 * we need a global id. So we combine
		 * socket + core id.
		 */
		core = (socket_id << 16) | (env->cpu[cpu].core_id & 0xffff);
	}

	return core;
}

static int perf_env__build_socket_map(struct perf_env *env, struct cpu_map *cpus,
				      struct cpu_map **sockp)
{
	return cpu_map__build_map(cpus, sockp, perf_env__get_socket, env);
}

static int perf_env__build_core_map(struct perf_env *env, struct cpu_map *cpus,
				    struct cpu_map **corep)
{
	return cpu_map__build_map(cpus, corep, perf_env__get_core, env);
}

static int perf_stat__get_socket_file(struct perf_stat_config *config __maybe_unused,
				      struct cpu_map *map, int idx)
{
	return perf_env__get_socket(map, idx, &perf_stat.session->header.env);
}

static int perf_stat__get_core_file(struct perf_stat_config *config __maybe_unused,
				    struct cpu_map *map, int idx)
{
	return perf_env__get_core(map, idx, &perf_stat.session->header.env);
}

static int perf_stat_init_aggr_mode_file(struct perf_stat *st)
{
	struct perf_env *env = &st->session->header.env;

	switch (stat_config.aggr_mode) {
	case AGGR_SOCKET:
		if (perf_env__build_socket_map(env, evsel_list->cpus, &stat_config.aggr_map)) {
			perror("cannot build socket map");
			return -1;
		}
		stat_config.aggr_get_id = perf_stat__get_socket_file;
		break;
	case AGGR_CORE:
		if (perf_env__build_core_map(env, evsel_list->cpus, &stat_config.aggr_map)) {
			perror("cannot build core map");
			return -1;
		}
		stat_config.aggr_get_id = perf_stat__get_core_file;
		break;
	case AGGR_NONE:
	case AGGR_GLOBAL:
	case AGGR_THREAD:
	case AGGR_UNSET:
	default:
		break;
	}

	return 0;
}

static int topdown_filter_events(const char **attr, char **str, bool use_group)
{
	int off = 0;
	int i;
	int len = 0;
	char *s;

	for (i = 0; attr[i]; i++) {
		if (pmu_have_event("cpu", attr[i])) {
			len += strlen(attr[i]) + 1;
			attr[i - off] = attr[i];
		} else
			off++;
	}
	attr[i - off] = NULL;

	*str = malloc(len + 1 + 2);
	if (!*str)
		return -1;
	s = *str;
	if (i - off == 0) {
		*s = 0;
		return 0;
	}
	if (use_group)
		*s++ = '{';
	for (i = 0; attr[i]; i++) {
		strcpy(s, attr[i]);
		s += strlen(s);
		*s++ = ',';
	}
	if (use_group) {
		s[-1] = '}';
		*s = 0;
	} else
		s[-1] = 0;
	return 0;
}

__weak bool arch_topdown_check_group(bool *warn)
{
	*warn = false;
	return false;
}

__weak void arch_topdown_group_warn(void)
{
}

/*
 * Add default attributes, if there were no attributes specified or
 * if -d/--detailed, -d -d or -d -d -d is used:
 */
static int add_default_attributes(void)
{
	int err;
	struct perf_event_attr default_attrs0[] = {

  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK		},
  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES	},
  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS		},
  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS		},

  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES		},
};
	struct perf_event_attr frontend_attrs[] = {
  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND	},
};
	struct perf_event_attr backend_attrs[] = {
  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND	},
};
	struct perf_event_attr default_attrs1[] = {
  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS		},
  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS	},
  { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES		},

};

/*
 * Detailed stats (-d), covering the L1 and last level data caches:
 */
	struct perf_event_attr detailed_attrs[] = {

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_L1D		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_ACCESS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_L1D		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_LL			<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_ACCESS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_LL			<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},
};

/*
 * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:
 */
	struct perf_event_attr very_detailed_attrs[] = {

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_L1I		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_ACCESS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_L1I		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_DTLB		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_ACCESS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_DTLB		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_ITLB		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_ACCESS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_ITLB		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_READ		<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},

};

/*
 * Very, very detailed stats (-d -d -d), adding prefetch events:
 */
	struct perf_event_attr very_very_detailed_attrs[] = {

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_L1D		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_PREFETCH	<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_ACCESS	<< 16)				},

  { .type = PERF_TYPE_HW_CACHE,
    .config =
	 PERF_COUNT_HW_CACHE_L1D		<<  0  |
	(PERF_COUNT_HW_CACHE_OP_PREFETCH	<<  8) |
	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},
};
	struct parse_events_error errinfo;

	/* Set attrs if no event is selected and !null_run: */
	if (stat_config.null_run)
		return 0;

	if (transaction_run) {
		/* Handle -T as -M transaction. Once platform specific metrics
		 * support has been added to the json files, all archictures
		 * will use this approach. To determine transaction support
		 * on an architecture test for such a metric name.
		 */
		if (metricgroup__has_metric("transaction")) {
			struct option opt = { .value = &evsel_list };

			return metricgroup__parse_groups(&opt, "transaction",
							 &stat_config.metric_events);
		}

		if (pmu_have_event("cpu", "cycles-ct") &&
		    pmu_have_event("cpu", "el-start"))
			err = parse_events(evsel_list, transaction_attrs,
					   &errinfo);
		else
			err = parse_events(evsel_list,
					   transaction_limited_attrs,
					   &errinfo);
		if (err) {
			fprintf(stderr, "Cannot set up transaction events\n");
			parse_events_print_error(&errinfo, transaction_attrs);
			return -1;
		}
		return 0;
	}

	if (smi_cost) {
		int smi;

		if (sysfs__read_int(FREEZE_ON_SMI_PATH, &smi) < 0) {
			fprintf(stderr, "freeze_on_smi is not supported.\n");
			return -1;
		}

		if (!smi) {
			if (sysfs__write_int(FREEZE_ON_SMI_PATH, 1) < 0) {
				fprintf(stderr, "Failed to set freeze_on_smi.\n");
				return -1;
			}
			smi_reset = true;
		}

		if (pmu_have_event("msr", "aperf") &&
		    pmu_have_event("msr", "smi")) {
			if (!force_metric_only)
				stat_config.metric_only = true;
			err = parse_events(evsel_list, smi_cost_attrs, &errinfo);
		} else {
			fprintf(stderr, "To measure SMI cost, it needs "
				"msr/aperf/, msr/smi/ and cpu/cycles/ support\n");
			parse_events_print_error(&errinfo, smi_cost_attrs);
			return -1;
		}
		if (err) {
			fprintf(stderr, "Cannot set up SMI cost events\n");
			return -1;
		}
		return 0;
	}

	if (topdown_run) {
		char *str = NULL;
		bool warn = false;

		if (stat_config.aggr_mode != AGGR_GLOBAL &&
		    stat_config.aggr_mode != AGGR_CORE) {
			pr_err("top down event configuration requires --per-core mode\n");
			return -1;
		}
		stat_config.aggr_mode = AGGR_CORE;
		if (nr_cgroups || !target__has_cpu(&target)) {
			pr_err("top down event configuration requires system-wide mode (-a)\n");
			return -1;
		}

		if (!force_metric_only)
			stat_config.metric_only = true;
		if (topdown_filter_events(topdown_attrs, &str,
				arch_topdown_check_group(&warn)) < 0) {
			pr_err("Out of memory\n");
			return -1;
		}
		if (topdown_attrs[0] && str) {
			if (warn)
				arch_topdown_group_warn();
			err = parse_events(evsel_list, str, &errinfo);
			if (err) {
				fprintf(stderr,
					"Cannot set up top down events %s: %d\n",
					str, err);
				free(str);
				parse_events_print_error(&errinfo, str);
				return -1;
			}
		} else {
			fprintf(stderr, "System does not support topdown\n");
			return -1;
		}
		free(str);
	}

	if (!evsel_list->nr_entries) {
		if (target__has_cpu(&target))
			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;

		if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0)
			return -1;
		if (pmu_have_event("cpu", "stalled-cycles-frontend")) {
			if (perf_evlist__add_default_attrs(evsel_list,
						frontend_attrs) < 0)
				return -1;
		}
		if (pmu_have_event("cpu", "stalled-cycles-backend")) {
			if (perf_evlist__add_default_attrs(evsel_list,
						backend_attrs) < 0)
				return -1;
		}
		if (perf_evlist__add_default_attrs(evsel_list, default_attrs1) < 0)
			return -1;
	}

	/* Detailed events get appended to the event list: */

	if (detailed_run <  1)
		return 0;

	/* Append detailed run extra attributes: */
	if (perf_evlist__add_default_attrs(evsel_list, detailed_attrs) < 0)
		return -1;

	if (detailed_run < 2)
		return 0;

	/* Append very detailed run extra attributes: */
	if (perf_evlist__add_default_attrs(evsel_list, very_detailed_attrs) < 0)
		return -1;

	if (detailed_run < 3)
		return 0;

	/* Append very, very detailed run extra attributes: */
	return perf_evlist__add_default_attrs(evsel_list, very_very_detailed_attrs);
}

static const char * const stat_record_usage[] = {
	"perf stat record [<options>]",
	NULL,
};

static void init_features(struct perf_session *session)
{
	int feat;

	for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
		perf_header__set_feat(&session->header, feat);

	perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
	perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
	perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
	perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
}

static int __cmd_record(int argc, const char **argv)
{
	struct perf_session *session;
	struct perf_data *data = &perf_stat.data;

	argc = parse_options(argc, argv, stat_options, stat_record_usage,
			     PARSE_OPT_STOP_AT_NON_OPTION);

	if (output_name)
		data->file.path = output_name;

	if (stat_config.run_count != 1 || forever) {
		pr_err("Cannot use -r option with perf stat record.\n");
		return -1;
	}

	session = perf_session__new(data, false, NULL);
	if (session == NULL) {
		pr_err("Perf session creation failed.\n");
		return -1;
	}

	init_features(session);

	session->evlist   = evsel_list;
	perf_stat.session = session;
	perf_stat.record  = true;
	return argc;
}

static int process_stat_round_event(struct perf_session *session,
				    union perf_event *event)
{
	struct stat_round_event *stat_round = &event->stat_round;
	struct perf_evsel *counter;
	struct timespec tsh, *ts = NULL;
	const char **argv = session->header.env.cmdline_argv;
	int argc = session->header.env.nr_cmdline;

	evlist__for_each_entry(evsel_list, counter)
		perf_stat_process_counter(&stat_config, counter);

	if (stat_round->type == PERF_STAT_ROUND_TYPE__FINAL)
		update_stats(&walltime_nsecs_stats, stat_round->time);

	if (stat_config.interval && stat_round->time) {
		tsh.tv_sec  = stat_round->time / NSEC_PER_SEC;
		tsh.tv_nsec = stat_round->time % NSEC_PER_SEC;
		ts = &tsh;
	}

	print_counters(ts, argc, argv);
	return 0;
}

static
int process_stat_config_event(struct perf_session *session,
			      union perf_event *event)
{
	struct perf_tool *tool = session->tool;
	struct perf_stat *st = container_of(tool, struct perf_stat, tool);

	perf_event__read_stat_config(&stat_config, &event->stat_config);

	if (cpu_map__empty(st->cpus)) {
		if (st->aggr_mode != AGGR_UNSET)
			pr_warning("warning: processing task data, aggregation mode not set\n");
		return 0;
	}

	if (st->aggr_mode != AGGR_UNSET)
		stat_config.aggr_mode = st->aggr_mode;

	if (perf_stat.data.is_pipe)
		perf_stat_init_aggr_mode();
	else
		perf_stat_init_aggr_mode_file(st);

	return 0;
}

static int set_maps(struct perf_stat *st)
{
	if (!st->cpus || !st->threads)
		return 0;

	if (WARN_ONCE(st->maps_allocated, "stats double allocation\n"))
		return -EINVAL;

	perf_evlist__set_maps(evsel_list, st->cpus, st->threads);

	if (perf_evlist__alloc_stats(evsel_list, true))
		return -ENOMEM;

	st->maps_allocated = true;
	return 0;
}

static
int process_thread_map_event(struct perf_session *session,
			     union perf_event *event)
{
	struct perf_tool *tool = session->tool;
	struct perf_stat *st = container_of(tool, struct perf_stat, tool);

	if (st->threads) {
		pr_warning("Extra thread map event, ignoring.\n");
		return 0;
	}

	st->threads = thread_map__new_event(&event->thread_map);
	if (!st->threads)
		return -ENOMEM;

	return set_maps(st);
}

static
int process_cpu_map_event(struct perf_session *session,
			  union perf_event *event)
{
	struct perf_tool *tool = session->tool;
	struct perf_stat *st = container_of(tool, struct perf_stat, tool);
	struct cpu_map *cpus;

	if (st->cpus) {
		pr_warning("Extra cpu map event, ignoring.\n");
		return 0;
	}

	cpus = cpu_map__new_data(&event->cpu_map.data);
	if (!cpus)
		return -ENOMEM;

	st->cpus = cpus;
	return set_maps(st);
}

static int runtime_stat_new(struct perf_stat_config *config, int nthreads)
{
	int i;

	config->stats = calloc(nthreads, sizeof(struct runtime_stat));
	if (!config->stats)
		return -1;

	config->stats_num = nthreads;

	for (i = 0; i < nthreads; i++)
		runtime_stat__init(&config->stats[i]);

	return 0;
}

static void runtime_stat_delete(struct perf_stat_config *config)
{
	int i;

	if (!config->stats)
		return;

	for (i = 0; i < config->stats_num; i++)
		runtime_stat__exit(&config->stats[i]);

	free(config->stats);
}

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

static struct perf_stat perf_stat = {
	.tool = {
		.attr		= perf_event__process_attr,
		.event_update	= perf_event__process_event_update,
		.thread_map	= process_thread_map_event,
		.cpu_map	= process_cpu_map_event,
		.stat_config	= process_stat_config_event,
		.stat		= perf_event__process_stat_event,
		.stat_round	= process_stat_round_event,
	},
	.aggr_mode = AGGR_UNSET,
};

static int __cmd_report(int argc, const char **argv)
{
	struct perf_session *session;
	const struct option options[] = {
	OPT_STRING('i', "input", &input_name, "file", "input file name"),
	OPT_SET_UINT(0, "per-socket", &perf_stat.aggr_mode,
		     "aggregate counts per processor socket", AGGR_SOCKET),
	OPT_SET_UINT(0, "per-core", &perf_stat.aggr_mode,
		     "aggregate counts per physical processor core", AGGR_CORE),
	OPT_SET_UINT('A', "no-aggr", &perf_stat.aggr_mode,
		     "disable CPU count aggregation", AGGR_NONE),
	OPT_END()
	};
	struct stat st;
	int ret;

	argc = parse_options(argc, argv, options, stat_report_usage, 0);

	if (!input_name || !strlen(input_name)) {
		if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
			input_name = "-";
		else
			input_name = "perf.data";
	}

	perf_stat.data.file.path = input_name;
	perf_stat.data.mode      = PERF_DATA_MODE_READ;

	session = perf_session__new(&perf_stat.data, false, &perf_stat.tool);
	if (session == NULL)
		return -1;

	perf_stat.session  = session;
	stat_config.output = stderr;
	evsel_list         = session->evlist;

	ret = perf_session__process_events(session);
	if (ret)
		return ret;

	perf_session__delete(session);
	return 0;
}

static void setup_system_wide(int forks)
{
	/*
	 * Make system wide (-a) the default target if
	 * no target was specified and one of following
	 * conditions is met:
	 *
	 *   - there's no workload specified
	 *   - there is workload specified but all requested
	 *     events are system wide events
	 */
	if (!target__none(&target))
		return;

	if (!forks)
		target.system_wide = true;
	else {
		struct perf_evsel *counter;

		evlist__for_each_entry(evsel_list, counter) {
			if (!counter->system_wide)
				return;
		}

		if (evsel_list->nr_entries)
			target.system_wide = true;
	}
}

int cmd_stat(int argc, const char **argv)
{
	const char * const stat_usage[] = {
		"perf stat [<options>] [<command>]",
		NULL
	};
	int status = -EINVAL, run_idx;
	const char *mode;
	FILE *output = stderr;
	unsigned int interval, timeout;
	const char * const stat_subcommands[] = { "record", "report" };

	setlocale(LC_ALL, "");

	evsel_list = perf_evlist__new();
	if (evsel_list == NULL)
		return -ENOMEM;

	parse_events__shrink_config_terms();

	/* String-parsing callback-based options would segfault when negated */
	set_option_flag(stat_options, 'e', "event", PARSE_OPT_NONEG);
	set_option_flag(stat_options, 'M', "metrics", PARSE_OPT_NONEG);
	set_option_flag(stat_options, 'G', "cgroup", PARSE_OPT_NONEG);

	argc = parse_options_subcommand(argc, argv, stat_options, stat_subcommands,
					(const char **) stat_usage,
					PARSE_OPT_STOP_AT_NON_OPTION);
	perf_stat__collect_metric_expr(evsel_list);
	perf_stat__init_shadow_stats();

	if (stat_config.csv_sep) {
		stat_config.csv_output = true;
		if (!strcmp(stat_config.csv_sep, "\\t"))
			stat_config.csv_sep = "\t";
	} else
		stat_config.csv_sep = DEFAULT_SEPARATOR;

	if (argc && !strncmp(argv[0], "rec", 3)) {
		argc = __cmd_record(argc, argv);
		if (argc < 0)
			return -1;
	} else if (argc && !strncmp(argv[0], "rep", 3))
		return __cmd_report(argc, argv);

	interval = stat_config.interval;
	timeout = stat_config.timeout;

	/*
	 * For record command the -o is already taken care of.
	 */
	if (!STAT_RECORD && output_name && strcmp(output_name, "-"))
		output = NULL;

	if (output_name && output_fd) {
		fprintf(stderr, "cannot use both --output and --log-fd\n");
		parse_options_usage(stat_usage, stat_options, "o", 1);
		parse_options_usage(NULL, stat_options, "log-fd", 0);
		goto out;
	}

	if (stat_config.metric_only && stat_config.aggr_mode == AGGR_THREAD) {
		fprintf(stderr, "--metric-only is not supported with --per-thread\n");
		goto out;
	}

	if (stat_config.metric_only && stat_config.run_count > 1) {
		fprintf(stderr, "--metric-only is not supported with -r\n");
		goto out;
	}

	if (stat_config.walltime_run_table && stat_config.run_count <= 1) {
		fprintf(stderr, "--table is only supported with -r\n");
		parse_options_usage(stat_usage, stat_options, "r", 1);
		parse_options_usage(NULL, stat_options, "table", 0);
		goto out;
	}

	if (output_fd < 0) {
		fprintf(stderr, "argument to --log-fd must be a > 0\n");
		parse_options_usage(stat_usage, stat_options, "log-fd", 0);
		goto out;
	}

	if (!output) {
		struct timespec tm;
		mode = append_file ? "a" : "w";

		output = fopen(output_name, mode);
		if (!output) {
			perror("failed to create output file");
			return -1;
		}
		clock_gettime(CLOCK_REALTIME, &tm);
		fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
	} else if (output_fd > 0) {
		mode = append_file ? "a" : "w";
		output = fdopen(output_fd, mode);
		if (!output) {
			perror("Failed opening logfd");
			return -errno;
		}
	}

	stat_config.output = output;

	/*
	 * let the spreadsheet do the pretty-printing
	 */
	if (stat_config.csv_output) {
		/* User explicitly passed -B? */
		if (big_num_opt == 1) {
			fprintf(stderr, "-B option not supported with -x\n");
			parse_options_usage(stat_usage, stat_options, "B", 1);
			parse_options_usage(NULL, stat_options, "x", 1);
			goto out;
		} else /* Nope, so disable big number formatting */
			stat_config.big_num = false;
	} else if (big_num_opt == 0) /* User passed --no-big-num */
		stat_config.big_num = false;

	setup_system_wide(argc);

	/*
	 * Display user/system times only for single
	 * run and when there's specified tracee.
	 */
	if ((stat_config.run_count == 1) && target__none(&target))
		stat_config.ru_display = true;

	if (stat_config.run_count < 0) {
		pr_err("Run count must be a positive number\n");
		parse_options_usage(stat_usage, stat_options, "r", 1);
		goto out;
	} else if (stat_config.run_count == 0) {
		forever = true;
		stat_config.run_count = 1;
	}

	if (stat_config.walltime_run_table) {
		stat_config.walltime_run = zalloc(stat_config.run_count * sizeof(stat_config.walltime_run[0]));
		if (!stat_config.walltime_run) {
			pr_err("failed to setup -r option");
			goto out;
		}
	}

	if ((stat_config.aggr_mode == AGGR_THREAD) &&
		!target__has_task(&target)) {
		if (!target.system_wide || target.cpu_list) {
			fprintf(stderr, "The --per-thread option is only "
				"available when monitoring via -p -t -a "
				"options or only --per-thread.\n");
			parse_options_usage(NULL, stat_options, "p", 1);
			parse_options_usage(NULL, stat_options, "t", 1);
			goto out;
		}
	}

	/*
	 * no_aggr, cgroup are for system-wide only
	 * --per-thread is aggregated per thread, we dont mix it with cpu mode
	 */
	if (((stat_config.aggr_mode != AGGR_GLOBAL &&
	      stat_config.aggr_mode != AGGR_THREAD) || nr_cgroups) &&
	    !target__has_cpu(&target)) {
		fprintf(stderr, "both cgroup and no-aggregation "
			"modes only available in system-wide mode\n");

		parse_options_usage(stat_usage, stat_options, "G", 1);
		parse_options_usage(NULL, stat_options, "A", 1);
		parse_options_usage(NULL, stat_options, "a", 1);
		goto out;
	}

	if (add_default_attributes())
		goto out;

	target__validate(&target);

	if ((stat_config.aggr_mode == AGGR_THREAD) && (target.system_wide))
		target.per_thread = true;

	if (perf_evlist__create_maps(evsel_list, &target) < 0) {
		if (target__has_task(&target)) {
			pr_err("Problems finding threads of monitor\n");
			parse_options_usage(stat_usage, stat_options, "p", 1);
			parse_options_usage(NULL, stat_options, "t", 1);
		} else if (target__has_cpu(&target)) {
			perror("failed to parse CPUs map");
			parse_options_usage(stat_usage, stat_options, "C", 1);
			parse_options_usage(NULL, stat_options, "a", 1);
		}
		goto out;
	}

	/*
	 * Initialize thread_map with comm names,
	 * so we could print it out on output.
	 */
	if (stat_config.aggr_mode == AGGR_THREAD) {
		thread_map__read_comms(evsel_list->threads);
		if (target.system_wide) {
			if (runtime_stat_new(&stat_config,
				thread_map__nr(evsel_list->threads))) {
				goto out;
			}
		}
	}

	if (stat_config.times && interval)
		interval_count = true;
	else if (stat_config.times && !interval) {
		pr_err("interval-count option should be used together with "
				"interval-print.\n");
		parse_options_usage(stat_usage, stat_options, "interval-count", 0);
		parse_options_usage(stat_usage, stat_options, "I", 1);
		goto out;
	}

	if (timeout && timeout < 100) {
		if (timeout < 10) {
			pr_err("timeout must be >= 10ms.\n");
			parse_options_usage(stat_usage, stat_options, "timeout", 0);
			goto out;
		} else
			pr_warning("timeout < 100ms. "
				   "The overhead percentage could be high in some cases. "
				   "Please proceed with caution.\n");
	}
	if (timeout && interval) {
		pr_err("timeout option is not supported with interval-print.\n");
		parse_options_usage(stat_usage, stat_options, "timeout", 0);
		parse_options_usage(stat_usage, stat_options, "I", 1);
		goto out;
	}

	if (perf_evlist__alloc_stats(evsel_list, interval))
		goto out;

	if (perf_stat_init_aggr_mode())
		goto out;

	/*
	 * Set sample_type to PERF_SAMPLE_IDENTIFIER, which should be harmless
	 * while avoiding that older tools show confusing messages.
	 *
	 * However for pipe sessions we need to keep it zero,
	 * because script's perf_evsel__check_attr is triggered
	 * by attr->sample_type != 0, and we can't run it on
	 * stat sessions.
	 */
	stat_config.identifier = !(STAT_RECORD && perf_stat.data.is_pipe);

	/*
	 * We dont want to block the signals - that would cause
	 * child tasks to inherit that and Ctrl-C would not work.
	 * What we want is for Ctrl-C to work in the exec()-ed
	 * task, but being ignored by perf stat itself:
	 */
	atexit(sig_atexit);
	if (!forever)
		signal(SIGINT,  skip_signal);
	signal(SIGCHLD, skip_signal);
	signal(SIGALRM, skip_signal);
	signal(SIGABRT, skip_signal);

	status = 0;
	for (run_idx = 0; forever || run_idx < stat_config.run_count; run_idx++) {
		if (stat_config.run_count != 1 && verbose > 0)
			fprintf(output, "[ perf stat: executing run #%d ... ]\n",
				run_idx + 1);

		status = run_perf_stat(argc, argv, run_idx);
		if (forever && status != -1) {
			print_counters(NULL, argc, argv);
			perf_stat__reset_stats();
		}
	}

	if (!forever && status != -1 && !interval)
		print_counters(NULL, argc, argv);

	if (STAT_RECORD) {
		/*
		 * We synthesize the kernel mmap record just so that older tools
		 * don't emit warnings about not being able to resolve symbols
		 * due to /proc/sys/kernel/kptr_restrict settings and instear provide
		 * a saner message about no samples being in the perf.data file.
		 *
		 * This also serves to suppress a warning about f_header.data.size == 0
		 * in header.c at the moment 'perf stat record' gets introduced, which
		 * is not really needed once we start adding the stat specific PERF_RECORD_
		 * records, but the need to suppress the kptr_restrict messages in older
		 * tools remain  -acme
		 */
		int fd = perf_data__fd(&perf_stat.data);
		int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
							     process_synthesized_event,
							     &perf_stat.session->machines.host);
		if (err) {
			pr_warning("Couldn't synthesize the kernel mmap record, harmless, "
				   "older tools may produce warnings about this file\n.");
		}

		if (!interval) {
			if (WRITE_STAT_ROUND_EVENT(walltime_nsecs_stats.max, FINAL))
				pr_err("failed to write stat round event\n");
		}

		if (!perf_stat.data.is_pipe) {
			perf_stat.session->header.data_size += perf_stat.bytes_written;
			perf_session__write_header(perf_stat.session, evsel_list, fd, true);
		}

		perf_session__delete(perf_stat.session);
	}

	perf_stat__exit_aggr_mode();
	perf_evlist__free_stats(evsel_list);
out:
	free(stat_config.walltime_run);

	if (smi_cost && smi_reset)
		sysfs__write_int(FREEZE_ON_SMI_PATH, 0);

	perf_evlist__delete(evsel_list);

	runtime_stat_delete(&stat_config);

	return status;
}