File: mpstat.c

package info (click to toggle)
sysstat 11.4.3-2
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 3,916 kB
  • ctags: 2,690
  • sloc: ansic: 25,138; sh: 1,094; tcl: 756; makefile: 559; perl: 257; python: 202
file content (1219 lines) | stat: -rw-r--r-- 34,022 bytes parent folder | download
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
/*
 * mpstat: per-processor statistics
 * (C) 2000-2016 by Sebastien GODARD (sysstat <at> orange.fr)
 *
 ***************************************************************************
 * This program is free software; you can redistribute it and/or modify it *
 * under the terms of the GNU General Public License as published  by  the *
 * Free Software Foundation; either version 2 of the License, or (at  your *
 * option) any later version.                                              *
 *                                                                         *
 * This program is distributed in the hope that it  will  be  useful,  but *
 * WITHOUT ANY WARRANTY; without the implied warranty  of  MERCHANTABILITY *
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
 * for more details.                                                       *
 *                                                                         *
 * You should have received a copy of the GNU General Public License along *
 * with this program; if not, write to the Free Software Foundation, Inc., *
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA              *
 ***************************************************************************
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <ctype.h>
#include <sys/utsname.h>

#include "version.h"
#include "mpstat.h"
#include "common.h"
#include "rd_stats.h"
#include "count.h"

#ifdef USE_NLS
#include <locale.h>
#include <libintl.h>
#define _(string) gettext(string)
#else
#define _(string) (string)
#endif

unsigned long long uptime[3] = {0, 0, 0};
unsigned long long uptime0[3] = {0, 0, 0};

/* NOTE: Use array of _char_ for bitmaps to avoid endianness problems...*/
unsigned char *cpu_bitmap;	/* Bit 0: Global; Bit 1: 1st proc; etc. */

/* Structure used to save CPU stats */
struct stats_cpu *st_cpu[3];
/*
 * Structure used to save total number of interrupts received
 * among all CPU and for each CPU.
 */
struct stats_irq *st_irq[3];
/*
 * Structures used to save, for each interrupt, the number
 * received by each CPU.
 */
struct stats_irqcpu *st_irqcpu[3];
struct stats_irqcpu *st_softirqcpu[3];

struct tm mp_tstamp[3];

/* Activity flag */
unsigned int actflags = 0;

unsigned int flags = 0;

/* Interval and count parameters */
long interval = -1, count = 0;

/* Nb of processors on the machine */
int cpu_nr = 0;
/* Nb of interrupts per processor */
int irqcpu_nr = 0;
/* Nb of soft interrupts per processor */
int softirqcpu_nr = 0;

struct sigaction alrm_act, int_act;
int sigint_caught = 0;

/*
 ***************************************************************************
 * Print usage and exit
 *
 * IN:
 * @progname	Name of sysstat command
 ***************************************************************************
 */
void usage(char *progname)
{
	fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ]\n"),
		progname);

	fprintf(stderr, _("Options are:\n"
			  "[ -A ] [ -u ] [ -V ] [ -I { SUM | CPU | SCPU | ALL } ]\n"
			  "[ -P { <cpu> [,...] | ON | ALL } ]\n"));
	exit(1);
}

/*
 ***************************************************************************
 * SIGALRM signal handler. No need to reset the handler here.
 *
 * IN:
 * @sig	Signal number.
 ***************************************************************************
 */
void alarm_handler(int sig)
{
	alarm(interval);
}

/*
 ***************************************************************************
 * SIGINT signal handler.
 *
 * IN:
 * @sig	Signal number.
 **************************************************************************
 */
void int_handler(int sig)
{
	sigint_caught = 1;
}

/*
 ***************************************************************************
 * Allocate stats structures and cpu bitmap.
 *
 * IN:
 * @nr_cpus	Number of CPUs. This is the real number of available CPUs + 1
 * 		because we also have to allocate a structure for CPU 'all'.
 ***************************************************************************
 */
void salloc_mp_struct(int nr_cpus)
{
	int i;

	for (i = 0; i < 3; i++) {

		if ((st_cpu[i] = (struct stats_cpu *) malloc(STATS_CPU_SIZE * nr_cpus))
		    == NULL) {
			perror("malloc");
			exit(4);
		}
		memset(st_cpu[i], 0, STATS_CPU_SIZE * nr_cpus);

		if ((st_irq[i] = (struct stats_irq *) malloc(STATS_IRQ_SIZE * nr_cpus))
		    == NULL) {
			perror("malloc");
			exit(4);
		}
		memset(st_irq[i], 0, STATS_IRQ_SIZE * nr_cpus);

		if ((st_irqcpu[i] = (struct stats_irqcpu *) malloc(STATS_IRQCPU_SIZE * nr_cpus * irqcpu_nr))
		    == NULL) {
			perror("malloc");
			exit(4);
		}
		memset(st_irqcpu[i], 0, STATS_IRQCPU_SIZE * nr_cpus * irqcpu_nr);

		if ((st_softirqcpu[i] = (struct stats_irqcpu *) malloc(STATS_IRQCPU_SIZE * nr_cpus * softirqcpu_nr))
		     == NULL) {
			perror("malloc");
			exit(4);
		}
		memset(st_softirqcpu[i], 0, STATS_IRQCPU_SIZE * nr_cpus * softirqcpu_nr);
	}

	if ((cpu_bitmap = (unsigned char *) malloc((nr_cpus >> 3) + 1)) == NULL) {
		perror("malloc");
		exit(4);
	}
	memset(cpu_bitmap, 0, (nr_cpus >> 3) + 1);
}

/*
 ***************************************************************************
 * Free structures and bitmap.
 ***************************************************************************
 */
void sfree_mp_struct(void)
{
	int i;

	for (i = 0; i < 3; i++) {
		free(st_cpu[i]);
		free(st_irq[i]);
		free(st_irqcpu[i]);
		free(st_softirqcpu[i]);
	}

	free(cpu_bitmap);
}

/*
 ***************************************************************************
 * Display CPU statistics.
 *
 * IN:
 * @dis		TRUE if a header line must be printed.
 * @g_itv	Interval value in jiffies multiplied by the number of CPU.
 * @prev	Position in array where statistics used	as reference are.
 *		Stats used as reference may be the previous ones read, or
 *		the very first ones when calculating the average.
 * @curr	Position in array where current statistics will be saved.
 * @prev_string	String displayed at the beginning of a header line. This is
 * 		the timestamp of the previous sample, or "Average" when
 * 		displaying average stats.
 * @curr_string	String displayed at the beginning of current sample stats.
 * 		This is the timestamp of the current sample, or "Average"
 * 		when displaying average stats.
 ***************************************************************************
 */
void write_cpu_stats(int dis, unsigned long long g_itv, int prev, int curr,
		     char *prev_string, char *curr_string)
{
	struct stats_cpu *scc, *scp;
	unsigned long long pc_itv;
	int cpu;

	if (dis) {
		printf("\n%-11s  CPU    %%usr   %%nice    %%sys %%iowait    %%irq   "
		       "%%soft  %%steal  %%guest  %%gnice   %%idle\n",
		       prev_string);
	}

	/* Check if we want global stats among all proc */
	if (*cpu_bitmap & 1) {

		printf("%-11s", curr_string);
		cprintf_in(IS_STR, " %s", " all", 0);

		cprintf_pc(10, 7, 2,
			   (st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest) <
			   (st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest) ?
			   0.0 :
			   ll_sp_value(st_cpu[prev]->cpu_user - st_cpu[prev]->cpu_guest,
				       st_cpu[curr]->cpu_user - st_cpu[curr]->cpu_guest,
				       g_itv),
			   (st_cpu[curr]->cpu_nice - st_cpu[curr]->cpu_guest_nice) <
			   (st_cpu[prev]->cpu_nice - st_cpu[prev]->cpu_guest_nice) ?
			   0.0 :
			   ll_sp_value(st_cpu[prev]->cpu_nice - st_cpu[prev]->cpu_guest_nice,
				       st_cpu[curr]->cpu_nice - st_cpu[curr]->cpu_guest_nice,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_sys,
				       st_cpu[curr]->cpu_sys,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_iowait,
				       st_cpu[curr]->cpu_iowait,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_hardirq,
				       st_cpu[curr]->cpu_hardirq,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_softirq,
				       st_cpu[curr]->cpu_softirq,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_steal,
				       st_cpu[curr]->cpu_steal,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_guest,
				       st_cpu[curr]->cpu_guest,
				       g_itv),
			   ll_sp_value(st_cpu[prev]->cpu_guest_nice,
				       st_cpu[curr]->cpu_guest_nice,
				       g_itv),
			   (st_cpu[curr]->cpu_idle < st_cpu[prev]->cpu_idle) ?
			   0.0 :
			   ll_sp_value(st_cpu[prev]->cpu_idle,
				       st_cpu[curr]->cpu_idle,
				       g_itv));
		printf("\n");
	}

	for (cpu = 1; cpu <= cpu_nr; cpu++) {

		scc = st_cpu[curr] + cpu;
		scp = st_cpu[prev] + cpu;

		/* Check if we want stats about this proc */
		if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
			continue;

		/*
		 * If the CPU is offline then it is omited from /proc/stat
		 * and the sum of all values is zero.
		 * (Remember that guest/guest_nice times are already included in
		 * user/nice modes.)
		 */
		if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
		     scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
		     scc->cpu_hardirq + scc->cpu_softirq) == 0) {

			if (!DISPLAY_ONLINE_CPU(flags)) {
				printf("%-11s", curr_string);
				cprintf_in(IS_INT, " %4d", "", cpu - 1);
				cprintf_pc(10, 7, 2,
					   0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
				printf("\n");
			}
			continue;
		}

		printf("%-11s", curr_string);
		cprintf_in(IS_INT, " %4d", "", cpu - 1);

		/* Recalculate itv for current proc */
		pc_itv = get_per_cpu_interval(scc, scp);

		if (!pc_itv) {
			/*
			 * If the CPU is tickless then there is no change in CPU values
			 * but the sum of values is not zero.
			 */
			cprintf_pc(10, 7, 2,
				   0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 100.0);
			printf("\n");
		}

		else {
			cprintf_pc(10, 7, 2,
				   (scc->cpu_user - scc->cpu_guest) < (scp->cpu_user - scp->cpu_guest) ?
				   0.0 :
				   ll_sp_value(scp->cpu_user - scp->cpu_guest,
					       scc->cpu_user - scc->cpu_guest,
					       pc_itv),
				   (scc->cpu_nice - scc->cpu_guest_nice) < (scp->cpu_nice - scp->cpu_guest_nice) ?
				   0.0 :
				   ll_sp_value(scp->cpu_nice - scp->cpu_guest_nice,
					       scc->cpu_nice - scc->cpu_guest_nice,
					       pc_itv),
				   ll_sp_value(scp->cpu_sys,
					       scc->cpu_sys,
					       pc_itv),
				   ll_sp_value(scp->cpu_iowait,
					       scc->cpu_iowait,
					       pc_itv),
				   ll_sp_value(scp->cpu_hardirq,
					       scc->cpu_hardirq,
					       pc_itv),
				   ll_sp_value(scp->cpu_softirq,
					       scc->cpu_softirq,
					       pc_itv),
				   ll_sp_value(scp->cpu_steal,
					       scc->cpu_steal,
					       pc_itv),
				   ll_sp_value(scp->cpu_guest,
					       scc->cpu_guest,
					       pc_itv),
				   ll_sp_value(scp->cpu_guest_nice,
					       scc->cpu_guest_nice,
					       pc_itv),
				   (scc->cpu_idle < scp->cpu_idle) ?
				   0.0 :
				   ll_sp_value(scp->cpu_idle,
					       scc->cpu_idle,
					       pc_itv));
			printf("\n");
		}
	}
}

/*
 ***************************************************************************
 * Display total number of interrupts per CPU.
 *
 * IN:
 * @dis		TRUE if a header line must be printed.
 * @itv		Interval value.
 * @prev	Position in array where statistics used	as reference are.
 *		Stats used as reference may be the previous ones read, or
 *		the very first ones when calculating the average.
 * @curr	Position in array where current statistics will be saved.
 * @prev_string	String displayed at the beginning of a header line. This is
 * 		the timestamp of the previous sample, or "Average" when
 * 		displaying average stats.
 * @curr_string	String displayed at the beginning of current sample stats.
 * 		This is the timestamp of the current sample, or "Average"
 * 		when displaying average stats.
 ***************************************************************************
 */
void write_isumcpu_stats(int dis, unsigned long long itv, int prev, int curr,
		     char *prev_string, char *curr_string)
{
	struct stats_cpu *scc, *scp;
	struct stats_irq *sic, *sip;
	unsigned long long pc_itv;
	int cpu;

	if (dis) {
		printf("\n%-11s  CPU    intr/s\n", prev_string);
		}

	if (*cpu_bitmap & 1) {
		printf("%-11s", curr_string);
		cprintf_in(IS_STR, " %s", " all", 0);
		/* Print total number of interrupts among all cpu */
		cprintf_f(1, 9, 2,
			  S_VALUE(st_irq[prev]->irq_nr, st_irq[curr]->irq_nr, itv));
		printf("\n");
	}

	for (cpu = 1; cpu <= cpu_nr; cpu++) {

		sic = st_irq[curr] + cpu;
		sip = st_irq[prev] + cpu;

		scc = st_cpu[curr] + cpu;
		scp = st_cpu[prev] + cpu;

		/* Check if we want stats about this CPU */
		if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))))
			continue;

		if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
		     scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
		     scc->cpu_hardirq + scc->cpu_softirq) == 0) {

			/* This is an offline CPU */

			if (!DISPLAY_ONLINE_CPU(flags)) {
				/*
				 * Display offline CPU if requested by the user.
				 * Value displayed is 0.00.
				 */
				printf("%-11s", curr_string);
				cprintf_in(IS_INT, " %4d", "", cpu- 1);
				cprintf_f(1, 9, 2, 0.0);
				printf("\n");
			}
			continue;
		}

		printf("%-11s", curr_string);
		cprintf_in(IS_INT, " %4d", "", cpu - 1);

		/* Recalculate itv for current proc */
		pc_itv = get_per_cpu_interval(scc, scp);

		if (!pc_itv) {
			/* This is a tickless CPU: Value displayed is 0.00 */
			cprintf_f(1, 9, 2, 0.0);
			printf("\n");
		}
		else {
			/* Display total number of interrupts for current CPU */
			cprintf_f(1, 9, 2,
				  S_VALUE(sip->irq_nr, sic->irq_nr, itv));
			printf("\n");
		}
	}
}

/*
 ***************************************************************************
 * Display interrupts statistics for each CPU.
 *
 * IN:
 * @st_ic	Array for per-CPU statistics.
 * @ic_nr	Number of interrupts (hard or soft) per CPU.
 * @dis		TRUE if a header line must be printed.
 * @itv		Interval value.
 * @prev	Position in array where statistics used	as reference are.
 *		Stats used as reference may be the previous ones read, or
 *		the very first ones when calculating the average.
 * @curr	Position in array where current statistics will be saved.
 * @prev_string	String displayed at the beginning of a header line. This is
 * 		the timestamp of the previous sample, or "Average" when
 * 		displaying average stats.
 * @curr_string	String displayed at the beginning of current sample stats.
 * 		This is the timestamp of the current sample, or "Average"
 * 		when displaying average stats.
 ***************************************************************************
 */
void write_irqcpu_stats(struct stats_irqcpu *st_ic[], int ic_nr, int dis,
			unsigned long long itv, int prev, int curr,
			char *prev_string, char *curr_string)
{
	struct stats_cpu *scc;
	int j = ic_nr, offset, cpu, colwidth[NR_IRQS];
	struct stats_irqcpu *p, *q, *p0, *q0;

	/*
	 * Check if number of interrupts has changed.
	 * If this is the case, the header line will be printed again.
	 * NB: A zero interval value indicates that we are
	 * displaying statistics since system startup.
	 */
	if (!dis && interval) {
		for (j = 0; j < ic_nr; j++) {
			p0 = st_ic[curr] + j;
			q0 = st_ic[prev] + j;
			if (strcmp(p0->irq_name, q0->irq_name))
				/*
				 * These are two different interrupts: The header must be displayed
				 * (maybe an interrupt has disappeared, or a new one has just been registered).
				 * Note that we compare even empty strings for the case where
				 * a disappearing interrupt would be the last one in the list.
				 */
				break;
		}
	}

	if (dis || (j < ic_nr)) {
		/* Print header */
		printf("\n%-11s  CPU", prev_string);
		for (j = 0; j < ic_nr; j++) {
			p0 = st_ic[curr] + j;
			if (p0->irq_name[0] == '\0')
				/* End of the list of interrupts */
				break;
			printf(" %8s/s", p0->irq_name);
		}
		printf("\n");
	}

	/* Calculate column widths */
	for (j = 0; j < ic_nr; j++) {
		p0 = st_ic[curr] + j;
		/*
		 * Width is IRQ name + 2 for the trailing "/s".
		 * Width is calculated even for "undefined" interrupts (with
		 * an empty irq_name string) to quiet code analysis tools.
		 */
		colwidth[j] = strlen(p0->irq_name) + 2;
		/*
		 * Normal space for printing a number is 11 chars
		 * (space + 10 digits including the period).
		 */
		if (colwidth[j] < 10) {
			colwidth[j] = 10;
		}
	}

	for (cpu = 1; cpu <= cpu_nr; cpu++) {

		scc = st_cpu[curr] + cpu;

		/*
		 * Check if we want stats about this CPU.
		 * CPU must have been explicitly selected using option -P,
		 * else we display every CPU.
		 */
		if (!(*(cpu_bitmap + (cpu >> 3)) & (1 << (cpu & 0x07))) && USE_P_OPTION(flags))
			continue;

		if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
		     scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
		     scc->cpu_hardirq + scc->cpu_softirq) == 0) {

			/* Offline CPU found */

			if (DISPLAY_ONLINE_CPU(flags))
				continue;
		}

		printf("%-11s", curr_string);
		cprintf_in(IS_INT, "  %3d", "", cpu - 1);

		for (j = 0; j < ic_nr; j++) {
			p0 = st_ic[curr] + j;	/* irq_name set only for CPU#0 */
			/*
			 * An empty string for irq_name means it is a remaining interrupt
			 * which is no longer used, for example because the
			 * number of interrupts has decreased in /proc/interrupts.
			 */
			if (p0->irq_name[0] == '\0')
				/* End of the list of interrupts */
				break;
			q0 = st_ic[prev] + j;
			offset = j;

			/*
			 * If we want stats for the time since system startup,
			 * we have p0->irq_name != q0->irq_name, since q0 structure
			 * is completely set to zero.
			 */
			if (strcmp(p0->irq_name, q0->irq_name) && interval) {
				/* Check if interrupt exists elsewhere in list */
				for (offset = 0; offset < ic_nr; offset++) {
					q0 = st_ic[prev] + offset;
					if (!strcmp(p0->irq_name, q0->irq_name))
						/* Interrupt found at another position */
						break;
				}
			}

			p = st_ic[curr] + (cpu - 1) * ic_nr + j;

			if (!strcmp(p0->irq_name, q0->irq_name) || !interval) {
				q = st_ic[prev] + (cpu - 1) * ic_nr + offset;
				cprintf_f(1, colwidth[j], 2,
					  S_VALUE(q->interrupt, p->interrupt, itv));
			}
			else {
				/*
				 * Instead of printing "N/A", assume that previous value
				 * for this new interrupt was zero.
				 */
				cprintf_f(1, colwidth[j], 2,
					  S_VALUE(0, p->interrupt, itv));
			}
		}
		printf("\n");
	}
}

/*
 ***************************************************************************
 * Core function used to display statistics.
 *
 * IN:
 * @prev	Position in array where statistics used	as reference are.
 *		Stats used as reference may be the previous ones read, or
 *		the very first ones when calculating the average.
 * @curr	Position in array where statistics for current sample are.
 * @dis		TRUE if a header line must be printed.
 * @prev_string	String displayed at the beginning of a header line. This is
 * 		the timestamp of the previous sample, or "Average" when
 * 		displaying average stats.
 * @curr_string	String displayed at the beginning of current sample stats.
 * 		This is the timestamp of the current sample, or "Average"
 * 		when displaying average stats.
 ***************************************************************************
 */
void write_stats_core(int prev, int curr, int dis,
		      char *prev_string, char *curr_string)
{
	struct stats_cpu *scc, *scp;
	unsigned long long itv, g_itv;
	int cpu;

	/* Test stdout */
	TEST_STDOUT(STDOUT_FILENO);

	/* Compute time interval */
	g_itv = get_interval(uptime[prev], uptime[curr]);

	/* Reduce interval value to one processor */
	if (cpu_nr > 1) {
		itv = get_interval(uptime0[prev], uptime0[curr]);
	}
	else {
		itv = g_itv;
	}

	/* Print CPU stats */
	if (DISPLAY_CPU(actflags)) {
		write_cpu_stats(dis, g_itv, prev, curr, prev_string, curr_string);
	}

	/* Print total number of interrupts per processor */
	if (DISPLAY_IRQ_SUM(actflags)) {
		write_isumcpu_stats(dis, itv, prev, curr, prev_string, curr_string);
	}

	/* Display each interrupt value for each CPU */
	if (DISPLAY_IRQ_CPU(actflags)) {
		write_irqcpu_stats(st_irqcpu, irqcpu_nr, dis, itv, prev, curr,
				   prev_string, curr_string);
	}
	if (DISPLAY_SOFTIRQS(actflags)) {
		write_irqcpu_stats(st_softirqcpu, softirqcpu_nr, dis, itv, prev, curr,
				   prev_string, curr_string);
	}

	/* Fix CPU counter values for every offline CPU */
	for (cpu = 1; cpu <= cpu_nr; cpu++) {

		scc = st_cpu[curr] + cpu;
		scp = st_cpu[prev] + cpu;

		if ((scc->cpu_user    + scc->cpu_nice + scc->cpu_sys   +
		     scc->cpu_iowait  + scc->cpu_idle + scc->cpu_steal +
		     scc->cpu_hardirq + scc->cpu_softirq) == 0) {
			/*
			 * Offline CPU found.
			 * Set current struct fields (which have been set to zero)
			 * to values from previous iteration. Hence their values won't
			 * jump from zero when the CPU comes back online.
			 */
			*scc = *scp;
		}
	}
}

/*
 ***************************************************************************
 * Print statistics average.
 *
 * IN:
 * @curr	Position in array where statistics for current sample are.
 * @dis		TRUE if a header line must be printed.
 ***************************************************************************
 */
void write_stats_avg(int curr, int dis)
{
	char string[16];

	strncpy(string, _("Average:"), 16);
	string[15] = '\0';
	write_stats_core(2, curr, dis, string, string);
}

/*
 ***************************************************************************
 * Print statistics.
 *
 * IN:
 * @curr	Position in array where statistics for current sample are.
 * @dis		TRUE if a header line must be printed.
 ***************************************************************************
 */
void write_stats(int curr, int dis)
{
	char cur_time[2][TIMESTAMP_LEN];

	/* Get previous timestamp */
	if (is_iso_time_fmt()) {
		strftime(cur_time[!curr], sizeof(cur_time[!curr]), "%H:%M:%S", &mp_tstamp[!curr]);
	}
	else {
		strftime(cur_time[!curr], sizeof(cur_time[!curr]), "%X", &(mp_tstamp[!curr]));
	}

	/* Get current timestamp */
	if (is_iso_time_fmt()) {
		strftime(cur_time[curr], sizeof(cur_time[curr]), "%H:%M:%S", &mp_tstamp[curr]);
	}
	else {
		strftime(cur_time[curr], sizeof(cur_time[curr]), "%X", &(mp_tstamp[curr]));
	}

	write_stats_core(!curr, curr, dis, cur_time[!curr], cur_time[curr]);
}

/*
 ***************************************************************************
 * Read stats from /proc/interrupts or /proc/softirqs.
 *
 * IN:
 * @file	/proc file to read (interrupts or softirqs).
 * @ic_nr	Number of interrupts (hard or soft) per CPU.
 * @curr	Position in array where current statistics will be saved.
 *
 * OUT:
 * @st_ic	Array for per-CPU interrupts statistics.
 ***************************************************************************
 */
void read_interrupts_stat(char *file, struct stats_irqcpu *st_ic[], int ic_nr, int curr)
{
	FILE *fp;
	struct stats_irq *st_irq_i;
	struct stats_irqcpu *p;
	char *line = NULL, *li;
	unsigned long irq = 0;
	unsigned int cpu;
	int cpu_index[cpu_nr], index = 0, len;
	char *cp, *next;

	/* Reset total number of interrupts received by each CPU */
	for (cpu = 0; cpu < cpu_nr; cpu++) {
		st_irq_i = st_irq[curr] + cpu + 1;
		st_irq_i->irq_nr = 0;
	}

	if ((fp = fopen(file, "r")) != NULL) {

		SREALLOC(line, char, INTERRUPTS_LINE + 11 * cpu_nr);

		/*
		 * Parse header line to see which CPUs are online
		 */
		while (fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) {
			next = line;
			while (((cp = strstr(next, "CPU")) != NULL) && (index < cpu_nr)) {
				cpu = strtol(cp + 3, &next, 10);
				cpu_index[index++] = cpu;
			}
			if (index)
				/* Header line found */
				break;
		}

		/* Parse each line of interrupts statistics data */
		while ((fgets(line, INTERRUPTS_LINE + 11 * cpu_nr, fp) != NULL) &&
		       (irq < ic_nr)) {

			/* Skip over "<irq>:" */
			if ((cp = strchr(line, ':')) == NULL)
				/* Chr ':' not found */
				continue;
			cp++;

			p = st_ic[curr] + irq;

			/* Remove possible heading spaces in interrupt's name... */
			li = line;
			while (*li == ' ')
				li++;

			len = strcspn(li, ":");
			if (len >= MAX_IRQ_LEN) {
				len = MAX_IRQ_LEN - 1;
			}
			/* ...then save its name */
			strncpy(p->irq_name, li, len);
			p->irq_name[len] = '\0';

			/* For each interrupt: Get number received by each CPU */
			for (cpu = 0; cpu < index; cpu++) {
				p = st_ic[curr] + cpu_index[cpu] * ic_nr + irq;
				st_irq_i = st_irq[curr] + cpu_index[cpu] + 1;
				/*
				 * No need to set (st_irqcpu + cpu * irqcpu_nr)->irq_name:
				 * This is the same as st_irqcpu->irq_name.
				 * Now save current interrupt value for current CPU (in stats_irqcpu structure)
				 * and total number of interrupts received by current CPU (in stats_irq structure).
				 */
				p->interrupt = strtoul(cp, &next, 10);
				st_irq_i->irq_nr += p->interrupt;
				cp = next;
			}
			irq++;
		}

		fclose(fp);

		free(line);
	}

	while (irq < ic_nr) {
		/* Nb of interrupts per processor has changed */
		p = st_ic[curr] + irq;
		p->irq_name[0] = '\0';	/* This value means this is a dummy interrupt */
		irq++;
	}
}

/*
 ***************************************************************************
 * Main loop: Read stats from the relevant sources, and display them.
 *
 * IN:
 * @dis_hdr	Set to TRUE if the header line must always be printed.
 * @rows	Number of rows of screen.
 ***************************************************************************
 */
void rw_mpstat_loop(int dis_hdr, int rows)
{
	struct stats_cpu *scc;
	int cpu;
	int curr = 1, dis = 1;
	unsigned long lines = rows;

	/* Dont buffer data if redirected to a pipe */
	setbuf(stdout, NULL);

	/* Read uptime and CPU stats */
	if (cpu_nr > 1) {
		/*
		 * Init uptime0. So if /proc/uptime cannot fill it,
		 * this will be done by /proc/stat.
		 */
		uptime0[0] = 0;
		read_uptime(&(uptime0[0]));
	}
	read_stat_cpu(st_cpu[0], cpu_nr + 1, &(uptime[0]), &(uptime0[0]));

	/*
	 * Read total number of interrupts received among all CPU.
	 * (this is the first value on the line "intr:" in the /proc/stat file).
	 */
	if (DISPLAY_IRQ_SUM(actflags)) {
		read_stat_irq(st_irq[0], 1);
	}

	/*
	 * Read number of interrupts received by each CPU, for each interrupt,
	 * and compute the total number of interrupts received by each CPU.
	 */
	if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
		/* Read this file to display int per CPU or total nr of int per CPU */
		read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, 0);
	}
	if (DISPLAY_SOFTIRQS(actflags)) {
		read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, 0);
	}

	if (!interval) {
		/* Display since boot time */
		mp_tstamp[1] = mp_tstamp[0];
		memset(st_cpu[1], 0, STATS_CPU_SIZE * (cpu_nr + 1));
		memset(st_irq[1], 0, STATS_IRQ_SIZE * (cpu_nr + 1));
		memset(st_irqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
		if (DISPLAY_SOFTIRQS(actflags)) {
			memset(st_softirqcpu[1], 0, STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
		}
		write_stats(0, DISP_HDR);
		exit(0);
	}

	/* Set a handler for SIGALRM */
	memset(&alrm_act, 0, sizeof(alrm_act));
	alrm_act.sa_handler = alarm_handler;
	sigaction(SIGALRM, &alrm_act, NULL);
	alarm(interval);

	/* Save the first stats collected. Will be used to compute the average */
	mp_tstamp[2] = mp_tstamp[0];
	uptime[2] = uptime[0];
	uptime0[2] = uptime0[0];
	memcpy(st_cpu[2], st_cpu[0], STATS_CPU_SIZE * (cpu_nr + 1));
	memcpy(st_irq[2], st_irq[0], STATS_IRQ_SIZE * (cpu_nr + 1));
	memcpy(st_irqcpu[2], st_irqcpu[0], STATS_IRQCPU_SIZE * (cpu_nr + 1) * irqcpu_nr);
	if (DISPLAY_SOFTIRQS(actflags)) {
		memcpy(st_softirqcpu[2], st_softirqcpu[0],
		       STATS_IRQCPU_SIZE * (cpu_nr + 1) * softirqcpu_nr);
	}

	/* Set a handler for SIGINT */
	memset(&int_act, 0, sizeof(int_act));
	int_act.sa_handler = int_handler;
	sigaction(SIGINT, &int_act, NULL);

	pause();

	if (sigint_caught)
		/* SIGINT signal caught during first interval: Exit immediately */
		return;

	do {
		/*
		 * Resetting the structure not needed since every fields will be set.
		 * Exceptions are per-CPU structures: Some of them may not be filled
		 * if corresponding processor is disabled (offline). We set them to zero
		 * to be able to distinguish between offline and tickless CPUs.
		 */
		for (cpu = 1; cpu <= cpu_nr; cpu++) {
			scc = st_cpu[curr] + cpu;
			memset(scc, 0, STATS_CPU_SIZE);
		}

		/* Get time */
		get_localtime(&(mp_tstamp[curr]), 0);

		/* Read uptime and CPU stats */
		if (cpu_nr > 1) {
			uptime0[curr] = 0;
			read_uptime(&(uptime0[curr]));
		}
		read_stat_cpu(st_cpu[curr], cpu_nr + 1, &(uptime[curr]), &(uptime0[curr]));

		/* Read total number of interrupts received among all CPU */
		if (DISPLAY_IRQ_SUM(actflags)) {
			read_stat_irq(st_irq[curr], 1);
		}

		/*
		 * Read number of interrupts received by each CPU, for each interrupt,
		 * and compute the total number of interrupts received by each CPU.
		 */
		if (DISPLAY_IRQ_SUM(actflags) || DISPLAY_IRQ_CPU(actflags)) {
			read_interrupts_stat(INTERRUPTS, st_irqcpu, irqcpu_nr, curr);
		}
		if (DISPLAY_SOFTIRQS(actflags)) {
			read_interrupts_stat(SOFTIRQS, st_softirqcpu, softirqcpu_nr, curr);
		}

		/* Write stats */
		if (!dis_hdr) {
			dis = lines / rows;
			if (dis) {
				lines %= rows;
			}
			lines++;
		}
		write_stats(curr, dis);

		if (count > 0) {
			count--;
		}

		if (count) {

			pause();

			if (sigint_caught) {
				/* SIGINT signal caught => Display average stats */
				count = 0;
				printf("\n");	/* Skip "^C" displayed on screen */
			}
			else {
				curr ^= 1;
			}
		}
	}
	while (count);

	/* Write stats average */
	write_stats_avg(curr, dis_hdr);
}

/*
 ***************************************************************************
 * Main entry to the program
 ***************************************************************************
 */
int main(int argc, char **argv)
{
	int opt = 0, i, actset = FALSE;
	struct utsname header;
	int dis_hdr = -1;
	int rows = 23;
	char *t;

#ifdef USE_NLS
	/* Init National Language Support */
	init_nls();
#endif

	/* Init color strings */
	init_colors();

	/* Get HZ */
	get_HZ();

	/* What is the highest processor number on this machine? */
	cpu_nr = get_cpu_nr(~0, TRUE);

	/* Calculate number of interrupts per processor */
	irqcpu_nr = get_irqcpu_nr(INTERRUPTS, NR_IRQS, cpu_nr) +
		    NR_IRQCPU_PREALLOC;
	/* Calculate number of soft interrupts per processor */
	softirqcpu_nr = get_irqcpu_nr(SOFTIRQS, NR_IRQS, cpu_nr) +
			NR_IRQCPU_PREALLOC;

	/*
	 * cpu_nr: a value of 2 means there are 2 processors (0 and 1).
	 * In this case, we have to allocate 3 structures: global, proc0 and proc1.
	 */
	salloc_mp_struct(cpu_nr + 1);

	while (++opt < argc) {

		if (!strcmp(argv[opt], "-I")) {
			if (argv[++opt]) {
				actset = TRUE;

				for (t = strtok(argv[opt], ","); t; t = strtok(NULL, ",")) {
					if (!strcmp(t, K_SUM)) {
						/* Display total number of interrupts per CPU */
						actflags |= M_D_IRQ_SUM;
					}
					else if (!strcmp(t, K_CPU)) {
						/* Display interrupts per CPU */
						actflags |= M_D_IRQ_CPU;
					}
					else if (!strcmp(t, K_SCPU)) {
						/* Display soft interrupts per CPU */
						actflags |= M_D_SOFTIRQS;
					}
					else if (!strcmp(t, K_ALL)) {
						actflags |= M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
					}
					else {
						usage(argv[0]);
					}
				}
			}
			else {
				usage(argv[0]);
			}
		}

		else if (!strcmp(argv[opt], "-P")) {
			/* '-P ALL' can be used on UP machines */
			if (argv[++opt]) {
				flags |= F_P_OPTION;
				dis_hdr++;

				for (t = strtok(argv[opt], ","); t; t = strtok(NULL, ",")) {
					if (!strcmp(t, K_ALL) || !strcmp(t, K_ON)) {
						if (cpu_nr) {
							dis_hdr = 9;
						}
						/*
						 * Set bit for every processor.
						 * Also indicate to display stats for CPU 'all'.
						 */
						memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
						if (!strcmp(t, K_ON)) {
							/* Display stats only for online CPU */
							flags |= F_P_ON;
						}
					}
					else {
						if (strspn(t, DIGITS) != strlen(t)) {
							usage(argv[0]);
						}
						i = atoi(t);	/* Get cpu number */
						if (i >= cpu_nr) {
							fprintf(stderr, _("Not that many processors!\n"));
							exit(1);
						}
						i++;
						*(cpu_bitmap + (i >> 3)) |= 1 << (i & 0x07);
					}
				}
			}
			else {
				usage(argv[0]);
			}
		}

		else if (!strncmp(argv[opt], "-", 1)) {
			for (i = 1; *(argv[opt] + i); i++) {

				switch (*(argv[opt] + i)) {

				case 'A':
					actflags |= M_D_CPU + M_D_IRQ_SUM + M_D_IRQ_CPU + M_D_SOFTIRQS;
					actset = TRUE;
					/* Select all processors */
					flags |= F_P_OPTION;
					memset(cpu_bitmap, 0xff, ((cpu_nr + 1) >> 3) + 1);
					break;

				case 'u':
					/* Display CPU */
					actflags |= M_D_CPU;
					break;

				case 'V':
					/* Print version number */
					print_version();
					break;

				default:
					usage(argv[0]);
				}
			}
		}

		else if (interval < 0) {
			/* Get interval */
			if (strspn(argv[opt], DIGITS) != strlen(argv[opt])) {
				usage(argv[0]);
			}
			interval = atol(argv[opt]);
			if (interval < 0) {
				usage(argv[0]);
			}
			count = -1;
		}

		else if (count <= 0) {
			/* Get count value */
			if ((strspn(argv[opt], DIGITS) != strlen(argv[opt])) ||
			    !interval) {
				usage(argv[0]);
			}
			count = atol(argv[opt]);
			if (count < 1) {
				usage(argv[0]);
			}
		}

		else {
			usage(argv[0]);
		}
	}

	/* Default: Display CPU */
	if (!actset) {
		actflags |= M_D_CPU;
	}

	if (count_bits(&actflags, sizeof(unsigned int)) > 1) {
		dis_hdr = 9;
	}

	if (!USE_P_OPTION(flags)) {
		/* Option -P not used: Set bit 0 (global stats among all proc) */
		*cpu_bitmap = 1;
	}
	if (dis_hdr < 0) {
		dis_hdr = 0;
	}
	if (!dis_hdr) {
		/* Get window size */
		rows = get_win_height();
	}
	if (interval < 0) {
		/* Interval not set => display stats since boot time */
		interval = 0;
	}

	/* Get time */
	get_localtime(&(mp_tstamp[0]), 0);

	/* Get system name, release number and hostname */
	uname(&header);
	print_gal_header(&(mp_tstamp[0]), header.sysname, header.release,
			 header.nodename, header.machine, get_cpu_nr(~0, FALSE));

	/* Main loop */
	rw_mpstat_loop(dis_hdr, rows);

	/* Free structures */
	sfree_mp_struct();

	return 0;
}