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
|
/*-
* Copyright (c) 2003-2005, Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/event.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ttycom.h>
#include <sys/wait.h>
#include <assert.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <math.h>
#include <pmc.h>
#include <pmclog.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include "pmcstat.h"
/*
* A given invocation of pmcstat(8) can manage multiple PMCs of both
* the system-wide and per-process variety. Each of these could be in
* 'counting mode' or in 'sampling mode'.
*
* For 'counting mode' PMCs, pmcstat(8) will periodically issue a
* pmc_read() at the configured time interval and print out the value
* of the requested PMCs.
*
* For 'sampling mode' PMCs it can log to a file for offline analysis,
* or can analyse sampling data "on the fly", either by converting
* samples to printed textual form or by creating gprof(1) compatible
* profiles, one per program executed. When creating gprof(1)
* profiles it can optionally merge entries from multiple processes
* for a given executable into a single profile file.
*/
/* Globals */
int pmcstat_interrupt = 0;
int pmcstat_displayheight = DEFAULT_DISPLAY_HEIGHT;
int pmcstat_pipefd[NPIPEFD];
int pmcstat_kq;
/*
* cleanup
*/
void
pmcstat_cleanup(struct pmcstat_args *a)
{
struct pmcstat_ev *ev, *tmp;
/* release allocated PMCs. */
STAILQ_FOREACH_SAFE(ev, &a->pa_head, ev_next, tmp)
if (ev->ev_pmcid != PMC_ID_INVALID) {
if (pmc_release(ev->ev_pmcid) < 0)
err(EX_OSERR, "ERROR: cannot release pmc "
"0x%x \"%s\"", ev->ev_pmcid, ev->ev_name);
free(ev->ev_name);
free(ev->ev_spec);
STAILQ_REMOVE(&a->pa_head, ev, pmcstat_ev, ev_next);
free(ev);
}
/* de-configure the log file if present. */
if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))
(void) pmc_configure_logfile(-1);
if (a->pa_logparser) {
pmclog_close(a->pa_logparser);
a->pa_logparser = NULL;
}
if (a->pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE))
pmcstat_shutdown_logging();
}
void
pmcstat_start_pmcs(struct pmcstat_args *a)
{
struct pmcstat_ev *ev;
STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
assert(ev->ev_pmcid != PMC_ID_INVALID);
if (pmc_start(ev->ev_pmcid) < 0) {
warn("ERROR: Cannot start pmc 0x%x \"%s\"",
ev->ev_pmcid, ev->ev_name);
pmcstat_cleanup(a);
exit(EX_OSERR);
}
}
}
void
pmcstat_print_headers(struct pmcstat_args *a)
{
struct pmcstat_ev *ev;
int c;
(void) fprintf(a->pa_printfile, PRINT_HEADER_PREFIX);
STAILQ_FOREACH(ev, &a->pa_head, ev_next) {
if (PMC_IS_SAMPLING_MODE(ev->ev_mode))
continue;
c = PMC_IS_SYSTEM_MODE(ev->ev_mode) ? 's' : 'p';
if (ev->ev_fieldskip != 0) {
(void) fprintf(a->pa_printfile, "%*s%c/%*s ",
ev->ev_fieldskip, "", c,
ev->ev_fieldwidth - ev->ev_fieldskip - 2,
ev->ev_name);
} else
(void) fprintf(a->pa_printfile, "%c/%*s ",
c, ev->ev_fieldwidth - 2, ev->ev_name);
}
(void) fflush(a->pa_printfile);
}
void
pmcstat_print_counters(struct pmcstat_args *a)
{
int extra_width;
struct pmcstat_ev *ev;
pmc_value_t value;
extra_width = sizeof(PRINT_HEADER_PREFIX) - 1;
STAILQ_FOREACH(ev, &a->pa_head, ev_next) {
/* skip sampling mode counters */
if (PMC_IS_SAMPLING_MODE(ev->ev_mode))
continue;
if (pmc_read(ev->ev_pmcid, &value) < 0)
err(EX_OSERR, "ERROR: Cannot read pmc "
"\"%s\"", ev->ev_name);
(void) fprintf(a->pa_printfile, "%*ju ",
ev->ev_fieldwidth + extra_width,
(uintmax_t) ev->ev_cumulative ? value :
(value - ev->ev_saved));
if (ev->ev_cumulative == 0)
ev->ev_saved = value;
extra_width = 0;
}
(void) fflush(a->pa_printfile);
}
/*
* Print output
*/
void
pmcstat_print_pmcs(struct pmcstat_args *a)
{
static int linecount = 0;
/* check if we need to print a header line */
if (++linecount > pmcstat_displayheight) {
(void) fprintf(a->pa_printfile, "\n");
linecount = 1;
}
if (linecount == 1)
pmcstat_print_headers(a);
(void) fprintf(a->pa_printfile, "\n");
pmcstat_print_counters(a);
return;
}
/*
* Do process profiling
*
* If a pid was specified, attach each allocated PMC to the target
* process. Otherwise, fork a child and attach the PMCs to the child,
* and have the child exec() the target program.
*/
void
pmcstat_setup_process(struct pmcstat_args *a)
{
char token;
struct pmcstat_ev *ev;
struct kevent kev;
if (a->pa_flags & FLAG_HAS_PID) {
STAILQ_FOREACH(ev, &a->pa_head, ev_next)
if (pmc_attach(ev->ev_pmcid, a->pa_pid) != 0)
err(EX_OSERR, "ERROR: cannot attach pmc \"%s\" to "
"process %d", ev->ev_name, (int) a->pa_pid);
} else {
/*
* We need to fork a new process and startup the child
* using execvp(). Before doing the exec() the child
* process reads its pipe for a token so that the parent
* can finish doing its pmc_attach() calls.
*/
if (pipe(pmcstat_pipefd) < 0)
err(EX_OSERR, "ERROR: cannot create pipe");
switch (a->pa_pid = fork()) {
case -1:
err(EX_OSERR, "ERROR: cannot fork");
/*NOTREACHED*/
case 0: /* child */
/* wait for our parent to signal us */
(void) close(pmcstat_pipefd[WRITEPIPEFD]);
if (read(pmcstat_pipefd[READPIPEFD], &token, 1) < 0)
err(EX_OSERR, "ERROR (child): cannot read "
"token");
(void) close(pmcstat_pipefd[READPIPEFD]);
/* exec() the program requested */
execvp(*a->pa_argv, a->pa_argv);
/* and if that fails, notify the parent */
kill(getppid(), SIGCHLD);
err(EX_OSERR, "ERROR: execvp \"%s\" failed",
*a->pa_argv);
/*NOTREACHED*/
default: /* parent */
(void) close(pmcstat_pipefd[READPIPEFD]);
/* attach all our PMCs to the child */
STAILQ_FOREACH(ev, &args.pa_head, ev_next)
if (PMC_IS_VIRTUAL_MODE(ev->ev_mode) &&
pmc_attach(ev->ev_pmcid, a->pa_pid) != 0)
err(EX_OSERR, "ERROR: cannot attach pmc "
"\"%s\" to process %d", ev->ev_name,
(int) a->pa_pid);
}
}
/* Ask to be notified via a kevent when the target process exits */
EV_SET(&kev, a->pa_pid, EVFILT_PROC, EV_ADD|EV_ONESHOT, NOTE_EXIT, 0,
NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: cannot monitor child process %d",
a->pa_pid);
return;
}
void
pmcstat_start_process(struct pmcstat_args *a)
{
/* nothing to do: target is already running */
if (a->pa_flags & FLAG_HAS_PID)
return;
/* write token to child to state that we are ready */
if (write(pmcstat_pipefd[WRITEPIPEFD], "+", 1) != 1)
err(EX_OSERR, "ERROR: write failed");
(void) close(pmcstat_pipefd[WRITEPIPEFD]);
}
void
pmcstat_show_usage(void)
{
errx(EX_USAGE,
"[options] [commandline]\n"
"\t Measure process and/or system performance using hardware\n"
"\t performance monitoring counters.\n"
"\t Options include:\n"
"\t -C\t\t (toggle) show cumulative counts\n"
"\t -D path\t create profiles in directory \"path\"\n"
"\t -E\t\t (toggle) show counts at process exit\n"
"\t -O file\t send log output to \"file\"\n"
"\t -P spec\t allocate a process-private sampling PMC\n"
"\t -R file\t read events from \"file\"\n"
"\t -S spec\t allocate a system-wide sampling PMC\n"
"\t -W\t\t (toggle) show counts per context switch\n"
"\t -c cpu\t\t set cpu for subsequent system-wide PMCs\n"
"\t -d\t\t (toggle) track descendants\n"
"\t -g\t\t produce gprof(1) compatible profiles\n"
"\t -k file\t set the path to the kernel\n"
"\t -n rate\t set sampling rate\n"
"\t -o file\t send print output to \"file\"\n"
"\t -p spec\t allocate a process-private counting PMC\n"
"\t -s spec\t allocate a system-wide counting PMC\n"
"\t -t pid\t\t attach to running process with pid \"pid\"\n"
"\t -w secs\t set printing time interval"
);
}
/*
* Main
*/
int
main(int argc, char **argv)
{
double interval;
int option, npmc, ncpu;
int c, current_cpu, current_sampling_count;
int do_print, do_descendants;
int do_logproccsw, do_logprocexit;
int pipefd[2];
int use_cumulative_counts;
pid_t pid;
char *end;
const char *errmsg;
enum pmcstat_state runstate;
struct pmcstat_ev *ev;
struct sigaction sa;
struct kevent kev;
struct winsize ws;
struct stat sb;
current_cpu = 0;
current_sampling_count = DEFAULT_SAMPLE_COUNT;
do_descendants = 0;
do_logproccsw = 0;
do_logprocexit = 0;
use_cumulative_counts = 0;
args.pa_required = 0;
args.pa_flags = 0;
args.pa_pid = (pid_t) -1;
args.pa_logfd = -1;
args.pa_samplesdir = ".";
args.pa_kernel = "/boot/kernel/kernel";
args.pa_printfile = stderr;
args.pa_interval = DEFAULT_WAIT_INTERVAL;
STAILQ_INIT(&args.pa_head);
ev = NULL;
while ((option = getopt(argc, argv, "CD:EO:P:R:S:Wc:dgk:n:o:p:s:t:w:"))
!= -1)
switch (option) {
case 'C': /* cumulative values */
use_cumulative_counts = !use_cumulative_counts;
args.pa_required |= FLAG_HAS_COUNTING_PMCS;
break;
case 'c': /* CPU */
current_cpu = strtol(optarg, &end, 0);
if (*end != '\0' || current_cpu < 0)
errx(EX_USAGE,
"ERROR: Illegal CPU number \"%s\".",
optarg);
args.pa_required |= FLAG_HAS_SYSTEM_PMCS;
break;
case 'D':
if (stat(optarg, &sb) < 0)
err(EX_OSERR, "ERROR: Cannot stat \"%s\"",
optarg);
if (!S_ISDIR(sb.st_mode))
errx(EX_USAGE, "ERROR: \"%s\" is not a "
"directory", optarg);
args.pa_samplesdir = optarg;
args.pa_flags |= FLAG_HAS_SAMPLESDIR;
args.pa_required |= FLAG_DO_GPROF;
break;
case 'd': /* toggle descendents */
do_descendants = !do_descendants;
args.pa_required |= FLAG_HAS_PROCESS_PMCS;
break;
case 'g': /* produce gprof compatible profiles */
args.pa_flags |= FLAG_DO_GPROF;
break;
case 'k': /* pathname to the kernel */
args.pa_kernel = optarg;
args.pa_required |= FLAG_DO_GPROF;
args.pa_flags |= FLAG_HAS_KERNELPATH;
break;
case 'E': /* log process exit */
do_logprocexit = !do_logprocexit;
args.pa_required |= (FLAG_HAS_PROCESS_PMCS |
FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE);
break;
case 'p': /* process virtual counting PMC */
case 's': /* system-wide counting PMC */
case 'P': /* process virtual sampling PMC */
case 'S': /* system-wide sampling PMC */
if ((ev = malloc(sizeof(*ev))) == NULL)
errx(EX_SOFTWARE, "ERROR: Out of memory.");
switch (option) {
case 'p': ev->ev_mode = PMC_MODE_TC; break;
case 's': ev->ev_mode = PMC_MODE_SC; break;
case 'P': ev->ev_mode = PMC_MODE_TS; break;
case 'S': ev->ev_mode = PMC_MODE_SS; break;
}
if (option == 'P' || option == 'p') {
args.pa_flags |= FLAG_HAS_PROCESS_PMCS;
args.pa_required |= (FLAG_HAS_COMMANDLINE |
FLAG_HAS_PID);
}
if (option == 'P' || option == 'S') {
args.pa_flags |= FLAG_HAS_SAMPLING_PMCS;
args.pa_required |= (FLAG_HAS_PIPE |
FLAG_HAS_OUTPUT_LOGFILE);
}
if (option == 'p' || option == 's')
args.pa_flags |= FLAG_HAS_COUNTING_PMCS;
if (option == 's' || option == 'S')
args.pa_flags |= FLAG_HAS_SYSTEM_PMCS;
ev->ev_spec = strdup(optarg);
if (option == 'S' || option == 'P')
ev->ev_count = current_sampling_count;
else
ev->ev_count = -1;
if (option == 'S' || option == 's')
ev->ev_cpu = current_cpu;
else
ev->ev_cpu = PMC_CPU_ANY;
ev->ev_flags = 0;
if (do_descendants)
ev->ev_flags |= PMC_F_DESCENDANTS;
if (do_logprocexit)
ev->ev_flags |= PMC_F_LOG_PROCEXIT;
if (do_logproccsw)
ev->ev_flags |= PMC_F_LOG_PROCCSW;
ev->ev_cumulative = use_cumulative_counts;
ev->ev_saved = 0LL;
ev->ev_pmcid = PMC_ID_INVALID;
/* extract event name */
c = strcspn(optarg, ", \t");
ev->ev_name = malloc(c + 1);
(void) strncpy(ev->ev_name, optarg, c);
*(ev->ev_name + c) = '\0';
STAILQ_INSERT_TAIL(&args.pa_head, ev, ev_next);
break;
case 'n': /* sampling count */
current_sampling_count = strtol(optarg, &end, 0);
if (*end != '\0' || current_sampling_count <= 0)
errx(EX_USAGE,
"ERROR: Illegal count value \"%s\".",
optarg);
args.pa_required |= FLAG_HAS_SAMPLING_PMCS;
break;
case 'o': /* outputfile */
if (args.pa_printfile != NULL)
(void) fclose(args.pa_printfile);
if ((args.pa_printfile = fopen(optarg, "w")) == NULL)
errx(EX_OSERR, "ERROR: cannot open \"%s\" for "
"writing.", optarg);
args.pa_flags |= FLAG_DO_PRINT;
break;
case 'O': /* sampling output */
if (args.pa_outputpath)
errx(EX_USAGE, "ERROR: option -O may only be "
"specified once.");
args.pa_outputpath = optarg;
args.pa_flags |= FLAG_HAS_OUTPUT_LOGFILE;
break;
case 'R': /* read an existing log file */
if (args.pa_logparser != NULL)
errx(EX_USAGE, "ERROR: option -R may only be "
"specified once.");
args.pa_inputpath = optarg;
if (args.pa_printfile == stderr)
args.pa_printfile = stdout;
args.pa_flags |= FLAG_READ_LOGFILE;
break;
case 't': /* target pid */
pid = strtol(optarg, &end, 0);
if (*end != '\0' || pid <= 0)
errx(EX_USAGE, "ERROR: Illegal pid value "
"\"%s\".", optarg);
args.pa_flags |= FLAG_HAS_PID;
args.pa_required |= FLAG_HAS_PROCESS_PMCS;
args.pa_pid = pid;
break;
case 'w': /* wait interval */
interval = strtod(optarg, &end);
if (*end != '\0' || interval <= 0)
errx(EX_USAGE, "ERROR: Illegal wait interval "
"value \"%s\".", optarg);
args.pa_flags |= FLAG_HAS_WAIT_INTERVAL;
args.pa_required |= FLAG_HAS_COUNTING_PMCS;
args.pa_interval = interval;
break;
case 'W': /* toggle LOG_CSW */
do_logproccsw = !do_logproccsw;
args.pa_required |= (FLAG_HAS_PROCESS_PMCS |
FLAG_HAS_COUNTING_PMCS | FLAG_HAS_OUTPUT_LOGFILE);
break;
case '?':
default:
pmcstat_show_usage();
break;
}
args.pa_argc = (argc -= optind);
args.pa_argv = (argv += optind);
if (argc) /* command line present */
args.pa_flags |= FLAG_HAS_COMMANDLINE;
/*
* Check invocation syntax.
*/
/* disallow -O and -R together */
if (args.pa_outputpath && args.pa_inputpath)
errx(EX_USAGE, "ERROR: options -O and -R are mutually "
"exclusive.");
if (args.pa_flags & FLAG_READ_LOGFILE) {
errmsg = NULL;
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
errmsg = "a command line specification";
else if (args.pa_flags & FLAG_HAS_PID)
errmsg = "option -t";
else if (!STAILQ_EMPTY(&args.pa_head))
errmsg = "a PMC event specification";
if (errmsg)
errx(EX_USAGE, "ERROR: option -R may not be used with "
"%s.", errmsg);
} else if (STAILQ_EMPTY(&args.pa_head))
/* All other uses require a PMC spec. */
pmcstat_show_usage();
/* check for -t pid without a process PMC spec */
if ((args.pa_required & FLAG_HAS_PID) &&
(args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
errx(EX_USAGE, "ERROR: option -t requires a process mode PMC "
"to be specified.");
/* check for process-mode options without a command or -t pid */
if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
(args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) == 0)
errx(EX_USAGE, "ERROR: options -d, -E, -p, -P, and -W require "
"a command line or target process.");
/* check for -p | -P without a target process of some sort */
if ((args.pa_required & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) &&
(args.pa_flags & (FLAG_HAS_COMMANDLINE | FLAG_HAS_PID)) == 0)
errx(EX_USAGE, "ERROR: options -P and -p require a "
"target process or a command line.");
/* check for process-mode options without a process-mode PMC */
if ((args.pa_required & FLAG_HAS_PROCESS_PMCS) &&
(args.pa_flags & FLAG_HAS_PROCESS_PMCS) == 0)
errx(EX_USAGE, "ERROR: options -d, -E, and -W require a "
"process mode PMC to be specified.");
/* check for -c cpu and not system mode PMCs */
if ((args.pa_required & FLAG_HAS_SYSTEM_PMCS) &&
(args.pa_flags & FLAG_HAS_SYSTEM_PMCS) == 0)
errx(EX_USAGE, "ERROR: option -c requires at least one "
"system mode PMC to be specified.");
/* check for counting mode options without a counting PMC */
if ((args.pa_required & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_flags & FLAG_HAS_COUNTING_PMCS) == 0)
errx(EX_USAGE, "ERROR: options -C, -W, -o and -w require at "
"least one counting mode PMC to be specified.");
/* check for sampling mode options without a sampling PMC spec */
if ((args.pa_required & FLAG_HAS_SAMPLING_PMCS) &&
(args.pa_flags & FLAG_HAS_SAMPLING_PMCS) == 0)
errx(EX_USAGE, "ERROR: options -n and -O require at least "
"one sampling mode PMC to be specified.");
if ((args.pa_flags & (FLAG_HAS_PID | FLAG_HAS_COMMANDLINE)) ==
(FLAG_HAS_PID | FLAG_HAS_COMMANDLINE))
errx(EX_USAGE,
"ERROR: option -t cannot be specified with a command "
"line.");
/* check if -g is being used correctly */
if ((args.pa_flags & FLAG_DO_GPROF) &&
!(args.pa_flags & (FLAG_HAS_SAMPLING_PMCS|FLAG_READ_LOGFILE)))
errx(EX_USAGE, "ERROR: option -g requires sampling PMCs or -R "
"to be specified.");
/* check if -O was spuriously specified */
if ((args.pa_flags & FLAG_HAS_OUTPUT_LOGFILE) &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0)
errx(EX_USAGE,
"ERROR: option -O is used only with options "
"-E, -P, -S and -W.");
/* -D dir and -k kernel path require -g */
if ((args.pa_flags & FLAG_HAS_KERNELPATH) &&
((args.pa_flags & FLAG_DO_GPROF) == 0))
errx(EX_USAGE, "ERROR: option -k is only used with -g.");
if ((args.pa_flags & FLAG_HAS_SAMPLESDIR) &&
((args.pa_flags & FLAG_DO_GPROF) == 0))
errx(EX_USAGE, "ERROR: option -D is only used with -g.");
/*
* Disallow textual output of sampling PMCs if counting PMCs
* have also been asked for, mostly because the combined output
* is difficult to make sense of.
*/
if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_flags & FLAG_HAS_SAMPLING_PMCS) &&
((args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0))
errx(EX_USAGE, "ERROR: option -O is required if counting and "
"sampling PMCs are specified together.");
/* if we've been asked to process a log file, do that and exit */
if (args.pa_flags & FLAG_READ_LOGFILE) {
/*
* Print the log in textual form if we haven't been
* asked to generate gmon.out files.
*/
if ((args.pa_flags & FLAG_DO_GPROF) == 0)
args.pa_flags |= FLAG_DO_PRINT;
pmcstat_initialize_logging(&args);
if ((args.pa_logfd = pmcstat_open(args.pa_inputpath,
PMCSTAT_OPEN_FOR_READ)) < 0)
err(EX_OSERR, "ERROR: Cannot open \"%s\" for "
"reading", args.pa_inputpath);
if ((args.pa_logparser = pmclog_open(args.pa_logfd)) == NULL)
err(EX_OSERR, "ERROR: Cannot create parser");
pmcstat_process_log(&args);
exit(EX_OK);
}
/* otherwise, we've been asked to collect data */
if (pmc_init() < 0)
err(EX_UNAVAILABLE,
"ERROR: Initialization of the pmc(3) library failed");
if ((ncpu = pmc_ncpu()) < 0)
err(EX_OSERR, "ERROR: Cannot determine the number CPUs "
"on the system");
if ((npmc = pmc_npmc(0)) < 0) /* assume all CPUs are identical */
err(EX_OSERR, "ERROR: Cannot determine the number of PMCs "
"on CPU %d", 0);
/* Allocate a kqueue */
if ((pmcstat_kq = kqueue()) < 0)
err(EX_OSERR, "ERROR: Cannot allocate kqueue");
/*
* Configure the specified log file or setup a default log
* consumer via a pipe.
*/
if (args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) {
if (args.pa_outputpath) {
if ((args.pa_logfd = pmcstat_open(args.pa_outputpath,
PMCSTAT_OPEN_FOR_WRITE)) < 0)
err(EX_OSERR, "ERROR: Cannot open \"%s\" for "
"writing", args.pa_outputpath);
} else {
/*
* process the log on the fly by reading it in
* through a pipe.
*/
if (pipe(pipefd) < 0)
err(EX_OSERR, "ERROR: pipe(2) failed");
if (fcntl(pipefd[READPIPEFD], F_SETFL, O_NONBLOCK) < 0)
err(EX_OSERR, "ERROR: fcntl(2) failed");
EV_SET(&kev, pipefd[READPIPEFD], EVFILT_READ, EV_ADD,
0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent");
args.pa_logfd = pipefd[WRITEPIPEFD];
args.pa_flags |= (FLAG_HAS_PIPE | FLAG_DO_PRINT);
args.pa_logparser = pmclog_open(pipefd[READPIPEFD]);
}
if (pmc_configure_logfile(args.pa_logfd) < 0)
err(EX_OSERR, "ERROR: Cannot configure log file");
}
/*
* Allocate PMCs.
*/
STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
if (pmc_allocate(ev->ev_spec, ev->ev_mode,
ev->ev_flags, ev->ev_cpu, &ev->ev_pmcid) < 0)
err(EX_OSERR, "ERROR: Cannot allocate %s-mode pmc with "
"specification \"%s\"",
PMC_IS_SYSTEM_MODE(ev->ev_mode) ? "system" : "process",
ev->ev_spec);
if (PMC_IS_SAMPLING_MODE(ev->ev_mode) &&
pmc_set(ev->ev_pmcid, ev->ev_count) < 0)
err(EX_OSERR, "ERROR: Cannot set sampling count "
"for PMC \"%s\"", ev->ev_name);
}
/* compute printout widths */
STAILQ_FOREACH(ev, &args.pa_head, ev_next) {
int counter_width;
int display_width;
int header_width;
(void) pmc_width(ev->ev_pmcid, &counter_width);
header_width = strlen(ev->ev_name) + 2; /* prefix '%c|' */
display_width = (int) floor(counter_width / 3.32193) + 1;
if (header_width > display_width) {
ev->ev_fieldskip = 0;
ev->ev_fieldwidth = header_width;
} else {
ev->ev_fieldskip = display_width -
header_width;
ev->ev_fieldwidth = display_width;
}
}
/*
* If our output is being set to a terminal, register a handler
* for window size changes.
*/
if (isatty(fileno(args.pa_printfile))) {
if (ioctl(fileno(args.pa_printfile), TIOCGWINSZ, &ws) < 0)
err(EX_OSERR, "ERROR: Cannot determine window size");
pmcstat_displayheight = ws.ws_row - 1;
EV_SET(&kev, SIGWINCH, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent for "
"SIGWINCH");
}
EV_SET(&kev, SIGINT, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent for SIGINT");
EV_SET(&kev, SIGIO, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent for SIGIO");
/*
* An exec() failure of a forked child is signalled by the
* child sending the parent a SIGCHLD. We don't register an
* actual signal handler for SIGCHLD, but instead use our
* kqueue to pick up the signal.
*/
EV_SET(&kev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent for SIGCHLD");
/* setup a timer if we have counting mode PMCs needing to be printed */
if ((args.pa_flags & FLAG_HAS_COUNTING_PMCS) &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) {
EV_SET(&kev, 0, EVFILT_TIMER, EV_ADD, 0,
args.pa_interval * 1000, NULL);
if (kevent(pmcstat_kq, &kev, 1, NULL, 0, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot register kevent for "
"timer");
}
/* attach PMCs to the target process, starting it if specified */
if (args.pa_flags & (FLAG_HAS_PID | FLAG_HAS_COMMANDLINE))
pmcstat_setup_process(&args);
/* start the pmcs */
pmcstat_start_pmcs(&args);
/* start the (commandline) process if needed */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
pmcstat_start_process(&args);
/* initialize logging if printing the configured log */
if ((args.pa_flags & FLAG_DO_PRINT) &&
(args.pa_flags & (FLAG_HAS_PIPE | FLAG_HAS_OUTPUT_LOGFILE)))
pmcstat_initialize_logging(&args);
/* Handle SIGINT using the kqueue loop */
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
(void) sigemptyset(&sa.sa_mask);
if (sigaction(SIGINT, &sa, NULL) < 0)
err(EX_OSERR, "ERROR: Cannot install signal handler");
/*
* loop till either the target process (if any) exits, or we
* are killed by a SIGINT.
*/
runstate = PMCSTAT_RUNNING;
do_print = 0;
do {
if ((c = kevent(pmcstat_kq, NULL, 0, &kev, 1, NULL)) <= 0) {
if (errno != EINTR)
err(EX_OSERR, "ERROR: kevent failed");
else
continue;
}
if (kev.flags & EV_ERROR)
errc(EX_OSERR, kev.data, "ERROR: kevent failed");
switch (kev.filter) {
case EVFILT_PROC: /* target has exited */
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE |
FLAG_HAS_PIPE))
runstate = pmcstat_close_log(&args);
else
runstate = PMCSTAT_FINISHED;
do_print = 1;
break;
case EVFILT_READ: /* log file data is present */
runstate = pmcstat_process_log(&args);
break;
case EVFILT_SIGNAL:
if (kev.ident == SIGCHLD) {
/*
* The child process sends us a
* SIGCHLD if its exec() failed. We
* wait for it to exit and then exit
* ourselves.
*/
(void) wait(&c);
runstate = PMCSTAT_FINISHED;
} else if (kev.ident == SIGIO) {
/*
* We get a SIGIO if a PMC loses all
* of its targets, or if logfile
* writes encounter an error.
*/
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE |
FLAG_HAS_PIPE)) {
runstate = pmcstat_close_log(&args);
if (args.pa_flags &
(FLAG_DO_PRINT|FLAG_DO_GPROF))
pmcstat_process_log(&args);
}
do_print = 1; /* print PMCs at exit */
runstate = PMCSTAT_FINISHED;
} else if (kev.ident == SIGINT) {
/* Kill the child process if we started it */
if (args.pa_flags & FLAG_HAS_COMMANDLINE)
if (kill(args.pa_pid, SIGINT) != 0)
err(EX_OSERR, "ERROR: cannot "
"signal child process");
runstate = PMCSTAT_FINISHED;
} else if (kev.ident == SIGWINCH) {
if (ioctl(fileno(args.pa_printfile),
TIOCGWINSZ, &ws) < 0)
err(EX_OSERR, "ERROR: Cannot determine "
"window size");
pmcstat_displayheight = ws.ws_row - 1;
} else
assert(0);
break;
case EVFILT_TIMER: /* print out counting PMCs */
do_print = 1;
break;
}
if (do_print &&
(args.pa_required & FLAG_HAS_OUTPUT_LOGFILE) == 0) {
pmcstat_print_pmcs(&args);
if (runstate == PMCSTAT_FINISHED && /* final newline */
(args.pa_flags & FLAG_DO_PRINT) == 0)
(void) fprintf(args.pa_printfile, "\n");
do_print = 0;
}
} while (runstate != PMCSTAT_FINISHED);
/* flush any pending log entries */
if (args.pa_flags & (FLAG_HAS_OUTPUT_LOGFILE | FLAG_HAS_PIPE))
pmc_flush_logfile();
pmcstat_cleanup(&args);
return 0;
}
|