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perf evlist: Store pointer to the cpu and thread maps
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1 /*
2 * builtin-stat.c
3 *
4 * Builtin stat command: Give a precise performance counters summary
5 * overview about any workload, CPU or specific PID.
6 *
7 * Sample output:
8
9 $ perf stat ~/hackbench 10
10 Time: 0.104
11
12 Performance counter stats for '/home/mingo/hackbench':
13
14 1255.538611 task clock ticks # 10.143 CPU utilization factor
15 54011 context switches # 0.043 M/sec
16 385 CPU migrations # 0.000 M/sec
17 17755 pagefaults # 0.014 M/sec
18 3808323185 CPU cycles # 3033.219 M/sec
19 1575111190 instructions # 1254.530 M/sec
20 17367895 cache references # 13.833 M/sec
21 7674421 cache misses # 6.112 M/sec
22
23 Wall-clock time elapsed: 123.786620 msecs
24
25 *
26 * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
27 *
28 * Improvements and fixes by:
29 *
30 * Arjan van de Ven <arjan@linux.intel.com>
31 * Yanmin Zhang <yanmin.zhang@intel.com>
32 * Wu Fengguang <fengguang.wu@intel.com>
33 * Mike Galbraith <efault@gmx.de>
34 * Paul Mackerras <paulus@samba.org>
35 * Jaswinder Singh Rajput <jaswinder@kernel.org>
36 *
37 * Released under the GPL v2. (and only v2, not any later version)
38 */
39
40 #include "perf.h"
41 #include "builtin.h"
42 #include "util/util.h"
43 #include "util/parse-options.h"
44 #include "util/parse-events.h"
45 #include "util/event.h"
46 #include "util/evlist.h"
47 #include "util/evsel.h"
48 #include "util/debug.h"
49 #include "util/header.h"
50 #include "util/cpumap.h"
51 #include "util/thread.h"
52 #include "util/thread_map.h"
53
54 #include <sys/prctl.h>
55 #include <math.h>
56 #include <locale.h>
57
58 #define DEFAULT_SEPARATOR " "
59
60 static struct perf_event_attr default_attrs[] = {
61
62 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
63 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },
64 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
65 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
66
67 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
68 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
69 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
70 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },
71 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES },
72 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
73
74 };
75
76 struct perf_evlist *evsel_list;
77
78 static bool system_wide = false;
79 static int run_idx = 0;
80
81 static int run_count = 1;
82 static bool no_inherit = false;
83 static bool scale = true;
84 static bool no_aggr = false;
85 static pid_t target_pid = -1;
86 static pid_t target_tid = -1;
87 static pid_t child_pid = -1;
88 static bool null_run = false;
89 static bool big_num = true;
90 static int big_num_opt = -1;
91 static const char *cpu_list;
92 static const char *csv_sep = NULL;
93 static bool csv_output = false;
94
95 static volatile int done = 0;
96
97 struct stats
98 {
99 double n, mean, M2;
100 };
101
102 struct perf_stat {
103 struct stats res_stats[3];
104 };
105
106 static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
107 {
108 evsel->priv = zalloc(sizeof(struct perf_stat));
109 return evsel->priv == NULL ? -ENOMEM : 0;
110 }
111
112 static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
113 {
114 free(evsel->priv);
115 evsel->priv = NULL;
116 }
117
118 static void update_stats(struct stats *stats, u64 val)
119 {
120 double delta;
121
122 stats->n++;
123 delta = val - stats->mean;
124 stats->mean += delta / stats->n;
125 stats->M2 += delta*(val - stats->mean);
126 }
127
128 static double avg_stats(struct stats *stats)
129 {
130 return stats->mean;
131 }
132
133 /*
134 * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
135 *
136 * (\Sum n_i^2) - ((\Sum n_i)^2)/n
137 * s^2 = -------------------------------
138 * n - 1
139 *
140 * http://en.wikipedia.org/wiki/Stddev
141 *
142 * The std dev of the mean is related to the std dev by:
143 *
144 * s
145 * s_mean = -------
146 * sqrt(n)
147 *
148 */
149 static double stddev_stats(struct stats *stats)
150 {
151 double variance = stats->M2 / (stats->n - 1);
152 double variance_mean = variance / stats->n;
153
154 return sqrt(variance_mean);
155 }
156
157 struct stats runtime_nsecs_stats[MAX_NR_CPUS];
158 struct stats runtime_cycles_stats[MAX_NR_CPUS];
159 struct stats runtime_branches_stats[MAX_NR_CPUS];
160 struct stats walltime_nsecs_stats;
161
162 static int create_perf_stat_counter(struct perf_evsel *evsel)
163 {
164 struct perf_event_attr *attr = &evsel->attr;
165
166 if (scale)
167 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
168 PERF_FORMAT_TOTAL_TIME_RUNNING;
169
170 if (system_wide)
171 return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, false, false);
172
173 attr->inherit = !no_inherit;
174 if (target_pid == -1 && target_tid == -1) {
175 attr->disabled = 1;
176 attr->enable_on_exec = 1;
177 }
178
179 return perf_evsel__open_per_thread(evsel, evsel_list->threads, false, false);
180 }
181
182 /*
183 * Does the counter have nsecs as a unit?
184 */
185 static inline int nsec_counter(struct perf_evsel *evsel)
186 {
187 if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
188 perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
189 return 1;
190
191 return 0;
192 }
193
194 /*
195 * Read out the results of a single counter:
196 * aggregate counts across CPUs in system-wide mode
197 */
198 static int read_counter_aggr(struct perf_evsel *counter)
199 {
200 struct perf_stat *ps = counter->priv;
201 u64 *count = counter->counts->aggr.values;
202 int i;
203
204 if (__perf_evsel__read(counter, evsel_list->cpus->nr,
205 evsel_list->threads->nr, scale) < 0)
206 return -1;
207
208 for (i = 0; i < 3; i++)
209 update_stats(&ps->res_stats[i], count[i]);
210
211 if (verbose) {
212 fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
213 event_name(counter), count[0], count[1], count[2]);
214 }
215
216 /*
217 * Save the full runtime - to allow normalization during printout:
218 */
219 if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
220 update_stats(&runtime_nsecs_stats[0], count[0]);
221 if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
222 update_stats(&runtime_cycles_stats[0], count[0]);
223 if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
224 update_stats(&runtime_branches_stats[0], count[0]);
225
226 return 0;
227 }
228
229 /*
230 * Read out the results of a single counter:
231 * do not aggregate counts across CPUs in system-wide mode
232 */
233 static int read_counter(struct perf_evsel *counter)
234 {
235 u64 *count;
236 int cpu;
237
238 for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
239 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
240 return -1;
241
242 count = counter->counts->cpu[cpu].values;
243
244 if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
245 update_stats(&runtime_nsecs_stats[cpu], count[0]);
246 if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
247 update_stats(&runtime_cycles_stats[cpu], count[0]);
248 if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
249 update_stats(&runtime_branches_stats[cpu], count[0]);
250 }
251
252 return 0;
253 }
254
255 static int run_perf_stat(int argc __used, const char **argv)
256 {
257 unsigned long long t0, t1;
258 struct perf_evsel *counter;
259 int status = 0;
260 int child_ready_pipe[2], go_pipe[2];
261 const bool forks = (argc > 0);
262 char buf;
263
264 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
265 perror("failed to create pipes");
266 exit(1);
267 }
268
269 if (forks) {
270 if ((child_pid = fork()) < 0)
271 perror("failed to fork");
272
273 if (!child_pid) {
274 close(child_ready_pipe[0]);
275 close(go_pipe[1]);
276 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
277
278 /*
279 * Do a dummy execvp to get the PLT entry resolved,
280 * so we avoid the resolver overhead on the real
281 * execvp call.
282 */
283 execvp("", (char **)argv);
284
285 /*
286 * Tell the parent we're ready to go
287 */
288 close(child_ready_pipe[1]);
289
290 /*
291 * Wait until the parent tells us to go.
292 */
293 if (read(go_pipe[0], &buf, 1) == -1)
294 perror("unable to read pipe");
295
296 execvp(argv[0], (char **)argv);
297
298 perror(argv[0]);
299 exit(-1);
300 }
301
302 if (target_tid == -1 && target_pid == -1 && !system_wide)
303 evsel_list->threads->map[0] = child_pid;
304
305 /*
306 * Wait for the child to be ready to exec.
307 */
308 close(child_ready_pipe[1]);
309 close(go_pipe[0]);
310 if (read(child_ready_pipe[0], &buf, 1) == -1)
311 perror("unable to read pipe");
312 close(child_ready_pipe[0]);
313 }
314
315 list_for_each_entry(counter, &evsel_list->entries, node) {
316 if (create_perf_stat_counter(counter) < 0) {
317 if (errno == -EPERM || errno == -EACCES) {
318 error("You may not have permission to collect %sstats.\n"
319 "\t Consider tweaking"
320 " /proc/sys/kernel/perf_event_paranoid or running as root.",
321 system_wide ? "system-wide " : "");
322 } else if (errno == ENOENT) {
323 error("%s event is not supported. ", event_name(counter));
324 } else {
325 error("open_counter returned with %d (%s). "
326 "/bin/dmesg may provide additional information.\n",
327 errno, strerror(errno));
328 }
329 if (child_pid != -1)
330 kill(child_pid, SIGTERM);
331 die("Not all events could be opened.\n");
332 return -1;
333 }
334 }
335
336 /*
337 * Enable counters and exec the command:
338 */
339 t0 = rdclock();
340
341 if (forks) {
342 close(go_pipe[1]);
343 wait(&status);
344 } else {
345 while(!done) sleep(1);
346 }
347
348 t1 = rdclock();
349
350 update_stats(&walltime_nsecs_stats, t1 - t0);
351
352 if (no_aggr) {
353 list_for_each_entry(counter, &evsel_list->entries, node) {
354 read_counter(counter);
355 perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
356 }
357 } else {
358 list_for_each_entry(counter, &evsel_list->entries, node) {
359 read_counter_aggr(counter);
360 perf_evsel__close_fd(counter, evsel_list->cpus->nr,
361 evsel_list->threads->nr);
362 }
363 }
364
365 return WEXITSTATUS(status);
366 }
367
368 static void print_noise(struct perf_evsel *evsel, double avg)
369 {
370 struct perf_stat *ps;
371
372 if (run_count == 1)
373 return;
374
375 ps = evsel->priv;
376 fprintf(stderr, " ( +- %7.3f%% )",
377 100 * stddev_stats(&ps->res_stats[0]) / avg);
378 }
379
380 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
381 {
382 double msecs = avg / 1e6;
383 char cpustr[16] = { '\0', };
384 const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-24s";
385
386 if (no_aggr)
387 sprintf(cpustr, "CPU%*d%s",
388 csv_output ? 0 : -4,
389 evsel_list->cpus->map[cpu], csv_sep);
390
391 fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
392
393 if (csv_output)
394 return;
395
396 if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
397 fprintf(stderr, " # %10.3f CPUs ",
398 avg / avg_stats(&walltime_nsecs_stats));
399 }
400
401 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
402 {
403 double total, ratio = 0.0;
404 char cpustr[16] = { '\0', };
405 const char *fmt;
406
407 if (csv_output)
408 fmt = "%s%.0f%s%s";
409 else if (big_num)
410 fmt = "%s%'18.0f%s%-24s";
411 else
412 fmt = "%s%18.0f%s%-24s";
413
414 if (no_aggr)
415 sprintf(cpustr, "CPU%*d%s",
416 csv_output ? 0 : -4,
417 evsel_list->cpus->map[cpu], csv_sep);
418 else
419 cpu = 0;
420
421 fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
422
423 if (csv_output)
424 return;
425
426 if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
427 total = avg_stats(&runtime_cycles_stats[cpu]);
428
429 if (total)
430 ratio = avg / total;
431
432 fprintf(stderr, " # %10.3f IPC ", ratio);
433 } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
434 runtime_branches_stats[cpu].n != 0) {
435 total = avg_stats(&runtime_branches_stats[cpu]);
436
437 if (total)
438 ratio = avg * 100 / total;
439
440 fprintf(stderr, " # %10.3f %% ", ratio);
441
442 } else if (runtime_nsecs_stats[cpu].n != 0) {
443 total = avg_stats(&runtime_nsecs_stats[cpu]);
444
445 if (total)
446 ratio = 1000.0 * avg / total;
447
448 fprintf(stderr, " # %10.3f M/sec", ratio);
449 }
450 }
451
452 /*
453 * Print out the results of a single counter:
454 * aggregated counts in system-wide mode
455 */
456 static void print_counter_aggr(struct perf_evsel *counter)
457 {
458 struct perf_stat *ps = counter->priv;
459 double avg = avg_stats(&ps->res_stats[0]);
460 int scaled = counter->counts->scaled;
461
462 if (scaled == -1) {
463 fprintf(stderr, "%*s%s%-24s\n",
464 csv_output ? 0 : 18,
465 "<not counted>", csv_sep, event_name(counter));
466 return;
467 }
468
469 if (nsec_counter(counter))
470 nsec_printout(-1, counter, avg);
471 else
472 abs_printout(-1, counter, avg);
473
474 if (csv_output) {
475 fputc('\n', stderr);
476 return;
477 }
478
479 print_noise(counter, avg);
480
481 if (scaled) {
482 double avg_enabled, avg_running;
483
484 avg_enabled = avg_stats(&ps->res_stats[1]);
485 avg_running = avg_stats(&ps->res_stats[2]);
486
487 fprintf(stderr, " (scaled from %.2f%%)",
488 100 * avg_running / avg_enabled);
489 }
490
491 fprintf(stderr, "\n");
492 }
493
494 /*
495 * Print out the results of a single counter:
496 * does not use aggregated count in system-wide
497 */
498 static void print_counter(struct perf_evsel *counter)
499 {
500 u64 ena, run, val;
501 int cpu;
502
503 for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
504 val = counter->counts->cpu[cpu].val;
505 ena = counter->counts->cpu[cpu].ena;
506 run = counter->counts->cpu[cpu].run;
507 if (run == 0 || ena == 0) {
508 fprintf(stderr, "CPU%*d%s%*s%s%-24s",
509 csv_output ? 0 : -4,
510 evsel_list->cpus->map[cpu], csv_sep,
511 csv_output ? 0 : 18,
512 "<not counted>", csv_sep,
513 event_name(counter));
514
515 fprintf(stderr, "\n");
516 continue;
517 }
518
519 if (nsec_counter(counter))
520 nsec_printout(cpu, counter, val);
521 else
522 abs_printout(cpu, counter, val);
523
524 if (!csv_output) {
525 print_noise(counter, 1.0);
526
527 if (run != ena) {
528 fprintf(stderr, " (scaled from %.2f%%)",
529 100.0 * run / ena);
530 }
531 }
532 fprintf(stderr, "\n");
533 }
534 }
535
536 static void print_stat(int argc, const char **argv)
537 {
538 struct perf_evsel *counter;
539 int i;
540
541 fflush(stdout);
542
543 if (!csv_output) {
544 fprintf(stderr, "\n");
545 fprintf(stderr, " Performance counter stats for ");
546 if(target_pid == -1 && target_tid == -1) {
547 fprintf(stderr, "\'%s", argv[0]);
548 for (i = 1; i < argc; i++)
549 fprintf(stderr, " %s", argv[i]);
550 } else if (target_pid != -1)
551 fprintf(stderr, "process id \'%d", target_pid);
552 else
553 fprintf(stderr, "thread id \'%d", target_tid);
554
555 fprintf(stderr, "\'");
556 if (run_count > 1)
557 fprintf(stderr, " (%d runs)", run_count);
558 fprintf(stderr, ":\n\n");
559 }
560
561 if (no_aggr) {
562 list_for_each_entry(counter, &evsel_list->entries, node)
563 print_counter(counter);
564 } else {
565 list_for_each_entry(counter, &evsel_list->entries, node)
566 print_counter_aggr(counter);
567 }
568
569 if (!csv_output) {
570 fprintf(stderr, "\n");
571 fprintf(stderr, " %18.9f seconds time elapsed",
572 avg_stats(&walltime_nsecs_stats)/1e9);
573 if (run_count > 1) {
574 fprintf(stderr, " ( +- %7.3f%% )",
575 100*stddev_stats(&walltime_nsecs_stats) /
576 avg_stats(&walltime_nsecs_stats));
577 }
578 fprintf(stderr, "\n\n");
579 }
580 }
581
582 static volatile int signr = -1;
583
584 static void skip_signal(int signo)
585 {
586 if(child_pid == -1)
587 done = 1;
588
589 signr = signo;
590 }
591
592 static void sig_atexit(void)
593 {
594 if (child_pid != -1)
595 kill(child_pid, SIGTERM);
596
597 if (signr == -1)
598 return;
599
600 signal(signr, SIG_DFL);
601 kill(getpid(), signr);
602 }
603
604 static const char * const stat_usage[] = {
605 "perf stat [<options>] [<command>]",
606 NULL
607 };
608
609 static int stat__set_big_num(const struct option *opt __used,
610 const char *s __used, int unset)
611 {
612 big_num_opt = unset ? 0 : 1;
613 return 0;
614 }
615
616 static const struct option options[] = {
617 OPT_CALLBACK('e', "event", &evsel_list, "event",
618 "event selector. use 'perf list' to list available events",
619 parse_events),
620 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
621 "child tasks do not inherit counters"),
622 OPT_INTEGER('p', "pid", &target_pid,
623 "stat events on existing process id"),
624 OPT_INTEGER('t', "tid", &target_tid,
625 "stat events on existing thread id"),
626 OPT_BOOLEAN('a', "all-cpus", &system_wide,
627 "system-wide collection from all CPUs"),
628 OPT_BOOLEAN('c', "scale", &scale,
629 "scale/normalize counters"),
630 OPT_INCR('v', "verbose", &verbose,
631 "be more verbose (show counter open errors, etc)"),
632 OPT_INTEGER('r', "repeat", &run_count,
633 "repeat command and print average + stddev (max: 100)"),
634 OPT_BOOLEAN('n', "null", &null_run,
635 "null run - dont start any counters"),
636 OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
637 "print large numbers with thousands\' separators",
638 stat__set_big_num),
639 OPT_STRING('C', "cpu", &cpu_list, "cpu",
640 "list of cpus to monitor in system-wide"),
641 OPT_BOOLEAN('A', "no-aggr", &no_aggr,
642 "disable CPU count aggregation"),
643 OPT_STRING('x', "field-separator", &csv_sep, "separator",
644 "print counts with custom separator"),
645 OPT_END()
646 };
647
648 int cmd_stat(int argc, const char **argv, const char *prefix __used)
649 {
650 struct perf_evsel *pos;
651 int status = -ENOMEM;
652
653 setlocale(LC_ALL, "");
654
655 evsel_list = perf_evlist__new(NULL, NULL);
656 if (evsel_list == NULL)
657 return -ENOMEM;
658
659 argc = parse_options(argc, argv, options, stat_usage,
660 PARSE_OPT_STOP_AT_NON_OPTION);
661
662 if (csv_sep)
663 csv_output = true;
664 else
665 csv_sep = DEFAULT_SEPARATOR;
666
667 /*
668 * let the spreadsheet do the pretty-printing
669 */
670 if (csv_output) {
671 /* User explicitely passed -B? */
672 if (big_num_opt == 1) {
673 fprintf(stderr, "-B option not supported with -x\n");
674 usage_with_options(stat_usage, options);
675 } else /* Nope, so disable big number formatting */
676 big_num = false;
677 } else if (big_num_opt == 0) /* User passed --no-big-num */
678 big_num = false;
679
680 if (!argc && target_pid == -1 && target_tid == -1)
681 usage_with_options(stat_usage, options);
682 if (run_count <= 0)
683 usage_with_options(stat_usage, options);
684
685 /* no_aggr is for system-wide only */
686 if (no_aggr && !system_wide)
687 usage_with_options(stat_usage, options);
688
689 /* Set attrs and nr_counters if no event is selected and !null_run */
690 if (!null_run && !evsel_list->nr_entries) {
691 size_t c;
692
693 for (c = 0; c < ARRAY_SIZE(default_attrs); ++c) {
694 pos = perf_evsel__new(&default_attrs[c], c);
695 if (pos == NULL)
696 goto out;
697 perf_evlist__add(evsel_list, pos);
698 }
699 }
700
701 if (target_pid != -1)
702 target_tid = target_pid;
703
704 evsel_list->threads = thread_map__new(target_pid, target_tid);
705 if (evsel_list->threads == NULL) {
706 pr_err("Problems finding threads of monitor\n");
707 usage_with_options(stat_usage, options);
708 }
709
710 if (system_wide)
711 evsel_list->cpus = cpu_map__new(cpu_list);
712 else
713 evsel_list->cpus = cpu_map__dummy_new();
714
715 if (evsel_list->cpus == NULL) {
716 perror("failed to parse CPUs map");
717 usage_with_options(stat_usage, options);
718 return -1;
719 }
720
721 list_for_each_entry(pos, &evsel_list->entries, node) {
722 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
723 perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
724 perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
725 goto out_free_fd;
726 }
727
728 /*
729 * We dont want to block the signals - that would cause
730 * child tasks to inherit that and Ctrl-C would not work.
731 * What we want is for Ctrl-C to work in the exec()-ed
732 * task, but being ignored by perf stat itself:
733 */
734 atexit(sig_atexit);
735 signal(SIGINT, skip_signal);
736 signal(SIGALRM, skip_signal);
737 signal(SIGABRT, skip_signal);
738
739 status = 0;
740 for (run_idx = 0; run_idx < run_count; run_idx++) {
741 if (run_count != 1 && verbose)
742 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
743 status = run_perf_stat(argc, argv);
744 }
745
746 if (status != -1)
747 print_stat(argc, argv);
748 out_free_fd:
749 list_for_each_entry(pos, &evsel_list->entries, node)
750 perf_evsel__free_stat_priv(pos);
751 perf_evlist__delete(evsel_list);
752 out:
753 perf_evlist__delete_maps(evsel_list);
754 return status;
755 }
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