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perf stat: Print out miss/hit ratio for L1 data-cache events
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / tools / perf / builtin-stat.c
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/color.h"
50 #include "util/header.h"
51 #include "util/cpumap.h"
52 #include "util/thread.h"
53 #include "util/thread_map.h"
54
55 #include <sys/prctl.h>
56 #include <math.h>
57 #include <locale.h>
58
59 #define DEFAULT_SEPARATOR " "
60
61 static struct perf_event_attr default_attrs[] = {
62
63 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
64 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },
65 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
66 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
67
68 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
69 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES },
70 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
71 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
72 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_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_stalled_cycles_stats[MAX_NR_CPUS];
160 struct stats runtime_branches_stats[MAX_NR_CPUS];
161 struct stats runtime_cacherefs_stats[MAX_NR_CPUS];
162 struct stats runtime_l1_dcache_stats[MAX_NR_CPUS];
163 struct stats walltime_nsecs_stats;
164
165 static int create_perf_stat_counter(struct perf_evsel *evsel)
166 {
167 struct perf_event_attr *attr = &evsel->attr;
168
169 if (scale)
170 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
171 PERF_FORMAT_TOTAL_TIME_RUNNING;
172
173 attr->inherit = !no_inherit;
174
175 if (system_wide)
176 return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, false);
177
178 if (target_pid == -1 && target_tid == -1) {
179 attr->disabled = 1;
180 attr->enable_on_exec = 1;
181 }
182
183 return perf_evsel__open_per_thread(evsel, evsel_list->threads, false);
184 }
185
186 /*
187 * Does the counter have nsecs as a unit?
188 */
189 static inline int nsec_counter(struct perf_evsel *evsel)
190 {
191 if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
192 perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
193 return 1;
194
195 return 0;
196 }
197
198 /*
199 * Update various tracking values we maintain to print
200 * more semantic information such as miss/hit ratios,
201 * instruction rates, etc:
202 */
203 static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
204 {
205 if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
206 update_stats(&runtime_nsecs_stats[0], count[0]);
207 else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
208 update_stats(&runtime_cycles_stats[0], count[0]);
209 else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES))
210 update_stats(&runtime_stalled_cycles_stats[0], count[0]);
211 else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS))
212 update_stats(&runtime_branches_stats[0], count[0]);
213 else if (perf_evsel__match(counter, HARDWARE, HW_CACHE_REFERENCES))
214 update_stats(&runtime_cacherefs_stats[0], count[0]);
215 else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1D))
216 update_stats(&runtime_l1_dcache_stats[0], count[0]);
217 }
218
219 /*
220 * Read out the results of a single counter:
221 * aggregate counts across CPUs in system-wide mode
222 */
223 static int read_counter_aggr(struct perf_evsel *counter)
224 {
225 struct perf_stat *ps = counter->priv;
226 u64 *count = counter->counts->aggr.values;
227 int i;
228
229 if (__perf_evsel__read(counter, evsel_list->cpus->nr,
230 evsel_list->threads->nr, scale) < 0)
231 return -1;
232
233 for (i = 0; i < 3; i++)
234 update_stats(&ps->res_stats[i], count[i]);
235
236 if (verbose) {
237 fprintf(stderr, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
238 event_name(counter), count[0], count[1], count[2]);
239 }
240
241 /*
242 * Save the full runtime - to allow normalization during printout:
243 */
244 update_shadow_stats(counter, count);
245
246 return 0;
247 }
248
249 /*
250 * Read out the results of a single counter:
251 * do not aggregate counts across CPUs in system-wide mode
252 */
253 static int read_counter(struct perf_evsel *counter)
254 {
255 u64 *count;
256 int cpu;
257
258 for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
259 if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
260 return -1;
261
262 count = counter->counts->cpu[cpu].values;
263
264 update_shadow_stats(counter, count);
265 }
266
267 return 0;
268 }
269
270 static int run_perf_stat(int argc __used, const char **argv)
271 {
272 unsigned long long t0, t1;
273 struct perf_evsel *counter;
274 int status = 0;
275 int child_ready_pipe[2], go_pipe[2];
276 const bool forks = (argc > 0);
277 char buf;
278
279 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
280 perror("failed to create pipes");
281 exit(1);
282 }
283
284 if (forks) {
285 if ((child_pid = fork()) < 0)
286 perror("failed to fork");
287
288 if (!child_pid) {
289 close(child_ready_pipe[0]);
290 close(go_pipe[1]);
291 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
292
293 /*
294 * Do a dummy execvp to get the PLT entry resolved,
295 * so we avoid the resolver overhead on the real
296 * execvp call.
297 */
298 execvp("", (char **)argv);
299
300 /*
301 * Tell the parent we're ready to go
302 */
303 close(child_ready_pipe[1]);
304
305 /*
306 * Wait until the parent tells us to go.
307 */
308 if (read(go_pipe[0], &buf, 1) == -1)
309 perror("unable to read pipe");
310
311 execvp(argv[0], (char **)argv);
312
313 perror(argv[0]);
314 exit(-1);
315 }
316
317 if (target_tid == -1 && target_pid == -1 && !system_wide)
318 evsel_list->threads->map[0] = child_pid;
319
320 /*
321 * Wait for the child to be ready to exec.
322 */
323 close(child_ready_pipe[1]);
324 close(go_pipe[0]);
325 if (read(child_ready_pipe[0], &buf, 1) == -1)
326 perror("unable to read pipe");
327 close(child_ready_pipe[0]);
328 }
329
330 list_for_each_entry(counter, &evsel_list->entries, node) {
331 if (create_perf_stat_counter(counter) < 0) {
332 if (errno == -EPERM || errno == -EACCES) {
333 error("You may not have permission to collect %sstats.\n"
334 "\t Consider tweaking"
335 " /proc/sys/kernel/perf_event_paranoid or running as root.",
336 system_wide ? "system-wide " : "");
337 } else if (errno == ENOENT) {
338 error("%s event is not supported. ", event_name(counter));
339 } else {
340 error("open_counter returned with %d (%s). "
341 "/bin/dmesg may provide additional information.\n",
342 errno, strerror(errno));
343 }
344 if (child_pid != -1)
345 kill(child_pid, SIGTERM);
346 die("Not all events could be opened.\n");
347 return -1;
348 }
349 }
350
351 if (perf_evlist__set_filters(evsel_list)) {
352 error("failed to set filter with %d (%s)\n", errno,
353 strerror(errno));
354 return -1;
355 }
356
357 /*
358 * Enable counters and exec the command:
359 */
360 t0 = rdclock();
361
362 if (forks) {
363 close(go_pipe[1]);
364 wait(&status);
365 } else {
366 while(!done) sleep(1);
367 }
368
369 t1 = rdclock();
370
371 update_stats(&walltime_nsecs_stats, t1 - t0);
372
373 if (no_aggr) {
374 list_for_each_entry(counter, &evsel_list->entries, node) {
375 read_counter(counter);
376 perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
377 }
378 } else {
379 list_for_each_entry(counter, &evsel_list->entries, node) {
380 read_counter_aggr(counter);
381 perf_evsel__close_fd(counter, evsel_list->cpus->nr,
382 evsel_list->threads->nr);
383 }
384 }
385
386 return WEXITSTATUS(status);
387 }
388
389 static void print_noise_pct(double total, double avg)
390 {
391 double pct = 0.0;
392
393 if (avg)
394 pct = 100.0*total/avg;
395
396 fprintf(stderr, " ( +-%6.2f%% )", pct);
397 }
398
399 static void print_noise(struct perf_evsel *evsel, double avg)
400 {
401 struct perf_stat *ps;
402
403 if (run_count == 1)
404 return;
405
406 ps = evsel->priv;
407 print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
408 }
409
410 static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
411 {
412 double msecs = avg / 1e6;
413 char cpustr[16] = { '\0', };
414 const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-24s";
415
416 if (no_aggr)
417 sprintf(cpustr, "CPU%*d%s",
418 csv_output ? 0 : -4,
419 evsel_list->cpus->map[cpu], csv_sep);
420
421 fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
422
423 if (evsel->cgrp)
424 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
425
426 if (csv_output)
427 return;
428
429 if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
430 fprintf(stderr, " # %8.3f CPUs utilized ", avg / avg_stats(&walltime_nsecs_stats));
431 }
432
433 static void print_stalled_cycles(int cpu, struct perf_evsel *evsel __used, double avg)
434 {
435 double total, ratio = 0.0;
436 const char *color;
437
438 total = avg_stats(&runtime_cycles_stats[cpu]);
439
440 if (total)
441 ratio = avg / total * 100.0;
442
443 color = PERF_COLOR_NORMAL;
444 if (ratio > 75.0)
445 color = PERF_COLOR_RED;
446 else if (ratio > 50.0)
447 color = PERF_COLOR_MAGENTA;
448 else if (ratio > 25.0)
449 color = PERF_COLOR_YELLOW;
450
451 fprintf(stderr, " # ");
452 color_fprintf(stderr, color, "%5.2f%%", ratio);
453 fprintf(stderr, " of all cycles are idle ");
454 }
455
456 static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double avg)
457 {
458 double total, ratio = 0.0;
459 const char *color;
460
461 total = avg_stats(&runtime_branches_stats[cpu]);
462
463 if (total)
464 ratio = avg / total * 100.0;
465
466 color = PERF_COLOR_NORMAL;
467 if (ratio > 20.0)
468 color = PERF_COLOR_RED;
469 else if (ratio > 10.0)
470 color = PERF_COLOR_MAGENTA;
471 else if (ratio > 5.0)
472 color = PERF_COLOR_YELLOW;
473
474 fprintf(stderr, " # ");
475 color_fprintf(stderr, color, "%5.2f%%", ratio);
476 fprintf(stderr, " of all branches ");
477 }
478
479 static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, double avg)
480 {
481 double total, ratio = 0.0;
482 const char *color;
483
484 total = avg_stats(&runtime_l1_dcache_stats[cpu]);
485
486 if (total)
487 ratio = avg / total * 100.0;
488
489 color = PERF_COLOR_NORMAL;
490 if (ratio > 20.0)
491 color = PERF_COLOR_RED;
492 else if (ratio > 10.0)
493 color = PERF_COLOR_MAGENTA;
494 else if (ratio > 5.0)
495 color = PERF_COLOR_YELLOW;
496
497 fprintf(stderr, " # ");
498 color_fprintf(stderr, color, "%5.2f%%", ratio);
499 fprintf(stderr, " of all L1-dcache hits ");
500 }
501
502 static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
503 {
504 double total, ratio = 0.0;
505 char cpustr[16] = { '\0', };
506 const char *fmt;
507
508 if (csv_output)
509 fmt = "%s%.0f%s%s";
510 else if (big_num)
511 fmt = "%s%'18.0f%s%-24s";
512 else
513 fmt = "%s%18.0f%s%-24s";
514
515 if (no_aggr)
516 sprintf(cpustr, "CPU%*d%s",
517 csv_output ? 0 : -4,
518 evsel_list->cpus->map[cpu], csv_sep);
519 else
520 cpu = 0;
521
522 fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
523
524 if (evsel->cgrp)
525 fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
526
527 if (csv_output)
528 return;
529
530 if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
531 total = avg_stats(&runtime_cycles_stats[cpu]);
532
533 if (total)
534 ratio = avg / total;
535
536 fprintf(stderr, " # %4.2f insns per cycle", ratio);
537
538 total = avg_stats(&runtime_stalled_cycles_stats[cpu]);
539
540 if (total && avg) {
541 ratio = total / avg;
542 fprintf(stderr, "\n # %4.2f stalled cycles per insn", ratio);
543 }
544
545 } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&
546 runtime_branches_stats[cpu].n != 0) {
547 print_branch_misses(cpu, evsel, avg);
548 } else if (
549 evsel->attr.type == PERF_TYPE_HW_CACHE &&
550 evsel->attr.config == ( PERF_COUNT_HW_CACHE_L1D |
551 ((PERF_COUNT_HW_CACHE_OP_READ) << 8) |
552 ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&
553 runtime_branches_stats[cpu].n != 0) {
554 print_l1_dcache_misses(cpu, evsel, avg);
555 } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) &&
556 runtime_cacherefs_stats[cpu].n != 0) {
557 total = avg_stats(&runtime_cacherefs_stats[cpu]);
558
559 if (total)
560 ratio = avg * 100 / total;
561
562 fprintf(stderr, " # %8.3f %% of all cache refs ", ratio);
563
564 } else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES)) {
565 print_stalled_cycles(cpu, evsel, avg);
566 } else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
567 total = avg_stats(&runtime_nsecs_stats[cpu]);
568
569 if (total)
570 ratio = 1.0 * avg / total;
571
572 fprintf(stderr, " # %8.3f GHz ", ratio);
573 } else if (runtime_nsecs_stats[cpu].n != 0) {
574 total = avg_stats(&runtime_nsecs_stats[cpu]);
575
576 if (total)
577 ratio = 1000.0 * avg / total;
578
579 fprintf(stderr, " # %8.3f M/sec ", ratio);
580 } else {
581 fprintf(stderr, " ");
582 }
583 }
584
585 /*
586 * Print out the results of a single counter:
587 * aggregated counts in system-wide mode
588 */
589 static void print_counter_aggr(struct perf_evsel *counter)
590 {
591 struct perf_stat *ps = counter->priv;
592 double avg = avg_stats(&ps->res_stats[0]);
593 int scaled = counter->counts->scaled;
594
595 if (scaled == -1) {
596 fprintf(stderr, "%*s%s%*s",
597 csv_output ? 0 : 18,
598 "<not counted>",
599 csv_sep,
600 csv_output ? 0 : -24,
601 event_name(counter));
602
603 if (counter->cgrp)
604 fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
605
606 fputc('\n', stderr);
607 return;
608 }
609
610 if (nsec_counter(counter))
611 nsec_printout(-1, counter, avg);
612 else
613 abs_printout(-1, counter, avg);
614
615 if (csv_output) {
616 fputc('\n', stderr);
617 return;
618 }
619
620 print_noise(counter, avg);
621
622 if (scaled) {
623 double avg_enabled, avg_running;
624
625 avg_enabled = avg_stats(&ps->res_stats[1]);
626 avg_running = avg_stats(&ps->res_stats[2]);
627
628 fprintf(stderr, " (scaled from %.2f%%)",
629 100 * avg_running / avg_enabled);
630 }
631 fprintf(stderr, "\n");
632 }
633
634 /*
635 * Print out the results of a single counter:
636 * does not use aggregated count in system-wide
637 */
638 static void print_counter(struct perf_evsel *counter)
639 {
640 u64 ena, run, val;
641 int cpu;
642
643 for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
644 val = counter->counts->cpu[cpu].val;
645 ena = counter->counts->cpu[cpu].ena;
646 run = counter->counts->cpu[cpu].run;
647 if (run == 0 || ena == 0) {
648 fprintf(stderr, "CPU%*d%s%*s%s%*s",
649 csv_output ? 0 : -4,
650 evsel_list->cpus->map[cpu], csv_sep,
651 csv_output ? 0 : 18,
652 "<not counted>", csv_sep,
653 csv_output ? 0 : -24,
654 event_name(counter));
655
656 if (counter->cgrp)
657 fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
658
659 fputc('\n', stderr);
660 continue;
661 }
662
663 if (nsec_counter(counter))
664 nsec_printout(cpu, counter, val);
665 else
666 abs_printout(cpu, counter, val);
667
668 if (!csv_output) {
669 print_noise(counter, 1.0);
670
671 if (run != ena) {
672 fprintf(stderr, " (scaled from %.2f%%)",
673 100.0 * run / ena);
674 }
675 }
676 fputc('\n', stderr);
677 }
678 }
679
680 static void print_stat(int argc, const char **argv)
681 {
682 struct perf_evsel *counter;
683 int i;
684
685 fflush(stdout);
686
687 if (!csv_output) {
688 fprintf(stderr, "\n");
689 fprintf(stderr, " Performance counter stats for ");
690 if(target_pid == -1 && target_tid == -1) {
691 fprintf(stderr, "\'%s", argv[0]);
692 for (i = 1; i < argc; i++)
693 fprintf(stderr, " %s", argv[i]);
694 } else if (target_pid != -1)
695 fprintf(stderr, "process id \'%d", target_pid);
696 else
697 fprintf(stderr, "thread id \'%d", target_tid);
698
699 fprintf(stderr, "\'");
700 if (run_count > 1)
701 fprintf(stderr, " (%d runs)", run_count);
702 fprintf(stderr, ":\n\n");
703 }
704
705 if (no_aggr) {
706 list_for_each_entry(counter, &evsel_list->entries, node)
707 print_counter(counter);
708 } else {
709 list_for_each_entry(counter, &evsel_list->entries, node)
710 print_counter_aggr(counter);
711 }
712
713 if (!csv_output) {
714 fprintf(stderr, "\n");
715 fprintf(stderr, " %18.9f seconds time elapsed",
716 avg_stats(&walltime_nsecs_stats)/1e9);
717 if (run_count > 1) {
718 print_noise_pct(stddev_stats(&walltime_nsecs_stats),
719 avg_stats(&walltime_nsecs_stats));
720 }
721 fprintf(stderr, "\n\n");
722 }
723 }
724
725 static volatile int signr = -1;
726
727 static void skip_signal(int signo)
728 {
729 if(child_pid == -1)
730 done = 1;
731
732 signr = signo;
733 }
734
735 static void sig_atexit(void)
736 {
737 if (child_pid != -1)
738 kill(child_pid, SIGTERM);
739
740 if (signr == -1)
741 return;
742
743 signal(signr, SIG_DFL);
744 kill(getpid(), signr);
745 }
746
747 static const char * const stat_usage[] = {
748 "perf stat [<options>] [<command>]",
749 NULL
750 };
751
752 static int stat__set_big_num(const struct option *opt __used,
753 const char *s __used, int unset)
754 {
755 big_num_opt = unset ? 0 : 1;
756 return 0;
757 }
758
759 static const struct option options[] = {
760 OPT_CALLBACK('e', "event", &evsel_list, "event",
761 "event selector. use 'perf list' to list available events",
762 parse_events),
763 OPT_CALLBACK(0, "filter", &evsel_list, "filter",
764 "event filter", parse_filter),
765 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
766 "child tasks do not inherit counters"),
767 OPT_INTEGER('p', "pid", &target_pid,
768 "stat events on existing process id"),
769 OPT_INTEGER('t', "tid", &target_tid,
770 "stat events on existing thread id"),
771 OPT_BOOLEAN('a', "all-cpus", &system_wide,
772 "system-wide collection from all CPUs"),
773 OPT_BOOLEAN('c', "scale", &scale,
774 "scale/normalize counters"),
775 OPT_INCR('v', "verbose", &verbose,
776 "be more verbose (show counter open errors, etc)"),
777 OPT_INTEGER('r', "repeat", &run_count,
778 "repeat command and print average + stddev (max: 100)"),
779 OPT_BOOLEAN('n', "null", &null_run,
780 "null run - dont start any counters"),
781 OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
782 "print large numbers with thousands\' separators",
783 stat__set_big_num),
784 OPT_STRING('C', "cpu", &cpu_list, "cpu",
785 "list of cpus to monitor in system-wide"),
786 OPT_BOOLEAN('A', "no-aggr", &no_aggr,
787 "disable CPU count aggregation"),
788 OPT_STRING('x', "field-separator", &csv_sep, "separator",
789 "print counts with custom separator"),
790 OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
791 "monitor event in cgroup name only",
792 parse_cgroups),
793 OPT_END()
794 };
795
796 int cmd_stat(int argc, const char **argv, const char *prefix __used)
797 {
798 struct perf_evsel *pos;
799 int status = -ENOMEM;
800
801 setlocale(LC_ALL, "");
802
803 evsel_list = perf_evlist__new(NULL, NULL);
804 if (evsel_list == NULL)
805 return -ENOMEM;
806
807 argc = parse_options(argc, argv, options, stat_usage,
808 PARSE_OPT_STOP_AT_NON_OPTION);
809
810 if (csv_sep)
811 csv_output = true;
812 else
813 csv_sep = DEFAULT_SEPARATOR;
814
815 /*
816 * let the spreadsheet do the pretty-printing
817 */
818 if (csv_output) {
819 /* User explicitely passed -B? */
820 if (big_num_opt == 1) {
821 fprintf(stderr, "-B option not supported with -x\n");
822 usage_with_options(stat_usage, options);
823 } else /* Nope, so disable big number formatting */
824 big_num = false;
825 } else if (big_num_opt == 0) /* User passed --no-big-num */
826 big_num = false;
827
828 if (!argc && target_pid == -1 && target_tid == -1)
829 usage_with_options(stat_usage, options);
830 if (run_count <= 0)
831 usage_with_options(stat_usage, options);
832
833 /* no_aggr, cgroup are for system-wide only */
834 if ((no_aggr || nr_cgroups) && !system_wide) {
835 fprintf(stderr, "both cgroup and no-aggregation "
836 "modes only available in system-wide mode\n");
837
838 usage_with_options(stat_usage, options);
839 }
840
841 /* Set attrs and nr_counters if no event is selected and !null_run */
842 if (!null_run && !evsel_list->nr_entries) {
843 size_t c;
844
845 for (c = 0; c < ARRAY_SIZE(default_attrs); ++c) {
846 pos = perf_evsel__new(&default_attrs[c], c);
847 if (pos == NULL)
848 goto out;
849 perf_evlist__add(evsel_list, pos);
850 }
851 }
852
853 if (target_pid != -1)
854 target_tid = target_pid;
855
856 evsel_list->threads = thread_map__new(target_pid, target_tid);
857 if (evsel_list->threads == NULL) {
858 pr_err("Problems finding threads of monitor\n");
859 usage_with_options(stat_usage, options);
860 }
861
862 if (system_wide)
863 evsel_list->cpus = cpu_map__new(cpu_list);
864 else
865 evsel_list->cpus = cpu_map__dummy_new();
866
867 if (evsel_list->cpus == NULL) {
868 perror("failed to parse CPUs map");
869 usage_with_options(stat_usage, options);
870 return -1;
871 }
872
873 list_for_each_entry(pos, &evsel_list->entries, node) {
874 if (perf_evsel__alloc_stat_priv(pos) < 0 ||
875 perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
876 perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
877 goto out_free_fd;
878 }
879
880 /*
881 * We dont want to block the signals - that would cause
882 * child tasks to inherit that and Ctrl-C would not work.
883 * What we want is for Ctrl-C to work in the exec()-ed
884 * task, but being ignored by perf stat itself:
885 */
886 atexit(sig_atexit);
887 signal(SIGINT, skip_signal);
888 signal(SIGALRM, skip_signal);
889 signal(SIGABRT, skip_signal);
890
891 status = 0;
892 for (run_idx = 0; run_idx < run_count; run_idx++) {
893 if (run_count != 1 && verbose)
894 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
895 status = run_perf_stat(argc, argv);
896 }
897
898 if (status != -1)
899 print_stat(argc, argv);
900 out_free_fd:
901 list_for_each_entry(pos, &evsel_list->entries, node)
902 perf_evsel__free_stat_priv(pos);
903 perf_evlist__delete_maps(evsel_list);
904 out:
905 perf_evlist__delete(evsel_list);
906 return status;
907 }
kernel source for telekom puls (alcatel/mediatek)