Commit | Line | Data |
---|---|---|
ddcacfa0 | 1 | /* |
bf9e1876 IM |
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: | |
ddcacfa0 | 8 | |
bf9e1876 IM |
9 | $ perf stat ~/hackbench 10 |
10 | Time: 0.104 | |
ddcacfa0 | 11 | |
bf9e1876 | 12 | Performance counter stats for '/home/mingo/hackbench': |
ddcacfa0 | 13 | |
bf9e1876 IM |
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 | |
ddcacfa0 | 22 | |
bf9e1876 | 23 | Wall-clock time elapsed: 123.786620 msecs |
ddcacfa0 | 24 | |
5242519b IM |
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> | |
6e750a8f | 35 | * Jaswinder Singh Rajput <jaswinder@kernel.org> |
5242519b IM |
36 | * |
37 | * Released under the GPL v2. (and only v2, not any later version) | |
ddcacfa0 IM |
38 | */ |
39 | ||
1a482f38 | 40 | #include "perf.h" |
16f762a2 | 41 | #include "builtin.h" |
148be2c1 | 42 | #include "util/util.h" |
5242519b IM |
43 | #include "util/parse-options.h" |
44 | #include "util/parse-events.h" | |
8f28827a FW |
45 | #include "util/event.h" |
46 | #include "util/debug.h" | |
ddcacfa0 | 47 | |
ddcacfa0 | 48 | #include <sys/prctl.h> |
42202dd5 | 49 | #include <math.h> |
16c8a109 | 50 | |
cdd6c482 | 51 | static struct perf_event_attr default_attrs[] = { |
ddcacfa0 | 52 | |
f4dbfa8f PZ |
53 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK }, |
54 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES}, | |
55 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS }, | |
56 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS }, | |
57 | ||
58 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES }, | |
59 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS }, | |
60 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES}, | |
61 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES }, | |
62 | ||
ddcacfa0 | 63 | }; |
5242519b | 64 | |
a21ca2ca | 65 | static int system_wide = 0; |
f37a291c | 66 | static unsigned int nr_cpus = 0; |
3d632595 | 67 | static int run_idx = 0; |
ddcacfa0 | 68 | |
3d632595 JSR |
69 | static int run_count = 1; |
70 | static int inherit = 1; | |
66cf7829 | 71 | static int scale = 1; |
933da83a CW |
72 | static pid_t target_pid = -1; |
73 | static pid_t child_pid = -1; | |
0cfb7a13 | 74 | static int null_run = 0; |
ddcacfa0 | 75 | |
3d632595 | 76 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; |
42202dd5 | 77 | |
63d40deb | 78 | static int event_scaled[MAX_COUNTERS]; |
3d632595 | 79 | |
506d4bc8 PZ |
80 | struct stats |
81 | { | |
8a02631a | 82 | double n, mean, M2; |
506d4bc8 | 83 | }; |
42202dd5 | 84 | |
9e9772c4 PZ |
85 | static void update_stats(struct stats *stats, u64 val) |
86 | { | |
8a02631a | 87 | double delta; |
9e9772c4 | 88 | |
8a02631a PZ |
89 | stats->n++; |
90 | delta = val - stats->mean; | |
91 | stats->mean += delta / stats->n; | |
92 | stats->M2 += delta*(val - stats->mean); | |
9e9772c4 PZ |
93 | } |
94 | ||
506d4bc8 PZ |
95 | static double avg_stats(struct stats *stats) |
96 | { | |
8a02631a | 97 | return stats->mean; |
506d4bc8 | 98 | } |
42202dd5 | 99 | |
506d4bc8 | 100 | /* |
63d40deb PZ |
101 | * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance |
102 | * | |
8a02631a PZ |
103 | * (\Sum n_i^2) - ((\Sum n_i)^2)/n |
104 | * s^2 = ------------------------------- | |
105 | * n - 1 | |
63d40deb PZ |
106 | * |
107 | * http://en.wikipedia.org/wiki/Stddev | |
108 | * | |
109 | * The std dev of the mean is related to the std dev by: | |
110 | * | |
111 | * s | |
112 | * s_mean = ------- | |
113 | * sqrt(n) | |
114 | * | |
506d4bc8 PZ |
115 | */ |
116 | static double stddev_stats(struct stats *stats) | |
117 | { | |
8a02631a PZ |
118 | double variance = stats->M2 / (stats->n - 1); |
119 | double variance_mean = variance / stats->n; | |
42202dd5 | 120 | |
63d40deb | 121 | return sqrt(variance_mean); |
506d4bc8 | 122 | } |
42202dd5 | 123 | |
506d4bc8 | 124 | struct stats event_res_stats[MAX_COUNTERS][3]; |
506d4bc8 PZ |
125 | struct stats runtime_nsecs_stats; |
126 | struct stats walltime_nsecs_stats; | |
127 | struct stats runtime_cycles_stats; | |
be1ac0d8 | 128 | |
b9ebdcc0 JSR |
129 | #define MATCH_EVENT(t, c, counter) \ |
130 | (attrs[counter].type == PERF_TYPE_##t && \ | |
131 | attrs[counter].config == PERF_COUNT_##c) | |
132 | ||
cca03c0a | 133 | #define ERR_PERF_OPEN \ |
cdd6c482 | 134 | "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n" |
cca03c0a | 135 | |
051ae7f7 | 136 | static void create_perf_stat_counter(int counter, int pid) |
ddcacfa0 | 137 | { |
cdd6c482 | 138 | struct perf_event_attr *attr = attrs + counter; |
16c8a109 | 139 | |
ddcacfa0 | 140 | if (scale) |
a21ca2ca IM |
141 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
142 | PERF_FORMAT_TOTAL_TIME_RUNNING; | |
ddcacfa0 IM |
143 | |
144 | if (system_wide) { | |
f37a291c IM |
145 | unsigned int cpu; |
146 | ||
cca03c0a | 147 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
cdd6c482 | 148 | fd[cpu][counter] = sys_perf_event_open(attr, -1, cpu, -1, 0); |
cca03c0a JSR |
149 | if (fd[cpu][counter] < 0 && verbose) |
150 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
151 | fd[cpu][counter], strerror(errno)); | |
ddcacfa0 IM |
152 | } |
153 | } else { | |
57e7986e PM |
154 | attr->inherit = inherit; |
155 | attr->disabled = 1; | |
156 | attr->enable_on_exec = 1; | |
ddcacfa0 | 157 | |
cdd6c482 | 158 | fd[0][counter] = sys_perf_event_open(attr, pid, -1, -1, 0); |
cca03c0a JSR |
159 | if (fd[0][counter] < 0 && verbose) |
160 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
161 | fd[0][counter], strerror(errno)); | |
ddcacfa0 IM |
162 | } |
163 | } | |
164 | ||
c04f5e5d IM |
165 | /* |
166 | * Does the counter have nsecs as a unit? | |
167 | */ | |
168 | static inline int nsec_counter(int counter) | |
169 | { | |
b9ebdcc0 JSR |
170 | if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) || |
171 | MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) | |
c04f5e5d IM |
172 | return 1; |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
177 | /* | |
2996f5dd | 178 | * Read out the results of a single counter: |
c04f5e5d | 179 | */ |
2996f5dd | 180 | static void read_counter(int counter) |
c04f5e5d | 181 | { |
849abde9 | 182 | u64 count[3], single_count[3]; |
f37a291c IM |
183 | unsigned int cpu; |
184 | size_t res, nv; | |
c04f5e5d | 185 | int scaled; |
9e9772c4 | 186 | int i; |
c04f5e5d IM |
187 | |
188 | count[0] = count[1] = count[2] = 0; | |
2996f5dd | 189 | |
c04f5e5d | 190 | nv = scale ? 3 : 1; |
cca03c0a | 191 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
743ee1f8 IM |
192 | if (fd[cpu][counter] < 0) |
193 | continue; | |
194 | ||
9cffa8d5 PM |
195 | res = read(fd[cpu][counter], single_count, nv * sizeof(u64)); |
196 | assert(res == nv * sizeof(u64)); | |
f37a291c | 197 | |
42202dd5 IM |
198 | close(fd[cpu][counter]); |
199 | fd[cpu][counter] = -1; | |
c04f5e5d IM |
200 | |
201 | count[0] += single_count[0]; | |
202 | if (scale) { | |
203 | count[1] += single_count[1]; | |
204 | count[2] += single_count[2]; | |
205 | } | |
206 | } | |
207 | ||
208 | scaled = 0; | |
209 | if (scale) { | |
210 | if (count[2] == 0) { | |
9e9772c4 | 211 | event_scaled[counter] = -1; |
2996f5dd | 212 | count[0] = 0; |
c04f5e5d IM |
213 | return; |
214 | } | |
2996f5dd | 215 | |
c04f5e5d | 216 | if (count[2] < count[1]) { |
9e9772c4 | 217 | event_scaled[counter] = 1; |
c04f5e5d IM |
218 | count[0] = (unsigned long long) |
219 | ((double)count[0] * count[1] / count[2] + 0.5); | |
220 | } | |
221 | } | |
9e9772c4 PZ |
222 | |
223 | for (i = 0; i < 3; i++) | |
224 | update_stats(&event_res_stats[counter][i], count[i]); | |
225 | ||
226 | if (verbose) { | |
227 | fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter), | |
228 | count[0], count[1], count[2]); | |
229 | } | |
230 | ||
be1ac0d8 IM |
231 | /* |
232 | * Save the full runtime - to allow normalization during printout: | |
233 | */ | |
b9ebdcc0 | 234 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) |
9e9772c4 | 235 | update_stats(&runtime_nsecs_stats, count[0]); |
b9ebdcc0 | 236 | if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) |
9e9772c4 | 237 | update_stats(&runtime_cycles_stats, count[0]); |
2996f5dd IM |
238 | } |
239 | ||
f37a291c | 240 | static int run_perf_stat(int argc __used, const char **argv) |
42202dd5 IM |
241 | { |
242 | unsigned long long t0, t1; | |
243 | int status = 0; | |
244 | int counter; | |
245 | int pid; | |
051ae7f7 PM |
246 | int child_ready_pipe[2], go_pipe[2]; |
247 | char buf; | |
42202dd5 IM |
248 | |
249 | if (!system_wide) | |
250 | nr_cpus = 1; | |
251 | ||
051ae7f7 PM |
252 | if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) { |
253 | perror("failed to create pipes"); | |
254 | exit(1); | |
255 | } | |
256 | ||
257 | if ((pid = fork()) < 0) | |
258 | perror("failed to fork"); | |
259 | ||
260 | if (!pid) { | |
261 | close(child_ready_pipe[0]); | |
262 | close(go_pipe[1]); | |
263 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
264 | ||
265 | /* | |
266 | * Do a dummy execvp to get the PLT entry resolved, | |
267 | * so we avoid the resolver overhead on the real | |
268 | * execvp call. | |
269 | */ | |
270 | execvp("", (char **)argv); | |
271 | ||
272 | /* | |
273 | * Tell the parent we're ready to go | |
274 | */ | |
275 | close(child_ready_pipe[1]); | |
276 | ||
277 | /* | |
278 | * Wait until the parent tells us to go. | |
279 | */ | |
a92bef0f FW |
280 | if (read(go_pipe[0], &buf, 1) == -1) |
281 | perror("unable to read pipe"); | |
051ae7f7 PM |
282 | |
283 | execvp(argv[0], (char **)argv); | |
284 | ||
285 | perror(argv[0]); | |
286 | exit(-1); | |
287 | } | |
288 | ||
933da83a CW |
289 | child_pid = pid; |
290 | ||
051ae7f7 PM |
291 | /* |
292 | * Wait for the child to be ready to exec. | |
293 | */ | |
294 | close(child_ready_pipe[1]); | |
295 | close(go_pipe[0]); | |
a92bef0f FW |
296 | if (read(child_ready_pipe[0], &buf, 1) == -1) |
297 | perror("unable to read pipe"); | |
051ae7f7 PM |
298 | close(child_ready_pipe[0]); |
299 | ||
42202dd5 | 300 | for (counter = 0; counter < nr_counters; counter++) |
051ae7f7 | 301 | create_perf_stat_counter(counter, pid); |
42202dd5 IM |
302 | |
303 | /* | |
304 | * Enable counters and exec the command: | |
305 | */ | |
306 | t0 = rdclock(); | |
42202dd5 | 307 | |
051ae7f7 | 308 | close(go_pipe[1]); |
42202dd5 IM |
309 | wait(&status); |
310 | ||
42202dd5 IM |
311 | t1 = rdclock(); |
312 | ||
9e9772c4 | 313 | update_stats(&walltime_nsecs_stats, t1 - t0); |
42202dd5 IM |
314 | |
315 | for (counter = 0; counter < nr_counters; counter++) | |
316 | read_counter(counter); | |
317 | ||
318 | return WEXITSTATUS(status); | |
319 | } | |
320 | ||
849abde9 | 321 | static void print_noise(int counter, double avg) |
42202dd5 | 322 | { |
849abde9 PZ |
323 | if (run_count == 1) |
324 | return; | |
325 | ||
326 | fprintf(stderr, " ( +- %7.3f%% )", | |
327 | 100 * stddev_stats(&event_res_stats[counter][0]) / avg); | |
42202dd5 IM |
328 | } |
329 | ||
849abde9 | 330 | static void nsec_printout(int counter, double avg) |
44175b6f | 331 | { |
506d4bc8 | 332 | double msecs = avg / 1e6; |
44175b6f | 333 | |
6e750a8f | 334 | fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter)); |
44175b6f | 335 | |
b9ebdcc0 | 336 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) { |
506d4bc8 PZ |
337 | fprintf(stderr, " # %10.3f CPUs ", |
338 | avg / avg_stats(&walltime_nsecs_stats)); | |
44175b6f IM |
339 | } |
340 | } | |
341 | ||
849abde9 | 342 | static void abs_printout(int counter, double avg) |
44175b6f | 343 | { |
c7f7fea3 IM |
344 | double total, ratio = 0.0; |
345 | ||
506d4bc8 | 346 | fprintf(stderr, " %14.0f %-24s", avg, event_name(counter)); |
44175b6f | 347 | |
506d4bc8 | 348 | if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) { |
c7f7fea3 IM |
349 | total = avg_stats(&runtime_cycles_stats); |
350 | ||
351 | if (total) | |
352 | ratio = avg / total; | |
353 | ||
354 | fprintf(stderr, " # %10.3f IPC ", ratio); | |
42202dd5 | 355 | } else { |
c7f7fea3 IM |
356 | total = avg_stats(&runtime_nsecs_stats); |
357 | ||
358 | if (total) | |
359 | ratio = 1000.0 * avg / total; | |
360 | ||
361 | fprintf(stderr, " # %10.3f M/sec", ratio); | |
44175b6f | 362 | } |
44175b6f IM |
363 | } |
364 | ||
2996f5dd IM |
365 | /* |
366 | * Print out the results of a single counter: | |
367 | */ | |
368 | static void print_counter(int counter) | |
369 | { | |
849abde9 | 370 | double avg = avg_stats(&event_res_stats[counter][0]); |
63d40deb | 371 | int scaled = event_scaled[counter]; |
2996f5dd | 372 | |
2996f5dd | 373 | if (scaled == -1) { |
6e750a8f | 374 | fprintf(stderr, " %14s %-24s\n", |
2996f5dd IM |
375 | "<not counted>", event_name(counter)); |
376 | return; | |
377 | } | |
c04f5e5d | 378 | |
44175b6f | 379 | if (nsec_counter(counter)) |
849abde9 | 380 | nsec_printout(counter, avg); |
44175b6f | 381 | else |
849abde9 PZ |
382 | abs_printout(counter, avg); |
383 | ||
384 | print_noise(counter, avg); | |
506d4bc8 PZ |
385 | |
386 | if (scaled) { | |
387 | double avg_enabled, avg_running; | |
388 | ||
389 | avg_enabled = avg_stats(&event_res_stats[counter][1]); | |
390 | avg_running = avg_stats(&event_res_stats[counter][2]); | |
d7c29318 | 391 | |
210ad39f | 392 | fprintf(stderr, " (scaled from %.2f%%)", |
506d4bc8 PZ |
393 | 100 * avg_running / avg_enabled); |
394 | } | |
44175b6f | 395 | |
c04f5e5d IM |
396 | fprintf(stderr, "\n"); |
397 | } | |
398 | ||
42202dd5 IM |
399 | static void print_stat(int argc, const char **argv) |
400 | { | |
401 | int i, counter; | |
402 | ||
ddcacfa0 IM |
403 | fflush(stdout); |
404 | ||
405 | fprintf(stderr, "\n"); | |
44db76c8 IM |
406 | fprintf(stderr, " Performance counter stats for \'%s", argv[0]); |
407 | ||
408 | for (i = 1; i < argc; i++) | |
409 | fprintf(stderr, " %s", argv[i]); | |
410 | ||
42202dd5 IM |
411 | fprintf(stderr, "\'"); |
412 | if (run_count > 1) | |
413 | fprintf(stderr, " (%d runs)", run_count); | |
414 | fprintf(stderr, ":\n\n"); | |
2996f5dd | 415 | |
c04f5e5d IM |
416 | for (counter = 0; counter < nr_counters; counter++) |
417 | print_counter(counter); | |
ddcacfa0 | 418 | |
ddcacfa0 | 419 | fprintf(stderr, "\n"); |
566747e6 | 420 | fprintf(stderr, " %14.9f seconds time elapsed", |
506d4bc8 | 421 | avg_stats(&walltime_nsecs_stats)/1e9); |
566747e6 IM |
422 | if (run_count > 1) { |
423 | fprintf(stderr, " ( +- %7.3f%% )", | |
506d4bc8 PZ |
424 | 100*stddev_stats(&walltime_nsecs_stats) / |
425 | avg_stats(&walltime_nsecs_stats)); | |
566747e6 IM |
426 | } |
427 | fprintf(stderr, "\n\n"); | |
ddcacfa0 IM |
428 | } |
429 | ||
f7b7c26e PZ |
430 | static volatile int signr = -1; |
431 | ||
5242519b | 432 | static void skip_signal(int signo) |
ddcacfa0 | 433 | { |
f7b7c26e PZ |
434 | signr = signo; |
435 | } | |
436 | ||
437 | static void sig_atexit(void) | |
438 | { | |
933da83a CW |
439 | if (child_pid != -1) |
440 | kill(child_pid, SIGTERM); | |
441 | ||
f7b7c26e PZ |
442 | if (signr == -1) |
443 | return; | |
444 | ||
445 | signal(signr, SIG_DFL); | |
446 | kill(getpid(), signr); | |
5242519b IM |
447 | } |
448 | ||
449 | static const char * const stat_usage[] = { | |
450 | "perf stat [<options>] <command>", | |
451 | NULL | |
452 | }; | |
453 | ||
5242519b IM |
454 | static const struct option options[] = { |
455 | OPT_CALLBACK('e', "event", NULL, "event", | |
86847b62 TG |
456 | "event selector. use 'perf list' to list available events", |
457 | parse_events), | |
5242519b IM |
458 | OPT_BOOLEAN('i', "inherit", &inherit, |
459 | "child tasks inherit counters"), | |
460 | OPT_INTEGER('p', "pid", &target_pid, | |
461 | "stat events on existing pid"), | |
462 | OPT_BOOLEAN('a', "all-cpus", &system_wide, | |
3d632595 | 463 | "system-wide collection from all CPUs"), |
b26bc5a7 | 464 | OPT_BOOLEAN('c', "scale", &scale, |
3d632595 | 465 | "scale/normalize counters"), |
743ee1f8 IM |
466 | OPT_BOOLEAN('v', "verbose", &verbose, |
467 | "be more verbose (show counter open errors, etc)"), | |
42202dd5 IM |
468 | OPT_INTEGER('r', "repeat", &run_count, |
469 | "repeat command and print average + stddev (max: 100)"), | |
0cfb7a13 IM |
470 | OPT_BOOLEAN('n', "null", &null_run, |
471 | "null run - dont start any counters"), | |
5242519b IM |
472 | OPT_END() |
473 | }; | |
474 | ||
f37a291c | 475 | int cmd_stat(int argc, const char **argv, const char *prefix __used) |
5242519b | 476 | { |
42202dd5 IM |
477 | int status; |
478 | ||
a0541234 AB |
479 | argc = parse_options(argc, argv, options, stat_usage, |
480 | PARSE_OPT_STOP_AT_NON_OPTION); | |
5242519b IM |
481 | if (!argc) |
482 | usage_with_options(stat_usage, options); | |
9e9772c4 | 483 | if (run_count <= 0) |
42202dd5 | 484 | usage_with_options(stat_usage, options); |
ddcacfa0 | 485 | |
c3043569 JSR |
486 | /* Set attrs and nr_counters if no event is selected and !null_run */ |
487 | if (!null_run && !nr_counters) { | |
488 | memcpy(attrs, default_attrs, sizeof(default_attrs)); | |
489 | nr_counters = ARRAY_SIZE(default_attrs); | |
490 | } | |
ddcacfa0 | 491 | |
ddcacfa0 IM |
492 | nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
493 | assert(nr_cpus <= MAX_NR_CPUS); | |
f37a291c | 494 | assert((int)nr_cpus >= 0); |
ddcacfa0 | 495 | |
58d7e993 IM |
496 | /* |
497 | * We dont want to block the signals - that would cause | |
498 | * child tasks to inherit that and Ctrl-C would not work. | |
499 | * What we want is for Ctrl-C to work in the exec()-ed | |
500 | * task, but being ignored by perf stat itself: | |
501 | */ | |
f7b7c26e | 502 | atexit(sig_atexit); |
58d7e993 IM |
503 | signal(SIGINT, skip_signal); |
504 | signal(SIGALRM, skip_signal); | |
505 | signal(SIGABRT, skip_signal); | |
506 | ||
42202dd5 IM |
507 | status = 0; |
508 | for (run_idx = 0; run_idx < run_count; run_idx++) { | |
509 | if (run_count != 1 && verbose) | |
3d632595 | 510 | fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1); |
42202dd5 IM |
511 | status = run_perf_stat(argc, argv); |
512 | } | |
513 | ||
514 | print_stat(argc, argv); | |
515 | ||
516 | return status; | |
ddcacfa0 | 517 | } |