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Commit | Line | Data |
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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 }, | |
12133aff TB |
62 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS}, |
63 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES }, | |
f4dbfa8f | 64 | |
ddcacfa0 | 65 | }; |
5242519b | 66 | |
a21ca2ca | 67 | static int system_wide = 0; |
f37a291c | 68 | static unsigned int nr_cpus = 0; |
3d632595 | 69 | static int run_idx = 0; |
ddcacfa0 | 70 | |
3d632595 JSR |
71 | static int run_count = 1; |
72 | static int inherit = 1; | |
66cf7829 | 73 | static int scale = 1; |
933da83a CW |
74 | static pid_t target_pid = -1; |
75 | static pid_t child_pid = -1; | |
0cfb7a13 | 76 | static int null_run = 0; |
ddcacfa0 | 77 | |
3d632595 | 78 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; |
42202dd5 | 79 | |
63d40deb | 80 | static int event_scaled[MAX_COUNTERS]; |
3d632595 | 81 | |
506d4bc8 PZ |
82 | struct stats |
83 | { | |
8a02631a | 84 | double n, mean, M2; |
506d4bc8 | 85 | }; |
42202dd5 | 86 | |
9e9772c4 PZ |
87 | static void update_stats(struct stats *stats, u64 val) |
88 | { | |
8a02631a | 89 | double delta; |
9e9772c4 | 90 | |
8a02631a PZ |
91 | stats->n++; |
92 | delta = val - stats->mean; | |
93 | stats->mean += delta / stats->n; | |
94 | stats->M2 += delta*(val - stats->mean); | |
9e9772c4 PZ |
95 | } |
96 | ||
506d4bc8 PZ |
97 | static double avg_stats(struct stats *stats) |
98 | { | |
8a02631a | 99 | return stats->mean; |
506d4bc8 | 100 | } |
42202dd5 | 101 | |
506d4bc8 | 102 | /* |
63d40deb PZ |
103 | * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance |
104 | * | |
8a02631a PZ |
105 | * (\Sum n_i^2) - ((\Sum n_i)^2)/n |
106 | * s^2 = ------------------------------- | |
107 | * n - 1 | |
63d40deb PZ |
108 | * |
109 | * http://en.wikipedia.org/wiki/Stddev | |
110 | * | |
111 | * The std dev of the mean is related to the std dev by: | |
112 | * | |
113 | * s | |
114 | * s_mean = ------- | |
115 | * sqrt(n) | |
116 | * | |
506d4bc8 PZ |
117 | */ |
118 | static double stddev_stats(struct stats *stats) | |
119 | { | |
8a02631a PZ |
120 | double variance = stats->M2 / (stats->n - 1); |
121 | double variance_mean = variance / stats->n; | |
42202dd5 | 122 | |
63d40deb | 123 | return sqrt(variance_mean); |
506d4bc8 | 124 | } |
42202dd5 | 125 | |
506d4bc8 | 126 | struct stats event_res_stats[MAX_COUNTERS][3]; |
506d4bc8 PZ |
127 | struct stats runtime_nsecs_stats; |
128 | struct stats walltime_nsecs_stats; | |
129 | struct stats runtime_cycles_stats; | |
11018201 | 130 | struct stats runtime_branches_stats; |
be1ac0d8 | 131 | |
b9ebdcc0 JSR |
132 | #define MATCH_EVENT(t, c, counter) \ |
133 | (attrs[counter].type == PERF_TYPE_##t && \ | |
134 | attrs[counter].config == PERF_COUNT_##c) | |
135 | ||
cca03c0a | 136 | #define ERR_PERF_OPEN \ |
cdd6c482 | 137 | "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n" |
cca03c0a | 138 | |
051ae7f7 | 139 | static void create_perf_stat_counter(int counter, int pid) |
ddcacfa0 | 140 | { |
cdd6c482 | 141 | struct perf_event_attr *attr = attrs + counter; |
16c8a109 | 142 | |
ddcacfa0 | 143 | if (scale) |
a21ca2ca IM |
144 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
145 | PERF_FORMAT_TOTAL_TIME_RUNNING; | |
ddcacfa0 IM |
146 | |
147 | if (system_wide) { | |
f37a291c IM |
148 | unsigned int cpu; |
149 | ||
cca03c0a | 150 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
cdd6c482 | 151 | fd[cpu][counter] = sys_perf_event_open(attr, -1, cpu, -1, 0); |
cca03c0a JSR |
152 | if (fd[cpu][counter] < 0 && verbose) |
153 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
154 | fd[cpu][counter], strerror(errno)); | |
ddcacfa0 IM |
155 | } |
156 | } else { | |
57e7986e PM |
157 | attr->inherit = inherit; |
158 | attr->disabled = 1; | |
159 | attr->enable_on_exec = 1; | |
ddcacfa0 | 160 | |
cdd6c482 | 161 | fd[0][counter] = sys_perf_event_open(attr, pid, -1, -1, 0); |
cca03c0a JSR |
162 | if (fd[0][counter] < 0 && verbose) |
163 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
164 | fd[0][counter], strerror(errno)); | |
ddcacfa0 IM |
165 | } |
166 | } | |
167 | ||
c04f5e5d IM |
168 | /* |
169 | * Does the counter have nsecs as a unit? | |
170 | */ | |
171 | static inline int nsec_counter(int counter) | |
172 | { | |
b9ebdcc0 JSR |
173 | if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) || |
174 | MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) | |
c04f5e5d IM |
175 | return 1; |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
2996f5dd | 181 | * Read out the results of a single counter: |
c04f5e5d | 182 | */ |
2996f5dd | 183 | static void read_counter(int counter) |
c04f5e5d | 184 | { |
849abde9 | 185 | u64 count[3], single_count[3]; |
f37a291c IM |
186 | unsigned int cpu; |
187 | size_t res, nv; | |
c04f5e5d | 188 | int scaled; |
9e9772c4 | 189 | int i; |
c04f5e5d IM |
190 | |
191 | count[0] = count[1] = count[2] = 0; | |
2996f5dd | 192 | |
c04f5e5d | 193 | nv = scale ? 3 : 1; |
cca03c0a | 194 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
743ee1f8 IM |
195 | if (fd[cpu][counter] < 0) |
196 | continue; | |
197 | ||
9cffa8d5 PM |
198 | res = read(fd[cpu][counter], single_count, nv * sizeof(u64)); |
199 | assert(res == nv * sizeof(u64)); | |
f37a291c | 200 | |
42202dd5 IM |
201 | close(fd[cpu][counter]); |
202 | fd[cpu][counter] = -1; | |
c04f5e5d IM |
203 | |
204 | count[0] += single_count[0]; | |
205 | if (scale) { | |
206 | count[1] += single_count[1]; | |
207 | count[2] += single_count[2]; | |
208 | } | |
209 | } | |
210 | ||
211 | scaled = 0; | |
212 | if (scale) { | |
213 | if (count[2] == 0) { | |
9e9772c4 | 214 | event_scaled[counter] = -1; |
2996f5dd | 215 | count[0] = 0; |
c04f5e5d IM |
216 | return; |
217 | } | |
2996f5dd | 218 | |
c04f5e5d | 219 | if (count[2] < count[1]) { |
9e9772c4 | 220 | event_scaled[counter] = 1; |
c04f5e5d IM |
221 | count[0] = (unsigned long long) |
222 | ((double)count[0] * count[1] / count[2] + 0.5); | |
223 | } | |
224 | } | |
9e9772c4 PZ |
225 | |
226 | for (i = 0; i < 3; i++) | |
227 | update_stats(&event_res_stats[counter][i], count[i]); | |
228 | ||
229 | if (verbose) { | |
230 | fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter), | |
231 | count[0], count[1], count[2]); | |
232 | } | |
233 | ||
be1ac0d8 IM |
234 | /* |
235 | * Save the full runtime - to allow normalization during printout: | |
236 | */ | |
b9ebdcc0 | 237 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) |
9e9772c4 | 238 | update_stats(&runtime_nsecs_stats, count[0]); |
b9ebdcc0 | 239 | if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) |
9e9772c4 | 240 | update_stats(&runtime_cycles_stats, count[0]); |
11018201 AB |
241 | if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter)) |
242 | update_stats(&runtime_branches_stats, count[0]); | |
2996f5dd IM |
243 | } |
244 | ||
f37a291c | 245 | static int run_perf_stat(int argc __used, const char **argv) |
42202dd5 IM |
246 | { |
247 | unsigned long long t0, t1; | |
248 | int status = 0; | |
249 | int counter; | |
250 | int pid; | |
051ae7f7 PM |
251 | int child_ready_pipe[2], go_pipe[2]; |
252 | char buf; | |
42202dd5 IM |
253 | |
254 | if (!system_wide) | |
255 | nr_cpus = 1; | |
256 | ||
051ae7f7 PM |
257 | if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) { |
258 | perror("failed to create pipes"); | |
259 | exit(1); | |
260 | } | |
261 | ||
262 | if ((pid = fork()) < 0) | |
263 | perror("failed to fork"); | |
264 | ||
265 | if (!pid) { | |
266 | close(child_ready_pipe[0]); | |
267 | close(go_pipe[1]); | |
268 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
269 | ||
270 | /* | |
271 | * Do a dummy execvp to get the PLT entry resolved, | |
272 | * so we avoid the resolver overhead on the real | |
273 | * execvp call. | |
274 | */ | |
275 | execvp("", (char **)argv); | |
276 | ||
277 | /* | |
278 | * Tell the parent we're ready to go | |
279 | */ | |
280 | close(child_ready_pipe[1]); | |
281 | ||
282 | /* | |
283 | * Wait until the parent tells us to go. | |
284 | */ | |
a92bef0f FW |
285 | if (read(go_pipe[0], &buf, 1) == -1) |
286 | perror("unable to read pipe"); | |
051ae7f7 PM |
287 | |
288 | execvp(argv[0], (char **)argv); | |
289 | ||
290 | perror(argv[0]); | |
291 | exit(-1); | |
292 | } | |
293 | ||
933da83a CW |
294 | child_pid = pid; |
295 | ||
051ae7f7 PM |
296 | /* |
297 | * Wait for the child to be ready to exec. | |
298 | */ | |
299 | close(child_ready_pipe[1]); | |
300 | close(go_pipe[0]); | |
a92bef0f FW |
301 | if (read(child_ready_pipe[0], &buf, 1) == -1) |
302 | perror("unable to read pipe"); | |
051ae7f7 PM |
303 | close(child_ready_pipe[0]); |
304 | ||
42202dd5 | 305 | for (counter = 0; counter < nr_counters; counter++) |
051ae7f7 | 306 | create_perf_stat_counter(counter, pid); |
42202dd5 IM |
307 | |
308 | /* | |
309 | * Enable counters and exec the command: | |
310 | */ | |
311 | t0 = rdclock(); | |
42202dd5 | 312 | |
051ae7f7 | 313 | close(go_pipe[1]); |
42202dd5 IM |
314 | wait(&status); |
315 | ||
42202dd5 IM |
316 | t1 = rdclock(); |
317 | ||
9e9772c4 | 318 | update_stats(&walltime_nsecs_stats, t1 - t0); |
42202dd5 IM |
319 | |
320 | for (counter = 0; counter < nr_counters; counter++) | |
321 | read_counter(counter); | |
322 | ||
323 | return WEXITSTATUS(status); | |
324 | } | |
325 | ||
849abde9 | 326 | static void print_noise(int counter, double avg) |
42202dd5 | 327 | { |
849abde9 PZ |
328 | if (run_count == 1) |
329 | return; | |
330 | ||
331 | fprintf(stderr, " ( +- %7.3f%% )", | |
332 | 100 * stddev_stats(&event_res_stats[counter][0]) / avg); | |
42202dd5 IM |
333 | } |
334 | ||
849abde9 | 335 | static void nsec_printout(int counter, double avg) |
44175b6f | 336 | { |
506d4bc8 | 337 | double msecs = avg / 1e6; |
44175b6f | 338 | |
6e750a8f | 339 | fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter)); |
44175b6f | 340 | |
b9ebdcc0 | 341 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) { |
506d4bc8 PZ |
342 | fprintf(stderr, " # %10.3f CPUs ", |
343 | avg / avg_stats(&walltime_nsecs_stats)); | |
44175b6f IM |
344 | } |
345 | } | |
346 | ||
849abde9 | 347 | static void abs_printout(int counter, double avg) |
44175b6f | 348 | { |
c7f7fea3 IM |
349 | double total, ratio = 0.0; |
350 | ||
506d4bc8 | 351 | fprintf(stderr, " %14.0f %-24s", avg, event_name(counter)); |
44175b6f | 352 | |
506d4bc8 | 353 | if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) { |
c7f7fea3 IM |
354 | total = avg_stats(&runtime_cycles_stats); |
355 | ||
356 | if (total) | |
357 | ratio = avg / total; | |
358 | ||
359 | fprintf(stderr, " # %10.3f IPC ", ratio); | |
11018201 AB |
360 | } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter)) { |
361 | total = avg_stats(&runtime_branches_stats); | |
362 | ||
363 | if (total) | |
364 | ratio = avg * 100 / total; | |
365 | ||
366 | fprintf(stderr, " # %10.3f %% ", ratio); | |
367 | ||
42202dd5 | 368 | } else { |
c7f7fea3 IM |
369 | total = avg_stats(&runtime_nsecs_stats); |
370 | ||
371 | if (total) | |
372 | ratio = 1000.0 * avg / total; | |
373 | ||
374 | fprintf(stderr, " # %10.3f M/sec", ratio); | |
44175b6f | 375 | } |
44175b6f IM |
376 | } |
377 | ||
2996f5dd IM |
378 | /* |
379 | * Print out the results of a single counter: | |
380 | */ | |
381 | static void print_counter(int counter) | |
382 | { | |
849abde9 | 383 | double avg = avg_stats(&event_res_stats[counter][0]); |
63d40deb | 384 | int scaled = event_scaled[counter]; |
2996f5dd | 385 | |
2996f5dd | 386 | if (scaled == -1) { |
6e750a8f | 387 | fprintf(stderr, " %14s %-24s\n", |
2996f5dd IM |
388 | "<not counted>", event_name(counter)); |
389 | return; | |
390 | } | |
c04f5e5d | 391 | |
44175b6f | 392 | if (nsec_counter(counter)) |
849abde9 | 393 | nsec_printout(counter, avg); |
44175b6f | 394 | else |
849abde9 PZ |
395 | abs_printout(counter, avg); |
396 | ||
397 | print_noise(counter, avg); | |
506d4bc8 PZ |
398 | |
399 | if (scaled) { | |
400 | double avg_enabled, avg_running; | |
401 | ||
402 | avg_enabled = avg_stats(&event_res_stats[counter][1]); | |
403 | avg_running = avg_stats(&event_res_stats[counter][2]); | |
d7c29318 | 404 | |
210ad39f | 405 | fprintf(stderr, " (scaled from %.2f%%)", |
506d4bc8 PZ |
406 | 100 * avg_running / avg_enabled); |
407 | } | |
44175b6f | 408 | |
c04f5e5d IM |
409 | fprintf(stderr, "\n"); |
410 | } | |
411 | ||
42202dd5 IM |
412 | static void print_stat(int argc, const char **argv) |
413 | { | |
414 | int i, counter; | |
415 | ||
ddcacfa0 IM |
416 | fflush(stdout); |
417 | ||
418 | fprintf(stderr, "\n"); | |
44db76c8 IM |
419 | fprintf(stderr, " Performance counter stats for \'%s", argv[0]); |
420 | ||
421 | for (i = 1; i < argc; i++) | |
422 | fprintf(stderr, " %s", argv[i]); | |
423 | ||
42202dd5 IM |
424 | fprintf(stderr, "\'"); |
425 | if (run_count > 1) | |
426 | fprintf(stderr, " (%d runs)", run_count); | |
427 | fprintf(stderr, ":\n\n"); | |
2996f5dd | 428 | |
c04f5e5d IM |
429 | for (counter = 0; counter < nr_counters; counter++) |
430 | print_counter(counter); | |
ddcacfa0 | 431 | |
ddcacfa0 | 432 | fprintf(stderr, "\n"); |
566747e6 | 433 | fprintf(stderr, " %14.9f seconds time elapsed", |
506d4bc8 | 434 | avg_stats(&walltime_nsecs_stats)/1e9); |
566747e6 IM |
435 | if (run_count > 1) { |
436 | fprintf(stderr, " ( +- %7.3f%% )", | |
506d4bc8 PZ |
437 | 100*stddev_stats(&walltime_nsecs_stats) / |
438 | avg_stats(&walltime_nsecs_stats)); | |
566747e6 IM |
439 | } |
440 | fprintf(stderr, "\n\n"); | |
ddcacfa0 IM |
441 | } |
442 | ||
f7b7c26e PZ |
443 | static volatile int signr = -1; |
444 | ||
5242519b | 445 | static void skip_signal(int signo) |
ddcacfa0 | 446 | { |
f7b7c26e PZ |
447 | signr = signo; |
448 | } | |
449 | ||
450 | static void sig_atexit(void) | |
451 | { | |
933da83a CW |
452 | if (child_pid != -1) |
453 | kill(child_pid, SIGTERM); | |
454 | ||
f7b7c26e PZ |
455 | if (signr == -1) |
456 | return; | |
457 | ||
458 | signal(signr, SIG_DFL); | |
459 | kill(getpid(), signr); | |
5242519b IM |
460 | } |
461 | ||
462 | static const char * const stat_usage[] = { | |
463 | "perf stat [<options>] <command>", | |
464 | NULL | |
465 | }; | |
466 | ||
5242519b IM |
467 | static const struct option options[] = { |
468 | OPT_CALLBACK('e', "event", NULL, "event", | |
86847b62 TG |
469 | "event selector. use 'perf list' to list available events", |
470 | parse_events), | |
5242519b IM |
471 | OPT_BOOLEAN('i', "inherit", &inherit, |
472 | "child tasks inherit counters"), | |
473 | OPT_INTEGER('p', "pid", &target_pid, | |
474 | "stat events on existing pid"), | |
475 | OPT_BOOLEAN('a', "all-cpus", &system_wide, | |
3d632595 | 476 | "system-wide collection from all CPUs"), |
b26bc5a7 | 477 | OPT_BOOLEAN('c', "scale", &scale, |
3d632595 | 478 | "scale/normalize counters"), |
743ee1f8 IM |
479 | OPT_BOOLEAN('v', "verbose", &verbose, |
480 | "be more verbose (show counter open errors, etc)"), | |
42202dd5 IM |
481 | OPT_INTEGER('r', "repeat", &run_count, |
482 | "repeat command and print average + stddev (max: 100)"), | |
0cfb7a13 IM |
483 | OPT_BOOLEAN('n', "null", &null_run, |
484 | "null run - dont start any counters"), | |
5242519b IM |
485 | OPT_END() |
486 | }; | |
487 | ||
f37a291c | 488 | int cmd_stat(int argc, const char **argv, const char *prefix __used) |
5242519b | 489 | { |
42202dd5 IM |
490 | int status; |
491 | ||
a0541234 AB |
492 | argc = parse_options(argc, argv, options, stat_usage, |
493 | PARSE_OPT_STOP_AT_NON_OPTION); | |
5242519b IM |
494 | if (!argc) |
495 | usage_with_options(stat_usage, options); | |
9e9772c4 | 496 | if (run_count <= 0) |
42202dd5 | 497 | usage_with_options(stat_usage, options); |
ddcacfa0 | 498 | |
c3043569 JSR |
499 | /* Set attrs and nr_counters if no event is selected and !null_run */ |
500 | if (!null_run && !nr_counters) { | |
501 | memcpy(attrs, default_attrs, sizeof(default_attrs)); | |
502 | nr_counters = ARRAY_SIZE(default_attrs); | |
503 | } | |
ddcacfa0 | 504 | |
ddcacfa0 IM |
505 | nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
506 | assert(nr_cpus <= MAX_NR_CPUS); | |
f37a291c | 507 | assert((int)nr_cpus >= 0); |
ddcacfa0 | 508 | |
58d7e993 IM |
509 | /* |
510 | * We dont want to block the signals - that would cause | |
511 | * child tasks to inherit that and Ctrl-C would not work. | |
512 | * What we want is for Ctrl-C to work in the exec()-ed | |
513 | * task, but being ignored by perf stat itself: | |
514 | */ | |
f7b7c26e | 515 | atexit(sig_atexit); |
58d7e993 IM |
516 | signal(SIGINT, skip_signal); |
517 | signal(SIGALRM, skip_signal); | |
518 | signal(SIGABRT, skip_signal); | |
519 | ||
42202dd5 IM |
520 | status = 0; |
521 | for (run_idx = 0; run_idx < run_count; run_idx++) { | |
522 | if (run_count != 1 && verbose) | |
3d632595 | 523 | fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1); |
42202dd5 IM |
524 | status = run_perf_stat(argc, argv); |
525 | } | |
526 | ||
527 | print_stat(argc, argv); | |
528 | ||
529 | return status; | |
ddcacfa0 | 530 | } |