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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" | |
60666c63 | 47 | #include "util/header.h" |
ddcacfa0 | 48 | |
ddcacfa0 | 49 | #include <sys/prctl.h> |
42202dd5 | 50 | #include <math.h> |
16c8a109 | 51 | |
cdd6c482 | 52 | static struct perf_event_attr default_attrs[] = { |
ddcacfa0 | 53 | |
56aab464 IM |
54 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK }, |
55 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES }, | |
56 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS }, | |
57 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS }, | |
f4dbfa8f | 58 | |
56aab464 IM |
59 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES }, |
60 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS }, | |
56aab464 IM |
61 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, |
62 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES }, | |
dd86e72a IM |
63 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES }, |
64 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES }, | |
f4dbfa8f | 65 | |
ddcacfa0 | 66 | }; |
5242519b | 67 | |
a21ca2ca | 68 | static int system_wide = 0; |
f37a291c | 69 | static unsigned int nr_cpus = 0; |
3d632595 | 70 | static int run_idx = 0; |
ddcacfa0 | 71 | |
3d632595 JSR |
72 | static int run_count = 1; |
73 | static int inherit = 1; | |
66cf7829 | 74 | static int scale = 1; |
933da83a CW |
75 | static pid_t target_pid = -1; |
76 | static pid_t child_pid = -1; | |
0cfb7a13 | 77 | static int null_run = 0; |
ddcacfa0 | 78 | |
3d632595 | 79 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; |
42202dd5 | 80 | |
63d40deb | 81 | static int event_scaled[MAX_COUNTERS]; |
3d632595 | 82 | |
60666c63 LW |
83 | static volatile int done = 0; |
84 | ||
506d4bc8 PZ |
85 | struct stats |
86 | { | |
8a02631a | 87 | double n, mean, M2; |
506d4bc8 | 88 | }; |
42202dd5 | 89 | |
9e9772c4 PZ |
90 | static void update_stats(struct stats *stats, u64 val) |
91 | { | |
8a02631a | 92 | double delta; |
9e9772c4 | 93 | |
8a02631a PZ |
94 | stats->n++; |
95 | delta = val - stats->mean; | |
96 | stats->mean += delta / stats->n; | |
97 | stats->M2 += delta*(val - stats->mean); | |
9e9772c4 PZ |
98 | } |
99 | ||
506d4bc8 PZ |
100 | static double avg_stats(struct stats *stats) |
101 | { | |
8a02631a | 102 | return stats->mean; |
506d4bc8 | 103 | } |
42202dd5 | 104 | |
506d4bc8 | 105 | /* |
63d40deb PZ |
106 | * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance |
107 | * | |
8a02631a PZ |
108 | * (\Sum n_i^2) - ((\Sum n_i)^2)/n |
109 | * s^2 = ------------------------------- | |
110 | * n - 1 | |
63d40deb PZ |
111 | * |
112 | * http://en.wikipedia.org/wiki/Stddev | |
113 | * | |
114 | * The std dev of the mean is related to the std dev by: | |
115 | * | |
116 | * s | |
117 | * s_mean = ------- | |
118 | * sqrt(n) | |
119 | * | |
506d4bc8 PZ |
120 | */ |
121 | static double stddev_stats(struct stats *stats) | |
122 | { | |
8a02631a PZ |
123 | double variance = stats->M2 / (stats->n - 1); |
124 | double variance_mean = variance / stats->n; | |
42202dd5 | 125 | |
63d40deb | 126 | return sqrt(variance_mean); |
506d4bc8 | 127 | } |
42202dd5 | 128 | |
506d4bc8 | 129 | struct stats event_res_stats[MAX_COUNTERS][3]; |
506d4bc8 PZ |
130 | struct stats runtime_nsecs_stats; |
131 | struct stats walltime_nsecs_stats; | |
132 | struct stats runtime_cycles_stats; | |
11018201 | 133 | struct stats runtime_branches_stats; |
be1ac0d8 | 134 | |
b9ebdcc0 JSR |
135 | #define MATCH_EVENT(t, c, counter) \ |
136 | (attrs[counter].type == PERF_TYPE_##t && \ | |
137 | attrs[counter].config == PERF_COUNT_##c) | |
138 | ||
cca03c0a | 139 | #define ERR_PERF_OPEN \ |
cdd6c482 | 140 | "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n" |
cca03c0a | 141 | |
051ae7f7 | 142 | static void create_perf_stat_counter(int counter, int pid) |
ddcacfa0 | 143 | { |
cdd6c482 | 144 | struct perf_event_attr *attr = attrs + counter; |
16c8a109 | 145 | |
ddcacfa0 | 146 | if (scale) |
a21ca2ca IM |
147 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
148 | PERF_FORMAT_TOTAL_TIME_RUNNING; | |
ddcacfa0 IM |
149 | |
150 | if (system_wide) { | |
f37a291c IM |
151 | unsigned int cpu; |
152 | ||
cca03c0a | 153 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
cdd6c482 | 154 | fd[cpu][counter] = sys_perf_event_open(attr, -1, cpu, -1, 0); |
cca03c0a JSR |
155 | if (fd[cpu][counter] < 0 && verbose) |
156 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
157 | fd[cpu][counter], strerror(errno)); | |
ddcacfa0 IM |
158 | } |
159 | } else { | |
57e7986e PM |
160 | attr->inherit = inherit; |
161 | attr->disabled = 1; | |
162 | attr->enable_on_exec = 1; | |
ddcacfa0 | 163 | |
cdd6c482 | 164 | fd[0][counter] = sys_perf_event_open(attr, pid, -1, -1, 0); |
cca03c0a JSR |
165 | if (fd[0][counter] < 0 && verbose) |
166 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
167 | fd[0][counter], strerror(errno)); | |
ddcacfa0 IM |
168 | } |
169 | } | |
170 | ||
c04f5e5d IM |
171 | /* |
172 | * Does the counter have nsecs as a unit? | |
173 | */ | |
174 | static inline int nsec_counter(int counter) | |
175 | { | |
b9ebdcc0 JSR |
176 | if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) || |
177 | MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) | |
c04f5e5d IM |
178 | return 1; |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
2996f5dd | 184 | * Read out the results of a single counter: |
c04f5e5d | 185 | */ |
2996f5dd | 186 | static void read_counter(int counter) |
c04f5e5d | 187 | { |
849abde9 | 188 | u64 count[3], single_count[3]; |
f37a291c IM |
189 | unsigned int cpu; |
190 | size_t res, nv; | |
c04f5e5d | 191 | int scaled; |
9e9772c4 | 192 | int i; |
c04f5e5d IM |
193 | |
194 | count[0] = count[1] = count[2] = 0; | |
2996f5dd | 195 | |
c04f5e5d | 196 | nv = scale ? 3 : 1; |
cca03c0a | 197 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
743ee1f8 IM |
198 | if (fd[cpu][counter] < 0) |
199 | continue; | |
200 | ||
9cffa8d5 PM |
201 | res = read(fd[cpu][counter], single_count, nv * sizeof(u64)); |
202 | assert(res == nv * sizeof(u64)); | |
f37a291c | 203 | |
42202dd5 IM |
204 | close(fd[cpu][counter]); |
205 | fd[cpu][counter] = -1; | |
c04f5e5d IM |
206 | |
207 | count[0] += single_count[0]; | |
208 | if (scale) { | |
209 | count[1] += single_count[1]; | |
210 | count[2] += single_count[2]; | |
211 | } | |
212 | } | |
213 | ||
214 | scaled = 0; | |
215 | if (scale) { | |
216 | if (count[2] == 0) { | |
9e9772c4 | 217 | event_scaled[counter] = -1; |
2996f5dd | 218 | count[0] = 0; |
c04f5e5d IM |
219 | return; |
220 | } | |
2996f5dd | 221 | |
c04f5e5d | 222 | if (count[2] < count[1]) { |
9e9772c4 | 223 | event_scaled[counter] = 1; |
c04f5e5d IM |
224 | count[0] = (unsigned long long) |
225 | ((double)count[0] * count[1] / count[2] + 0.5); | |
226 | } | |
227 | } | |
9e9772c4 PZ |
228 | |
229 | for (i = 0; i < 3; i++) | |
230 | update_stats(&event_res_stats[counter][i], count[i]); | |
231 | ||
232 | if (verbose) { | |
233 | fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter), | |
234 | count[0], count[1], count[2]); | |
235 | } | |
236 | ||
be1ac0d8 IM |
237 | /* |
238 | * Save the full runtime - to allow normalization during printout: | |
239 | */ | |
b9ebdcc0 | 240 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) |
9e9772c4 | 241 | update_stats(&runtime_nsecs_stats, count[0]); |
b9ebdcc0 | 242 | if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) |
9e9772c4 | 243 | update_stats(&runtime_cycles_stats, count[0]); |
11018201 AB |
244 | if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter)) |
245 | update_stats(&runtime_branches_stats, count[0]); | |
2996f5dd IM |
246 | } |
247 | ||
f37a291c | 248 | static int run_perf_stat(int argc __used, const char **argv) |
42202dd5 IM |
249 | { |
250 | unsigned long long t0, t1; | |
251 | int status = 0; | |
252 | int counter; | |
60666c63 | 253 | int pid = target_pid; |
051ae7f7 | 254 | int child_ready_pipe[2], go_pipe[2]; |
60666c63 | 255 | const bool forks = (target_pid == -1 && argc > 0); |
051ae7f7 | 256 | char buf; |
42202dd5 IM |
257 | |
258 | if (!system_wide) | |
259 | nr_cpus = 1; | |
260 | ||
60666c63 | 261 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
051ae7f7 PM |
262 | perror("failed to create pipes"); |
263 | exit(1); | |
264 | } | |
265 | ||
60666c63 LW |
266 | if (forks) { |
267 | if ((pid = fork()) < 0) | |
268 | perror("failed to fork"); | |
269 | ||
270 | if (!pid) { | |
271 | close(child_ready_pipe[0]); | |
272 | close(go_pipe[1]); | |
273 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
274 | ||
275 | /* | |
276 | * Do a dummy execvp to get the PLT entry resolved, | |
277 | * so we avoid the resolver overhead on the real | |
278 | * execvp call. | |
279 | */ | |
280 | execvp("", (char **)argv); | |
281 | ||
282 | /* | |
283 | * Tell the parent we're ready to go | |
284 | */ | |
285 | close(child_ready_pipe[1]); | |
286 | ||
287 | /* | |
288 | * Wait until the parent tells us to go. | |
289 | */ | |
290 | if (read(go_pipe[0], &buf, 1) == -1) | |
291 | perror("unable to read pipe"); | |
292 | ||
293 | execvp(argv[0], (char **)argv); | |
294 | ||
295 | perror(argv[0]); | |
296 | exit(-1); | |
297 | } | |
051ae7f7 | 298 | |
60666c63 | 299 | child_pid = pid; |
051ae7f7 PM |
300 | |
301 | /* | |
60666c63 | 302 | * Wait for the child to be ready to exec. |
051ae7f7 PM |
303 | */ |
304 | close(child_ready_pipe[1]); | |
60666c63 LW |
305 | close(go_pipe[0]); |
306 | if (read(child_ready_pipe[0], &buf, 1) == -1) | |
a92bef0f | 307 | perror("unable to read pipe"); |
60666c63 | 308 | close(child_ready_pipe[0]); |
051ae7f7 PM |
309 | } |
310 | ||
42202dd5 | 311 | for (counter = 0; counter < nr_counters; counter++) |
051ae7f7 | 312 | create_perf_stat_counter(counter, pid); |
42202dd5 IM |
313 | |
314 | /* | |
315 | * Enable counters and exec the command: | |
316 | */ | |
317 | t0 = rdclock(); | |
42202dd5 | 318 | |
60666c63 LW |
319 | if (forks) { |
320 | close(go_pipe[1]); | |
321 | wait(&status); | |
322 | } else { | |
323 | while(!done); | |
324 | } | |
42202dd5 | 325 | |
42202dd5 IM |
326 | t1 = rdclock(); |
327 | ||
9e9772c4 | 328 | update_stats(&walltime_nsecs_stats, t1 - t0); |
42202dd5 IM |
329 | |
330 | for (counter = 0; counter < nr_counters; counter++) | |
331 | read_counter(counter); | |
332 | ||
333 | return WEXITSTATUS(status); | |
334 | } | |
335 | ||
849abde9 | 336 | static void print_noise(int counter, double avg) |
42202dd5 | 337 | { |
849abde9 PZ |
338 | if (run_count == 1) |
339 | return; | |
340 | ||
341 | fprintf(stderr, " ( +- %7.3f%% )", | |
342 | 100 * stddev_stats(&event_res_stats[counter][0]) / avg); | |
42202dd5 IM |
343 | } |
344 | ||
849abde9 | 345 | static void nsec_printout(int counter, double avg) |
44175b6f | 346 | { |
506d4bc8 | 347 | double msecs = avg / 1e6; |
44175b6f | 348 | |
6e750a8f | 349 | fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter)); |
44175b6f | 350 | |
b9ebdcc0 | 351 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) { |
506d4bc8 PZ |
352 | fprintf(stderr, " # %10.3f CPUs ", |
353 | avg / avg_stats(&walltime_nsecs_stats)); | |
44175b6f IM |
354 | } |
355 | } | |
356 | ||
849abde9 | 357 | static void abs_printout(int counter, double avg) |
44175b6f | 358 | { |
c7f7fea3 IM |
359 | double total, ratio = 0.0; |
360 | ||
506d4bc8 | 361 | fprintf(stderr, " %14.0f %-24s", avg, event_name(counter)); |
44175b6f | 362 | |
506d4bc8 | 363 | if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) { |
c7f7fea3 IM |
364 | total = avg_stats(&runtime_cycles_stats); |
365 | ||
366 | if (total) | |
367 | ratio = avg / total; | |
368 | ||
369 | fprintf(stderr, " # %10.3f IPC ", ratio); | |
7255fe2a LDM |
370 | } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) && |
371 | runtime_branches_stats.n != 0) { | |
11018201 AB |
372 | total = avg_stats(&runtime_branches_stats); |
373 | ||
374 | if (total) | |
375 | ratio = avg * 100 / total; | |
376 | ||
dd86e72a | 377 | fprintf(stderr, " # %10.3f %% ", ratio); |
11018201 | 378 | |
7255fe2a | 379 | } else if (runtime_nsecs_stats.n != 0) { |
c7f7fea3 IM |
380 | total = avg_stats(&runtime_nsecs_stats); |
381 | ||
382 | if (total) | |
383 | ratio = 1000.0 * avg / total; | |
384 | ||
385 | fprintf(stderr, " # %10.3f M/sec", ratio); | |
44175b6f | 386 | } |
44175b6f IM |
387 | } |
388 | ||
2996f5dd IM |
389 | /* |
390 | * Print out the results of a single counter: | |
391 | */ | |
392 | static void print_counter(int counter) | |
393 | { | |
849abde9 | 394 | double avg = avg_stats(&event_res_stats[counter][0]); |
63d40deb | 395 | int scaled = event_scaled[counter]; |
2996f5dd | 396 | |
2996f5dd | 397 | if (scaled == -1) { |
6e750a8f | 398 | fprintf(stderr, " %14s %-24s\n", |
2996f5dd IM |
399 | "<not counted>", event_name(counter)); |
400 | return; | |
401 | } | |
c04f5e5d | 402 | |
44175b6f | 403 | if (nsec_counter(counter)) |
849abde9 | 404 | nsec_printout(counter, avg); |
44175b6f | 405 | else |
849abde9 PZ |
406 | abs_printout(counter, avg); |
407 | ||
408 | print_noise(counter, avg); | |
506d4bc8 PZ |
409 | |
410 | if (scaled) { | |
411 | double avg_enabled, avg_running; | |
412 | ||
413 | avg_enabled = avg_stats(&event_res_stats[counter][1]); | |
414 | avg_running = avg_stats(&event_res_stats[counter][2]); | |
d7c29318 | 415 | |
210ad39f | 416 | fprintf(stderr, " (scaled from %.2f%%)", |
506d4bc8 PZ |
417 | 100 * avg_running / avg_enabled); |
418 | } | |
44175b6f | 419 | |
c04f5e5d IM |
420 | fprintf(stderr, "\n"); |
421 | } | |
422 | ||
42202dd5 IM |
423 | static void print_stat(int argc, const char **argv) |
424 | { | |
425 | int i, counter; | |
426 | ||
ddcacfa0 IM |
427 | fflush(stdout); |
428 | ||
429 | fprintf(stderr, "\n"); | |
60666c63 LW |
430 | fprintf(stderr, " Performance counter stats for "); |
431 | if(target_pid == -1) { | |
432 | fprintf(stderr, "\'%s", argv[0]); | |
433 | for (i = 1; i < argc; i++) | |
434 | fprintf(stderr, " %s", argv[i]); | |
435 | }else | |
436 | fprintf(stderr, "task pid \'%d", target_pid); | |
44db76c8 | 437 | |
42202dd5 IM |
438 | fprintf(stderr, "\'"); |
439 | if (run_count > 1) | |
440 | fprintf(stderr, " (%d runs)", run_count); | |
441 | fprintf(stderr, ":\n\n"); | |
2996f5dd | 442 | |
c04f5e5d IM |
443 | for (counter = 0; counter < nr_counters; counter++) |
444 | print_counter(counter); | |
ddcacfa0 | 445 | |
ddcacfa0 | 446 | fprintf(stderr, "\n"); |
566747e6 | 447 | fprintf(stderr, " %14.9f seconds time elapsed", |
506d4bc8 | 448 | avg_stats(&walltime_nsecs_stats)/1e9); |
566747e6 IM |
449 | if (run_count > 1) { |
450 | fprintf(stderr, " ( +- %7.3f%% )", | |
506d4bc8 PZ |
451 | 100*stddev_stats(&walltime_nsecs_stats) / |
452 | avg_stats(&walltime_nsecs_stats)); | |
566747e6 IM |
453 | } |
454 | fprintf(stderr, "\n\n"); | |
ddcacfa0 IM |
455 | } |
456 | ||
f7b7c26e PZ |
457 | static volatile int signr = -1; |
458 | ||
5242519b | 459 | static void skip_signal(int signo) |
ddcacfa0 | 460 | { |
60666c63 LW |
461 | if(target_pid != -1) |
462 | done = 1; | |
463 | ||
f7b7c26e PZ |
464 | signr = signo; |
465 | } | |
466 | ||
467 | static void sig_atexit(void) | |
468 | { | |
933da83a CW |
469 | if (child_pid != -1) |
470 | kill(child_pid, SIGTERM); | |
471 | ||
f7b7c26e PZ |
472 | if (signr == -1) |
473 | return; | |
474 | ||
475 | signal(signr, SIG_DFL); | |
476 | kill(getpid(), signr); | |
5242519b IM |
477 | } |
478 | ||
479 | static const char * const stat_usage[] = { | |
60666c63 | 480 | "perf stat [<options>] [<command>]", |
5242519b IM |
481 | NULL |
482 | }; | |
483 | ||
5242519b IM |
484 | static const struct option options[] = { |
485 | OPT_CALLBACK('e', "event", NULL, "event", | |
86847b62 TG |
486 | "event selector. use 'perf list' to list available events", |
487 | parse_events), | |
5242519b IM |
488 | OPT_BOOLEAN('i', "inherit", &inherit, |
489 | "child tasks inherit counters"), | |
490 | OPT_INTEGER('p', "pid", &target_pid, | |
491 | "stat events on existing pid"), | |
492 | OPT_BOOLEAN('a', "all-cpus", &system_wide, | |
3d632595 | 493 | "system-wide collection from all CPUs"), |
b26bc5a7 | 494 | OPT_BOOLEAN('c', "scale", &scale, |
3d632595 | 495 | "scale/normalize counters"), |
743ee1f8 IM |
496 | OPT_BOOLEAN('v', "verbose", &verbose, |
497 | "be more verbose (show counter open errors, etc)"), | |
42202dd5 IM |
498 | OPT_INTEGER('r', "repeat", &run_count, |
499 | "repeat command and print average + stddev (max: 100)"), | |
0cfb7a13 IM |
500 | OPT_BOOLEAN('n', "null", &null_run, |
501 | "null run - dont start any counters"), | |
5242519b IM |
502 | OPT_END() |
503 | }; | |
504 | ||
f37a291c | 505 | int cmd_stat(int argc, const char **argv, const char *prefix __used) |
5242519b | 506 | { |
42202dd5 IM |
507 | int status; |
508 | ||
a0541234 AB |
509 | argc = parse_options(argc, argv, options, stat_usage, |
510 | PARSE_OPT_STOP_AT_NON_OPTION); | |
60666c63 | 511 | if (!argc && target_pid == -1) |
5242519b | 512 | usage_with_options(stat_usage, options); |
9e9772c4 | 513 | if (run_count <= 0) |
42202dd5 | 514 | usage_with_options(stat_usage, options); |
ddcacfa0 | 515 | |
c3043569 JSR |
516 | /* Set attrs and nr_counters if no event is selected and !null_run */ |
517 | if (!null_run && !nr_counters) { | |
518 | memcpy(attrs, default_attrs, sizeof(default_attrs)); | |
519 | nr_counters = ARRAY_SIZE(default_attrs); | |
520 | } | |
ddcacfa0 | 521 | |
ddcacfa0 IM |
522 | nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
523 | assert(nr_cpus <= MAX_NR_CPUS); | |
f37a291c | 524 | assert((int)nr_cpus >= 0); |
ddcacfa0 | 525 | |
58d7e993 IM |
526 | /* |
527 | * We dont want to block the signals - that would cause | |
528 | * child tasks to inherit that and Ctrl-C would not work. | |
529 | * What we want is for Ctrl-C to work in the exec()-ed | |
530 | * task, but being ignored by perf stat itself: | |
531 | */ | |
f7b7c26e | 532 | atexit(sig_atexit); |
58d7e993 IM |
533 | signal(SIGINT, skip_signal); |
534 | signal(SIGALRM, skip_signal); | |
535 | signal(SIGABRT, skip_signal); | |
536 | ||
42202dd5 IM |
537 | status = 0; |
538 | for (run_idx = 0; run_idx < run_count; run_idx++) { | |
539 | if (run_count != 1 && verbose) | |
3d632595 | 540 | fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1); |
42202dd5 IM |
541 | status = run_perf_stat(argc, argv); |
542 | } | |
543 | ||
544 | print_stat(argc, argv); | |
545 | ||
546 | return status; | |
ddcacfa0 | 547 | } |