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" | |
60666c63 | 47 | #include "util/header.h" |
a12b51c4 | 48 | #include "util/cpumap.h" |
ddcacfa0 | 49 | |
ddcacfa0 | 50 | #include <sys/prctl.h> |
42202dd5 | 51 | #include <math.h> |
16c8a109 | 52 | |
cdd6c482 | 53 | static struct perf_event_attr default_attrs[] = { |
ddcacfa0 | 54 | |
56aab464 IM |
55 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK }, |
56 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES }, | |
57 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS }, | |
58 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS }, | |
f4dbfa8f | 59 | |
56aab464 IM |
60 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES }, |
61 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS }, | |
56aab464 IM |
62 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, |
63 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES }, | |
dd86e72a IM |
64 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES }, |
65 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES }, | |
f4dbfa8f | 66 | |
ddcacfa0 | 67 | }; |
5242519b | 68 | |
a21ca2ca | 69 | static int system_wide = 0; |
f37a291c | 70 | static unsigned int nr_cpus = 0; |
3d632595 | 71 | static int run_idx = 0; |
ddcacfa0 | 72 | |
3d632595 JSR |
73 | static int run_count = 1; |
74 | static int inherit = 1; | |
66cf7829 | 75 | static int scale = 1; |
933da83a CW |
76 | static pid_t target_pid = -1; |
77 | static pid_t child_pid = -1; | |
0cfb7a13 | 78 | static int null_run = 0; |
ddcacfa0 | 79 | |
3d632595 | 80 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; |
42202dd5 | 81 | |
63d40deb | 82 | static int event_scaled[MAX_COUNTERS]; |
3d632595 | 83 | |
60666c63 LW |
84 | static volatile int done = 0; |
85 | ||
506d4bc8 PZ |
86 | struct stats |
87 | { | |
8a02631a | 88 | double n, mean, M2; |
506d4bc8 | 89 | }; |
42202dd5 | 90 | |
9e9772c4 PZ |
91 | static void update_stats(struct stats *stats, u64 val) |
92 | { | |
8a02631a | 93 | double delta; |
9e9772c4 | 94 | |
8a02631a PZ |
95 | stats->n++; |
96 | delta = val - stats->mean; | |
97 | stats->mean += delta / stats->n; | |
98 | stats->M2 += delta*(val - stats->mean); | |
9e9772c4 PZ |
99 | } |
100 | ||
506d4bc8 PZ |
101 | static double avg_stats(struct stats *stats) |
102 | { | |
8a02631a | 103 | return stats->mean; |
506d4bc8 | 104 | } |
42202dd5 | 105 | |
506d4bc8 | 106 | /* |
63d40deb PZ |
107 | * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance |
108 | * | |
8a02631a PZ |
109 | * (\Sum n_i^2) - ((\Sum n_i)^2)/n |
110 | * s^2 = ------------------------------- | |
111 | * n - 1 | |
63d40deb PZ |
112 | * |
113 | * http://en.wikipedia.org/wiki/Stddev | |
114 | * | |
115 | * The std dev of the mean is related to the std dev by: | |
116 | * | |
117 | * s | |
118 | * s_mean = ------- | |
119 | * sqrt(n) | |
120 | * | |
506d4bc8 PZ |
121 | */ |
122 | static double stddev_stats(struct stats *stats) | |
123 | { | |
8a02631a PZ |
124 | double variance = stats->M2 / (stats->n - 1); |
125 | double variance_mean = variance / stats->n; | |
42202dd5 | 126 | |
63d40deb | 127 | return sqrt(variance_mean); |
506d4bc8 | 128 | } |
42202dd5 | 129 | |
506d4bc8 | 130 | struct stats event_res_stats[MAX_COUNTERS][3]; |
506d4bc8 PZ |
131 | struct stats runtime_nsecs_stats; |
132 | struct stats walltime_nsecs_stats; | |
133 | struct stats runtime_cycles_stats; | |
11018201 | 134 | struct stats runtime_branches_stats; |
be1ac0d8 | 135 | |
b9ebdcc0 JSR |
136 | #define MATCH_EVENT(t, c, counter) \ |
137 | (attrs[counter].type == PERF_TYPE_##t && \ | |
138 | attrs[counter].config == PERF_COUNT_##c) | |
139 | ||
cca03c0a | 140 | #define ERR_PERF_OPEN \ |
cdd6c482 | 141 | "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n" |
cca03c0a | 142 | |
051ae7f7 | 143 | static void create_perf_stat_counter(int counter, int pid) |
ddcacfa0 | 144 | { |
cdd6c482 | 145 | struct perf_event_attr *attr = attrs + counter; |
16c8a109 | 146 | |
ddcacfa0 | 147 | if (scale) |
a21ca2ca IM |
148 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
149 | PERF_FORMAT_TOTAL_TIME_RUNNING; | |
ddcacfa0 IM |
150 | |
151 | if (system_wide) { | |
f37a291c IM |
152 | unsigned int cpu; |
153 | ||
cca03c0a | 154 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
a12b51c4 | 155 | fd[cpu][counter] = sys_perf_event_open(attr, -1, cpumap[cpu], -1, 0); |
cca03c0a JSR |
156 | if (fd[cpu][counter] < 0 && verbose) |
157 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
158 | fd[cpu][counter], strerror(errno)); | |
ddcacfa0 IM |
159 | } |
160 | } else { | |
57e7986e PM |
161 | attr->inherit = inherit; |
162 | attr->disabled = 1; | |
163 | attr->enable_on_exec = 1; | |
ddcacfa0 | 164 | |
cdd6c482 | 165 | fd[0][counter] = sys_perf_event_open(attr, pid, -1, -1, 0); |
cca03c0a JSR |
166 | if (fd[0][counter] < 0 && verbose) |
167 | fprintf(stderr, ERR_PERF_OPEN, counter, | |
168 | fd[0][counter], strerror(errno)); | |
ddcacfa0 IM |
169 | } |
170 | } | |
171 | ||
c04f5e5d IM |
172 | /* |
173 | * Does the counter have nsecs as a unit? | |
174 | */ | |
175 | static inline int nsec_counter(int counter) | |
176 | { | |
b9ebdcc0 JSR |
177 | if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) || |
178 | MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) | |
c04f5e5d IM |
179 | return 1; |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | /* | |
2996f5dd | 185 | * Read out the results of a single counter: |
c04f5e5d | 186 | */ |
2996f5dd | 187 | static void read_counter(int counter) |
c04f5e5d | 188 | { |
849abde9 | 189 | u64 count[3], single_count[3]; |
f37a291c IM |
190 | unsigned int cpu; |
191 | size_t res, nv; | |
c04f5e5d | 192 | int scaled; |
9e9772c4 | 193 | int i; |
c04f5e5d IM |
194 | |
195 | count[0] = count[1] = count[2] = 0; | |
2996f5dd | 196 | |
c04f5e5d | 197 | nv = scale ? 3 : 1; |
cca03c0a | 198 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
743ee1f8 IM |
199 | if (fd[cpu][counter] < 0) |
200 | continue; | |
201 | ||
9cffa8d5 PM |
202 | res = read(fd[cpu][counter], single_count, nv * sizeof(u64)); |
203 | assert(res == nv * sizeof(u64)); | |
f37a291c | 204 | |
42202dd5 IM |
205 | close(fd[cpu][counter]); |
206 | fd[cpu][counter] = -1; | |
c04f5e5d IM |
207 | |
208 | count[0] += single_count[0]; | |
209 | if (scale) { | |
210 | count[1] += single_count[1]; | |
211 | count[2] += single_count[2]; | |
212 | } | |
213 | } | |
214 | ||
215 | scaled = 0; | |
216 | if (scale) { | |
217 | if (count[2] == 0) { | |
9e9772c4 | 218 | event_scaled[counter] = -1; |
2996f5dd | 219 | count[0] = 0; |
c04f5e5d IM |
220 | return; |
221 | } | |
2996f5dd | 222 | |
c04f5e5d | 223 | if (count[2] < count[1]) { |
9e9772c4 | 224 | event_scaled[counter] = 1; |
c04f5e5d IM |
225 | count[0] = (unsigned long long) |
226 | ((double)count[0] * count[1] / count[2] + 0.5); | |
227 | } | |
228 | } | |
9e9772c4 PZ |
229 | |
230 | for (i = 0; i < 3; i++) | |
231 | update_stats(&event_res_stats[counter][i], count[i]); | |
232 | ||
233 | if (verbose) { | |
234 | fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter), | |
235 | count[0], count[1], count[2]); | |
236 | } | |
237 | ||
be1ac0d8 IM |
238 | /* |
239 | * Save the full runtime - to allow normalization during printout: | |
240 | */ | |
b9ebdcc0 | 241 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) |
9e9772c4 | 242 | update_stats(&runtime_nsecs_stats, count[0]); |
b9ebdcc0 | 243 | if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) |
9e9772c4 | 244 | update_stats(&runtime_cycles_stats, count[0]); |
11018201 AB |
245 | if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter)) |
246 | update_stats(&runtime_branches_stats, count[0]); | |
2996f5dd IM |
247 | } |
248 | ||
f37a291c | 249 | static int run_perf_stat(int argc __used, const char **argv) |
42202dd5 IM |
250 | { |
251 | unsigned long long t0, t1; | |
252 | int status = 0; | |
253 | int counter; | |
60666c63 | 254 | int pid = target_pid; |
051ae7f7 | 255 | int child_ready_pipe[2], go_pipe[2]; |
60666c63 | 256 | const bool forks = (target_pid == -1 && argc > 0); |
051ae7f7 | 257 | char buf; |
42202dd5 IM |
258 | |
259 | if (!system_wide) | |
260 | nr_cpus = 1; | |
261 | ||
60666c63 | 262 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
051ae7f7 PM |
263 | perror("failed to create pipes"); |
264 | exit(1); | |
265 | } | |
266 | ||
60666c63 LW |
267 | if (forks) { |
268 | if ((pid = fork()) < 0) | |
269 | perror("failed to fork"); | |
270 | ||
271 | if (!pid) { | |
272 | close(child_ready_pipe[0]); | |
273 | close(go_pipe[1]); | |
274 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
275 | ||
276 | /* | |
277 | * Do a dummy execvp to get the PLT entry resolved, | |
278 | * so we avoid the resolver overhead on the real | |
279 | * execvp call. | |
280 | */ | |
281 | execvp("", (char **)argv); | |
282 | ||
283 | /* | |
284 | * Tell the parent we're ready to go | |
285 | */ | |
286 | close(child_ready_pipe[1]); | |
287 | ||
288 | /* | |
289 | * Wait until the parent tells us to go. | |
290 | */ | |
291 | if (read(go_pipe[0], &buf, 1) == -1) | |
292 | perror("unable to read pipe"); | |
293 | ||
294 | execvp(argv[0], (char **)argv); | |
295 | ||
296 | perror(argv[0]); | |
297 | exit(-1); | |
298 | } | |
051ae7f7 | 299 | |
60666c63 | 300 | child_pid = pid; |
051ae7f7 PM |
301 | |
302 | /* | |
60666c63 | 303 | * Wait for the child to be ready to exec. |
051ae7f7 PM |
304 | */ |
305 | close(child_ready_pipe[1]); | |
60666c63 LW |
306 | close(go_pipe[0]); |
307 | if (read(child_ready_pipe[0], &buf, 1) == -1) | |
a92bef0f | 308 | perror("unable to read pipe"); |
60666c63 | 309 | close(child_ready_pipe[0]); |
051ae7f7 PM |
310 | } |
311 | ||
42202dd5 | 312 | for (counter = 0; counter < nr_counters; counter++) |
051ae7f7 | 313 | create_perf_stat_counter(counter, pid); |
42202dd5 IM |
314 | |
315 | /* | |
316 | * Enable counters and exec the command: | |
317 | */ | |
318 | t0 = rdclock(); | |
42202dd5 | 319 | |
60666c63 LW |
320 | if (forks) { |
321 | close(go_pipe[1]); | |
322 | wait(&status); | |
323 | } else { | |
324 | while(!done); | |
325 | } | |
42202dd5 | 326 | |
42202dd5 IM |
327 | t1 = rdclock(); |
328 | ||
9e9772c4 | 329 | update_stats(&walltime_nsecs_stats, t1 - t0); |
42202dd5 IM |
330 | |
331 | for (counter = 0; counter < nr_counters; counter++) | |
332 | read_counter(counter); | |
333 | ||
334 | return WEXITSTATUS(status); | |
335 | } | |
336 | ||
849abde9 | 337 | static void print_noise(int counter, double avg) |
42202dd5 | 338 | { |
849abde9 PZ |
339 | if (run_count == 1) |
340 | return; | |
341 | ||
342 | fprintf(stderr, " ( +- %7.3f%% )", | |
343 | 100 * stddev_stats(&event_res_stats[counter][0]) / avg); | |
42202dd5 IM |
344 | } |
345 | ||
849abde9 | 346 | static void nsec_printout(int counter, double avg) |
44175b6f | 347 | { |
506d4bc8 | 348 | double msecs = avg / 1e6; |
44175b6f | 349 | |
6e750a8f | 350 | fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter)); |
44175b6f | 351 | |
b9ebdcc0 | 352 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) { |
506d4bc8 PZ |
353 | fprintf(stderr, " # %10.3f CPUs ", |
354 | avg / avg_stats(&walltime_nsecs_stats)); | |
44175b6f IM |
355 | } |
356 | } | |
357 | ||
849abde9 | 358 | static void abs_printout(int counter, double avg) |
44175b6f | 359 | { |
c7f7fea3 IM |
360 | double total, ratio = 0.0; |
361 | ||
506d4bc8 | 362 | fprintf(stderr, " %14.0f %-24s", avg, event_name(counter)); |
44175b6f | 363 | |
506d4bc8 | 364 | if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) { |
c7f7fea3 IM |
365 | total = avg_stats(&runtime_cycles_stats); |
366 | ||
367 | if (total) | |
368 | ratio = avg / total; | |
369 | ||
370 | fprintf(stderr, " # %10.3f IPC ", ratio); | |
7255fe2a LDM |
371 | } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) && |
372 | runtime_branches_stats.n != 0) { | |
11018201 AB |
373 | total = avg_stats(&runtime_branches_stats); |
374 | ||
375 | if (total) | |
376 | ratio = avg * 100 / total; | |
377 | ||
dd86e72a | 378 | fprintf(stderr, " # %10.3f %% ", ratio); |
11018201 | 379 | |
7255fe2a | 380 | } else if (runtime_nsecs_stats.n != 0) { |
c7f7fea3 IM |
381 | total = avg_stats(&runtime_nsecs_stats); |
382 | ||
383 | if (total) | |
384 | ratio = 1000.0 * avg / total; | |
385 | ||
386 | fprintf(stderr, " # %10.3f M/sec", ratio); | |
44175b6f | 387 | } |
44175b6f IM |
388 | } |
389 | ||
2996f5dd IM |
390 | /* |
391 | * Print out the results of a single counter: | |
392 | */ | |
393 | static void print_counter(int counter) | |
394 | { | |
849abde9 | 395 | double avg = avg_stats(&event_res_stats[counter][0]); |
63d40deb | 396 | int scaled = event_scaled[counter]; |
2996f5dd | 397 | |
2996f5dd | 398 | if (scaled == -1) { |
6e750a8f | 399 | fprintf(stderr, " %14s %-24s\n", |
2996f5dd IM |
400 | "<not counted>", event_name(counter)); |
401 | return; | |
402 | } | |
c04f5e5d | 403 | |
44175b6f | 404 | if (nsec_counter(counter)) |
849abde9 | 405 | nsec_printout(counter, avg); |
44175b6f | 406 | else |
849abde9 PZ |
407 | abs_printout(counter, avg); |
408 | ||
409 | print_noise(counter, avg); | |
506d4bc8 PZ |
410 | |
411 | if (scaled) { | |
412 | double avg_enabled, avg_running; | |
413 | ||
414 | avg_enabled = avg_stats(&event_res_stats[counter][1]); | |
415 | avg_running = avg_stats(&event_res_stats[counter][2]); | |
d7c29318 | 416 | |
210ad39f | 417 | fprintf(stderr, " (scaled from %.2f%%)", |
506d4bc8 PZ |
418 | 100 * avg_running / avg_enabled); |
419 | } | |
44175b6f | 420 | |
c04f5e5d IM |
421 | fprintf(stderr, "\n"); |
422 | } | |
423 | ||
42202dd5 IM |
424 | static void print_stat(int argc, const char **argv) |
425 | { | |
426 | int i, counter; | |
427 | ||
ddcacfa0 IM |
428 | fflush(stdout); |
429 | ||
430 | fprintf(stderr, "\n"); | |
60666c63 LW |
431 | fprintf(stderr, " Performance counter stats for "); |
432 | if(target_pid == -1) { | |
433 | fprintf(stderr, "\'%s", argv[0]); | |
434 | for (i = 1; i < argc; i++) | |
435 | fprintf(stderr, " %s", argv[i]); | |
436 | }else | |
437 | fprintf(stderr, "task pid \'%d", target_pid); | |
44db76c8 | 438 | |
42202dd5 IM |
439 | fprintf(stderr, "\'"); |
440 | if (run_count > 1) | |
441 | fprintf(stderr, " (%d runs)", run_count); | |
442 | fprintf(stderr, ":\n\n"); | |
2996f5dd | 443 | |
c04f5e5d IM |
444 | for (counter = 0; counter < nr_counters; counter++) |
445 | print_counter(counter); | |
ddcacfa0 | 446 | |
ddcacfa0 | 447 | fprintf(stderr, "\n"); |
566747e6 | 448 | fprintf(stderr, " %14.9f seconds time elapsed", |
506d4bc8 | 449 | avg_stats(&walltime_nsecs_stats)/1e9); |
566747e6 IM |
450 | if (run_count > 1) { |
451 | fprintf(stderr, " ( +- %7.3f%% )", | |
506d4bc8 PZ |
452 | 100*stddev_stats(&walltime_nsecs_stats) / |
453 | avg_stats(&walltime_nsecs_stats)); | |
566747e6 IM |
454 | } |
455 | fprintf(stderr, "\n\n"); | |
ddcacfa0 IM |
456 | } |
457 | ||
f7b7c26e PZ |
458 | static volatile int signr = -1; |
459 | ||
5242519b | 460 | static void skip_signal(int signo) |
ddcacfa0 | 461 | { |
60666c63 LW |
462 | if(target_pid != -1) |
463 | done = 1; | |
464 | ||
f7b7c26e PZ |
465 | signr = signo; |
466 | } | |
467 | ||
468 | static void sig_atexit(void) | |
469 | { | |
933da83a CW |
470 | if (child_pid != -1) |
471 | kill(child_pid, SIGTERM); | |
472 | ||
f7b7c26e PZ |
473 | if (signr == -1) |
474 | return; | |
475 | ||
476 | signal(signr, SIG_DFL); | |
477 | kill(getpid(), signr); | |
5242519b IM |
478 | } |
479 | ||
480 | static const char * const stat_usage[] = { | |
60666c63 | 481 | "perf stat [<options>] [<command>]", |
5242519b IM |
482 | NULL |
483 | }; | |
484 | ||
5242519b IM |
485 | static const struct option options[] = { |
486 | OPT_CALLBACK('e', "event", NULL, "event", | |
86847b62 TG |
487 | "event selector. use 'perf list' to list available events", |
488 | parse_events), | |
5242519b IM |
489 | OPT_BOOLEAN('i', "inherit", &inherit, |
490 | "child tasks inherit counters"), | |
491 | OPT_INTEGER('p', "pid", &target_pid, | |
492 | "stat events on existing pid"), | |
493 | OPT_BOOLEAN('a', "all-cpus", &system_wide, | |
3d632595 | 494 | "system-wide collection from all CPUs"), |
b26bc5a7 | 495 | OPT_BOOLEAN('c', "scale", &scale, |
3d632595 | 496 | "scale/normalize counters"), |
743ee1f8 IM |
497 | OPT_BOOLEAN('v', "verbose", &verbose, |
498 | "be more verbose (show counter open errors, etc)"), | |
42202dd5 IM |
499 | OPT_INTEGER('r', "repeat", &run_count, |
500 | "repeat command and print average + stddev (max: 100)"), | |
0cfb7a13 IM |
501 | OPT_BOOLEAN('n', "null", &null_run, |
502 | "null run - dont start any counters"), | |
5242519b IM |
503 | OPT_END() |
504 | }; | |
505 | ||
f37a291c | 506 | int cmd_stat(int argc, const char **argv, const char *prefix __used) |
5242519b | 507 | { |
42202dd5 IM |
508 | int status; |
509 | ||
a0541234 AB |
510 | argc = parse_options(argc, argv, options, stat_usage, |
511 | PARSE_OPT_STOP_AT_NON_OPTION); | |
60666c63 | 512 | if (!argc && target_pid == -1) |
5242519b | 513 | usage_with_options(stat_usage, options); |
9e9772c4 | 514 | if (run_count <= 0) |
42202dd5 | 515 | usage_with_options(stat_usage, options); |
ddcacfa0 | 516 | |
c3043569 JSR |
517 | /* Set attrs and nr_counters if no event is selected and !null_run */ |
518 | if (!null_run && !nr_counters) { | |
519 | memcpy(attrs, default_attrs, sizeof(default_attrs)); | |
520 | nr_counters = ARRAY_SIZE(default_attrs); | |
521 | } | |
ddcacfa0 | 522 | |
a12b51c4 PM |
523 | if (system_wide) |
524 | nr_cpus = read_cpu_map(); | |
525 | else | |
526 | nr_cpus = 1; | |
ddcacfa0 | 527 | |
58d7e993 IM |
528 | /* |
529 | * We dont want to block the signals - that would cause | |
530 | * child tasks to inherit that and Ctrl-C would not work. | |
531 | * What we want is for Ctrl-C to work in the exec()-ed | |
532 | * task, but being ignored by perf stat itself: | |
533 | */ | |
f7b7c26e | 534 | atexit(sig_atexit); |
58d7e993 IM |
535 | signal(SIGINT, skip_signal); |
536 | signal(SIGALRM, skip_signal); | |
537 | signal(SIGABRT, skip_signal); | |
538 | ||
42202dd5 IM |
539 | status = 0; |
540 | for (run_idx = 0; run_idx < run_count; run_idx++) { | |
541 | if (run_count != 1 && verbose) | |
3d632595 | 542 | fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1); |
42202dd5 IM |
543 | status = run_perf_stat(argc, argv); |
544 | } | |
545 | ||
546 | print_stat(argc, argv); | |
547 | ||
548 | return status; | |
ddcacfa0 | 549 | } |