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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" |
a12b51c4 | 48 | #include "util/cpumap.h" |
d6d901c2 | 49 | #include "util/thread.h" |
ddcacfa0 | 50 | |
ddcacfa0 | 51 | #include <sys/prctl.h> |
42202dd5 | 52 | #include <math.h> |
16c8a109 | 53 | |
cdd6c482 | 54 | static struct perf_event_attr default_attrs[] = { |
ddcacfa0 | 55 | |
56aab464 IM |
56 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK }, |
57 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES }, | |
58 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS }, | |
59 | { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS }, | |
f4dbfa8f | 60 | |
56aab464 IM |
61 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES }, |
62 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS }, | |
56aab464 IM |
63 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, |
64 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES }, | |
dd86e72a IM |
65 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES }, |
66 | { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES }, | |
f4dbfa8f | 67 | |
ddcacfa0 | 68 | }; |
5242519b | 69 | |
c0555642 | 70 | static bool system_wide = false; |
f37a291c | 71 | static unsigned int nr_cpus = 0; |
3d632595 | 72 | static int run_idx = 0; |
ddcacfa0 | 73 | |
3d632595 | 74 | static int run_count = 1; |
2e6cdf99 | 75 | static bool no_inherit = false; |
c0555642 | 76 | static bool scale = true; |
933da83a | 77 | static pid_t target_pid = -1; |
d6d901c2 ZY |
78 | static pid_t target_tid = -1; |
79 | static pid_t *all_tids = NULL; | |
80 | static int thread_num = 0; | |
933da83a | 81 | static pid_t child_pid = -1; |
c0555642 | 82 | static bool null_run = false; |
ddcacfa0 | 83 | |
d6d901c2 | 84 | static int *fd[MAX_NR_CPUS][MAX_COUNTERS]; |
42202dd5 | 85 | |
63d40deb | 86 | static int event_scaled[MAX_COUNTERS]; |
3d632595 | 87 | |
60666c63 LW |
88 | static volatile int done = 0; |
89 | ||
506d4bc8 PZ |
90 | struct stats |
91 | { | |
8a02631a | 92 | double n, mean, M2; |
506d4bc8 | 93 | }; |
42202dd5 | 94 | |
9e9772c4 PZ |
95 | static void update_stats(struct stats *stats, u64 val) |
96 | { | |
8a02631a | 97 | double delta; |
9e9772c4 | 98 | |
8a02631a PZ |
99 | stats->n++; |
100 | delta = val - stats->mean; | |
101 | stats->mean += delta / stats->n; | |
102 | stats->M2 += delta*(val - stats->mean); | |
9e9772c4 PZ |
103 | } |
104 | ||
506d4bc8 PZ |
105 | static double avg_stats(struct stats *stats) |
106 | { | |
8a02631a | 107 | return stats->mean; |
506d4bc8 | 108 | } |
42202dd5 | 109 | |
506d4bc8 | 110 | /* |
63d40deb PZ |
111 | * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance |
112 | * | |
8a02631a PZ |
113 | * (\Sum n_i^2) - ((\Sum n_i)^2)/n |
114 | * s^2 = ------------------------------- | |
115 | * n - 1 | |
63d40deb PZ |
116 | * |
117 | * http://en.wikipedia.org/wiki/Stddev | |
118 | * | |
119 | * The std dev of the mean is related to the std dev by: | |
120 | * | |
121 | * s | |
122 | * s_mean = ------- | |
123 | * sqrt(n) | |
124 | * | |
506d4bc8 PZ |
125 | */ |
126 | static double stddev_stats(struct stats *stats) | |
127 | { | |
8a02631a PZ |
128 | double variance = stats->M2 / (stats->n - 1); |
129 | double variance_mean = variance / stats->n; | |
42202dd5 | 130 | |
63d40deb | 131 | return sqrt(variance_mean); |
506d4bc8 | 132 | } |
42202dd5 | 133 | |
506d4bc8 | 134 | struct stats event_res_stats[MAX_COUNTERS][3]; |
506d4bc8 PZ |
135 | struct stats runtime_nsecs_stats; |
136 | struct stats walltime_nsecs_stats; | |
137 | struct stats runtime_cycles_stats; | |
11018201 | 138 | struct stats runtime_branches_stats; |
be1ac0d8 | 139 | |
b9ebdcc0 JSR |
140 | #define MATCH_EVENT(t, c, counter) \ |
141 | (attrs[counter].type == PERF_TYPE_##t && \ | |
142 | attrs[counter].config == PERF_COUNT_##c) | |
143 | ||
cca03c0a | 144 | #define ERR_PERF_OPEN \ |
cdd6c482 | 145 | "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n" |
cca03c0a | 146 | |
084ab9f8 | 147 | static int create_perf_stat_counter(int counter) |
ddcacfa0 | 148 | { |
cdd6c482 | 149 | struct perf_event_attr *attr = attrs + counter; |
d6d901c2 | 150 | int thread; |
084ab9f8 | 151 | int ncreated = 0; |
16c8a109 | 152 | |
ddcacfa0 | 153 | if (scale) |
a21ca2ca IM |
154 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
155 | PERF_FORMAT_TOTAL_TIME_RUNNING; | |
ddcacfa0 IM |
156 | |
157 | if (system_wide) { | |
f37a291c IM |
158 | unsigned int cpu; |
159 | ||
cca03c0a | 160 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
d6d901c2 ZY |
161 | fd[cpu][counter][0] = sys_perf_event_open(attr, |
162 | -1, cpumap[cpu], -1, 0); | |
084ab9f8 ACM |
163 | if (fd[cpu][counter][0] < 0) |
164 | pr_debug(ERR_PERF_OPEN, counter, | |
165 | fd[cpu][counter][0], strerror(errno)); | |
166 | else | |
167 | ++ncreated; | |
ddcacfa0 IM |
168 | } |
169 | } else { | |
2e6cdf99 SE |
170 | attr->inherit = !no_inherit; |
171 | if (target_pid == -1 && target_tid == -1) { | |
6be2850e ZY |
172 | attr->disabled = 1; |
173 | attr->enable_on_exec = 1; | |
174 | } | |
d6d901c2 ZY |
175 | for (thread = 0; thread < thread_num; thread++) { |
176 | fd[0][counter][thread] = sys_perf_event_open(attr, | |
177 | all_tids[thread], -1, -1, 0); | |
084ab9f8 ACM |
178 | if (fd[0][counter][thread] < 0) |
179 | pr_debug(ERR_PERF_OPEN, counter, | |
180 | fd[0][counter][thread], | |
181 | strerror(errno)); | |
182 | else | |
183 | ++ncreated; | |
d6d901c2 | 184 | } |
ddcacfa0 | 185 | } |
084ab9f8 ACM |
186 | |
187 | return ncreated; | |
ddcacfa0 IM |
188 | } |
189 | ||
c04f5e5d IM |
190 | /* |
191 | * Does the counter have nsecs as a unit? | |
192 | */ | |
193 | static inline int nsec_counter(int counter) | |
194 | { | |
b9ebdcc0 JSR |
195 | if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) || |
196 | MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) | |
c04f5e5d IM |
197 | return 1; |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* | |
2996f5dd | 203 | * Read out the results of a single counter: |
c04f5e5d | 204 | */ |
2996f5dd | 205 | static void read_counter(int counter) |
c04f5e5d | 206 | { |
849abde9 | 207 | u64 count[3], single_count[3]; |
f37a291c IM |
208 | unsigned int cpu; |
209 | size_t res, nv; | |
c04f5e5d | 210 | int scaled; |
d6d901c2 | 211 | int i, thread; |
c04f5e5d IM |
212 | |
213 | count[0] = count[1] = count[2] = 0; | |
2996f5dd | 214 | |
c04f5e5d | 215 | nv = scale ? 3 : 1; |
cca03c0a | 216 | for (cpu = 0; cpu < nr_cpus; cpu++) { |
d6d901c2 ZY |
217 | for (thread = 0; thread < thread_num; thread++) { |
218 | if (fd[cpu][counter][thread] < 0) | |
219 | continue; | |
220 | ||
221 | res = read(fd[cpu][counter][thread], | |
222 | single_count, nv * sizeof(u64)); | |
223 | assert(res == nv * sizeof(u64)); | |
224 | ||
225 | close(fd[cpu][counter][thread]); | |
226 | fd[cpu][counter][thread] = -1; | |
227 | ||
228 | count[0] += single_count[0]; | |
229 | if (scale) { | |
230 | count[1] += single_count[1]; | |
231 | count[2] += single_count[2]; | |
232 | } | |
c04f5e5d IM |
233 | } |
234 | } | |
235 | ||
236 | scaled = 0; | |
237 | if (scale) { | |
238 | if (count[2] == 0) { | |
9e9772c4 | 239 | event_scaled[counter] = -1; |
2996f5dd | 240 | count[0] = 0; |
c04f5e5d IM |
241 | return; |
242 | } | |
2996f5dd | 243 | |
c04f5e5d | 244 | if (count[2] < count[1]) { |
9e9772c4 | 245 | event_scaled[counter] = 1; |
c04f5e5d IM |
246 | count[0] = (unsigned long long) |
247 | ((double)count[0] * count[1] / count[2] + 0.5); | |
248 | } | |
249 | } | |
9e9772c4 PZ |
250 | |
251 | for (i = 0; i < 3; i++) | |
252 | update_stats(&event_res_stats[counter][i], count[i]); | |
253 | ||
254 | if (verbose) { | |
255 | fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter), | |
256 | count[0], count[1], count[2]); | |
257 | } | |
258 | ||
be1ac0d8 IM |
259 | /* |
260 | * Save the full runtime - to allow normalization during printout: | |
261 | */ | |
b9ebdcc0 | 262 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) |
9e9772c4 | 263 | update_stats(&runtime_nsecs_stats, count[0]); |
b9ebdcc0 | 264 | if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter)) |
9e9772c4 | 265 | update_stats(&runtime_cycles_stats, count[0]); |
11018201 AB |
266 | if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter)) |
267 | update_stats(&runtime_branches_stats, count[0]); | |
2996f5dd IM |
268 | } |
269 | ||
f37a291c | 270 | static int run_perf_stat(int argc __used, const char **argv) |
42202dd5 IM |
271 | { |
272 | unsigned long long t0, t1; | |
273 | int status = 0; | |
084ab9f8 | 274 | int counter, ncreated = 0; |
051ae7f7 | 275 | int child_ready_pipe[2], go_pipe[2]; |
6be2850e | 276 | const bool forks = (argc > 0); |
051ae7f7 | 277 | char buf; |
42202dd5 IM |
278 | |
279 | if (!system_wide) | |
280 | nr_cpus = 1; | |
281 | ||
60666c63 | 282 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
051ae7f7 PM |
283 | perror("failed to create pipes"); |
284 | exit(1); | |
285 | } | |
286 | ||
60666c63 | 287 | if (forks) { |
6be2850e | 288 | if ((child_pid = fork()) < 0) |
60666c63 LW |
289 | perror("failed to fork"); |
290 | ||
6be2850e | 291 | if (!child_pid) { |
60666c63 LW |
292 | close(child_ready_pipe[0]); |
293 | close(go_pipe[1]); | |
294 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); | |
295 | ||
296 | /* | |
297 | * Do a dummy execvp to get the PLT entry resolved, | |
298 | * so we avoid the resolver overhead on the real | |
299 | * execvp call. | |
300 | */ | |
301 | execvp("", (char **)argv); | |
302 | ||
303 | /* | |
304 | * Tell the parent we're ready to go | |
305 | */ | |
306 | close(child_ready_pipe[1]); | |
307 | ||
308 | /* | |
309 | * Wait until the parent tells us to go. | |
310 | */ | |
311 | if (read(go_pipe[0], &buf, 1) == -1) | |
312 | perror("unable to read pipe"); | |
313 | ||
314 | execvp(argv[0], (char **)argv); | |
315 | ||
316 | perror(argv[0]); | |
317 | exit(-1); | |
318 | } | |
051ae7f7 | 319 | |
d6d901c2 ZY |
320 | if (target_tid == -1 && target_pid == -1 && !system_wide) |
321 | all_tids[0] = child_pid; | |
322 | ||
051ae7f7 | 323 | /* |
60666c63 | 324 | * Wait for the child to be ready to exec. |
051ae7f7 PM |
325 | */ |
326 | close(child_ready_pipe[1]); | |
60666c63 LW |
327 | close(go_pipe[0]); |
328 | if (read(child_ready_pipe[0], &buf, 1) == -1) | |
a92bef0f | 329 | perror("unable to read pipe"); |
60666c63 | 330 | close(child_ready_pipe[0]); |
051ae7f7 PM |
331 | } |
332 | ||
42202dd5 | 333 | for (counter = 0; counter < nr_counters; counter++) |
084ab9f8 ACM |
334 | ncreated += create_perf_stat_counter(counter); |
335 | ||
336 | if (ncreated == 0) { | |
337 | pr_err("No permission to collect %sstats.\n" | |
338 | "Consider tweaking /proc/sys/kernel/perf_event_paranoid.\n", | |
339 | system_wide ? "system-wide " : ""); | |
340 | if (child_pid != -1) | |
341 | kill(child_pid, SIGTERM); | |
342 | return -1; | |
343 | } | |
42202dd5 IM |
344 | |
345 | /* | |
346 | * Enable counters and exec the command: | |
347 | */ | |
348 | t0 = rdclock(); | |
42202dd5 | 349 | |
60666c63 LW |
350 | if (forks) { |
351 | close(go_pipe[1]); | |
352 | wait(&status); | |
353 | } else { | |
6be2850e | 354 | while(!done) sleep(1); |
60666c63 | 355 | } |
42202dd5 | 356 | |
42202dd5 IM |
357 | t1 = rdclock(); |
358 | ||
9e9772c4 | 359 | update_stats(&walltime_nsecs_stats, t1 - t0); |
42202dd5 IM |
360 | |
361 | for (counter = 0; counter < nr_counters; counter++) | |
362 | read_counter(counter); | |
363 | ||
364 | return WEXITSTATUS(status); | |
365 | } | |
366 | ||
849abde9 | 367 | static void print_noise(int counter, double avg) |
42202dd5 | 368 | { |
849abde9 PZ |
369 | if (run_count == 1) |
370 | return; | |
371 | ||
372 | fprintf(stderr, " ( +- %7.3f%% )", | |
373 | 100 * stddev_stats(&event_res_stats[counter][0]) / avg); | |
42202dd5 IM |
374 | } |
375 | ||
849abde9 | 376 | static void nsec_printout(int counter, double avg) |
44175b6f | 377 | { |
506d4bc8 | 378 | double msecs = avg / 1e6; |
44175b6f | 379 | |
6e750a8f | 380 | fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter)); |
44175b6f | 381 | |
b9ebdcc0 | 382 | if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) { |
506d4bc8 PZ |
383 | fprintf(stderr, " # %10.3f CPUs ", |
384 | avg / avg_stats(&walltime_nsecs_stats)); | |
44175b6f IM |
385 | } |
386 | } | |
387 | ||
849abde9 | 388 | static void abs_printout(int counter, double avg) |
44175b6f | 389 | { |
c7f7fea3 IM |
390 | double total, ratio = 0.0; |
391 | ||
506d4bc8 | 392 | fprintf(stderr, " %14.0f %-24s", avg, event_name(counter)); |
44175b6f | 393 | |
506d4bc8 | 394 | if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) { |
c7f7fea3 IM |
395 | total = avg_stats(&runtime_cycles_stats); |
396 | ||
397 | if (total) | |
398 | ratio = avg / total; | |
399 | ||
400 | fprintf(stderr, " # %10.3f IPC ", ratio); | |
7255fe2a LDM |
401 | } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) && |
402 | runtime_branches_stats.n != 0) { | |
11018201 AB |
403 | total = avg_stats(&runtime_branches_stats); |
404 | ||
405 | if (total) | |
406 | ratio = avg * 100 / total; | |
407 | ||
dd86e72a | 408 | fprintf(stderr, " # %10.3f %% ", ratio); |
11018201 | 409 | |
7255fe2a | 410 | } else if (runtime_nsecs_stats.n != 0) { |
c7f7fea3 IM |
411 | total = avg_stats(&runtime_nsecs_stats); |
412 | ||
413 | if (total) | |
414 | ratio = 1000.0 * avg / total; | |
415 | ||
416 | fprintf(stderr, " # %10.3f M/sec", ratio); | |
44175b6f | 417 | } |
44175b6f IM |
418 | } |
419 | ||
2996f5dd IM |
420 | /* |
421 | * Print out the results of a single counter: | |
422 | */ | |
423 | static void print_counter(int counter) | |
424 | { | |
849abde9 | 425 | double avg = avg_stats(&event_res_stats[counter][0]); |
63d40deb | 426 | int scaled = event_scaled[counter]; |
2996f5dd | 427 | |
2996f5dd | 428 | if (scaled == -1) { |
6e750a8f | 429 | fprintf(stderr, " %14s %-24s\n", |
2996f5dd IM |
430 | "<not counted>", event_name(counter)); |
431 | return; | |
432 | } | |
c04f5e5d | 433 | |
44175b6f | 434 | if (nsec_counter(counter)) |
849abde9 | 435 | nsec_printout(counter, avg); |
44175b6f | 436 | else |
849abde9 PZ |
437 | abs_printout(counter, avg); |
438 | ||
439 | print_noise(counter, avg); | |
506d4bc8 PZ |
440 | |
441 | if (scaled) { | |
442 | double avg_enabled, avg_running; | |
443 | ||
444 | avg_enabled = avg_stats(&event_res_stats[counter][1]); | |
445 | avg_running = avg_stats(&event_res_stats[counter][2]); | |
d7c29318 | 446 | |
210ad39f | 447 | fprintf(stderr, " (scaled from %.2f%%)", |
506d4bc8 PZ |
448 | 100 * avg_running / avg_enabled); |
449 | } | |
44175b6f | 450 | |
c04f5e5d IM |
451 | fprintf(stderr, "\n"); |
452 | } | |
453 | ||
42202dd5 IM |
454 | static void print_stat(int argc, const char **argv) |
455 | { | |
456 | int i, counter; | |
457 | ||
ddcacfa0 IM |
458 | fflush(stdout); |
459 | ||
460 | fprintf(stderr, "\n"); | |
60666c63 | 461 | fprintf(stderr, " Performance counter stats for "); |
d6d901c2 | 462 | if(target_pid == -1 && target_tid == -1) { |
60666c63 LW |
463 | fprintf(stderr, "\'%s", argv[0]); |
464 | for (i = 1; i < argc; i++) | |
465 | fprintf(stderr, " %s", argv[i]); | |
d6d901c2 ZY |
466 | } else if (target_pid != -1) |
467 | fprintf(stderr, "process id \'%d", target_pid); | |
468 | else | |
469 | fprintf(stderr, "thread id \'%d", target_tid); | |
44db76c8 | 470 | |
42202dd5 IM |
471 | fprintf(stderr, "\'"); |
472 | if (run_count > 1) | |
473 | fprintf(stderr, " (%d runs)", run_count); | |
474 | fprintf(stderr, ":\n\n"); | |
2996f5dd | 475 | |
c04f5e5d IM |
476 | for (counter = 0; counter < nr_counters; counter++) |
477 | print_counter(counter); | |
ddcacfa0 | 478 | |
ddcacfa0 | 479 | fprintf(stderr, "\n"); |
566747e6 | 480 | fprintf(stderr, " %14.9f seconds time elapsed", |
506d4bc8 | 481 | avg_stats(&walltime_nsecs_stats)/1e9); |
566747e6 IM |
482 | if (run_count > 1) { |
483 | fprintf(stderr, " ( +- %7.3f%% )", | |
506d4bc8 PZ |
484 | 100*stddev_stats(&walltime_nsecs_stats) / |
485 | avg_stats(&walltime_nsecs_stats)); | |
566747e6 IM |
486 | } |
487 | fprintf(stderr, "\n\n"); | |
ddcacfa0 IM |
488 | } |
489 | ||
f7b7c26e PZ |
490 | static volatile int signr = -1; |
491 | ||
5242519b | 492 | static void skip_signal(int signo) |
ddcacfa0 | 493 | { |
6be2850e | 494 | if(child_pid == -1) |
60666c63 LW |
495 | done = 1; |
496 | ||
f7b7c26e PZ |
497 | signr = signo; |
498 | } | |
499 | ||
500 | static void sig_atexit(void) | |
501 | { | |
933da83a CW |
502 | if (child_pid != -1) |
503 | kill(child_pid, SIGTERM); | |
504 | ||
f7b7c26e PZ |
505 | if (signr == -1) |
506 | return; | |
507 | ||
508 | signal(signr, SIG_DFL); | |
509 | kill(getpid(), signr); | |
5242519b IM |
510 | } |
511 | ||
512 | static const char * const stat_usage[] = { | |
60666c63 | 513 | "perf stat [<options>] [<command>]", |
5242519b IM |
514 | NULL |
515 | }; | |
516 | ||
5242519b IM |
517 | static const struct option options[] = { |
518 | OPT_CALLBACK('e', "event", NULL, "event", | |
86847b62 TG |
519 | "event selector. use 'perf list' to list available events", |
520 | parse_events), | |
2e6cdf99 SE |
521 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
522 | "child tasks do not inherit counters"), | |
5242519b | 523 | OPT_INTEGER('p', "pid", &target_pid, |
d6d901c2 ZY |
524 | "stat events on existing process id"), |
525 | OPT_INTEGER('t', "tid", &target_tid, | |
526 | "stat events on existing thread id"), | |
5242519b | 527 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
3d632595 | 528 | "system-wide collection from all CPUs"), |
b26bc5a7 | 529 | OPT_BOOLEAN('c', "scale", &scale, |
3d632595 | 530 | "scale/normalize counters"), |
c0555642 | 531 | OPT_INCR('v', "verbose", &verbose, |
743ee1f8 | 532 | "be more verbose (show counter open errors, etc)"), |
42202dd5 IM |
533 | OPT_INTEGER('r', "repeat", &run_count, |
534 | "repeat command and print average + stddev (max: 100)"), | |
0cfb7a13 IM |
535 | OPT_BOOLEAN('n', "null", &null_run, |
536 | "null run - dont start any counters"), | |
5242519b IM |
537 | OPT_END() |
538 | }; | |
539 | ||
f37a291c | 540 | int cmd_stat(int argc, const char **argv, const char *prefix __used) |
5242519b | 541 | { |
42202dd5 | 542 | int status; |
d6d901c2 | 543 | int i,j; |
42202dd5 | 544 | |
a0541234 AB |
545 | argc = parse_options(argc, argv, options, stat_usage, |
546 | PARSE_OPT_STOP_AT_NON_OPTION); | |
d6d901c2 | 547 | if (!argc && target_pid == -1 && target_tid == -1) |
5242519b | 548 | usage_with_options(stat_usage, options); |
9e9772c4 | 549 | if (run_count <= 0) |
42202dd5 | 550 | usage_with_options(stat_usage, options); |
ddcacfa0 | 551 | |
c3043569 JSR |
552 | /* Set attrs and nr_counters if no event is selected and !null_run */ |
553 | if (!null_run && !nr_counters) { | |
554 | memcpy(attrs, default_attrs, sizeof(default_attrs)); | |
555 | nr_counters = ARRAY_SIZE(default_attrs); | |
556 | } | |
ddcacfa0 | 557 | |
a12b51c4 PM |
558 | if (system_wide) |
559 | nr_cpus = read_cpu_map(); | |
560 | else | |
561 | nr_cpus = 1; | |
ddcacfa0 | 562 | |
d6d901c2 ZY |
563 | if (target_pid != -1) { |
564 | target_tid = target_pid; | |
565 | thread_num = find_all_tid(target_pid, &all_tids); | |
566 | if (thread_num <= 0) { | |
567 | fprintf(stderr, "Can't find all threads of pid %d\n", | |
568 | target_pid); | |
569 | usage_with_options(stat_usage, options); | |
570 | } | |
571 | } else { | |
572 | all_tids=malloc(sizeof(pid_t)); | |
573 | if (!all_tids) | |
574 | return -ENOMEM; | |
575 | ||
576 | all_tids[0] = target_tid; | |
577 | thread_num = 1; | |
578 | } | |
579 | ||
580 | for (i = 0; i < MAX_NR_CPUS; i++) { | |
581 | for (j = 0; j < MAX_COUNTERS; j++) { | |
582 | fd[i][j] = malloc(sizeof(int)*thread_num); | |
583 | if (!fd[i][j]) | |
584 | return -ENOMEM; | |
585 | } | |
586 | } | |
587 | ||
58d7e993 IM |
588 | /* |
589 | * We dont want to block the signals - that would cause | |
590 | * child tasks to inherit that and Ctrl-C would not work. | |
591 | * What we want is for Ctrl-C to work in the exec()-ed | |
592 | * task, but being ignored by perf stat itself: | |
593 | */ | |
f7b7c26e | 594 | atexit(sig_atexit); |
58d7e993 IM |
595 | signal(SIGINT, skip_signal); |
596 | signal(SIGALRM, skip_signal); | |
597 | signal(SIGABRT, skip_signal); | |
598 | ||
42202dd5 IM |
599 | status = 0; |
600 | for (run_idx = 0; run_idx < run_count; run_idx++) { | |
601 | if (run_count != 1 && verbose) | |
3d632595 | 602 | fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1); |
42202dd5 IM |
603 | status = run_perf_stat(argc, argv); |
604 | } | |
605 | ||
084ab9f8 ACM |
606 | if (status != -1) |
607 | print_stat(argc, argv); | |
42202dd5 IM |
608 | |
609 | return status; | |
ddcacfa0 | 610 | } |