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firewire: sbp2: fix stall with "Unsolicited response"
[firewire-audio.git] / tools / perf / builtin-stat.c
blob9a39ca3c3ac4fe77f5ed23c82b8dc8cc973b9f51
1 /*
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:
8
9 $ perf stat ~/hackbench 10
10 Time: 0.104
11
12 Performance counter stats for '/home/mingo/hackbench':
13
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
22
23 Wall-clock time elapsed: 123.786620 msecs
24
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>
35 * Jaswinder Singh Rajput <jaswinder@kernel.org>
36 *
37 * Released under the GPL v2. (and only v2, not any later version)
38 */
39
40 #include "perf.h"
41 #include "builtin.h"
42 #include "util/util.h"
43 #include "util/parse-options.h"
44 #include "util/parse-events.h"
45 #include "util/event.h"
46 #include "util/debug.h"
47 #include "util/header.h"
48 #include "util/cpumap.h"
49 #include "util/thread.h"
50
51 #include <sys/prctl.h>
52 #include <math.h>
53 #include <locale.h>
54
55 static struct perf_event_attr default_attrs[] = {
56
57 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
58 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },
59 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
60 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
61
62 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
63 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
64 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
65 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },
66 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES },
67 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
68
69 };
70
71 static bool system_wide = false;
72 static unsigned int nr_cpus = 0;
73 static int run_idx = 0;
74
75 static int run_count = 1;
76 static bool no_inherit = false;
77 static bool scale = true;
78 static pid_t target_pid = -1;
79 static pid_t target_tid = -1;
80 static pid_t *all_tids = NULL;
81 static int thread_num = 0;
82 static pid_t child_pid = -1;
83 static bool null_run = false;
84 static bool big_num = false;
85
86
87 static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
88
89 static int event_scaled[MAX_COUNTERS];
90
91 static volatile int done = 0;
92
93 struct stats
94 {
95 double n, mean, M2;
96 };
97
98 static void update_stats(struct stats *stats, u64 val)
99 {
100 double delta;
101
102 stats->n++;
103 delta = val - stats->mean;
104 stats->mean += delta / stats->n;
105 stats->M2 += delta*(val - stats->mean);
106 }
107
108 static double avg_stats(struct stats *stats)
109 {
110 return stats->mean;
111 }
112
113 /*
114 * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
115 *
116 * (\Sum n_i^2) - ((\Sum n_i)^2)/n
117 * s^2 = -------------------------------
118 * n - 1
119 *
120 * http://en.wikipedia.org/wiki/Stddev
121 *
122 * The std dev of the mean is related to the std dev by:
123 *
124 * s
125 * s_mean = -------
126 * sqrt(n)
127 *
128 */
129 static double stddev_stats(struct stats *stats)
130 {
131 double variance = stats->M2 / (stats->n - 1);
132 double variance_mean = variance / stats->n;
133
134 return sqrt(variance_mean);
135 }
136
137 struct stats event_res_stats[MAX_COUNTERS][3];
138 struct stats runtime_nsecs_stats;
139 struct stats walltime_nsecs_stats;
140 struct stats runtime_cycles_stats;
141 struct stats runtime_branches_stats;
142
143 #define MATCH_EVENT(t, c, counter) \
144 (attrs[counter].type == PERF_TYPE_##t && \
145 attrs[counter].config == PERF_COUNT_##c)
146
147 #define ERR_PERF_OPEN \
148 "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n"
149
150 static int create_perf_stat_counter(int counter)
151 {
152 struct perf_event_attr *attr = attrs + counter;
153 int thread;
154 int ncreated = 0;
155
156 if (scale)
157 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
158 PERF_FORMAT_TOTAL_TIME_RUNNING;
159
160 if (system_wide) {
161 unsigned int cpu;
162
163 for (cpu = 0; cpu < nr_cpus; cpu++) {
164 fd[cpu][counter][0] = sys_perf_event_open(attr,
165 -1, cpumap[cpu], -1, 0);
166 if (fd[cpu][counter][0] < 0)
167 pr_debug(ERR_PERF_OPEN, counter,
168 fd[cpu][counter][0], strerror(errno));
169 else
170 ++ncreated;
171 }
172 } else {
173 attr->inherit = !no_inherit;
174 if (target_pid == -1 && target_tid == -1) {
175 attr->disabled = 1;
176 attr->enable_on_exec = 1;
177 }
178 for (thread = 0; thread < thread_num; thread++) {
179 fd[0][counter][thread] = sys_perf_event_open(attr,
180 all_tids[thread], -1, -1, 0);
181 if (fd[0][counter][thread] < 0)
182 pr_debug(ERR_PERF_OPEN, counter,
183 fd[0][counter][thread],
184 strerror(errno));
185 else
186 ++ncreated;
187 }
188 }
189
190 return ncreated;
191 }
192
193 /*
194 * Does the counter have nsecs as a unit?
195 */
196 static inline int nsec_counter(int counter)
197 {
198 if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
199 MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
200 return 1;
201
202 return 0;
203 }
204
205 /*
206 * Read out the results of a single counter:
207 */
208 static void read_counter(int counter)
209 {
210 u64 count[3], single_count[3];
211 unsigned int cpu;
212 size_t res, nv;
213 int scaled;
214 int i, thread;
215
216 count[0] = count[1] = count[2] = 0;
217
218 nv = scale ? 3 : 1;
219 for (cpu = 0; cpu < nr_cpus; cpu++) {
220 for (thread = 0; thread < thread_num; thread++) {
221 if (fd[cpu][counter][thread] < 0)
222 continue;
223
224 res = read(fd[cpu][counter][thread],
225 single_count, nv * sizeof(u64));
226 assert(res == nv * sizeof(u64));
227
228 close(fd[cpu][counter][thread]);
229 fd[cpu][counter][thread] = -1;
230
231 count[0] += single_count[0];
232 if (scale) {
233 count[1] += single_count[1];
234 count[2] += single_count[2];
235 }
236 }
237 }
238
239 scaled = 0;
240 if (scale) {
241 if (count[2] == 0) {
242 event_scaled[counter] = -1;
243 count[0] = 0;
244 return;
245 }
246
247 if (count[2] < count[1]) {
248 event_scaled[counter] = 1;
249 count[0] = (unsigned long long)
250 ((double)count[0] * count[1] / count[2] + 0.5);
251 }
252 }
253
254 for (i = 0; i < 3; i++)
255 update_stats(&event_res_stats[counter][i], count[i]);
256
257 if (verbose) {
258 fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter),
259 count[0], count[1], count[2]);
260 }
261
262 /*
263 * Save the full runtime - to allow normalization during printout:
264 */
265 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
266 update_stats(&runtime_nsecs_stats, count[0]);
267 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
268 update_stats(&runtime_cycles_stats, count[0]);
269 if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter))
270 update_stats(&runtime_branches_stats, count[0]);
271 }
272
273 static int run_perf_stat(int argc __used, const char **argv)
274 {
275 unsigned long long t0, t1;
276 int status = 0;
277 int counter, ncreated = 0;
278 int child_ready_pipe[2], go_pipe[2];
279 const bool forks = (argc > 0);
280 char buf;
281
282 if (!system_wide)
283 nr_cpus = 1;
284
285 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
286 perror("failed to create pipes");
287 exit(1);
288 }
289
290 if (forks) {
291 if ((child_pid = fork()) < 0)
292 perror("failed to fork");
293
294 if (!child_pid) {
295 close(child_ready_pipe[0]);
296 close(go_pipe[1]);
297 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
298
299 /*
300 * Do a dummy execvp to get the PLT entry resolved,
301 * so we avoid the resolver overhead on the real
302 * execvp call.
303 */
304 execvp("", (char **)argv);
305
306 /*
307 * Tell the parent we're ready to go
308 */
309 close(child_ready_pipe[1]);
310
311 /*
312 * Wait until the parent tells us to go.
313 */
314 if (read(go_pipe[0], &buf, 1) == -1)
315 perror("unable to read pipe");
316
317 execvp(argv[0], (char **)argv);
318
319 perror(argv[0]);
320 exit(-1);
321 }
322
323 if (target_tid == -1 && target_pid == -1 && !system_wide)
324 all_tids[0] = child_pid;
325
326 /*
327 * Wait for the child to be ready to exec.
328 */
329 close(child_ready_pipe[1]);
330 close(go_pipe[0]);
331 if (read(child_ready_pipe[0], &buf, 1) == -1)
332 perror("unable to read pipe");
333 close(child_ready_pipe[0]);
334 }
335
336 for (counter = 0; counter < nr_counters; counter++)
337 ncreated += create_perf_stat_counter(counter);
338
339 if (ncreated == 0) {
340 pr_err("No permission to collect %sstats.\n"
341 "Consider tweaking /proc/sys/kernel/perf_event_paranoid.\n",
342 system_wide ? "system-wide " : "");
343 if (child_pid != -1)
344 kill(child_pid, SIGTERM);
345 return -1;
346 }
347
348 /*
349 * Enable counters and exec the command:
350 */
351 t0 = rdclock();
352
353 if (forks) {
354 close(go_pipe[1]);
355 wait(&status);
356 } else {
357 while(!done) sleep(1);
358 }
359
360 t1 = rdclock();
361
362 update_stats(&walltime_nsecs_stats, t1 - t0);
363
364 for (counter = 0; counter < nr_counters; counter++)
365 read_counter(counter);
366
367 return WEXITSTATUS(status);
368 }
369
370 static void print_noise(int counter, double avg)
371 {
372 if (run_count == 1)
373 return;
374
375 fprintf(stderr, " ( +- %7.3f%% )",
376 100 * stddev_stats(&event_res_stats[counter][0]) / avg);
377 }
378
379 static void nsec_printout(int counter, double avg)
380 {
381 double msecs = avg / 1e6;
382
383 fprintf(stderr, " %18.6f %-24s", msecs, event_name(counter));
384
385 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
386 fprintf(stderr, " # %10.3f CPUs ",
387 avg / avg_stats(&walltime_nsecs_stats));
388 }
389 }
390
391 static void abs_printout(int counter, double avg)
392 {
393 double total, ratio = 0.0;
394
395 if (big_num)
396 fprintf(stderr, " %'18.0f %-24s", avg, event_name(counter));
397 else
398 fprintf(stderr, " %18.0f %-24s", avg, event_name(counter));
399
400 if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
401 total = avg_stats(&runtime_cycles_stats);
402
403 if (total)
404 ratio = avg / total;
405
406 fprintf(stderr, " # %10.3f IPC ", ratio);
407 } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) &&
408 runtime_branches_stats.n != 0) {
409 total = avg_stats(&runtime_branches_stats);
410
411 if (total)
412 ratio = avg * 100 / total;
413
414 fprintf(stderr, " # %10.3f %% ", ratio);
415
416 } else if (runtime_nsecs_stats.n != 0) {
417 total = avg_stats(&runtime_nsecs_stats);
418
419 if (total)
420 ratio = 1000.0 * avg / total;
421
422 fprintf(stderr, " # %10.3f M/sec", ratio);
423 }
424 }
425
426 /*
427 * Print out the results of a single counter:
428 */
429 static void print_counter(int counter)
430 {
431 double avg = avg_stats(&event_res_stats[counter][0]);
432 int scaled = event_scaled[counter];
433
434 if (scaled == -1) {
435 fprintf(stderr, " %18s %-24s\n",
436 "<not counted>", event_name(counter));
437 return;
438 }
439
440 if (nsec_counter(counter))
441 nsec_printout(counter, avg);
442 else
443 abs_printout(counter, avg);
444
445 print_noise(counter, avg);
446
447 if (scaled) {
448 double avg_enabled, avg_running;
449
450 avg_enabled = avg_stats(&event_res_stats[counter][1]);
451 avg_running = avg_stats(&event_res_stats[counter][2]);
452
453 fprintf(stderr, " (scaled from %.2f%%)",
454 100 * avg_running / avg_enabled);
455 }
456
457 fprintf(stderr, "\n");
458 }
459
460 static void print_stat(int argc, const char **argv)
461 {
462 int i, counter;
463
464 fflush(stdout);
465
466 fprintf(stderr, "\n");
467 fprintf(stderr, " Performance counter stats for ");
468 if(target_pid == -1 && target_tid == -1) {
469 fprintf(stderr, "\'%s", argv[0]);
470 for (i = 1; i < argc; i++)
471 fprintf(stderr, " %s", argv[i]);
472 } else if (target_pid != -1)
473 fprintf(stderr, "process id \'%d", target_pid);
474 else
475 fprintf(stderr, "thread id \'%d", target_tid);
476
477 fprintf(stderr, "\'");
478 if (run_count > 1)
479 fprintf(stderr, " (%d runs)", run_count);
480 fprintf(stderr, ":\n\n");
481
482 for (counter = 0; counter < nr_counters; counter++)
483 print_counter(counter);
484
485 fprintf(stderr, "\n");
486 fprintf(stderr, " %18.9f seconds time elapsed",
487 avg_stats(&walltime_nsecs_stats)/1e9);
488 if (run_count > 1) {
489 fprintf(stderr, " ( +- %7.3f%% )",
490 100*stddev_stats(&walltime_nsecs_stats) /
491 avg_stats(&walltime_nsecs_stats));
492 }
493 fprintf(stderr, "\n\n");
494 }
495
496 static volatile int signr = -1;
497
498 static void skip_signal(int signo)
499 {
500 if(child_pid == -1)
501 done = 1;
502
503 signr = signo;
504 }
505
506 static void sig_atexit(void)
507 {
508 if (child_pid != -1)
509 kill(child_pid, SIGTERM);
510
511 if (signr == -1)
512 return;
513
514 signal(signr, SIG_DFL);
515 kill(getpid(), signr);
516 }
517
518 static const char * const stat_usage[] = {
519 "perf stat [<options>] [<command>]",
520 NULL
521 };
522
523 static const struct option options[] = {
524 OPT_CALLBACK('e', "event", NULL, "event",
525 "event selector. use 'perf list' to list available events",
526 parse_events),
527 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
528 "child tasks do not inherit counters"),
529 OPT_INTEGER('p', "pid", &target_pid,
530 "stat events on existing process id"),
531 OPT_INTEGER('t', "tid", &target_tid,
532 "stat events on existing thread id"),
533 OPT_BOOLEAN('a', "all-cpus", &system_wide,
534 "system-wide collection from all CPUs"),
535 OPT_BOOLEAN('c', "scale", &scale,
536 "scale/normalize counters"),
537 OPT_INCR('v', "verbose", &verbose,
538 "be more verbose (show counter open errors, etc)"),
539 OPT_INTEGER('r', "repeat", &run_count,
540 "repeat command and print average + stddev (max: 100)"),
541 OPT_BOOLEAN('n', "null", &null_run,
542 "null run - dont start any counters"),
543 OPT_BOOLEAN('B', "big-num", &big_num,
544 "print large numbers with thousands\' separators"),
545 OPT_END()
546 };
547
548 int cmd_stat(int argc, const char **argv, const char *prefix __used)
549 {
550 int status;
551 int i,j;
552
553 setlocale(LC_ALL, "");
554
555 argc = parse_options(argc, argv, options, stat_usage,
556 PARSE_OPT_STOP_AT_NON_OPTION);
557 if (!argc && target_pid == -1 && target_tid == -1)
558 usage_with_options(stat_usage, options);
559 if (run_count <= 0)
560 usage_with_options(stat_usage, options);
561
562 /* Set attrs and nr_counters if no event is selected and !null_run */
563 if (!null_run && !nr_counters) {
564 memcpy(attrs, default_attrs, sizeof(default_attrs));
565 nr_counters = ARRAY_SIZE(default_attrs);
566 }
567
568 if (system_wide)
569 nr_cpus = read_cpu_map();
570 else
571 nr_cpus = 1;
572
573 if (target_pid != -1) {
574 target_tid = target_pid;
575 thread_num = find_all_tid(target_pid, &all_tids);
576 if (thread_num <= 0) {
577 fprintf(stderr, "Can't find all threads of pid %d\n",
578 target_pid);
579 usage_with_options(stat_usage, options);
580 }
581 } else {
582 all_tids=malloc(sizeof(pid_t));
583 if (!all_tids)
584 return -ENOMEM;
585
586 all_tids[0] = target_tid;
587 thread_num = 1;
588 }
589
590 for (i = 0; i < MAX_NR_CPUS; i++) {
591 for (j = 0; j < MAX_COUNTERS; j++) {
592 fd[i][j] = malloc(sizeof(int)*thread_num);
593 if (!fd[i][j])
594 return -ENOMEM;
595 }
596 }
597
598 /*
599 * We dont want to block the signals - that would cause
600 * child tasks to inherit that and Ctrl-C would not work.
601 * What we want is for Ctrl-C to work in the exec()-ed
602 * task, but being ignored by perf stat itself:
603 */
604 atexit(sig_atexit);
605 signal(SIGINT, skip_signal);
606 signal(SIGALRM, skip_signal);
607 signal(SIGABRT, skip_signal);
608
609 status = 0;
610 for (run_idx = 0; run_idx < run_count; run_idx++) {
611 if (run_count != 1 && verbose)
612 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
613 status = run_perf_stat(argc, argv);
614 }
615
616 if (status != -1)
617 print_stat(argc, argv);
618
619 return status;
620 }
AMDTP streaming driver for the Linux FireWire stack (Juju)