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RT-AC56 3.0.0.4.374.37 core
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / tools / perf / builtin-stat.c
bloba6b4d44f950246e27d4cb6b0bc3e6d5afd27adcc
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 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 static const char *cpu_list;
86
87
88 static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
89
90 static int event_scaled[MAX_COUNTERS];
91
92 static volatile int done = 0;
93
94 struct stats
95 {
96 double n, mean, M2;
97 };
98
99 static void update_stats(struct stats *stats, u64 val)
100 {
101 double delta;
102
103 stats->n++;
104 delta = val - stats->mean;
105 stats->mean += delta / stats->n;
106 stats->M2 += delta*(val - stats->mean);
107 }
108
109 static double avg_stats(struct stats *stats)
110 {
111 return stats->mean;
112 }
113
114 /*
115 * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
116 *
117 * (\Sum n_i^2) - ((\Sum n_i)^2)/n
118 * s^2 = -------------------------------
119 * n - 1
120 *
121 * http://en.wikipedia.org/wiki/Stddev
122 *
123 * The std dev of the mean is related to the std dev by:
124 *
125 * s
126 * s_mean = -------
127 * sqrt(n)
128 *
129 */
130 static double stddev_stats(struct stats *stats)
131 {
132 double variance = stats->M2 / (stats->n - 1);
133 double variance_mean = variance / stats->n;
134
135 return sqrt(variance_mean);
136 }
137
138 struct stats event_res_stats[MAX_COUNTERS][3];
139 struct stats runtime_nsecs_stats;
140 struct stats walltime_nsecs_stats;
141 struct stats runtime_cycles_stats;
142 struct stats runtime_branches_stats;
143
144 #define MATCH_EVENT(t, c, counter) \
145 (attrs[counter].type == PERF_TYPE_##t && \
146 attrs[counter].config == PERF_COUNT_##c)
147
148 #define ERR_PERF_OPEN \
149 "Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n"
150
151 static int create_perf_stat_counter(int counter)
152 {
153 struct perf_event_attr *attr = attrs + counter;
154 int thread;
155 int ncreated = 0;
156
157 if (scale)
158 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
159 PERF_FORMAT_TOTAL_TIME_RUNNING;
160
161 if (system_wide) {
162 int cpu;
163
164 for (cpu = 0; cpu < nr_cpus; cpu++) {
165 fd[cpu][counter][0] = sys_perf_event_open(attr,
166 -1, cpumap[cpu], -1, 0);
167 if (fd[cpu][counter][0] < 0)
168 pr_debug(ERR_PERF_OPEN, counter,
169 fd[cpu][counter][0], strerror(errno));
170 else
171 ++ncreated;
172 }
173 } else {
174 attr->inherit = !no_inherit;
175 if (target_pid == -1 && target_tid == -1) {
176 attr->disabled = 1;
177 attr->enable_on_exec = 1;
178 }
179 for (thread = 0; thread < thread_num; thread++) {
180 fd[0][counter][thread] = sys_perf_event_open(attr,
181 all_tids[thread], -1, -1, 0);
182 if (fd[0][counter][thread] < 0)
183 pr_debug(ERR_PERF_OPEN, counter,
184 fd[0][counter][thread],
185 strerror(errno));
186 else
187 ++ncreated;
188 }
189 }
190
191 return ncreated;
192 }
193
194 /*
195 * Does the counter have nsecs as a unit?
196 */
197 static inline int nsec_counter(int counter)
198 {
199 if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
200 MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
201 return 1;
202
203 return 0;
204 }
205
206 /*
207 * Read out the results of a single counter:
208 */
209 static void read_counter(int counter)
210 {
211 u64 count[3], single_count[3];
212 int cpu;
213 size_t res, nv;
214 int scaled;
215 int i, thread;
216
217 count[0] = count[1] = count[2] = 0;
218
219 nv = scale ? 3 : 1;
220 for (cpu = 0; cpu < nr_cpus; cpu++) {
221 for (thread = 0; thread < thread_num; thread++) {
222 if (fd[cpu][counter][thread] < 0)
223 continue;
224
225 res = read(fd[cpu][counter][thread],
226 single_count, nv * sizeof(u64));
227 assert(res == nv * sizeof(u64));
228
229 close(fd[cpu][counter][thread]);
230 fd[cpu][counter][thread] = -1;
231
232 count[0] += single_count[0];
233 if (scale) {
234 count[1] += single_count[1];
235 count[2] += single_count[2];
236 }
237 }
238 }
239
240 scaled = 0;
241 if (scale) {
242 if (count[2] == 0) {
243 event_scaled[counter] = -1;
244 count[0] = 0;
245 return;
246 }
247
248 if (count[2] < count[1]) {
249 event_scaled[counter] = 1;
250 count[0] = (unsigned long long)
251 ((double)count[0] * count[1] / count[2] + 0.5);
252 }
253 }
254
255 for (i = 0; i < 3; i++)
256 update_stats(&event_res_stats[counter][i], count[i]);
257
258 if (verbose) {
259 fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter),
260 count[0], count[1], count[2]);
261 }
262
263 /*
264 * Save the full runtime - to allow normalization during printout:
265 */
266 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
267 update_stats(&runtime_nsecs_stats, count[0]);
268 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
269 update_stats(&runtime_cycles_stats, count[0]);
270 if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter))
271 update_stats(&runtime_branches_stats, count[0]);
272 }
273
274 static int run_perf_stat(int argc __used, const char **argv)
275 {
276 unsigned long long t0, t1;
277 int status = 0;
278 int counter, ncreated = 0;
279 int child_ready_pipe[2], go_pipe[2];
280 const bool forks = (argc > 0);
281 char buf;
282
283 if (!system_wide)
284 nr_cpus = 1;
285
286 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
287 perror("failed to create pipes");
288 exit(1);
289 }
290
291 if (forks) {
292 if ((child_pid = fork()) < 0)
293 perror("failed to fork");
294
295 if (!child_pid) {
296 close(child_ready_pipe[0]);
297 close(go_pipe[1]);
298 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
299
300 /*
301 * Do a dummy execvp to get the PLT entry resolved,
302 * so we avoid the resolver overhead on the real
303 * execvp call.
304 */
305 execvp("", (char **)argv);
306
307 /*
308 * Tell the parent we're ready to go
309 */
310 close(child_ready_pipe[1]);
311
312 /*
313 * Wait until the parent tells us to go.
314 */
315 if (read(go_pipe[0], &buf, 1) == -1)
316 perror("unable to read pipe");
317
318 execvp(argv[0], (char **)argv);
319
320 perror(argv[0]);
321 exit(-1);
322 }
323
324 if (target_tid == -1 && target_pid == -1 && !system_wide)
325 all_tids[0] = child_pid;
326
327 /*
328 * Wait for the child to be ready to exec.
329 */
330 close(child_ready_pipe[1]);
331 close(go_pipe[0]);
332 if (read(child_ready_pipe[0], &buf, 1) == -1)
333 perror("unable to read pipe");
334 close(child_ready_pipe[0]);
335 }
336
337 for (counter = 0; counter < nr_counters; counter++)
338 ncreated += create_perf_stat_counter(counter);
339
340 if (ncreated == 0) {
341 pr_err("No permission to collect %sstats.\n"
342 "Consider tweaking /proc/sys/kernel/perf_event_paranoid.\n",
343 system_wide ? "system-wide " : "");
344 if (child_pid != -1)
345 kill(child_pid, SIGTERM);
346 return -1;
347 }
348
349 /*
350 * Enable counters and exec the command:
351 */
352 t0 = rdclock();
353
354 if (forks) {
355 close(go_pipe[1]);
356 wait(&status);
357 } else {
358 while(!done) sleep(1);
359 }
360
361 t1 = rdclock();
362
363 update_stats(&walltime_nsecs_stats, t1 - t0);
364
365 for (counter = 0; counter < nr_counters; counter++)
366 read_counter(counter);
367
368 return WEXITSTATUS(status);
369 }
370
371 static void print_noise(int counter, double avg)
372 {
373 if (run_count == 1)
374 return;
375
376 fprintf(stderr, " ( +- %7.3f%% )",
377 100 * stddev_stats(&event_res_stats[counter][0]) / avg);
378 }
379
380 static void nsec_printout(int counter, double avg)
381 {
382 double msecs = avg / 1e6;
383
384 fprintf(stderr, " %18.6f %-24s", msecs, event_name(counter));
385
386 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
387 fprintf(stderr, " # %10.3f CPUs ",
388 avg / avg_stats(&walltime_nsecs_stats));
389 }
390 }
391
392 static void abs_printout(int counter, double avg)
393 {
394 double total, ratio = 0.0;
395
396 if (big_num)
397 fprintf(stderr, " %'18.0f %-24s", avg, event_name(counter));
398 else
399 fprintf(stderr, " %18.0f %-24s", avg, event_name(counter));
400
401 if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
402 total = avg_stats(&runtime_cycles_stats);
403
404 if (total)
405 ratio = avg / total;
406
407 fprintf(stderr, " # %10.3f IPC ", ratio);
408 } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) &&
409 runtime_branches_stats.n != 0) {
410 total = avg_stats(&runtime_branches_stats);
411
412 if (total)
413 ratio = avg * 100 / total;
414
415 fprintf(stderr, " # %10.3f %% ", ratio);
416
417 } else if (runtime_nsecs_stats.n != 0) {
418 total = avg_stats(&runtime_nsecs_stats);
419
420 if (total)
421 ratio = 1000.0 * avg / total;
422
423 fprintf(stderr, " # %10.3f M/sec", ratio);
424 }
425 }
426
427 /*
428 * Print out the results of a single counter:
429 */
430 static void print_counter(int counter)
431 {
432 double avg = avg_stats(&event_res_stats[counter][0]);
433 int scaled = event_scaled[counter];
434
435 if (scaled == -1) {
436 fprintf(stderr, " %18s %-24s\n",
437 "<not counted>", event_name(counter));
438 return;
439 }
440
441 if (nsec_counter(counter))
442 nsec_printout(counter, avg);
443 else
444 abs_printout(counter, avg);
445
446 print_noise(counter, avg);
447
448 if (scaled) {
449 double avg_enabled, avg_running;
450
451 avg_enabled = avg_stats(&event_res_stats[counter][1]);
452 avg_running = avg_stats(&event_res_stats[counter][2]);
453
454 fprintf(stderr, " (scaled from %.2f%%)",
455 100 * avg_running / avg_enabled);
456 }
457
458 fprintf(stderr, "\n");
459 }
460
461 static void print_stat(int argc, const char **argv)
462 {
463 int i, counter;
464
465 fflush(stdout);
466
467 fprintf(stderr, "\n");
468 fprintf(stderr, " Performance counter stats for ");
469 if(target_pid == -1 && target_tid == -1) {
470 fprintf(stderr, "\'%s", argv[0]);
471 for (i = 1; i < argc; i++)
472 fprintf(stderr, " %s", argv[i]);
473 } else if (target_pid != -1)
474 fprintf(stderr, "process id \'%d", target_pid);
475 else
476 fprintf(stderr, "thread id \'%d", target_tid);
477
478 fprintf(stderr, "\'");
479 if (run_count > 1)
480 fprintf(stderr, " (%d runs)", run_count);
481 fprintf(stderr, ":\n\n");
482
483 for (counter = 0; counter < nr_counters; counter++)
484 print_counter(counter);
485
486 fprintf(stderr, "\n");
487 fprintf(stderr, " %18.9f seconds time elapsed",
488 avg_stats(&walltime_nsecs_stats)/1e9);
489 if (run_count > 1) {
490 fprintf(stderr, " ( +- %7.3f%% )",
491 100*stddev_stats(&walltime_nsecs_stats) /
492 avg_stats(&walltime_nsecs_stats));
493 }
494 fprintf(stderr, "\n\n");
495 }
496
497 static volatile int signr = -1;
498
499 static void skip_signal(int signo)
500 {
501 if(child_pid == -1)
502 done = 1;
503
504 signr = signo;
505 }
506
507 static void sig_atexit(void)
508 {
509 if (child_pid != -1)
510 kill(child_pid, SIGTERM);
511
512 if (signr == -1)
513 return;
514
515 signal(signr, SIG_DFL);
516 kill(getpid(), signr);
517 }
518
519 static const char * const stat_usage[] = {
520 "perf stat [<options>] [<command>]",
521 NULL
522 };
523
524 static const struct option options[] = {
525 OPT_CALLBACK('e', "event", NULL, "event",
526 "event selector. use 'perf list' to list available events",
527 parse_events),
528 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
529 "child tasks do not inherit counters"),
530 OPT_INTEGER('p', "pid", &target_pid,
531 "stat events on existing process id"),
532 OPT_INTEGER('t', "tid", &target_tid,
533 "stat events on existing thread id"),
534 OPT_BOOLEAN('a', "all-cpus", &system_wide,
535 "system-wide collection from all CPUs"),
536 OPT_BOOLEAN('c', "scale", &scale,
537 "scale/normalize counters"),
538 OPT_INCR('v', "verbose", &verbose,
539 "be more verbose (show counter open errors, etc)"),
540 OPT_INTEGER('r', "repeat", &run_count,
541 "repeat command and print average + stddev (max: 100)"),
542 OPT_BOOLEAN('n', "null", &null_run,
543 "null run - dont start any counters"),
544 OPT_BOOLEAN('B', "big-num", &big_num,
545 "print large numbers with thousands\' separators"),
546 OPT_STRING('C', "cpu", &cpu_list, "cpu",
547 "list of cpus to monitor in system-wide"),
548 OPT_END()
549 };
550
551 int cmd_stat(int argc, const char **argv, const char *prefix __used)
552 {
553 int status;
554 int i,j;
555
556 setlocale(LC_ALL, "");
557
558 argc = parse_options(argc, argv, options, stat_usage,
559 PARSE_OPT_STOP_AT_NON_OPTION);
560 if (!argc && target_pid == -1 && target_tid == -1)
561 usage_with_options(stat_usage, options);
562 if (run_count <= 0)
563 usage_with_options(stat_usage, options);
564
565 /* Set attrs and nr_counters if no event is selected and !null_run */
566 if (!null_run && !nr_counters) {
567 memcpy(attrs, default_attrs, sizeof(default_attrs));
568 nr_counters = ARRAY_SIZE(default_attrs);
569 }
570
571 if (system_wide)
572 nr_cpus = read_cpu_map(cpu_list);
573 else
574 nr_cpus = 1;
575
576 if (nr_cpus < 1)
577 usage_with_options(stat_usage, options);
578
579 if (target_pid != -1) {
580 target_tid = target_pid;
581 thread_num = find_all_tid(target_pid, &all_tids);
582 if (thread_num <= 0) {
583 fprintf(stderr, "Can't find all threads of pid %d\n",
584 target_pid);
585 usage_with_options(stat_usage, options);
586 }
587 } else {
588 all_tids=malloc(sizeof(pid_t));
589 if (!all_tids)
590 return -ENOMEM;
591
592 all_tids[0] = target_tid;
593 thread_num = 1;
594 }
595
596 for (i = 0; i < MAX_NR_CPUS; i++) {
597 for (j = 0; j < MAX_COUNTERS; j++) {
598 fd[i][j] = malloc(sizeof(int)*thread_num);
599 if (!fd[i][j])
600 return -ENOMEM;
601 }
602 }
603
604 /*
605 * We dont want to block the signals - that would cause
606 * child tasks to inherit that and Ctrl-C would not work.
607 * What we want is for Ctrl-C to work in the exec()-ed
608 * task, but being ignored by perf stat itself:
609 */
610 atexit(sig_atexit);
611 signal(SIGINT, skip_signal);
612 signal(SIGALRM, skip_signal);
613 signal(SIGABRT, skip_signal);
614
615 status = 0;
616 for (run_idx = 0; run_idx < run_count; run_idx++) {
617 if (run_count != 1 && verbose)
618 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
619 status = run_perf_stat(argc, argv);
620 }
621
622 if (status != -1)
623 print_stat(argc, argv);
624
625 return status;
626 }
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