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KVM: Prevent kvm_init from corrupting debugfs structures
[linux-2.6/verdex.git] / tools / perf / builtin-stat.c
blobe874ad447ff988f843ba5f86cde91c01e1517db5
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
46 #include <sys/prctl.h>
47 #include <math.h>
48
49 static struct perf_counter_attr default_attrs[] = {
50
51 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
52 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES},
53 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
54 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
55
56 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
57 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
58 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
59 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
60
61 };
62
63 #define MAX_RUN 100
64
65 static int system_wide = 0;
66 static int verbose = 0;
67 static unsigned int nr_cpus = 0;
68 static int run_idx = 0;
69
70 static int run_count = 1;
71 static int inherit = 1;
72 static int scale = 1;
73 static int target_pid = -1;
74 static int null_run = 0;
75
76 static int fd[MAX_NR_CPUS][MAX_COUNTERS];
77
78 static u64 runtime_nsecs[MAX_RUN];
79 static u64 walltime_nsecs[MAX_RUN];
80 static u64 runtime_cycles[MAX_RUN];
81
82 static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
83 static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
84
85 struct stats
86 {
87 double sum;
88 double sum_sq;
89 };
90
91 static double avg_stats(struct stats *stats)
92 {
93 return stats->sum / run_count;
94 }
95
96 /*
97 * stddev = sqrt(1/N (\Sum n_i^2) - avg(n)^2)
98 */
99 static double stddev_stats(struct stats *stats)
100 {
101 double avg = stats->sum / run_count;
102
103 return sqrt(stats->sum_sq/run_count - avg*avg);
104 }
105
106 struct stats event_res_stats[MAX_COUNTERS][3];
107 struct stats event_scaled_stats[MAX_COUNTERS];
108 struct stats runtime_nsecs_stats;
109 struct stats walltime_nsecs_stats;
110 struct stats runtime_cycles_stats;
111
112 #define MATCH_EVENT(t, c, counter) \
113 (attrs[counter].type == PERF_TYPE_##t && \
114 attrs[counter].config == PERF_COUNT_##c)
115
116 #define ERR_PERF_OPEN \
117 "Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n"
118
119 static void create_perf_stat_counter(int counter, int pid)
120 {
121 struct perf_counter_attr *attr = attrs + counter;
122
123 if (scale)
124 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
125 PERF_FORMAT_TOTAL_TIME_RUNNING;
126
127 if (system_wide) {
128 unsigned int cpu;
129
130 for (cpu = 0; cpu < nr_cpus; cpu++) {
131 fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
132 if (fd[cpu][counter] < 0 && verbose)
133 fprintf(stderr, ERR_PERF_OPEN, counter,
134 fd[cpu][counter], strerror(errno));
135 }
136 } else {
137 attr->inherit = inherit;
138 attr->disabled = 1;
139 attr->enable_on_exec = 1;
140
141 fd[0][counter] = sys_perf_counter_open(attr, pid, -1, -1, 0);
142 if (fd[0][counter] < 0 && verbose)
143 fprintf(stderr, ERR_PERF_OPEN, counter,
144 fd[0][counter], strerror(errno));
145 }
146 }
147
148 /*
149 * Does the counter have nsecs as a unit?
150 */
151 static inline int nsec_counter(int counter)
152 {
153 if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
154 MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
155 return 1;
156
157 return 0;
158 }
159
160 /*
161 * Read out the results of a single counter:
162 */
163 static void read_counter(int counter)
164 {
165 u64 *count, single_count[3];
166 unsigned int cpu;
167 size_t res, nv;
168 int scaled;
169
170 count = event_res[run_idx][counter];
171
172 count[0] = count[1] = count[2] = 0;
173
174 nv = scale ? 3 : 1;
175 for (cpu = 0; cpu < nr_cpus; cpu++) {
176 if (fd[cpu][counter] < 0)
177 continue;
178
179 res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
180 assert(res == nv * sizeof(u64));
181
182 close(fd[cpu][counter]);
183 fd[cpu][counter] = -1;
184
185 count[0] += single_count[0];
186 if (scale) {
187 count[1] += single_count[1];
188 count[2] += single_count[2];
189 }
190 }
191
192 scaled = 0;
193 if (scale) {
194 if (count[2] == 0) {
195 event_scaled[run_idx][counter] = -1;
196 count[0] = 0;
197 return;
198 }
199
200 if (count[2] < count[1]) {
201 event_scaled[run_idx][counter] = 1;
202 count[0] = (unsigned long long)
203 ((double)count[0] * count[1] / count[2] + 0.5);
204 }
205 }
206 /*
207 * Save the full runtime - to allow normalization during printout:
208 */
209 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
210 runtime_nsecs[run_idx] = count[0];
211 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
212 runtime_cycles[run_idx] = count[0];
213 }
214
215 static int run_perf_stat(int argc __used, const char **argv)
216 {
217 unsigned long long t0, t1;
218 int status = 0;
219 int counter;
220 int pid;
221 int child_ready_pipe[2], go_pipe[2];
222 char buf;
223
224 if (!system_wide)
225 nr_cpus = 1;
226
227 if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
228 perror("failed to create pipes");
229 exit(1);
230 }
231
232 if ((pid = fork()) < 0)
233 perror("failed to fork");
234
235 if (!pid) {
236 close(child_ready_pipe[0]);
237 close(go_pipe[1]);
238 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
239
240 /*
241 * Do a dummy execvp to get the PLT entry resolved,
242 * so we avoid the resolver overhead on the real
243 * execvp call.
244 */
245 execvp("", (char **)argv);
246
247 /*
248 * Tell the parent we're ready to go
249 */
250 close(child_ready_pipe[1]);
251
252 /*
253 * Wait until the parent tells us to go.
254 */
255 if (read(go_pipe[0], &buf, 1) == -1)
256 perror("unable to read pipe");
257
258 execvp(argv[0], (char **)argv);
259
260 perror(argv[0]);
261 exit(-1);
262 }
263
264 /*
265 * Wait for the child to be ready to exec.
266 */
267 close(child_ready_pipe[1]);
268 close(go_pipe[0]);
269 if (read(child_ready_pipe[0], &buf, 1) == -1)
270 perror("unable to read pipe");
271 close(child_ready_pipe[0]);
272
273 for (counter = 0; counter < nr_counters; counter++)
274 create_perf_stat_counter(counter, pid);
275
276 /*
277 * Enable counters and exec the command:
278 */
279 t0 = rdclock();
280
281 close(go_pipe[1]);
282 wait(&status);
283
284 t1 = rdclock();
285
286 walltime_nsecs[run_idx] = t1 - t0;
287
288 for (counter = 0; counter < nr_counters; counter++)
289 read_counter(counter);
290
291 return WEXITSTATUS(status);
292 }
293
294 static void print_noise(double avg, double stddev)
295 {
296 if (run_count > 1)
297 fprintf(stderr, " ( +- %7.3f%% )", 100*stddev / avg);
298 }
299
300 static void nsec_printout(int counter, double avg, double stddev)
301 {
302 double msecs = avg / 1e6;
303
304 fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
305
306 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
307 fprintf(stderr, " # %10.3f CPUs ",
308 avg / avg_stats(&walltime_nsecs_stats));
309 }
310 print_noise(avg, stddev);
311 }
312
313 static void abs_printout(int counter, double avg, double stddev)
314 {
315 fprintf(stderr, " %14.0f %-24s", avg, event_name(counter));
316
317 if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
318 fprintf(stderr, " # %10.3f IPC ",
319 avg / avg_stats(&runtime_cycles_stats));
320 } else {
321 fprintf(stderr, " # %10.3f M/sec",
322 1000.0 * avg / avg_stats(&runtime_nsecs_stats));
323 }
324 print_noise(avg, stddev);
325 }
326
327 /*
328 * Print out the results of a single counter:
329 */
330 static void print_counter(int counter)
331 {
332 double avg, stddev;
333 int scaled;
334
335 avg = avg_stats(&event_res_stats[counter][0]);
336 stddev = stddev_stats(&event_res_stats[counter][0]);
337 scaled = avg_stats(&event_scaled_stats[counter]);
338
339 if (scaled == -1) {
340 fprintf(stderr, " %14s %-24s\n",
341 "<not counted>", event_name(counter));
342 return;
343 }
344
345 if (nsec_counter(counter))
346 nsec_printout(counter, avg, stddev);
347 else
348 abs_printout(counter, avg, stddev);
349
350 if (scaled) {
351 double avg_enabled, avg_running;
352
353 avg_enabled = avg_stats(&event_res_stats[counter][1]);
354 avg_running = avg_stats(&event_res_stats[counter][2]);
355
356 fprintf(stderr, " (scaled from %.2f%%)",
357 100 * avg_running / avg_enabled);
358 }
359
360 fprintf(stderr, "\n");
361 }
362
363 static void update_stats(const char *name, int idx, struct stats *stats, u64 *val)
364 {
365 double sq = *val;
366
367 stats->sum += *val;
368 stats->sum_sq += sq * sq;
369
370 if (verbose > 1)
371 fprintf(stderr, "debug: %20s[%d]: %Ld\n", name, idx, *val);
372 }
373
374 /*
375 * Calculate the averages and noises:
376 */
377 static void calc_avg(void)
378 {
379 int i, j;
380
381 if (verbose > 1)
382 fprintf(stderr, "\n");
383
384 for (i = 0; i < run_count; i++) {
385 update_stats("runtime", 0, &runtime_nsecs_stats, runtime_nsecs + i);
386 update_stats("walltime", 0, &walltime_nsecs_stats, walltime_nsecs + i);
387 update_stats("runtime_cycles", 0, &runtime_cycles_stats, runtime_cycles + i);
388
389 for (j = 0; j < nr_counters; j++) {
390 update_stats("counter/0", j,
391 event_res_stats[j]+0, event_res[i][j]+0);
392 update_stats("counter/1", j,
393 event_res_stats[j]+1, event_res[i][j]+1);
394 update_stats("counter/2", j,
395 event_res_stats[j]+2, event_res[i][j]+2);
396 if (event_scaled[i][j] != (u64)-1)
397 update_stats("scaled", j,
398 event_scaled_stats + j, event_scaled[i]+j);
399 }
400 }
401 }
402
403 static void print_stat(int argc, const char **argv)
404 {
405 int i, counter;
406
407 calc_avg();
408
409 fflush(stdout);
410
411 fprintf(stderr, "\n");
412 fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
413
414 for (i = 1; i < argc; i++)
415 fprintf(stderr, " %s", argv[i]);
416
417 fprintf(stderr, "\'");
418 if (run_count > 1)
419 fprintf(stderr, " (%d runs)", run_count);
420 fprintf(stderr, ":\n\n");
421
422 for (counter = 0; counter < nr_counters; counter++)
423 print_counter(counter);
424
425 fprintf(stderr, "\n");
426 fprintf(stderr, " %14.9f seconds time elapsed",
427 avg_stats(&walltime_nsecs_stats)/1e9);
428 if (run_count > 1) {
429 fprintf(stderr, " ( +- %7.3f%% )",
430 100*stddev_stats(&walltime_nsecs_stats) /
431 avg_stats(&walltime_nsecs_stats));
432 }
433 fprintf(stderr, "\n\n");
434 }
435
436 static volatile int signr = -1;
437
438 static void skip_signal(int signo)
439 {
440 signr = signo;
441 }
442
443 static void sig_atexit(void)
444 {
445 if (signr == -1)
446 return;
447
448 signal(signr, SIG_DFL);
449 kill(getpid(), signr);
450 }
451
452 static const char * const stat_usage[] = {
453 "perf stat [<options>] <command>",
454 NULL
455 };
456
457 static const struct option options[] = {
458 OPT_CALLBACK('e', "event", NULL, "event",
459 "event selector. use 'perf list' to list available events",
460 parse_events),
461 OPT_BOOLEAN('i', "inherit", &inherit,
462 "child tasks inherit counters"),
463 OPT_INTEGER('p', "pid", &target_pid,
464 "stat events on existing pid"),
465 OPT_BOOLEAN('a', "all-cpus", &system_wide,
466 "system-wide collection from all CPUs"),
467 OPT_BOOLEAN('c', "scale", &scale,
468 "scale/normalize counters"),
469 OPT_BOOLEAN('v', "verbose", &verbose,
470 "be more verbose (show counter open errors, etc)"),
471 OPT_INTEGER('r', "repeat", &run_count,
472 "repeat command and print average + stddev (max: 100)"),
473 OPT_BOOLEAN('n', "null", &null_run,
474 "null run - dont start any counters"),
475 OPT_END()
476 };
477
478 int cmd_stat(int argc, const char **argv, const char *prefix __used)
479 {
480 int status;
481
482 argc = parse_options(argc, argv, options, stat_usage,
483 PARSE_OPT_STOP_AT_NON_OPTION);
484 if (!argc)
485 usage_with_options(stat_usage, options);
486 if (run_count <= 0 || run_count > MAX_RUN)
487 usage_with_options(stat_usage, options);
488
489 /* Set attrs and nr_counters if no event is selected and !null_run */
490 if (!null_run && !nr_counters) {
491 memcpy(attrs, default_attrs, sizeof(default_attrs));
492 nr_counters = ARRAY_SIZE(default_attrs);
493 }
494
495 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
496 assert(nr_cpus <= MAX_NR_CPUS);
497 assert((int)nr_cpus >= 0);
498
499 /*
500 * We dont want to block the signals - that would cause
501 * child tasks to inherit that and Ctrl-C would not work.
502 * What we want is for Ctrl-C to work in the exec()-ed
503 * task, but being ignored by perf stat itself:
504 */
505 atexit(sig_atexit);
506 signal(SIGINT, skip_signal);
507 signal(SIGALRM, skip_signal);
508 signal(SIGABRT, skip_signal);
509
510 status = 0;
511 for (run_idx = 0; run_idx < run_count; run_idx++) {
512 if (run_count != 1 && verbose)
513 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
514 status = run_perf_stat(argc, argv);
515 }
516
517 print_stat(argc, argv);
518
519 return status;
520 }
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