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Ingo Molnarddcacfa2009-04-20 15:37:32 +02001/*
Ingo Molnarbf9e1872009-06-02 23:37:05 +02002 * 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:
Ingo Molnarddcacfa2009-04-20 15:37:32 +02008
Ingo Molnarbf9e1872009-06-02 23:37:05 +02009 $ perf stat ~/hackbench 10
10 Time: 0.104
Ingo Molnarddcacfa2009-04-20 15:37:32 +020011
Ingo Molnarbf9e1872009-06-02 23:37:05 +020012 Performance counter stats for '/home/mingo/hackbench':
Ingo Molnarddcacfa2009-04-20 15:37:32 +020013
Ingo Molnarbf9e1872009-06-02 23:37:05 +020014 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
Ingo Molnarddcacfa2009-04-20 15:37:32 +020022
Ingo Molnarbf9e1872009-06-02 23:37:05 +020023 Wall-clock time elapsed: 123.786620 msecs
Ingo Molnarddcacfa2009-04-20 15:37:32 +020024
Ingo Molnar52425192009-05-26 09:17:18 +020025 *
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>
Jaswinder Singh Rajput6e750a82009-06-27 03:02:07 +053035 * Jaswinder Singh Rajput <jaswinder@kernel.org>
Ingo Molnar52425192009-05-26 09:17:18 +020036 *
37 * Released under the GPL v2. (and only v2, not any later version)
Ingo Molnarddcacfa2009-04-20 15:37:32 +020038 */
39
Peter Zijlstra1a482f32009-05-23 18:28:58 +020040#include "perf.h"
Ingo Molnar16f762a2009-05-27 09:10:38 +020041#include "builtin.h"
Ingo Molnar148be2c2009-04-27 08:02:14 +020042#include "util/util.h"
Ingo Molnar52425192009-05-26 09:17:18 +020043#include "util/parse-options.h"
44#include "util/parse-events.h"
Ingo Molnarddcacfa2009-04-20 15:37:32 +020045
Ingo Molnarddcacfa2009-04-20 15:37:32 +020046#include <sys/prctl.h>
Ingo Molnar42202dd2009-06-13 14:57:28 +020047#include <math.h>
Peter Zijlstra16c8a102009-05-05 17:50:27 +020048
Jaswinder Singh Rajputc3043562009-06-27 23:49:09 +053049static struct perf_counter_attr default_attrs[] = {
Ingo Molnara21ca2c2009-06-06 09:58:57 +020050
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +020051 { .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 },
Ingo Molnara21ca2c2009-06-06 09:58:57 +020055
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +020056 { .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
Ingo Molnara21ca2c2009-06-06 09:58:57 +020061};
62
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053063#define MAX_RUN 100
64
Ingo Molnarddcacfa2009-04-20 15:37:32 +020065static int system_wide = 0;
Ingo Molnar743ee1f2009-06-07 17:06:46 +020066static int verbose = 0;
Ingo Molnarf37a2912009-07-01 12:37:06 +020067static unsigned int nr_cpus = 0;
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053068static int run_idx = 0;
69
70static int run_count = 1;
71static int inherit = 1;
72static int scale = 1;
73static int target_pid = -1;
Ingo Molnar0cfb7a12009-06-27 06:10:30 +020074static int null_run = 0;
Ingo Molnarddcacfa2009-04-20 15:37:32 +020075
Ingo Molnarddcacfa2009-04-20 15:37:32 +020076static int fd[MAX_NR_CPUS][MAX_COUNTERS];
77
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100078static u64 runtime_nsecs[MAX_RUN];
79static u64 walltime_nsecs[MAX_RUN];
80static u64 runtime_cycles[MAX_RUN];
Ingo Molnar42202dd2009-06-13 14:57:28 +020081
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053082static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
83static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
84
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100085static u64 event_res_avg[MAX_COUNTERS][3];
86static u64 event_res_noise[MAX_COUNTERS][3];
Ingo Molnar42202dd2009-06-13 14:57:28 +020087
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100088static u64 event_scaled_avg[MAX_COUNTERS];
Ingo Molnar42202dd2009-06-13 14:57:28 +020089
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100090static u64 runtime_nsecs_avg;
91static u64 runtime_nsecs_noise;
Ingo Molnar42202dd2009-06-13 14:57:28 +020092
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100093static u64 walltime_nsecs_avg;
94static u64 walltime_nsecs_noise;
Ingo Molnar42202dd2009-06-13 14:57:28 +020095
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100096static u64 runtime_cycles_avg;
97static u64 runtime_cycles_noise;
Ingo Molnarbe1ac0d2009-05-29 09:10:54 +020098
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +053099#define MATCH_EVENT(t, c, counter) \
100 (attrs[counter].type == PERF_TYPE_##t && \
101 attrs[counter].config == PERF_COUNT_##c)
102
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530103#define ERR_PERF_OPEN \
104"Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n"
105
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000106static void create_perf_stat_counter(int counter, int pid)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200107{
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200108 struct perf_counter_attr *attr = attrs + counter;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200109
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200110 if (scale)
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200111 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
112 PERF_FORMAT_TOTAL_TIME_RUNNING;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200113
114 if (system_wide) {
Ingo Molnarf37a2912009-07-01 12:37:06 +0200115 unsigned int cpu;
116
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530117 for (cpu = 0; cpu < nr_cpus; cpu++) {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200118 fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530119 if (fd[cpu][counter] < 0 && verbose)
120 fprintf(stderr, ERR_PERF_OPEN, counter,
121 fd[cpu][counter], strerror(errno));
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200122 }
123 } else {
Paul Mackerras57e79862009-06-30 16:07:19 +1000124 attr->inherit = inherit;
125 attr->disabled = 1;
126 attr->enable_on_exec = 1;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200127
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000128 fd[0][counter] = sys_perf_counter_open(attr, pid, -1, -1, 0);
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530129 if (fd[0][counter] < 0 && verbose)
130 fprintf(stderr, ERR_PERF_OPEN, counter,
131 fd[0][counter], strerror(errno));
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200132 }
133}
134
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200135/*
136 * Does the counter have nsecs as a unit?
137 */
138static inline int nsec_counter(int counter)
139{
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530140 if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
141 MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200142 return 1;
143
144 return 0;
145}
146
147/*
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200148 * Read out the results of a single counter:
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200149 */
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200150static void read_counter(int counter)
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200151{
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000152 u64 *count, single_count[3];
Ingo Molnarf37a2912009-07-01 12:37:06 +0200153 unsigned int cpu;
154 size_t res, nv;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200155 int scaled;
156
Ingo Molnar42202dd2009-06-13 14:57:28 +0200157 count = event_res[run_idx][counter];
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200158
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200159 count[0] = count[1] = count[2] = 0;
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200160
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200161 nv = scale ? 3 : 1;
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530162 for (cpu = 0; cpu < nr_cpus; cpu++) {
Ingo Molnar743ee1f2009-06-07 17:06:46 +0200163 if (fd[cpu][counter] < 0)
164 continue;
165
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000166 res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
167 assert(res == nv * sizeof(u64));
Ingo Molnarf37a2912009-07-01 12:37:06 +0200168
Ingo Molnar42202dd2009-06-13 14:57:28 +0200169 close(fd[cpu][counter]);
170 fd[cpu][counter] = -1;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200171
172 count[0] += single_count[0];
173 if (scale) {
174 count[1] += single_count[1];
175 count[2] += single_count[2];
176 }
177 }
178
179 scaled = 0;
180 if (scale) {
181 if (count[2] == 0) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200182 event_scaled[run_idx][counter] = -1;
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200183 count[0] = 0;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200184 return;
185 }
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200186
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200187 if (count[2] < count[1]) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200188 event_scaled[run_idx][counter] = 1;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200189 count[0] = (unsigned long long)
190 ((double)count[0] * count[1] / count[2] + 0.5);
191 }
192 }
Ingo Molnarbe1ac0d2009-05-29 09:10:54 +0200193 /*
194 * Save the full runtime - to allow normalization during printout:
195 */
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530196 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
Ingo Molnar42202dd2009-06-13 14:57:28 +0200197 runtime_nsecs[run_idx] = count[0];
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530198 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
Ingo Molnar42202dd2009-06-13 14:57:28 +0200199 runtime_cycles[run_idx] = count[0];
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200200}
201
Ingo Molnarf37a2912009-07-01 12:37:06 +0200202static int run_perf_stat(int argc __used, const char **argv)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200203{
204 unsigned long long t0, t1;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200205 int status = 0;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200206 int counter;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200207 int pid;
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000208 int child_ready_pipe[2], go_pipe[2];
209 char buf;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200210
211 if (!system_wide)
212 nr_cpus = 1;
213
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000214 if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
215 perror("failed to create pipes");
216 exit(1);
217 }
218
219 if ((pid = fork()) < 0)
220 perror("failed to fork");
221
222 if (!pid) {
223 close(child_ready_pipe[0]);
224 close(go_pipe[1]);
225 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
226
227 /*
228 * Do a dummy execvp to get the PLT entry resolved,
229 * so we avoid the resolver overhead on the real
230 * execvp call.
231 */
232 execvp("", (char **)argv);
233
234 /*
235 * Tell the parent we're ready to go
236 */
237 close(child_ready_pipe[1]);
238
239 /*
240 * Wait until the parent tells us to go.
241 */
Frederic Weisbeckera92bef02009-07-01 21:02:10 +0200242 if (read(go_pipe[0], &buf, 1) == -1)
243 perror("unable to read pipe");
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000244
245 execvp(argv[0], (char **)argv);
246
247 perror(argv[0]);
248 exit(-1);
249 }
250
251 /*
252 * Wait for the child to be ready to exec.
253 */
254 close(child_ready_pipe[1]);
255 close(go_pipe[0]);
Frederic Weisbeckera92bef02009-07-01 21:02:10 +0200256 if (read(child_ready_pipe[0], &buf, 1) == -1)
257 perror("unable to read pipe");
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000258 close(child_ready_pipe[0]);
259
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200260 for (counter = 0; counter < nr_counters; counter++)
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000261 create_perf_stat_counter(counter, pid);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200262
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200263 /*
264 * Enable counters and exec the command:
265 */
266 t0 = rdclock();
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200267
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000268 close(go_pipe[1]);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200269 wait(&status);
Ingo Molnar44db76c2009-06-03 19:36:07 +0200270
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200271 t1 = rdclock();
272
Ingo Molnar42202dd2009-06-13 14:57:28 +0200273 walltime_nsecs[run_idx] = t1 - t0;
274
275 for (counter = 0; counter < nr_counters; counter++)
276 read_counter(counter);
277
278 return WEXITSTATUS(status);
279}
280
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000281static void print_noise(u64 *count, u64 *noise)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200282{
283 if (run_count > 1)
284 fprintf(stderr, " ( +- %7.3f%% )",
285 (double)noise[0]/(count[0]+1)*100.0);
286}
287
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000288static void nsec_printout(int counter, u64 *count, u64 *noise)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200289{
290 double msecs = (double)count[0] / 1000000;
291
Jaswinder Singh Rajput6e750a82009-06-27 03:02:07 +0530292 fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200293
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530294 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200295 if (walltime_nsecs_avg)
296 fprintf(stderr, " # %10.3f CPUs ",
297 (double)count[0] / (double)walltime_nsecs_avg);
298 }
299 print_noise(count, noise);
300}
301
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000302static void abs_printout(int counter, u64 *count, u64 *noise)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200303{
Jaswinder Singh Rajput6e750a82009-06-27 03:02:07 +0530304 fprintf(stderr, " %14Ld %-24s", count[0], event_name(counter));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200305
306 if (runtime_cycles_avg &&
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530307 MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200308 fprintf(stderr, " # %10.3f IPC ",
309 (double)count[0] / (double)runtime_cycles_avg);
310 } else {
311 if (runtime_nsecs_avg) {
312 fprintf(stderr, " # %10.3f M/sec",
313 (double)count[0]/runtime_nsecs_avg*1000.0);
314 }
315 }
316 print_noise(count, noise);
317}
318
319/*
320 * Print out the results of a single counter:
321 */
322static void print_counter(int counter)
323{
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000324 u64 *count, *noise;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200325 int scaled;
326
327 count = event_res_avg[counter];
328 noise = event_res_noise[counter];
329 scaled = event_scaled_avg[counter];
330
331 if (scaled == -1) {
Jaswinder Singh Rajput6e750a82009-06-27 03:02:07 +0530332 fprintf(stderr, " %14s %-24s\n",
Ingo Molnar42202dd2009-06-13 14:57:28 +0200333 "<not counted>", event_name(counter));
334 return;
335 }
336
337 if (nsec_counter(counter))
338 nsec_printout(counter, count, noise);
339 else
340 abs_printout(counter, count, noise);
341
342 if (scaled)
Ingo Molnar210ad392009-06-29 21:50:54 +0200343 fprintf(stderr, " (scaled from %.2f%%)",
344 (double) count[2] / count[1] * 100);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200345
346 fprintf(stderr, "\n");
347}
348
349/*
Ingo Molnaref281a12009-06-13 15:40:35 +0200350 * normalize_noise noise values down to stddev:
Ingo Molnar42202dd2009-06-13 14:57:28 +0200351 */
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000352static void normalize_noise(u64 *val)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200353{
354 double res;
355
356 res = (double)*val / (run_count * sqrt((double)run_count));
357
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000358 *val = (u64)res;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200359}
360
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000361static void update_avg(const char *name, int idx, u64 *avg, u64 *val)
Ingo Molnaref281a12009-06-13 15:40:35 +0200362{
363 *avg += *val;
364
365 if (verbose > 1)
366 fprintf(stderr, "debug: %20s[%d]: %Ld\n", name, idx, *val);
367}
Ingo Molnar42202dd2009-06-13 14:57:28 +0200368/*
369 * Calculate the averages and noises:
370 */
371static void calc_avg(void)
372{
373 int i, j;
374
Ingo Molnaref281a12009-06-13 15:40:35 +0200375 if (verbose > 1)
376 fprintf(stderr, "\n");
377
Ingo Molnar42202dd2009-06-13 14:57:28 +0200378 for (i = 0; i < run_count; i++) {
Ingo Molnaref281a12009-06-13 15:40:35 +0200379 update_avg("runtime", 0, &runtime_nsecs_avg, runtime_nsecs + i);
380 update_avg("walltime", 0, &walltime_nsecs_avg, walltime_nsecs + i);
381 update_avg("runtime_cycles", 0, &runtime_cycles_avg, runtime_cycles + i);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200382
383 for (j = 0; j < nr_counters; j++) {
Ingo Molnaref281a12009-06-13 15:40:35 +0200384 update_avg("counter/0", j,
385 event_res_avg[j]+0, event_res[i][j]+0);
386 update_avg("counter/1", j,
387 event_res_avg[j]+1, event_res[i][j]+1);
388 update_avg("counter/2", j,
389 event_res_avg[j]+2, event_res[i][j]+2);
Ingo Molnarf37a2912009-07-01 12:37:06 +0200390 if (event_scaled[i][j] != (u64)-1)
Ingo Molnar566747e2009-06-27 06:24:32 +0200391 update_avg("scaled", j,
392 event_scaled_avg + j, event_scaled[i]+j);
393 else
394 event_scaled_avg[j] = -1;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200395 }
396 }
397 runtime_nsecs_avg /= run_count;
398 walltime_nsecs_avg /= run_count;
399 runtime_cycles_avg /= run_count;
400
401 for (j = 0; j < nr_counters; j++) {
402 event_res_avg[j][0] /= run_count;
403 event_res_avg[j][1] /= run_count;
404 event_res_avg[j][2] /= run_count;
405 }
406
407 for (i = 0; i < run_count; i++) {
408 runtime_nsecs_noise +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000409 abs((s64)(runtime_nsecs[i] - runtime_nsecs_avg));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200410 walltime_nsecs_noise +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000411 abs((s64)(walltime_nsecs[i] - walltime_nsecs_avg));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200412 runtime_cycles_noise +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000413 abs((s64)(runtime_cycles[i] - runtime_cycles_avg));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200414
415 for (j = 0; j < nr_counters; j++) {
416 event_res_noise[j][0] +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000417 abs((s64)(event_res[i][j][0] - event_res_avg[j][0]));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200418 event_res_noise[j][1] +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000419 abs((s64)(event_res[i][j][1] - event_res_avg[j][1]));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200420 event_res_noise[j][2] +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000421 abs((s64)(event_res[i][j][2] - event_res_avg[j][2]));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200422 }
423 }
424
Ingo Molnaref281a12009-06-13 15:40:35 +0200425 normalize_noise(&runtime_nsecs_noise);
426 normalize_noise(&walltime_nsecs_noise);
427 normalize_noise(&runtime_cycles_noise);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200428
429 for (j = 0; j < nr_counters; j++) {
Ingo Molnaref281a12009-06-13 15:40:35 +0200430 normalize_noise(&event_res_noise[j][0]);
431 normalize_noise(&event_res_noise[j][1]);
432 normalize_noise(&event_res_noise[j][2]);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200433 }
434}
435
436static void print_stat(int argc, const char **argv)
437{
438 int i, counter;
439
440 calc_avg();
441
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200442 fflush(stdout);
443
444 fprintf(stderr, "\n");
Ingo Molnar44db76c2009-06-03 19:36:07 +0200445 fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
446
447 for (i = 1; i < argc; i++)
448 fprintf(stderr, " %s", argv[i]);
449
Ingo Molnar42202dd2009-06-13 14:57:28 +0200450 fprintf(stderr, "\'");
451 if (run_count > 1)
452 fprintf(stderr, " (%d runs)", run_count);
453 fprintf(stderr, ":\n\n");
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200454
455 for (counter = 0; counter < nr_counters; counter++)
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200456 print_counter(counter);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200457
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200458 fprintf(stderr, "\n");
Ingo Molnar566747e2009-06-27 06:24:32 +0200459 fprintf(stderr, " %14.9f seconds time elapsed",
Ingo Molnar42202dd2009-06-13 14:57:28 +0200460 (double)walltime_nsecs_avg/1e9);
Ingo Molnar566747e2009-06-27 06:24:32 +0200461 if (run_count > 1) {
462 fprintf(stderr, " ( +- %7.3f%% )",
463 100.0*(double)walltime_nsecs_noise/(double)walltime_nsecs_avg);
464 }
465 fprintf(stderr, "\n\n");
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200466}
467
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200468static volatile int signr = -1;
469
Ingo Molnar52425192009-05-26 09:17:18 +0200470static void skip_signal(int signo)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200471{
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200472 signr = signo;
473}
474
475static void sig_atexit(void)
476{
477 if (signr == -1)
478 return;
479
480 signal(signr, SIG_DFL);
481 kill(getpid(), signr);
Ingo Molnar52425192009-05-26 09:17:18 +0200482}
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200483
Ingo Molnar52425192009-05-26 09:17:18 +0200484static const char * const stat_usage[] = {
485 "perf stat [<options>] <command>",
486 NULL
487};
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200488
Ingo Molnar52425192009-05-26 09:17:18 +0200489static const struct option options[] = {
490 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200491 "event selector. use 'perf list' to list available events",
492 parse_events),
Ingo Molnar52425192009-05-26 09:17:18 +0200493 OPT_BOOLEAN('i', "inherit", &inherit,
494 "child tasks inherit counters"),
495 OPT_INTEGER('p', "pid", &target_pid,
496 "stat events on existing pid"),
497 OPT_BOOLEAN('a', "all-cpus", &system_wide,
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530498 "system-wide collection from all CPUs"),
Thomas Gleixner86847b62009-06-06 12:24:17 +0200499 OPT_BOOLEAN('S', "scale", &scale,
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530500 "scale/normalize counters"),
Ingo Molnar743ee1f2009-06-07 17:06:46 +0200501 OPT_BOOLEAN('v', "verbose", &verbose,
502 "be more verbose (show counter open errors, etc)"),
Ingo Molnar42202dd2009-06-13 14:57:28 +0200503 OPT_INTEGER('r', "repeat", &run_count,
504 "repeat command and print average + stddev (max: 100)"),
Ingo Molnar0cfb7a12009-06-27 06:10:30 +0200505 OPT_BOOLEAN('n', "null", &null_run,
506 "null run - dont start any counters"),
Ingo Molnar52425192009-05-26 09:17:18 +0200507 OPT_END()
508};
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200509
Ingo Molnarf37a2912009-07-01 12:37:06 +0200510int cmd_stat(int argc, const char **argv, const char *prefix __used)
Ingo Molnar52425192009-05-26 09:17:18 +0200511{
Ingo Molnar42202dd2009-06-13 14:57:28 +0200512 int status;
513
Anton Blancharda0541232009-07-22 23:04:12 +1000514 argc = parse_options(argc, argv, options, stat_usage,
515 PARSE_OPT_STOP_AT_NON_OPTION);
Ingo Molnar52425192009-05-26 09:17:18 +0200516 if (!argc)
517 usage_with_options(stat_usage, options);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200518 if (run_count <= 0 || run_count > MAX_RUN)
519 usage_with_options(stat_usage, options);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200520
Jaswinder Singh Rajputc3043562009-06-27 23:49:09 +0530521 /* Set attrs and nr_counters if no event is selected and !null_run */
522 if (!null_run && !nr_counters) {
523 memcpy(attrs, default_attrs, sizeof(default_attrs));
524 nr_counters = ARRAY_SIZE(default_attrs);
525 }
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200526
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200527 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
528 assert(nr_cpus <= MAX_NR_CPUS);
Ingo Molnarf37a2912009-07-01 12:37:06 +0200529 assert((int)nr_cpus >= 0);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200530
Ingo Molnar58d7e992009-05-15 11:03:23 +0200531 /*
532 * We dont want to block the signals - that would cause
533 * child tasks to inherit that and Ctrl-C would not work.
534 * What we want is for Ctrl-C to work in the exec()-ed
535 * task, but being ignored by perf stat itself:
536 */
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200537 atexit(sig_atexit);
Ingo Molnar58d7e992009-05-15 11:03:23 +0200538 signal(SIGINT, skip_signal);
539 signal(SIGALRM, skip_signal);
540 signal(SIGABRT, skip_signal);
541
Ingo Molnar42202dd2009-06-13 14:57:28 +0200542 status = 0;
543 for (run_idx = 0; run_idx < run_count; run_idx++) {
544 if (run_count != 1 && verbose)
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530545 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200546 status = run_perf_stat(argc, argv);
547 }
548
549 print_stat(argc, argv);
550
551 return status;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200552}