blob: 1a26262306604e07f366c89c27cb63c83ccf3d71 [file] [log] [blame]
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 Rajput6e750a8f2009-06-27 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"
Frederic Weisbecker8f28827a2009-08-16 22:05:48 +020045#include "util/event.h"
46#include "util/debug.h"
Ingo Molnarddcacfa2009-04-20 15:37:32 +020047
Ingo Molnarddcacfa2009-04-20 15:37:32 +020048#include <sys/prctl.h>
Ingo Molnar42202dd2009-06-13 14:57:28 +020049#include <math.h>
Peter Zijlstra16c8a102009-05-05 17:50:27 +020050
Jaswinder Singh Rajputc3043562009-06-27 23:49:09 +053051static struct perf_counter_attr default_attrs[] = {
Ingo Molnara21ca2c2009-06-06 09:58:57 +020052
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +020053 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },
54 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES},
55 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },
56 { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },
Ingo Molnara21ca2c2009-06-06 09:58:57 +020057
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +020058 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
59 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
60 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES},
61 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
62
Ingo Molnara21ca2c2009-06-06 09:58:57 +020063};
64
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053065#define MAX_RUN 100
66
Ingo Molnarddcacfa2009-04-20 15:37:32 +020067static int system_wide = 0;
Ingo Molnarf37a2912009-07-01 12:37:06 +020068static unsigned int nr_cpus = 0;
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053069static int run_idx = 0;
70
71static int run_count = 1;
72static int inherit = 1;
73static int scale = 1;
74static int target_pid = -1;
Ingo Molnar0cfb7a12009-06-27 06:10:30 +020075static int null_run = 0;
Ingo Molnarddcacfa2009-04-20 15:37:32 +020076
Ingo Molnarddcacfa2009-04-20 15:37:32 +020077static int fd[MAX_NR_CPUS][MAX_COUNTERS];
78
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100079static u64 runtime_nsecs[MAX_RUN];
80static u64 walltime_nsecs[MAX_RUN];
81static u64 runtime_cycles[MAX_RUN];
Ingo Molnar42202dd2009-06-13 14:57:28 +020082
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053083static u64 event_res[MAX_RUN][MAX_COUNTERS][3];
84static u64 event_scaled[MAX_RUN][MAX_COUNTERS];
85
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100086static u64 event_res_avg[MAX_COUNTERS][3];
87static u64 event_res_noise[MAX_COUNTERS][3];
Ingo Molnar42202dd2009-06-13 14:57:28 +020088
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100089static u64 event_scaled_avg[MAX_COUNTERS];
Ingo Molnar42202dd2009-06-13 14:57:28 +020090
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100091static u64 runtime_nsecs_avg;
92static u64 runtime_nsecs_noise;
Ingo Molnar42202dd2009-06-13 14:57:28 +020093
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100094static u64 walltime_nsecs_avg;
95static u64 walltime_nsecs_noise;
Ingo Molnar42202dd2009-06-13 14:57:28 +020096
Paul Mackerras9cffa8d2009-06-19 22:21:42 +100097static u64 runtime_cycles_avg;
98static u64 runtime_cycles_noise;
Ingo Molnarbe1ac0d2009-05-29 09:10:54 +020099
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530100#define MATCH_EVENT(t, c, counter) \
101 (attrs[counter].type == PERF_TYPE_##t && \
102 attrs[counter].config == PERF_COUNT_##c)
103
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530104#define ERR_PERF_OPEN \
105"Error: counter %d, sys_perf_counter_open() syscall returned with %d (%s)\n"
106
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000107static void create_perf_stat_counter(int counter, int pid)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200108{
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200109 struct perf_counter_attr *attr = attrs + counter;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200110
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200111 if (scale)
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200112 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
113 PERF_FORMAT_TOTAL_TIME_RUNNING;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200114
115 if (system_wide) {
Ingo Molnarf37a2912009-07-01 12:37:06 +0200116 unsigned int cpu;
117
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530118 for (cpu = 0; cpu < nr_cpus; cpu++) {
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200119 fd[cpu][counter] = sys_perf_counter_open(attr, -1, cpu, -1, 0);
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530120 if (fd[cpu][counter] < 0 && verbose)
121 fprintf(stderr, ERR_PERF_OPEN, counter,
122 fd[cpu][counter], strerror(errno));
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200123 }
124 } else {
Paul Mackerras57e79862009-06-30 16:07:19 +1000125 attr->inherit = inherit;
126 attr->disabled = 1;
127 attr->enable_on_exec = 1;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200128
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000129 fd[0][counter] = sys_perf_counter_open(attr, pid, -1, -1, 0);
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530130 if (fd[0][counter] < 0 && verbose)
131 fprintf(stderr, ERR_PERF_OPEN, counter,
132 fd[0][counter], strerror(errno));
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200133 }
134}
135
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200136/*
137 * Does the counter have nsecs as a unit?
138 */
139static inline int nsec_counter(int counter)
140{
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530141 if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
142 MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200143 return 1;
144
145 return 0;
146}
147
148/*
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200149 * Read out the results of a single counter:
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200150 */
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200151static void read_counter(int counter)
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200152{
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000153 u64 *count, single_count[3];
Ingo Molnarf37a2912009-07-01 12:37:06 +0200154 unsigned int cpu;
155 size_t res, nv;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200156 int scaled;
157
Ingo Molnar42202dd2009-06-13 14:57:28 +0200158 count = event_res[run_idx][counter];
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200159
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200160 count[0] = count[1] = count[2] = 0;
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200161
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200162 nv = scale ? 3 : 1;
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530163 for (cpu = 0; cpu < nr_cpus; cpu++) {
Ingo Molnar743ee1f2009-06-07 17:06:46 +0200164 if (fd[cpu][counter] < 0)
165 continue;
166
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000167 res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
168 assert(res == nv * sizeof(u64));
Ingo Molnarf37a2912009-07-01 12:37:06 +0200169
Ingo Molnar42202dd2009-06-13 14:57:28 +0200170 close(fd[cpu][counter]);
171 fd[cpu][counter] = -1;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200172
173 count[0] += single_count[0];
174 if (scale) {
175 count[1] += single_count[1];
176 count[2] += single_count[2];
177 }
178 }
179
180 scaled = 0;
181 if (scale) {
182 if (count[2] == 0) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200183 event_scaled[run_idx][counter] = -1;
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200184 count[0] = 0;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200185 return;
186 }
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200187
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200188 if (count[2] < count[1]) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200189 event_scaled[run_idx][counter] = 1;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200190 count[0] = (unsigned long long)
191 ((double)count[0] * count[1] / count[2] + 0.5);
192 }
193 }
Ingo Molnarbe1ac0d2009-05-29 09:10:54 +0200194 /*
195 * Save the full runtime - to allow normalization during printout:
196 */
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530197 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
Ingo Molnar42202dd2009-06-13 14:57:28 +0200198 runtime_nsecs[run_idx] = count[0];
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530199 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
Ingo Molnar42202dd2009-06-13 14:57:28 +0200200 runtime_cycles[run_idx] = count[0];
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200201}
202
Ingo Molnarf37a2912009-07-01 12:37:06 +0200203static int run_perf_stat(int argc __used, const char **argv)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200204{
205 unsigned long long t0, t1;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200206 int status = 0;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200207 int counter;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200208 int pid;
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000209 int child_ready_pipe[2], go_pipe[2];
210 char buf;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200211
212 if (!system_wide)
213 nr_cpus = 1;
214
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000215 if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
216 perror("failed to create pipes");
217 exit(1);
218 }
219
220 if ((pid = fork()) < 0)
221 perror("failed to fork");
222
223 if (!pid) {
224 close(child_ready_pipe[0]);
225 close(go_pipe[1]);
226 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
227
228 /*
229 * Do a dummy execvp to get the PLT entry resolved,
230 * so we avoid the resolver overhead on the real
231 * execvp call.
232 */
233 execvp("", (char **)argv);
234
235 /*
236 * Tell the parent we're ready to go
237 */
238 close(child_ready_pipe[1]);
239
240 /*
241 * Wait until the parent tells us to go.
242 */
Frederic Weisbeckera92bef02009-07-01 21:02:10 +0200243 if (read(go_pipe[0], &buf, 1) == -1)
244 perror("unable to read pipe");
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000245
246 execvp(argv[0], (char **)argv);
247
248 perror(argv[0]);
249 exit(-1);
250 }
251
252 /*
253 * Wait for the child to be ready to exec.
254 */
255 close(child_ready_pipe[1]);
256 close(go_pipe[0]);
Frederic Weisbeckera92bef02009-07-01 21:02:10 +0200257 if (read(child_ready_pipe[0], &buf, 1) == -1)
258 perror("unable to read pipe");
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000259 close(child_ready_pipe[0]);
260
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200261 for (counter = 0; counter < nr_counters; counter++)
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000262 create_perf_stat_counter(counter, pid);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200263
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200264 /*
265 * Enable counters and exec the command:
266 */
267 t0 = rdclock();
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200268
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000269 close(go_pipe[1]);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200270 wait(&status);
Ingo Molnar44db76c2009-06-03 19:36:07 +0200271
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200272 t1 = rdclock();
273
Ingo Molnar42202dd2009-06-13 14:57:28 +0200274 walltime_nsecs[run_idx] = t1 - t0;
275
276 for (counter = 0; counter < nr_counters; counter++)
277 read_counter(counter);
278
279 return WEXITSTATUS(status);
280}
281
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000282static void print_noise(u64 *count, u64 *noise)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200283{
284 if (run_count > 1)
285 fprintf(stderr, " ( +- %7.3f%% )",
286 (double)noise[0]/(count[0]+1)*100.0);
287}
288
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000289static void nsec_printout(int counter, u64 *count, u64 *noise)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200290{
291 double msecs = (double)count[0] / 1000000;
292
Jaswinder Singh Rajput6e750a8f2009-06-27 03:02:07 +0530293 fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200294
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530295 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200296 if (walltime_nsecs_avg)
297 fprintf(stderr, " # %10.3f CPUs ",
298 (double)count[0] / (double)walltime_nsecs_avg);
299 }
300 print_noise(count, noise);
301}
302
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000303static void abs_printout(int counter, u64 *count, u64 *noise)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200304{
Jaswinder Singh Rajput6e750a8f2009-06-27 03:02:07 +0530305 fprintf(stderr, " %14Ld %-24s", count[0], event_name(counter));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200306
307 if (runtime_cycles_avg &&
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530308 MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
Ingo Molnar42202dd2009-06-13 14:57:28 +0200309 fprintf(stderr, " # %10.3f IPC ",
310 (double)count[0] / (double)runtime_cycles_avg);
311 } else {
312 if (runtime_nsecs_avg) {
313 fprintf(stderr, " # %10.3f M/sec",
314 (double)count[0]/runtime_nsecs_avg*1000.0);
315 }
316 }
317 print_noise(count, noise);
318}
319
320/*
321 * Print out the results of a single counter:
322 */
323static void print_counter(int counter)
324{
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000325 u64 *count, *noise;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200326 int scaled;
327
328 count = event_res_avg[counter];
329 noise = event_res_noise[counter];
330 scaled = event_scaled_avg[counter];
331
332 if (scaled == -1) {
Jaswinder Singh Rajput6e750a8f2009-06-27 03:02:07 +0530333 fprintf(stderr, " %14s %-24s\n",
Ingo Molnar42202dd2009-06-13 14:57:28 +0200334 "<not counted>", event_name(counter));
335 return;
336 }
337
338 if (nsec_counter(counter))
339 nsec_printout(counter, count, noise);
340 else
341 abs_printout(counter, count, noise);
342
343 if (scaled)
Ingo Molnar210ad392009-06-29 21:50:54 +0200344 fprintf(stderr, " (scaled from %.2f%%)",
345 (double) count[2] / count[1] * 100);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200346
347 fprintf(stderr, "\n");
348}
349
350/*
Ingo Molnaref281a12009-06-13 15:40:35 +0200351 * normalize_noise noise values down to stddev:
Ingo Molnar42202dd2009-06-13 14:57:28 +0200352 */
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000353static void normalize_noise(u64 *val)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200354{
355 double res;
356
357 res = (double)*val / (run_count * sqrt((double)run_count));
358
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000359 *val = (u64)res;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200360}
361
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000362static void update_avg(const char *name, int idx, u64 *avg, u64 *val)
Ingo Molnaref281a12009-06-13 15:40:35 +0200363{
364 *avg += *val;
365
366 if (verbose > 1)
367 fprintf(stderr, "debug: %20s[%d]: %Ld\n", name, idx, *val);
368}
Ingo Molnar42202dd2009-06-13 14:57:28 +0200369/*
370 * Calculate the averages and noises:
371 */
372static void calc_avg(void)
373{
374 int i, j;
375
Ingo Molnaref281a12009-06-13 15:40:35 +0200376 if (verbose > 1)
377 fprintf(stderr, "\n");
378
Ingo Molnar42202dd2009-06-13 14:57:28 +0200379 for (i = 0; i < run_count; i++) {
Ingo Molnaref281a12009-06-13 15:40:35 +0200380 update_avg("runtime", 0, &runtime_nsecs_avg, runtime_nsecs + i);
381 update_avg("walltime", 0, &walltime_nsecs_avg, walltime_nsecs + i);
382 update_avg("runtime_cycles", 0, &runtime_cycles_avg, runtime_cycles + i);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200383
384 for (j = 0; j < nr_counters; j++) {
Ingo Molnaref281a12009-06-13 15:40:35 +0200385 update_avg("counter/0", j,
386 event_res_avg[j]+0, event_res[i][j]+0);
387 update_avg("counter/1", j,
388 event_res_avg[j]+1, event_res[i][j]+1);
389 update_avg("counter/2", j,
390 event_res_avg[j]+2, event_res[i][j]+2);
Ingo Molnarf37a2912009-07-01 12:37:06 +0200391 if (event_scaled[i][j] != (u64)-1)
Ingo Molnar566747e2009-06-27 06:24:32 +0200392 update_avg("scaled", j,
393 event_scaled_avg + j, event_scaled[i]+j);
394 else
395 event_scaled_avg[j] = -1;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200396 }
397 }
398 runtime_nsecs_avg /= run_count;
399 walltime_nsecs_avg /= run_count;
400 runtime_cycles_avg /= run_count;
401
402 for (j = 0; j < nr_counters; j++) {
403 event_res_avg[j][0] /= run_count;
404 event_res_avg[j][1] /= run_count;
405 event_res_avg[j][2] /= run_count;
406 }
407
408 for (i = 0; i < run_count; i++) {
409 runtime_nsecs_noise +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000410 abs((s64)(runtime_nsecs[i] - runtime_nsecs_avg));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200411 walltime_nsecs_noise +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000412 abs((s64)(walltime_nsecs[i] - walltime_nsecs_avg));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200413 runtime_cycles_noise +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000414 abs((s64)(runtime_cycles[i] - runtime_cycles_avg));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200415
416 for (j = 0; j < nr_counters; j++) {
417 event_res_noise[j][0] +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000418 abs((s64)(event_res[i][j][0] - event_res_avg[j][0]));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200419 event_res_noise[j][1] +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000420 abs((s64)(event_res[i][j][1] - event_res_avg[j][1]));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200421 event_res_noise[j][2] +=
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000422 abs((s64)(event_res[i][j][2] - event_res_avg[j][2]));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200423 }
424 }
425
Ingo Molnaref281a12009-06-13 15:40:35 +0200426 normalize_noise(&runtime_nsecs_noise);
427 normalize_noise(&walltime_nsecs_noise);
428 normalize_noise(&runtime_cycles_noise);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200429
430 for (j = 0; j < nr_counters; j++) {
Ingo Molnaref281a12009-06-13 15:40:35 +0200431 normalize_noise(&event_res_noise[j][0]);
432 normalize_noise(&event_res_noise[j][1]);
433 normalize_noise(&event_res_noise[j][2]);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200434 }
435}
436
437static void print_stat(int argc, const char **argv)
438{
439 int i, counter;
440
441 calc_avg();
442
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200443 fflush(stdout);
444
445 fprintf(stderr, "\n");
Ingo Molnar44db76c2009-06-03 19:36:07 +0200446 fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
447
448 for (i = 1; i < argc; i++)
449 fprintf(stderr, " %s", argv[i]);
450
Ingo Molnar42202dd2009-06-13 14:57:28 +0200451 fprintf(stderr, "\'");
452 if (run_count > 1)
453 fprintf(stderr, " (%d runs)", run_count);
454 fprintf(stderr, ":\n\n");
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200455
456 for (counter = 0; counter < nr_counters; counter++)
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200457 print_counter(counter);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200458
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200459 fprintf(stderr, "\n");
Ingo Molnar566747e2009-06-27 06:24:32 +0200460 fprintf(stderr, " %14.9f seconds time elapsed",
Ingo Molnar42202dd2009-06-13 14:57:28 +0200461 (double)walltime_nsecs_avg/1e9);
Ingo Molnar566747e2009-06-27 06:24:32 +0200462 if (run_count > 1) {
463 fprintf(stderr, " ( +- %7.3f%% )",
464 100.0*(double)walltime_nsecs_noise/(double)walltime_nsecs_avg);
465 }
466 fprintf(stderr, "\n\n");
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200467}
468
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200469static volatile int signr = -1;
470
Ingo Molnar52425192009-05-26 09:17:18 +0200471static void skip_signal(int signo)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200472{
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200473 signr = signo;
474}
475
476static void sig_atexit(void)
477{
478 if (signr == -1)
479 return;
480
481 signal(signr, SIG_DFL);
482 kill(getpid(), signr);
Ingo Molnar52425192009-05-26 09:17:18 +0200483}
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200484
Ingo Molnar52425192009-05-26 09:17:18 +0200485static const char * const stat_usage[] = {
486 "perf stat [<options>] <command>",
487 NULL
488};
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200489
Ingo Molnar52425192009-05-26 09:17:18 +0200490static const struct option options[] = {
491 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200492 "event selector. use 'perf list' to list available events",
493 parse_events),
Ingo Molnar52425192009-05-26 09:17:18 +0200494 OPT_BOOLEAN('i', "inherit", &inherit,
495 "child tasks inherit counters"),
496 OPT_INTEGER('p', "pid", &target_pid,
497 "stat events on existing pid"),
498 OPT_BOOLEAN('a', "all-cpus", &system_wide,
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530499 "system-wide collection from all CPUs"),
Brice Goglinb26bc5a2009-08-07 10:18:39 +0200500 OPT_BOOLEAN('c', "scale", &scale,
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530501 "scale/normalize counters"),
Ingo Molnar743ee1f2009-06-07 17:06:46 +0200502 OPT_BOOLEAN('v', "verbose", &verbose,
503 "be more verbose (show counter open errors, etc)"),
Ingo Molnar42202dd2009-06-13 14:57:28 +0200504 OPT_INTEGER('r', "repeat", &run_count,
505 "repeat command and print average + stddev (max: 100)"),
Ingo Molnar0cfb7a12009-06-27 06:10:30 +0200506 OPT_BOOLEAN('n', "null", &null_run,
507 "null run - dont start any counters"),
Ingo Molnar52425192009-05-26 09:17:18 +0200508 OPT_END()
509};
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200510
Ingo Molnarf37a2912009-07-01 12:37:06 +0200511int cmd_stat(int argc, const char **argv, const char *prefix __used)
Ingo Molnar52425192009-05-26 09:17:18 +0200512{
Ingo Molnar42202dd2009-06-13 14:57:28 +0200513 int status;
514
Anton Blancharda0541232009-07-22 23:04:12 +1000515 argc = parse_options(argc, argv, options, stat_usage,
516 PARSE_OPT_STOP_AT_NON_OPTION);
Ingo Molnar52425192009-05-26 09:17:18 +0200517 if (!argc)
518 usage_with_options(stat_usage, options);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200519 if (run_count <= 0 || run_count > MAX_RUN)
520 usage_with_options(stat_usage, options);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200521
Jaswinder Singh Rajputc3043562009-06-27 23:49:09 +0530522 /* Set attrs and nr_counters if no event is selected and !null_run */
523 if (!null_run && !nr_counters) {
524 memcpy(attrs, default_attrs, sizeof(default_attrs));
525 nr_counters = ARRAY_SIZE(default_attrs);
526 }
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200527
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200528 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
529 assert(nr_cpus <= MAX_NR_CPUS);
Ingo Molnarf37a2912009-07-01 12:37:06 +0200530 assert((int)nr_cpus >= 0);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200531
Ingo Molnar58d7e992009-05-15 11:03:23 +0200532 /*
533 * We dont want to block the signals - that would cause
534 * child tasks to inherit that and Ctrl-C would not work.
535 * What we want is for Ctrl-C to work in the exec()-ed
536 * task, but being ignored by perf stat itself:
537 */
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200538 atexit(sig_atexit);
Ingo Molnar58d7e992009-05-15 11:03:23 +0200539 signal(SIGINT, skip_signal);
540 signal(SIGALRM, skip_signal);
541 signal(SIGABRT, skip_signal);
542
Ingo Molnar42202dd2009-06-13 14:57:28 +0200543 status = 0;
544 for (run_idx = 0; run_idx < run_count; run_idx++) {
545 if (run_count != 1 && verbose)
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530546 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200547 status = run_perf_stat(argc, argv);
548 }
549
550 print_stat(argc, argv);
551
552 return status;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200553}