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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 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
Ingo Molnarcdd6c482009-09-21 12:02:48 +020051static struct perf_event_attr default_attrs[] = {
Ingo Molnara21ca2c2009-06-06 09:58:57 +020052
Ingo Molnar56aab462009-10-19 13:27:08 +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
Ingo Molnar56aab462009-10-19 13:27:08 +020058 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },
59 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },
Ingo Molnar56aab462009-10-19 13:27:08 +020060 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },
61 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },
Ingo Molnardd86e722009-10-19 13:33:03 +020062 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_REFERENCES },
63 { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CACHE_MISSES },
Peter Zijlstraf4dbfa82009-06-11 14:06:28 +020064
Ingo Molnara21ca2c2009-06-06 09:58:57 +020065};
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;
Chris Wilson933da832009-10-04 01:35:01 +010074static pid_t target_pid = -1;
75static pid_t child_pid = -1;
Ingo Molnar0cfb7a12009-06-27 06:10:30 +020076static int null_run = 0;
Ingo Molnarddcacfa2009-04-20 15:37:32 +020077
Ingo Molnarddcacfa2009-04-20 15:37:32 +020078static int fd[MAX_NR_CPUS][MAX_COUNTERS];
79
Peter Zijlstra63d40de2009-09-04 17:03:13 +020080static int event_scaled[MAX_COUNTERS];
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +053081
Peter Zijlstra506d4bc2009-09-04 15:36:12 +020082struct stats
83{
Peter Zijlstra8a026312009-09-04 17:26:26 +020084 double n, mean, M2;
Peter Zijlstra506d4bc2009-09-04 15:36:12 +020085};
Ingo Molnar42202dd2009-06-13 14:57:28 +020086
Peter Zijlstra9e9772c2009-09-04 15:36:08 +020087static void update_stats(struct stats *stats, u64 val)
88{
Peter Zijlstra8a026312009-09-04 17:26:26 +020089 double delta;
Peter Zijlstra9e9772c2009-09-04 15:36:08 +020090
Peter Zijlstra8a026312009-09-04 17:26:26 +020091 stats->n++;
92 delta = val - stats->mean;
93 stats->mean += delta / stats->n;
94 stats->M2 += delta*(val - stats->mean);
Peter Zijlstra9e9772c2009-09-04 15:36:08 +020095}
96
Peter Zijlstra506d4bc2009-09-04 15:36:12 +020097static double avg_stats(struct stats *stats)
98{
Peter Zijlstra8a026312009-09-04 17:26:26 +020099 return stats->mean;
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200100}
Ingo Molnar42202dd2009-06-13 14:57:28 +0200101
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200102/*
Peter Zijlstra63d40de2009-09-04 17:03:13 +0200103 * http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
104 *
Peter Zijlstra8a026312009-09-04 17:26:26 +0200105 * (\Sum n_i^2) - ((\Sum n_i)^2)/n
106 * s^2 = -------------------------------
107 * n - 1
Peter Zijlstra63d40de2009-09-04 17:03:13 +0200108 *
109 * http://en.wikipedia.org/wiki/Stddev
110 *
111 * The std dev of the mean is related to the std dev by:
112 *
113 * s
114 * s_mean = -------
115 * sqrt(n)
116 *
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200117 */
118static double stddev_stats(struct stats *stats)
119{
Peter Zijlstra8a026312009-09-04 17:26:26 +0200120 double variance = stats->M2 / (stats->n - 1);
121 double variance_mean = variance / stats->n;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200122
Peter Zijlstra63d40de2009-09-04 17:03:13 +0200123 return sqrt(variance_mean);
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200124}
Ingo Molnar42202dd2009-06-13 14:57:28 +0200125
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200126struct stats event_res_stats[MAX_COUNTERS][3];
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200127struct stats runtime_nsecs_stats;
128struct stats walltime_nsecs_stats;
129struct stats runtime_cycles_stats;
Anton Blanchard11018202009-10-18 22:29:23 +1100130struct stats runtime_branches_stats;
Ingo Molnarbe1ac0d2009-05-29 09:10:54 +0200131
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530132#define MATCH_EVENT(t, c, counter) \
133 (attrs[counter].type == PERF_TYPE_##t && \
134 attrs[counter].config == PERF_COUNT_##c)
135
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530136#define ERR_PERF_OPEN \
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200137"Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n"
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530138
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000139static void create_perf_stat_counter(int counter, int pid)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200140{
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200141 struct perf_event_attr *attr = attrs + counter;
Peter Zijlstra16c8a102009-05-05 17:50:27 +0200142
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200143 if (scale)
Ingo Molnara21ca2c2009-06-06 09:58:57 +0200144 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
145 PERF_FORMAT_TOTAL_TIME_RUNNING;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200146
147 if (system_wide) {
Ingo Molnarf37a2912009-07-01 12:37:06 +0200148 unsigned int cpu;
149
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530150 for (cpu = 0; cpu < nr_cpus; cpu++) {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200151 fd[cpu][counter] = sys_perf_event_open(attr, -1, cpu, -1, 0);
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530152 if (fd[cpu][counter] < 0 && verbose)
153 fprintf(stderr, ERR_PERF_OPEN, counter,
154 fd[cpu][counter], strerror(errno));
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200155 }
156 } else {
Paul Mackerras57e79862009-06-30 16:07:19 +1000157 attr->inherit = inherit;
158 attr->disabled = 1;
159 attr->enable_on_exec = 1;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200160
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200161 fd[0][counter] = sys_perf_event_open(attr, pid, -1, -1, 0);
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530162 if (fd[0][counter] < 0 && verbose)
163 fprintf(stderr, ERR_PERF_OPEN, counter,
164 fd[0][counter], strerror(errno));
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200165 }
166}
167
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200168/*
169 * Does the counter have nsecs as a unit?
170 */
171static inline int nsec_counter(int counter)
172{
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530173 if (MATCH_EVENT(SOFTWARE, SW_CPU_CLOCK, counter) ||
174 MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200175 return 1;
176
177 return 0;
178}
179
180/*
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200181 * Read out the results of a single counter:
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200182 */
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200183static void read_counter(int counter)
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200184{
Peter Zijlstra849abde2009-09-04 18:23:38 +0200185 u64 count[3], single_count[3];
Ingo Molnarf37a2912009-07-01 12:37:06 +0200186 unsigned int cpu;
187 size_t res, nv;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200188 int scaled;
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200189 int i;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200190
191 count[0] = count[1] = count[2] = 0;
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200192
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200193 nv = scale ? 3 : 1;
Jaswinder Singh Rajputcca03c02009-06-23 17:12:49 +0530194 for (cpu = 0; cpu < nr_cpus; cpu++) {
Ingo Molnar743ee1f2009-06-07 17:06:46 +0200195 if (fd[cpu][counter] < 0)
196 continue;
197
Paul Mackerras9cffa8d2009-06-19 22:21:42 +1000198 res = read(fd[cpu][counter], single_count, nv * sizeof(u64));
199 assert(res == nv * sizeof(u64));
Ingo Molnarf37a2912009-07-01 12:37:06 +0200200
Ingo Molnar42202dd2009-06-13 14:57:28 +0200201 close(fd[cpu][counter]);
202 fd[cpu][counter] = -1;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200203
204 count[0] += single_count[0];
205 if (scale) {
206 count[1] += single_count[1];
207 count[2] += single_count[2];
208 }
209 }
210
211 scaled = 0;
212 if (scale) {
213 if (count[2] == 0) {
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200214 event_scaled[counter] = -1;
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200215 count[0] = 0;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200216 return;
217 }
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200218
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200219 if (count[2] < count[1]) {
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200220 event_scaled[counter] = 1;
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200221 count[0] = (unsigned long long)
222 ((double)count[0] * count[1] / count[2] + 0.5);
223 }
224 }
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200225
226 for (i = 0; i < 3; i++)
227 update_stats(&event_res_stats[counter][i], count[i]);
228
229 if (verbose) {
230 fprintf(stderr, "%s: %Ld %Ld %Ld\n", event_name(counter),
231 count[0], count[1], count[2]);
232 }
233
Ingo Molnarbe1ac0d2009-05-29 09:10:54 +0200234 /*
235 * Save the full runtime - to allow normalization during printout:
236 */
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530237 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter))
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200238 update_stats(&runtime_nsecs_stats, count[0]);
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530239 if (MATCH_EVENT(HARDWARE, HW_CPU_CYCLES, counter))
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200240 update_stats(&runtime_cycles_stats, count[0]);
Anton Blanchard11018202009-10-18 22:29:23 +1100241 if (MATCH_EVENT(HARDWARE, HW_BRANCH_INSTRUCTIONS, counter))
242 update_stats(&runtime_branches_stats, count[0]);
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200243}
244
Ingo Molnarf37a2912009-07-01 12:37:06 +0200245static int run_perf_stat(int argc __used, const char **argv)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200246{
247 unsigned long long t0, t1;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200248 int status = 0;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200249 int counter;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200250 int pid;
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000251 int child_ready_pipe[2], go_pipe[2];
252 char buf;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200253
254 if (!system_wide)
255 nr_cpus = 1;
256
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000257 if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
258 perror("failed to create pipes");
259 exit(1);
260 }
261
262 if ((pid = fork()) < 0)
263 perror("failed to fork");
264
265 if (!pid) {
266 close(child_ready_pipe[0]);
267 close(go_pipe[1]);
268 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
269
270 /*
271 * Do a dummy execvp to get the PLT entry resolved,
272 * so we avoid the resolver overhead on the real
273 * execvp call.
274 */
275 execvp("", (char **)argv);
276
277 /*
278 * Tell the parent we're ready to go
279 */
280 close(child_ready_pipe[1]);
281
282 /*
283 * Wait until the parent tells us to go.
284 */
Frederic Weisbeckera92bef02009-07-01 21:02:10 +0200285 if (read(go_pipe[0], &buf, 1) == -1)
286 perror("unable to read pipe");
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000287
288 execvp(argv[0], (char **)argv);
289
290 perror(argv[0]);
291 exit(-1);
292 }
293
Chris Wilson933da832009-10-04 01:35:01 +0100294 child_pid = pid;
295
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000296 /*
297 * Wait for the child to be ready to exec.
298 */
299 close(child_ready_pipe[1]);
300 close(go_pipe[0]);
Frederic Weisbeckera92bef02009-07-01 21:02:10 +0200301 if (read(child_ready_pipe[0], &buf, 1) == -1)
302 perror("unable to read pipe");
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000303 close(child_ready_pipe[0]);
304
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200305 for (counter = 0; counter < nr_counters; counter++)
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000306 create_perf_stat_counter(counter, pid);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200307
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200308 /*
309 * Enable counters and exec the command:
310 */
311 t0 = rdclock();
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200312
Paul Mackerras051ae7f2009-06-29 21:13:21 +1000313 close(go_pipe[1]);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200314 wait(&status);
Ingo Molnar44db76c2009-06-03 19:36:07 +0200315
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200316 t1 = rdclock();
317
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200318 update_stats(&walltime_nsecs_stats, t1 - t0);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200319
320 for (counter = 0; counter < nr_counters; counter++)
321 read_counter(counter);
322
323 return WEXITSTATUS(status);
324}
325
Peter Zijlstra849abde2009-09-04 18:23:38 +0200326static void print_noise(int counter, double avg)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200327{
Peter Zijlstra849abde2009-09-04 18:23:38 +0200328 if (run_count == 1)
329 return;
330
331 fprintf(stderr, " ( +- %7.3f%% )",
332 100 * stddev_stats(&event_res_stats[counter][0]) / avg);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200333}
334
Peter Zijlstra849abde2009-09-04 18:23:38 +0200335static void nsec_printout(int counter, double avg)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200336{
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200337 double msecs = avg / 1e6;
Ingo Molnar42202dd2009-06-13 14:57:28 +0200338
Jaswinder Singh Rajput6e750a8f2009-06-27 03:02:07 +0530339 fprintf(stderr, " %14.6f %-24s", msecs, event_name(counter));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200340
Jaswinder Singh Rajputb9ebdcc2009-07-01 15:05:09 +0530341 if (MATCH_EVENT(SOFTWARE, SW_TASK_CLOCK, counter)) {
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200342 fprintf(stderr, " # %10.3f CPUs ",
343 avg / avg_stats(&walltime_nsecs_stats));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200344 }
Ingo Molnar42202dd2009-06-13 14:57:28 +0200345}
346
Peter Zijlstra849abde2009-09-04 18:23:38 +0200347static void abs_printout(int counter, double avg)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200348{
Ingo Molnarc7f7fea2009-09-22 14:53:51 +0200349 double total, ratio = 0.0;
350
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200351 fprintf(stderr, " %14.0f %-24s", avg, event_name(counter));
Ingo Molnar42202dd2009-06-13 14:57:28 +0200352
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200353 if (MATCH_EVENT(HARDWARE, HW_INSTRUCTIONS, counter)) {
Ingo Molnarc7f7fea2009-09-22 14:53:51 +0200354 total = avg_stats(&runtime_cycles_stats);
355
356 if (total)
357 ratio = avg / total;
358
359 fprintf(stderr, " # %10.3f IPC ", ratio);
Lucas De Marchi7255fe22009-11-15 12:05:08 -0200360 } else if (MATCH_EVENT(HARDWARE, HW_BRANCH_MISSES, counter) &&
361 runtime_branches_stats.n != 0) {
Anton Blanchard11018202009-10-18 22:29:23 +1100362 total = avg_stats(&runtime_branches_stats);
363
364 if (total)
365 ratio = avg * 100 / total;
366
Ingo Molnardd86e722009-10-19 13:33:03 +0200367 fprintf(stderr, " # %10.3f %% ", ratio);
Anton Blanchard11018202009-10-18 22:29:23 +1100368
Lucas De Marchi7255fe22009-11-15 12:05:08 -0200369 } else if (runtime_nsecs_stats.n != 0) {
Ingo Molnarc7f7fea2009-09-22 14:53:51 +0200370 total = avg_stats(&runtime_nsecs_stats);
371
372 if (total)
373 ratio = 1000.0 * avg / total;
374
375 fprintf(stderr, " # %10.3f M/sec", ratio);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200376 }
Ingo Molnar42202dd2009-06-13 14:57:28 +0200377}
378
379/*
380 * Print out the results of a single counter:
381 */
382static void print_counter(int counter)
383{
Peter Zijlstra849abde2009-09-04 18:23:38 +0200384 double avg = avg_stats(&event_res_stats[counter][0]);
Peter Zijlstra63d40de2009-09-04 17:03:13 +0200385 int scaled = event_scaled[counter];
Ingo Molnar42202dd2009-06-13 14:57:28 +0200386
Ingo Molnar42202dd2009-06-13 14:57:28 +0200387 if (scaled == -1) {
Jaswinder Singh Rajput6e750a8f2009-06-27 03:02:07 +0530388 fprintf(stderr, " %14s %-24s\n",
Ingo Molnar42202dd2009-06-13 14:57:28 +0200389 "<not counted>", event_name(counter));
390 return;
391 }
392
393 if (nsec_counter(counter))
Peter Zijlstra849abde2009-09-04 18:23:38 +0200394 nsec_printout(counter, avg);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200395 else
Peter Zijlstra849abde2009-09-04 18:23:38 +0200396 abs_printout(counter, avg);
397
398 print_noise(counter, avg);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200399
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200400 if (scaled) {
401 double avg_enabled, avg_running;
402
403 avg_enabled = avg_stats(&event_res_stats[counter][1]);
404 avg_running = avg_stats(&event_res_stats[counter][2]);
405
Ingo Molnar210ad392009-06-29 21:50:54 +0200406 fprintf(stderr, " (scaled from %.2f%%)",
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200407 100 * avg_running / avg_enabled);
408 }
Ingo Molnar42202dd2009-06-13 14:57:28 +0200409
410 fprintf(stderr, "\n");
411}
412
Ingo Molnar42202dd2009-06-13 14:57:28 +0200413static void print_stat(int argc, const char **argv)
414{
415 int i, counter;
416
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200417 fflush(stdout);
418
419 fprintf(stderr, "\n");
Ingo Molnar44db76c2009-06-03 19:36:07 +0200420 fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
421
422 for (i = 1; i < argc; i++)
423 fprintf(stderr, " %s", argv[i]);
424
Ingo Molnar42202dd2009-06-13 14:57:28 +0200425 fprintf(stderr, "\'");
426 if (run_count > 1)
427 fprintf(stderr, " (%d runs)", run_count);
428 fprintf(stderr, ":\n\n");
Ingo Molnar2996f5d2009-05-29 09:10:54 +0200429
430 for (counter = 0; counter < nr_counters; counter++)
Ingo Molnarc04f5e52009-05-29 09:10:54 +0200431 print_counter(counter);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200432
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200433 fprintf(stderr, "\n");
Ingo Molnar566747e2009-06-27 06:24:32 +0200434 fprintf(stderr, " %14.9f seconds time elapsed",
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200435 avg_stats(&walltime_nsecs_stats)/1e9);
Ingo Molnar566747e2009-06-27 06:24:32 +0200436 if (run_count > 1) {
437 fprintf(stderr, " ( +- %7.3f%% )",
Peter Zijlstra506d4bc2009-09-04 15:36:12 +0200438 100*stddev_stats(&walltime_nsecs_stats) /
439 avg_stats(&walltime_nsecs_stats));
Ingo Molnar566747e2009-06-27 06:24:32 +0200440 }
441 fprintf(stderr, "\n\n");
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200442}
443
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200444static volatile int signr = -1;
445
Ingo Molnar52425192009-05-26 09:17:18 +0200446static void skip_signal(int signo)
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200447{
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200448 signr = signo;
449}
450
451static void sig_atexit(void)
452{
Chris Wilson933da832009-10-04 01:35:01 +0100453 if (child_pid != -1)
454 kill(child_pid, SIGTERM);
455
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200456 if (signr == -1)
457 return;
458
459 signal(signr, SIG_DFL);
460 kill(getpid(), signr);
Ingo Molnar52425192009-05-26 09:17:18 +0200461}
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200462
Ingo Molnar52425192009-05-26 09:17:18 +0200463static const char * const stat_usage[] = {
464 "perf stat [<options>] <command>",
465 NULL
466};
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200467
Ingo Molnar52425192009-05-26 09:17:18 +0200468static const struct option options[] = {
469 OPT_CALLBACK('e', "event", NULL, "event",
Thomas Gleixner86847b62009-06-06 12:24:17 +0200470 "event selector. use 'perf list' to list available events",
471 parse_events),
Ingo Molnar52425192009-05-26 09:17:18 +0200472 OPT_BOOLEAN('i', "inherit", &inherit,
473 "child tasks inherit counters"),
474 OPT_INTEGER('p', "pid", &target_pid,
475 "stat events on existing pid"),
476 OPT_BOOLEAN('a', "all-cpus", &system_wide,
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530477 "system-wide collection from all CPUs"),
Brice Goglinb26bc5a2009-08-07 10:18:39 +0200478 OPT_BOOLEAN('c', "scale", &scale,
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530479 "scale/normalize counters"),
Ingo Molnar743ee1f2009-06-07 17:06:46 +0200480 OPT_BOOLEAN('v', "verbose", &verbose,
481 "be more verbose (show counter open errors, etc)"),
Ingo Molnar42202dd2009-06-13 14:57:28 +0200482 OPT_INTEGER('r', "repeat", &run_count,
483 "repeat command and print average + stddev (max: 100)"),
Ingo Molnar0cfb7a12009-06-27 06:10:30 +0200484 OPT_BOOLEAN('n', "null", &null_run,
485 "null run - dont start any counters"),
Ingo Molnar52425192009-05-26 09:17:18 +0200486 OPT_END()
487};
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200488
Ingo Molnarf37a2912009-07-01 12:37:06 +0200489int cmd_stat(int argc, const char **argv, const char *prefix __used)
Ingo Molnar52425192009-05-26 09:17:18 +0200490{
Ingo Molnar42202dd2009-06-13 14:57:28 +0200491 int status;
492
Anton Blancharda0541232009-07-22 23:04:12 +1000493 argc = parse_options(argc, argv, options, stat_usage,
494 PARSE_OPT_STOP_AT_NON_OPTION);
Ingo Molnar52425192009-05-26 09:17:18 +0200495 if (!argc)
496 usage_with_options(stat_usage, options);
Peter Zijlstra9e9772c2009-09-04 15:36:08 +0200497 if (run_count <= 0)
Ingo Molnar42202dd2009-06-13 14:57:28 +0200498 usage_with_options(stat_usage, options);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200499
Jaswinder Singh Rajputc3043562009-06-27 23:49:09 +0530500 /* Set attrs and nr_counters if no event is selected and !null_run */
501 if (!null_run && !nr_counters) {
502 memcpy(attrs, default_attrs, sizeof(default_attrs));
503 nr_counters = ARRAY_SIZE(default_attrs);
504 }
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200505
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200506 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
507 assert(nr_cpus <= MAX_NR_CPUS);
Ingo Molnarf37a2912009-07-01 12:37:06 +0200508 assert((int)nr_cpus >= 0);
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200509
Ingo Molnar58d7e992009-05-15 11:03:23 +0200510 /*
511 * We dont want to block the signals - that would cause
512 * child tasks to inherit that and Ctrl-C would not work.
513 * What we want is for Ctrl-C to work in the exec()-ed
514 * task, but being ignored by perf stat itself:
515 */
Peter Zijlstraf7b7c262009-06-10 15:55:59 +0200516 atexit(sig_atexit);
Ingo Molnar58d7e992009-05-15 11:03:23 +0200517 signal(SIGINT, skip_signal);
518 signal(SIGALRM, skip_signal);
519 signal(SIGABRT, skip_signal);
520
Ingo Molnar42202dd2009-06-13 14:57:28 +0200521 status = 0;
522 for (run_idx = 0; run_idx < run_count; run_idx++) {
523 if (run_count != 1 && verbose)
Jaswinder Singh Rajput3d632592009-06-24 18:19:34 +0530524 fprintf(stderr, "[ perf stat: executing run #%d ... ]\n", run_idx + 1);
Ingo Molnar42202dd2009-06-13 14:57:28 +0200525 status = run_perf_stat(argc, argv);
526 }
527
528 print_stat(argc, argv);
529
530 return status;
Ingo Molnarddcacfa2009-04-20 15:37:32 +0200531}