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ddcacfa0 IM |
1 | /* |
2 | * kerneltop.c: show top kernel functions - performance counters showcase | |
3 | ||
4 | Build with: | |
5 | ||
6 | cc -O6 -Wall -c -o kerneltop.o kerneltop.c -lrt | |
7 | ||
8 | Sample output: | |
9 | ||
10 | ------------------------------------------------------------------------------ | |
11 | KernelTop: 2669 irqs/sec [NMI, cache-misses/cache-refs], (all, cpu: 2) | |
12 | ------------------------------------------------------------------------------ | |
13 | ||
14 | weight RIP kernel function | |
15 | ______ ________________ _______________ | |
16 | ||
17 | 35.20 - ffffffff804ce74b : skb_copy_and_csum_dev | |
18 | 33.00 - ffffffff804cb740 : sock_alloc_send_skb | |
19 | 31.26 - ffffffff804ce808 : skb_push | |
20 | 22.43 - ffffffff80510004 : tcp_established_options | |
21 | 19.00 - ffffffff8027d250 : find_get_page | |
22 | 15.76 - ffffffff804e4fc9 : eth_type_trans | |
23 | 15.20 - ffffffff804d8baa : dst_release | |
24 | 14.86 - ffffffff804cf5d8 : skb_release_head_state | |
25 | 14.00 - ffffffff802217d5 : read_hpet | |
26 | 12.00 - ffffffff804ffb7f : __ip_local_out | |
27 | 11.97 - ffffffff804fc0c8 : ip_local_deliver_finish | |
28 | 8.54 - ffffffff805001a3 : ip_queue_xmit | |
29 | */ | |
30 | ||
31 | /* | |
32 | * perfstat: /usr/bin/time -alike performance counter statistics utility | |
33 | ||
34 | It summarizes the counter events of all tasks (and child tasks), | |
35 | covering all CPUs that the command (or workload) executes on. | |
36 | It only counts the per-task events of the workload started, | |
37 | independent of how many other tasks run on those CPUs. | |
38 | ||
39 | Sample output: | |
40 | ||
41 | $ ./perfstat -e 1 -e 3 -e 5 ls -lR /usr/include/ >/dev/null | |
42 | ||
43 | Performance counter stats for 'ls': | |
44 | ||
45 | 163516953 instructions | |
46 | 2295 cache-misses | |
47 | 2855182 branch-misses | |
48 | */ | |
49 | ||
50 | /* | |
51 | * Copyright (C) 2008, Red Hat Inc, Ingo Molnar <mingo@redhat.com> | |
52 | * | |
53 | * Improvements and fixes by: | |
54 | * | |
55 | * Arjan van de Ven <arjan@linux.intel.com> | |
56 | * Yanmin Zhang <yanmin.zhang@intel.com> | |
57 | * Wu Fengguang <fengguang.wu@intel.com> | |
58 | * Mike Galbraith <efault@gmx.de> | |
59 | * Paul Mackerras <paulus@samba.org> | |
60 | * | |
61 | * Released under the GPL v2. (and only v2, not any later version) | |
62 | */ | |
63 | ||
64 | #include "util.h" | |
65 | ||
66 | #include <getopt.h> | |
67 | #include <assert.h> | |
68 | #include <fcntl.h> | |
69 | #include <stdio.h> | |
70 | #include <errno.h> | |
71 | #include <ctype.h> | |
72 | #include <time.h> | |
73 | #include <sched.h> | |
74 | #include <pthread.h> | |
75 | ||
76 | #include <sys/syscall.h> | |
77 | #include <sys/ioctl.h> | |
78 | #include <sys/poll.h> | |
79 | #include <sys/prctl.h> | |
80 | #include <sys/wait.h> | |
81 | #include <sys/uio.h> | |
82 | #include <sys/mman.h> | |
83 | ||
84 | #include <linux/unistd.h> | |
85 | #include <linux/types.h> | |
86 | ||
87 | #include "../../include/linux/perf_counter.h" | |
88 | ||
89 | ||
90 | /* | |
91 | * prctl(PR_TASK_PERF_COUNTERS_DISABLE) will (cheaply) disable all | |
92 | * counters in the current task. | |
93 | */ | |
94 | #define PR_TASK_PERF_COUNTERS_DISABLE 31 | |
95 | #define PR_TASK_PERF_COUNTERS_ENABLE 32 | |
96 | ||
97 | #define rdclock() \ | |
98 | ({ \ | |
99 | struct timespec ts; \ | |
100 | \ | |
101 | clock_gettime(CLOCK_MONOTONIC, &ts); \ | |
102 | ts.tv_sec * 1000000000ULL + ts.tv_nsec; \ | |
103 | }) | |
104 | ||
105 | /* | |
106 | * Pick up some kernel type conventions: | |
107 | */ | |
108 | #define __user | |
109 | #define asmlinkage | |
110 | ||
111 | #ifdef __x86_64__ | |
112 | #define __NR_perf_counter_open 295 | |
113 | #define rmb() asm volatile("lfence" ::: "memory") | |
114 | #define cpu_relax() asm volatile("rep; nop" ::: "memory"); | |
115 | #endif | |
116 | ||
117 | #ifdef __i386__ | |
118 | #define __NR_perf_counter_open 333 | |
119 | #define rmb() asm volatile("lfence" ::: "memory") | |
120 | #define cpu_relax() asm volatile("rep; nop" ::: "memory"); | |
121 | #endif | |
122 | ||
123 | #ifdef __powerpc__ | |
124 | #define __NR_perf_counter_open 319 | |
125 | #define rmb() asm volatile ("sync" ::: "memory") | |
126 | #define cpu_relax() asm volatile ("" ::: "memory"); | |
127 | #endif | |
128 | ||
129 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
130 | #define min(x, y) ({ \ | |
131 | typeof(x) _min1 = (x); \ | |
132 | typeof(y) _min2 = (y); \ | |
133 | (void) (&_min1 == &_min2); \ | |
134 | _min1 < _min2 ? _min1 : _min2; }) | |
135 | ||
136 | extern asmlinkage int sys_perf_counter_open( | |
137 | struct perf_counter_hw_event *hw_event_uptr __user, | |
138 | pid_t pid, | |
139 | int cpu, | |
140 | int group_fd, | |
141 | unsigned long flags); | |
142 | ||
143 | #define MAX_COUNTERS 64 | |
144 | #define MAX_NR_CPUS 256 | |
145 | ||
146 | #define EID(type, id) (((__u64)(type) << PERF_COUNTER_TYPE_SHIFT) | (id)) | |
147 | ||
148 | static int system_wide = 0; | |
149 | ||
150 | static int nr_counters = 0; | |
151 | static __u64 event_id[MAX_COUNTERS] = { | |
152 | EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), | |
153 | EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), | |
154 | EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), | |
155 | EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), | |
156 | ||
157 | EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), | |
158 | EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), | |
159 | EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), | |
160 | EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), | |
161 | }; | |
162 | static int default_interval = 100000; | |
163 | static int event_count[MAX_COUNTERS]; | |
164 | static int fd[MAX_NR_CPUS][MAX_COUNTERS]; | |
165 | ||
166 | static int tid = -1; | |
167 | static int profile_cpu = -1; | |
168 | static int nr_cpus = 0; | |
169 | static int nmi = 1; | |
170 | static int group = 0; | |
171 | static unsigned int page_size; | |
172 | ||
173 | static int zero; | |
174 | ||
175 | static int scale; | |
176 | ||
177 | static const unsigned int default_count[] = { | |
178 | 1000000, | |
179 | 1000000, | |
180 | 10000, | |
181 | 10000, | |
182 | 1000000, | |
183 | 10000, | |
184 | }; | |
185 | ||
186 | static char *hw_event_names[] = { | |
187 | "CPU cycles", | |
188 | "instructions", | |
189 | "cache references", | |
190 | "cache misses", | |
191 | "branches", | |
192 | "branch misses", | |
193 | "bus cycles", | |
194 | }; | |
195 | ||
196 | static char *sw_event_names[] = { | |
197 | "cpu clock ticks", | |
198 | "task clock ticks", | |
199 | "pagefaults", | |
200 | "context switches", | |
201 | "CPU migrations", | |
202 | "minor faults", | |
203 | "major faults", | |
204 | }; | |
205 | ||
206 | struct event_symbol { | |
207 | __u64 event; | |
208 | char *symbol; | |
209 | }; | |
210 | ||
211 | static struct event_symbol event_symbols[] = { | |
212 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cpu-cycles", }, | |
213 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CPU_CYCLES), "cycles", }, | |
214 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_INSTRUCTIONS), "instructions", }, | |
215 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_REFERENCES), "cache-references", }, | |
216 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_CACHE_MISSES), "cache-misses", }, | |
217 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branch-instructions", }, | |
218 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_INSTRUCTIONS), "branches", }, | |
219 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BRANCH_MISSES), "branch-misses", }, | |
220 | {EID(PERF_TYPE_HARDWARE, PERF_COUNT_BUS_CYCLES), "bus-cycles", }, | |
221 | ||
222 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK), "cpu-clock", }, | |
223 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK), "task-clock", }, | |
224 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "page-faults", }, | |
225 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS), "faults", }, | |
226 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MIN), "minor-faults", }, | |
227 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_PAGE_FAULTS_MAJ), "major-faults", }, | |
228 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "context-switches", }, | |
229 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CONTEXT_SWITCHES), "cs", }, | |
230 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "cpu-migrations", }, | |
231 | {EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_MIGRATIONS), "migrations", }, | |
232 | }; | |
233 | ||
234 | #define __PERF_COUNTER_FIELD(config, name) \ | |
235 | ((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT) | |
236 | ||
237 | #define PERF_COUNTER_RAW(config) __PERF_COUNTER_FIELD(config, RAW) | |
238 | #define PERF_COUNTER_CONFIG(config) __PERF_COUNTER_FIELD(config, CONFIG) | |
239 | #define PERF_COUNTER_TYPE(config) __PERF_COUNTER_FIELD(config, TYPE) | |
240 | #define PERF_COUNTER_ID(config) __PERF_COUNTER_FIELD(config, EVENT) | |
241 | ||
242 | static void display_events_help(void) | |
243 | { | |
244 | unsigned int i; | |
245 | __u64 e; | |
246 | ||
247 | printf( | |
248 | " -e EVENT --event=EVENT # symbolic-name abbreviations"); | |
249 | ||
250 | for (i = 0; i < ARRAY_SIZE(event_symbols); i++) { | |
251 | int type, id; | |
252 | ||
253 | e = event_symbols[i].event; | |
254 | type = PERF_COUNTER_TYPE(e); | |
255 | id = PERF_COUNTER_ID(e); | |
256 | ||
257 | printf("\n %d:%d: %-20s", | |
258 | type, id, event_symbols[i].symbol); | |
259 | } | |
260 | ||
261 | printf("\n" | |
262 | " rNNN: raw PMU events (eventsel+umask)\n\n"); | |
263 | } | |
264 | ||
265 | static void display_help(void) | |
266 | { | |
267 | printf( | |
268 | "Usage: perfstat [<events...>] <cmd...>\n\n" | |
269 | "PerfStat Options (up to %d event types can be specified):\n\n", | |
270 | MAX_COUNTERS); | |
271 | ||
272 | display_events_help(); | |
273 | ||
274 | printf( | |
275 | " -l # scale counter values\n" | |
276 | " -a # system-wide collection\n"); | |
277 | exit(0); | |
278 | } | |
279 | ||
280 | static char *event_name(int ctr) | |
281 | { | |
282 | __u64 config = event_id[ctr]; | |
283 | int type = PERF_COUNTER_TYPE(config); | |
284 | int id = PERF_COUNTER_ID(config); | |
285 | static char buf[32]; | |
286 | ||
287 | if (PERF_COUNTER_RAW(config)) { | |
288 | sprintf(buf, "raw 0x%llx", PERF_COUNTER_CONFIG(config)); | |
289 | return buf; | |
290 | } | |
291 | ||
292 | switch (type) { | |
293 | case PERF_TYPE_HARDWARE: | |
294 | if (id < PERF_HW_EVENTS_MAX) | |
295 | return hw_event_names[id]; | |
296 | return "unknown-hardware"; | |
297 | ||
298 | case PERF_TYPE_SOFTWARE: | |
299 | if (id < PERF_SW_EVENTS_MAX) | |
300 | return sw_event_names[id]; | |
301 | return "unknown-software"; | |
302 | ||
303 | default: | |
304 | break; | |
305 | } | |
306 | ||
307 | return "unknown"; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Each event can have multiple symbolic names. | |
312 | * Symbolic names are (almost) exactly matched. | |
313 | */ | |
314 | static __u64 match_event_symbols(char *str) | |
315 | { | |
316 | __u64 config, id; | |
317 | int type; | |
318 | unsigned int i; | |
319 | ||
320 | if (sscanf(str, "r%llx", &config) == 1) | |
321 | return config | PERF_COUNTER_RAW_MASK; | |
322 | ||
323 | if (sscanf(str, "%d:%llu", &type, &id) == 2) | |
324 | return EID(type, id); | |
325 | ||
326 | for (i = 0; i < ARRAY_SIZE(event_symbols); i++) { | |
327 | if (!strncmp(str, event_symbols[i].symbol, | |
328 | strlen(event_symbols[i].symbol))) | |
329 | return event_symbols[i].event; | |
330 | } | |
331 | ||
332 | return ~0ULL; | |
333 | } | |
334 | ||
335 | static int parse_events(char *str) | |
336 | { | |
337 | __u64 config; | |
338 | ||
339 | again: | |
340 | if (nr_counters == MAX_COUNTERS) | |
341 | return -1; | |
342 | ||
343 | config = match_event_symbols(str); | |
344 | if (config == ~0ULL) | |
345 | return -1; | |
346 | ||
347 | event_id[nr_counters] = config; | |
348 | nr_counters++; | |
349 | ||
350 | str = strstr(str, ","); | |
351 | if (str) { | |
352 | str++; | |
353 | goto again; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | ||
360 | /* | |
361 | * perfstat | |
362 | */ | |
363 | ||
364 | char fault_here[1000000]; | |
365 | ||
366 | static void create_perfstat_counter(int counter) | |
367 | { | |
368 | struct perf_counter_hw_event hw_event; | |
369 | ||
370 | memset(&hw_event, 0, sizeof(hw_event)); | |
371 | hw_event.config = event_id[counter]; | |
372 | hw_event.record_type = 0; | |
373 | hw_event.nmi = 0; | |
374 | if (scale) | |
375 | hw_event.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | | |
376 | PERF_FORMAT_TOTAL_TIME_RUNNING; | |
377 | ||
378 | if (system_wide) { | |
379 | int cpu; | |
380 | for (cpu = 0; cpu < nr_cpus; cpu ++) { | |
381 | fd[cpu][counter] = sys_perf_counter_open(&hw_event, -1, cpu, -1, 0); | |
382 | if (fd[cpu][counter] < 0) { | |
383 | printf("perfstat error: syscall returned with %d (%s)\n", | |
384 | fd[cpu][counter], strerror(errno)); | |
385 | exit(-1); | |
386 | } | |
387 | } | |
388 | } else { | |
389 | hw_event.inherit = 1; | |
390 | hw_event.disabled = 1; | |
391 | ||
392 | fd[0][counter] = sys_perf_counter_open(&hw_event, 0, -1, -1, 0); | |
393 | if (fd[0][counter] < 0) { | |
394 | printf("perfstat error: syscall returned with %d (%s)\n", | |
395 | fd[0][counter], strerror(errno)); | |
396 | exit(-1); | |
397 | } | |
398 | } | |
399 | } | |
400 | ||
401 | int do_perfstat(int argc, char *argv[]) | |
402 | { | |
403 | unsigned long long t0, t1; | |
404 | int counter; | |
405 | ssize_t res; | |
406 | int status; | |
407 | int pid; | |
408 | ||
409 | if (!system_wide) | |
410 | nr_cpus = 1; | |
411 | ||
412 | for (counter = 0; counter < nr_counters; counter++) | |
413 | create_perfstat_counter(counter); | |
414 | ||
415 | argc -= optind; | |
416 | argv += optind; | |
417 | ||
418 | if (!argc) | |
419 | display_help(); | |
420 | ||
421 | /* | |
422 | * Enable counters and exec the command: | |
423 | */ | |
424 | t0 = rdclock(); | |
425 | prctl(PR_TASK_PERF_COUNTERS_ENABLE); | |
426 | ||
427 | if ((pid = fork()) < 0) | |
428 | perror("failed to fork"); | |
429 | if (!pid) { | |
430 | if (execvp(argv[0], argv)) { | |
431 | perror(argv[0]); | |
432 | exit(-1); | |
433 | } | |
434 | } | |
435 | while (wait(&status) >= 0) | |
436 | ; | |
437 | prctl(PR_TASK_PERF_COUNTERS_DISABLE); | |
438 | t1 = rdclock(); | |
439 | ||
440 | fflush(stdout); | |
441 | ||
442 | fprintf(stderr, "\n"); | |
443 | fprintf(stderr, " Performance counter stats for \'%s\':\n", | |
444 | argv[0]); | |
445 | fprintf(stderr, "\n"); | |
446 | ||
447 | for (counter = 0; counter < nr_counters; counter++) { | |
448 | int cpu, nv; | |
449 | __u64 count[3], single_count[3]; | |
450 | int scaled; | |
451 | ||
452 | count[0] = count[1] = count[2] = 0; | |
453 | nv = scale ? 3 : 1; | |
454 | for (cpu = 0; cpu < nr_cpus; cpu ++) { | |
455 | res = read(fd[cpu][counter], | |
456 | single_count, nv * sizeof(__u64)); | |
457 | assert(res == nv * sizeof(__u64)); | |
458 | ||
459 | count[0] += single_count[0]; | |
460 | if (scale) { | |
461 | count[1] += single_count[1]; | |
462 | count[2] += single_count[2]; | |
463 | } | |
464 | } | |
465 | ||
466 | scaled = 0; | |
467 | if (scale) { | |
468 | if (count[2] == 0) { | |
469 | fprintf(stderr, " %14s %-20s\n", | |
470 | "<not counted>", event_name(counter)); | |
471 | continue; | |
472 | } | |
473 | if (count[2] < count[1]) { | |
474 | scaled = 1; | |
475 | count[0] = (unsigned long long) | |
476 | ((double)count[0] * count[1] / count[2] + 0.5); | |
477 | } | |
478 | } | |
479 | ||
480 | if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) || | |
481 | event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) { | |
482 | ||
483 | double msecs = (double)count[0] / 1000000; | |
484 | ||
485 | fprintf(stderr, " %14.6f %-20s (msecs)", | |
486 | msecs, event_name(counter)); | |
487 | } else { | |
488 | fprintf(stderr, " %14Ld %-20s (events)", | |
489 | count[0], event_name(counter)); | |
490 | } | |
491 | if (scaled) | |
492 | fprintf(stderr, " (scaled from %.2f%%)", | |
493 | (double) count[2] / count[1] * 100); | |
494 | fprintf(stderr, "\n"); | |
495 | } | |
496 | fprintf(stderr, "\n"); | |
497 | fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n", | |
498 | (double)(t1-t0)/1e6); | |
499 | fprintf(stderr, "\n"); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | static void process_options(int argc, char **argv) | |
505 | { | |
506 | int error = 0, counter; | |
507 | ||
508 | for (;;) { | |
509 | int option_index = 0; | |
510 | /** Options for getopt */ | |
511 | static struct option long_options[] = { | |
512 | {"count", required_argument, NULL, 'c'}, | |
513 | {"cpu", required_argument, NULL, 'C'}, | |
514 | {"delay", required_argument, NULL, 'd'}, | |
515 | {"dump_symtab", no_argument, NULL, 'D'}, | |
516 | {"event", required_argument, NULL, 'e'}, | |
517 | {"filter", required_argument, NULL, 'f'}, | |
518 | {"group", required_argument, NULL, 'g'}, | |
519 | {"help", no_argument, NULL, 'h'}, | |
520 | {"nmi", required_argument, NULL, 'n'}, | |
521 | {"munmap_info", no_argument, NULL, 'U'}, | |
522 | {"pid", required_argument, NULL, 'p'}, | |
523 | {"realtime", required_argument, NULL, 'r'}, | |
524 | {"scale", no_argument, NULL, 'l'}, | |
525 | {"symbol", required_argument, NULL, 's'}, | |
526 | {"stat", no_argument, NULL, 'S'}, | |
527 | {"vmlinux", required_argument, NULL, 'x'}, | |
528 | {"zero", no_argument, NULL, 'z'}, | |
529 | {NULL, 0, NULL, 0 } | |
530 | }; | |
531 | int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hln:m:p:r:s:Sx:zMU", | |
532 | long_options, &option_index); | |
533 | if (c == -1) | |
534 | break; | |
535 | ||
536 | switch (c) { | |
537 | case 'a': system_wide = 1; break; | |
538 | case 'c': default_interval = atoi(optarg); break; | |
539 | case 'C': | |
540 | /* CPU and PID are mutually exclusive */ | |
541 | if (tid != -1) { | |
542 | printf("WARNING: CPU switch overriding PID\n"); | |
543 | sleep(1); | |
544 | tid = -1; | |
545 | } | |
546 | profile_cpu = atoi(optarg); break; | |
547 | ||
548 | case 'e': error = parse_events(optarg); break; | |
549 | ||
550 | case 'g': group = atoi(optarg); break; | |
551 | case 'h': display_help(); break; | |
552 | case 'l': scale = 1; break; | |
553 | case 'n': nmi = atoi(optarg); break; | |
554 | case 'p': | |
555 | /* CPU and PID are mutually exclusive */ | |
556 | if (profile_cpu != -1) { | |
557 | printf("WARNING: PID switch overriding CPU\n"); | |
558 | sleep(1); | |
559 | profile_cpu = -1; | |
560 | } | |
561 | tid = atoi(optarg); break; | |
562 | case 'z': zero = 1; break; | |
563 | default: error = 1; break; | |
564 | } | |
565 | } | |
566 | if (error) | |
567 | display_help(); | |
568 | ||
569 | if (!nr_counters) { | |
570 | nr_counters = 8; | |
571 | } | |
572 | ||
573 | for (counter = 0; counter < nr_counters; counter++) { | |
574 | if (event_count[counter]) | |
575 | continue; | |
576 | ||
577 | event_count[counter] = default_interval; | |
578 | } | |
579 | } | |
580 | ||
581 | int cmd_stat(int argc, char **argv, const char *prefix) | |
582 | { | |
583 | page_size = sysconf(_SC_PAGE_SIZE); | |
584 | ||
585 | process_options(argc, argv); | |
586 | ||
587 | nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); | |
588 | assert(nr_cpus <= MAX_NR_CPUS); | |
589 | assert(nr_cpus >= 0); | |
590 | ||
591 | return do_perfstat(argc, argv); | |
592 | } |