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Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
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1 | /* |
2 | * builtin-record.c |
3 | * |
4 | * Builtin record command: Record the profile of a workload |
5 | * (or a CPU, or a PID) into the perf.data output file - for |
6 | * later analysis via perf report. |
7 | */ |
8 | #define _FILE_OFFSET_BITS 64 |
9 | |
10 | #include "builtin.h" |
11 | |
12 | #include "perf.h" |
13 | |
14 | #include "util/build-id.h" |
15 | #include "util/util.h" |
16 | #include "util/parse-options.h" |
17 | #include "util/parse-events.h" |
18 | |
19 | #include "util/header.h" |
20 | #include "util/event.h" |
21 | #include "util/evlist.h" |
22 | #include "util/evsel.h" |
23 | #include "util/debug.h" |
24 | #include "util/session.h" |
25 | #include "util/symbol.h" |
26 | #include "util/cpumap.h" |
27 | #include "util/thread_map.h" |
28 | |
29 | #include <unistd.h> |
30 | #include <sched.h> |
31 | #include <sys/mman.h> |
32 | |
33 | #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y)) |
34 | |
35 | enum write_mode_t { |
36 | WRITE_FORCE, |
37 | WRITE_APPEND |
38 | }; |
39 | |
40 | static u64 user_interval = ULLONG_MAX; |
41 | static u64 default_interval = 0; |
42 | |
43 | static unsigned int page_size; |
44 | static unsigned int mmap_pages = UINT_MAX; |
45 | static unsigned int user_freq = UINT_MAX; |
46 | static int freq = 1000; |
47 | static int output; |
48 | static int pipe_output = 0; |
49 | static const char *output_name = NULL; |
50 | static int group = 0; |
51 | static int realtime_prio = 0; |
52 | static bool nodelay = false; |
53 | static bool raw_samples = false; |
54 | static bool sample_id_all_avail = true; |
55 | static bool system_wide = false; |
56 | static pid_t target_pid = -1; |
57 | static pid_t target_tid = -1; |
58 | static pid_t child_pid = -1; |
59 | static bool no_inherit = false; |
60 | static enum write_mode_t write_mode = WRITE_FORCE; |
61 | static bool call_graph = false; |
62 | static bool inherit_stat = false; |
63 | static bool no_samples = false; |
64 | static bool sample_address = false; |
65 | static bool sample_time = false; |
66 | static bool no_buildid = false; |
67 | static bool no_buildid_cache = false; |
68 | static struct perf_evlist *evsel_list; |
69 | |
70 | static long samples = 0; |
71 | static u64 bytes_written = 0; |
72 | |
73 | static int file_new = 1; |
74 | static off_t post_processing_offset; |
75 | |
76 | static struct perf_session *session; |
77 | static const char *cpu_list; |
78 | |
79 | static void advance_output(size_t size) |
80 | { |
81 | bytes_written += size; |
82 | } |
83 | |
84 | static void write_output(void *buf, size_t size) |
85 | { |
86 | while (size) { |
87 | int ret = write(output, buf, size); |
88 | |
89 | if (ret < 0) |
90 | die("failed to write"); |
91 | |
92 | size -= ret; |
93 | buf += ret; |
94 | |
95 | bytes_written += ret; |
96 | } |
97 | } |
98 | |
99 | static int process_synthesized_event(union perf_event *event, |
100 | struct perf_sample *sample __used, |
101 | struct perf_session *self __used) |
102 | { |
103 | write_output(event, event->header.size); |
104 | return 0; |
105 | } |
106 | |
107 | static void mmap_read(struct perf_mmap *md) |
108 | { |
109 | unsigned int head = perf_mmap__read_head(md); |
110 | unsigned int old = md->prev; |
111 | unsigned char *data = md->base + page_size; |
112 | unsigned long size; |
113 | void *buf; |
114 | |
115 | if (old == head) |
116 | return; |
117 | |
118 | samples++; |
119 | |
120 | size = head - old; |
121 | |
122 | if ((old & md->mask) + size != (head & md->mask)) { |
123 | buf = &data[old & md->mask]; |
124 | size = md->mask + 1 - (old & md->mask); |
125 | old += size; |
126 | |
127 | write_output(buf, size); |
128 | } |
129 | |
130 | buf = &data[old & md->mask]; |
131 | size = head - old; |
132 | old += size; |
133 | |
134 | write_output(buf, size); |
135 | |
136 | md->prev = old; |
137 | perf_mmap__write_tail(md, old); |
138 | } |
139 | |
140 | static volatile int done = 0; |
141 | static volatile int signr = -1; |
142 | |
143 | static void sig_handler(int sig) |
144 | { |
145 | done = 1; |
146 | signr = sig; |
147 | } |
148 | |
149 | static void sig_atexit(void) |
150 | { |
151 | if (child_pid > 0) |
152 | kill(child_pid, SIGTERM); |
153 | |
154 | if (signr == -1 || signr == SIGUSR1) |
155 | return; |
156 | |
157 | signal(signr, SIG_DFL); |
158 | kill(getpid(), signr); |
159 | } |
160 | |
161 | static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist) |
162 | { |
163 | struct perf_event_attr *attr = &evsel->attr; |
164 | int track = !evsel->idx; /* only the first counter needs these */ |
165 | |
166 | attr->inherit = !no_inherit; |
167 | attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | |
168 | PERF_FORMAT_TOTAL_TIME_RUNNING | |
169 | PERF_FORMAT_ID; |
170 | |
171 | attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID; |
172 | |
173 | if (evlist->nr_entries > 1) |
174 | attr->sample_type |= PERF_SAMPLE_ID; |
175 | |
176 | /* |
177 | * We default some events to a 1 default interval. But keep |
178 | * it a weak assumption overridable by the user. |
179 | */ |
180 | if (!attr->sample_period || (user_freq != UINT_MAX && |
181 | user_interval != ULLONG_MAX)) { |
182 | if (freq) { |
183 | attr->sample_type |= PERF_SAMPLE_PERIOD; |
184 | attr->freq = 1; |
185 | attr->sample_freq = freq; |
186 | } else { |
187 | attr->sample_period = default_interval; |
188 | } |
189 | } |
190 | |
191 | if (no_samples) |
192 | attr->sample_freq = 0; |
193 | |
194 | if (inherit_stat) |
195 | attr->inherit_stat = 1; |
196 | |
197 | if (sample_address) { |
198 | attr->sample_type |= PERF_SAMPLE_ADDR; |
199 | attr->mmap_data = track; |
200 | } |
201 | |
202 | if (call_graph) |
203 | attr->sample_type |= PERF_SAMPLE_CALLCHAIN; |
204 | |
205 | if (system_wide) |
206 | attr->sample_type |= PERF_SAMPLE_CPU; |
207 | |
208 | if (sample_id_all_avail && |
209 | (sample_time || system_wide || !no_inherit || cpu_list)) |
210 | attr->sample_type |= PERF_SAMPLE_TIME; |
211 | |
212 | if (raw_samples) { |
213 | attr->sample_type |= PERF_SAMPLE_TIME; |
214 | attr->sample_type |= PERF_SAMPLE_RAW; |
215 | attr->sample_type |= PERF_SAMPLE_CPU; |
216 | } |
217 | |
218 | if (nodelay) { |
219 | attr->watermark = 0; |
220 | attr->wakeup_events = 1; |
221 | } |
222 | |
223 | attr->mmap = track; |
224 | attr->comm = track; |
225 | |
226 | if (target_pid == -1 && target_tid == -1 && !system_wide) { |
227 | attr->disabled = 1; |
228 | attr->enable_on_exec = 1; |
229 | } |
230 | } |
231 | |
232 | static bool perf_evlist__equal(struct perf_evlist *evlist, |
233 | struct perf_evlist *other) |
234 | { |
235 | struct perf_evsel *pos, *pair; |
236 | |
237 | if (evlist->nr_entries != other->nr_entries) |
238 | return false; |
239 | |
240 | pair = list_entry(other->entries.next, struct perf_evsel, node); |
241 | |
242 | list_for_each_entry(pos, &evlist->entries, node) { |
243 | if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0)) |
244 | return false; |
245 | pair = list_entry(pair->node.next, struct perf_evsel, node); |
246 | } |
247 | |
248 | return true; |
249 | } |
250 | |
251 | static void open_counters(struct perf_evlist *evlist) |
252 | { |
253 | struct perf_evsel *pos; |
254 | |
255 | if (evlist->cpus->map[0] < 0) |
256 | no_inherit = true; |
257 | |
258 | list_for_each_entry(pos, &evlist->entries, node) { |
259 | struct perf_event_attr *attr = &pos->attr; |
260 | /* |
261 | * Check if parse_single_tracepoint_event has already asked for |
262 | * PERF_SAMPLE_TIME. |
263 | * |
264 | * XXX this is kludgy but short term fix for problems introduced by |
265 | * eac23d1c that broke 'perf script' by having different sample_types |
266 | * when using multiple tracepoint events when we use a perf binary |
267 | * that tries to use sample_id_all on an older kernel. |
268 | * |
269 | * We need to move counter creation to perf_session, support |
270 | * different sample_types, etc. |
271 | */ |
272 | bool time_needed = attr->sample_type & PERF_SAMPLE_TIME; |
273 | |
274 | config_attr(pos, evlist); |
275 | retry_sample_id: |
276 | attr->sample_id_all = sample_id_all_avail ? 1 : 0; |
277 | try_again: |
278 | if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group) < 0) { |
279 | int err = errno; |
280 | |
281 | if (err == EPERM || err == EACCES) { |
282 | ui__warning_paranoid(); |
283 | exit(EXIT_FAILURE); |
284 | } else if (err == ENODEV && cpu_list) { |
285 | die("No such device - did you specify" |
286 | " an out-of-range profile CPU?\n"); |
287 | } else if (err == EINVAL && sample_id_all_avail) { |
288 | /* |
289 | * Old kernel, no attr->sample_id_type_all field |
290 | */ |
291 | sample_id_all_avail = false; |
292 | if (!sample_time && !raw_samples && !time_needed) |
293 | attr->sample_type &= ~PERF_SAMPLE_TIME; |
294 | |
295 | goto retry_sample_id; |
296 | } |
297 | |
298 | /* |
299 | * If it's cycles then fall back to hrtimer |
300 | * based cpu-clock-tick sw counter, which |
301 | * is always available even if no PMU support: |
302 | */ |
303 | if (attr->type == PERF_TYPE_HARDWARE |
304 | && attr->config == PERF_COUNT_HW_CPU_CYCLES) { |
305 | |
306 | if (verbose) |
307 | ui__warning("The cycles event is not supported, " |
308 | "trying to fall back to cpu-clock-ticks\n"); |
309 | attr->type = PERF_TYPE_SOFTWARE; |
310 | attr->config = PERF_COUNT_SW_CPU_CLOCK; |
311 | goto try_again; |
312 | } |
313 | |
314 | if (err == ENOENT) { |
315 | ui__warning("The %s event is not supported.\n", |
316 | event_name(pos)); |
317 | exit(EXIT_FAILURE); |
318 | } |
319 | |
320 | printf("\n"); |
321 | error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", |
322 | err, strerror(err)); |
323 | |
324 | #if defined(__i386__) || defined(__x86_64__) |
325 | if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP) |
326 | die("No hardware sampling interrupt available." |
327 | " No APIC? If so then you can boot the kernel" |
328 | " with the \"lapic\" boot parameter to" |
329 | " force-enable it.\n"); |
330 | #endif |
331 | |
332 | die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); |
333 | } |
334 | } |
335 | |
336 | if (perf_evlist__set_filters(evlist)) { |
337 | error("failed to set filter with %d (%s)\n", errno, |
338 | strerror(errno)); |
339 | exit(-1); |
340 | } |
341 | |
342 | if (perf_evlist__mmap(evlist, mmap_pages, false) < 0) |
343 | die("failed to mmap with %d (%s)\n", errno, strerror(errno)); |
344 | |
345 | if (file_new) |
346 | session->evlist = evlist; |
347 | else { |
348 | if (!perf_evlist__equal(session->evlist, evlist)) { |
349 | fprintf(stderr, "incompatible append\n"); |
350 | exit(-1); |
351 | } |
352 | } |
353 | |
354 | perf_session__update_sample_type(session); |
355 | } |
356 | |
357 | static int process_buildids(void) |
358 | { |
359 | u64 size = lseek(output, 0, SEEK_CUR); |
360 | |
361 | if (size == 0) |
362 | return 0; |
363 | |
364 | session->fd = output; |
365 | return __perf_session__process_events(session, post_processing_offset, |
366 | size - post_processing_offset, |
367 | size, &build_id__mark_dso_hit_ops); |
368 | } |
369 | |
370 | static void atexit_header(void) |
371 | { |
372 | if (!pipe_output) { |
373 | session->header.data_size += bytes_written; |
374 | |
375 | if (!no_buildid) |
376 | process_buildids(); |
377 | perf_session__write_header(session, evsel_list, output, true); |
378 | perf_session__delete(session); |
379 | perf_evlist__delete(evsel_list); |
380 | symbol__exit(); |
381 | } |
382 | } |
383 | |
384 | static void perf_event__synthesize_guest_os(struct machine *machine, void *data) |
385 | { |
386 | int err; |
387 | struct perf_session *psession = data; |
388 | |
389 | if (machine__is_host(machine)) |
390 | return; |
391 | |
392 | /* |
393 | *As for guest kernel when processing subcommand record&report, |
394 | *we arrange module mmap prior to guest kernel mmap and trigger |
395 | *a preload dso because default guest module symbols are loaded |
396 | *from guest kallsyms instead of /lib/modules/XXX/XXX. This |
397 | *method is used to avoid symbol missing when the first addr is |
398 | *in module instead of in guest kernel. |
399 | */ |
400 | err = perf_event__synthesize_modules(process_synthesized_event, |
401 | psession, machine); |
402 | if (err < 0) |
403 | pr_err("Couldn't record guest kernel [%d]'s reference" |
404 | " relocation symbol.\n", machine->pid); |
405 | |
406 | /* |
407 | * We use _stext for guest kernel because guest kernel's /proc/kallsyms |
408 | * have no _text sometimes. |
409 | */ |
410 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
411 | psession, machine, "_text"); |
412 | if (err < 0) |
413 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
414 | psession, machine, |
415 | "_stext"); |
416 | if (err < 0) |
417 | pr_err("Couldn't record guest kernel [%d]'s reference" |
418 | " relocation symbol.\n", machine->pid); |
419 | } |
420 | |
421 | static struct perf_event_header finished_round_event = { |
422 | .size = sizeof(struct perf_event_header), |
423 | .type = PERF_RECORD_FINISHED_ROUND, |
424 | }; |
425 | |
426 | static void mmap_read_all(void) |
427 | { |
428 | int i; |
429 | |
430 | for (i = 0; i < evsel_list->nr_mmaps; i++) { |
431 | if (evsel_list->mmap[i].base) |
432 | mmap_read(&evsel_list->mmap[i]); |
433 | } |
434 | |
435 | if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO)) |
436 | write_output(&finished_round_event, sizeof(finished_round_event)); |
437 | } |
438 | |
439 | static int __cmd_record(int argc, const char **argv) |
440 | { |
441 | int i; |
442 | struct stat st; |
443 | int flags; |
444 | int err; |
445 | unsigned long waking = 0; |
446 | int child_ready_pipe[2], go_pipe[2]; |
447 | const bool forks = argc > 0; |
448 | char buf; |
449 | struct machine *machine; |
450 | |
451 | page_size = sysconf(_SC_PAGE_SIZE); |
452 | |
453 | atexit(sig_atexit); |
454 | signal(SIGCHLD, sig_handler); |
455 | signal(SIGINT, sig_handler); |
456 | signal(SIGUSR1, sig_handler); |
457 | |
458 | if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) { |
459 | perror("failed to create pipes"); |
460 | exit(-1); |
461 | } |
462 | |
463 | if (!output_name) { |
464 | if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode)) |
465 | pipe_output = 1; |
466 | else |
467 | output_name = "perf.data"; |
468 | } |
469 | if (output_name) { |
470 | if (!strcmp(output_name, "-")) |
471 | pipe_output = 1; |
472 | else if (!stat(output_name, &st) && st.st_size) { |
473 | if (write_mode == WRITE_FORCE) { |
474 | char oldname[PATH_MAX]; |
475 | snprintf(oldname, sizeof(oldname), "%s.old", |
476 | output_name); |
477 | unlink(oldname); |
478 | rename(output_name, oldname); |
479 | } |
480 | } else if (write_mode == WRITE_APPEND) { |
481 | write_mode = WRITE_FORCE; |
482 | } |
483 | } |
484 | |
485 | flags = O_CREAT|O_RDWR; |
486 | if (write_mode == WRITE_APPEND) |
487 | file_new = 0; |
488 | else |
489 | flags |= O_TRUNC; |
490 | |
491 | if (pipe_output) |
492 | output = STDOUT_FILENO; |
493 | else |
494 | output = open(output_name, flags, S_IRUSR | S_IWUSR); |
495 | if (output < 0) { |
496 | perror("failed to create output file"); |
497 | exit(-1); |
498 | } |
499 | |
500 | session = perf_session__new(output_name, O_WRONLY, |
501 | write_mode == WRITE_FORCE, false, NULL); |
502 | if (session == NULL) { |
503 | pr_err("Not enough memory for reading perf file header\n"); |
504 | return -1; |
505 | } |
506 | |
507 | if (!no_buildid) |
508 | perf_header__set_feat(&session->header, HEADER_BUILD_ID); |
509 | |
510 | if (!file_new) { |
511 | err = perf_session__read_header(session, output); |
512 | if (err < 0) |
513 | goto out_delete_session; |
514 | } |
515 | |
516 | if (have_tracepoints(&evsel_list->entries)) |
517 | perf_header__set_feat(&session->header, HEADER_TRACE_INFO); |
518 | |
519 | /* 512 kiB: default amount of unprivileged mlocked memory */ |
520 | if (mmap_pages == UINT_MAX) |
521 | mmap_pages = (512 * 1024) / page_size; |
522 | |
523 | if (forks) { |
524 | child_pid = fork(); |
525 | if (child_pid < 0) { |
526 | perror("failed to fork"); |
527 | exit(-1); |
528 | } |
529 | |
530 | if (!child_pid) { |
531 | if (pipe_output) |
532 | dup2(2, 1); |
533 | close(child_ready_pipe[0]); |
534 | close(go_pipe[1]); |
535 | fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); |
536 | |
537 | /* |
538 | * Do a dummy execvp to get the PLT entry resolved, |
539 | * so we avoid the resolver overhead on the real |
540 | * execvp call. |
541 | */ |
542 | execvp("", (char **)argv); |
543 | |
544 | /* |
545 | * Tell the parent we're ready to go |
546 | */ |
547 | close(child_ready_pipe[1]); |
548 | |
549 | /* |
550 | * Wait until the parent tells us to go. |
551 | */ |
552 | if (read(go_pipe[0], &buf, 1) == -1) |
553 | perror("unable to read pipe"); |
554 | |
555 | execvp(argv[0], (char **)argv); |
556 | |
557 | perror(argv[0]); |
558 | kill(getppid(), SIGUSR1); |
559 | exit(-1); |
560 | } |
561 | |
562 | if (!system_wide && target_tid == -1 && target_pid == -1) |
563 | evsel_list->threads->map[0] = child_pid; |
564 | |
565 | close(child_ready_pipe[1]); |
566 | close(go_pipe[0]); |
567 | /* |
568 | * wait for child to settle |
569 | */ |
570 | if (read(child_ready_pipe[0], &buf, 1) == -1) { |
571 | perror("unable to read pipe"); |
572 | exit(-1); |
573 | } |
574 | close(child_ready_pipe[0]); |
575 | } |
576 | |
577 | open_counters(evsel_list); |
578 | |
579 | /* |
580 | * perf_session__delete(session) will be called at atexit_header() |
581 | */ |
582 | atexit(atexit_header); |
583 | |
584 | if (pipe_output) { |
585 | err = perf_header__write_pipe(output); |
586 | if (err < 0) |
587 | return err; |
588 | } else if (file_new) { |
589 | err = perf_session__write_header(session, evsel_list, |
590 | output, false); |
591 | if (err < 0) |
592 | return err; |
593 | } |
594 | |
595 | post_processing_offset = lseek(output, 0, SEEK_CUR); |
596 | |
597 | if (pipe_output) { |
598 | err = perf_session__synthesize_attrs(session, |
599 | process_synthesized_event); |
600 | if (err < 0) { |
601 | pr_err("Couldn't synthesize attrs.\n"); |
602 | return err; |
603 | } |
604 | |
605 | err = perf_event__synthesize_event_types(process_synthesized_event, |
606 | session); |
607 | if (err < 0) { |
608 | pr_err("Couldn't synthesize event_types.\n"); |
609 | return err; |
610 | } |
611 | |
612 | if (have_tracepoints(&evsel_list->entries)) { |
613 | /* |
614 | * FIXME err <= 0 here actually means that |
615 | * there were no tracepoints so its not really |
616 | * an error, just that we don't need to |
617 | * synthesize anything. We really have to |
618 | * return this more properly and also |
619 | * propagate errors that now are calling die() |
620 | */ |
621 | err = perf_event__synthesize_tracing_data(output, evsel_list, |
622 | process_synthesized_event, |
623 | session); |
624 | if (err <= 0) { |
625 | pr_err("Couldn't record tracing data.\n"); |
626 | return err; |
627 | } |
628 | advance_output(err); |
629 | } |
630 | } |
631 | |
632 | machine = perf_session__find_host_machine(session); |
633 | if (!machine) { |
634 | pr_err("Couldn't find native kernel information.\n"); |
635 | return -1; |
636 | } |
637 | |
638 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
639 | session, machine, "_text"); |
640 | if (err < 0) |
641 | err = perf_event__synthesize_kernel_mmap(process_synthesized_event, |
642 | session, machine, "_stext"); |
643 | if (err < 0) |
644 | pr_err("Couldn't record kernel reference relocation symbol\n" |
645 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
646 | "Check /proc/kallsyms permission or run as root.\n"); |
647 | |
648 | err = perf_event__synthesize_modules(process_synthesized_event, |
649 | session, machine); |
650 | if (err < 0) |
651 | pr_err("Couldn't record kernel module information.\n" |
652 | "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n" |
653 | "Check /proc/modules permission or run as root.\n"); |
654 | |
655 | if (perf_guest) |
656 | perf_session__process_machines(session, |
657 | perf_event__synthesize_guest_os); |
658 | |
659 | if (!system_wide) |
660 | perf_event__synthesize_thread_map(evsel_list->threads, |
661 | process_synthesized_event, |
662 | session); |
663 | else |
664 | perf_event__synthesize_threads(process_synthesized_event, |
665 | session); |
666 | |
667 | if (realtime_prio) { |
668 | struct sched_param param; |
669 | |
670 | param.sched_priority = realtime_prio; |
671 | if (sched_setscheduler(0, SCHED_FIFO, ¶m)) { |
672 | pr_err("Could not set realtime priority.\n"); |
673 | exit(-1); |
674 | } |
675 | } |
676 | |
677 | /* |
678 | * Let the child rip |
679 | */ |
680 | if (forks) |
681 | close(go_pipe[1]); |
682 | |
683 | for (;;) { |
684 | int hits = samples; |
685 | int thread; |
686 | |
687 | mmap_read_all(); |
688 | |
689 | if (hits == samples) { |
690 | if (done) |
691 | break; |
692 | err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1); |
693 | waking++; |
694 | } |
695 | |
696 | if (done) { |
697 | for (i = 0; i < evsel_list->cpus->nr; i++) { |
698 | struct perf_evsel *pos; |
699 | |
700 | list_for_each_entry(pos, &evsel_list->entries, node) { |
701 | for (thread = 0; |
702 | thread < evsel_list->threads->nr; |
703 | thread++) |
704 | ioctl(FD(pos, i, thread), |
705 | PERF_EVENT_IOC_DISABLE); |
706 | } |
707 | } |
708 | } |
709 | } |
710 | |
711 | if (quiet || signr == SIGUSR1) |
712 | return 0; |
713 | |
714 | fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking); |
715 | |
716 | /* |
717 | * Approximate RIP event size: 24 bytes. |
718 | */ |
719 | fprintf(stderr, |
720 | "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n", |
721 | (double)bytes_written / 1024.0 / 1024.0, |
722 | output_name, |
723 | bytes_written / 24); |
724 | |
725 | return 0; |
726 | |
727 | out_delete_session: |
728 | perf_session__delete(session); |
729 | return err; |
730 | } |
731 | |
732 | static const char * const record_usage[] = { |
733 | "perf record [<options>] [<command>]", |
734 | "perf record [<options>] -- <command> [<options>]", |
735 | NULL |
736 | }; |
737 | |
738 | static bool force, append_file; |
739 | |
740 | const struct option record_options[] = { |
741 | OPT_CALLBACK('e', "event", &evsel_list, "event", |
742 | "event selector. use 'perf list' to list available events", |
743 | parse_events), |
744 | OPT_CALLBACK(0, "filter", &evsel_list, "filter", |
745 | "event filter", parse_filter), |
746 | OPT_INTEGER('p', "pid", &target_pid, |
747 | "record events on existing process id"), |
748 | OPT_INTEGER('t', "tid", &target_tid, |
749 | "record events on existing thread id"), |
750 | OPT_INTEGER('r', "realtime", &realtime_prio, |
751 | "collect data with this RT SCHED_FIFO priority"), |
752 | OPT_BOOLEAN('D', "no-delay", &nodelay, |
753 | "collect data without buffering"), |
754 | OPT_BOOLEAN('R', "raw-samples", &raw_samples, |
755 | "collect raw sample records from all opened counters"), |
756 | OPT_BOOLEAN('a', "all-cpus", &system_wide, |
757 | "system-wide collection from all CPUs"), |
758 | OPT_BOOLEAN('A', "append", &append_file, |
759 | "append to the output file to do incremental profiling"), |
760 | OPT_STRING('C', "cpu", &cpu_list, "cpu", |
761 | "list of cpus to monitor"), |
762 | OPT_BOOLEAN('f', "force", &force, |
763 | "overwrite existing data file (deprecated)"), |
764 | OPT_U64('c', "count", &user_interval, "event period to sample"), |
765 | OPT_STRING('o', "output", &output_name, "file", |
766 | "output file name"), |
767 | OPT_BOOLEAN('i', "no-inherit", &no_inherit, |
768 | "child tasks do not inherit counters"), |
769 | OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"), |
770 | OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), |
771 | OPT_BOOLEAN('g', "call-graph", &call_graph, |
772 | "do call-graph (stack chain/backtrace) recording"), |
773 | OPT_INCR('v', "verbose", &verbose, |
774 | "be more verbose (show counter open errors, etc)"), |
775 | OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"), |
776 | OPT_BOOLEAN('s', "stat", &inherit_stat, |
777 | "per thread counts"), |
778 | OPT_BOOLEAN('d', "data", &sample_address, |
779 | "Sample addresses"), |
780 | OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"), |
781 | OPT_BOOLEAN('n', "no-samples", &no_samples, |
782 | "don't sample"), |
783 | OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache, |
784 | "do not update the buildid cache"), |
785 | OPT_BOOLEAN('B', "no-buildid", &no_buildid, |
786 | "do not collect buildids in perf.data"), |
787 | OPT_CALLBACK('G', "cgroup", &evsel_list, "name", |
788 | "monitor event in cgroup name only", |
789 | parse_cgroups), |
790 | OPT_END() |
791 | }; |
792 | |
793 | int cmd_record(int argc, const char **argv, const char *prefix __used) |
794 | { |
795 | int err = -ENOMEM; |
796 | struct perf_evsel *pos; |
797 | |
798 | evsel_list = perf_evlist__new(NULL, NULL); |
799 | if (evsel_list == NULL) |
800 | return -ENOMEM; |
801 | |
802 | argc = parse_options(argc, argv, record_options, record_usage, |
803 | PARSE_OPT_STOP_AT_NON_OPTION); |
804 | if (!argc && target_pid == -1 && target_tid == -1 && |
805 | !system_wide && !cpu_list) |
806 | usage_with_options(record_usage, record_options); |
807 | |
808 | if (force && append_file) { |
809 | fprintf(stderr, "Can't overwrite and append at the same time." |
810 | " You need to choose between -f and -A"); |
811 | usage_with_options(record_usage, record_options); |
812 | } else if (append_file) { |
813 | write_mode = WRITE_APPEND; |
814 | } else { |
815 | write_mode = WRITE_FORCE; |
816 | } |
817 | |
818 | if (nr_cgroups && !system_wide) { |
819 | fprintf(stderr, "cgroup monitoring only available in" |
820 | " system-wide mode\n"); |
821 | usage_with_options(record_usage, record_options); |
822 | } |
823 | |
824 | symbol__init(); |
825 | |
826 | if (no_buildid_cache || no_buildid) |
827 | disable_buildid_cache(); |
828 | |
829 | if (evsel_list->nr_entries == 0 && |
830 | perf_evlist__add_default(evsel_list) < 0) { |
831 | pr_err("Not enough memory for event selector list\n"); |
832 | goto out_symbol_exit; |
833 | } |
834 | |
835 | if (target_pid != -1) |
836 | target_tid = target_pid; |
837 | |
838 | if (perf_evlist__create_maps(evsel_list, target_pid, |
839 | target_tid, cpu_list) < 0) |
840 | usage_with_options(record_usage, record_options); |
841 | |
842 | list_for_each_entry(pos, &evsel_list->entries, node) { |
843 | if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, |
844 | evsel_list->threads->nr) < 0) |
845 | goto out_free_fd; |
846 | if (perf_header__push_event(pos->attr.config, event_name(pos))) |
847 | goto out_free_fd; |
848 | } |
849 | |
850 | if (perf_evlist__alloc_pollfd(evsel_list) < 0) |
851 | goto out_free_fd; |
852 | |
853 | if (user_interval != ULLONG_MAX) |
854 | default_interval = user_interval; |
855 | if (user_freq != UINT_MAX) |
856 | freq = user_freq; |
857 | |
858 | /* |
859 | * User specified count overrides default frequency. |
860 | */ |
861 | if (default_interval) |
862 | freq = 0; |
863 | else if (freq) { |
864 | default_interval = freq; |
865 | } else { |
866 | fprintf(stderr, "frequency and count are zero, aborting\n"); |
867 | err = -EINVAL; |
868 | goto out_free_fd; |
869 | } |
870 | |
871 | err = __cmd_record(argc, argv); |
872 | out_free_fd: |
873 | perf_evlist__delete_maps(evsel_list); |
874 | out_symbol_exit: |
875 | symbol__exit(); |
876 | return err; |
877 | } |
878 |
Branches:
ben-wpan
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javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9