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Staging: merge 2.6.39-rc4 into staging-next
[zen-stable.git] / tools / perf / builtin-record.c
blob17d1dcb3c66771cb1d7603cff6a5ed981d44ca69
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->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
167 PERF_FORMAT_TOTAL_TIME_RUNNING |
168 PERF_FORMAT_ID;
169
170 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
171
172 if (evlist->nr_entries > 1)
173 attr->sample_type |= PERF_SAMPLE_ID;
174
175 /*
176 * We default some events to a 1 default interval. But keep
177 * it a weak assumption overridable by the user.
178 */
179 if (!attr->sample_period || (user_freq != UINT_MAX &&
180 user_interval != ULLONG_MAX)) {
181 if (freq) {
182 attr->sample_type |= PERF_SAMPLE_PERIOD;
183 attr->freq = 1;
184 attr->sample_freq = freq;
185 } else {
186 attr->sample_period = default_interval;
187 }
188 }
189
190 if (no_samples)
191 attr->sample_freq = 0;
192
193 if (inherit_stat)
194 attr->inherit_stat = 1;
195
196 if (sample_address) {
197 attr->sample_type |= PERF_SAMPLE_ADDR;
198 attr->mmap_data = track;
199 }
200
201 if (call_graph)
202 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
203
204 if (system_wide)
205 attr->sample_type |= PERF_SAMPLE_CPU;
206
207 if (sample_id_all_avail &&
208 (sample_time || system_wide || !no_inherit || cpu_list))
209 attr->sample_type |= PERF_SAMPLE_TIME;
210
211 if (raw_samples) {
212 attr->sample_type |= PERF_SAMPLE_TIME;
213 attr->sample_type |= PERF_SAMPLE_RAW;
214 attr->sample_type |= PERF_SAMPLE_CPU;
215 }
216
217 if (nodelay) {
218 attr->watermark = 0;
219 attr->wakeup_events = 1;
220 }
221
222 attr->mmap = track;
223 attr->comm = track;
224
225 if (target_pid == -1 && target_tid == -1 && !system_wide) {
226 attr->disabled = 1;
227 attr->enable_on_exec = 1;
228 }
229 }
230
231 static bool perf_evlist__equal(struct perf_evlist *evlist,
232 struct perf_evlist *other)
233 {
234 struct perf_evsel *pos, *pair;
235
236 if (evlist->nr_entries != other->nr_entries)
237 return false;
238
239 pair = list_entry(other->entries.next, struct perf_evsel, node);
240
241 list_for_each_entry(pos, &evlist->entries, node) {
242 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
243 return false;
244 pair = list_entry(pair->node.next, struct perf_evsel, node);
245 }
246
247 return true;
248 }
249
250 static void open_counters(struct perf_evlist *evlist)
251 {
252 struct perf_evsel *pos;
253
254 list_for_each_entry(pos, &evlist->entries, node) {
255 struct perf_event_attr *attr = &pos->attr;
256 /*
257 * Check if parse_single_tracepoint_event has already asked for
258 * PERF_SAMPLE_TIME.
259 *
260 * XXX this is kludgy but short term fix for problems introduced by
261 * eac23d1c that broke 'perf script' by having different sample_types
262 * when using multiple tracepoint events when we use a perf binary
263 * that tries to use sample_id_all on an older kernel.
264 *
265 * We need to move counter creation to perf_session, support
266 * different sample_types, etc.
267 */
268 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
269
270 config_attr(pos, evlist);
271 retry_sample_id:
272 attr->sample_id_all = sample_id_all_avail ? 1 : 0;
273 try_again:
274 if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group,
275 !no_inherit) < 0) {
276 int err = errno;
277
278 if (err == EPERM || err == EACCES) {
279 ui__warning_paranoid();
280 exit(EXIT_FAILURE);
281 } else if (err == ENODEV && cpu_list) {
282 die("No such device - did you specify"
283 " an out-of-range profile CPU?\n");
284 } else if (err == EINVAL && sample_id_all_avail) {
285 /*
286 * Old kernel, no attr->sample_id_type_all field
287 */
288 sample_id_all_avail = false;
289 if (!sample_time && !raw_samples && !time_needed)
290 attr->sample_type &= ~PERF_SAMPLE_TIME;
291
292 goto retry_sample_id;
293 }
294
295 /*
296 * If it's cycles then fall back to hrtimer
297 * based cpu-clock-tick sw counter, which
298 * is always available even if no PMU support:
299 */
300 if (attr->type == PERF_TYPE_HARDWARE
301 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
302
303 if (verbose)
304 ui__warning("The cycles event is not supported, "
305 "trying to fall back to cpu-clock-ticks\n");
306 attr->type = PERF_TYPE_SOFTWARE;
307 attr->config = PERF_COUNT_SW_CPU_CLOCK;
308 goto try_again;
309 }
310
311 if (err == ENOENT) {
312 ui__warning("The %s event is not supported.\n",
313 event_name(pos));
314 exit(EXIT_FAILURE);
315 }
316
317 printf("\n");
318 error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
319 err, strerror(err));
320
321 #if defined(__i386__) || defined(__x86_64__)
322 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
323 die("No hardware sampling interrupt available."
324 " No APIC? If so then you can boot the kernel"
325 " with the \"lapic\" boot parameter to"
326 " force-enable it.\n");
327 #endif
328
329 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
330 }
331 }
332
333 if (perf_evlist__set_filters(evlist)) {
334 error("failed to set filter with %d (%s)\n", errno,
335 strerror(errno));
336 exit(-1);
337 }
338
339 if (perf_evlist__mmap(evlist, mmap_pages, false) < 0)
340 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
341
342 if (file_new)
343 session->evlist = evlist;
344 else {
345 if (!perf_evlist__equal(session->evlist, evlist)) {
346 fprintf(stderr, "incompatible append\n");
347 exit(-1);
348 }
349 }
350
351 perf_session__update_sample_type(session);
352 }
353
354 static int process_buildids(void)
355 {
356 u64 size = lseek(output, 0, SEEK_CUR);
357
358 if (size == 0)
359 return 0;
360
361 session->fd = output;
362 return __perf_session__process_events(session, post_processing_offset,
363 size - post_processing_offset,
364 size, &build_id__mark_dso_hit_ops);
365 }
366
367 static void atexit_header(void)
368 {
369 if (!pipe_output) {
370 session->header.data_size += bytes_written;
371
372 if (!no_buildid)
373 process_buildids();
374 perf_session__write_header(session, evsel_list, output, true);
375 perf_session__delete(session);
376 perf_evlist__delete(evsel_list);
377 symbol__exit();
378 }
379 }
380
381 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
382 {
383 int err;
384 struct perf_session *psession = data;
385
386 if (machine__is_host(machine))
387 return;
388
389 /*
390 *As for guest kernel when processing subcommand record&report,
391 *we arrange module mmap prior to guest kernel mmap and trigger
392 *a preload dso because default guest module symbols are loaded
393 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
394 *method is used to avoid symbol missing when the first addr is
395 *in module instead of in guest kernel.
396 */
397 err = perf_event__synthesize_modules(process_synthesized_event,
398 psession, machine);
399 if (err < 0)
400 pr_err("Couldn't record guest kernel [%d]'s reference"
401 " relocation symbol.\n", machine->pid);
402
403 /*
404 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
405 * have no _text sometimes.
406 */
407 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
408 psession, machine, "_text");
409 if (err < 0)
410 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
411 psession, machine,
412 "_stext");
413 if (err < 0)
414 pr_err("Couldn't record guest kernel [%d]'s reference"
415 " relocation symbol.\n", machine->pid);
416 }
417
418 static struct perf_event_header finished_round_event = {
419 .size = sizeof(struct perf_event_header),
420 .type = PERF_RECORD_FINISHED_ROUND,
421 };
422
423 static void mmap_read_all(void)
424 {
425 int i;
426
427 for (i = 0; i < evsel_list->cpus->nr; i++) {
428 if (evsel_list->mmap[i].base)
429 mmap_read(&evsel_list->mmap[i]);
430 }
431
432 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
433 write_output(&finished_round_event, sizeof(finished_round_event));
434 }
435
436 static int __cmd_record(int argc, const char **argv)
437 {
438 int i;
439 struct stat st;
440 int flags;
441 int err;
442 unsigned long waking = 0;
443 int child_ready_pipe[2], go_pipe[2];
444 const bool forks = argc > 0;
445 char buf;
446 struct machine *machine;
447
448 page_size = sysconf(_SC_PAGE_SIZE);
449
450 atexit(sig_atexit);
451 signal(SIGCHLD, sig_handler);
452 signal(SIGINT, sig_handler);
453 signal(SIGUSR1, sig_handler);
454
455 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
456 perror("failed to create pipes");
457 exit(-1);
458 }
459
460 if (!output_name) {
461 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
462 pipe_output = 1;
463 else
464 output_name = "perf.data";
465 }
466 if (output_name) {
467 if (!strcmp(output_name, "-"))
468 pipe_output = 1;
469 else if (!stat(output_name, &st) && st.st_size) {
470 if (write_mode == WRITE_FORCE) {
471 char oldname[PATH_MAX];
472 snprintf(oldname, sizeof(oldname), "%s.old",
473 output_name);
474 unlink(oldname);
475 rename(output_name, oldname);
476 }
477 } else if (write_mode == WRITE_APPEND) {
478 write_mode = WRITE_FORCE;
479 }
480 }
481
482 flags = O_CREAT|O_RDWR;
483 if (write_mode == WRITE_APPEND)
484 file_new = 0;
485 else
486 flags |= O_TRUNC;
487
488 if (pipe_output)
489 output = STDOUT_FILENO;
490 else
491 output = open(output_name, flags, S_IRUSR | S_IWUSR);
492 if (output < 0) {
493 perror("failed to create output file");
494 exit(-1);
495 }
496
497 session = perf_session__new(output_name, O_WRONLY,
498 write_mode == WRITE_FORCE, false, NULL);
499 if (session == NULL) {
500 pr_err("Not enough memory for reading perf file header\n");
501 return -1;
502 }
503
504 if (!no_buildid)
505 perf_header__set_feat(&session->header, HEADER_BUILD_ID);
506
507 if (!file_new) {
508 err = perf_session__read_header(session, output);
509 if (err < 0)
510 goto out_delete_session;
511 }
512
513 if (have_tracepoints(&evsel_list->entries))
514 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
515
516 /* 512 kiB: default amount of unprivileged mlocked memory */
517 if (mmap_pages == UINT_MAX)
518 mmap_pages = (512 * 1024) / page_size;
519
520 if (forks) {
521 child_pid = fork();
522 if (child_pid < 0) {
523 perror("failed to fork");
524 exit(-1);
525 }
526
527 if (!child_pid) {
528 if (pipe_output)
529 dup2(2, 1);
530 close(child_ready_pipe[0]);
531 close(go_pipe[1]);
532 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
533
534 /*
535 * Do a dummy execvp to get the PLT entry resolved,
536 * so we avoid the resolver overhead on the real
537 * execvp call.
538 */
539 execvp("", (char **)argv);
540
541 /*
542 * Tell the parent we're ready to go
543 */
544 close(child_ready_pipe[1]);
545
546 /*
547 * Wait until the parent tells us to go.
548 */
549 if (read(go_pipe[0], &buf, 1) == -1)
550 perror("unable to read pipe");
551
552 execvp(argv[0], (char **)argv);
553
554 perror(argv[0]);
555 kill(getppid(), SIGUSR1);
556 exit(-1);
557 }
558
559 if (!system_wide && target_tid == -1 && target_pid == -1)
560 evsel_list->threads->map[0] = child_pid;
561
562 close(child_ready_pipe[1]);
563 close(go_pipe[0]);
564 /*
565 * wait for child to settle
566 */
567 if (read(child_ready_pipe[0], &buf, 1) == -1) {
568 perror("unable to read pipe");
569 exit(-1);
570 }
571 close(child_ready_pipe[0]);
572 }
573
574 open_counters(evsel_list);
575
576 /*
577 * perf_session__delete(session) will be called at atexit_header()
578 */
579 atexit(atexit_header);
580
581 if (pipe_output) {
582 err = perf_header__write_pipe(output);
583 if (err < 0)
584 return err;
585 } else if (file_new) {
586 err = perf_session__write_header(session, evsel_list,
587 output, false);
588 if (err < 0)
589 return err;
590 }
591
592 post_processing_offset = lseek(output, 0, SEEK_CUR);
593
594 if (pipe_output) {
595 err = perf_session__synthesize_attrs(session,
596 process_synthesized_event);
597 if (err < 0) {
598 pr_err("Couldn't synthesize attrs.\n");
599 return err;
600 }
601
602 err = perf_event__synthesize_event_types(process_synthesized_event,
603 session);
604 if (err < 0) {
605 pr_err("Couldn't synthesize event_types.\n");
606 return err;
607 }
608
609 if (have_tracepoints(&evsel_list->entries)) {
610 /*
611 * FIXME err <= 0 here actually means that
612 * there were no tracepoints so its not really
613 * an error, just that we don't need to
614 * synthesize anything. We really have to
615 * return this more properly and also
616 * propagate errors that now are calling die()
617 */
618 err = perf_event__synthesize_tracing_data(output, evsel_list,
619 process_synthesized_event,
620 session);
621 if (err <= 0) {
622 pr_err("Couldn't record tracing data.\n");
623 return err;
624 }
625 advance_output(err);
626 }
627 }
628
629 machine = perf_session__find_host_machine(session);
630 if (!machine) {
631 pr_err("Couldn't find native kernel information.\n");
632 return -1;
633 }
634
635 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
636 session, machine, "_text");
637 if (err < 0)
638 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
639 session, machine, "_stext");
640 if (err < 0)
641 pr_err("Couldn't record kernel reference relocation symbol\n"
642 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
643 "Check /proc/kallsyms permission or run as root.\n");
644
645 err = perf_event__synthesize_modules(process_synthesized_event,
646 session, machine);
647 if (err < 0)
648 pr_err("Couldn't record kernel module information.\n"
649 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
650 "Check /proc/modules permission or run as root.\n");
651
652 if (perf_guest)
653 perf_session__process_machines(session,
654 perf_event__synthesize_guest_os);
655
656 if (!system_wide)
657 perf_event__synthesize_thread_map(evsel_list->threads,
658 process_synthesized_event,
659 session);
660 else
661 perf_event__synthesize_threads(process_synthesized_event,
662 session);
663
664 if (realtime_prio) {
665 struct sched_param param;
666
667 param.sched_priority = realtime_prio;
668 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
669 pr_err("Could not set realtime priority.\n");
670 exit(-1);
671 }
672 }
673
674 /*
675 * Let the child rip
676 */
677 if (forks)
678 close(go_pipe[1]);
679
680 for (;;) {
681 int hits = samples;
682 int thread;
683
684 mmap_read_all();
685
686 if (hits == samples) {
687 if (done)
688 break;
689 err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
690 waking++;
691 }
692
693 if (done) {
694 for (i = 0; i < evsel_list->cpus->nr; i++) {
695 struct perf_evsel *pos;
696
697 list_for_each_entry(pos, &evsel_list->entries, node) {
698 for (thread = 0;
699 thread < evsel_list->threads->nr;
700 thread++)
701 ioctl(FD(pos, i, thread),
702 PERF_EVENT_IOC_DISABLE);
703 }
704 }
705 }
706 }
707
708 if (quiet || signr == SIGUSR1)
709 return 0;
710
711 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
712
713 /*
714 * Approximate RIP event size: 24 bytes.
715 */
716 fprintf(stderr,
717 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
718 (double)bytes_written / 1024.0 / 1024.0,
719 output_name,
720 bytes_written / 24);
721
722 return 0;
723
724 out_delete_session:
725 perf_session__delete(session);
726 return err;
727 }
728
729 static const char * const record_usage[] = {
730 "perf record [<options>] [<command>]",
731 "perf record [<options>] -- <command> [<options>]",
732 NULL
733 };
734
735 static bool force, append_file;
736
737 const struct option record_options[] = {
738 OPT_CALLBACK('e', "event", &evsel_list, "event",
739 "event selector. use 'perf list' to list available events",
740 parse_events),
741 OPT_CALLBACK(0, "filter", &evsel_list, "filter",
742 "event filter", parse_filter),
743 OPT_INTEGER('p', "pid", &target_pid,
744 "record events on existing process id"),
745 OPT_INTEGER('t', "tid", &target_tid,
746 "record events on existing thread id"),
747 OPT_INTEGER('r', "realtime", &realtime_prio,
748 "collect data with this RT SCHED_FIFO priority"),
749 OPT_BOOLEAN('D', "no-delay", &nodelay,
750 "collect data without buffering"),
751 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
752 "collect raw sample records from all opened counters"),
753 OPT_BOOLEAN('a', "all-cpus", &system_wide,
754 "system-wide collection from all CPUs"),
755 OPT_BOOLEAN('A', "append", &append_file,
756 "append to the output file to do incremental profiling"),
757 OPT_STRING('C', "cpu", &cpu_list, "cpu",
758 "list of cpus to monitor"),
759 OPT_BOOLEAN('f', "force", &force,
760 "overwrite existing data file (deprecated)"),
761 OPT_U64('c', "count", &user_interval, "event period to sample"),
762 OPT_STRING('o', "output", &output_name, "file",
763 "output file name"),
764 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
765 "child tasks do not inherit counters"),
766 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
767 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
768 OPT_BOOLEAN('g', "call-graph", &call_graph,
769 "do call-graph (stack chain/backtrace) recording"),
770 OPT_INCR('v', "verbose", &verbose,
771 "be more verbose (show counter open errors, etc)"),
772 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
773 OPT_BOOLEAN('s', "stat", &inherit_stat,
774 "per thread counts"),
775 OPT_BOOLEAN('d', "data", &sample_address,
776 "Sample addresses"),
777 OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"),
778 OPT_BOOLEAN('n', "no-samples", &no_samples,
779 "don't sample"),
780 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
781 "do not update the buildid cache"),
782 OPT_BOOLEAN('B', "no-buildid", &no_buildid,
783 "do not collect buildids in perf.data"),
784 OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
785 "monitor event in cgroup name only",
786 parse_cgroups),
787 OPT_END()
788 };
789
790 int cmd_record(int argc, const char **argv, const char *prefix __used)
791 {
792 int err = -ENOMEM;
793 struct perf_evsel *pos;
794
795 evsel_list = perf_evlist__new(NULL, NULL);
796 if (evsel_list == NULL)
797 return -ENOMEM;
798
799 argc = parse_options(argc, argv, record_options, record_usage,
800 PARSE_OPT_STOP_AT_NON_OPTION);
801 if (!argc && target_pid == -1 && target_tid == -1 &&
802 !system_wide && !cpu_list)
803 usage_with_options(record_usage, record_options);
804
805 if (force && append_file) {
806 fprintf(stderr, "Can't overwrite and append at the same time."
807 " You need to choose between -f and -A");
808 usage_with_options(record_usage, record_options);
809 } else if (append_file) {
810 write_mode = WRITE_APPEND;
811 } else {
812 write_mode = WRITE_FORCE;
813 }
814
815 if (nr_cgroups && !system_wide) {
816 fprintf(stderr, "cgroup monitoring only available in"
817 " system-wide mode\n");
818 usage_with_options(record_usage, record_options);
819 }
820
821 symbol__init();
822
823 if (no_buildid_cache || no_buildid)
824 disable_buildid_cache();
825
826 if (evsel_list->nr_entries == 0 &&
827 perf_evlist__add_default(evsel_list) < 0) {
828 pr_err("Not enough memory for event selector list\n");
829 goto out_symbol_exit;
830 }
831
832 if (target_pid != -1)
833 target_tid = target_pid;
834
835 if (perf_evlist__create_maps(evsel_list, target_pid,
836 target_tid, cpu_list) < 0)
837 usage_with_options(record_usage, record_options);
838
839 list_for_each_entry(pos, &evsel_list->entries, node) {
840 if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr,
841 evsel_list->threads->nr) < 0)
842 goto out_free_fd;
843 if (perf_header__push_event(pos->attr.config, event_name(pos)))
844 goto out_free_fd;
845 }
846
847 if (perf_evlist__alloc_pollfd(evsel_list) < 0)
848 goto out_free_fd;
849
850 if (user_interval != ULLONG_MAX)
851 default_interval = user_interval;
852 if (user_freq != UINT_MAX)
853 freq = user_freq;
854
855 /*
856 * User specified count overrides default frequency.
857 */
858 if (default_interval)
859 freq = 0;
860 else if (freq) {
861 default_interval = freq;
862 } else {
863 fprintf(stderr, "frequency and count are zero, aborting\n");
864 err = -EINVAL;
865 goto out_free_fd;
866 }
867
868 err = __cmd_record(argc, argv);
869 out_free_fd:
870 perf_evlist__delete_maps(evsel_list);
871 out_symbol_exit:
872 symbol__exit();
873 return err;
874 }