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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
[linux-btrfs-devel.git] / tools / perf / builtin-record.c
blobf4c3fbee4bad1f4e8be0427adcaa528044e1c9e8
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 enum write_mode_t {
34 WRITE_FORCE,
35 WRITE_APPEND
36 };
37
38 static u64 user_interval = ULLONG_MAX;
39 static u64 default_interval = 0;
40
41 static unsigned int page_size;
42 static unsigned int mmap_pages = UINT_MAX;
43 static unsigned int user_freq = UINT_MAX;
44 static int freq = 1000;
45 static int output;
46 static int pipe_output = 0;
47 static const char *output_name = NULL;
48 static bool group = false;
49 static int realtime_prio = 0;
50 static bool nodelay = false;
51 static bool raw_samples = false;
52 static bool sample_id_all_avail = true;
53 static bool system_wide = false;
54 static pid_t target_pid = -1;
55 static pid_t target_tid = -1;
56 static pid_t child_pid = -1;
57 static bool no_inherit = false;
58 static enum write_mode_t write_mode = WRITE_FORCE;
59 static bool call_graph = false;
60 static bool inherit_stat = false;
61 static bool no_samples = false;
62 static bool sample_address = false;
63 static bool sample_time = false;
64 static bool no_buildid = false;
65 static bool no_buildid_cache = false;
66 static struct perf_evlist *evsel_list;
67
68 static long samples = 0;
69 static u64 bytes_written = 0;
70
71 static int file_new = 1;
72 static off_t post_processing_offset;
73
74 static struct perf_session *session;
75 static const char *cpu_list;
76
77 static void advance_output(size_t size)
78 {
79 bytes_written += size;
80 }
81
82 static void write_output(void *buf, size_t size)
83 {
84 while (size) {
85 int ret = write(output, buf, size);
86
87 if (ret < 0)
88 die("failed to write");
89
90 size -= ret;
91 buf += ret;
92
93 bytes_written += ret;
94 }
95 }
96
97 static int process_synthesized_event(union perf_event *event,
98 struct perf_sample *sample __used,
99 struct perf_session *self __used)
100 {
101 write_output(event, event->header.size);
102 return 0;
103 }
104
105 static void mmap_read(struct perf_mmap *md)
106 {
107 unsigned int head = perf_mmap__read_head(md);
108 unsigned int old = md->prev;
109 unsigned char *data = md->base + page_size;
110 unsigned long size;
111 void *buf;
112
113 if (old == head)
114 return;
115
116 samples++;
117
118 size = head - old;
119
120 if ((old & md->mask) + size != (head & md->mask)) {
121 buf = &data[old & md->mask];
122 size = md->mask + 1 - (old & md->mask);
123 old += size;
124
125 write_output(buf, size);
126 }
127
128 buf = &data[old & md->mask];
129 size = head - old;
130 old += size;
131
132 write_output(buf, size);
133
134 md->prev = old;
135 perf_mmap__write_tail(md, old);
136 }
137
138 static volatile int done = 0;
139 static volatile int signr = -1;
140
141 static void sig_handler(int sig)
142 {
143 done = 1;
144 signr = sig;
145 }
146
147 static void sig_atexit(void)
148 {
149 if (child_pid > 0)
150 kill(child_pid, SIGTERM);
151
152 if (signr == -1 || signr == SIGUSR1)
153 return;
154
155 signal(signr, SIG_DFL);
156 kill(getpid(), signr);
157 }
158
159 static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist)
160 {
161 struct perf_event_attr *attr = &evsel->attr;
162 int track = !evsel->idx; /* only the first counter needs these */
163
164 attr->disabled = 1;
165 attr->inherit = !no_inherit;
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 if (evlist->cpus->map[0] < 0)
255 no_inherit = true;
256
257 list_for_each_entry(pos, &evlist->entries, node) {
258 struct perf_event_attr *attr = &pos->attr;
259 /*
260 * Check if parse_single_tracepoint_event has already asked for
261 * PERF_SAMPLE_TIME.
262 *
263 * XXX this is kludgy but short term fix for problems introduced by
264 * eac23d1c that broke 'perf script' by having different sample_types
265 * when using multiple tracepoint events when we use a perf binary
266 * that tries to use sample_id_all on an older kernel.
267 *
268 * We need to move counter creation to perf_session, support
269 * different sample_types, etc.
270 */
271 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
272
273 config_attr(pos, evlist);
274 retry_sample_id:
275 attr->sample_id_all = sample_id_all_avail ? 1 : 0;
276 try_again:
277 if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group) < 0) {
278 int err = errno;
279
280 if (err == EPERM || err == EACCES) {
281 ui__warning_paranoid();
282 exit(EXIT_FAILURE);
283 } else if (err == ENODEV && cpu_list) {
284 die("No such device - did you specify"
285 " an out-of-range profile CPU?\n");
286 } else if (err == EINVAL && sample_id_all_avail) {
287 /*
288 * Old kernel, no attr->sample_id_type_all field
289 */
290 sample_id_all_avail = false;
291 if (!sample_time && !raw_samples && !time_needed)
292 attr->sample_type &= ~PERF_SAMPLE_TIME;
293
294 goto retry_sample_id;
295 }
296
297 /*
298 * If it's cycles then fall back to hrtimer
299 * based cpu-clock-tick sw counter, which
300 * is always available even if no PMU support:
301 */
302 if (attr->type == PERF_TYPE_HARDWARE
303 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
304
305 if (verbose)
306 ui__warning("The cycles event is not supported, "
307 "trying to fall back to cpu-clock-ticks\n");
308 attr->type = PERF_TYPE_SOFTWARE;
309 attr->config = PERF_COUNT_SW_CPU_CLOCK;
310 goto try_again;
311 }
312
313 if (err == ENOENT) {
314 ui__warning("The %s event is not supported.\n",
315 event_name(pos));
316 exit(EXIT_FAILURE);
317 }
318
319 printf("\n");
320 error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
321 err, strerror(err));
322
323 #if defined(__i386__) || defined(__x86_64__)
324 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
325 die("No hardware sampling interrupt available."
326 " No APIC? If so then you can boot the kernel"
327 " with the \"lapic\" boot parameter to"
328 " force-enable it.\n");
329 #endif
330
331 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
332 }
333 }
334
335 if (perf_evlist__set_filters(evlist)) {
336 error("failed to set filter with %d (%s)\n", errno,
337 strerror(errno));
338 exit(-1);
339 }
340
341 if (perf_evlist__mmap(evlist, mmap_pages, false) < 0)
342 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
343
344 if (file_new)
345 session->evlist = evlist;
346 else {
347 if (!perf_evlist__equal(session->evlist, evlist)) {
348 fprintf(stderr, "incompatible append\n");
349 exit(-1);
350 }
351 }
352
353 perf_session__update_sample_type(session);
354 }
355
356 static int process_buildids(void)
357 {
358 u64 size = lseek(output, 0, SEEK_CUR);
359
360 if (size == 0)
361 return 0;
362
363 session->fd = output;
364 return __perf_session__process_events(session, post_processing_offset,
365 size - post_processing_offset,
366 size, &build_id__mark_dso_hit_ops);
367 }
368
369 static void atexit_header(void)
370 {
371 if (!pipe_output) {
372 session->header.data_size += bytes_written;
373
374 if (!no_buildid)
375 process_buildids();
376 perf_session__write_header(session, evsel_list, output, true);
377 perf_session__delete(session);
378 perf_evlist__delete(evsel_list);
379 symbol__exit();
380 }
381 }
382
383 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
384 {
385 int err;
386 struct perf_session *psession = data;
387
388 if (machine__is_host(machine))
389 return;
390
391 /*
392 *As for guest kernel when processing subcommand record&report,
393 *we arrange module mmap prior to guest kernel mmap and trigger
394 *a preload dso because default guest module symbols are loaded
395 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
396 *method is used to avoid symbol missing when the first addr is
397 *in module instead of in guest kernel.
398 */
399 err = perf_event__synthesize_modules(process_synthesized_event,
400 psession, machine);
401 if (err < 0)
402 pr_err("Couldn't record guest kernel [%d]'s reference"
403 " relocation symbol.\n", machine->pid);
404
405 /*
406 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
407 * have no _text sometimes.
408 */
409 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
410 psession, machine, "_text");
411 if (err < 0)
412 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
413 psession, machine,
414 "_stext");
415 if (err < 0)
416 pr_err("Couldn't record guest kernel [%d]'s reference"
417 " relocation symbol.\n", machine->pid);
418 }
419
420 static struct perf_event_header finished_round_event = {
421 .size = sizeof(struct perf_event_header),
422 .type = PERF_RECORD_FINISHED_ROUND,
423 };
424
425 static void mmap_read_all(void)
426 {
427 int i;
428
429 for (i = 0; i < evsel_list->nr_mmaps; i++) {
430 if (evsel_list->mmap[i].base)
431 mmap_read(&evsel_list->mmap[i]);
432 }
433
434 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
435 write_output(&finished_round_event, sizeof(finished_round_event));
436 }
437
438 static int __cmd_record(int argc, const char **argv)
439 {
440 struct stat st;
441 int flags;
442 int err;
443 unsigned long waking = 0;
444 int child_ready_pipe[2], go_pipe[2];
445 const bool forks = argc > 0;
446 char buf;
447 struct machine *machine;
448
449 page_size = sysconf(_SC_PAGE_SIZE);
450
451 atexit(sig_atexit);
452 signal(SIGCHLD, sig_handler);
453 signal(SIGINT, sig_handler);
454 signal(SIGUSR1, sig_handler);
455
456 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
457 perror("failed to create pipes");
458 exit(-1);
459 }
460
461 if (!output_name) {
462 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
463 pipe_output = 1;
464 else
465 output_name = "perf.data";
466 }
467 if (output_name) {
468 if (!strcmp(output_name, "-"))
469 pipe_output = 1;
470 else if (!stat(output_name, &st) && st.st_size) {
471 if (write_mode == WRITE_FORCE) {
472 char oldname[PATH_MAX];
473 snprintf(oldname, sizeof(oldname), "%s.old",
474 output_name);
475 unlink(oldname);
476 rename(output_name, oldname);
477 }
478 } else if (write_mode == WRITE_APPEND) {
479 write_mode = WRITE_FORCE;
480 }
481 }
482
483 flags = O_CREAT|O_RDWR;
484 if (write_mode == WRITE_APPEND)
485 file_new = 0;
486 else
487 flags |= O_TRUNC;
488
489 if (pipe_output)
490 output = STDOUT_FILENO;
491 else
492 output = open(output_name, flags, S_IRUSR | S_IWUSR);
493 if (output < 0) {
494 perror("failed to create output file");
495 exit(-1);
496 }
497
498 session = perf_session__new(output_name, O_WRONLY,
499 write_mode == WRITE_FORCE, false, NULL);
500 if (session == NULL) {
501 pr_err("Not enough memory for reading perf file header\n");
502 return -1;
503 }
504
505 if (!no_buildid)
506 perf_header__set_feat(&session->header, HEADER_BUILD_ID);
507
508 if (!file_new) {
509 err = perf_session__read_header(session, output);
510 if (err < 0)
511 goto out_delete_session;
512 }
513
514 if (have_tracepoints(&evsel_list->entries))
515 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
516
517 /* 512 kiB: default amount of unprivileged mlocked memory */
518 if (mmap_pages == UINT_MAX)
519 mmap_pages = (512 * 1024) / page_size;
520
521 if (forks) {
522 child_pid = fork();
523 if (child_pid < 0) {
524 perror("failed to fork");
525 exit(-1);
526 }
527
528 if (!child_pid) {
529 if (pipe_output)
530 dup2(2, 1);
531 close(child_ready_pipe[0]);
532 close(go_pipe[1]);
533 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
534
535 /*
536 * Do a dummy execvp to get the PLT entry resolved,
537 * so we avoid the resolver overhead on the real
538 * execvp call.
539 */
540 execvp("", (char **)argv);
541
542 /*
543 * Tell the parent we're ready to go
544 */
545 close(child_ready_pipe[1]);
546
547 /*
548 * Wait until the parent tells us to go.
549 */
550 if (read(go_pipe[0], &buf, 1) == -1)
551 perror("unable to read pipe");
552
553 execvp(argv[0], (char **)argv);
554
555 perror(argv[0]);
556 kill(getppid(), SIGUSR1);
557 exit(-1);
558 }
559
560 if (!system_wide && target_tid == -1 && target_pid == -1)
561 evsel_list->threads->map[0] = child_pid;
562
563 close(child_ready_pipe[1]);
564 close(go_pipe[0]);
565 /*
566 * wait for child to settle
567 */
568 if (read(child_ready_pipe[0], &buf, 1) == -1) {
569 perror("unable to read pipe");
570 exit(-1);
571 }
572 close(child_ready_pipe[0]);
573 }
574
575 open_counters(evsel_list);
576
577 /*
578 * perf_session__delete(session) will be called at atexit_header()
579 */
580 atexit(atexit_header);
581
582 if (pipe_output) {
583 err = perf_header__write_pipe(output);
584 if (err < 0)
585 return err;
586 } else if (file_new) {
587 err = perf_session__write_header(session, evsel_list,
588 output, false);
589 if (err < 0)
590 return err;
591 }
592
593 post_processing_offset = lseek(output, 0, SEEK_CUR);
594
595 if (pipe_output) {
596 err = perf_session__synthesize_attrs(session,
597 process_synthesized_event);
598 if (err < 0) {
599 pr_err("Couldn't synthesize attrs.\n");
600 return err;
601 }
602
603 err = perf_event__synthesize_event_types(process_synthesized_event,
604 session);
605 if (err < 0) {
606 pr_err("Couldn't synthesize event_types.\n");
607 return err;
608 }
609
610 if (have_tracepoints(&evsel_list->entries)) {
611 /*
612 * FIXME err <= 0 here actually means that
613 * there were no tracepoints so its not really
614 * an error, just that we don't need to
615 * synthesize anything. We really have to
616 * return this more properly and also
617 * propagate errors that now are calling die()
618 */
619 err = perf_event__synthesize_tracing_data(output, evsel_list,
620 process_synthesized_event,
621 session);
622 if (err <= 0) {
623 pr_err("Couldn't record tracing data.\n");
624 return err;
625 }
626 advance_output(err);
627 }
628 }
629
630 machine = perf_session__find_host_machine(session);
631 if (!machine) {
632 pr_err("Couldn't find native kernel information.\n");
633 return -1;
634 }
635
636 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
637 session, machine, "_text");
638 if (err < 0)
639 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
640 session, machine, "_stext");
641 if (err < 0)
642 pr_err("Couldn't record kernel reference relocation symbol\n"
643 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
644 "Check /proc/kallsyms permission or run as root.\n");
645
646 err = perf_event__synthesize_modules(process_synthesized_event,
647 session, machine);
648 if (err < 0)
649 pr_err("Couldn't record kernel module information.\n"
650 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
651 "Check /proc/modules permission or run as root.\n");
652
653 if (perf_guest)
654 perf_session__process_machines(session,
655 perf_event__synthesize_guest_os);
656
657 if (!system_wide)
658 perf_event__synthesize_thread_map(evsel_list->threads,
659 process_synthesized_event,
660 session);
661 else
662 perf_event__synthesize_threads(process_synthesized_event,
663 session);
664
665 if (realtime_prio) {
666 struct sched_param param;
667
668 param.sched_priority = realtime_prio;
669 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
670 pr_err("Could not set realtime priority.\n");
671 exit(-1);
672 }
673 }
674
675 perf_evlist__enable(evsel_list);
676
677 /*
678 * Let the child rip
679 */
680 if (forks)
681 close(go_pipe[1]);
682
683 for (;;) {
684 int hits = samples;
685
686 mmap_read_all();
687
688 if (hits == samples) {
689 if (done)
690 break;
691 err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
692 waking++;
693 }
694
695 if (done)
696 perf_evlist__disable(evsel_list);
697 }
698
699 if (quiet || signr == SIGUSR1)
700 return 0;
701
702 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
703
704 /*
705 * Approximate RIP event size: 24 bytes.
706 */
707 fprintf(stderr,
708 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
709 (double)bytes_written / 1024.0 / 1024.0,
710 output_name,
711 bytes_written / 24);
712
713 return 0;
714
715 out_delete_session:
716 perf_session__delete(session);
717 return err;
718 }
719
720 static const char * const record_usage[] = {
721 "perf record [<options>] [<command>]",
722 "perf record [<options>] -- <command> [<options>]",
723 NULL
724 };
725
726 static bool force, append_file;
727
728 const struct option record_options[] = {
729 OPT_CALLBACK('e', "event", &evsel_list, "event",
730 "event selector. use 'perf list' to list available events",
731 parse_events_option),
732 OPT_CALLBACK(0, "filter", &evsel_list, "filter",
733 "event filter", parse_filter),
734 OPT_INTEGER('p', "pid", &target_pid,
735 "record events on existing process id"),
736 OPT_INTEGER('t', "tid", &target_tid,
737 "record events on existing thread id"),
738 OPT_INTEGER('r', "realtime", &realtime_prio,
739 "collect data with this RT SCHED_FIFO priority"),
740 OPT_BOOLEAN('D', "no-delay", &nodelay,
741 "collect data without buffering"),
742 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
743 "collect raw sample records from all opened counters"),
744 OPT_BOOLEAN('a', "all-cpus", &system_wide,
745 "system-wide collection from all CPUs"),
746 OPT_BOOLEAN('A', "append", &append_file,
747 "append to the output file to do incremental profiling"),
748 OPT_STRING('C', "cpu", &cpu_list, "cpu",
749 "list of cpus to monitor"),
750 OPT_BOOLEAN('f', "force", &force,
751 "overwrite existing data file (deprecated)"),
752 OPT_U64('c', "count", &user_interval, "event period to sample"),
753 OPT_STRING('o', "output", &output_name, "file",
754 "output file name"),
755 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
756 "child tasks do not inherit counters"),
757 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
758 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
759 OPT_BOOLEAN(0, "group", &group,
760 "put the counters into a counter group"),
761 OPT_BOOLEAN('g', "call-graph", &call_graph,
762 "do call-graph (stack chain/backtrace) recording"),
763 OPT_INCR('v', "verbose", &verbose,
764 "be more verbose (show counter open errors, etc)"),
765 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
766 OPT_BOOLEAN('s', "stat", &inherit_stat,
767 "per thread counts"),
768 OPT_BOOLEAN('d', "data", &sample_address,
769 "Sample addresses"),
770 OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"),
771 OPT_BOOLEAN('n', "no-samples", &no_samples,
772 "don't sample"),
773 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
774 "do not update the buildid cache"),
775 OPT_BOOLEAN('B', "no-buildid", &no_buildid,
776 "do not collect buildids in perf.data"),
777 OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
778 "monitor event in cgroup name only",
779 parse_cgroups),
780 OPT_END()
781 };
782
783 int cmd_record(int argc, const char **argv, const char *prefix __used)
784 {
785 int err = -ENOMEM;
786 struct perf_evsel *pos;
787
788 evsel_list = perf_evlist__new(NULL, NULL);
789 if (evsel_list == NULL)
790 return -ENOMEM;
791
792 argc = parse_options(argc, argv, record_options, record_usage,
793 PARSE_OPT_STOP_AT_NON_OPTION);
794 if (!argc && target_pid == -1 && target_tid == -1 &&
795 !system_wide && !cpu_list)
796 usage_with_options(record_usage, record_options);
797
798 if (force && append_file) {
799 fprintf(stderr, "Can't overwrite and append at the same time."
800 " You need to choose between -f and -A");
801 usage_with_options(record_usage, record_options);
802 } else if (append_file) {
803 write_mode = WRITE_APPEND;
804 } else {
805 write_mode = WRITE_FORCE;
806 }
807
808 if (nr_cgroups && !system_wide) {
809 fprintf(stderr, "cgroup monitoring only available in"
810 " system-wide mode\n");
811 usage_with_options(record_usage, record_options);
812 }
813
814 symbol__init();
815
816 if (symbol_conf.kptr_restrict)
817 pr_warning(
818 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
819 "check /proc/sys/kernel/kptr_restrict.\n\n"
820 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
821 "file is not found in the buildid cache or in the vmlinux path.\n\n"
822 "Samples in kernel modules won't be resolved at all.\n\n"
823 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
824 "even with a suitable vmlinux or kallsyms file.\n\n");
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 }
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