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Merge tag 'configfs-for-4.8' of git://git.infradead.org/users/hch/configfs
[deliverable/linux.git] / tools / perf / builtin-record.c
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 #include "builtin.h"
9
10 #include "perf.h"
11
12 #include "util/build-id.h"
13 #include "util/util.h"
14 #include <subcmd/parse-options.h>
15 #include "util/parse-events.h"
16 #include "util/config.h"
17
18 #include "util/callchain.h"
19 #include "util/cgroup.h"
20 #include "util/header.h"
21 #include "util/event.h"
22 #include "util/evlist.h"
23 #include "util/evsel.h"
24 #include "util/debug.h"
25 #include "util/session.h"
26 #include "util/tool.h"
27 #include "util/symbol.h"
28 #include "util/cpumap.h"
29 #include "util/thread_map.h"
30 #include "util/data.h"
31 #include "util/perf_regs.h"
32 #include "util/auxtrace.h"
33 #include "util/tsc.h"
34 #include "util/parse-branch-options.h"
35 #include "util/parse-regs-options.h"
36 #include "util/llvm-utils.h"
37 #include "util/bpf-loader.h"
38 #include "util/trigger.h"
39 #include "asm/bug.h"
40
41 #include <unistd.h>
42 #include <sched.h>
43 #include <sys/mman.h>
44 #include <asm/bug.h>
45
46
47 struct record {
48 struct perf_tool tool;
49 struct record_opts opts;
50 u64 bytes_written;
51 struct perf_data_file file;
52 struct auxtrace_record *itr;
53 struct perf_evlist *evlist;
54 struct perf_session *session;
55 const char *progname;
56 int realtime_prio;
57 bool no_buildid;
58 bool no_buildid_set;
59 bool no_buildid_cache;
60 bool no_buildid_cache_set;
61 bool buildid_all;
62 bool timestamp_filename;
63 bool switch_output;
64 unsigned long long samples;
65 };
66
67 static int record__write(struct record *rec, void *bf, size_t size)
68 {
69 if (perf_data_file__write(rec->session->file, bf, size) < 0) {
70 pr_err("failed to write perf data, error: %m\n");
71 return -1;
72 }
73
74 rec->bytes_written += size;
75 return 0;
76 }
77
78 static int process_synthesized_event(struct perf_tool *tool,
79 union perf_event *event,
80 struct perf_sample *sample __maybe_unused,
81 struct machine *machine __maybe_unused)
82 {
83 struct record *rec = container_of(tool, struct record, tool);
84 return record__write(rec, event, event->header.size);
85 }
86
87 static int
88 backward_rb_find_range(void *buf, int mask, u64 head, u64 *start, u64 *end)
89 {
90 struct perf_event_header *pheader;
91 u64 evt_head = head;
92 int size = mask + 1;
93
94 pr_debug2("backward_rb_find_range: buf=%p, head=%"PRIx64"\n", buf, head);
95 pheader = (struct perf_event_header *)(buf + (head & mask));
96 *start = head;
97 while (true) {
98 if (evt_head - head >= (unsigned int)size) {
99 pr_debug("Finshed reading backward ring buffer: rewind\n");
100 if (evt_head - head > (unsigned int)size)
101 evt_head -= pheader->size;
102 *end = evt_head;
103 return 0;
104 }
105
106 pheader = (struct perf_event_header *)(buf + (evt_head & mask));
107
108 if (pheader->size == 0) {
109 pr_debug("Finshed reading backward ring buffer: get start\n");
110 *end = evt_head;
111 return 0;
112 }
113
114 evt_head += pheader->size;
115 pr_debug3("move evt_head: %"PRIx64"\n", evt_head);
116 }
117 WARN_ONCE(1, "Shouldn't get here\n");
118 return -1;
119 }
120
121 static int
122 rb_find_range(void *data, int mask, u64 head, u64 old,
123 u64 *start, u64 *end, bool backward)
124 {
125 if (!backward) {
126 *start = old;
127 *end = head;
128 return 0;
129 }
130
131 return backward_rb_find_range(data, mask, head, start, end);
132 }
133
134 static int
135 record__mmap_read(struct record *rec, struct perf_mmap *md,
136 bool overwrite, bool backward)
137 {
138 u64 head = perf_mmap__read_head(md);
139 u64 old = md->prev;
140 u64 end = head, start = old;
141 unsigned char *data = md->base + page_size;
142 unsigned long size;
143 void *buf;
144 int rc = 0;
145
146 if (rb_find_range(data, md->mask, head,
147 old, &start, &end, backward))
148 return -1;
149
150 if (start == end)
151 return 0;
152
153 rec->samples++;
154
155 size = end - start;
156 if (size > (unsigned long)(md->mask) + 1) {
157 WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
158
159 md->prev = head;
160 perf_mmap__consume(md, overwrite || backward);
161 return 0;
162 }
163
164 if ((start & md->mask) + size != (end & md->mask)) {
165 buf = &data[start & md->mask];
166 size = md->mask + 1 - (start & md->mask);
167 start += size;
168
169 if (record__write(rec, buf, size) < 0) {
170 rc = -1;
171 goto out;
172 }
173 }
174
175 buf = &data[start & md->mask];
176 size = end - start;
177 start += size;
178
179 if (record__write(rec, buf, size) < 0) {
180 rc = -1;
181 goto out;
182 }
183
184 md->prev = head;
185 perf_mmap__consume(md, overwrite || backward);
186 out:
187 return rc;
188 }
189
190 static volatile int done;
191 static volatile int signr = -1;
192 static volatile int child_finished;
193
194 static volatile int auxtrace_record__snapshot_started;
195 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
196 static DEFINE_TRIGGER(switch_output_trigger);
197
198 static void sig_handler(int sig)
199 {
200 if (sig == SIGCHLD)
201 child_finished = 1;
202 else
203 signr = sig;
204
205 done = 1;
206 }
207
208 static void record__sig_exit(void)
209 {
210 if (signr == -1)
211 return;
212
213 signal(signr, SIG_DFL);
214 raise(signr);
215 }
216
217 #ifdef HAVE_AUXTRACE_SUPPORT
218
219 static int record__process_auxtrace(struct perf_tool *tool,
220 union perf_event *event, void *data1,
221 size_t len1, void *data2, size_t len2)
222 {
223 struct record *rec = container_of(tool, struct record, tool);
224 struct perf_data_file *file = &rec->file;
225 size_t padding;
226 u8 pad[8] = {0};
227
228 if (!perf_data_file__is_pipe(file)) {
229 off_t file_offset;
230 int fd = perf_data_file__fd(file);
231 int err;
232
233 file_offset = lseek(fd, 0, SEEK_CUR);
234 if (file_offset == -1)
235 return -1;
236 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
237 event, file_offset);
238 if (err)
239 return err;
240 }
241
242 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
243 padding = (len1 + len2) & 7;
244 if (padding)
245 padding = 8 - padding;
246
247 record__write(rec, event, event->header.size);
248 record__write(rec, data1, len1);
249 if (len2)
250 record__write(rec, data2, len2);
251 record__write(rec, &pad, padding);
252
253 return 0;
254 }
255
256 static int record__auxtrace_mmap_read(struct record *rec,
257 struct auxtrace_mmap *mm)
258 {
259 int ret;
260
261 ret = auxtrace_mmap__read(mm, rec->itr, &rec->tool,
262 record__process_auxtrace);
263 if (ret < 0)
264 return ret;
265
266 if (ret)
267 rec->samples++;
268
269 return 0;
270 }
271
272 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
273 struct auxtrace_mmap *mm)
274 {
275 int ret;
276
277 ret = auxtrace_mmap__read_snapshot(mm, rec->itr, &rec->tool,
278 record__process_auxtrace,
279 rec->opts.auxtrace_snapshot_size);
280 if (ret < 0)
281 return ret;
282
283 if (ret)
284 rec->samples++;
285
286 return 0;
287 }
288
289 static int record__auxtrace_read_snapshot_all(struct record *rec)
290 {
291 int i;
292 int rc = 0;
293
294 for (i = 0; i < rec->evlist->nr_mmaps; i++) {
295 struct auxtrace_mmap *mm =
296 &rec->evlist->mmap[i].auxtrace_mmap;
297
298 if (!mm->base)
299 continue;
300
301 if (record__auxtrace_mmap_read_snapshot(rec, mm) != 0) {
302 rc = -1;
303 goto out;
304 }
305 }
306 out:
307 return rc;
308 }
309
310 static void record__read_auxtrace_snapshot(struct record *rec)
311 {
312 pr_debug("Recording AUX area tracing snapshot\n");
313 if (record__auxtrace_read_snapshot_all(rec) < 0) {
314 trigger_error(&auxtrace_snapshot_trigger);
315 } else {
316 if (auxtrace_record__snapshot_finish(rec->itr))
317 trigger_error(&auxtrace_snapshot_trigger);
318 else
319 trigger_ready(&auxtrace_snapshot_trigger);
320 }
321 }
322
323 #else
324
325 static inline
326 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
327 struct auxtrace_mmap *mm __maybe_unused)
328 {
329 return 0;
330 }
331
332 static inline
333 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused)
334 {
335 }
336
337 static inline
338 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
339 {
340 return 0;
341 }
342
343 #endif
344
345 static int record__mmap_evlist(struct record *rec,
346 struct perf_evlist *evlist)
347 {
348 struct record_opts *opts = &rec->opts;
349 char msg[512];
350
351 if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
352 opts->auxtrace_mmap_pages,
353 opts->auxtrace_snapshot_mode) < 0) {
354 if (errno == EPERM) {
355 pr_err("Permission error mapping pages.\n"
356 "Consider increasing "
357 "/proc/sys/kernel/perf_event_mlock_kb,\n"
358 "or try again with a smaller value of -m/--mmap_pages.\n"
359 "(current value: %u,%u)\n",
360 opts->mmap_pages, opts->auxtrace_mmap_pages);
361 return -errno;
362 } else {
363 pr_err("failed to mmap with %d (%s)\n", errno,
364 str_error_r(errno, msg, sizeof(msg)));
365 if (errno)
366 return -errno;
367 else
368 return -EINVAL;
369 }
370 }
371 return 0;
372 }
373
374 static int record__mmap(struct record *rec)
375 {
376 return record__mmap_evlist(rec, rec->evlist);
377 }
378
379 static int record__open(struct record *rec)
380 {
381 char msg[512];
382 struct perf_evsel *pos;
383 struct perf_evlist *evlist = rec->evlist;
384 struct perf_session *session = rec->session;
385 struct record_opts *opts = &rec->opts;
386 int rc = 0;
387
388 perf_evlist__config(evlist, opts, &callchain_param);
389
390 evlist__for_each_entry(evlist, pos) {
391 try_again:
392 if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) {
393 if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
394 if (verbose)
395 ui__warning("%s\n", msg);
396 goto try_again;
397 }
398
399 rc = -errno;
400 perf_evsel__open_strerror(pos, &opts->target,
401 errno, msg, sizeof(msg));
402 ui__error("%s\n", msg);
403 goto out;
404 }
405 }
406
407 if (perf_evlist__apply_filters(evlist, &pos)) {
408 error("failed to set filter \"%s\" on event %s with %d (%s)\n",
409 pos->filter, perf_evsel__name(pos), errno,
410 str_error_r(errno, msg, sizeof(msg)));
411 rc = -1;
412 goto out;
413 }
414
415 rc = record__mmap(rec);
416 if (rc)
417 goto out;
418
419 session->evlist = evlist;
420 perf_session__set_id_hdr_size(session);
421 out:
422 return rc;
423 }
424
425 static int process_sample_event(struct perf_tool *tool,
426 union perf_event *event,
427 struct perf_sample *sample,
428 struct perf_evsel *evsel,
429 struct machine *machine)
430 {
431 struct record *rec = container_of(tool, struct record, tool);
432
433 rec->samples++;
434
435 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
436 }
437
438 static int process_buildids(struct record *rec)
439 {
440 struct perf_data_file *file = &rec->file;
441 struct perf_session *session = rec->session;
442
443 if (file->size == 0)
444 return 0;
445
446 /*
447 * During this process, it'll load kernel map and replace the
448 * dso->long_name to a real pathname it found. In this case
449 * we prefer the vmlinux path like
450 * /lib/modules/3.16.4/build/vmlinux
451 *
452 * rather than build-id path (in debug directory).
453 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
454 */
455 symbol_conf.ignore_vmlinux_buildid = true;
456
457 /*
458 * If --buildid-all is given, it marks all DSO regardless of hits,
459 * so no need to process samples.
460 */
461 if (rec->buildid_all)
462 rec->tool.sample = NULL;
463
464 return perf_session__process_events(session);
465 }
466
467 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
468 {
469 int err;
470 struct perf_tool *tool = data;
471 /*
472 *As for guest kernel when processing subcommand record&report,
473 *we arrange module mmap prior to guest kernel mmap and trigger
474 *a preload dso because default guest module symbols are loaded
475 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
476 *method is used to avoid symbol missing when the first addr is
477 *in module instead of in guest kernel.
478 */
479 err = perf_event__synthesize_modules(tool, process_synthesized_event,
480 machine);
481 if (err < 0)
482 pr_err("Couldn't record guest kernel [%d]'s reference"
483 " relocation symbol.\n", machine->pid);
484
485 /*
486 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
487 * have no _text sometimes.
488 */
489 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
490 machine);
491 if (err < 0)
492 pr_err("Couldn't record guest kernel [%d]'s reference"
493 " relocation symbol.\n", machine->pid);
494 }
495
496 static struct perf_event_header finished_round_event = {
497 .size = sizeof(struct perf_event_header),
498 .type = PERF_RECORD_FINISHED_ROUND,
499 };
500
501 static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist,
502 bool backward)
503 {
504 u64 bytes_written = rec->bytes_written;
505 int i;
506 int rc = 0;
507 struct perf_mmap *maps;
508
509 if (!evlist)
510 return 0;
511
512 maps = backward ? evlist->backward_mmap : evlist->mmap;
513 if (!maps)
514 return 0;
515
516 if (backward && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
517 return 0;
518
519 for (i = 0; i < evlist->nr_mmaps; i++) {
520 struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap;
521
522 if (maps[i].base) {
523 if (record__mmap_read(rec, &maps[i],
524 evlist->overwrite, backward) != 0) {
525 rc = -1;
526 goto out;
527 }
528 }
529
530 if (mm->base && !rec->opts.auxtrace_snapshot_mode &&
531 record__auxtrace_mmap_read(rec, mm) != 0) {
532 rc = -1;
533 goto out;
534 }
535 }
536
537 /*
538 * Mark the round finished in case we wrote
539 * at least one event.
540 */
541 if (bytes_written != rec->bytes_written)
542 rc = record__write(rec, &finished_round_event, sizeof(finished_round_event));
543
544 if (backward)
545 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
546 out:
547 return rc;
548 }
549
550 static int record__mmap_read_all(struct record *rec)
551 {
552 int err;
553
554 err = record__mmap_read_evlist(rec, rec->evlist, false);
555 if (err)
556 return err;
557
558 return record__mmap_read_evlist(rec, rec->evlist, true);
559 }
560
561 static void record__init_features(struct record *rec)
562 {
563 struct perf_session *session = rec->session;
564 int feat;
565
566 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
567 perf_header__set_feat(&session->header, feat);
568
569 if (rec->no_buildid)
570 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
571
572 if (!have_tracepoints(&rec->evlist->entries))
573 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
574
575 if (!rec->opts.branch_stack)
576 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
577
578 if (!rec->opts.full_auxtrace)
579 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
580
581 perf_header__clear_feat(&session->header, HEADER_STAT);
582 }
583
584 static void
585 record__finish_output(struct record *rec)
586 {
587 struct perf_data_file *file = &rec->file;
588 int fd = perf_data_file__fd(file);
589
590 if (file->is_pipe)
591 return;
592
593 rec->session->header.data_size += rec->bytes_written;
594 file->size = lseek(perf_data_file__fd(file), 0, SEEK_CUR);
595
596 if (!rec->no_buildid) {
597 process_buildids(rec);
598
599 if (rec->buildid_all)
600 dsos__hit_all(rec->session);
601 }
602 perf_session__write_header(rec->session, rec->evlist, fd, true);
603
604 return;
605 }
606
607 static int record__synthesize_workload(struct record *rec, bool tail)
608 {
609 struct {
610 struct thread_map map;
611 struct thread_map_data map_data;
612 } thread_map;
613
614 if (rec->opts.tail_synthesize != tail)
615 return 0;
616
617 thread_map.map.nr = 1;
618 thread_map.map.map[0].pid = rec->evlist->workload.pid;
619 thread_map.map.map[0].comm = NULL;
620 return perf_event__synthesize_thread_map(&rec->tool, &thread_map.map,
621 process_synthesized_event,
622 &rec->session->machines.host,
623 rec->opts.sample_address,
624 rec->opts.proc_map_timeout);
625 }
626
627 static int record__synthesize(struct record *rec, bool tail);
628
629 static int
630 record__switch_output(struct record *rec, bool at_exit)
631 {
632 struct perf_data_file *file = &rec->file;
633 int fd, err;
634
635 /* Same Size: "2015122520103046"*/
636 char timestamp[] = "InvalidTimestamp";
637
638 record__synthesize(rec, true);
639 if (target__none(&rec->opts.target))
640 record__synthesize_workload(rec, true);
641
642 rec->samples = 0;
643 record__finish_output(rec);
644 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
645 if (err) {
646 pr_err("Failed to get current timestamp\n");
647 return -EINVAL;
648 }
649
650 fd = perf_data_file__switch(file, timestamp,
651 rec->session->header.data_offset,
652 at_exit);
653 if (fd >= 0 && !at_exit) {
654 rec->bytes_written = 0;
655 rec->session->header.data_size = 0;
656 }
657
658 if (!quiet)
659 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
660 file->path, timestamp);
661
662 /* Output tracking events */
663 if (!at_exit) {
664 record__synthesize(rec, false);
665
666 /*
667 * In 'perf record --switch-output' without -a,
668 * record__synthesize() in record__switch_output() won't
669 * generate tracking events because there's no thread_map
670 * in evlist. Which causes newly created perf.data doesn't
671 * contain map and comm information.
672 * Create a fake thread_map and directly call
673 * perf_event__synthesize_thread_map() for those events.
674 */
675 if (target__none(&rec->opts.target))
676 record__synthesize_workload(rec, false);
677 }
678 return fd;
679 }
680
681 static volatile int workload_exec_errno;
682
683 /*
684 * perf_evlist__prepare_workload will send a SIGUSR1
685 * if the fork fails, since we asked by setting its
686 * want_signal to true.
687 */
688 static void workload_exec_failed_signal(int signo __maybe_unused,
689 siginfo_t *info,
690 void *ucontext __maybe_unused)
691 {
692 workload_exec_errno = info->si_value.sival_int;
693 done = 1;
694 child_finished = 1;
695 }
696
697 static void snapshot_sig_handler(int sig);
698
699 int __weak
700 perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
701 struct perf_tool *tool __maybe_unused,
702 perf_event__handler_t process __maybe_unused,
703 struct machine *machine __maybe_unused)
704 {
705 return 0;
706 }
707
708 static const struct perf_event_mmap_page *
709 perf_evlist__pick_pc(struct perf_evlist *evlist)
710 {
711 if (evlist) {
712 if (evlist->mmap && evlist->mmap[0].base)
713 return evlist->mmap[0].base;
714 if (evlist->backward_mmap && evlist->backward_mmap[0].base)
715 return evlist->backward_mmap[0].base;
716 }
717 return NULL;
718 }
719
720 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
721 {
722 const struct perf_event_mmap_page *pc;
723
724 pc = perf_evlist__pick_pc(rec->evlist);
725 if (pc)
726 return pc;
727 return NULL;
728 }
729
730 static int record__synthesize(struct record *rec, bool tail)
731 {
732 struct perf_session *session = rec->session;
733 struct machine *machine = &session->machines.host;
734 struct perf_data_file *file = &rec->file;
735 struct record_opts *opts = &rec->opts;
736 struct perf_tool *tool = &rec->tool;
737 int fd = perf_data_file__fd(file);
738 int err = 0;
739
740 if (rec->opts.tail_synthesize != tail)
741 return 0;
742
743 if (file->is_pipe) {
744 err = perf_event__synthesize_attrs(tool, session,
745 process_synthesized_event);
746 if (err < 0) {
747 pr_err("Couldn't synthesize attrs.\n");
748 goto out;
749 }
750
751 if (have_tracepoints(&rec->evlist->entries)) {
752 /*
753 * FIXME err <= 0 here actually means that
754 * there were no tracepoints so its not really
755 * an error, just that we don't need to
756 * synthesize anything. We really have to
757 * return this more properly and also
758 * propagate errors that now are calling die()
759 */
760 err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
761 process_synthesized_event);
762 if (err <= 0) {
763 pr_err("Couldn't record tracing data.\n");
764 goto out;
765 }
766 rec->bytes_written += err;
767 }
768 }
769
770 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
771 process_synthesized_event, machine);
772 if (err)
773 goto out;
774
775 if (rec->opts.full_auxtrace) {
776 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
777 session, process_synthesized_event);
778 if (err)
779 goto out;
780 }
781
782 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
783 machine);
784 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
785 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
786 "Check /proc/kallsyms permission or run as root.\n");
787
788 err = perf_event__synthesize_modules(tool, process_synthesized_event,
789 machine);
790 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
791 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
792 "Check /proc/modules permission or run as root.\n");
793
794 if (perf_guest) {
795 machines__process_guests(&session->machines,
796 perf_event__synthesize_guest_os, tool);
797 }
798
799 err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
800 process_synthesized_event, opts->sample_address,
801 opts->proc_map_timeout);
802 out:
803 return err;
804 }
805
806 static int __cmd_record(struct record *rec, int argc, const char **argv)
807 {
808 int err;
809 int status = 0;
810 unsigned long waking = 0;
811 const bool forks = argc > 0;
812 struct machine *machine;
813 struct perf_tool *tool = &rec->tool;
814 struct record_opts *opts = &rec->opts;
815 struct perf_data_file *file = &rec->file;
816 struct perf_session *session;
817 bool disabled = false, draining = false;
818 int fd;
819
820 rec->progname = argv[0];
821
822 atexit(record__sig_exit);
823 signal(SIGCHLD, sig_handler);
824 signal(SIGINT, sig_handler);
825 signal(SIGTERM, sig_handler);
826
827 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output) {
828 signal(SIGUSR2, snapshot_sig_handler);
829 if (rec->opts.auxtrace_snapshot_mode)
830 trigger_on(&auxtrace_snapshot_trigger);
831 if (rec->switch_output)
832 trigger_on(&switch_output_trigger);
833 } else {
834 signal(SIGUSR2, SIG_IGN);
835 }
836
837 session = perf_session__new(file, false, tool);
838 if (session == NULL) {
839 pr_err("Perf session creation failed.\n");
840 return -1;
841 }
842
843 fd = perf_data_file__fd(file);
844 rec->session = session;
845
846 record__init_features(rec);
847
848 if (forks) {
849 err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
850 argv, file->is_pipe,
851 workload_exec_failed_signal);
852 if (err < 0) {
853 pr_err("Couldn't run the workload!\n");
854 status = err;
855 goto out_delete_session;
856 }
857 }
858
859 if (record__open(rec) != 0) {
860 err = -1;
861 goto out_child;
862 }
863
864 err = bpf__apply_obj_config();
865 if (err) {
866 char errbuf[BUFSIZ];
867
868 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
869 pr_err("ERROR: Apply config to BPF failed: %s\n",
870 errbuf);
871 goto out_child;
872 }
873
874 /*
875 * Normally perf_session__new would do this, but it doesn't have the
876 * evlist.
877 */
878 if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) {
879 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
880 rec->tool.ordered_events = false;
881 }
882
883 if (!rec->evlist->nr_groups)
884 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
885
886 if (file->is_pipe) {
887 err = perf_header__write_pipe(fd);
888 if (err < 0)
889 goto out_child;
890 } else {
891 err = perf_session__write_header(session, rec->evlist, fd, false);
892 if (err < 0)
893 goto out_child;
894 }
895
896 if (!rec->no_buildid
897 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
898 pr_err("Couldn't generate buildids. "
899 "Use --no-buildid to profile anyway.\n");
900 err = -1;
901 goto out_child;
902 }
903
904 machine = &session->machines.host;
905
906 err = record__synthesize(rec, false);
907 if (err < 0)
908 goto out_child;
909
910 if (rec->realtime_prio) {
911 struct sched_param param;
912
913 param.sched_priority = rec->realtime_prio;
914 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
915 pr_err("Could not set realtime priority.\n");
916 err = -1;
917 goto out_child;
918 }
919 }
920
921 /*
922 * When perf is starting the traced process, all the events
923 * (apart from group members) have enable_on_exec=1 set,
924 * so don't spoil it by prematurely enabling them.
925 */
926 if (!target__none(&opts->target) && !opts->initial_delay)
927 perf_evlist__enable(rec->evlist);
928
929 /*
930 * Let the child rip
931 */
932 if (forks) {
933 union perf_event *event;
934
935 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
936 if (event == NULL) {
937 err = -ENOMEM;
938 goto out_child;
939 }
940
941 /*
942 * Some H/W events are generated before COMM event
943 * which is emitted during exec(), so perf script
944 * cannot see a correct process name for those events.
945 * Synthesize COMM event to prevent it.
946 */
947 perf_event__synthesize_comm(tool, event,
948 rec->evlist->workload.pid,
949 process_synthesized_event,
950 machine);
951 free(event);
952
953 perf_evlist__start_workload(rec->evlist);
954 }
955
956 if (opts->initial_delay) {
957 usleep(opts->initial_delay * 1000);
958 perf_evlist__enable(rec->evlist);
959 }
960
961 trigger_ready(&auxtrace_snapshot_trigger);
962 trigger_ready(&switch_output_trigger);
963 for (;;) {
964 unsigned long long hits = rec->samples;
965
966 /*
967 * rec->evlist->bkw_mmap_state is possible to be
968 * BKW_MMAP_EMPTY here: when done == true and
969 * hits != rec->samples in previous round.
970 *
971 * perf_evlist__toggle_bkw_mmap ensure we never
972 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
973 */
974 if (trigger_is_hit(&switch_output_trigger) || done || draining)
975 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
976
977 if (record__mmap_read_all(rec) < 0) {
978 trigger_error(&auxtrace_snapshot_trigger);
979 trigger_error(&switch_output_trigger);
980 err = -1;
981 goto out_child;
982 }
983
984 if (auxtrace_record__snapshot_started) {
985 auxtrace_record__snapshot_started = 0;
986 if (!trigger_is_error(&auxtrace_snapshot_trigger))
987 record__read_auxtrace_snapshot(rec);
988 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
989 pr_err("AUX area tracing snapshot failed\n");
990 err = -1;
991 goto out_child;
992 }
993 }
994
995 if (trigger_is_hit(&switch_output_trigger)) {
996 /*
997 * If switch_output_trigger is hit, the data in
998 * overwritable ring buffer should have been collected,
999 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1000 *
1001 * If SIGUSR2 raise after or during record__mmap_read_all(),
1002 * record__mmap_read_all() didn't collect data from
1003 * overwritable ring buffer. Read again.
1004 */
1005 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1006 continue;
1007 trigger_ready(&switch_output_trigger);
1008
1009 /*
1010 * Reenable events in overwrite ring buffer after
1011 * record__mmap_read_all(): we should have collected
1012 * data from it.
1013 */
1014 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1015
1016 if (!quiet)
1017 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1018 waking);
1019 waking = 0;
1020 fd = record__switch_output(rec, false);
1021 if (fd < 0) {
1022 pr_err("Failed to switch to new file\n");
1023 trigger_error(&switch_output_trigger);
1024 err = fd;
1025 goto out_child;
1026 }
1027 }
1028
1029 if (hits == rec->samples) {
1030 if (done || draining)
1031 break;
1032 err = perf_evlist__poll(rec->evlist, -1);
1033 /*
1034 * Propagate error, only if there's any. Ignore positive
1035 * number of returned events and interrupt error.
1036 */
1037 if (err > 0 || (err < 0 && errno == EINTR))
1038 err = 0;
1039 waking++;
1040
1041 if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1042 draining = true;
1043 }
1044
1045 /*
1046 * When perf is starting the traced process, at the end events
1047 * die with the process and we wait for that. Thus no need to
1048 * disable events in this case.
1049 */
1050 if (done && !disabled && !target__none(&opts->target)) {
1051 trigger_off(&auxtrace_snapshot_trigger);
1052 perf_evlist__disable(rec->evlist);
1053 disabled = true;
1054 }
1055 }
1056 trigger_off(&auxtrace_snapshot_trigger);
1057 trigger_off(&switch_output_trigger);
1058
1059 if (forks && workload_exec_errno) {
1060 char msg[STRERR_BUFSIZE];
1061 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1062 pr_err("Workload failed: %s\n", emsg);
1063 err = -1;
1064 goto out_child;
1065 }
1066
1067 if (!quiet)
1068 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1069
1070 if (target__none(&rec->opts.target))
1071 record__synthesize_workload(rec, true);
1072
1073 out_child:
1074 if (forks) {
1075 int exit_status;
1076
1077 if (!child_finished)
1078 kill(rec->evlist->workload.pid, SIGTERM);
1079
1080 wait(&exit_status);
1081
1082 if (err < 0)
1083 status = err;
1084 else if (WIFEXITED(exit_status))
1085 status = WEXITSTATUS(exit_status);
1086 else if (WIFSIGNALED(exit_status))
1087 signr = WTERMSIG(exit_status);
1088 } else
1089 status = err;
1090
1091 record__synthesize(rec, true);
1092 /* this will be recalculated during process_buildids() */
1093 rec->samples = 0;
1094
1095 if (!err) {
1096 if (!rec->timestamp_filename) {
1097 record__finish_output(rec);
1098 } else {
1099 fd = record__switch_output(rec, true);
1100 if (fd < 0) {
1101 status = fd;
1102 goto out_delete_session;
1103 }
1104 }
1105 }
1106
1107 if (!err && !quiet) {
1108 char samples[128];
1109 const char *postfix = rec->timestamp_filename ?
1110 ".<timestamp>" : "";
1111
1112 if (rec->samples && !rec->opts.full_auxtrace)
1113 scnprintf(samples, sizeof(samples),
1114 " (%" PRIu64 " samples)", rec->samples);
1115 else
1116 samples[0] = '\0';
1117
1118 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
1119 perf_data_file__size(file) / 1024.0 / 1024.0,
1120 file->path, postfix, samples);
1121 }
1122
1123 out_delete_session:
1124 perf_session__delete(session);
1125 return status;
1126 }
1127
1128 static void callchain_debug(struct callchain_param *callchain)
1129 {
1130 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
1131
1132 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
1133
1134 if (callchain->record_mode == CALLCHAIN_DWARF)
1135 pr_debug("callchain: stack dump size %d\n",
1136 callchain->dump_size);
1137 }
1138
1139 int record_opts__parse_callchain(struct record_opts *record,
1140 struct callchain_param *callchain,
1141 const char *arg, bool unset)
1142 {
1143 int ret;
1144 callchain->enabled = !unset;
1145
1146 /* --no-call-graph */
1147 if (unset) {
1148 callchain->record_mode = CALLCHAIN_NONE;
1149 pr_debug("callchain: disabled\n");
1150 return 0;
1151 }
1152
1153 ret = parse_callchain_record_opt(arg, callchain);
1154 if (!ret) {
1155 /* Enable data address sampling for DWARF unwind. */
1156 if (callchain->record_mode == CALLCHAIN_DWARF)
1157 record->sample_address = true;
1158 callchain_debug(callchain);
1159 }
1160
1161 return ret;
1162 }
1163
1164 int record_parse_callchain_opt(const struct option *opt,
1165 const char *arg,
1166 int unset)
1167 {
1168 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
1169 }
1170
1171 int record_callchain_opt(const struct option *opt,
1172 const char *arg __maybe_unused,
1173 int unset __maybe_unused)
1174 {
1175 struct callchain_param *callchain = opt->value;
1176
1177 callchain->enabled = true;
1178
1179 if (callchain->record_mode == CALLCHAIN_NONE)
1180 callchain->record_mode = CALLCHAIN_FP;
1181
1182 callchain_debug(callchain);
1183 return 0;
1184 }
1185
1186 static int perf_record_config(const char *var, const char *value, void *cb)
1187 {
1188 struct record *rec = cb;
1189
1190 if (!strcmp(var, "record.build-id")) {
1191 if (!strcmp(value, "cache"))
1192 rec->no_buildid_cache = false;
1193 else if (!strcmp(value, "no-cache"))
1194 rec->no_buildid_cache = true;
1195 else if (!strcmp(value, "skip"))
1196 rec->no_buildid = true;
1197 else
1198 return -1;
1199 return 0;
1200 }
1201 if (!strcmp(var, "record.call-graph"))
1202 var = "call-graph.record-mode"; /* fall-through */
1203
1204 return perf_default_config(var, value, cb);
1205 }
1206
1207 struct clockid_map {
1208 const char *name;
1209 int clockid;
1210 };
1211
1212 #define CLOCKID_MAP(n, c) \
1213 { .name = n, .clockid = (c), }
1214
1215 #define CLOCKID_END { .name = NULL, }
1216
1217
1218 /*
1219 * Add the missing ones, we need to build on many distros...
1220 */
1221 #ifndef CLOCK_MONOTONIC_RAW
1222 #define CLOCK_MONOTONIC_RAW 4
1223 #endif
1224 #ifndef CLOCK_BOOTTIME
1225 #define CLOCK_BOOTTIME 7
1226 #endif
1227 #ifndef CLOCK_TAI
1228 #define CLOCK_TAI 11
1229 #endif
1230
1231 static const struct clockid_map clockids[] = {
1232 /* available for all events, NMI safe */
1233 CLOCKID_MAP("monotonic", CLOCK_MONOTONIC),
1234 CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW),
1235
1236 /* available for some events */
1237 CLOCKID_MAP("realtime", CLOCK_REALTIME),
1238 CLOCKID_MAP("boottime", CLOCK_BOOTTIME),
1239 CLOCKID_MAP("tai", CLOCK_TAI),
1240
1241 /* available for the lazy */
1242 CLOCKID_MAP("mono", CLOCK_MONOTONIC),
1243 CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW),
1244 CLOCKID_MAP("real", CLOCK_REALTIME),
1245 CLOCKID_MAP("boot", CLOCK_BOOTTIME),
1246
1247 CLOCKID_END,
1248 };
1249
1250 static int parse_clockid(const struct option *opt, const char *str, int unset)
1251 {
1252 struct record_opts *opts = (struct record_opts *)opt->value;
1253 const struct clockid_map *cm;
1254 const char *ostr = str;
1255
1256 if (unset) {
1257 opts->use_clockid = 0;
1258 return 0;
1259 }
1260
1261 /* no arg passed */
1262 if (!str)
1263 return 0;
1264
1265 /* no setting it twice */
1266 if (opts->use_clockid)
1267 return -1;
1268
1269 opts->use_clockid = true;
1270
1271 /* if its a number, we're done */
1272 if (sscanf(str, "%d", &opts->clockid) == 1)
1273 return 0;
1274
1275 /* allow a "CLOCK_" prefix to the name */
1276 if (!strncasecmp(str, "CLOCK_", 6))
1277 str += 6;
1278
1279 for (cm = clockids; cm->name; cm++) {
1280 if (!strcasecmp(str, cm->name)) {
1281 opts->clockid = cm->clockid;
1282 return 0;
1283 }
1284 }
1285
1286 opts->use_clockid = false;
1287 ui__warning("unknown clockid %s, check man page\n", ostr);
1288 return -1;
1289 }
1290
1291 static int record__parse_mmap_pages(const struct option *opt,
1292 const char *str,
1293 int unset __maybe_unused)
1294 {
1295 struct record_opts *opts = opt->value;
1296 char *s, *p;
1297 unsigned int mmap_pages;
1298 int ret;
1299
1300 if (!str)
1301 return -EINVAL;
1302
1303 s = strdup(str);
1304 if (!s)
1305 return -ENOMEM;
1306
1307 p = strchr(s, ',');
1308 if (p)
1309 *p = '\0';
1310
1311 if (*s) {
1312 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
1313 if (ret)
1314 goto out_free;
1315 opts->mmap_pages = mmap_pages;
1316 }
1317
1318 if (!p) {
1319 ret = 0;
1320 goto out_free;
1321 }
1322
1323 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
1324 if (ret)
1325 goto out_free;
1326
1327 opts->auxtrace_mmap_pages = mmap_pages;
1328
1329 out_free:
1330 free(s);
1331 return ret;
1332 }
1333
1334 static const char * const __record_usage[] = {
1335 "perf record [<options>] [<command>]",
1336 "perf record [<options>] -- <command> [<options>]",
1337 NULL
1338 };
1339 const char * const *record_usage = __record_usage;
1340
1341 /*
1342 * XXX Ideally would be local to cmd_record() and passed to a record__new
1343 * because we need to have access to it in record__exit, that is called
1344 * after cmd_record() exits, but since record_options need to be accessible to
1345 * builtin-script, leave it here.
1346 *
1347 * At least we don't ouch it in all the other functions here directly.
1348 *
1349 * Just say no to tons of global variables, sigh.
1350 */
1351 static struct record record = {
1352 .opts = {
1353 .sample_time = true,
1354 .mmap_pages = UINT_MAX,
1355 .user_freq = UINT_MAX,
1356 .user_interval = ULLONG_MAX,
1357 .freq = 4000,
1358 .target = {
1359 .uses_mmap = true,
1360 .default_per_cpu = true,
1361 },
1362 .proc_map_timeout = 500,
1363 },
1364 .tool = {
1365 .sample = process_sample_event,
1366 .fork = perf_event__process_fork,
1367 .exit = perf_event__process_exit,
1368 .comm = perf_event__process_comm,
1369 .mmap = perf_event__process_mmap,
1370 .mmap2 = perf_event__process_mmap2,
1371 .ordered_events = true,
1372 },
1373 };
1374
1375 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
1376 "\n\t\t\t\tDefault: fp";
1377
1378 static bool dry_run;
1379
1380 /*
1381 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
1382 * with it and switch to use the library functions in perf_evlist that came
1383 * from builtin-record.c, i.e. use record_opts,
1384 * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
1385 * using pipes, etc.
1386 */
1387 struct option __record_options[] = {
1388 OPT_CALLBACK('e', "event", &record.evlist, "event",
1389 "event selector. use 'perf list' to list available events",
1390 parse_events_option),
1391 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
1392 "event filter", parse_filter),
1393 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
1394 NULL, "don't record events from perf itself",
1395 exclude_perf),
1396 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
1397 "record events on existing process id"),
1398 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
1399 "record events on existing thread id"),
1400 OPT_INTEGER('r', "realtime", &record.realtime_prio,
1401 "collect data with this RT SCHED_FIFO priority"),
1402 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
1403 "collect data without buffering"),
1404 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
1405 "collect raw sample records from all opened counters"),
1406 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
1407 "system-wide collection from all CPUs"),
1408 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
1409 "list of cpus to monitor"),
1410 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
1411 OPT_STRING('o', "output", &record.file.path, "file",
1412 "output file name"),
1413 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
1414 &record.opts.no_inherit_set,
1415 "child tasks do not inherit counters"),
1416 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
1417 "synthesize non-sample events at the end of output"),
1418 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
1419 OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
1420 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
1421 "number of mmap data pages and AUX area tracing mmap pages",
1422 record__parse_mmap_pages),
1423 OPT_BOOLEAN(0, "group", &record.opts.group,
1424 "put the counters into a counter group"),
1425 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1426 NULL, "enables call-graph recording" ,
1427 &record_callchain_opt),
1428 OPT_CALLBACK(0, "call-graph", &record.opts,
1429 "record_mode[,record_size]", record_callchain_help,
1430 &record_parse_callchain_opt),
1431 OPT_INCR('v', "verbose", &verbose,
1432 "be more verbose (show counter open errors, etc)"),
1433 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
1434 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
1435 "per thread counts"),
1436 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
1437 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
1438 &record.opts.sample_time_set,
1439 "Record the sample timestamps"),
1440 OPT_BOOLEAN('P', "period", &record.opts.period, "Record the sample period"),
1441 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
1442 "don't sample"),
1443 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
1444 &record.no_buildid_cache_set,
1445 "do not update the buildid cache"),
1446 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
1447 &record.no_buildid_set,
1448 "do not collect buildids in perf.data"),
1449 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
1450 "monitor event in cgroup name only",
1451 parse_cgroups),
1452 OPT_UINTEGER('D', "delay", &record.opts.initial_delay,
1453 "ms to wait before starting measurement after program start"),
1454 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
1455 "user to profile"),
1456
1457 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
1458 "branch any", "sample any taken branches",
1459 parse_branch_stack),
1460
1461 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
1462 "branch filter mask", "branch stack filter modes",
1463 parse_branch_stack),
1464 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
1465 "sample by weight (on special events only)"),
1466 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
1467 "sample transaction flags (special events only)"),
1468 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
1469 "use per-thread mmaps"),
1470 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
1471 "sample selected machine registers on interrupt,"
1472 " use -I ? to list register names", parse_regs),
1473 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
1474 "Record running/enabled time of read (:S) events"),
1475 OPT_CALLBACK('k', "clockid", &record.opts,
1476 "clockid", "clockid to use for events, see clock_gettime()",
1477 parse_clockid),
1478 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
1479 "opts", "AUX area tracing Snapshot Mode", ""),
1480 OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,
1481 "per thread proc mmap processing timeout in ms"),
1482 OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
1483 "Record context switch events"),
1484 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
1485 "Configure all used events to run in kernel space.",
1486 PARSE_OPT_EXCLUSIVE),
1487 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
1488 "Configure all used events to run in user space.",
1489 PARSE_OPT_EXCLUSIVE),
1490 OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
1491 "clang binary to use for compiling BPF scriptlets"),
1492 OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
1493 "options passed to clang when compiling BPF scriptlets"),
1494 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
1495 "file", "vmlinux pathname"),
1496 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
1497 "Record build-id of all DSOs regardless of hits"),
1498 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
1499 "append timestamp to output filename"),
1500 OPT_BOOLEAN(0, "switch-output", &record.switch_output,
1501 "Switch output when receive SIGUSR2"),
1502 OPT_BOOLEAN(0, "dry-run", &dry_run,
1503 "Parse options then exit"),
1504 OPT_END()
1505 };
1506
1507 struct option *record_options = __record_options;
1508
1509 int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
1510 {
1511 int err;
1512 struct record *rec = &record;
1513 char errbuf[BUFSIZ];
1514
1515 #ifndef HAVE_LIBBPF_SUPPORT
1516 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
1517 set_nobuild('\0', "clang-path", true);
1518 set_nobuild('\0', "clang-opt", true);
1519 # undef set_nobuild
1520 #endif
1521
1522 #ifndef HAVE_BPF_PROLOGUE
1523 # if !defined (HAVE_DWARF_SUPPORT)
1524 # define REASON "NO_DWARF=1"
1525 # elif !defined (HAVE_LIBBPF_SUPPORT)
1526 # define REASON "NO_LIBBPF=1"
1527 # else
1528 # define REASON "this architecture doesn't support BPF prologue"
1529 # endif
1530 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
1531 set_nobuild('\0', "vmlinux", true);
1532 # undef set_nobuild
1533 # undef REASON
1534 #endif
1535
1536 rec->evlist = perf_evlist__new();
1537 if (rec->evlist == NULL)
1538 return -ENOMEM;
1539
1540 perf_config(perf_record_config, rec);
1541
1542 argc = parse_options(argc, argv, record_options, record_usage,
1543 PARSE_OPT_STOP_AT_NON_OPTION);
1544 if (!argc && target__none(&rec->opts.target))
1545 usage_with_options(record_usage, record_options);
1546
1547 if (nr_cgroups && !rec->opts.target.system_wide) {
1548 usage_with_options_msg(record_usage, record_options,
1549 "cgroup monitoring only available in system-wide mode");
1550
1551 }
1552 if (rec->opts.record_switch_events &&
1553 !perf_can_record_switch_events()) {
1554 ui__error("kernel does not support recording context switch events\n");
1555 parse_options_usage(record_usage, record_options, "switch-events", 0);
1556 return -EINVAL;
1557 }
1558
1559 if (rec->switch_output)
1560 rec->timestamp_filename = true;
1561
1562 if (!rec->itr) {
1563 rec->itr = auxtrace_record__init(rec->evlist, &err);
1564 if (err)
1565 return err;
1566 }
1567
1568 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
1569 rec->opts.auxtrace_snapshot_opts);
1570 if (err)
1571 return err;
1572
1573 if (dry_run)
1574 return 0;
1575
1576 err = bpf__setup_stdout(rec->evlist);
1577 if (err) {
1578 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
1579 pr_err("ERROR: Setup BPF stdout failed: %s\n",
1580 errbuf);
1581 return err;
1582 }
1583
1584 err = -ENOMEM;
1585
1586 symbol__init(NULL);
1587
1588 if (symbol_conf.kptr_restrict)
1589 pr_warning(
1590 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
1591 "check /proc/sys/kernel/kptr_restrict.\n\n"
1592 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
1593 "file is not found in the buildid cache or in the vmlinux path.\n\n"
1594 "Samples in kernel modules won't be resolved at all.\n\n"
1595 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1596 "even with a suitable vmlinux or kallsyms file.\n\n");
1597
1598 if (rec->no_buildid_cache || rec->no_buildid) {
1599 disable_buildid_cache();
1600 } else if (rec->switch_output) {
1601 /*
1602 * In 'perf record --switch-output', disable buildid
1603 * generation by default to reduce data file switching
1604 * overhead. Still generate buildid if they are required
1605 * explicitly using
1606 *
1607 * perf record --signal-trigger --no-no-buildid \
1608 * --no-no-buildid-cache
1609 *
1610 * Following code equals to:
1611 *
1612 * if ((rec->no_buildid || !rec->no_buildid_set) &&
1613 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
1614 * disable_buildid_cache();
1615 */
1616 bool disable = true;
1617
1618 if (rec->no_buildid_set && !rec->no_buildid)
1619 disable = false;
1620 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
1621 disable = false;
1622 if (disable) {
1623 rec->no_buildid = true;
1624 rec->no_buildid_cache = true;
1625 disable_buildid_cache();
1626 }
1627 }
1628
1629 if (record.opts.overwrite)
1630 record.opts.tail_synthesize = true;
1631
1632 if (rec->evlist->nr_entries == 0 &&
1633 perf_evlist__add_default(rec->evlist) < 0) {
1634 pr_err("Not enough memory for event selector list\n");
1635 goto out_symbol_exit;
1636 }
1637
1638 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
1639 rec->opts.no_inherit = true;
1640
1641 err = target__validate(&rec->opts.target);
1642 if (err) {
1643 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1644 ui__warning("%s", errbuf);
1645 }
1646
1647 err = target__parse_uid(&rec->opts.target);
1648 if (err) {
1649 int saved_errno = errno;
1650
1651 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1652 ui__error("%s", errbuf);
1653
1654 err = -saved_errno;
1655 goto out_symbol_exit;
1656 }
1657
1658 err = -ENOMEM;
1659 if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
1660 usage_with_options(record_usage, record_options);
1661
1662 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
1663 if (err)
1664 goto out_symbol_exit;
1665
1666 /*
1667 * We take all buildids when the file contains
1668 * AUX area tracing data because we do not decode the
1669 * trace because it would take too long.
1670 */
1671 if (rec->opts.full_auxtrace)
1672 rec->buildid_all = true;
1673
1674 if (record_opts__config(&rec->opts)) {
1675 err = -EINVAL;
1676 goto out_symbol_exit;
1677 }
1678
1679 err = __cmd_record(&record, argc, argv);
1680 out_symbol_exit:
1681 perf_evlist__delete(rec->evlist);
1682 symbol__exit();
1683 auxtrace_record__free(rec->itr);
1684 return err;
1685 }
1686
1687 static void snapshot_sig_handler(int sig __maybe_unused)
1688 {
1689 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
1690 trigger_hit(&auxtrace_snapshot_trigger);
1691 auxtrace_record__snapshot_started = 1;
1692 if (auxtrace_record__snapshot_start(record.itr))
1693 trigger_error(&auxtrace_snapshot_trigger);
1694 }
1695
1696 if (trigger_is_ready(&switch_output_trigger))
1697 trigger_hit(&switch_output_trigger);
1698 }
Linux kernel - Deliverables
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