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powerpc/mm/4k: don't allocate larger pmd page table for 4k
[linux/fpc-iii.git] / tools / perf / builtin-record.c
blob4ec10e9427d915a041e0510eaac2ded2daf9fc07
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/drv_configs.h"
26 #include "util/session.h"
27 #include "util/tool.h"
28 #include "util/symbol.h"
29 #include "util/cpumap.h"
30 #include "util/thread_map.h"
31 #include "util/data.h"
32 #include "util/perf_regs.h"
33 #include "util/auxtrace.h"
34 #include "util/tsc.h"
35 #include "util/parse-branch-options.h"
36 #include "util/parse-regs-options.h"
37 #include "util/llvm-utils.h"
38 #include "util/bpf-loader.h"
39 #include "util/trigger.h"
40 #include "util/perf-hooks.h"
41 #include "asm/bug.h"
42
43 #include <unistd.h>
44 #include <sched.h>
45 #include <sys/mman.h>
46 #include <asm/bug.h>
47 #include <linux/time64.h>
48
49 struct record {
50 struct perf_tool tool;
51 struct record_opts opts;
52 u64 bytes_written;
53 struct perf_data_file file;
54 struct auxtrace_record *itr;
55 struct perf_evlist *evlist;
56 struct perf_session *session;
57 const char *progname;
58 int realtime_prio;
59 bool no_buildid;
60 bool no_buildid_set;
61 bool no_buildid_cache;
62 bool no_buildid_cache_set;
63 bool buildid_all;
64 bool timestamp_filename;
65 bool switch_output;
66 unsigned long long samples;
67 };
68
69 static int record__write(struct record *rec, void *bf, size_t size)
70 {
71 if (perf_data_file__write(rec->session->file, bf, size) < 0) {
72 pr_err("failed to write perf data, error: %m\n");
73 return -1;
74 }
75
76 rec->bytes_written += size;
77 return 0;
78 }
79
80 static int process_synthesized_event(struct perf_tool *tool,
81 union perf_event *event,
82 struct perf_sample *sample __maybe_unused,
83 struct machine *machine __maybe_unused)
84 {
85 struct record *rec = container_of(tool, struct record, tool);
86 return record__write(rec, event, event->header.size);
87 }
88
89 static int
90 backward_rb_find_range(void *buf, int mask, u64 head, u64 *start, u64 *end)
91 {
92 struct perf_event_header *pheader;
93 u64 evt_head = head;
94 int size = mask + 1;
95
96 pr_debug2("backward_rb_find_range: buf=%p, head=%"PRIx64"\n", buf, head);
97 pheader = (struct perf_event_header *)(buf + (head & mask));
98 *start = head;
99 while (true) {
100 if (evt_head - head >= (unsigned int)size) {
101 pr_debug("Finished reading backward ring buffer: rewind\n");
102 if (evt_head - head > (unsigned int)size)
103 evt_head -= pheader->size;
104 *end = evt_head;
105 return 0;
106 }
107
108 pheader = (struct perf_event_header *)(buf + (evt_head & mask));
109
110 if (pheader->size == 0) {
111 pr_debug("Finished reading backward ring buffer: get start\n");
112 *end = evt_head;
113 return 0;
114 }
115
116 evt_head += pheader->size;
117 pr_debug3("move evt_head: %"PRIx64"\n", evt_head);
118 }
119 WARN_ONCE(1, "Shouldn't get here\n");
120 return -1;
121 }
122
123 static int
124 rb_find_range(void *data, int mask, u64 head, u64 old,
125 u64 *start, u64 *end, bool backward)
126 {
127 if (!backward) {
128 *start = old;
129 *end = head;
130 return 0;
131 }
132
133 return backward_rb_find_range(data, mask, head, start, end);
134 }
135
136 static int
137 record__mmap_read(struct record *rec, struct perf_mmap *md,
138 bool overwrite, bool backward)
139 {
140 u64 head = perf_mmap__read_head(md);
141 u64 old = md->prev;
142 u64 end = head, start = old;
143 unsigned char *data = md->base + page_size;
144 unsigned long size;
145 void *buf;
146 int rc = 0;
147
148 if (rb_find_range(data, md->mask, head,
149 old, &start, &end, backward))
150 return -1;
151
152 if (start == end)
153 return 0;
154
155 rec->samples++;
156
157 size = end - start;
158 if (size > (unsigned long)(md->mask) + 1) {
159 WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
160
161 md->prev = head;
162 perf_mmap__consume(md, overwrite || backward);
163 return 0;
164 }
165
166 if ((start & md->mask) + size != (end & md->mask)) {
167 buf = &data[start & md->mask];
168 size = md->mask + 1 - (start & md->mask);
169 start += size;
170
171 if (record__write(rec, buf, size) < 0) {
172 rc = -1;
173 goto out;
174 }
175 }
176
177 buf = &data[start & md->mask];
178 size = end - start;
179 start += size;
180
181 if (record__write(rec, buf, size) < 0) {
182 rc = -1;
183 goto out;
184 }
185
186 md->prev = head;
187 perf_mmap__consume(md, overwrite || backward);
188 out:
189 return rc;
190 }
191
192 static volatile int done;
193 static volatile int signr = -1;
194 static volatile int child_finished;
195
196 static volatile int auxtrace_record__snapshot_started;
197 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
198 static DEFINE_TRIGGER(switch_output_trigger);
199
200 static void sig_handler(int sig)
201 {
202 if (sig == SIGCHLD)
203 child_finished = 1;
204 else
205 signr = sig;
206
207 done = 1;
208 }
209
210 static void sigsegv_handler(int sig)
211 {
212 perf_hooks__recover();
213 sighandler_dump_stack(sig);
214 }
215
216 static void record__sig_exit(void)
217 {
218 if (signr == -1)
219 return;
220
221 signal(signr, SIG_DFL);
222 raise(signr);
223 }
224
225 #ifdef HAVE_AUXTRACE_SUPPORT
226
227 static int record__process_auxtrace(struct perf_tool *tool,
228 union perf_event *event, void *data1,
229 size_t len1, void *data2, size_t len2)
230 {
231 struct record *rec = container_of(tool, struct record, tool);
232 struct perf_data_file *file = &rec->file;
233 size_t padding;
234 u8 pad[8] = {0};
235
236 if (!perf_data_file__is_pipe(file)) {
237 off_t file_offset;
238 int fd = perf_data_file__fd(file);
239 int err;
240
241 file_offset = lseek(fd, 0, SEEK_CUR);
242 if (file_offset == -1)
243 return -1;
244 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
245 event, file_offset);
246 if (err)
247 return err;
248 }
249
250 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
251 padding = (len1 + len2) & 7;
252 if (padding)
253 padding = 8 - padding;
254
255 record__write(rec, event, event->header.size);
256 record__write(rec, data1, len1);
257 if (len2)
258 record__write(rec, data2, len2);
259 record__write(rec, &pad, padding);
260
261 return 0;
262 }
263
264 static int record__auxtrace_mmap_read(struct record *rec,
265 struct auxtrace_mmap *mm)
266 {
267 int ret;
268
269 ret = auxtrace_mmap__read(mm, rec->itr, &rec->tool,
270 record__process_auxtrace);
271 if (ret < 0)
272 return ret;
273
274 if (ret)
275 rec->samples++;
276
277 return 0;
278 }
279
280 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
281 struct auxtrace_mmap *mm)
282 {
283 int ret;
284
285 ret = auxtrace_mmap__read_snapshot(mm, rec->itr, &rec->tool,
286 record__process_auxtrace,
287 rec->opts.auxtrace_snapshot_size);
288 if (ret < 0)
289 return ret;
290
291 if (ret)
292 rec->samples++;
293
294 return 0;
295 }
296
297 static int record__auxtrace_read_snapshot_all(struct record *rec)
298 {
299 int i;
300 int rc = 0;
301
302 for (i = 0; i < rec->evlist->nr_mmaps; i++) {
303 struct auxtrace_mmap *mm =
304 &rec->evlist->mmap[i].auxtrace_mmap;
305
306 if (!mm->base)
307 continue;
308
309 if (record__auxtrace_mmap_read_snapshot(rec, mm) != 0) {
310 rc = -1;
311 goto out;
312 }
313 }
314 out:
315 return rc;
316 }
317
318 static void record__read_auxtrace_snapshot(struct record *rec)
319 {
320 pr_debug("Recording AUX area tracing snapshot\n");
321 if (record__auxtrace_read_snapshot_all(rec) < 0) {
322 trigger_error(&auxtrace_snapshot_trigger);
323 } else {
324 if (auxtrace_record__snapshot_finish(rec->itr))
325 trigger_error(&auxtrace_snapshot_trigger);
326 else
327 trigger_ready(&auxtrace_snapshot_trigger);
328 }
329 }
330
331 #else
332
333 static inline
334 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
335 struct auxtrace_mmap *mm __maybe_unused)
336 {
337 return 0;
338 }
339
340 static inline
341 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused)
342 {
343 }
344
345 static inline
346 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
347 {
348 return 0;
349 }
350
351 #endif
352
353 static int record__mmap_evlist(struct record *rec,
354 struct perf_evlist *evlist)
355 {
356 struct record_opts *opts = &rec->opts;
357 char msg[512];
358
359 if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
360 opts->auxtrace_mmap_pages,
361 opts->auxtrace_snapshot_mode) < 0) {
362 if (errno == EPERM) {
363 pr_err("Permission error mapping pages.\n"
364 "Consider increasing "
365 "/proc/sys/kernel/perf_event_mlock_kb,\n"
366 "or try again with a smaller value of -m/--mmap_pages.\n"
367 "(current value: %u,%u)\n",
368 opts->mmap_pages, opts->auxtrace_mmap_pages);
369 return -errno;
370 } else {
371 pr_err("failed to mmap with %d (%s)\n", errno,
372 str_error_r(errno, msg, sizeof(msg)));
373 if (errno)
374 return -errno;
375 else
376 return -EINVAL;
377 }
378 }
379 return 0;
380 }
381
382 static int record__mmap(struct record *rec)
383 {
384 return record__mmap_evlist(rec, rec->evlist);
385 }
386
387 static int record__open(struct record *rec)
388 {
389 char msg[512];
390 struct perf_evsel *pos;
391 struct perf_evlist *evlist = rec->evlist;
392 struct perf_session *session = rec->session;
393 struct record_opts *opts = &rec->opts;
394 struct perf_evsel_config_term *err_term;
395 int rc = 0;
396
397 perf_evlist__config(evlist, opts, &callchain_param);
398
399 evlist__for_each_entry(evlist, pos) {
400 try_again:
401 if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) {
402 if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
403 if (verbose)
404 ui__warning("%s\n", msg);
405 goto try_again;
406 }
407
408 rc = -errno;
409 perf_evsel__open_strerror(pos, &opts->target,
410 errno, msg, sizeof(msg));
411 ui__error("%s\n", msg);
412 goto out;
413 }
414 }
415
416 if (perf_evlist__apply_filters(evlist, &pos)) {
417 error("failed to set filter \"%s\" on event %s with %d (%s)\n",
418 pos->filter, perf_evsel__name(pos), errno,
419 str_error_r(errno, msg, sizeof(msg)));
420 rc = -1;
421 goto out;
422 }
423
424 if (perf_evlist__apply_drv_configs(evlist, &pos, &err_term)) {
425 error("failed to set config \"%s\" on event %s with %d (%s)\n",
426 err_term->val.drv_cfg, perf_evsel__name(pos), errno,
427 str_error_r(errno, msg, sizeof(msg)));
428 rc = -1;
429 goto out;
430 }
431
432 rc = record__mmap(rec);
433 if (rc)
434 goto out;
435
436 session->evlist = evlist;
437 perf_session__set_id_hdr_size(session);
438 out:
439 return rc;
440 }
441
442 static int process_sample_event(struct perf_tool *tool,
443 union perf_event *event,
444 struct perf_sample *sample,
445 struct perf_evsel *evsel,
446 struct machine *machine)
447 {
448 struct record *rec = container_of(tool, struct record, tool);
449
450 rec->samples++;
451
452 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
453 }
454
455 static int process_buildids(struct record *rec)
456 {
457 struct perf_data_file *file = &rec->file;
458 struct perf_session *session = rec->session;
459
460 if (file->size == 0)
461 return 0;
462
463 /*
464 * During this process, it'll load kernel map and replace the
465 * dso->long_name to a real pathname it found. In this case
466 * we prefer the vmlinux path like
467 * /lib/modules/3.16.4/build/vmlinux
468 *
469 * rather than build-id path (in debug directory).
470 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
471 */
472 symbol_conf.ignore_vmlinux_buildid = true;
473
474 /*
475 * If --buildid-all is given, it marks all DSO regardless of hits,
476 * so no need to process samples.
477 */
478 if (rec->buildid_all)
479 rec->tool.sample = NULL;
480
481 return perf_session__process_events(session);
482 }
483
484 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
485 {
486 int err;
487 struct perf_tool *tool = data;
488 /*
489 *As for guest kernel when processing subcommand record&report,
490 *we arrange module mmap prior to guest kernel mmap and trigger
491 *a preload dso because default guest module symbols are loaded
492 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
493 *method is used to avoid symbol missing when the first addr is
494 *in module instead of in guest kernel.
495 */
496 err = perf_event__synthesize_modules(tool, process_synthesized_event,
497 machine);
498 if (err < 0)
499 pr_err("Couldn't record guest kernel [%d]'s reference"
500 " relocation symbol.\n", machine->pid);
501
502 /*
503 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
504 * have no _text sometimes.
505 */
506 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
507 machine);
508 if (err < 0)
509 pr_err("Couldn't record guest kernel [%d]'s reference"
510 " relocation symbol.\n", machine->pid);
511 }
512
513 static struct perf_event_header finished_round_event = {
514 .size = sizeof(struct perf_event_header),
515 .type = PERF_RECORD_FINISHED_ROUND,
516 };
517
518 static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evlist,
519 bool backward)
520 {
521 u64 bytes_written = rec->bytes_written;
522 int i;
523 int rc = 0;
524 struct perf_mmap *maps;
525
526 if (!evlist)
527 return 0;
528
529 maps = backward ? evlist->backward_mmap : evlist->mmap;
530 if (!maps)
531 return 0;
532
533 if (backward && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
534 return 0;
535
536 for (i = 0; i < evlist->nr_mmaps; i++) {
537 struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap;
538
539 if (maps[i].base) {
540 if (record__mmap_read(rec, &maps[i],
541 evlist->overwrite, backward) != 0) {
542 rc = -1;
543 goto out;
544 }
545 }
546
547 if (mm->base && !rec->opts.auxtrace_snapshot_mode &&
548 record__auxtrace_mmap_read(rec, mm) != 0) {
549 rc = -1;
550 goto out;
551 }
552 }
553
554 /*
555 * Mark the round finished in case we wrote
556 * at least one event.
557 */
558 if (bytes_written != rec->bytes_written)
559 rc = record__write(rec, &finished_round_event, sizeof(finished_round_event));
560
561 if (backward)
562 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
563 out:
564 return rc;
565 }
566
567 static int record__mmap_read_all(struct record *rec)
568 {
569 int err;
570
571 err = record__mmap_read_evlist(rec, rec->evlist, false);
572 if (err)
573 return err;
574
575 return record__mmap_read_evlist(rec, rec->evlist, true);
576 }
577
578 static void record__init_features(struct record *rec)
579 {
580 struct perf_session *session = rec->session;
581 int feat;
582
583 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
584 perf_header__set_feat(&session->header, feat);
585
586 if (rec->no_buildid)
587 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
588
589 if (!have_tracepoints(&rec->evlist->entries))
590 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
591
592 if (!rec->opts.branch_stack)
593 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
594
595 if (!rec->opts.full_auxtrace)
596 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
597
598 perf_header__clear_feat(&session->header, HEADER_STAT);
599 }
600
601 static void
602 record__finish_output(struct record *rec)
603 {
604 struct perf_data_file *file = &rec->file;
605 int fd = perf_data_file__fd(file);
606
607 if (file->is_pipe)
608 return;
609
610 rec->session->header.data_size += rec->bytes_written;
611 file->size = lseek(perf_data_file__fd(file), 0, SEEK_CUR);
612
613 if (!rec->no_buildid) {
614 process_buildids(rec);
615
616 if (rec->buildid_all)
617 dsos__hit_all(rec->session);
618 }
619 perf_session__write_header(rec->session, rec->evlist, fd, true);
620
621 return;
622 }
623
624 static int record__synthesize_workload(struct record *rec, bool tail)
625 {
626 struct {
627 struct thread_map map;
628 struct thread_map_data map_data;
629 } thread_map;
630
631 if (rec->opts.tail_synthesize != tail)
632 return 0;
633
634 thread_map.map.nr = 1;
635 thread_map.map.map[0].pid = rec->evlist->workload.pid;
636 thread_map.map.map[0].comm = NULL;
637 return perf_event__synthesize_thread_map(&rec->tool, &thread_map.map,
638 process_synthesized_event,
639 &rec->session->machines.host,
640 rec->opts.sample_address,
641 rec->opts.proc_map_timeout);
642 }
643
644 static int record__synthesize(struct record *rec, bool tail);
645
646 static int
647 record__switch_output(struct record *rec, bool at_exit)
648 {
649 struct perf_data_file *file = &rec->file;
650 int fd, err;
651
652 /* Same Size: "2015122520103046"*/
653 char timestamp[] = "InvalidTimestamp";
654
655 record__synthesize(rec, true);
656 if (target__none(&rec->opts.target))
657 record__synthesize_workload(rec, true);
658
659 rec->samples = 0;
660 record__finish_output(rec);
661 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
662 if (err) {
663 pr_err("Failed to get current timestamp\n");
664 return -EINVAL;
665 }
666
667 fd = perf_data_file__switch(file, timestamp,
668 rec->session->header.data_offset,
669 at_exit);
670 if (fd >= 0 && !at_exit) {
671 rec->bytes_written = 0;
672 rec->session->header.data_size = 0;
673 }
674
675 if (!quiet)
676 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
677 file->path, timestamp);
678
679 /* Output tracking events */
680 if (!at_exit) {
681 record__synthesize(rec, false);
682
683 /*
684 * In 'perf record --switch-output' without -a,
685 * record__synthesize() in record__switch_output() won't
686 * generate tracking events because there's no thread_map
687 * in evlist. Which causes newly created perf.data doesn't
688 * contain map and comm information.
689 * Create a fake thread_map and directly call
690 * perf_event__synthesize_thread_map() for those events.
691 */
692 if (target__none(&rec->opts.target))
693 record__synthesize_workload(rec, false);
694 }
695 return fd;
696 }
697
698 static volatile int workload_exec_errno;
699
700 /*
701 * perf_evlist__prepare_workload will send a SIGUSR1
702 * if the fork fails, since we asked by setting its
703 * want_signal to true.
704 */
705 static void workload_exec_failed_signal(int signo __maybe_unused,
706 siginfo_t *info,
707 void *ucontext __maybe_unused)
708 {
709 workload_exec_errno = info->si_value.sival_int;
710 done = 1;
711 child_finished = 1;
712 }
713
714 static void snapshot_sig_handler(int sig);
715
716 int __weak
717 perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
718 struct perf_tool *tool __maybe_unused,
719 perf_event__handler_t process __maybe_unused,
720 struct machine *machine __maybe_unused)
721 {
722 return 0;
723 }
724
725 static const struct perf_event_mmap_page *
726 perf_evlist__pick_pc(struct perf_evlist *evlist)
727 {
728 if (evlist) {
729 if (evlist->mmap && evlist->mmap[0].base)
730 return evlist->mmap[0].base;
731 if (evlist->backward_mmap && evlist->backward_mmap[0].base)
732 return evlist->backward_mmap[0].base;
733 }
734 return NULL;
735 }
736
737 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
738 {
739 const struct perf_event_mmap_page *pc;
740
741 pc = perf_evlist__pick_pc(rec->evlist);
742 if (pc)
743 return pc;
744 return NULL;
745 }
746
747 static int record__synthesize(struct record *rec, bool tail)
748 {
749 struct perf_session *session = rec->session;
750 struct machine *machine = &session->machines.host;
751 struct perf_data_file *file = &rec->file;
752 struct record_opts *opts = &rec->opts;
753 struct perf_tool *tool = &rec->tool;
754 int fd = perf_data_file__fd(file);
755 int err = 0;
756
757 if (rec->opts.tail_synthesize != tail)
758 return 0;
759
760 if (file->is_pipe) {
761 err = perf_event__synthesize_attrs(tool, session,
762 process_synthesized_event);
763 if (err < 0) {
764 pr_err("Couldn't synthesize attrs.\n");
765 goto out;
766 }
767
768 if (have_tracepoints(&rec->evlist->entries)) {
769 /*
770 * FIXME err <= 0 here actually means that
771 * there were no tracepoints so its not really
772 * an error, just that we don't need to
773 * synthesize anything. We really have to
774 * return this more properly and also
775 * propagate errors that now are calling die()
776 */
777 err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
778 process_synthesized_event);
779 if (err <= 0) {
780 pr_err("Couldn't record tracing data.\n");
781 goto out;
782 }
783 rec->bytes_written += err;
784 }
785 }
786
787 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
788 process_synthesized_event, machine);
789 if (err)
790 goto out;
791
792 if (rec->opts.full_auxtrace) {
793 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
794 session, process_synthesized_event);
795 if (err)
796 goto out;
797 }
798
799 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
800 machine);
801 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
802 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
803 "Check /proc/kallsyms permission or run as root.\n");
804
805 err = perf_event__synthesize_modules(tool, process_synthesized_event,
806 machine);
807 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
808 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
809 "Check /proc/modules permission or run as root.\n");
810
811 if (perf_guest) {
812 machines__process_guests(&session->machines,
813 perf_event__synthesize_guest_os, tool);
814 }
815
816 err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
817 process_synthesized_event, opts->sample_address,
818 opts->proc_map_timeout);
819 out:
820 return err;
821 }
822
823 static int __cmd_record(struct record *rec, int argc, const char **argv)
824 {
825 int err;
826 int status = 0;
827 unsigned long waking = 0;
828 const bool forks = argc > 0;
829 struct machine *machine;
830 struct perf_tool *tool = &rec->tool;
831 struct record_opts *opts = &rec->opts;
832 struct perf_data_file *file = &rec->file;
833 struct perf_session *session;
834 bool disabled = false, draining = false;
835 int fd;
836
837 rec->progname = argv[0];
838
839 atexit(record__sig_exit);
840 signal(SIGCHLD, sig_handler);
841 signal(SIGINT, sig_handler);
842 signal(SIGTERM, sig_handler);
843 signal(SIGSEGV, sigsegv_handler);
844
845 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output) {
846 signal(SIGUSR2, snapshot_sig_handler);
847 if (rec->opts.auxtrace_snapshot_mode)
848 trigger_on(&auxtrace_snapshot_trigger);
849 if (rec->switch_output)
850 trigger_on(&switch_output_trigger);
851 } else {
852 signal(SIGUSR2, SIG_IGN);
853 }
854
855 session = perf_session__new(file, false, tool);
856 if (session == NULL) {
857 pr_err("Perf session creation failed.\n");
858 return -1;
859 }
860
861 fd = perf_data_file__fd(file);
862 rec->session = session;
863
864 record__init_features(rec);
865
866 if (forks) {
867 err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
868 argv, file->is_pipe,
869 workload_exec_failed_signal);
870 if (err < 0) {
871 pr_err("Couldn't run the workload!\n");
872 status = err;
873 goto out_delete_session;
874 }
875 }
876
877 if (record__open(rec) != 0) {
878 err = -1;
879 goto out_child;
880 }
881
882 err = bpf__apply_obj_config();
883 if (err) {
884 char errbuf[BUFSIZ];
885
886 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
887 pr_err("ERROR: Apply config to BPF failed: %s\n",
888 errbuf);
889 goto out_child;
890 }
891
892 /*
893 * Normally perf_session__new would do this, but it doesn't have the
894 * evlist.
895 */
896 if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) {
897 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
898 rec->tool.ordered_events = false;
899 }
900
901 if (!rec->evlist->nr_groups)
902 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
903
904 if (file->is_pipe) {
905 err = perf_header__write_pipe(fd);
906 if (err < 0)
907 goto out_child;
908 } else {
909 err = perf_session__write_header(session, rec->evlist, fd, false);
910 if (err < 0)
911 goto out_child;
912 }
913
914 if (!rec->no_buildid
915 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
916 pr_err("Couldn't generate buildids. "
917 "Use --no-buildid to profile anyway.\n");
918 err = -1;
919 goto out_child;
920 }
921
922 machine = &session->machines.host;
923
924 err = record__synthesize(rec, false);
925 if (err < 0)
926 goto out_child;
927
928 if (rec->realtime_prio) {
929 struct sched_param param;
930
931 param.sched_priority = rec->realtime_prio;
932 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
933 pr_err("Could not set realtime priority.\n");
934 err = -1;
935 goto out_child;
936 }
937 }
938
939 /*
940 * When perf is starting the traced process, all the events
941 * (apart from group members) have enable_on_exec=1 set,
942 * so don't spoil it by prematurely enabling them.
943 */
944 if (!target__none(&opts->target) && !opts->initial_delay)
945 perf_evlist__enable(rec->evlist);
946
947 /*
948 * Let the child rip
949 */
950 if (forks) {
951 union perf_event *event;
952
953 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
954 if (event == NULL) {
955 err = -ENOMEM;
956 goto out_child;
957 }
958
959 /*
960 * Some H/W events are generated before COMM event
961 * which is emitted during exec(), so perf script
962 * cannot see a correct process name for those events.
963 * Synthesize COMM event to prevent it.
964 */
965 perf_event__synthesize_comm(tool, event,
966 rec->evlist->workload.pid,
967 process_synthesized_event,
968 machine);
969 free(event);
970
971 perf_evlist__start_workload(rec->evlist);
972 }
973
974 if (opts->initial_delay) {
975 usleep(opts->initial_delay * USEC_PER_MSEC);
976 perf_evlist__enable(rec->evlist);
977 }
978
979 trigger_ready(&auxtrace_snapshot_trigger);
980 trigger_ready(&switch_output_trigger);
981 perf_hooks__invoke_record_start();
982 for (;;) {
983 unsigned long long hits = rec->samples;
984
985 /*
986 * rec->evlist->bkw_mmap_state is possible to be
987 * BKW_MMAP_EMPTY here: when done == true and
988 * hits != rec->samples in previous round.
989 *
990 * perf_evlist__toggle_bkw_mmap ensure we never
991 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
992 */
993 if (trigger_is_hit(&switch_output_trigger) || done || draining)
994 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
995
996 if (record__mmap_read_all(rec) < 0) {
997 trigger_error(&auxtrace_snapshot_trigger);
998 trigger_error(&switch_output_trigger);
999 err = -1;
1000 goto out_child;
1001 }
1002
1003 if (auxtrace_record__snapshot_started) {
1004 auxtrace_record__snapshot_started = 0;
1005 if (!trigger_is_error(&auxtrace_snapshot_trigger))
1006 record__read_auxtrace_snapshot(rec);
1007 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1008 pr_err("AUX area tracing snapshot failed\n");
1009 err = -1;
1010 goto out_child;
1011 }
1012 }
1013
1014 if (trigger_is_hit(&switch_output_trigger)) {
1015 /*
1016 * If switch_output_trigger is hit, the data in
1017 * overwritable ring buffer should have been collected,
1018 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1019 *
1020 * If SIGUSR2 raise after or during record__mmap_read_all(),
1021 * record__mmap_read_all() didn't collect data from
1022 * overwritable ring buffer. Read again.
1023 */
1024 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1025 continue;
1026 trigger_ready(&switch_output_trigger);
1027
1028 /*
1029 * Reenable events in overwrite ring buffer after
1030 * record__mmap_read_all(): we should have collected
1031 * data from it.
1032 */
1033 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1034
1035 if (!quiet)
1036 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1037 waking);
1038 waking = 0;
1039 fd = record__switch_output(rec, false);
1040 if (fd < 0) {
1041 pr_err("Failed to switch to new file\n");
1042 trigger_error(&switch_output_trigger);
1043 err = fd;
1044 goto out_child;
1045 }
1046 }
1047
1048 if (hits == rec->samples) {
1049 if (done || draining)
1050 break;
1051 err = perf_evlist__poll(rec->evlist, -1);
1052 /*
1053 * Propagate error, only if there's any. Ignore positive
1054 * number of returned events and interrupt error.
1055 */
1056 if (err > 0 || (err < 0 && errno == EINTR))
1057 err = 0;
1058 waking++;
1059
1060 if (perf_evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1061 draining = true;
1062 }
1063
1064 /*
1065 * When perf is starting the traced process, at the end events
1066 * die with the process and we wait for that. Thus no need to
1067 * disable events in this case.
1068 */
1069 if (done && !disabled && !target__none(&opts->target)) {
1070 trigger_off(&auxtrace_snapshot_trigger);
1071 perf_evlist__disable(rec->evlist);
1072 disabled = true;
1073 }
1074 }
1075 trigger_off(&auxtrace_snapshot_trigger);
1076 trigger_off(&switch_output_trigger);
1077
1078 if (forks && workload_exec_errno) {
1079 char msg[STRERR_BUFSIZE];
1080 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1081 pr_err("Workload failed: %s\n", emsg);
1082 err = -1;
1083 goto out_child;
1084 }
1085
1086 if (!quiet)
1087 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1088
1089 if (target__none(&rec->opts.target))
1090 record__synthesize_workload(rec, true);
1091
1092 out_child:
1093 if (forks) {
1094 int exit_status;
1095
1096 if (!child_finished)
1097 kill(rec->evlist->workload.pid, SIGTERM);
1098
1099 wait(&exit_status);
1100
1101 if (err < 0)
1102 status = err;
1103 else if (WIFEXITED(exit_status))
1104 status = WEXITSTATUS(exit_status);
1105 else if (WIFSIGNALED(exit_status))
1106 signr = WTERMSIG(exit_status);
1107 } else
1108 status = err;
1109
1110 record__synthesize(rec, true);
1111 /* this will be recalculated during process_buildids() */
1112 rec->samples = 0;
1113
1114 if (!err) {
1115 if (!rec->timestamp_filename) {
1116 record__finish_output(rec);
1117 } else {
1118 fd = record__switch_output(rec, true);
1119 if (fd < 0) {
1120 status = fd;
1121 goto out_delete_session;
1122 }
1123 }
1124 }
1125
1126 perf_hooks__invoke_record_end();
1127
1128 if (!err && !quiet) {
1129 char samples[128];
1130 const char *postfix = rec->timestamp_filename ?
1131 ".<timestamp>" : "";
1132
1133 if (rec->samples && !rec->opts.full_auxtrace)
1134 scnprintf(samples, sizeof(samples),
1135 " (%" PRIu64 " samples)", rec->samples);
1136 else
1137 samples[0] = '\0';
1138
1139 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
1140 perf_data_file__size(file) / 1024.0 / 1024.0,
1141 file->path, postfix, samples);
1142 }
1143
1144 out_delete_session:
1145 perf_session__delete(session);
1146 return status;
1147 }
1148
1149 static void callchain_debug(struct callchain_param *callchain)
1150 {
1151 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
1152
1153 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
1154
1155 if (callchain->record_mode == CALLCHAIN_DWARF)
1156 pr_debug("callchain: stack dump size %d\n",
1157 callchain->dump_size);
1158 }
1159
1160 int record_opts__parse_callchain(struct record_opts *record,
1161 struct callchain_param *callchain,
1162 const char *arg, bool unset)
1163 {
1164 int ret;
1165 callchain->enabled = !unset;
1166
1167 /* --no-call-graph */
1168 if (unset) {
1169 callchain->record_mode = CALLCHAIN_NONE;
1170 pr_debug("callchain: disabled\n");
1171 return 0;
1172 }
1173
1174 ret = parse_callchain_record_opt(arg, callchain);
1175 if (!ret) {
1176 /* Enable data address sampling for DWARF unwind. */
1177 if (callchain->record_mode == CALLCHAIN_DWARF)
1178 record->sample_address = true;
1179 callchain_debug(callchain);
1180 }
1181
1182 return ret;
1183 }
1184
1185 int record_parse_callchain_opt(const struct option *opt,
1186 const char *arg,
1187 int unset)
1188 {
1189 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
1190 }
1191
1192 int record_callchain_opt(const struct option *opt,
1193 const char *arg __maybe_unused,
1194 int unset __maybe_unused)
1195 {
1196 struct callchain_param *callchain = opt->value;
1197
1198 callchain->enabled = true;
1199
1200 if (callchain->record_mode == CALLCHAIN_NONE)
1201 callchain->record_mode = CALLCHAIN_FP;
1202
1203 callchain_debug(callchain);
1204 return 0;
1205 }
1206
1207 static int perf_record_config(const char *var, const char *value, void *cb)
1208 {
1209 struct record *rec = cb;
1210
1211 if (!strcmp(var, "record.build-id")) {
1212 if (!strcmp(value, "cache"))
1213 rec->no_buildid_cache = false;
1214 else if (!strcmp(value, "no-cache"))
1215 rec->no_buildid_cache = true;
1216 else if (!strcmp(value, "skip"))
1217 rec->no_buildid = true;
1218 else
1219 return -1;
1220 return 0;
1221 }
1222 if (!strcmp(var, "record.call-graph"))
1223 var = "call-graph.record-mode"; /* fall-through */
1224
1225 return perf_default_config(var, value, cb);
1226 }
1227
1228 struct clockid_map {
1229 const char *name;
1230 int clockid;
1231 };
1232
1233 #define CLOCKID_MAP(n, c) \
1234 { .name = n, .clockid = (c), }
1235
1236 #define CLOCKID_END { .name = NULL, }
1237
1238
1239 /*
1240 * Add the missing ones, we need to build on many distros...
1241 */
1242 #ifndef CLOCK_MONOTONIC_RAW
1243 #define CLOCK_MONOTONIC_RAW 4
1244 #endif
1245 #ifndef CLOCK_BOOTTIME
1246 #define CLOCK_BOOTTIME 7
1247 #endif
1248 #ifndef CLOCK_TAI
1249 #define CLOCK_TAI 11
1250 #endif
1251
1252 static const struct clockid_map clockids[] = {
1253 /* available for all events, NMI safe */
1254 CLOCKID_MAP("monotonic", CLOCK_MONOTONIC),
1255 CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW),
1256
1257 /* available for some events */
1258 CLOCKID_MAP("realtime", CLOCK_REALTIME),
1259 CLOCKID_MAP("boottime", CLOCK_BOOTTIME),
1260 CLOCKID_MAP("tai", CLOCK_TAI),
1261
1262 /* available for the lazy */
1263 CLOCKID_MAP("mono", CLOCK_MONOTONIC),
1264 CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW),
1265 CLOCKID_MAP("real", CLOCK_REALTIME),
1266 CLOCKID_MAP("boot", CLOCK_BOOTTIME),
1267
1268 CLOCKID_END,
1269 };
1270
1271 static int parse_clockid(const struct option *opt, const char *str, int unset)
1272 {
1273 struct record_opts *opts = (struct record_opts *)opt->value;
1274 const struct clockid_map *cm;
1275 const char *ostr = str;
1276
1277 if (unset) {
1278 opts->use_clockid = 0;
1279 return 0;
1280 }
1281
1282 /* no arg passed */
1283 if (!str)
1284 return 0;
1285
1286 /* no setting it twice */
1287 if (opts->use_clockid)
1288 return -1;
1289
1290 opts->use_clockid = true;
1291
1292 /* if its a number, we're done */
1293 if (sscanf(str, "%d", &opts->clockid) == 1)
1294 return 0;
1295
1296 /* allow a "CLOCK_" prefix to the name */
1297 if (!strncasecmp(str, "CLOCK_", 6))
1298 str += 6;
1299
1300 for (cm = clockids; cm->name; cm++) {
1301 if (!strcasecmp(str, cm->name)) {
1302 opts->clockid = cm->clockid;
1303 return 0;
1304 }
1305 }
1306
1307 opts->use_clockid = false;
1308 ui__warning("unknown clockid %s, check man page\n", ostr);
1309 return -1;
1310 }
1311
1312 static int record__parse_mmap_pages(const struct option *opt,
1313 const char *str,
1314 int unset __maybe_unused)
1315 {
1316 struct record_opts *opts = opt->value;
1317 char *s, *p;
1318 unsigned int mmap_pages;
1319 int ret;
1320
1321 if (!str)
1322 return -EINVAL;
1323
1324 s = strdup(str);
1325 if (!s)
1326 return -ENOMEM;
1327
1328 p = strchr(s, ',');
1329 if (p)
1330 *p = '\0';
1331
1332 if (*s) {
1333 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
1334 if (ret)
1335 goto out_free;
1336 opts->mmap_pages = mmap_pages;
1337 }
1338
1339 if (!p) {
1340 ret = 0;
1341 goto out_free;
1342 }
1343
1344 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
1345 if (ret)
1346 goto out_free;
1347
1348 opts->auxtrace_mmap_pages = mmap_pages;
1349
1350 out_free:
1351 free(s);
1352 return ret;
1353 }
1354
1355 static const char * const __record_usage[] = {
1356 "perf record [<options>] [<command>]",
1357 "perf record [<options>] -- <command> [<options>]",
1358 NULL
1359 };
1360 const char * const *record_usage = __record_usage;
1361
1362 /*
1363 * XXX Ideally would be local to cmd_record() and passed to a record__new
1364 * because we need to have access to it in record__exit, that is called
1365 * after cmd_record() exits, but since record_options need to be accessible to
1366 * builtin-script, leave it here.
1367 *
1368 * At least we don't ouch it in all the other functions here directly.
1369 *
1370 * Just say no to tons of global variables, sigh.
1371 */
1372 static struct record record = {
1373 .opts = {
1374 .sample_time = true,
1375 .mmap_pages = UINT_MAX,
1376 .user_freq = UINT_MAX,
1377 .user_interval = ULLONG_MAX,
1378 .freq = 4000,
1379 .target = {
1380 .uses_mmap = true,
1381 .default_per_cpu = true,
1382 },
1383 .proc_map_timeout = 500,
1384 },
1385 .tool = {
1386 .sample = process_sample_event,
1387 .fork = perf_event__process_fork,
1388 .exit = perf_event__process_exit,
1389 .comm = perf_event__process_comm,
1390 .mmap = perf_event__process_mmap,
1391 .mmap2 = perf_event__process_mmap2,
1392 .ordered_events = true,
1393 },
1394 };
1395
1396 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
1397 "\n\t\t\t\tDefault: fp";
1398
1399 static bool dry_run;
1400
1401 /*
1402 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
1403 * with it and switch to use the library functions in perf_evlist that came
1404 * from builtin-record.c, i.e. use record_opts,
1405 * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
1406 * using pipes, etc.
1407 */
1408 static struct option __record_options[] = {
1409 OPT_CALLBACK('e', "event", &record.evlist, "event",
1410 "event selector. use 'perf list' to list available events",
1411 parse_events_option),
1412 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
1413 "event filter", parse_filter),
1414 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
1415 NULL, "don't record events from perf itself",
1416 exclude_perf),
1417 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
1418 "record events on existing process id"),
1419 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
1420 "record events on existing thread id"),
1421 OPT_INTEGER('r', "realtime", &record.realtime_prio,
1422 "collect data with this RT SCHED_FIFO priority"),
1423 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
1424 "collect data without buffering"),
1425 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
1426 "collect raw sample records from all opened counters"),
1427 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
1428 "system-wide collection from all CPUs"),
1429 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
1430 "list of cpus to monitor"),
1431 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
1432 OPT_STRING('o', "output", &record.file.path, "file",
1433 "output file name"),
1434 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
1435 &record.opts.no_inherit_set,
1436 "child tasks do not inherit counters"),
1437 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
1438 "synthesize non-sample events at the end of output"),
1439 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
1440 OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
1441 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
1442 "number of mmap data pages and AUX area tracing mmap pages",
1443 record__parse_mmap_pages),
1444 OPT_BOOLEAN(0, "group", &record.opts.group,
1445 "put the counters into a counter group"),
1446 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
1447 NULL, "enables call-graph recording" ,
1448 &record_callchain_opt),
1449 OPT_CALLBACK(0, "call-graph", &record.opts,
1450 "record_mode[,record_size]", record_callchain_help,
1451 &record_parse_callchain_opt),
1452 OPT_INCR('v', "verbose", &verbose,
1453 "be more verbose (show counter open errors, etc)"),
1454 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
1455 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
1456 "per thread counts"),
1457 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
1458 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
1459 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
1460 &record.opts.sample_time_set,
1461 "Record the sample timestamps"),
1462 OPT_BOOLEAN('P', "period", &record.opts.period, "Record the sample period"),
1463 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
1464 "don't sample"),
1465 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
1466 &record.no_buildid_cache_set,
1467 "do not update the buildid cache"),
1468 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
1469 &record.no_buildid_set,
1470 "do not collect buildids in perf.data"),
1471 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
1472 "monitor event in cgroup name only",
1473 parse_cgroups),
1474 OPT_UINTEGER('D', "delay", &record.opts.initial_delay,
1475 "ms to wait before starting measurement after program start"),
1476 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
1477 "user to profile"),
1478
1479 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
1480 "branch any", "sample any taken branches",
1481 parse_branch_stack),
1482
1483 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
1484 "branch filter mask", "branch stack filter modes",
1485 parse_branch_stack),
1486 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
1487 "sample by weight (on special events only)"),
1488 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
1489 "sample transaction flags (special events only)"),
1490 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
1491 "use per-thread mmaps"),
1492 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
1493 "sample selected machine registers on interrupt,"
1494 " use -I ? to list register names", parse_regs),
1495 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
1496 "Record running/enabled time of read (:S) events"),
1497 OPT_CALLBACK('k', "clockid", &record.opts,
1498 "clockid", "clockid to use for events, see clock_gettime()",
1499 parse_clockid),
1500 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
1501 "opts", "AUX area tracing Snapshot Mode", ""),
1502 OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout,
1503 "per thread proc mmap processing timeout in ms"),
1504 OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
1505 "Record context switch events"),
1506 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
1507 "Configure all used events to run in kernel space.",
1508 PARSE_OPT_EXCLUSIVE),
1509 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
1510 "Configure all used events to run in user space.",
1511 PARSE_OPT_EXCLUSIVE),
1512 OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
1513 "clang binary to use for compiling BPF scriptlets"),
1514 OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
1515 "options passed to clang when compiling BPF scriptlets"),
1516 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
1517 "file", "vmlinux pathname"),
1518 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
1519 "Record build-id of all DSOs regardless of hits"),
1520 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
1521 "append timestamp to output filename"),
1522 OPT_BOOLEAN(0, "switch-output", &record.switch_output,
1523 "Switch output when receive SIGUSR2"),
1524 OPT_BOOLEAN(0, "dry-run", &dry_run,
1525 "Parse options then exit"),
1526 OPT_END()
1527 };
1528
1529 struct option *record_options = __record_options;
1530
1531 int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
1532 {
1533 int err;
1534 struct record *rec = &record;
1535 char errbuf[BUFSIZ];
1536
1537 #ifndef HAVE_LIBBPF_SUPPORT
1538 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
1539 set_nobuild('\0', "clang-path", true);
1540 set_nobuild('\0', "clang-opt", true);
1541 # undef set_nobuild
1542 #endif
1543
1544 #ifndef HAVE_BPF_PROLOGUE
1545 # if !defined (HAVE_DWARF_SUPPORT)
1546 # define REASON "NO_DWARF=1"
1547 # elif !defined (HAVE_LIBBPF_SUPPORT)
1548 # define REASON "NO_LIBBPF=1"
1549 # else
1550 # define REASON "this architecture doesn't support BPF prologue"
1551 # endif
1552 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
1553 set_nobuild('\0', "vmlinux", true);
1554 # undef set_nobuild
1555 # undef REASON
1556 #endif
1557
1558 rec->evlist = perf_evlist__new();
1559 if (rec->evlist == NULL)
1560 return -ENOMEM;
1561
1562 perf_config(perf_record_config, rec);
1563
1564 argc = parse_options(argc, argv, record_options, record_usage,
1565 PARSE_OPT_STOP_AT_NON_OPTION);
1566 if (!argc && target__none(&rec->opts.target))
1567 usage_with_options(record_usage, record_options);
1568
1569 if (nr_cgroups && !rec->opts.target.system_wide) {
1570 usage_with_options_msg(record_usage, record_options,
1571 "cgroup monitoring only available in system-wide mode");
1572
1573 }
1574 if (rec->opts.record_switch_events &&
1575 !perf_can_record_switch_events()) {
1576 ui__error("kernel does not support recording context switch events\n");
1577 parse_options_usage(record_usage, record_options, "switch-events", 0);
1578 return -EINVAL;
1579 }
1580
1581 if (rec->switch_output)
1582 rec->timestamp_filename = true;
1583
1584 if (!rec->itr) {
1585 rec->itr = auxtrace_record__init(rec->evlist, &err);
1586 if (err)
1587 goto out;
1588 }
1589
1590 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
1591 rec->opts.auxtrace_snapshot_opts);
1592 if (err)
1593 goto out;
1594
1595 /*
1596 * Allow aliases to facilitate the lookup of symbols for address
1597 * filters. Refer to auxtrace_parse_filters().
1598 */
1599 symbol_conf.allow_aliases = true;
1600
1601 symbol__init(NULL);
1602
1603 err = auxtrace_parse_filters(rec->evlist);
1604 if (err)
1605 goto out;
1606
1607 if (dry_run)
1608 goto out;
1609
1610 err = bpf__setup_stdout(rec->evlist);
1611 if (err) {
1612 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
1613 pr_err("ERROR: Setup BPF stdout failed: %s\n",
1614 errbuf);
1615 goto out;
1616 }
1617
1618 err = -ENOMEM;
1619
1620 if (symbol_conf.kptr_restrict)
1621 pr_warning(
1622 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
1623 "check /proc/sys/kernel/kptr_restrict.\n\n"
1624 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
1625 "file is not found in the buildid cache or in the vmlinux path.\n\n"
1626 "Samples in kernel modules won't be resolved at all.\n\n"
1627 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1628 "even with a suitable vmlinux or kallsyms file.\n\n");
1629
1630 if (rec->no_buildid_cache || rec->no_buildid) {
1631 disable_buildid_cache();
1632 } else if (rec->switch_output) {
1633 /*
1634 * In 'perf record --switch-output', disable buildid
1635 * generation by default to reduce data file switching
1636 * overhead. Still generate buildid if they are required
1637 * explicitly using
1638 *
1639 * perf record --switch-output --no-no-buildid \
1640 * --no-no-buildid-cache
1641 *
1642 * Following code equals to:
1643 *
1644 * if ((rec->no_buildid || !rec->no_buildid_set) &&
1645 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
1646 * disable_buildid_cache();
1647 */
1648 bool disable = true;
1649
1650 if (rec->no_buildid_set && !rec->no_buildid)
1651 disable = false;
1652 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
1653 disable = false;
1654 if (disable) {
1655 rec->no_buildid = true;
1656 rec->no_buildid_cache = true;
1657 disable_buildid_cache();
1658 }
1659 }
1660
1661 if (record.opts.overwrite)
1662 record.opts.tail_synthesize = true;
1663
1664 if (rec->evlist->nr_entries == 0 &&
1665 perf_evlist__add_default(rec->evlist) < 0) {
1666 pr_err("Not enough memory for event selector list\n");
1667 goto out;
1668 }
1669
1670 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
1671 rec->opts.no_inherit = true;
1672
1673 err = target__validate(&rec->opts.target);
1674 if (err) {
1675 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1676 ui__warning("%s", errbuf);
1677 }
1678
1679 err = target__parse_uid(&rec->opts.target);
1680 if (err) {
1681 int saved_errno = errno;
1682
1683 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1684 ui__error("%s", errbuf);
1685
1686 err = -saved_errno;
1687 goto out;
1688 }
1689
1690 /* Enable ignoring missing threads when -u option is defined. */
1691 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX;
1692
1693 err = -ENOMEM;
1694 if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
1695 usage_with_options(record_usage, record_options);
1696
1697 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
1698 if (err)
1699 goto out;
1700
1701 /*
1702 * We take all buildids when the file contains
1703 * AUX area tracing data because we do not decode the
1704 * trace because it would take too long.
1705 */
1706 if (rec->opts.full_auxtrace)
1707 rec->buildid_all = true;
1708
1709 if (record_opts__config(&rec->opts)) {
1710 err = -EINVAL;
1711 goto out;
1712 }
1713
1714 err = __cmd_record(&record, argc, argv);
1715 out:
1716 perf_evlist__delete(rec->evlist);
1717 symbol__exit();
1718 auxtrace_record__free(rec->itr);
1719 return err;
1720 }
1721
1722 static void snapshot_sig_handler(int sig __maybe_unused)
1723 {
1724 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
1725 trigger_hit(&auxtrace_snapshot_trigger);
1726 auxtrace_record__snapshot_started = 1;
1727 if (auxtrace_record__snapshot_start(record.itr))
1728 trigger_error(&auxtrace_snapshot_trigger);
1729 }
1730
1731 if (trigger_is_ready(&switch_output_trigger))
1732 trigger_hit(&switch_output_trigger);
1733 }
Linux with added FPC-III support