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8
9#include "builtin.h"
10
11#include "util/build-id.h"
12#include <subcmd/parse-options.h>
13#include "util/parse-events.h"
14#include "util/config.h"
15
16#include "util/callchain.h"
17#include "util/cgroup.h"
18#include "util/header.h"
19#include "util/event.h"
20#include "util/evlist.h"
21#include "util/evsel.h"
22#include "util/debug.h"
23#include "util/mmap.h"
24#include "util/target.h"
25#include "util/session.h"
26#include "util/tool.h"
27#include "util/symbol.h"
28#include "util/record.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/perf_api_probe.h"
38#include "util/llvm-utils.h"
39#include "util/bpf-loader.h"
40#include "util/trigger.h"
41#include "util/perf-hooks.h"
42#include "util/cpu-set-sched.h"
43#include "util/synthetic-events.h"
44#include "util/time-utils.h"
45#include "util/units.h"
46#include "util/bpf-event.h"
47#include "util/util.h"
48#include "util/pfm.h"
49#include "util/clockid.h"
50#include "asm/bug.h"
51#include "perf.h"
52
53#include <errno.h>
54#include <inttypes.h>
55#include <locale.h>
56#include <poll.h>
57#include <pthread.h>
58#include <unistd.h>
59#include <sched.h>
60#include <signal.h>
61#ifdef HAVE_EVENTFD_SUPPORT
62#include <sys/eventfd.h>
63#endif
64#include <sys/mman.h>
65#include <sys/wait.h>
66#include <sys/types.h>
67#include <sys/stat.h>
68#include <fcntl.h>
69#include <linux/err.h>
70#include <linux/string.h>
71#include <linux/time64.h>
72#include <linux/zalloc.h>
73#include <linux/bitmap.h>
74#include <sys/time.h>
75
76struct switch_output {
77 bool enabled;
78 bool signal;
79 unsigned long size;
80 unsigned long time;
81 const char *str;
82 bool set;
83 char **filenames;
84 int num_files;
85 int cur_file;
86};
87
88struct record {
89 struct perf_tool tool;
90 struct record_opts opts;
91 u64 bytes_written;
92 struct perf_data data;
93 struct auxtrace_record *itr;
94 struct evlist *evlist;
95 struct perf_session *session;
96 struct evlist *sb_evlist;
97 pthread_t thread_id;
98 int realtime_prio;
99 bool switch_output_event_set;
100 bool no_buildid;
101 bool no_buildid_set;
102 bool no_buildid_cache;
103 bool no_buildid_cache_set;
104 bool buildid_all;
105 bool timestamp_filename;
106 bool timestamp_boundary;
107 struct switch_output switch_output;
108 unsigned long long samples;
109 struct mmap_cpu_mask affinity_mask;
110 unsigned long output_max_size;
111};
112
113static volatile int done;
114
115static volatile int auxtrace_record__snapshot_started;
116static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
117static DEFINE_TRIGGER(switch_output_trigger);
118
119static const char *affinity_tags[PERF_AFFINITY_MAX] = {
120 "SYS", "NODE", "CPU"
121};
122
123static bool switch_output_signal(struct record *rec)
124{
125 return rec->switch_output.signal &&
126 trigger_is_ready(&switch_output_trigger);
127}
128
129static bool switch_output_size(struct record *rec)
130{
131 return rec->switch_output.size &&
132 trigger_is_ready(&switch_output_trigger) &&
133 (rec->bytes_written >= rec->switch_output.size);
134}
135
136static bool switch_output_time(struct record *rec)
137{
138 return rec->switch_output.time &&
139 trigger_is_ready(&switch_output_trigger);
140}
141
142static bool record__output_max_size_exceeded(struct record *rec)
143{
144 return rec->output_max_size &&
145 (rec->bytes_written >= rec->output_max_size);
146}
147
148static int record__write(struct record *rec, struct mmap *map __maybe_unused,
149 void *bf, size_t size)
150{
151 struct perf_data_file *file = &rec->session->data->file;
152
153 if (perf_data_file__write(file, bf, size) < 0) {
154 pr_err("failed to write perf data, error: %m\n");
155 return -1;
156 }
157
158 rec->bytes_written += size;
159
160 if (record__output_max_size_exceeded(rec) && !done) {
161 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
162 " stopping session ]\n",
163 rec->bytes_written >> 10);
164 done = 1;
165 }
166
167 if (switch_output_size(rec))
168 trigger_hit(&switch_output_trigger);
169
170 return 0;
171}
172
173static int record__aio_enabled(struct record *rec);
174static int record__comp_enabled(struct record *rec);
175static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
176 void *src, size_t src_size);
177
178#ifdef HAVE_AIO_SUPPORT
179static int record__aio_write(struct aiocb *cblock, int trace_fd,
180 void *buf, size_t size, off_t off)
181{
182 int rc;
183
184 cblock->aio_fildes = trace_fd;
185 cblock->aio_buf = buf;
186 cblock->aio_nbytes = size;
187 cblock->aio_offset = off;
188 cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
189
190 do {
191 rc = aio_write(cblock);
192 if (rc == 0) {
193 break;
194 } else if (errno != EAGAIN) {
195 cblock->aio_fildes = -1;
196 pr_err("failed to queue perf data, error: %m\n");
197 break;
198 }
199 } while (1);
200
201 return rc;
202}
203
204static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
205{
206 void *rem_buf;
207 off_t rem_off;
208 size_t rem_size;
209 int rc, aio_errno;
210 ssize_t aio_ret, written;
211
212 aio_errno = aio_error(cblock);
213 if (aio_errno == EINPROGRESS)
214 return 0;
215
216 written = aio_ret = aio_return(cblock);
217 if (aio_ret < 0) {
218 if (aio_errno != EINTR)
219 pr_err("failed to write perf data, error: %m\n");
220 written = 0;
221 }
222
223 rem_size = cblock->aio_nbytes - written;
224
225 if (rem_size == 0) {
226 cblock->aio_fildes = -1;
227
228
229
230
231
232 perf_mmap__put(&md->core);
233 rc = 1;
234 } else {
235
236
237
238
239
240 rem_off = cblock->aio_offset + written;
241 rem_buf = (void *)(cblock->aio_buf + written);
242 record__aio_write(cblock, cblock->aio_fildes,
243 rem_buf, rem_size, rem_off);
244 rc = 0;
245 }
246
247 return rc;
248}
249
250static int record__aio_sync(struct mmap *md, bool sync_all)
251{
252 struct aiocb **aiocb = md->aio.aiocb;
253 struct aiocb *cblocks = md->aio.cblocks;
254 struct timespec timeout = { 0, 1000 * 1000 * 1 };
255 int i, do_suspend;
256
257 do {
258 do_suspend = 0;
259 for (i = 0; i < md->aio.nr_cblocks; ++i) {
260 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
261 if (sync_all)
262 aiocb[i] = NULL;
263 else
264 return i;
265 } else {
266
267
268
269
270
271 aiocb[i] = &cblocks[i];
272 do_suspend = 1;
273 }
274 }
275 if (!do_suspend)
276 return -1;
277
278 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
279 if (!(errno == EAGAIN || errno == EINTR))
280 pr_err("failed to sync perf data, error: %m\n");
281 }
282 } while (1);
283}
284
285struct record_aio {
286 struct record *rec;
287 void *data;
288 size_t size;
289};
290
291static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
292{
293 struct record_aio *aio = to;
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309 if (record__comp_enabled(aio->rec)) {
310 size = zstd_compress(aio->rec->session, aio->data + aio->size,
311 mmap__mmap_len(map) - aio->size,
312 buf, size);
313 } else {
314 memcpy(aio->data + aio->size, buf, size);
315 }
316
317 if (!aio->size) {
318
319
320
321
322
323
324
325
326
327
328 perf_mmap__get(&map->core);
329 }
330
331 aio->size += size;
332
333 return size;
334}
335
336static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
337{
338 int ret, idx;
339 int trace_fd = rec->session->data->file.fd;
340 struct record_aio aio = { .rec = rec, .size = 0 };
341
342
343
344
345
346
347 idx = record__aio_sync(map, false);
348 aio.data = map->aio.data[idx];
349 ret = perf_mmap__push(map, &aio, record__aio_pushfn);
350 if (ret != 0)
351 return ret;
352
353 rec->samples++;
354 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
355 if (!ret) {
356 *off += aio.size;
357 rec->bytes_written += aio.size;
358 if (switch_output_size(rec))
359 trigger_hit(&switch_output_trigger);
360 } else {
361
362
363
364
365
366
367 perf_mmap__put(&map->core);
368 }
369
370 return ret;
371}
372
373static off_t record__aio_get_pos(int trace_fd)
374{
375 return lseek(trace_fd, 0, SEEK_CUR);
376}
377
378static void record__aio_set_pos(int trace_fd, off_t pos)
379{
380 lseek(trace_fd, pos, SEEK_SET);
381}
382
383static void record__aio_mmap_read_sync(struct record *rec)
384{
385 int i;
386 struct evlist *evlist = rec->evlist;
387 struct mmap *maps = evlist->mmap;
388
389 if (!record__aio_enabled(rec))
390 return;
391
392 for (i = 0; i < evlist->core.nr_mmaps; i++) {
393 struct mmap *map = &maps[i];
394
395 if (map->core.base)
396 record__aio_sync(map, true);
397 }
398}
399
400static int nr_cblocks_default = 1;
401static int nr_cblocks_max = 4;
402
403static int record__aio_parse(const struct option *opt,
404 const char *str,
405 int unset)
406{
407 struct record_opts *opts = (struct record_opts *)opt->value;
408
409 if (unset) {
410 opts->nr_cblocks = 0;
411 } else {
412 if (str)
413 opts->nr_cblocks = strtol(str, NULL, 0);
414 if (!opts->nr_cblocks)
415 opts->nr_cblocks = nr_cblocks_default;
416 }
417
418 return 0;
419}
420#else
421static int nr_cblocks_max = 0;
422
423static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
424 off_t *off __maybe_unused)
425{
426 return -1;
427}
428
429static off_t record__aio_get_pos(int trace_fd __maybe_unused)
430{
431 return -1;
432}
433
434static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
435{
436}
437
438static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
439{
440}
441#endif
442
443static int record__aio_enabled(struct record *rec)
444{
445 return rec->opts.nr_cblocks > 0;
446}
447
448#define MMAP_FLUSH_DEFAULT 1
449static int record__mmap_flush_parse(const struct option *opt,
450 const char *str,
451 int unset)
452{
453 int flush_max;
454 struct record_opts *opts = (struct record_opts *)opt->value;
455 static struct parse_tag tags[] = {
456 { .tag = 'B', .mult = 1 },
457 { .tag = 'K', .mult = 1 << 10 },
458 { .tag = 'M', .mult = 1 << 20 },
459 { .tag = 'G', .mult = 1 << 30 },
460 { .tag = 0 },
461 };
462
463 if (unset)
464 return 0;
465
466 if (str) {
467 opts->mmap_flush = parse_tag_value(str, tags);
468 if (opts->mmap_flush == (int)-1)
469 opts->mmap_flush = strtol(str, NULL, 0);
470 }
471
472 if (!opts->mmap_flush)
473 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
474
475 flush_max = evlist__mmap_size(opts->mmap_pages);
476 flush_max /= 4;
477 if (opts->mmap_flush > flush_max)
478 opts->mmap_flush = flush_max;
479
480 return 0;
481}
482
483#ifdef HAVE_ZSTD_SUPPORT
484static unsigned int comp_level_default = 1;
485
486static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
487{
488 struct record_opts *opts = opt->value;
489
490 if (unset) {
491 opts->comp_level = 0;
492 } else {
493 if (str)
494 opts->comp_level = strtol(str, NULL, 0);
495 if (!opts->comp_level)
496 opts->comp_level = comp_level_default;
497 }
498
499 return 0;
500}
501#endif
502static unsigned int comp_level_max = 22;
503
504static int record__comp_enabled(struct record *rec)
505{
506 return rec->opts.comp_level > 0;
507}
508
509static int process_synthesized_event(struct perf_tool *tool,
510 union perf_event *event,
511 struct perf_sample *sample __maybe_unused,
512 struct machine *machine __maybe_unused)
513{
514 struct record *rec = container_of(tool, struct record, tool);
515 return record__write(rec, NULL, event, event->header.size);
516}
517
518static int process_locked_synthesized_event(struct perf_tool *tool,
519 union perf_event *event,
520 struct perf_sample *sample __maybe_unused,
521 struct machine *machine __maybe_unused)
522{
523 static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
524 int ret;
525
526 pthread_mutex_lock(&synth_lock);
527 ret = process_synthesized_event(tool, event, sample, machine);
528 pthread_mutex_unlock(&synth_lock);
529 return ret;
530}
531
532static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
533{
534 struct record *rec = to;
535
536 if (record__comp_enabled(rec)) {
537 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
538 bf = map->data;
539 }
540
541 rec->samples++;
542 return record__write(rec, map, bf, size);
543}
544
545static volatile int signr = -1;
546static volatile int child_finished;
547#ifdef HAVE_EVENTFD_SUPPORT
548static int done_fd = -1;
549#endif
550
551static void sig_handler(int sig)
552{
553 if (sig == SIGCHLD)
554 child_finished = 1;
555 else
556 signr = sig;
557
558 done = 1;
559#ifdef HAVE_EVENTFD_SUPPORT
560{
561 u64 tmp = 1;
562
563
564
565
566
567
568
569
570 if (write(done_fd, &tmp, sizeof(tmp)) < 0)
571 pr_err("failed to signal wakeup fd, error: %m\n");
572}
573#endif
574}
575
576static void sigsegv_handler(int sig)
577{
578 perf_hooks__recover();
579 sighandler_dump_stack(sig);
580}
581
582static void record__sig_exit(void)
583{
584 if (signr == -1)
585 return;
586
587 signal(signr, SIG_DFL);
588 raise(signr);
589}
590
591#ifdef HAVE_AUXTRACE_SUPPORT
592
593static int record__process_auxtrace(struct perf_tool *tool,
594 struct mmap *map,
595 union perf_event *event, void *data1,
596 size_t len1, void *data2, size_t len2)
597{
598 struct record *rec = container_of(tool, struct record, tool);
599 struct perf_data *data = &rec->data;
600 size_t padding;
601 u8 pad[8] = {0};
602
603 if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
604 off_t file_offset;
605 int fd = perf_data__fd(data);
606 int err;
607
608 file_offset = lseek(fd, 0, SEEK_CUR);
609 if (file_offset == -1)
610 return -1;
611 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
612 event, file_offset);
613 if (err)
614 return err;
615 }
616
617
618 padding = (len1 + len2) & 7;
619 if (padding)
620 padding = 8 - padding;
621
622 record__write(rec, map, event, event->header.size);
623 record__write(rec, map, data1, len1);
624 if (len2)
625 record__write(rec, map, data2, len2);
626 record__write(rec, map, &pad, padding);
627
628 return 0;
629}
630
631static int record__auxtrace_mmap_read(struct record *rec,
632 struct mmap *map)
633{
634 int ret;
635
636 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
637 record__process_auxtrace);
638 if (ret < 0)
639 return ret;
640
641 if (ret)
642 rec->samples++;
643
644 return 0;
645}
646
647static int record__auxtrace_mmap_read_snapshot(struct record *rec,
648 struct mmap *map)
649{
650 int ret;
651
652 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
653 record__process_auxtrace,
654 rec->opts.auxtrace_snapshot_size);
655 if (ret < 0)
656 return ret;
657
658 if (ret)
659 rec->samples++;
660
661 return 0;
662}
663
664static int record__auxtrace_read_snapshot_all(struct record *rec)
665{
666 int i;
667 int rc = 0;
668
669 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
670 struct mmap *map = &rec->evlist->mmap[i];
671
672 if (!map->auxtrace_mmap.base)
673 continue;
674
675 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
676 rc = -1;
677 goto out;
678 }
679 }
680out:
681 return rc;
682}
683
684static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
685{
686 pr_debug("Recording AUX area tracing snapshot\n");
687 if (record__auxtrace_read_snapshot_all(rec) < 0) {
688 trigger_error(&auxtrace_snapshot_trigger);
689 } else {
690 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
691 trigger_error(&auxtrace_snapshot_trigger);
692 else
693 trigger_ready(&auxtrace_snapshot_trigger);
694 }
695}
696
697static int record__auxtrace_snapshot_exit(struct record *rec)
698{
699 if (trigger_is_error(&auxtrace_snapshot_trigger))
700 return 0;
701
702 if (!auxtrace_record__snapshot_started &&
703 auxtrace_record__snapshot_start(rec->itr))
704 return -1;
705
706 record__read_auxtrace_snapshot(rec, true);
707 if (trigger_is_error(&auxtrace_snapshot_trigger))
708 return -1;
709
710 return 0;
711}
712
713static int record__auxtrace_init(struct record *rec)
714{
715 int err;
716
717 if (!rec->itr) {
718 rec->itr = auxtrace_record__init(rec->evlist, &err);
719 if (err)
720 return err;
721 }
722
723 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
724 rec->opts.auxtrace_snapshot_opts);
725 if (err)
726 return err;
727
728 err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
729 rec->opts.auxtrace_sample_opts);
730 if (err)
731 return err;
732
733 return auxtrace_parse_filters(rec->evlist);
734}
735
736#else
737
738static inline
739int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
740 struct mmap *map __maybe_unused)
741{
742 return 0;
743}
744
745static inline
746void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
747 bool on_exit __maybe_unused)
748{
749}
750
751static inline
752int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
753{
754 return 0;
755}
756
757static inline
758int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
759{
760 return 0;
761}
762
763static int record__auxtrace_init(struct record *rec __maybe_unused)
764{
765 return 0;
766}
767
768#endif
769
770static int record__config_text_poke(struct evlist *evlist)
771{
772 struct evsel *evsel;
773 int err;
774
775
776 evlist__for_each_entry(evlist, evsel) {
777 if (evsel->core.attr.text_poke)
778 return 0;
779 }
780
781 err = parse_events(evlist, "dummy:u", NULL);
782 if (err)
783 return err;
784
785 evsel = evlist__last(evlist);
786
787 evsel->core.attr.freq = 0;
788 evsel->core.attr.sample_period = 1;
789 evsel->core.attr.text_poke = 1;
790 evsel->core.attr.ksymbol = 1;
791
792 evsel->core.system_wide = true;
793 evsel->no_aux_samples = true;
794 evsel->immediate = true;
795
796
797 perf_cpu_map__put(evsel->core.own_cpus);
798 evsel->core.own_cpus = perf_cpu_map__new(NULL);
799 perf_cpu_map__put(evsel->core.cpus);
800 evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
801
802 evsel__set_sample_bit(evsel, TIME);
803
804 return 0;
805}
806
807static bool record__kcore_readable(struct machine *machine)
808{
809 char kcore[PATH_MAX];
810 int fd;
811
812 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
813
814 fd = open(kcore, O_RDONLY);
815 if (fd < 0)
816 return false;
817
818 close(fd);
819
820 return true;
821}
822
823static int record__kcore_copy(struct machine *machine, struct perf_data *data)
824{
825 char from_dir[PATH_MAX];
826 char kcore_dir[PATH_MAX];
827 int ret;
828
829 snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
830
831 ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
832 if (ret)
833 return ret;
834
835 return kcore_copy(from_dir, kcore_dir);
836}
837
838static int record__mmap_evlist(struct record *rec,
839 struct evlist *evlist)
840{
841 struct record_opts *opts = &rec->opts;
842 bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
843 opts->auxtrace_sample_mode;
844 char msg[512];
845
846 if (opts->affinity != PERF_AFFINITY_SYS)
847 cpu__setup_cpunode_map();
848
849 if (evlist__mmap_ex(evlist, opts->mmap_pages,
850 opts->auxtrace_mmap_pages,
851 auxtrace_overwrite,
852 opts->nr_cblocks, opts->affinity,
853 opts->mmap_flush, opts->comp_level) < 0) {
854 if (errno == EPERM) {
855 pr_err("Permission error mapping pages.\n"
856 "Consider increasing "
857 "/proc/sys/kernel/perf_event_mlock_kb,\n"
858 "or try again with a smaller value of -m/--mmap_pages.\n"
859 "(current value: %u,%u)\n",
860 opts->mmap_pages, opts->auxtrace_mmap_pages);
861 return -errno;
862 } else {
863 pr_err("failed to mmap with %d (%s)\n", errno,
864 str_error_r(errno, msg, sizeof(msg)));
865 if (errno)
866 return -errno;
867 else
868 return -EINVAL;
869 }
870 }
871 return 0;
872}
873
874static int record__mmap(struct record *rec)
875{
876 return record__mmap_evlist(rec, rec->evlist);
877}
878
879static int record__open(struct record *rec)
880{
881 char msg[BUFSIZ];
882 struct evsel *pos;
883 struct evlist *evlist = rec->evlist;
884 struct perf_session *session = rec->session;
885 struct record_opts *opts = &rec->opts;
886 int rc = 0;
887
888
889
890
891
892
893 if (opts->initial_delay || target__has_cpu(&opts->target)) {
894 pos = perf_evlist__get_tracking_event(evlist);
895 if (!evsel__is_dummy_event(pos)) {
896
897 if (evlist__add_dummy(evlist))
898 return -ENOMEM;
899 pos = evlist__last(evlist);
900 perf_evlist__set_tracking_event(evlist, pos);
901 }
902
903
904
905
906
907 if (opts->initial_delay && !pos->immediate)
908 pos->core.attr.enable_on_exec = 1;
909 else
910 pos->immediate = 1;
911 }
912
913 perf_evlist__config(evlist, opts, &callchain_param);
914
915 evlist__for_each_entry(evlist, pos) {
916try_again:
917 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
918 if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
919 if (verbose > 0)
920 ui__warning("%s\n", msg);
921 goto try_again;
922 }
923 if ((errno == EINVAL || errno == EBADF) &&
924 pos->leader != pos &&
925 pos->weak_group) {
926 pos = perf_evlist__reset_weak_group(evlist, pos, true);
927 goto try_again;
928 }
929 rc = -errno;
930 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
931 ui__error("%s\n", msg);
932 goto out;
933 }
934
935 pos->supported = true;
936 }
937
938 if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(evlist)) {
939 pr_warning(
940"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
941"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
942"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
943"file is not found in the buildid cache or in the vmlinux path.\n\n"
944"Samples in kernel modules won't be resolved at all.\n\n"
945"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
946"even with a suitable vmlinux or kallsyms file.\n\n");
947 }
948
949 if (perf_evlist__apply_filters(evlist, &pos)) {
950 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
951 pos->filter, evsel__name(pos), errno,
952 str_error_r(errno, msg, sizeof(msg)));
953 rc = -1;
954 goto out;
955 }
956
957 rc = record__mmap(rec);
958 if (rc)
959 goto out;
960
961 session->evlist = evlist;
962 perf_session__set_id_hdr_size(session);
963out:
964 return rc;
965}
966
967static int process_sample_event(struct perf_tool *tool,
968 union perf_event *event,
969 struct perf_sample *sample,
970 struct evsel *evsel,
971 struct machine *machine)
972{
973 struct record *rec = container_of(tool, struct record, tool);
974
975 if (rec->evlist->first_sample_time == 0)
976 rec->evlist->first_sample_time = sample->time;
977
978 rec->evlist->last_sample_time = sample->time;
979
980 if (rec->buildid_all)
981 return 0;
982
983 rec->samples++;
984 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
985}
986
987static int process_buildids(struct record *rec)
988{
989 struct perf_session *session = rec->session;
990
991 if (perf_data__size(&rec->data) == 0)
992 return 0;
993
994
995
996
997
998
999
1000
1001
1002
1003 symbol_conf.ignore_vmlinux_buildid = true;
1004
1005
1006
1007
1008
1009
1010
1011 if (rec->buildid_all && !rec->timestamp_boundary)
1012 rec->tool.sample = NULL;
1013
1014 return perf_session__process_events(session);
1015}
1016
1017static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1018{
1019 int err;
1020 struct perf_tool *tool = data;
1021
1022
1023
1024
1025
1026
1027
1028
1029 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1030 machine);
1031 if (err < 0)
1032 pr_err("Couldn't record guest kernel [%d]'s reference"
1033 " relocation symbol.\n", machine->pid);
1034
1035
1036
1037
1038
1039 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1040 machine);
1041 if (err < 0)
1042 pr_err("Couldn't record guest kernel [%d]'s reference"
1043 " relocation symbol.\n", machine->pid);
1044}
1045
1046static struct perf_event_header finished_round_event = {
1047 .size = sizeof(struct perf_event_header),
1048 .type = PERF_RECORD_FINISHED_ROUND,
1049};
1050
1051static void record__adjust_affinity(struct record *rec, struct mmap *map)
1052{
1053 if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1054 !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits,
1055 rec->affinity_mask.nbits)) {
1056 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits);
1057 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits,
1058 map->affinity_mask.bits, rec->affinity_mask.nbits);
1059 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask),
1060 (cpu_set_t *)rec->affinity_mask.bits);
1061 if (verbose == 2)
1062 mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread");
1063 }
1064}
1065
1066static size_t process_comp_header(void *record, size_t increment)
1067{
1068 struct perf_record_compressed *event = record;
1069 size_t size = sizeof(*event);
1070
1071 if (increment) {
1072 event->header.size += increment;
1073 return increment;
1074 }
1075
1076 event->header.type = PERF_RECORD_COMPRESSED;
1077 event->header.size = size;
1078
1079 return size;
1080}
1081
1082static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
1083 void *src, size_t src_size)
1084{
1085 size_t compressed;
1086 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1087
1088 compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
1089 max_record_size, process_comp_header);
1090
1091 session->bytes_transferred += src_size;
1092 session->bytes_compressed += compressed;
1093
1094 return compressed;
1095}
1096
1097static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1098 bool overwrite, bool synch)
1099{
1100 u64 bytes_written = rec->bytes_written;
1101 int i;
1102 int rc = 0;
1103 struct mmap *maps;
1104 int trace_fd = rec->data.file.fd;
1105 off_t off = 0;
1106
1107 if (!evlist)
1108 return 0;
1109
1110 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
1111 if (!maps)
1112 return 0;
1113
1114 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1115 return 0;
1116
1117 if (record__aio_enabled(rec))
1118 off = record__aio_get_pos(trace_fd);
1119
1120 for (i = 0; i < evlist->core.nr_mmaps; i++) {
1121 u64 flush = 0;
1122 struct mmap *map = &maps[i];
1123
1124 if (map->core.base) {
1125 record__adjust_affinity(rec, map);
1126 if (synch) {
1127 flush = map->core.flush;
1128 map->core.flush = 1;
1129 }
1130 if (!record__aio_enabled(rec)) {
1131 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1132 if (synch)
1133 map->core.flush = flush;
1134 rc = -1;
1135 goto out;
1136 }
1137 } else {
1138 if (record__aio_push(rec, map, &off) < 0) {
1139 record__aio_set_pos(trace_fd, off);
1140 if (synch)
1141 map->core.flush = flush;
1142 rc = -1;
1143 goto out;
1144 }
1145 }
1146 if (synch)
1147 map->core.flush = flush;
1148 }
1149
1150 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1151 !rec->opts.auxtrace_sample_mode &&
1152 record__auxtrace_mmap_read(rec, map) != 0) {
1153 rc = -1;
1154 goto out;
1155 }
1156 }
1157
1158 if (record__aio_enabled(rec))
1159 record__aio_set_pos(trace_fd, off);
1160
1161
1162
1163
1164
1165 if (bytes_written != rec->bytes_written)
1166 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1167
1168 if (overwrite)
1169 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1170out:
1171 return rc;
1172}
1173
1174static int record__mmap_read_all(struct record *rec, bool synch)
1175{
1176 int err;
1177
1178 err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1179 if (err)
1180 return err;
1181
1182 return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1183}
1184
1185static void record__init_features(struct record *rec)
1186{
1187 struct perf_session *session = rec->session;
1188 int feat;
1189
1190 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1191 perf_header__set_feat(&session->header, feat);
1192
1193 if (rec->no_buildid)
1194 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1195
1196 if (!have_tracepoints(&rec->evlist->core.entries))
1197 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1198
1199 if (!rec->opts.branch_stack)
1200 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1201
1202 if (!rec->opts.full_auxtrace)
1203 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1204
1205 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1206 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1207
1208 if (!rec->opts.use_clockid)
1209 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1210
1211 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1212 if (!record__comp_enabled(rec))
1213 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1214
1215 perf_header__clear_feat(&session->header, HEADER_STAT);
1216}
1217
1218static void
1219record__finish_output(struct record *rec)
1220{
1221 struct perf_data *data = &rec->data;
1222 int fd = perf_data__fd(data);
1223
1224 if (data->is_pipe)
1225 return;
1226
1227 rec->session->header.data_size += rec->bytes_written;
1228 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1229
1230 if (!rec->no_buildid) {
1231 process_buildids(rec);
1232
1233 if (rec->buildid_all)
1234 dsos__hit_all(rec->session);
1235 }
1236 perf_session__write_header(rec->session, rec->evlist, fd, true);
1237
1238 return;
1239}
1240
1241static int record__synthesize_workload(struct record *rec, bool tail)
1242{
1243 int err;
1244 struct perf_thread_map *thread_map;
1245
1246 if (rec->opts.tail_synthesize != tail)
1247 return 0;
1248
1249 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1250 if (thread_map == NULL)
1251 return -1;
1252
1253 err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1254 process_synthesized_event,
1255 &rec->session->machines.host,
1256 rec->opts.sample_address);
1257 perf_thread_map__put(thread_map);
1258 return err;
1259}
1260
1261static int record__synthesize(struct record *rec, bool tail);
1262
1263static int
1264record__switch_output(struct record *rec, bool at_exit)
1265{
1266 struct perf_data *data = &rec->data;
1267 int fd, err;
1268 char *new_filename;
1269
1270
1271 char timestamp[] = "InvalidTimestamp";
1272
1273 record__aio_mmap_read_sync(rec);
1274
1275 record__synthesize(rec, true);
1276 if (target__none(&rec->opts.target))
1277 record__synthesize_workload(rec, true);
1278
1279 rec->samples = 0;
1280 record__finish_output(rec);
1281 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1282 if (err) {
1283 pr_err("Failed to get current timestamp\n");
1284 return -EINVAL;
1285 }
1286
1287 fd = perf_data__switch(data, timestamp,
1288 rec->session->header.data_offset,
1289 at_exit, &new_filename);
1290 if (fd >= 0 && !at_exit) {
1291 rec->bytes_written = 0;
1292 rec->session->header.data_size = 0;
1293 }
1294
1295 if (!quiet)
1296 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1297 data->path, timestamp);
1298
1299 if (rec->switch_output.num_files) {
1300 int n = rec->switch_output.cur_file + 1;
1301
1302 if (n >= rec->switch_output.num_files)
1303 n = 0;
1304 rec->switch_output.cur_file = n;
1305 if (rec->switch_output.filenames[n]) {
1306 remove(rec->switch_output.filenames[n]);
1307 zfree(&rec->switch_output.filenames[n]);
1308 }
1309 rec->switch_output.filenames[n] = new_filename;
1310 } else {
1311 free(new_filename);
1312 }
1313
1314
1315 if (!at_exit) {
1316 record__synthesize(rec, false);
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327 if (target__none(&rec->opts.target))
1328 record__synthesize_workload(rec, false);
1329 }
1330 return fd;
1331}
1332
1333static volatile int workload_exec_errno;
1334
1335
1336
1337
1338
1339
1340static void workload_exec_failed_signal(int signo __maybe_unused,
1341 siginfo_t *info,
1342 void *ucontext __maybe_unused)
1343{
1344 workload_exec_errno = info->si_value.sival_int;
1345 done = 1;
1346 child_finished = 1;
1347}
1348
1349static void snapshot_sig_handler(int sig);
1350static void alarm_sig_handler(int sig);
1351
1352static const struct perf_event_mmap_page *
1353perf_evlist__pick_pc(struct evlist *evlist)
1354{
1355 if (evlist) {
1356 if (evlist->mmap && evlist->mmap[0].core.base)
1357 return evlist->mmap[0].core.base;
1358 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1359 return evlist->overwrite_mmap[0].core.base;
1360 }
1361 return NULL;
1362}
1363
1364static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1365{
1366 const struct perf_event_mmap_page *pc;
1367
1368 pc = perf_evlist__pick_pc(rec->evlist);
1369 if (pc)
1370 return pc;
1371 return NULL;
1372}
1373
1374static int record__synthesize(struct record *rec, bool tail)
1375{
1376 struct perf_session *session = rec->session;
1377 struct machine *machine = &session->machines.host;
1378 struct perf_data *data = &rec->data;
1379 struct record_opts *opts = &rec->opts;
1380 struct perf_tool *tool = &rec->tool;
1381 int fd = perf_data__fd(data);
1382 int err = 0;
1383 event_op f = process_synthesized_event;
1384
1385 if (rec->opts.tail_synthesize != tail)
1386 return 0;
1387
1388 if (data->is_pipe) {
1389
1390
1391
1392
1393 err = perf_event__synthesize_attrs(tool, rec->evlist,
1394 process_synthesized_event);
1395 if (err < 0) {
1396 pr_err("Couldn't synthesize attrs.\n");
1397 goto out;
1398 }
1399
1400 err = perf_event__synthesize_features(tool, session, rec->evlist,
1401 process_synthesized_event);
1402 if (err < 0) {
1403 pr_err("Couldn't synthesize features.\n");
1404 return err;
1405 }
1406
1407 if (have_tracepoints(&rec->evlist->core.entries)) {
1408
1409
1410
1411
1412
1413
1414
1415
1416 err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
1417 process_synthesized_event);
1418 if (err <= 0) {
1419 pr_err("Couldn't record tracing data.\n");
1420 goto out;
1421 }
1422 rec->bytes_written += err;
1423 }
1424 }
1425
1426 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1427 process_synthesized_event, machine);
1428 if (err)
1429 goto out;
1430
1431
1432 if (rec->opts.auxtrace_sample_mode) {
1433 err = perf_event__synthesize_id_index(tool,
1434 process_synthesized_event,
1435 session->evlist, machine);
1436 if (err)
1437 goto out;
1438 }
1439
1440 if (rec->opts.full_auxtrace) {
1441 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1442 session, process_synthesized_event);
1443 if (err)
1444 goto out;
1445 }
1446
1447 if (!perf_evlist__exclude_kernel(rec->evlist)) {
1448 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1449 machine);
1450 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1451 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1452 "Check /proc/kallsyms permission or run as root.\n");
1453
1454 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1455 machine);
1456 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1457 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1458 "Check /proc/modules permission or run as root.\n");
1459 }
1460
1461 if (perf_guest) {
1462 machines__process_guests(&session->machines,
1463 perf_event__synthesize_guest_os, tool);
1464 }
1465
1466 err = perf_event__synthesize_extra_attr(&rec->tool,
1467 rec->evlist,
1468 process_synthesized_event,
1469 data->is_pipe);
1470 if (err)
1471 goto out;
1472
1473 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1474 process_synthesized_event,
1475 NULL);
1476 if (err < 0) {
1477 pr_err("Couldn't synthesize thread map.\n");
1478 return err;
1479 }
1480
1481 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1482 process_synthesized_event, NULL);
1483 if (err < 0) {
1484 pr_err("Couldn't synthesize cpu map.\n");
1485 return err;
1486 }
1487
1488 err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1489 machine, opts);
1490 if (err < 0)
1491 pr_warning("Couldn't synthesize bpf events.\n");
1492
1493 err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
1494 machine);
1495 if (err < 0)
1496 pr_warning("Couldn't synthesize cgroup events.\n");
1497
1498 if (rec->opts.nr_threads_synthesize > 1) {
1499 perf_set_multithreaded();
1500 f = process_locked_synthesized_event;
1501 }
1502
1503 err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1504 f, opts->sample_address,
1505 rec->opts.nr_threads_synthesize);
1506
1507 if (rec->opts.nr_threads_synthesize > 1)
1508 perf_set_singlethreaded();
1509
1510out:
1511 return err;
1512}
1513
1514static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
1515{
1516 struct record *rec = data;
1517 pthread_kill(rec->thread_id, SIGUSR2);
1518 return 0;
1519}
1520
1521static int record__setup_sb_evlist(struct record *rec)
1522{
1523 struct record_opts *opts = &rec->opts;
1524
1525 if (rec->sb_evlist != NULL) {
1526
1527
1528
1529
1530
1531 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
1532 rec->thread_id = pthread_self();
1533 }
1534#ifdef HAVE_LIBBPF_SUPPORT
1535 if (!opts->no_bpf_event) {
1536 if (rec->sb_evlist == NULL) {
1537 rec->sb_evlist = evlist__new();
1538
1539 if (rec->sb_evlist == NULL) {
1540 pr_err("Couldn't create side band evlist.\n.");
1541 return -1;
1542 }
1543 }
1544
1545 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
1546 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1547 return -1;
1548 }
1549 }
1550#endif
1551 if (perf_evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
1552 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1553 opts->no_bpf_event = true;
1554 }
1555
1556 return 0;
1557}
1558
1559static int record__init_clock(struct record *rec)
1560{
1561 struct perf_session *session = rec->session;
1562 struct timespec ref_clockid;
1563 struct timeval ref_tod;
1564 u64 ref;
1565
1566 if (!rec->opts.use_clockid)
1567 return 0;
1568
1569 if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1570 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
1571
1572 session->header.env.clock.clockid = rec->opts.clockid;
1573
1574 if (gettimeofday(&ref_tod, NULL) != 0) {
1575 pr_err("gettimeofday failed, cannot set reference time.\n");
1576 return -1;
1577 }
1578
1579 if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
1580 pr_err("clock_gettime failed, cannot set reference time.\n");
1581 return -1;
1582 }
1583
1584 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
1585 (u64) ref_tod.tv_usec * NSEC_PER_USEC;
1586
1587 session->header.env.clock.tod_ns = ref;
1588
1589 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
1590 (u64) ref_clockid.tv_nsec;
1591
1592 session->header.env.clock.clockid_ns = ref;
1593 return 0;
1594}
1595
1596static int __cmd_record(struct record *rec, int argc, const char **argv)
1597{
1598 int err;
1599 int status = 0;
1600 unsigned long waking = 0;
1601 const bool forks = argc > 0;
1602 struct perf_tool *tool = &rec->tool;
1603 struct record_opts *opts = &rec->opts;
1604 struct perf_data *data = &rec->data;
1605 struct perf_session *session;
1606 bool disabled = false, draining = false;
1607 int fd;
1608 float ratio = 0;
1609 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1610
1611 atexit(record__sig_exit);
1612 signal(SIGCHLD, sig_handler);
1613 signal(SIGINT, sig_handler);
1614 signal(SIGTERM, sig_handler);
1615 signal(SIGSEGV, sigsegv_handler);
1616
1617 if (rec->opts.record_namespaces)
1618 tool->namespace_events = true;
1619
1620 if (rec->opts.record_cgroup) {
1621#ifdef HAVE_FILE_HANDLE
1622 tool->cgroup_events = true;
1623#else
1624 pr_err("cgroup tracking is not supported\n");
1625 return -1;
1626#endif
1627 }
1628
1629 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1630 signal(SIGUSR2, snapshot_sig_handler);
1631 if (rec->opts.auxtrace_snapshot_mode)
1632 trigger_on(&auxtrace_snapshot_trigger);
1633 if (rec->switch_output.enabled)
1634 trigger_on(&switch_output_trigger);
1635 } else {
1636 signal(SIGUSR2, SIG_IGN);
1637 }
1638
1639 session = perf_session__new(data, false, tool);
1640 if (IS_ERR(session)) {
1641 pr_err("Perf session creation failed.\n");
1642 return PTR_ERR(session);
1643 }
1644
1645 fd = perf_data__fd(data);
1646 rec->session = session;
1647
1648 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1649 pr_err("Compression initialization failed.\n");
1650 return -1;
1651 }
1652#ifdef HAVE_EVENTFD_SUPPORT
1653 done_fd = eventfd(0, EFD_NONBLOCK);
1654 if (done_fd < 0) {
1655 pr_err("Failed to create wakeup eventfd, error: %m\n");
1656 status = -1;
1657 goto out_delete_session;
1658 }
1659 err = evlist__add_pollfd(rec->evlist, done_fd);
1660 if (err < 0) {
1661 pr_err("Failed to add wakeup eventfd to poll list\n");
1662 status = err;
1663 goto out_delete_session;
1664 }
1665#endif
1666
1667 session->header.env.comp_type = PERF_COMP_ZSTD;
1668 session->header.env.comp_level = rec->opts.comp_level;
1669
1670 if (rec->opts.kcore &&
1671 !record__kcore_readable(&session->machines.host)) {
1672 pr_err("ERROR: kcore is not readable.\n");
1673 return -1;
1674 }
1675
1676 if (record__init_clock(rec))
1677 return -1;
1678
1679 record__init_features(rec);
1680
1681 if (forks) {
1682 err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
1683 argv, data->is_pipe,
1684 workload_exec_failed_signal);
1685 if (err < 0) {
1686 pr_err("Couldn't run the workload!\n");
1687 status = err;
1688 goto out_delete_session;
1689 }
1690 }
1691
1692
1693
1694
1695
1696
1697
1698 if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1699 rec->opts.sample_id = true;
1700
1701 if (record__open(rec) != 0) {
1702 err = -1;
1703 goto out_child;
1704 }
1705 session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1706
1707 if (rec->opts.kcore) {
1708 err = record__kcore_copy(&session->machines.host, data);
1709 if (err) {
1710 pr_err("ERROR: Failed to copy kcore\n");
1711 goto out_child;
1712 }
1713 }
1714
1715 err = bpf__apply_obj_config();
1716 if (err) {
1717 char errbuf[BUFSIZ];
1718
1719 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1720 pr_err("ERROR: Apply config to BPF failed: %s\n",
1721 errbuf);
1722 goto out_child;
1723 }
1724
1725
1726
1727
1728
1729 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
1730 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1731 rec->tool.ordered_events = false;
1732 }
1733
1734 if (!rec->evlist->nr_groups)
1735 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1736
1737 if (data->is_pipe) {
1738 err = perf_header__write_pipe(fd);
1739 if (err < 0)
1740 goto out_child;
1741 } else {
1742 err = perf_session__write_header(session, rec->evlist, fd, false);
1743 if (err < 0)
1744 goto out_child;
1745 }
1746
1747 err = -1;
1748 if (!rec->no_buildid
1749 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1750 pr_err("Couldn't generate buildids. "
1751 "Use --no-buildid to profile anyway.\n");
1752 goto out_child;
1753 }
1754
1755 err = record__setup_sb_evlist(rec);
1756 if (err)
1757 goto out_child;
1758
1759 err = record__synthesize(rec, false);
1760 if (err < 0)
1761 goto out_child;
1762
1763 if (rec->realtime_prio) {
1764 struct sched_param param;
1765
1766 param.sched_priority = rec->realtime_prio;
1767 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
1768 pr_err("Could not set realtime priority.\n");
1769 err = -1;
1770 goto out_child;
1771 }
1772 }
1773
1774
1775
1776
1777
1778
1779 if (!target__none(&opts->target) && !opts->initial_delay)
1780 evlist__enable(rec->evlist);
1781
1782
1783
1784
1785 if (forks) {
1786 struct machine *machine = &session->machines.host;
1787 union perf_event *event;
1788 pid_t tgid;
1789
1790 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1791 if (event == NULL) {
1792 err = -ENOMEM;
1793 goto out_child;
1794 }
1795
1796
1797
1798
1799
1800
1801
1802 tgid = perf_event__synthesize_comm(tool, event,
1803 rec->evlist->workload.pid,
1804 process_synthesized_event,
1805 machine);
1806 free(event);
1807
1808 if (tgid == -1)
1809 goto out_child;
1810
1811 event = malloc(sizeof(event->namespaces) +
1812 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1813 machine->id_hdr_size);
1814 if (event == NULL) {
1815 err = -ENOMEM;
1816 goto out_child;
1817 }
1818
1819
1820
1821
1822 perf_event__synthesize_namespaces(tool, event,
1823 rec->evlist->workload.pid,
1824 tgid, process_synthesized_event,
1825 machine);
1826 free(event);
1827
1828 perf_evlist__start_workload(rec->evlist);
1829 }
1830
1831 if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
1832 goto out_child;
1833
1834 if (opts->initial_delay) {
1835 pr_info(EVLIST_DISABLED_MSG);
1836 if (opts->initial_delay > 0) {
1837 usleep(opts->initial_delay * USEC_PER_MSEC);
1838 evlist__enable(rec->evlist);
1839 pr_info(EVLIST_ENABLED_MSG);
1840 }
1841 }
1842
1843 trigger_ready(&auxtrace_snapshot_trigger);
1844 trigger_ready(&switch_output_trigger);
1845 perf_hooks__invoke_record_start();
1846 for (;;) {
1847 unsigned long long hits = rec->samples;
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1858 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1859
1860 if (record__mmap_read_all(rec, false) < 0) {
1861 trigger_error(&auxtrace_snapshot_trigger);
1862 trigger_error(&switch_output_trigger);
1863 err = -1;
1864 goto out_child;
1865 }
1866
1867 if (auxtrace_record__snapshot_started) {
1868 auxtrace_record__snapshot_started = 0;
1869 if (!trigger_is_error(&auxtrace_snapshot_trigger))
1870 record__read_auxtrace_snapshot(rec, false);
1871 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1872 pr_err("AUX area tracing snapshot failed\n");
1873 err = -1;
1874 goto out_child;
1875 }
1876 }
1877
1878 if (trigger_is_hit(&switch_output_trigger)) {
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1889 continue;
1890 trigger_ready(&switch_output_trigger);
1891
1892
1893
1894
1895
1896
1897 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1898
1899 if (!quiet)
1900 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1901 waking);
1902 waking = 0;
1903 fd = record__switch_output(rec, false);
1904 if (fd < 0) {
1905 pr_err("Failed to switch to new file\n");
1906 trigger_error(&switch_output_trigger);
1907 err = fd;
1908 goto out_child;
1909 }
1910
1911
1912 if (rec->switch_output.time)
1913 alarm(rec->switch_output.time);
1914 }
1915
1916 if (hits == rec->samples) {
1917 if (done || draining)
1918 break;
1919 err = evlist__poll(rec->evlist, -1);
1920
1921
1922
1923
1924 if (err > 0 || (err < 0 && errno == EINTR))
1925 err = 0;
1926 waking++;
1927
1928 if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1929 draining = true;
1930 }
1931
1932 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
1933 switch (cmd) {
1934 case EVLIST_CTL_CMD_ENABLE:
1935 pr_info(EVLIST_ENABLED_MSG);
1936 break;
1937 case EVLIST_CTL_CMD_DISABLE:
1938 pr_info(EVLIST_DISABLED_MSG);
1939 break;
1940 case EVLIST_CTL_CMD_ACK:
1941 case EVLIST_CTL_CMD_UNSUPPORTED:
1942 default:
1943 break;
1944 }
1945 }
1946
1947
1948
1949
1950
1951
1952 if (done && !disabled && !target__none(&opts->target)) {
1953 trigger_off(&auxtrace_snapshot_trigger);
1954 evlist__disable(rec->evlist);
1955 disabled = true;
1956 }
1957 }
1958
1959 trigger_off(&auxtrace_snapshot_trigger);
1960 trigger_off(&switch_output_trigger);
1961
1962 if (opts->auxtrace_snapshot_on_exit)
1963 record__auxtrace_snapshot_exit(rec);
1964
1965 if (forks && workload_exec_errno) {
1966 char msg[STRERR_BUFSIZE];
1967 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1968 pr_err("Workload failed: %s\n", emsg);
1969 err = -1;
1970 goto out_child;
1971 }
1972
1973 if (!quiet)
1974 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1975
1976 if (target__none(&rec->opts.target))
1977 record__synthesize_workload(rec, true);
1978
1979out_child:
1980 evlist__finalize_ctlfd(rec->evlist);
1981 record__mmap_read_all(rec, true);
1982 record__aio_mmap_read_sync(rec);
1983
1984 if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
1985 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
1986 session->header.env.comp_ratio = ratio + 0.5;
1987 }
1988
1989 if (forks) {
1990 int exit_status;
1991
1992 if (!child_finished)
1993 kill(rec->evlist->workload.pid, SIGTERM);
1994
1995 wait(&exit_status);
1996
1997 if (err < 0)
1998 status = err;
1999 else if (WIFEXITED(exit_status))
2000 status = WEXITSTATUS(exit_status);
2001 else if (WIFSIGNALED(exit_status))
2002 signr = WTERMSIG(exit_status);
2003 } else
2004 status = err;
2005
2006 record__synthesize(rec, true);
2007
2008 rec->samples = 0;
2009
2010 if (!err) {
2011 if (!rec->timestamp_filename) {
2012 record__finish_output(rec);
2013 } else {
2014 fd = record__switch_output(rec, true);
2015 if (fd < 0) {
2016 status = fd;
2017 goto out_delete_session;
2018 }
2019 }
2020 }
2021
2022 perf_hooks__invoke_record_end();
2023
2024 if (!err && !quiet) {
2025 char samples[128];
2026 const char *postfix = rec->timestamp_filename ?
2027 ".<timestamp>" : "";
2028
2029 if (rec->samples && !rec->opts.full_auxtrace)
2030 scnprintf(samples, sizeof(samples),
2031 " (%" PRIu64 " samples)", rec->samples);
2032 else
2033 samples[0] = '\0';
2034
2035 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2036 perf_data__size(data) / 1024.0 / 1024.0,
2037 data->path, postfix, samples);
2038 if (ratio) {
2039 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2040 rec->session->bytes_transferred / 1024.0 / 1024.0,
2041 ratio);
2042 }
2043 fprintf(stderr, " ]\n");
2044 }
2045
2046out_delete_session:
2047#ifdef HAVE_EVENTFD_SUPPORT
2048 if (done_fd >= 0)
2049 close(done_fd);
2050#endif
2051 zstd_fini(&session->zstd_data);
2052 perf_session__delete(session);
2053
2054 if (!opts->no_bpf_event)
2055 perf_evlist__stop_sb_thread(rec->sb_evlist);
2056 return status;
2057}
2058
2059static void callchain_debug(struct callchain_param *callchain)
2060{
2061 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2062
2063 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2064
2065 if (callchain->record_mode == CALLCHAIN_DWARF)
2066 pr_debug("callchain: stack dump size %d\n",
2067 callchain->dump_size);
2068}
2069
2070int record_opts__parse_callchain(struct record_opts *record,
2071 struct callchain_param *callchain,
2072 const char *arg, bool unset)
2073{
2074 int ret;
2075 callchain->enabled = !unset;
2076
2077
2078 if (unset) {
2079 callchain->record_mode = CALLCHAIN_NONE;
2080 pr_debug("callchain: disabled\n");
2081 return 0;
2082 }
2083
2084 ret = parse_callchain_record_opt(arg, callchain);
2085 if (!ret) {
2086
2087 if (callchain->record_mode == CALLCHAIN_DWARF)
2088 record->sample_address = true;
2089 callchain_debug(callchain);
2090 }
2091
2092 return ret;
2093}
2094
2095int record_parse_callchain_opt(const struct option *opt,
2096 const char *arg,
2097 int unset)
2098{
2099 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2100}
2101
2102int record_callchain_opt(const struct option *opt,
2103 const char *arg __maybe_unused,
2104 int unset __maybe_unused)
2105{
2106 struct callchain_param *callchain = opt->value;
2107
2108 callchain->enabled = true;
2109
2110 if (callchain->record_mode == CALLCHAIN_NONE)
2111 callchain->record_mode = CALLCHAIN_FP;
2112
2113 callchain_debug(callchain);
2114 return 0;
2115}
2116
2117static int perf_record_config(const char *var, const char *value, void *cb)
2118{
2119 struct record *rec = cb;
2120
2121 if (!strcmp(var, "record.build-id")) {
2122 if (!strcmp(value, "cache"))
2123 rec->no_buildid_cache = false;
2124 else if (!strcmp(value, "no-cache"))
2125 rec->no_buildid_cache = true;
2126 else if (!strcmp(value, "skip"))
2127 rec->no_buildid = true;
2128 else
2129 return -1;
2130 return 0;
2131 }
2132 if (!strcmp(var, "record.call-graph")) {
2133 var = "call-graph.record-mode";
2134 return perf_default_config(var, value, cb);
2135 }
2136#ifdef HAVE_AIO_SUPPORT
2137 if (!strcmp(var, "record.aio")) {
2138 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2139 if (!rec->opts.nr_cblocks)
2140 rec->opts.nr_cblocks = nr_cblocks_default;
2141 }
2142#endif
2143
2144 return 0;
2145}
2146
2147
2148static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2149{
2150 struct record_opts *opts = (struct record_opts *)opt->value;
2151
2152 if (unset || !str)
2153 return 0;
2154
2155 if (!strcasecmp(str, "node"))
2156 opts->affinity = PERF_AFFINITY_NODE;
2157 else if (!strcasecmp(str, "cpu"))
2158 opts->affinity = PERF_AFFINITY_CPU;
2159
2160 return 0;
2161}
2162
2163static int parse_output_max_size(const struct option *opt,
2164 const char *str, int unset)
2165{
2166 unsigned long *s = (unsigned long *)opt->value;
2167 static struct parse_tag tags_size[] = {
2168 { .tag = 'B', .mult = 1 },
2169 { .tag = 'K', .mult = 1 << 10 },
2170 { .tag = 'M', .mult = 1 << 20 },
2171 { .tag = 'G', .mult = 1 << 30 },
2172 { .tag = 0 },
2173 };
2174 unsigned long val;
2175
2176 if (unset) {
2177 *s = 0;
2178 return 0;
2179 }
2180
2181 val = parse_tag_value(str, tags_size);
2182 if (val != (unsigned long) -1) {
2183 *s = val;
2184 return 0;
2185 }
2186
2187 return -1;
2188}
2189
2190static int record__parse_mmap_pages(const struct option *opt,
2191 const char *str,
2192 int unset __maybe_unused)
2193{
2194 struct record_opts *opts = opt->value;
2195 char *s, *p;
2196 unsigned int mmap_pages;
2197 int ret;
2198
2199 if (!str)
2200 return -EINVAL;
2201
2202 s = strdup(str);
2203 if (!s)
2204 return -ENOMEM;
2205
2206 p = strchr(s, ',');
2207 if (p)
2208 *p = '\0';
2209
2210 if (*s) {
2211 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
2212 if (ret)
2213 goto out_free;
2214 opts->mmap_pages = mmap_pages;
2215 }
2216
2217 if (!p) {
2218 ret = 0;
2219 goto out_free;
2220 }
2221
2222 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
2223 if (ret)
2224 goto out_free;
2225
2226 opts->auxtrace_mmap_pages = mmap_pages;
2227
2228out_free:
2229 free(s);
2230 return ret;
2231}
2232
2233static int parse_control_option(const struct option *opt,
2234 const char *str,
2235 int unset __maybe_unused)
2236{
2237 char *comma = NULL, *endptr = NULL;
2238 struct record_opts *config = (struct record_opts *)opt->value;
2239
2240 if (strncmp(str, "fd:", 3))
2241 return -EINVAL;
2242
2243 config->ctl_fd = strtoul(&str[3], &endptr, 0);
2244 if (endptr == &str[3])
2245 return -EINVAL;
2246
2247 comma = strchr(str, ',');
2248 if (comma) {
2249 if (endptr != comma)
2250 return -EINVAL;
2251
2252 config->ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
2253 if (endptr == comma + 1 || *endptr != '\0')
2254 return -EINVAL;
2255 }
2256
2257 return 0;
2258}
2259
2260static void switch_output_size_warn(struct record *rec)
2261{
2262 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
2263 struct switch_output *s = &rec->switch_output;
2264
2265 wakeup_size /= 2;
2266
2267 if (s->size < wakeup_size) {
2268 char buf[100];
2269
2270 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
2271 pr_warning("WARNING: switch-output data size lower than "
2272 "wakeup kernel buffer size (%s) "
2273 "expect bigger perf.data sizes\n", buf);
2274 }
2275}
2276
2277static int switch_output_setup(struct record *rec)
2278{
2279 struct switch_output *s = &rec->switch_output;
2280 static struct parse_tag tags_size[] = {
2281 { .tag = 'B', .mult = 1 },
2282 { .tag = 'K', .mult = 1 << 10 },
2283 { .tag = 'M', .mult = 1 << 20 },
2284 { .tag = 'G', .mult = 1 << 30 },
2285 { .tag = 0 },
2286 };
2287 static struct parse_tag tags_time[] = {
2288 { .tag = 's', .mult = 1 },
2289 { .tag = 'm', .mult = 60 },
2290 { .tag = 'h', .mult = 60*60 },
2291 { .tag = 'd', .mult = 60*60*24 },
2292 { .tag = 0 },
2293 };
2294 unsigned long val;
2295
2296
2297
2298
2299
2300
2301 if (rec->switch_output_event_set)
2302 goto do_signal;
2303
2304 if (!s->set)
2305 return 0;
2306
2307 if (!strcmp(s->str, "signal")) {
2308do_signal:
2309 s->signal = true;
2310 pr_debug("switch-output with SIGUSR2 signal\n");
2311 goto enabled;
2312 }
2313
2314 val = parse_tag_value(s->str, tags_size);
2315 if (val != (unsigned long) -1) {
2316 s->size = val;
2317 pr_debug("switch-output with %s size threshold\n", s->str);
2318 goto enabled;
2319 }
2320
2321 val = parse_tag_value(s->str, tags_time);
2322 if (val != (unsigned long) -1) {
2323 s->time = val;
2324 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2325 s->str, s->time);
2326 goto enabled;
2327 }
2328
2329 return -1;
2330
2331enabled:
2332 rec->timestamp_filename = true;
2333 s->enabled = true;
2334
2335 if (s->size && !rec->opts.no_buffering)
2336 switch_output_size_warn(rec);
2337
2338 return 0;
2339}
2340
2341static const char * const __record_usage[] = {
2342 "perf record [<options>] [<command>]",
2343 "perf record [<options>] -- <command> [<options>]",
2344 NULL
2345};
2346const char * const *record_usage = __record_usage;
2347
2348static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
2349 struct perf_sample *sample, struct machine *machine)
2350{
2351
2352
2353
2354
2355 if (!(event->header.misc & PERF_RECORD_MISC_USER))
2356 return 0;
2357 return perf_event__process_mmap(tool, event, sample, machine);
2358}
2359
2360static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
2361 struct perf_sample *sample, struct machine *machine)
2362{
2363
2364
2365
2366
2367 if (!(event->header.misc & PERF_RECORD_MISC_USER))
2368 return 0;
2369
2370 return perf_event__process_mmap2(tool, event, sample, machine);
2371}
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383static struct record record = {
2384 .opts = {
2385 .sample_time = true,
2386 .mmap_pages = UINT_MAX,
2387 .user_freq = UINT_MAX,
2388 .user_interval = ULLONG_MAX,
2389 .freq = 4000,
2390 .target = {
2391 .uses_mmap = true,
2392 .default_per_cpu = true,
2393 },
2394 .mmap_flush = MMAP_FLUSH_DEFAULT,
2395 .nr_threads_synthesize = 1,
2396 .ctl_fd = -1,
2397 .ctl_fd_ack = -1,
2398 },
2399 .tool = {
2400 .sample = process_sample_event,
2401 .fork = perf_event__process_fork,
2402 .exit = perf_event__process_exit,
2403 .comm = perf_event__process_comm,
2404 .namespaces = perf_event__process_namespaces,
2405 .mmap = build_id__process_mmap,
2406 .mmap2 = build_id__process_mmap2,
2407 .ordered_events = true,
2408 },
2409};
2410
2411const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2412 "\n\t\t\t\tDefault: fp";
2413
2414static bool dry_run;
2415
2416
2417
2418
2419
2420
2421
2422
2423static struct option __record_options[] = {
2424 OPT_CALLBACK('e', "event", &record.evlist, "event",
2425 "event selector. use 'perf list' to list available events",
2426 parse_events_option),
2427 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2428 "event filter", parse_filter),
2429 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2430 NULL, "don't record events from perf itself",
2431 exclude_perf),
2432 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2433 "record events on existing process id"),
2434 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2435 "record events on existing thread id"),
2436 OPT_INTEGER('r', "realtime", &record.realtime_prio,
2437 "collect data with this RT SCHED_FIFO priority"),
2438 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2439 "collect data without buffering"),
2440 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2441 "collect raw sample records from all opened counters"),
2442 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2443 "system-wide collection from all CPUs"),
2444 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2445 "list of cpus to monitor"),
2446 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2447 OPT_STRING('o', "output", &record.data.path, "file",
2448 "output file name"),
2449 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2450 &record.opts.no_inherit_set,
2451 "child tasks do not inherit counters"),
2452 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2453 "synthesize non-sample events at the end of output"),
2454 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2455 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
2456 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2457 "Fail if the specified frequency can't be used"),
2458 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2459 "profile at this frequency",
2460 record__parse_freq),
2461 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2462 "number of mmap data pages and AUX area tracing mmap pages",
2463 record__parse_mmap_pages),
2464 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2465 "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2466 record__mmap_flush_parse),
2467 OPT_BOOLEAN(0, "group", &record.opts.group,
2468 "put the counters into a counter group"),
2469 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2470 NULL, "enables call-graph recording" ,
2471 &record_callchain_opt),
2472 OPT_CALLBACK(0, "call-graph", &record.opts,
2473 "record_mode[,record_size]", record_callchain_help,
2474 &record_parse_callchain_opt),
2475 OPT_INCR('v', "verbose", &verbose,
2476 "be more verbose (show counter open errors, etc)"),
2477 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2478 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2479 "per thread counts"),
2480 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2481 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2482 "Record the sample physical addresses"),
2483 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2484 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2485 &record.opts.sample_time_set,
2486 "Record the sample timestamps"),
2487 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2488 "Record the sample period"),
2489 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2490 "don't sample"),
2491 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2492 &record.no_buildid_cache_set,
2493 "do not update the buildid cache"),
2494 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2495 &record.no_buildid_set,
2496 "do not collect buildids in perf.data"),
2497 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2498 "monitor event in cgroup name only",
2499 parse_cgroups),
2500 OPT_INTEGER('D', "delay", &record.opts.initial_delay,
2501 "ms to wait before starting measurement after program start (-1: start with events disabled)"),
2502 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
2503 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2504 "user to profile"),
2505
2506 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2507 "branch any", "sample any taken branches",
2508 parse_branch_stack),
2509
2510 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2511 "branch filter mask", "branch stack filter modes",
2512 parse_branch_stack),
2513 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2514 "sample by weight (on special events only)"),
2515 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2516 "sample transaction flags (special events only)"),
2517 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2518 "use per-thread mmaps"),
2519 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2520 "sample selected machine registers on interrupt,"
2521 " use '-I?' to list register names", parse_intr_regs),
2522 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2523 "sample selected machine registers on interrupt,"
2524 " use '--user-regs=?' to list register names", parse_user_regs),
2525 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2526 "Record running/enabled time of read (:S) events"),
2527 OPT_CALLBACK('k', "clockid", &record.opts,
2528 "clockid", "clockid to use for events, see clock_gettime()",
2529 parse_clockid),
2530 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2531 "opts", "AUX area tracing Snapshot Mode", ""),
2532 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
2533 "opts", "sample AUX area", ""),
2534 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2535 "per thread proc mmap processing timeout in ms"),
2536 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2537 "Record namespaces events"),
2538 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
2539 "Record cgroup events"),
2540 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
2541 &record.opts.record_switch_events_set,
2542 "Record context switch events"),
2543 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2544 "Configure all used events to run in kernel space.",
2545 PARSE_OPT_EXCLUSIVE),
2546 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2547 "Configure all used events to run in user space.",
2548 PARSE_OPT_EXCLUSIVE),
2549 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2550 "collect kernel callchains"),
2551 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2552 "collect user callchains"),
2553 OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2554 "clang binary to use for compiling BPF scriptlets"),
2555 OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2556 "options passed to clang when compiling BPF scriptlets"),
2557 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2558 "file", "vmlinux pathname"),
2559 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2560 "Record build-id of all DSOs regardless of hits"),
2561 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2562 "append timestamp to output filename"),
2563 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2564 "Record timestamp boundary (time of first/last samples)"),
2565 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2566 &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2567 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2568 "signal"),
2569 OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
2570 "switch output event selector. use 'perf list' to list available events",
2571 parse_events_option_new_evlist),
2572 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2573 "Limit number of switch output generated files"),
2574 OPT_BOOLEAN(0, "dry-run", &dry_run,
2575 "Parse options then exit"),
2576#ifdef HAVE_AIO_SUPPORT
2577 OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2578 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2579 record__aio_parse),
2580#endif
2581 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2582 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2583 record__parse_affinity),
2584#ifdef HAVE_ZSTD_SUPPORT
2585 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2586 "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2587 record__parse_comp_level),
2588#endif
2589 OPT_CALLBACK(0, "max-size", &record.output_max_size,
2590 "size", "Limit the maximum size of the output file", parse_output_max_size),
2591 OPT_UINTEGER(0, "num-thread-synthesize",
2592 &record.opts.nr_threads_synthesize,
2593 "number of threads to run for event synthesis"),
2594#ifdef HAVE_LIBPFM
2595 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
2596 "libpfm4 event selector. use 'perf list' to list available events",
2597 parse_libpfm_events_option),
2598#endif
2599 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd]",
2600 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events).\n"
2601 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.",
2602 parse_control_option),
2603 OPT_END()
2604};
2605
2606struct option *record_options = __record_options;
2607
2608int cmd_record(int argc, const char **argv)
2609{
2610 int err;
2611 struct record *rec = &record;
2612 char errbuf[BUFSIZ];
2613
2614 setlocale(LC_ALL, "");
2615
2616#ifndef HAVE_LIBBPF_SUPPORT
2617# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2618 set_nobuild('\0', "clang-path", true);
2619 set_nobuild('\0', "clang-opt", true);
2620# undef set_nobuild
2621#endif
2622
2623#ifndef HAVE_BPF_PROLOGUE
2624# if !defined (HAVE_DWARF_SUPPORT)
2625# define REASON "NO_DWARF=1"
2626# elif !defined (HAVE_LIBBPF_SUPPORT)
2627# define REASON "NO_LIBBPF=1"
2628# else
2629# define REASON "this architecture doesn't support BPF prologue"
2630# endif
2631# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2632 set_nobuild('\0', "vmlinux", true);
2633# undef set_nobuild
2634# undef REASON
2635#endif
2636
2637 rec->opts.affinity = PERF_AFFINITY_SYS;
2638
2639 rec->evlist = evlist__new();
2640 if (rec->evlist == NULL)
2641 return -ENOMEM;
2642
2643 err = perf_config(perf_record_config, rec);
2644 if (err)
2645 return err;
2646
2647 argc = parse_options(argc, argv, record_options, record_usage,
2648 PARSE_OPT_STOP_AT_NON_OPTION);
2649 if (quiet)
2650 perf_quiet_option();
2651
2652
2653 if (!argc && target__none(&rec->opts.target))
2654 rec->opts.target.system_wide = true;
2655
2656 if (nr_cgroups && !rec->opts.target.system_wide) {
2657 usage_with_options_msg(record_usage, record_options,
2658 "cgroup monitoring only available in system-wide mode");
2659
2660 }
2661
2662 if (rec->opts.kcore)
2663 rec->data.is_dir = true;
2664
2665 if (rec->opts.comp_level != 0) {
2666 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2667 rec->no_buildid = true;
2668 }
2669
2670 if (rec->opts.record_switch_events &&
2671 !perf_can_record_switch_events()) {
2672 ui__error("kernel does not support recording context switch events\n");
2673 parse_options_usage(record_usage, record_options, "switch-events", 0);
2674 return -EINVAL;
2675 }
2676
2677 if (switch_output_setup(rec)) {
2678 parse_options_usage(record_usage, record_options, "switch-output", 0);
2679 return -EINVAL;
2680 }
2681
2682 if (rec->switch_output.time) {
2683 signal(SIGALRM, alarm_sig_handler);
2684 alarm(rec->switch_output.time);
2685 }
2686
2687 if (rec->switch_output.num_files) {
2688 rec->switch_output.filenames = calloc(sizeof(char *),
2689 rec->switch_output.num_files);
2690 if (!rec->switch_output.filenames)
2691 return -EINVAL;
2692 }
2693
2694
2695
2696
2697
2698 symbol_conf.allow_aliases = true;
2699
2700 symbol__init(NULL);
2701
2702 if (rec->opts.affinity != PERF_AFFINITY_SYS) {
2703 rec->affinity_mask.nbits = cpu__max_cpu();
2704 rec->affinity_mask.bits = bitmap_alloc(rec->affinity_mask.nbits);
2705 if (!rec->affinity_mask.bits) {
2706 pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits);
2707 return -ENOMEM;
2708 }
2709 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits);
2710 }
2711
2712 err = record__auxtrace_init(rec);
2713 if (err)
2714 goto out;
2715
2716 if (dry_run)
2717 goto out;
2718
2719 err = bpf__setup_stdout(rec->evlist);
2720 if (err) {
2721 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2722 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2723 errbuf);
2724 goto out;
2725 }
2726
2727 err = -ENOMEM;
2728
2729 if (rec->no_buildid_cache || rec->no_buildid) {
2730 disable_buildid_cache();
2731 } else if (rec->switch_output.enabled) {
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747 bool disable = true;
2748
2749 if (rec->no_buildid_set && !rec->no_buildid)
2750 disable = false;
2751 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2752 disable = false;
2753 if (disable) {
2754 rec->no_buildid = true;
2755 rec->no_buildid_cache = true;
2756 disable_buildid_cache();
2757 }
2758 }
2759
2760 if (record.opts.overwrite)
2761 record.opts.tail_synthesize = true;
2762
2763 if (rec->evlist->core.nr_entries == 0 &&
2764 __evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
2765 pr_err("Not enough memory for event selector list\n");
2766 goto out;
2767 }
2768
2769 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2770 rec->opts.no_inherit = true;
2771
2772 err = target__validate(&rec->opts.target);
2773 if (err) {
2774 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2775 ui__warning("%s\n", errbuf);
2776 }
2777
2778 err = target__parse_uid(&rec->opts.target);
2779 if (err) {
2780 int saved_errno = errno;
2781
2782 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2783 ui__error("%s", errbuf);
2784
2785 err = -saved_errno;
2786 goto out;
2787 }
2788
2789
2790 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2791
2792 err = -ENOMEM;
2793 if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2794 usage_with_options(record_usage, record_options);
2795
2796 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2797 if (err)
2798 goto out;
2799
2800
2801
2802
2803
2804
2805 if (rec->opts.full_auxtrace)
2806 rec->buildid_all = true;
2807
2808 if (rec->opts.text_poke) {
2809 err = record__config_text_poke(rec->evlist);
2810 if (err) {
2811 pr_err("record__config_text_poke failed, error %d\n", err);
2812 goto out;
2813 }
2814 }
2815
2816 if (record_opts__config(&rec->opts)) {
2817 err = -EINVAL;
2818 goto out;
2819 }
2820
2821 if (rec->opts.nr_cblocks > nr_cblocks_max)
2822 rec->opts.nr_cblocks = nr_cblocks_max;
2823 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2824
2825 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2826 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2827
2828 if (rec->opts.comp_level > comp_level_max)
2829 rec->opts.comp_level = comp_level_max;
2830 pr_debug("comp level: %d\n", rec->opts.comp_level);
2831
2832 err = __cmd_record(&record, argc, argv);
2833out:
2834 bitmap_free(rec->affinity_mask.bits);
2835 evlist__delete(rec->evlist);
2836 symbol__exit();
2837 auxtrace_record__free(rec->itr);
2838 return err;
2839}
2840
2841static void snapshot_sig_handler(int sig __maybe_unused)
2842{
2843 struct record *rec = &record;
2844
2845 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
2846 trigger_hit(&auxtrace_snapshot_trigger);
2847 auxtrace_record__snapshot_started = 1;
2848 if (auxtrace_record__snapshot_start(record.itr))
2849 trigger_error(&auxtrace_snapshot_trigger);
2850 }
2851
2852 if (switch_output_signal(rec))
2853 trigger_hit(&switch_output_trigger);
2854}
2855
2856static void alarm_sig_handler(int sig __maybe_unused)
2857{
2858 struct record *rec = &record;
2859
2860 if (switch_output_time(rec))
2861 trigger_hit(&switch_output_trigger);
2862}
2863