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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * builtin-record.c
4 *
5 * Builtin record command: Record the profile of a workload
6 * (or a CPU, or a PID) into the perf.data output file - for
7 * later analysis via perf report.
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/llvm-utils.h"
38#include "util/bpf-loader.h"
39#include "util/trigger.h"
40#include "util/perf-hooks.h"
41#include "util/cpu-set-sched.h"
42#include "util/synthetic-events.h"
43#include "util/time-utils.h"
44#include "util/units.h"
45#include "util/bpf-event.h"
46#include "asm/bug.h"
47#include "perf.h"
48
49#include <errno.h>
50#include <inttypes.h>
51#include <locale.h>
52#include <poll.h>
53#include <unistd.h>
54#include <sched.h>
55#include <signal.h>
56#include <sys/mman.h>
57#include <sys/wait.h>
58#include <linux/err.h>
59#include <linux/string.h>
60#include <linux/time64.h>
61#include <linux/zalloc.h>
62
63struct switch_output {
64 bool enabled;
65 bool signal;
66 unsigned long size;
67 unsigned long time;
68 const char *str;
69 bool set;
70 char **filenames;
71 int num_files;
72 int cur_file;
73};
74
75struct record {
76 struct perf_tool tool;
77 struct record_opts opts;
78 u64 bytes_written;
79 struct perf_data data;
80 struct auxtrace_record *itr;
81 struct evlist *evlist;
82 struct perf_session *session;
83 int realtime_prio;
84 bool no_buildid;
85 bool no_buildid_set;
86 bool no_buildid_cache;
87 bool no_buildid_cache_set;
88 bool buildid_all;
89 bool timestamp_filename;
90 bool timestamp_boundary;
91 struct switch_output switch_output;
92 unsigned long long samples;
93 cpu_set_t affinity_mask;
94};
95
96static volatile int auxtrace_record__snapshot_started;
97static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
98static DEFINE_TRIGGER(switch_output_trigger);
99
100static const char *affinity_tags[PERF_AFFINITY_MAX] = {
101 "SYS", "NODE", "CPU"
102};
103
104static bool switch_output_signal(struct record *rec)
105{
106 return rec->switch_output.signal &&
107 trigger_is_ready(&switch_output_trigger);
108}
109
110static bool switch_output_size(struct record *rec)
111{
112 return rec->switch_output.size &&
113 trigger_is_ready(&switch_output_trigger) &&
114 (rec->bytes_written >= rec->switch_output.size);
115}
116
117static bool switch_output_time(struct record *rec)
118{
119 return rec->switch_output.time &&
120 trigger_is_ready(&switch_output_trigger);
121}
122
123static int record__write(struct record *rec, struct mmap *map __maybe_unused,
124 void *bf, size_t size)
125{
126 struct perf_data_file *file = &rec->session->data->file;
127
128 if (perf_data_file__write(file, bf, size) < 0) {
129 pr_err("failed to write perf data, error: %m\n");
130 return -1;
131 }
132
133 rec->bytes_written += size;
134
135 if (switch_output_size(rec))
136 trigger_hit(&switch_output_trigger);
137
138 return 0;
139}
140
141static int record__aio_enabled(struct record *rec);
142static int record__comp_enabled(struct record *rec);
143static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
144 void *src, size_t src_size);
145
146#ifdef HAVE_AIO_SUPPORT
147static int record__aio_write(struct aiocb *cblock, int trace_fd,
148 void *buf, size_t size, off_t off)
149{
150 int rc;
151
152 cblock->aio_fildes = trace_fd;
153 cblock->aio_buf = buf;
154 cblock->aio_nbytes = size;
155 cblock->aio_offset = off;
156 cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
157
158 do {
159 rc = aio_write(cblock);
160 if (rc == 0) {
161 break;
162 } else if (errno != EAGAIN) {
163 cblock->aio_fildes = -1;
164 pr_err("failed to queue perf data, error: %m\n");
165 break;
166 }
167 } while (1);
168
169 return rc;
170}
171
172static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
173{
174 void *rem_buf;
175 off_t rem_off;
176 size_t rem_size;
177 int rc, aio_errno;
178 ssize_t aio_ret, written;
179
180 aio_errno = aio_error(cblock);
181 if (aio_errno == EINPROGRESS)
182 return 0;
183
184 written = aio_ret = aio_return(cblock);
185 if (aio_ret < 0) {
186 if (aio_errno != EINTR)
187 pr_err("failed to write perf data, error: %m\n");
188 written = 0;
189 }
190
191 rem_size = cblock->aio_nbytes - written;
192
193 if (rem_size == 0) {
194 cblock->aio_fildes = -1;
195 /*
196 * md->refcount is incremented in record__aio_pushfn() for
197 * every aio write request started in record__aio_push() so
198 * decrement it because the request is now complete.
199 */
200 perf_mmap__put(md);
201 rc = 1;
202 } else {
203 /*
204 * aio write request may require restart with the
205 * reminder if the kernel didn't write whole
206 * chunk at once.
207 */
208 rem_off = cblock->aio_offset + written;
209 rem_buf = (void *)(cblock->aio_buf + written);
210 record__aio_write(cblock, cblock->aio_fildes,
211 rem_buf, rem_size, rem_off);
212 rc = 0;
213 }
214
215 return rc;
216}
217
218static int record__aio_sync(struct mmap *md, bool sync_all)
219{
220 struct aiocb **aiocb = md->aio.aiocb;
221 struct aiocb *cblocks = md->aio.cblocks;
222 struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */
223 int i, do_suspend;
224
225 do {
226 do_suspend = 0;
227 for (i = 0; i < md->aio.nr_cblocks; ++i) {
228 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
229 if (sync_all)
230 aiocb[i] = NULL;
231 else
232 return i;
233 } else {
234 /*
235 * Started aio write is not complete yet
236 * so it has to be waited before the
237 * next allocation.
238 */
239 aiocb[i] = &cblocks[i];
240 do_suspend = 1;
241 }
242 }
243 if (!do_suspend)
244 return -1;
245
246 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
247 if (!(errno == EAGAIN || errno == EINTR))
248 pr_err("failed to sync perf data, error: %m\n");
249 }
250 } while (1);
251}
252
253struct record_aio {
254 struct record *rec;
255 void *data;
256 size_t size;
257};
258
259static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
260{
261 struct record_aio *aio = to;
262
263 /*
264 * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
265 * to release space in the kernel buffer as fast as possible, calling
266 * perf_mmap__consume() from perf_mmap__push() function.
267 *
268 * That lets the kernel to proceed with storing more profiling data into
269 * the kernel buffer earlier than other per-cpu kernel buffers are handled.
270 *
271 * Coping can be done in two steps in case the chunk of profiling data
272 * crosses the upper bound of the kernel buffer. In this case we first move
273 * part of data from map->start till the upper bound and then the reminder
274 * from the beginning of the kernel buffer till the end of the data chunk.
275 */
276
277 if (record__comp_enabled(aio->rec)) {
278 size = zstd_compress(aio->rec->session, aio->data + aio->size,
279 perf_mmap__mmap_len(map) - aio->size,
280 buf, size);
281 } else {
282 memcpy(aio->data + aio->size, buf, size);
283 }
284
285 if (!aio->size) {
286 /*
287 * Increment map->refcount to guard map->aio.data[] buffer
288 * from premature deallocation because map object can be
289 * released earlier than aio write request started on
290 * map->aio.data[] buffer is complete.
291 *
292 * perf_mmap__put() is done at record__aio_complete()
293 * after started aio request completion or at record__aio_push()
294 * if the request failed to start.
295 */
296 perf_mmap__get(map);
297 }
298
299 aio->size += size;
300
301 return size;
302}
303
304static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
305{
306 int ret, idx;
307 int trace_fd = rec->session->data->file.fd;
308 struct record_aio aio = { .rec = rec, .size = 0 };
309
310 /*
311 * Call record__aio_sync() to wait till map->aio.data[] buffer
312 * becomes available after previous aio write operation.
313 */
314
315 idx = record__aio_sync(map, false);
316 aio.data = map->aio.data[idx];
317 ret = perf_mmap__push(map, &aio, record__aio_pushfn);
318 if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
319 return ret;
320
321 rec->samples++;
322 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
323 if (!ret) {
324 *off += aio.size;
325 rec->bytes_written += aio.size;
326 if (switch_output_size(rec))
327 trigger_hit(&switch_output_trigger);
328 } else {
329 /*
330 * Decrement map->refcount incremented in record__aio_pushfn()
331 * back if record__aio_write() operation failed to start, otherwise
332 * map->refcount is decremented in record__aio_complete() after
333 * aio write operation finishes successfully.
334 */
335 perf_mmap__put(map);
336 }
337
338 return ret;
339}
340
341static off_t record__aio_get_pos(int trace_fd)
342{
343 return lseek(trace_fd, 0, SEEK_CUR);
344}
345
346static void record__aio_set_pos(int trace_fd, off_t pos)
347{
348 lseek(trace_fd, pos, SEEK_SET);
349}
350
351static void record__aio_mmap_read_sync(struct record *rec)
352{
353 int i;
354 struct evlist *evlist = rec->evlist;
355 struct mmap *maps = evlist->mmap;
356
357 if (!record__aio_enabled(rec))
358 return;
359
360 for (i = 0; i < evlist->core.nr_mmaps; i++) {
361 struct mmap *map = &maps[i];
362
363 if (map->core.base)
364 record__aio_sync(map, true);
365 }
366}
367
368static int nr_cblocks_default = 1;
369static int nr_cblocks_max = 4;
370
371static int record__aio_parse(const struct option *opt,
372 const char *str,
373 int unset)
374{
375 struct record_opts *opts = (struct record_opts *)opt->value;
376
377 if (unset) {
378 opts->nr_cblocks = 0;
379 } else {
380 if (str)
381 opts->nr_cblocks = strtol(str, NULL, 0);
382 if (!opts->nr_cblocks)
383 opts->nr_cblocks = nr_cblocks_default;
384 }
385
386 return 0;
387}
388#else /* HAVE_AIO_SUPPORT */
389static int nr_cblocks_max = 0;
390
391static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
392 off_t *off __maybe_unused)
393{
394 return -1;
395}
396
397static off_t record__aio_get_pos(int trace_fd __maybe_unused)
398{
399 return -1;
400}
401
402static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
403{
404}
405
406static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
407{
408}
409#endif
410
411static int record__aio_enabled(struct record *rec)
412{
413 return rec->opts.nr_cblocks > 0;
414}
415
416#define MMAP_FLUSH_DEFAULT 1
417static int record__mmap_flush_parse(const struct option *opt,
418 const char *str,
419 int unset)
420{
421 int flush_max;
422 struct record_opts *opts = (struct record_opts *)opt->value;
423 static struct parse_tag tags[] = {
424 { .tag = 'B', .mult = 1 },
425 { .tag = 'K', .mult = 1 << 10 },
426 { .tag = 'M', .mult = 1 << 20 },
427 { .tag = 'G', .mult = 1 << 30 },
428 { .tag = 0 },
429 };
430
431 if (unset)
432 return 0;
433
434 if (str) {
435 opts->mmap_flush = parse_tag_value(str, tags);
436 if (opts->mmap_flush == (int)-1)
437 opts->mmap_flush = strtol(str, NULL, 0);
438 }
439
440 if (!opts->mmap_flush)
441 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
442
443 flush_max = evlist__mmap_size(opts->mmap_pages);
444 flush_max /= 4;
445 if (opts->mmap_flush > flush_max)
446 opts->mmap_flush = flush_max;
447
448 return 0;
449}
450
451#ifdef HAVE_ZSTD_SUPPORT
452static unsigned int comp_level_default = 1;
453
454static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
455{
456 struct record_opts *opts = opt->value;
457
458 if (unset) {
459 opts->comp_level = 0;
460 } else {
461 if (str)
462 opts->comp_level = strtol(str, NULL, 0);
463 if (!opts->comp_level)
464 opts->comp_level = comp_level_default;
465 }
466
467 return 0;
468}
469#endif
470static unsigned int comp_level_max = 22;
471
472static int record__comp_enabled(struct record *rec)
473{
474 return rec->opts.comp_level > 0;
475}
476
477static int process_synthesized_event(struct perf_tool *tool,
478 union perf_event *event,
479 struct perf_sample *sample __maybe_unused,
480 struct machine *machine __maybe_unused)
481{
482 struct record *rec = container_of(tool, struct record, tool);
483 return record__write(rec, NULL, event, event->header.size);
484}
485
486static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
487{
488 struct record *rec = to;
489
490 if (record__comp_enabled(rec)) {
491 size = zstd_compress(rec->session, map->data, perf_mmap__mmap_len(map), bf, size);
492 bf = map->data;
493 }
494
495 rec->samples++;
496 return record__write(rec, map, bf, size);
497}
498
499static volatile int done;
500static volatile int signr = -1;
501static volatile int child_finished;
502
503static void sig_handler(int sig)
504{
505 if (sig == SIGCHLD)
506 child_finished = 1;
507 else
508 signr = sig;
509
510 done = 1;
511}
512
513static void sigsegv_handler(int sig)
514{
515 perf_hooks__recover();
516 sighandler_dump_stack(sig);
517}
518
519static void record__sig_exit(void)
520{
521 if (signr == -1)
522 return;
523
524 signal(signr, SIG_DFL);
525 raise(signr);
526}
527
528#ifdef HAVE_AUXTRACE_SUPPORT
529
530static int record__process_auxtrace(struct perf_tool *tool,
531 struct mmap *map,
532 union perf_event *event, void *data1,
533 size_t len1, void *data2, size_t len2)
534{
535 struct record *rec = container_of(tool, struct record, tool);
536 struct perf_data *data = &rec->data;
537 size_t padding;
538 u8 pad[8] = {0};
539
540 if (!perf_data__is_pipe(data) && !perf_data__is_dir(data)) {
541 off_t file_offset;
542 int fd = perf_data__fd(data);
543 int err;
544
545 file_offset = lseek(fd, 0, SEEK_CUR);
546 if (file_offset == -1)
547 return -1;
548 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
549 event, file_offset);
550 if (err)
551 return err;
552 }
553
554 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
555 padding = (len1 + len2) & 7;
556 if (padding)
557 padding = 8 - padding;
558
559 record__write(rec, map, event, event->header.size);
560 record__write(rec, map, data1, len1);
561 if (len2)
562 record__write(rec, map, data2, len2);
563 record__write(rec, map, &pad, padding);
564
565 return 0;
566}
567
568static int record__auxtrace_mmap_read(struct record *rec,
569 struct mmap *map)
570{
571 int ret;
572
573 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
574 record__process_auxtrace);
575 if (ret < 0)
576 return ret;
577
578 if (ret)
579 rec->samples++;
580
581 return 0;
582}
583
584static int record__auxtrace_mmap_read_snapshot(struct record *rec,
585 struct mmap *map)
586{
587 int ret;
588
589 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
590 record__process_auxtrace,
591 rec->opts.auxtrace_snapshot_size);
592 if (ret < 0)
593 return ret;
594
595 if (ret)
596 rec->samples++;
597
598 return 0;
599}
600
601static int record__auxtrace_read_snapshot_all(struct record *rec)
602{
603 int i;
604 int rc = 0;
605
606 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
607 struct mmap *map = &rec->evlist->mmap[i];
608
609 if (!map->auxtrace_mmap.base)
610 continue;
611
612 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
613 rc = -1;
614 goto out;
615 }
616 }
617out:
618 return rc;
619}
620
621static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
622{
623 pr_debug("Recording AUX area tracing snapshot\n");
624 if (record__auxtrace_read_snapshot_all(rec) < 0) {
625 trigger_error(&auxtrace_snapshot_trigger);
626 } else {
627 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
628 trigger_error(&auxtrace_snapshot_trigger);
629 else
630 trigger_ready(&auxtrace_snapshot_trigger);
631 }
632}
633
634static int record__auxtrace_snapshot_exit(struct record *rec)
635{
636 if (trigger_is_error(&auxtrace_snapshot_trigger))
637 return 0;
638
639 if (!auxtrace_record__snapshot_started &&
640 auxtrace_record__snapshot_start(rec->itr))
641 return -1;
642
643 record__read_auxtrace_snapshot(rec, true);
644 if (trigger_is_error(&auxtrace_snapshot_trigger))
645 return -1;
646
647 return 0;
648}
649
650static int record__auxtrace_init(struct record *rec)
651{
652 int err;
653
654 if (!rec->itr) {
655 rec->itr = auxtrace_record__init(rec->evlist, &err);
656 if (err)
657 return err;
658 }
659
660 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
661 rec->opts.auxtrace_snapshot_opts);
662 if (err)
663 return err;
664
665 return auxtrace_parse_filters(rec->evlist);
666}
667
668#else
669
670static inline
671int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
672 struct mmap *map __maybe_unused)
673{
674 return 0;
675}
676
677static inline
678void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
679 bool on_exit __maybe_unused)
680{
681}
682
683static inline
684int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
685{
686 return 0;
687}
688
689static inline
690int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
691{
692 return 0;
693}
694
695static int record__auxtrace_init(struct record *rec __maybe_unused)
696{
697 return 0;
698}
699
700#endif
701
702static int record__mmap_evlist(struct record *rec,
703 struct evlist *evlist)
704{
705 struct record_opts *opts = &rec->opts;
706 char msg[512];
707
708 if (opts->affinity != PERF_AFFINITY_SYS)
709 cpu__setup_cpunode_map();
710
711 if (evlist__mmap_ex(evlist, opts->mmap_pages,
712 opts->auxtrace_mmap_pages,
713 opts->auxtrace_snapshot_mode,
714 opts->nr_cblocks, opts->affinity,
715 opts->mmap_flush, opts->comp_level) < 0) {
716 if (errno == EPERM) {
717 pr_err("Permission error mapping pages.\n"
718 "Consider increasing "
719 "/proc/sys/kernel/perf_event_mlock_kb,\n"
720 "or try again with a smaller value of -m/--mmap_pages.\n"
721 "(current value: %u,%u)\n",
722 opts->mmap_pages, opts->auxtrace_mmap_pages);
723 return -errno;
724 } else {
725 pr_err("failed to mmap with %d (%s)\n", errno,
726 str_error_r(errno, msg, sizeof(msg)));
727 if (errno)
728 return -errno;
729 else
730 return -EINVAL;
731 }
732 }
733 return 0;
734}
735
736static int record__mmap(struct record *rec)
737{
738 return record__mmap_evlist(rec, rec->evlist);
739}
740
741static int record__open(struct record *rec)
742{
743 char msg[BUFSIZ];
744 struct evsel *pos;
745 struct evlist *evlist = rec->evlist;
746 struct perf_session *session = rec->session;
747 struct record_opts *opts = &rec->opts;
748 int rc = 0;
749
750 /*
751 * For initial_delay we need to add a dummy event so that we can track
752 * PERF_RECORD_MMAP while we wait for the initial delay to enable the
753 * real events, the ones asked by the user.
754 */
755 if (opts->initial_delay) {
756 if (perf_evlist__add_dummy(evlist))
757 return -ENOMEM;
758
759 pos = evlist__first(evlist);
760 pos->tracking = 0;
761 pos = evlist__last(evlist);
762 pos->tracking = 1;
763 pos->core.attr.enable_on_exec = 1;
764 }
765
766 perf_evlist__config(evlist, opts, &callchain_param);
767
768 evlist__for_each_entry(evlist, pos) {
769try_again:
770 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
771 if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
772 if (verbose > 0)
773 ui__warning("%s\n", msg);
774 goto try_again;
775 }
776 if ((errno == EINVAL || errno == EBADF) &&
777 pos->leader != pos &&
778 pos->weak_group) {
779 pos = perf_evlist__reset_weak_group(evlist, pos);
780 goto try_again;
781 }
782 rc = -errno;
783 perf_evsel__open_strerror(pos, &opts->target,
784 errno, msg, sizeof(msg));
785 ui__error("%s\n", msg);
786 goto out;
787 }
788
789 pos->supported = true;
790 }
791
792 if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(evlist)) {
793 pr_warning(
794"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
795"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
796"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
797"file is not found in the buildid cache or in the vmlinux path.\n\n"
798"Samples in kernel modules won't be resolved at all.\n\n"
799"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
800"even with a suitable vmlinux or kallsyms file.\n\n");
801 }
802
803 if (perf_evlist__apply_filters(evlist, &pos)) {
804 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
805 pos->filter, perf_evsel__name(pos), errno,
806 str_error_r(errno, msg, sizeof(msg)));
807 rc = -1;
808 goto out;
809 }
810
811 rc = record__mmap(rec);
812 if (rc)
813 goto out;
814
815 session->evlist = evlist;
816 perf_session__set_id_hdr_size(session);
817out:
818 return rc;
819}
820
821static int process_sample_event(struct perf_tool *tool,
822 union perf_event *event,
823 struct perf_sample *sample,
824 struct evsel *evsel,
825 struct machine *machine)
826{
827 struct record *rec = container_of(tool, struct record, tool);
828
829 if (rec->evlist->first_sample_time == 0)
830 rec->evlist->first_sample_time = sample->time;
831
832 rec->evlist->last_sample_time = sample->time;
833
834 if (rec->buildid_all)
835 return 0;
836
837 rec->samples++;
838 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
839}
840
841static int process_buildids(struct record *rec)
842{
843 struct perf_session *session = rec->session;
844
845 if (perf_data__size(&rec->data) == 0)
846 return 0;
847
848 /*
849 * During this process, it'll load kernel map and replace the
850 * dso->long_name to a real pathname it found. In this case
851 * we prefer the vmlinux path like
852 * /lib/modules/3.16.4/build/vmlinux
853 *
854 * rather than build-id path (in debug directory).
855 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
856 */
857 symbol_conf.ignore_vmlinux_buildid = true;
858
859 /*
860 * If --buildid-all is given, it marks all DSO regardless of hits,
861 * so no need to process samples. But if timestamp_boundary is enabled,
862 * it still needs to walk on all samples to get the timestamps of
863 * first/last samples.
864 */
865 if (rec->buildid_all && !rec->timestamp_boundary)
866 rec->tool.sample = NULL;
867
868 return perf_session__process_events(session);
869}
870
871static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
872{
873 int err;
874 struct perf_tool *tool = data;
875 /*
876 *As for guest kernel when processing subcommand record&report,
877 *we arrange module mmap prior to guest kernel mmap and trigger
878 *a preload dso because default guest module symbols are loaded
879 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
880 *method is used to avoid symbol missing when the first addr is
881 *in module instead of in guest kernel.
882 */
883 err = perf_event__synthesize_modules(tool, process_synthesized_event,
884 machine);
885 if (err < 0)
886 pr_err("Couldn't record guest kernel [%d]'s reference"
887 " relocation symbol.\n", machine->pid);
888
889 /*
890 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
891 * have no _text sometimes.
892 */
893 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
894 machine);
895 if (err < 0)
896 pr_err("Couldn't record guest kernel [%d]'s reference"
897 " relocation symbol.\n", machine->pid);
898}
899
900static struct perf_event_header finished_round_event = {
901 .size = sizeof(struct perf_event_header),
902 .type = PERF_RECORD_FINISHED_ROUND,
903};
904
905static void record__adjust_affinity(struct record *rec, struct mmap *map)
906{
907 if (rec->opts.affinity != PERF_AFFINITY_SYS &&
908 !CPU_EQUAL(&rec->affinity_mask, &map->affinity_mask)) {
909 CPU_ZERO(&rec->affinity_mask);
910 CPU_OR(&rec->affinity_mask, &rec->affinity_mask, &map->affinity_mask);
911 sched_setaffinity(0, sizeof(rec->affinity_mask), &rec->affinity_mask);
912 }
913}
914
915static size_t process_comp_header(void *record, size_t increment)
916{
917 struct perf_record_compressed *event = record;
918 size_t size = sizeof(*event);
919
920 if (increment) {
921 event->header.size += increment;
922 return increment;
923 }
924
925 event->header.type = PERF_RECORD_COMPRESSED;
926 event->header.size = size;
927
928 return size;
929}
930
931static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
932 void *src, size_t src_size)
933{
934 size_t compressed;
935 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
936
937 compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
938 max_record_size, process_comp_header);
939
940 session->bytes_transferred += src_size;
941 session->bytes_compressed += compressed;
942
943 return compressed;
944}
945
946static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
947 bool overwrite, bool synch)
948{
949 u64 bytes_written = rec->bytes_written;
950 int i;
951 int rc = 0;
952 struct mmap *maps;
953 int trace_fd = rec->data.file.fd;
954 off_t off = 0;
955
956 if (!evlist)
957 return 0;
958
959 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
960 if (!maps)
961 return 0;
962
963 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
964 return 0;
965
966 if (record__aio_enabled(rec))
967 off = record__aio_get_pos(trace_fd);
968
969 for (i = 0; i < evlist->core.nr_mmaps; i++) {
970 u64 flush = 0;
971 struct mmap *map = &maps[i];
972
973 if (map->core.base) {
974 record__adjust_affinity(rec, map);
975 if (synch) {
976 flush = map->core.flush;
977 map->core.flush = 1;
978 }
979 if (!record__aio_enabled(rec)) {
980 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
981 if (synch)
982 map->core.flush = flush;
983 rc = -1;
984 goto out;
985 }
986 } else {
987 if (record__aio_push(rec, map, &off) < 0) {
988 record__aio_set_pos(trace_fd, off);
989 if (synch)
990 map->core.flush = flush;
991 rc = -1;
992 goto out;
993 }
994 }
995 if (synch)
996 map->core.flush = flush;
997 }
998
999 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1000 record__auxtrace_mmap_read(rec, map) != 0) {
1001 rc = -1;
1002 goto out;
1003 }
1004 }
1005
1006 if (record__aio_enabled(rec))
1007 record__aio_set_pos(trace_fd, off);
1008
1009 /*
1010 * Mark the round finished in case we wrote
1011 * at least one event.
1012 */
1013 if (bytes_written != rec->bytes_written)
1014 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1015
1016 if (overwrite)
1017 perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1018out:
1019 return rc;
1020}
1021
1022static int record__mmap_read_all(struct record *rec, bool synch)
1023{
1024 int err;
1025
1026 err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1027 if (err)
1028 return err;
1029
1030 return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1031}
1032
1033static void record__init_features(struct record *rec)
1034{
1035 struct perf_session *session = rec->session;
1036 int feat;
1037
1038 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1039 perf_header__set_feat(&session->header, feat);
1040
1041 if (rec->no_buildid)
1042 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1043
1044 if (!have_tracepoints(&rec->evlist->core.entries))
1045 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1046
1047 if (!rec->opts.branch_stack)
1048 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1049
1050 if (!rec->opts.full_auxtrace)
1051 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1052
1053 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1054 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1055
1056 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1057 if (!record__comp_enabled(rec))
1058 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1059
1060 perf_header__clear_feat(&session->header, HEADER_STAT);
1061}
1062
1063static void
1064record__finish_output(struct record *rec)
1065{
1066 struct perf_data *data = &rec->data;
1067 int fd = perf_data__fd(data);
1068
1069 if (data->is_pipe)
1070 return;
1071
1072 rec->session->header.data_size += rec->bytes_written;
1073 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1074
1075 if (!rec->no_buildid) {
1076 process_buildids(rec);
1077
1078 if (rec->buildid_all)
1079 dsos__hit_all(rec->session);
1080 }
1081 perf_session__write_header(rec->session, rec->evlist, fd, true);
1082
1083 return;
1084}
1085
1086static int record__synthesize_workload(struct record *rec, bool tail)
1087{
1088 int err;
1089 struct perf_thread_map *thread_map;
1090
1091 if (rec->opts.tail_synthesize != tail)
1092 return 0;
1093
1094 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1095 if (thread_map == NULL)
1096 return -1;
1097
1098 err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1099 process_synthesized_event,
1100 &rec->session->machines.host,
1101 rec->opts.sample_address);
1102 perf_thread_map__put(thread_map);
1103 return err;
1104}
1105
1106static int record__synthesize(struct record *rec, bool tail);
1107
1108static int
1109record__switch_output(struct record *rec, bool at_exit)
1110{
1111 struct perf_data *data = &rec->data;
1112 int fd, err;
1113 char *new_filename;
1114
1115 /* Same Size: "2015122520103046"*/
1116 char timestamp[] = "InvalidTimestamp";
1117
1118 record__aio_mmap_read_sync(rec);
1119
1120 record__synthesize(rec, true);
1121 if (target__none(&rec->opts.target))
1122 record__synthesize_workload(rec, true);
1123
1124 rec->samples = 0;
1125 record__finish_output(rec);
1126 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1127 if (err) {
1128 pr_err("Failed to get current timestamp\n");
1129 return -EINVAL;
1130 }
1131
1132 fd = perf_data__switch(data, timestamp,
1133 rec->session->header.data_offset,
1134 at_exit, &new_filename);
1135 if (fd >= 0 && !at_exit) {
1136 rec->bytes_written = 0;
1137 rec->session->header.data_size = 0;
1138 }
1139
1140 if (!quiet)
1141 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1142 data->path, timestamp);
1143
1144 if (rec->switch_output.num_files) {
1145 int n = rec->switch_output.cur_file + 1;
1146
1147 if (n >= rec->switch_output.num_files)
1148 n = 0;
1149 rec->switch_output.cur_file = n;
1150 if (rec->switch_output.filenames[n]) {
1151 remove(rec->switch_output.filenames[n]);
1152 zfree(&rec->switch_output.filenames[n]);
1153 }
1154 rec->switch_output.filenames[n] = new_filename;
1155 } else {
1156 free(new_filename);
1157 }
1158
1159 /* Output tracking events */
1160 if (!at_exit) {
1161 record__synthesize(rec, false);
1162
1163 /*
1164 * In 'perf record --switch-output' without -a,
1165 * record__synthesize() in record__switch_output() won't
1166 * generate tracking events because there's no thread_map
1167 * in evlist. Which causes newly created perf.data doesn't
1168 * contain map and comm information.
1169 * Create a fake thread_map and directly call
1170 * perf_event__synthesize_thread_map() for those events.
1171 */
1172 if (target__none(&rec->opts.target))
1173 record__synthesize_workload(rec, false);
1174 }
1175 return fd;
1176}
1177
1178static volatile int workload_exec_errno;
1179
1180/*
1181 * perf_evlist__prepare_workload will send a SIGUSR1
1182 * if the fork fails, since we asked by setting its
1183 * want_signal to true.
1184 */
1185static void workload_exec_failed_signal(int signo __maybe_unused,
1186 siginfo_t *info,
1187 void *ucontext __maybe_unused)
1188{
1189 workload_exec_errno = info->si_value.sival_int;
1190 done = 1;
1191 child_finished = 1;
1192}
1193
1194static void snapshot_sig_handler(int sig);
1195static void alarm_sig_handler(int sig);
1196
1197static const struct perf_event_mmap_page *
1198perf_evlist__pick_pc(struct evlist *evlist)
1199{
1200 if (evlist) {
1201 if (evlist->mmap && evlist->mmap[0].core.base)
1202 return evlist->mmap[0].core.base;
1203 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1204 return evlist->overwrite_mmap[0].core.base;
1205 }
1206 return NULL;
1207}
1208
1209static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1210{
1211 const struct perf_event_mmap_page *pc;
1212
1213 pc = perf_evlist__pick_pc(rec->evlist);
1214 if (pc)
1215 return pc;
1216 return NULL;
1217}
1218
1219static int record__synthesize(struct record *rec, bool tail)
1220{
1221 struct perf_session *session = rec->session;
1222 struct machine *machine = &session->machines.host;
1223 struct perf_data *data = &rec->data;
1224 struct record_opts *opts = &rec->opts;
1225 struct perf_tool *tool = &rec->tool;
1226 int fd = perf_data__fd(data);
1227 int err = 0;
1228
1229 if (rec->opts.tail_synthesize != tail)
1230 return 0;
1231
1232 if (data->is_pipe) {
1233 /*
1234 * We need to synthesize events first, because some
1235 * features works on top of them (on report side).
1236 */
1237 err = perf_event__synthesize_attrs(tool, rec->evlist,
1238 process_synthesized_event);
1239 if (err < 0) {
1240 pr_err("Couldn't synthesize attrs.\n");
1241 goto out;
1242 }
1243
1244 err = perf_event__synthesize_features(tool, session, rec->evlist,
1245 process_synthesized_event);
1246 if (err < 0) {
1247 pr_err("Couldn't synthesize features.\n");
1248 return err;
1249 }
1250
1251 if (have_tracepoints(&rec->evlist->core.entries)) {
1252 /*
1253 * FIXME err <= 0 here actually means that
1254 * there were no tracepoints so its not really
1255 * an error, just that we don't need to
1256 * synthesize anything. We really have to
1257 * return this more properly and also
1258 * propagate errors that now are calling die()
1259 */
1260 err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
1261 process_synthesized_event);
1262 if (err <= 0) {
1263 pr_err("Couldn't record tracing data.\n");
1264 goto out;
1265 }
1266 rec->bytes_written += err;
1267 }
1268 }
1269
1270 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1271 process_synthesized_event, machine);
1272 if (err)
1273 goto out;
1274
1275 if (rec->opts.full_auxtrace) {
1276 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1277 session, process_synthesized_event);
1278 if (err)
1279 goto out;
1280 }
1281
1282 if (!perf_evlist__exclude_kernel(rec->evlist)) {
1283 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1284 machine);
1285 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1286 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1287 "Check /proc/kallsyms permission or run as root.\n");
1288
1289 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1290 machine);
1291 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1292 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1293 "Check /proc/modules permission or run as root.\n");
1294 }
1295
1296 if (perf_guest) {
1297 machines__process_guests(&session->machines,
1298 perf_event__synthesize_guest_os, tool);
1299 }
1300
1301 err = perf_event__synthesize_extra_attr(&rec->tool,
1302 rec->evlist,
1303 process_synthesized_event,
1304 data->is_pipe);
1305 if (err)
1306 goto out;
1307
1308 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1309 process_synthesized_event,
1310 NULL);
1311 if (err < 0) {
1312 pr_err("Couldn't synthesize thread map.\n");
1313 return err;
1314 }
1315
1316 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1317 process_synthesized_event, NULL);
1318 if (err < 0) {
1319 pr_err("Couldn't synthesize cpu map.\n");
1320 return err;
1321 }
1322
1323 err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1324 machine, opts);
1325 if (err < 0)
1326 pr_warning("Couldn't synthesize bpf events.\n");
1327
1328 err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1329 process_synthesized_event, opts->sample_address,
1330 1);
1331out:
1332 return err;
1333}
1334
1335static int __cmd_record(struct record *rec, int argc, const char **argv)
1336{
1337 int err;
1338 int status = 0;
1339 unsigned long waking = 0;
1340 const bool forks = argc > 0;
1341 struct perf_tool *tool = &rec->tool;
1342 struct record_opts *opts = &rec->opts;
1343 struct perf_data *data = &rec->data;
1344 struct perf_session *session;
1345 bool disabled = false, draining = false;
1346 struct evlist *sb_evlist = NULL;
1347 int fd;
1348 float ratio = 0;
1349
1350 atexit(record__sig_exit);
1351 signal(SIGCHLD, sig_handler);
1352 signal(SIGINT, sig_handler);
1353 signal(SIGTERM, sig_handler);
1354 signal(SIGSEGV, sigsegv_handler);
1355
1356 if (rec->opts.record_namespaces)
1357 tool->namespace_events = true;
1358
1359 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1360 signal(SIGUSR2, snapshot_sig_handler);
1361 if (rec->opts.auxtrace_snapshot_mode)
1362 trigger_on(&auxtrace_snapshot_trigger);
1363 if (rec->switch_output.enabled)
1364 trigger_on(&switch_output_trigger);
1365 } else {
1366 signal(SIGUSR2, SIG_IGN);
1367 }
1368
1369 session = perf_session__new(data, false, tool);
1370 if (IS_ERR(session)) {
1371 pr_err("Perf session creation failed.\n");
1372 return PTR_ERR(session);
1373 }
1374
1375 fd = perf_data__fd(data);
1376 rec->session = session;
1377
1378 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1379 pr_err("Compression initialization failed.\n");
1380 return -1;
1381 }
1382
1383 session->header.env.comp_type = PERF_COMP_ZSTD;
1384 session->header.env.comp_level = rec->opts.comp_level;
1385
1386 record__init_features(rec);
1387
1388 if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1389 session->header.env.clockid_res_ns = rec->opts.clockid_res_ns;
1390
1391 if (forks) {
1392 err = perf_evlist__prepare_workload(rec->evlist, &opts->target,
1393 argv, data->is_pipe,
1394 workload_exec_failed_signal);
1395 if (err < 0) {
1396 pr_err("Couldn't run the workload!\n");
1397 status = err;
1398 goto out_delete_session;
1399 }
1400 }
1401
1402 /*
1403 * If we have just single event and are sending data
1404 * through pipe, we need to force the ids allocation,
1405 * because we synthesize event name through the pipe
1406 * and need the id for that.
1407 */
1408 if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1409 rec->opts.sample_id = true;
1410
1411 if (record__open(rec) != 0) {
1412 err = -1;
1413 goto out_child;
1414 }
1415 session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1416
1417 err = bpf__apply_obj_config();
1418 if (err) {
1419 char errbuf[BUFSIZ];
1420
1421 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1422 pr_err("ERROR: Apply config to BPF failed: %s\n",
1423 errbuf);
1424 goto out_child;
1425 }
1426
1427 /*
1428 * Normally perf_session__new would do this, but it doesn't have the
1429 * evlist.
1430 */
1431 if (rec->tool.ordered_events && !perf_evlist__sample_id_all(rec->evlist)) {
1432 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1433 rec->tool.ordered_events = false;
1434 }
1435
1436 if (!rec->evlist->nr_groups)
1437 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1438
1439 if (data->is_pipe) {
1440 err = perf_header__write_pipe(fd);
1441 if (err < 0)
1442 goto out_child;
1443 } else {
1444 err = perf_session__write_header(session, rec->evlist, fd, false);
1445 if (err < 0)
1446 goto out_child;
1447 }
1448
1449 if (!rec->no_buildid
1450 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1451 pr_err("Couldn't generate buildids. "
1452 "Use --no-buildid to profile anyway.\n");
1453 err = -1;
1454 goto out_child;
1455 }
1456
1457 if (!opts->no_bpf_event)
1458 bpf_event__add_sb_event(&sb_evlist, &session->header.env);
1459
1460 if (perf_evlist__start_sb_thread(sb_evlist, &rec->opts.target)) {
1461 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1462 opts->no_bpf_event = true;
1463 }
1464
1465 err = record__synthesize(rec, false);
1466 if (err < 0)
1467 goto out_child;
1468
1469 if (rec->realtime_prio) {
1470 struct sched_param param;
1471
1472 param.sched_priority = rec->realtime_prio;
1473 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
1474 pr_err("Could not set realtime priority.\n");
1475 err = -1;
1476 goto out_child;
1477 }
1478 }
1479
1480 /*
1481 * When perf is starting the traced process, all the events
1482 * (apart from group members) have enable_on_exec=1 set,
1483 * so don't spoil it by prematurely enabling them.
1484 */
1485 if (!target__none(&opts->target) && !opts->initial_delay)
1486 evlist__enable(rec->evlist);
1487
1488 /*
1489 * Let the child rip
1490 */
1491 if (forks) {
1492 struct machine *machine = &session->machines.host;
1493 union perf_event *event;
1494 pid_t tgid;
1495
1496 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1497 if (event == NULL) {
1498 err = -ENOMEM;
1499 goto out_child;
1500 }
1501
1502 /*
1503 * Some H/W events are generated before COMM event
1504 * which is emitted during exec(), so perf script
1505 * cannot see a correct process name for those events.
1506 * Synthesize COMM event to prevent it.
1507 */
1508 tgid = perf_event__synthesize_comm(tool, event,
1509 rec->evlist->workload.pid,
1510 process_synthesized_event,
1511 machine);
1512 free(event);
1513
1514 if (tgid == -1)
1515 goto out_child;
1516
1517 event = malloc(sizeof(event->namespaces) +
1518 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1519 machine->id_hdr_size);
1520 if (event == NULL) {
1521 err = -ENOMEM;
1522 goto out_child;
1523 }
1524
1525 /*
1526 * Synthesize NAMESPACES event for the command specified.
1527 */
1528 perf_event__synthesize_namespaces(tool, event,
1529 rec->evlist->workload.pid,
1530 tgid, process_synthesized_event,
1531 machine);
1532 free(event);
1533
1534 perf_evlist__start_workload(rec->evlist);
1535 }
1536
1537 if (opts->initial_delay) {
1538 usleep(opts->initial_delay * USEC_PER_MSEC);
1539 evlist__enable(rec->evlist);
1540 }
1541
1542 trigger_ready(&auxtrace_snapshot_trigger);
1543 trigger_ready(&switch_output_trigger);
1544 perf_hooks__invoke_record_start();
1545 for (;;) {
1546 unsigned long long hits = rec->samples;
1547
1548 /*
1549 * rec->evlist->bkw_mmap_state is possible to be
1550 * BKW_MMAP_EMPTY here: when done == true and
1551 * hits != rec->samples in previous round.
1552 *
1553 * perf_evlist__toggle_bkw_mmap ensure we never
1554 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
1555 */
1556 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1557 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1558
1559 if (record__mmap_read_all(rec, false) < 0) {
1560 trigger_error(&auxtrace_snapshot_trigger);
1561 trigger_error(&switch_output_trigger);
1562 err = -1;
1563 goto out_child;
1564 }
1565
1566 if (auxtrace_record__snapshot_started) {
1567 auxtrace_record__snapshot_started = 0;
1568 if (!trigger_is_error(&auxtrace_snapshot_trigger))
1569 record__read_auxtrace_snapshot(rec, false);
1570 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1571 pr_err("AUX area tracing snapshot failed\n");
1572 err = -1;
1573 goto out_child;
1574 }
1575 }
1576
1577 if (trigger_is_hit(&switch_output_trigger)) {
1578 /*
1579 * If switch_output_trigger is hit, the data in
1580 * overwritable ring buffer should have been collected,
1581 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1582 *
1583 * If SIGUSR2 raise after or during record__mmap_read_all(),
1584 * record__mmap_read_all() didn't collect data from
1585 * overwritable ring buffer. Read again.
1586 */
1587 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1588 continue;
1589 trigger_ready(&switch_output_trigger);
1590
1591 /*
1592 * Reenable events in overwrite ring buffer after
1593 * record__mmap_read_all(): we should have collected
1594 * data from it.
1595 */
1596 perf_evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1597
1598 if (!quiet)
1599 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1600 waking);
1601 waking = 0;
1602 fd = record__switch_output(rec, false);
1603 if (fd < 0) {
1604 pr_err("Failed to switch to new file\n");
1605 trigger_error(&switch_output_trigger);
1606 err = fd;
1607 goto out_child;
1608 }
1609
1610 /* re-arm the alarm */
1611 if (rec->switch_output.time)
1612 alarm(rec->switch_output.time);
1613 }
1614
1615 if (hits == rec->samples) {
1616 if (done || draining)
1617 break;
1618 err = evlist__poll(rec->evlist, -1);
1619 /*
1620 * Propagate error, only if there's any. Ignore positive
1621 * number of returned events and interrupt error.
1622 */
1623 if (err > 0 || (err < 0 && errno == EINTR))
1624 err = 0;
1625 waking++;
1626
1627 if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1628 draining = true;
1629 }
1630
1631 /*
1632 * When perf is starting the traced process, at the end events
1633 * die with the process and we wait for that. Thus no need to
1634 * disable events in this case.
1635 */
1636 if (done && !disabled && !target__none(&opts->target)) {
1637 trigger_off(&auxtrace_snapshot_trigger);
1638 evlist__disable(rec->evlist);
1639 disabled = true;
1640 }
1641 }
1642
1643 trigger_off(&auxtrace_snapshot_trigger);
1644 trigger_off(&switch_output_trigger);
1645
1646 if (opts->auxtrace_snapshot_on_exit)
1647 record__auxtrace_snapshot_exit(rec);
1648
1649 if (forks && workload_exec_errno) {
1650 char msg[STRERR_BUFSIZE];
1651 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1652 pr_err("Workload failed: %s\n", emsg);
1653 err = -1;
1654 goto out_child;
1655 }
1656
1657 if (!quiet)
1658 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1659
1660 if (target__none(&rec->opts.target))
1661 record__synthesize_workload(rec, true);
1662
1663out_child:
1664 record__mmap_read_all(rec, true);
1665 record__aio_mmap_read_sync(rec);
1666
1667 if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
1668 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
1669 session->header.env.comp_ratio = ratio + 0.5;
1670 }
1671
1672 if (forks) {
1673 int exit_status;
1674
1675 if (!child_finished)
1676 kill(rec->evlist->workload.pid, SIGTERM);
1677
1678 wait(&exit_status);
1679
1680 if (err < 0)
1681 status = err;
1682 else if (WIFEXITED(exit_status))
1683 status = WEXITSTATUS(exit_status);
1684 else if (WIFSIGNALED(exit_status))
1685 signr = WTERMSIG(exit_status);
1686 } else
1687 status = err;
1688
1689 record__synthesize(rec, true);
1690 /* this will be recalculated during process_buildids() */
1691 rec->samples = 0;
1692
1693 if (!err) {
1694 if (!rec->timestamp_filename) {
1695 record__finish_output(rec);
1696 } else {
1697 fd = record__switch_output(rec, true);
1698 if (fd < 0) {
1699 status = fd;
1700 goto out_delete_session;
1701 }
1702 }
1703 }
1704
1705 perf_hooks__invoke_record_end();
1706
1707 if (!err && !quiet) {
1708 char samples[128];
1709 const char *postfix = rec->timestamp_filename ?
1710 ".<timestamp>" : "";
1711
1712 if (rec->samples && !rec->opts.full_auxtrace)
1713 scnprintf(samples, sizeof(samples),
1714 " (%" PRIu64 " samples)", rec->samples);
1715 else
1716 samples[0] = '\0';
1717
1718 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
1719 perf_data__size(data) / 1024.0 / 1024.0,
1720 data->path, postfix, samples);
1721 if (ratio) {
1722 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
1723 rec->session->bytes_transferred / 1024.0 / 1024.0,
1724 ratio);
1725 }
1726 fprintf(stderr, " ]\n");
1727 }
1728
1729out_delete_session:
1730 zstd_fini(&session->zstd_data);
1731 perf_session__delete(session);
1732
1733 if (!opts->no_bpf_event)
1734 perf_evlist__stop_sb_thread(sb_evlist);
1735 return status;
1736}
1737
1738static void callchain_debug(struct callchain_param *callchain)
1739{
1740 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
1741
1742 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
1743
1744 if (callchain->record_mode == CALLCHAIN_DWARF)
1745 pr_debug("callchain: stack dump size %d\n",
1746 callchain->dump_size);
1747}
1748
1749int record_opts__parse_callchain(struct record_opts *record,
1750 struct callchain_param *callchain,
1751 const char *arg, bool unset)
1752{
1753 int ret;
1754 callchain->enabled = !unset;
1755
1756 /* --no-call-graph */
1757 if (unset) {
1758 callchain->record_mode = CALLCHAIN_NONE;
1759 pr_debug("callchain: disabled\n");
1760 return 0;
1761 }
1762
1763 ret = parse_callchain_record_opt(arg, callchain);
1764 if (!ret) {
1765 /* Enable data address sampling for DWARF unwind. */
1766 if (callchain->record_mode == CALLCHAIN_DWARF)
1767 record->sample_address = true;
1768 callchain_debug(callchain);
1769 }
1770
1771 return ret;
1772}
1773
1774int record_parse_callchain_opt(const struct option *opt,
1775 const char *arg,
1776 int unset)
1777{
1778 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
1779}
1780
1781int record_callchain_opt(const struct option *opt,
1782 const char *arg __maybe_unused,
1783 int unset __maybe_unused)
1784{
1785 struct callchain_param *callchain = opt->value;
1786
1787 callchain->enabled = true;
1788
1789 if (callchain->record_mode == CALLCHAIN_NONE)
1790 callchain->record_mode = CALLCHAIN_FP;
1791
1792 callchain_debug(callchain);
1793 return 0;
1794}
1795
1796static int perf_record_config(const char *var, const char *value, void *cb)
1797{
1798 struct record *rec = cb;
1799
1800 if (!strcmp(var, "record.build-id")) {
1801 if (!strcmp(value, "cache"))
1802 rec->no_buildid_cache = false;
1803 else if (!strcmp(value, "no-cache"))
1804 rec->no_buildid_cache = true;
1805 else if (!strcmp(value, "skip"))
1806 rec->no_buildid = true;
1807 else
1808 return -1;
1809 return 0;
1810 }
1811 if (!strcmp(var, "record.call-graph")) {
1812 var = "call-graph.record-mode";
1813 return perf_default_config(var, value, cb);
1814 }
1815#ifdef HAVE_AIO_SUPPORT
1816 if (!strcmp(var, "record.aio")) {
1817 rec->opts.nr_cblocks = strtol(value, NULL, 0);
1818 if (!rec->opts.nr_cblocks)
1819 rec->opts.nr_cblocks = nr_cblocks_default;
1820 }
1821#endif
1822
1823 return 0;
1824}
1825
1826struct clockid_map {
1827 const char *name;
1828 int clockid;
1829};
1830
1831#define CLOCKID_MAP(n, c) \
1832 { .name = n, .clockid = (c), }
1833
1834#define CLOCKID_END { .name = NULL, }
1835
1836
1837/*
1838 * Add the missing ones, we need to build on many distros...
1839 */
1840#ifndef CLOCK_MONOTONIC_RAW
1841#define CLOCK_MONOTONIC_RAW 4
1842#endif
1843#ifndef CLOCK_BOOTTIME
1844#define CLOCK_BOOTTIME 7
1845#endif
1846#ifndef CLOCK_TAI
1847#define CLOCK_TAI 11
1848#endif
1849
1850static const struct clockid_map clockids[] = {
1851 /* available for all events, NMI safe */
1852 CLOCKID_MAP("monotonic", CLOCK_MONOTONIC),
1853 CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW),
1854
1855 /* available for some events */
1856 CLOCKID_MAP("realtime", CLOCK_REALTIME),
1857 CLOCKID_MAP("boottime", CLOCK_BOOTTIME),
1858 CLOCKID_MAP("tai", CLOCK_TAI),
1859
1860 /* available for the lazy */
1861 CLOCKID_MAP("mono", CLOCK_MONOTONIC),
1862 CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW),
1863 CLOCKID_MAP("real", CLOCK_REALTIME),
1864 CLOCKID_MAP("boot", CLOCK_BOOTTIME),
1865
1866 CLOCKID_END,
1867};
1868
1869static int get_clockid_res(clockid_t clk_id, u64 *res_ns)
1870{
1871 struct timespec res;
1872
1873 *res_ns = 0;
1874 if (!clock_getres(clk_id, &res))
1875 *res_ns = res.tv_nsec + res.tv_sec * NSEC_PER_SEC;
1876 else
1877 pr_warning("WARNING: Failed to determine specified clock resolution.\n");
1878
1879 return 0;
1880}
1881
1882static int parse_clockid(const struct option *opt, const char *str, int unset)
1883{
1884 struct record_opts *opts = (struct record_opts *)opt->value;
1885 const struct clockid_map *cm;
1886 const char *ostr = str;
1887
1888 if (unset) {
1889 opts->use_clockid = 0;
1890 return 0;
1891 }
1892
1893 /* no arg passed */
1894 if (!str)
1895 return 0;
1896
1897 /* no setting it twice */
1898 if (opts->use_clockid)
1899 return -1;
1900
1901 opts->use_clockid = true;
1902
1903 /* if its a number, we're done */
1904 if (sscanf(str, "%d", &opts->clockid) == 1)
1905 return get_clockid_res(opts->clockid, &opts->clockid_res_ns);
1906
1907 /* allow a "CLOCK_" prefix to the name */
1908 if (!strncasecmp(str, "CLOCK_", 6))
1909 str += 6;
1910
1911 for (cm = clockids; cm->name; cm++) {
1912 if (!strcasecmp(str, cm->name)) {
1913 opts->clockid = cm->clockid;
1914 return get_clockid_res(opts->clockid,
1915 &opts->clockid_res_ns);
1916 }
1917 }
1918
1919 opts->use_clockid = false;
1920 ui__warning("unknown clockid %s, check man page\n", ostr);
1921 return -1;
1922}
1923
1924static int record__parse_affinity(const struct option *opt, const char *str, int unset)
1925{
1926 struct record_opts *opts = (struct record_opts *)opt->value;
1927
1928 if (unset || !str)
1929 return 0;
1930
1931 if (!strcasecmp(str, "node"))
1932 opts->affinity = PERF_AFFINITY_NODE;
1933 else if (!strcasecmp(str, "cpu"))
1934 opts->affinity = PERF_AFFINITY_CPU;
1935
1936 return 0;
1937}
1938
1939static int record__parse_mmap_pages(const struct option *opt,
1940 const char *str,
1941 int unset __maybe_unused)
1942{
1943 struct record_opts *opts = opt->value;
1944 char *s, *p;
1945 unsigned int mmap_pages;
1946 int ret;
1947
1948 if (!str)
1949 return -EINVAL;
1950
1951 s = strdup(str);
1952 if (!s)
1953 return -ENOMEM;
1954
1955 p = strchr(s, ',');
1956 if (p)
1957 *p = '\0';
1958
1959 if (*s) {
1960 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, s);
1961 if (ret)
1962 goto out_free;
1963 opts->mmap_pages = mmap_pages;
1964 }
1965
1966 if (!p) {
1967 ret = 0;
1968 goto out_free;
1969 }
1970
1971 ret = __perf_evlist__parse_mmap_pages(&mmap_pages, p + 1);
1972 if (ret)
1973 goto out_free;
1974
1975 opts->auxtrace_mmap_pages = mmap_pages;
1976
1977out_free:
1978 free(s);
1979 return ret;
1980}
1981
1982static void switch_output_size_warn(struct record *rec)
1983{
1984 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
1985 struct switch_output *s = &rec->switch_output;
1986
1987 wakeup_size /= 2;
1988
1989 if (s->size < wakeup_size) {
1990 char buf[100];
1991
1992 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
1993 pr_warning("WARNING: switch-output data size lower than "
1994 "wakeup kernel buffer size (%s) "
1995 "expect bigger perf.data sizes\n", buf);
1996 }
1997}
1998
1999static int switch_output_setup(struct record *rec)
2000{
2001 struct switch_output *s = &rec->switch_output;
2002 static struct parse_tag tags_size[] = {
2003 { .tag = 'B', .mult = 1 },
2004 { .tag = 'K', .mult = 1 << 10 },
2005 { .tag = 'M', .mult = 1 << 20 },
2006 { .tag = 'G', .mult = 1 << 30 },
2007 { .tag = 0 },
2008 };
2009 static struct parse_tag tags_time[] = {
2010 { .tag = 's', .mult = 1 },
2011 { .tag = 'm', .mult = 60 },
2012 { .tag = 'h', .mult = 60*60 },
2013 { .tag = 'd', .mult = 60*60*24 },
2014 { .tag = 0 },
2015 };
2016 unsigned long val;
2017
2018 if (!s->set)
2019 return 0;
2020
2021 if (!strcmp(s->str, "signal")) {
2022 s->signal = true;
2023 pr_debug("switch-output with SIGUSR2 signal\n");
2024 goto enabled;
2025 }
2026
2027 val = parse_tag_value(s->str, tags_size);
2028 if (val != (unsigned long) -1) {
2029 s->size = val;
2030 pr_debug("switch-output with %s size threshold\n", s->str);
2031 goto enabled;
2032 }
2033
2034 val = parse_tag_value(s->str, tags_time);
2035 if (val != (unsigned long) -1) {
2036 s->time = val;
2037 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2038 s->str, s->time);
2039 goto enabled;
2040 }
2041
2042 return -1;
2043
2044enabled:
2045 rec->timestamp_filename = true;
2046 s->enabled = true;
2047
2048 if (s->size && !rec->opts.no_buffering)
2049 switch_output_size_warn(rec);
2050
2051 return 0;
2052}
2053
2054static const char * const __record_usage[] = {
2055 "perf record [<options>] [<command>]",
2056 "perf record [<options>] -- <command> [<options>]",
2057 NULL
2058};
2059const char * const *record_usage = __record_usage;
2060
2061/*
2062 * XXX Ideally would be local to cmd_record() and passed to a record__new
2063 * because we need to have access to it in record__exit, that is called
2064 * after cmd_record() exits, but since record_options need to be accessible to
2065 * builtin-script, leave it here.
2066 *
2067 * At least we don't ouch it in all the other functions here directly.
2068 *
2069 * Just say no to tons of global variables, sigh.
2070 */
2071static struct record record = {
2072 .opts = {
2073 .sample_time = true,
2074 .mmap_pages = UINT_MAX,
2075 .user_freq = UINT_MAX,
2076 .user_interval = ULLONG_MAX,
2077 .freq = 4000,
2078 .target = {
2079 .uses_mmap = true,
2080 .default_per_cpu = true,
2081 },
2082 .mmap_flush = MMAP_FLUSH_DEFAULT,
2083 },
2084 .tool = {
2085 .sample = process_sample_event,
2086 .fork = perf_event__process_fork,
2087 .exit = perf_event__process_exit,
2088 .comm = perf_event__process_comm,
2089 .namespaces = perf_event__process_namespaces,
2090 .mmap = perf_event__process_mmap,
2091 .mmap2 = perf_event__process_mmap2,
2092 .ordered_events = true,
2093 },
2094};
2095
2096const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2097 "\n\t\t\t\tDefault: fp";
2098
2099static bool dry_run;
2100
2101/*
2102 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
2103 * with it and switch to use the library functions in perf_evlist that came
2104 * from builtin-record.c, i.e. use record_opts,
2105 * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
2106 * using pipes, etc.
2107 */
2108static struct option __record_options[] = {
2109 OPT_CALLBACK('e', "event", &record.evlist, "event",
2110 "event selector. use 'perf list' to list available events",
2111 parse_events_option),
2112 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2113 "event filter", parse_filter),
2114 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2115 NULL, "don't record events from perf itself",
2116 exclude_perf),
2117 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2118 "record events on existing process id"),
2119 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2120 "record events on existing thread id"),
2121 OPT_INTEGER('r', "realtime", &record.realtime_prio,
2122 "collect data with this RT SCHED_FIFO priority"),
2123 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2124 "collect data without buffering"),
2125 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2126 "collect raw sample records from all opened counters"),
2127 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2128 "system-wide collection from all CPUs"),
2129 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2130 "list of cpus to monitor"),
2131 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2132 OPT_STRING('o', "output", &record.data.path, "file",
2133 "output file name"),
2134 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2135 &record.opts.no_inherit_set,
2136 "child tasks do not inherit counters"),
2137 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2138 "synthesize non-sample events at the end of output"),
2139 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2140 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "record bpf events"),
2141 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2142 "Fail if the specified frequency can't be used"),
2143 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2144 "profile at this frequency",
2145 record__parse_freq),
2146 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2147 "number of mmap data pages and AUX area tracing mmap pages",
2148 record__parse_mmap_pages),
2149 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2150 "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2151 record__mmap_flush_parse),
2152 OPT_BOOLEAN(0, "group", &record.opts.group,
2153 "put the counters into a counter group"),
2154 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2155 NULL, "enables call-graph recording" ,
2156 &record_callchain_opt),
2157 OPT_CALLBACK(0, "call-graph", &record.opts,
2158 "record_mode[,record_size]", record_callchain_help,
2159 &record_parse_callchain_opt),
2160 OPT_INCR('v', "verbose", &verbose,
2161 "be more verbose (show counter open errors, etc)"),
2162 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2163 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2164 "per thread counts"),
2165 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2166 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2167 "Record the sample physical addresses"),
2168 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2169 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2170 &record.opts.sample_time_set,
2171 "Record the sample timestamps"),
2172 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2173 "Record the sample period"),
2174 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2175 "don't sample"),
2176 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2177 &record.no_buildid_cache_set,
2178 "do not update the buildid cache"),
2179 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2180 &record.no_buildid_set,
2181 "do not collect buildids in perf.data"),
2182 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2183 "monitor event in cgroup name only",
2184 parse_cgroups),
2185 OPT_UINTEGER('D', "delay", &record.opts.initial_delay,
2186 "ms to wait before starting measurement after program start"),
2187 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2188 "user to profile"),
2189
2190 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2191 "branch any", "sample any taken branches",
2192 parse_branch_stack),
2193
2194 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2195 "branch filter mask", "branch stack filter modes",
2196 parse_branch_stack),
2197 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2198 "sample by weight (on special events only)"),
2199 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2200 "sample transaction flags (special events only)"),
2201 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2202 "use per-thread mmaps"),
2203 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2204 "sample selected machine registers on interrupt,"
2205 " use '-I?' to list register names", parse_intr_regs),
2206 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2207 "sample selected machine registers on interrupt,"
2208 " use '--user-regs=?' to list register names", parse_user_regs),
2209 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2210 "Record running/enabled time of read (:S) events"),
2211 OPT_CALLBACK('k', "clockid", &record.opts,
2212 "clockid", "clockid to use for events, see clock_gettime()",
2213 parse_clockid),
2214 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2215 "opts", "AUX area tracing Snapshot Mode", ""),
2216 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2217 "per thread proc mmap processing timeout in ms"),
2218 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2219 "Record namespaces events"),
2220 OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events,
2221 "Record context switch events"),
2222 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2223 "Configure all used events to run in kernel space.",
2224 PARSE_OPT_EXCLUSIVE),
2225 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2226 "Configure all used events to run in user space.",
2227 PARSE_OPT_EXCLUSIVE),
2228 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2229 "collect kernel callchains"),
2230 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2231 "collect user callchains"),
2232 OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2233 "clang binary to use for compiling BPF scriptlets"),
2234 OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2235 "options passed to clang when compiling BPF scriptlets"),
2236 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2237 "file", "vmlinux pathname"),
2238 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2239 "Record build-id of all DSOs regardless of hits"),
2240 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2241 "append timestamp to output filename"),
2242 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2243 "Record timestamp boundary (time of first/last samples)"),
2244 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2245 &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2246 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2247 "signal"),
2248 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2249 "Limit number of switch output generated files"),
2250 OPT_BOOLEAN(0, "dry-run", &dry_run,
2251 "Parse options then exit"),
2252#ifdef HAVE_AIO_SUPPORT
2253 OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2254 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2255 record__aio_parse),
2256#endif
2257 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2258 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2259 record__parse_affinity),
2260#ifdef HAVE_ZSTD_SUPPORT
2261 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2262 "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2263 record__parse_comp_level),
2264#endif
2265 OPT_END()
2266};
2267
2268struct option *record_options = __record_options;
2269
2270int cmd_record(int argc, const char **argv)
2271{
2272 int err;
2273 struct record *rec = &record;
2274 char errbuf[BUFSIZ];
2275
2276 setlocale(LC_ALL, "");
2277
2278#ifndef HAVE_LIBBPF_SUPPORT
2279# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2280 set_nobuild('\0', "clang-path", true);
2281 set_nobuild('\0', "clang-opt", true);
2282# undef set_nobuild
2283#endif
2284
2285#ifndef HAVE_BPF_PROLOGUE
2286# if !defined (HAVE_DWARF_SUPPORT)
2287# define REASON "NO_DWARF=1"
2288# elif !defined (HAVE_LIBBPF_SUPPORT)
2289# define REASON "NO_LIBBPF=1"
2290# else
2291# define REASON "this architecture doesn't support BPF prologue"
2292# endif
2293# define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2294 set_nobuild('\0', "vmlinux", true);
2295# undef set_nobuild
2296# undef REASON
2297#endif
2298
2299 CPU_ZERO(&rec->affinity_mask);
2300 rec->opts.affinity = PERF_AFFINITY_SYS;
2301
2302 rec->evlist = evlist__new();
2303 if (rec->evlist == NULL)
2304 return -ENOMEM;
2305
2306 err = perf_config(perf_record_config, rec);
2307 if (err)
2308 return err;
2309
2310 argc = parse_options(argc, argv, record_options, record_usage,
2311 PARSE_OPT_STOP_AT_NON_OPTION);
2312 if (quiet)
2313 perf_quiet_option();
2314
2315 /* Make system wide (-a) the default target. */
2316 if (!argc && target__none(&rec->opts.target))
2317 rec->opts.target.system_wide = true;
2318
2319 if (nr_cgroups && !rec->opts.target.system_wide) {
2320 usage_with_options_msg(record_usage, record_options,
2321 "cgroup monitoring only available in system-wide mode");
2322
2323 }
2324
2325 if (rec->opts.comp_level != 0) {
2326 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2327 rec->no_buildid = true;
2328 }
2329
2330 if (rec->opts.record_switch_events &&
2331 !perf_can_record_switch_events()) {
2332 ui__error("kernel does not support recording context switch events\n");
2333 parse_options_usage(record_usage, record_options, "switch-events", 0);
2334 return -EINVAL;
2335 }
2336
2337 if (switch_output_setup(rec)) {
2338 parse_options_usage(record_usage, record_options, "switch-output", 0);
2339 return -EINVAL;
2340 }
2341
2342 if (rec->switch_output.time) {
2343 signal(SIGALRM, alarm_sig_handler);
2344 alarm(rec->switch_output.time);
2345 }
2346
2347 if (rec->switch_output.num_files) {
2348 rec->switch_output.filenames = calloc(sizeof(char *),
2349 rec->switch_output.num_files);
2350 if (!rec->switch_output.filenames)
2351 return -EINVAL;
2352 }
2353
2354 /*
2355 * Allow aliases to facilitate the lookup of symbols for address
2356 * filters. Refer to auxtrace_parse_filters().
2357 */
2358 symbol_conf.allow_aliases = true;
2359
2360 symbol__init(NULL);
2361
2362 err = record__auxtrace_init(rec);
2363 if (err)
2364 goto out;
2365
2366 if (dry_run)
2367 goto out;
2368
2369 err = bpf__setup_stdout(rec->evlist);
2370 if (err) {
2371 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2372 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2373 errbuf);
2374 goto out;
2375 }
2376
2377 err = -ENOMEM;
2378
2379 if (rec->no_buildid_cache || rec->no_buildid) {
2380 disable_buildid_cache();
2381 } else if (rec->switch_output.enabled) {
2382 /*
2383 * In 'perf record --switch-output', disable buildid
2384 * generation by default to reduce data file switching
2385 * overhead. Still generate buildid if they are required
2386 * explicitly using
2387 *
2388 * perf record --switch-output --no-no-buildid \
2389 * --no-no-buildid-cache
2390 *
2391 * Following code equals to:
2392 *
2393 * if ((rec->no_buildid || !rec->no_buildid_set) &&
2394 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
2395 * disable_buildid_cache();
2396 */
2397 bool disable = true;
2398
2399 if (rec->no_buildid_set && !rec->no_buildid)
2400 disable = false;
2401 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2402 disable = false;
2403 if (disable) {
2404 rec->no_buildid = true;
2405 rec->no_buildid_cache = true;
2406 disable_buildid_cache();
2407 }
2408 }
2409
2410 if (record.opts.overwrite)
2411 record.opts.tail_synthesize = true;
2412
2413 if (rec->evlist->core.nr_entries == 0 &&
2414 __perf_evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
2415 pr_err("Not enough memory for event selector list\n");
2416 goto out;
2417 }
2418
2419 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2420 rec->opts.no_inherit = true;
2421
2422 err = target__validate(&rec->opts.target);
2423 if (err) {
2424 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2425 ui__warning("%s\n", errbuf);
2426 }
2427
2428 err = target__parse_uid(&rec->opts.target);
2429 if (err) {
2430 int saved_errno = errno;
2431
2432 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2433 ui__error("%s", errbuf);
2434
2435 err = -saved_errno;
2436 goto out;
2437 }
2438
2439 /* Enable ignoring missing threads when -u/-p option is defined. */
2440 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2441
2442 err = -ENOMEM;
2443 if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2444 usage_with_options(record_usage, record_options);
2445
2446 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2447 if (err)
2448 goto out;
2449
2450 /*
2451 * We take all buildids when the file contains
2452 * AUX area tracing data because we do not decode the
2453 * trace because it would take too long.
2454 */
2455 if (rec->opts.full_auxtrace)
2456 rec->buildid_all = true;
2457
2458 if (record_opts__config(&rec->opts)) {
2459 err = -EINVAL;
2460 goto out;
2461 }
2462
2463 if (rec->opts.nr_cblocks > nr_cblocks_max)
2464 rec->opts.nr_cblocks = nr_cblocks_max;
2465 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2466
2467 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2468 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2469
2470 if (rec->opts.comp_level > comp_level_max)
2471 rec->opts.comp_level = comp_level_max;
2472 pr_debug("comp level: %d\n", rec->opts.comp_level);
2473
2474 err = __cmd_record(&record, argc, argv);
2475out:
2476 evlist__delete(rec->evlist);
2477 symbol__exit();
2478 auxtrace_record__free(rec->itr);
2479 return err;
2480}
2481
2482static void snapshot_sig_handler(int sig __maybe_unused)
2483{
2484 struct record *rec = &record;
2485
2486 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
2487 trigger_hit(&auxtrace_snapshot_trigger);
2488 auxtrace_record__snapshot_started = 1;
2489 if (auxtrace_record__snapshot_start(record.itr))
2490 trigger_error(&auxtrace_snapshot_trigger);
2491 }
2492
2493 if (switch_output_signal(rec))
2494 trigger_hit(&switch_output_trigger);
2495}
2496
2497static void alarm_sig_handler(int sig __maybe_unused)
2498{
2499 struct record *rec = &record;
2500
2501 if (switch_output_time(rec))
2502 trigger_hit(&switch_output_trigger);
2503}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * builtin-record.c
4 *
5 * Builtin record command: Record the profile of a workload
6 * (or a CPU, or a PID) into the perf.data output file - for
7 * later analysis via perf report.
8 */
9#include "builtin.h"
10
11#include "util/build-id.h"
12#include <subcmd/parse-options.h>
13#include <internal/xyarray.h>
14#include "util/parse-events.h"
15#include "util/config.h"
16
17#include "util/callchain.h"
18#include "util/cgroup.h"
19#include "util/header.h"
20#include "util/event.h"
21#include "util/evlist.h"
22#include "util/evsel.h"
23#include "util/debug.h"
24#include "util/mmap.h"
25#include "util/mutex.h"
26#include "util/target.h"
27#include "util/session.h"
28#include "util/tool.h"
29#include "util/symbol.h"
30#include "util/record.h"
31#include "util/cpumap.h"
32#include "util/thread_map.h"
33#include "util/data.h"
34#include "util/perf_regs.h"
35#include "util/auxtrace.h"
36#include "util/tsc.h"
37#include "util/parse-branch-options.h"
38#include "util/parse-regs-options.h"
39#include "util/perf_api_probe.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/pmu.h"
50#include "util/pmus.h"
51#include "util/clockid.h"
52#include "util/off_cpu.h"
53#include "util/bpf-filter.h"
54#include "asm/bug.h"
55#include "perf.h"
56#include "cputopo.h"
57
58#include <errno.h>
59#include <inttypes.h>
60#include <locale.h>
61#include <poll.h>
62#include <pthread.h>
63#include <unistd.h>
64#ifndef HAVE_GETTID
65#include <syscall.h>
66#endif
67#include <sched.h>
68#include <signal.h>
69#ifdef HAVE_EVENTFD_SUPPORT
70#include <sys/eventfd.h>
71#endif
72#include <sys/mman.h>
73#include <sys/wait.h>
74#include <sys/types.h>
75#include <sys/stat.h>
76#include <fcntl.h>
77#include <linux/err.h>
78#include <linux/string.h>
79#include <linux/time64.h>
80#include <linux/zalloc.h>
81#include <linux/bitmap.h>
82#include <sys/time.h>
83
84struct switch_output {
85 bool enabled;
86 bool signal;
87 unsigned long size;
88 unsigned long time;
89 const char *str;
90 bool set;
91 char **filenames;
92 int num_files;
93 int cur_file;
94};
95
96struct thread_mask {
97 struct mmap_cpu_mask maps;
98 struct mmap_cpu_mask affinity;
99};
100
101struct record_thread {
102 pid_t tid;
103 struct thread_mask *mask;
104 struct {
105 int msg[2];
106 int ack[2];
107 } pipes;
108 struct fdarray pollfd;
109 int ctlfd_pos;
110 int nr_mmaps;
111 struct mmap **maps;
112 struct mmap **overwrite_maps;
113 struct record *rec;
114 unsigned long long samples;
115 unsigned long waking;
116 u64 bytes_written;
117 u64 bytes_transferred;
118 u64 bytes_compressed;
119};
120
121static __thread struct record_thread *thread;
122
123enum thread_msg {
124 THREAD_MSG__UNDEFINED = 0,
125 THREAD_MSG__READY,
126 THREAD_MSG__MAX,
127};
128
129static const char *thread_msg_tags[THREAD_MSG__MAX] = {
130 "UNDEFINED", "READY"
131};
132
133enum thread_spec {
134 THREAD_SPEC__UNDEFINED = 0,
135 THREAD_SPEC__CPU,
136 THREAD_SPEC__CORE,
137 THREAD_SPEC__PACKAGE,
138 THREAD_SPEC__NUMA,
139 THREAD_SPEC__USER,
140 THREAD_SPEC__MAX,
141};
142
143static const char *thread_spec_tags[THREAD_SPEC__MAX] = {
144 "undefined", "cpu", "core", "package", "numa", "user"
145};
146
147struct pollfd_index_map {
148 int evlist_pollfd_index;
149 int thread_pollfd_index;
150};
151
152struct record {
153 struct perf_tool tool;
154 struct record_opts opts;
155 u64 bytes_written;
156 u64 thread_bytes_written;
157 struct perf_data data;
158 struct auxtrace_record *itr;
159 struct evlist *evlist;
160 struct perf_session *session;
161 struct evlist *sb_evlist;
162 pthread_t thread_id;
163 int realtime_prio;
164 bool switch_output_event_set;
165 bool no_buildid;
166 bool no_buildid_set;
167 bool no_buildid_cache;
168 bool no_buildid_cache_set;
169 bool buildid_all;
170 bool buildid_mmap;
171 bool timestamp_filename;
172 bool timestamp_boundary;
173 bool off_cpu;
174 struct switch_output switch_output;
175 unsigned long long samples;
176 unsigned long output_max_size; /* = 0: unlimited */
177 struct perf_debuginfod debuginfod;
178 int nr_threads;
179 struct thread_mask *thread_masks;
180 struct record_thread *thread_data;
181 struct pollfd_index_map *index_map;
182 size_t index_map_sz;
183 size_t index_map_cnt;
184};
185
186static volatile int done;
187
188static volatile int auxtrace_record__snapshot_started;
189static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
190static DEFINE_TRIGGER(switch_output_trigger);
191
192static const char *affinity_tags[PERF_AFFINITY_MAX] = {
193 "SYS", "NODE", "CPU"
194};
195
196#ifndef HAVE_GETTID
197static inline pid_t gettid(void)
198{
199 return (pid_t)syscall(__NR_gettid);
200}
201#endif
202
203static int record__threads_enabled(struct record *rec)
204{
205 return rec->opts.threads_spec;
206}
207
208static bool switch_output_signal(struct record *rec)
209{
210 return rec->switch_output.signal &&
211 trigger_is_ready(&switch_output_trigger);
212}
213
214static bool switch_output_size(struct record *rec)
215{
216 return rec->switch_output.size &&
217 trigger_is_ready(&switch_output_trigger) &&
218 (rec->bytes_written >= rec->switch_output.size);
219}
220
221static bool switch_output_time(struct record *rec)
222{
223 return rec->switch_output.time &&
224 trigger_is_ready(&switch_output_trigger);
225}
226
227static u64 record__bytes_written(struct record *rec)
228{
229 return rec->bytes_written + rec->thread_bytes_written;
230}
231
232static bool record__output_max_size_exceeded(struct record *rec)
233{
234 return rec->output_max_size &&
235 (record__bytes_written(rec) >= rec->output_max_size);
236}
237
238static int record__write(struct record *rec, struct mmap *map __maybe_unused,
239 void *bf, size_t size)
240{
241 struct perf_data_file *file = &rec->session->data->file;
242
243 if (map && map->file)
244 file = map->file;
245
246 if (perf_data_file__write(file, bf, size) < 0) {
247 pr_err("failed to write perf data, error: %m\n");
248 return -1;
249 }
250
251 if (map && map->file) {
252 thread->bytes_written += size;
253 rec->thread_bytes_written += size;
254 } else {
255 rec->bytes_written += size;
256 }
257
258 if (record__output_max_size_exceeded(rec) && !done) {
259 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
260 " stopping session ]\n",
261 record__bytes_written(rec) >> 10);
262 done = 1;
263 }
264
265 if (switch_output_size(rec))
266 trigger_hit(&switch_output_trigger);
267
268 return 0;
269}
270
271static int record__aio_enabled(struct record *rec);
272static int record__comp_enabled(struct record *rec);
273static ssize_t zstd_compress(struct perf_session *session, struct mmap *map,
274 void *dst, size_t dst_size, void *src, size_t src_size);
275
276#ifdef HAVE_AIO_SUPPORT
277static int record__aio_write(struct aiocb *cblock, int trace_fd,
278 void *buf, size_t size, off_t off)
279{
280 int rc;
281
282 cblock->aio_fildes = trace_fd;
283 cblock->aio_buf = buf;
284 cblock->aio_nbytes = size;
285 cblock->aio_offset = off;
286 cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
287
288 do {
289 rc = aio_write(cblock);
290 if (rc == 0) {
291 break;
292 } else if (errno != EAGAIN) {
293 cblock->aio_fildes = -1;
294 pr_err("failed to queue perf data, error: %m\n");
295 break;
296 }
297 } while (1);
298
299 return rc;
300}
301
302static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
303{
304 void *rem_buf;
305 off_t rem_off;
306 size_t rem_size;
307 int rc, aio_errno;
308 ssize_t aio_ret, written;
309
310 aio_errno = aio_error(cblock);
311 if (aio_errno == EINPROGRESS)
312 return 0;
313
314 written = aio_ret = aio_return(cblock);
315 if (aio_ret < 0) {
316 if (aio_errno != EINTR)
317 pr_err("failed to write perf data, error: %m\n");
318 written = 0;
319 }
320
321 rem_size = cblock->aio_nbytes - written;
322
323 if (rem_size == 0) {
324 cblock->aio_fildes = -1;
325 /*
326 * md->refcount is incremented in record__aio_pushfn() for
327 * every aio write request started in record__aio_push() so
328 * decrement it because the request is now complete.
329 */
330 perf_mmap__put(&md->core);
331 rc = 1;
332 } else {
333 /*
334 * aio write request may require restart with the
335 * reminder if the kernel didn't write whole
336 * chunk at once.
337 */
338 rem_off = cblock->aio_offset + written;
339 rem_buf = (void *)(cblock->aio_buf + written);
340 record__aio_write(cblock, cblock->aio_fildes,
341 rem_buf, rem_size, rem_off);
342 rc = 0;
343 }
344
345 return rc;
346}
347
348static int record__aio_sync(struct mmap *md, bool sync_all)
349{
350 struct aiocb **aiocb = md->aio.aiocb;
351 struct aiocb *cblocks = md->aio.cblocks;
352 struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */
353 int i, do_suspend;
354
355 do {
356 do_suspend = 0;
357 for (i = 0; i < md->aio.nr_cblocks; ++i) {
358 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
359 if (sync_all)
360 aiocb[i] = NULL;
361 else
362 return i;
363 } else {
364 /*
365 * Started aio write is not complete yet
366 * so it has to be waited before the
367 * next allocation.
368 */
369 aiocb[i] = &cblocks[i];
370 do_suspend = 1;
371 }
372 }
373 if (!do_suspend)
374 return -1;
375
376 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
377 if (!(errno == EAGAIN || errno == EINTR))
378 pr_err("failed to sync perf data, error: %m\n");
379 }
380 } while (1);
381}
382
383struct record_aio {
384 struct record *rec;
385 void *data;
386 size_t size;
387};
388
389static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
390{
391 struct record_aio *aio = to;
392
393 /*
394 * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
395 * to release space in the kernel buffer as fast as possible, calling
396 * perf_mmap__consume() from perf_mmap__push() function.
397 *
398 * That lets the kernel to proceed with storing more profiling data into
399 * the kernel buffer earlier than other per-cpu kernel buffers are handled.
400 *
401 * Coping can be done in two steps in case the chunk of profiling data
402 * crosses the upper bound of the kernel buffer. In this case we first move
403 * part of data from map->start till the upper bound and then the reminder
404 * from the beginning of the kernel buffer till the end of the data chunk.
405 */
406
407 if (record__comp_enabled(aio->rec)) {
408 ssize_t compressed = zstd_compress(aio->rec->session, NULL, aio->data + aio->size,
409 mmap__mmap_len(map) - aio->size,
410 buf, size);
411 if (compressed < 0)
412 return (int)compressed;
413
414 size = compressed;
415 } else {
416 memcpy(aio->data + aio->size, buf, size);
417 }
418
419 if (!aio->size) {
420 /*
421 * Increment map->refcount to guard map->aio.data[] buffer
422 * from premature deallocation because map object can be
423 * released earlier than aio write request started on
424 * map->aio.data[] buffer is complete.
425 *
426 * perf_mmap__put() is done at record__aio_complete()
427 * after started aio request completion or at record__aio_push()
428 * if the request failed to start.
429 */
430 perf_mmap__get(&map->core);
431 }
432
433 aio->size += size;
434
435 return size;
436}
437
438static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
439{
440 int ret, idx;
441 int trace_fd = rec->session->data->file.fd;
442 struct record_aio aio = { .rec = rec, .size = 0 };
443
444 /*
445 * Call record__aio_sync() to wait till map->aio.data[] buffer
446 * becomes available after previous aio write operation.
447 */
448
449 idx = record__aio_sync(map, false);
450 aio.data = map->aio.data[idx];
451 ret = perf_mmap__push(map, &aio, record__aio_pushfn);
452 if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
453 return ret;
454
455 rec->samples++;
456 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
457 if (!ret) {
458 *off += aio.size;
459 rec->bytes_written += aio.size;
460 if (switch_output_size(rec))
461 trigger_hit(&switch_output_trigger);
462 } else {
463 /*
464 * Decrement map->refcount incremented in record__aio_pushfn()
465 * back if record__aio_write() operation failed to start, otherwise
466 * map->refcount is decremented in record__aio_complete() after
467 * aio write operation finishes successfully.
468 */
469 perf_mmap__put(&map->core);
470 }
471
472 return ret;
473}
474
475static off_t record__aio_get_pos(int trace_fd)
476{
477 return lseek(trace_fd, 0, SEEK_CUR);
478}
479
480static void record__aio_set_pos(int trace_fd, off_t pos)
481{
482 lseek(trace_fd, pos, SEEK_SET);
483}
484
485static void record__aio_mmap_read_sync(struct record *rec)
486{
487 int i;
488 struct evlist *evlist = rec->evlist;
489 struct mmap *maps = evlist->mmap;
490
491 if (!record__aio_enabled(rec))
492 return;
493
494 for (i = 0; i < evlist->core.nr_mmaps; i++) {
495 struct mmap *map = &maps[i];
496
497 if (map->core.base)
498 record__aio_sync(map, true);
499 }
500}
501
502static int nr_cblocks_default = 1;
503static int nr_cblocks_max = 4;
504
505static int record__aio_parse(const struct option *opt,
506 const char *str,
507 int unset)
508{
509 struct record_opts *opts = (struct record_opts *)opt->value;
510
511 if (unset) {
512 opts->nr_cblocks = 0;
513 } else {
514 if (str)
515 opts->nr_cblocks = strtol(str, NULL, 0);
516 if (!opts->nr_cblocks)
517 opts->nr_cblocks = nr_cblocks_default;
518 }
519
520 return 0;
521}
522#else /* HAVE_AIO_SUPPORT */
523static int nr_cblocks_max = 0;
524
525static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
526 off_t *off __maybe_unused)
527{
528 return -1;
529}
530
531static off_t record__aio_get_pos(int trace_fd __maybe_unused)
532{
533 return -1;
534}
535
536static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
537{
538}
539
540static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
541{
542}
543#endif
544
545static int record__aio_enabled(struct record *rec)
546{
547 return rec->opts.nr_cblocks > 0;
548}
549
550#define MMAP_FLUSH_DEFAULT 1
551static int record__mmap_flush_parse(const struct option *opt,
552 const char *str,
553 int unset)
554{
555 int flush_max;
556 struct record_opts *opts = (struct record_opts *)opt->value;
557 static struct parse_tag tags[] = {
558 { .tag = 'B', .mult = 1 },
559 { .tag = 'K', .mult = 1 << 10 },
560 { .tag = 'M', .mult = 1 << 20 },
561 { .tag = 'G', .mult = 1 << 30 },
562 { .tag = 0 },
563 };
564
565 if (unset)
566 return 0;
567
568 if (str) {
569 opts->mmap_flush = parse_tag_value(str, tags);
570 if (opts->mmap_flush == (int)-1)
571 opts->mmap_flush = strtol(str, NULL, 0);
572 }
573
574 if (!opts->mmap_flush)
575 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
576
577 flush_max = evlist__mmap_size(opts->mmap_pages);
578 flush_max /= 4;
579 if (opts->mmap_flush > flush_max)
580 opts->mmap_flush = flush_max;
581
582 return 0;
583}
584
585#ifdef HAVE_ZSTD_SUPPORT
586static unsigned int comp_level_default = 1;
587
588static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
589{
590 struct record_opts *opts = opt->value;
591
592 if (unset) {
593 opts->comp_level = 0;
594 } else {
595 if (str)
596 opts->comp_level = strtol(str, NULL, 0);
597 if (!opts->comp_level)
598 opts->comp_level = comp_level_default;
599 }
600
601 return 0;
602}
603#endif
604static unsigned int comp_level_max = 22;
605
606static int record__comp_enabled(struct record *rec)
607{
608 return rec->opts.comp_level > 0;
609}
610
611static int process_synthesized_event(struct perf_tool *tool,
612 union perf_event *event,
613 struct perf_sample *sample __maybe_unused,
614 struct machine *machine __maybe_unused)
615{
616 struct record *rec = container_of(tool, struct record, tool);
617 return record__write(rec, NULL, event, event->header.size);
618}
619
620static struct mutex synth_lock;
621
622static int process_locked_synthesized_event(struct perf_tool *tool,
623 union perf_event *event,
624 struct perf_sample *sample __maybe_unused,
625 struct machine *machine __maybe_unused)
626{
627 int ret;
628
629 mutex_lock(&synth_lock);
630 ret = process_synthesized_event(tool, event, sample, machine);
631 mutex_unlock(&synth_lock);
632 return ret;
633}
634
635static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
636{
637 struct record *rec = to;
638
639 if (record__comp_enabled(rec)) {
640 ssize_t compressed = zstd_compress(rec->session, map, map->data,
641 mmap__mmap_len(map), bf, size);
642
643 if (compressed < 0)
644 return (int)compressed;
645
646 size = compressed;
647 bf = map->data;
648 }
649
650 thread->samples++;
651 return record__write(rec, map, bf, size);
652}
653
654static volatile sig_atomic_t signr = -1;
655static volatile sig_atomic_t child_finished;
656#ifdef HAVE_EVENTFD_SUPPORT
657static volatile sig_atomic_t done_fd = -1;
658#endif
659
660static void sig_handler(int sig)
661{
662 if (sig == SIGCHLD)
663 child_finished = 1;
664 else
665 signr = sig;
666
667 done = 1;
668#ifdef HAVE_EVENTFD_SUPPORT
669 if (done_fd >= 0) {
670 u64 tmp = 1;
671 int orig_errno = errno;
672
673 /*
674 * It is possible for this signal handler to run after done is
675 * checked in the main loop, but before the perf counter fds are
676 * polled. If this happens, the poll() will continue to wait
677 * even though done is set, and will only break out if either
678 * another signal is received, or the counters are ready for
679 * read. To ensure the poll() doesn't sleep when done is set,
680 * use an eventfd (done_fd) to wake up the poll().
681 */
682 if (write(done_fd, &tmp, sizeof(tmp)) < 0)
683 pr_err("failed to signal wakeup fd, error: %m\n");
684
685 errno = orig_errno;
686 }
687#endif // HAVE_EVENTFD_SUPPORT
688}
689
690static void sigsegv_handler(int sig)
691{
692 perf_hooks__recover();
693 sighandler_dump_stack(sig);
694}
695
696static void record__sig_exit(void)
697{
698 if (signr == -1)
699 return;
700
701 signal(signr, SIG_DFL);
702 raise(signr);
703}
704
705#ifdef HAVE_AUXTRACE_SUPPORT
706
707static int record__process_auxtrace(struct perf_tool *tool,
708 struct mmap *map,
709 union perf_event *event, void *data1,
710 size_t len1, void *data2, size_t len2)
711{
712 struct record *rec = container_of(tool, struct record, tool);
713 struct perf_data *data = &rec->data;
714 size_t padding;
715 u8 pad[8] = {0};
716
717 if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
718 off_t file_offset;
719 int fd = perf_data__fd(data);
720 int err;
721
722 file_offset = lseek(fd, 0, SEEK_CUR);
723 if (file_offset == -1)
724 return -1;
725 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
726 event, file_offset);
727 if (err)
728 return err;
729 }
730
731 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
732 padding = (len1 + len2) & 7;
733 if (padding)
734 padding = 8 - padding;
735
736 record__write(rec, map, event, event->header.size);
737 record__write(rec, map, data1, len1);
738 if (len2)
739 record__write(rec, map, data2, len2);
740 record__write(rec, map, &pad, padding);
741
742 return 0;
743}
744
745static int record__auxtrace_mmap_read(struct record *rec,
746 struct mmap *map)
747{
748 int ret;
749
750 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
751 record__process_auxtrace);
752 if (ret < 0)
753 return ret;
754
755 if (ret)
756 rec->samples++;
757
758 return 0;
759}
760
761static int record__auxtrace_mmap_read_snapshot(struct record *rec,
762 struct mmap *map)
763{
764 int ret;
765
766 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
767 record__process_auxtrace,
768 rec->opts.auxtrace_snapshot_size);
769 if (ret < 0)
770 return ret;
771
772 if (ret)
773 rec->samples++;
774
775 return 0;
776}
777
778static int record__auxtrace_read_snapshot_all(struct record *rec)
779{
780 int i;
781 int rc = 0;
782
783 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
784 struct mmap *map = &rec->evlist->mmap[i];
785
786 if (!map->auxtrace_mmap.base)
787 continue;
788
789 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
790 rc = -1;
791 goto out;
792 }
793 }
794out:
795 return rc;
796}
797
798static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
799{
800 pr_debug("Recording AUX area tracing snapshot\n");
801 if (record__auxtrace_read_snapshot_all(rec) < 0) {
802 trigger_error(&auxtrace_snapshot_trigger);
803 } else {
804 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
805 trigger_error(&auxtrace_snapshot_trigger);
806 else
807 trigger_ready(&auxtrace_snapshot_trigger);
808 }
809}
810
811static int record__auxtrace_snapshot_exit(struct record *rec)
812{
813 if (trigger_is_error(&auxtrace_snapshot_trigger))
814 return 0;
815
816 if (!auxtrace_record__snapshot_started &&
817 auxtrace_record__snapshot_start(rec->itr))
818 return -1;
819
820 record__read_auxtrace_snapshot(rec, true);
821 if (trigger_is_error(&auxtrace_snapshot_trigger))
822 return -1;
823
824 return 0;
825}
826
827static int record__auxtrace_init(struct record *rec)
828{
829 int err;
830
831 if ((rec->opts.auxtrace_snapshot_opts || rec->opts.auxtrace_sample_opts)
832 && record__threads_enabled(rec)) {
833 pr_err("AUX area tracing options are not available in parallel streaming mode.\n");
834 return -EINVAL;
835 }
836
837 if (!rec->itr) {
838 rec->itr = auxtrace_record__init(rec->evlist, &err);
839 if (err)
840 return err;
841 }
842
843 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
844 rec->opts.auxtrace_snapshot_opts);
845 if (err)
846 return err;
847
848 err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
849 rec->opts.auxtrace_sample_opts);
850 if (err)
851 return err;
852
853 auxtrace_regroup_aux_output(rec->evlist);
854
855 return auxtrace_parse_filters(rec->evlist);
856}
857
858#else
859
860static inline
861int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
862 struct mmap *map __maybe_unused)
863{
864 return 0;
865}
866
867static inline
868void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
869 bool on_exit __maybe_unused)
870{
871}
872
873static inline
874int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
875{
876 return 0;
877}
878
879static inline
880int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
881{
882 return 0;
883}
884
885static int record__auxtrace_init(struct record *rec __maybe_unused)
886{
887 return 0;
888}
889
890#endif
891
892static int record__config_text_poke(struct evlist *evlist)
893{
894 struct evsel *evsel;
895
896 /* Nothing to do if text poke is already configured */
897 evlist__for_each_entry(evlist, evsel) {
898 if (evsel->core.attr.text_poke)
899 return 0;
900 }
901
902 evsel = evlist__add_dummy_on_all_cpus(evlist);
903 if (!evsel)
904 return -ENOMEM;
905
906 evsel->core.attr.text_poke = 1;
907 evsel->core.attr.ksymbol = 1;
908 evsel->immediate = true;
909 evsel__set_sample_bit(evsel, TIME);
910
911 return 0;
912}
913
914static int record__config_off_cpu(struct record *rec)
915{
916 return off_cpu_prepare(rec->evlist, &rec->opts.target, &rec->opts);
917}
918
919static bool record__tracking_system_wide(struct record *rec)
920{
921 struct evlist *evlist = rec->evlist;
922 struct evsel *evsel;
923
924 /*
925 * If non-dummy evsel exists, system_wide sideband is need to
926 * help parse sample information.
927 * For example, PERF_EVENT_MMAP event to help parse symbol,
928 * and PERF_EVENT_COMM event to help parse task executable name.
929 */
930 evlist__for_each_entry(evlist, evsel) {
931 if (!evsel__is_dummy_event(evsel))
932 return true;
933 }
934
935 return false;
936}
937
938static int record__config_tracking_events(struct record *rec)
939{
940 struct record_opts *opts = &rec->opts;
941 struct evlist *evlist = rec->evlist;
942 bool system_wide = false;
943 struct evsel *evsel;
944
945 /*
946 * For initial_delay, system wide or a hybrid system, we need to add
947 * tracking event so that we can track PERF_RECORD_MMAP to cover the
948 * delay of waiting or event synthesis.
949 */
950 if (opts->target.initial_delay || target__has_cpu(&opts->target) ||
951 perf_pmus__num_core_pmus() > 1) {
952
953 /*
954 * User space tasks can migrate between CPUs, so when tracing
955 * selected CPUs, sideband for all CPUs is still needed.
956 */
957 if (!!opts->target.cpu_list && record__tracking_system_wide(rec))
958 system_wide = true;
959
960 evsel = evlist__findnew_tracking_event(evlist, system_wide);
961 if (!evsel)
962 return -ENOMEM;
963
964 /*
965 * Enable the tracking event when the process is forked for
966 * initial_delay, immediately for system wide.
967 */
968 if (opts->target.initial_delay && !evsel->immediate &&
969 !target__has_cpu(&opts->target))
970 evsel->core.attr.enable_on_exec = 1;
971 else
972 evsel->immediate = 1;
973 }
974
975 return 0;
976}
977
978static bool record__kcore_readable(struct machine *machine)
979{
980 char kcore[PATH_MAX];
981 int fd;
982
983 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
984
985 fd = open(kcore, O_RDONLY);
986 if (fd < 0)
987 return false;
988
989 close(fd);
990
991 return true;
992}
993
994static int record__kcore_copy(struct machine *machine, struct perf_data *data)
995{
996 char from_dir[PATH_MAX];
997 char kcore_dir[PATH_MAX];
998 int ret;
999
1000 snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
1001
1002 ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
1003 if (ret)
1004 return ret;
1005
1006 return kcore_copy(from_dir, kcore_dir);
1007}
1008
1009static void record__thread_data_init_pipes(struct record_thread *thread_data)
1010{
1011 thread_data->pipes.msg[0] = -1;
1012 thread_data->pipes.msg[1] = -1;
1013 thread_data->pipes.ack[0] = -1;
1014 thread_data->pipes.ack[1] = -1;
1015}
1016
1017static int record__thread_data_open_pipes(struct record_thread *thread_data)
1018{
1019 if (pipe(thread_data->pipes.msg))
1020 return -EINVAL;
1021
1022 if (pipe(thread_data->pipes.ack)) {
1023 close(thread_data->pipes.msg[0]);
1024 thread_data->pipes.msg[0] = -1;
1025 close(thread_data->pipes.msg[1]);
1026 thread_data->pipes.msg[1] = -1;
1027 return -EINVAL;
1028 }
1029
1030 pr_debug2("thread_data[%p]: msg=[%d,%d], ack=[%d,%d]\n", thread_data,
1031 thread_data->pipes.msg[0], thread_data->pipes.msg[1],
1032 thread_data->pipes.ack[0], thread_data->pipes.ack[1]);
1033
1034 return 0;
1035}
1036
1037static void record__thread_data_close_pipes(struct record_thread *thread_data)
1038{
1039 if (thread_data->pipes.msg[0] != -1) {
1040 close(thread_data->pipes.msg[0]);
1041 thread_data->pipes.msg[0] = -1;
1042 }
1043 if (thread_data->pipes.msg[1] != -1) {
1044 close(thread_data->pipes.msg[1]);
1045 thread_data->pipes.msg[1] = -1;
1046 }
1047 if (thread_data->pipes.ack[0] != -1) {
1048 close(thread_data->pipes.ack[0]);
1049 thread_data->pipes.ack[0] = -1;
1050 }
1051 if (thread_data->pipes.ack[1] != -1) {
1052 close(thread_data->pipes.ack[1]);
1053 thread_data->pipes.ack[1] = -1;
1054 }
1055}
1056
1057static bool evlist__per_thread(struct evlist *evlist)
1058{
1059 return cpu_map__is_dummy(evlist->core.user_requested_cpus);
1060}
1061
1062static int record__thread_data_init_maps(struct record_thread *thread_data, struct evlist *evlist)
1063{
1064 int m, tm, nr_mmaps = evlist->core.nr_mmaps;
1065 struct mmap *mmap = evlist->mmap;
1066 struct mmap *overwrite_mmap = evlist->overwrite_mmap;
1067 struct perf_cpu_map *cpus = evlist->core.all_cpus;
1068 bool per_thread = evlist__per_thread(evlist);
1069
1070 if (per_thread)
1071 thread_data->nr_mmaps = nr_mmaps;
1072 else
1073 thread_data->nr_mmaps = bitmap_weight(thread_data->mask->maps.bits,
1074 thread_data->mask->maps.nbits);
1075 if (mmap) {
1076 thread_data->maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *));
1077 if (!thread_data->maps)
1078 return -ENOMEM;
1079 }
1080 if (overwrite_mmap) {
1081 thread_data->overwrite_maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *));
1082 if (!thread_data->overwrite_maps) {
1083 zfree(&thread_data->maps);
1084 return -ENOMEM;
1085 }
1086 }
1087 pr_debug2("thread_data[%p]: nr_mmaps=%d, maps=%p, ow_maps=%p\n", thread_data,
1088 thread_data->nr_mmaps, thread_data->maps, thread_data->overwrite_maps);
1089
1090 for (m = 0, tm = 0; m < nr_mmaps && tm < thread_data->nr_mmaps; m++) {
1091 if (per_thread ||
1092 test_bit(perf_cpu_map__cpu(cpus, m).cpu, thread_data->mask->maps.bits)) {
1093 if (thread_data->maps) {
1094 thread_data->maps[tm] = &mmap[m];
1095 pr_debug2("thread_data[%p]: cpu%d: maps[%d] -> mmap[%d]\n",
1096 thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m);
1097 }
1098 if (thread_data->overwrite_maps) {
1099 thread_data->overwrite_maps[tm] = &overwrite_mmap[m];
1100 pr_debug2("thread_data[%p]: cpu%d: ow_maps[%d] -> ow_mmap[%d]\n",
1101 thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m);
1102 }
1103 tm++;
1104 }
1105 }
1106
1107 return 0;
1108}
1109
1110static int record__thread_data_init_pollfd(struct record_thread *thread_data, struct evlist *evlist)
1111{
1112 int f, tm, pos;
1113 struct mmap *map, *overwrite_map;
1114
1115 fdarray__init(&thread_data->pollfd, 64);
1116
1117 for (tm = 0; tm < thread_data->nr_mmaps; tm++) {
1118 map = thread_data->maps ? thread_data->maps[tm] : NULL;
1119 overwrite_map = thread_data->overwrite_maps ?
1120 thread_data->overwrite_maps[tm] : NULL;
1121
1122 for (f = 0; f < evlist->core.pollfd.nr; f++) {
1123 void *ptr = evlist->core.pollfd.priv[f].ptr;
1124
1125 if ((map && ptr == map) || (overwrite_map && ptr == overwrite_map)) {
1126 pos = fdarray__dup_entry_from(&thread_data->pollfd, f,
1127 &evlist->core.pollfd);
1128 if (pos < 0)
1129 return pos;
1130 pr_debug2("thread_data[%p]: pollfd[%d] <- event_fd=%d\n",
1131 thread_data, pos, evlist->core.pollfd.entries[f].fd);
1132 }
1133 }
1134 }
1135
1136 return 0;
1137}
1138
1139static void record__free_thread_data(struct record *rec)
1140{
1141 int t;
1142 struct record_thread *thread_data = rec->thread_data;
1143
1144 if (thread_data == NULL)
1145 return;
1146
1147 for (t = 0; t < rec->nr_threads; t++) {
1148 record__thread_data_close_pipes(&thread_data[t]);
1149 zfree(&thread_data[t].maps);
1150 zfree(&thread_data[t].overwrite_maps);
1151 fdarray__exit(&thread_data[t].pollfd);
1152 }
1153
1154 zfree(&rec->thread_data);
1155}
1156
1157static int record__map_thread_evlist_pollfd_indexes(struct record *rec,
1158 int evlist_pollfd_index,
1159 int thread_pollfd_index)
1160{
1161 size_t x = rec->index_map_cnt;
1162
1163 if (realloc_array_as_needed(rec->index_map, rec->index_map_sz, x, NULL))
1164 return -ENOMEM;
1165 rec->index_map[x].evlist_pollfd_index = evlist_pollfd_index;
1166 rec->index_map[x].thread_pollfd_index = thread_pollfd_index;
1167 rec->index_map_cnt += 1;
1168 return 0;
1169}
1170
1171static int record__update_evlist_pollfd_from_thread(struct record *rec,
1172 struct evlist *evlist,
1173 struct record_thread *thread_data)
1174{
1175 struct pollfd *e_entries = evlist->core.pollfd.entries;
1176 struct pollfd *t_entries = thread_data->pollfd.entries;
1177 int err = 0;
1178 size_t i;
1179
1180 for (i = 0; i < rec->index_map_cnt; i++) {
1181 int e_pos = rec->index_map[i].evlist_pollfd_index;
1182 int t_pos = rec->index_map[i].thread_pollfd_index;
1183
1184 if (e_entries[e_pos].fd != t_entries[t_pos].fd ||
1185 e_entries[e_pos].events != t_entries[t_pos].events) {
1186 pr_err("Thread and evlist pollfd index mismatch\n");
1187 err = -EINVAL;
1188 continue;
1189 }
1190 e_entries[e_pos].revents = t_entries[t_pos].revents;
1191 }
1192 return err;
1193}
1194
1195static int record__dup_non_perf_events(struct record *rec,
1196 struct evlist *evlist,
1197 struct record_thread *thread_data)
1198{
1199 struct fdarray *fda = &evlist->core.pollfd;
1200 int i, ret;
1201
1202 for (i = 0; i < fda->nr; i++) {
1203 if (!(fda->priv[i].flags & fdarray_flag__non_perf_event))
1204 continue;
1205 ret = fdarray__dup_entry_from(&thread_data->pollfd, i, fda);
1206 if (ret < 0) {
1207 pr_err("Failed to duplicate descriptor in main thread pollfd\n");
1208 return ret;
1209 }
1210 pr_debug2("thread_data[%p]: pollfd[%d] <- non_perf_event fd=%d\n",
1211 thread_data, ret, fda->entries[i].fd);
1212 ret = record__map_thread_evlist_pollfd_indexes(rec, i, ret);
1213 if (ret < 0) {
1214 pr_err("Failed to map thread and evlist pollfd indexes\n");
1215 return ret;
1216 }
1217 }
1218 return 0;
1219}
1220
1221static int record__alloc_thread_data(struct record *rec, struct evlist *evlist)
1222{
1223 int t, ret;
1224 struct record_thread *thread_data;
1225
1226 rec->thread_data = zalloc(rec->nr_threads * sizeof(*(rec->thread_data)));
1227 if (!rec->thread_data) {
1228 pr_err("Failed to allocate thread data\n");
1229 return -ENOMEM;
1230 }
1231 thread_data = rec->thread_data;
1232
1233 for (t = 0; t < rec->nr_threads; t++)
1234 record__thread_data_init_pipes(&thread_data[t]);
1235
1236 for (t = 0; t < rec->nr_threads; t++) {
1237 thread_data[t].rec = rec;
1238 thread_data[t].mask = &rec->thread_masks[t];
1239 ret = record__thread_data_init_maps(&thread_data[t], evlist);
1240 if (ret) {
1241 pr_err("Failed to initialize thread[%d] maps\n", t);
1242 goto out_free;
1243 }
1244 ret = record__thread_data_init_pollfd(&thread_data[t], evlist);
1245 if (ret) {
1246 pr_err("Failed to initialize thread[%d] pollfd\n", t);
1247 goto out_free;
1248 }
1249 if (t) {
1250 thread_data[t].tid = -1;
1251 ret = record__thread_data_open_pipes(&thread_data[t]);
1252 if (ret) {
1253 pr_err("Failed to open thread[%d] communication pipes\n", t);
1254 goto out_free;
1255 }
1256 ret = fdarray__add(&thread_data[t].pollfd, thread_data[t].pipes.msg[0],
1257 POLLIN | POLLERR | POLLHUP, fdarray_flag__nonfilterable);
1258 if (ret < 0) {
1259 pr_err("Failed to add descriptor to thread[%d] pollfd\n", t);
1260 goto out_free;
1261 }
1262 thread_data[t].ctlfd_pos = ret;
1263 pr_debug2("thread_data[%p]: pollfd[%d] <- ctl_fd=%d\n",
1264 thread_data, thread_data[t].ctlfd_pos,
1265 thread_data[t].pipes.msg[0]);
1266 } else {
1267 thread_data[t].tid = gettid();
1268
1269 ret = record__dup_non_perf_events(rec, evlist, &thread_data[t]);
1270 if (ret < 0)
1271 goto out_free;
1272
1273 thread_data[t].ctlfd_pos = -1; /* Not used */
1274 }
1275 }
1276
1277 return 0;
1278
1279out_free:
1280 record__free_thread_data(rec);
1281
1282 return ret;
1283}
1284
1285static int record__mmap_evlist(struct record *rec,
1286 struct evlist *evlist)
1287{
1288 int i, ret;
1289 struct record_opts *opts = &rec->opts;
1290 bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
1291 opts->auxtrace_sample_mode;
1292 char msg[512];
1293
1294 if (opts->affinity != PERF_AFFINITY_SYS)
1295 cpu__setup_cpunode_map();
1296
1297 if (evlist__mmap_ex(evlist, opts->mmap_pages,
1298 opts->auxtrace_mmap_pages,
1299 auxtrace_overwrite,
1300 opts->nr_cblocks, opts->affinity,
1301 opts->mmap_flush, opts->comp_level) < 0) {
1302 if (errno == EPERM) {
1303 pr_err("Permission error mapping pages.\n"
1304 "Consider increasing "
1305 "/proc/sys/kernel/perf_event_mlock_kb,\n"
1306 "or try again with a smaller value of -m/--mmap_pages.\n"
1307 "(current value: %u,%u)\n",
1308 opts->mmap_pages, opts->auxtrace_mmap_pages);
1309 return -errno;
1310 } else {
1311 pr_err("failed to mmap with %d (%s)\n", errno,
1312 str_error_r(errno, msg, sizeof(msg)));
1313 if (errno)
1314 return -errno;
1315 else
1316 return -EINVAL;
1317 }
1318 }
1319
1320 if (evlist__initialize_ctlfd(evlist, opts->ctl_fd, opts->ctl_fd_ack))
1321 return -1;
1322
1323 ret = record__alloc_thread_data(rec, evlist);
1324 if (ret)
1325 return ret;
1326
1327 if (record__threads_enabled(rec)) {
1328 ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
1329 if (ret) {
1330 pr_err("Failed to create data directory: %s\n", strerror(-ret));
1331 return ret;
1332 }
1333 for (i = 0; i < evlist->core.nr_mmaps; i++) {
1334 if (evlist->mmap)
1335 evlist->mmap[i].file = &rec->data.dir.files[i];
1336 if (evlist->overwrite_mmap)
1337 evlist->overwrite_mmap[i].file = &rec->data.dir.files[i];
1338 }
1339 }
1340
1341 return 0;
1342}
1343
1344static int record__mmap(struct record *rec)
1345{
1346 return record__mmap_evlist(rec, rec->evlist);
1347}
1348
1349static int record__open(struct record *rec)
1350{
1351 char msg[BUFSIZ];
1352 struct evsel *pos;
1353 struct evlist *evlist = rec->evlist;
1354 struct perf_session *session = rec->session;
1355 struct record_opts *opts = &rec->opts;
1356 int rc = 0;
1357
1358 evlist__config(evlist, opts, &callchain_param);
1359
1360 evlist__for_each_entry(evlist, pos) {
1361try_again:
1362 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
1363 if (evsel__fallback(pos, &opts->target, errno, msg, sizeof(msg))) {
1364 if (verbose > 0)
1365 ui__warning("%s\n", msg);
1366 goto try_again;
1367 }
1368 if ((errno == EINVAL || errno == EBADF) &&
1369 pos->core.leader != &pos->core &&
1370 pos->weak_group) {
1371 pos = evlist__reset_weak_group(evlist, pos, true);
1372 goto try_again;
1373 }
1374 rc = -errno;
1375 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
1376 ui__error("%s\n", msg);
1377 goto out;
1378 }
1379
1380 pos->supported = true;
1381 }
1382
1383 if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
1384 pr_warning(
1385"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
1386"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
1387"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
1388"file is not found in the buildid cache or in the vmlinux path.\n\n"
1389"Samples in kernel modules won't be resolved at all.\n\n"
1390"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1391"even with a suitable vmlinux or kallsyms file.\n\n");
1392 }
1393
1394 if (evlist__apply_filters(evlist, &pos)) {
1395 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
1396 pos->filter ?: "BPF", evsel__name(pos), errno,
1397 str_error_r(errno, msg, sizeof(msg)));
1398 rc = -1;
1399 goto out;
1400 }
1401
1402 rc = record__mmap(rec);
1403 if (rc)
1404 goto out;
1405
1406 session->evlist = evlist;
1407 perf_session__set_id_hdr_size(session);
1408out:
1409 return rc;
1410}
1411
1412static void set_timestamp_boundary(struct record *rec, u64 sample_time)
1413{
1414 if (rec->evlist->first_sample_time == 0)
1415 rec->evlist->first_sample_time = sample_time;
1416
1417 if (sample_time)
1418 rec->evlist->last_sample_time = sample_time;
1419}
1420
1421static int process_sample_event(struct perf_tool *tool,
1422 union perf_event *event,
1423 struct perf_sample *sample,
1424 struct evsel *evsel,
1425 struct machine *machine)
1426{
1427 struct record *rec = container_of(tool, struct record, tool);
1428
1429 set_timestamp_boundary(rec, sample->time);
1430
1431 if (rec->buildid_all)
1432 return 0;
1433
1434 rec->samples++;
1435 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
1436}
1437
1438static int process_buildids(struct record *rec)
1439{
1440 struct perf_session *session = rec->session;
1441
1442 if (perf_data__size(&rec->data) == 0)
1443 return 0;
1444
1445 /*
1446 * During this process, it'll load kernel map and replace the
1447 * dso->long_name to a real pathname it found. In this case
1448 * we prefer the vmlinux path like
1449 * /lib/modules/3.16.4/build/vmlinux
1450 *
1451 * rather than build-id path (in debug directory).
1452 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1453 */
1454 symbol_conf.ignore_vmlinux_buildid = true;
1455
1456 /*
1457 * If --buildid-all is given, it marks all DSO regardless of hits,
1458 * so no need to process samples. But if timestamp_boundary is enabled,
1459 * it still needs to walk on all samples to get the timestamps of
1460 * first/last samples.
1461 */
1462 if (rec->buildid_all && !rec->timestamp_boundary)
1463 rec->tool.sample = NULL;
1464
1465 return perf_session__process_events(session);
1466}
1467
1468static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1469{
1470 int err;
1471 struct perf_tool *tool = data;
1472 /*
1473 *As for guest kernel when processing subcommand record&report,
1474 *we arrange module mmap prior to guest kernel mmap and trigger
1475 *a preload dso because default guest module symbols are loaded
1476 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1477 *method is used to avoid symbol missing when the first addr is
1478 *in module instead of in guest kernel.
1479 */
1480 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1481 machine);
1482 if (err < 0)
1483 pr_err("Couldn't record guest kernel [%d]'s reference"
1484 " relocation symbol.\n", machine->pid);
1485
1486 /*
1487 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1488 * have no _text sometimes.
1489 */
1490 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1491 machine);
1492 if (err < 0)
1493 pr_err("Couldn't record guest kernel [%d]'s reference"
1494 " relocation symbol.\n", machine->pid);
1495}
1496
1497static struct perf_event_header finished_round_event = {
1498 .size = sizeof(struct perf_event_header),
1499 .type = PERF_RECORD_FINISHED_ROUND,
1500};
1501
1502static struct perf_event_header finished_init_event = {
1503 .size = sizeof(struct perf_event_header),
1504 .type = PERF_RECORD_FINISHED_INIT,
1505};
1506
1507static void record__adjust_affinity(struct record *rec, struct mmap *map)
1508{
1509 if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1510 !bitmap_equal(thread->mask->affinity.bits, map->affinity_mask.bits,
1511 thread->mask->affinity.nbits)) {
1512 bitmap_zero(thread->mask->affinity.bits, thread->mask->affinity.nbits);
1513 bitmap_or(thread->mask->affinity.bits, thread->mask->affinity.bits,
1514 map->affinity_mask.bits, thread->mask->affinity.nbits);
1515 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity),
1516 (cpu_set_t *)thread->mask->affinity.bits);
1517 if (verbose == 2) {
1518 pr_debug("threads[%d]: running on cpu%d: ", thread->tid, sched_getcpu());
1519 mmap_cpu_mask__scnprintf(&thread->mask->affinity, "affinity");
1520 }
1521 }
1522}
1523
1524static size_t process_comp_header(void *record, size_t increment)
1525{
1526 struct perf_record_compressed *event = record;
1527 size_t size = sizeof(*event);
1528
1529 if (increment) {
1530 event->header.size += increment;
1531 return increment;
1532 }
1533
1534 event->header.type = PERF_RECORD_COMPRESSED;
1535 event->header.size = size;
1536
1537 return size;
1538}
1539
1540static ssize_t zstd_compress(struct perf_session *session, struct mmap *map,
1541 void *dst, size_t dst_size, void *src, size_t src_size)
1542{
1543 ssize_t compressed;
1544 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1545 struct zstd_data *zstd_data = &session->zstd_data;
1546
1547 if (map && map->file)
1548 zstd_data = &map->zstd_data;
1549
1550 compressed = zstd_compress_stream_to_records(zstd_data, dst, dst_size, src, src_size,
1551 max_record_size, process_comp_header);
1552 if (compressed < 0)
1553 return compressed;
1554
1555 if (map && map->file) {
1556 thread->bytes_transferred += src_size;
1557 thread->bytes_compressed += compressed;
1558 } else {
1559 session->bytes_transferred += src_size;
1560 session->bytes_compressed += compressed;
1561 }
1562
1563 return compressed;
1564}
1565
1566static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1567 bool overwrite, bool synch)
1568{
1569 u64 bytes_written = rec->bytes_written;
1570 int i;
1571 int rc = 0;
1572 int nr_mmaps;
1573 struct mmap **maps;
1574 int trace_fd = rec->data.file.fd;
1575 off_t off = 0;
1576
1577 if (!evlist)
1578 return 0;
1579
1580 nr_mmaps = thread->nr_mmaps;
1581 maps = overwrite ? thread->overwrite_maps : thread->maps;
1582
1583 if (!maps)
1584 return 0;
1585
1586 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1587 return 0;
1588
1589 if (record__aio_enabled(rec))
1590 off = record__aio_get_pos(trace_fd);
1591
1592 for (i = 0; i < nr_mmaps; i++) {
1593 u64 flush = 0;
1594 struct mmap *map = maps[i];
1595
1596 if (map->core.base) {
1597 record__adjust_affinity(rec, map);
1598 if (synch) {
1599 flush = map->core.flush;
1600 map->core.flush = 1;
1601 }
1602 if (!record__aio_enabled(rec)) {
1603 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1604 if (synch)
1605 map->core.flush = flush;
1606 rc = -1;
1607 goto out;
1608 }
1609 } else {
1610 if (record__aio_push(rec, map, &off) < 0) {
1611 record__aio_set_pos(trace_fd, off);
1612 if (synch)
1613 map->core.flush = flush;
1614 rc = -1;
1615 goto out;
1616 }
1617 }
1618 if (synch)
1619 map->core.flush = flush;
1620 }
1621
1622 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1623 !rec->opts.auxtrace_sample_mode &&
1624 record__auxtrace_mmap_read(rec, map) != 0) {
1625 rc = -1;
1626 goto out;
1627 }
1628 }
1629
1630 if (record__aio_enabled(rec))
1631 record__aio_set_pos(trace_fd, off);
1632
1633 /*
1634 * Mark the round finished in case we wrote
1635 * at least one event.
1636 *
1637 * No need for round events in directory mode,
1638 * because per-cpu maps and files have data
1639 * sorted by kernel.
1640 */
1641 if (!record__threads_enabled(rec) && bytes_written != rec->bytes_written)
1642 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1643
1644 if (overwrite)
1645 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1646out:
1647 return rc;
1648}
1649
1650static int record__mmap_read_all(struct record *rec, bool synch)
1651{
1652 int err;
1653
1654 err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1655 if (err)
1656 return err;
1657
1658 return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1659}
1660
1661static void record__thread_munmap_filtered(struct fdarray *fda, int fd,
1662 void *arg __maybe_unused)
1663{
1664 struct perf_mmap *map = fda->priv[fd].ptr;
1665
1666 if (map)
1667 perf_mmap__put(map);
1668}
1669
1670static void *record__thread(void *arg)
1671{
1672 enum thread_msg msg = THREAD_MSG__READY;
1673 bool terminate = false;
1674 struct fdarray *pollfd;
1675 int err, ctlfd_pos;
1676
1677 thread = arg;
1678 thread->tid = gettid();
1679
1680 err = write(thread->pipes.ack[1], &msg, sizeof(msg));
1681 if (err == -1)
1682 pr_warning("threads[%d]: failed to notify on start: %s\n",
1683 thread->tid, strerror(errno));
1684
1685 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
1686
1687 pollfd = &thread->pollfd;
1688 ctlfd_pos = thread->ctlfd_pos;
1689
1690 for (;;) {
1691 unsigned long long hits = thread->samples;
1692
1693 if (record__mmap_read_all(thread->rec, false) < 0 || terminate)
1694 break;
1695
1696 if (hits == thread->samples) {
1697
1698 err = fdarray__poll(pollfd, -1);
1699 /*
1700 * Propagate error, only if there's any. Ignore positive
1701 * number of returned events and interrupt error.
1702 */
1703 if (err > 0 || (err < 0 && errno == EINTR))
1704 err = 0;
1705 thread->waking++;
1706
1707 if (fdarray__filter(pollfd, POLLERR | POLLHUP,
1708 record__thread_munmap_filtered, NULL) == 0)
1709 break;
1710 }
1711
1712 if (pollfd->entries[ctlfd_pos].revents & POLLHUP) {
1713 terminate = true;
1714 close(thread->pipes.msg[0]);
1715 thread->pipes.msg[0] = -1;
1716 pollfd->entries[ctlfd_pos].fd = -1;
1717 pollfd->entries[ctlfd_pos].events = 0;
1718 }
1719
1720 pollfd->entries[ctlfd_pos].revents = 0;
1721 }
1722 record__mmap_read_all(thread->rec, true);
1723
1724 err = write(thread->pipes.ack[1], &msg, sizeof(msg));
1725 if (err == -1)
1726 pr_warning("threads[%d]: failed to notify on termination: %s\n",
1727 thread->tid, strerror(errno));
1728
1729 return NULL;
1730}
1731
1732static void record__init_features(struct record *rec)
1733{
1734 struct perf_session *session = rec->session;
1735 int feat;
1736
1737 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1738 perf_header__set_feat(&session->header, feat);
1739
1740 if (rec->no_buildid)
1741 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1742
1743#ifdef HAVE_LIBTRACEEVENT
1744 if (!have_tracepoints(&rec->evlist->core.entries))
1745 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1746#endif
1747
1748 if (!rec->opts.branch_stack)
1749 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1750
1751 if (!rec->opts.full_auxtrace)
1752 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1753
1754 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1755 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1756
1757 if (!rec->opts.use_clockid)
1758 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1759
1760 if (!record__threads_enabled(rec))
1761 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1762
1763 if (!record__comp_enabled(rec))
1764 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1765
1766 perf_header__clear_feat(&session->header, HEADER_STAT);
1767}
1768
1769static void
1770record__finish_output(struct record *rec)
1771{
1772 int i;
1773 struct perf_data *data = &rec->data;
1774 int fd = perf_data__fd(data);
1775
1776 if (data->is_pipe)
1777 return;
1778
1779 rec->session->header.data_size += rec->bytes_written;
1780 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1781 if (record__threads_enabled(rec)) {
1782 for (i = 0; i < data->dir.nr; i++)
1783 data->dir.files[i].size = lseek(data->dir.files[i].fd, 0, SEEK_CUR);
1784 }
1785
1786 if (!rec->no_buildid) {
1787 process_buildids(rec);
1788
1789 if (rec->buildid_all)
1790 dsos__hit_all(rec->session);
1791 }
1792 perf_session__write_header(rec->session, rec->evlist, fd, true);
1793
1794 return;
1795}
1796
1797static int record__synthesize_workload(struct record *rec, bool tail)
1798{
1799 int err;
1800 struct perf_thread_map *thread_map;
1801 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP;
1802
1803 if (rec->opts.tail_synthesize != tail)
1804 return 0;
1805
1806 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1807 if (thread_map == NULL)
1808 return -1;
1809
1810 err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1811 process_synthesized_event,
1812 &rec->session->machines.host,
1813 needs_mmap,
1814 rec->opts.sample_address);
1815 perf_thread_map__put(thread_map);
1816 return err;
1817}
1818
1819static int write_finished_init(struct record *rec, bool tail)
1820{
1821 if (rec->opts.tail_synthesize != tail)
1822 return 0;
1823
1824 return record__write(rec, NULL, &finished_init_event, sizeof(finished_init_event));
1825}
1826
1827static int record__synthesize(struct record *rec, bool tail);
1828
1829static int
1830record__switch_output(struct record *rec, bool at_exit)
1831{
1832 struct perf_data *data = &rec->data;
1833 int fd, err;
1834 char *new_filename;
1835
1836 /* Same Size: "2015122520103046"*/
1837 char timestamp[] = "InvalidTimestamp";
1838
1839 record__aio_mmap_read_sync(rec);
1840
1841 write_finished_init(rec, true);
1842
1843 record__synthesize(rec, true);
1844 if (target__none(&rec->opts.target))
1845 record__synthesize_workload(rec, true);
1846
1847 rec->samples = 0;
1848 record__finish_output(rec);
1849 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1850 if (err) {
1851 pr_err("Failed to get current timestamp\n");
1852 return -EINVAL;
1853 }
1854
1855 fd = perf_data__switch(data, timestamp,
1856 rec->session->header.data_offset,
1857 at_exit, &new_filename);
1858 if (fd >= 0 && !at_exit) {
1859 rec->bytes_written = 0;
1860 rec->session->header.data_size = 0;
1861 }
1862
1863 if (!quiet)
1864 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1865 data->path, timestamp);
1866
1867 if (rec->switch_output.num_files) {
1868 int n = rec->switch_output.cur_file + 1;
1869
1870 if (n >= rec->switch_output.num_files)
1871 n = 0;
1872 rec->switch_output.cur_file = n;
1873 if (rec->switch_output.filenames[n]) {
1874 remove(rec->switch_output.filenames[n]);
1875 zfree(&rec->switch_output.filenames[n]);
1876 }
1877 rec->switch_output.filenames[n] = new_filename;
1878 } else {
1879 free(new_filename);
1880 }
1881
1882 /* Output tracking events */
1883 if (!at_exit) {
1884 record__synthesize(rec, false);
1885
1886 /*
1887 * In 'perf record --switch-output' without -a,
1888 * record__synthesize() in record__switch_output() won't
1889 * generate tracking events because there's no thread_map
1890 * in evlist. Which causes newly created perf.data doesn't
1891 * contain map and comm information.
1892 * Create a fake thread_map and directly call
1893 * perf_event__synthesize_thread_map() for those events.
1894 */
1895 if (target__none(&rec->opts.target))
1896 record__synthesize_workload(rec, false);
1897 write_finished_init(rec, false);
1898 }
1899 return fd;
1900}
1901
1902static void __record__save_lost_samples(struct record *rec, struct evsel *evsel,
1903 struct perf_record_lost_samples *lost,
1904 int cpu_idx, int thread_idx, u64 lost_count,
1905 u16 misc_flag)
1906{
1907 struct perf_sample_id *sid;
1908 struct perf_sample sample = {};
1909 int id_hdr_size;
1910
1911 lost->lost = lost_count;
1912 if (evsel->core.ids) {
1913 sid = xyarray__entry(evsel->core.sample_id, cpu_idx, thread_idx);
1914 sample.id = sid->id;
1915 }
1916
1917 id_hdr_size = perf_event__synthesize_id_sample((void *)(lost + 1),
1918 evsel->core.attr.sample_type, &sample);
1919 lost->header.size = sizeof(*lost) + id_hdr_size;
1920 lost->header.misc = misc_flag;
1921 record__write(rec, NULL, lost, lost->header.size);
1922}
1923
1924static void record__read_lost_samples(struct record *rec)
1925{
1926 struct perf_session *session = rec->session;
1927 struct perf_record_lost_samples *lost = NULL;
1928 struct evsel *evsel;
1929
1930 /* there was an error during record__open */
1931 if (session->evlist == NULL)
1932 return;
1933
1934 evlist__for_each_entry(session->evlist, evsel) {
1935 struct xyarray *xy = evsel->core.sample_id;
1936 u64 lost_count;
1937
1938 if (xy == NULL || evsel->core.fd == NULL)
1939 continue;
1940 if (xyarray__max_x(evsel->core.fd) != xyarray__max_x(xy) ||
1941 xyarray__max_y(evsel->core.fd) != xyarray__max_y(xy)) {
1942 pr_debug("Unmatched FD vs. sample ID: skip reading LOST count\n");
1943 continue;
1944 }
1945
1946 for (int x = 0; x < xyarray__max_x(xy); x++) {
1947 for (int y = 0; y < xyarray__max_y(xy); y++) {
1948 struct perf_counts_values count;
1949
1950 if (perf_evsel__read(&evsel->core, x, y, &count) < 0) {
1951 pr_debug("read LOST count failed\n");
1952 goto out;
1953 }
1954
1955 if (count.lost) {
1956 if (!lost) {
1957 lost = zalloc(sizeof(*lost) +
1958 session->machines.host.id_hdr_size);
1959 if (!lost) {
1960 pr_debug("Memory allocation failed\n");
1961 return;
1962 }
1963 lost->header.type = PERF_RECORD_LOST_SAMPLES;
1964 }
1965 __record__save_lost_samples(rec, evsel, lost,
1966 x, y, count.lost, 0);
1967 }
1968 }
1969 }
1970
1971 lost_count = perf_bpf_filter__lost_count(evsel);
1972 if (lost_count) {
1973 if (!lost) {
1974 lost = zalloc(sizeof(*lost) +
1975 session->machines.host.id_hdr_size);
1976 if (!lost) {
1977 pr_debug("Memory allocation failed\n");
1978 return;
1979 }
1980 lost->header.type = PERF_RECORD_LOST_SAMPLES;
1981 }
1982 __record__save_lost_samples(rec, evsel, lost, 0, 0, lost_count,
1983 PERF_RECORD_MISC_LOST_SAMPLES_BPF);
1984 }
1985 }
1986out:
1987 free(lost);
1988}
1989
1990static volatile sig_atomic_t workload_exec_errno;
1991
1992/*
1993 * evlist__prepare_workload will send a SIGUSR1
1994 * if the fork fails, since we asked by setting its
1995 * want_signal to true.
1996 */
1997static void workload_exec_failed_signal(int signo __maybe_unused,
1998 siginfo_t *info,
1999 void *ucontext __maybe_unused)
2000{
2001 workload_exec_errno = info->si_value.sival_int;
2002 done = 1;
2003 child_finished = 1;
2004}
2005
2006static void snapshot_sig_handler(int sig);
2007static void alarm_sig_handler(int sig);
2008
2009static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist)
2010{
2011 if (evlist) {
2012 if (evlist->mmap && evlist->mmap[0].core.base)
2013 return evlist->mmap[0].core.base;
2014 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
2015 return evlist->overwrite_mmap[0].core.base;
2016 }
2017 return NULL;
2018}
2019
2020static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
2021{
2022 const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist);
2023 if (pc)
2024 return pc;
2025 return NULL;
2026}
2027
2028static int record__synthesize(struct record *rec, bool tail)
2029{
2030 struct perf_session *session = rec->session;
2031 struct machine *machine = &session->machines.host;
2032 struct perf_data *data = &rec->data;
2033 struct record_opts *opts = &rec->opts;
2034 struct perf_tool *tool = &rec->tool;
2035 int err = 0;
2036 event_op f = process_synthesized_event;
2037
2038 if (rec->opts.tail_synthesize != tail)
2039 return 0;
2040
2041 if (data->is_pipe) {
2042 err = perf_event__synthesize_for_pipe(tool, session, data,
2043 process_synthesized_event);
2044 if (err < 0)
2045 goto out;
2046
2047 rec->bytes_written += err;
2048 }
2049
2050 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
2051 process_synthesized_event, machine);
2052 if (err)
2053 goto out;
2054
2055 /* Synthesize id_index before auxtrace_info */
2056 err = perf_event__synthesize_id_index(tool,
2057 process_synthesized_event,
2058 session->evlist, machine);
2059 if (err)
2060 goto out;
2061
2062 if (rec->opts.full_auxtrace) {
2063 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
2064 session, process_synthesized_event);
2065 if (err)
2066 goto out;
2067 }
2068
2069 if (!evlist__exclude_kernel(rec->evlist)) {
2070 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
2071 machine);
2072 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
2073 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
2074 "Check /proc/kallsyms permission or run as root.\n");
2075
2076 err = perf_event__synthesize_modules(tool, process_synthesized_event,
2077 machine);
2078 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
2079 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
2080 "Check /proc/modules permission or run as root.\n");
2081 }
2082
2083 if (perf_guest) {
2084 machines__process_guests(&session->machines,
2085 perf_event__synthesize_guest_os, tool);
2086 }
2087
2088 err = perf_event__synthesize_extra_attr(&rec->tool,
2089 rec->evlist,
2090 process_synthesized_event,
2091 data->is_pipe);
2092 if (err)
2093 goto out;
2094
2095 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
2096 process_synthesized_event,
2097 NULL);
2098 if (err < 0) {
2099 pr_err("Couldn't synthesize thread map.\n");
2100 return err;
2101 }
2102
2103 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.all_cpus,
2104 process_synthesized_event, NULL);
2105 if (err < 0) {
2106 pr_err("Couldn't synthesize cpu map.\n");
2107 return err;
2108 }
2109
2110 err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
2111 machine, opts);
2112 if (err < 0) {
2113 pr_warning("Couldn't synthesize bpf events.\n");
2114 err = 0;
2115 }
2116
2117 if (rec->opts.synth & PERF_SYNTH_CGROUP) {
2118 err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
2119 machine);
2120 if (err < 0) {
2121 pr_warning("Couldn't synthesize cgroup events.\n");
2122 err = 0;
2123 }
2124 }
2125
2126 if (rec->opts.nr_threads_synthesize > 1) {
2127 mutex_init(&synth_lock);
2128 perf_set_multithreaded();
2129 f = process_locked_synthesized_event;
2130 }
2131
2132 if (rec->opts.synth & PERF_SYNTH_TASK) {
2133 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP;
2134
2135 err = __machine__synthesize_threads(machine, tool, &opts->target,
2136 rec->evlist->core.threads,
2137 f, needs_mmap, opts->sample_address,
2138 rec->opts.nr_threads_synthesize);
2139 }
2140
2141 if (rec->opts.nr_threads_synthesize > 1) {
2142 perf_set_singlethreaded();
2143 mutex_destroy(&synth_lock);
2144 }
2145
2146out:
2147 return err;
2148}
2149
2150static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
2151{
2152 struct record *rec = data;
2153 pthread_kill(rec->thread_id, SIGUSR2);
2154 return 0;
2155}
2156
2157static int record__setup_sb_evlist(struct record *rec)
2158{
2159 struct record_opts *opts = &rec->opts;
2160
2161 if (rec->sb_evlist != NULL) {
2162 /*
2163 * We get here if --switch-output-event populated the
2164 * sb_evlist, so associate a callback that will send a SIGUSR2
2165 * to the main thread.
2166 */
2167 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
2168 rec->thread_id = pthread_self();
2169 }
2170#ifdef HAVE_LIBBPF_SUPPORT
2171 if (!opts->no_bpf_event) {
2172 if (rec->sb_evlist == NULL) {
2173 rec->sb_evlist = evlist__new();
2174
2175 if (rec->sb_evlist == NULL) {
2176 pr_err("Couldn't create side band evlist.\n.");
2177 return -1;
2178 }
2179 }
2180
2181 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
2182 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
2183 return -1;
2184 }
2185 }
2186#endif
2187 if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
2188 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
2189 opts->no_bpf_event = true;
2190 }
2191
2192 return 0;
2193}
2194
2195static int record__init_clock(struct record *rec)
2196{
2197 struct perf_session *session = rec->session;
2198 struct timespec ref_clockid;
2199 struct timeval ref_tod;
2200 u64 ref;
2201
2202 if (!rec->opts.use_clockid)
2203 return 0;
2204
2205 if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
2206 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
2207
2208 session->header.env.clock.clockid = rec->opts.clockid;
2209
2210 if (gettimeofday(&ref_tod, NULL) != 0) {
2211 pr_err("gettimeofday failed, cannot set reference time.\n");
2212 return -1;
2213 }
2214
2215 if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
2216 pr_err("clock_gettime failed, cannot set reference time.\n");
2217 return -1;
2218 }
2219
2220 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
2221 (u64) ref_tod.tv_usec * NSEC_PER_USEC;
2222
2223 session->header.env.clock.tod_ns = ref;
2224
2225 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
2226 (u64) ref_clockid.tv_nsec;
2227
2228 session->header.env.clock.clockid_ns = ref;
2229 return 0;
2230}
2231
2232static void hit_auxtrace_snapshot_trigger(struct record *rec)
2233{
2234 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
2235 trigger_hit(&auxtrace_snapshot_trigger);
2236 auxtrace_record__snapshot_started = 1;
2237 if (auxtrace_record__snapshot_start(rec->itr))
2238 trigger_error(&auxtrace_snapshot_trigger);
2239 }
2240}
2241
2242static int record__terminate_thread(struct record_thread *thread_data)
2243{
2244 int err;
2245 enum thread_msg ack = THREAD_MSG__UNDEFINED;
2246 pid_t tid = thread_data->tid;
2247
2248 close(thread_data->pipes.msg[1]);
2249 thread_data->pipes.msg[1] = -1;
2250 err = read(thread_data->pipes.ack[0], &ack, sizeof(ack));
2251 if (err > 0)
2252 pr_debug2("threads[%d]: sent %s\n", tid, thread_msg_tags[ack]);
2253 else
2254 pr_warning("threads[%d]: failed to receive termination notification from %d\n",
2255 thread->tid, tid);
2256
2257 return 0;
2258}
2259
2260static int record__start_threads(struct record *rec)
2261{
2262 int t, tt, err, ret = 0, nr_threads = rec->nr_threads;
2263 struct record_thread *thread_data = rec->thread_data;
2264 sigset_t full, mask;
2265 pthread_t handle;
2266 pthread_attr_t attrs;
2267
2268 thread = &thread_data[0];
2269
2270 if (!record__threads_enabled(rec))
2271 return 0;
2272
2273 sigfillset(&full);
2274 if (sigprocmask(SIG_SETMASK, &full, &mask)) {
2275 pr_err("Failed to block signals on threads start: %s\n", strerror(errno));
2276 return -1;
2277 }
2278
2279 pthread_attr_init(&attrs);
2280 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
2281
2282 for (t = 1; t < nr_threads; t++) {
2283 enum thread_msg msg = THREAD_MSG__UNDEFINED;
2284
2285#ifdef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
2286 pthread_attr_setaffinity_np(&attrs,
2287 MMAP_CPU_MASK_BYTES(&(thread_data[t].mask->affinity)),
2288 (cpu_set_t *)(thread_data[t].mask->affinity.bits));
2289#endif
2290 if (pthread_create(&handle, &attrs, record__thread, &thread_data[t])) {
2291 for (tt = 1; tt < t; tt++)
2292 record__terminate_thread(&thread_data[t]);
2293 pr_err("Failed to start threads: %s\n", strerror(errno));
2294 ret = -1;
2295 goto out_err;
2296 }
2297
2298 err = read(thread_data[t].pipes.ack[0], &msg, sizeof(msg));
2299 if (err > 0)
2300 pr_debug2("threads[%d]: sent %s\n", rec->thread_data[t].tid,
2301 thread_msg_tags[msg]);
2302 else
2303 pr_warning("threads[%d]: failed to receive start notification from %d\n",
2304 thread->tid, rec->thread_data[t].tid);
2305 }
2306
2307 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity),
2308 (cpu_set_t *)thread->mask->affinity.bits);
2309
2310 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
2311
2312out_err:
2313 pthread_attr_destroy(&attrs);
2314
2315 if (sigprocmask(SIG_SETMASK, &mask, NULL)) {
2316 pr_err("Failed to unblock signals on threads start: %s\n", strerror(errno));
2317 ret = -1;
2318 }
2319
2320 return ret;
2321}
2322
2323static int record__stop_threads(struct record *rec)
2324{
2325 int t;
2326 struct record_thread *thread_data = rec->thread_data;
2327
2328 for (t = 1; t < rec->nr_threads; t++)
2329 record__terminate_thread(&thread_data[t]);
2330
2331 for (t = 0; t < rec->nr_threads; t++) {
2332 rec->samples += thread_data[t].samples;
2333 if (!record__threads_enabled(rec))
2334 continue;
2335 rec->session->bytes_transferred += thread_data[t].bytes_transferred;
2336 rec->session->bytes_compressed += thread_data[t].bytes_compressed;
2337 pr_debug("threads[%d]: samples=%lld, wakes=%ld, ", thread_data[t].tid,
2338 thread_data[t].samples, thread_data[t].waking);
2339 if (thread_data[t].bytes_transferred && thread_data[t].bytes_compressed)
2340 pr_debug("transferred=%" PRIu64 ", compressed=%" PRIu64 "\n",
2341 thread_data[t].bytes_transferred, thread_data[t].bytes_compressed);
2342 else
2343 pr_debug("written=%" PRIu64 "\n", thread_data[t].bytes_written);
2344 }
2345
2346 return 0;
2347}
2348
2349static unsigned long record__waking(struct record *rec)
2350{
2351 int t;
2352 unsigned long waking = 0;
2353 struct record_thread *thread_data = rec->thread_data;
2354
2355 for (t = 0; t < rec->nr_threads; t++)
2356 waking += thread_data[t].waking;
2357
2358 return waking;
2359}
2360
2361static int __cmd_record(struct record *rec, int argc, const char **argv)
2362{
2363 int err;
2364 int status = 0;
2365 const bool forks = argc > 0;
2366 struct perf_tool *tool = &rec->tool;
2367 struct record_opts *opts = &rec->opts;
2368 struct perf_data *data = &rec->data;
2369 struct perf_session *session;
2370 bool disabled = false, draining = false;
2371 int fd;
2372 float ratio = 0;
2373 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
2374
2375 atexit(record__sig_exit);
2376 signal(SIGCHLD, sig_handler);
2377 signal(SIGINT, sig_handler);
2378 signal(SIGTERM, sig_handler);
2379 signal(SIGSEGV, sigsegv_handler);
2380
2381 if (rec->opts.record_namespaces)
2382 tool->namespace_events = true;
2383
2384 if (rec->opts.record_cgroup) {
2385#ifdef HAVE_FILE_HANDLE
2386 tool->cgroup_events = true;
2387#else
2388 pr_err("cgroup tracking is not supported\n");
2389 return -1;
2390#endif
2391 }
2392
2393 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
2394 signal(SIGUSR2, snapshot_sig_handler);
2395 if (rec->opts.auxtrace_snapshot_mode)
2396 trigger_on(&auxtrace_snapshot_trigger);
2397 if (rec->switch_output.enabled)
2398 trigger_on(&switch_output_trigger);
2399 } else {
2400 signal(SIGUSR2, SIG_IGN);
2401 }
2402
2403 session = perf_session__new(data, tool);
2404 if (IS_ERR(session)) {
2405 pr_err("Perf session creation failed.\n");
2406 return PTR_ERR(session);
2407 }
2408
2409 if (record__threads_enabled(rec)) {
2410 if (perf_data__is_pipe(&rec->data)) {
2411 pr_err("Parallel trace streaming is not available in pipe mode.\n");
2412 return -1;
2413 }
2414 if (rec->opts.full_auxtrace) {
2415 pr_err("Parallel trace streaming is not available in AUX area tracing mode.\n");
2416 return -1;
2417 }
2418 }
2419
2420 fd = perf_data__fd(data);
2421 rec->session = session;
2422
2423 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
2424 pr_err("Compression initialization failed.\n");
2425 return -1;
2426 }
2427#ifdef HAVE_EVENTFD_SUPPORT
2428 done_fd = eventfd(0, EFD_NONBLOCK);
2429 if (done_fd < 0) {
2430 pr_err("Failed to create wakeup eventfd, error: %m\n");
2431 status = -1;
2432 goto out_delete_session;
2433 }
2434 err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
2435 if (err < 0) {
2436 pr_err("Failed to add wakeup eventfd to poll list\n");
2437 status = err;
2438 goto out_delete_session;
2439 }
2440#endif // HAVE_EVENTFD_SUPPORT
2441
2442 session->header.env.comp_type = PERF_COMP_ZSTD;
2443 session->header.env.comp_level = rec->opts.comp_level;
2444
2445 if (rec->opts.kcore &&
2446 !record__kcore_readable(&session->machines.host)) {
2447 pr_err("ERROR: kcore is not readable.\n");
2448 return -1;
2449 }
2450
2451 if (record__init_clock(rec))
2452 return -1;
2453
2454 record__init_features(rec);
2455
2456 if (forks) {
2457 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
2458 workload_exec_failed_signal);
2459 if (err < 0) {
2460 pr_err("Couldn't run the workload!\n");
2461 status = err;
2462 goto out_delete_session;
2463 }
2464 }
2465
2466 /*
2467 * If we have just single event and are sending data
2468 * through pipe, we need to force the ids allocation,
2469 * because we synthesize event name through the pipe
2470 * and need the id for that.
2471 */
2472 if (data->is_pipe && rec->evlist->core.nr_entries == 1)
2473 rec->opts.sample_id = true;
2474
2475 evlist__uniquify_name(rec->evlist);
2476
2477 /* Debug message used by test scripts */
2478 pr_debug3("perf record opening and mmapping events\n");
2479 if (record__open(rec) != 0) {
2480 err = -1;
2481 goto out_free_threads;
2482 }
2483 /* Debug message used by test scripts */
2484 pr_debug3("perf record done opening and mmapping events\n");
2485 session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
2486
2487 if (rec->opts.kcore) {
2488 err = record__kcore_copy(&session->machines.host, data);
2489 if (err) {
2490 pr_err("ERROR: Failed to copy kcore\n");
2491 goto out_free_threads;
2492 }
2493 }
2494
2495 /*
2496 * Normally perf_session__new would do this, but it doesn't have the
2497 * evlist.
2498 */
2499 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
2500 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
2501 rec->tool.ordered_events = false;
2502 }
2503
2504 if (evlist__nr_groups(rec->evlist) == 0)
2505 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
2506
2507 if (data->is_pipe) {
2508 err = perf_header__write_pipe(fd);
2509 if (err < 0)
2510 goto out_free_threads;
2511 } else {
2512 err = perf_session__write_header(session, rec->evlist, fd, false);
2513 if (err < 0)
2514 goto out_free_threads;
2515 }
2516
2517 err = -1;
2518 if (!rec->no_buildid
2519 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
2520 pr_err("Couldn't generate buildids. "
2521 "Use --no-buildid to profile anyway.\n");
2522 goto out_free_threads;
2523 }
2524
2525 err = record__setup_sb_evlist(rec);
2526 if (err)
2527 goto out_free_threads;
2528
2529 err = record__synthesize(rec, false);
2530 if (err < 0)
2531 goto out_free_threads;
2532
2533 if (rec->realtime_prio) {
2534 struct sched_param param;
2535
2536 param.sched_priority = rec->realtime_prio;
2537 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
2538 pr_err("Could not set realtime priority.\n");
2539 err = -1;
2540 goto out_free_threads;
2541 }
2542 }
2543
2544 if (record__start_threads(rec))
2545 goto out_free_threads;
2546
2547 /*
2548 * When perf is starting the traced process, all the events
2549 * (apart from group members) have enable_on_exec=1 set,
2550 * so don't spoil it by prematurely enabling them.
2551 */
2552 if (!target__none(&opts->target) && !opts->target.initial_delay)
2553 evlist__enable(rec->evlist);
2554
2555 /*
2556 * Let the child rip
2557 */
2558 if (forks) {
2559 struct machine *machine = &session->machines.host;
2560 union perf_event *event;
2561 pid_t tgid;
2562
2563 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
2564 if (event == NULL) {
2565 err = -ENOMEM;
2566 goto out_child;
2567 }
2568
2569 /*
2570 * Some H/W events are generated before COMM event
2571 * which is emitted during exec(), so perf script
2572 * cannot see a correct process name for those events.
2573 * Synthesize COMM event to prevent it.
2574 */
2575 tgid = perf_event__synthesize_comm(tool, event,
2576 rec->evlist->workload.pid,
2577 process_synthesized_event,
2578 machine);
2579 free(event);
2580
2581 if (tgid == -1)
2582 goto out_child;
2583
2584 event = malloc(sizeof(event->namespaces) +
2585 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
2586 machine->id_hdr_size);
2587 if (event == NULL) {
2588 err = -ENOMEM;
2589 goto out_child;
2590 }
2591
2592 /*
2593 * Synthesize NAMESPACES event for the command specified.
2594 */
2595 perf_event__synthesize_namespaces(tool, event,
2596 rec->evlist->workload.pid,
2597 tgid, process_synthesized_event,
2598 machine);
2599 free(event);
2600
2601 evlist__start_workload(rec->evlist);
2602 }
2603
2604 if (opts->target.initial_delay) {
2605 pr_info(EVLIST_DISABLED_MSG);
2606 if (opts->target.initial_delay > 0) {
2607 usleep(opts->target.initial_delay * USEC_PER_MSEC);
2608 evlist__enable(rec->evlist);
2609 pr_info(EVLIST_ENABLED_MSG);
2610 }
2611 }
2612
2613 err = event_enable_timer__start(rec->evlist->eet);
2614 if (err)
2615 goto out_child;
2616
2617 /* Debug message used by test scripts */
2618 pr_debug3("perf record has started\n");
2619 fflush(stderr);
2620
2621 trigger_ready(&auxtrace_snapshot_trigger);
2622 trigger_ready(&switch_output_trigger);
2623 perf_hooks__invoke_record_start();
2624
2625 /*
2626 * Must write FINISHED_INIT so it will be seen after all other
2627 * synthesized user events, but before any regular events.
2628 */
2629 err = write_finished_init(rec, false);
2630 if (err < 0)
2631 goto out_child;
2632
2633 for (;;) {
2634 unsigned long long hits = thread->samples;
2635
2636 /*
2637 * rec->evlist->bkw_mmap_state is possible to be
2638 * BKW_MMAP_EMPTY here: when done == true and
2639 * hits != rec->samples in previous round.
2640 *
2641 * evlist__toggle_bkw_mmap ensure we never
2642 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
2643 */
2644 if (trigger_is_hit(&switch_output_trigger) || done || draining)
2645 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
2646
2647 if (record__mmap_read_all(rec, false) < 0) {
2648 trigger_error(&auxtrace_snapshot_trigger);
2649 trigger_error(&switch_output_trigger);
2650 err = -1;
2651 goto out_child;
2652 }
2653
2654 if (auxtrace_record__snapshot_started) {
2655 auxtrace_record__snapshot_started = 0;
2656 if (!trigger_is_error(&auxtrace_snapshot_trigger))
2657 record__read_auxtrace_snapshot(rec, false);
2658 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
2659 pr_err("AUX area tracing snapshot failed\n");
2660 err = -1;
2661 goto out_child;
2662 }
2663 }
2664
2665 if (trigger_is_hit(&switch_output_trigger)) {
2666 /*
2667 * If switch_output_trigger is hit, the data in
2668 * overwritable ring buffer should have been collected,
2669 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
2670 *
2671 * If SIGUSR2 raise after or during record__mmap_read_all(),
2672 * record__mmap_read_all() didn't collect data from
2673 * overwritable ring buffer. Read again.
2674 */
2675 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
2676 continue;
2677 trigger_ready(&switch_output_trigger);
2678
2679 /*
2680 * Reenable events in overwrite ring buffer after
2681 * record__mmap_read_all(): we should have collected
2682 * data from it.
2683 */
2684 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
2685
2686 if (!quiet)
2687 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
2688 record__waking(rec));
2689 thread->waking = 0;
2690 fd = record__switch_output(rec, false);
2691 if (fd < 0) {
2692 pr_err("Failed to switch to new file\n");
2693 trigger_error(&switch_output_trigger);
2694 err = fd;
2695 goto out_child;
2696 }
2697
2698 /* re-arm the alarm */
2699 if (rec->switch_output.time)
2700 alarm(rec->switch_output.time);
2701 }
2702
2703 if (hits == thread->samples) {
2704 if (done || draining)
2705 break;
2706 err = fdarray__poll(&thread->pollfd, -1);
2707 /*
2708 * Propagate error, only if there's any. Ignore positive
2709 * number of returned events and interrupt error.
2710 */
2711 if (err > 0 || (err < 0 && errno == EINTR))
2712 err = 0;
2713 thread->waking++;
2714
2715 if (fdarray__filter(&thread->pollfd, POLLERR | POLLHUP,
2716 record__thread_munmap_filtered, NULL) == 0)
2717 draining = true;
2718
2719 err = record__update_evlist_pollfd_from_thread(rec, rec->evlist, thread);
2720 if (err)
2721 goto out_child;
2722 }
2723
2724 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
2725 switch (cmd) {
2726 case EVLIST_CTL_CMD_SNAPSHOT:
2727 hit_auxtrace_snapshot_trigger(rec);
2728 evlist__ctlfd_ack(rec->evlist);
2729 break;
2730 case EVLIST_CTL_CMD_STOP:
2731 done = 1;
2732 break;
2733 case EVLIST_CTL_CMD_ACK:
2734 case EVLIST_CTL_CMD_UNSUPPORTED:
2735 case EVLIST_CTL_CMD_ENABLE:
2736 case EVLIST_CTL_CMD_DISABLE:
2737 case EVLIST_CTL_CMD_EVLIST:
2738 case EVLIST_CTL_CMD_PING:
2739 default:
2740 break;
2741 }
2742 }
2743
2744 err = event_enable_timer__process(rec->evlist->eet);
2745 if (err < 0)
2746 goto out_child;
2747 if (err) {
2748 err = 0;
2749 done = 1;
2750 }
2751
2752 /*
2753 * When perf is starting the traced process, at the end events
2754 * die with the process and we wait for that. Thus no need to
2755 * disable events in this case.
2756 */
2757 if (done && !disabled && !target__none(&opts->target)) {
2758 trigger_off(&auxtrace_snapshot_trigger);
2759 evlist__disable(rec->evlist);
2760 disabled = true;
2761 }
2762 }
2763
2764 trigger_off(&auxtrace_snapshot_trigger);
2765 trigger_off(&switch_output_trigger);
2766
2767 if (opts->auxtrace_snapshot_on_exit)
2768 record__auxtrace_snapshot_exit(rec);
2769
2770 if (forks && workload_exec_errno) {
2771 char msg[STRERR_BUFSIZE], strevsels[2048];
2772 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
2773
2774 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels);
2775
2776 pr_err("Failed to collect '%s' for the '%s' workload: %s\n",
2777 strevsels, argv[0], emsg);
2778 err = -1;
2779 goto out_child;
2780 }
2781
2782 if (!quiet)
2783 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n",
2784 record__waking(rec));
2785
2786 write_finished_init(rec, true);
2787
2788 if (target__none(&rec->opts.target))
2789 record__synthesize_workload(rec, true);
2790
2791out_child:
2792 record__stop_threads(rec);
2793 record__mmap_read_all(rec, true);
2794out_free_threads:
2795 record__free_thread_data(rec);
2796 evlist__finalize_ctlfd(rec->evlist);
2797 record__aio_mmap_read_sync(rec);
2798
2799 if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
2800 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
2801 session->header.env.comp_ratio = ratio + 0.5;
2802 }
2803
2804 if (forks) {
2805 int exit_status;
2806
2807 if (!child_finished)
2808 kill(rec->evlist->workload.pid, SIGTERM);
2809
2810 wait(&exit_status);
2811
2812 if (err < 0)
2813 status = err;
2814 else if (WIFEXITED(exit_status))
2815 status = WEXITSTATUS(exit_status);
2816 else if (WIFSIGNALED(exit_status))
2817 signr = WTERMSIG(exit_status);
2818 } else
2819 status = err;
2820
2821 if (rec->off_cpu)
2822 rec->bytes_written += off_cpu_write(rec->session);
2823
2824 record__read_lost_samples(rec);
2825 record__synthesize(rec, true);
2826 /* this will be recalculated during process_buildids() */
2827 rec->samples = 0;
2828
2829 if (!err) {
2830 if (!rec->timestamp_filename) {
2831 record__finish_output(rec);
2832 } else {
2833 fd = record__switch_output(rec, true);
2834 if (fd < 0) {
2835 status = fd;
2836 goto out_delete_session;
2837 }
2838 }
2839 }
2840
2841 perf_hooks__invoke_record_end();
2842
2843 if (!err && !quiet) {
2844 char samples[128];
2845 const char *postfix = rec->timestamp_filename ?
2846 ".<timestamp>" : "";
2847
2848 if (rec->samples && !rec->opts.full_auxtrace)
2849 scnprintf(samples, sizeof(samples),
2850 " (%" PRIu64 " samples)", rec->samples);
2851 else
2852 samples[0] = '\0';
2853
2854 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2855 perf_data__size(data) / 1024.0 / 1024.0,
2856 data->path, postfix, samples);
2857 if (ratio) {
2858 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2859 rec->session->bytes_transferred / 1024.0 / 1024.0,
2860 ratio);
2861 }
2862 fprintf(stderr, " ]\n");
2863 }
2864
2865out_delete_session:
2866#ifdef HAVE_EVENTFD_SUPPORT
2867 if (done_fd >= 0) {
2868 fd = done_fd;
2869 done_fd = -1;
2870
2871 close(fd);
2872 }
2873#endif
2874 zstd_fini(&session->zstd_data);
2875 perf_session__delete(session);
2876
2877 if (!opts->no_bpf_event)
2878 evlist__stop_sb_thread(rec->sb_evlist);
2879 return status;
2880}
2881
2882static void callchain_debug(struct callchain_param *callchain)
2883{
2884 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2885
2886 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2887
2888 if (callchain->record_mode == CALLCHAIN_DWARF)
2889 pr_debug("callchain: stack dump size %d\n",
2890 callchain->dump_size);
2891}
2892
2893int record_opts__parse_callchain(struct record_opts *record,
2894 struct callchain_param *callchain,
2895 const char *arg, bool unset)
2896{
2897 int ret;
2898 callchain->enabled = !unset;
2899
2900 /* --no-call-graph */
2901 if (unset) {
2902 callchain->record_mode = CALLCHAIN_NONE;
2903 pr_debug("callchain: disabled\n");
2904 return 0;
2905 }
2906
2907 ret = parse_callchain_record_opt(arg, callchain);
2908 if (!ret) {
2909 /* Enable data address sampling for DWARF unwind. */
2910 if (callchain->record_mode == CALLCHAIN_DWARF)
2911 record->sample_address = true;
2912 callchain_debug(callchain);
2913 }
2914
2915 return ret;
2916}
2917
2918int record_parse_callchain_opt(const struct option *opt,
2919 const char *arg,
2920 int unset)
2921{
2922 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2923}
2924
2925int record_callchain_opt(const struct option *opt,
2926 const char *arg __maybe_unused,
2927 int unset __maybe_unused)
2928{
2929 struct callchain_param *callchain = opt->value;
2930
2931 callchain->enabled = true;
2932
2933 if (callchain->record_mode == CALLCHAIN_NONE)
2934 callchain->record_mode = CALLCHAIN_FP;
2935
2936 callchain_debug(callchain);
2937 return 0;
2938}
2939
2940static int perf_record_config(const char *var, const char *value, void *cb)
2941{
2942 struct record *rec = cb;
2943
2944 if (!strcmp(var, "record.build-id")) {
2945 if (!strcmp(value, "cache"))
2946 rec->no_buildid_cache = false;
2947 else if (!strcmp(value, "no-cache"))
2948 rec->no_buildid_cache = true;
2949 else if (!strcmp(value, "skip"))
2950 rec->no_buildid = true;
2951 else if (!strcmp(value, "mmap"))
2952 rec->buildid_mmap = true;
2953 else
2954 return -1;
2955 return 0;
2956 }
2957 if (!strcmp(var, "record.call-graph")) {
2958 var = "call-graph.record-mode";
2959 return perf_default_config(var, value, cb);
2960 }
2961#ifdef HAVE_AIO_SUPPORT
2962 if (!strcmp(var, "record.aio")) {
2963 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2964 if (!rec->opts.nr_cblocks)
2965 rec->opts.nr_cblocks = nr_cblocks_default;
2966 }
2967#endif
2968 if (!strcmp(var, "record.debuginfod")) {
2969 rec->debuginfod.urls = strdup(value);
2970 if (!rec->debuginfod.urls)
2971 return -ENOMEM;
2972 rec->debuginfod.set = true;
2973 }
2974
2975 return 0;
2976}
2977
2978static int record__parse_event_enable_time(const struct option *opt, const char *str, int unset)
2979{
2980 struct record *rec = (struct record *)opt->value;
2981
2982 return evlist__parse_event_enable_time(rec->evlist, &rec->opts, str, unset);
2983}
2984
2985static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2986{
2987 struct record_opts *opts = (struct record_opts *)opt->value;
2988
2989 if (unset || !str)
2990 return 0;
2991
2992 if (!strcasecmp(str, "node"))
2993 opts->affinity = PERF_AFFINITY_NODE;
2994 else if (!strcasecmp(str, "cpu"))
2995 opts->affinity = PERF_AFFINITY_CPU;
2996
2997 return 0;
2998}
2999
3000static int record__mmap_cpu_mask_alloc(struct mmap_cpu_mask *mask, int nr_bits)
3001{
3002 mask->nbits = nr_bits;
3003 mask->bits = bitmap_zalloc(mask->nbits);
3004 if (!mask->bits)
3005 return -ENOMEM;
3006
3007 return 0;
3008}
3009
3010static void record__mmap_cpu_mask_free(struct mmap_cpu_mask *mask)
3011{
3012 bitmap_free(mask->bits);
3013 mask->nbits = 0;
3014}
3015
3016static int record__thread_mask_alloc(struct thread_mask *mask, int nr_bits)
3017{
3018 int ret;
3019
3020 ret = record__mmap_cpu_mask_alloc(&mask->maps, nr_bits);
3021 if (ret) {
3022 mask->affinity.bits = NULL;
3023 return ret;
3024 }
3025
3026 ret = record__mmap_cpu_mask_alloc(&mask->affinity, nr_bits);
3027 if (ret) {
3028 record__mmap_cpu_mask_free(&mask->maps);
3029 mask->maps.bits = NULL;
3030 }
3031
3032 return ret;
3033}
3034
3035static void record__thread_mask_free(struct thread_mask *mask)
3036{
3037 record__mmap_cpu_mask_free(&mask->maps);
3038 record__mmap_cpu_mask_free(&mask->affinity);
3039}
3040
3041static int record__parse_threads(const struct option *opt, const char *str, int unset)
3042{
3043 int s;
3044 struct record_opts *opts = opt->value;
3045
3046 if (unset || !str || !strlen(str)) {
3047 opts->threads_spec = THREAD_SPEC__CPU;
3048 } else {
3049 for (s = 1; s < THREAD_SPEC__MAX; s++) {
3050 if (s == THREAD_SPEC__USER) {
3051 opts->threads_user_spec = strdup(str);
3052 if (!opts->threads_user_spec)
3053 return -ENOMEM;
3054 opts->threads_spec = THREAD_SPEC__USER;
3055 break;
3056 }
3057 if (!strncasecmp(str, thread_spec_tags[s], strlen(thread_spec_tags[s]))) {
3058 opts->threads_spec = s;
3059 break;
3060 }
3061 }
3062 }
3063
3064 if (opts->threads_spec == THREAD_SPEC__USER)
3065 pr_debug("threads_spec: %s\n", opts->threads_user_spec);
3066 else
3067 pr_debug("threads_spec: %s\n", thread_spec_tags[opts->threads_spec]);
3068
3069 return 0;
3070}
3071
3072static int parse_output_max_size(const struct option *opt,
3073 const char *str, int unset)
3074{
3075 unsigned long *s = (unsigned long *)opt->value;
3076 static struct parse_tag tags_size[] = {
3077 { .tag = 'B', .mult = 1 },
3078 { .tag = 'K', .mult = 1 << 10 },
3079 { .tag = 'M', .mult = 1 << 20 },
3080 { .tag = 'G', .mult = 1 << 30 },
3081 { .tag = 0 },
3082 };
3083 unsigned long val;
3084
3085 if (unset) {
3086 *s = 0;
3087 return 0;
3088 }
3089
3090 val = parse_tag_value(str, tags_size);
3091 if (val != (unsigned long) -1) {
3092 *s = val;
3093 return 0;
3094 }
3095
3096 return -1;
3097}
3098
3099static int record__parse_mmap_pages(const struct option *opt,
3100 const char *str,
3101 int unset __maybe_unused)
3102{
3103 struct record_opts *opts = opt->value;
3104 char *s, *p;
3105 unsigned int mmap_pages;
3106 int ret;
3107
3108 if (!str)
3109 return -EINVAL;
3110
3111 s = strdup(str);
3112 if (!s)
3113 return -ENOMEM;
3114
3115 p = strchr(s, ',');
3116 if (p)
3117 *p = '\0';
3118
3119 if (*s) {
3120 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
3121 if (ret)
3122 goto out_free;
3123 opts->mmap_pages = mmap_pages;
3124 }
3125
3126 if (!p) {
3127 ret = 0;
3128 goto out_free;
3129 }
3130
3131 ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
3132 if (ret)
3133 goto out_free;
3134
3135 opts->auxtrace_mmap_pages = mmap_pages;
3136
3137out_free:
3138 free(s);
3139 return ret;
3140}
3141
3142void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused)
3143{
3144}
3145
3146static int parse_control_option(const struct option *opt,
3147 const char *str,
3148 int unset __maybe_unused)
3149{
3150 struct record_opts *opts = opt->value;
3151
3152 return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
3153}
3154
3155static void switch_output_size_warn(struct record *rec)
3156{
3157 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
3158 struct switch_output *s = &rec->switch_output;
3159
3160 wakeup_size /= 2;
3161
3162 if (s->size < wakeup_size) {
3163 char buf[100];
3164
3165 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
3166 pr_warning("WARNING: switch-output data size lower than "
3167 "wakeup kernel buffer size (%s) "
3168 "expect bigger perf.data sizes\n", buf);
3169 }
3170}
3171
3172static int switch_output_setup(struct record *rec)
3173{
3174 struct switch_output *s = &rec->switch_output;
3175 static struct parse_tag tags_size[] = {
3176 { .tag = 'B', .mult = 1 },
3177 { .tag = 'K', .mult = 1 << 10 },
3178 { .tag = 'M', .mult = 1 << 20 },
3179 { .tag = 'G', .mult = 1 << 30 },
3180 { .tag = 0 },
3181 };
3182 static struct parse_tag tags_time[] = {
3183 { .tag = 's', .mult = 1 },
3184 { .tag = 'm', .mult = 60 },
3185 { .tag = 'h', .mult = 60*60 },
3186 { .tag = 'd', .mult = 60*60*24 },
3187 { .tag = 0 },
3188 };
3189 unsigned long val;
3190
3191 /*
3192 * If we're using --switch-output-events, then we imply its
3193 * --switch-output=signal, as we'll send a SIGUSR2 from the side band
3194 * thread to its parent.
3195 */
3196 if (rec->switch_output_event_set) {
3197 if (record__threads_enabled(rec)) {
3198 pr_warning("WARNING: --switch-output-event option is not available in parallel streaming mode.\n");
3199 return 0;
3200 }
3201 goto do_signal;
3202 }
3203
3204 if (!s->set)
3205 return 0;
3206
3207 if (record__threads_enabled(rec)) {
3208 pr_warning("WARNING: --switch-output option is not available in parallel streaming mode.\n");
3209 return 0;
3210 }
3211
3212 if (!strcmp(s->str, "signal")) {
3213do_signal:
3214 s->signal = true;
3215 pr_debug("switch-output with SIGUSR2 signal\n");
3216 goto enabled;
3217 }
3218
3219 val = parse_tag_value(s->str, tags_size);
3220 if (val != (unsigned long) -1) {
3221 s->size = val;
3222 pr_debug("switch-output with %s size threshold\n", s->str);
3223 goto enabled;
3224 }
3225
3226 val = parse_tag_value(s->str, tags_time);
3227 if (val != (unsigned long) -1) {
3228 s->time = val;
3229 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
3230 s->str, s->time);
3231 goto enabled;
3232 }
3233
3234 return -1;
3235
3236enabled:
3237 rec->timestamp_filename = true;
3238 s->enabled = true;
3239
3240 if (s->size && !rec->opts.no_buffering)
3241 switch_output_size_warn(rec);
3242
3243 return 0;
3244}
3245
3246static const char * const __record_usage[] = {
3247 "perf record [<options>] [<command>]",
3248 "perf record [<options>] -- <command> [<options>]",
3249 NULL
3250};
3251const char * const *record_usage = __record_usage;
3252
3253static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
3254 struct perf_sample *sample, struct machine *machine)
3255{
3256 /*
3257 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
3258 * no need to add them twice.
3259 */
3260 if (!(event->header.misc & PERF_RECORD_MISC_USER))
3261 return 0;
3262 return perf_event__process_mmap(tool, event, sample, machine);
3263}
3264
3265static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
3266 struct perf_sample *sample, struct machine *machine)
3267{
3268 /*
3269 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
3270 * no need to add them twice.
3271 */
3272 if (!(event->header.misc & PERF_RECORD_MISC_USER))
3273 return 0;
3274
3275 return perf_event__process_mmap2(tool, event, sample, machine);
3276}
3277
3278static int process_timestamp_boundary(struct perf_tool *tool,
3279 union perf_event *event __maybe_unused,
3280 struct perf_sample *sample,
3281 struct machine *machine __maybe_unused)
3282{
3283 struct record *rec = container_of(tool, struct record, tool);
3284
3285 set_timestamp_boundary(rec, sample->time);
3286 return 0;
3287}
3288
3289static int parse_record_synth_option(const struct option *opt,
3290 const char *str,
3291 int unset __maybe_unused)
3292{
3293 struct record_opts *opts = opt->value;
3294 char *p = strdup(str);
3295
3296 if (p == NULL)
3297 return -1;
3298
3299 opts->synth = parse_synth_opt(p);
3300 free(p);
3301
3302 if (opts->synth < 0) {
3303 pr_err("Invalid synth option: %s\n", str);
3304 return -1;
3305 }
3306 return 0;
3307}
3308
3309/*
3310 * XXX Ideally would be local to cmd_record() and passed to a record__new
3311 * because we need to have access to it in record__exit, that is called
3312 * after cmd_record() exits, but since record_options need to be accessible to
3313 * builtin-script, leave it here.
3314 *
3315 * At least we don't ouch it in all the other functions here directly.
3316 *
3317 * Just say no to tons of global variables, sigh.
3318 */
3319static struct record record = {
3320 .opts = {
3321 .sample_time = true,
3322 .mmap_pages = UINT_MAX,
3323 .user_freq = UINT_MAX,
3324 .user_interval = ULLONG_MAX,
3325 .freq = 4000,
3326 .target = {
3327 .uses_mmap = true,
3328 .default_per_cpu = true,
3329 },
3330 .mmap_flush = MMAP_FLUSH_DEFAULT,
3331 .nr_threads_synthesize = 1,
3332 .ctl_fd = -1,
3333 .ctl_fd_ack = -1,
3334 .synth = PERF_SYNTH_ALL,
3335 },
3336 .tool = {
3337 .sample = process_sample_event,
3338 .fork = perf_event__process_fork,
3339 .exit = perf_event__process_exit,
3340 .comm = perf_event__process_comm,
3341 .namespaces = perf_event__process_namespaces,
3342 .mmap = build_id__process_mmap,
3343 .mmap2 = build_id__process_mmap2,
3344 .itrace_start = process_timestamp_boundary,
3345 .aux = process_timestamp_boundary,
3346 .ordered_events = true,
3347 },
3348};
3349
3350const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
3351 "\n\t\t\t\tDefault: fp";
3352
3353static bool dry_run;
3354
3355static struct parse_events_option_args parse_events_option_args = {
3356 .evlistp = &record.evlist,
3357};
3358
3359static struct parse_events_option_args switch_output_parse_events_option_args = {
3360 .evlistp = &record.sb_evlist,
3361};
3362
3363/*
3364 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
3365 * with it and switch to use the library functions in perf_evlist that came
3366 * from builtin-record.c, i.e. use record_opts,
3367 * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
3368 * using pipes, etc.
3369 */
3370static struct option __record_options[] = {
3371 OPT_CALLBACK('e', "event", &parse_events_option_args, "event",
3372 "event selector. use 'perf list' to list available events",
3373 parse_events_option),
3374 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
3375 "event filter", parse_filter),
3376 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
3377 NULL, "don't record events from perf itself",
3378 exclude_perf),
3379 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
3380 "record events on existing process id"),
3381 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
3382 "record events on existing thread id"),
3383 OPT_INTEGER('r', "realtime", &record.realtime_prio,
3384 "collect data with this RT SCHED_FIFO priority"),
3385 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
3386 "collect data without buffering"),
3387 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
3388 "collect raw sample records from all opened counters"),
3389 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
3390 "system-wide collection from all CPUs"),
3391 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
3392 "list of cpus to monitor"),
3393 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
3394 OPT_STRING('o', "output", &record.data.path, "file",
3395 "output file name"),
3396 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
3397 &record.opts.no_inherit_set,
3398 "child tasks do not inherit counters"),
3399 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
3400 "synthesize non-sample events at the end of output"),
3401 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
3402 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
3403 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
3404 "Fail if the specified frequency can't be used"),
3405 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
3406 "profile at this frequency",
3407 record__parse_freq),
3408 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
3409 "number of mmap data pages and AUX area tracing mmap pages",
3410 record__parse_mmap_pages),
3411 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
3412 "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
3413 record__mmap_flush_parse),
3414 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
3415 NULL, "enables call-graph recording" ,
3416 &record_callchain_opt),
3417 OPT_CALLBACK(0, "call-graph", &record.opts,
3418 "record_mode[,record_size]", record_callchain_help,
3419 &record_parse_callchain_opt),
3420 OPT_INCR('v', "verbose", &verbose,
3421 "be more verbose (show counter open errors, etc)"),
3422 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any warnings or messages"),
3423 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
3424 "per thread counts"),
3425 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
3426 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
3427 "Record the sample physical addresses"),
3428 OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
3429 "Record the sampled data address data page size"),
3430 OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
3431 "Record the sampled code address (ip) page size"),
3432 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
3433 OPT_BOOLEAN(0, "sample-identifier", &record.opts.sample_identifier,
3434 "Record the sample identifier"),
3435 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
3436 &record.opts.sample_time_set,
3437 "Record the sample timestamps"),
3438 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
3439 "Record the sample period"),
3440 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
3441 "don't sample"),
3442 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
3443 &record.no_buildid_cache_set,
3444 "do not update the buildid cache"),
3445 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
3446 &record.no_buildid_set,
3447 "do not collect buildids in perf.data"),
3448 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
3449 "monitor event in cgroup name only",
3450 parse_cgroups),
3451 OPT_CALLBACK('D', "delay", &record, "ms",
3452 "ms to wait before starting measurement after program start (-1: start with events disabled), "
3453 "or ranges of time to enable events e.g. '-D 10-20,30-40'",
3454 record__parse_event_enable_time),
3455 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
3456 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
3457 "user to profile"),
3458
3459 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
3460 "branch any", "sample any taken branches",
3461 parse_branch_stack),
3462
3463 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
3464 "branch filter mask", "branch stack filter modes",
3465 parse_branch_stack),
3466 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
3467 "sample by weight (on special events only)"),
3468 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
3469 "sample transaction flags (special events only)"),
3470 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
3471 "use per-thread mmaps"),
3472 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
3473 "sample selected machine registers on interrupt,"
3474 " use '-I?' to list register names", parse_intr_regs),
3475 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
3476 "sample selected machine registers on interrupt,"
3477 " use '--user-regs=?' to list register names", parse_user_regs),
3478 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
3479 "Record running/enabled time of read (:S) events"),
3480 OPT_CALLBACK('k', "clockid", &record.opts,
3481 "clockid", "clockid to use for events, see clock_gettime()",
3482 parse_clockid),
3483 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
3484 "opts", "AUX area tracing Snapshot Mode", ""),
3485 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
3486 "opts", "sample AUX area", ""),
3487 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
3488 "per thread proc mmap processing timeout in ms"),
3489 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
3490 "Record namespaces events"),
3491 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
3492 "Record cgroup events"),
3493 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
3494 &record.opts.record_switch_events_set,
3495 "Record context switch events"),
3496 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
3497 "Configure all used events to run in kernel space.",
3498 PARSE_OPT_EXCLUSIVE),
3499 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
3500 "Configure all used events to run in user space.",
3501 PARSE_OPT_EXCLUSIVE),
3502 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
3503 "collect kernel callchains"),
3504 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
3505 "collect user callchains"),
3506 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
3507 "file", "vmlinux pathname"),
3508 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
3509 "Record build-id of all DSOs regardless of hits"),
3510 OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
3511 "Record build-id in map events"),
3512 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
3513 "append timestamp to output filename"),
3514 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
3515 "Record timestamp boundary (time of first/last samples)"),
3516 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
3517 &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
3518 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
3519 "signal"),
3520 OPT_CALLBACK_SET(0, "switch-output-event", &switch_output_parse_events_option_args,
3521 &record.switch_output_event_set, "switch output event",
3522 "switch output event selector. use 'perf list' to list available events",
3523 parse_events_option_new_evlist),
3524 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
3525 "Limit number of switch output generated files"),
3526 OPT_BOOLEAN(0, "dry-run", &dry_run,
3527 "Parse options then exit"),
3528#ifdef HAVE_AIO_SUPPORT
3529 OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
3530 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
3531 record__aio_parse),
3532#endif
3533 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
3534 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
3535 record__parse_affinity),
3536#ifdef HAVE_ZSTD_SUPPORT
3537 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, "n",
3538 "Compress records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
3539 record__parse_comp_level),
3540#endif
3541 OPT_CALLBACK(0, "max-size", &record.output_max_size,
3542 "size", "Limit the maximum size of the output file", parse_output_max_size),
3543 OPT_UINTEGER(0, "num-thread-synthesize",
3544 &record.opts.nr_threads_synthesize,
3545 "number of threads to run for event synthesis"),
3546#ifdef HAVE_LIBPFM
3547 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
3548 "libpfm4 event selector. use 'perf list' to list available events",
3549 parse_libpfm_events_option),
3550#endif
3551 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
3552 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
3553 "\t\t\t 'snapshot': AUX area tracing snapshot).\n"
3554 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
3555 "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
3556 parse_control_option),
3557 OPT_CALLBACK(0, "synth", &record.opts, "no|all|task|mmap|cgroup",
3558 "Fine-tune event synthesis: default=all", parse_record_synth_option),
3559 OPT_STRING_OPTARG_SET(0, "debuginfod", &record.debuginfod.urls,
3560 &record.debuginfod.set, "debuginfod urls",
3561 "Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
3562 "system"),
3563 OPT_CALLBACK_OPTARG(0, "threads", &record.opts, NULL, "spec",
3564 "write collected trace data into several data files using parallel threads",
3565 record__parse_threads),
3566 OPT_BOOLEAN(0, "off-cpu", &record.off_cpu, "Enable off-cpu analysis"),
3567 OPT_END()
3568};
3569
3570struct option *record_options = __record_options;
3571
3572static int record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cpu_map *cpus)
3573{
3574 struct perf_cpu cpu;
3575 int idx;
3576
3577 if (cpu_map__is_dummy(cpus))
3578 return 0;
3579
3580 perf_cpu_map__for_each_cpu_skip_any(cpu, idx, cpus) {
3581 /* Return ENODEV is input cpu is greater than max cpu */
3582 if ((unsigned long)cpu.cpu > mask->nbits)
3583 return -ENODEV;
3584 __set_bit(cpu.cpu, mask->bits);
3585 }
3586
3587 return 0;
3588}
3589
3590static int record__mmap_cpu_mask_init_spec(struct mmap_cpu_mask *mask, const char *mask_spec)
3591{
3592 struct perf_cpu_map *cpus;
3593
3594 cpus = perf_cpu_map__new(mask_spec);
3595 if (!cpus)
3596 return -ENOMEM;
3597
3598 bitmap_zero(mask->bits, mask->nbits);
3599 if (record__mmap_cpu_mask_init(mask, cpus))
3600 return -ENODEV;
3601
3602 perf_cpu_map__put(cpus);
3603
3604 return 0;
3605}
3606
3607static void record__free_thread_masks(struct record *rec, int nr_threads)
3608{
3609 int t;
3610
3611 if (rec->thread_masks)
3612 for (t = 0; t < nr_threads; t++)
3613 record__thread_mask_free(&rec->thread_masks[t]);
3614
3615 zfree(&rec->thread_masks);
3616}
3617
3618static int record__alloc_thread_masks(struct record *rec, int nr_threads, int nr_bits)
3619{
3620 int t, ret;
3621
3622 rec->thread_masks = zalloc(nr_threads * sizeof(*(rec->thread_masks)));
3623 if (!rec->thread_masks) {
3624 pr_err("Failed to allocate thread masks\n");
3625 return -ENOMEM;
3626 }
3627
3628 for (t = 0; t < nr_threads; t++) {
3629 ret = record__thread_mask_alloc(&rec->thread_masks[t], nr_bits);
3630 if (ret) {
3631 pr_err("Failed to allocate thread masks[%d]\n", t);
3632 goto out_free;
3633 }
3634 }
3635
3636 return 0;
3637
3638out_free:
3639 record__free_thread_masks(rec, nr_threads);
3640
3641 return ret;
3642}
3643
3644static int record__init_thread_cpu_masks(struct record *rec, struct perf_cpu_map *cpus)
3645{
3646 int t, ret, nr_cpus = perf_cpu_map__nr(cpus);
3647
3648 ret = record__alloc_thread_masks(rec, nr_cpus, cpu__max_cpu().cpu);
3649 if (ret)
3650 return ret;
3651
3652 rec->nr_threads = nr_cpus;
3653 pr_debug("nr_threads: %d\n", rec->nr_threads);
3654
3655 for (t = 0; t < rec->nr_threads; t++) {
3656 __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].maps.bits);
3657 __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].affinity.bits);
3658 if (verbose > 0) {
3659 pr_debug("thread_masks[%d]: ", t);
3660 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps");
3661 pr_debug("thread_masks[%d]: ", t);
3662 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity");
3663 }
3664 }
3665
3666 return 0;
3667}
3668
3669static int record__init_thread_masks_spec(struct record *rec, struct perf_cpu_map *cpus,
3670 const char **maps_spec, const char **affinity_spec,
3671 u32 nr_spec)
3672{
3673 u32 s;
3674 int ret = 0, t = 0;
3675 struct mmap_cpu_mask cpus_mask;
3676 struct thread_mask thread_mask, full_mask, *thread_masks;
3677
3678 ret = record__mmap_cpu_mask_alloc(&cpus_mask, cpu__max_cpu().cpu);
3679 if (ret) {
3680 pr_err("Failed to allocate CPUs mask\n");
3681 return ret;
3682 }
3683
3684 ret = record__mmap_cpu_mask_init(&cpus_mask, cpus);
3685 if (ret) {
3686 pr_err("Failed to init cpu mask\n");
3687 goto out_free_cpu_mask;
3688 }
3689
3690 ret = record__thread_mask_alloc(&full_mask, cpu__max_cpu().cpu);
3691 if (ret) {
3692 pr_err("Failed to allocate full mask\n");
3693 goto out_free_cpu_mask;
3694 }
3695
3696 ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu);
3697 if (ret) {
3698 pr_err("Failed to allocate thread mask\n");
3699 goto out_free_full_and_cpu_masks;
3700 }
3701
3702 for (s = 0; s < nr_spec; s++) {
3703 ret = record__mmap_cpu_mask_init_spec(&thread_mask.maps, maps_spec[s]);
3704 if (ret) {
3705 pr_err("Failed to initialize maps thread mask\n");
3706 goto out_free;
3707 }
3708 ret = record__mmap_cpu_mask_init_spec(&thread_mask.affinity, affinity_spec[s]);
3709 if (ret) {
3710 pr_err("Failed to initialize affinity thread mask\n");
3711 goto out_free;
3712 }
3713
3714 /* ignore invalid CPUs but do not allow empty masks */
3715 if (!bitmap_and(thread_mask.maps.bits, thread_mask.maps.bits,
3716 cpus_mask.bits, thread_mask.maps.nbits)) {
3717 pr_err("Empty maps mask: %s\n", maps_spec[s]);
3718 ret = -EINVAL;
3719 goto out_free;
3720 }
3721 if (!bitmap_and(thread_mask.affinity.bits, thread_mask.affinity.bits,
3722 cpus_mask.bits, thread_mask.affinity.nbits)) {
3723 pr_err("Empty affinity mask: %s\n", affinity_spec[s]);
3724 ret = -EINVAL;
3725 goto out_free;
3726 }
3727
3728 /* do not allow intersection with other masks (full_mask) */
3729 if (bitmap_intersects(thread_mask.maps.bits, full_mask.maps.bits,
3730 thread_mask.maps.nbits)) {
3731 pr_err("Intersecting maps mask: %s\n", maps_spec[s]);
3732 ret = -EINVAL;
3733 goto out_free;
3734 }
3735 if (bitmap_intersects(thread_mask.affinity.bits, full_mask.affinity.bits,
3736 thread_mask.affinity.nbits)) {
3737 pr_err("Intersecting affinity mask: %s\n", affinity_spec[s]);
3738 ret = -EINVAL;
3739 goto out_free;
3740 }
3741
3742 bitmap_or(full_mask.maps.bits, full_mask.maps.bits,
3743 thread_mask.maps.bits, full_mask.maps.nbits);
3744 bitmap_or(full_mask.affinity.bits, full_mask.affinity.bits,
3745 thread_mask.affinity.bits, full_mask.maps.nbits);
3746
3747 thread_masks = realloc(rec->thread_masks, (t + 1) * sizeof(struct thread_mask));
3748 if (!thread_masks) {
3749 pr_err("Failed to reallocate thread masks\n");
3750 ret = -ENOMEM;
3751 goto out_free;
3752 }
3753 rec->thread_masks = thread_masks;
3754 rec->thread_masks[t] = thread_mask;
3755 if (verbose > 0) {
3756 pr_debug("thread_masks[%d]: ", t);
3757 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps");
3758 pr_debug("thread_masks[%d]: ", t);
3759 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity");
3760 }
3761 t++;
3762 ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu);
3763 if (ret) {
3764 pr_err("Failed to allocate thread mask\n");
3765 goto out_free_full_and_cpu_masks;
3766 }
3767 }
3768 rec->nr_threads = t;
3769 pr_debug("nr_threads: %d\n", rec->nr_threads);
3770 if (!rec->nr_threads)
3771 ret = -EINVAL;
3772
3773out_free:
3774 record__thread_mask_free(&thread_mask);
3775out_free_full_and_cpu_masks:
3776 record__thread_mask_free(&full_mask);
3777out_free_cpu_mask:
3778 record__mmap_cpu_mask_free(&cpus_mask);
3779
3780 return ret;
3781}
3782
3783static int record__init_thread_core_masks(struct record *rec, struct perf_cpu_map *cpus)
3784{
3785 int ret;
3786 struct cpu_topology *topo;
3787
3788 topo = cpu_topology__new();
3789 if (!topo) {
3790 pr_err("Failed to allocate CPU topology\n");
3791 return -ENOMEM;
3792 }
3793
3794 ret = record__init_thread_masks_spec(rec, cpus, topo->core_cpus_list,
3795 topo->core_cpus_list, topo->core_cpus_lists);
3796 cpu_topology__delete(topo);
3797
3798 return ret;
3799}
3800
3801static int record__init_thread_package_masks(struct record *rec, struct perf_cpu_map *cpus)
3802{
3803 int ret;
3804 struct cpu_topology *topo;
3805
3806 topo = cpu_topology__new();
3807 if (!topo) {
3808 pr_err("Failed to allocate CPU topology\n");
3809 return -ENOMEM;
3810 }
3811
3812 ret = record__init_thread_masks_spec(rec, cpus, topo->package_cpus_list,
3813 topo->package_cpus_list, topo->package_cpus_lists);
3814 cpu_topology__delete(topo);
3815
3816 return ret;
3817}
3818
3819static int record__init_thread_numa_masks(struct record *rec, struct perf_cpu_map *cpus)
3820{
3821 u32 s;
3822 int ret;
3823 const char **spec;
3824 struct numa_topology *topo;
3825
3826 topo = numa_topology__new();
3827 if (!topo) {
3828 pr_err("Failed to allocate NUMA topology\n");
3829 return -ENOMEM;
3830 }
3831
3832 spec = zalloc(topo->nr * sizeof(char *));
3833 if (!spec) {
3834 pr_err("Failed to allocate NUMA spec\n");
3835 ret = -ENOMEM;
3836 goto out_delete_topo;
3837 }
3838 for (s = 0; s < topo->nr; s++)
3839 spec[s] = topo->nodes[s].cpus;
3840
3841 ret = record__init_thread_masks_spec(rec, cpus, spec, spec, topo->nr);
3842
3843 zfree(&spec);
3844
3845out_delete_topo:
3846 numa_topology__delete(topo);
3847
3848 return ret;
3849}
3850
3851static int record__init_thread_user_masks(struct record *rec, struct perf_cpu_map *cpus)
3852{
3853 int t, ret;
3854 u32 s, nr_spec = 0;
3855 char **maps_spec = NULL, **affinity_spec = NULL, **tmp_spec;
3856 char *user_spec, *spec, *spec_ptr, *mask, *mask_ptr, *dup_mask = NULL;
3857
3858 for (t = 0, user_spec = (char *)rec->opts.threads_user_spec; ; t++, user_spec = NULL) {
3859 spec = strtok_r(user_spec, ":", &spec_ptr);
3860 if (spec == NULL)
3861 break;
3862 pr_debug2("threads_spec[%d]: %s\n", t, spec);
3863 mask = strtok_r(spec, "/", &mask_ptr);
3864 if (mask == NULL)
3865 break;
3866 pr_debug2(" maps mask: %s\n", mask);
3867 tmp_spec = realloc(maps_spec, (nr_spec + 1) * sizeof(char *));
3868 if (!tmp_spec) {
3869 pr_err("Failed to reallocate maps spec\n");
3870 ret = -ENOMEM;
3871 goto out_free;
3872 }
3873 maps_spec = tmp_spec;
3874 maps_spec[nr_spec] = dup_mask = strdup(mask);
3875 if (!maps_spec[nr_spec]) {
3876 pr_err("Failed to allocate maps spec[%d]\n", nr_spec);
3877 ret = -ENOMEM;
3878 goto out_free;
3879 }
3880 mask = strtok_r(NULL, "/", &mask_ptr);
3881 if (mask == NULL) {
3882 pr_err("Invalid thread maps or affinity specs\n");
3883 ret = -EINVAL;
3884 goto out_free;
3885 }
3886 pr_debug2(" affinity mask: %s\n", mask);
3887 tmp_spec = realloc(affinity_spec, (nr_spec + 1) * sizeof(char *));
3888 if (!tmp_spec) {
3889 pr_err("Failed to reallocate affinity spec\n");
3890 ret = -ENOMEM;
3891 goto out_free;
3892 }
3893 affinity_spec = tmp_spec;
3894 affinity_spec[nr_spec] = strdup(mask);
3895 if (!affinity_spec[nr_spec]) {
3896 pr_err("Failed to allocate affinity spec[%d]\n", nr_spec);
3897 ret = -ENOMEM;
3898 goto out_free;
3899 }
3900 dup_mask = NULL;
3901 nr_spec++;
3902 }
3903
3904 ret = record__init_thread_masks_spec(rec, cpus, (const char **)maps_spec,
3905 (const char **)affinity_spec, nr_spec);
3906
3907out_free:
3908 free(dup_mask);
3909 for (s = 0; s < nr_spec; s++) {
3910 if (maps_spec)
3911 free(maps_spec[s]);
3912 if (affinity_spec)
3913 free(affinity_spec[s]);
3914 }
3915 free(affinity_spec);
3916 free(maps_spec);
3917
3918 return ret;
3919}
3920
3921static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus)
3922{
3923 int ret;
3924
3925 ret = record__alloc_thread_masks(rec, 1, cpu__max_cpu().cpu);
3926 if (ret)
3927 return ret;
3928
3929 if (record__mmap_cpu_mask_init(&rec->thread_masks->maps, cpus))
3930 return -ENODEV;
3931
3932 rec->nr_threads = 1;
3933
3934 return 0;
3935}
3936
3937static int record__init_thread_masks(struct record *rec)
3938{
3939 int ret = 0;
3940 struct perf_cpu_map *cpus = rec->evlist->core.all_cpus;
3941
3942 if (!record__threads_enabled(rec))
3943 return record__init_thread_default_masks(rec, cpus);
3944
3945 if (evlist__per_thread(rec->evlist)) {
3946 pr_err("--per-thread option is mutually exclusive to parallel streaming mode.\n");
3947 return -EINVAL;
3948 }
3949
3950 switch (rec->opts.threads_spec) {
3951 case THREAD_SPEC__CPU:
3952 ret = record__init_thread_cpu_masks(rec, cpus);
3953 break;
3954 case THREAD_SPEC__CORE:
3955 ret = record__init_thread_core_masks(rec, cpus);
3956 break;
3957 case THREAD_SPEC__PACKAGE:
3958 ret = record__init_thread_package_masks(rec, cpus);
3959 break;
3960 case THREAD_SPEC__NUMA:
3961 ret = record__init_thread_numa_masks(rec, cpus);
3962 break;
3963 case THREAD_SPEC__USER:
3964 ret = record__init_thread_user_masks(rec, cpus);
3965 break;
3966 default:
3967 break;
3968 }
3969
3970 return ret;
3971}
3972
3973int cmd_record(int argc, const char **argv)
3974{
3975 int err;
3976 struct record *rec = &record;
3977 char errbuf[BUFSIZ];
3978
3979 setlocale(LC_ALL, "");
3980
3981#ifndef HAVE_BPF_SKEL
3982# define set_nobuild(s, l, m, c) set_option_nobuild(record_options, s, l, m, c)
3983 set_nobuild('\0', "off-cpu", "no BUILD_BPF_SKEL=1", true);
3984# undef set_nobuild
3985#endif
3986
3987 /* Disable eager loading of kernel symbols that adds overhead to perf record. */
3988 symbol_conf.lazy_load_kernel_maps = true;
3989 rec->opts.affinity = PERF_AFFINITY_SYS;
3990
3991 rec->evlist = evlist__new();
3992 if (rec->evlist == NULL)
3993 return -ENOMEM;
3994
3995 err = perf_config(perf_record_config, rec);
3996 if (err)
3997 return err;
3998
3999 argc = parse_options(argc, argv, record_options, record_usage,
4000 PARSE_OPT_STOP_AT_NON_OPTION);
4001 if (quiet)
4002 perf_quiet_option();
4003
4004 err = symbol__validate_sym_arguments();
4005 if (err)
4006 return err;
4007
4008 perf_debuginfod_setup(&record.debuginfod);
4009
4010 /* Make system wide (-a) the default target. */
4011 if (!argc && target__none(&rec->opts.target))
4012 rec->opts.target.system_wide = true;
4013
4014 if (nr_cgroups && !rec->opts.target.system_wide) {
4015 usage_with_options_msg(record_usage, record_options,
4016 "cgroup monitoring only available in system-wide mode");
4017
4018 }
4019
4020 if (rec->buildid_mmap) {
4021 if (!perf_can_record_build_id()) {
4022 pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
4023 err = -EINVAL;
4024 goto out_opts;
4025 }
4026 pr_debug("Enabling build id in mmap2 events.\n");
4027 /* Enable mmap build id synthesizing. */
4028 symbol_conf.buildid_mmap2 = true;
4029 /* Enable perf_event_attr::build_id bit. */
4030 rec->opts.build_id = true;
4031 /* Disable build id cache. */
4032 rec->no_buildid = true;
4033 }
4034
4035 if (rec->opts.record_cgroup && !perf_can_record_cgroup()) {
4036 pr_err("Kernel has no cgroup sampling support.\n");
4037 err = -EINVAL;
4038 goto out_opts;
4039 }
4040
4041 if (rec->opts.kcore)
4042 rec->opts.text_poke = true;
4043
4044 if (rec->opts.kcore || record__threads_enabled(rec))
4045 rec->data.is_dir = true;
4046
4047 if (record__threads_enabled(rec)) {
4048 if (rec->opts.affinity != PERF_AFFINITY_SYS) {
4049 pr_err("--affinity option is mutually exclusive to parallel streaming mode.\n");
4050 goto out_opts;
4051 }
4052 if (record__aio_enabled(rec)) {
4053 pr_err("Asynchronous streaming mode (--aio) is mutually exclusive to parallel streaming mode.\n");
4054 goto out_opts;
4055 }
4056 }
4057
4058 if (rec->opts.comp_level != 0) {
4059 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
4060 rec->no_buildid = true;
4061 }
4062
4063 if (rec->opts.record_switch_events &&
4064 !perf_can_record_switch_events()) {
4065 ui__error("kernel does not support recording context switch events\n");
4066 parse_options_usage(record_usage, record_options, "switch-events", 0);
4067 err = -EINVAL;
4068 goto out_opts;
4069 }
4070
4071 if (switch_output_setup(rec)) {
4072 parse_options_usage(record_usage, record_options, "switch-output", 0);
4073 err = -EINVAL;
4074 goto out_opts;
4075 }
4076
4077 if (rec->switch_output.time) {
4078 signal(SIGALRM, alarm_sig_handler);
4079 alarm(rec->switch_output.time);
4080 }
4081
4082 if (rec->switch_output.num_files) {
4083 rec->switch_output.filenames = calloc(rec->switch_output.num_files,
4084 sizeof(char *));
4085 if (!rec->switch_output.filenames) {
4086 err = -EINVAL;
4087 goto out_opts;
4088 }
4089 }
4090
4091 if (rec->timestamp_filename && record__threads_enabled(rec)) {
4092 rec->timestamp_filename = false;
4093 pr_warning("WARNING: --timestamp-filename option is not available in parallel streaming mode.\n");
4094 }
4095
4096 /*
4097 * Allow aliases to facilitate the lookup of symbols for address
4098 * filters. Refer to auxtrace_parse_filters().
4099 */
4100 symbol_conf.allow_aliases = true;
4101
4102 symbol__init(NULL);
4103
4104 err = record__auxtrace_init(rec);
4105 if (err)
4106 goto out;
4107
4108 if (dry_run)
4109 goto out;
4110
4111 err = -ENOMEM;
4112
4113 if (rec->no_buildid_cache || rec->no_buildid) {
4114 disable_buildid_cache();
4115 } else if (rec->switch_output.enabled) {
4116 /*
4117 * In 'perf record --switch-output', disable buildid
4118 * generation by default to reduce data file switching
4119 * overhead. Still generate buildid if they are required
4120 * explicitly using
4121 *
4122 * perf record --switch-output --no-no-buildid \
4123 * --no-no-buildid-cache
4124 *
4125 * Following code equals to:
4126 *
4127 * if ((rec->no_buildid || !rec->no_buildid_set) &&
4128 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
4129 * disable_buildid_cache();
4130 */
4131 bool disable = true;
4132
4133 if (rec->no_buildid_set && !rec->no_buildid)
4134 disable = false;
4135 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
4136 disable = false;
4137 if (disable) {
4138 rec->no_buildid = true;
4139 rec->no_buildid_cache = true;
4140 disable_buildid_cache();
4141 }
4142 }
4143
4144 if (record.opts.overwrite)
4145 record.opts.tail_synthesize = true;
4146
4147 if (rec->evlist->core.nr_entries == 0) {
4148 bool can_profile_kernel = perf_event_paranoid_check(1);
4149
4150 err = parse_event(rec->evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
4151 if (err)
4152 goto out;
4153 }
4154
4155 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
4156 rec->opts.no_inherit = true;
4157
4158 err = target__validate(&rec->opts.target);
4159 if (err) {
4160 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
4161 ui__warning("%s\n", errbuf);
4162 }
4163
4164 err = target__parse_uid(&rec->opts.target);
4165 if (err) {
4166 int saved_errno = errno;
4167
4168 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
4169 ui__error("%s", errbuf);
4170
4171 err = -saved_errno;
4172 goto out;
4173 }
4174
4175 /* Enable ignoring missing threads when -u/-p option is defined. */
4176 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
4177
4178 evlist__warn_user_requested_cpus(rec->evlist, rec->opts.target.cpu_list);
4179
4180 if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP)
4181 arch__add_leaf_frame_record_opts(&rec->opts);
4182
4183 err = -ENOMEM;
4184 if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) {
4185 if (rec->opts.target.pid != NULL) {
4186 pr_err("Couldn't create thread/CPU maps: %s\n",
4187 errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
4188 goto out;
4189 }
4190 else
4191 usage_with_options(record_usage, record_options);
4192 }
4193
4194 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
4195 if (err)
4196 goto out;
4197
4198 /*
4199 * We take all buildids when the file contains
4200 * AUX area tracing data because we do not decode the
4201 * trace because it would take too long.
4202 */
4203 if (rec->opts.full_auxtrace)
4204 rec->buildid_all = true;
4205
4206 if (rec->opts.text_poke) {
4207 err = record__config_text_poke(rec->evlist);
4208 if (err) {
4209 pr_err("record__config_text_poke failed, error %d\n", err);
4210 goto out;
4211 }
4212 }
4213
4214 if (rec->off_cpu) {
4215 err = record__config_off_cpu(rec);
4216 if (err) {
4217 pr_err("record__config_off_cpu failed, error %d\n", err);
4218 goto out;
4219 }
4220 }
4221
4222 if (record_opts__config(&rec->opts)) {
4223 err = -EINVAL;
4224 goto out;
4225 }
4226
4227 err = record__config_tracking_events(rec);
4228 if (err) {
4229 pr_err("record__config_tracking_events failed, error %d\n", err);
4230 goto out;
4231 }
4232
4233 err = record__init_thread_masks(rec);
4234 if (err) {
4235 pr_err("Failed to initialize parallel data streaming masks\n");
4236 goto out;
4237 }
4238
4239 if (rec->opts.nr_cblocks > nr_cblocks_max)
4240 rec->opts.nr_cblocks = nr_cblocks_max;
4241 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
4242
4243 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
4244 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
4245
4246 if (rec->opts.comp_level > comp_level_max)
4247 rec->opts.comp_level = comp_level_max;
4248 pr_debug("comp level: %d\n", rec->opts.comp_level);
4249
4250 err = __cmd_record(&record, argc, argv);
4251out:
4252 evlist__delete(rec->evlist);
4253 symbol__exit();
4254 auxtrace_record__free(rec->itr);
4255out_opts:
4256 record__free_thread_masks(rec, rec->nr_threads);
4257 rec->nr_threads = 0;
4258 evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
4259 return err;
4260}
4261
4262static void snapshot_sig_handler(int sig __maybe_unused)
4263{
4264 struct record *rec = &record;
4265
4266 hit_auxtrace_snapshot_trigger(rec);
4267
4268 if (switch_output_signal(rec))
4269 trigger_hit(&switch_output_trigger);
4270}
4271
4272static void alarm_sig_handler(int sig __maybe_unused)
4273{
4274 struct record *rec = &record;
4275
4276 if (switch_output_time(rec))
4277 trigger_hit(&switch_output_trigger);
4278}