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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 <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__for_each_entry(evlist, pos) {
1359try_again:
1360 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
1361 if (evsel__fallback(pos, &opts->target, errno, msg, sizeof(msg))) {
1362 if (verbose > 0)
1363 ui__warning("%s\n", msg);
1364 goto try_again;
1365 }
1366 if ((errno == EINVAL || errno == EBADF) &&
1367 pos->core.leader != &pos->core &&
1368 pos->weak_group) {
1369 pos = evlist__reset_weak_group(evlist, pos, true);
1370 goto try_again;
1371 }
1372 rc = -errno;
1373 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
1374 ui__error("%s\n", msg);
1375 goto out;
1376 }
1377
1378 pos->supported = true;
1379 }
1380
1381 if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
1382 pr_warning(
1383"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
1384"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
1385"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
1386"file is not found in the buildid cache or in the vmlinux path.\n\n"
1387"Samples in kernel modules won't be resolved at all.\n\n"
1388"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1389"even with a suitable vmlinux or kallsyms file.\n\n");
1390 }
1391
1392 if (evlist__apply_filters(evlist, &pos)) {
1393 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
1394 pos->filter ?: "BPF", evsel__name(pos), errno,
1395 str_error_r(errno, msg, sizeof(msg)));
1396 rc = -1;
1397 goto out;
1398 }
1399
1400 rc = record__mmap(rec);
1401 if (rc)
1402 goto out;
1403
1404 session->evlist = evlist;
1405 perf_session__set_id_hdr_size(session);
1406out:
1407 return rc;
1408}
1409
1410static void set_timestamp_boundary(struct record *rec, u64 sample_time)
1411{
1412 if (rec->evlist->first_sample_time == 0)
1413 rec->evlist->first_sample_time = sample_time;
1414
1415 if (sample_time)
1416 rec->evlist->last_sample_time = sample_time;
1417}
1418
1419static int process_sample_event(struct perf_tool *tool,
1420 union perf_event *event,
1421 struct perf_sample *sample,
1422 struct evsel *evsel,
1423 struct machine *machine)
1424{
1425 struct record *rec = container_of(tool, struct record, tool);
1426
1427 set_timestamp_boundary(rec, sample->time);
1428
1429 if (rec->buildid_all)
1430 return 0;
1431
1432 rec->samples++;
1433 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
1434}
1435
1436static int process_buildids(struct record *rec)
1437{
1438 struct perf_session *session = rec->session;
1439
1440 if (perf_data__size(&rec->data) == 0)
1441 return 0;
1442
1443 /*
1444 * During this process, it'll load kernel map and replace the
1445 * dso->long_name to a real pathname it found. In this case
1446 * we prefer the vmlinux path like
1447 * /lib/modules/3.16.4/build/vmlinux
1448 *
1449 * rather than build-id path (in debug directory).
1450 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1451 */
1452 symbol_conf.ignore_vmlinux_buildid = true;
1453
1454 /*
1455 * If --buildid-all is given, it marks all DSO regardless of hits,
1456 * so no need to process samples. But if timestamp_boundary is enabled,
1457 * it still needs to walk on all samples to get the timestamps of
1458 * first/last samples.
1459 */
1460 if (rec->buildid_all && !rec->timestamp_boundary)
1461 rec->tool.sample = NULL;
1462
1463 return perf_session__process_events(session);
1464}
1465
1466static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1467{
1468 int err;
1469 struct perf_tool *tool = data;
1470 /*
1471 *As for guest kernel when processing subcommand record&report,
1472 *we arrange module mmap prior to guest kernel mmap and trigger
1473 *a preload dso because default guest module symbols are loaded
1474 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1475 *method is used to avoid symbol missing when the first addr is
1476 *in module instead of in guest kernel.
1477 */
1478 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1479 machine);
1480 if (err < 0)
1481 pr_err("Couldn't record guest kernel [%d]'s reference"
1482 " relocation symbol.\n", machine->pid);
1483
1484 /*
1485 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1486 * have no _text sometimes.
1487 */
1488 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1489 machine);
1490 if (err < 0)
1491 pr_err("Couldn't record guest kernel [%d]'s reference"
1492 " relocation symbol.\n", machine->pid);
1493}
1494
1495static struct perf_event_header finished_round_event = {
1496 .size = sizeof(struct perf_event_header),
1497 .type = PERF_RECORD_FINISHED_ROUND,
1498};
1499
1500static struct perf_event_header finished_init_event = {
1501 .size = sizeof(struct perf_event_header),
1502 .type = PERF_RECORD_FINISHED_INIT,
1503};
1504
1505static void record__adjust_affinity(struct record *rec, struct mmap *map)
1506{
1507 if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1508 !bitmap_equal(thread->mask->affinity.bits, map->affinity_mask.bits,
1509 thread->mask->affinity.nbits)) {
1510 bitmap_zero(thread->mask->affinity.bits, thread->mask->affinity.nbits);
1511 bitmap_or(thread->mask->affinity.bits, thread->mask->affinity.bits,
1512 map->affinity_mask.bits, thread->mask->affinity.nbits);
1513 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity),
1514 (cpu_set_t *)thread->mask->affinity.bits);
1515 if (verbose == 2) {
1516 pr_debug("threads[%d]: running on cpu%d: ", thread->tid, sched_getcpu());
1517 mmap_cpu_mask__scnprintf(&thread->mask->affinity, "affinity");
1518 }
1519 }
1520}
1521
1522static size_t process_comp_header(void *record, size_t increment)
1523{
1524 struct perf_record_compressed *event = record;
1525 size_t size = sizeof(*event);
1526
1527 if (increment) {
1528 event->header.size += increment;
1529 return increment;
1530 }
1531
1532 event->header.type = PERF_RECORD_COMPRESSED;
1533 event->header.size = size;
1534
1535 return size;
1536}
1537
1538static ssize_t zstd_compress(struct perf_session *session, struct mmap *map,
1539 void *dst, size_t dst_size, void *src, size_t src_size)
1540{
1541 ssize_t compressed;
1542 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1543 struct zstd_data *zstd_data = &session->zstd_data;
1544
1545 if (map && map->file)
1546 zstd_data = &map->zstd_data;
1547
1548 compressed = zstd_compress_stream_to_records(zstd_data, dst, dst_size, src, src_size,
1549 max_record_size, process_comp_header);
1550 if (compressed < 0)
1551 return compressed;
1552
1553 if (map && map->file) {
1554 thread->bytes_transferred += src_size;
1555 thread->bytes_compressed += compressed;
1556 } else {
1557 session->bytes_transferred += src_size;
1558 session->bytes_compressed += compressed;
1559 }
1560
1561 return compressed;
1562}
1563
1564static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1565 bool overwrite, bool synch)
1566{
1567 u64 bytes_written = rec->bytes_written;
1568 int i;
1569 int rc = 0;
1570 int nr_mmaps;
1571 struct mmap **maps;
1572 int trace_fd = rec->data.file.fd;
1573 off_t off = 0;
1574
1575 if (!evlist)
1576 return 0;
1577
1578 nr_mmaps = thread->nr_mmaps;
1579 maps = overwrite ? thread->overwrite_maps : thread->maps;
1580
1581 if (!maps)
1582 return 0;
1583
1584 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1585 return 0;
1586
1587 if (record__aio_enabled(rec))
1588 off = record__aio_get_pos(trace_fd);
1589
1590 for (i = 0; i < nr_mmaps; i++) {
1591 u64 flush = 0;
1592 struct mmap *map = maps[i];
1593
1594 if (map->core.base) {
1595 record__adjust_affinity(rec, map);
1596 if (synch) {
1597 flush = map->core.flush;
1598 map->core.flush = 1;
1599 }
1600 if (!record__aio_enabled(rec)) {
1601 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1602 if (synch)
1603 map->core.flush = flush;
1604 rc = -1;
1605 goto out;
1606 }
1607 } else {
1608 if (record__aio_push(rec, map, &off) < 0) {
1609 record__aio_set_pos(trace_fd, off);
1610 if (synch)
1611 map->core.flush = flush;
1612 rc = -1;
1613 goto out;
1614 }
1615 }
1616 if (synch)
1617 map->core.flush = flush;
1618 }
1619
1620 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1621 !rec->opts.auxtrace_sample_mode &&
1622 record__auxtrace_mmap_read(rec, map) != 0) {
1623 rc = -1;
1624 goto out;
1625 }
1626 }
1627
1628 if (record__aio_enabled(rec))
1629 record__aio_set_pos(trace_fd, off);
1630
1631 /*
1632 * Mark the round finished in case we wrote
1633 * at least one event.
1634 *
1635 * No need for round events in directory mode,
1636 * because per-cpu maps and files have data
1637 * sorted by kernel.
1638 */
1639 if (!record__threads_enabled(rec) && bytes_written != rec->bytes_written)
1640 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1641
1642 if (overwrite)
1643 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1644out:
1645 return rc;
1646}
1647
1648static int record__mmap_read_all(struct record *rec, bool synch)
1649{
1650 int err;
1651
1652 err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1653 if (err)
1654 return err;
1655
1656 return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1657}
1658
1659static void record__thread_munmap_filtered(struct fdarray *fda, int fd,
1660 void *arg __maybe_unused)
1661{
1662 struct perf_mmap *map = fda->priv[fd].ptr;
1663
1664 if (map)
1665 perf_mmap__put(map);
1666}
1667
1668static void *record__thread(void *arg)
1669{
1670 enum thread_msg msg = THREAD_MSG__READY;
1671 bool terminate = false;
1672 struct fdarray *pollfd;
1673 int err, ctlfd_pos;
1674
1675 thread = arg;
1676 thread->tid = gettid();
1677
1678 err = write(thread->pipes.ack[1], &msg, sizeof(msg));
1679 if (err == -1)
1680 pr_warning("threads[%d]: failed to notify on start: %s\n",
1681 thread->tid, strerror(errno));
1682
1683 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
1684
1685 pollfd = &thread->pollfd;
1686 ctlfd_pos = thread->ctlfd_pos;
1687
1688 for (;;) {
1689 unsigned long long hits = thread->samples;
1690
1691 if (record__mmap_read_all(thread->rec, false) < 0 || terminate)
1692 break;
1693
1694 if (hits == thread->samples) {
1695
1696 err = fdarray__poll(pollfd, -1);
1697 /*
1698 * Propagate error, only if there's any. Ignore positive
1699 * number of returned events and interrupt error.
1700 */
1701 if (err > 0 || (err < 0 && errno == EINTR))
1702 err = 0;
1703 thread->waking++;
1704
1705 if (fdarray__filter(pollfd, POLLERR | POLLHUP,
1706 record__thread_munmap_filtered, NULL) == 0)
1707 break;
1708 }
1709
1710 if (pollfd->entries[ctlfd_pos].revents & POLLHUP) {
1711 terminate = true;
1712 close(thread->pipes.msg[0]);
1713 thread->pipes.msg[0] = -1;
1714 pollfd->entries[ctlfd_pos].fd = -1;
1715 pollfd->entries[ctlfd_pos].events = 0;
1716 }
1717
1718 pollfd->entries[ctlfd_pos].revents = 0;
1719 }
1720 record__mmap_read_all(thread->rec, true);
1721
1722 err = write(thread->pipes.ack[1], &msg, sizeof(msg));
1723 if (err == -1)
1724 pr_warning("threads[%d]: failed to notify on termination: %s\n",
1725 thread->tid, strerror(errno));
1726
1727 return NULL;
1728}
1729
1730static void record__init_features(struct record *rec)
1731{
1732 struct perf_session *session = rec->session;
1733 int feat;
1734
1735 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1736 perf_header__set_feat(&session->header, feat);
1737
1738 if (rec->no_buildid)
1739 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1740
1741#ifdef HAVE_LIBTRACEEVENT
1742 if (!have_tracepoints(&rec->evlist->core.entries))
1743 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1744#endif
1745
1746 if (!rec->opts.branch_stack)
1747 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1748
1749 if (!rec->opts.full_auxtrace)
1750 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1751
1752 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1753 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1754
1755 if (!rec->opts.use_clockid)
1756 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1757
1758 if (!record__threads_enabled(rec))
1759 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1760
1761 if (!record__comp_enabled(rec))
1762 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1763
1764 perf_header__clear_feat(&session->header, HEADER_STAT);
1765}
1766
1767static void
1768record__finish_output(struct record *rec)
1769{
1770 int i;
1771 struct perf_data *data = &rec->data;
1772 int fd = perf_data__fd(data);
1773
1774 if (data->is_pipe) {
1775 /* Just to display approx. size */
1776 data->file.size = rec->bytes_written;
1777 return;
1778 }
1779
1780 rec->session->header.data_size += rec->bytes_written;
1781 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1782 if (record__threads_enabled(rec)) {
1783 for (i = 0; i < data->dir.nr; i++)
1784 data->dir.files[i].size = lseek(data->dir.files[i].fd, 0, SEEK_CUR);
1785 }
1786
1787 if (!rec->no_buildid) {
1788 process_buildids(rec);
1789
1790 if (rec->buildid_all)
1791 dsos__hit_all(rec->session);
1792 }
1793 perf_session__write_header(rec->session, rec->evlist, fd, true);
1794
1795 return;
1796}
1797
1798static int record__synthesize_workload(struct record *rec, bool tail)
1799{
1800 int err;
1801 struct perf_thread_map *thread_map;
1802 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP;
1803
1804 if (rec->opts.tail_synthesize != tail)
1805 return 0;
1806
1807 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1808 if (thread_map == NULL)
1809 return -1;
1810
1811 err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1812 process_synthesized_event,
1813 &rec->session->machines.host,
1814 needs_mmap,
1815 rec->opts.sample_address);
1816 perf_thread_map__put(thread_map);
1817 return err;
1818}
1819
1820static int write_finished_init(struct record *rec, bool tail)
1821{
1822 if (rec->opts.tail_synthesize != tail)
1823 return 0;
1824
1825 return record__write(rec, NULL, &finished_init_event, sizeof(finished_init_event));
1826}
1827
1828static int record__synthesize(struct record *rec, bool tail);
1829
1830static int
1831record__switch_output(struct record *rec, bool at_exit)
1832{
1833 struct perf_data *data = &rec->data;
1834 char *new_filename = NULL;
1835 int fd, err;
1836
1837 /* Same Size: "2015122520103046"*/
1838 char timestamp[] = "InvalidTimestamp";
1839
1840 record__aio_mmap_read_sync(rec);
1841
1842 write_finished_init(rec, true);
1843
1844 record__synthesize(rec, true);
1845 if (target__none(&rec->opts.target))
1846 record__synthesize_workload(rec, true);
1847
1848 rec->samples = 0;
1849 record__finish_output(rec);
1850 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1851 if (err) {
1852 pr_err("Failed to get current timestamp\n");
1853 return -EINVAL;
1854 }
1855
1856 fd = perf_data__switch(data, timestamp,
1857 rec->session->header.data_offset,
1858 at_exit, &new_filename);
1859 if (fd >= 0 && !at_exit) {
1860 rec->bytes_written = 0;
1861 rec->session->header.data_size = 0;
1862 }
1863
1864 if (!quiet) {
1865 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1866 data->path, timestamp);
1867 }
1868
1869 if (rec->switch_output.num_files) {
1870 int n = rec->switch_output.cur_file + 1;
1871
1872 if (n >= rec->switch_output.num_files)
1873 n = 0;
1874 rec->switch_output.cur_file = n;
1875 if (rec->switch_output.filenames[n]) {
1876 remove(rec->switch_output.filenames[n]);
1877 zfree(&rec->switch_output.filenames[n]);
1878 }
1879 rec->switch_output.filenames[n] = new_filename;
1880 } else {
1881 free(new_filename);
1882 }
1883
1884 /* Output tracking events */
1885 if (!at_exit) {
1886 record__synthesize(rec, false);
1887
1888 /*
1889 * In 'perf record --switch-output' without -a,
1890 * record__synthesize() in record__switch_output() won't
1891 * generate tracking events because there's no thread_map
1892 * in evlist. Which causes newly created perf.data doesn't
1893 * contain map and comm information.
1894 * Create a fake thread_map and directly call
1895 * perf_event__synthesize_thread_map() for those events.
1896 */
1897 if (target__none(&rec->opts.target))
1898 record__synthesize_workload(rec, false);
1899 write_finished_init(rec, false);
1900 }
1901 return fd;
1902}
1903
1904static void __record__save_lost_samples(struct record *rec, struct evsel *evsel,
1905 struct perf_record_lost_samples *lost,
1906 int cpu_idx, int thread_idx, u64 lost_count,
1907 u16 misc_flag)
1908{
1909 struct perf_sample_id *sid;
1910 struct perf_sample sample = {};
1911 int id_hdr_size;
1912
1913 lost->lost = lost_count;
1914 if (evsel->core.ids) {
1915 sid = xyarray__entry(evsel->core.sample_id, cpu_idx, thread_idx);
1916 sample.id = sid->id;
1917 }
1918
1919 id_hdr_size = perf_event__synthesize_id_sample((void *)(lost + 1),
1920 evsel->core.attr.sample_type, &sample);
1921 lost->header.size = sizeof(*lost) + id_hdr_size;
1922 lost->header.misc = misc_flag;
1923 record__write(rec, NULL, lost, lost->header.size);
1924}
1925
1926static void record__read_lost_samples(struct record *rec)
1927{
1928 struct perf_session *session = rec->session;
1929 struct perf_record_lost_samples *lost = NULL;
1930 struct evsel *evsel;
1931
1932 /* there was an error during record__open */
1933 if (session->evlist == NULL)
1934 return;
1935
1936 evlist__for_each_entry(session->evlist, evsel) {
1937 struct xyarray *xy = evsel->core.sample_id;
1938 u64 lost_count;
1939
1940 if (xy == NULL || evsel->core.fd == NULL)
1941 continue;
1942 if (xyarray__max_x(evsel->core.fd) != xyarray__max_x(xy) ||
1943 xyarray__max_y(evsel->core.fd) != xyarray__max_y(xy)) {
1944 pr_debug("Unmatched FD vs. sample ID: skip reading LOST count\n");
1945 continue;
1946 }
1947
1948 for (int x = 0; x < xyarray__max_x(xy); x++) {
1949 for (int y = 0; y < xyarray__max_y(xy); y++) {
1950 struct perf_counts_values count;
1951
1952 if (perf_evsel__read(&evsel->core, x, y, &count) < 0) {
1953 pr_debug("read LOST count failed\n");
1954 goto out;
1955 }
1956
1957 if (count.lost) {
1958 if (!lost) {
1959 lost = zalloc(sizeof(*lost) +
1960 session->machines.host.id_hdr_size);
1961 if (!lost) {
1962 pr_debug("Memory allocation failed\n");
1963 return;
1964 }
1965 lost->header.type = PERF_RECORD_LOST_SAMPLES;
1966 }
1967 __record__save_lost_samples(rec, evsel, lost,
1968 x, y, count.lost, 0);
1969 }
1970 }
1971 }
1972
1973 lost_count = perf_bpf_filter__lost_count(evsel);
1974 if (lost_count) {
1975 if (!lost) {
1976 lost = zalloc(sizeof(*lost) +
1977 session->machines.host.id_hdr_size);
1978 if (!lost) {
1979 pr_debug("Memory allocation failed\n");
1980 return;
1981 }
1982 lost->header.type = PERF_RECORD_LOST_SAMPLES;
1983 }
1984 __record__save_lost_samples(rec, evsel, lost, 0, 0, lost_count,
1985 PERF_RECORD_MISC_LOST_SAMPLES_BPF);
1986 }
1987 }
1988out:
1989 free(lost);
1990}
1991
1992static volatile sig_atomic_t workload_exec_errno;
1993
1994/*
1995 * evlist__prepare_workload will send a SIGUSR1
1996 * if the fork fails, since we asked by setting its
1997 * want_signal to true.
1998 */
1999static void workload_exec_failed_signal(int signo __maybe_unused,
2000 siginfo_t *info,
2001 void *ucontext __maybe_unused)
2002{
2003 workload_exec_errno = info->si_value.sival_int;
2004 done = 1;
2005 child_finished = 1;
2006}
2007
2008static void snapshot_sig_handler(int sig);
2009static void alarm_sig_handler(int sig);
2010
2011static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist)
2012{
2013 if (evlist) {
2014 if (evlist->mmap && evlist->mmap[0].core.base)
2015 return evlist->mmap[0].core.base;
2016 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
2017 return evlist->overwrite_mmap[0].core.base;
2018 }
2019 return NULL;
2020}
2021
2022static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
2023{
2024 const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist);
2025 if (pc)
2026 return pc;
2027 return NULL;
2028}
2029
2030static int record__synthesize(struct record *rec, bool tail)
2031{
2032 struct perf_session *session = rec->session;
2033 struct machine *machine = &session->machines.host;
2034 struct perf_data *data = &rec->data;
2035 struct record_opts *opts = &rec->opts;
2036 struct perf_tool *tool = &rec->tool;
2037 int err = 0;
2038 event_op f = process_synthesized_event;
2039
2040 if (rec->opts.tail_synthesize != tail)
2041 return 0;
2042
2043 if (data->is_pipe) {
2044 err = perf_event__synthesize_for_pipe(tool, session, data,
2045 process_synthesized_event);
2046 if (err < 0)
2047 goto out;
2048
2049 rec->bytes_written += err;
2050 }
2051
2052 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
2053 process_synthesized_event, machine);
2054 if (err)
2055 goto out;
2056
2057 /* Synthesize id_index before auxtrace_info */
2058 err = perf_event__synthesize_id_index(tool,
2059 process_synthesized_event,
2060 session->evlist, machine);
2061 if (err)
2062 goto out;
2063
2064 if (rec->opts.full_auxtrace) {
2065 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
2066 session, process_synthesized_event);
2067 if (err)
2068 goto out;
2069 }
2070
2071 if (!evlist__exclude_kernel(rec->evlist)) {
2072 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
2073 machine);
2074 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
2075 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
2076 "Check /proc/kallsyms permission or run as root.\n");
2077
2078 err = perf_event__synthesize_modules(tool, process_synthesized_event,
2079 machine);
2080 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
2081 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
2082 "Check /proc/modules permission or run as root.\n");
2083 }
2084
2085 if (perf_guest) {
2086 machines__process_guests(&session->machines,
2087 perf_event__synthesize_guest_os, tool);
2088 }
2089
2090 err = perf_event__synthesize_extra_attr(&rec->tool,
2091 rec->evlist,
2092 process_synthesized_event,
2093 data->is_pipe);
2094 if (err)
2095 goto out;
2096
2097 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
2098 process_synthesized_event,
2099 NULL);
2100 if (err < 0) {
2101 pr_err("Couldn't synthesize thread map.\n");
2102 return err;
2103 }
2104
2105 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.all_cpus,
2106 process_synthesized_event, NULL);
2107 if (err < 0) {
2108 pr_err("Couldn't synthesize cpu map.\n");
2109 return err;
2110 }
2111
2112 err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
2113 machine, opts);
2114 if (err < 0) {
2115 pr_warning("Couldn't synthesize bpf events.\n");
2116 err = 0;
2117 }
2118
2119 if (rec->opts.synth & PERF_SYNTH_CGROUP) {
2120 err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
2121 machine);
2122 if (err < 0) {
2123 pr_warning("Couldn't synthesize cgroup events.\n");
2124 err = 0;
2125 }
2126 }
2127
2128 if (rec->opts.nr_threads_synthesize > 1) {
2129 mutex_init(&synth_lock);
2130 perf_set_multithreaded();
2131 f = process_locked_synthesized_event;
2132 }
2133
2134 if (rec->opts.synth & PERF_SYNTH_TASK) {
2135 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP;
2136
2137 err = __machine__synthesize_threads(machine, tool, &opts->target,
2138 rec->evlist->core.threads,
2139 f, needs_mmap, opts->sample_address,
2140 rec->opts.nr_threads_synthesize);
2141 }
2142
2143 if (rec->opts.nr_threads_synthesize > 1) {
2144 perf_set_singlethreaded();
2145 mutex_destroy(&synth_lock);
2146 }
2147
2148out:
2149 return err;
2150}
2151
2152static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
2153{
2154 struct record *rec = data;
2155 pthread_kill(rec->thread_id, SIGUSR2);
2156 return 0;
2157}
2158
2159static int record__setup_sb_evlist(struct record *rec)
2160{
2161 struct record_opts *opts = &rec->opts;
2162
2163 if (rec->sb_evlist != NULL) {
2164 /*
2165 * We get here if --switch-output-event populated the
2166 * sb_evlist, so associate a callback that will send a SIGUSR2
2167 * to the main thread.
2168 */
2169 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
2170 rec->thread_id = pthread_self();
2171 }
2172#ifdef HAVE_LIBBPF_SUPPORT
2173 if (!opts->no_bpf_event) {
2174 if (rec->sb_evlist == NULL) {
2175 rec->sb_evlist = evlist__new();
2176
2177 if (rec->sb_evlist == NULL) {
2178 pr_err("Couldn't create side band evlist.\n.");
2179 return -1;
2180 }
2181 }
2182
2183 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
2184 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
2185 return -1;
2186 }
2187 }
2188#endif
2189 if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
2190 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
2191 opts->no_bpf_event = true;
2192 }
2193
2194 return 0;
2195}
2196
2197static int record__init_clock(struct record *rec)
2198{
2199 struct perf_session *session = rec->session;
2200 struct timespec ref_clockid;
2201 struct timeval ref_tod;
2202 u64 ref;
2203
2204 if (!rec->opts.use_clockid)
2205 return 0;
2206
2207 if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
2208 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
2209
2210 session->header.env.clock.clockid = rec->opts.clockid;
2211
2212 if (gettimeofday(&ref_tod, NULL) != 0) {
2213 pr_err("gettimeofday failed, cannot set reference time.\n");
2214 return -1;
2215 }
2216
2217 if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
2218 pr_err("clock_gettime failed, cannot set reference time.\n");
2219 return -1;
2220 }
2221
2222 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
2223 (u64) ref_tod.tv_usec * NSEC_PER_USEC;
2224
2225 session->header.env.clock.tod_ns = ref;
2226
2227 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
2228 (u64) ref_clockid.tv_nsec;
2229
2230 session->header.env.clock.clockid_ns = ref;
2231 return 0;
2232}
2233
2234static void hit_auxtrace_snapshot_trigger(struct record *rec)
2235{
2236 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
2237 trigger_hit(&auxtrace_snapshot_trigger);
2238 auxtrace_record__snapshot_started = 1;
2239 if (auxtrace_record__snapshot_start(rec->itr))
2240 trigger_error(&auxtrace_snapshot_trigger);
2241 }
2242}
2243
2244static int record__terminate_thread(struct record_thread *thread_data)
2245{
2246 int err;
2247 enum thread_msg ack = THREAD_MSG__UNDEFINED;
2248 pid_t tid = thread_data->tid;
2249
2250 close(thread_data->pipes.msg[1]);
2251 thread_data->pipes.msg[1] = -1;
2252 err = read(thread_data->pipes.ack[0], &ack, sizeof(ack));
2253 if (err > 0)
2254 pr_debug2("threads[%d]: sent %s\n", tid, thread_msg_tags[ack]);
2255 else
2256 pr_warning("threads[%d]: failed to receive termination notification from %d\n",
2257 thread->tid, tid);
2258
2259 return 0;
2260}
2261
2262static int record__start_threads(struct record *rec)
2263{
2264 int t, tt, err, ret = 0, nr_threads = rec->nr_threads;
2265 struct record_thread *thread_data = rec->thread_data;
2266 sigset_t full, mask;
2267 pthread_t handle;
2268 pthread_attr_t attrs;
2269
2270 thread = &thread_data[0];
2271
2272 if (!record__threads_enabled(rec))
2273 return 0;
2274
2275 sigfillset(&full);
2276 if (sigprocmask(SIG_SETMASK, &full, &mask)) {
2277 pr_err("Failed to block signals on threads start: %s\n", strerror(errno));
2278 return -1;
2279 }
2280
2281 pthread_attr_init(&attrs);
2282 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
2283
2284 for (t = 1; t < nr_threads; t++) {
2285 enum thread_msg msg = THREAD_MSG__UNDEFINED;
2286
2287#ifdef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
2288 pthread_attr_setaffinity_np(&attrs,
2289 MMAP_CPU_MASK_BYTES(&(thread_data[t].mask->affinity)),
2290 (cpu_set_t *)(thread_data[t].mask->affinity.bits));
2291#endif
2292 if (pthread_create(&handle, &attrs, record__thread, &thread_data[t])) {
2293 for (tt = 1; tt < t; tt++)
2294 record__terminate_thread(&thread_data[t]);
2295 pr_err("Failed to start threads: %s\n", strerror(errno));
2296 ret = -1;
2297 goto out_err;
2298 }
2299
2300 err = read(thread_data[t].pipes.ack[0], &msg, sizeof(msg));
2301 if (err > 0)
2302 pr_debug2("threads[%d]: sent %s\n", rec->thread_data[t].tid,
2303 thread_msg_tags[msg]);
2304 else
2305 pr_warning("threads[%d]: failed to receive start notification from %d\n",
2306 thread->tid, rec->thread_data[t].tid);
2307 }
2308
2309 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity),
2310 (cpu_set_t *)thread->mask->affinity.bits);
2311
2312 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
2313
2314out_err:
2315 pthread_attr_destroy(&attrs);
2316
2317 if (sigprocmask(SIG_SETMASK, &mask, NULL)) {
2318 pr_err("Failed to unblock signals on threads start: %s\n", strerror(errno));
2319 ret = -1;
2320 }
2321
2322 return ret;
2323}
2324
2325static int record__stop_threads(struct record *rec)
2326{
2327 int t;
2328 struct record_thread *thread_data = rec->thread_data;
2329
2330 for (t = 1; t < rec->nr_threads; t++)
2331 record__terminate_thread(&thread_data[t]);
2332
2333 for (t = 0; t < rec->nr_threads; t++) {
2334 rec->samples += thread_data[t].samples;
2335 if (!record__threads_enabled(rec))
2336 continue;
2337 rec->session->bytes_transferred += thread_data[t].bytes_transferred;
2338 rec->session->bytes_compressed += thread_data[t].bytes_compressed;
2339 pr_debug("threads[%d]: samples=%lld, wakes=%ld, ", thread_data[t].tid,
2340 thread_data[t].samples, thread_data[t].waking);
2341 if (thread_data[t].bytes_transferred && thread_data[t].bytes_compressed)
2342 pr_debug("transferred=%" PRIu64 ", compressed=%" PRIu64 "\n",
2343 thread_data[t].bytes_transferred, thread_data[t].bytes_compressed);
2344 else
2345 pr_debug("written=%" PRIu64 "\n", thread_data[t].bytes_written);
2346 }
2347
2348 return 0;
2349}
2350
2351static unsigned long record__waking(struct record *rec)
2352{
2353 int t;
2354 unsigned long waking = 0;
2355 struct record_thread *thread_data = rec->thread_data;
2356
2357 for (t = 0; t < rec->nr_threads; t++)
2358 waking += thread_data[t].waking;
2359
2360 return waking;
2361}
2362
2363static int __cmd_record(struct record *rec, int argc, const char **argv)
2364{
2365 int err;
2366 int status = 0;
2367 const bool forks = argc > 0;
2368 struct perf_tool *tool = &rec->tool;
2369 struct record_opts *opts = &rec->opts;
2370 struct perf_data *data = &rec->data;
2371 struct perf_session *session;
2372 bool disabled = false, draining = false;
2373 int fd;
2374 float ratio = 0;
2375 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
2376
2377 atexit(record__sig_exit);
2378 signal(SIGCHLD, sig_handler);
2379 signal(SIGINT, sig_handler);
2380 signal(SIGTERM, sig_handler);
2381 signal(SIGSEGV, sigsegv_handler);
2382
2383 if (rec->opts.record_namespaces)
2384 tool->namespace_events = true;
2385
2386 if (rec->opts.record_cgroup) {
2387#ifdef HAVE_FILE_HANDLE
2388 tool->cgroup_events = true;
2389#else
2390 pr_err("cgroup tracking is not supported\n");
2391 return -1;
2392#endif
2393 }
2394
2395 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
2396 signal(SIGUSR2, snapshot_sig_handler);
2397 if (rec->opts.auxtrace_snapshot_mode)
2398 trigger_on(&auxtrace_snapshot_trigger);
2399 if (rec->switch_output.enabled)
2400 trigger_on(&switch_output_trigger);
2401 } else {
2402 signal(SIGUSR2, SIG_IGN);
2403 }
2404
2405 session = perf_session__new(data, tool);
2406 if (IS_ERR(session)) {
2407 pr_err("Perf session creation failed.\n");
2408 return PTR_ERR(session);
2409 }
2410
2411 if (record__threads_enabled(rec)) {
2412 if (perf_data__is_pipe(&rec->data)) {
2413 pr_err("Parallel trace streaming is not available in pipe mode.\n");
2414 return -1;
2415 }
2416 if (rec->opts.full_auxtrace) {
2417 pr_err("Parallel trace streaming is not available in AUX area tracing mode.\n");
2418 return -1;
2419 }
2420 }
2421
2422 fd = perf_data__fd(data);
2423 rec->session = session;
2424
2425 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
2426 pr_err("Compression initialization failed.\n");
2427 return -1;
2428 }
2429#ifdef HAVE_EVENTFD_SUPPORT
2430 done_fd = eventfd(0, EFD_NONBLOCK);
2431 if (done_fd < 0) {
2432 pr_err("Failed to create wakeup eventfd, error: %m\n");
2433 status = -1;
2434 goto out_delete_session;
2435 }
2436 err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
2437 if (err < 0) {
2438 pr_err("Failed to add wakeup eventfd to poll list\n");
2439 status = err;
2440 goto out_delete_session;
2441 }
2442#endif // HAVE_EVENTFD_SUPPORT
2443
2444 session->header.env.comp_type = PERF_COMP_ZSTD;
2445 session->header.env.comp_level = rec->opts.comp_level;
2446
2447 if (rec->opts.kcore &&
2448 !record__kcore_readable(&session->machines.host)) {
2449 pr_err("ERROR: kcore is not readable.\n");
2450 return -1;
2451 }
2452
2453 if (record__init_clock(rec))
2454 return -1;
2455
2456 record__init_features(rec);
2457
2458 if (forks) {
2459 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
2460 workload_exec_failed_signal);
2461 if (err < 0) {
2462 pr_err("Couldn't run the workload!\n");
2463 status = err;
2464 goto out_delete_session;
2465 }
2466 }
2467
2468 /*
2469 * If we have just single event and are sending data
2470 * through pipe, we need to force the ids allocation,
2471 * because we synthesize event name through the pipe
2472 * and need the id for that.
2473 */
2474 if (data->is_pipe && rec->evlist->core.nr_entries == 1)
2475 rec->opts.sample_id = true;
2476
2477 if (rec->timestamp_filename && perf_data__is_pipe(data)) {
2478 rec->timestamp_filename = false;
2479 pr_warning("WARNING: --timestamp-filename option is not available in pipe mode.\n");
2480 }
2481
2482 evlist__uniquify_name(rec->evlist);
2483
2484 evlist__config(rec->evlist, opts, &callchain_param);
2485
2486 /* Debug message used by test scripts */
2487 pr_debug3("perf record opening and mmapping events\n");
2488 if (record__open(rec) != 0) {
2489 err = -1;
2490 goto out_free_threads;
2491 }
2492 /* Debug message used by test scripts */
2493 pr_debug3("perf record done opening and mmapping events\n");
2494 session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
2495
2496 if (rec->opts.kcore) {
2497 err = record__kcore_copy(&session->machines.host, data);
2498 if (err) {
2499 pr_err("ERROR: Failed to copy kcore\n");
2500 goto out_free_threads;
2501 }
2502 }
2503
2504 /*
2505 * Normally perf_session__new would do this, but it doesn't have the
2506 * evlist.
2507 */
2508 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
2509 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
2510 rec->tool.ordered_events = false;
2511 }
2512
2513 if (evlist__nr_groups(rec->evlist) == 0)
2514 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
2515
2516 if (data->is_pipe) {
2517 err = perf_header__write_pipe(fd);
2518 if (err < 0)
2519 goto out_free_threads;
2520 } else {
2521 err = perf_session__write_header(session, rec->evlist, fd, false);
2522 if (err < 0)
2523 goto out_free_threads;
2524 }
2525
2526 err = -1;
2527 if (!rec->no_buildid
2528 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
2529 pr_err("Couldn't generate buildids. "
2530 "Use --no-buildid to profile anyway.\n");
2531 goto out_free_threads;
2532 }
2533
2534 err = record__setup_sb_evlist(rec);
2535 if (err)
2536 goto out_free_threads;
2537
2538 err = record__synthesize(rec, false);
2539 if (err < 0)
2540 goto out_free_threads;
2541
2542 if (rec->realtime_prio) {
2543 struct sched_param param;
2544
2545 param.sched_priority = rec->realtime_prio;
2546 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
2547 pr_err("Could not set realtime priority.\n");
2548 err = -1;
2549 goto out_free_threads;
2550 }
2551 }
2552
2553 if (record__start_threads(rec))
2554 goto out_free_threads;
2555
2556 /*
2557 * When perf is starting the traced process, all the events
2558 * (apart from group members) have enable_on_exec=1 set,
2559 * so don't spoil it by prematurely enabling them.
2560 */
2561 if (!target__none(&opts->target) && !opts->target.initial_delay)
2562 evlist__enable(rec->evlist);
2563
2564 /*
2565 * Let the child rip
2566 */
2567 if (forks) {
2568 struct machine *machine = &session->machines.host;
2569 union perf_event *event;
2570 pid_t tgid;
2571
2572 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
2573 if (event == NULL) {
2574 err = -ENOMEM;
2575 goto out_child;
2576 }
2577
2578 /*
2579 * Some H/W events are generated before COMM event
2580 * which is emitted during exec(), so perf script
2581 * cannot see a correct process name for those events.
2582 * Synthesize COMM event to prevent it.
2583 */
2584 tgid = perf_event__synthesize_comm(tool, event,
2585 rec->evlist->workload.pid,
2586 process_synthesized_event,
2587 machine);
2588 free(event);
2589
2590 if (tgid == -1)
2591 goto out_child;
2592
2593 event = malloc(sizeof(event->namespaces) +
2594 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
2595 machine->id_hdr_size);
2596 if (event == NULL) {
2597 err = -ENOMEM;
2598 goto out_child;
2599 }
2600
2601 /*
2602 * Synthesize NAMESPACES event for the command specified.
2603 */
2604 perf_event__synthesize_namespaces(tool, event,
2605 rec->evlist->workload.pid,
2606 tgid, process_synthesized_event,
2607 machine);
2608 free(event);
2609
2610 evlist__start_workload(rec->evlist);
2611 }
2612
2613 if (opts->target.initial_delay) {
2614 pr_info(EVLIST_DISABLED_MSG);
2615 if (opts->target.initial_delay > 0) {
2616 usleep(opts->target.initial_delay * USEC_PER_MSEC);
2617 evlist__enable(rec->evlist);
2618 pr_info(EVLIST_ENABLED_MSG);
2619 }
2620 }
2621
2622 err = event_enable_timer__start(rec->evlist->eet);
2623 if (err)
2624 goto out_child;
2625
2626 /* Debug message used by test scripts */
2627 pr_debug3("perf record has started\n");
2628 fflush(stderr);
2629
2630 trigger_ready(&auxtrace_snapshot_trigger);
2631 trigger_ready(&switch_output_trigger);
2632 perf_hooks__invoke_record_start();
2633
2634 /*
2635 * Must write FINISHED_INIT so it will be seen after all other
2636 * synthesized user events, but before any regular events.
2637 */
2638 err = write_finished_init(rec, false);
2639 if (err < 0)
2640 goto out_child;
2641
2642 for (;;) {
2643 unsigned long long hits = thread->samples;
2644
2645 /*
2646 * rec->evlist->bkw_mmap_state is possible to be
2647 * BKW_MMAP_EMPTY here: when done == true and
2648 * hits != rec->samples in previous round.
2649 *
2650 * evlist__toggle_bkw_mmap ensure we never
2651 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
2652 */
2653 if (trigger_is_hit(&switch_output_trigger) || done || draining)
2654 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
2655
2656 if (record__mmap_read_all(rec, false) < 0) {
2657 trigger_error(&auxtrace_snapshot_trigger);
2658 trigger_error(&switch_output_trigger);
2659 err = -1;
2660 goto out_child;
2661 }
2662
2663 if (auxtrace_record__snapshot_started) {
2664 auxtrace_record__snapshot_started = 0;
2665 if (!trigger_is_error(&auxtrace_snapshot_trigger))
2666 record__read_auxtrace_snapshot(rec, false);
2667 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
2668 pr_err("AUX area tracing snapshot failed\n");
2669 err = -1;
2670 goto out_child;
2671 }
2672 }
2673
2674 if (trigger_is_hit(&switch_output_trigger)) {
2675 /*
2676 * If switch_output_trigger is hit, the data in
2677 * overwritable ring buffer should have been collected,
2678 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
2679 *
2680 * If SIGUSR2 raise after or during record__mmap_read_all(),
2681 * record__mmap_read_all() didn't collect data from
2682 * overwritable ring buffer. Read again.
2683 */
2684 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
2685 continue;
2686 trigger_ready(&switch_output_trigger);
2687
2688 /*
2689 * Reenable events in overwrite ring buffer after
2690 * record__mmap_read_all(): we should have collected
2691 * data from it.
2692 */
2693 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
2694
2695 if (!quiet)
2696 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
2697 record__waking(rec));
2698 thread->waking = 0;
2699 fd = record__switch_output(rec, false);
2700 if (fd < 0) {
2701 pr_err("Failed to switch to new file\n");
2702 trigger_error(&switch_output_trigger);
2703 err = fd;
2704 goto out_child;
2705 }
2706
2707 /* re-arm the alarm */
2708 if (rec->switch_output.time)
2709 alarm(rec->switch_output.time);
2710 }
2711
2712 if (hits == thread->samples) {
2713 if (done || draining)
2714 break;
2715 err = fdarray__poll(&thread->pollfd, -1);
2716 /*
2717 * Propagate error, only if there's any. Ignore positive
2718 * number of returned events and interrupt error.
2719 */
2720 if (err > 0 || (err < 0 && errno == EINTR))
2721 err = 0;
2722 thread->waking++;
2723
2724 if (fdarray__filter(&thread->pollfd, POLLERR | POLLHUP,
2725 record__thread_munmap_filtered, NULL) == 0)
2726 draining = true;
2727
2728 err = record__update_evlist_pollfd_from_thread(rec, rec->evlist, thread);
2729 if (err)
2730 goto out_child;
2731 }
2732
2733 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
2734 switch (cmd) {
2735 case EVLIST_CTL_CMD_SNAPSHOT:
2736 hit_auxtrace_snapshot_trigger(rec);
2737 evlist__ctlfd_ack(rec->evlist);
2738 break;
2739 case EVLIST_CTL_CMD_STOP:
2740 done = 1;
2741 break;
2742 case EVLIST_CTL_CMD_ACK:
2743 case EVLIST_CTL_CMD_UNSUPPORTED:
2744 case EVLIST_CTL_CMD_ENABLE:
2745 case EVLIST_CTL_CMD_DISABLE:
2746 case EVLIST_CTL_CMD_EVLIST:
2747 case EVLIST_CTL_CMD_PING:
2748 default:
2749 break;
2750 }
2751 }
2752
2753 err = event_enable_timer__process(rec->evlist->eet);
2754 if (err < 0)
2755 goto out_child;
2756 if (err) {
2757 err = 0;
2758 done = 1;
2759 }
2760
2761 /*
2762 * When perf is starting the traced process, at the end events
2763 * die with the process and we wait for that. Thus no need to
2764 * disable events in this case.
2765 */
2766 if (done && !disabled && !target__none(&opts->target)) {
2767 trigger_off(&auxtrace_snapshot_trigger);
2768 evlist__disable(rec->evlist);
2769 disabled = true;
2770 }
2771 }
2772
2773 trigger_off(&auxtrace_snapshot_trigger);
2774 trigger_off(&switch_output_trigger);
2775
2776 if (opts->auxtrace_snapshot_on_exit)
2777 record__auxtrace_snapshot_exit(rec);
2778
2779 if (forks && workload_exec_errno) {
2780 char msg[STRERR_BUFSIZE], strevsels[2048];
2781 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
2782
2783 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels);
2784
2785 pr_err("Failed to collect '%s' for the '%s' workload: %s\n",
2786 strevsels, argv[0], emsg);
2787 err = -1;
2788 goto out_child;
2789 }
2790
2791 if (!quiet)
2792 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n",
2793 record__waking(rec));
2794
2795 write_finished_init(rec, true);
2796
2797 if (target__none(&rec->opts.target))
2798 record__synthesize_workload(rec, true);
2799
2800out_child:
2801 record__stop_threads(rec);
2802 record__mmap_read_all(rec, true);
2803out_free_threads:
2804 record__free_thread_data(rec);
2805 evlist__finalize_ctlfd(rec->evlist);
2806 record__aio_mmap_read_sync(rec);
2807
2808 if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
2809 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
2810 session->header.env.comp_ratio = ratio + 0.5;
2811 }
2812
2813 if (forks) {
2814 int exit_status;
2815
2816 if (!child_finished)
2817 kill(rec->evlist->workload.pid, SIGTERM);
2818
2819 wait(&exit_status);
2820
2821 if (err < 0)
2822 status = err;
2823 else if (WIFEXITED(exit_status))
2824 status = WEXITSTATUS(exit_status);
2825 else if (WIFSIGNALED(exit_status))
2826 signr = WTERMSIG(exit_status);
2827 } else
2828 status = err;
2829
2830 if (rec->off_cpu)
2831 rec->bytes_written += off_cpu_write(rec->session);
2832
2833 record__read_lost_samples(rec);
2834 record__synthesize(rec, true);
2835 /* this will be recalculated during process_buildids() */
2836 rec->samples = 0;
2837
2838 if (!err) {
2839 if (!rec->timestamp_filename) {
2840 record__finish_output(rec);
2841 } else {
2842 fd = record__switch_output(rec, true);
2843 if (fd < 0) {
2844 status = fd;
2845 goto out_delete_session;
2846 }
2847 }
2848 }
2849
2850 perf_hooks__invoke_record_end();
2851
2852 if (!err && !quiet) {
2853 char samples[128];
2854 const char *postfix = rec->timestamp_filename ?
2855 ".<timestamp>" : "";
2856
2857 if (rec->samples && !rec->opts.full_auxtrace)
2858 scnprintf(samples, sizeof(samples),
2859 " (%" PRIu64 " samples)", rec->samples);
2860 else
2861 samples[0] = '\0';
2862
2863 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2864 perf_data__size(data) / 1024.0 / 1024.0,
2865 data->path, postfix, samples);
2866 if (ratio) {
2867 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2868 rec->session->bytes_transferred / 1024.0 / 1024.0,
2869 ratio);
2870 }
2871 fprintf(stderr, " ]\n");
2872 }
2873
2874out_delete_session:
2875#ifdef HAVE_EVENTFD_SUPPORT
2876 if (done_fd >= 0) {
2877 fd = done_fd;
2878 done_fd = -1;
2879
2880 close(fd);
2881 }
2882#endif
2883 zstd_fini(&session->zstd_data);
2884 if (!opts->no_bpf_event)
2885 evlist__stop_sb_thread(rec->sb_evlist);
2886
2887 perf_session__delete(session);
2888 return status;
2889}
2890
2891static void callchain_debug(struct callchain_param *callchain)
2892{
2893 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2894
2895 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2896
2897 if (callchain->record_mode == CALLCHAIN_DWARF)
2898 pr_debug("callchain: stack dump size %d\n",
2899 callchain->dump_size);
2900}
2901
2902int record_opts__parse_callchain(struct record_opts *record,
2903 struct callchain_param *callchain,
2904 const char *arg, bool unset)
2905{
2906 int ret;
2907 callchain->enabled = !unset;
2908
2909 /* --no-call-graph */
2910 if (unset) {
2911 callchain->record_mode = CALLCHAIN_NONE;
2912 pr_debug("callchain: disabled\n");
2913 return 0;
2914 }
2915
2916 ret = parse_callchain_record_opt(arg, callchain);
2917 if (!ret) {
2918 /* Enable data address sampling for DWARF unwind. */
2919 if (callchain->record_mode == CALLCHAIN_DWARF)
2920 record->sample_address = true;
2921 callchain_debug(callchain);
2922 }
2923
2924 return ret;
2925}
2926
2927int record_parse_callchain_opt(const struct option *opt,
2928 const char *arg,
2929 int unset)
2930{
2931 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2932}
2933
2934int record_callchain_opt(const struct option *opt,
2935 const char *arg __maybe_unused,
2936 int unset __maybe_unused)
2937{
2938 struct callchain_param *callchain = opt->value;
2939
2940 callchain->enabled = true;
2941
2942 if (callchain->record_mode == CALLCHAIN_NONE)
2943 callchain->record_mode = CALLCHAIN_FP;
2944
2945 callchain_debug(callchain);
2946 return 0;
2947}
2948
2949static int perf_record_config(const char *var, const char *value, void *cb)
2950{
2951 struct record *rec = cb;
2952
2953 if (!strcmp(var, "record.build-id")) {
2954 if (!strcmp(value, "cache"))
2955 rec->no_buildid_cache = false;
2956 else if (!strcmp(value, "no-cache"))
2957 rec->no_buildid_cache = true;
2958 else if (!strcmp(value, "skip"))
2959 rec->no_buildid = true;
2960 else if (!strcmp(value, "mmap"))
2961 rec->buildid_mmap = true;
2962 else
2963 return -1;
2964 return 0;
2965 }
2966 if (!strcmp(var, "record.call-graph")) {
2967 var = "call-graph.record-mode";
2968 return perf_default_config(var, value, cb);
2969 }
2970#ifdef HAVE_AIO_SUPPORT
2971 if (!strcmp(var, "record.aio")) {
2972 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2973 if (!rec->opts.nr_cblocks)
2974 rec->opts.nr_cblocks = nr_cblocks_default;
2975 }
2976#endif
2977 if (!strcmp(var, "record.debuginfod")) {
2978 rec->debuginfod.urls = strdup(value);
2979 if (!rec->debuginfod.urls)
2980 return -ENOMEM;
2981 rec->debuginfod.set = true;
2982 }
2983
2984 return 0;
2985}
2986
2987static int record__parse_event_enable_time(const struct option *opt, const char *str, int unset)
2988{
2989 struct record *rec = (struct record *)opt->value;
2990
2991 return evlist__parse_event_enable_time(rec->evlist, &rec->opts, str, unset);
2992}
2993
2994static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2995{
2996 struct record_opts *opts = (struct record_opts *)opt->value;
2997
2998 if (unset || !str)
2999 return 0;
3000
3001 if (!strcasecmp(str, "node"))
3002 opts->affinity = PERF_AFFINITY_NODE;
3003 else if (!strcasecmp(str, "cpu"))
3004 opts->affinity = PERF_AFFINITY_CPU;
3005
3006 return 0;
3007}
3008
3009static int record__mmap_cpu_mask_alloc(struct mmap_cpu_mask *mask, int nr_bits)
3010{
3011 mask->nbits = nr_bits;
3012 mask->bits = bitmap_zalloc(mask->nbits);
3013 if (!mask->bits)
3014 return -ENOMEM;
3015
3016 return 0;
3017}
3018
3019static void record__mmap_cpu_mask_free(struct mmap_cpu_mask *mask)
3020{
3021 bitmap_free(mask->bits);
3022 mask->nbits = 0;
3023}
3024
3025static int record__thread_mask_alloc(struct thread_mask *mask, int nr_bits)
3026{
3027 int ret;
3028
3029 ret = record__mmap_cpu_mask_alloc(&mask->maps, nr_bits);
3030 if (ret) {
3031 mask->affinity.bits = NULL;
3032 return ret;
3033 }
3034
3035 ret = record__mmap_cpu_mask_alloc(&mask->affinity, nr_bits);
3036 if (ret) {
3037 record__mmap_cpu_mask_free(&mask->maps);
3038 mask->maps.bits = NULL;
3039 }
3040
3041 return ret;
3042}
3043
3044static void record__thread_mask_free(struct thread_mask *mask)
3045{
3046 record__mmap_cpu_mask_free(&mask->maps);
3047 record__mmap_cpu_mask_free(&mask->affinity);
3048}
3049
3050static int record__parse_threads(const struct option *opt, const char *str, int unset)
3051{
3052 int s;
3053 struct record_opts *opts = opt->value;
3054
3055 if (unset || !str || !strlen(str)) {
3056 opts->threads_spec = THREAD_SPEC__CPU;
3057 } else {
3058 for (s = 1; s < THREAD_SPEC__MAX; s++) {
3059 if (s == THREAD_SPEC__USER) {
3060 opts->threads_user_spec = strdup(str);
3061 if (!opts->threads_user_spec)
3062 return -ENOMEM;
3063 opts->threads_spec = THREAD_SPEC__USER;
3064 break;
3065 }
3066 if (!strncasecmp(str, thread_spec_tags[s], strlen(thread_spec_tags[s]))) {
3067 opts->threads_spec = s;
3068 break;
3069 }
3070 }
3071 }
3072
3073 if (opts->threads_spec == THREAD_SPEC__USER)
3074 pr_debug("threads_spec: %s\n", opts->threads_user_spec);
3075 else
3076 pr_debug("threads_spec: %s\n", thread_spec_tags[opts->threads_spec]);
3077
3078 return 0;
3079}
3080
3081static int parse_output_max_size(const struct option *opt,
3082 const char *str, int unset)
3083{
3084 unsigned long *s = (unsigned long *)opt->value;
3085 static struct parse_tag tags_size[] = {
3086 { .tag = 'B', .mult = 1 },
3087 { .tag = 'K', .mult = 1 << 10 },
3088 { .tag = 'M', .mult = 1 << 20 },
3089 { .tag = 'G', .mult = 1 << 30 },
3090 { .tag = 0 },
3091 };
3092 unsigned long val;
3093
3094 if (unset) {
3095 *s = 0;
3096 return 0;
3097 }
3098
3099 val = parse_tag_value(str, tags_size);
3100 if (val != (unsigned long) -1) {
3101 *s = val;
3102 return 0;
3103 }
3104
3105 return -1;
3106}
3107
3108static int record__parse_mmap_pages(const struct option *opt,
3109 const char *str,
3110 int unset __maybe_unused)
3111{
3112 struct record_opts *opts = opt->value;
3113 char *s, *p;
3114 unsigned int mmap_pages;
3115 int ret;
3116
3117 if (!str)
3118 return -EINVAL;
3119
3120 s = strdup(str);
3121 if (!s)
3122 return -ENOMEM;
3123
3124 p = strchr(s, ',');
3125 if (p)
3126 *p = '\0';
3127
3128 if (*s) {
3129 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
3130 if (ret)
3131 goto out_free;
3132 opts->mmap_pages = mmap_pages;
3133 }
3134
3135 if (!p) {
3136 ret = 0;
3137 goto out_free;
3138 }
3139
3140 ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
3141 if (ret)
3142 goto out_free;
3143
3144 opts->auxtrace_mmap_pages = mmap_pages;
3145
3146out_free:
3147 free(s);
3148 return ret;
3149}
3150
3151void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused)
3152{
3153}
3154
3155static int parse_control_option(const struct option *opt,
3156 const char *str,
3157 int unset __maybe_unused)
3158{
3159 struct record_opts *opts = opt->value;
3160
3161 return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
3162}
3163
3164static void switch_output_size_warn(struct record *rec)
3165{
3166 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
3167 struct switch_output *s = &rec->switch_output;
3168
3169 wakeup_size /= 2;
3170
3171 if (s->size < wakeup_size) {
3172 char buf[100];
3173
3174 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
3175 pr_warning("WARNING: switch-output data size lower than "
3176 "wakeup kernel buffer size (%s) "
3177 "expect bigger perf.data sizes\n", buf);
3178 }
3179}
3180
3181static int switch_output_setup(struct record *rec)
3182{
3183 struct switch_output *s = &rec->switch_output;
3184 static struct parse_tag tags_size[] = {
3185 { .tag = 'B', .mult = 1 },
3186 { .tag = 'K', .mult = 1 << 10 },
3187 { .tag = 'M', .mult = 1 << 20 },
3188 { .tag = 'G', .mult = 1 << 30 },
3189 { .tag = 0 },
3190 };
3191 static struct parse_tag tags_time[] = {
3192 { .tag = 's', .mult = 1 },
3193 { .tag = 'm', .mult = 60 },
3194 { .tag = 'h', .mult = 60*60 },
3195 { .tag = 'd', .mult = 60*60*24 },
3196 { .tag = 0 },
3197 };
3198 unsigned long val;
3199
3200 /*
3201 * If we're using --switch-output-events, then we imply its
3202 * --switch-output=signal, as we'll send a SIGUSR2 from the side band
3203 * thread to its parent.
3204 */
3205 if (rec->switch_output_event_set) {
3206 if (record__threads_enabled(rec)) {
3207 pr_warning("WARNING: --switch-output-event option is not available in parallel streaming mode.\n");
3208 return 0;
3209 }
3210 goto do_signal;
3211 }
3212
3213 if (!s->set)
3214 return 0;
3215
3216 if (record__threads_enabled(rec)) {
3217 pr_warning("WARNING: --switch-output option is not available in parallel streaming mode.\n");
3218 return 0;
3219 }
3220
3221 if (!strcmp(s->str, "signal")) {
3222do_signal:
3223 s->signal = true;
3224 pr_debug("switch-output with SIGUSR2 signal\n");
3225 goto enabled;
3226 }
3227
3228 val = parse_tag_value(s->str, tags_size);
3229 if (val != (unsigned long) -1) {
3230 s->size = val;
3231 pr_debug("switch-output with %s size threshold\n", s->str);
3232 goto enabled;
3233 }
3234
3235 val = parse_tag_value(s->str, tags_time);
3236 if (val != (unsigned long) -1) {
3237 s->time = val;
3238 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
3239 s->str, s->time);
3240 goto enabled;
3241 }
3242
3243 return -1;
3244
3245enabled:
3246 rec->timestamp_filename = true;
3247 s->enabled = true;
3248
3249 if (s->size && !rec->opts.no_buffering)
3250 switch_output_size_warn(rec);
3251
3252 return 0;
3253}
3254
3255static const char * const __record_usage[] = {
3256 "perf record [<options>] [<command>]",
3257 "perf record [<options>] -- <command> [<options>]",
3258 NULL
3259};
3260const char * const *record_usage = __record_usage;
3261
3262static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
3263 struct perf_sample *sample, struct machine *machine)
3264{
3265 /*
3266 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
3267 * no need to add them twice.
3268 */
3269 if (!(event->header.misc & PERF_RECORD_MISC_USER))
3270 return 0;
3271 return perf_event__process_mmap(tool, event, sample, machine);
3272}
3273
3274static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
3275 struct perf_sample *sample, struct machine *machine)
3276{
3277 /*
3278 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
3279 * no need to add them twice.
3280 */
3281 if (!(event->header.misc & PERF_RECORD_MISC_USER))
3282 return 0;
3283
3284 return perf_event__process_mmap2(tool, event, sample, machine);
3285}
3286
3287static int process_timestamp_boundary(struct perf_tool *tool,
3288 union perf_event *event __maybe_unused,
3289 struct perf_sample *sample,
3290 struct machine *machine __maybe_unused)
3291{
3292 struct record *rec = container_of(tool, struct record, tool);
3293
3294 set_timestamp_boundary(rec, sample->time);
3295 return 0;
3296}
3297
3298static int parse_record_synth_option(const struct option *opt,
3299 const char *str,
3300 int unset __maybe_unused)
3301{
3302 struct record_opts *opts = opt->value;
3303 char *p = strdup(str);
3304
3305 if (p == NULL)
3306 return -1;
3307
3308 opts->synth = parse_synth_opt(p);
3309 free(p);
3310
3311 if (opts->synth < 0) {
3312 pr_err("Invalid synth option: %s\n", str);
3313 return -1;
3314 }
3315 return 0;
3316}
3317
3318/*
3319 * XXX Ideally would be local to cmd_record() and passed to a record__new
3320 * because we need to have access to it in record__exit, that is called
3321 * after cmd_record() exits, but since record_options need to be accessible to
3322 * builtin-script, leave it here.
3323 *
3324 * At least we don't ouch it in all the other functions here directly.
3325 *
3326 * Just say no to tons of global variables, sigh.
3327 */
3328static struct record record = {
3329 .opts = {
3330 .sample_time = true,
3331 .mmap_pages = UINT_MAX,
3332 .user_freq = UINT_MAX,
3333 .user_interval = ULLONG_MAX,
3334 .freq = 4000,
3335 .target = {
3336 .uses_mmap = true,
3337 .default_per_cpu = true,
3338 },
3339 .mmap_flush = MMAP_FLUSH_DEFAULT,
3340 .nr_threads_synthesize = 1,
3341 .ctl_fd = -1,
3342 .ctl_fd_ack = -1,
3343 .synth = PERF_SYNTH_ALL,
3344 },
3345 .tool = {
3346 .sample = process_sample_event,
3347 .fork = perf_event__process_fork,
3348 .exit = perf_event__process_exit,
3349 .comm = perf_event__process_comm,
3350 .namespaces = perf_event__process_namespaces,
3351 .mmap = build_id__process_mmap,
3352 .mmap2 = build_id__process_mmap2,
3353 .itrace_start = process_timestamp_boundary,
3354 .aux = process_timestamp_boundary,
3355 .ordered_events = true,
3356 },
3357};
3358
3359const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
3360 "\n\t\t\t\tDefault: fp";
3361
3362static bool dry_run;
3363
3364static struct parse_events_option_args parse_events_option_args = {
3365 .evlistp = &record.evlist,
3366};
3367
3368static struct parse_events_option_args switch_output_parse_events_option_args = {
3369 .evlistp = &record.sb_evlist,
3370};
3371
3372/*
3373 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
3374 * with it and switch to use the library functions in perf_evlist that came
3375 * from builtin-record.c, i.e. use record_opts,
3376 * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
3377 * using pipes, etc.
3378 */
3379static struct option __record_options[] = {
3380 OPT_CALLBACK('e', "event", &parse_events_option_args, "event",
3381 "event selector. use 'perf list' to list available events",
3382 parse_events_option),
3383 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
3384 "event filter", parse_filter),
3385 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
3386 NULL, "don't record events from perf itself",
3387 exclude_perf),
3388 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
3389 "record events on existing process id"),
3390 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
3391 "record events on existing thread id"),
3392 OPT_INTEGER('r', "realtime", &record.realtime_prio,
3393 "collect data with this RT SCHED_FIFO priority"),
3394 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
3395 "collect data without buffering"),
3396 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
3397 "collect raw sample records from all opened counters"),
3398 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
3399 "system-wide collection from all CPUs"),
3400 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
3401 "list of cpus to monitor"),
3402 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
3403 OPT_STRING('o', "output", &record.data.path, "file",
3404 "output file name"),
3405 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
3406 &record.opts.no_inherit_set,
3407 "child tasks do not inherit counters"),
3408 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
3409 "synthesize non-sample events at the end of output"),
3410 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
3411 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
3412 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
3413 "Fail if the specified frequency can't be used"),
3414 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
3415 "profile at this frequency",
3416 record__parse_freq),
3417 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
3418 "number of mmap data pages and AUX area tracing mmap pages",
3419 record__parse_mmap_pages),
3420 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
3421 "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
3422 record__mmap_flush_parse),
3423 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
3424 NULL, "enables call-graph recording" ,
3425 &record_callchain_opt),
3426 OPT_CALLBACK(0, "call-graph", &record.opts,
3427 "record_mode[,record_size]", record_callchain_help,
3428 &record_parse_callchain_opt),
3429 OPT_INCR('v', "verbose", &verbose,
3430 "be more verbose (show counter open errors, etc)"),
3431 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any warnings or messages"),
3432 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
3433 "per thread counts"),
3434 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
3435 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
3436 "Record the sample physical addresses"),
3437 OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
3438 "Record the sampled data address data page size"),
3439 OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
3440 "Record the sampled code address (ip) page size"),
3441 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
3442 OPT_BOOLEAN(0, "sample-identifier", &record.opts.sample_identifier,
3443 "Record the sample identifier"),
3444 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
3445 &record.opts.sample_time_set,
3446 "Record the sample timestamps"),
3447 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
3448 "Record the sample period"),
3449 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
3450 "don't sample"),
3451 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
3452 &record.no_buildid_cache_set,
3453 "do not update the buildid cache"),
3454 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
3455 &record.no_buildid_set,
3456 "do not collect buildids in perf.data"),
3457 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
3458 "monitor event in cgroup name only",
3459 parse_cgroups),
3460 OPT_CALLBACK('D', "delay", &record, "ms",
3461 "ms to wait before starting measurement after program start (-1: start with events disabled), "
3462 "or ranges of time to enable events e.g. '-D 10-20,30-40'",
3463 record__parse_event_enable_time),
3464 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
3465 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
3466 "user to profile"),
3467
3468 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
3469 "branch any", "sample any taken branches",
3470 parse_branch_stack),
3471
3472 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
3473 "branch filter mask", "branch stack filter modes",
3474 parse_branch_stack),
3475 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
3476 "sample by weight (on special events only)"),
3477 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
3478 "sample transaction flags (special events only)"),
3479 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
3480 "use per-thread mmaps"),
3481 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
3482 "sample selected machine registers on interrupt,"
3483 " use '-I?' to list register names", parse_intr_regs),
3484 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
3485 "sample selected machine registers on interrupt,"
3486 " use '--user-regs=?' to list register names", parse_user_regs),
3487 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
3488 "Record running/enabled time of read (:S) events"),
3489 OPT_CALLBACK('k', "clockid", &record.opts,
3490 "clockid", "clockid to use for events, see clock_gettime()",
3491 parse_clockid),
3492 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
3493 "opts", "AUX area tracing Snapshot Mode", ""),
3494 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
3495 "opts", "sample AUX area", ""),
3496 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
3497 "per thread proc mmap processing timeout in ms"),
3498 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
3499 "Record namespaces events"),
3500 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
3501 "Record cgroup events"),
3502 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
3503 &record.opts.record_switch_events_set,
3504 "Record context switch events"),
3505 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
3506 "Configure all used events to run in kernel space.",
3507 PARSE_OPT_EXCLUSIVE),
3508 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
3509 "Configure all used events to run in user space.",
3510 PARSE_OPT_EXCLUSIVE),
3511 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
3512 "collect kernel callchains"),
3513 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
3514 "collect user callchains"),
3515 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
3516 "file", "vmlinux pathname"),
3517 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
3518 "Record build-id of all DSOs regardless of hits"),
3519 OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
3520 "Record build-id in map events"),
3521 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
3522 "append timestamp to output filename"),
3523 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
3524 "Record timestamp boundary (time of first/last samples)"),
3525 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
3526 &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
3527 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
3528 "signal"),
3529 OPT_CALLBACK_SET(0, "switch-output-event", &switch_output_parse_events_option_args,
3530 &record.switch_output_event_set, "switch output event",
3531 "switch output event selector. use 'perf list' to list available events",
3532 parse_events_option_new_evlist),
3533 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
3534 "Limit number of switch output generated files"),
3535 OPT_BOOLEAN(0, "dry-run", &dry_run,
3536 "Parse options then exit"),
3537#ifdef HAVE_AIO_SUPPORT
3538 OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
3539 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
3540 record__aio_parse),
3541#endif
3542 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
3543 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
3544 record__parse_affinity),
3545#ifdef HAVE_ZSTD_SUPPORT
3546 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, "n",
3547 "Compress records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
3548 record__parse_comp_level),
3549#endif
3550 OPT_CALLBACK(0, "max-size", &record.output_max_size,
3551 "size", "Limit the maximum size of the output file", parse_output_max_size),
3552 OPT_UINTEGER(0, "num-thread-synthesize",
3553 &record.opts.nr_threads_synthesize,
3554 "number of threads to run for event synthesis"),
3555#ifdef HAVE_LIBPFM
3556 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
3557 "libpfm4 event selector. use 'perf list' to list available events",
3558 parse_libpfm_events_option),
3559#endif
3560 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
3561 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
3562 "\t\t\t 'snapshot': AUX area tracing snapshot).\n"
3563 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
3564 "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
3565 parse_control_option),
3566 OPT_CALLBACK(0, "synth", &record.opts, "no|all|task|mmap|cgroup",
3567 "Fine-tune event synthesis: default=all", parse_record_synth_option),
3568 OPT_STRING_OPTARG_SET(0, "debuginfod", &record.debuginfod.urls,
3569 &record.debuginfod.set, "debuginfod urls",
3570 "Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
3571 "system"),
3572 OPT_CALLBACK_OPTARG(0, "threads", &record.opts, NULL, "spec",
3573 "write collected trace data into several data files using parallel threads",
3574 record__parse_threads),
3575 OPT_BOOLEAN(0, "off-cpu", &record.off_cpu, "Enable off-cpu analysis"),
3576 OPT_END()
3577};
3578
3579struct option *record_options = __record_options;
3580
3581static int record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cpu_map *cpus)
3582{
3583 struct perf_cpu cpu;
3584 int idx;
3585
3586 if (cpu_map__is_dummy(cpus))
3587 return 0;
3588
3589 perf_cpu_map__for_each_cpu_skip_any(cpu, idx, cpus) {
3590 /* Return ENODEV is input cpu is greater than max cpu */
3591 if ((unsigned long)cpu.cpu > mask->nbits)
3592 return -ENODEV;
3593 __set_bit(cpu.cpu, mask->bits);
3594 }
3595
3596 return 0;
3597}
3598
3599static int record__mmap_cpu_mask_init_spec(struct mmap_cpu_mask *mask, const char *mask_spec)
3600{
3601 struct perf_cpu_map *cpus;
3602
3603 cpus = perf_cpu_map__new(mask_spec);
3604 if (!cpus)
3605 return -ENOMEM;
3606
3607 bitmap_zero(mask->bits, mask->nbits);
3608 if (record__mmap_cpu_mask_init(mask, cpus))
3609 return -ENODEV;
3610
3611 perf_cpu_map__put(cpus);
3612
3613 return 0;
3614}
3615
3616static void record__free_thread_masks(struct record *rec, int nr_threads)
3617{
3618 int t;
3619
3620 if (rec->thread_masks)
3621 for (t = 0; t < nr_threads; t++)
3622 record__thread_mask_free(&rec->thread_masks[t]);
3623
3624 zfree(&rec->thread_masks);
3625}
3626
3627static int record__alloc_thread_masks(struct record *rec, int nr_threads, int nr_bits)
3628{
3629 int t, ret;
3630
3631 rec->thread_masks = zalloc(nr_threads * sizeof(*(rec->thread_masks)));
3632 if (!rec->thread_masks) {
3633 pr_err("Failed to allocate thread masks\n");
3634 return -ENOMEM;
3635 }
3636
3637 for (t = 0; t < nr_threads; t++) {
3638 ret = record__thread_mask_alloc(&rec->thread_masks[t], nr_bits);
3639 if (ret) {
3640 pr_err("Failed to allocate thread masks[%d]\n", t);
3641 goto out_free;
3642 }
3643 }
3644
3645 return 0;
3646
3647out_free:
3648 record__free_thread_masks(rec, nr_threads);
3649
3650 return ret;
3651}
3652
3653static int record__init_thread_cpu_masks(struct record *rec, struct perf_cpu_map *cpus)
3654{
3655 int t, ret, nr_cpus = perf_cpu_map__nr(cpus);
3656
3657 ret = record__alloc_thread_masks(rec, nr_cpus, cpu__max_cpu().cpu);
3658 if (ret)
3659 return ret;
3660
3661 rec->nr_threads = nr_cpus;
3662 pr_debug("nr_threads: %d\n", rec->nr_threads);
3663
3664 for (t = 0; t < rec->nr_threads; t++) {
3665 __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].maps.bits);
3666 __set_bit(perf_cpu_map__cpu(cpus, t).cpu, rec->thread_masks[t].affinity.bits);
3667 if (verbose > 0) {
3668 pr_debug("thread_masks[%d]: ", t);
3669 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps");
3670 pr_debug("thread_masks[%d]: ", t);
3671 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity");
3672 }
3673 }
3674
3675 return 0;
3676}
3677
3678static int record__init_thread_masks_spec(struct record *rec, struct perf_cpu_map *cpus,
3679 const char **maps_spec, const char **affinity_spec,
3680 u32 nr_spec)
3681{
3682 u32 s;
3683 int ret = 0, t = 0;
3684 struct mmap_cpu_mask cpus_mask;
3685 struct thread_mask thread_mask, full_mask, *thread_masks;
3686
3687 ret = record__mmap_cpu_mask_alloc(&cpus_mask, cpu__max_cpu().cpu);
3688 if (ret) {
3689 pr_err("Failed to allocate CPUs mask\n");
3690 return ret;
3691 }
3692
3693 ret = record__mmap_cpu_mask_init(&cpus_mask, cpus);
3694 if (ret) {
3695 pr_err("Failed to init cpu mask\n");
3696 goto out_free_cpu_mask;
3697 }
3698
3699 ret = record__thread_mask_alloc(&full_mask, cpu__max_cpu().cpu);
3700 if (ret) {
3701 pr_err("Failed to allocate full mask\n");
3702 goto out_free_cpu_mask;
3703 }
3704
3705 ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu);
3706 if (ret) {
3707 pr_err("Failed to allocate thread mask\n");
3708 goto out_free_full_and_cpu_masks;
3709 }
3710
3711 for (s = 0; s < nr_spec; s++) {
3712 ret = record__mmap_cpu_mask_init_spec(&thread_mask.maps, maps_spec[s]);
3713 if (ret) {
3714 pr_err("Failed to initialize maps thread mask\n");
3715 goto out_free;
3716 }
3717 ret = record__mmap_cpu_mask_init_spec(&thread_mask.affinity, affinity_spec[s]);
3718 if (ret) {
3719 pr_err("Failed to initialize affinity thread mask\n");
3720 goto out_free;
3721 }
3722
3723 /* ignore invalid CPUs but do not allow empty masks */
3724 if (!bitmap_and(thread_mask.maps.bits, thread_mask.maps.bits,
3725 cpus_mask.bits, thread_mask.maps.nbits)) {
3726 pr_err("Empty maps mask: %s\n", maps_spec[s]);
3727 ret = -EINVAL;
3728 goto out_free;
3729 }
3730 if (!bitmap_and(thread_mask.affinity.bits, thread_mask.affinity.bits,
3731 cpus_mask.bits, thread_mask.affinity.nbits)) {
3732 pr_err("Empty affinity mask: %s\n", affinity_spec[s]);
3733 ret = -EINVAL;
3734 goto out_free;
3735 }
3736
3737 /* do not allow intersection with other masks (full_mask) */
3738 if (bitmap_intersects(thread_mask.maps.bits, full_mask.maps.bits,
3739 thread_mask.maps.nbits)) {
3740 pr_err("Intersecting maps mask: %s\n", maps_spec[s]);
3741 ret = -EINVAL;
3742 goto out_free;
3743 }
3744 if (bitmap_intersects(thread_mask.affinity.bits, full_mask.affinity.bits,
3745 thread_mask.affinity.nbits)) {
3746 pr_err("Intersecting affinity mask: %s\n", affinity_spec[s]);
3747 ret = -EINVAL;
3748 goto out_free;
3749 }
3750
3751 bitmap_or(full_mask.maps.bits, full_mask.maps.bits,
3752 thread_mask.maps.bits, full_mask.maps.nbits);
3753 bitmap_or(full_mask.affinity.bits, full_mask.affinity.bits,
3754 thread_mask.affinity.bits, full_mask.maps.nbits);
3755
3756 thread_masks = realloc(rec->thread_masks, (t + 1) * sizeof(struct thread_mask));
3757 if (!thread_masks) {
3758 pr_err("Failed to reallocate thread masks\n");
3759 ret = -ENOMEM;
3760 goto out_free;
3761 }
3762 rec->thread_masks = thread_masks;
3763 rec->thread_masks[t] = thread_mask;
3764 if (verbose > 0) {
3765 pr_debug("thread_masks[%d]: ", t);
3766 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].maps, "maps");
3767 pr_debug("thread_masks[%d]: ", t);
3768 mmap_cpu_mask__scnprintf(&rec->thread_masks[t].affinity, "affinity");
3769 }
3770 t++;
3771 ret = record__thread_mask_alloc(&thread_mask, cpu__max_cpu().cpu);
3772 if (ret) {
3773 pr_err("Failed to allocate thread mask\n");
3774 goto out_free_full_and_cpu_masks;
3775 }
3776 }
3777 rec->nr_threads = t;
3778 pr_debug("nr_threads: %d\n", rec->nr_threads);
3779 if (!rec->nr_threads)
3780 ret = -EINVAL;
3781
3782out_free:
3783 record__thread_mask_free(&thread_mask);
3784out_free_full_and_cpu_masks:
3785 record__thread_mask_free(&full_mask);
3786out_free_cpu_mask:
3787 record__mmap_cpu_mask_free(&cpus_mask);
3788
3789 return ret;
3790}
3791
3792static int record__init_thread_core_masks(struct record *rec, struct perf_cpu_map *cpus)
3793{
3794 int ret;
3795 struct cpu_topology *topo;
3796
3797 topo = cpu_topology__new();
3798 if (!topo) {
3799 pr_err("Failed to allocate CPU topology\n");
3800 return -ENOMEM;
3801 }
3802
3803 ret = record__init_thread_masks_spec(rec, cpus, topo->core_cpus_list,
3804 topo->core_cpus_list, topo->core_cpus_lists);
3805 cpu_topology__delete(topo);
3806
3807 return ret;
3808}
3809
3810static int record__init_thread_package_masks(struct record *rec, struct perf_cpu_map *cpus)
3811{
3812 int ret;
3813 struct cpu_topology *topo;
3814
3815 topo = cpu_topology__new();
3816 if (!topo) {
3817 pr_err("Failed to allocate CPU topology\n");
3818 return -ENOMEM;
3819 }
3820
3821 ret = record__init_thread_masks_spec(rec, cpus, topo->package_cpus_list,
3822 topo->package_cpus_list, topo->package_cpus_lists);
3823 cpu_topology__delete(topo);
3824
3825 return ret;
3826}
3827
3828static int record__init_thread_numa_masks(struct record *rec, struct perf_cpu_map *cpus)
3829{
3830 u32 s;
3831 int ret;
3832 const char **spec;
3833 struct numa_topology *topo;
3834
3835 topo = numa_topology__new();
3836 if (!topo) {
3837 pr_err("Failed to allocate NUMA topology\n");
3838 return -ENOMEM;
3839 }
3840
3841 spec = zalloc(topo->nr * sizeof(char *));
3842 if (!spec) {
3843 pr_err("Failed to allocate NUMA spec\n");
3844 ret = -ENOMEM;
3845 goto out_delete_topo;
3846 }
3847 for (s = 0; s < topo->nr; s++)
3848 spec[s] = topo->nodes[s].cpus;
3849
3850 ret = record__init_thread_masks_spec(rec, cpus, spec, spec, topo->nr);
3851
3852 zfree(&spec);
3853
3854out_delete_topo:
3855 numa_topology__delete(topo);
3856
3857 return ret;
3858}
3859
3860static int record__init_thread_user_masks(struct record *rec, struct perf_cpu_map *cpus)
3861{
3862 int t, ret;
3863 u32 s, nr_spec = 0;
3864 char **maps_spec = NULL, **affinity_spec = NULL, **tmp_spec;
3865 char *user_spec, *spec, *spec_ptr, *mask, *mask_ptr, *dup_mask = NULL;
3866
3867 for (t = 0, user_spec = (char *)rec->opts.threads_user_spec; ; t++, user_spec = NULL) {
3868 spec = strtok_r(user_spec, ":", &spec_ptr);
3869 if (spec == NULL)
3870 break;
3871 pr_debug2("threads_spec[%d]: %s\n", t, spec);
3872 mask = strtok_r(spec, "/", &mask_ptr);
3873 if (mask == NULL)
3874 break;
3875 pr_debug2(" maps mask: %s\n", mask);
3876 tmp_spec = realloc(maps_spec, (nr_spec + 1) * sizeof(char *));
3877 if (!tmp_spec) {
3878 pr_err("Failed to reallocate maps spec\n");
3879 ret = -ENOMEM;
3880 goto out_free;
3881 }
3882 maps_spec = tmp_spec;
3883 maps_spec[nr_spec] = dup_mask = strdup(mask);
3884 if (!maps_spec[nr_spec]) {
3885 pr_err("Failed to allocate maps spec[%d]\n", nr_spec);
3886 ret = -ENOMEM;
3887 goto out_free;
3888 }
3889 mask = strtok_r(NULL, "/", &mask_ptr);
3890 if (mask == NULL) {
3891 pr_err("Invalid thread maps or affinity specs\n");
3892 ret = -EINVAL;
3893 goto out_free;
3894 }
3895 pr_debug2(" affinity mask: %s\n", mask);
3896 tmp_spec = realloc(affinity_spec, (nr_spec + 1) * sizeof(char *));
3897 if (!tmp_spec) {
3898 pr_err("Failed to reallocate affinity spec\n");
3899 ret = -ENOMEM;
3900 goto out_free;
3901 }
3902 affinity_spec = tmp_spec;
3903 affinity_spec[nr_spec] = strdup(mask);
3904 if (!affinity_spec[nr_spec]) {
3905 pr_err("Failed to allocate affinity spec[%d]\n", nr_spec);
3906 ret = -ENOMEM;
3907 goto out_free;
3908 }
3909 dup_mask = NULL;
3910 nr_spec++;
3911 }
3912
3913 ret = record__init_thread_masks_spec(rec, cpus, (const char **)maps_spec,
3914 (const char **)affinity_spec, nr_spec);
3915
3916out_free:
3917 free(dup_mask);
3918 for (s = 0; s < nr_spec; s++) {
3919 if (maps_spec)
3920 free(maps_spec[s]);
3921 if (affinity_spec)
3922 free(affinity_spec[s]);
3923 }
3924 free(affinity_spec);
3925 free(maps_spec);
3926
3927 return ret;
3928}
3929
3930static int record__init_thread_default_masks(struct record *rec, struct perf_cpu_map *cpus)
3931{
3932 int ret;
3933
3934 ret = record__alloc_thread_masks(rec, 1, cpu__max_cpu().cpu);
3935 if (ret)
3936 return ret;
3937
3938 if (record__mmap_cpu_mask_init(&rec->thread_masks->maps, cpus))
3939 return -ENODEV;
3940
3941 rec->nr_threads = 1;
3942
3943 return 0;
3944}
3945
3946static int record__init_thread_masks(struct record *rec)
3947{
3948 int ret = 0;
3949 struct perf_cpu_map *cpus = rec->evlist->core.all_cpus;
3950
3951 if (!record__threads_enabled(rec))
3952 return record__init_thread_default_masks(rec, cpus);
3953
3954 if (evlist__per_thread(rec->evlist)) {
3955 pr_err("--per-thread option is mutually exclusive to parallel streaming mode.\n");
3956 return -EINVAL;
3957 }
3958
3959 switch (rec->opts.threads_spec) {
3960 case THREAD_SPEC__CPU:
3961 ret = record__init_thread_cpu_masks(rec, cpus);
3962 break;
3963 case THREAD_SPEC__CORE:
3964 ret = record__init_thread_core_masks(rec, cpus);
3965 break;
3966 case THREAD_SPEC__PACKAGE:
3967 ret = record__init_thread_package_masks(rec, cpus);
3968 break;
3969 case THREAD_SPEC__NUMA:
3970 ret = record__init_thread_numa_masks(rec, cpus);
3971 break;
3972 case THREAD_SPEC__USER:
3973 ret = record__init_thread_user_masks(rec, cpus);
3974 break;
3975 default:
3976 break;
3977 }
3978
3979 return ret;
3980}
3981
3982int cmd_record(int argc, const char **argv)
3983{
3984 int err;
3985 struct record *rec = &record;
3986 char errbuf[BUFSIZ];
3987
3988 setlocale(LC_ALL, "");
3989
3990#ifndef HAVE_BPF_SKEL
3991# define set_nobuild(s, l, m, c) set_option_nobuild(record_options, s, l, m, c)
3992 set_nobuild('\0', "off-cpu", "no BUILD_BPF_SKEL=1", true);
3993# undef set_nobuild
3994#endif
3995
3996 /* Disable eager loading of kernel symbols that adds overhead to perf record. */
3997 symbol_conf.lazy_load_kernel_maps = true;
3998 rec->opts.affinity = PERF_AFFINITY_SYS;
3999
4000 rec->evlist = evlist__new();
4001 if (rec->evlist == NULL)
4002 return -ENOMEM;
4003
4004 err = perf_config(perf_record_config, rec);
4005 if (err)
4006 return err;
4007
4008 argc = parse_options(argc, argv, record_options, record_usage,
4009 PARSE_OPT_STOP_AT_NON_OPTION);
4010 if (quiet)
4011 perf_quiet_option();
4012
4013 err = symbol__validate_sym_arguments();
4014 if (err)
4015 return err;
4016
4017 perf_debuginfod_setup(&record.debuginfod);
4018
4019 /* Make system wide (-a) the default target. */
4020 if (!argc && target__none(&rec->opts.target))
4021 rec->opts.target.system_wide = true;
4022
4023 if (nr_cgroups && !rec->opts.target.system_wide) {
4024 usage_with_options_msg(record_usage, record_options,
4025 "cgroup monitoring only available in system-wide mode");
4026
4027 }
4028
4029 if (rec->buildid_mmap) {
4030 if (!perf_can_record_build_id()) {
4031 pr_err("Failed: no support to record build id in mmap events, update your kernel.\n");
4032 err = -EINVAL;
4033 goto out_opts;
4034 }
4035 pr_debug("Enabling build id in mmap2 events.\n");
4036 /* Enable mmap build id synthesizing. */
4037 symbol_conf.buildid_mmap2 = true;
4038 /* Enable perf_event_attr::build_id bit. */
4039 rec->opts.build_id = true;
4040 /* Disable build id cache. */
4041 rec->no_buildid = true;
4042 }
4043
4044 if (rec->opts.record_cgroup && !perf_can_record_cgroup()) {
4045 pr_err("Kernel has no cgroup sampling support.\n");
4046 err = -EINVAL;
4047 goto out_opts;
4048 }
4049
4050 if (rec->opts.kcore)
4051 rec->opts.text_poke = true;
4052
4053 if (rec->opts.kcore || record__threads_enabled(rec))
4054 rec->data.is_dir = true;
4055
4056 if (record__threads_enabled(rec)) {
4057 if (rec->opts.affinity != PERF_AFFINITY_SYS) {
4058 pr_err("--affinity option is mutually exclusive to parallel streaming mode.\n");
4059 goto out_opts;
4060 }
4061 if (record__aio_enabled(rec)) {
4062 pr_err("Asynchronous streaming mode (--aio) is mutually exclusive to parallel streaming mode.\n");
4063 goto out_opts;
4064 }
4065 }
4066
4067 if (rec->opts.comp_level != 0) {
4068 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
4069 rec->no_buildid = true;
4070 }
4071
4072 if (rec->opts.record_switch_events &&
4073 !perf_can_record_switch_events()) {
4074 ui__error("kernel does not support recording context switch events\n");
4075 parse_options_usage(record_usage, record_options, "switch-events", 0);
4076 err = -EINVAL;
4077 goto out_opts;
4078 }
4079
4080 if (switch_output_setup(rec)) {
4081 parse_options_usage(record_usage, record_options, "switch-output", 0);
4082 err = -EINVAL;
4083 goto out_opts;
4084 }
4085
4086 if (rec->switch_output.time) {
4087 signal(SIGALRM, alarm_sig_handler);
4088 alarm(rec->switch_output.time);
4089 }
4090
4091 if (rec->switch_output.num_files) {
4092 rec->switch_output.filenames = calloc(rec->switch_output.num_files,
4093 sizeof(char *));
4094 if (!rec->switch_output.filenames) {
4095 err = -EINVAL;
4096 goto out_opts;
4097 }
4098 }
4099
4100 if (rec->timestamp_filename && record__threads_enabled(rec)) {
4101 rec->timestamp_filename = false;
4102 pr_warning("WARNING: --timestamp-filename option is not available in parallel streaming mode.\n");
4103 }
4104
4105 /*
4106 * Allow aliases to facilitate the lookup of symbols for address
4107 * filters. Refer to auxtrace_parse_filters().
4108 */
4109 symbol_conf.allow_aliases = true;
4110
4111 symbol__init(NULL);
4112
4113 err = record__auxtrace_init(rec);
4114 if (err)
4115 goto out;
4116
4117 if (dry_run)
4118 goto out;
4119
4120 err = -ENOMEM;
4121
4122 if (rec->no_buildid_cache || rec->no_buildid) {
4123 disable_buildid_cache();
4124 } else if (rec->switch_output.enabled) {
4125 /*
4126 * In 'perf record --switch-output', disable buildid
4127 * generation by default to reduce data file switching
4128 * overhead. Still generate buildid if they are required
4129 * explicitly using
4130 *
4131 * perf record --switch-output --no-no-buildid \
4132 * --no-no-buildid-cache
4133 *
4134 * Following code equals to:
4135 *
4136 * if ((rec->no_buildid || !rec->no_buildid_set) &&
4137 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
4138 * disable_buildid_cache();
4139 */
4140 bool disable = true;
4141
4142 if (rec->no_buildid_set && !rec->no_buildid)
4143 disable = false;
4144 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
4145 disable = false;
4146 if (disable) {
4147 rec->no_buildid = true;
4148 rec->no_buildid_cache = true;
4149 disable_buildid_cache();
4150 }
4151 }
4152
4153 if (record.opts.overwrite)
4154 record.opts.tail_synthesize = true;
4155
4156 if (rec->evlist->core.nr_entries == 0) {
4157 bool can_profile_kernel = perf_event_paranoid_check(1);
4158
4159 err = parse_event(rec->evlist, can_profile_kernel ? "cycles:P" : "cycles:Pu");
4160 if (err)
4161 goto out;
4162 }
4163
4164 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
4165 rec->opts.no_inherit = true;
4166
4167 err = target__validate(&rec->opts.target);
4168 if (err) {
4169 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
4170 ui__warning("%s\n", errbuf);
4171 }
4172
4173 err = target__parse_uid(&rec->opts.target);
4174 if (err) {
4175 int saved_errno = errno;
4176
4177 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
4178 ui__error("%s", errbuf);
4179
4180 err = -saved_errno;
4181 goto out;
4182 }
4183
4184 /* Enable ignoring missing threads when -u/-p option is defined. */
4185 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
4186
4187 evlist__warn_user_requested_cpus(rec->evlist, rec->opts.target.cpu_list);
4188
4189 if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP)
4190 arch__add_leaf_frame_record_opts(&rec->opts);
4191
4192 err = -ENOMEM;
4193 if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) {
4194 if (rec->opts.target.pid != NULL) {
4195 pr_err("Couldn't create thread/CPU maps: %s\n",
4196 errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
4197 goto out;
4198 }
4199 else
4200 usage_with_options(record_usage, record_options);
4201 }
4202
4203 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
4204 if (err)
4205 goto out;
4206
4207 /*
4208 * We take all buildids when the file contains
4209 * AUX area tracing data because we do not decode the
4210 * trace because it would take too long.
4211 */
4212 if (rec->opts.full_auxtrace)
4213 rec->buildid_all = true;
4214
4215 if (rec->opts.text_poke) {
4216 err = record__config_text_poke(rec->evlist);
4217 if (err) {
4218 pr_err("record__config_text_poke failed, error %d\n", err);
4219 goto out;
4220 }
4221 }
4222
4223 if (rec->off_cpu) {
4224 err = record__config_off_cpu(rec);
4225 if (err) {
4226 pr_err("record__config_off_cpu failed, error %d\n", err);
4227 goto out;
4228 }
4229 }
4230
4231 if (record_opts__config(&rec->opts)) {
4232 err = -EINVAL;
4233 goto out;
4234 }
4235
4236 err = record__config_tracking_events(rec);
4237 if (err) {
4238 pr_err("record__config_tracking_events failed, error %d\n", err);
4239 goto out;
4240 }
4241
4242 err = record__init_thread_masks(rec);
4243 if (err) {
4244 pr_err("Failed to initialize parallel data streaming masks\n");
4245 goto out;
4246 }
4247
4248 if (rec->opts.nr_cblocks > nr_cblocks_max)
4249 rec->opts.nr_cblocks = nr_cblocks_max;
4250 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
4251
4252 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
4253 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
4254
4255 if (rec->opts.comp_level > comp_level_max)
4256 rec->opts.comp_level = comp_level_max;
4257 pr_debug("comp level: %d\n", rec->opts.comp_level);
4258
4259 err = __cmd_record(&record, argc, argv);
4260out:
4261 evlist__delete(rec->evlist);
4262 symbol__exit();
4263 auxtrace_record__free(rec->itr);
4264out_opts:
4265 record__free_thread_masks(rec, rec->nr_threads);
4266 rec->nr_threads = 0;
4267 evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
4268 return err;
4269}
4270
4271static void snapshot_sig_handler(int sig __maybe_unused)
4272{
4273 struct record *rec = &record;
4274
4275 hit_auxtrace_snapshot_trigger(rec);
4276
4277 if (switch_output_signal(rec))
4278 trigger_hit(&switch_output_trigger);
4279}
4280
4281static void alarm_sig_handler(int sig __maybe_unused)
4282{
4283 struct record *rec = &record;
4284
4285 if (switch_output_time(rec))
4286 trigger_hit(&switch_output_trigger);
4287}
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 const char *filter_action;
175 struct switch_output switch_output;
176 unsigned long long samples;
177 unsigned long output_max_size; /* = 0: unlimited */
178 struct perf_debuginfod debuginfod;
179 int nr_threads;
180 struct thread_mask *thread_masks;
181 struct record_thread *thread_data;
182 struct pollfd_index_map *index_map;
183 size_t index_map_sz;
184 size_t index_map_cnt;
185};
186
187static volatile int done;
188
189static volatile int auxtrace_record__snapshot_started;
190static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
191static DEFINE_TRIGGER(switch_output_trigger);
192
193static const char *affinity_tags[PERF_AFFINITY_MAX] = {
194 "SYS", "NODE", "CPU"
195};
196
197static int build_id__process_mmap(const struct perf_tool *tool, union perf_event *event,
198 struct perf_sample *sample, struct machine *machine);
199static int build_id__process_mmap2(const struct perf_tool *tool, union perf_event *event,
200 struct perf_sample *sample, struct machine *machine);
201static int process_timestamp_boundary(const struct perf_tool *tool,
202 union perf_event *event,
203 struct perf_sample *sample,
204 struct machine *machine);
205
206#ifndef HAVE_GETTID
207static inline pid_t gettid(void)
208{
209 return (pid_t)syscall(__NR_gettid);
210}
211#endif
212
213static int record__threads_enabled(struct record *rec)
214{
215 return rec->opts.threads_spec;
216}
217
218static bool switch_output_signal(struct record *rec)
219{
220 return rec->switch_output.signal &&
221 trigger_is_ready(&switch_output_trigger);
222}
223
224static bool switch_output_size(struct record *rec)
225{
226 return rec->switch_output.size &&
227 trigger_is_ready(&switch_output_trigger) &&
228 (rec->bytes_written >= rec->switch_output.size);
229}
230
231static bool switch_output_time(struct record *rec)
232{
233 return rec->switch_output.time &&
234 trigger_is_ready(&switch_output_trigger);
235}
236
237static u64 record__bytes_written(struct record *rec)
238{
239 return rec->bytes_written + rec->thread_bytes_written;
240}
241
242static bool record__output_max_size_exceeded(struct record *rec)
243{
244 return rec->output_max_size &&
245 (record__bytes_written(rec) >= rec->output_max_size);
246}
247
248static int record__write(struct record *rec, struct mmap *map __maybe_unused,
249 void *bf, size_t size)
250{
251 struct perf_data_file *file = &rec->session->data->file;
252
253 if (map && map->file)
254 file = map->file;
255
256 if (perf_data_file__write(file, bf, size) < 0) {
257 pr_err("failed to write perf data, error: %m\n");
258 return -1;
259 }
260
261 if (map && map->file) {
262 thread->bytes_written += size;
263 rec->thread_bytes_written += size;
264 } else {
265 rec->bytes_written += size;
266 }
267
268 if (record__output_max_size_exceeded(rec) && !done) {
269 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
270 " stopping session ]\n",
271 record__bytes_written(rec) >> 10);
272 done = 1;
273 }
274
275 if (switch_output_size(rec))
276 trigger_hit(&switch_output_trigger);
277
278 return 0;
279}
280
281static int record__aio_enabled(struct record *rec);
282static int record__comp_enabled(struct record *rec);
283static ssize_t zstd_compress(struct perf_session *session, struct mmap *map,
284 void *dst, size_t dst_size, void *src, size_t src_size);
285
286#ifdef HAVE_AIO_SUPPORT
287static int record__aio_write(struct aiocb *cblock, int trace_fd,
288 void *buf, size_t size, off_t off)
289{
290 int rc;
291
292 cblock->aio_fildes = trace_fd;
293 cblock->aio_buf = buf;
294 cblock->aio_nbytes = size;
295 cblock->aio_offset = off;
296 cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
297
298 do {
299 rc = aio_write(cblock);
300 if (rc == 0) {
301 break;
302 } else if (errno != EAGAIN) {
303 cblock->aio_fildes = -1;
304 pr_err("failed to queue perf data, error: %m\n");
305 break;
306 }
307 } while (1);
308
309 return rc;
310}
311
312static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
313{
314 void *rem_buf;
315 off_t rem_off;
316 size_t rem_size;
317 int rc, aio_errno;
318 ssize_t aio_ret, written;
319
320 aio_errno = aio_error(cblock);
321 if (aio_errno == EINPROGRESS)
322 return 0;
323
324 written = aio_ret = aio_return(cblock);
325 if (aio_ret < 0) {
326 if (aio_errno != EINTR)
327 pr_err("failed to write perf data, error: %m\n");
328 written = 0;
329 }
330
331 rem_size = cblock->aio_nbytes - written;
332
333 if (rem_size == 0) {
334 cblock->aio_fildes = -1;
335 /*
336 * md->refcount is incremented in record__aio_pushfn() for
337 * every aio write request started in record__aio_push() so
338 * decrement it because the request is now complete.
339 */
340 perf_mmap__put(&md->core);
341 rc = 1;
342 } else {
343 /*
344 * aio write request may require restart with the
345 * remainder if the kernel didn't write whole
346 * chunk at once.
347 */
348 rem_off = cblock->aio_offset + written;
349 rem_buf = (void *)(cblock->aio_buf + written);
350 record__aio_write(cblock, cblock->aio_fildes,
351 rem_buf, rem_size, rem_off);
352 rc = 0;
353 }
354
355 return rc;
356}
357
358static int record__aio_sync(struct mmap *md, bool sync_all)
359{
360 struct aiocb **aiocb = md->aio.aiocb;
361 struct aiocb *cblocks = md->aio.cblocks;
362 struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */
363 int i, do_suspend;
364
365 do {
366 do_suspend = 0;
367 for (i = 0; i < md->aio.nr_cblocks; ++i) {
368 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
369 if (sync_all)
370 aiocb[i] = NULL;
371 else
372 return i;
373 } else {
374 /*
375 * Started aio write is not complete yet
376 * so it has to be waited before the
377 * next allocation.
378 */
379 aiocb[i] = &cblocks[i];
380 do_suspend = 1;
381 }
382 }
383 if (!do_suspend)
384 return -1;
385
386 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
387 if (!(errno == EAGAIN || errno == EINTR))
388 pr_err("failed to sync perf data, error: %m\n");
389 }
390 } while (1);
391}
392
393struct record_aio {
394 struct record *rec;
395 void *data;
396 size_t size;
397};
398
399static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
400{
401 struct record_aio *aio = to;
402
403 /*
404 * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
405 * to release space in the kernel buffer as fast as possible, calling
406 * perf_mmap__consume() from perf_mmap__push() function.
407 *
408 * That lets the kernel to proceed with storing more profiling data into
409 * the kernel buffer earlier than other per-cpu kernel buffers are handled.
410 *
411 * Coping can be done in two steps in case the chunk of profiling data
412 * crosses the upper bound of the kernel buffer. In this case we first move
413 * part of data from map->start till the upper bound and then the remainder
414 * from the beginning of the kernel buffer till the end of the data chunk.
415 */
416
417 if (record__comp_enabled(aio->rec)) {
418 ssize_t compressed = zstd_compress(aio->rec->session, NULL, aio->data + aio->size,
419 mmap__mmap_len(map) - aio->size,
420 buf, size);
421 if (compressed < 0)
422 return (int)compressed;
423
424 size = compressed;
425 } else {
426 memcpy(aio->data + aio->size, buf, size);
427 }
428
429 if (!aio->size) {
430 /*
431 * Increment map->refcount to guard map->aio.data[] buffer
432 * from premature deallocation because map object can be
433 * released earlier than aio write request started on
434 * map->aio.data[] buffer is complete.
435 *
436 * perf_mmap__put() is done at record__aio_complete()
437 * after started aio request completion or at record__aio_push()
438 * if the request failed to start.
439 */
440 perf_mmap__get(&map->core);
441 }
442
443 aio->size += size;
444
445 return size;
446}
447
448static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
449{
450 int ret, idx;
451 int trace_fd = rec->session->data->file.fd;
452 struct record_aio aio = { .rec = rec, .size = 0 };
453
454 /*
455 * Call record__aio_sync() to wait till map->aio.data[] buffer
456 * becomes available after previous aio write operation.
457 */
458
459 idx = record__aio_sync(map, false);
460 aio.data = map->aio.data[idx];
461 ret = perf_mmap__push(map, &aio, record__aio_pushfn);
462 if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
463 return ret;
464
465 rec->samples++;
466 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
467 if (!ret) {
468 *off += aio.size;
469 rec->bytes_written += aio.size;
470 if (switch_output_size(rec))
471 trigger_hit(&switch_output_trigger);
472 } else {
473 /*
474 * Decrement map->refcount incremented in record__aio_pushfn()
475 * back if record__aio_write() operation failed to start, otherwise
476 * map->refcount is decremented in record__aio_complete() after
477 * aio write operation finishes successfully.
478 */
479 perf_mmap__put(&map->core);
480 }
481
482 return ret;
483}
484
485static off_t record__aio_get_pos(int trace_fd)
486{
487 return lseek(trace_fd, 0, SEEK_CUR);
488}
489
490static void record__aio_set_pos(int trace_fd, off_t pos)
491{
492 lseek(trace_fd, pos, SEEK_SET);
493}
494
495static void record__aio_mmap_read_sync(struct record *rec)
496{
497 int i;
498 struct evlist *evlist = rec->evlist;
499 struct mmap *maps = evlist->mmap;
500
501 if (!record__aio_enabled(rec))
502 return;
503
504 for (i = 0; i < evlist->core.nr_mmaps; i++) {
505 struct mmap *map = &maps[i];
506
507 if (map->core.base)
508 record__aio_sync(map, true);
509 }
510}
511
512static int nr_cblocks_default = 1;
513static int nr_cblocks_max = 4;
514
515static int record__aio_parse(const struct option *opt,
516 const char *str,
517 int unset)
518{
519 struct record_opts *opts = (struct record_opts *)opt->value;
520
521 if (unset) {
522 opts->nr_cblocks = 0;
523 } else {
524 if (str)
525 opts->nr_cblocks = strtol(str, NULL, 0);
526 if (!opts->nr_cblocks)
527 opts->nr_cblocks = nr_cblocks_default;
528 }
529
530 return 0;
531}
532#else /* HAVE_AIO_SUPPORT */
533static int nr_cblocks_max = 0;
534
535static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
536 off_t *off __maybe_unused)
537{
538 return -1;
539}
540
541static off_t record__aio_get_pos(int trace_fd __maybe_unused)
542{
543 return -1;
544}
545
546static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
547{
548}
549
550static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
551{
552}
553#endif
554
555static int record__aio_enabled(struct record *rec)
556{
557 return rec->opts.nr_cblocks > 0;
558}
559
560#define MMAP_FLUSH_DEFAULT 1
561static int record__mmap_flush_parse(const struct option *opt,
562 const char *str,
563 int unset)
564{
565 int flush_max;
566 struct record_opts *opts = (struct record_opts *)opt->value;
567 static struct parse_tag tags[] = {
568 { .tag = 'B', .mult = 1 },
569 { .tag = 'K', .mult = 1 << 10 },
570 { .tag = 'M', .mult = 1 << 20 },
571 { .tag = 'G', .mult = 1 << 30 },
572 { .tag = 0 },
573 };
574
575 if (unset)
576 return 0;
577
578 if (str) {
579 opts->mmap_flush = parse_tag_value(str, tags);
580 if (opts->mmap_flush == (int)-1)
581 opts->mmap_flush = strtol(str, NULL, 0);
582 }
583
584 if (!opts->mmap_flush)
585 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
586
587 flush_max = evlist__mmap_size(opts->mmap_pages);
588 flush_max /= 4;
589 if (opts->mmap_flush > flush_max)
590 opts->mmap_flush = flush_max;
591
592 return 0;
593}
594
595#ifdef HAVE_ZSTD_SUPPORT
596static unsigned int comp_level_default = 1;
597
598static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
599{
600 struct record_opts *opts = opt->value;
601
602 if (unset) {
603 opts->comp_level = 0;
604 } else {
605 if (str)
606 opts->comp_level = strtol(str, NULL, 0);
607 if (!opts->comp_level)
608 opts->comp_level = comp_level_default;
609 }
610
611 return 0;
612}
613#endif
614static unsigned int comp_level_max = 22;
615
616static int record__comp_enabled(struct record *rec)
617{
618 return rec->opts.comp_level > 0;
619}
620
621static int process_synthesized_event(const struct perf_tool *tool,
622 union perf_event *event,
623 struct perf_sample *sample __maybe_unused,
624 struct machine *machine __maybe_unused)
625{
626 struct record *rec = container_of(tool, struct record, tool);
627 return record__write(rec, NULL, event, event->header.size);
628}
629
630static struct mutex synth_lock;
631
632static int process_locked_synthesized_event(const struct perf_tool *tool,
633 union perf_event *event,
634 struct perf_sample *sample __maybe_unused,
635 struct machine *machine __maybe_unused)
636{
637 int ret;
638
639 mutex_lock(&synth_lock);
640 ret = process_synthesized_event(tool, event, sample, machine);
641 mutex_unlock(&synth_lock);
642 return ret;
643}
644
645static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
646{
647 struct record *rec = to;
648
649 if (record__comp_enabled(rec)) {
650 ssize_t compressed = zstd_compress(rec->session, map, map->data,
651 mmap__mmap_len(map), bf, size);
652
653 if (compressed < 0)
654 return (int)compressed;
655
656 size = compressed;
657 bf = map->data;
658 }
659
660 thread->samples++;
661 return record__write(rec, map, bf, size);
662}
663
664static volatile sig_atomic_t signr = -1;
665static volatile sig_atomic_t child_finished;
666#ifdef HAVE_EVENTFD_SUPPORT
667static volatile sig_atomic_t done_fd = -1;
668#endif
669
670static void sig_handler(int sig)
671{
672 if (sig == SIGCHLD)
673 child_finished = 1;
674 else
675 signr = sig;
676
677 done = 1;
678#ifdef HAVE_EVENTFD_SUPPORT
679 if (done_fd >= 0) {
680 u64 tmp = 1;
681 int orig_errno = errno;
682
683 /*
684 * It is possible for this signal handler to run after done is
685 * checked in the main loop, but before the perf counter fds are
686 * polled. If this happens, the poll() will continue to wait
687 * even though done is set, and will only break out if either
688 * another signal is received, or the counters are ready for
689 * read. To ensure the poll() doesn't sleep when done is set,
690 * use an eventfd (done_fd) to wake up the poll().
691 */
692 if (write(done_fd, &tmp, sizeof(tmp)) < 0)
693 pr_err("failed to signal wakeup fd, error: %m\n");
694
695 errno = orig_errno;
696 }
697#endif // HAVE_EVENTFD_SUPPORT
698}
699
700static void sigsegv_handler(int sig)
701{
702 perf_hooks__recover();
703 sighandler_dump_stack(sig);
704}
705
706static void record__sig_exit(void)
707{
708 if (signr == -1)
709 return;
710
711 signal(signr, SIG_DFL);
712 raise(signr);
713}
714
715#ifdef HAVE_AUXTRACE_SUPPORT
716
717static int record__process_auxtrace(const struct perf_tool *tool,
718 struct mmap *map,
719 union perf_event *event, void *data1,
720 size_t len1, void *data2, size_t len2)
721{
722 struct record *rec = container_of(tool, struct record, tool);
723 struct perf_data *data = &rec->data;
724 size_t padding;
725 u8 pad[8] = {0};
726
727 if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
728 off_t file_offset;
729 int fd = perf_data__fd(data);
730 int err;
731
732 file_offset = lseek(fd, 0, SEEK_CUR);
733 if (file_offset == -1)
734 return -1;
735 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
736 event, file_offset);
737 if (err)
738 return err;
739 }
740
741 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
742 padding = (len1 + len2) & 7;
743 if (padding)
744 padding = 8 - padding;
745
746 record__write(rec, map, event, event->header.size);
747 record__write(rec, map, data1, len1);
748 if (len2)
749 record__write(rec, map, data2, len2);
750 record__write(rec, map, &pad, padding);
751
752 return 0;
753}
754
755static int record__auxtrace_mmap_read(struct record *rec,
756 struct mmap *map)
757{
758 int ret;
759
760 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
761 record__process_auxtrace);
762 if (ret < 0)
763 return ret;
764
765 if (ret)
766 rec->samples++;
767
768 return 0;
769}
770
771static int record__auxtrace_mmap_read_snapshot(struct record *rec,
772 struct mmap *map)
773{
774 int ret;
775
776 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
777 record__process_auxtrace,
778 rec->opts.auxtrace_snapshot_size);
779 if (ret < 0)
780 return ret;
781
782 if (ret)
783 rec->samples++;
784
785 return 0;
786}
787
788static int record__auxtrace_read_snapshot_all(struct record *rec)
789{
790 int i;
791 int rc = 0;
792
793 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
794 struct mmap *map = &rec->evlist->mmap[i];
795
796 if (!map->auxtrace_mmap.base)
797 continue;
798
799 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
800 rc = -1;
801 goto out;
802 }
803 }
804out:
805 return rc;
806}
807
808static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
809{
810 pr_debug("Recording AUX area tracing snapshot\n");
811 if (record__auxtrace_read_snapshot_all(rec) < 0) {
812 trigger_error(&auxtrace_snapshot_trigger);
813 } else {
814 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
815 trigger_error(&auxtrace_snapshot_trigger);
816 else
817 trigger_ready(&auxtrace_snapshot_trigger);
818 }
819}
820
821static int record__auxtrace_snapshot_exit(struct record *rec)
822{
823 if (trigger_is_error(&auxtrace_snapshot_trigger))
824 return 0;
825
826 if (!auxtrace_record__snapshot_started &&
827 auxtrace_record__snapshot_start(rec->itr))
828 return -1;
829
830 record__read_auxtrace_snapshot(rec, true);
831 if (trigger_is_error(&auxtrace_snapshot_trigger))
832 return -1;
833
834 return 0;
835}
836
837static int record__auxtrace_init(struct record *rec)
838{
839 int err;
840
841 if ((rec->opts.auxtrace_snapshot_opts || rec->opts.auxtrace_sample_opts)
842 && record__threads_enabled(rec)) {
843 pr_err("AUX area tracing options are not available in parallel streaming mode.\n");
844 return -EINVAL;
845 }
846
847 if (!rec->itr) {
848 rec->itr = auxtrace_record__init(rec->evlist, &err);
849 if (err)
850 return err;
851 }
852
853 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
854 rec->opts.auxtrace_snapshot_opts);
855 if (err)
856 return err;
857
858 err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
859 rec->opts.auxtrace_sample_opts);
860 if (err)
861 return err;
862
863 auxtrace_regroup_aux_output(rec->evlist);
864
865 return auxtrace_parse_filters(rec->evlist);
866}
867
868#else
869
870static inline
871int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
872 struct mmap *map __maybe_unused)
873{
874 return 0;
875}
876
877static inline
878void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
879 bool on_exit __maybe_unused)
880{
881}
882
883static inline
884int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
885{
886 return 0;
887}
888
889static inline
890int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
891{
892 return 0;
893}
894
895static int record__auxtrace_init(struct record *rec __maybe_unused)
896{
897 return 0;
898}
899
900#endif
901
902static int record__config_text_poke(struct evlist *evlist)
903{
904 struct evsel *evsel;
905
906 /* Nothing to do if text poke is already configured */
907 evlist__for_each_entry(evlist, evsel) {
908 if (evsel->core.attr.text_poke)
909 return 0;
910 }
911
912 evsel = evlist__add_dummy_on_all_cpus(evlist);
913 if (!evsel)
914 return -ENOMEM;
915
916 evsel->core.attr.text_poke = 1;
917 evsel->core.attr.ksymbol = 1;
918 evsel->immediate = true;
919 evsel__set_sample_bit(evsel, TIME);
920
921 return 0;
922}
923
924static int record__config_off_cpu(struct record *rec)
925{
926 return off_cpu_prepare(rec->evlist, &rec->opts.target, &rec->opts);
927}
928
929static bool record__tracking_system_wide(struct record *rec)
930{
931 struct evlist *evlist = rec->evlist;
932 struct evsel *evsel;
933
934 /*
935 * If non-dummy evsel exists, system_wide sideband is need to
936 * help parse sample information.
937 * For example, PERF_EVENT_MMAP event to help parse symbol,
938 * and PERF_EVENT_COMM event to help parse task executable name.
939 */
940 evlist__for_each_entry(evlist, evsel) {
941 if (!evsel__is_dummy_event(evsel))
942 return true;
943 }
944
945 return false;
946}
947
948static int record__config_tracking_events(struct record *rec)
949{
950 struct record_opts *opts = &rec->opts;
951 struct evlist *evlist = rec->evlist;
952 bool system_wide = false;
953 struct evsel *evsel;
954
955 /*
956 * For initial_delay, system wide or a hybrid system, we need to add
957 * tracking event so that we can track PERF_RECORD_MMAP to cover the
958 * delay of waiting or event synthesis.
959 */
960 if (opts->target.initial_delay || target__has_cpu(&opts->target) ||
961 perf_pmus__num_core_pmus() > 1) {
962
963 /*
964 * User space tasks can migrate between CPUs, so when tracing
965 * selected CPUs, sideband for all CPUs is still needed.
966 */
967 if (!!opts->target.cpu_list && record__tracking_system_wide(rec))
968 system_wide = true;
969
970 evsel = evlist__findnew_tracking_event(evlist, system_wide);
971 if (!evsel)
972 return -ENOMEM;
973
974 /*
975 * Enable the tracking event when the process is forked for
976 * initial_delay, immediately for system wide.
977 */
978 if (opts->target.initial_delay && !evsel->immediate &&
979 !target__has_cpu(&opts->target))
980 evsel->core.attr.enable_on_exec = 1;
981 else
982 evsel->immediate = 1;
983 }
984
985 return 0;
986}
987
988static bool record__kcore_readable(struct machine *machine)
989{
990 char kcore[PATH_MAX];
991 int fd;
992
993 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
994
995 fd = open(kcore, O_RDONLY);
996 if (fd < 0)
997 return false;
998
999 close(fd);
1000
1001 return true;
1002}
1003
1004static int record__kcore_copy(struct machine *machine, struct perf_data *data)
1005{
1006 char from_dir[PATH_MAX];
1007 char kcore_dir[PATH_MAX];
1008 int ret;
1009
1010 snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
1011
1012 ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
1013 if (ret)
1014 return ret;
1015
1016 return kcore_copy(from_dir, kcore_dir);
1017}
1018
1019static void record__thread_data_init_pipes(struct record_thread *thread_data)
1020{
1021 thread_data->pipes.msg[0] = -1;
1022 thread_data->pipes.msg[1] = -1;
1023 thread_data->pipes.ack[0] = -1;
1024 thread_data->pipes.ack[1] = -1;
1025}
1026
1027static int record__thread_data_open_pipes(struct record_thread *thread_data)
1028{
1029 if (pipe(thread_data->pipes.msg))
1030 return -EINVAL;
1031
1032 if (pipe(thread_data->pipes.ack)) {
1033 close(thread_data->pipes.msg[0]);
1034 thread_data->pipes.msg[0] = -1;
1035 close(thread_data->pipes.msg[1]);
1036 thread_data->pipes.msg[1] = -1;
1037 return -EINVAL;
1038 }
1039
1040 pr_debug2("thread_data[%p]: msg=[%d,%d], ack=[%d,%d]\n", thread_data,
1041 thread_data->pipes.msg[0], thread_data->pipes.msg[1],
1042 thread_data->pipes.ack[0], thread_data->pipes.ack[1]);
1043
1044 return 0;
1045}
1046
1047static void record__thread_data_close_pipes(struct record_thread *thread_data)
1048{
1049 if (thread_data->pipes.msg[0] != -1) {
1050 close(thread_data->pipes.msg[0]);
1051 thread_data->pipes.msg[0] = -1;
1052 }
1053 if (thread_data->pipes.msg[1] != -1) {
1054 close(thread_data->pipes.msg[1]);
1055 thread_data->pipes.msg[1] = -1;
1056 }
1057 if (thread_data->pipes.ack[0] != -1) {
1058 close(thread_data->pipes.ack[0]);
1059 thread_data->pipes.ack[0] = -1;
1060 }
1061 if (thread_data->pipes.ack[1] != -1) {
1062 close(thread_data->pipes.ack[1]);
1063 thread_data->pipes.ack[1] = -1;
1064 }
1065}
1066
1067static bool evlist__per_thread(struct evlist *evlist)
1068{
1069 return cpu_map__is_dummy(evlist->core.user_requested_cpus);
1070}
1071
1072static int record__thread_data_init_maps(struct record_thread *thread_data, struct evlist *evlist)
1073{
1074 int m, tm, nr_mmaps = evlist->core.nr_mmaps;
1075 struct mmap *mmap = evlist->mmap;
1076 struct mmap *overwrite_mmap = evlist->overwrite_mmap;
1077 struct perf_cpu_map *cpus = evlist->core.all_cpus;
1078 bool per_thread = evlist__per_thread(evlist);
1079
1080 if (per_thread)
1081 thread_data->nr_mmaps = nr_mmaps;
1082 else
1083 thread_data->nr_mmaps = bitmap_weight(thread_data->mask->maps.bits,
1084 thread_data->mask->maps.nbits);
1085 if (mmap) {
1086 thread_data->maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *));
1087 if (!thread_data->maps)
1088 return -ENOMEM;
1089 }
1090 if (overwrite_mmap) {
1091 thread_data->overwrite_maps = zalloc(thread_data->nr_mmaps * sizeof(struct mmap *));
1092 if (!thread_data->overwrite_maps) {
1093 zfree(&thread_data->maps);
1094 return -ENOMEM;
1095 }
1096 }
1097 pr_debug2("thread_data[%p]: nr_mmaps=%d, maps=%p, ow_maps=%p\n", thread_data,
1098 thread_data->nr_mmaps, thread_data->maps, thread_data->overwrite_maps);
1099
1100 for (m = 0, tm = 0; m < nr_mmaps && tm < thread_data->nr_mmaps; m++) {
1101 if (per_thread ||
1102 test_bit(perf_cpu_map__cpu(cpus, m).cpu, thread_data->mask->maps.bits)) {
1103 if (thread_data->maps) {
1104 thread_data->maps[tm] = &mmap[m];
1105 pr_debug2("thread_data[%p]: cpu%d: maps[%d] -> mmap[%d]\n",
1106 thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m);
1107 }
1108 if (thread_data->overwrite_maps) {
1109 thread_data->overwrite_maps[tm] = &overwrite_mmap[m];
1110 pr_debug2("thread_data[%p]: cpu%d: ow_maps[%d] -> ow_mmap[%d]\n",
1111 thread_data, perf_cpu_map__cpu(cpus, m).cpu, tm, m);
1112 }
1113 tm++;
1114 }
1115 }
1116
1117 return 0;
1118}
1119
1120static int record__thread_data_init_pollfd(struct record_thread *thread_data, struct evlist *evlist)
1121{
1122 int f, tm, pos;
1123 struct mmap *map, *overwrite_map;
1124
1125 fdarray__init(&thread_data->pollfd, 64);
1126
1127 for (tm = 0; tm < thread_data->nr_mmaps; tm++) {
1128 map = thread_data->maps ? thread_data->maps[tm] : NULL;
1129 overwrite_map = thread_data->overwrite_maps ?
1130 thread_data->overwrite_maps[tm] : NULL;
1131
1132 for (f = 0; f < evlist->core.pollfd.nr; f++) {
1133 void *ptr = evlist->core.pollfd.priv[f].ptr;
1134
1135 if ((map && ptr == map) || (overwrite_map && ptr == overwrite_map)) {
1136 pos = fdarray__dup_entry_from(&thread_data->pollfd, f,
1137 &evlist->core.pollfd);
1138 if (pos < 0)
1139 return pos;
1140 pr_debug2("thread_data[%p]: pollfd[%d] <- event_fd=%d\n",
1141 thread_data, pos, evlist->core.pollfd.entries[f].fd);
1142 }
1143 }
1144 }
1145
1146 return 0;
1147}
1148
1149static void record__free_thread_data(struct record *rec)
1150{
1151 int t;
1152 struct record_thread *thread_data = rec->thread_data;
1153
1154 if (thread_data == NULL)
1155 return;
1156
1157 for (t = 0; t < rec->nr_threads; t++) {
1158 record__thread_data_close_pipes(&thread_data[t]);
1159 zfree(&thread_data[t].maps);
1160 zfree(&thread_data[t].overwrite_maps);
1161 fdarray__exit(&thread_data[t].pollfd);
1162 }
1163
1164 zfree(&rec->thread_data);
1165}
1166
1167static int record__map_thread_evlist_pollfd_indexes(struct record *rec,
1168 int evlist_pollfd_index,
1169 int thread_pollfd_index)
1170{
1171 size_t x = rec->index_map_cnt;
1172
1173 if (realloc_array_as_needed(rec->index_map, rec->index_map_sz, x, NULL))
1174 return -ENOMEM;
1175 rec->index_map[x].evlist_pollfd_index = evlist_pollfd_index;
1176 rec->index_map[x].thread_pollfd_index = thread_pollfd_index;
1177 rec->index_map_cnt += 1;
1178 return 0;
1179}
1180
1181static int record__update_evlist_pollfd_from_thread(struct record *rec,
1182 struct evlist *evlist,
1183 struct record_thread *thread_data)
1184{
1185 struct pollfd *e_entries = evlist->core.pollfd.entries;
1186 struct pollfd *t_entries = thread_data->pollfd.entries;
1187 int err = 0;
1188 size_t i;
1189
1190 for (i = 0; i < rec->index_map_cnt; i++) {
1191 int e_pos = rec->index_map[i].evlist_pollfd_index;
1192 int t_pos = rec->index_map[i].thread_pollfd_index;
1193
1194 if (e_entries[e_pos].fd != t_entries[t_pos].fd ||
1195 e_entries[e_pos].events != t_entries[t_pos].events) {
1196 pr_err("Thread and evlist pollfd index mismatch\n");
1197 err = -EINVAL;
1198 continue;
1199 }
1200 e_entries[e_pos].revents = t_entries[t_pos].revents;
1201 }
1202 return err;
1203}
1204
1205static int record__dup_non_perf_events(struct record *rec,
1206 struct evlist *evlist,
1207 struct record_thread *thread_data)
1208{
1209 struct fdarray *fda = &evlist->core.pollfd;
1210 int i, ret;
1211
1212 for (i = 0; i < fda->nr; i++) {
1213 if (!(fda->priv[i].flags & fdarray_flag__non_perf_event))
1214 continue;
1215 ret = fdarray__dup_entry_from(&thread_data->pollfd, i, fda);
1216 if (ret < 0) {
1217 pr_err("Failed to duplicate descriptor in main thread pollfd\n");
1218 return ret;
1219 }
1220 pr_debug2("thread_data[%p]: pollfd[%d] <- non_perf_event fd=%d\n",
1221 thread_data, ret, fda->entries[i].fd);
1222 ret = record__map_thread_evlist_pollfd_indexes(rec, i, ret);
1223 if (ret < 0) {
1224 pr_err("Failed to map thread and evlist pollfd indexes\n");
1225 return ret;
1226 }
1227 }
1228 return 0;
1229}
1230
1231static int record__alloc_thread_data(struct record *rec, struct evlist *evlist)
1232{
1233 int t, ret;
1234 struct record_thread *thread_data;
1235
1236 rec->thread_data = zalloc(rec->nr_threads * sizeof(*(rec->thread_data)));
1237 if (!rec->thread_data) {
1238 pr_err("Failed to allocate thread data\n");
1239 return -ENOMEM;
1240 }
1241 thread_data = rec->thread_data;
1242
1243 for (t = 0; t < rec->nr_threads; t++)
1244 record__thread_data_init_pipes(&thread_data[t]);
1245
1246 for (t = 0; t < rec->nr_threads; t++) {
1247 thread_data[t].rec = rec;
1248 thread_data[t].mask = &rec->thread_masks[t];
1249 ret = record__thread_data_init_maps(&thread_data[t], evlist);
1250 if (ret) {
1251 pr_err("Failed to initialize thread[%d] maps\n", t);
1252 goto out_free;
1253 }
1254 ret = record__thread_data_init_pollfd(&thread_data[t], evlist);
1255 if (ret) {
1256 pr_err("Failed to initialize thread[%d] pollfd\n", t);
1257 goto out_free;
1258 }
1259 if (t) {
1260 thread_data[t].tid = -1;
1261 ret = record__thread_data_open_pipes(&thread_data[t]);
1262 if (ret) {
1263 pr_err("Failed to open thread[%d] communication pipes\n", t);
1264 goto out_free;
1265 }
1266 ret = fdarray__add(&thread_data[t].pollfd, thread_data[t].pipes.msg[0],
1267 POLLIN | POLLERR | POLLHUP, fdarray_flag__nonfilterable);
1268 if (ret < 0) {
1269 pr_err("Failed to add descriptor to thread[%d] pollfd\n", t);
1270 goto out_free;
1271 }
1272 thread_data[t].ctlfd_pos = ret;
1273 pr_debug2("thread_data[%p]: pollfd[%d] <- ctl_fd=%d\n",
1274 thread_data, thread_data[t].ctlfd_pos,
1275 thread_data[t].pipes.msg[0]);
1276 } else {
1277 thread_data[t].tid = gettid();
1278
1279 ret = record__dup_non_perf_events(rec, evlist, &thread_data[t]);
1280 if (ret < 0)
1281 goto out_free;
1282
1283 thread_data[t].ctlfd_pos = -1; /* Not used */
1284 }
1285 }
1286
1287 return 0;
1288
1289out_free:
1290 record__free_thread_data(rec);
1291
1292 return ret;
1293}
1294
1295static int record__mmap_evlist(struct record *rec,
1296 struct evlist *evlist)
1297{
1298 int i, ret;
1299 struct record_opts *opts = &rec->opts;
1300 bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
1301 opts->auxtrace_sample_mode;
1302 char msg[512];
1303
1304 if (opts->affinity != PERF_AFFINITY_SYS)
1305 cpu__setup_cpunode_map();
1306
1307 if (evlist__mmap_ex(evlist, opts->mmap_pages,
1308 opts->auxtrace_mmap_pages,
1309 auxtrace_overwrite,
1310 opts->nr_cblocks, opts->affinity,
1311 opts->mmap_flush, opts->comp_level) < 0) {
1312 if (errno == EPERM) {
1313 pr_err("Permission error mapping pages.\n"
1314 "Consider increasing "
1315 "/proc/sys/kernel/perf_event_mlock_kb,\n"
1316 "or try again with a smaller value of -m/--mmap_pages.\n"
1317 "(current value: %u,%u)\n",
1318 opts->mmap_pages, opts->auxtrace_mmap_pages);
1319 return -errno;
1320 } else {
1321 pr_err("failed to mmap with %d (%s)\n", errno,
1322 str_error_r(errno, msg, sizeof(msg)));
1323 if (errno)
1324 return -errno;
1325 else
1326 return -EINVAL;
1327 }
1328 }
1329
1330 if (evlist__initialize_ctlfd(evlist, opts->ctl_fd, opts->ctl_fd_ack))
1331 return -1;
1332
1333 ret = record__alloc_thread_data(rec, evlist);
1334 if (ret)
1335 return ret;
1336
1337 if (record__threads_enabled(rec)) {
1338 ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
1339 if (ret) {
1340 pr_err("Failed to create data directory: %s\n", strerror(-ret));
1341 return ret;
1342 }
1343 for (i = 0; i < evlist->core.nr_mmaps; i++) {
1344 if (evlist->mmap)
1345 evlist->mmap[i].file = &rec->data.dir.files[i];
1346 if (evlist->overwrite_mmap)
1347 evlist->overwrite_mmap[i].file = &rec->data.dir.files[i];
1348 }
1349 }
1350
1351 return 0;
1352}
1353
1354static int record__mmap(struct record *rec)
1355{
1356 return record__mmap_evlist(rec, rec->evlist);
1357}
1358
1359static int record__open(struct record *rec)
1360{
1361 char msg[BUFSIZ];
1362 struct evsel *pos;
1363 struct evlist *evlist = rec->evlist;
1364 struct perf_session *session = rec->session;
1365 struct record_opts *opts = &rec->opts;
1366 int rc = 0;
1367
1368 evlist__for_each_entry(evlist, pos) {
1369try_again:
1370 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
1371 if (evsel__fallback(pos, &opts->target, errno, msg, sizeof(msg))) {
1372 if (verbose > 0)
1373 ui__warning("%s\n", msg);
1374 goto try_again;
1375 }
1376 if ((errno == EINVAL || errno == EBADF) &&
1377 pos->core.leader != &pos->core &&
1378 pos->weak_group) {
1379 pos = evlist__reset_weak_group(evlist, pos, true);
1380 goto try_again;
1381 }
1382 rc = -errno;
1383 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
1384 ui__error("%s\n", msg);
1385 goto out;
1386 }
1387
1388 pos->supported = true;
1389 }
1390
1391 if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
1392 pr_warning(
1393"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
1394"check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
1395"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
1396"file is not found in the buildid cache or in the vmlinux path.\n\n"
1397"Samples in kernel modules won't be resolved at all.\n\n"
1398"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1399"even with a suitable vmlinux or kallsyms file.\n\n");
1400 }
1401
1402 if (evlist__apply_filters(evlist, &pos, &opts->target)) {
1403 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
1404 pos->filter ?: "BPF", evsel__name(pos), errno,
1405 str_error_r(errno, msg, sizeof(msg)));
1406 rc = -1;
1407 goto out;
1408 }
1409
1410 rc = record__mmap(rec);
1411 if (rc)
1412 goto out;
1413
1414 session->evlist = evlist;
1415 perf_session__set_id_hdr_size(session);
1416out:
1417 return rc;
1418}
1419
1420static void set_timestamp_boundary(struct record *rec, u64 sample_time)
1421{
1422 if (rec->evlist->first_sample_time == 0)
1423 rec->evlist->first_sample_time = sample_time;
1424
1425 if (sample_time)
1426 rec->evlist->last_sample_time = sample_time;
1427}
1428
1429static int process_sample_event(const struct perf_tool *tool,
1430 union perf_event *event,
1431 struct perf_sample *sample,
1432 struct evsel *evsel,
1433 struct machine *machine)
1434{
1435 struct record *rec = container_of(tool, struct record, tool);
1436
1437 set_timestamp_boundary(rec, sample->time);
1438
1439 if (rec->buildid_all)
1440 return 0;
1441
1442 rec->samples++;
1443 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
1444}
1445
1446static int process_buildids(struct record *rec)
1447{
1448 struct perf_session *session = rec->session;
1449
1450 if (perf_data__size(&rec->data) == 0)
1451 return 0;
1452
1453 /*
1454 * During this process, it'll load kernel map and replace the
1455 * dso->long_name to a real pathname it found. In this case
1456 * we prefer the vmlinux path like
1457 * /lib/modules/3.16.4/build/vmlinux
1458 *
1459 * rather than build-id path (in debug directory).
1460 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1461 */
1462 symbol_conf.ignore_vmlinux_buildid = true;
1463
1464 /*
1465 * If --buildid-all is given, it marks all DSO regardless of hits,
1466 * so no need to process samples. But if timestamp_boundary is enabled,
1467 * it still needs to walk on all samples to get the timestamps of
1468 * first/last samples.
1469 */
1470 if (rec->buildid_all && !rec->timestamp_boundary)
1471 rec->tool.sample = process_event_sample_stub;
1472
1473 return perf_session__process_events(session);
1474}
1475
1476static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1477{
1478 int err;
1479 struct perf_tool *tool = data;
1480 /*
1481 *As for guest kernel when processing subcommand record&report,
1482 *we arrange module mmap prior to guest kernel mmap and trigger
1483 *a preload dso because default guest module symbols are loaded
1484 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1485 *method is used to avoid symbol missing when the first addr is
1486 *in module instead of in guest kernel.
1487 */
1488 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1489 machine);
1490 if (err < 0)
1491 pr_err("Couldn't record guest kernel [%d]'s reference"
1492 " relocation symbol.\n", machine->pid);
1493
1494 /*
1495 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1496 * have no _text sometimes.
1497 */
1498 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1499 machine);
1500 if (err < 0)
1501 pr_err("Couldn't record guest kernel [%d]'s reference"
1502 " relocation symbol.\n", machine->pid);
1503}
1504
1505static struct perf_event_header finished_round_event = {
1506 .size = sizeof(struct perf_event_header),
1507 .type = PERF_RECORD_FINISHED_ROUND,
1508};
1509
1510static struct perf_event_header finished_init_event = {
1511 .size = sizeof(struct perf_event_header),
1512 .type = PERF_RECORD_FINISHED_INIT,
1513};
1514
1515static void record__adjust_affinity(struct record *rec, struct mmap *map)
1516{
1517 if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1518 !bitmap_equal(thread->mask->affinity.bits, map->affinity_mask.bits,
1519 thread->mask->affinity.nbits)) {
1520 bitmap_zero(thread->mask->affinity.bits, thread->mask->affinity.nbits);
1521 bitmap_or(thread->mask->affinity.bits, thread->mask->affinity.bits,
1522 map->affinity_mask.bits, thread->mask->affinity.nbits);
1523 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity),
1524 (cpu_set_t *)thread->mask->affinity.bits);
1525 if (verbose == 2) {
1526 pr_debug("threads[%d]: running on cpu%d: ", thread->tid, sched_getcpu());
1527 mmap_cpu_mask__scnprintf(&thread->mask->affinity, "affinity");
1528 }
1529 }
1530}
1531
1532static size_t process_comp_header(void *record, size_t increment)
1533{
1534 struct perf_record_compressed *event = record;
1535 size_t size = sizeof(*event);
1536
1537 if (increment) {
1538 event->header.size += increment;
1539 return increment;
1540 }
1541
1542 event->header.type = PERF_RECORD_COMPRESSED;
1543 event->header.size = size;
1544
1545 return size;
1546}
1547
1548static ssize_t zstd_compress(struct perf_session *session, struct mmap *map,
1549 void *dst, size_t dst_size, void *src, size_t src_size)
1550{
1551 ssize_t compressed;
1552 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1553 struct zstd_data *zstd_data = &session->zstd_data;
1554
1555 if (map && map->file)
1556 zstd_data = &map->zstd_data;
1557
1558 compressed = zstd_compress_stream_to_records(zstd_data, dst, dst_size, src, src_size,
1559 max_record_size, process_comp_header);
1560 if (compressed < 0)
1561 return compressed;
1562
1563 if (map && map->file) {
1564 thread->bytes_transferred += src_size;
1565 thread->bytes_compressed += compressed;
1566 } else {
1567 session->bytes_transferred += src_size;
1568 session->bytes_compressed += compressed;
1569 }
1570
1571 return compressed;
1572}
1573
1574static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1575 bool overwrite, bool synch)
1576{
1577 u64 bytes_written = rec->bytes_written;
1578 int i;
1579 int rc = 0;
1580 int nr_mmaps;
1581 struct mmap **maps;
1582 int trace_fd = rec->data.file.fd;
1583 off_t off = 0;
1584
1585 if (!evlist)
1586 return 0;
1587
1588 nr_mmaps = thread->nr_mmaps;
1589 maps = overwrite ? thread->overwrite_maps : thread->maps;
1590
1591 if (!maps)
1592 return 0;
1593
1594 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1595 return 0;
1596
1597 if (record__aio_enabled(rec))
1598 off = record__aio_get_pos(trace_fd);
1599
1600 for (i = 0; i < nr_mmaps; i++) {
1601 u64 flush = 0;
1602 struct mmap *map = maps[i];
1603
1604 if (map->core.base) {
1605 record__adjust_affinity(rec, map);
1606 if (synch) {
1607 flush = map->core.flush;
1608 map->core.flush = 1;
1609 }
1610 if (!record__aio_enabled(rec)) {
1611 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1612 if (synch)
1613 map->core.flush = flush;
1614 rc = -1;
1615 goto out;
1616 }
1617 } else {
1618 if (record__aio_push(rec, map, &off) < 0) {
1619 record__aio_set_pos(trace_fd, off);
1620 if (synch)
1621 map->core.flush = flush;
1622 rc = -1;
1623 goto out;
1624 }
1625 }
1626 if (synch)
1627 map->core.flush = flush;
1628 }
1629
1630 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1631 !rec->opts.auxtrace_sample_mode &&
1632 record__auxtrace_mmap_read(rec, map) != 0) {
1633 rc = -1;
1634 goto out;
1635 }
1636 }
1637
1638 if (record__aio_enabled(rec))
1639 record__aio_set_pos(trace_fd, off);
1640
1641 /*
1642 * Mark the round finished in case we wrote
1643 * at least one event.
1644 *
1645 * No need for round events in directory mode,
1646 * because per-cpu maps and files have data
1647 * sorted by kernel.
1648 */
1649 if (!record__threads_enabled(rec) && bytes_written != rec->bytes_written)
1650 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1651
1652 if (overwrite)
1653 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1654out:
1655 return rc;
1656}
1657
1658static int record__mmap_read_all(struct record *rec, bool synch)
1659{
1660 int err;
1661
1662 err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1663 if (err)
1664 return err;
1665
1666 return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1667}
1668
1669static void record__thread_munmap_filtered(struct fdarray *fda, int fd,
1670 void *arg __maybe_unused)
1671{
1672 struct perf_mmap *map = fda->priv[fd].ptr;
1673
1674 if (map)
1675 perf_mmap__put(map);
1676}
1677
1678static void *record__thread(void *arg)
1679{
1680 enum thread_msg msg = THREAD_MSG__READY;
1681 bool terminate = false;
1682 struct fdarray *pollfd;
1683 int err, ctlfd_pos;
1684
1685 thread = arg;
1686 thread->tid = gettid();
1687
1688 err = write(thread->pipes.ack[1], &msg, sizeof(msg));
1689 if (err == -1)
1690 pr_warning("threads[%d]: failed to notify on start: %s\n",
1691 thread->tid, strerror(errno));
1692
1693 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
1694
1695 pollfd = &thread->pollfd;
1696 ctlfd_pos = thread->ctlfd_pos;
1697
1698 for (;;) {
1699 unsigned long long hits = thread->samples;
1700
1701 if (record__mmap_read_all(thread->rec, false) < 0 || terminate)
1702 break;
1703
1704 if (hits == thread->samples) {
1705
1706 err = fdarray__poll(pollfd, -1);
1707 /*
1708 * Propagate error, only if there's any. Ignore positive
1709 * number of returned events and interrupt error.
1710 */
1711 if (err > 0 || (err < 0 && errno == EINTR))
1712 err = 0;
1713 thread->waking++;
1714
1715 if (fdarray__filter(pollfd, POLLERR | POLLHUP,
1716 record__thread_munmap_filtered, NULL) == 0)
1717 break;
1718 }
1719
1720 if (pollfd->entries[ctlfd_pos].revents & POLLHUP) {
1721 terminate = true;
1722 close(thread->pipes.msg[0]);
1723 thread->pipes.msg[0] = -1;
1724 pollfd->entries[ctlfd_pos].fd = -1;
1725 pollfd->entries[ctlfd_pos].events = 0;
1726 }
1727
1728 pollfd->entries[ctlfd_pos].revents = 0;
1729 }
1730 record__mmap_read_all(thread->rec, true);
1731
1732 err = write(thread->pipes.ack[1], &msg, sizeof(msg));
1733 if (err == -1)
1734 pr_warning("threads[%d]: failed to notify on termination: %s\n",
1735 thread->tid, strerror(errno));
1736
1737 return NULL;
1738}
1739
1740static void record__init_features(struct record *rec)
1741{
1742 struct perf_session *session = rec->session;
1743 int feat;
1744
1745 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1746 perf_header__set_feat(&session->header, feat);
1747
1748 if (rec->no_buildid)
1749 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1750
1751#ifdef HAVE_LIBTRACEEVENT
1752 if (!have_tracepoints(&rec->evlist->core.entries))
1753 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1754#endif
1755
1756 if (!rec->opts.branch_stack)
1757 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1758
1759 if (!rec->opts.full_auxtrace)
1760 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1761
1762 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1763 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1764
1765 if (!rec->opts.use_clockid)
1766 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1767
1768 if (!record__threads_enabled(rec))
1769 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1770
1771 if (!record__comp_enabled(rec))
1772 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1773
1774 perf_header__clear_feat(&session->header, HEADER_STAT);
1775}
1776
1777static void
1778record__finish_output(struct record *rec)
1779{
1780 int i;
1781 struct perf_data *data = &rec->data;
1782 int fd = perf_data__fd(data);
1783
1784 if (data->is_pipe) {
1785 /* Just to display approx. size */
1786 data->file.size = rec->bytes_written;
1787 return;
1788 }
1789
1790 rec->session->header.data_size += rec->bytes_written;
1791 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1792 if (record__threads_enabled(rec)) {
1793 for (i = 0; i < data->dir.nr; i++)
1794 data->dir.files[i].size = lseek(data->dir.files[i].fd, 0, SEEK_CUR);
1795 }
1796
1797 if (!rec->no_buildid) {
1798 process_buildids(rec);
1799
1800 if (rec->buildid_all)
1801 perf_session__dsos_hit_all(rec->session);
1802 }
1803 perf_session__write_header(rec->session, rec->evlist, fd, true);
1804
1805 return;
1806}
1807
1808static int record__synthesize_workload(struct record *rec, bool tail)
1809{
1810 int err;
1811 struct perf_thread_map *thread_map;
1812 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP;
1813
1814 if (rec->opts.tail_synthesize != tail)
1815 return 0;
1816
1817 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1818 if (thread_map == NULL)
1819 return -1;
1820
1821 err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1822 process_synthesized_event,
1823 &rec->session->machines.host,
1824 needs_mmap,
1825 rec->opts.sample_address);
1826 perf_thread_map__put(thread_map);
1827 return err;
1828}
1829
1830static int write_finished_init(struct record *rec, bool tail)
1831{
1832 if (rec->opts.tail_synthesize != tail)
1833 return 0;
1834
1835 return record__write(rec, NULL, &finished_init_event, sizeof(finished_init_event));
1836}
1837
1838static int record__synthesize(struct record *rec, bool tail);
1839
1840static int
1841record__switch_output(struct record *rec, bool at_exit)
1842{
1843 struct perf_data *data = &rec->data;
1844 char *new_filename = NULL;
1845 int fd, err;
1846
1847 /* Same Size: "2015122520103046"*/
1848 char timestamp[] = "InvalidTimestamp";
1849
1850 record__aio_mmap_read_sync(rec);
1851
1852 write_finished_init(rec, true);
1853
1854 record__synthesize(rec, true);
1855 if (target__none(&rec->opts.target))
1856 record__synthesize_workload(rec, true);
1857
1858 rec->samples = 0;
1859 record__finish_output(rec);
1860 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1861 if (err) {
1862 pr_err("Failed to get current timestamp\n");
1863 return -EINVAL;
1864 }
1865
1866 fd = perf_data__switch(data, timestamp,
1867 rec->session->header.data_offset,
1868 at_exit, &new_filename);
1869 if (fd >= 0 && !at_exit) {
1870 rec->bytes_written = 0;
1871 rec->session->header.data_size = 0;
1872 }
1873
1874 if (!quiet) {
1875 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1876 data->path, timestamp);
1877 }
1878
1879 if (rec->switch_output.num_files) {
1880 int n = rec->switch_output.cur_file + 1;
1881
1882 if (n >= rec->switch_output.num_files)
1883 n = 0;
1884 rec->switch_output.cur_file = n;
1885 if (rec->switch_output.filenames[n]) {
1886 remove(rec->switch_output.filenames[n]);
1887 zfree(&rec->switch_output.filenames[n]);
1888 }
1889 rec->switch_output.filenames[n] = new_filename;
1890 } else {
1891 free(new_filename);
1892 }
1893
1894 /* Output tracking events */
1895 if (!at_exit) {
1896 record__synthesize(rec, false);
1897
1898 /*
1899 * In 'perf record --switch-output' without -a,
1900 * record__synthesize() in record__switch_output() won't
1901 * generate tracking events because there's no thread_map
1902 * in evlist. Which causes newly created perf.data doesn't
1903 * contain map and comm information.
1904 * Create a fake thread_map and directly call
1905 * perf_event__synthesize_thread_map() for those events.
1906 */
1907 if (target__none(&rec->opts.target))
1908 record__synthesize_workload(rec, false);
1909 write_finished_init(rec, false);
1910 }
1911 return fd;
1912}
1913
1914static void __record__save_lost_samples(struct record *rec, struct evsel *evsel,
1915 struct perf_record_lost_samples *lost,
1916 int cpu_idx, int thread_idx, u64 lost_count,
1917 u16 misc_flag)
1918{
1919 struct perf_sample_id *sid;
1920 struct perf_sample sample = {};
1921 int id_hdr_size;
1922
1923 lost->lost = lost_count;
1924 if (evsel->core.ids) {
1925 sid = xyarray__entry(evsel->core.sample_id, cpu_idx, thread_idx);
1926 sample.id = sid->id;
1927 }
1928
1929 id_hdr_size = perf_event__synthesize_id_sample((void *)(lost + 1),
1930 evsel->core.attr.sample_type, &sample);
1931 lost->header.size = sizeof(*lost) + id_hdr_size;
1932 lost->header.misc = misc_flag;
1933 record__write(rec, NULL, lost, lost->header.size);
1934}
1935
1936static void record__read_lost_samples(struct record *rec)
1937{
1938 struct perf_session *session = rec->session;
1939 struct perf_record_lost_samples_and_ids lost;
1940 struct evsel *evsel;
1941
1942 /* there was an error during record__open */
1943 if (session->evlist == NULL)
1944 return;
1945
1946 evlist__for_each_entry(session->evlist, evsel) {
1947 struct xyarray *xy = evsel->core.sample_id;
1948 u64 lost_count;
1949
1950 if (xy == NULL || evsel->core.fd == NULL)
1951 continue;
1952 if (xyarray__max_x(evsel->core.fd) != xyarray__max_x(xy) ||
1953 xyarray__max_y(evsel->core.fd) != xyarray__max_y(xy)) {
1954 pr_debug("Unmatched FD vs. sample ID: skip reading LOST count\n");
1955 continue;
1956 }
1957
1958 for (int x = 0; x < xyarray__max_x(xy); x++) {
1959 for (int y = 0; y < xyarray__max_y(xy); y++) {
1960 struct perf_counts_values count;
1961
1962 if (perf_evsel__read(&evsel->core, x, y, &count) < 0) {
1963 pr_debug("read LOST count failed\n");
1964 return;
1965 }
1966
1967 if (count.lost) {
1968 memset(&lost, 0, sizeof(lost));
1969 lost.lost.header.type = PERF_RECORD_LOST_SAMPLES;
1970 __record__save_lost_samples(rec, evsel, &lost.lost,
1971 x, y, count.lost, 0);
1972 }
1973 }
1974 }
1975
1976 lost_count = perf_bpf_filter__lost_count(evsel);
1977 if (lost_count) {
1978 memset(&lost, 0, sizeof(lost));
1979 lost.lost.header.type = PERF_RECORD_LOST_SAMPLES;
1980 __record__save_lost_samples(rec, evsel, &lost.lost, 0, 0, lost_count,
1981 PERF_RECORD_MISC_LOST_SAMPLES_BPF);
1982 }
1983 }
1984}
1985
1986static volatile sig_atomic_t workload_exec_errno;
1987
1988/*
1989 * evlist__prepare_workload will send a SIGUSR1
1990 * if the fork fails, since we asked by setting its
1991 * want_signal to true.
1992 */
1993static void workload_exec_failed_signal(int signo __maybe_unused,
1994 siginfo_t *info,
1995 void *ucontext __maybe_unused)
1996{
1997 workload_exec_errno = info->si_value.sival_int;
1998 done = 1;
1999 child_finished = 1;
2000}
2001
2002static void snapshot_sig_handler(int sig);
2003static void alarm_sig_handler(int sig);
2004
2005static const struct perf_event_mmap_page *evlist__pick_pc(struct evlist *evlist)
2006{
2007 if (evlist) {
2008 if (evlist->mmap && evlist->mmap[0].core.base)
2009 return evlist->mmap[0].core.base;
2010 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
2011 return evlist->overwrite_mmap[0].core.base;
2012 }
2013 return NULL;
2014}
2015
2016static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
2017{
2018 const struct perf_event_mmap_page *pc = evlist__pick_pc(rec->evlist);
2019 if (pc)
2020 return pc;
2021 return NULL;
2022}
2023
2024static int record__synthesize(struct record *rec, bool tail)
2025{
2026 struct perf_session *session = rec->session;
2027 struct machine *machine = &session->machines.host;
2028 struct perf_data *data = &rec->data;
2029 struct record_opts *opts = &rec->opts;
2030 struct perf_tool *tool = &rec->tool;
2031 int err = 0;
2032 event_op f = process_synthesized_event;
2033
2034 if (rec->opts.tail_synthesize != tail)
2035 return 0;
2036
2037 if (data->is_pipe) {
2038 err = perf_event__synthesize_for_pipe(tool, session, data,
2039 process_synthesized_event);
2040 if (err < 0)
2041 goto out;
2042
2043 rec->bytes_written += err;
2044 }
2045
2046 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
2047 process_synthesized_event, machine);
2048 if (err)
2049 goto out;
2050
2051 /* Synthesize id_index before auxtrace_info */
2052 err = perf_event__synthesize_id_index(tool,
2053 process_synthesized_event,
2054 session->evlist, machine);
2055 if (err)
2056 goto out;
2057
2058 if (rec->opts.full_auxtrace) {
2059 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
2060 session, process_synthesized_event);
2061 if (err)
2062 goto out;
2063 }
2064
2065 if (!evlist__exclude_kernel(rec->evlist)) {
2066 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
2067 machine);
2068 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
2069 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
2070 "Check /proc/kallsyms permission or run as root.\n");
2071
2072 err = perf_event__synthesize_modules(tool, process_synthesized_event,
2073 machine);
2074 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
2075 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
2076 "Check /proc/modules permission or run as root.\n");
2077 }
2078
2079 if (perf_guest) {
2080 machines__process_guests(&session->machines,
2081 perf_event__synthesize_guest_os, tool);
2082 }
2083
2084 err = perf_event__synthesize_extra_attr(&rec->tool,
2085 rec->evlist,
2086 process_synthesized_event,
2087 data->is_pipe);
2088 if (err)
2089 goto out;
2090
2091 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
2092 process_synthesized_event,
2093 NULL);
2094 if (err < 0) {
2095 pr_err("Couldn't synthesize thread map.\n");
2096 return err;
2097 }
2098
2099 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.all_cpus,
2100 process_synthesized_event, NULL);
2101 if (err < 0) {
2102 pr_err("Couldn't synthesize cpu map.\n");
2103 return err;
2104 }
2105
2106 err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
2107 machine, opts);
2108 if (err < 0) {
2109 pr_warning("Couldn't synthesize bpf events.\n");
2110 err = 0;
2111 }
2112
2113 if (rec->opts.synth & PERF_SYNTH_CGROUP) {
2114 err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
2115 machine);
2116 if (err < 0) {
2117 pr_warning("Couldn't synthesize cgroup events.\n");
2118 err = 0;
2119 }
2120 }
2121
2122 if (rec->opts.nr_threads_synthesize > 1) {
2123 mutex_init(&synth_lock);
2124 perf_set_multithreaded();
2125 f = process_locked_synthesized_event;
2126 }
2127
2128 if (rec->opts.synth & PERF_SYNTH_TASK) {
2129 bool needs_mmap = rec->opts.synth & PERF_SYNTH_MMAP;
2130
2131 err = __machine__synthesize_threads(machine, tool, &opts->target,
2132 rec->evlist->core.threads,
2133 f, needs_mmap, opts->sample_address,
2134 rec->opts.nr_threads_synthesize);
2135 }
2136
2137 if (rec->opts.nr_threads_synthesize > 1) {
2138 perf_set_singlethreaded();
2139 mutex_destroy(&synth_lock);
2140 }
2141
2142out:
2143 return err;
2144}
2145
2146static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
2147{
2148 struct record *rec = data;
2149 pthread_kill(rec->thread_id, SIGUSR2);
2150 return 0;
2151}
2152
2153static int record__setup_sb_evlist(struct record *rec)
2154{
2155 struct record_opts *opts = &rec->opts;
2156
2157 if (rec->sb_evlist != NULL) {
2158 /*
2159 * We get here if --switch-output-event populated the
2160 * sb_evlist, so associate a callback that will send a SIGUSR2
2161 * to the main thread.
2162 */
2163 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
2164 rec->thread_id = pthread_self();
2165 }
2166#ifdef HAVE_LIBBPF_SUPPORT
2167 if (!opts->no_bpf_event) {
2168 if (rec->sb_evlist == NULL) {
2169 rec->sb_evlist = evlist__new();
2170
2171 if (rec->sb_evlist == NULL) {
2172 pr_err("Couldn't create side band evlist.\n.");
2173 return -1;
2174 }
2175 }
2176
2177 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
2178 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
2179 return -1;
2180 }
2181 }
2182#endif
2183 if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
2184 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
2185 opts->no_bpf_event = true;
2186 }
2187
2188 return 0;
2189}
2190
2191static int record__init_clock(struct record *rec)
2192{
2193 struct perf_session *session = rec->session;
2194 struct timespec ref_clockid;
2195 struct timeval ref_tod;
2196 u64 ref;
2197
2198 if (!rec->opts.use_clockid)
2199 return 0;
2200
2201 if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
2202 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
2203
2204 session->header.env.clock.clockid = rec->opts.clockid;
2205
2206 if (gettimeofday(&ref_tod, NULL) != 0) {
2207 pr_err("gettimeofday failed, cannot set reference time.\n");
2208 return -1;
2209 }
2210
2211 if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
2212 pr_err("clock_gettime failed, cannot set reference time.\n");
2213 return -1;
2214 }
2215
2216 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
2217 (u64) ref_tod.tv_usec * NSEC_PER_USEC;
2218
2219 session->header.env.clock.tod_ns = ref;
2220
2221 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
2222 (u64) ref_clockid.tv_nsec;
2223
2224 session->header.env.clock.clockid_ns = ref;
2225 return 0;
2226}
2227
2228static void hit_auxtrace_snapshot_trigger(struct record *rec)
2229{
2230 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
2231 trigger_hit(&auxtrace_snapshot_trigger);
2232 auxtrace_record__snapshot_started = 1;
2233 if (auxtrace_record__snapshot_start(rec->itr))
2234 trigger_error(&auxtrace_snapshot_trigger);
2235 }
2236}
2237
2238static int record__terminate_thread(struct record_thread *thread_data)
2239{
2240 int err;
2241 enum thread_msg ack = THREAD_MSG__UNDEFINED;
2242 pid_t tid = thread_data->tid;
2243
2244 close(thread_data->pipes.msg[1]);
2245 thread_data->pipes.msg[1] = -1;
2246 err = read(thread_data->pipes.ack[0], &ack, sizeof(ack));
2247 if (err > 0)
2248 pr_debug2("threads[%d]: sent %s\n", tid, thread_msg_tags[ack]);
2249 else
2250 pr_warning("threads[%d]: failed to receive termination notification from %d\n",
2251 thread->tid, tid);
2252
2253 return 0;
2254}
2255
2256static int record__start_threads(struct record *rec)
2257{
2258 int t, tt, err, ret = 0, nr_threads = rec->nr_threads;
2259 struct record_thread *thread_data = rec->thread_data;
2260 sigset_t full, mask;
2261 pthread_t handle;
2262 pthread_attr_t attrs;
2263
2264 thread = &thread_data[0];
2265
2266 if (!record__threads_enabled(rec))
2267 return 0;
2268
2269 sigfillset(&full);
2270 if (sigprocmask(SIG_SETMASK, &full, &mask)) {
2271 pr_err("Failed to block signals on threads start: %s\n", strerror(errno));
2272 return -1;
2273 }
2274
2275 pthread_attr_init(&attrs);
2276 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
2277
2278 for (t = 1; t < nr_threads; t++) {
2279 enum thread_msg msg = THREAD_MSG__UNDEFINED;
2280
2281#ifdef HAVE_PTHREAD_ATTR_SETAFFINITY_NP
2282 pthread_attr_setaffinity_np(&attrs,
2283 MMAP_CPU_MASK_BYTES(&(thread_data[t].mask->affinity)),
2284 (cpu_set_t *)(thread_data[t].mask->affinity.bits));
2285#endif
2286 if (pthread_create(&handle, &attrs, record__thread, &thread_data[t])) {
2287 for (tt = 1; tt < t; tt++)
2288 record__terminate_thread(&thread_data[t]);
2289 pr_err("Failed to start threads: %s\n", strerror(errno));
2290 ret = -1;
2291 goto out_err;
2292 }
2293
2294 err = read(thread_data[t].pipes.ack[0], &msg, sizeof(msg));
2295 if (err > 0)
2296 pr_debug2("threads[%d]: sent %s\n", rec->thread_data[t].tid,
2297 thread_msg_tags[msg]);
2298 else
2299 pr_warning("threads[%d]: failed to receive start notification from %d\n",
2300 thread->tid, rec->thread_data[t].tid);
2301 }
2302
2303 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&thread->mask->affinity),
2304 (cpu_set_t *)thread->mask->affinity.bits);
2305
2306 pr_debug("threads[%d]: started on cpu%d\n", thread->tid, sched_getcpu());
2307
2308out_err:
2309 pthread_attr_destroy(&attrs);
2310
2311 if (sigprocmask(SIG_SETMASK, &mask, NULL)) {
2312 pr_err("Failed to unblock signals on threads start: %s\n", strerror(errno));
2313 ret = -1;
2314 }
2315
2316 return ret;
2317}
2318
2319static int record__stop_threads(struct record *rec)
2320{
2321 int t;
2322 struct record_thread *thread_data = rec->thread_data;
2323
2324 for (t = 1; t < rec->nr_threads; t++)
2325 record__terminate_thread(&thread_data[t]);
2326
2327 for (t = 0; t < rec->nr_threads; t++) {
2328 rec->samples += thread_data[t].samples;
2329 if (!record__threads_enabled(rec))
2330 continue;
2331 rec->session->bytes_transferred += thread_data[t].bytes_transferred;
2332 rec->session->bytes_compressed += thread_data[t].bytes_compressed;
2333 pr_debug("threads[%d]: samples=%lld, wakes=%ld, ", thread_data[t].tid,
2334 thread_data[t].samples, thread_data[t].waking);
2335 if (thread_data[t].bytes_transferred && thread_data[t].bytes_compressed)
2336 pr_debug("transferred=%" PRIu64 ", compressed=%" PRIu64 "\n",
2337 thread_data[t].bytes_transferred, thread_data[t].bytes_compressed);
2338 else
2339 pr_debug("written=%" PRIu64 "\n", thread_data[t].bytes_written);
2340 }
2341
2342 return 0;
2343}
2344
2345static unsigned long record__waking(struct record *rec)
2346{
2347 int t;
2348 unsigned long waking = 0;
2349 struct record_thread *thread_data = rec->thread_data;
2350
2351 for (t = 0; t < rec->nr_threads; t++)
2352 waking += thread_data[t].waking;
2353
2354 return waking;
2355}
2356
2357static int __cmd_record(struct record *rec, int argc, const char **argv)
2358{
2359 int err;
2360 int status = 0;
2361 const bool forks = argc > 0;
2362 struct perf_tool *tool = &rec->tool;
2363 struct record_opts *opts = &rec->opts;
2364 struct perf_data *data = &rec->data;
2365 struct perf_session *session;
2366 bool disabled = false, draining = false;
2367 int fd;
2368 float ratio = 0;
2369 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
2370
2371 atexit(record__sig_exit);
2372 signal(SIGCHLD, sig_handler);
2373 signal(SIGINT, sig_handler);
2374 signal(SIGTERM, sig_handler);
2375 signal(SIGSEGV, sigsegv_handler);
2376
2377 if (rec->opts.record_cgroup) {
2378#ifndef HAVE_FILE_HANDLE
2379 pr_err("cgroup tracking is not supported\n");
2380 return -1;
2381#endif
2382 }
2383
2384 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
2385 signal(SIGUSR2, snapshot_sig_handler);
2386 if (rec->opts.auxtrace_snapshot_mode)
2387 trigger_on(&auxtrace_snapshot_trigger);
2388 if (rec->switch_output.enabled)
2389 trigger_on(&switch_output_trigger);
2390 } else {
2391 signal(SIGUSR2, SIG_IGN);
2392 }
2393
2394 perf_tool__init(tool, /*ordered_events=*/true);
2395 tool->sample = process_sample_event;
2396 tool->fork = perf_event__process_fork;
2397 tool->exit = perf_event__process_exit;
2398 tool->comm = perf_event__process_comm;
2399 tool->namespaces = perf_event__process_namespaces;
2400 tool->mmap = build_id__process_mmap;
2401 tool->mmap2 = build_id__process_mmap2;
2402 tool->itrace_start = process_timestamp_boundary;
2403 tool->aux = process_timestamp_boundary;
2404 tool->namespace_events = rec->opts.record_namespaces;
2405 tool->cgroup_events = rec->opts.record_cgroup;
2406 session = perf_session__new(data, tool);
2407 if (IS_ERR(session)) {
2408 pr_err("Perf session creation failed.\n");
2409 return PTR_ERR(session);
2410 }
2411
2412 if (record__threads_enabled(rec)) {
2413 if (perf_data__is_pipe(&rec->data)) {
2414 pr_err("Parallel trace streaming is not available in pipe mode.\n");
2415 return -1;
2416 }
2417 if (rec->opts.full_auxtrace) {
2418 pr_err("Parallel trace streaming is not available in AUX area tracing mode.\n");
2419 return -1;
2420 }
2421 }
2422
2423 fd = perf_data__fd(data);
2424 rec->session = session;
2425
2426 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
2427 pr_err("Compression initialization failed.\n");
2428 return -1;
2429 }
2430#ifdef HAVE_EVENTFD_SUPPORT
2431 done_fd = eventfd(0, EFD_NONBLOCK);
2432 if (done_fd < 0) {
2433 pr_err("Failed to create wakeup eventfd, error: %m\n");
2434 status = -1;
2435 goto out_delete_session;
2436 }
2437 err = evlist__add_wakeup_eventfd(rec->evlist, done_fd);
2438 if (err < 0) {
2439 pr_err("Failed to add wakeup eventfd to poll list\n");
2440 status = err;
2441 goto out_delete_session;
2442 }
2443#endif // HAVE_EVENTFD_SUPPORT
2444
2445 session->header.env.comp_type = PERF_COMP_ZSTD;
2446 session->header.env.comp_level = rec->opts.comp_level;
2447
2448 if (rec->opts.kcore &&
2449 !record__kcore_readable(&session->machines.host)) {
2450 pr_err("ERROR: kcore is not readable.\n");
2451 return -1;
2452 }
2453
2454 if (record__init_clock(rec))
2455 return -1;
2456
2457 record__init_features(rec);
2458
2459 if (forks) {
2460 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
2461 workload_exec_failed_signal);
2462 if (err < 0) {
2463 pr_err("Couldn't run the workload!\n");
2464 status = err;
2465 goto out_delete_session;
2466 }
2467 }
2468
2469 /*
2470 * If we have just single event and are sending data
2471 * through pipe, we need to force the ids allocation,
2472 * because we synthesize event name through the pipe
2473 * and need the id for that.
2474 */
2475 if (data->is_pipe && rec->evlist->core.nr_entries == 1)
2476 rec->opts.sample_id = true;
2477
2478 if (rec->timestamp_filename && perf_data__is_pipe(data)) {
2479 rec->timestamp_filename = false;
2480 pr_warning("WARNING: --timestamp-filename option is not available in pipe mode.\n");
2481 }
2482
2483 evlist__uniquify_name(rec->evlist);
2484
2485 evlist__config(rec->evlist, opts, &callchain_param);
2486
2487 /* Debug message used by test scripts */
2488 pr_debug3("perf record opening and mmapping events\n");
2489 if (record__open(rec) != 0) {
2490 err = -1;
2491 goto out_free_threads;
2492 }
2493 /* Debug message used by test scripts */
2494 pr_debug3("perf record done opening and mmapping events\n");
2495 session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
2496
2497 if (rec->opts.kcore) {
2498 err = record__kcore_copy(&session->machines.host, data);
2499 if (err) {
2500 pr_err("ERROR: Failed to copy kcore\n");
2501 goto out_free_threads;
2502 }
2503 }
2504
2505 /*
2506 * Normally perf_session__new would do this, but it doesn't have the
2507 * evlist.
2508 */
2509 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
2510 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
2511 rec->tool.ordered_events = false;
2512 }
2513
2514 if (evlist__nr_groups(rec->evlist) == 0)
2515 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
2516
2517 if (data->is_pipe) {
2518 err = perf_header__write_pipe(fd);
2519 if (err < 0)
2520 goto out_free_threads;
2521 } else {
2522 err = perf_session__write_header(session, rec->evlist, fd, false);
2523 if (err < 0)
2524 goto out_free_threads;
2525 }
2526
2527 err = -1;
2528 if (!rec->no_buildid
2529 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
2530 pr_err("Couldn't generate buildids. "
2531 "Use --no-buildid to profile anyway.\n");
2532 goto out_free_threads;
2533 }
2534
2535 err = record__setup_sb_evlist(rec);
2536 if (err)
2537 goto out_free_threads;
2538
2539 err = record__synthesize(rec, false);
2540 if (err < 0)
2541 goto out_free_threads;
2542
2543 if (rec->realtime_prio) {
2544 struct sched_param param;
2545
2546 param.sched_priority = rec->realtime_prio;
2547 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
2548 pr_err("Could not set realtime priority.\n");
2549 err = -1;
2550 goto out_free_threads;
2551 }
2552 }
2553
2554 if (record__start_threads(rec))
2555 goto out_free_threads;
2556
2557 /*
2558 * When perf is starting the traced process, all the events
2559 * (apart from group members) have enable_on_exec=1 set,
2560 * so don't spoil it by prematurely enabling them.
2561 */
2562 if (!target__none(&opts->target) && !opts->target.initial_delay)
2563 evlist__enable(rec->evlist);
2564
2565 /*
2566 * Let the child rip
2567 */
2568 if (forks) {
2569 struct machine *machine = &session->machines.host;
2570 union perf_event *event;
2571 pid_t tgid;
2572
2573 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
2574 if (event == NULL) {
2575 err = -ENOMEM;
2576 goto out_child;
2577 }
2578
2579 /*
2580 * Some H/W events are generated before COMM event
2581 * which is emitted during exec(), so perf script
2582 * cannot see a correct process name for those events.
2583 * Synthesize COMM event to prevent it.
2584 */
2585 tgid = perf_event__synthesize_comm(tool, event,
2586 rec->evlist->workload.pid,
2587 process_synthesized_event,
2588 machine);
2589 free(event);
2590
2591 if (tgid == -1)
2592 goto out_child;
2593
2594 event = malloc(sizeof(event->namespaces) +
2595 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
2596 machine->id_hdr_size);
2597 if (event == NULL) {
2598 err = -ENOMEM;
2599 goto out_child;
2600 }
2601
2602 /*
2603 * Synthesize NAMESPACES event for the command specified.
2604 */
2605 perf_event__synthesize_namespaces(tool, event,
2606 rec->evlist->workload.pid,
2607 tgid, process_synthesized_event,
2608 machine);
2609 free(event);
2610
2611 evlist__start_workload(rec->evlist);
2612 }
2613
2614 if (opts->target.initial_delay) {
2615 pr_info(EVLIST_DISABLED_MSG);
2616 if (opts->target.initial_delay > 0) {
2617 usleep(opts->target.initial_delay * USEC_PER_MSEC);
2618 evlist__enable(rec->evlist);
2619 pr_info(EVLIST_ENABLED_MSG);
2620 }
2621 }
2622
2623 err = event_enable_timer__start(rec->evlist->eet);
2624 if (err)
2625 goto out_child;
2626
2627 /* Debug message used by test scripts */
2628 pr_debug3("perf record has started\n");
2629 fflush(stderr);
2630
2631 trigger_ready(&auxtrace_snapshot_trigger);
2632 trigger_ready(&switch_output_trigger);
2633 perf_hooks__invoke_record_start();
2634
2635 /*
2636 * Must write FINISHED_INIT so it will be seen after all other
2637 * synthesized user events, but before any regular events.
2638 */
2639 err = write_finished_init(rec, false);
2640 if (err < 0)
2641 goto out_child;
2642
2643 for (;;) {
2644 unsigned long long hits = thread->samples;
2645
2646 /*
2647 * rec->evlist->bkw_mmap_state is possible to be
2648 * BKW_MMAP_EMPTY here: when done == true and
2649 * hits != rec->samples in previous round.
2650 *
2651 * evlist__toggle_bkw_mmap ensure we never
2652 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
2653 */
2654 if (trigger_is_hit(&switch_output_trigger) || done || draining)
2655 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
2656
2657 if (record__mmap_read_all(rec, false) < 0) {
2658 trigger_error(&auxtrace_snapshot_trigger);
2659 trigger_error(&switch_output_trigger);
2660 err = -1;
2661 goto out_child;
2662 }
2663
2664 if (auxtrace_record__snapshot_started) {
2665 auxtrace_record__snapshot_started = 0;
2666 if (!trigger_is_error(&auxtrace_snapshot_trigger))
2667 record__read_auxtrace_snapshot(rec, false);
2668 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
2669 pr_err("AUX area tracing snapshot failed\n");
2670 err = -1;
2671 goto out_child;
2672 }
2673 }
2674
2675 if (trigger_is_hit(&switch_output_trigger)) {
2676 /*
2677 * If switch_output_trigger is hit, the data in
2678 * overwritable ring buffer should have been collected,
2679 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
2680 *
2681 * If SIGUSR2 raise after or during record__mmap_read_all(),
2682 * record__mmap_read_all() didn't collect data from
2683 * overwritable ring buffer. Read again.
2684 */
2685 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
2686 continue;
2687 trigger_ready(&switch_output_trigger);
2688
2689 /*
2690 * Reenable events in overwrite ring buffer after
2691 * record__mmap_read_all(): we should have collected
2692 * data from it.
2693 */
2694 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
2695
2696 if (!quiet)
2697 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
2698 record__waking(rec));
2699 thread->waking = 0;
2700 fd = record__switch_output(rec, false);
2701 if (fd < 0) {
2702 pr_err("Failed to switch to new file\n");
2703 trigger_error(&switch_output_trigger);
2704 err = fd;
2705 goto out_child;
2706 }
2707
2708 /* re-arm the alarm */
2709 if (rec->switch_output.time)
2710 alarm(rec->switch_output.time);
2711 }
2712
2713 if (hits == thread->samples) {
2714 if (done || draining)
2715 break;
2716 err = fdarray__poll(&thread->pollfd, -1);
2717 /*
2718 * Propagate error, only if there's any. Ignore positive
2719 * number of returned events and interrupt error.
2720 */
2721 if (err > 0 || (err < 0 && errno == EINTR))
2722 err = 0;
2723 thread->waking++;
2724
2725 if (fdarray__filter(&thread->pollfd, POLLERR | POLLHUP,
2726 record__thread_munmap_filtered, NULL) == 0)
2727 draining = true;
2728
2729 err = record__update_evlist_pollfd_from_thread(rec, rec->evlist, thread);
2730 if (err)
2731 goto out_child;
2732 }
2733
2734 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
2735 switch (cmd) {
2736 case EVLIST_CTL_CMD_SNAPSHOT:
2737 hit_auxtrace_snapshot_trigger(rec);
2738 evlist__ctlfd_ack(rec->evlist);
2739 break;
2740 case EVLIST_CTL_CMD_STOP:
2741 done = 1;
2742 break;
2743 case EVLIST_CTL_CMD_ACK:
2744 case EVLIST_CTL_CMD_UNSUPPORTED:
2745 case EVLIST_CTL_CMD_ENABLE:
2746 case EVLIST_CTL_CMD_DISABLE:
2747 case EVLIST_CTL_CMD_EVLIST:
2748 case EVLIST_CTL_CMD_PING:
2749 default:
2750 break;
2751 }
2752 }
2753
2754 err = event_enable_timer__process(rec->evlist->eet);
2755 if (err < 0)
2756 goto out_child;
2757 if (err) {
2758 err = 0;
2759 done = 1;
2760 }
2761
2762 /*
2763 * When perf is starting the traced process, at the end events
2764 * die with the process and we wait for that. Thus no need to
2765 * disable events in this case.
2766 */
2767 if (done && !disabled && !target__none(&opts->target)) {
2768 trigger_off(&auxtrace_snapshot_trigger);
2769 evlist__disable(rec->evlist);
2770 disabled = true;
2771 }
2772 }
2773
2774 trigger_off(&auxtrace_snapshot_trigger);
2775 trigger_off(&switch_output_trigger);
2776
2777 if (opts->auxtrace_snapshot_on_exit)
2778 record__auxtrace_snapshot_exit(rec);
2779
2780 if (forks && workload_exec_errno) {
2781 char msg[STRERR_BUFSIZE], strevsels[2048];
2782 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
2783
2784 evlist__scnprintf_evsels(rec->evlist, sizeof(strevsels), strevsels);
2785
2786 pr_err("Failed to collect '%s' for the '%s' workload: %s\n",
2787 strevsels, argv[0], emsg);
2788 err = -1;
2789 goto out_child;
2790 }
2791
2792 if (!quiet)
2793 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n",
2794 record__waking(rec));
2795
2796 write_finished_init(rec, true);
2797
2798 if (target__none(&rec->opts.target))
2799 record__synthesize_workload(rec, true);
2800
2801out_child:
2802 record__stop_threads(rec);
2803 record__mmap_read_all(rec, true);
2804out_free_threads:
2805 record__free_thread_data(rec);
2806 evlist__finalize_ctlfd(rec->evlist);
2807 record__aio_mmap_read_sync(rec);
2808
2809 if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
2810 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
2811 session->header.env.comp_ratio = ratio + 0.5;
2812 }
2813
2814 if (forks) {
2815 int exit_status;
2816
2817 if (!child_finished)
2818 kill(rec->evlist->workload.pid, SIGTERM);
2819
2820 wait(&exit_status);
2821
2822 if (err < 0)
2823 status = err;
2824 else if (WIFEXITED(exit_status))
2825 status = WEXITSTATUS(exit_status);
2826 else if (WIFSIGNALED(exit_status))
2827 signr = WTERMSIG(exit_status);
2828 } else
2829 status = err;
2830
2831 if (rec->off_cpu)
2832 rec->bytes_written += off_cpu_write(rec->session);
2833
2834 record__read_lost_samples(rec);
2835 record__synthesize(rec, true);
2836 /* this will be recalculated during process_buildids() */
2837 rec->samples = 0;
2838
2839 if (!err) {
2840 if (!rec->timestamp_filename) {
2841 record__finish_output(rec);
2842 } else {
2843 fd = record__switch_output(rec, true);
2844 if (fd < 0) {
2845 status = fd;
2846 goto out_delete_session;
2847 }
2848 }
2849 }
2850
2851 perf_hooks__invoke_record_end();
2852
2853 if (!err && !quiet) {
2854 char samples[128];
2855 const char *postfix = rec->timestamp_filename ?
2856 ".<timestamp>" : "";
2857
2858 if (rec->samples && !rec->opts.full_auxtrace)
2859 scnprintf(samples, sizeof(samples),
2860 " (%" PRIu64 " samples)", rec->samples);
2861 else
2862 samples[0] = '\0';
2863
2864 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2865 perf_data__size(data) / 1024.0 / 1024.0,
2866 data->path, postfix, samples);
2867 if (ratio) {
2868 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2869 rec->session->bytes_transferred / 1024.0 / 1024.0,
2870 ratio);
2871 }
2872 fprintf(stderr, " ]\n");
2873 }
2874
2875out_delete_session:
2876#ifdef HAVE_EVENTFD_SUPPORT
2877 if (done_fd >= 0) {
2878 fd = done_fd;
2879 done_fd = -1;
2880
2881 close(fd);
2882 }
2883#endif
2884 zstd_fini(&session->zstd_data);
2885 if (!opts->no_bpf_event)
2886 evlist__stop_sb_thread(rec->sb_evlist);
2887
2888 perf_session__delete(session);
2889 return status;
2890}
2891
2892static void callchain_debug(struct callchain_param *callchain)
2893{
2894 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2895
2896 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2897
2898 if (callchain->record_mode == CALLCHAIN_DWARF)
2899 pr_debug("callchain: stack dump size %d\n",
2900 callchain->dump_size);
2901}
2902
2903int record_opts__parse_callchain(struct record_opts *record,
2904 struct callchain_param *callchain,
2905 const char *arg, bool unset)
2906{
2907 int ret;
2908 callchain->enabled = !unset;
2909
2910 /* --no-call-graph */
2911 if (unset) {
2912 callchain->record_mode = CALLCHAIN_NONE;
2913 pr_debug("callchain: disabled\n");
2914 return 0;
2915 }
2916
2917 ret = parse_callchain_record_opt(arg, callchain);
2918 if (!ret) {
2919 /* Enable data address sampling for DWARF unwind. */
2920 if (callchain->record_mode == CALLCHAIN_DWARF)
2921 record->sample_address = true;
2922 callchain_debug(callchain);
2923 }
2924
2925 return ret;
2926}
2927
2928int record_parse_callchain_opt(const struct option *opt,
2929 const char *arg,
2930 int unset)
2931{
2932 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2933}
2934
2935int record_callchain_opt(const struct option *opt,
2936 const char *arg __maybe_unused,
2937 int unset __maybe_unused)
2938{
2939 struct callchain_param *callchain = opt->value;
2940
2941 callchain->enabled = true;
2942
2943 if (callchain->record_mode == CALLCHAIN_NONE)
2944 callchain->record_mode = CALLCHAIN_FP;
2945
2946 callchain_debug(callchain);
2947 return 0;
2948}
2949
2950static int perf_record_config(const char *var, const char *value, void *cb)
2951{
2952 struct record *rec = cb;
2953
2954 if (!strcmp(var, "record.build-id")) {
2955 if (!strcmp(value, "cache"))
2956 rec->no_buildid_cache = false;
2957 else if (!strcmp(value, "no-cache"))
2958 rec->no_buildid_cache = true;
2959 else if (!strcmp(value, "skip"))
2960 rec->no_buildid = true;
2961 else if (!strcmp(value, "mmap"))
2962 rec->buildid_mmap = true;
2963 else
2964 return -1;
2965 return 0;
2966 }
2967 if (!strcmp(var, "record.call-graph")) {
2968 var = "call-graph.record-mode";
2969 return perf_default_config(var, value, cb);
2970 }
2971#ifdef HAVE_AIO_SUPPORT
2972 if (!strcmp(var, "record.aio")) {
2973 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2974 if (!rec->opts.nr_cblocks)
2975 rec->opts.nr_cblocks = nr_cblocks_default;
2976 }
2977#endif
2978 if (!strcmp(var, "record.debuginfod")) {
2979 rec->debuginfod.urls = strdup(value);
2980 if (!rec->debuginfod.urls)
2981 return -ENOMEM;
2982 rec->debuginfod.set = true;
2983 }
2984
2985 return 0;
2986}
2987
2988static int record__parse_event_enable_time(const struct option *opt, const char *str, int unset)
2989{
2990 struct record *rec = (struct record *)opt->value;
2991
2992 return evlist__parse_event_enable_time(rec->evlist, &rec->opts, str, unset);
2993}
2994
2995static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2996{
2997 struct record_opts *opts = (struct record_opts *)opt->value;
2998
2999 if (unset || !str)
3000 return 0;
3001
3002 if (!strcasecmp(str, "node"))
3003 opts->affinity = PERF_AFFINITY_NODE;
3004 else if (!strcasecmp(str, "cpu"))
3005 opts->affinity = PERF_AFFINITY_CPU;
3006
3007 return 0;
3008}
3009
3010static int record__mmap_cpu_mask_alloc(struct mmap_cpu_mask *mask, int nr_bits)
3011{
3012 mask->nbits = nr_bits;
3013 mask->bits = bitmap_zalloc(mask->nbits);
3014 if (!mask->bits)
3015 return -ENOMEM;
3016
3017 return 0;
3018}
3019
3020static void record__mmap_cpu_mask_free(struct mmap_cpu_mask *mask)
3021{
3022 bitmap_free(mask->bits);
3023 mask->nbits = 0;
3024}
3025
3026static int record__thread_mask_alloc(struct thread_mask *mask, int nr_bits)
3027{
3028 int ret;
3029
3030 ret = record__mmap_cpu_mask_alloc(&mask->maps, nr_bits);
3031 if (ret) {
3032 mask->affinity.bits = NULL;
3033 return ret;
3034 }
3035
3036 ret = record__mmap_cpu_mask_alloc(&mask->affinity, nr_bits);
3037 if (ret) {
3038 record__mmap_cpu_mask_free(&mask->maps);
3039 mask->maps.bits = NULL;
3040 }
3041
3042 return ret;
3043}
3044
3045static void record__thread_mask_free(struct thread_mask *mask)
3046{
3047 record__mmap_cpu_mask_free(&mask->maps);
3048 record__mmap_cpu_mask_free(&mask->affinity);
3049}
3050
3051static int record__parse_threads(const struct option *opt, const char *str, int unset)
3052{
3053 int s;
3054 struct record_opts *opts = opt->value;
3055
3056 if (unset || !str || !strlen(str)) {
3057 opts->threads_spec = THREAD_SPEC__CPU;
3058 } else {
3059 for (s = 1; s < THREAD_SPEC__MAX; s++) {
3060 if (s == THREAD_SPEC__USER) {
3061 opts->threads_user_spec = strdup(str);
3062 if (!opts->threads_user_spec)
3063 return -ENOMEM;
3064 opts->threads_spec = THREAD_SPEC__USER;
3065 break;
3066 }
3067 if (!strncasecmp(str, thread_spec_tags[s], strlen(thread_spec_tags[s]))) {
3068 opts->threads_spec = s;
3069 break;
3070 }
3071 }
3072 }
3073
3074 if (opts->threads_spec == THREAD_SPEC__USER)
3075 pr_debug("threads_spec: %s\n", opts->threads_user_spec);
3076 else
3077 pr_debug("threads_spec: %s\n", thread_spec_tags[opts->threads_spec]);
3078
3079 return 0;
3080}
3081
3082static int parse_output_max_size(const struct option *opt,
3083 const char *str, int unset)
3084{
3085 unsigned long *s = (unsigned long *)opt->value;
3086 static struct parse_tag tags_size[] = {
3087 { .tag = 'B', .mult = 1 },
3088 { .tag = 'K', .mult = 1 << 10 },
3089 { .tag = 'M', .mult = 1 << 20 },
3090 { .tag = 'G', .mult = 1 << 30 },
3091 { .tag = 0 },
3092 };
3093 unsigned long val;
3094
3095 if (unset) {
3096 *s = 0;
3097 return 0;
3098 }
3099
3100 val = parse_tag_value(str, tags_size);
3101 if (val != (unsigned long) -1) {
3102 *s = val;
3103 return 0;
3104 }
3105
3106 return -1;
3107}
3108
3109static int record__parse_mmap_pages(const struct option *opt,
3110 const char *str,
3111 int unset __maybe_unused)
3112{
3113 struct record_opts *opts = opt->value;
3114 char *s, *p;
3115 unsigned int mmap_pages;
3116 int ret;
3117
3118 if (!str)
3119 return -EINVAL;
3120
3121 s = strdup(str);
3122 if (!s)
3123 return -ENOMEM;
3124
3125 p = strchr(s, ',');
3126 if (p)
3127 *p = '\0';
3128
3129 if (*s) {
3130 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
3131 if (ret)
3132 goto out_free;
3133 opts->mmap_pages = mmap_pages;
3134 }
3135
3136 if (!p) {
3137 ret = 0;
3138 goto out_free;
3139 }
3140
3141 ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
3142 if (ret)
3143 goto out_free;
3144
3145 opts->auxtrace_mmap_pages = mmap_pages;
3146
3147out_free:
3148 free(s);
3149 return ret;
3150}
3151
3152void __weak arch__add_leaf_frame_record_opts(struct record_opts *opts __maybe_unused)
3153{
3154}
3155
3156static int parse_control_option(const struct option *opt,
3157 const char *str,
3158 int unset __maybe_unused)
3159{
3160 struct record_opts *opts = opt->value;
3161
3162 return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
3163}
3164
3165static void switch_output_size_warn(struct record *rec)
3166{
3167 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
3168 struct switch_output *s = &rec->switch_output;
3169
3170 wakeup_size /= 2;
3171
3172 if (s->size < wakeup_size) {
3173 char buf[100];
3174
3175 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
3176 pr_warning("WARNING: switch-output data size lower than "
3177 "wakeup kernel buffer size (%s) "
3178 "expect bigger perf.data sizes\n", buf);
3179 }
3180}
3181
3182static int switch_output_setup(struct record *rec)
3183{
3184 struct switch_output *s = &rec->switch_output;
3185 static struct parse_tag tags_size[] = {
3186 { .tag = 'B', .mult = 1 },
3187 { .tag = 'K', .mult = 1 << 10 },
3188 { .tag = 'M', .mult = 1 << 20 },
3189 { .tag = 'G', .mult = 1 << 30 },
3190 { .tag = 0 },
3191 };
3192 static struct parse_tag tags_time[] = {
3193 { .tag = 's', .mult = 1 },
3194 { .tag = 'm', .mult = 60 },
3195 { .tag = 'h', .mult = 60*60 },
3196 { .tag = 'd', .mult = 60*60*24 },
3197 { .tag = 0 },
3198 };
3199 unsigned long val;
3200
3201 /*
3202 * If we're using --switch-output-events, then we imply its
3203 * --switch-output=signal, as we'll send a SIGUSR2 from the side band
3204 * thread to its parent.
3205 */
3206 if (rec->switch_output_event_set) {
3207 if (record__threads_enabled(rec)) {
3208 pr_warning("WARNING: --switch-output-event option is not available in parallel streaming mode.\n");
3209 return 0;
3210 }
3211 goto do_signal;
3212 }
3213
3214 if (!s->set)
3215 return 0;
3216
3217 if (record__threads_enabled(rec)) {
3218 pr_warning("WARNING: --switch-output option is not available in parallel streaming mode.\n");
3219 return 0;
3220 }
3221
3222 if (!strcmp(s->str, "signal")) {
3223do_signal:
3224 s->signal = true;
3225 pr_debug("switch-output with SIGUSR2 signal\n");
3226 goto enabled;
3227 }
3228
3229 val = parse_tag_value(s->str, tags_size);
3230 if (val != (unsigned long) -1) {
3231 s->size = val;
3232 pr_debug("switch-output with %s size threshold\n", s->str);
3233 goto enabled;
3234 }
3235
3236 val = parse_tag_value(s->str, tags_time);
3237 if (val != (unsigned long) -1) {
3238 s->time = val;
3239 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
3240 s->str, s->time);
3241 goto enabled;
3242 }
3243
3244 return -1;
3245
3246enabled:
3247 rec->timestamp_filename = true;
3248 s->enabled = true;
3249
3250 if (s->size && !rec->opts.no_buffering)
3251 switch_output_size_warn(rec);
3252
3253 return 0;
3254}
3255
3256static const char * const __record_usage[] = {
3257 "perf record [<options>] [<command>]",
3258 "perf record [<options>] -- <command> [<options>]",
3259 NULL
3260};
3261const char * const *record_usage = __record_usage;
3262
3263static int build_id__process_mmap(const struct perf_tool *tool, union perf_event *event,
3264 struct perf_sample *sample, struct machine *machine)
3265{
3266 /*
3267 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
3268 * no need to add them twice.
3269 */
3270 if (!(event->header.misc & PERF_RECORD_MISC_USER))
3271 return 0;
3272 return perf_event__process_mmap(tool, event, sample, machine);
3273}
3274
3275static int build_id__process_mmap2(const struct perf_tool *tool, union perf_event *event,
3276 struct perf_sample *sample, struct machine *machine)
3277{
3278 /*
3279 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
3280 * no need to add them twice.
3281 */
3282 if (!(event->header.misc & PERF_RECORD_MISC_USER))
3283 return 0;
3284
3285 return perf_event__process_mmap2(tool, event, sample, machine);
3286}
3287
3288static int process_timestamp_boundary(const struct perf_tool *tool,
3289 union perf_event *event __maybe_unused,
3290 struct perf_sample *sample,
3291 struct machine *machine __maybe_unused)
3292{
3293 struct record *rec = container_of(tool, struct record, tool);
3294
3295 set_timestamp_boundary(rec, sample->time);
3296 return 0;
3297}
3298
3299static int parse_record_synth_option(const struct option *opt,
3300 const char *str,
3301 int unset __maybe_unused)
3302{
3303 struct record_opts *opts = opt->value;
3304 char *p = strdup(str);
3305
3306 if (p == NULL)
3307 return -1;
3308
3309 opts->synth = parse_synth_opt(p);
3310 free(p);
3311
3312 if (opts->synth < 0) {
3313 pr_err("Invalid synth option: %s\n", str);
3314 return -1;
3315 }
3316 return 0;
3317}
3318
3319/*
3320 * XXX Ideally would be local to cmd_record() and passed to a record__new
3321 * because we need to have access to it in record__exit, that is called
3322 * after cmd_record() exits, but since record_options need to be accessible to
3323 * builtin-script, leave it here.
3324 *
3325 * At least we don't ouch it in all the other functions here directly.
3326 *
3327 * Just say no to tons of global variables, sigh.
3328 */
3329static struct record record = {
3330 .opts = {
3331 .sample_time = true,
3332 .mmap_pages = UINT_MAX,
3333 .user_freq = UINT_MAX,
3334 .user_interval = ULLONG_MAX,
3335 .freq = 4000,
3336 .target = {
3337 .uses_mmap = true,
3338 .default_per_cpu = true,
3339 },
3340 .mmap_flush = MMAP_FLUSH_DEFAULT,
3341 .nr_threads_synthesize = 1,
3342 .ctl_fd = -1,
3343 .ctl_fd_ack = -1,
3344 .synth = PERF_SYNTH_ALL,
3345 },
3346};
3347
3348const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
3349 "\n\t\t\t\tDefault: fp";
3350
3351static bool dry_run;
3352
3353static struct parse_events_option_args parse_events_option_args = {
3354 .evlistp = &record.evlist,
3355};
3356
3357static struct parse_events_option_args switch_output_parse_events_option_args = {
3358 .evlistp = &record.sb_evlist,
3359};
3360
3361/*
3362 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
3363 * with it and switch to use the library functions in perf_evlist that came
3364 * from builtin-record.c, i.e. use record_opts,
3365 * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
3366 * using pipes, etc.
3367 */
3368static struct option __record_options[] = {
3369 OPT_CALLBACK('e', "event", &parse_events_option_args, "event",
3370 "event selector. use 'perf list' to list available events",
3371 parse_events_option),
3372 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
3373 "event filter", parse_filter),
3374 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
3375 NULL, "don't record events from perf itself",
3376 exclude_perf),
3377 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
3378 "record events on existing process id"),
3379 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
3380 "record events on existing thread id"),
3381 OPT_INTEGER('r', "realtime", &record.realtime_prio,
3382 "collect data with this RT SCHED_FIFO priority"),
3383 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
3384 "collect data without buffering"),
3385 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
3386 "collect raw sample records from all opened counters"),
3387 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
3388 "system-wide collection from all CPUs"),
3389 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
3390 "list of cpus to monitor"),
3391 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
3392 OPT_STRING('o', "output", &record.data.path, "file",
3393 "output file name"),
3394 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
3395 &record.opts.no_inherit_set,
3396 "child tasks do not inherit counters"),
3397 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
3398 "synthesize non-sample events at the end of output"),
3399 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
3400 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
3401 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
3402 "Fail if the specified frequency can't be used"),
3403 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
3404 "profile at this frequency",
3405 record__parse_freq),
3406 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
3407 "number of mmap data pages and AUX area tracing mmap pages",
3408 record__parse_mmap_pages),
3409 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
3410 "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
3411 record__mmap_flush_parse),
3412 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
3413 NULL, "enables call-graph recording" ,
3414 &record_callchain_opt),
3415 OPT_CALLBACK(0, "call-graph", &record.opts,
3416 "record_mode[,record_size]", record_callchain_help,
3417 &record_parse_callchain_opt),
3418 OPT_INCR('v', "verbose", &verbose,
3419 "be more verbose (show counter open errors, etc)"),
3420 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any warnings or messages"),
3421 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
3422 "per thread counts"),
3423 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
3424 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
3425 "Record the sample physical addresses"),
3426 OPT_BOOLEAN(0, "data-page-size", &record.opts.sample_data_page_size,
3427 "Record the sampled data address data page size"),
3428 OPT_BOOLEAN(0, "code-page-size", &record.opts.sample_code_page_size,
3429 "Record the sampled code address (ip) page size"),
3430 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
3431 OPT_BOOLEAN(0, "sample-identifier", &record.opts.sample_identifier,
3432 "Record the sample identifier"),
3433 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
3434 &record.opts.sample_time_set,
3435 "Record the sample timestamps"),
3436 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
3437 "Record the sample period"),
3438 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
3439 "don't sample"),
3440 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
3441 &record.no_buildid_cache_set,
3442 "do not update the buildid cache"),
3443 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
3444 &record.no_buildid_set,
3445 "do not collect buildids in perf.data"),
3446 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
3447 "monitor event in cgroup name only",
3448 parse_cgroups),
3449 OPT_CALLBACK('D', "delay", &record, "ms",
3450 "ms to wait before starting measurement after program start (-1: start with events disabled), "
3451 "or ranges of time to enable events e.g. '-D 10-20,30-40'",
3452 record__parse_event_enable_time),
3453 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
3454 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
3455 "user to profile"),
3456
3457 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
3458 "branch any", "sample any taken branches",
3459 parse_branch_stack),
3460
3461 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
3462 "branch filter mask", "branch stack filter modes",
3463 parse_branch_stack),
3464 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
3465 "sample by weight (on special events only)"),
3466 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
3467 "sample transaction flags (special events only)"),
3468 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
3469 "use per-thread mmaps"),
3470 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
3471 "sample selected machine registers on interrupt,"
3472 " use '-I?' to list register names", parse_intr_regs),
3473 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
3474 "sample selected machine registers on interrupt,"
3475 " use '--user-regs=?' to list register names", parse_user_regs),
3476 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
3477 "Record running/enabled time of read (:S) events"),
3478 OPT_CALLBACK('k', "clockid", &record.opts,
3479 "clockid", "clockid to use for events, see clock_gettime()",
3480 parse_clockid),
3481 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
3482 "opts", "AUX area tracing Snapshot Mode", ""),
3483 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
3484 "opts", "sample AUX area", ""),
3485 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
3486 "per thread proc mmap processing timeout in ms"),
3487 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
3488 "Record namespaces events"),
3489 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
3490 "Record cgroup events"),
3491 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
3492 &record.opts.record_switch_events_set,
3493 "Record context switch events"),
3494 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
3495 "Configure all used events to run in kernel space.",
3496 PARSE_OPT_EXCLUSIVE),
3497 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
3498 "Configure all used events to run in user space.",
3499 PARSE_OPT_EXCLUSIVE),
3500 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
3501 "collect kernel callchains"),
3502 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
3503 "collect user callchains"),
3504 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
3505 "file", "vmlinux pathname"),
3506 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
3507 "Record build-id of all DSOs regardless of hits"),
3508 OPT_BOOLEAN(0, "buildid-mmap", &record.buildid_mmap,
3509 "Record build-id in map events"),
3510 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
3511 "append timestamp to output filename"),
3512 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
3513 "Record timestamp boundary (time of first/last samples)"),
3514 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
3515 &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
3516 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
3517 "signal"),
3518 OPT_CALLBACK_SET(0, "switch-output-event", &switch_output_parse_events_option_args,
3519 &record.switch_output_event_set, "switch output event",
3520 "switch output event selector. use 'perf list' to list available events",
3521 parse_events_option_new_evlist),
3522 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
3523 "Limit number of switch output generated files"),
3524 OPT_BOOLEAN(0, "dry-run", &dry_run,
3525 "Parse options then exit"),
3526#ifdef HAVE_AIO_SUPPORT
3527 OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
3528 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
3529 record__aio_parse),
3530#endif
3531 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
3532 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
3533 record__parse_affinity),
3534#ifdef HAVE_ZSTD_SUPPORT
3535 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default, "n",
3536 "Compress records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
3537 record__parse_comp_level),
3538#endif
3539 OPT_CALLBACK(0, "max-size", &record.output_max_size,
3540 "size", "Limit the maximum size of the output file", parse_output_max_size),
3541 OPT_UINTEGER(0, "num-thread-synthesize",
3542 &record.opts.nr_threads_synthesize,
3543 "number of threads to run for event synthesis"),
3544#ifdef HAVE_LIBPFM
3545 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
3546 "libpfm4 event selector. use 'perf list' to list available events",
3547 parse_libpfm_events_option),
3548#endif
3549 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
3550 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
3551 "\t\t\t 'snapshot': AUX area tracing snapshot).\n"
3552 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
3553 "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
3554 parse_control_option),
3555 OPT_CALLBACK(0, "synth", &record.opts, "no|all|task|mmap|cgroup",
3556 "Fine-tune event synthesis: default=all", parse_record_synth_option),
3557 OPT_STRING_OPTARG_SET(0, "debuginfod", &record.debuginfod.urls,
3558 &record.debuginfod.set, "debuginfod urls",
3559 "Enable debuginfod data retrieval from DEBUGINFOD_URLS or specified urls",
3560 "system"),
3561 OPT_CALLBACK_OPTARG(0, "threads", &record.opts, NULL, "spec",
3562 "write collected trace data into several data files using parallel threads",
3563 record__parse_threads),
3564 OPT_BOOLEAN(0, "off-cpu", &record.off_cpu, "Enable off-cpu analysis"),
3565 OPT_STRING(0, "setup-filter", &record.filter_action, "pin|unpin",
3566 "BPF filter action"),
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 if (rec->filter_action) {
4097 if (!strcmp(rec->filter_action, "pin"))
4098 err = perf_bpf_filter__pin();
4099 else if (!strcmp(rec->filter_action, "unpin"))
4100 err = perf_bpf_filter__unpin();
4101 else {
4102 pr_warning("Unknown BPF filter action: %s\n", rec->filter_action);
4103 err = -EINVAL;
4104 }
4105 goto out_opts;
4106 }
4107
4108 /*
4109 * Allow aliases to facilitate the lookup of symbols for address
4110 * filters. Refer to auxtrace_parse_filters().
4111 */
4112 symbol_conf.allow_aliases = true;
4113
4114 symbol__init(NULL);
4115
4116 err = record__auxtrace_init(rec);
4117 if (err)
4118 goto out;
4119
4120 if (dry_run)
4121 goto out;
4122
4123 err = -ENOMEM;
4124
4125 if (rec->no_buildid_cache || rec->no_buildid) {
4126 disable_buildid_cache();
4127 } else if (rec->switch_output.enabled) {
4128 /*
4129 * In 'perf record --switch-output', disable buildid
4130 * generation by default to reduce data file switching
4131 * overhead. Still generate buildid if they are required
4132 * explicitly using
4133 *
4134 * perf record --switch-output --no-no-buildid \
4135 * --no-no-buildid-cache
4136 *
4137 * Following code equals to:
4138 *
4139 * if ((rec->no_buildid || !rec->no_buildid_set) &&
4140 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
4141 * disable_buildid_cache();
4142 */
4143 bool disable = true;
4144
4145 if (rec->no_buildid_set && !rec->no_buildid)
4146 disable = false;
4147 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
4148 disable = false;
4149 if (disable) {
4150 rec->no_buildid = true;
4151 rec->no_buildid_cache = true;
4152 disable_buildid_cache();
4153 }
4154 }
4155
4156 if (record.opts.overwrite)
4157 record.opts.tail_synthesize = true;
4158
4159 if (rec->evlist->core.nr_entries == 0) {
4160 err = parse_event(rec->evlist, "cycles:P");
4161 if (err)
4162 goto out;
4163 }
4164
4165 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
4166 rec->opts.no_inherit = true;
4167
4168 err = target__validate(&rec->opts.target);
4169 if (err) {
4170 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
4171 ui__warning("%s\n", errbuf);
4172 }
4173
4174 err = target__parse_uid(&rec->opts.target);
4175 if (err) {
4176 int saved_errno = errno;
4177
4178 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
4179 ui__error("%s", errbuf);
4180
4181 err = -saved_errno;
4182 goto out;
4183 }
4184
4185 /* Enable ignoring missing threads when -u/-p option is defined. */
4186 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
4187
4188 evlist__warn_user_requested_cpus(rec->evlist, rec->opts.target.cpu_list);
4189
4190 if (callchain_param.enabled && callchain_param.record_mode == CALLCHAIN_FP)
4191 arch__add_leaf_frame_record_opts(&rec->opts);
4192
4193 err = -ENOMEM;
4194 if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0) {
4195 if (rec->opts.target.pid != NULL) {
4196 pr_err("Couldn't create thread/CPU maps: %s\n",
4197 errno == ENOENT ? "No such process" : str_error_r(errno, errbuf, sizeof(errbuf)));
4198 goto out;
4199 }
4200 else
4201 usage_with_options(record_usage, record_options);
4202 }
4203
4204 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
4205 if (err)
4206 goto out;
4207
4208 /*
4209 * We take all buildids when the file contains
4210 * AUX area tracing data because we do not decode the
4211 * trace because it would take too long.
4212 */
4213 if (rec->opts.full_auxtrace)
4214 rec->buildid_all = true;
4215
4216 if (rec->opts.text_poke) {
4217 err = record__config_text_poke(rec->evlist);
4218 if (err) {
4219 pr_err("record__config_text_poke failed, error %d\n", err);
4220 goto out;
4221 }
4222 }
4223
4224 if (rec->off_cpu) {
4225 err = record__config_off_cpu(rec);
4226 if (err) {
4227 pr_err("record__config_off_cpu failed, error %d\n", err);
4228 goto out;
4229 }
4230 }
4231
4232 if (record_opts__config(&rec->opts)) {
4233 err = -EINVAL;
4234 goto out;
4235 }
4236
4237 err = record__config_tracking_events(rec);
4238 if (err) {
4239 pr_err("record__config_tracking_events failed, error %d\n", err);
4240 goto out;
4241 }
4242
4243 err = record__init_thread_masks(rec);
4244 if (err) {
4245 pr_err("Failed to initialize parallel data streaming masks\n");
4246 goto out;
4247 }
4248
4249 if (rec->opts.nr_cblocks > nr_cblocks_max)
4250 rec->opts.nr_cblocks = nr_cblocks_max;
4251 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
4252
4253 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
4254 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
4255
4256 if (rec->opts.comp_level > comp_level_max)
4257 rec->opts.comp_level = comp_level_max;
4258 pr_debug("comp level: %d\n", rec->opts.comp_level);
4259
4260 err = __cmd_record(&record, argc, argv);
4261out:
4262 record__free_thread_masks(rec, rec->nr_threads);
4263 rec->nr_threads = 0;
4264 symbol__exit();
4265 auxtrace_record__free(rec->itr);
4266out_opts:
4267 evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
4268 evlist__delete(rec->evlist);
4269 return err;
4270}
4271
4272static void snapshot_sig_handler(int sig __maybe_unused)
4273{
4274 struct record *rec = &record;
4275
4276 hit_auxtrace_snapshot_trigger(rec);
4277
4278 if (switch_output_signal(rec))
4279 trigger_hit(&switch_output_trigger);
4280}
4281
4282static void alarm_sig_handler(int sig __maybe_unused)
4283{
4284 struct record *rec = &record;
4285
4286 if (switch_output_time(rec))
4287 trigger_hit(&switch_output_trigger);
4288}