1 // SPDX-License-Identifier: GPL-2.0
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.
11 #include "util/build-id.h"
12 #include <subcmd/parse-options.h>
13 #include "util/parse-events.h"
14 #include "util/config.h"
16 #include "util/callchain.h"
17 #include "util/cgroup.h"
18 #include "util/header.h"
19 #include "util/event.h"
20 #include "util/evlist.h"
21 #include "util/evsel.h"
22 #include "util/debug.h"
23 #include "util/mmap.h"
24 #include "util/target.h"
25 #include "util/session.h"
26 #include "util/tool.h"
27 #include "util/symbol.h"
28 #include "util/record.h"
29 #include "util/cpumap.h"
30 #include "util/thread_map.h"
31 #include "util/data.h"
32 #include "util/perf_regs.h"
33 #include "util/auxtrace.h"
35 #include "util/parse-branch-options.h"
36 #include "util/parse-regs-options.h"
37 #include "util/perf_api_probe.h"
38 #include "util/llvm-utils.h"
39 #include "util/bpf-loader.h"
40 #include "util/trigger.h"
41 #include "util/perf-hooks.h"
42 #include "util/cpu-set-sched.h"
43 #include "util/synthetic-events.h"
44 #include "util/time-utils.h"
45 #include "util/units.h"
46 #include "util/bpf-event.h"
47 #include "util/util.h"
49 #include "util/clockid.h"
61 #ifdef HAVE_EVENTFD_SUPPORT
62 #include <sys/eventfd.h>
66 #include <sys/types.h>
69 #include <linux/err.h>
70 #include <linux/string.h>
71 #include <linux/time64.h>
72 #include <linux/zalloc.h>
73 #include <linux/bitmap.h>
76 struct switch_output {
89 struct perf_tool tool;
90 struct record_opts opts;
92 struct perf_data data;
93 struct auxtrace_record *itr;
94 struct evlist *evlist;
95 struct perf_session *session;
96 struct evlist *sb_evlist;
99 bool switch_output_event_set;
102 bool no_buildid_cache;
103 bool no_buildid_cache_set;
105 bool timestamp_filename;
106 bool timestamp_boundary;
107 struct switch_output switch_output;
108 unsigned long long samples;
109 struct mmap_cpu_mask affinity_mask;
110 unsigned long output_max_size; /* = 0: unlimited */
113 static volatile int done;
115 static volatile int auxtrace_record__snapshot_started;
116 static DEFINE_TRIGGER(auxtrace_snapshot_trigger);
117 static DEFINE_TRIGGER(switch_output_trigger);
119 static const char *affinity_tags[PERF_AFFINITY_MAX] = {
123 static bool switch_output_signal(struct record *rec)
125 return rec->switch_output.signal &&
126 trigger_is_ready(&switch_output_trigger);
129 static bool switch_output_size(struct record *rec)
131 return rec->switch_output.size &&
132 trigger_is_ready(&switch_output_trigger) &&
133 (rec->bytes_written >= rec->switch_output.size);
136 static bool switch_output_time(struct record *rec)
138 return rec->switch_output.time &&
139 trigger_is_ready(&switch_output_trigger);
142 static bool record__output_max_size_exceeded(struct record *rec)
144 return rec->output_max_size &&
145 (rec->bytes_written >= rec->output_max_size);
148 static int record__write(struct record *rec, struct mmap *map __maybe_unused,
149 void *bf, size_t size)
151 struct perf_data_file *file = &rec->session->data->file;
153 if (perf_data_file__write(file, bf, size) < 0) {
154 pr_err("failed to write perf data, error: %m\n");
158 rec->bytes_written += size;
160 if (record__output_max_size_exceeded(rec) && !done) {
161 fprintf(stderr, "[ perf record: perf size limit reached (%" PRIu64 " KB),"
162 " stopping session ]\n",
163 rec->bytes_written >> 10);
167 if (switch_output_size(rec))
168 trigger_hit(&switch_output_trigger);
173 static int record__aio_enabled(struct record *rec);
174 static int record__comp_enabled(struct record *rec);
175 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
176 void *src, size_t src_size);
178 #ifdef HAVE_AIO_SUPPORT
179 static int record__aio_write(struct aiocb *cblock, int trace_fd,
180 void *buf, size_t size, off_t off)
184 cblock->aio_fildes = trace_fd;
185 cblock->aio_buf = buf;
186 cblock->aio_nbytes = size;
187 cblock->aio_offset = off;
188 cblock->aio_sigevent.sigev_notify = SIGEV_NONE;
191 rc = aio_write(cblock);
194 } else if (errno != EAGAIN) {
195 cblock->aio_fildes = -1;
196 pr_err("failed to queue perf data, error: %m\n");
204 static int record__aio_complete(struct mmap *md, struct aiocb *cblock)
210 ssize_t aio_ret, written;
212 aio_errno = aio_error(cblock);
213 if (aio_errno == EINPROGRESS)
216 written = aio_ret = aio_return(cblock);
218 if (aio_errno != EINTR)
219 pr_err("failed to write perf data, error: %m\n");
223 rem_size = cblock->aio_nbytes - written;
226 cblock->aio_fildes = -1;
228 * md->refcount is incremented in record__aio_pushfn() for
229 * every aio write request started in record__aio_push() so
230 * decrement it because the request is now complete.
232 perf_mmap__put(&md->core);
236 * aio write request may require restart with the
237 * reminder if the kernel didn't write whole
240 rem_off = cblock->aio_offset + written;
241 rem_buf = (void *)(cblock->aio_buf + written);
242 record__aio_write(cblock, cblock->aio_fildes,
243 rem_buf, rem_size, rem_off);
250 static int record__aio_sync(struct mmap *md, bool sync_all)
252 struct aiocb **aiocb = md->aio.aiocb;
253 struct aiocb *cblocks = md->aio.cblocks;
254 struct timespec timeout = { 0, 1000 * 1000 * 1 }; /* 1ms */
259 for (i = 0; i < md->aio.nr_cblocks; ++i) {
260 if (cblocks[i].aio_fildes == -1 || record__aio_complete(md, &cblocks[i])) {
267 * Started aio write is not complete yet
268 * so it has to be waited before the
271 aiocb[i] = &cblocks[i];
278 while (aio_suspend((const struct aiocb **)aiocb, md->aio.nr_cblocks, &timeout)) {
279 if (!(errno == EAGAIN || errno == EINTR))
280 pr_err("failed to sync perf data, error: %m\n");
291 static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size)
293 struct record_aio *aio = to;
296 * map->core.base data pointed by buf is copied into free map->aio.data[] buffer
297 * to release space in the kernel buffer as fast as possible, calling
298 * perf_mmap__consume() from perf_mmap__push() function.
300 * That lets the kernel to proceed with storing more profiling data into
301 * the kernel buffer earlier than other per-cpu kernel buffers are handled.
303 * Coping can be done in two steps in case the chunk of profiling data
304 * crosses the upper bound of the kernel buffer. In this case we first move
305 * part of data from map->start till the upper bound and then the reminder
306 * from the beginning of the kernel buffer till the end of the data chunk.
309 if (record__comp_enabled(aio->rec)) {
310 size = zstd_compress(aio->rec->session, aio->data + aio->size,
311 mmap__mmap_len(map) - aio->size,
314 memcpy(aio->data + aio->size, buf, size);
319 * Increment map->refcount to guard map->aio.data[] buffer
320 * from premature deallocation because map object can be
321 * released earlier than aio write request started on
322 * map->aio.data[] buffer is complete.
324 * perf_mmap__put() is done at record__aio_complete()
325 * after started aio request completion or at record__aio_push()
326 * if the request failed to start.
328 perf_mmap__get(&map->core);
336 static int record__aio_push(struct record *rec, struct mmap *map, off_t *off)
339 int trace_fd = rec->session->data->file.fd;
340 struct record_aio aio = { .rec = rec, .size = 0 };
343 * Call record__aio_sync() to wait till map->aio.data[] buffer
344 * becomes available after previous aio write operation.
347 idx = record__aio_sync(map, false);
348 aio.data = map->aio.data[idx];
349 ret = perf_mmap__push(map, &aio, record__aio_pushfn);
350 if (ret != 0) /* ret > 0 - no data, ret < 0 - error */
354 ret = record__aio_write(&(map->aio.cblocks[idx]), trace_fd, aio.data, aio.size, *off);
357 rec->bytes_written += aio.size;
358 if (switch_output_size(rec))
359 trigger_hit(&switch_output_trigger);
362 * Decrement map->refcount incremented in record__aio_pushfn()
363 * back if record__aio_write() operation failed to start, otherwise
364 * map->refcount is decremented in record__aio_complete() after
365 * aio write operation finishes successfully.
367 perf_mmap__put(&map->core);
373 static off_t record__aio_get_pos(int trace_fd)
375 return lseek(trace_fd, 0, SEEK_CUR);
378 static void record__aio_set_pos(int trace_fd, off_t pos)
380 lseek(trace_fd, pos, SEEK_SET);
383 static void record__aio_mmap_read_sync(struct record *rec)
386 struct evlist *evlist = rec->evlist;
387 struct mmap *maps = evlist->mmap;
389 if (!record__aio_enabled(rec))
392 for (i = 0; i < evlist->core.nr_mmaps; i++) {
393 struct mmap *map = &maps[i];
396 record__aio_sync(map, true);
400 static int nr_cblocks_default = 1;
401 static int nr_cblocks_max = 4;
403 static int record__aio_parse(const struct option *opt,
407 struct record_opts *opts = (struct record_opts *)opt->value;
410 opts->nr_cblocks = 0;
413 opts->nr_cblocks = strtol(str, NULL, 0);
414 if (!opts->nr_cblocks)
415 opts->nr_cblocks = nr_cblocks_default;
420 #else /* HAVE_AIO_SUPPORT */
421 static int nr_cblocks_max = 0;
423 static int record__aio_push(struct record *rec __maybe_unused, struct mmap *map __maybe_unused,
424 off_t *off __maybe_unused)
429 static off_t record__aio_get_pos(int trace_fd __maybe_unused)
434 static void record__aio_set_pos(int trace_fd __maybe_unused, off_t pos __maybe_unused)
438 static void record__aio_mmap_read_sync(struct record *rec __maybe_unused)
443 static int record__aio_enabled(struct record *rec)
445 return rec->opts.nr_cblocks > 0;
448 #define MMAP_FLUSH_DEFAULT 1
449 static int record__mmap_flush_parse(const struct option *opt,
454 struct record_opts *opts = (struct record_opts *)opt->value;
455 static struct parse_tag tags[] = {
456 { .tag = 'B', .mult = 1 },
457 { .tag = 'K', .mult = 1 << 10 },
458 { .tag = 'M', .mult = 1 << 20 },
459 { .tag = 'G', .mult = 1 << 30 },
467 opts->mmap_flush = parse_tag_value(str, tags);
468 if (opts->mmap_flush == (int)-1)
469 opts->mmap_flush = strtol(str, NULL, 0);
472 if (!opts->mmap_flush)
473 opts->mmap_flush = MMAP_FLUSH_DEFAULT;
475 flush_max = evlist__mmap_size(opts->mmap_pages);
477 if (opts->mmap_flush > flush_max)
478 opts->mmap_flush = flush_max;
483 #ifdef HAVE_ZSTD_SUPPORT
484 static unsigned int comp_level_default = 1;
486 static int record__parse_comp_level(const struct option *opt, const char *str, int unset)
488 struct record_opts *opts = opt->value;
491 opts->comp_level = 0;
494 opts->comp_level = strtol(str, NULL, 0);
495 if (!opts->comp_level)
496 opts->comp_level = comp_level_default;
502 static unsigned int comp_level_max = 22;
504 static int record__comp_enabled(struct record *rec)
506 return rec->opts.comp_level > 0;
509 static int process_synthesized_event(struct perf_tool *tool,
510 union perf_event *event,
511 struct perf_sample *sample __maybe_unused,
512 struct machine *machine __maybe_unused)
514 struct record *rec = container_of(tool, struct record, tool);
515 return record__write(rec, NULL, event, event->header.size);
518 static int process_locked_synthesized_event(struct perf_tool *tool,
519 union perf_event *event,
520 struct perf_sample *sample __maybe_unused,
521 struct machine *machine __maybe_unused)
523 static pthread_mutex_t synth_lock = PTHREAD_MUTEX_INITIALIZER;
526 pthread_mutex_lock(&synth_lock);
527 ret = process_synthesized_event(tool, event, sample, machine);
528 pthread_mutex_unlock(&synth_lock);
532 static int record__pushfn(struct mmap *map, void *to, void *bf, size_t size)
534 struct record *rec = to;
536 if (record__comp_enabled(rec)) {
537 size = zstd_compress(rec->session, map->data, mmap__mmap_len(map), bf, size);
542 return record__write(rec, map, bf, size);
545 static volatile int signr = -1;
546 static volatile int child_finished;
547 #ifdef HAVE_EVENTFD_SUPPORT
548 static int done_fd = -1;
551 static void sig_handler(int sig)
559 #ifdef HAVE_EVENTFD_SUPPORT
563 * It is possible for this signal handler to run after done is checked
564 * in the main loop, but before the perf counter fds are polled. If this
565 * happens, the poll() will continue to wait even though done is set,
566 * and will only break out if either another signal is received, or the
567 * counters are ready for read. To ensure the poll() doesn't sleep when
568 * done is set, use an eventfd (done_fd) to wake up the poll().
570 if (write(done_fd, &tmp, sizeof(tmp)) < 0)
571 pr_err("failed to signal wakeup fd, error: %m\n");
573 #endif // HAVE_EVENTFD_SUPPORT
576 static void sigsegv_handler(int sig)
578 perf_hooks__recover();
579 sighandler_dump_stack(sig);
582 static void record__sig_exit(void)
587 signal(signr, SIG_DFL);
591 #ifdef HAVE_AUXTRACE_SUPPORT
593 static int record__process_auxtrace(struct perf_tool *tool,
595 union perf_event *event, void *data1,
596 size_t len1, void *data2, size_t len2)
598 struct record *rec = container_of(tool, struct record, tool);
599 struct perf_data *data = &rec->data;
603 if (!perf_data__is_pipe(data) && perf_data__is_single_file(data)) {
605 int fd = perf_data__fd(data);
608 file_offset = lseek(fd, 0, SEEK_CUR);
609 if (file_offset == -1)
611 err = auxtrace_index__auxtrace_event(&rec->session->auxtrace_index,
617 /* event.auxtrace.size includes padding, see __auxtrace_mmap__read() */
618 padding = (len1 + len2) & 7;
620 padding = 8 - padding;
622 record__write(rec, map, event, event->header.size);
623 record__write(rec, map, data1, len1);
625 record__write(rec, map, data2, len2);
626 record__write(rec, map, &pad, padding);
631 static int record__auxtrace_mmap_read(struct record *rec,
636 ret = auxtrace_mmap__read(map, rec->itr, &rec->tool,
637 record__process_auxtrace);
647 static int record__auxtrace_mmap_read_snapshot(struct record *rec,
652 ret = auxtrace_mmap__read_snapshot(map, rec->itr, &rec->tool,
653 record__process_auxtrace,
654 rec->opts.auxtrace_snapshot_size);
664 static int record__auxtrace_read_snapshot_all(struct record *rec)
669 for (i = 0; i < rec->evlist->core.nr_mmaps; i++) {
670 struct mmap *map = &rec->evlist->mmap[i];
672 if (!map->auxtrace_mmap.base)
675 if (record__auxtrace_mmap_read_snapshot(rec, map) != 0) {
684 static void record__read_auxtrace_snapshot(struct record *rec, bool on_exit)
686 pr_debug("Recording AUX area tracing snapshot\n");
687 if (record__auxtrace_read_snapshot_all(rec) < 0) {
688 trigger_error(&auxtrace_snapshot_trigger);
690 if (auxtrace_record__snapshot_finish(rec->itr, on_exit))
691 trigger_error(&auxtrace_snapshot_trigger);
693 trigger_ready(&auxtrace_snapshot_trigger);
697 static int record__auxtrace_snapshot_exit(struct record *rec)
699 if (trigger_is_error(&auxtrace_snapshot_trigger))
702 if (!auxtrace_record__snapshot_started &&
703 auxtrace_record__snapshot_start(rec->itr))
706 record__read_auxtrace_snapshot(rec, true);
707 if (trigger_is_error(&auxtrace_snapshot_trigger))
713 static int record__auxtrace_init(struct record *rec)
718 rec->itr = auxtrace_record__init(rec->evlist, &err);
723 err = auxtrace_parse_snapshot_options(rec->itr, &rec->opts,
724 rec->opts.auxtrace_snapshot_opts);
728 err = auxtrace_parse_sample_options(rec->itr, rec->evlist, &rec->opts,
729 rec->opts.auxtrace_sample_opts);
733 return auxtrace_parse_filters(rec->evlist);
739 int record__auxtrace_mmap_read(struct record *rec __maybe_unused,
740 struct mmap *map __maybe_unused)
746 void record__read_auxtrace_snapshot(struct record *rec __maybe_unused,
747 bool on_exit __maybe_unused)
752 int auxtrace_record__snapshot_start(struct auxtrace_record *itr __maybe_unused)
758 int record__auxtrace_snapshot_exit(struct record *rec __maybe_unused)
763 static int record__auxtrace_init(struct record *rec __maybe_unused)
770 static int record__config_text_poke(struct evlist *evlist)
775 /* Nothing to do if text poke is already configured */
776 evlist__for_each_entry(evlist, evsel) {
777 if (evsel->core.attr.text_poke)
781 err = parse_events(evlist, "dummy:u", NULL);
785 evsel = evlist__last(evlist);
787 evsel->core.attr.freq = 0;
788 evsel->core.attr.sample_period = 1;
789 evsel->core.attr.text_poke = 1;
790 evsel->core.attr.ksymbol = 1;
792 evsel->core.system_wide = true;
793 evsel->no_aux_samples = true;
794 evsel->immediate = true;
796 /* Text poke must be collected on all CPUs */
797 perf_cpu_map__put(evsel->core.own_cpus);
798 evsel->core.own_cpus = perf_cpu_map__new(NULL);
799 perf_cpu_map__put(evsel->core.cpus);
800 evsel->core.cpus = perf_cpu_map__get(evsel->core.own_cpus);
802 evsel__set_sample_bit(evsel, TIME);
807 static bool record__kcore_readable(struct machine *machine)
809 char kcore[PATH_MAX];
812 scnprintf(kcore, sizeof(kcore), "%s/proc/kcore", machine->root_dir);
814 fd = open(kcore, O_RDONLY);
823 static int record__kcore_copy(struct machine *machine, struct perf_data *data)
825 char from_dir[PATH_MAX];
826 char kcore_dir[PATH_MAX];
829 snprintf(from_dir, sizeof(from_dir), "%s/proc", machine->root_dir);
831 ret = perf_data__make_kcore_dir(data, kcore_dir, sizeof(kcore_dir));
835 return kcore_copy(from_dir, kcore_dir);
838 static int record__mmap_evlist(struct record *rec,
839 struct evlist *evlist)
841 struct record_opts *opts = &rec->opts;
842 bool auxtrace_overwrite = opts->auxtrace_snapshot_mode ||
843 opts->auxtrace_sample_mode;
846 if (opts->affinity != PERF_AFFINITY_SYS)
847 cpu__setup_cpunode_map();
849 if (evlist__mmap_ex(evlist, opts->mmap_pages,
850 opts->auxtrace_mmap_pages,
852 opts->nr_cblocks, opts->affinity,
853 opts->mmap_flush, opts->comp_level) < 0) {
854 if (errno == EPERM) {
855 pr_err("Permission error mapping pages.\n"
856 "Consider increasing "
857 "/proc/sys/kernel/perf_event_mlock_kb,\n"
858 "or try again with a smaller value of -m/--mmap_pages.\n"
859 "(current value: %u,%u)\n",
860 opts->mmap_pages, opts->auxtrace_mmap_pages);
863 pr_err("failed to mmap with %d (%s)\n", errno,
864 str_error_r(errno, msg, sizeof(msg)));
874 static int record__mmap(struct record *rec)
876 return record__mmap_evlist(rec, rec->evlist);
879 static int record__open(struct record *rec)
883 struct evlist *evlist = rec->evlist;
884 struct perf_session *session = rec->session;
885 struct record_opts *opts = &rec->opts;
889 * For initial_delay or system wide, we need to add a dummy event so
890 * that we can track PERF_RECORD_MMAP to cover the delay of waiting or
893 if (opts->initial_delay || target__has_cpu(&opts->target)) {
894 pos = evlist__get_tracking_event(evlist);
895 if (!evsel__is_dummy_event(pos)) {
896 /* Set up dummy event. */
897 if (evlist__add_dummy(evlist))
899 pos = evlist__last(evlist);
900 evlist__set_tracking_event(evlist, pos);
904 * Enable the dummy event when the process is forked for
905 * initial_delay, immediately for system wide.
907 if (opts->initial_delay && !pos->immediate)
908 pos->core.attr.enable_on_exec = 1;
913 evlist__config(evlist, opts, &callchain_param);
915 evlist__for_each_entry(evlist, pos) {
917 if (evsel__open(pos, pos->core.cpus, pos->core.threads) < 0) {
918 if (evsel__fallback(pos, errno, msg, sizeof(msg))) {
920 ui__warning("%s\n", msg);
923 if ((errno == EINVAL || errno == EBADF) &&
924 pos->leader != pos &&
926 pos = evlist__reset_weak_group(evlist, pos, true);
930 evsel__open_strerror(pos, &opts->target, errno, msg, sizeof(msg));
931 ui__error("%s\n", msg);
935 pos->supported = true;
938 if (symbol_conf.kptr_restrict && !evlist__exclude_kernel(evlist)) {
940 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
941 "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
942 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
943 "file is not found in the buildid cache or in the vmlinux path.\n\n"
944 "Samples in kernel modules won't be resolved at all.\n\n"
945 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
946 "even with a suitable vmlinux or kallsyms file.\n\n");
949 if (evlist__apply_filters(evlist, &pos)) {
950 pr_err("failed to set filter \"%s\" on event %s with %d (%s)\n",
951 pos->filter, evsel__name(pos), errno,
952 str_error_r(errno, msg, sizeof(msg)));
957 rc = record__mmap(rec);
961 session->evlist = evlist;
962 perf_session__set_id_hdr_size(session);
967 static int process_sample_event(struct perf_tool *tool,
968 union perf_event *event,
969 struct perf_sample *sample,
971 struct machine *machine)
973 struct record *rec = container_of(tool, struct record, tool);
975 if (rec->evlist->first_sample_time == 0)
976 rec->evlist->first_sample_time = sample->time;
978 rec->evlist->last_sample_time = sample->time;
980 if (rec->buildid_all)
984 return build_id__mark_dso_hit(tool, event, sample, evsel, machine);
987 static int process_buildids(struct record *rec)
989 struct perf_session *session = rec->session;
991 if (perf_data__size(&rec->data) == 0)
995 * During this process, it'll load kernel map and replace the
996 * dso->long_name to a real pathname it found. In this case
997 * we prefer the vmlinux path like
998 * /lib/modules/3.16.4/build/vmlinux
1000 * rather than build-id path (in debug directory).
1001 * $HOME/.debug/.build-id/f0/6e17aa50adf4d00b88925e03775de107611551
1003 symbol_conf.ignore_vmlinux_buildid = true;
1006 * If --buildid-all is given, it marks all DSO regardless of hits,
1007 * so no need to process samples. But if timestamp_boundary is enabled,
1008 * it still needs to walk on all samples to get the timestamps of
1009 * first/last samples.
1011 if (rec->buildid_all && !rec->timestamp_boundary)
1012 rec->tool.sample = NULL;
1014 return perf_session__process_events(session);
1017 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
1020 struct perf_tool *tool = data;
1022 *As for guest kernel when processing subcommand record&report,
1023 *we arrange module mmap prior to guest kernel mmap and trigger
1024 *a preload dso because default guest module symbols are loaded
1025 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
1026 *method is used to avoid symbol missing when the first addr is
1027 *in module instead of in guest kernel.
1029 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1032 pr_err("Couldn't record guest kernel [%d]'s reference"
1033 " relocation symbol.\n", machine->pid);
1036 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
1037 * have no _text sometimes.
1039 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1042 pr_err("Couldn't record guest kernel [%d]'s reference"
1043 " relocation symbol.\n", machine->pid);
1046 static struct perf_event_header finished_round_event = {
1047 .size = sizeof(struct perf_event_header),
1048 .type = PERF_RECORD_FINISHED_ROUND,
1051 static void record__adjust_affinity(struct record *rec, struct mmap *map)
1053 if (rec->opts.affinity != PERF_AFFINITY_SYS &&
1054 !bitmap_equal(rec->affinity_mask.bits, map->affinity_mask.bits,
1055 rec->affinity_mask.nbits)) {
1056 bitmap_zero(rec->affinity_mask.bits, rec->affinity_mask.nbits);
1057 bitmap_or(rec->affinity_mask.bits, rec->affinity_mask.bits,
1058 map->affinity_mask.bits, rec->affinity_mask.nbits);
1059 sched_setaffinity(0, MMAP_CPU_MASK_BYTES(&rec->affinity_mask),
1060 (cpu_set_t *)rec->affinity_mask.bits);
1062 mmap_cpu_mask__scnprintf(&rec->affinity_mask, "thread");
1066 static size_t process_comp_header(void *record, size_t increment)
1068 struct perf_record_compressed *event = record;
1069 size_t size = sizeof(*event);
1072 event->header.size += increment;
1076 event->header.type = PERF_RECORD_COMPRESSED;
1077 event->header.size = size;
1082 static size_t zstd_compress(struct perf_session *session, void *dst, size_t dst_size,
1083 void *src, size_t src_size)
1086 size_t max_record_size = PERF_SAMPLE_MAX_SIZE - sizeof(struct perf_record_compressed) - 1;
1088 compressed = zstd_compress_stream_to_records(&session->zstd_data, dst, dst_size, src, src_size,
1089 max_record_size, process_comp_header);
1091 session->bytes_transferred += src_size;
1092 session->bytes_compressed += compressed;
1097 static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist,
1098 bool overwrite, bool synch)
1100 u64 bytes_written = rec->bytes_written;
1104 int trace_fd = rec->data.file.fd;
1110 maps = overwrite ? evlist->overwrite_mmap : evlist->mmap;
1114 if (overwrite && evlist->bkw_mmap_state != BKW_MMAP_DATA_PENDING)
1117 if (record__aio_enabled(rec))
1118 off = record__aio_get_pos(trace_fd);
1120 for (i = 0; i < evlist->core.nr_mmaps; i++) {
1122 struct mmap *map = &maps[i];
1124 if (map->core.base) {
1125 record__adjust_affinity(rec, map);
1127 flush = map->core.flush;
1128 map->core.flush = 1;
1130 if (!record__aio_enabled(rec)) {
1131 if (perf_mmap__push(map, rec, record__pushfn) < 0) {
1133 map->core.flush = flush;
1138 if (record__aio_push(rec, map, &off) < 0) {
1139 record__aio_set_pos(trace_fd, off);
1141 map->core.flush = flush;
1147 map->core.flush = flush;
1150 if (map->auxtrace_mmap.base && !rec->opts.auxtrace_snapshot_mode &&
1151 !rec->opts.auxtrace_sample_mode &&
1152 record__auxtrace_mmap_read(rec, map) != 0) {
1158 if (record__aio_enabled(rec))
1159 record__aio_set_pos(trace_fd, off);
1162 * Mark the round finished in case we wrote
1163 * at least one event.
1165 if (bytes_written != rec->bytes_written)
1166 rc = record__write(rec, NULL, &finished_round_event, sizeof(finished_round_event));
1169 evlist__toggle_bkw_mmap(evlist, BKW_MMAP_EMPTY);
1174 static int record__mmap_read_all(struct record *rec, bool synch)
1178 err = record__mmap_read_evlist(rec, rec->evlist, false, synch);
1182 return record__mmap_read_evlist(rec, rec->evlist, true, synch);
1185 static void record__init_features(struct record *rec)
1187 struct perf_session *session = rec->session;
1190 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
1191 perf_header__set_feat(&session->header, feat);
1193 if (rec->no_buildid)
1194 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
1196 if (!have_tracepoints(&rec->evlist->core.entries))
1197 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
1199 if (!rec->opts.branch_stack)
1200 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
1202 if (!rec->opts.full_auxtrace)
1203 perf_header__clear_feat(&session->header, HEADER_AUXTRACE);
1205 if (!(rec->opts.use_clockid && rec->opts.clockid_res_ns))
1206 perf_header__clear_feat(&session->header, HEADER_CLOCKID);
1208 if (!rec->opts.use_clockid)
1209 perf_header__clear_feat(&session->header, HEADER_CLOCK_DATA);
1211 perf_header__clear_feat(&session->header, HEADER_DIR_FORMAT);
1212 if (!record__comp_enabled(rec))
1213 perf_header__clear_feat(&session->header, HEADER_COMPRESSED);
1215 perf_header__clear_feat(&session->header, HEADER_STAT);
1219 record__finish_output(struct record *rec)
1221 struct perf_data *data = &rec->data;
1222 int fd = perf_data__fd(data);
1227 rec->session->header.data_size += rec->bytes_written;
1228 data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR);
1230 if (!rec->no_buildid) {
1231 process_buildids(rec);
1233 if (rec->buildid_all)
1234 dsos__hit_all(rec->session);
1236 perf_session__write_header(rec->session, rec->evlist, fd, true);
1241 static int record__synthesize_workload(struct record *rec, bool tail)
1244 struct perf_thread_map *thread_map;
1246 if (rec->opts.tail_synthesize != tail)
1249 thread_map = thread_map__new_by_tid(rec->evlist->workload.pid);
1250 if (thread_map == NULL)
1253 err = perf_event__synthesize_thread_map(&rec->tool, thread_map,
1254 process_synthesized_event,
1255 &rec->session->machines.host,
1256 rec->opts.sample_address);
1257 perf_thread_map__put(thread_map);
1261 static int record__synthesize(struct record *rec, bool tail);
1264 record__switch_output(struct record *rec, bool at_exit)
1266 struct perf_data *data = &rec->data;
1270 /* Same Size: "2015122520103046"*/
1271 char timestamp[] = "InvalidTimestamp";
1273 record__aio_mmap_read_sync(rec);
1275 record__synthesize(rec, true);
1276 if (target__none(&rec->opts.target))
1277 record__synthesize_workload(rec, true);
1280 record__finish_output(rec);
1281 err = fetch_current_timestamp(timestamp, sizeof(timestamp));
1283 pr_err("Failed to get current timestamp\n");
1287 fd = perf_data__switch(data, timestamp,
1288 rec->session->header.data_offset,
1289 at_exit, &new_filename);
1290 if (fd >= 0 && !at_exit) {
1291 rec->bytes_written = 0;
1292 rec->session->header.data_size = 0;
1296 fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
1297 data->path, timestamp);
1299 if (rec->switch_output.num_files) {
1300 int n = rec->switch_output.cur_file + 1;
1302 if (n >= rec->switch_output.num_files)
1304 rec->switch_output.cur_file = n;
1305 if (rec->switch_output.filenames[n]) {
1306 remove(rec->switch_output.filenames[n]);
1307 zfree(&rec->switch_output.filenames[n]);
1309 rec->switch_output.filenames[n] = new_filename;
1314 /* Output tracking events */
1316 record__synthesize(rec, false);
1319 * In 'perf record --switch-output' without -a,
1320 * record__synthesize() in record__switch_output() won't
1321 * generate tracking events because there's no thread_map
1322 * in evlist. Which causes newly created perf.data doesn't
1323 * contain map and comm information.
1324 * Create a fake thread_map and directly call
1325 * perf_event__synthesize_thread_map() for those events.
1327 if (target__none(&rec->opts.target))
1328 record__synthesize_workload(rec, false);
1333 static volatile int workload_exec_errno;
1336 * evlist__prepare_workload will send a SIGUSR1
1337 * if the fork fails, since we asked by setting its
1338 * want_signal to true.
1340 static void workload_exec_failed_signal(int signo __maybe_unused,
1342 void *ucontext __maybe_unused)
1344 workload_exec_errno = info->si_value.sival_int;
1349 static void snapshot_sig_handler(int sig);
1350 static void alarm_sig_handler(int sig);
1352 static const struct perf_event_mmap_page *
1353 perf_evlist__pick_pc(struct evlist *evlist)
1356 if (evlist->mmap && evlist->mmap[0].core.base)
1357 return evlist->mmap[0].core.base;
1358 if (evlist->overwrite_mmap && evlist->overwrite_mmap[0].core.base)
1359 return evlist->overwrite_mmap[0].core.base;
1364 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
1366 const struct perf_event_mmap_page *pc;
1368 pc = perf_evlist__pick_pc(rec->evlist);
1374 static int record__synthesize(struct record *rec, bool tail)
1376 struct perf_session *session = rec->session;
1377 struct machine *machine = &session->machines.host;
1378 struct perf_data *data = &rec->data;
1379 struct record_opts *opts = &rec->opts;
1380 struct perf_tool *tool = &rec->tool;
1381 int fd = perf_data__fd(data);
1383 event_op f = process_synthesized_event;
1385 if (rec->opts.tail_synthesize != tail)
1388 if (data->is_pipe) {
1390 * We need to synthesize events first, because some
1391 * features works on top of them (on report side).
1393 err = perf_event__synthesize_attrs(tool, rec->evlist,
1394 process_synthesized_event);
1396 pr_err("Couldn't synthesize attrs.\n");
1400 err = perf_event__synthesize_features(tool, session, rec->evlist,
1401 process_synthesized_event);
1403 pr_err("Couldn't synthesize features.\n");
1407 if (have_tracepoints(&rec->evlist->core.entries)) {
1409 * FIXME err <= 0 here actually means that
1410 * there were no tracepoints so its not really
1411 * an error, just that we don't need to
1412 * synthesize anything. We really have to
1413 * return this more properly and also
1414 * propagate errors that now are calling die()
1416 err = perf_event__synthesize_tracing_data(tool, fd, rec->evlist,
1417 process_synthesized_event);
1419 pr_err("Couldn't record tracing data.\n");
1422 rec->bytes_written += err;
1426 err = perf_event__synth_time_conv(record__pick_pc(rec), tool,
1427 process_synthesized_event, machine);
1431 /* Synthesize id_index before auxtrace_info */
1432 if (rec->opts.auxtrace_sample_mode) {
1433 err = perf_event__synthesize_id_index(tool,
1434 process_synthesized_event,
1435 session->evlist, machine);
1440 if (rec->opts.full_auxtrace) {
1441 err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
1442 session, process_synthesized_event);
1447 if (!evlist__exclude_kernel(rec->evlist)) {
1448 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
1450 WARN_ONCE(err < 0, "Couldn't record kernel reference relocation symbol\n"
1451 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1452 "Check /proc/kallsyms permission or run as root.\n");
1454 err = perf_event__synthesize_modules(tool, process_synthesized_event,
1456 WARN_ONCE(err < 0, "Couldn't record kernel module information.\n"
1457 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
1458 "Check /proc/modules permission or run as root.\n");
1462 machines__process_guests(&session->machines,
1463 perf_event__synthesize_guest_os, tool);
1466 err = perf_event__synthesize_extra_attr(&rec->tool,
1468 process_synthesized_event,
1473 err = perf_event__synthesize_thread_map2(&rec->tool, rec->evlist->core.threads,
1474 process_synthesized_event,
1477 pr_err("Couldn't synthesize thread map.\n");
1481 err = perf_event__synthesize_cpu_map(&rec->tool, rec->evlist->core.cpus,
1482 process_synthesized_event, NULL);
1484 pr_err("Couldn't synthesize cpu map.\n");
1488 err = perf_event__synthesize_bpf_events(session, process_synthesized_event,
1491 pr_warning("Couldn't synthesize bpf events.\n");
1493 err = perf_event__synthesize_cgroups(tool, process_synthesized_event,
1496 pr_warning("Couldn't synthesize cgroup events.\n");
1498 if (rec->opts.nr_threads_synthesize > 1) {
1499 perf_set_multithreaded();
1500 f = process_locked_synthesized_event;
1503 err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->core.threads,
1504 f, opts->sample_address,
1505 rec->opts.nr_threads_synthesize);
1507 if (rec->opts.nr_threads_synthesize > 1)
1508 perf_set_singlethreaded();
1514 static int record__process_signal_event(union perf_event *event __maybe_unused, void *data)
1516 struct record *rec = data;
1517 pthread_kill(rec->thread_id, SIGUSR2);
1521 static int record__setup_sb_evlist(struct record *rec)
1523 struct record_opts *opts = &rec->opts;
1525 if (rec->sb_evlist != NULL) {
1527 * We get here if --switch-output-event populated the
1528 * sb_evlist, so associate a callback that will send a SIGUSR2
1529 * to the main thread.
1531 evlist__set_cb(rec->sb_evlist, record__process_signal_event, rec);
1532 rec->thread_id = pthread_self();
1534 #ifdef HAVE_LIBBPF_SUPPORT
1535 if (!opts->no_bpf_event) {
1536 if (rec->sb_evlist == NULL) {
1537 rec->sb_evlist = evlist__new();
1539 if (rec->sb_evlist == NULL) {
1540 pr_err("Couldn't create side band evlist.\n.");
1545 if (evlist__add_bpf_sb_event(rec->sb_evlist, &rec->session->header.env)) {
1546 pr_err("Couldn't ask for PERF_RECORD_BPF_EVENT side band events.\n.");
1551 if (evlist__start_sb_thread(rec->sb_evlist, &rec->opts.target)) {
1552 pr_debug("Couldn't start the BPF side band thread:\nBPF programs starting from now on won't be annotatable\n");
1553 opts->no_bpf_event = true;
1559 static int record__init_clock(struct record *rec)
1561 struct perf_session *session = rec->session;
1562 struct timespec ref_clockid;
1563 struct timeval ref_tod;
1566 if (!rec->opts.use_clockid)
1569 if (rec->opts.use_clockid && rec->opts.clockid_res_ns)
1570 session->header.env.clock.clockid_res_ns = rec->opts.clockid_res_ns;
1572 session->header.env.clock.clockid = rec->opts.clockid;
1574 if (gettimeofday(&ref_tod, NULL) != 0) {
1575 pr_err("gettimeofday failed, cannot set reference time.\n");
1579 if (clock_gettime(rec->opts.clockid, &ref_clockid)) {
1580 pr_err("clock_gettime failed, cannot set reference time.\n");
1584 ref = (u64) ref_tod.tv_sec * NSEC_PER_SEC +
1585 (u64) ref_tod.tv_usec * NSEC_PER_USEC;
1587 session->header.env.clock.tod_ns = ref;
1589 ref = (u64) ref_clockid.tv_sec * NSEC_PER_SEC +
1590 (u64) ref_clockid.tv_nsec;
1592 session->header.env.clock.clockid_ns = ref;
1596 static void hit_auxtrace_snapshot_trigger(struct record *rec)
1598 if (trigger_is_ready(&auxtrace_snapshot_trigger)) {
1599 trigger_hit(&auxtrace_snapshot_trigger);
1600 auxtrace_record__snapshot_started = 1;
1601 if (auxtrace_record__snapshot_start(rec->itr))
1602 trigger_error(&auxtrace_snapshot_trigger);
1606 static int __cmd_record(struct record *rec, int argc, const char **argv)
1610 unsigned long waking = 0;
1611 const bool forks = argc > 0;
1612 struct perf_tool *tool = &rec->tool;
1613 struct record_opts *opts = &rec->opts;
1614 struct perf_data *data = &rec->data;
1615 struct perf_session *session;
1616 bool disabled = false, draining = false;
1619 enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
1621 atexit(record__sig_exit);
1622 signal(SIGCHLD, sig_handler);
1623 signal(SIGINT, sig_handler);
1624 signal(SIGTERM, sig_handler);
1625 signal(SIGSEGV, sigsegv_handler);
1627 if (rec->opts.record_namespaces)
1628 tool->namespace_events = true;
1630 if (rec->opts.record_cgroup) {
1631 #ifdef HAVE_FILE_HANDLE
1632 tool->cgroup_events = true;
1634 pr_err("cgroup tracking is not supported\n");
1639 if (rec->opts.auxtrace_snapshot_mode || rec->switch_output.enabled) {
1640 signal(SIGUSR2, snapshot_sig_handler);
1641 if (rec->opts.auxtrace_snapshot_mode)
1642 trigger_on(&auxtrace_snapshot_trigger);
1643 if (rec->switch_output.enabled)
1644 trigger_on(&switch_output_trigger);
1646 signal(SIGUSR2, SIG_IGN);
1649 session = perf_session__new(data, false, tool);
1650 if (IS_ERR(session)) {
1651 pr_err("Perf session creation failed.\n");
1652 return PTR_ERR(session);
1655 fd = perf_data__fd(data);
1656 rec->session = session;
1658 if (zstd_init(&session->zstd_data, rec->opts.comp_level) < 0) {
1659 pr_err("Compression initialization failed.\n");
1662 #ifdef HAVE_EVENTFD_SUPPORT
1663 done_fd = eventfd(0, EFD_NONBLOCK);
1665 pr_err("Failed to create wakeup eventfd, error: %m\n");
1667 goto out_delete_session;
1669 err = evlist__add_pollfd(rec->evlist, done_fd);
1671 pr_err("Failed to add wakeup eventfd to poll list\n");
1673 goto out_delete_session;
1675 #endif // HAVE_EVENTFD_SUPPORT
1677 session->header.env.comp_type = PERF_COMP_ZSTD;
1678 session->header.env.comp_level = rec->opts.comp_level;
1680 if (rec->opts.kcore &&
1681 !record__kcore_readable(&session->machines.host)) {
1682 pr_err("ERROR: kcore is not readable.\n");
1686 if (record__init_clock(rec))
1689 record__init_features(rec);
1692 err = evlist__prepare_workload(rec->evlist, &opts->target, argv, data->is_pipe,
1693 workload_exec_failed_signal);
1695 pr_err("Couldn't run the workload!\n");
1697 goto out_delete_session;
1702 * If we have just single event and are sending data
1703 * through pipe, we need to force the ids allocation,
1704 * because we synthesize event name through the pipe
1705 * and need the id for that.
1707 if (data->is_pipe && rec->evlist->core.nr_entries == 1)
1708 rec->opts.sample_id = true;
1710 if (record__open(rec) != 0) {
1714 session->header.env.comp_mmap_len = session->evlist->core.mmap_len;
1716 if (rec->opts.kcore) {
1717 err = record__kcore_copy(&session->machines.host, data);
1719 pr_err("ERROR: Failed to copy kcore\n");
1724 err = bpf__apply_obj_config();
1726 char errbuf[BUFSIZ];
1728 bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
1729 pr_err("ERROR: Apply config to BPF failed: %s\n",
1735 * Normally perf_session__new would do this, but it doesn't have the
1738 if (rec->tool.ordered_events && !evlist__sample_id_all(rec->evlist)) {
1739 pr_warning("WARNING: No sample_id_all support, falling back to unordered processing\n");
1740 rec->tool.ordered_events = false;
1743 if (!rec->evlist->nr_groups)
1744 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
1746 if (data->is_pipe) {
1747 err = perf_header__write_pipe(fd);
1751 err = perf_session__write_header(session, rec->evlist, fd, false);
1757 if (!rec->no_buildid
1758 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
1759 pr_err("Couldn't generate buildids. "
1760 "Use --no-buildid to profile anyway.\n");
1764 err = record__setup_sb_evlist(rec);
1768 err = record__synthesize(rec, false);
1772 if (rec->realtime_prio) {
1773 struct sched_param param;
1775 param.sched_priority = rec->realtime_prio;
1776 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
1777 pr_err("Could not set realtime priority.\n");
1784 * When perf is starting the traced process, all the events
1785 * (apart from group members) have enable_on_exec=1 set,
1786 * so don't spoil it by prematurely enabling them.
1788 if (!target__none(&opts->target) && !opts->initial_delay)
1789 evlist__enable(rec->evlist);
1795 struct machine *machine = &session->machines.host;
1796 union perf_event *event;
1799 event = malloc(sizeof(event->comm) + machine->id_hdr_size);
1800 if (event == NULL) {
1806 * Some H/W events are generated before COMM event
1807 * which is emitted during exec(), so perf script
1808 * cannot see a correct process name for those events.
1809 * Synthesize COMM event to prevent it.
1811 tgid = perf_event__synthesize_comm(tool, event,
1812 rec->evlist->workload.pid,
1813 process_synthesized_event,
1820 event = malloc(sizeof(event->namespaces) +
1821 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
1822 machine->id_hdr_size);
1823 if (event == NULL) {
1829 * Synthesize NAMESPACES event for the command specified.
1831 perf_event__synthesize_namespaces(tool, event,
1832 rec->evlist->workload.pid,
1833 tgid, process_synthesized_event,
1837 evlist__start_workload(rec->evlist);
1840 if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
1843 if (opts->initial_delay) {
1844 pr_info(EVLIST_DISABLED_MSG);
1845 if (opts->initial_delay > 0) {
1846 usleep(opts->initial_delay * USEC_PER_MSEC);
1847 evlist__enable(rec->evlist);
1848 pr_info(EVLIST_ENABLED_MSG);
1852 trigger_ready(&auxtrace_snapshot_trigger);
1853 trigger_ready(&switch_output_trigger);
1854 perf_hooks__invoke_record_start();
1856 unsigned long long hits = rec->samples;
1859 * rec->evlist->bkw_mmap_state is possible to be
1860 * BKW_MMAP_EMPTY here: when done == true and
1861 * hits != rec->samples in previous round.
1863 * evlist__toggle_bkw_mmap ensure we never
1864 * convert BKW_MMAP_EMPTY to BKW_MMAP_DATA_PENDING.
1866 if (trigger_is_hit(&switch_output_trigger) || done || draining)
1867 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_DATA_PENDING);
1869 if (record__mmap_read_all(rec, false) < 0) {
1870 trigger_error(&auxtrace_snapshot_trigger);
1871 trigger_error(&switch_output_trigger);
1876 if (auxtrace_record__snapshot_started) {
1877 auxtrace_record__snapshot_started = 0;
1878 if (!trigger_is_error(&auxtrace_snapshot_trigger))
1879 record__read_auxtrace_snapshot(rec, false);
1880 if (trigger_is_error(&auxtrace_snapshot_trigger)) {
1881 pr_err("AUX area tracing snapshot failed\n");
1887 if (trigger_is_hit(&switch_output_trigger)) {
1889 * If switch_output_trigger is hit, the data in
1890 * overwritable ring buffer should have been collected,
1891 * so bkw_mmap_state should be set to BKW_MMAP_EMPTY.
1893 * If SIGUSR2 raise after or during record__mmap_read_all(),
1894 * record__mmap_read_all() didn't collect data from
1895 * overwritable ring buffer. Read again.
1897 if (rec->evlist->bkw_mmap_state == BKW_MMAP_RUNNING)
1899 trigger_ready(&switch_output_trigger);
1902 * Reenable events in overwrite ring buffer after
1903 * record__mmap_read_all(): we should have collected
1906 evlist__toggle_bkw_mmap(rec->evlist, BKW_MMAP_RUNNING);
1909 fprintf(stderr, "[ perf record: dump data: Woken up %ld times ]\n",
1912 fd = record__switch_output(rec, false);
1914 pr_err("Failed to switch to new file\n");
1915 trigger_error(&switch_output_trigger);
1920 /* re-arm the alarm */
1921 if (rec->switch_output.time)
1922 alarm(rec->switch_output.time);
1925 if (hits == rec->samples) {
1926 if (done || draining)
1928 err = evlist__poll(rec->evlist, -1);
1930 * Propagate error, only if there's any. Ignore positive
1931 * number of returned events and interrupt error.
1933 if (err > 0 || (err < 0 && errno == EINTR))
1937 if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
1941 if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
1943 case EVLIST_CTL_CMD_ENABLE:
1944 pr_info(EVLIST_ENABLED_MSG);
1946 case EVLIST_CTL_CMD_DISABLE:
1947 pr_info(EVLIST_DISABLED_MSG);
1949 case EVLIST_CTL_CMD_SNAPSHOT:
1950 hit_auxtrace_snapshot_trigger(rec);
1951 evlist__ctlfd_ack(rec->evlist);
1953 case EVLIST_CTL_CMD_ACK:
1954 case EVLIST_CTL_CMD_UNSUPPORTED:
1961 * When perf is starting the traced process, at the end events
1962 * die with the process and we wait for that. Thus no need to
1963 * disable events in this case.
1965 if (done && !disabled && !target__none(&opts->target)) {
1966 trigger_off(&auxtrace_snapshot_trigger);
1967 evlist__disable(rec->evlist);
1972 trigger_off(&auxtrace_snapshot_trigger);
1973 trigger_off(&switch_output_trigger);
1975 if (opts->auxtrace_snapshot_on_exit)
1976 record__auxtrace_snapshot_exit(rec);
1978 if (forks && workload_exec_errno) {
1979 char msg[STRERR_BUFSIZE];
1980 const char *emsg = str_error_r(workload_exec_errno, msg, sizeof(msg));
1981 pr_err("Workload failed: %s\n", emsg);
1987 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
1989 if (target__none(&rec->opts.target))
1990 record__synthesize_workload(rec, true);
1993 evlist__finalize_ctlfd(rec->evlist);
1994 record__mmap_read_all(rec, true);
1995 record__aio_mmap_read_sync(rec);
1997 if (rec->session->bytes_transferred && rec->session->bytes_compressed) {
1998 ratio = (float)rec->session->bytes_transferred/(float)rec->session->bytes_compressed;
1999 session->header.env.comp_ratio = ratio + 0.5;
2005 if (!child_finished)
2006 kill(rec->evlist->workload.pid, SIGTERM);
2012 else if (WIFEXITED(exit_status))
2013 status = WEXITSTATUS(exit_status);
2014 else if (WIFSIGNALED(exit_status))
2015 signr = WTERMSIG(exit_status);
2019 record__synthesize(rec, true);
2020 /* this will be recalculated during process_buildids() */
2024 if (!rec->timestamp_filename) {
2025 record__finish_output(rec);
2027 fd = record__switch_output(rec, true);
2030 goto out_delete_session;
2035 perf_hooks__invoke_record_end();
2037 if (!err && !quiet) {
2039 const char *postfix = rec->timestamp_filename ?
2040 ".<timestamp>" : "";
2042 if (rec->samples && !rec->opts.full_auxtrace)
2043 scnprintf(samples, sizeof(samples),
2044 " (%" PRIu64 " samples)", rec->samples);
2048 fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s",
2049 perf_data__size(data) / 1024.0 / 1024.0,
2050 data->path, postfix, samples);
2052 fprintf(stderr, ", compressed (original %.3f MB, ratio is %.3f)",
2053 rec->session->bytes_transferred / 1024.0 / 1024.0,
2056 fprintf(stderr, " ]\n");
2060 #ifdef HAVE_EVENTFD_SUPPORT
2064 zstd_fini(&session->zstd_data);
2065 perf_session__delete(session);
2067 if (!opts->no_bpf_event)
2068 evlist__stop_sb_thread(rec->sb_evlist);
2072 static void callchain_debug(struct callchain_param *callchain)
2074 static const char *str[CALLCHAIN_MAX] = { "NONE", "FP", "DWARF", "LBR" };
2076 pr_debug("callchain: type %s\n", str[callchain->record_mode]);
2078 if (callchain->record_mode == CALLCHAIN_DWARF)
2079 pr_debug("callchain: stack dump size %d\n",
2080 callchain->dump_size);
2083 int record_opts__parse_callchain(struct record_opts *record,
2084 struct callchain_param *callchain,
2085 const char *arg, bool unset)
2088 callchain->enabled = !unset;
2090 /* --no-call-graph */
2092 callchain->record_mode = CALLCHAIN_NONE;
2093 pr_debug("callchain: disabled\n");
2097 ret = parse_callchain_record_opt(arg, callchain);
2099 /* Enable data address sampling for DWARF unwind. */
2100 if (callchain->record_mode == CALLCHAIN_DWARF)
2101 record->sample_address = true;
2102 callchain_debug(callchain);
2108 int record_parse_callchain_opt(const struct option *opt,
2112 return record_opts__parse_callchain(opt->value, &callchain_param, arg, unset);
2115 int record_callchain_opt(const struct option *opt,
2116 const char *arg __maybe_unused,
2117 int unset __maybe_unused)
2119 struct callchain_param *callchain = opt->value;
2121 callchain->enabled = true;
2123 if (callchain->record_mode == CALLCHAIN_NONE)
2124 callchain->record_mode = CALLCHAIN_FP;
2126 callchain_debug(callchain);
2130 static int perf_record_config(const char *var, const char *value, void *cb)
2132 struct record *rec = cb;
2134 if (!strcmp(var, "record.build-id")) {
2135 if (!strcmp(value, "cache"))
2136 rec->no_buildid_cache = false;
2137 else if (!strcmp(value, "no-cache"))
2138 rec->no_buildid_cache = true;
2139 else if (!strcmp(value, "skip"))
2140 rec->no_buildid = true;
2145 if (!strcmp(var, "record.call-graph")) {
2146 var = "call-graph.record-mode";
2147 return perf_default_config(var, value, cb);
2149 #ifdef HAVE_AIO_SUPPORT
2150 if (!strcmp(var, "record.aio")) {
2151 rec->opts.nr_cblocks = strtol(value, NULL, 0);
2152 if (!rec->opts.nr_cblocks)
2153 rec->opts.nr_cblocks = nr_cblocks_default;
2161 static int record__parse_affinity(const struct option *opt, const char *str, int unset)
2163 struct record_opts *opts = (struct record_opts *)opt->value;
2168 if (!strcasecmp(str, "node"))
2169 opts->affinity = PERF_AFFINITY_NODE;
2170 else if (!strcasecmp(str, "cpu"))
2171 opts->affinity = PERF_AFFINITY_CPU;
2176 static int parse_output_max_size(const struct option *opt,
2177 const char *str, int unset)
2179 unsigned long *s = (unsigned long *)opt->value;
2180 static struct parse_tag tags_size[] = {
2181 { .tag = 'B', .mult = 1 },
2182 { .tag = 'K', .mult = 1 << 10 },
2183 { .tag = 'M', .mult = 1 << 20 },
2184 { .tag = 'G', .mult = 1 << 30 },
2194 val = parse_tag_value(str, tags_size);
2195 if (val != (unsigned long) -1) {
2203 static int record__parse_mmap_pages(const struct option *opt,
2205 int unset __maybe_unused)
2207 struct record_opts *opts = opt->value;
2209 unsigned int mmap_pages;
2224 ret = __evlist__parse_mmap_pages(&mmap_pages, s);
2227 opts->mmap_pages = mmap_pages;
2235 ret = __evlist__parse_mmap_pages(&mmap_pages, p + 1);
2239 opts->auxtrace_mmap_pages = mmap_pages;
2246 static int parse_control_option(const struct option *opt,
2248 int unset __maybe_unused)
2250 struct record_opts *opts = opt->value;
2252 return evlist__parse_control(str, &opts->ctl_fd, &opts->ctl_fd_ack, &opts->ctl_fd_close);
2255 static void switch_output_size_warn(struct record *rec)
2257 u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
2258 struct switch_output *s = &rec->switch_output;
2262 if (s->size < wakeup_size) {
2265 unit_number__scnprintf(buf, sizeof(buf), wakeup_size);
2266 pr_warning("WARNING: switch-output data size lower than "
2267 "wakeup kernel buffer size (%s) "
2268 "expect bigger perf.data sizes\n", buf);
2272 static int switch_output_setup(struct record *rec)
2274 struct switch_output *s = &rec->switch_output;
2275 static struct parse_tag tags_size[] = {
2276 { .tag = 'B', .mult = 1 },
2277 { .tag = 'K', .mult = 1 << 10 },
2278 { .tag = 'M', .mult = 1 << 20 },
2279 { .tag = 'G', .mult = 1 << 30 },
2282 static struct parse_tag tags_time[] = {
2283 { .tag = 's', .mult = 1 },
2284 { .tag = 'm', .mult = 60 },
2285 { .tag = 'h', .mult = 60*60 },
2286 { .tag = 'd', .mult = 60*60*24 },
2292 * If we're using --switch-output-events, then we imply its
2293 * --switch-output=signal, as we'll send a SIGUSR2 from the side band
2294 * thread to its parent.
2296 if (rec->switch_output_event_set)
2302 if (!strcmp(s->str, "signal")) {
2305 pr_debug("switch-output with SIGUSR2 signal\n");
2309 val = parse_tag_value(s->str, tags_size);
2310 if (val != (unsigned long) -1) {
2312 pr_debug("switch-output with %s size threshold\n", s->str);
2316 val = parse_tag_value(s->str, tags_time);
2317 if (val != (unsigned long) -1) {
2319 pr_debug("switch-output with %s time threshold (%lu seconds)\n",
2327 rec->timestamp_filename = true;
2330 if (s->size && !rec->opts.no_buffering)
2331 switch_output_size_warn(rec);
2336 static const char * const __record_usage[] = {
2337 "perf record [<options>] [<command>]",
2338 "perf record [<options>] -- <command> [<options>]",
2341 const char * const *record_usage = __record_usage;
2343 static int build_id__process_mmap(struct perf_tool *tool, union perf_event *event,
2344 struct perf_sample *sample, struct machine *machine)
2347 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2348 * no need to add them twice.
2350 if (!(event->header.misc & PERF_RECORD_MISC_USER))
2352 return perf_event__process_mmap(tool, event, sample, machine);
2355 static int build_id__process_mmap2(struct perf_tool *tool, union perf_event *event,
2356 struct perf_sample *sample, struct machine *machine)
2359 * We already have the kernel maps, put in place via perf_session__create_kernel_maps()
2360 * no need to add them twice.
2362 if (!(event->header.misc & PERF_RECORD_MISC_USER))
2365 return perf_event__process_mmap2(tool, event, sample, machine);
2369 * XXX Ideally would be local to cmd_record() and passed to a record__new
2370 * because we need to have access to it in record__exit, that is called
2371 * after cmd_record() exits, but since record_options need to be accessible to
2372 * builtin-script, leave it here.
2374 * At least we don't ouch it in all the other functions here directly.
2376 * Just say no to tons of global variables, sigh.
2378 static struct record record = {
2380 .sample_time = true,
2381 .mmap_pages = UINT_MAX,
2382 .user_freq = UINT_MAX,
2383 .user_interval = ULLONG_MAX,
2387 .default_per_cpu = true,
2389 .mmap_flush = MMAP_FLUSH_DEFAULT,
2390 .nr_threads_synthesize = 1,
2395 .sample = process_sample_event,
2396 .fork = perf_event__process_fork,
2397 .exit = perf_event__process_exit,
2398 .comm = perf_event__process_comm,
2399 .namespaces = perf_event__process_namespaces,
2400 .mmap = build_id__process_mmap,
2401 .mmap2 = build_id__process_mmap2,
2402 .ordered_events = true,
2406 const char record_callchain_help[] = CALLCHAIN_RECORD_HELP
2407 "\n\t\t\t\tDefault: fp";
2409 static bool dry_run;
2412 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
2413 * with it and switch to use the library functions in perf_evlist that came
2414 * from builtin-record.c, i.e. use record_opts,
2415 * evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
2418 static struct option __record_options[] = {
2419 OPT_CALLBACK('e', "event", &record.evlist, "event",
2420 "event selector. use 'perf list' to list available events",
2421 parse_events_option),
2422 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
2423 "event filter", parse_filter),
2424 OPT_CALLBACK_NOOPT(0, "exclude-perf", &record.evlist,
2425 NULL, "don't record events from perf itself",
2427 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
2428 "record events on existing process id"),
2429 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
2430 "record events on existing thread id"),
2431 OPT_INTEGER('r', "realtime", &record.realtime_prio,
2432 "collect data with this RT SCHED_FIFO priority"),
2433 OPT_BOOLEAN(0, "no-buffering", &record.opts.no_buffering,
2434 "collect data without buffering"),
2435 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
2436 "collect raw sample records from all opened counters"),
2437 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
2438 "system-wide collection from all CPUs"),
2439 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
2440 "list of cpus to monitor"),
2441 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
2442 OPT_STRING('o', "output", &record.data.path, "file",
2443 "output file name"),
2444 OPT_BOOLEAN_SET('i', "no-inherit", &record.opts.no_inherit,
2445 &record.opts.no_inherit_set,
2446 "child tasks do not inherit counters"),
2447 OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
2448 "synthesize non-sample events at the end of output"),
2449 OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
2450 OPT_BOOLEAN(0, "no-bpf-event", &record.opts.no_bpf_event, "do not record bpf events"),
2451 OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
2452 "Fail if the specified frequency can't be used"),
2453 OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
2454 "profile at this frequency",
2455 record__parse_freq),
2456 OPT_CALLBACK('m', "mmap-pages", &record.opts, "pages[,pages]",
2457 "number of mmap data pages and AUX area tracing mmap pages",
2458 record__parse_mmap_pages),
2459 OPT_CALLBACK(0, "mmap-flush", &record.opts, "number",
2460 "Minimal number of bytes that is extracted from mmap data pages (default: 1)",
2461 record__mmap_flush_parse),
2462 OPT_BOOLEAN(0, "group", &record.opts.group,
2463 "put the counters into a counter group"),
2464 OPT_CALLBACK_NOOPT('g', NULL, &callchain_param,
2465 NULL, "enables call-graph recording" ,
2466 &record_callchain_opt),
2467 OPT_CALLBACK(0, "call-graph", &record.opts,
2468 "record_mode[,record_size]", record_callchain_help,
2469 &record_parse_callchain_opt),
2470 OPT_INCR('v', "verbose", &verbose,
2471 "be more verbose (show counter open errors, etc)"),
2472 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
2473 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
2474 "per thread counts"),
2475 OPT_BOOLEAN('d', "data", &record.opts.sample_address, "Record the sample addresses"),
2476 OPT_BOOLEAN(0, "phys-data", &record.opts.sample_phys_addr,
2477 "Record the sample physical addresses"),
2478 OPT_BOOLEAN(0, "sample-cpu", &record.opts.sample_cpu, "Record the sample cpu"),
2479 OPT_BOOLEAN_SET('T', "timestamp", &record.opts.sample_time,
2480 &record.opts.sample_time_set,
2481 "Record the sample timestamps"),
2482 OPT_BOOLEAN_SET('P', "period", &record.opts.period, &record.opts.period_set,
2483 "Record the sample period"),
2484 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
2486 OPT_BOOLEAN_SET('N', "no-buildid-cache", &record.no_buildid_cache,
2487 &record.no_buildid_cache_set,
2488 "do not update the buildid cache"),
2489 OPT_BOOLEAN_SET('B', "no-buildid", &record.no_buildid,
2490 &record.no_buildid_set,
2491 "do not collect buildids in perf.data"),
2492 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
2493 "monitor event in cgroup name only",
2495 OPT_INTEGER('D', "delay", &record.opts.initial_delay,
2496 "ms to wait before starting measurement after program start (-1: start with events disabled)"),
2497 OPT_BOOLEAN(0, "kcore", &record.opts.kcore, "copy /proc/kcore"),
2498 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
2501 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
2502 "branch any", "sample any taken branches",
2503 parse_branch_stack),
2505 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
2506 "branch filter mask", "branch stack filter modes",
2507 parse_branch_stack),
2508 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
2509 "sample by weight (on special events only)"),
2510 OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
2511 "sample transaction flags (special events only)"),
2512 OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
2513 "use per-thread mmaps"),
2514 OPT_CALLBACK_OPTARG('I', "intr-regs", &record.opts.sample_intr_regs, NULL, "any register",
2515 "sample selected machine registers on interrupt,"
2516 " use '-I?' to list register names", parse_intr_regs),
2517 OPT_CALLBACK_OPTARG(0, "user-regs", &record.opts.sample_user_regs, NULL, "any register",
2518 "sample selected machine registers on interrupt,"
2519 " use '--user-regs=?' to list register names", parse_user_regs),
2520 OPT_BOOLEAN(0, "running-time", &record.opts.running_time,
2521 "Record running/enabled time of read (:S) events"),
2522 OPT_CALLBACK('k', "clockid", &record.opts,
2523 "clockid", "clockid to use for events, see clock_gettime()",
2525 OPT_STRING_OPTARG('S', "snapshot", &record.opts.auxtrace_snapshot_opts,
2526 "opts", "AUX area tracing Snapshot Mode", ""),
2527 OPT_STRING_OPTARG(0, "aux-sample", &record.opts.auxtrace_sample_opts,
2528 "opts", "sample AUX area", ""),
2529 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
2530 "per thread proc mmap processing timeout in ms"),
2531 OPT_BOOLEAN(0, "namespaces", &record.opts.record_namespaces,
2532 "Record namespaces events"),
2533 OPT_BOOLEAN(0, "all-cgroups", &record.opts.record_cgroup,
2534 "Record cgroup events"),
2535 OPT_BOOLEAN_SET(0, "switch-events", &record.opts.record_switch_events,
2536 &record.opts.record_switch_events_set,
2537 "Record context switch events"),
2538 OPT_BOOLEAN_FLAG(0, "all-kernel", &record.opts.all_kernel,
2539 "Configure all used events to run in kernel space.",
2540 PARSE_OPT_EXCLUSIVE),
2541 OPT_BOOLEAN_FLAG(0, "all-user", &record.opts.all_user,
2542 "Configure all used events to run in user space.",
2543 PARSE_OPT_EXCLUSIVE),
2544 OPT_BOOLEAN(0, "kernel-callchains", &record.opts.kernel_callchains,
2545 "collect kernel callchains"),
2546 OPT_BOOLEAN(0, "user-callchains", &record.opts.user_callchains,
2547 "collect user callchains"),
2548 OPT_STRING(0, "clang-path", &llvm_param.clang_path, "clang path",
2549 "clang binary to use for compiling BPF scriptlets"),
2550 OPT_STRING(0, "clang-opt", &llvm_param.clang_opt, "clang options",
2551 "options passed to clang when compiling BPF scriptlets"),
2552 OPT_STRING(0, "vmlinux", &symbol_conf.vmlinux_name,
2553 "file", "vmlinux pathname"),
2554 OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
2555 "Record build-id of all DSOs regardless of hits"),
2556 OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
2557 "append timestamp to output filename"),
2558 OPT_BOOLEAN(0, "timestamp-boundary", &record.timestamp_boundary,
2559 "Record timestamp boundary (time of first/last samples)"),
2560 OPT_STRING_OPTARG_SET(0, "switch-output", &record.switch_output.str,
2561 &record.switch_output.set, "signal or size[BKMG] or time[smhd]",
2562 "Switch output when receiving SIGUSR2 (signal) or cross a size or time threshold",
2564 OPT_CALLBACK_SET(0, "switch-output-event", &record.sb_evlist, &record.switch_output_event_set, "switch output event",
2565 "switch output event selector. use 'perf list' to list available events",
2566 parse_events_option_new_evlist),
2567 OPT_INTEGER(0, "switch-max-files", &record.switch_output.num_files,
2568 "Limit number of switch output generated files"),
2569 OPT_BOOLEAN(0, "dry-run", &dry_run,
2570 "Parse options then exit"),
2571 #ifdef HAVE_AIO_SUPPORT
2572 OPT_CALLBACK_OPTARG(0, "aio", &record.opts,
2573 &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
2576 OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
2577 "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
2578 record__parse_affinity),
2579 #ifdef HAVE_ZSTD_SUPPORT
2580 OPT_CALLBACK_OPTARG('z', "compression-level", &record.opts, &comp_level_default,
2581 "n", "Compressed records using specified level (default: 1 - fastest compression, 22 - greatest compression)",
2582 record__parse_comp_level),
2584 OPT_CALLBACK(0, "max-size", &record.output_max_size,
2585 "size", "Limit the maximum size of the output file", parse_output_max_size),
2586 OPT_UINTEGER(0, "num-thread-synthesize",
2587 &record.opts.nr_threads_synthesize,
2588 "number of threads to run for event synthesis"),
2590 OPT_CALLBACK(0, "pfm-events", &record.evlist, "event",
2591 "libpfm4 event selector. use 'perf list' to list available events",
2592 parse_libpfm_events_option),
2594 OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
2595 "Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events,\n"
2596 "\t\t\t 'snapshot': AUX area tracing snapshot).\n"
2597 "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
2598 "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
2599 parse_control_option),
2603 struct option *record_options = __record_options;
2605 int cmd_record(int argc, const char **argv)
2608 struct record *rec = &record;
2609 char errbuf[BUFSIZ];
2611 setlocale(LC_ALL, "");
2613 #ifndef HAVE_LIBBPF_SUPPORT
2614 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, "NO_LIBBPF=1", c)
2615 set_nobuild('\0', "clang-path", true);
2616 set_nobuild('\0', "clang-opt", true);
2620 #ifndef HAVE_BPF_PROLOGUE
2621 # if !defined (HAVE_DWARF_SUPPORT)
2622 # define REASON "NO_DWARF=1"
2623 # elif !defined (HAVE_LIBBPF_SUPPORT)
2624 # define REASON "NO_LIBBPF=1"
2626 # define REASON "this architecture doesn't support BPF prologue"
2628 # define set_nobuild(s, l, c) set_option_nobuild(record_options, s, l, REASON, c)
2629 set_nobuild('\0', "vmlinux", true);
2634 rec->opts.affinity = PERF_AFFINITY_SYS;
2636 rec->evlist = evlist__new();
2637 if (rec->evlist == NULL)
2640 err = perf_config(perf_record_config, rec);
2644 argc = parse_options(argc, argv, record_options, record_usage,
2645 PARSE_OPT_STOP_AT_NON_OPTION);
2647 perf_quiet_option();
2649 /* Make system wide (-a) the default target. */
2650 if (!argc && target__none(&rec->opts.target))
2651 rec->opts.target.system_wide = true;
2653 if (nr_cgroups && !rec->opts.target.system_wide) {
2654 usage_with_options_msg(record_usage, record_options,
2655 "cgroup monitoring only available in system-wide mode");
2659 if (rec->opts.kcore)
2660 rec->data.is_dir = true;
2662 if (rec->opts.comp_level != 0) {
2663 pr_debug("Compression enabled, disabling build id collection at the end of the session.\n");
2664 rec->no_buildid = true;
2667 if (rec->opts.record_switch_events &&
2668 !perf_can_record_switch_events()) {
2669 ui__error("kernel does not support recording context switch events\n");
2670 parse_options_usage(record_usage, record_options, "switch-events", 0);
2675 if (switch_output_setup(rec)) {
2676 parse_options_usage(record_usage, record_options, "switch-output", 0);
2681 if (rec->switch_output.time) {
2682 signal(SIGALRM, alarm_sig_handler);
2683 alarm(rec->switch_output.time);
2686 if (rec->switch_output.num_files) {
2687 rec->switch_output.filenames = calloc(sizeof(char *),
2688 rec->switch_output.num_files);
2689 if (!rec->switch_output.filenames) {
2696 * Allow aliases to facilitate the lookup of symbols for address
2697 * filters. Refer to auxtrace_parse_filters().
2699 symbol_conf.allow_aliases = true;
2703 if (rec->opts.affinity != PERF_AFFINITY_SYS) {
2704 rec->affinity_mask.nbits = cpu__max_cpu();
2705 rec->affinity_mask.bits = bitmap_alloc(rec->affinity_mask.nbits);
2706 if (!rec->affinity_mask.bits) {
2707 pr_err("Failed to allocate thread mask for %zd cpus\n", rec->affinity_mask.nbits);
2711 pr_debug2("thread mask[%zd]: empty\n", rec->affinity_mask.nbits);
2714 err = record__auxtrace_init(rec);
2721 err = bpf__setup_stdout(rec->evlist);
2723 bpf__strerror_setup_stdout(rec->evlist, err, errbuf, sizeof(errbuf));
2724 pr_err("ERROR: Setup BPF stdout failed: %s\n",
2731 if (rec->no_buildid_cache || rec->no_buildid) {
2732 disable_buildid_cache();
2733 } else if (rec->switch_output.enabled) {
2735 * In 'perf record --switch-output', disable buildid
2736 * generation by default to reduce data file switching
2737 * overhead. Still generate buildid if they are required
2740 * perf record --switch-output --no-no-buildid \
2741 * --no-no-buildid-cache
2743 * Following code equals to:
2745 * if ((rec->no_buildid || !rec->no_buildid_set) &&
2746 * (rec->no_buildid_cache || !rec->no_buildid_cache_set))
2747 * disable_buildid_cache();
2749 bool disable = true;
2751 if (rec->no_buildid_set && !rec->no_buildid)
2753 if (rec->no_buildid_cache_set && !rec->no_buildid_cache)
2756 rec->no_buildid = true;
2757 rec->no_buildid_cache = true;
2758 disable_buildid_cache();
2762 if (record.opts.overwrite)
2763 record.opts.tail_synthesize = true;
2765 if (rec->evlist->core.nr_entries == 0 &&
2766 __evlist__add_default(rec->evlist, !record.opts.no_samples) < 0) {
2767 pr_err("Not enough memory for event selector list\n");
2771 if (rec->opts.target.tid && !rec->opts.no_inherit_set)
2772 rec->opts.no_inherit = true;
2774 err = target__validate(&rec->opts.target);
2776 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2777 ui__warning("%s\n", errbuf);
2780 err = target__parse_uid(&rec->opts.target);
2782 int saved_errno = errno;
2784 target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
2785 ui__error("%s", errbuf);
2791 /* Enable ignoring missing threads when -u/-p option is defined. */
2792 rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
2795 if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
2796 usage_with_options(record_usage, record_options);
2798 err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
2803 * We take all buildids when the file contains
2804 * AUX area tracing data because we do not decode the
2805 * trace because it would take too long.
2807 if (rec->opts.full_auxtrace)
2808 rec->buildid_all = true;
2810 if (rec->opts.text_poke) {
2811 err = record__config_text_poke(rec->evlist);
2813 pr_err("record__config_text_poke failed, error %d\n", err);
2818 if (record_opts__config(&rec->opts)) {
2823 if (rec->opts.nr_cblocks > nr_cblocks_max)
2824 rec->opts.nr_cblocks = nr_cblocks_max;
2825 pr_debug("nr_cblocks: %d\n", rec->opts.nr_cblocks);
2827 pr_debug("affinity: %s\n", affinity_tags[rec->opts.affinity]);
2828 pr_debug("mmap flush: %d\n", rec->opts.mmap_flush);
2830 if (rec->opts.comp_level > comp_level_max)
2831 rec->opts.comp_level = comp_level_max;
2832 pr_debug("comp level: %d\n", rec->opts.comp_level);
2834 err = __cmd_record(&record, argc, argv);
2836 bitmap_free(rec->affinity_mask.bits);
2837 evlist__delete(rec->evlist);
2839 auxtrace_record__free(rec->itr);
2841 evlist__close_control(rec->opts.ctl_fd, rec->opts.ctl_fd_ack, &rec->opts.ctl_fd_close);
2845 static void snapshot_sig_handler(int sig __maybe_unused)
2847 struct record *rec = &record;
2849 hit_auxtrace_snapshot_trigger(rec);
2851 if (switch_output_signal(rec))
2852 trigger_hit(&switch_output_trigger);
2855 static void alarm_sig_handler(int sig __maybe_unused)
2857 struct record *rec = &record;
2859 if (switch_output_time(rec))
2860 trigger_hit(&switch_output_trigger);