4 * Builtin record command: Record the profile of a workload
5 * (or a CPU, or a PID) into the perf.data output file - for
6 * later analysis via perf report.
8 #define _FILE_OFFSET_BITS 64
14 #include "util/build-id.h"
15 #include "util/util.h"
16 #include "util/parse-options.h"
17 #include "util/parse-events.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/session.h"
25 #include "util/tool.h"
26 #include "util/symbol.h"
27 #include "util/cpumap.h"
28 #include "util/thread_map.h"
38 static int __on_exit_count = 0;
39 typedef void (*on_exit_func_t) (int, void *);
40 static on_exit_func_t __on_exit_funcs[ATEXIT_MAX];
41 static void *__on_exit_args[ATEXIT_MAX];
42 static int __exitcode = 0;
43 static void __handle_on_exit_funcs(void);
44 static int on_exit(on_exit_func_t function, void *arg);
45 #define exit(x) (exit)(__exitcode = (x))
47 static int on_exit(on_exit_func_t function, void *arg)
49 if (__on_exit_count == ATEXIT_MAX)
51 else if (__on_exit_count == 0)
52 atexit(__handle_on_exit_funcs);
53 __on_exit_funcs[__on_exit_count] = function;
54 __on_exit_args[__on_exit_count++] = arg;
58 static void __handle_on_exit_funcs(void)
61 for (i = 0; i < __on_exit_count; i++)
62 __on_exit_funcs[i] (__exitcode, __on_exit_args[i]);
72 struct perf_tool tool;
73 struct perf_record_opts opts;
75 const char *output_name;
76 struct perf_evlist *evlist;
77 struct perf_session *session;
80 unsigned int page_size;
82 enum write_mode_t write_mode;
84 bool no_buildid_cache;
89 off_t post_processing_offset;
92 static void advance_output(struct perf_record *rec, size_t size)
94 rec->bytes_written += size;
97 static int write_output(struct perf_record *rec, void *buf, size_t size)
100 int ret = write(rec->output, buf, size);
103 pr_err("failed to write\n");
110 rec->bytes_written += ret;
116 static int process_synthesized_event(struct perf_tool *tool,
117 union perf_event *event,
118 struct perf_sample *sample __maybe_unused,
119 struct machine *machine __maybe_unused)
121 struct perf_record *rec = container_of(tool, struct perf_record, tool);
122 if (write_output(rec, event, event->header.size) < 0)
128 static int perf_record__mmap_read(struct perf_record *rec,
129 struct perf_mmap *md)
131 unsigned int head = perf_mmap__read_head(md);
132 unsigned int old = md->prev;
133 unsigned char *data = md->base + rec->page_size;
145 if ((old & md->mask) + size != (head & md->mask)) {
146 buf = &data[old & md->mask];
147 size = md->mask + 1 - (old & md->mask);
150 if (write_output(rec, buf, size) < 0) {
156 buf = &data[old & md->mask];
160 if (write_output(rec, buf, size) < 0) {
166 perf_mmap__write_tail(md, old);
172 static volatile int done = 0;
173 static volatile int signr = -1;
174 static volatile int child_finished = 0;
176 static void sig_handler(int sig)
185 static void perf_record__sig_exit(int exit_status __maybe_unused, void *arg)
187 struct perf_record *rec = arg;
190 if (rec->evlist->workload.pid > 0) {
192 kill(rec->evlist->workload.pid, SIGTERM);
195 if (WIFSIGNALED(status))
196 psignal(WTERMSIG(status), rec->progname);
199 if (signr == -1 || signr == SIGUSR1)
202 signal(signr, SIG_DFL);
203 kill(getpid(), signr);
206 static bool perf_evlist__equal(struct perf_evlist *evlist,
207 struct perf_evlist *other)
209 struct perf_evsel *pos, *pair;
211 if (evlist->nr_entries != other->nr_entries)
214 pair = perf_evlist__first(other);
216 list_for_each_entry(pos, &evlist->entries, node) {
217 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
219 pair = perf_evsel__next(pair);
225 static int perf_record__open(struct perf_record *rec)
228 struct perf_evsel *pos;
229 struct perf_evlist *evlist = rec->evlist;
230 struct perf_session *session = rec->session;
231 struct perf_record_opts *opts = &rec->opts;
234 perf_evlist__config(evlist, opts);
236 list_for_each_entry(pos, &evlist->entries, node) {
238 if (perf_evsel__open(pos, evlist->cpus, evlist->threads) < 0) {
239 if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
241 ui__warning("%s\n", msg);
246 perf_evsel__open_strerror(pos, &opts->target,
247 errno, msg, sizeof(msg));
248 ui__error("%s\n", msg);
253 if (perf_evlist__apply_filters(evlist)) {
254 error("failed to set filter with %d (%s)\n", errno,
260 if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
261 if (errno == EPERM) {
262 pr_err("Permission error mapping pages.\n"
263 "Consider increasing "
264 "/proc/sys/kernel/perf_event_mlock_kb,\n"
265 "or try again with a smaller value of -m/--mmap_pages.\n"
266 "(current value: %d)\n", opts->mmap_pages);
268 } else if (!is_power_of_2(opts->mmap_pages) &&
269 (opts->mmap_pages != UINT_MAX)) {
270 pr_err("--mmap_pages/-m value must be a power of two.");
273 pr_err("failed to mmap with %d (%s)\n", errno, strerror(errno));
280 session->evlist = evlist;
282 if (!perf_evlist__equal(session->evlist, evlist)) {
283 fprintf(stderr, "incompatible append\n");
289 perf_session__set_id_hdr_size(session);
294 static int process_buildids(struct perf_record *rec)
296 u64 size = lseek(rec->output, 0, SEEK_CUR);
301 rec->session->fd = rec->output;
302 return __perf_session__process_events(rec->session, rec->post_processing_offset,
303 size - rec->post_processing_offset,
304 size, &build_id__mark_dso_hit_ops);
307 static void perf_record__exit(int status, void *arg)
309 struct perf_record *rec = arg;
314 if (!rec->opts.pipe_output) {
315 rec->session->header.data_size += rec->bytes_written;
317 if (!rec->no_buildid)
318 process_buildids(rec);
319 perf_session__write_header(rec->session, rec->evlist,
321 perf_session__delete(rec->session);
322 perf_evlist__delete(rec->evlist);
327 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
330 struct perf_tool *tool = data;
332 *As for guest kernel when processing subcommand record&report,
333 *we arrange module mmap prior to guest kernel mmap and trigger
334 *a preload dso because default guest module symbols are loaded
335 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
336 *method is used to avoid symbol missing when the first addr is
337 *in module instead of in guest kernel.
339 err = perf_event__synthesize_modules(tool, process_synthesized_event,
342 pr_err("Couldn't record guest kernel [%d]'s reference"
343 " relocation symbol.\n", machine->pid);
346 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
347 * have no _text sometimes.
349 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
352 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
355 pr_err("Couldn't record guest kernel [%d]'s reference"
356 " relocation symbol.\n", machine->pid);
359 static struct perf_event_header finished_round_event = {
360 .size = sizeof(struct perf_event_header),
361 .type = PERF_RECORD_FINISHED_ROUND,
364 static int perf_record__mmap_read_all(struct perf_record *rec)
369 for (i = 0; i < rec->evlist->nr_mmaps; i++) {
370 if (rec->evlist->mmap[i].base) {
371 if (perf_record__mmap_read(rec, &rec->evlist->mmap[i]) != 0) {
378 if (perf_header__has_feat(&rec->session->header, HEADER_TRACING_DATA))
379 rc = write_output(rec, &finished_round_event,
380 sizeof(finished_round_event));
386 static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
390 int err, output, feat;
391 unsigned long waking = 0;
392 const bool forks = argc > 0;
393 struct machine *machine;
394 struct perf_tool *tool = &rec->tool;
395 struct perf_record_opts *opts = &rec->opts;
396 struct perf_evlist *evsel_list = rec->evlist;
397 const char *output_name = rec->output_name;
398 struct perf_session *session;
399 bool disabled = false;
401 rec->progname = argv[0];
403 rec->page_size = sysconf(_SC_PAGE_SIZE);
405 on_exit(perf_record__sig_exit, rec);
406 signal(SIGCHLD, sig_handler);
407 signal(SIGINT, sig_handler);
408 signal(SIGUSR1, sig_handler);
411 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
412 opts->pipe_output = true;
414 rec->output_name = output_name = "perf.data";
417 if (!strcmp(output_name, "-"))
418 opts->pipe_output = true;
419 else if (!stat(output_name, &st) && st.st_size) {
420 if (rec->write_mode == WRITE_FORCE) {
421 char oldname[PATH_MAX];
422 snprintf(oldname, sizeof(oldname), "%s.old",
425 rename(output_name, oldname);
427 } else if (rec->write_mode == WRITE_APPEND) {
428 rec->write_mode = WRITE_FORCE;
432 flags = O_CREAT|O_RDWR;
433 if (rec->write_mode == WRITE_APPEND)
438 if (opts->pipe_output)
439 output = STDOUT_FILENO;
441 output = open(output_name, flags, S_IRUSR | S_IWUSR);
443 perror("failed to create output file");
447 rec->output = output;
449 session = perf_session__new(output_name, O_WRONLY,
450 rec->write_mode == WRITE_FORCE, false, NULL);
451 if (session == NULL) {
452 pr_err("Not enough memory for reading perf file header\n");
456 rec->session = session;
458 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
459 perf_header__set_feat(&session->header, feat);
462 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
464 if (!have_tracepoints(&evsel_list->entries))
465 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
467 if (!rec->opts.branch_stack)
468 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
470 if (!rec->file_new) {
471 err = perf_session__read_header(session, output);
473 goto out_delete_session;
477 err = perf_evlist__prepare_workload(evsel_list, opts, argv);
479 pr_err("Couldn't run the workload!\n");
480 goto out_delete_session;
484 if (perf_record__open(rec) != 0) {
486 goto out_delete_session;
489 if (!evsel_list->nr_groups)
490 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
493 * perf_session__delete(session) will be called at perf_record__exit()
495 on_exit(perf_record__exit, rec);
497 if (opts->pipe_output) {
498 err = perf_header__write_pipe(output);
500 goto out_delete_session;
501 } else if (rec->file_new) {
502 err = perf_session__write_header(session, evsel_list,
505 goto out_delete_session;
509 && !perf_header__has_feat(&session->header, HEADER_BUILD_ID)) {
510 pr_err("Couldn't generate buildids. "
511 "Use --no-buildid to profile anyway.\n");
513 goto out_delete_session;
516 rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
518 machine = &session->machines.host;
520 if (opts->pipe_output) {
521 err = perf_event__synthesize_attrs(tool, session,
522 process_synthesized_event);
524 pr_err("Couldn't synthesize attrs.\n");
525 goto out_delete_session;
528 err = perf_event__synthesize_event_types(tool, process_synthesized_event,
531 pr_err("Couldn't synthesize event_types.\n");
532 goto out_delete_session;
535 if (have_tracepoints(&evsel_list->entries)) {
537 * FIXME err <= 0 here actually means that
538 * there were no tracepoints so its not really
539 * an error, just that we don't need to
540 * synthesize anything. We really have to
541 * return this more properly and also
542 * propagate errors that now are calling die()
544 err = perf_event__synthesize_tracing_data(tool, output, evsel_list,
545 process_synthesized_event);
547 pr_err("Couldn't record tracing data.\n");
548 goto out_delete_session;
550 advance_output(rec, err);
554 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
557 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
560 pr_err("Couldn't record kernel reference relocation symbol\n"
561 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
562 "Check /proc/kallsyms permission or run as root.\n");
564 err = perf_event__synthesize_modules(tool, process_synthesized_event,
567 pr_err("Couldn't record kernel module information.\n"
568 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
569 "Check /proc/modules permission or run as root.\n");
572 machines__process_guests(&session->machines,
573 perf_event__synthesize_guest_os, tool);
576 if (!opts->target.system_wide)
577 err = perf_event__synthesize_thread_map(tool, evsel_list->threads,
578 process_synthesized_event,
581 err = perf_event__synthesize_threads(tool, process_synthesized_event,
585 goto out_delete_session;
587 if (rec->realtime_prio) {
588 struct sched_param param;
590 param.sched_priority = rec->realtime_prio;
591 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
592 pr_err("Could not set realtime priority.\n");
594 goto out_delete_session;
599 * When perf is starting the traced process, all the events
600 * (apart from group members) have enable_on_exec=1 set,
601 * so don't spoil it by prematurely enabling them.
603 if (!perf_target__none(&opts->target))
604 perf_evlist__enable(evsel_list);
610 perf_evlist__start_workload(evsel_list);
613 int hits = rec->samples;
615 if (perf_record__mmap_read_all(rec) < 0) {
617 goto out_delete_session;
620 if (hits == rec->samples) {
623 err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
628 * When perf is starting the traced process, at the end events
629 * die with the process and we wait for that. Thus no need to
630 * disable events in this case.
632 if (done && !disabled && !perf_target__none(&opts->target)) {
633 perf_evlist__disable(evsel_list);
638 if (quiet || signr == SIGUSR1)
641 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
644 * Approximate RIP event size: 24 bytes.
647 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
648 (double)rec->bytes_written / 1024.0 / 1024.0,
650 rec->bytes_written / 24);
655 perf_session__delete(session);
659 #define BRANCH_OPT(n, m) \
660 { .name = n, .mode = (m) }
662 #define BRANCH_END { .name = NULL }
669 static const struct branch_mode branch_modes[] = {
670 BRANCH_OPT("u", PERF_SAMPLE_BRANCH_USER),
671 BRANCH_OPT("k", PERF_SAMPLE_BRANCH_KERNEL),
672 BRANCH_OPT("hv", PERF_SAMPLE_BRANCH_HV),
673 BRANCH_OPT("any", PERF_SAMPLE_BRANCH_ANY),
674 BRANCH_OPT("any_call", PERF_SAMPLE_BRANCH_ANY_CALL),
675 BRANCH_OPT("any_ret", PERF_SAMPLE_BRANCH_ANY_RETURN),
676 BRANCH_OPT("ind_call", PERF_SAMPLE_BRANCH_IND_CALL),
681 parse_branch_stack(const struct option *opt, const char *str, int unset)
684 (PERF_SAMPLE_BRANCH_USER |\
685 PERF_SAMPLE_BRANCH_KERNEL |\
686 PERF_SAMPLE_BRANCH_HV)
688 uint64_t *mode = (uint64_t *)opt->value;
689 const struct branch_mode *br;
690 char *s, *os = NULL, *p;
697 * cannot set it twice, -b + --branch-filter for instance
702 /* str may be NULL in case no arg is passed to -b */
704 /* because str is read-only */
705 s = os = strdup(str);
714 for (br = branch_modes; br->name; br++) {
715 if (!strcasecmp(s, br->name))
719 ui__warning("unknown branch filter %s,"
720 " check man page\n", s);
734 /* default to any branch */
735 if ((*mode & ~ONLY_PLM) == 0) {
736 *mode = PERF_SAMPLE_BRANCH_ANY;
743 #ifdef LIBUNWIND_SUPPORT
744 static int get_stack_size(char *str, unsigned long *_size)
748 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
750 size = strtoul(str, &endptr, 0);
756 size = round_up(size, sizeof(u64));
757 if (!size || size > max_size)
765 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
769 #endif /* LIBUNWIND_SUPPORT */
771 int record_parse_callchain_opt(const struct option *opt,
772 const char *arg, int unset)
774 struct perf_record_opts *opts = opt->value;
775 char *tok, *name, *saveptr = NULL;
779 /* --no-call-graph */
783 /* We specified default option if none is provided. */
786 /* We need buffer that we know we can write to. */
787 buf = malloc(strlen(arg) + 1);
793 tok = strtok_r((char *)buf, ",", &saveptr);
794 name = tok ? : (char *)buf;
797 /* Framepointer style */
798 if (!strncmp(name, "fp", sizeof("fp"))) {
799 if (!strtok_r(NULL, ",", &saveptr)) {
800 opts->call_graph = CALLCHAIN_FP;
803 pr_err("callchain: No more arguments "
804 "needed for -g fp\n");
807 #ifdef LIBUNWIND_SUPPORT
809 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
810 const unsigned long default_stack_dump_size = 8192;
813 opts->call_graph = CALLCHAIN_DWARF;
814 opts->stack_dump_size = default_stack_dump_size;
816 tok = strtok_r(NULL, ",", &saveptr);
818 unsigned long size = 0;
820 ret = get_stack_size(tok, &size);
821 opts->stack_dump_size = size;
825 pr_debug("callchain: stack dump size %d\n",
826 opts->stack_dump_size);
827 #endif /* LIBUNWIND_SUPPORT */
829 pr_err("callchain: Unknown -g option "
839 pr_debug("callchain: type %d\n", opts->call_graph);
844 static const char * const record_usage[] = {
845 "perf record [<options>] [<command>]",
846 "perf record [<options>] -- <command> [<options>]",
851 * XXX Ideally would be local to cmd_record() and passed to a perf_record__new
852 * because we need to have access to it in perf_record__exit, that is called
853 * after cmd_record() exits, but since record_options need to be accessible to
854 * builtin-script, leave it here.
856 * At least we don't ouch it in all the other functions here directly.
858 * Just say no to tons of global variables, sigh.
860 static struct perf_record record = {
862 .mmap_pages = UINT_MAX,
863 .user_freq = UINT_MAX,
864 .user_interval = ULLONG_MAX,
870 .write_mode = WRITE_FORCE,
874 #define CALLCHAIN_HELP "do call-graph (stack chain/backtrace) recording: "
876 #ifdef LIBUNWIND_SUPPORT
877 const char record_callchain_help[] = CALLCHAIN_HELP "[fp] dwarf";
879 const char record_callchain_help[] = CALLCHAIN_HELP "[fp]";
883 * XXX Will stay a global variable till we fix builtin-script.c to stop messing
884 * with it and switch to use the library functions in perf_evlist that came
885 * from builtin-record.c, i.e. use perf_record_opts,
886 * perf_evlist__prepare_workload, etc instead of fork+exec'in 'perf record',
889 const struct option record_options[] = {
890 OPT_CALLBACK('e', "event", &record.evlist, "event",
891 "event selector. use 'perf list' to list available events",
892 parse_events_option),
893 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
894 "event filter", parse_filter),
895 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
896 "record events on existing process id"),
897 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
898 "record events on existing thread id"),
899 OPT_INTEGER('r', "realtime", &record.realtime_prio,
900 "collect data with this RT SCHED_FIFO priority"),
901 OPT_BOOLEAN('D', "no-delay", &record.opts.no_delay,
902 "collect data without buffering"),
903 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
904 "collect raw sample records from all opened counters"),
905 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
906 "system-wide collection from all CPUs"),
907 OPT_BOOLEAN('A', "append", &record.append_file,
908 "append to the output file to do incremental profiling"),
909 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
910 "list of cpus to monitor"),
911 OPT_BOOLEAN('f', "force", &record.force,
912 "overwrite existing data file (deprecated)"),
913 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
914 OPT_STRING('o', "output", &record.output_name, "file",
916 OPT_BOOLEAN('i', "no-inherit", &record.opts.no_inherit,
917 "child tasks do not inherit counters"),
918 OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
919 OPT_UINTEGER('m', "mmap-pages", &record.opts.mmap_pages,
920 "number of mmap data pages"),
921 OPT_BOOLEAN(0, "group", &record.opts.group,
922 "put the counters into a counter group"),
923 OPT_CALLBACK_DEFAULT('g', "call-graph", &record.opts,
924 "mode[,dump_size]", record_callchain_help,
925 &record_parse_callchain_opt, "fp"),
926 OPT_INCR('v', "verbose", &verbose,
927 "be more verbose (show counter open errors, etc)"),
928 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
929 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
930 "per thread counts"),
931 OPT_BOOLEAN('d', "data", &record.opts.sample_address,
933 OPT_BOOLEAN('T', "timestamp", &record.opts.sample_time, "Sample timestamps"),
934 OPT_BOOLEAN('P', "period", &record.opts.period, "Sample period"),
935 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
937 OPT_BOOLEAN('N', "no-buildid-cache", &record.no_buildid_cache,
938 "do not update the buildid cache"),
939 OPT_BOOLEAN('B', "no-buildid", &record.no_buildid,
940 "do not collect buildids in perf.data"),
941 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
942 "monitor event in cgroup name only",
944 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
947 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
948 "branch any", "sample any taken branches",
951 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
952 "branch filter mask", "branch stack filter modes",
957 int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
960 struct perf_evsel *pos;
961 struct perf_evlist *evsel_list;
962 struct perf_record *rec = &record;
965 evsel_list = perf_evlist__new(NULL, NULL);
966 if (evsel_list == NULL)
969 rec->evlist = evsel_list;
971 argc = parse_options(argc, argv, record_options, record_usage,
972 PARSE_OPT_STOP_AT_NON_OPTION);
973 if (!argc && perf_target__none(&rec->opts.target))
974 usage_with_options(record_usage, record_options);
976 if (rec->force && rec->append_file) {
977 ui__error("Can't overwrite and append at the same time."
978 " You need to choose between -f and -A");
979 usage_with_options(record_usage, record_options);
980 } else if (rec->append_file) {
981 rec->write_mode = WRITE_APPEND;
983 rec->write_mode = WRITE_FORCE;
986 if (nr_cgroups && !rec->opts.target.system_wide) {
987 ui__error("cgroup monitoring only available in"
988 " system-wide mode\n");
989 usage_with_options(record_usage, record_options);
994 if (symbol_conf.kptr_restrict)
996 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
997 "check /proc/sys/kernel/kptr_restrict.\n\n"
998 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
999 "file is not found in the buildid cache or in the vmlinux path.\n\n"
1000 "Samples in kernel modules won't be resolved at all.\n\n"
1001 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1002 "even with a suitable vmlinux or kallsyms file.\n\n");
1004 if (rec->no_buildid_cache || rec->no_buildid)
1005 disable_buildid_cache();
1007 if (evsel_list->nr_entries == 0 &&
1008 perf_evlist__add_default(evsel_list) < 0) {
1009 pr_err("Not enough memory for event selector list\n");
1010 goto out_symbol_exit;
1013 err = perf_target__validate(&rec->opts.target);
1015 perf_target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1016 ui__warning("%s", errbuf);
1019 err = perf_target__parse_uid(&rec->opts.target);
1021 int saved_errno = errno;
1023 perf_target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1024 ui__error("%s", errbuf);
1031 if (perf_evlist__create_maps(evsel_list, &rec->opts.target) < 0)
1032 usage_with_options(record_usage, record_options);
1034 list_for_each_entry(pos, &evsel_list->entries, node) {
1035 if (perf_header__push_event(pos->attr.config, perf_evsel__name(pos)))
1039 if (rec->opts.user_interval != ULLONG_MAX)
1040 rec->opts.default_interval = rec->opts.user_interval;
1041 if (rec->opts.user_freq != UINT_MAX)
1042 rec->opts.freq = rec->opts.user_freq;
1045 * User specified count overrides default frequency.
1047 if (rec->opts.default_interval)
1049 else if (rec->opts.freq) {
1050 rec->opts.default_interval = rec->opts.freq;
1052 ui__error("frequency and count are zero, aborting\n");
1057 err = __cmd_record(&record, argc, argv);
1059 perf_evlist__delete_maps(evsel_list);