1
2
3
4
5
6
7
8#include "builtin.h"
9
10#include "perf.h"
11
12#include "util/build-id.h"
13#include "util/util.h"
14#include "util/parse-options.h"
15#include "util/parse-events.h"
16
17#include "util/header.h"
18#include "util/event.h"
19#include "util/evlist.h"
20#include "util/evsel.h"
21#include "util/debug.h"
22#include "util/session.h"
23#include "util/tool.h"
24#include "util/symbol.h"
25#include "util/cpumap.h"
26#include "util/thread_map.h"
27
28#include <unistd.h>
29#include <sched.h>
30#include <sys/mman.h>
31
32#ifndef HAVE_ON_EXIT
33#ifndef ATEXIT_MAX
34#define ATEXIT_MAX 32
35#endif
36static int __on_exit_count = 0;
37typedef void (*on_exit_func_t) (int, void *);
38static on_exit_func_t __on_exit_funcs[ATEXIT_MAX];
39static void *__on_exit_args[ATEXIT_MAX];
40static int __exitcode = 0;
41static void __handle_on_exit_funcs(void);
42static int on_exit(on_exit_func_t function, void *arg);
43#define exit(x) (exit)(__exitcode = (x))
44
45static int on_exit(on_exit_func_t function, void *arg)
46{
47 if (__on_exit_count == ATEXIT_MAX)
48 return -ENOMEM;
49 else if (__on_exit_count == 0)
50 atexit(__handle_on_exit_funcs);
51 __on_exit_funcs[__on_exit_count] = function;
52 __on_exit_args[__on_exit_count++] = arg;
53 return 0;
54}
55
56static void __handle_on_exit_funcs(void)
57{
58 int i;
59 for (i = 0; i < __on_exit_count; i++)
60 __on_exit_funcs[i] (__exitcode, __on_exit_args[i]);
61}
62#endif
63
64enum write_mode_t {
65 WRITE_FORCE,
66 WRITE_APPEND
67};
68
69struct perf_record {
70 struct perf_tool tool;
71 struct perf_record_opts opts;
72 u64 bytes_written;
73 const char *output_name;
74 struct perf_evlist *evlist;
75 struct perf_session *session;
76 const char *progname;
77 int output;
78 unsigned int page_size;
79 int realtime_prio;
80 enum write_mode_t write_mode;
81 bool no_buildid;
82 bool no_buildid_cache;
83 bool force;
84 bool file_new;
85 bool append_file;
86 long samples;
87 off_t post_processing_offset;
88};
89
90static void advance_output(struct perf_record *rec, size_t size)
91{
92 rec->bytes_written += size;
93}
94
95static int write_output(struct perf_record *rec, void *buf, size_t size)
96{
97 while (size) {
98 int ret = write(rec->output, buf, size);
99
100 if (ret < 0) {
101 pr_err("failed to write\n");
102 return -1;
103 }
104
105 size -= ret;
106 buf += ret;
107
108 rec->bytes_written += ret;
109 }
110
111 return 0;
112}
113
114static int process_synthesized_event(struct perf_tool *tool,
115 union perf_event *event,
116 struct perf_sample *sample __maybe_unused,
117 struct machine *machine __maybe_unused)
118{
119 struct perf_record *rec = container_of(tool, struct perf_record, tool);
120 if (write_output(rec, event, event->header.size) < 0)
121 return -1;
122
123 return 0;
124}
125
126static int perf_record__mmap_read(struct perf_record *rec,
127 struct perf_mmap *md)
128{
129 unsigned int head = perf_mmap__read_head(md);
130 unsigned int old = md->prev;
131 unsigned char *data = md->base + rec->page_size;
132 unsigned long size;
133 void *buf;
134 int rc = 0;
135
136 if (old == head)
137 return 0;
138
139 rec->samples++;
140
141 size = head - old;
142
143 if ((old & md->mask) + size != (head & md->mask)) {
144 buf = &data[old & md->mask];
145 size = md->mask + 1 - (old & md->mask);
146 old += size;
147
148 if (write_output(rec, buf, size) < 0) {
149 rc = -1;
150 goto out;
151 }
152 }
153
154 buf = &data[old & md->mask];
155 size = head - old;
156 old += size;
157
158 if (write_output(rec, buf, size) < 0) {
159 rc = -1;
160 goto out;
161 }
162
163 md->prev = old;
164 perf_mmap__write_tail(md, old);
165
166out:
167 return rc;
168}
169
170static volatile int done = 0;
171static volatile int signr = -1;
172static volatile int child_finished = 0;
173
174static void sig_handler(int sig)
175{
176 if (sig == SIGCHLD)
177 child_finished = 1;
178
179 done = 1;
180 signr = sig;
181}
182
183static void perf_record__sig_exit(int exit_status __maybe_unused, void *arg)
184{
185 struct perf_record *rec = arg;
186 int status;
187
188 if (rec->evlist->workload.pid > 0) {
189 if (!child_finished)
190 kill(rec->evlist->workload.pid, SIGTERM);
191
192 wait(&status);
193 if (WIFSIGNALED(status))
194 psignal(WTERMSIG(status), rec->progname);
195 }
196
197 if (signr == -1 || signr == SIGUSR1)
198 return;
199
200 signal(signr, SIG_DFL);
201 kill(getpid(), signr);
202}
203
204static bool perf_evlist__equal(struct perf_evlist *evlist,
205 struct perf_evlist *other)
206{
207 struct perf_evsel *pos, *pair;
208
209 if (evlist->nr_entries != other->nr_entries)
210 return false;
211
212 pair = perf_evlist__first(other);
213
214 list_for_each_entry(pos, &evlist->entries, node) {
215 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
216 return false;
217 pair = perf_evsel__next(pair);
218 }
219
220 return true;
221}
222
223static int perf_record__open(struct perf_record *rec)
224{
225 char msg[512];
226 struct perf_evsel *pos;
227 struct perf_evlist *evlist = rec->evlist;
228 struct perf_session *session = rec->session;
229 struct perf_record_opts *opts = &rec->opts;
230 int rc = 0;
231
232 perf_evlist__config(evlist, opts);
233
234 list_for_each_entry(pos, &evlist->entries, node) {
235try_again:
236 if (perf_evsel__open(pos, evlist->cpus, evlist->threads) < 0) {
237 if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
238 if (verbose)
239 ui__warning("%s\n", msg);
240 goto try_again;
241 }
242
243 rc = -errno;
244 perf_evsel__open_strerror(pos, &opts->target,
245 errno, msg, sizeof(msg));
246 ui__error("%s\n", msg);
247 goto out;
248 }
249 }
250
251 if (perf_evlist__apply_filters(evlist)) {
252 error("failed to set filter with %d (%s)\n", errno,
253 strerror(errno));
254 rc = -1;
255 goto out;
256 }
257
258 if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
259 if (errno == EPERM) {
260 pr_err("Permission error mapping pages.\n"
261 "Consider increasing "
262 "/proc/sys/kernel/perf_event_mlock_kb,\n"
263 "or try again with a smaller value of -m/--mmap_pages.\n"
264 "(current value: %d)\n", opts->mmap_pages);
265 rc = -errno;
266 } else if (!is_power_of_2(opts->mmap_pages) &&
267 (opts->mmap_pages != UINT_MAX)) {
268 pr_err("--mmap_pages/-m value must be a power of two.");
269 rc = -EINVAL;
270 } else {
271 pr_err("failed to mmap with %d (%s)\n", errno, strerror(errno));
272 rc = -errno;
273 }
274 goto out;
275 }
276
277 if (rec->file_new)
278 session->evlist = evlist;
279 else {
280 if (!perf_evlist__equal(session->evlist, evlist)) {
281 fprintf(stderr, "incompatible append\n");
282 rc = -1;
283 goto out;
284 }
285 }
286
287 perf_session__set_id_hdr_size(session);
288out:
289 return rc;
290}
291
292static int process_buildids(struct perf_record *rec)
293{
294 u64 size = lseek(rec->output, 0, SEEK_CUR);
295
296 if (size == 0)
297 return 0;
298
299 rec->session->fd = rec->output;
300 return __perf_session__process_events(rec->session, rec->post_processing_offset,
301 size - rec->post_processing_offset,
302 size, &build_id__mark_dso_hit_ops);
303}
304
305static void perf_record__exit(int status, void *arg)
306{
307 struct perf_record *rec = arg;
308
309 if (status != 0)
310 return;
311
312 if (!rec->opts.pipe_output) {
313 rec->session->header.data_size += rec->bytes_written;
314
315 if (!rec->no_buildid)
316 process_buildids(rec);
317 perf_session__write_header(rec->session, rec->evlist,
318 rec->output, true);
319 perf_session__delete(rec->session);
320 perf_evlist__delete(rec->evlist);
321 symbol__exit();
322 }
323}
324
325static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
326{
327 int err;
328 struct perf_tool *tool = data;
329
330
331
332
333
334
335
336
337 err = perf_event__synthesize_modules(tool, process_synthesized_event,
338 machine);
339 if (err < 0)
340 pr_err("Couldn't record guest kernel [%d]'s reference"
341 " relocation symbol.\n", machine->pid);
342
343
344
345
346
347 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
348 machine, "_text");
349 if (err < 0)
350 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
351 machine, "_stext");
352 if (err < 0)
353 pr_err("Couldn't record guest kernel [%d]'s reference"
354 " relocation symbol.\n", machine->pid);
355}
356
357static struct perf_event_header finished_round_event = {
358 .size = sizeof(struct perf_event_header),
359 .type = PERF_RECORD_FINISHED_ROUND,
360};
361
362static int perf_record__mmap_read_all(struct perf_record *rec)
363{
364 int i;
365 int rc = 0;
366
367 for (i = 0; i < rec->evlist->nr_mmaps; i++) {
368 if (rec->evlist->mmap[i].base) {
369 if (perf_record__mmap_read(rec, &rec->evlist->mmap[i]) != 0) {
370 rc = -1;
371 goto out;
372 }
373 }
374 }
375
376 if (perf_header__has_feat(&rec->session->header, HEADER_TRACING_DATA))
377 rc = write_output(rec, &finished_round_event,
378 sizeof(finished_round_event));
379
380out:
381 return rc;
382}
383
384static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
385{
386 struct stat st;
387 int flags;
388 int err, output, feat;
389 unsigned long waking = 0;
390 const bool forks = argc > 0;
391 struct machine *machine;
392 struct perf_tool *tool = &rec->tool;
393 struct perf_record_opts *opts = &rec->opts;
394 struct perf_evlist *evsel_list = rec->evlist;
395 const char *output_name = rec->output_name;
396 struct perf_session *session;
397 bool disabled = false;
398
399 rec->progname = argv[0];
400
401 rec->page_size = sysconf(_SC_PAGE_SIZE);
402
403 on_exit(perf_record__sig_exit, rec);
404 signal(SIGCHLD, sig_handler);
405 signal(SIGINT, sig_handler);
406 signal(SIGUSR1, sig_handler);
407
408 if (!output_name) {
409 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
410 opts->pipe_output = true;
411 else
412 rec->output_name = output_name = "perf.data";
413 }
414 if (output_name) {
415 if (!strcmp(output_name, "-"))
416 opts->pipe_output = true;
417 else if (!stat(output_name, &st) && st.st_size) {
418 if (rec->write_mode == WRITE_FORCE) {
419 char oldname[PATH_MAX];
420 snprintf(oldname, sizeof(oldname), "%s.old",
421 output_name);
422 unlink(oldname);
423 rename(output_name, oldname);
424 }
425 } else if (rec->write_mode == WRITE_APPEND) {
426 rec->write_mode = WRITE_FORCE;
427 }
428 }
429
430 flags = O_CREAT|O_RDWR;
431 if (rec->write_mode == WRITE_APPEND)
432 rec->file_new = 0;
433 else
434 flags |= O_TRUNC;
435
436 if (opts->pipe_output)
437 output = STDOUT_FILENO;
438 else
439 output = open(output_name, flags, S_IRUSR | S_IWUSR);
440 if (output < 0) {
441 perror("failed to create output file");
442 return -1;
443 }
444
445 rec->output = output;
446
447 session = perf_session__new(output_name, O_WRONLY,
448 rec->write_mode == WRITE_FORCE, false, NULL);
449 if (session == NULL) {
450 pr_err("Not enough memory for reading perf file header\n");
451 return -1;
452 }
453
454 rec->session = session;
455
456 for (feat = HEADER_FIRST_FEATURE; feat < HEADER_LAST_FEATURE; feat++)
457 perf_header__set_feat(&session->header, feat);
458
459 if (rec->no_buildid)
460 perf_header__clear_feat(&session->header, HEADER_BUILD_ID);
461
462 if (!have_tracepoints(&evsel_list->entries))
463 perf_header__clear_feat(&session->header, HEADER_TRACING_DATA);
464
465 if (!rec->opts.branch_stack)
466 perf_header__clear_feat(&session->header, HEADER_BRANCH_STACK);
467
468 if (!rec->file_new) {
469 err = perf_session__read_header(session, output);
470 if (err < 0)
471 goto out_delete_session;
472 }
473
474 if (forks) {
475 err = perf_evlist__prepare_workload(evsel_list, &opts->target,
476 argv, opts->pipe_output,
477 true);
478 if (err < 0) {
479 pr_err("Couldn't run the workload!\n");
480 goto out_delete_session;
481 }
482 }
483
484 if (perf_record__open(rec) != 0) {
485 err = -1;
486 goto out_delete_session;
487 }
488
489 if (!evsel_list->nr_groups)
490 perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
491
492
493
494
495 on_exit(perf_record__exit, rec);
496
497 if (opts->pipe_output) {
498 err = perf_header__write_pipe(output);
499 if (err < 0)
500 goto out_delete_session;
501 } else if (rec->file_new) {
502 err = perf_session__write_header(session, evsel_list,
503 output, false);
504 if (err < 0)
505 goto out_delete_session;
506 }
507
508 if (!rec->no_buildid
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");
512 err = -1;
513 goto out_delete_session;
514 }
515
516 rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
517
518 machine = &session->machines.host;
519
520 if (opts->pipe_output) {
521 err = perf_event__synthesize_attrs(tool, session,
522 process_synthesized_event);
523 if (err < 0) {
524 pr_err("Couldn't synthesize attrs.\n");
525 goto out_delete_session;
526 }
527
528 err = perf_event__synthesize_event_types(tool, process_synthesized_event,
529 machine);
530 if (err < 0) {
531 pr_err("Couldn't synthesize event_types.\n");
532 goto out_delete_session;
533 }
534
535 if (have_tracepoints(&evsel_list->entries)) {
536
537
538
539
540
541
542
543
544 err = perf_event__synthesize_tracing_data(tool, output, evsel_list,
545 process_synthesized_event);
546 if (err <= 0) {
547 pr_err("Couldn't record tracing data.\n");
548 goto out_delete_session;
549 }
550 advance_output(rec, err);
551 }
552 }
553
554 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
555 machine, "_text");
556 if (err < 0)
557 err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
558 machine, "_stext");
559 if (err < 0)
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");
563
564 err = perf_event__synthesize_modules(tool, process_synthesized_event,
565 machine);
566 if (err < 0)
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");
570
571 if (perf_guest) {
572 machines__process_guests(&session->machines,
573 perf_event__synthesize_guest_os, tool);
574 }
575
576 if (perf_target__has_task(&opts->target))
577 err = perf_event__synthesize_thread_map(tool, evsel_list->threads,
578 process_synthesized_event,
579 machine);
580 else if (perf_target__has_cpu(&opts->target))
581 err = perf_event__synthesize_threads(tool, process_synthesized_event,
582 machine);
583 else
584 err = 0;
585
586 if (err != 0)
587 goto out_delete_session;
588
589 if (rec->realtime_prio) {
590 struct sched_param param;
591
592 param.sched_priority = rec->realtime_prio;
593 if (sched_setscheduler(0, SCHED_FIFO, ¶m)) {
594 pr_err("Could not set realtime priority.\n");
595 err = -1;
596 goto out_delete_session;
597 }
598 }
599
600
601
602
603
604
605 if (!perf_target__none(&opts->target))
606 perf_evlist__enable(evsel_list);
607
608
609
610
611 if (forks)
612 perf_evlist__start_workload(evsel_list);
613
614 for (;;) {
615 int hits = rec->samples;
616
617 if (perf_record__mmap_read_all(rec) < 0) {
618 err = -1;
619 goto out_delete_session;
620 }
621
622 if (hits == rec->samples) {
623 if (done)
624 break;
625 err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
626 waking++;
627 }
628
629
630
631
632
633
634 if (done && !disabled && !perf_target__none(&opts->target)) {
635 perf_evlist__disable(evsel_list);
636 disabled = true;
637 }
638 }
639
640 if (quiet || signr == SIGUSR1)
641 return 0;
642
643 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
644
645
646
647
648 fprintf(stderr,
649 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
650 (double)rec->bytes_written / 1024.0 / 1024.0,
651 output_name,
652 rec->bytes_written / 24);
653
654 return 0;
655
656out_delete_session:
657 perf_session__delete(session);
658 return err;
659}
660
661#define BRANCH_OPT(n, m) \
662 { .name = n, .mode = (m) }
663
664#define BRANCH_END { .name = NULL }
665
666struct branch_mode {
667 const char *name;
668 int mode;
669};
670
671static const struct branch_mode branch_modes[] = {
672 BRANCH_OPT("u", PERF_SAMPLE_BRANCH_USER),
673 BRANCH_OPT("k", PERF_SAMPLE_BRANCH_KERNEL),
674 BRANCH_OPT("hv", PERF_SAMPLE_BRANCH_HV),
675 BRANCH_OPT("any", PERF_SAMPLE_BRANCH_ANY),
676 BRANCH_OPT("any_call", PERF_SAMPLE_BRANCH_ANY_CALL),
677 BRANCH_OPT("any_ret", PERF_SAMPLE_BRANCH_ANY_RETURN),
678 BRANCH_OPT("ind_call", PERF_SAMPLE_BRANCH_IND_CALL),
679 BRANCH_END
680};
681
682static int
683parse_branch_stack(const struct option *opt, const char *str, int unset)
684{
685#define ONLY_PLM \
686 (PERF_SAMPLE_BRANCH_USER |\
687 PERF_SAMPLE_BRANCH_KERNEL |\
688 PERF_SAMPLE_BRANCH_HV)
689
690 uint64_t *mode = (uint64_t *)opt->value;
691 const struct branch_mode *br;
692 char *s, *os = NULL, *p;
693 int ret = -1;
694
695 if (unset)
696 return 0;
697
698
699
700
701 if (*mode)
702 return -1;
703
704
705 if (str) {
706
707 s = os = strdup(str);
708 if (!s)
709 return -1;
710
711 for (;;) {
712 p = strchr(s, ',');
713 if (p)
714 *p = '\0';
715
716 for (br = branch_modes; br->name; br++) {
717 if (!strcasecmp(s, br->name))
718 break;
719 }
720 if (!br->name) {
721 ui__warning("unknown branch filter %s,"
722 " check man page\n", s);
723 goto error;
724 }
725
726 *mode |= br->mode;
727
728 if (!p)
729 break;
730
731 s = p + 1;
732 }
733 }
734 ret = 0;
735
736
737 if ((*mode & ~ONLY_PLM) == 0) {
738 *mode = PERF_SAMPLE_BRANCH_ANY;
739 }
740error:
741 free(os);
742 return ret;
743}
744
745#ifdef LIBUNWIND_SUPPORT
746static int get_stack_size(char *str, unsigned long *_size)
747{
748 char *endptr;
749 unsigned long size;
750 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64));
751
752 size = strtoul(str, &endptr, 0);
753
754 do {
755 if (*endptr)
756 break;
757
758 size = round_up(size, sizeof(u64));
759 if (!size || size > max_size)
760 break;
761
762 *_size = size;
763 return 0;
764
765 } while (0);
766
767 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n",
768 max_size, str);
769 return -1;
770}
771#endif
772
773int record_parse_callchain_opt(const struct option *opt,
774 const char *arg, int unset)
775{
776 struct perf_record_opts *opts = opt->value;
777 char *tok, *name, *saveptr = NULL;
778 char *buf;
779 int ret = -1;
780
781
782 if (unset)
783 return 0;
784
785
786 BUG_ON(!arg);
787
788
789 buf = malloc(strlen(arg) + 1);
790 if (!buf)
791 return -ENOMEM;
792
793 strcpy(buf, arg);
794
795 tok = strtok_r((char *)buf, ",", &saveptr);
796 name = tok ? : (char *)buf;
797
798 do {
799
800 if (!strncmp(name, "fp", sizeof("fp"))) {
801 if (!strtok_r(NULL, ",", &saveptr)) {
802 opts->call_graph = CALLCHAIN_FP;
803 ret = 0;
804 } else
805 pr_err("callchain: No more arguments "
806 "needed for -g fp\n");
807 break;
808
809#ifdef LIBUNWIND_SUPPORT
810
811 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) {
812 const unsigned long default_stack_dump_size = 8192;
813
814 ret = 0;
815 opts->call_graph = CALLCHAIN_DWARF;
816 opts->stack_dump_size = default_stack_dump_size;
817
818 tok = strtok_r(NULL, ",", &saveptr);
819 if (tok) {
820 unsigned long size = 0;
821
822 ret = get_stack_size(tok, &size);
823 opts->stack_dump_size = size;
824 }
825
826 if (!ret)
827 pr_debug("callchain: stack dump size %d\n",
828 opts->stack_dump_size);
829#endif
830 } else {
831 pr_err("callchain: Unknown -g option "
832 "value: %s\n", arg);
833 break;
834 }
835
836 } while (0);
837
838 free(buf);
839
840 if (!ret)
841 pr_debug("callchain: type %d\n", opts->call_graph);
842
843 return ret;
844}
845
846static const char * const record_usage[] = {
847 "perf record [<options>] [<command>]",
848 "perf record [<options>] -- <command> [<options>]",
849 NULL
850};
851
852
853
854
855
856
857
858
859
860
861
862static struct perf_record record = {
863 .opts = {
864 .mmap_pages = UINT_MAX,
865 .user_freq = UINT_MAX,
866 .user_interval = ULLONG_MAX,
867 .freq = 4000,
868 .target = {
869 .uses_mmap = true,
870 },
871 },
872 .write_mode = WRITE_FORCE,
873 .file_new = true,
874};
875
876#define CALLCHAIN_HELP "do call-graph (stack chain/backtrace) recording: "
877
878#ifdef LIBUNWIND_SUPPORT
879const char record_callchain_help[] = CALLCHAIN_HELP "[fp] dwarf";
880#else
881const char record_callchain_help[] = CALLCHAIN_HELP "[fp]";
882#endif
883
884
885
886
887
888
889
890
891const struct option record_options[] = {
892 OPT_CALLBACK('e', "event", &record.evlist, "event",
893 "event selector. use 'perf list' to list available events",
894 parse_events_option),
895 OPT_CALLBACK(0, "filter", &record.evlist, "filter",
896 "event filter", parse_filter),
897 OPT_STRING('p', "pid", &record.opts.target.pid, "pid",
898 "record events on existing process id"),
899 OPT_STRING('t', "tid", &record.opts.target.tid, "tid",
900 "record events on existing thread id"),
901 OPT_INTEGER('r', "realtime", &record.realtime_prio,
902 "collect data with this RT SCHED_FIFO priority"),
903 OPT_BOOLEAN('D', "no-delay", &record.opts.no_delay,
904 "collect data without buffering"),
905 OPT_BOOLEAN('R', "raw-samples", &record.opts.raw_samples,
906 "collect raw sample records from all opened counters"),
907 OPT_BOOLEAN('a', "all-cpus", &record.opts.target.system_wide,
908 "system-wide collection from all CPUs"),
909 OPT_BOOLEAN('A', "append", &record.append_file,
910 "append to the output file to do incremental profiling"),
911 OPT_STRING('C', "cpu", &record.opts.target.cpu_list, "cpu",
912 "list of cpus to monitor"),
913 OPT_BOOLEAN('f', "force", &record.force,
914 "overwrite existing data file (deprecated)"),
915 OPT_U64('c', "count", &record.opts.user_interval, "event period to sample"),
916 OPT_STRING('o', "output", &record.output_name, "file",
917 "output file name"),
918 OPT_BOOLEAN('i', "no-inherit", &record.opts.no_inherit,
919 "child tasks do not inherit counters"),
920 OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
921 OPT_UINTEGER('m', "mmap-pages", &record.opts.mmap_pages,
922 "number of mmap data pages"),
923 OPT_BOOLEAN(0, "group", &record.opts.group,
924 "put the counters into a counter group"),
925 OPT_CALLBACK_DEFAULT('g', "call-graph", &record.opts,
926 "mode[,dump_size]", record_callchain_help,
927 &record_parse_callchain_opt, "fp"),
928 OPT_INCR('v', "verbose", &verbose,
929 "be more verbose (show counter open errors, etc)"),
930 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
931 OPT_BOOLEAN('s', "stat", &record.opts.inherit_stat,
932 "per thread counts"),
933 OPT_BOOLEAN('d', "data", &record.opts.sample_address,
934 "Sample addresses"),
935 OPT_BOOLEAN('T', "timestamp", &record.opts.sample_time, "Sample timestamps"),
936 OPT_BOOLEAN('P', "period", &record.opts.period, "Sample period"),
937 OPT_BOOLEAN('n', "no-samples", &record.opts.no_samples,
938 "don't sample"),
939 OPT_BOOLEAN('N', "no-buildid-cache", &record.no_buildid_cache,
940 "do not update the buildid cache"),
941 OPT_BOOLEAN('B', "no-buildid", &record.no_buildid,
942 "do not collect buildids in perf.data"),
943 OPT_CALLBACK('G', "cgroup", &record.evlist, "name",
944 "monitor event in cgroup name only",
945 parse_cgroups),
946 OPT_STRING('u', "uid", &record.opts.target.uid_str, "user",
947 "user to profile"),
948
949 OPT_CALLBACK_NOOPT('b', "branch-any", &record.opts.branch_stack,
950 "branch any", "sample any taken branches",
951 parse_branch_stack),
952
953 OPT_CALLBACK('j', "branch-filter", &record.opts.branch_stack,
954 "branch filter mask", "branch stack filter modes",
955 parse_branch_stack),
956 OPT_BOOLEAN('W', "weight", &record.opts.sample_weight,
957 "sample by weight (on special events only)"),
958 OPT_END()
959};
960
961int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
962{
963 int err = -ENOMEM;
964 struct perf_evsel *pos;
965 struct perf_evlist *evsel_list;
966 struct perf_record *rec = &record;
967 char errbuf[BUFSIZ];
968
969 evsel_list = perf_evlist__new();
970 if (evsel_list == NULL)
971 return -ENOMEM;
972
973 rec->evlist = evsel_list;
974
975 argc = parse_options(argc, argv, record_options, record_usage,
976 PARSE_OPT_STOP_AT_NON_OPTION);
977 if (!argc && perf_target__none(&rec->opts.target))
978 usage_with_options(record_usage, record_options);
979
980 if (rec->force && rec->append_file) {
981 ui__error("Can't overwrite and append at the same time."
982 " You need to choose between -f and -A");
983 usage_with_options(record_usage, record_options);
984 } else if (rec->append_file) {
985 rec->write_mode = WRITE_APPEND;
986 } else {
987 rec->write_mode = WRITE_FORCE;
988 }
989
990 if (nr_cgroups && !rec->opts.target.system_wide) {
991 ui__error("cgroup monitoring only available in"
992 " system-wide mode\n");
993 usage_with_options(record_usage, record_options);
994 }
995
996 symbol__init();
997
998 if (symbol_conf.kptr_restrict)
999 pr_warning(
1000"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
1001"check /proc/sys/kernel/kptr_restrict.\n\n"
1002"Samples in kernel functions may not be resolved if a suitable vmlinux\n"
1003"file is not found in the buildid cache or in the vmlinux path.\n\n"
1004"Samples in kernel modules won't be resolved at all.\n\n"
1005"If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
1006"even with a suitable vmlinux or kallsyms file.\n\n");
1007
1008 if (rec->no_buildid_cache || rec->no_buildid)
1009 disable_buildid_cache();
1010
1011 if (evsel_list->nr_entries == 0 &&
1012 perf_evlist__add_default(evsel_list) < 0) {
1013 pr_err("Not enough memory for event selector list\n");
1014 goto out_symbol_exit;
1015 }
1016
1017 err = perf_target__validate(&rec->opts.target);
1018 if (err) {
1019 perf_target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1020 ui__warning("%s", errbuf);
1021 }
1022
1023 err = perf_target__parse_uid(&rec->opts.target);
1024 if (err) {
1025 int saved_errno = errno;
1026
1027 perf_target__strerror(&rec->opts.target, err, errbuf, BUFSIZ);
1028 ui__error("%s", errbuf);
1029
1030 err = -saved_errno;
1031 goto out_symbol_exit;
1032 }
1033
1034 err = -ENOMEM;
1035 if (perf_evlist__create_maps(evsel_list, &rec->opts.target) < 0)
1036 usage_with_options(record_usage, record_options);
1037
1038 list_for_each_entry(pos, &evsel_list->entries, node) {
1039 if (perf_header__push_event(pos->attr.config, perf_evsel__name(pos)))
1040 goto out_free_fd;
1041 }
1042
1043 if (rec->opts.user_interval != ULLONG_MAX)
1044 rec->opts.default_interval = rec->opts.user_interval;
1045 if (rec->opts.user_freq != UINT_MAX)
1046 rec->opts.freq = rec->opts.user_freq;
1047
1048
1049
1050
1051 if (rec->opts.default_interval)
1052 rec->opts.freq = 0;
1053 else if (rec->opts.freq) {
1054 rec->opts.default_interval = rec->opts.freq;
1055 } else {
1056 ui__error("frequency and count are zero, aborting\n");
1057 err = -EINVAL;
1058 goto out_free_fd;
1059 }
1060
1061 err = __cmd_record(&record, argc, argv);
1062
1063 perf_evlist__munmap(evsel_list);
1064 perf_evlist__close(evsel_list);
1065out_free_fd:
1066 perf_evlist__delete_maps(evsel_list);
1067out_symbol_exit:
1068 symbol__exit();
1069 return err;
1070}
1071
