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[linux-2.6/next.git] / tools / perf / builtin-record.c
blob8e2c85798185c58068783f2b392e00f305f492e1
1 /*
2 * builtin-record.c
3 *
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.
7 */
8 #define _FILE_OFFSET_BITS 64
9
10 #include "builtin.h"
11
12 #include "perf.h"
13
14 #include "util/build-id.h"
15 #include "util/util.h"
16 #include "util/parse-options.h"
17 #include "util/parse-events.h"
18
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/symbol.h"
26 #include "util/cpumap.h"
27 #include "util/thread_map.h"
28
29 #include <unistd.h>
30 #include <sched.h>
31 #include <sys/mman.h>
32
33 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
34
35 enum write_mode_t {
36 WRITE_FORCE,
37 WRITE_APPEND
38 };
39
40 static u64 user_interval = ULLONG_MAX;
41 static u64 default_interval = 0;
42
43 static unsigned int page_size;
44 static unsigned int mmap_pages = UINT_MAX;
45 static unsigned int user_freq = UINT_MAX;
46 static int freq = 1000;
47 static int output;
48 static int pipe_output = 0;
49 static const char *output_name = NULL;
50 static int group = 0;
51 static int realtime_prio = 0;
52 static bool nodelay = false;
53 static bool raw_samples = false;
54 static bool sample_id_all_avail = true;
55 static bool system_wide = false;
56 static pid_t target_pid = -1;
57 static pid_t target_tid = -1;
58 static pid_t child_pid = -1;
59 static bool no_inherit = false;
60 static enum write_mode_t write_mode = WRITE_FORCE;
61 static bool call_graph = false;
62 static bool inherit_stat = false;
63 static bool no_samples = false;
64 static bool sample_address = false;
65 static bool sample_time = false;
66 static bool no_buildid = false;
67 static bool no_buildid_cache = false;
68 static struct perf_evlist *evsel_list;
69
70 static long samples = 0;
71 static u64 bytes_written = 0;
72
73 static int file_new = 1;
74 static off_t post_processing_offset;
75
76 static struct perf_session *session;
77 static const char *cpu_list;
78
79 static void advance_output(size_t size)
80 {
81 bytes_written += size;
82 }
83
84 static void write_output(void *buf, size_t size)
85 {
86 while (size) {
87 int ret = write(output, buf, size);
88
89 if (ret < 0)
90 die("failed to write");
91
92 size -= ret;
93 buf += ret;
94
95 bytes_written += ret;
96 }
97 }
98
99 static int process_synthesized_event(union perf_event *event,
100 struct perf_sample *sample __used,
101 struct perf_session *self __used)
102 {
103 write_output(event, event->header.size);
104 return 0;
105 }
106
107 static void mmap_read(struct perf_mmap *md)
108 {
109 unsigned int head = perf_mmap__read_head(md);
110 unsigned int old = md->prev;
111 unsigned char *data = md->base + page_size;
112 unsigned long size;
113 void *buf;
114
115 if (old == head)
116 return;
117
118 samples++;
119
120 size = head - old;
121
122 if ((old & md->mask) + size != (head & md->mask)) {
123 buf = &data[old & md->mask];
124 size = md->mask + 1 - (old & md->mask);
125 old += size;
126
127 write_output(buf, size);
128 }
129
130 buf = &data[old & md->mask];
131 size = head - old;
132 old += size;
133
134 write_output(buf, size);
135
136 md->prev = old;
137 perf_mmap__write_tail(md, old);
138 }
139
140 static volatile int done = 0;
141 static volatile int signr = -1;
142
143 static void sig_handler(int sig)
144 {
145 done = 1;
146 signr = sig;
147 }
148
149 static void sig_atexit(void)
150 {
151 if (child_pid > 0)
152 kill(child_pid, SIGTERM);
153
154 if (signr == -1 || signr == SIGUSR1)
155 return;
156
157 signal(signr, SIG_DFL);
158 kill(getpid(), signr);
159 }
160
161 static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist)
162 {
163 struct perf_event_attr *attr = &evsel->attr;
164 int track = !evsel->idx; /* only the first counter needs these */
165
166 attr->inherit = !no_inherit;
167 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
168 PERF_FORMAT_TOTAL_TIME_RUNNING |
169 PERF_FORMAT_ID;
170
171 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
172
173 if (evlist->nr_entries > 1)
174 attr->sample_type |= PERF_SAMPLE_ID;
175
176 /*
177 * We default some events to a 1 default interval. But keep
178 * it a weak assumption overridable by the user.
179 */
180 if (!attr->sample_period || (user_freq != UINT_MAX &&
181 user_interval != ULLONG_MAX)) {
182 if (freq) {
183 attr->sample_type |= PERF_SAMPLE_PERIOD;
184 attr->freq = 1;
185 attr->sample_freq = freq;
186 } else {
187 attr->sample_period = default_interval;
188 }
189 }
190
191 if (no_samples)
192 attr->sample_freq = 0;
193
194 if (inherit_stat)
195 attr->inherit_stat = 1;
196
197 if (sample_address) {
198 attr->sample_type |= PERF_SAMPLE_ADDR;
199 attr->mmap_data = track;
200 }
201
202 if (call_graph)
203 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
204
205 if (system_wide)
206 attr->sample_type |= PERF_SAMPLE_CPU;
207
208 if (sample_id_all_avail &&
209 (sample_time || system_wide || !no_inherit || cpu_list))
210 attr->sample_type |= PERF_SAMPLE_TIME;
211
212 if (raw_samples) {
213 attr->sample_type |= PERF_SAMPLE_TIME;
214 attr->sample_type |= PERF_SAMPLE_RAW;
215 attr->sample_type |= PERF_SAMPLE_CPU;
216 }
217
218 if (nodelay) {
219 attr->watermark = 0;
220 attr->wakeup_events = 1;
221 }
222
223 attr->mmap = track;
224 attr->comm = track;
225
226 if (target_pid == -1 && target_tid == -1 && !system_wide) {
227 attr->disabled = 1;
228 attr->enable_on_exec = 1;
229 }
230 }
231
232 static bool perf_evlist__equal(struct perf_evlist *evlist,
233 struct perf_evlist *other)
234 {
235 struct perf_evsel *pos, *pair;
236
237 if (evlist->nr_entries != other->nr_entries)
238 return false;
239
240 pair = list_entry(other->entries.next, struct perf_evsel, node);
241
242 list_for_each_entry(pos, &evlist->entries, node) {
243 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
244 return false;
245 pair = list_entry(pair->node.next, struct perf_evsel, node);
246 }
247
248 return true;
249 }
250
251 static void open_counters(struct perf_evlist *evlist)
252 {
253 struct perf_evsel *pos;
254
255 if (evlist->cpus->map[0] < 0)
256 no_inherit = true;
257
258 list_for_each_entry(pos, &evlist->entries, node) {
259 struct perf_event_attr *attr = &pos->attr;
260 /*
261 * Check if parse_single_tracepoint_event has already asked for
262 * PERF_SAMPLE_TIME.
263 *
264 * XXX this is kludgy but short term fix for problems introduced by
265 * eac23d1c that broke 'perf script' by having different sample_types
266 * when using multiple tracepoint events when we use a perf binary
267 * that tries to use sample_id_all on an older kernel.
268 *
269 * We need to move counter creation to perf_session, support
270 * different sample_types, etc.
271 */
272 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
273
274 config_attr(pos, evlist);
275 retry_sample_id:
276 attr->sample_id_all = sample_id_all_avail ? 1 : 0;
277 try_again:
278 if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group) < 0) {
279 int err = errno;
280
281 if (err == EPERM || err == EACCES) {
282 ui__warning_paranoid();
283 exit(EXIT_FAILURE);
284 } else if (err == ENODEV && cpu_list) {
285 die("No such device - did you specify"
286 " an out-of-range profile CPU?\n");
287 } else if (err == EINVAL && sample_id_all_avail) {
288 /*
289 * Old kernel, no attr->sample_id_type_all field
290 */
291 sample_id_all_avail = false;
292 if (!sample_time && !raw_samples && !time_needed)
293 attr->sample_type &= ~PERF_SAMPLE_TIME;
294
295 goto retry_sample_id;
296 }
297
298 /*
299 * If it's cycles then fall back to hrtimer
300 * based cpu-clock-tick sw counter, which
301 * is always available even if no PMU support:
302 */
303 if (attr->type == PERF_TYPE_HARDWARE
304 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
305
306 if (verbose)
307 ui__warning("The cycles event is not supported, "
308 "trying to fall back to cpu-clock-ticks\n");
309 attr->type = PERF_TYPE_SOFTWARE;
310 attr->config = PERF_COUNT_SW_CPU_CLOCK;
311 goto try_again;
312 }
313
314 if (err == ENOENT) {
315 ui__warning("The %s event is not supported.\n",
316 event_name(pos));
317 exit(EXIT_FAILURE);
318 }
319
320 printf("\n");
321 error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
322 err, strerror(err));
323
324 #if defined(__i386__) || defined(__x86_64__)
325 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
326 die("No hardware sampling interrupt available."
327 " No APIC? If so then you can boot the kernel"
328 " with the \"lapic\" boot parameter to"
329 " force-enable it.\n");
330 #endif
331
332 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
333 }
334 }
335
336 if (perf_evlist__set_filters(evlist)) {
337 error("failed to set filter with %d (%s)\n", errno,
338 strerror(errno));
339 exit(-1);
340 }
341
342 if (perf_evlist__mmap(evlist, mmap_pages, false) < 0)
343 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
344
345 if (file_new)
346 session->evlist = evlist;
347 else {
348 if (!perf_evlist__equal(session->evlist, evlist)) {
349 fprintf(stderr, "incompatible append\n");
350 exit(-1);
351 }
352 }
353
354 perf_session__update_sample_type(session);
355 }
356
357 static int process_buildids(void)
358 {
359 u64 size = lseek(output, 0, SEEK_CUR);
360
361 if (size == 0)
362 return 0;
363
364 session->fd = output;
365 return __perf_session__process_events(session, post_processing_offset,
366 size - post_processing_offset,
367 size, &build_id__mark_dso_hit_ops);
368 }
369
370 static void atexit_header(void)
371 {
372 if (!pipe_output) {
373 session->header.data_size += bytes_written;
374
375 if (!no_buildid)
376 process_buildids();
377 perf_session__write_header(session, evsel_list, output, true);
378 perf_session__delete(session);
379 perf_evlist__delete(evsel_list);
380 symbol__exit();
381 }
382 }
383
384 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
385 {
386 int err;
387 struct perf_session *psession = data;
388
389 if (machine__is_host(machine))
390 return;
391
392 /*
393 *As for guest kernel when processing subcommand record&report,
394 *we arrange module mmap prior to guest kernel mmap and trigger
395 *a preload dso because default guest module symbols are loaded
396 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
397 *method is used to avoid symbol missing when the first addr is
398 *in module instead of in guest kernel.
399 */
400 err = perf_event__synthesize_modules(process_synthesized_event,
401 psession, machine);
402 if (err < 0)
403 pr_err("Couldn't record guest kernel [%d]'s reference"
404 " relocation symbol.\n", machine->pid);
405
406 /*
407 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
408 * have no _text sometimes.
409 */
410 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
411 psession, machine, "_text");
412 if (err < 0)
413 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
414 psession, machine,
415 "_stext");
416 if (err < 0)
417 pr_err("Couldn't record guest kernel [%d]'s reference"
418 " relocation symbol.\n", machine->pid);
419 }
420
421 static struct perf_event_header finished_round_event = {
422 .size = sizeof(struct perf_event_header),
423 .type = PERF_RECORD_FINISHED_ROUND,
424 };
425
426 static void mmap_read_all(void)
427 {
428 int i;
429
430 for (i = 0; i < evsel_list->nr_mmaps; i++) {
431 if (evsel_list->mmap[i].base)
432 mmap_read(&evsel_list->mmap[i]);
433 }
434
435 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
436 write_output(&finished_round_event, sizeof(finished_round_event));
437 }
438
439 static int __cmd_record(int argc, const char **argv)
440 {
441 int i;
442 struct stat st;
443 int flags;
444 int err;
445 unsigned long waking = 0;
446 int child_ready_pipe[2], go_pipe[2];
447 const bool forks = argc > 0;
448 char buf;
449 struct machine *machine;
450
451 page_size = sysconf(_SC_PAGE_SIZE);
452
453 atexit(sig_atexit);
454 signal(SIGCHLD, sig_handler);
455 signal(SIGINT, sig_handler);
456 signal(SIGUSR1, sig_handler);
457
458 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
459 perror("failed to create pipes");
460 exit(-1);
461 }
462
463 if (!output_name) {
464 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
465 pipe_output = 1;
466 else
467 output_name = "perf.data";
468 }
469 if (output_name) {
470 if (!strcmp(output_name, "-"))
471 pipe_output = 1;
472 else if (!stat(output_name, &st) && st.st_size) {
473 if (write_mode == WRITE_FORCE) {
474 char oldname[PATH_MAX];
475 snprintf(oldname, sizeof(oldname), "%s.old",
476 output_name);
477 unlink(oldname);
478 rename(output_name, oldname);
479 }
480 } else if (write_mode == WRITE_APPEND) {
481 write_mode = WRITE_FORCE;
482 }
483 }
484
485 flags = O_CREAT|O_RDWR;
486 if (write_mode == WRITE_APPEND)
487 file_new = 0;
488 else
489 flags |= O_TRUNC;
490
491 if (pipe_output)
492 output = STDOUT_FILENO;
493 else
494 output = open(output_name, flags, S_IRUSR | S_IWUSR);
495 if (output < 0) {
496 perror("failed to create output file");
497 exit(-1);
498 }
499
500 session = perf_session__new(output_name, O_WRONLY,
501 write_mode == WRITE_FORCE, false, NULL);
502 if (session == NULL) {
503 pr_err("Not enough memory for reading perf file header\n");
504 return -1;
505 }
506
507 if (!no_buildid)
508 perf_header__set_feat(&session->header, HEADER_BUILD_ID);
509
510 if (!file_new) {
511 err = perf_session__read_header(session, output);
512 if (err < 0)
513 goto out_delete_session;
514 }
515
516 if (have_tracepoints(&evsel_list->entries))
517 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
518
519 /* 512 kiB: default amount of unprivileged mlocked memory */
520 if (mmap_pages == UINT_MAX)
521 mmap_pages = (512 * 1024) / page_size;
522
523 if (forks) {
524 child_pid = fork();
525 if (child_pid < 0) {
526 perror("failed to fork");
527 exit(-1);
528 }
529
530 if (!child_pid) {
531 if (pipe_output)
532 dup2(2, 1);
533 close(child_ready_pipe[0]);
534 close(go_pipe[1]);
535 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
536
537 /*
538 * Do a dummy execvp to get the PLT entry resolved,
539 * so we avoid the resolver overhead on the real
540 * execvp call.
541 */
542 execvp("", (char **)argv);
543
544 /*
545 * Tell the parent we're ready to go
546 */
547 close(child_ready_pipe[1]);
548
549 /*
550 * Wait until the parent tells us to go.
551 */
552 if (read(go_pipe[0], &buf, 1) == -1)
553 perror("unable to read pipe");
554
555 execvp(argv[0], (char **)argv);
556
557 perror(argv[0]);
558 kill(getppid(), SIGUSR1);
559 exit(-1);
560 }
561
562 if (!system_wide && target_tid == -1 && target_pid == -1)
563 evsel_list->threads->map[0] = child_pid;
564
565 close(child_ready_pipe[1]);
566 close(go_pipe[0]);
567 /*
568 * wait for child to settle
569 */
570 if (read(child_ready_pipe[0], &buf, 1) == -1) {
571 perror("unable to read pipe");
572 exit(-1);
573 }
574 close(child_ready_pipe[0]);
575 }
576
577 open_counters(evsel_list);
578
579 /*
580 * perf_session__delete(session) will be called at atexit_header()
581 */
582 atexit(atexit_header);
583
584 if (pipe_output) {
585 err = perf_header__write_pipe(output);
586 if (err < 0)
587 return err;
588 } else if (file_new) {
589 err = perf_session__write_header(session, evsel_list,
590 output, false);
591 if (err < 0)
592 return err;
593 }
594
595 post_processing_offset = lseek(output, 0, SEEK_CUR);
596
597 if (pipe_output) {
598 err = perf_session__synthesize_attrs(session,
599 process_synthesized_event);
600 if (err < 0) {
601 pr_err("Couldn't synthesize attrs.\n");
602 return err;
603 }
604
605 err = perf_event__synthesize_event_types(process_synthesized_event,
606 session);
607 if (err < 0) {
608 pr_err("Couldn't synthesize event_types.\n");
609 return err;
610 }
611
612 if (have_tracepoints(&evsel_list->entries)) {
613 /*
614 * FIXME err <= 0 here actually means that
615 * there were no tracepoints so its not really
616 * an error, just that we don't need to
617 * synthesize anything. We really have to
618 * return this more properly and also
619 * propagate errors that now are calling die()
620 */
621 err = perf_event__synthesize_tracing_data(output, evsel_list,
622 process_synthesized_event,
623 session);
624 if (err <= 0) {
625 pr_err("Couldn't record tracing data.\n");
626 return err;
627 }
628 advance_output(err);
629 }
630 }
631
632 machine = perf_session__find_host_machine(session);
633 if (!machine) {
634 pr_err("Couldn't find native kernel information.\n");
635 return -1;
636 }
637
638 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
639 session, machine, "_text");
640 if (err < 0)
641 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
642 session, machine, "_stext");
643 if (err < 0)
644 pr_err("Couldn't record kernel reference relocation symbol\n"
645 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
646 "Check /proc/kallsyms permission or run as root.\n");
647
648 err = perf_event__synthesize_modules(process_synthesized_event,
649 session, machine);
650 if (err < 0)
651 pr_err("Couldn't record kernel module information.\n"
652 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
653 "Check /proc/modules permission or run as root.\n");
654
655 if (perf_guest)
656 perf_session__process_machines(session,
657 perf_event__synthesize_guest_os);
658
659 if (!system_wide)
660 perf_event__synthesize_thread_map(evsel_list->threads,
661 process_synthesized_event,
662 session);
663 else
664 perf_event__synthesize_threads(process_synthesized_event,
665 session);
666
667 if (realtime_prio) {
668 struct sched_param param;
669
670 param.sched_priority = realtime_prio;
671 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
672 pr_err("Could not set realtime priority.\n");
673 exit(-1);
674 }
675 }
676
677 /*
678 * Let the child rip
679 */
680 if (forks)
681 close(go_pipe[1]);
682
683 for (;;) {
684 int hits = samples;
685 int thread;
686
687 mmap_read_all();
688
689 if (hits == samples) {
690 if (done)
691 break;
692 err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
693 waking++;
694 }
695
696 if (done) {
697 for (i = 0; i < evsel_list->cpus->nr; i++) {
698 struct perf_evsel *pos;
699
700 list_for_each_entry(pos, &evsel_list->entries, node) {
701 for (thread = 0;
702 thread < evsel_list->threads->nr;
703 thread++)
704 ioctl(FD(pos, i, thread),
705 PERF_EVENT_IOC_DISABLE);
706 }
707 }
708 }
709 }
710
711 if (quiet || signr == SIGUSR1)
712 return 0;
713
714 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
715
716 /*
717 * Approximate RIP event size: 24 bytes.
718 */
719 fprintf(stderr,
720 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
721 (double)bytes_written / 1024.0 / 1024.0,
722 output_name,
723 bytes_written / 24);
724
725 return 0;
726
727 out_delete_session:
728 perf_session__delete(session);
729 return err;
730 }
731
732 static const char * const record_usage[] = {
733 "perf record [<options>] [<command>]",
734 "perf record [<options>] -- <command> [<options>]",
735 NULL
736 };
737
738 static bool force, append_file;
739
740 const struct option record_options[] = {
741 OPT_CALLBACK('e', "event", &evsel_list, "event",
742 "event selector. use 'perf list' to list available events",
743 parse_events),
744 OPT_CALLBACK(0, "filter", &evsel_list, "filter",
745 "event filter", parse_filter),
746 OPT_INTEGER('p', "pid", &target_pid,
747 "record events on existing process id"),
748 OPT_INTEGER('t', "tid", &target_tid,
749 "record events on existing thread id"),
750 OPT_INTEGER('r', "realtime", &realtime_prio,
751 "collect data with this RT SCHED_FIFO priority"),
752 OPT_BOOLEAN('D', "no-delay", &nodelay,
753 "collect data without buffering"),
754 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
755 "collect raw sample records from all opened counters"),
756 OPT_BOOLEAN('a', "all-cpus", &system_wide,
757 "system-wide collection from all CPUs"),
758 OPT_BOOLEAN('A', "append", &append_file,
759 "append to the output file to do incremental profiling"),
760 OPT_STRING('C', "cpu", &cpu_list, "cpu",
761 "list of cpus to monitor"),
762 OPT_BOOLEAN('f', "force", &force,
763 "overwrite existing data file (deprecated)"),
764 OPT_U64('c', "count", &user_interval, "event period to sample"),
765 OPT_STRING('o', "output", &output_name, "file",
766 "output file name"),
767 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
768 "child tasks do not inherit counters"),
769 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
770 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
771 OPT_BOOLEAN('g', "call-graph", &call_graph,
772 "do call-graph (stack chain/backtrace) recording"),
773 OPT_INCR('v', "verbose", &verbose,
774 "be more verbose (show counter open errors, etc)"),
775 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
776 OPT_BOOLEAN('s', "stat", &inherit_stat,
777 "per thread counts"),
778 OPT_BOOLEAN('d', "data", &sample_address,
779 "Sample addresses"),
780 OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"),
781 OPT_BOOLEAN('n', "no-samples", &no_samples,
782 "don't sample"),
783 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
784 "do not update the buildid cache"),
785 OPT_BOOLEAN('B', "no-buildid", &no_buildid,
786 "do not collect buildids in perf.data"),
787 OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
788 "monitor event in cgroup name only",
789 parse_cgroups),
790 OPT_END()
791 };
792
793 int cmd_record(int argc, const char **argv, const char *prefix __used)
794 {
795 int err = -ENOMEM;
796 struct perf_evsel *pos;
797
798 evsel_list = perf_evlist__new(NULL, NULL);
799 if (evsel_list == NULL)
800 return -ENOMEM;
801
802 argc = parse_options(argc, argv, record_options, record_usage,
803 PARSE_OPT_STOP_AT_NON_OPTION);
804 if (!argc && target_pid == -1 && target_tid == -1 &&
805 !system_wide && !cpu_list)
806 usage_with_options(record_usage, record_options);
807
808 if (force && append_file) {
809 fprintf(stderr, "Can't overwrite and append at the same time."
810 " You need to choose between -f and -A");
811 usage_with_options(record_usage, record_options);
812 } else if (append_file) {
813 write_mode = WRITE_APPEND;
814 } else {
815 write_mode = WRITE_FORCE;
816 }
817
818 if (nr_cgroups && !system_wide) {
819 fprintf(stderr, "cgroup monitoring only available in"
820 " system-wide mode\n");
821 usage_with_options(record_usage, record_options);
822 }
823
824 symbol__init();
825
826 if (symbol_conf.kptr_restrict)
827 pr_warning(
828 "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
829 "check /proc/sys/kernel/kptr_restrict.\n\n"
830 "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
831 "file is not found in the buildid cache or in the vmlinux path.\n\n"
832 "Samples in kernel modules won't be resolved at all.\n\n"
833 "If some relocation was applied (e.g. kexec) symbols may be misresolved\n"
834 "even with a suitable vmlinux or kallsyms file.\n\n");
835
836 if (no_buildid_cache || no_buildid)
837 disable_buildid_cache();
838
839 if (evsel_list->nr_entries == 0 &&
840 perf_evlist__add_default(evsel_list) < 0) {
841 pr_err("Not enough memory for event selector list\n");
842 goto out_symbol_exit;
843 }
844
845 if (target_pid != -1)
846 target_tid = target_pid;
847
848 if (perf_evlist__create_maps(evsel_list, target_pid,
849 target_tid, cpu_list) < 0)
850 usage_with_options(record_usage, record_options);
851
852 list_for_each_entry(pos, &evsel_list->entries, node) {
853 if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr,
854 evsel_list->threads->nr) < 0)
855 goto out_free_fd;
856 if (perf_header__push_event(pos->attr.config, event_name(pos)))
857 goto out_free_fd;
858 }
859
860 if (perf_evlist__alloc_pollfd(evsel_list) < 0)
861 goto out_free_fd;
862
863 if (user_interval != ULLONG_MAX)
864 default_interval = user_interval;
865 if (user_freq != UINT_MAX)
866 freq = user_freq;
867
868 /*
869 * User specified count overrides default frequency.
870 */
871 if (default_interval)
872 freq = 0;
873 else if (freq) {
874 default_interval = freq;
875 } else {
876 fprintf(stderr, "frequency and count are zero, aborting\n");
877 err = -EINVAL;
878 goto out_free_fd;
879 }
880
881 err = __cmd_record(argc, argv);
882 out_free_fd:
883 perf_evlist__delete_maps(evsel_list);
884 out_symbol_exit:
885 symbol__exit();
886 return err;
887 }
linux-next