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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / tools / perf / builtin-record.c
blob0974f957b8fa2634409ff46e8de915b1380e87a8
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 (no_buildid_cache || no_buildid)
827 disable_buildid_cache();
828
829 if (evsel_list->nr_entries == 0 &&
830 perf_evlist__add_default(evsel_list) < 0) {
831 pr_err("Not enough memory for event selector list\n");
832 goto out_symbol_exit;
833 }
834
835 if (target_pid != -1)
836 target_tid = target_pid;
837
838 if (perf_evlist__create_maps(evsel_list, target_pid,
839 target_tid, cpu_list) < 0)
840 usage_with_options(record_usage, record_options);
841
842 list_for_each_entry(pos, &evsel_list->entries, node) {
843 if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr,
844 evsel_list->threads->nr) < 0)
845 goto out_free_fd;
846 if (perf_header__push_event(pos->attr.config, event_name(pos)))
847 goto out_free_fd;
848 }
849
850 if (perf_evlist__alloc_pollfd(evsel_list) < 0)
851 goto out_free_fd;
852
853 if (user_interval != ULLONG_MAX)
854 default_interval = user_interval;
855 if (user_freq != UINT_MAX)
856 freq = user_freq;
857
858 /*
859 * User specified count overrides default frequency.
860 */
861 if (default_interval)
862 freq = 0;
863 else if (freq) {
864 default_interval = freq;
865 } else {
866 fprintf(stderr, "frequency and count are zero, aborting\n");
867 err = -EINVAL;
868 goto out_free_fd;
869 }
870
871 err = __cmd_record(argc, argv);
872 out_free_fd:
873 perf_evlist__delete_maps(evsel_list);
874 out_symbol_exit:
875 symbol__exit();
876 return err;
877 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree