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dm table: reject devices without request fns
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / tools / perf / builtin-record.c
blob60cac6f92e8b8d17bf165a6a592c6653f6141a96
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/evsel.h"
22 #include "util/debug.h"
23 #include "util/session.h"
24 #include "util/symbol.h"
25 #include "util/cpumap.h"
26
27 #include <unistd.h>
28 #include <sched.h>
29 #include <sys/mman.h>
30
31 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
32
33 enum write_mode_t {
34 WRITE_FORCE,
35 WRITE_APPEND
36 };
37
38 static u64 user_interval = ULLONG_MAX;
39 static u64 default_interval = 0;
40 static u64 sample_type;
41
42 static struct cpu_map *cpus;
43 static unsigned int page_size;
44 static unsigned int mmap_pages = 128;
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 = "perf.data";
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 struct thread_map *threads;
59 static pid_t child_pid = -1;
60 static bool no_inherit = false;
61 static enum write_mode_t write_mode = WRITE_FORCE;
62 static bool call_graph = false;
63 static bool inherit_stat = false;
64 static bool no_samples = false;
65 static bool sample_address = false;
66 static bool sample_time = false;
67 static bool no_buildid = false;
68 static bool no_buildid_cache = false;
69
70 static long samples = 0;
71 static u64 bytes_written = 0;
72
73 static struct pollfd *event_array;
74
75 static int nr_poll = 0;
76 static int nr_cpu = 0;
77
78 static int file_new = 1;
79 static off_t post_processing_offset;
80
81 static struct perf_session *session;
82 static const char *cpu_list;
83
84 struct mmap_data {
85 void *base;
86 unsigned int mask;
87 unsigned int prev;
88 };
89
90 static struct mmap_data mmap_array[MAX_NR_CPUS];
91
92 static unsigned long mmap_read_head(struct mmap_data *md)
93 {
94 struct perf_event_mmap_page *pc = md->base;
95 long head;
96
97 head = pc->data_head;
98 rmb();
99
100 return head;
101 }
102
103 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
104 {
105 struct perf_event_mmap_page *pc = md->base;
106
107 /*
108 * ensure all reads are done before we write the tail out.
109 */
110 /* mb(); */
111 pc->data_tail = tail;
112 }
113
114 static void advance_output(size_t size)
115 {
116 bytes_written += size;
117 }
118
119 static void write_output(void *buf, size_t size)
120 {
121 while (size) {
122 int ret = write(output, buf, size);
123
124 if (ret < 0)
125 die("failed to write");
126
127 size -= ret;
128 buf += ret;
129
130 bytes_written += ret;
131 }
132 }
133
134 static int process_synthesized_event(event_t *event,
135 struct sample_data *sample __used,
136 struct perf_session *self __used)
137 {
138 write_output(event, event->header.size);
139 return 0;
140 }
141
142 static void mmap_read(struct mmap_data *md)
143 {
144 unsigned int head = mmap_read_head(md);
145 unsigned int old = md->prev;
146 unsigned char *data = md->base + page_size;
147 unsigned long size;
148 void *buf;
149 int diff;
150
151 /*
152 * If we're further behind than half the buffer, there's a chance
153 * the writer will bite our tail and mess up the samples under us.
154 *
155 * If we somehow ended up ahead of the head, we got messed up.
156 *
157 * In either case, truncate and restart at head.
158 */
159 diff = head - old;
160 if (diff < 0) {
161 fprintf(stderr, "WARNING: failed to keep up with mmap data\n");
162 /*
163 * head points to a known good entry, start there.
164 */
165 old = head;
166 }
167
168 if (old != head)
169 samples++;
170
171 size = head - old;
172
173 if ((old & md->mask) + size != (head & md->mask)) {
174 buf = &data[old & md->mask];
175 size = md->mask + 1 - (old & md->mask);
176 old += size;
177
178 write_output(buf, size);
179 }
180
181 buf = &data[old & md->mask];
182 size = head - old;
183 old += size;
184
185 write_output(buf, size);
186
187 md->prev = old;
188 mmap_write_tail(md, old);
189 }
190
191 static volatile int done = 0;
192 static volatile int signr = -1;
193
194 static void sig_handler(int sig)
195 {
196 done = 1;
197 signr = sig;
198 }
199
200 static void sig_atexit(void)
201 {
202 if (child_pid > 0)
203 kill(child_pid, SIGTERM);
204
205 if (signr == -1 || signr == SIGUSR1)
206 return;
207
208 signal(signr, SIG_DFL);
209 kill(getpid(), signr);
210 }
211
212 static int group_fd;
213
214 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
215 {
216 struct perf_header_attr *h_attr;
217
218 if (nr < session->header.attrs) {
219 h_attr = session->header.attr[nr];
220 } else {
221 h_attr = perf_header_attr__new(a);
222 if (h_attr != NULL)
223 if (perf_header__add_attr(&session->header, h_attr) < 0) {
224 perf_header_attr__delete(h_attr);
225 h_attr = NULL;
226 }
227 }
228
229 return h_attr;
230 }
231
232 static void create_counter(struct perf_evsel *evsel, int cpu)
233 {
234 char *filter = evsel->filter;
235 struct perf_event_attr *attr = &evsel->attr;
236 struct perf_header_attr *h_attr;
237 int track = !evsel->idx; /* only the first counter needs these */
238 int thread_index;
239 int ret;
240 struct {
241 u64 count;
242 u64 time_enabled;
243 u64 time_running;
244 u64 id;
245 } read_data;
246 /*
247 * Check if parse_single_tracepoint_event has already asked for
248 * PERF_SAMPLE_TIME.
249 *
250 * XXX this is kludgy but short term fix for problems introduced by
251 * eac23d1c that broke 'perf script' by having different sample_types
252 * when using multiple tracepoint events when we use a perf binary
253 * that tries to use sample_id_all on an older kernel.
254 *
255 * We need to move counter creation to perf_session, support
256 * different sample_types, etc.
257 */
258 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
259
260 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
261 PERF_FORMAT_TOTAL_TIME_RUNNING |
262 PERF_FORMAT_ID;
263
264 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
265
266 if (nr_counters > 1)
267 attr->sample_type |= PERF_SAMPLE_ID;
268
269 /*
270 * We default some events to a 1 default interval. But keep
271 * it a weak assumption overridable by the user.
272 */
273 if (!attr->sample_period || (user_freq != UINT_MAX &&
274 user_interval != ULLONG_MAX)) {
275 if (freq) {
276 attr->sample_type |= PERF_SAMPLE_PERIOD;
277 attr->freq = 1;
278 attr->sample_freq = freq;
279 } else {
280 attr->sample_period = default_interval;
281 }
282 }
283
284 if (no_samples)
285 attr->sample_freq = 0;
286
287 if (inherit_stat)
288 attr->inherit_stat = 1;
289
290 if (sample_address) {
291 attr->sample_type |= PERF_SAMPLE_ADDR;
292 attr->mmap_data = track;
293 }
294
295 if (call_graph)
296 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
297
298 if (system_wide)
299 attr->sample_type |= PERF_SAMPLE_CPU;
300
301 if (sample_id_all_avail &&
302 (sample_time || system_wide || !no_inherit || cpu_list))
303 attr->sample_type |= PERF_SAMPLE_TIME;
304
305 if (raw_samples) {
306 attr->sample_type |= PERF_SAMPLE_TIME;
307 attr->sample_type |= PERF_SAMPLE_RAW;
308 attr->sample_type |= PERF_SAMPLE_CPU;
309 }
310
311 if (nodelay) {
312 attr->watermark = 0;
313 attr->wakeup_events = 1;
314 }
315
316 attr->mmap = track;
317 attr->comm = track;
318 attr->inherit = !no_inherit;
319 if (target_pid == -1 && target_tid == -1 && !system_wide) {
320 attr->disabled = 1;
321 attr->enable_on_exec = 1;
322 }
323 retry_sample_id:
324 attr->sample_id_all = sample_id_all_avail ? 1 : 0;
325
326 for (thread_index = 0; thread_index < threads->nr; thread_index++) {
327 try_again:
328 FD(evsel, nr_cpu, thread_index) = sys_perf_event_open(attr, threads->map[thread_index], cpu, group_fd, 0);
329
330 if (FD(evsel, nr_cpu, thread_index) < 0) {
331 int err = errno;
332
333 if (err == EPERM || err == EACCES)
334 die("Permission error - are you root?\n"
335 "\t Consider tweaking"
336 " /proc/sys/kernel/perf_event_paranoid.\n");
337 else if (err == ENODEV && cpu_list) {
338 die("No such device - did you specify"
339 " an out-of-range profile CPU?\n");
340 } else if (err == EINVAL && sample_id_all_avail) {
341 /*
342 * Old kernel, no attr->sample_id_type_all field
343 */
344 sample_id_all_avail = false;
345 if (!sample_time && !raw_samples && !time_needed)
346 attr->sample_type &= ~PERF_SAMPLE_TIME;
347
348 goto retry_sample_id;
349 }
350
351 /*
352 * If it's cycles then fall back to hrtimer
353 * based cpu-clock-tick sw counter, which
354 * is always available even if no PMU support:
355 */
356 if (attr->type == PERF_TYPE_HARDWARE
357 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
358
359 if (verbose)
360 warning(" ... trying to fall back to cpu-clock-ticks\n");
361 attr->type = PERF_TYPE_SOFTWARE;
362 attr->config = PERF_COUNT_SW_CPU_CLOCK;
363 goto try_again;
364 }
365 printf("\n");
366 error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n",
367 FD(evsel, nr_cpu, thread_index), strerror(err));
368
369 #if defined(__i386__) || defined(__x86_64__)
370 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
371 die("No hardware sampling interrupt available."
372 " No APIC? If so then you can boot the kernel"
373 " with the \"lapic\" boot parameter to"
374 " force-enable it.\n");
375 #endif
376
377 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
378 exit(-1);
379 }
380
381 h_attr = get_header_attr(attr, evsel->idx);
382 if (h_attr == NULL)
383 die("nomem\n");
384
385 if (!file_new) {
386 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
387 fprintf(stderr, "incompatible append\n");
388 exit(-1);
389 }
390 }
391
392 if (read(FD(evsel, nr_cpu, thread_index), &read_data, sizeof(read_data)) == -1) {
393 perror("Unable to read perf file descriptor");
394 exit(-1);
395 }
396
397 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
398 pr_warning("Not enough memory to add id\n");
399 exit(-1);
400 }
401
402 assert(FD(evsel, nr_cpu, thread_index) >= 0);
403 fcntl(FD(evsel, nr_cpu, thread_index), F_SETFL, O_NONBLOCK);
404
405 /*
406 * First counter acts as the group leader:
407 */
408 if (group && group_fd == -1)
409 group_fd = FD(evsel, nr_cpu, thread_index);
410
411 if (evsel->idx || thread_index) {
412 struct perf_evsel *first;
413 first = list_entry(evsel_list.next, struct perf_evsel, node);
414 ret = ioctl(FD(evsel, nr_cpu, thread_index),
415 PERF_EVENT_IOC_SET_OUTPUT,
416 FD(first, nr_cpu, 0));
417 if (ret) {
418 error("failed to set output: %d (%s)\n", errno,
419 strerror(errno));
420 exit(-1);
421 }
422 } else {
423 mmap_array[nr_cpu].prev = 0;
424 mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
425 mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
426 PROT_READ | PROT_WRITE, MAP_SHARED, FD(evsel, nr_cpu, thread_index), 0);
427 if (mmap_array[nr_cpu].base == MAP_FAILED) {
428 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
429 exit(-1);
430 }
431
432 event_array[nr_poll].fd = FD(evsel, nr_cpu, thread_index);
433 event_array[nr_poll].events = POLLIN;
434 nr_poll++;
435 }
436
437 if (filter != NULL) {
438 ret = ioctl(FD(evsel, nr_cpu, thread_index),
439 PERF_EVENT_IOC_SET_FILTER, filter);
440 if (ret) {
441 error("failed to set filter with %d (%s)\n", errno,
442 strerror(errno));
443 exit(-1);
444 }
445 }
446 }
447
448 if (!sample_type)
449 sample_type = attr->sample_type;
450 }
451
452 static void open_counters(int cpu)
453 {
454 struct perf_evsel *pos;
455
456 group_fd = -1;
457
458 list_for_each_entry(pos, &evsel_list, node)
459 create_counter(pos, cpu);
460
461 nr_cpu++;
462 }
463
464 static int process_buildids(void)
465 {
466 u64 size = lseek(output, 0, SEEK_CUR);
467
468 if (size == 0)
469 return 0;
470
471 session->fd = output;
472 return __perf_session__process_events(session, post_processing_offset,
473 size - post_processing_offset,
474 size, &build_id__mark_dso_hit_ops);
475 }
476
477 static void atexit_header(void)
478 {
479 if (!pipe_output) {
480 session->header.data_size += bytes_written;
481
482 if (!no_buildid)
483 process_buildids();
484 perf_header__write(&session->header, output, true);
485 perf_session__delete(session);
486 perf_evsel_list__delete();
487 symbol__exit();
488 }
489 }
490
491 static void event__synthesize_guest_os(struct machine *machine, void *data)
492 {
493 int err;
494 struct perf_session *psession = data;
495
496 if (machine__is_host(machine))
497 return;
498
499 /*
500 *As for guest kernel when processing subcommand record&report,
501 *we arrange module mmap prior to guest kernel mmap and trigger
502 *a preload dso because default guest module symbols are loaded
503 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
504 *method is used to avoid symbol missing when the first addr is
505 *in module instead of in guest kernel.
506 */
507 err = event__synthesize_modules(process_synthesized_event,
508 psession, machine);
509 if (err < 0)
510 pr_err("Couldn't record guest kernel [%d]'s reference"
511 " relocation symbol.\n", machine->pid);
512
513 /*
514 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
515 * have no _text sometimes.
516 */
517 err = event__synthesize_kernel_mmap(process_synthesized_event,
518 psession, machine, "_text");
519 if (err < 0)
520 err = event__synthesize_kernel_mmap(process_synthesized_event,
521 psession, machine, "_stext");
522 if (err < 0)
523 pr_err("Couldn't record guest kernel [%d]'s reference"
524 " relocation symbol.\n", machine->pid);
525 }
526
527 static struct perf_event_header finished_round_event = {
528 .size = sizeof(struct perf_event_header),
529 .type = PERF_RECORD_FINISHED_ROUND,
530 };
531
532 static void mmap_read_all(void)
533 {
534 int i;
535
536 for (i = 0; i < nr_cpu; i++) {
537 if (mmap_array[i].base)
538 mmap_read(&mmap_array[i]);
539 }
540
541 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
542 write_output(&finished_round_event, sizeof(finished_round_event));
543 }
544
545 static int __cmd_record(int argc, const char **argv)
546 {
547 int i;
548 struct stat st;
549 int flags;
550 int err;
551 unsigned long waking = 0;
552 int child_ready_pipe[2], go_pipe[2];
553 const bool forks = argc > 0;
554 char buf;
555 struct machine *machine;
556
557 page_size = sysconf(_SC_PAGE_SIZE);
558
559 atexit(sig_atexit);
560 signal(SIGCHLD, sig_handler);
561 signal(SIGINT, sig_handler);
562 signal(SIGUSR1, sig_handler);
563
564 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
565 perror("failed to create pipes");
566 exit(-1);
567 }
568
569 if (!strcmp(output_name, "-"))
570 pipe_output = 1;
571 else if (!stat(output_name, &st) && st.st_size) {
572 if (write_mode == WRITE_FORCE) {
573 char oldname[PATH_MAX];
574 snprintf(oldname, sizeof(oldname), "%s.old",
575 output_name);
576 unlink(oldname);
577 rename(output_name, oldname);
578 }
579 } else if (write_mode == WRITE_APPEND) {
580 write_mode = WRITE_FORCE;
581 }
582
583 flags = O_CREAT|O_RDWR;
584 if (write_mode == WRITE_APPEND)
585 file_new = 0;
586 else
587 flags |= O_TRUNC;
588
589 if (pipe_output)
590 output = STDOUT_FILENO;
591 else
592 output = open(output_name, flags, S_IRUSR | S_IWUSR);
593 if (output < 0) {
594 perror("failed to create output file");
595 exit(-1);
596 }
597
598 session = perf_session__new(output_name, O_WRONLY,
599 write_mode == WRITE_FORCE, false, NULL);
600 if (session == NULL) {
601 pr_err("Not enough memory for reading perf file header\n");
602 return -1;
603 }
604
605 if (!no_buildid)
606 perf_header__set_feat(&session->header, HEADER_BUILD_ID);
607
608 if (!file_new) {
609 err = perf_header__read(session, output);
610 if (err < 0)
611 goto out_delete_session;
612 }
613
614 if (have_tracepoints(&evsel_list))
615 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
616
617 /*
618 * perf_session__delete(session) will be called at atexit_header()
619 */
620 atexit(atexit_header);
621
622 if (forks) {
623 child_pid = fork();
624 if (child_pid < 0) {
625 perror("failed to fork");
626 exit(-1);
627 }
628
629 if (!child_pid) {
630 if (pipe_output)
631 dup2(2, 1);
632 close(child_ready_pipe[0]);
633 close(go_pipe[1]);
634 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
635
636 /*
637 * Do a dummy execvp to get the PLT entry resolved,
638 * so we avoid the resolver overhead on the real
639 * execvp call.
640 */
641 execvp("", (char **)argv);
642
643 /*
644 * Tell the parent we're ready to go
645 */
646 close(child_ready_pipe[1]);
647
648 /*
649 * Wait until the parent tells us to go.
650 */
651 if (read(go_pipe[0], &buf, 1) == -1)
652 perror("unable to read pipe");
653
654 execvp(argv[0], (char **)argv);
655
656 perror(argv[0]);
657 kill(getppid(), SIGUSR1);
658 exit(-1);
659 }
660
661 if (!system_wide && target_tid == -1 && target_pid == -1)
662 threads->map[0] = child_pid;
663
664 close(child_ready_pipe[1]);
665 close(go_pipe[0]);
666 /*
667 * wait for child to settle
668 */
669 if (read(child_ready_pipe[0], &buf, 1) == -1) {
670 perror("unable to read pipe");
671 exit(-1);
672 }
673 close(child_ready_pipe[0]);
674 }
675
676 if (!system_wide && no_inherit && !cpu_list) {
677 open_counters(-1);
678 } else {
679 for (i = 0; i < cpus->nr; i++)
680 open_counters(cpus->map[i]);
681 }
682
683 perf_session__set_sample_type(session, sample_type);
684
685 if (pipe_output) {
686 err = perf_header__write_pipe(output);
687 if (err < 0)
688 return err;
689 } else if (file_new) {
690 err = perf_header__write(&session->header, output, false);
691 if (err < 0)
692 return err;
693 }
694
695 post_processing_offset = lseek(output, 0, SEEK_CUR);
696
697 perf_session__set_sample_id_all(session, sample_id_all_avail);
698
699 if (pipe_output) {
700 err = event__synthesize_attrs(&session->header,
701 process_synthesized_event,
702 session);
703 if (err < 0) {
704 pr_err("Couldn't synthesize attrs.\n");
705 return err;
706 }
707
708 err = event__synthesize_event_types(process_synthesized_event,
709 session);
710 if (err < 0) {
711 pr_err("Couldn't synthesize event_types.\n");
712 return err;
713 }
714
715 if (have_tracepoints(&evsel_list)) {
716 /*
717 * FIXME err <= 0 here actually means that
718 * there were no tracepoints so its not really
719 * an error, just that we don't need to
720 * synthesize anything. We really have to
721 * return this more properly and also
722 * propagate errors that now are calling die()
723 */
724 err = event__synthesize_tracing_data(output, &evsel_list,
725 process_synthesized_event,
726 session);
727 if (err <= 0) {
728 pr_err("Couldn't record tracing data.\n");
729 return err;
730 }
731 advance_output(err);
732 }
733 }
734
735 machine = perf_session__find_host_machine(session);
736 if (!machine) {
737 pr_err("Couldn't find native kernel information.\n");
738 return -1;
739 }
740
741 err = event__synthesize_kernel_mmap(process_synthesized_event,
742 session, machine, "_text");
743 if (err < 0)
744 err = event__synthesize_kernel_mmap(process_synthesized_event,
745 session, machine, "_stext");
746 if (err < 0)
747 pr_err("Couldn't record kernel reference relocation symbol\n"
748 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
749 "Check /proc/kallsyms permission or run as root.\n");
750
751 err = event__synthesize_modules(process_synthesized_event,
752 session, machine);
753 if (err < 0)
754 pr_err("Couldn't record kernel module information.\n"
755 "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
756 "Check /proc/modules permission or run as root.\n");
757
758 if (perf_guest)
759 perf_session__process_machines(session, event__synthesize_guest_os);
760
761 if (!system_wide)
762 event__synthesize_thread_map(threads, process_synthesized_event,
763 session);
764 else
765 event__synthesize_threads(process_synthesized_event, session);
766
767 if (realtime_prio) {
768 struct sched_param param;
769
770 param.sched_priority = realtime_prio;
771 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
772 pr_err("Could not set realtime priority.\n");
773 exit(-1);
774 }
775 }
776
777 /*
778 * Let the child rip
779 */
780 if (forks)
781 close(go_pipe[1]);
782
783 for (;;) {
784 int hits = samples;
785 int thread;
786
787 mmap_read_all();
788
789 if (hits == samples) {
790 if (done)
791 break;
792 err = poll(event_array, nr_poll, -1);
793 waking++;
794 }
795
796 if (done) {
797 for (i = 0; i < nr_cpu; i++) {
798 struct perf_evsel *pos;
799
800 list_for_each_entry(pos, &evsel_list, node) {
801 for (thread = 0;
802 thread < threads->nr;
803 thread++)
804 ioctl(FD(pos, i, thread),
805 PERF_EVENT_IOC_DISABLE);
806 }
807 }
808 }
809 }
810
811 if (quiet || signr == SIGUSR1)
812 return 0;
813
814 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
815
816 /*
817 * Approximate RIP event size: 24 bytes.
818 */
819 fprintf(stderr,
820 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
821 (double)bytes_written / 1024.0 / 1024.0,
822 output_name,
823 bytes_written / 24);
824
825 return 0;
826
827 out_delete_session:
828 perf_session__delete(session);
829 return err;
830 }
831
832 static const char * const record_usage[] = {
833 "perf record [<options>] [<command>]",
834 "perf record [<options>] -- <command> [<options>]",
835 NULL
836 };
837
838 static bool force, append_file;
839
840 const struct option record_options[] = {
841 OPT_CALLBACK('e', "event", NULL, "event",
842 "event selector. use 'perf list' to list available events",
843 parse_events),
844 OPT_CALLBACK(0, "filter", NULL, "filter",
845 "event filter", parse_filter),
846 OPT_INTEGER('p', "pid", &target_pid,
847 "record events on existing process id"),
848 OPT_INTEGER('t', "tid", &target_tid,
849 "record events on existing thread id"),
850 OPT_INTEGER('r', "realtime", &realtime_prio,
851 "collect data with this RT SCHED_FIFO priority"),
852 OPT_BOOLEAN('D', "no-delay", &nodelay,
853 "collect data without buffering"),
854 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
855 "collect raw sample records from all opened counters"),
856 OPT_BOOLEAN('a', "all-cpus", &system_wide,
857 "system-wide collection from all CPUs"),
858 OPT_BOOLEAN('A', "append", &append_file,
859 "append to the output file to do incremental profiling"),
860 OPT_STRING('C', "cpu", &cpu_list, "cpu",
861 "list of cpus to monitor"),
862 OPT_BOOLEAN('f', "force", &force,
863 "overwrite existing data file (deprecated)"),
864 OPT_U64('c', "count", &user_interval, "event period to sample"),
865 OPT_STRING('o', "output", &output_name, "file",
866 "output file name"),
867 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
868 "child tasks do not inherit counters"),
869 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
870 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
871 OPT_BOOLEAN('g', "call-graph", &call_graph,
872 "do call-graph (stack chain/backtrace) recording"),
873 OPT_INCR('v', "verbose", &verbose,
874 "be more verbose (show counter open errors, etc)"),
875 OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
876 OPT_BOOLEAN('s', "stat", &inherit_stat,
877 "per thread counts"),
878 OPT_BOOLEAN('d', "data", &sample_address,
879 "Sample addresses"),
880 OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"),
881 OPT_BOOLEAN('n', "no-samples", &no_samples,
882 "don't sample"),
883 OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
884 "do not update the buildid cache"),
885 OPT_BOOLEAN('B', "no-buildid", &no_buildid,
886 "do not collect buildids in perf.data"),
887 OPT_END()
888 };
889
890 int cmd_record(int argc, const char **argv, const char *prefix __used)
891 {
892 int err = -ENOMEM;
893 struct perf_evsel *pos;
894
895 argc = parse_options(argc, argv, record_options, record_usage,
896 PARSE_OPT_STOP_AT_NON_OPTION);
897 if (!argc && target_pid == -1 && target_tid == -1 &&
898 !system_wide && !cpu_list)
899 usage_with_options(record_usage, record_options);
900
901 if (force && append_file) {
902 fprintf(stderr, "Can't overwrite and append at the same time."
903 " You need to choose between -f and -A");
904 usage_with_options(record_usage, record_options);
905 } else if (append_file) {
906 write_mode = WRITE_APPEND;
907 } else {
908 write_mode = WRITE_FORCE;
909 }
910
911 symbol__init();
912
913 if (no_buildid_cache || no_buildid)
914 disable_buildid_cache();
915
916 if (list_empty(&evsel_list) && perf_evsel_list__create_default() < 0) {
917 pr_err("Not enough memory for event selector list\n");
918 goto out_symbol_exit;
919 }
920
921 if (target_pid != -1)
922 target_tid = target_pid;
923
924 threads = thread_map__new(target_pid, target_tid);
925 if (threads == NULL) {
926 pr_err("Problems finding threads of monitor\n");
927 usage_with_options(record_usage, record_options);
928 }
929
930 cpus = cpu_map__new(cpu_list);
931 if (cpus == NULL) {
932 perror("failed to parse CPUs map");
933 return -1;
934 }
935
936 list_for_each_entry(pos, &evsel_list, node) {
937 if (perf_evsel__alloc_fd(pos, cpus->nr, threads->nr) < 0)
938 goto out_free_fd;
939 if (perf_header__push_event(pos->attr.config, event_name(pos)))
940 goto out_free_fd;
941 }
942 event_array = malloc((sizeof(struct pollfd) * MAX_NR_CPUS *
943 MAX_COUNTERS * threads->nr));
944 if (!event_array)
945 goto out_free_fd;
946
947 if (user_interval != ULLONG_MAX)
948 default_interval = user_interval;
949 if (user_freq != UINT_MAX)
950 freq = user_freq;
951
952 /*
953 * User specified count overrides default frequency.
954 */
955 if (default_interval)
956 freq = 0;
957 else if (freq) {
958 default_interval = freq;
959 } else {
960 fprintf(stderr, "frequency and count are zero, aborting\n");
961 err = -EINVAL;
962 goto out_free_event_array;
963 }
964
965 err = __cmd_record(argc, argv);
966
967 out_free_event_array:
968 free(event_array);
969 out_free_fd:
970 thread_map__delete(threads);
971 threads = NULL;
972 out_symbol_exit:
973 symbol__exit();
974 return err;
975 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree