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Merge branch 'msm-mmc_sdcc' of git://codeaurora.org/quic/kernel/dwalker/linux-msm
[deliverable/linux.git] / tools / perf / builtin-record.c
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/debug.h"
22 #include "util/session.h"
23 #include "util/symbol.h"
24 #include "util/cpumap.h"
25
26 #include <unistd.h>
27 #include <sched.h>
28
29 enum write_mode_t {
30 WRITE_FORCE,
31 WRITE_APPEND
32 };
33
34 static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
35
36 static u64 user_interval = ULLONG_MAX;
37 static u64 default_interval = 0;
38
39 static int nr_cpus = 0;
40 static unsigned int page_size;
41 static unsigned int mmap_pages = 128;
42 static unsigned int user_freq = UINT_MAX;
43 static int freq = 1000;
44 static int output;
45 static int pipe_output = 0;
46 static const char *output_name = "perf.data";
47 static int group = 0;
48 static int realtime_prio = 0;
49 static bool raw_samples = false;
50 static bool system_wide = false;
51 static int profile_cpu = -1;
52 static pid_t target_pid = -1;
53 static pid_t target_tid = -1;
54 static pid_t *all_tids = NULL;
55 static int thread_num = 0;
56 static pid_t child_pid = -1;
57 static bool no_inherit = false;
58 static enum write_mode_t write_mode = WRITE_FORCE;
59 static bool call_graph = false;
60 static bool inherit_stat = false;
61 static bool no_samples = false;
62 static bool sample_address = false;
63 static bool multiplex = false;
64 static int multiplex_fd = -1;
65
66 static long samples = 0;
67 static struct timeval last_read;
68 static struct timeval this_read;
69
70 static u64 bytes_written = 0;
71
72 static struct pollfd *event_array;
73
74 static int nr_poll = 0;
75 static int nr_cpu = 0;
76
77 static int file_new = 1;
78 static off_t post_processing_offset;
79
80 static struct perf_session *session;
81
82 struct mmap_data {
83 int counter;
84 void *base;
85 unsigned int mask;
86 unsigned int prev;
87 };
88
89 static struct mmap_data *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
90
91 static unsigned long mmap_read_head(struct mmap_data *md)
92 {
93 struct perf_event_mmap_page *pc = md->base;
94 long head;
95
96 head = pc->data_head;
97 rmb();
98
99 return head;
100 }
101
102 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
103 {
104 struct perf_event_mmap_page *pc = md->base;
105
106 /*
107 * ensure all reads are done before we write the tail out.
108 */
109 /* mb(); */
110 pc->data_tail = tail;
111 }
112
113 static void advance_output(size_t size)
114 {
115 bytes_written += size;
116 }
117
118 static void write_output(void *buf, size_t size)
119 {
120 while (size) {
121 int ret = write(output, buf, size);
122
123 if (ret < 0)
124 die("failed to write");
125
126 size -= ret;
127 buf += ret;
128
129 bytes_written += ret;
130 }
131 }
132
133 static int process_synthesized_event(event_t *event,
134 struct perf_session *self __used)
135 {
136 write_output(event, event->header.size);
137 return 0;
138 }
139
140 static void mmap_read(struct mmap_data *md)
141 {
142 unsigned int head = mmap_read_head(md);
143 unsigned int old = md->prev;
144 unsigned char *data = md->base + page_size;
145 unsigned long size;
146 void *buf;
147 int diff;
148
149 gettimeofday(&this_read, NULL);
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 struct timeval iv;
162 unsigned long msecs;
163
164 timersub(&this_read, &last_read, &iv);
165 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
166
167 fprintf(stderr, "WARNING: failed to keep up with mmap data."
168 " Last read %lu msecs ago.\n", msecs);
169
170 /*
171 * head points to a known good entry, start there.
172 */
173 old = head;
174 }
175
176 last_read = this_read;
177
178 if (old != head)
179 samples++;
180
181 size = head - old;
182
183 if ((old & md->mask) + size != (head & md->mask)) {
184 buf = &data[old & md->mask];
185 size = md->mask + 1 - (old & md->mask);
186 old += size;
187
188 write_output(buf, size);
189 }
190
191 buf = &data[old & md->mask];
192 size = head - old;
193 old += size;
194
195 write_output(buf, size);
196
197 md->prev = old;
198 mmap_write_tail(md, old);
199 }
200
201 static volatile int done = 0;
202 static volatile int signr = -1;
203
204 static void sig_handler(int sig)
205 {
206 done = 1;
207 signr = sig;
208 }
209
210 static void sig_atexit(void)
211 {
212 if (child_pid != -1)
213 kill(child_pid, SIGTERM);
214
215 if (signr == -1)
216 return;
217
218 signal(signr, SIG_DFL);
219 kill(getpid(), signr);
220 }
221
222 static int group_fd;
223
224 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
225 {
226 struct perf_header_attr *h_attr;
227
228 if (nr < session->header.attrs) {
229 h_attr = session->header.attr[nr];
230 } else {
231 h_attr = perf_header_attr__new(a);
232 if (h_attr != NULL)
233 if (perf_header__add_attr(&session->header, h_attr) < 0) {
234 perf_header_attr__delete(h_attr);
235 h_attr = NULL;
236 }
237 }
238
239 return h_attr;
240 }
241
242 static void create_counter(int counter, int cpu)
243 {
244 char *filter = filters[counter];
245 struct perf_event_attr *attr = attrs + counter;
246 struct perf_header_attr *h_attr;
247 int track = !counter; /* only the first counter needs these */
248 int thread_index;
249 int ret;
250 struct {
251 u64 count;
252 u64 time_enabled;
253 u64 time_running;
254 u64 id;
255 } read_data;
256
257 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
258 PERF_FORMAT_TOTAL_TIME_RUNNING |
259 PERF_FORMAT_ID;
260
261 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
262
263 if (nr_counters > 1)
264 attr->sample_type |= PERF_SAMPLE_ID;
265
266 /*
267 * We default some events to a 1 default interval. But keep
268 * it a weak assumption overridable by the user.
269 */
270 if (!attr->sample_period || (user_freq != UINT_MAX &&
271 user_interval != ULLONG_MAX)) {
272 if (freq) {
273 attr->sample_type |= PERF_SAMPLE_PERIOD;
274 attr->freq = 1;
275 attr->sample_freq = freq;
276 } else {
277 attr->sample_period = default_interval;
278 }
279 }
280
281 if (no_samples)
282 attr->sample_freq = 0;
283
284 if (inherit_stat)
285 attr->inherit_stat = 1;
286
287 if (sample_address)
288 attr->sample_type |= PERF_SAMPLE_ADDR;
289
290 if (call_graph)
291 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
292
293 if (raw_samples) {
294 attr->sample_type |= PERF_SAMPLE_TIME;
295 attr->sample_type |= PERF_SAMPLE_RAW;
296 attr->sample_type |= PERF_SAMPLE_CPU;
297 }
298
299 attr->mmap = track;
300 attr->comm = track;
301 attr->inherit = !no_inherit;
302 if (target_pid == -1 && target_tid == -1 && !system_wide) {
303 attr->disabled = 1;
304 attr->enable_on_exec = 1;
305 }
306
307 for (thread_index = 0; thread_index < thread_num; thread_index++) {
308 try_again:
309 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
310 all_tids[thread_index], cpu, group_fd, 0);
311
312 if (fd[nr_cpu][counter][thread_index] < 0) {
313 int err = errno;
314
315 if (err == EPERM || err == EACCES)
316 die("Permission error - are you root?\n"
317 "\t Consider tweaking"
318 " /proc/sys/kernel/perf_event_paranoid.\n");
319 else if (err == ENODEV && profile_cpu != -1) {
320 die("No such device - did you specify"
321 " an out-of-range profile CPU?\n");
322 }
323
324 /*
325 * If it's cycles then fall back to hrtimer
326 * based cpu-clock-tick sw counter, which
327 * is always available even if no PMU support:
328 */
329 if (attr->type == PERF_TYPE_HARDWARE
330 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
331
332 if (verbose)
333 warning(" ... trying to fall back to cpu-clock-ticks\n");
334 attr->type = PERF_TYPE_SOFTWARE;
335 attr->config = PERF_COUNT_SW_CPU_CLOCK;
336 goto try_again;
337 }
338 printf("\n");
339 error("perfcounter syscall returned with %d (%s)\n",
340 fd[nr_cpu][counter][thread_index], strerror(err));
341
342 #if defined(__i386__) || defined(__x86_64__)
343 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
344 die("No hardware sampling interrupt available."
345 " No APIC? If so then you can boot the kernel"
346 " with the \"lapic\" boot parameter to"
347 " force-enable it.\n");
348 #endif
349
350 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
351 exit(-1);
352 }
353
354 h_attr = get_header_attr(attr, counter);
355 if (h_attr == NULL)
356 die("nomem\n");
357
358 if (!file_new) {
359 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
360 fprintf(stderr, "incompatible append\n");
361 exit(-1);
362 }
363 }
364
365 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
366 perror("Unable to read perf file descriptor\n");
367 exit(-1);
368 }
369
370 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
371 pr_warning("Not enough memory to add id\n");
372 exit(-1);
373 }
374
375 assert(fd[nr_cpu][counter][thread_index] >= 0);
376 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
377
378 /*
379 * First counter acts as the group leader:
380 */
381 if (group && group_fd == -1)
382 group_fd = fd[nr_cpu][counter][thread_index];
383 if (multiplex && multiplex_fd == -1)
384 multiplex_fd = fd[nr_cpu][counter][thread_index];
385
386 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
387
388 ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
389 assert(ret != -1);
390 } else {
391 event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
392 event_array[nr_poll].events = POLLIN;
393 nr_poll++;
394
395 mmap_array[nr_cpu][counter][thread_index].counter = counter;
396 mmap_array[nr_cpu][counter][thread_index].prev = 0;
397 mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
398 mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
399 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
400 if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
401 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
402 exit(-1);
403 }
404 }
405
406 if (filter != NULL) {
407 ret = ioctl(fd[nr_cpu][counter][thread_index],
408 PERF_EVENT_IOC_SET_FILTER, filter);
409 if (ret) {
410 error("failed to set filter with %d (%s)\n", errno,
411 strerror(errno));
412 exit(-1);
413 }
414 }
415 }
416 }
417
418 static void open_counters(int cpu)
419 {
420 int counter;
421
422 group_fd = -1;
423 for (counter = 0; counter < nr_counters; counter++)
424 create_counter(counter, cpu);
425
426 nr_cpu++;
427 }
428
429 static int process_buildids(void)
430 {
431 u64 size = lseek(output, 0, SEEK_CUR);
432
433 if (size == 0)
434 return 0;
435
436 session->fd = output;
437 return __perf_session__process_events(session, post_processing_offset,
438 size - post_processing_offset,
439 size, &build_id__mark_dso_hit_ops);
440 }
441
442 static void atexit_header(void)
443 {
444 if (!pipe_output) {
445 session->header.data_size += bytes_written;
446
447 process_buildids();
448 perf_header__write(&session->header, output, true);
449 }
450 }
451
452 static void event__synthesize_guest_os(struct machine *machine, void *data)
453 {
454 int err;
455 char *guest_kallsyms;
456 char path[PATH_MAX];
457 struct perf_session *psession = data;
458
459 if (machine__is_host(machine))
460 return;
461
462 /*
463 *As for guest kernel when processing subcommand record&report,
464 *we arrange module mmap prior to guest kernel mmap and trigger
465 *a preload dso because default guest module symbols are loaded
466 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
467 *method is used to avoid symbol missing when the first addr is
468 *in module instead of in guest kernel.
469 */
470 err = event__synthesize_modules(process_synthesized_event,
471 psession, machine);
472 if (err < 0)
473 pr_err("Couldn't record guest kernel [%d]'s reference"
474 " relocation symbol.\n", machine->pid);
475
476 if (machine__is_default_guest(machine))
477 guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
478 else {
479 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
480 guest_kallsyms = path;
481 }
482
483 /*
484 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
485 * have no _text sometimes.
486 */
487 err = event__synthesize_kernel_mmap(process_synthesized_event,
488 psession, machine, "_text");
489 if (err < 0)
490 err = event__synthesize_kernel_mmap(process_synthesized_event,
491 psession, machine, "_stext");
492 if (err < 0)
493 pr_err("Couldn't record guest kernel [%d]'s reference"
494 " relocation symbol.\n", machine->pid);
495 }
496
497 static struct perf_event_header finished_round_event = {
498 .size = sizeof(struct perf_event_header),
499 .type = PERF_RECORD_FINISHED_ROUND,
500 };
501
502 static void mmap_read_all(void)
503 {
504 int i, counter, thread;
505
506 for (i = 0; i < nr_cpu; i++) {
507 for (counter = 0; counter < nr_counters; counter++) {
508 for (thread = 0; thread < thread_num; thread++) {
509 if (mmap_array[i][counter][thread].base)
510 mmap_read(&mmap_array[i][counter][thread]);
511 }
512
513 }
514 }
515
516 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
517 write_output(&finished_round_event, sizeof(finished_round_event));
518 }
519
520 static int __cmd_record(int argc, const char **argv)
521 {
522 int i, counter;
523 struct stat st;
524 pid_t pid = 0;
525 int flags;
526 int err;
527 unsigned long waking = 0;
528 int child_ready_pipe[2], go_pipe[2];
529 const bool forks = argc > 0;
530 char buf;
531 struct machine *machine;
532
533 page_size = sysconf(_SC_PAGE_SIZE);
534
535 atexit(sig_atexit);
536 signal(SIGCHLD, sig_handler);
537 signal(SIGINT, sig_handler);
538
539 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
540 perror("failed to create pipes");
541 exit(-1);
542 }
543
544 if (!strcmp(output_name, "-"))
545 pipe_output = 1;
546 else if (!stat(output_name, &st) && st.st_size) {
547 if (write_mode == WRITE_FORCE) {
548 char oldname[PATH_MAX];
549 snprintf(oldname, sizeof(oldname), "%s.old",
550 output_name);
551 unlink(oldname);
552 rename(output_name, oldname);
553 }
554 } else if (write_mode == WRITE_APPEND) {
555 write_mode = WRITE_FORCE;
556 }
557
558 flags = O_CREAT|O_RDWR;
559 if (write_mode == WRITE_APPEND)
560 file_new = 0;
561 else
562 flags |= O_TRUNC;
563
564 if (pipe_output)
565 output = STDOUT_FILENO;
566 else
567 output = open(output_name, flags, S_IRUSR | S_IWUSR);
568 if (output < 0) {
569 perror("failed to create output file");
570 exit(-1);
571 }
572
573 session = perf_session__new(output_name, O_WRONLY,
574 write_mode == WRITE_FORCE, false);
575 if (session == NULL) {
576 pr_err("Not enough memory for reading perf file header\n");
577 return -1;
578 }
579
580 if (!file_new) {
581 err = perf_header__read(session, output);
582 if (err < 0)
583 return err;
584 }
585
586 if (have_tracepoints(attrs, nr_counters))
587 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
588
589 atexit(atexit_header);
590
591 if (forks) {
592 child_pid = fork();
593 if (pid < 0) {
594 perror("failed to fork");
595 exit(-1);
596 }
597
598 if (!child_pid) {
599 if (pipe_output)
600 dup2(2, 1);
601 close(child_ready_pipe[0]);
602 close(go_pipe[1]);
603 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
604
605 /*
606 * Do a dummy execvp to get the PLT entry resolved,
607 * so we avoid the resolver overhead on the real
608 * execvp call.
609 */
610 execvp("", (char **)argv);
611
612 /*
613 * Tell the parent we're ready to go
614 */
615 close(child_ready_pipe[1]);
616
617 /*
618 * Wait until the parent tells us to go.
619 */
620 if (read(go_pipe[0], &buf, 1) == -1)
621 perror("unable to read pipe");
622
623 execvp(argv[0], (char **)argv);
624
625 perror(argv[0]);
626 exit(-1);
627 }
628
629 if (!system_wide && target_tid == -1 && target_pid == -1)
630 all_tids[0] = child_pid;
631
632 close(child_ready_pipe[1]);
633 close(go_pipe[0]);
634 /*
635 * wait for child to settle
636 */
637 if (read(child_ready_pipe[0], &buf, 1) == -1) {
638 perror("unable to read pipe");
639 exit(-1);
640 }
641 close(child_ready_pipe[0]);
642 }
643
644 if ((!system_wide && no_inherit) || profile_cpu != -1) {
645 open_counters(profile_cpu);
646 } else {
647 nr_cpus = read_cpu_map();
648 for (i = 0; i < nr_cpus; i++)
649 open_counters(cpumap[i]);
650 }
651
652 if (pipe_output) {
653 err = perf_header__write_pipe(output);
654 if (err < 0)
655 return err;
656 } else if (file_new) {
657 err = perf_header__write(&session->header, output, false);
658 if (err < 0)
659 return err;
660 }
661
662 post_processing_offset = lseek(output, 0, SEEK_CUR);
663
664 if (pipe_output) {
665 err = event__synthesize_attrs(&session->header,
666 process_synthesized_event,
667 session);
668 if (err < 0) {
669 pr_err("Couldn't synthesize attrs.\n");
670 return err;
671 }
672
673 err = event__synthesize_event_types(process_synthesized_event,
674 session);
675 if (err < 0) {
676 pr_err("Couldn't synthesize event_types.\n");
677 return err;
678 }
679
680 if (have_tracepoints(attrs, nr_counters)) {
681 /*
682 * FIXME err <= 0 here actually means that
683 * there were no tracepoints so its not really
684 * an error, just that we don't need to
685 * synthesize anything. We really have to
686 * return this more properly and also
687 * propagate errors that now are calling die()
688 */
689 err = event__synthesize_tracing_data(output, attrs,
690 nr_counters,
691 process_synthesized_event,
692 session);
693 if (err <= 0) {
694 pr_err("Couldn't record tracing data.\n");
695 return err;
696 }
697 advance_output(err);
698 }
699 }
700
701 machine = perf_session__find_host_machine(session);
702 if (!machine) {
703 pr_err("Couldn't find native kernel information.\n");
704 return -1;
705 }
706
707 err = event__synthesize_kernel_mmap(process_synthesized_event,
708 session, machine, "_text");
709 if (err < 0)
710 err = event__synthesize_kernel_mmap(process_synthesized_event,
711 session, machine, "_stext");
712 if (err < 0) {
713 pr_err("Couldn't record kernel reference relocation symbol.\n");
714 return err;
715 }
716
717 err = event__synthesize_modules(process_synthesized_event,
718 session, machine);
719 if (err < 0) {
720 pr_err("Couldn't record kernel reference relocation symbol.\n");
721 return err;
722 }
723 if (perf_guest)
724 perf_session__process_machines(session, event__synthesize_guest_os);
725
726 if (!system_wide && profile_cpu == -1)
727 event__synthesize_thread(target_tid, process_synthesized_event,
728 session);
729 else
730 event__synthesize_threads(process_synthesized_event, session);
731
732 if (realtime_prio) {
733 struct sched_param param;
734
735 param.sched_priority = realtime_prio;
736 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
737 pr_err("Could not set realtime priority.\n");
738 exit(-1);
739 }
740 }
741
742 /*
743 * Let the child rip
744 */
745 if (forks)
746 close(go_pipe[1]);
747
748 for (;;) {
749 int hits = samples;
750 int thread;
751
752 mmap_read_all();
753
754 if (hits == samples) {
755 if (done)
756 break;
757 err = poll(event_array, nr_poll, -1);
758 waking++;
759 }
760
761 if (done) {
762 for (i = 0; i < nr_cpu; i++) {
763 for (counter = 0;
764 counter < nr_counters;
765 counter++) {
766 for (thread = 0;
767 thread < thread_num;
768 thread++)
769 ioctl(fd[i][counter][thread],
770 PERF_EVENT_IOC_DISABLE);
771 }
772 }
773 }
774 }
775
776 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
777
778 /*
779 * Approximate RIP event size: 24 bytes.
780 */
781 fprintf(stderr,
782 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
783 (double)bytes_written / 1024.0 / 1024.0,
784 output_name,
785 bytes_written / 24);
786
787 return 0;
788 }
789
790 static const char * const record_usage[] = {
791 "perf record [<options>] [<command>]",
792 "perf record [<options>] -- <command> [<options>]",
793 NULL
794 };
795
796 static bool force, append_file;
797
798 static const struct option options[] = {
799 OPT_CALLBACK('e', "event", NULL, "event",
800 "event selector. use 'perf list' to list available events",
801 parse_events),
802 OPT_CALLBACK(0, "filter", NULL, "filter",
803 "event filter", parse_filter),
804 OPT_INTEGER('p', "pid", &target_pid,
805 "record events on existing process id"),
806 OPT_INTEGER('t', "tid", &target_tid,
807 "record events on existing thread id"),
808 OPT_INTEGER('r', "realtime", &realtime_prio,
809 "collect data with this RT SCHED_FIFO priority"),
810 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
811 "collect raw sample records from all opened counters"),
812 OPT_BOOLEAN('a', "all-cpus", &system_wide,
813 "system-wide collection from all CPUs"),
814 OPT_BOOLEAN('A', "append", &append_file,
815 "append to the output file to do incremental profiling"),
816 OPT_INTEGER('C', "profile_cpu", &profile_cpu,
817 "CPU to profile on"),
818 OPT_BOOLEAN('f', "force", &force,
819 "overwrite existing data file (deprecated)"),
820 OPT_U64('c', "count", &user_interval, "event period to sample"),
821 OPT_STRING('o', "output", &output_name, "file",
822 "output file name"),
823 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
824 "child tasks do not inherit counters"),
825 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
826 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
827 OPT_BOOLEAN('g', "call-graph", &call_graph,
828 "do call-graph (stack chain/backtrace) recording"),
829 OPT_INCR('v', "verbose", &verbose,
830 "be more verbose (show counter open errors, etc)"),
831 OPT_BOOLEAN('s', "stat", &inherit_stat,
832 "per thread counts"),
833 OPT_BOOLEAN('d', "data", &sample_address,
834 "Sample addresses"),
835 OPT_BOOLEAN('n', "no-samples", &no_samples,
836 "don't sample"),
837 OPT_BOOLEAN('M', "multiplex", &multiplex,
838 "multiplex counter output in a single channel"),
839 OPT_END()
840 };
841
842 int cmd_record(int argc, const char **argv, const char *prefix __used)
843 {
844 int i,j;
845
846 argc = parse_options(argc, argv, options, record_usage,
847 PARSE_OPT_STOP_AT_NON_OPTION);
848 if (!argc && target_pid == -1 && target_tid == -1 &&
849 !system_wide && profile_cpu == -1)
850 usage_with_options(record_usage, options);
851
852 if (force && append_file) {
853 fprintf(stderr, "Can't overwrite and append at the same time."
854 " You need to choose between -f and -A");
855 usage_with_options(record_usage, options);
856 } else if (append_file) {
857 write_mode = WRITE_APPEND;
858 } else {
859 write_mode = WRITE_FORCE;
860 }
861
862 symbol__init();
863
864 if (!nr_counters) {
865 nr_counters = 1;
866 attrs[0].type = PERF_TYPE_HARDWARE;
867 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
868 }
869
870 if (target_pid != -1) {
871 target_tid = target_pid;
872 thread_num = find_all_tid(target_pid, &all_tids);
873 if (thread_num <= 0) {
874 fprintf(stderr, "Can't find all threads of pid %d\n",
875 target_pid);
876 usage_with_options(record_usage, options);
877 }
878 } else {
879 all_tids=malloc(sizeof(pid_t));
880 if (!all_tids)
881 return -ENOMEM;
882
883 all_tids[0] = target_tid;
884 thread_num = 1;
885 }
886
887 for (i = 0; i < MAX_NR_CPUS; i++) {
888 for (j = 0; j < MAX_COUNTERS; j++) {
889 fd[i][j] = malloc(sizeof(int)*thread_num);
890 mmap_array[i][j] = zalloc(
891 sizeof(struct mmap_data)*thread_num);
892 if (!fd[i][j] || !mmap_array[i][j])
893 return -ENOMEM;
894 }
895 }
896 event_array = malloc(
897 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
898 if (!event_array)
899 return -ENOMEM;
900
901 if (user_interval != ULLONG_MAX)
902 default_interval = user_interval;
903 if (user_freq != UINT_MAX)
904 freq = user_freq;
905
906 /*
907 * User specified count overrides default frequency.
908 */
909 if (default_interval)
910 freq = 0;
911 else if (freq) {
912 default_interval = freq;
913 } else {
914 fprintf(stderr, "frequency and count are zero, aborting\n");
915 exit(EXIT_FAILURE);
916 }
917
918 return __cmd_record(argc, argv);
919 }
Linux kernel - Deliverables
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