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perf: Add non-exec mmap() tracking
[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 #include <sys/mman.h>
29
30 enum write_mode_t {
31 WRITE_FORCE,
32 WRITE_APPEND
33 };
34
35 static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
36
37 static u64 user_interval = ULLONG_MAX;
38 static u64 default_interval = 0;
39
40 static int nr_cpus = 0;
41 static unsigned int page_size;
42 static unsigned int mmap_pages = 128;
43 static unsigned int user_freq = UINT_MAX;
44 static int freq = 1000;
45 static int output;
46 static int pipe_output = 0;
47 static const char *output_name = "perf.data";
48 static int group = 0;
49 static int realtime_prio = 0;
50 static bool raw_samples = false;
51 static bool system_wide = false;
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
64 static long samples = 0;
65 static u64 bytes_written = 0;
66
67 static struct pollfd *event_array;
68
69 static int nr_poll = 0;
70 static int nr_cpu = 0;
71
72 static int file_new = 1;
73 static off_t post_processing_offset;
74
75 static struct perf_session *session;
76 static const char *cpu_list;
77
78 struct mmap_data {
79 int counter;
80 void *base;
81 unsigned int mask;
82 unsigned int prev;
83 };
84
85 static struct mmap_data mmap_array[MAX_NR_CPUS];
86
87 static unsigned long mmap_read_head(struct mmap_data *md)
88 {
89 struct perf_event_mmap_page *pc = md->base;
90 long head;
91
92 head = pc->data_head;
93 rmb();
94
95 return head;
96 }
97
98 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
99 {
100 struct perf_event_mmap_page *pc = md->base;
101
102 /*
103 * ensure all reads are done before we write the tail out.
104 */
105 /* mb(); */
106 pc->data_tail = tail;
107 }
108
109 static void advance_output(size_t size)
110 {
111 bytes_written += size;
112 }
113
114 static void write_output(void *buf, size_t size)
115 {
116 while (size) {
117 int ret = write(output, buf, size);
118
119 if (ret < 0)
120 die("failed to write");
121
122 size -= ret;
123 buf += ret;
124
125 bytes_written += ret;
126 }
127 }
128
129 static int process_synthesized_event(event_t *event,
130 struct perf_session *self __used)
131 {
132 write_output(event, event->header.size);
133 return 0;
134 }
135
136 static void mmap_read(struct mmap_data *md)
137 {
138 unsigned int head = mmap_read_head(md);
139 unsigned int old = md->prev;
140 unsigned char *data = md->base + page_size;
141 unsigned long size;
142 void *buf;
143 int diff;
144
145 /*
146 * If we're further behind than half the buffer, there's a chance
147 * the writer will bite our tail and mess up the samples under us.
148 *
149 * If we somehow ended up ahead of the head, we got messed up.
150 *
151 * In either case, truncate and restart at head.
152 */
153 diff = head - old;
154 if (diff < 0) {
155 fprintf(stderr, "WARNING: failed to keep up with mmap data\n");
156 /*
157 * head points to a known good entry, start there.
158 */
159 old = head;
160 }
161
162 if (old != head)
163 samples++;
164
165 size = head - old;
166
167 if ((old & md->mask) + size != (head & md->mask)) {
168 buf = &data[old & md->mask];
169 size = md->mask + 1 - (old & md->mask);
170 old += size;
171
172 write_output(buf, size);
173 }
174
175 buf = &data[old & md->mask];
176 size = head - old;
177 old += size;
178
179 write_output(buf, size);
180
181 md->prev = old;
182 mmap_write_tail(md, old);
183 }
184
185 static volatile int done = 0;
186 static volatile int signr = -1;
187
188 static void sig_handler(int sig)
189 {
190 done = 1;
191 signr = sig;
192 }
193
194 static void sig_atexit(void)
195 {
196 if (child_pid != -1)
197 kill(child_pid, SIGTERM);
198
199 if (signr == -1)
200 return;
201
202 signal(signr, SIG_DFL);
203 kill(getpid(), signr);
204 }
205
206 static int group_fd;
207
208 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
209 {
210 struct perf_header_attr *h_attr;
211
212 if (nr < session->header.attrs) {
213 h_attr = session->header.attr[nr];
214 } else {
215 h_attr = perf_header_attr__new(a);
216 if (h_attr != NULL)
217 if (perf_header__add_attr(&session->header, h_attr) < 0) {
218 perf_header_attr__delete(h_attr);
219 h_attr = NULL;
220 }
221 }
222
223 return h_attr;
224 }
225
226 static void create_counter(int counter, int cpu)
227 {
228 char *filter = filters[counter];
229 struct perf_event_attr *attr = attrs + counter;
230 struct perf_header_attr *h_attr;
231 int track = !counter; /* only the first counter needs these */
232 int thread_index;
233 int ret;
234 struct {
235 u64 count;
236 u64 time_enabled;
237 u64 time_running;
238 u64 id;
239 } read_data;
240
241 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
242 PERF_FORMAT_TOTAL_TIME_RUNNING |
243 PERF_FORMAT_ID;
244
245 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
246
247 if (nr_counters > 1)
248 attr->sample_type |= PERF_SAMPLE_ID;
249
250 /*
251 * We default some events to a 1 default interval. But keep
252 * it a weak assumption overridable by the user.
253 */
254 if (!attr->sample_period || (user_freq != UINT_MAX &&
255 user_interval != ULLONG_MAX)) {
256 if (freq) {
257 attr->sample_type |= PERF_SAMPLE_PERIOD;
258 attr->freq = 1;
259 attr->sample_freq = freq;
260 } else {
261 attr->sample_period = default_interval;
262 }
263 }
264
265 if (no_samples)
266 attr->sample_freq = 0;
267
268 if (inherit_stat)
269 attr->inherit_stat = 1;
270
271 if (sample_address) {
272 attr->sample_type |= PERF_SAMPLE_ADDR;
273 attr->mmap_data = track;
274 }
275
276 if (call_graph)
277 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
278
279 if (system_wide)
280 attr->sample_type |= PERF_SAMPLE_CPU;
281
282 if (raw_samples) {
283 attr->sample_type |= PERF_SAMPLE_TIME;
284 attr->sample_type |= PERF_SAMPLE_RAW;
285 attr->sample_type |= PERF_SAMPLE_CPU;
286 }
287
288 attr->mmap = track;
289 attr->comm = track;
290 attr->inherit = !no_inherit;
291 if (target_pid == -1 && target_tid == -1 && !system_wide) {
292 attr->disabled = 1;
293 attr->enable_on_exec = 1;
294 }
295
296 for (thread_index = 0; thread_index < thread_num; thread_index++) {
297 try_again:
298 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
299 all_tids[thread_index], cpu, group_fd, 0);
300
301 if (fd[nr_cpu][counter][thread_index] < 0) {
302 int err = errno;
303
304 if (err == EPERM || err == EACCES)
305 die("Permission error - are you root?\n"
306 "\t Consider tweaking"
307 " /proc/sys/kernel/perf_event_paranoid.\n");
308 else if (err == ENODEV && cpu_list) {
309 die("No such device - did you specify"
310 " an out-of-range profile CPU?\n");
311 }
312
313 /*
314 * If it's cycles then fall back to hrtimer
315 * based cpu-clock-tick sw counter, which
316 * is always available even if no PMU support:
317 */
318 if (attr->type == PERF_TYPE_HARDWARE
319 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
320
321 if (verbose)
322 warning(" ... trying to fall back to cpu-clock-ticks\n");
323 attr->type = PERF_TYPE_SOFTWARE;
324 attr->config = PERF_COUNT_SW_CPU_CLOCK;
325 goto try_again;
326 }
327 printf("\n");
328 error("perfcounter syscall returned with %d (%s)\n",
329 fd[nr_cpu][counter][thread_index], strerror(err));
330
331 #if defined(__i386__) || defined(__x86_64__)
332 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
333 die("No hardware sampling interrupt available."
334 " No APIC? If so then you can boot the kernel"
335 " with the \"lapic\" boot parameter to"
336 " force-enable it.\n");
337 #endif
338
339 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
340 exit(-1);
341 }
342
343 h_attr = get_header_attr(attr, counter);
344 if (h_attr == NULL)
345 die("nomem\n");
346
347 if (!file_new) {
348 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
349 fprintf(stderr, "incompatible append\n");
350 exit(-1);
351 }
352 }
353
354 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
355 perror("Unable to read perf file descriptor\n");
356 exit(-1);
357 }
358
359 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
360 pr_warning("Not enough memory to add id\n");
361 exit(-1);
362 }
363
364 assert(fd[nr_cpu][counter][thread_index] >= 0);
365 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
366
367 /*
368 * First counter acts as the group leader:
369 */
370 if (group && group_fd == -1)
371 group_fd = fd[nr_cpu][counter][thread_index];
372
373 if (counter || thread_index) {
374 ret = ioctl(fd[nr_cpu][counter][thread_index],
375 PERF_EVENT_IOC_SET_OUTPUT,
376 fd[nr_cpu][0][0]);
377 if (ret) {
378 error("failed to set output: %d (%s)\n", errno,
379 strerror(errno));
380 exit(-1);
381 }
382 } else {
383 mmap_array[nr_cpu].counter = counter;
384 mmap_array[nr_cpu].prev = 0;
385 mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
386 mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
387 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
388 if (mmap_array[nr_cpu].base == MAP_FAILED) {
389 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
390 exit(-1);
391 }
392
393 event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
394 event_array[nr_poll].events = POLLIN;
395 nr_poll++;
396 }
397
398 if (filter != NULL) {
399 ret = ioctl(fd[nr_cpu][counter][thread_index],
400 PERF_EVENT_IOC_SET_FILTER, filter);
401 if (ret) {
402 error("failed to set filter with %d (%s)\n", errno,
403 strerror(errno));
404 exit(-1);
405 }
406 }
407 }
408 }
409
410 static void open_counters(int cpu)
411 {
412 int counter;
413
414 group_fd = -1;
415 for (counter = 0; counter < nr_counters; counter++)
416 create_counter(counter, cpu);
417
418 nr_cpu++;
419 }
420
421 static int process_buildids(void)
422 {
423 u64 size = lseek(output, 0, SEEK_CUR);
424
425 if (size == 0)
426 return 0;
427
428 session->fd = output;
429 return __perf_session__process_events(session, post_processing_offset,
430 size - post_processing_offset,
431 size, &build_id__mark_dso_hit_ops);
432 }
433
434 static void atexit_header(void)
435 {
436 if (!pipe_output) {
437 session->header.data_size += bytes_written;
438
439 process_buildids();
440 perf_header__write(&session->header, output, true);
441 }
442 }
443
444 static void event__synthesize_guest_os(struct machine *machine, void *data)
445 {
446 int err;
447 char *guest_kallsyms;
448 char path[PATH_MAX];
449 struct perf_session *psession = data;
450
451 if (machine__is_host(machine))
452 return;
453
454 /*
455 *As for guest kernel when processing subcommand record&report,
456 *we arrange module mmap prior to guest kernel mmap and trigger
457 *a preload dso because default guest module symbols are loaded
458 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
459 *method is used to avoid symbol missing when the first addr is
460 *in module instead of in guest kernel.
461 */
462 err = event__synthesize_modules(process_synthesized_event,
463 psession, machine);
464 if (err < 0)
465 pr_err("Couldn't record guest kernel [%d]'s reference"
466 " relocation symbol.\n", machine->pid);
467
468 if (machine__is_default_guest(machine))
469 guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
470 else {
471 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
472 guest_kallsyms = path;
473 }
474
475 /*
476 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
477 * have no _text sometimes.
478 */
479 err = event__synthesize_kernel_mmap(process_synthesized_event,
480 psession, machine, "_text");
481 if (err < 0)
482 err = event__synthesize_kernel_mmap(process_synthesized_event,
483 psession, machine, "_stext");
484 if (err < 0)
485 pr_err("Couldn't record guest kernel [%d]'s reference"
486 " relocation symbol.\n", machine->pid);
487 }
488
489 static struct perf_event_header finished_round_event = {
490 .size = sizeof(struct perf_event_header),
491 .type = PERF_RECORD_FINISHED_ROUND,
492 };
493
494 static void mmap_read_all(void)
495 {
496 int i;
497
498 for (i = 0; i < nr_cpu; i++) {
499 if (mmap_array[i].base)
500 mmap_read(&mmap_array[i]);
501 }
502
503 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
504 write_output(&finished_round_event, sizeof(finished_round_event));
505 }
506
507 static int __cmd_record(int argc, const char **argv)
508 {
509 int i, counter;
510 struct stat st;
511 int flags;
512 int err;
513 unsigned long waking = 0;
514 int child_ready_pipe[2], go_pipe[2];
515 const bool forks = argc > 0;
516 char buf;
517 struct machine *machine;
518
519 page_size = sysconf(_SC_PAGE_SIZE);
520
521 atexit(sig_atexit);
522 signal(SIGCHLD, sig_handler);
523 signal(SIGINT, sig_handler);
524
525 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
526 perror("failed to create pipes");
527 exit(-1);
528 }
529
530 if (!strcmp(output_name, "-"))
531 pipe_output = 1;
532 else if (!stat(output_name, &st) && st.st_size) {
533 if (write_mode == WRITE_FORCE) {
534 char oldname[PATH_MAX];
535 snprintf(oldname, sizeof(oldname), "%s.old",
536 output_name);
537 unlink(oldname);
538 rename(output_name, oldname);
539 }
540 } else if (write_mode == WRITE_APPEND) {
541 write_mode = WRITE_FORCE;
542 }
543
544 flags = O_CREAT|O_RDWR;
545 if (write_mode == WRITE_APPEND)
546 file_new = 0;
547 else
548 flags |= O_TRUNC;
549
550 if (pipe_output)
551 output = STDOUT_FILENO;
552 else
553 output = open(output_name, flags, S_IRUSR | S_IWUSR);
554 if (output < 0) {
555 perror("failed to create output file");
556 exit(-1);
557 }
558
559 session = perf_session__new(output_name, O_WRONLY,
560 write_mode == WRITE_FORCE, false);
561 if (session == NULL) {
562 pr_err("Not enough memory for reading perf file header\n");
563 return -1;
564 }
565
566 if (!file_new) {
567 err = perf_header__read(session, output);
568 if (err < 0)
569 return err;
570 }
571
572 if (have_tracepoints(attrs, nr_counters))
573 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
574
575 atexit(atexit_header);
576
577 if (forks) {
578 child_pid = fork();
579 if (child_pid < 0) {
580 perror("failed to fork");
581 exit(-1);
582 }
583
584 if (!child_pid) {
585 if (pipe_output)
586 dup2(2, 1);
587 close(child_ready_pipe[0]);
588 close(go_pipe[1]);
589 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
590
591 /*
592 * Do a dummy execvp to get the PLT entry resolved,
593 * so we avoid the resolver overhead on the real
594 * execvp call.
595 */
596 execvp("", (char **)argv);
597
598 /*
599 * Tell the parent we're ready to go
600 */
601 close(child_ready_pipe[1]);
602
603 /*
604 * Wait until the parent tells us to go.
605 */
606 if (read(go_pipe[0], &buf, 1) == -1)
607 perror("unable to read pipe");
608
609 execvp(argv[0], (char **)argv);
610
611 perror(argv[0]);
612 exit(-1);
613 }
614
615 if (!system_wide && target_tid == -1 && target_pid == -1)
616 all_tids[0] = child_pid;
617
618 close(child_ready_pipe[1]);
619 close(go_pipe[0]);
620 /*
621 * wait for child to settle
622 */
623 if (read(child_ready_pipe[0], &buf, 1) == -1) {
624 perror("unable to read pipe");
625 exit(-1);
626 }
627 close(child_ready_pipe[0]);
628 }
629
630 nr_cpus = read_cpu_map(cpu_list);
631 if (nr_cpus < 1) {
632 perror("failed to collect number of CPUs\n");
633 return -1;
634 }
635
636 if (!system_wide && no_inherit && !cpu_list) {
637 open_counters(-1);
638 } else {
639 for (i = 0; i < nr_cpus; i++)
640 open_counters(cpumap[i]);
641 }
642
643 if (pipe_output) {
644 err = perf_header__write_pipe(output);
645 if (err < 0)
646 return err;
647 } else if (file_new) {
648 err = perf_header__write(&session->header, output, false);
649 if (err < 0)
650 return err;
651 }
652
653 post_processing_offset = lseek(output, 0, SEEK_CUR);
654
655 if (pipe_output) {
656 err = event__synthesize_attrs(&session->header,
657 process_synthesized_event,
658 session);
659 if (err < 0) {
660 pr_err("Couldn't synthesize attrs.\n");
661 return err;
662 }
663
664 err = event__synthesize_event_types(process_synthesized_event,
665 session);
666 if (err < 0) {
667 pr_err("Couldn't synthesize event_types.\n");
668 return err;
669 }
670
671 if (have_tracepoints(attrs, nr_counters)) {
672 /*
673 * FIXME err <= 0 here actually means that
674 * there were no tracepoints so its not really
675 * an error, just that we don't need to
676 * synthesize anything. We really have to
677 * return this more properly and also
678 * propagate errors that now are calling die()
679 */
680 err = event__synthesize_tracing_data(output, attrs,
681 nr_counters,
682 process_synthesized_event,
683 session);
684 if (err <= 0) {
685 pr_err("Couldn't record tracing data.\n");
686 return err;
687 }
688 advance_output(err);
689 }
690 }
691
692 machine = perf_session__find_host_machine(session);
693 if (!machine) {
694 pr_err("Couldn't find native kernel information.\n");
695 return -1;
696 }
697
698 err = event__synthesize_kernel_mmap(process_synthesized_event,
699 session, machine, "_text");
700 if (err < 0)
701 err = event__synthesize_kernel_mmap(process_synthesized_event,
702 session, machine, "_stext");
703 if (err < 0) {
704 pr_err("Couldn't record kernel reference relocation symbol.\n");
705 return err;
706 }
707
708 err = event__synthesize_modules(process_synthesized_event,
709 session, machine);
710 if (err < 0) {
711 pr_err("Couldn't record kernel reference relocation symbol.\n");
712 return err;
713 }
714 if (perf_guest)
715 perf_session__process_machines(session, event__synthesize_guest_os);
716
717 if (!system_wide && cpu_list)
718 event__synthesize_thread(target_tid, process_synthesized_event,
719 session);
720 else
721 event__synthesize_threads(process_synthesized_event, session);
722
723 if (realtime_prio) {
724 struct sched_param param;
725
726 param.sched_priority = realtime_prio;
727 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
728 pr_err("Could not set realtime priority.\n");
729 exit(-1);
730 }
731 }
732
733 /*
734 * Let the child rip
735 */
736 if (forks)
737 close(go_pipe[1]);
738
739 for (;;) {
740 int hits = samples;
741 int thread;
742
743 mmap_read_all();
744
745 if (hits == samples) {
746 if (done)
747 break;
748 err = poll(event_array, nr_poll, -1);
749 waking++;
750 }
751
752 if (done) {
753 for (i = 0; i < nr_cpu; i++) {
754 for (counter = 0;
755 counter < nr_counters;
756 counter++) {
757 for (thread = 0;
758 thread < thread_num;
759 thread++)
760 ioctl(fd[i][counter][thread],
761 PERF_EVENT_IOC_DISABLE);
762 }
763 }
764 }
765 }
766
767 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
768
769 /*
770 * Approximate RIP event size: 24 bytes.
771 */
772 fprintf(stderr,
773 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
774 (double)bytes_written / 1024.0 / 1024.0,
775 output_name,
776 bytes_written / 24);
777
778 return 0;
779 }
780
781 static const char * const record_usage[] = {
782 "perf record [<options>] [<command>]",
783 "perf record [<options>] -- <command> [<options>]",
784 NULL
785 };
786
787 static bool force, append_file;
788
789 static const struct option options[] = {
790 OPT_CALLBACK('e', "event", NULL, "event",
791 "event selector. use 'perf list' to list available events",
792 parse_events),
793 OPT_CALLBACK(0, "filter", NULL, "filter",
794 "event filter", parse_filter),
795 OPT_INTEGER('p', "pid", &target_pid,
796 "record events on existing process id"),
797 OPT_INTEGER('t', "tid", &target_tid,
798 "record events on existing thread id"),
799 OPT_INTEGER('r', "realtime", &realtime_prio,
800 "collect data with this RT SCHED_FIFO priority"),
801 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
802 "collect raw sample records from all opened counters"),
803 OPT_BOOLEAN('a', "all-cpus", &system_wide,
804 "system-wide collection from all CPUs"),
805 OPT_BOOLEAN('A', "append", &append_file,
806 "append to the output file to do incremental profiling"),
807 OPT_STRING('C', "cpu", &cpu_list, "cpu",
808 "list of cpus to monitor"),
809 OPT_BOOLEAN('f', "force", &force,
810 "overwrite existing data file (deprecated)"),
811 OPT_U64('c', "count", &user_interval, "event period to sample"),
812 OPT_STRING('o', "output", &output_name, "file",
813 "output file name"),
814 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
815 "child tasks do not inherit counters"),
816 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
817 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
818 OPT_BOOLEAN('g', "call-graph", &call_graph,
819 "do call-graph (stack chain/backtrace) recording"),
820 OPT_INCR('v', "verbose", &verbose,
821 "be more verbose (show counter open errors, etc)"),
822 OPT_BOOLEAN('s', "stat", &inherit_stat,
823 "per thread counts"),
824 OPT_BOOLEAN('d', "data", &sample_address,
825 "Sample addresses"),
826 OPT_BOOLEAN('n', "no-samples", &no_samples,
827 "don't sample"),
828 OPT_END()
829 };
830
831 int cmd_record(int argc, const char **argv, const char *prefix __used)
832 {
833 int i,j;
834
835 argc = parse_options(argc, argv, options, record_usage,
836 PARSE_OPT_STOP_AT_NON_OPTION);
837 if (!argc && target_pid == -1 && target_tid == -1 &&
838 !system_wide && !cpu_list)
839 usage_with_options(record_usage, options);
840
841 if (force && append_file) {
842 fprintf(stderr, "Can't overwrite and append at the same time."
843 " You need to choose between -f and -A");
844 usage_with_options(record_usage, options);
845 } else if (append_file) {
846 write_mode = WRITE_APPEND;
847 } else {
848 write_mode = WRITE_FORCE;
849 }
850
851 symbol__init();
852
853 if (!nr_counters) {
854 nr_counters = 1;
855 attrs[0].type = PERF_TYPE_HARDWARE;
856 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
857 }
858
859 if (target_pid != -1) {
860 target_tid = target_pid;
861 thread_num = find_all_tid(target_pid, &all_tids);
862 if (thread_num <= 0) {
863 fprintf(stderr, "Can't find all threads of pid %d\n",
864 target_pid);
865 usage_with_options(record_usage, options);
866 }
867 } else {
868 all_tids=malloc(sizeof(pid_t));
869 if (!all_tids)
870 return -ENOMEM;
871
872 all_tids[0] = target_tid;
873 thread_num = 1;
874 }
875
876 for (i = 0; i < MAX_NR_CPUS; i++) {
877 for (j = 0; j < MAX_COUNTERS; j++) {
878 fd[i][j] = malloc(sizeof(int)*thread_num);
879 if (!fd[i][j])
880 return -ENOMEM;
881 }
882 }
883 event_array = malloc(
884 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
885 if (!event_array)
886 return -ENOMEM;
887
888 if (user_interval != ULLONG_MAX)
889 default_interval = user_interval;
890 if (user_freq != UINT_MAX)
891 freq = user_freq;
892
893 /*
894 * User specified count overrides default frequency.
895 */
896 if (default_interval)
897 freq = 0;
898 else if (freq) {
899 default_interval = freq;
900 } else {
901 fprintf(stderr, "frequency and count are zero, aborting\n");
902 exit(EXIT_FAILURE);
903 }
904
905 return __cmd_record(argc, argv);
906 }
Linux kernel - Deliverables
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