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perf tools: Add the ability to specify list of cpus to monitor
[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
274 if (call_graph)
275 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
276
277 if (raw_samples) {
278 attr->sample_type |= PERF_SAMPLE_TIME;
279 attr->sample_type |= PERF_SAMPLE_RAW;
280 attr->sample_type |= PERF_SAMPLE_CPU;
281 }
282
283 attr->mmap = track;
284 attr->comm = track;
285 attr->inherit = !no_inherit;
286 if (target_pid == -1 && target_tid == -1 && !system_wide) {
287 attr->disabled = 1;
288 attr->enable_on_exec = 1;
289 }
290
291 for (thread_index = 0; thread_index < thread_num; thread_index++) {
292 try_again:
293 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
294 all_tids[thread_index], cpu, group_fd, 0);
295
296 if (fd[nr_cpu][counter][thread_index] < 0) {
297 int err = errno;
298
299 if (err == EPERM || err == EACCES)
300 die("Permission error - are you root?\n"
301 "\t Consider tweaking"
302 " /proc/sys/kernel/perf_event_paranoid.\n");
303 else if (err == ENODEV && cpu_list) {
304 die("No such device - did you specify"
305 " an out-of-range profile CPU?\n");
306 }
307
308 /*
309 * If it's cycles then fall back to hrtimer
310 * based cpu-clock-tick sw counter, which
311 * is always available even if no PMU support:
312 */
313 if (attr->type == PERF_TYPE_HARDWARE
314 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
315
316 if (verbose)
317 warning(" ... trying to fall back to cpu-clock-ticks\n");
318 attr->type = PERF_TYPE_SOFTWARE;
319 attr->config = PERF_COUNT_SW_CPU_CLOCK;
320 goto try_again;
321 }
322 printf("\n");
323 error("perfcounter syscall returned with %d (%s)\n",
324 fd[nr_cpu][counter][thread_index], strerror(err));
325
326 #if defined(__i386__) || defined(__x86_64__)
327 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
328 die("No hardware sampling interrupt available."
329 " No APIC? If so then you can boot the kernel"
330 " with the \"lapic\" boot parameter to"
331 " force-enable it.\n");
332 #endif
333
334 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
335 exit(-1);
336 }
337
338 h_attr = get_header_attr(attr, counter);
339 if (h_attr == NULL)
340 die("nomem\n");
341
342 if (!file_new) {
343 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
344 fprintf(stderr, "incompatible append\n");
345 exit(-1);
346 }
347 }
348
349 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
350 perror("Unable to read perf file descriptor\n");
351 exit(-1);
352 }
353
354 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
355 pr_warning("Not enough memory to add id\n");
356 exit(-1);
357 }
358
359 assert(fd[nr_cpu][counter][thread_index] >= 0);
360 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
361
362 /*
363 * First counter acts as the group leader:
364 */
365 if (group && group_fd == -1)
366 group_fd = fd[nr_cpu][counter][thread_index];
367
368 if (counter || thread_index) {
369 ret = ioctl(fd[nr_cpu][counter][thread_index],
370 PERF_EVENT_IOC_SET_OUTPUT,
371 fd[nr_cpu][0][0]);
372 if (ret) {
373 error("failed to set output: %d (%s)\n", errno,
374 strerror(errno));
375 exit(-1);
376 }
377 } else {
378 mmap_array[nr_cpu].counter = counter;
379 mmap_array[nr_cpu].prev = 0;
380 mmap_array[nr_cpu].mask = mmap_pages*page_size - 1;
381 mmap_array[nr_cpu].base = mmap(NULL, (mmap_pages+1)*page_size,
382 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
383 if (mmap_array[nr_cpu].base == MAP_FAILED) {
384 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
385 exit(-1);
386 }
387
388 event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
389 event_array[nr_poll].events = POLLIN;
390 nr_poll++;
391 }
392
393 if (filter != NULL) {
394 ret = ioctl(fd[nr_cpu][counter][thread_index],
395 PERF_EVENT_IOC_SET_FILTER, filter);
396 if (ret) {
397 error("failed to set filter with %d (%s)\n", errno,
398 strerror(errno));
399 exit(-1);
400 }
401 }
402 }
403 }
404
405 static void open_counters(int cpu)
406 {
407 int counter;
408
409 group_fd = -1;
410 for (counter = 0; counter < nr_counters; counter++)
411 create_counter(counter, cpu);
412
413 nr_cpu++;
414 }
415
416 static int process_buildids(void)
417 {
418 u64 size = lseek(output, 0, SEEK_CUR);
419
420 if (size == 0)
421 return 0;
422
423 session->fd = output;
424 return __perf_session__process_events(session, post_processing_offset,
425 size - post_processing_offset,
426 size, &build_id__mark_dso_hit_ops);
427 }
428
429 static void atexit_header(void)
430 {
431 if (!pipe_output) {
432 session->header.data_size += bytes_written;
433
434 process_buildids();
435 perf_header__write(&session->header, output, true);
436 }
437 }
438
439 static void event__synthesize_guest_os(struct machine *machine, void *data)
440 {
441 int err;
442 char *guest_kallsyms;
443 char path[PATH_MAX];
444 struct perf_session *psession = data;
445
446 if (machine__is_host(machine))
447 return;
448
449 /*
450 *As for guest kernel when processing subcommand record&report,
451 *we arrange module mmap prior to guest kernel mmap and trigger
452 *a preload dso because default guest module symbols are loaded
453 *from guest kallsyms instead of /lib/modules/XXX/XXX. This
454 *method is used to avoid symbol missing when the first addr is
455 *in module instead of in guest kernel.
456 */
457 err = event__synthesize_modules(process_synthesized_event,
458 psession, machine);
459 if (err < 0)
460 pr_err("Couldn't record guest kernel [%d]'s reference"
461 " relocation symbol.\n", machine->pid);
462
463 if (machine__is_default_guest(machine))
464 guest_kallsyms = (char *) symbol_conf.default_guest_kallsyms;
465 else {
466 sprintf(path, "%s/proc/kallsyms", machine->root_dir);
467 guest_kallsyms = path;
468 }
469
470 /*
471 * We use _stext for guest kernel because guest kernel's /proc/kallsyms
472 * have no _text sometimes.
473 */
474 err = event__synthesize_kernel_mmap(process_synthesized_event,
475 psession, machine, "_text");
476 if (err < 0)
477 err = event__synthesize_kernel_mmap(process_synthesized_event,
478 psession, machine, "_stext");
479 if (err < 0)
480 pr_err("Couldn't record guest kernel [%d]'s reference"
481 " relocation symbol.\n", machine->pid);
482 }
483
484 static struct perf_event_header finished_round_event = {
485 .size = sizeof(struct perf_event_header),
486 .type = PERF_RECORD_FINISHED_ROUND,
487 };
488
489 static void mmap_read_all(void)
490 {
491 int i;
492
493 for (i = 0; i < nr_cpu; i++) {
494 if (mmap_array[i].base)
495 mmap_read(&mmap_array[i]);
496 }
497
498 if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
499 write_output(&finished_round_event, sizeof(finished_round_event));
500 }
501
502 static int __cmd_record(int argc, const char **argv)
503 {
504 int i, counter;
505 struct stat st;
506 int flags;
507 int err;
508 unsigned long waking = 0;
509 int child_ready_pipe[2], go_pipe[2];
510 const bool forks = argc > 0;
511 char buf;
512 struct machine *machine;
513
514 page_size = sysconf(_SC_PAGE_SIZE);
515
516 atexit(sig_atexit);
517 signal(SIGCHLD, sig_handler);
518 signal(SIGINT, sig_handler);
519
520 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
521 perror("failed to create pipes");
522 exit(-1);
523 }
524
525 if (!strcmp(output_name, "-"))
526 pipe_output = 1;
527 else if (!stat(output_name, &st) && st.st_size) {
528 if (write_mode == WRITE_FORCE) {
529 char oldname[PATH_MAX];
530 snprintf(oldname, sizeof(oldname), "%s.old",
531 output_name);
532 unlink(oldname);
533 rename(output_name, oldname);
534 }
535 } else if (write_mode == WRITE_APPEND) {
536 write_mode = WRITE_FORCE;
537 }
538
539 flags = O_CREAT|O_RDWR;
540 if (write_mode == WRITE_APPEND)
541 file_new = 0;
542 else
543 flags |= O_TRUNC;
544
545 if (pipe_output)
546 output = STDOUT_FILENO;
547 else
548 output = open(output_name, flags, S_IRUSR | S_IWUSR);
549 if (output < 0) {
550 perror("failed to create output file");
551 exit(-1);
552 }
553
554 session = perf_session__new(output_name, O_WRONLY,
555 write_mode == WRITE_FORCE, false);
556 if (session == NULL) {
557 pr_err("Not enough memory for reading perf file header\n");
558 return -1;
559 }
560
561 if (!file_new) {
562 err = perf_header__read(session, output);
563 if (err < 0)
564 return err;
565 }
566
567 if (have_tracepoints(attrs, nr_counters))
568 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
569
570 atexit(atexit_header);
571
572 if (forks) {
573 child_pid = fork();
574 if (child_pid < 0) {
575 perror("failed to fork");
576 exit(-1);
577 }
578
579 if (!child_pid) {
580 if (pipe_output)
581 dup2(2, 1);
582 close(child_ready_pipe[0]);
583 close(go_pipe[1]);
584 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
585
586 /*
587 * Do a dummy execvp to get the PLT entry resolved,
588 * so we avoid the resolver overhead on the real
589 * execvp call.
590 */
591 execvp("", (char **)argv);
592
593 /*
594 * Tell the parent we're ready to go
595 */
596 close(child_ready_pipe[1]);
597
598 /*
599 * Wait until the parent tells us to go.
600 */
601 if (read(go_pipe[0], &buf, 1) == -1)
602 perror("unable to read pipe");
603
604 execvp(argv[0], (char **)argv);
605
606 perror(argv[0]);
607 exit(-1);
608 }
609
610 if (!system_wide && target_tid == -1 && target_pid == -1)
611 all_tids[0] = child_pid;
612
613 close(child_ready_pipe[1]);
614 close(go_pipe[0]);
615 /*
616 * wait for child to settle
617 */
618 if (read(child_ready_pipe[0], &buf, 1) == -1) {
619 perror("unable to read pipe");
620 exit(-1);
621 }
622 close(child_ready_pipe[0]);
623 }
624
625 nr_cpus = read_cpu_map(cpu_list);
626 if (nr_cpus < 1) {
627 perror("failed to collect number of CPUs\n");
628 return -1;
629 }
630
631 if (!system_wide && no_inherit && !cpu_list) {
632 open_counters(-1);
633 } else {
634 for (i = 0; i < nr_cpus; i++)
635 open_counters(cpumap[i]);
636 }
637
638 if (pipe_output) {
639 err = perf_header__write_pipe(output);
640 if (err < 0)
641 return err;
642 } else if (file_new) {
643 err = perf_header__write(&session->header, output, false);
644 if (err < 0)
645 return err;
646 }
647
648 post_processing_offset = lseek(output, 0, SEEK_CUR);
649
650 if (pipe_output) {
651 err = event__synthesize_attrs(&session->header,
652 process_synthesized_event,
653 session);
654 if (err < 0) {
655 pr_err("Couldn't synthesize attrs.\n");
656 return err;
657 }
658
659 err = event__synthesize_event_types(process_synthesized_event,
660 session);
661 if (err < 0) {
662 pr_err("Couldn't synthesize event_types.\n");
663 return err;
664 }
665
666 if (have_tracepoints(attrs, nr_counters)) {
667 /*
668 * FIXME err <= 0 here actually means that
669 * there were no tracepoints so its not really
670 * an error, just that we don't need to
671 * synthesize anything. We really have to
672 * return this more properly and also
673 * propagate errors that now are calling die()
674 */
675 err = event__synthesize_tracing_data(output, attrs,
676 nr_counters,
677 process_synthesized_event,
678 session);
679 if (err <= 0) {
680 pr_err("Couldn't record tracing data.\n");
681 return err;
682 }
683 advance_output(err);
684 }
685 }
686
687 machine = perf_session__find_host_machine(session);
688 if (!machine) {
689 pr_err("Couldn't find native kernel information.\n");
690 return -1;
691 }
692
693 err = event__synthesize_kernel_mmap(process_synthesized_event,
694 session, machine, "_text");
695 if (err < 0)
696 err = event__synthesize_kernel_mmap(process_synthesized_event,
697 session, machine, "_stext");
698 if (err < 0) {
699 pr_err("Couldn't record kernel reference relocation symbol.\n");
700 return err;
701 }
702
703 err = event__synthesize_modules(process_synthesized_event,
704 session, machine);
705 if (err < 0) {
706 pr_err("Couldn't record kernel reference relocation symbol.\n");
707 return err;
708 }
709 if (perf_guest)
710 perf_session__process_machines(session, event__synthesize_guest_os);
711
712 if (!system_wide && cpu_list)
713 event__synthesize_thread(target_tid, process_synthesized_event,
714 session);
715 else
716 event__synthesize_threads(process_synthesized_event, session);
717
718 if (realtime_prio) {
719 struct sched_param param;
720
721 param.sched_priority = realtime_prio;
722 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
723 pr_err("Could not set realtime priority.\n");
724 exit(-1);
725 }
726 }
727
728 /*
729 * Let the child rip
730 */
731 if (forks)
732 close(go_pipe[1]);
733
734 for (;;) {
735 int hits = samples;
736 int thread;
737
738 mmap_read_all();
739
740 if (hits == samples) {
741 if (done)
742 break;
743 err = poll(event_array, nr_poll, -1);
744 waking++;
745 }
746
747 if (done) {
748 for (i = 0; i < nr_cpu; i++) {
749 for (counter = 0;
750 counter < nr_counters;
751 counter++) {
752 for (thread = 0;
753 thread < thread_num;
754 thread++)
755 ioctl(fd[i][counter][thread],
756 PERF_EVENT_IOC_DISABLE);
757 }
758 }
759 }
760 }
761
762 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
763
764 /*
765 * Approximate RIP event size: 24 bytes.
766 */
767 fprintf(stderr,
768 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
769 (double)bytes_written / 1024.0 / 1024.0,
770 output_name,
771 bytes_written / 24);
772
773 return 0;
774 }
775
776 static const char * const record_usage[] = {
777 "perf record [<options>] [<command>]",
778 "perf record [<options>] -- <command> [<options>]",
779 NULL
780 };
781
782 static bool force, append_file;
783
784 static const struct option options[] = {
785 OPT_CALLBACK('e', "event", NULL, "event",
786 "event selector. use 'perf list' to list available events",
787 parse_events),
788 OPT_CALLBACK(0, "filter", NULL, "filter",
789 "event filter", parse_filter),
790 OPT_INTEGER('p', "pid", &target_pid,
791 "record events on existing process id"),
792 OPT_INTEGER('t', "tid", &target_tid,
793 "record events on existing thread id"),
794 OPT_INTEGER('r', "realtime", &realtime_prio,
795 "collect data with this RT SCHED_FIFO priority"),
796 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
797 "collect raw sample records from all opened counters"),
798 OPT_BOOLEAN('a', "all-cpus", &system_wide,
799 "system-wide collection from all CPUs"),
800 OPT_BOOLEAN('A', "append", &append_file,
801 "append to the output file to do incremental profiling"),
802 OPT_STRING('C', "cpu", &cpu_list, "cpu",
803 "list of cpus to monitor"),
804 OPT_BOOLEAN('f', "force", &force,
805 "overwrite existing data file (deprecated)"),
806 OPT_U64('c', "count", &user_interval, "event period to sample"),
807 OPT_STRING('o', "output", &output_name, "file",
808 "output file name"),
809 OPT_BOOLEAN('i', "no-inherit", &no_inherit,
810 "child tasks do not inherit counters"),
811 OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
812 OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
813 OPT_BOOLEAN('g', "call-graph", &call_graph,
814 "do call-graph (stack chain/backtrace) recording"),
815 OPT_INCR('v', "verbose", &verbose,
816 "be more verbose (show counter open errors, etc)"),
817 OPT_BOOLEAN('s', "stat", &inherit_stat,
818 "per thread counts"),
819 OPT_BOOLEAN('d', "data", &sample_address,
820 "Sample addresses"),
821 OPT_BOOLEAN('n', "no-samples", &no_samples,
822 "don't sample"),
823 OPT_END()
824 };
825
826 int cmd_record(int argc, const char **argv, const char *prefix __used)
827 {
828 int i,j;
829
830 argc = parse_options(argc, argv, options, record_usage,
831 PARSE_OPT_STOP_AT_NON_OPTION);
832 if (!argc && target_pid == -1 && target_tid == -1 &&
833 !system_wide && !cpu_list)
834 usage_with_options(record_usage, options);
835
836 if (force && append_file) {
837 fprintf(stderr, "Can't overwrite and append at the same time."
838 " You need to choose between -f and -A");
839 usage_with_options(record_usage, options);
840 } else if (append_file) {
841 write_mode = WRITE_APPEND;
842 } else {
843 write_mode = WRITE_FORCE;
844 }
845
846 symbol__init();
847
848 if (!nr_counters) {
849 nr_counters = 1;
850 attrs[0].type = PERF_TYPE_HARDWARE;
851 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
852 }
853
854 if (target_pid != -1) {
855 target_tid = target_pid;
856 thread_num = find_all_tid(target_pid, &all_tids);
857 if (thread_num <= 0) {
858 fprintf(stderr, "Can't find all threads of pid %d\n",
859 target_pid);
860 usage_with_options(record_usage, options);
861 }
862 } else {
863 all_tids=malloc(sizeof(pid_t));
864 if (!all_tids)
865 return -ENOMEM;
866
867 all_tids[0] = target_tid;
868 thread_num = 1;
869 }
870
871 for (i = 0; i < MAX_NR_CPUS; i++) {
872 for (j = 0; j < MAX_COUNTERS; j++) {
873 fd[i][j] = malloc(sizeof(int)*thread_num);
874 if (!fd[i][j])
875 return -ENOMEM;
876 }
877 }
878 event_array = malloc(
879 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
880 if (!event_array)
881 return -ENOMEM;
882
883 if (user_interval != ULLONG_MAX)
884 default_interval = user_interval;
885 if (user_freq != UINT_MAX)
886 freq = user_freq;
887
888 /*
889 * User specified count overrides default frequency.
890 */
891 if (default_interval)
892 freq = 0;
893 else if (freq) {
894 default_interval = freq;
895 } else {
896 fprintf(stderr, "frequency and count are zero, aborting\n");
897 exit(EXIT_FAILURE);
898 }
899
900 return __cmd_record(argc, argv);
901 }
Linux kernel - Deliverables
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