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perf: Make the trace events sample period default to 1
[linux-2.6/x86.git] / tools / perf / builtin-record.c
blobca2affc9233f92a047a97fdc6d3e0390a766a3fa
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 unsigned int user_interval = UINT_MAX;
37 static long 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 const char *output_name = "perf.data";
46 static int group = 0;
47 static unsigned int realtime_prio = 0;
48 static bool raw_samples = false;
49 static bool system_wide = false;
50 static int profile_cpu = -1;
51 static pid_t target_pid = -1;
52 static pid_t target_tid = -1;
53 static pid_t *all_tids = NULL;
54 static int thread_num = 0;
55 static pid_t child_pid = -1;
56 static bool inherit = true;
57 static enum write_mode_t write_mode = WRITE_FORCE;
58 static bool call_graph = false;
59 static bool inherit_stat = false;
60 static bool no_samples = false;
61 static bool sample_address = false;
62 static bool multiplex = false;
63 static int multiplex_fd = -1;
64
65 static long samples = 0;
66 static struct timeval last_read;
67 static struct timeval this_read;
68
69 static u64 bytes_written = 0;
70
71 static struct pollfd *event_array;
72
73 static int nr_poll = 0;
74 static int nr_cpu = 0;
75
76 static int file_new = 1;
77 static off_t post_processing_offset;
78
79 static struct perf_session *session;
80
81 struct mmap_data {
82 int counter;
83 void *base;
84 unsigned int mask;
85 unsigned int prev;
86 };
87
88 static struct mmap_data *mmap_array[MAX_NR_CPUS][MAX_COUNTERS];
89
90 static unsigned long mmap_read_head(struct mmap_data *md)
91 {
92 struct perf_event_mmap_page *pc = md->base;
93 long head;
94
95 head = pc->data_head;
96 rmb();
97
98 return head;
99 }
100
101 static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
102 {
103 struct perf_event_mmap_page *pc = md->base;
104
105 /*
106 * ensure all reads are done before we write the tail out.
107 */
108 /* mb(); */
109 pc->data_tail = tail;
110 }
111
112 static void write_output(void *buf, size_t size)
113 {
114 while (size) {
115 int ret = write(output, buf, size);
116
117 if (ret < 0)
118 die("failed to write");
119
120 size -= ret;
121 buf += ret;
122
123 bytes_written += ret;
124 }
125 }
126
127 static int process_synthesized_event(event_t *event,
128 struct perf_session *self __used)
129 {
130 write_output(event, event->header.size);
131 return 0;
132 }
133
134 static void mmap_read(struct mmap_data *md)
135 {
136 unsigned int head = mmap_read_head(md);
137 unsigned int old = md->prev;
138 unsigned char *data = md->base + page_size;
139 unsigned long size;
140 void *buf;
141 int diff;
142
143 gettimeofday(&this_read, NULL);
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 struct timeval iv;
156 unsigned long msecs;
157
158 timersub(&this_read, &last_read, &iv);
159 msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
160
161 fprintf(stderr, "WARNING: failed to keep up with mmap data."
162 " Last read %lu msecs ago.\n", msecs);
163
164 /*
165 * head points to a known good entry, start there.
166 */
167 old = head;
168 }
169
170 last_read = this_read;
171
172 if (old != head)
173 samples++;
174
175 size = head - old;
176
177 if ((old & md->mask) + size != (head & md->mask)) {
178 buf = &data[old & md->mask];
179 size = md->mask + 1 - (old & md->mask);
180 old += size;
181
182 write_output(buf, size);
183 }
184
185 buf = &data[old & md->mask];
186 size = head - old;
187 old += size;
188
189 write_output(buf, size);
190
191 md->prev = old;
192 mmap_write_tail(md, old);
193 }
194
195 static volatile int done = 0;
196 static volatile int signr = -1;
197
198 static void sig_handler(int sig)
199 {
200 done = 1;
201 signr = sig;
202 }
203
204 static void sig_atexit(void)
205 {
206 if (child_pid != -1)
207 kill(child_pid, SIGTERM);
208
209 if (signr == -1)
210 return;
211
212 signal(signr, SIG_DFL);
213 kill(getpid(), signr);
214 }
215
216 static int group_fd;
217
218 static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int nr)
219 {
220 struct perf_header_attr *h_attr;
221
222 if (nr < session->header.attrs) {
223 h_attr = session->header.attr[nr];
224 } else {
225 h_attr = perf_header_attr__new(a);
226 if (h_attr != NULL)
227 if (perf_header__add_attr(&session->header, h_attr) < 0) {
228 perf_header_attr__delete(h_attr);
229 h_attr = NULL;
230 }
231 }
232
233 return h_attr;
234 }
235
236 static void create_counter(int counter, int cpu)
237 {
238 char *filter = filters[counter];
239 struct perf_event_attr *attr = attrs + counter;
240 struct perf_header_attr *h_attr;
241 int track = !counter; /* only the first counter needs these */
242 int thread_index;
243 int ret;
244 struct {
245 u64 count;
246 u64 time_enabled;
247 u64 time_running;
248 u64 id;
249 } read_data;
250
251 attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
252 PERF_FORMAT_TOTAL_TIME_RUNNING |
253 PERF_FORMAT_ID;
254
255 attr->sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
256
257 if (nr_counters > 1)
258 attr->sample_type |= PERF_SAMPLE_ID;
259
260 /*
261 * We default some events to a 1 default interval. But keep
262 * it a weak assumption overridable by the user.
263 */
264 if (!attr->sample_period || (user_freq != UINT_MAX &&
265 user_interval != UINT_MAX)) {
266 if (freq) {
267 attr->sample_type |= PERF_SAMPLE_PERIOD;
268 attr->freq = 1;
269 attr->sample_freq = freq;
270 } else {
271 attr->sample_period = default_interval;
272 }
273 }
274
275 if (no_samples)
276 attr->sample_freq = 0;
277
278 if (inherit_stat)
279 attr->inherit_stat = 1;
280
281 if (sample_address)
282 attr->sample_type |= PERF_SAMPLE_ADDR;
283
284 if (call_graph)
285 attr->sample_type |= PERF_SAMPLE_CALLCHAIN;
286
287 if (raw_samples) {
288 attr->sample_type |= PERF_SAMPLE_TIME;
289 attr->sample_type |= PERF_SAMPLE_RAW;
290 attr->sample_type |= PERF_SAMPLE_CPU;
291 }
292
293 attr->mmap = track;
294 attr->comm = track;
295 attr->inherit = inherit;
296 if (target_pid == -1 && !system_wide) {
297 attr->disabled = 1;
298 attr->enable_on_exec = 1;
299 }
300
301 for (thread_index = 0; thread_index < thread_num; thread_index++) {
302 try_again:
303 fd[nr_cpu][counter][thread_index] = sys_perf_event_open(attr,
304 all_tids[thread_index], cpu, group_fd, 0);
305
306 if (fd[nr_cpu][counter][thread_index] < 0) {
307 int err = errno;
308
309 if (err == EPERM || err == EACCES)
310 die("Permission error - are you root?\n"
311 "\t Consider tweaking"
312 " /proc/sys/kernel/perf_event_paranoid.\n");
313 else if (err == ENODEV && profile_cpu != -1) {
314 die("No such device - did you specify"
315 " an out-of-range profile CPU?\n");
316 }
317
318 /*
319 * If it's cycles then fall back to hrtimer
320 * based cpu-clock-tick sw counter, which
321 * is always available even if no PMU support:
322 */
323 if (attr->type == PERF_TYPE_HARDWARE
324 && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
325
326 if (verbose)
327 warning(" ... trying to fall back to cpu-clock-ticks\n");
328 attr->type = PERF_TYPE_SOFTWARE;
329 attr->config = PERF_COUNT_SW_CPU_CLOCK;
330 goto try_again;
331 }
332 printf("\n");
333 error("perfcounter syscall returned with %d (%s)\n",
334 fd[nr_cpu][counter][thread_index], strerror(err));
335
336 #if defined(__i386__) || defined(__x86_64__)
337 if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
338 die("No hardware sampling interrupt available."
339 " No APIC? If so then you can boot the kernel"
340 " with the \"lapic\" boot parameter to"
341 " force-enable it.\n");
342 #endif
343
344 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
345 exit(-1);
346 }
347
348 h_attr = get_header_attr(attr, counter);
349 if (h_attr == NULL)
350 die("nomem\n");
351
352 if (!file_new) {
353 if (memcmp(&h_attr->attr, attr, sizeof(*attr))) {
354 fprintf(stderr, "incompatible append\n");
355 exit(-1);
356 }
357 }
358
359 if (read(fd[nr_cpu][counter][thread_index], &read_data, sizeof(read_data)) == -1) {
360 perror("Unable to read perf file descriptor\n");
361 exit(-1);
362 }
363
364 if (perf_header_attr__add_id(h_attr, read_data.id) < 0) {
365 pr_warning("Not enough memory to add id\n");
366 exit(-1);
367 }
368
369 assert(fd[nr_cpu][counter][thread_index] >= 0);
370 fcntl(fd[nr_cpu][counter][thread_index], F_SETFL, O_NONBLOCK);
371
372 /*
373 * First counter acts as the group leader:
374 */
375 if (group && group_fd == -1)
376 group_fd = fd[nr_cpu][counter][thread_index];
377 if (multiplex && multiplex_fd == -1)
378 multiplex_fd = fd[nr_cpu][counter][thread_index];
379
380 if (multiplex && fd[nr_cpu][counter][thread_index] != multiplex_fd) {
381
382 ret = ioctl(fd[nr_cpu][counter][thread_index], PERF_EVENT_IOC_SET_OUTPUT, multiplex_fd);
383 assert(ret != -1);
384 } else {
385 event_array[nr_poll].fd = fd[nr_cpu][counter][thread_index];
386 event_array[nr_poll].events = POLLIN;
387 nr_poll++;
388
389 mmap_array[nr_cpu][counter][thread_index].counter = counter;
390 mmap_array[nr_cpu][counter][thread_index].prev = 0;
391 mmap_array[nr_cpu][counter][thread_index].mask = mmap_pages*page_size - 1;
392 mmap_array[nr_cpu][counter][thread_index].base = mmap(NULL, (mmap_pages+1)*page_size,
393 PROT_READ|PROT_WRITE, MAP_SHARED, fd[nr_cpu][counter][thread_index], 0);
394 if (mmap_array[nr_cpu][counter][thread_index].base == MAP_FAILED) {
395 error("failed to mmap with %d (%s)\n", errno, strerror(errno));
396 exit(-1);
397 }
398 }
399
400 if (filter != NULL) {
401 ret = ioctl(fd[nr_cpu][counter][thread_index],
402 PERF_EVENT_IOC_SET_FILTER, filter);
403 if (ret) {
404 error("failed to set filter with %d (%s)\n", errno,
405 strerror(errno));
406 exit(-1);
407 }
408 }
409 }
410 }
411
412 static void open_counters(int cpu)
413 {
414 int counter;
415
416 group_fd = -1;
417 for (counter = 0; counter < nr_counters; counter++)
418 create_counter(counter, cpu);
419
420 nr_cpu++;
421 }
422
423 static int process_buildids(void)
424 {
425 u64 size = lseek(output, 0, SEEK_CUR);
426
427 if (size == 0)
428 return 0;
429
430 session->fd = output;
431 return __perf_session__process_events(session, post_processing_offset,
432 size - post_processing_offset,
433 size, &build_id__mark_dso_hit_ops);
434 }
435
436 static void atexit_header(void)
437 {
438 session->header.data_size += bytes_written;
439
440 process_buildids();
441 perf_header__write(&session->header, output, true);
442 }
443
444 static int __cmd_record(int argc, const char **argv)
445 {
446 int i, counter;
447 struct stat st;
448 pid_t pid = 0;
449 int flags;
450 int err;
451 unsigned long waking = 0;
452 int child_ready_pipe[2], go_pipe[2];
453 const bool forks = argc > 0;
454 char buf;
455
456 page_size = sysconf(_SC_PAGE_SIZE);
457
458 atexit(sig_atexit);
459 signal(SIGCHLD, sig_handler);
460 signal(SIGINT, sig_handler);
461
462 if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
463 perror("failed to create pipes");
464 exit(-1);
465 }
466
467 if (!stat(output_name, &st) && st.st_size) {
468 if (write_mode == WRITE_FORCE) {
469 char oldname[PATH_MAX];
470 snprintf(oldname, sizeof(oldname), "%s.old",
471 output_name);
472 unlink(oldname);
473 rename(output_name, oldname);
474 }
475 } else if (write_mode == WRITE_APPEND) {
476 write_mode = WRITE_FORCE;
477 }
478
479 flags = O_CREAT|O_RDWR;
480 if (write_mode == WRITE_APPEND)
481 file_new = 0;
482 else
483 flags |= O_TRUNC;
484
485 output = open(output_name, flags, S_IRUSR|S_IWUSR);
486 if (output < 0) {
487 perror("failed to create output file");
488 exit(-1);
489 }
490
491 session = perf_session__new(output_name, O_WRONLY,
492 write_mode == WRITE_FORCE);
493 if (session == NULL) {
494 pr_err("Not enough memory for reading perf file header\n");
495 return -1;
496 }
497
498 if (!file_new) {
499 err = perf_header__read(&session->header, output);
500 if (err < 0)
501 return err;
502 }
503
504 if (raw_samples) {
505 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
506 } else {
507 for (i = 0; i < nr_counters; i++) {
508 if (attrs[i].sample_type & PERF_SAMPLE_RAW) {
509 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
510 break;
511 }
512 }
513 }
514
515 atexit(atexit_header);
516
517 if (forks) {
518 child_pid = fork();
519 if (pid < 0) {
520 perror("failed to fork");
521 exit(-1);
522 }
523
524 if (!child_pid) {
525 close(child_ready_pipe[0]);
526 close(go_pipe[1]);
527 fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
528
529 /*
530 * Do a dummy execvp to get the PLT entry resolved,
531 * so we avoid the resolver overhead on the real
532 * execvp call.
533 */
534 execvp("", (char **)argv);
535
536 /*
537 * Tell the parent we're ready to go
538 */
539 close(child_ready_pipe[1]);
540
541 /*
542 * Wait until the parent tells us to go.
543 */
544 if (read(go_pipe[0], &buf, 1) == -1)
545 perror("unable to read pipe");
546
547 execvp(argv[0], (char **)argv);
548
549 perror(argv[0]);
550 exit(-1);
551 }
552
553 if (!system_wide && target_tid == -1 && target_pid == -1)
554 all_tids[0] = child_pid;
555
556 close(child_ready_pipe[1]);
557 close(go_pipe[0]);
558 /*
559 * wait for child to settle
560 */
561 if (read(child_ready_pipe[0], &buf, 1) == -1) {
562 perror("unable to read pipe");
563 exit(-1);
564 }
565 close(child_ready_pipe[0]);
566 }
567
568 if ((!system_wide && !inherit) || profile_cpu != -1) {
569 open_counters(profile_cpu);
570 } else {
571 nr_cpus = read_cpu_map();
572 for (i = 0; i < nr_cpus; i++)
573 open_counters(cpumap[i]);
574 }
575
576 if (file_new) {
577 err = perf_header__write(&session->header, output, false);
578 if (err < 0)
579 return err;
580 }
581
582 post_processing_offset = lseek(output, 0, SEEK_CUR);
583
584 err = event__synthesize_kernel_mmap(process_synthesized_event,
585 session, "_text");
586 if (err < 0)
587 err = event__synthesize_kernel_mmap(process_synthesized_event,
588 session, "_stext");
589 if (err < 0) {
590 pr_err("Couldn't record kernel reference relocation symbol.\n");
591 return err;
592 }
593
594 err = event__synthesize_modules(process_synthesized_event, session);
595 if (err < 0) {
596 pr_err("Couldn't record kernel reference relocation symbol.\n");
597 return err;
598 }
599
600 if (!system_wide && profile_cpu == -1)
601 event__synthesize_thread(target_tid, process_synthesized_event,
602 session);
603 else
604 event__synthesize_threads(process_synthesized_event, session);
605
606 if (realtime_prio) {
607 struct sched_param param;
608
609 param.sched_priority = realtime_prio;
610 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
611 pr_err("Could not set realtime priority.\n");
612 exit(-1);
613 }
614 }
615
616 /*
617 * Let the child rip
618 */
619 if (forks)
620 close(go_pipe[1]);
621
622 for (;;) {
623 int hits = samples;
624 int thread;
625
626 for (i = 0; i < nr_cpu; i++) {
627 for (counter = 0; counter < nr_counters; counter++) {
628 for (thread = 0;
629 thread < thread_num; thread++) {
630 if (mmap_array[i][counter][thread].base)
631 mmap_read(&mmap_array[i][counter][thread]);
632 }
633
634 }
635 }
636
637 if (hits == samples) {
638 if (done)
639 break;
640 err = poll(event_array, nr_poll, -1);
641 waking++;
642 }
643
644 if (done) {
645 for (i = 0; i < nr_cpu; i++) {
646 for (counter = 0;
647 counter < nr_counters;
648 counter++) {
649 for (thread = 0;
650 thread < thread_num;
651 thread++)
652 ioctl(fd[i][counter][thread],
653 PERF_EVENT_IOC_DISABLE);
654 }
655 }
656 }
657 }
658
659 fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
660
661 /*
662 * Approximate RIP event size: 24 bytes.
663 */
664 fprintf(stderr,
665 "[ perf record: Captured and wrote %.3f MB %s (~%lld samples) ]\n",
666 (double)bytes_written / 1024.0 / 1024.0,
667 output_name,
668 bytes_written / 24);
669
670 return 0;
671 }
672
673 static const char * const record_usage[] = {
674 "perf record [<options>] [<command>]",
675 "perf record [<options>] -- <command> [<options>]",
676 NULL
677 };
678
679 static bool force, append_file;
680
681 static const struct option options[] = {
682 OPT_CALLBACK('e', "event", NULL, "event",
683 "event selector. use 'perf list' to list available events",
684 parse_events),
685 OPT_CALLBACK(0, "filter", NULL, "filter",
686 "event filter", parse_filter),
687 OPT_INTEGER('p', "pid", &target_pid,
688 "record events on existing process id"),
689 OPT_INTEGER('t', "tid", &target_tid,
690 "record events on existing thread id"),
691 OPT_INTEGER('r', "realtime", &realtime_prio,
692 "collect data with this RT SCHED_FIFO priority"),
693 OPT_BOOLEAN('R', "raw-samples", &raw_samples,
694 "collect raw sample records from all opened counters"),
695 OPT_BOOLEAN('a', "all-cpus", &system_wide,
696 "system-wide collection from all CPUs"),
697 OPT_BOOLEAN('A', "append", &append_file,
698 "append to the output file to do incremental profiling"),
699 OPT_INTEGER('C', "profile_cpu", &profile_cpu,
700 "CPU to profile on"),
701 OPT_BOOLEAN('f', "force", &force,
702 "overwrite existing data file (deprecated)"),
703 OPT_LONG('c', "count", &user_interval,
704 "event period to sample"),
705 OPT_STRING('o', "output", &output_name, "file",
706 "output file name"),
707 OPT_BOOLEAN('i', "inherit", &inherit,
708 "child tasks inherit counters"),
709 OPT_INTEGER('F', "freq", &user_freq,
710 "profile at this frequency"),
711 OPT_INTEGER('m', "mmap-pages", &mmap_pages,
712 "number of mmap data pages"),
713 OPT_BOOLEAN('g', "call-graph", &call_graph,
714 "do call-graph (stack chain/backtrace) recording"),
715 OPT_INCR('v', "verbose", &verbose,
716 "be more verbose (show counter open errors, etc)"),
717 OPT_BOOLEAN('s', "stat", &inherit_stat,
718 "per thread counts"),
719 OPT_BOOLEAN('d', "data", &sample_address,
720 "Sample addresses"),
721 OPT_BOOLEAN('n', "no-samples", &no_samples,
722 "don't sample"),
723 OPT_BOOLEAN('M', "multiplex", &multiplex,
724 "multiplex counter output in a single channel"),
725 OPT_END()
726 };
727
728 int cmd_record(int argc, const char **argv, const char *prefix __used)
729 {
730 int i,j;
731
732 argc = parse_options(argc, argv, options, record_usage,
733 PARSE_OPT_STOP_AT_NON_OPTION);
734 if (!argc && target_pid == -1 && target_tid == -1 &&
735 !system_wide && profile_cpu == -1)
736 usage_with_options(record_usage, options);
737
738 if (force && append_file) {
739 fprintf(stderr, "Can't overwrite and append at the same time."
740 " You need to choose between -f and -A");
741 usage_with_options(record_usage, options);
742 } else if (append_file) {
743 write_mode = WRITE_APPEND;
744 } else {
745 write_mode = WRITE_FORCE;
746 }
747
748 symbol__init();
749
750 if (!nr_counters) {
751 nr_counters = 1;
752 attrs[0].type = PERF_TYPE_HARDWARE;
753 attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
754 }
755
756 if (target_pid != -1) {
757 target_tid = target_pid;
758 thread_num = find_all_tid(target_pid, &all_tids);
759 if (thread_num <= 0) {
760 fprintf(stderr, "Can't find all threads of pid %d\n",
761 target_pid);
762 usage_with_options(record_usage, options);
763 }
764 } else {
765 all_tids=malloc(sizeof(pid_t));
766 if (!all_tids)
767 return -ENOMEM;
768
769 all_tids[0] = target_tid;
770 thread_num = 1;
771 }
772
773 for (i = 0; i < MAX_NR_CPUS; i++) {
774 for (j = 0; j < MAX_COUNTERS; j++) {
775 fd[i][j] = malloc(sizeof(int)*thread_num);
776 mmap_array[i][j] = zalloc(
777 sizeof(struct mmap_data)*thread_num);
778 if (!fd[i][j] || !mmap_array[i][j])
779 return -ENOMEM;
780 }
781 }
782 event_array = malloc(
783 sizeof(struct pollfd)*MAX_NR_CPUS*MAX_COUNTERS*thread_num);
784 if (!event_array)
785 return -ENOMEM;
786
787 if (user_interval != UINT_MAX)
788 default_interval = user_interval;
789 if (user_freq != UINT_MAX)
790 freq = user_freq;
791
792 /*
793 * User specified count overrides default frequency.
794 */
795 if (default_interval)
796 freq = 0;
797 else if (freq) {
798 default_interval = freq;
799 } else {
800 fprintf(stderr, "frequency and count are zero, aborting\n");
801 exit(EXIT_FAILURE);
802 }
803
804 return __cmd_record(argc, argv);
805 }
x86 "subsystem" repository