17d1dcb3c66771cb1d7603cff6a5ed981d44ca69
[linux-2.6.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/evlist.h"
22 #include "util/evsel.h"
23 #include "util/debug.h"
24 #include "util/session.h"
25 #include "util/symbol.h"
26 #include "util/cpumap.h"
27 #include "util/thread_map.h"
28
29 #include <unistd.h>
30 #include <sched.h>
31 #include <sys/mman.h>
32
33 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
34
35 enum write_mode_t {
36         WRITE_FORCE,
37         WRITE_APPEND
38 };
39
40 static u64                      user_interval                   = ULLONG_MAX;
41 static u64                      default_interval                =      0;
42
43 static unsigned int             page_size;
44 static unsigned int             mmap_pages                      = UINT_MAX;
45 static unsigned int             user_freq                       = UINT_MAX;
46 static int                      freq                            =   1000;
47 static int                      output;
48 static int                      pipe_output                     =      0;
49 static const char               *output_name                    = NULL;
50 static int                      group                           =      0;
51 static int                      realtime_prio                   =      0;
52 static bool                     nodelay                         =  false;
53 static bool                     raw_samples                     =  false;
54 static bool                     sample_id_all_avail             =   true;
55 static bool                     system_wide                     =  false;
56 static pid_t                    target_pid                      =     -1;
57 static pid_t                    target_tid                      =     -1;
58 static pid_t                    child_pid                       =     -1;
59 static bool                     no_inherit                      =  false;
60 static enum write_mode_t        write_mode                      = WRITE_FORCE;
61 static bool                     call_graph                      =  false;
62 static bool                     inherit_stat                    =  false;
63 static bool                     no_samples                      =  false;
64 static bool                     sample_address                  =  false;
65 static bool                     sample_time                     =  false;
66 static bool                     no_buildid                      =  false;
67 static bool                     no_buildid_cache                =  false;
68 static struct perf_evlist       *evsel_list;
69
70 static long                     samples                         =      0;
71 static u64                      bytes_written                   =      0;
72
73 static int                      file_new                        =      1;
74 static off_t                    post_processing_offset;
75
76 static struct perf_session      *session;
77 static const char               *cpu_list;
78
79 static void advance_output(size_t size)
80 {
81         bytes_written += size;
82 }
83
84 static void write_output(void *buf, size_t size)
85 {
86         while (size) {
87                 int ret = write(output, buf, size);
88
89                 if (ret < 0)
90                         die("failed to write");
91
92                 size -= ret;
93                 buf += ret;
94
95                 bytes_written += ret;
96         }
97 }
98
99 static int process_synthesized_event(union perf_event *event,
100                                      struct perf_sample *sample __used,
101                                      struct perf_session *self __used)
102 {
103         write_output(event, event->header.size);
104         return 0;
105 }
106
107 static void mmap_read(struct perf_mmap *md)
108 {
109         unsigned int head = perf_mmap__read_head(md);
110         unsigned int old = md->prev;
111         unsigned char *data = md->base + page_size;
112         unsigned long size;
113         void *buf;
114
115         if (old == head)
116                 return;
117
118         samples++;
119
120         size = head - old;
121
122         if ((old & md->mask) + size != (head & md->mask)) {
123                 buf = &data[old & md->mask];
124                 size = md->mask + 1 - (old & md->mask);
125                 old += size;
126
127                 write_output(buf, size);
128         }
129
130         buf = &data[old & md->mask];
131         size = head - old;
132         old += size;
133
134         write_output(buf, size);
135
136         md->prev = old;
137         perf_mmap__write_tail(md, old);
138 }
139
140 static volatile int done = 0;
141 static volatile int signr = -1;
142
143 static void sig_handler(int sig)
144 {
145         done = 1;
146         signr = sig;
147 }
148
149 static void sig_atexit(void)
150 {
151         if (child_pid > 0)
152                 kill(child_pid, SIGTERM);
153
154         if (signr == -1 || signr == SIGUSR1)
155                 return;
156
157         signal(signr, SIG_DFL);
158         kill(getpid(), signr);
159 }
160
161 static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist)
162 {
163         struct perf_event_attr *attr = &evsel->attr;
164         int track = !evsel->idx; /* only the first counter needs these */
165
166         attr->read_format       = PERF_FORMAT_TOTAL_TIME_ENABLED |
167                                   PERF_FORMAT_TOTAL_TIME_RUNNING |
168                                   PERF_FORMAT_ID;
169
170         attr->sample_type       |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
171
172         if (evlist->nr_entries > 1)
173                 attr->sample_type |= PERF_SAMPLE_ID;
174
175         /*
176          * We default some events to a 1 default interval. But keep
177          * it a weak assumption overridable by the user.
178          */
179         if (!attr->sample_period || (user_freq != UINT_MAX &&
180                                      user_interval != ULLONG_MAX)) {
181                 if (freq) {
182                         attr->sample_type       |= PERF_SAMPLE_PERIOD;
183                         attr->freq              = 1;
184                         attr->sample_freq       = freq;
185                 } else {
186                         attr->sample_period = default_interval;
187                 }
188         }
189
190         if (no_samples)
191                 attr->sample_freq = 0;
192
193         if (inherit_stat)
194                 attr->inherit_stat = 1;
195
196         if (sample_address) {
197                 attr->sample_type       |= PERF_SAMPLE_ADDR;
198                 attr->mmap_data = track;
199         }
200
201         if (call_graph)
202                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
203
204         if (system_wide)
205                 attr->sample_type       |= PERF_SAMPLE_CPU;
206
207         if (sample_id_all_avail &&
208             (sample_time || system_wide || !no_inherit || cpu_list))
209                 attr->sample_type       |= PERF_SAMPLE_TIME;
210
211         if (raw_samples) {
212                 attr->sample_type       |= PERF_SAMPLE_TIME;
213                 attr->sample_type       |= PERF_SAMPLE_RAW;
214                 attr->sample_type       |= PERF_SAMPLE_CPU;
215         }
216
217         if (nodelay) {
218                 attr->watermark = 0;
219                 attr->wakeup_events = 1;
220         }
221
222         attr->mmap              = track;
223         attr->comm              = track;
224
225         if (target_pid == -1 && target_tid == -1 && !system_wide) {
226                 attr->disabled = 1;
227                 attr->enable_on_exec = 1;
228         }
229 }
230
231 static bool perf_evlist__equal(struct perf_evlist *evlist,
232                                struct perf_evlist *other)
233 {
234         struct perf_evsel *pos, *pair;
235
236         if (evlist->nr_entries != other->nr_entries)
237                 return false;
238
239         pair = list_entry(other->entries.next, struct perf_evsel, node);
240
241         list_for_each_entry(pos, &evlist->entries, node) {
242                 if (memcmp(&pos->attr, &pair->attr, sizeof(pos->attr) != 0))
243                         return false;
244                 pair = list_entry(pair->node.next, struct perf_evsel, node);
245         }
246
247         return true;
248 }
249
250 static void open_counters(struct perf_evlist *evlist)
251 {
252         struct perf_evsel *pos;
253
254         list_for_each_entry(pos, &evlist->entries, node) {
255                 struct perf_event_attr *attr = &pos->attr;
256                 /*
257                  * Check if parse_single_tracepoint_event has already asked for
258                  * PERF_SAMPLE_TIME.
259                  *
260                  * XXX this is kludgy but short term fix for problems introduced by
261                  * eac23d1c that broke 'perf script' by having different sample_types
262                  * when using multiple tracepoint events when we use a perf binary
263                  * that tries to use sample_id_all on an older kernel.
264                  *
265                  * We need to move counter creation to perf_session, support
266                  * different sample_types, etc.
267                  */
268                 bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;
269
270                 config_attr(pos, evlist);
271 retry_sample_id:
272                 attr->sample_id_all = sample_id_all_avail ? 1 : 0;
273 try_again:
274                 if (perf_evsel__open(pos, evlist->cpus, evlist->threads, group,
275                                      !no_inherit) < 0) {
276                         int err = errno;
277
278                         if (err == EPERM || err == EACCES) {
279                                 ui__warning_paranoid();
280                                 exit(EXIT_FAILURE);
281                         } else if (err ==  ENODEV && cpu_list) {
282                                 die("No such device - did you specify"
283                                         " an out-of-range profile CPU?\n");
284                         } else if (err == EINVAL && sample_id_all_avail) {
285                                 /*
286                                  * Old kernel, no attr->sample_id_type_all field
287                                  */
288                                 sample_id_all_avail = false;
289                                 if (!sample_time && !raw_samples && !time_needed)
290                                         attr->sample_type &= ~PERF_SAMPLE_TIME;
291
292                                 goto retry_sample_id;
293                         }
294
295                         /*
296                          * If it's cycles then fall back to hrtimer
297                          * based cpu-clock-tick sw counter, which
298                          * is always available even if no PMU support:
299                          */
300                         if (attr->type == PERF_TYPE_HARDWARE
301                                         && attr->config == PERF_COUNT_HW_CPU_CYCLES) {
302
303                                 if (verbose)
304                                         ui__warning("The cycles event is not supported, "
305                                                     "trying to fall back to cpu-clock-ticks\n");
306                                 attr->type = PERF_TYPE_SOFTWARE;
307                                 attr->config = PERF_COUNT_SW_CPU_CLOCK;
308                                 goto try_again;
309                         }
310
311                         if (err == ENOENT) {
312                                 ui__warning("The %s event is not supported.\n",
313                                             event_name(pos));
314                                 exit(EXIT_FAILURE);
315                         }
316
317                         printf("\n");
318                         error("sys_perf_event_open() syscall returned with %d (%s).  /bin/dmesg may provide additional information.\n",
319                               err, strerror(err));
320
321 #if defined(__i386__) || defined(__x86_64__)
322                         if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
323                                 die("No hardware sampling interrupt available."
324                                     " No APIC? If so then you can boot the kernel"
325                                     " with the \"lapic\" boot parameter to"
326                                     " force-enable it.\n");
327 #endif
328
329                         die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
330                 }
331         }
332
333         if (perf_evlist__set_filters(evlist)) {
334                 error("failed to set filter with %d (%s)\n", errno,
335                         strerror(errno));
336                 exit(-1);
337         }
338
339         if (perf_evlist__mmap(evlist, mmap_pages, false) < 0)
340                 die("failed to mmap with %d (%s)\n", errno, strerror(errno));
341
342         if (file_new)
343                 session->evlist = evlist;
344         else {
345                 if (!perf_evlist__equal(session->evlist, evlist)) {
346                         fprintf(stderr, "incompatible append\n");
347                         exit(-1);
348                 }
349         }
350
351         perf_session__update_sample_type(session);
352 }
353
354 static int process_buildids(void)
355 {
356         u64 size = lseek(output, 0, SEEK_CUR);
357
358         if (size == 0)
359                 return 0;
360
361         session->fd = output;
362         return __perf_session__process_events(session, post_processing_offset,
363                                               size - post_processing_offset,
364                                               size, &build_id__mark_dso_hit_ops);
365 }
366
367 static void atexit_header(void)
368 {
369         if (!pipe_output) {
370                 session->header.data_size += bytes_written;
371
372                 if (!no_buildid)
373                         process_buildids();
374                 perf_session__write_header(session, evsel_list, output, true);
375                 perf_session__delete(session);
376                 perf_evlist__delete(evsel_list);
377                 symbol__exit();
378         }
379 }
380
381 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
382 {
383         int err;
384         struct perf_session *psession = data;
385
386         if (machine__is_host(machine))
387                 return;
388
389         /*
390          *As for guest kernel when processing subcommand record&report,
391          *we arrange module mmap prior to guest kernel mmap and trigger
392          *a preload dso because default guest module symbols are loaded
393          *from guest kallsyms instead of /lib/modules/XXX/XXX. This
394          *method is used to avoid symbol missing when the first addr is
395          *in module instead of in guest kernel.
396          */
397         err = perf_event__synthesize_modules(process_synthesized_event,
398                                              psession, machine);
399         if (err < 0)
400                 pr_err("Couldn't record guest kernel [%d]'s reference"
401                        " relocation symbol.\n", machine->pid);
402
403         /*
404          * We use _stext for guest kernel because guest kernel's /proc/kallsyms
405          * have no _text sometimes.
406          */
407         err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
408                                                  psession, machine, "_text");
409         if (err < 0)
410                 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
411                                                          psession, machine,
412                                                          "_stext");
413         if (err < 0)
414                 pr_err("Couldn't record guest kernel [%d]'s reference"
415                        " relocation symbol.\n", machine->pid);
416 }
417
418 static struct perf_event_header finished_round_event = {
419         .size = sizeof(struct perf_event_header),
420         .type = PERF_RECORD_FINISHED_ROUND,
421 };
422
423 static void mmap_read_all(void)
424 {
425         int i;
426
427         for (i = 0; i < evsel_list->cpus->nr; i++) {
428                 if (evsel_list->mmap[i].base)
429                         mmap_read(&evsel_list->mmap[i]);
430         }
431
432         if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
433                 write_output(&finished_round_event, sizeof(finished_round_event));
434 }
435
436 static int __cmd_record(int argc, const char **argv)
437 {
438         int i;
439         struct stat st;
440         int flags;
441         int err;
442         unsigned long waking = 0;
443         int child_ready_pipe[2], go_pipe[2];
444         const bool forks = argc > 0;
445         char buf;
446         struct machine *machine;
447
448         page_size = sysconf(_SC_PAGE_SIZE);
449
450         atexit(sig_atexit);
451         signal(SIGCHLD, sig_handler);
452         signal(SIGINT, sig_handler);
453         signal(SIGUSR1, sig_handler);
454
455         if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
456                 perror("failed to create pipes");
457                 exit(-1);
458         }
459
460         if (!output_name) {
461                 if (!fstat(STDOUT_FILENO, &st) && S_ISFIFO(st.st_mode))
462                         pipe_output = 1;
463                 else
464                         output_name = "perf.data";
465         }
466         if (output_name) {
467                 if (!strcmp(output_name, "-"))
468                         pipe_output = 1;
469                 else if (!stat(output_name, &st) && st.st_size) {
470                         if (write_mode == WRITE_FORCE) {
471                                 char oldname[PATH_MAX];
472                                 snprintf(oldname, sizeof(oldname), "%s.old",
473                                          output_name);
474                                 unlink(oldname);
475                                 rename(output_name, oldname);
476                         }
477                 } else if (write_mode == WRITE_APPEND) {
478                         write_mode = WRITE_FORCE;
479                 }
480         }
481
482         flags = O_CREAT|O_RDWR;
483         if (write_mode == WRITE_APPEND)
484                 file_new = 0;
485         else
486                 flags |= O_TRUNC;
487
488         if (pipe_output)
489                 output = STDOUT_FILENO;
490         else
491                 output = open(output_name, flags, S_IRUSR | S_IWUSR);
492         if (output < 0) {
493                 perror("failed to create output file");
494                 exit(-1);
495         }
496
497         session = perf_session__new(output_name, O_WRONLY,
498                                     write_mode == WRITE_FORCE, false, NULL);
499         if (session == NULL) {
500                 pr_err("Not enough memory for reading perf file header\n");
501                 return -1;
502         }
503
504         if (!no_buildid)
505                 perf_header__set_feat(&session->header, HEADER_BUILD_ID);
506
507         if (!file_new) {
508                 err = perf_session__read_header(session, output);
509                 if (err < 0)
510                         goto out_delete_session;
511         }
512
513         if (have_tracepoints(&evsel_list->entries))
514                 perf_header__set_feat(&session->header, HEADER_TRACE_INFO);
515
516         /* 512 kiB: default amount of unprivileged mlocked memory */
517         if (mmap_pages == UINT_MAX)
518                 mmap_pages = (512 * 1024) / page_size;
519
520         if (forks) {
521                 child_pid = fork();
522                 if (child_pid < 0) {
523                         perror("failed to fork");
524                         exit(-1);
525                 }
526
527                 if (!child_pid) {
528                         if (pipe_output)
529                                 dup2(2, 1);
530                         close(child_ready_pipe[0]);
531                         close(go_pipe[1]);
532                         fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
533
534                         /*
535                          * Do a dummy execvp to get the PLT entry resolved,
536                          * so we avoid the resolver overhead on the real
537                          * execvp call.
538                          */
539                         execvp("", (char **)argv);
540
541                         /*
542                          * Tell the parent we're ready to go
543                          */
544                         close(child_ready_pipe[1]);
545
546                         /*
547                          * Wait until the parent tells us to go.
548                          */
549                         if (read(go_pipe[0], &buf, 1) == -1)
550                                 perror("unable to read pipe");
551
552                         execvp(argv[0], (char **)argv);
553
554                         perror(argv[0]);
555                         kill(getppid(), SIGUSR1);
556                         exit(-1);
557                 }
558
559                 if (!system_wide && target_tid == -1 && target_pid == -1)
560                         evsel_list->threads->map[0] = child_pid;
561
562                 close(child_ready_pipe[1]);
563                 close(go_pipe[0]);
564                 /*
565                  * wait for child to settle
566                  */
567                 if (read(child_ready_pipe[0], &buf, 1) == -1) {
568                         perror("unable to read pipe");
569                         exit(-1);
570                 }
571                 close(child_ready_pipe[0]);
572         }
573
574         open_counters(evsel_list);
575
576         /*
577          * perf_session__delete(session) will be called at atexit_header()
578          */
579         atexit(atexit_header);
580
581         if (pipe_output) {
582                 err = perf_header__write_pipe(output);
583                 if (err < 0)
584                         return err;
585         } else if (file_new) {
586                 err = perf_session__write_header(session, evsel_list,
587                                                  output, false);
588                 if (err < 0)
589                         return err;
590         }
591
592         post_processing_offset = lseek(output, 0, SEEK_CUR);
593
594         if (pipe_output) {
595                 err = perf_session__synthesize_attrs(session,
596                                                      process_synthesized_event);
597                 if (err < 0) {
598                         pr_err("Couldn't synthesize attrs.\n");
599                         return err;
600                 }
601
602                 err = perf_event__synthesize_event_types(process_synthesized_event,
603                                                          session);
604                 if (err < 0) {
605                         pr_err("Couldn't synthesize event_types.\n");
606                         return err;
607                 }
608
609                 if (have_tracepoints(&evsel_list->entries)) {
610                         /*
611                          * FIXME err <= 0 here actually means that
612                          * there were no tracepoints so its not really
613                          * an error, just that we don't need to
614                          * synthesize anything.  We really have to
615                          * return this more properly and also
616                          * propagate errors that now are calling die()
617                          */
618                         err = perf_event__synthesize_tracing_data(output, evsel_list,
619                                                                   process_synthesized_event,
620                                                                   session);
621                         if (err <= 0) {
622                                 pr_err("Couldn't record tracing data.\n");
623                                 return err;
624                         }
625                         advance_output(err);
626                 }
627         }
628
629         machine = perf_session__find_host_machine(session);
630         if (!machine) {
631                 pr_err("Couldn't find native kernel information.\n");
632                 return -1;
633         }
634
635         err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
636                                                  session, machine, "_text");
637         if (err < 0)
638                 err = perf_event__synthesize_kernel_mmap(process_synthesized_event,
639                                                          session, machine, "_stext");
640         if (err < 0)
641                 pr_err("Couldn't record kernel reference relocation symbol\n"
642                        "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
643                        "Check /proc/kallsyms permission or run as root.\n");
644
645         err = perf_event__synthesize_modules(process_synthesized_event,
646                                              session, machine);
647         if (err < 0)
648                 pr_err("Couldn't record kernel module information.\n"
649                        "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
650                        "Check /proc/modules permission or run as root.\n");
651
652         if (perf_guest)
653                 perf_session__process_machines(session,
654                                                perf_event__synthesize_guest_os);
655
656         if (!system_wide)
657                 perf_event__synthesize_thread_map(evsel_list->threads,
658                                                   process_synthesized_event,
659                                                   session);
660         else
661                 perf_event__synthesize_threads(process_synthesized_event,
662                                                session);
663
664         if (realtime_prio) {
665                 struct sched_param param;
666
667                 param.sched_priority = realtime_prio;
668                 if (sched_setscheduler(0, SCHED_FIFO, &param)) {
669                         pr_err("Could not set realtime priority.\n");
670                         exit(-1);
671                 }
672         }
673
674         /*
675          * Let the child rip
676          */
677         if (forks)
678                 close(go_pipe[1]);
679
680         for (;;) {
681                 int hits = samples;
682                 int thread;
683
684                 mmap_read_all();
685
686                 if (hits == samples) {
687                         if (done)
688                                 break;
689                         err = poll(evsel_list->pollfd, evsel_list->nr_fds, -1);
690                         waking++;
691                 }
692
693                 if (done) {
694                         for (i = 0; i < evsel_list->cpus->nr; i++) {
695                                 struct perf_evsel *pos;
696
697                                 list_for_each_entry(pos, &evsel_list->entries, node) {
698                                         for (thread = 0;
699                                                 thread < evsel_list->threads->nr;
700                                                 thread++)
701                                                 ioctl(FD(pos, i, thread),
702                                                         PERF_EVENT_IOC_DISABLE);
703                                 }
704                         }
705                 }
706         }
707
708         if (quiet || signr == SIGUSR1)
709                 return 0;
710
711         fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
712
713         /*
714          * Approximate RIP event size: 24 bytes.
715          */
716         fprintf(stderr,
717                 "[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
718                 (double)bytes_written / 1024.0 / 1024.0,
719                 output_name,
720                 bytes_written / 24);
721
722         return 0;
723
724 out_delete_session:
725         perf_session__delete(session);
726         return err;
727 }
728
729 static const char * const record_usage[] = {
730         "perf record [<options>] [<command>]",
731         "perf record [<options>] -- <command> [<options>]",
732         NULL
733 };
734
735 static bool force, append_file;
736
737 const struct option record_options[] = {
738         OPT_CALLBACK('e', "event", &evsel_list, "event",
739                      "event selector. use 'perf list' to list available events",
740                      parse_events),
741         OPT_CALLBACK(0, "filter", &evsel_list, "filter",
742                      "event filter", parse_filter),
743         OPT_INTEGER('p', "pid", &target_pid,
744                     "record events on existing process id"),
745         OPT_INTEGER('t', "tid", &target_tid,
746                     "record events on existing thread id"),
747         OPT_INTEGER('r', "realtime", &realtime_prio,
748                     "collect data with this RT SCHED_FIFO priority"),
749         OPT_BOOLEAN('D', "no-delay", &nodelay,
750                     "collect data without buffering"),
751         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
752                     "collect raw sample records from all opened counters"),
753         OPT_BOOLEAN('a', "all-cpus", &system_wide,
754                             "system-wide collection from all CPUs"),
755         OPT_BOOLEAN('A', "append", &append_file,
756                             "append to the output file to do incremental profiling"),
757         OPT_STRING('C', "cpu", &cpu_list, "cpu",
758                     "list of cpus to monitor"),
759         OPT_BOOLEAN('f', "force", &force,
760                         "overwrite existing data file (deprecated)"),
761         OPT_U64('c', "count", &user_interval, "event period to sample"),
762         OPT_STRING('o', "output", &output_name, "file",
763                     "output file name"),
764         OPT_BOOLEAN('i', "no-inherit", &no_inherit,
765                     "child tasks do not inherit counters"),
766         OPT_UINTEGER('F', "freq", &user_freq, "profile at this frequency"),
767         OPT_UINTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"),
768         OPT_BOOLEAN('g', "call-graph", &call_graph,
769                     "do call-graph (stack chain/backtrace) recording"),
770         OPT_INCR('v', "verbose", &verbose,
771                     "be more verbose (show counter open errors, etc)"),
772         OPT_BOOLEAN('q', "quiet", &quiet, "don't print any message"),
773         OPT_BOOLEAN('s', "stat", &inherit_stat,
774                     "per thread counts"),
775         OPT_BOOLEAN('d', "data", &sample_address,
776                     "Sample addresses"),
777         OPT_BOOLEAN('T', "timestamp", &sample_time, "Sample timestamps"),
778         OPT_BOOLEAN('n', "no-samples", &no_samples,
779                     "don't sample"),
780         OPT_BOOLEAN('N', "no-buildid-cache", &no_buildid_cache,
781                     "do not update the buildid cache"),
782         OPT_BOOLEAN('B', "no-buildid", &no_buildid,
783                     "do not collect buildids in perf.data"),
784         OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
785                      "monitor event in cgroup name only",
786                      parse_cgroups),
787         OPT_END()
788 };
789
790 int cmd_record(int argc, const char **argv, const char *prefix __used)
791 {
792         int err = -ENOMEM;
793         struct perf_evsel *pos;
794
795         evsel_list = perf_evlist__new(NULL, NULL);
796         if (evsel_list == NULL)
797                 return -ENOMEM;
798
799         argc = parse_options(argc, argv, record_options, record_usage,
800                             PARSE_OPT_STOP_AT_NON_OPTION);
801         if (!argc && target_pid == -1 && target_tid == -1 &&
802                 !system_wide && !cpu_list)
803                 usage_with_options(record_usage, record_options);
804
805         if (force && append_file) {
806                 fprintf(stderr, "Can't overwrite and append at the same time."
807                                 " You need to choose between -f and -A");
808                 usage_with_options(record_usage, record_options);
809         } else if (append_file) {
810                 write_mode = WRITE_APPEND;
811         } else {
812                 write_mode = WRITE_FORCE;
813         }
814
815         if (nr_cgroups && !system_wide) {
816                 fprintf(stderr, "cgroup monitoring only available in"
817                         " system-wide mode\n");
818                 usage_with_options(record_usage, record_options);
819         }
820
821         symbol__init();
822
823         if (no_buildid_cache || no_buildid)
824                 disable_buildid_cache();
825
826         if (evsel_list->nr_entries == 0 &&
827             perf_evlist__add_default(evsel_list) < 0) {
828                 pr_err("Not enough memory for event selector list\n");
829                 goto out_symbol_exit;
830         }
831
832         if (target_pid != -1)
833                 target_tid = target_pid;
834
835         if (perf_evlist__create_maps(evsel_list, target_pid,
836                                      target_tid, cpu_list) < 0)
837                 usage_with_options(record_usage, record_options);
838
839         list_for_each_entry(pos, &evsel_list->entries, node) {
840                 if (perf_evsel__alloc_fd(pos, evsel_list->cpus->nr,
841                                          evsel_list->threads->nr) < 0)
842                         goto out_free_fd;
843                 if (perf_header__push_event(pos->attr.config, event_name(pos)))
844                         goto out_free_fd;
845         }
846
847         if (perf_evlist__alloc_pollfd(evsel_list) < 0)
848                 goto out_free_fd;
849
850         if (user_interval != ULLONG_MAX)
851                 default_interval = user_interval;
852         if (user_freq != UINT_MAX)
853                 freq = user_freq;
854
855         /*
856          * User specified count overrides default frequency.
857          */
858         if (default_interval)
859                 freq = 0;
860         else if (freq) {
861                 default_interval = freq;
862         } else {
863                 fprintf(stderr, "frequency and count are zero, aborting\n");
864                 err = -EINVAL;
865                 goto out_free_fd;
866         }
867
868         err = __cmd_record(argc, argv);
869 out_free_fd:
870         perf_evlist__delete_maps(evsel_list);
871 out_symbol_exit:
872         symbol__exit();
873         return err;
874 }