perf tools: Rename "kernel_info" to "machine"
[linux-2.6.git] / tools / perf / util / event.c
1 #include <linux/types.h>
2 #include "event.h"
3 #include "debug.h"
4 #include "session.h"
5 #include "sort.h"
6 #include "string.h"
7 #include "strlist.h"
8 #include "thread.h"
9
10 static pid_t event__synthesize_comm(pid_t pid, int full,
11                                     event__handler_t process,
12                                     struct perf_session *session)
13 {
14         event_t ev;
15         char filename[PATH_MAX];
16         char bf[BUFSIZ];
17         FILE *fp;
18         size_t size = 0;
19         DIR *tasks;
20         struct dirent dirent, *next;
21         pid_t tgid = 0;
22
23         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
24
25         fp = fopen(filename, "r");
26         if (fp == NULL) {
27 out_race:
28                 /*
29                  * We raced with a task exiting - just return:
30                  */
31                 pr_debug("couldn't open %s\n", filename);
32                 return 0;
33         }
34
35         memset(&ev.comm, 0, sizeof(ev.comm));
36         while (!ev.comm.comm[0] || !ev.comm.pid) {
37                 if (fgets(bf, sizeof(bf), fp) == NULL)
38                         goto out_failure;
39
40                 if (memcmp(bf, "Name:", 5) == 0) {
41                         char *name = bf + 5;
42                         while (*name && isspace(*name))
43                                 ++name;
44                         size = strlen(name) - 1;
45                         memcpy(ev.comm.comm, name, size++);
46                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
47                         char *tgids = bf + 5;
48                         while (*tgids && isspace(*tgids))
49                                 ++tgids;
50                         tgid = ev.comm.pid = atoi(tgids);
51                 }
52         }
53
54         ev.comm.header.type = PERF_RECORD_COMM;
55         size = ALIGN(size, sizeof(u64));
56         ev.comm.header.size = sizeof(ev.comm) - (sizeof(ev.comm.comm) - size);
57
58         if (!full) {
59                 ev.comm.tid = pid;
60
61                 process(&ev, session);
62                 goto out_fclose;
63         }
64
65         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
66
67         tasks = opendir(filename);
68         if (tasks == NULL)
69                 goto out_race;
70
71         while (!readdir_r(tasks, &dirent, &next) && next) {
72                 char *end;
73                 pid = strtol(dirent.d_name, &end, 10);
74                 if (*end)
75                         continue;
76
77                 ev.comm.tid = pid;
78
79                 process(&ev, session);
80         }
81         closedir(tasks);
82
83 out_fclose:
84         fclose(fp);
85         return tgid;
86
87 out_failure:
88         pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
89         return -1;
90 }
91
92 static int event__synthesize_mmap_events(pid_t pid, pid_t tgid,
93                                          event__handler_t process,
94                                          struct perf_session *session)
95 {
96         char filename[PATH_MAX];
97         FILE *fp;
98
99         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
100
101         fp = fopen(filename, "r");
102         if (fp == NULL) {
103                 /*
104                  * We raced with a task exiting - just return:
105                  */
106                 pr_debug("couldn't open %s\n", filename);
107                 return -1;
108         }
109
110         while (1) {
111                 char bf[BUFSIZ], *pbf = bf;
112                 event_t ev = {
113                         .header = {
114                                 .type = PERF_RECORD_MMAP,
115                                 /*
116                                  * Just like the kernel, see __perf_event_mmap
117                                  * in kernel/perf_event.c
118                                  */
119                                 .misc = PERF_RECORD_MISC_USER,
120                          },
121                 };
122                 int n;
123                 size_t size;
124                 if (fgets(bf, sizeof(bf), fp) == NULL)
125                         break;
126
127                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
128                 n = hex2u64(pbf, &ev.mmap.start);
129                 if (n < 0)
130                         continue;
131                 pbf += n + 1;
132                 n = hex2u64(pbf, &ev.mmap.len);
133                 if (n < 0)
134                         continue;
135                 pbf += n + 3;
136                 if (*pbf == 'x') { /* vm_exec */
137                         u64 vm_pgoff;
138                         char *execname = strchr(bf, '/');
139
140                         /* Catch VDSO */
141                         if (execname == NULL)
142                                 execname = strstr(bf, "[vdso]");
143
144                         if (execname == NULL)
145                                 continue;
146
147                         pbf += 3;
148                         n = hex2u64(pbf, &vm_pgoff);
149                         /* pgoff is in bytes, not pages */
150                         if (n >= 0)
151                                 ev.mmap.pgoff = vm_pgoff << getpagesize();
152                         else
153                                 ev.mmap.pgoff = 0;
154
155                         size = strlen(execname);
156                         execname[size - 1] = '\0'; /* Remove \n */
157                         memcpy(ev.mmap.filename, execname, size);
158                         size = ALIGN(size, sizeof(u64));
159                         ev.mmap.len -= ev.mmap.start;
160                         ev.mmap.header.size = (sizeof(ev.mmap) -
161                                                (sizeof(ev.mmap.filename) - size));
162                         ev.mmap.pid = tgid;
163                         ev.mmap.tid = pid;
164
165                         process(&ev, session);
166                 }
167         }
168
169         fclose(fp);
170         return 0;
171 }
172
173 int event__synthesize_modules(event__handler_t process,
174                               struct perf_session *session,
175                               struct machine *machine)
176 {
177         struct rb_node *nd;
178         struct map_groups *kmaps = &machine->kmaps;
179         u16 misc;
180
181         /*
182          * kernel uses 0 for user space maps, see kernel/perf_event.c
183          * __perf_event_mmap
184          */
185         if (machine__is_host(machine))
186                 misc = PERF_RECORD_MISC_KERNEL;
187         else
188                 misc = PERF_RECORD_MISC_GUEST_KERNEL;
189
190         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
191              nd; nd = rb_next(nd)) {
192                 event_t ev;
193                 size_t size;
194                 struct map *pos = rb_entry(nd, struct map, rb_node);
195
196                 if (pos->dso->kernel)
197                         continue;
198
199                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
200                 memset(&ev, 0, sizeof(ev));
201                 ev.mmap.header.misc = misc;
202                 ev.mmap.header.type = PERF_RECORD_MMAP;
203                 ev.mmap.header.size = (sizeof(ev.mmap) -
204                                         (sizeof(ev.mmap.filename) - size));
205                 ev.mmap.start = pos->start;
206                 ev.mmap.len   = pos->end - pos->start;
207                 ev.mmap.pid   = machine->pid;
208
209                 memcpy(ev.mmap.filename, pos->dso->long_name,
210                        pos->dso->long_name_len + 1);
211                 process(&ev, session);
212         }
213
214         return 0;
215 }
216
217 int event__synthesize_thread(pid_t pid, event__handler_t process,
218                              struct perf_session *session)
219 {
220         pid_t tgid = event__synthesize_comm(pid, 1, process, session);
221         if (tgid == -1)
222                 return -1;
223         return event__synthesize_mmap_events(pid, tgid, process, session);
224 }
225
226 void event__synthesize_threads(event__handler_t process,
227                                struct perf_session *session)
228 {
229         DIR *proc;
230         struct dirent dirent, *next;
231
232         proc = opendir("/proc");
233
234         while (!readdir_r(proc, &dirent, &next) && next) {
235                 char *end;
236                 pid_t pid = strtol(dirent.d_name, &end, 10);
237
238                 if (*end) /* only interested in proper numerical dirents */
239                         continue;
240
241                 event__synthesize_thread(pid, process, session);
242         }
243
244         closedir(proc);
245 }
246
247 struct process_symbol_args {
248         const char *name;
249         u64        start;
250 };
251
252 static int find_symbol_cb(void *arg, const char *name, char type, u64 start)
253 {
254         struct process_symbol_args *args = arg;
255
256         /*
257          * Must be a function or at least an alias, as in PARISC64, where "_text" is
258          * an 'A' to the same address as "_stext".
259          */
260         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
261               type == 'A') || strcmp(name, args->name))
262                 return 0;
263
264         args->start = start;
265         return 1;
266 }
267
268 int event__synthesize_kernel_mmap(event__handler_t process,
269                                   struct perf_session *session,
270                                   struct machine *machine,
271                                   const char *symbol_name)
272 {
273         size_t size;
274         const char *filename, *mmap_name;
275         char path[PATH_MAX];
276         char name_buff[PATH_MAX];
277         struct map *map;
278
279         event_t ev = {
280                 .header = {
281                         .type = PERF_RECORD_MMAP,
282                 },
283         };
284         /*
285          * We should get this from /sys/kernel/sections/.text, but till that is
286          * available use this, and after it is use this as a fallback for older
287          * kernels.
288          */
289         struct process_symbol_args args = { .name = symbol_name, };
290
291         mmap_name = machine__mmap_name(machine, name_buff);
292         if (machine__is_host(machine)) {
293                 /*
294                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
295                  * see kernel/perf_event.c __perf_event_mmap
296                  */
297                 ev.header.misc = PERF_RECORD_MISC_KERNEL;
298                 filename = "/proc/kallsyms";
299         } else {
300                 ev.header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
301                 if (machine__is_default_guest(machine))
302                         filename = (char *) symbol_conf.default_guest_kallsyms;
303                 else {
304                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
305                         filename = path;
306                 }
307         }
308
309         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
310                 return -ENOENT;
311
312         map = machine->vmlinux_maps[MAP__FUNCTION];
313         size = snprintf(ev.mmap.filename, sizeof(ev.mmap.filename),
314                         "%s%s", mmap_name, symbol_name) + 1;
315         size = ALIGN(size, sizeof(u64));
316         ev.mmap.header.size = (sizeof(ev.mmap) -
317                         (sizeof(ev.mmap.filename) - size));
318         ev.mmap.pgoff = args.start;
319         ev.mmap.start = map->start;
320         ev.mmap.len   = map->end - ev.mmap.start;
321         ev.mmap.pid   = machine->pid;
322
323         return process(&ev, session);
324 }
325
326 static void thread__comm_adjust(struct thread *self)
327 {
328         char *comm = self->comm;
329
330         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
331             (!symbol_conf.comm_list ||
332              strlist__has_entry(symbol_conf.comm_list, comm))) {
333                 unsigned int slen = strlen(comm);
334
335                 if (slen > comms__col_width) {
336                         comms__col_width = slen;
337                         threads__col_width = slen + 6;
338                 }
339         }
340 }
341
342 static int thread__set_comm_adjust(struct thread *self, const char *comm)
343 {
344         int ret = thread__set_comm(self, comm);
345
346         if (ret)
347                 return ret;
348
349         thread__comm_adjust(self);
350
351         return 0;
352 }
353
354 int event__process_comm(event_t *self, struct perf_session *session)
355 {
356         struct thread *thread = perf_session__findnew(session, self->comm.pid);
357
358         dump_printf(": %s:%d\n", self->comm.comm, self->comm.pid);
359
360         if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm)) {
361                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
362                 return -1;
363         }
364
365         return 0;
366 }
367
368 int event__process_lost(event_t *self, struct perf_session *session)
369 {
370         dump_printf(": id:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
371         session->events_stats.lost += self->lost.lost;
372         return 0;
373 }
374
375 static void event_set_kernel_mmap_len(struct map **maps, event_t *self)
376 {
377         maps[MAP__FUNCTION]->start = self->mmap.start;
378         maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
379         /*
380          * Be a bit paranoid here, some perf.data file came with
381          * a zero sized synthesized MMAP event for the kernel.
382          */
383         if (maps[MAP__FUNCTION]->end == 0)
384                 maps[MAP__FUNCTION]->end = ~0UL;
385 }
386
387 static int event__process_kernel_mmap(event_t *self,
388                         struct perf_session *session)
389 {
390         struct map *map;
391         char kmmap_prefix[PATH_MAX];
392         struct machine *machine;
393         enum dso_kernel_type kernel_type;
394         bool is_kernel_mmap;
395
396         machine = perf_session__findnew_machine(session, self->mmap.pid);
397         if (!machine) {
398                 pr_err("Can't find id %d's machine\n", self->mmap.pid);
399                 goto out_problem;
400         }
401
402         machine__mmap_name(machine, kmmap_prefix);
403         if (machine__is_host(machine))
404                 kernel_type = DSO_TYPE_KERNEL;
405         else
406                 kernel_type = DSO_TYPE_GUEST_KERNEL;
407
408         is_kernel_mmap = memcmp(self->mmap.filename,
409                                 kmmap_prefix,
410                                 strlen(kmmap_prefix)) == 0;
411         if (self->mmap.filename[0] == '/' ||
412             (!is_kernel_mmap && self->mmap.filename[0] == '[')) {
413
414                 char short_module_name[1024];
415                 char *name, *dot;
416
417                 if (self->mmap.filename[0] == '/') {
418                         name = strrchr(self->mmap.filename, '/');
419                         if (name == NULL)
420                                 goto out_problem;
421
422                         ++name; /* skip / */
423                         dot = strrchr(name, '.');
424                         if (dot == NULL)
425                                 goto out_problem;
426                         snprintf(short_module_name, sizeof(short_module_name),
427                                         "[%.*s]", (int)(dot - name), name);
428                         strxfrchar(short_module_name, '-', '_');
429                 } else
430                         strcpy(short_module_name, self->mmap.filename);
431
432                 map = map_groups__new_module(&machine->kmaps,
433                                              self->mmap.start,
434                                              self->mmap.filename, machine);
435                 if (map == NULL)
436                         goto out_problem;
437
438                 name = strdup(short_module_name);
439                 if (name == NULL)
440                         goto out_problem;
441
442                 map->dso->short_name = name;
443                 map->end = map->start + self->mmap.len;
444         } else if (is_kernel_mmap) {
445                 const char *symbol_name = (self->mmap.filename +
446                                 strlen(kmmap_prefix));
447                 /*
448                  * Should be there already, from the build-id table in
449                  * the header.
450                  */
451                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
452                                                      kmmap_prefix);
453                 if (kernel == NULL)
454                         goto out_problem;
455
456                 kernel->kernel = kernel_type;
457                 if (__map_groups__create_kernel_maps(&machine->kmaps,
458                                                      machine->vmlinux_maps,
459                                                      kernel) < 0)
460                         goto out_problem;
461
462                 event_set_kernel_mmap_len(machine->vmlinux_maps, self);
463                 perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
464                                                          symbol_name,
465                                                          self->mmap.pgoff);
466                 if (machine__is_default_guest(machine)) {
467                         /*
468                          * preload dso of guest kernel and modules
469                          */
470                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
471                                   NULL);
472                 }
473         }
474         return 0;
475 out_problem:
476         return -1;
477 }
478
479 int event__process_mmap(event_t *self, struct perf_session *session)
480 {
481         struct machine *machine;
482         struct thread *thread;
483         struct map *map;
484         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
485         int ret = 0;
486
487         dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
488                         self->mmap.pid, self->mmap.tid, self->mmap.start,
489                         self->mmap.len, self->mmap.pgoff, self->mmap.filename);
490
491         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
492             cpumode == PERF_RECORD_MISC_KERNEL) {
493                 ret = event__process_kernel_mmap(self, session);
494                 if (ret < 0)
495                         goto out_problem;
496                 return 0;
497         }
498
499         thread = perf_session__findnew(session, self->mmap.pid);
500         machine = perf_session__find_host_machine(session);
501         map = map__new(&machine->user_dsos, self->mmap.start,
502                         self->mmap.len, self->mmap.pgoff,
503                         self->mmap.pid, self->mmap.filename,
504                         MAP__FUNCTION, session->cwd, session->cwdlen);
505
506         if (thread == NULL || map == NULL)
507                 goto out_problem;
508
509         thread__insert_map(thread, map);
510         return 0;
511
512 out_problem:
513         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
514         return 0;
515 }
516
517 int event__process_task(event_t *self, struct perf_session *session)
518 {
519         struct thread *thread = perf_session__findnew(session, self->fork.pid);
520         struct thread *parent = perf_session__findnew(session, self->fork.ppid);
521
522         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
523                     self->fork.ppid, self->fork.ptid);
524         /*
525          * A thread clone will have the same PID for both parent and child.
526          */
527         if (thread == parent)
528                 return 0;
529
530         if (self->header.type == PERF_RECORD_EXIT)
531                 return 0;
532
533         if (thread == NULL || parent == NULL ||
534             thread__fork(thread, parent) < 0) {
535                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
536                 return -1;
537         }
538
539         return 0;
540 }
541
542 void thread__find_addr_map(struct thread *self,
543                            struct perf_session *session, u8 cpumode,
544                            enum map_type type, pid_t pid, u64 addr,
545                            struct addr_location *al)
546 {
547         struct map_groups *mg = &self->mg;
548         struct machine *machine = NULL;
549
550         al->thread = self;
551         al->addr = addr;
552         al->cpumode = cpumode;
553         al->filtered = false;
554
555         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
556                 al->level = 'k';
557                 machine = perf_session__find_host_machine(session);
558                 mg = &machine->kmaps;
559         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
560                 al->level = '.';
561                 machine = perf_session__find_host_machine(session);
562         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
563                 al->level = 'g';
564                 machine = perf_session__find_machine(session, pid);
565                 if (!machine) {
566                         al->map = NULL;
567                         return;
568                 }
569                 mg = &machine->kmaps;
570         } else {
571                 /*
572                  * 'u' means guest os user space.
573                  * TODO: We don't support guest user space. Might support late.
574                  */
575                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
576                         al->level = 'u';
577                 else
578                         al->level = 'H';
579                 al->map = NULL;
580
581                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
582                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
583                         !perf_guest)
584                         al->filtered = true;
585                 if ((cpumode == PERF_RECORD_MISC_USER ||
586                         cpumode == PERF_RECORD_MISC_KERNEL) &&
587                         !perf_host)
588                         al->filtered = true;
589
590                 return;
591         }
592 try_again:
593         al->map = map_groups__find(mg, type, al->addr);
594         if (al->map == NULL) {
595                 /*
596                  * If this is outside of all known maps, and is a negative
597                  * address, try to look it up in the kernel dso, as it might be
598                  * a vsyscall or vdso (which executes in user-mode).
599                  *
600                  * XXX This is nasty, we should have a symbol list in the
601                  * "[vdso]" dso, but for now lets use the old trick of looking
602                  * in the whole kernel symbol list.
603                  */
604                 if ((long long)al->addr < 0 &&
605                     cpumode == PERF_RECORD_MISC_KERNEL &&
606                     machine && mg != &machine->kmaps) {
607                         mg = &machine->kmaps;
608                         goto try_again;
609                 }
610         } else
611                 al->addr = al->map->map_ip(al->map, al->addr);
612 }
613
614 void thread__find_addr_location(struct thread *self,
615                                 struct perf_session *session, u8 cpumode,
616                                 enum map_type type, pid_t pid, u64 addr,
617                                 struct addr_location *al,
618                                 symbol_filter_t filter)
619 {
620         thread__find_addr_map(self, session, cpumode, type, pid, addr, al);
621         if (al->map != NULL)
622                 al->sym = map__find_symbol(al->map, al->addr, filter);
623         else
624                 al->sym = NULL;
625 }
626
627 static void dso__calc_col_width(struct dso *self)
628 {
629         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
630             (!symbol_conf.dso_list ||
631              strlist__has_entry(symbol_conf.dso_list, self->name))) {
632                 unsigned int slen = strlen(self->name);
633                 if (slen > dsos__col_width)
634                         dsos__col_width = slen;
635         }
636
637         self->slen_calculated = 1;
638 }
639
640 int event__preprocess_sample(const event_t *self, struct perf_session *session,
641                              struct addr_location *al, symbol_filter_t filter)
642 {
643         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
644         struct thread *thread = perf_session__findnew(session, self->ip.pid);
645
646         if (thread == NULL)
647                 return -1;
648
649         if (symbol_conf.comm_list &&
650             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
651                 goto out_filtered;
652
653         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
654
655         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
656                               self->ip.pid, self->ip.ip, al);
657         dump_printf(" ...... dso: %s\n",
658                     al->map ? al->map->dso->long_name :
659                         al->level == 'H' ? "[hypervisor]" : "<not found>");
660         al->sym = NULL;
661
662         if (al->map) {
663                 if (symbol_conf.dso_list &&
664                     (!al->map || !al->map->dso ||
665                      !(strlist__has_entry(symbol_conf.dso_list,
666                                           al->map->dso->short_name) ||
667                        (al->map->dso->short_name != al->map->dso->long_name &&
668                         strlist__has_entry(symbol_conf.dso_list,
669                                            al->map->dso->long_name)))))
670                         goto out_filtered;
671                 /*
672                  * We have to do this here as we may have a dso with no symbol
673                  * hit that has a name longer than the ones with symbols
674                  * sampled.
675                  */
676                 if (!sort_dso.elide && !al->map->dso->slen_calculated)
677                         dso__calc_col_width(al->map->dso);
678
679                 al->sym = map__find_symbol(al->map, al->addr, filter);
680         }
681
682         if (symbol_conf.sym_list && al->sym &&
683             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
684                 goto out_filtered;
685
686         return 0;
687
688 out_filtered:
689         al->filtered = true;
690         return 0;
691 }
692
693 int event__parse_sample(event_t *event, u64 type, struct sample_data *data)
694 {
695         u64 *array = event->sample.array;
696
697         if (type & PERF_SAMPLE_IP) {
698                 data->ip = event->ip.ip;
699                 array++;
700         }
701
702         if (type & PERF_SAMPLE_TID) {
703                 u32 *p = (u32 *)array;
704                 data->pid = p[0];
705                 data->tid = p[1];
706                 array++;
707         }
708
709         if (type & PERF_SAMPLE_TIME) {
710                 data->time = *array;
711                 array++;
712         }
713
714         if (type & PERF_SAMPLE_ADDR) {
715                 data->addr = *array;
716                 array++;
717         }
718
719         if (type & PERF_SAMPLE_ID) {
720                 data->id = *array;
721                 array++;
722         }
723
724         if (type & PERF_SAMPLE_STREAM_ID) {
725                 data->stream_id = *array;
726                 array++;
727         }
728
729         if (type & PERF_SAMPLE_CPU) {
730                 u32 *p = (u32 *)array;
731                 data->cpu = *p;
732                 array++;
733         }
734
735         if (type & PERF_SAMPLE_PERIOD) {
736                 data->period = *array;
737                 array++;
738         }
739
740         if (type & PERF_SAMPLE_READ) {
741                 pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
742                 return -1;
743         }
744
745         if (type & PERF_SAMPLE_CALLCHAIN) {
746                 data->callchain = (struct ip_callchain *)array;
747                 array += 1 + data->callchain->nr;
748         }
749
750         if (type & PERF_SAMPLE_RAW) {
751                 u32 *p = (u32 *)array;
752                 data->raw_size = *p;
753                 p++;
754                 data->raw_data = p;
755         }
756
757         return 0;
758 }