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perf symbols: Record the reason for filtering an address_location
[deliverable/linux.git] / tools / perf / util / event.c
1 #include <linux/types.h>
2 #include "event.h"
3 #include "debug.h"
4 #include "hist.h"
5 #include "machine.h"
6 #include "sort.h"
7 #include "string.h"
8 #include "strlist.h"
9 #include "thread.h"
10 #include "thread_map.h"
11 #include "symbol/kallsyms.h"
12
13 static const char *perf_event__names[] = {
14 [0] = "TOTAL",
15 [PERF_RECORD_MMAP] = "MMAP",
16 [PERF_RECORD_MMAP2] = "MMAP2",
17 [PERF_RECORD_LOST] = "LOST",
18 [PERF_RECORD_COMM] = "COMM",
19 [PERF_RECORD_EXIT] = "EXIT",
20 [PERF_RECORD_THROTTLE] = "THROTTLE",
21 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
22 [PERF_RECORD_FORK] = "FORK",
23 [PERF_RECORD_READ] = "READ",
24 [PERF_RECORD_SAMPLE] = "SAMPLE",
25 [PERF_RECORD_HEADER_ATTR] = "ATTR",
26 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
27 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
28 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
29 [PERF_RECORD_FINISHED_ROUND] = "FINISHED_ROUND",
30 };
31
32 const char *perf_event__name(unsigned int id)
33 {
34 if (id >= ARRAY_SIZE(perf_event__names))
35 return "INVALID";
36 if (!perf_event__names[id])
37 return "UNKNOWN";
38 return perf_event__names[id];
39 }
40
41 static struct perf_sample synth_sample = {
42 .pid = -1,
43 .tid = -1,
44 .time = -1,
45 .stream_id = -1,
46 .cpu = -1,
47 .period = 1,
48 };
49
50 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
51 {
52 char filename[PATH_MAX];
53 char bf[BUFSIZ];
54 FILE *fp;
55 size_t size = 0;
56 pid_t tgid = -1;
57
58 snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
59
60 fp = fopen(filename, "r");
61 if (fp == NULL) {
62 pr_debug("couldn't open %s\n", filename);
63 return 0;
64 }
65
66 while (!comm[0] || (tgid < 0)) {
67 if (fgets(bf, sizeof(bf), fp) == NULL) {
68 pr_warning("couldn't get COMM and pgid, malformed %s\n",
69 filename);
70 break;
71 }
72
73 if (memcmp(bf, "Name:", 5) == 0) {
74 char *name = bf + 5;
75 while (*name && isspace(*name))
76 ++name;
77 size = strlen(name) - 1;
78 if (size >= len)
79 size = len - 1;
80 memcpy(comm, name, size);
81 comm[size] = '\0';
82
83 } else if (memcmp(bf, "Tgid:", 5) == 0) {
84 char *tgids = bf + 5;
85 while (*tgids && isspace(*tgids))
86 ++tgids;
87 tgid = atoi(tgids);
88 }
89 }
90
91 fclose(fp);
92
93 return tgid;
94 }
95
96 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
97 union perf_event *event, pid_t pid,
98 perf_event__handler_t process,
99 struct machine *machine)
100 {
101 size_t size;
102 pid_t tgid;
103
104 memset(&event->comm, 0, sizeof(event->comm));
105
106 if (machine__is_host(machine))
107 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
108 sizeof(event->comm.comm));
109 else
110 tgid = machine->pid;
111
112 if (tgid < 0)
113 goto out;
114
115 event->comm.pid = tgid;
116 event->comm.header.type = PERF_RECORD_COMM;
117
118 size = strlen(event->comm.comm) + 1;
119 size = PERF_ALIGN(size, sizeof(u64));
120 memset(event->comm.comm + size, 0, machine->id_hdr_size);
121 event->comm.header.size = (sizeof(event->comm) -
122 (sizeof(event->comm.comm) - size) +
123 machine->id_hdr_size);
124 event->comm.tid = pid;
125
126 if (process(tool, event, &synth_sample, machine) != 0)
127 return -1;
128
129 out:
130 return tgid;
131 }
132
133 static int perf_event__synthesize_fork(struct perf_tool *tool,
134 union perf_event *event, pid_t pid,
135 pid_t tgid, perf_event__handler_t process,
136 struct machine *machine)
137 {
138 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
139
140 /* this is really a clone event but we use fork to synthesize it */
141 event->fork.ppid = tgid;
142 event->fork.ptid = tgid;
143 event->fork.pid = tgid;
144 event->fork.tid = pid;
145 event->fork.header.type = PERF_RECORD_FORK;
146
147 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
148
149 if (process(tool, event, &synth_sample, machine) != 0)
150 return -1;
151
152 return 0;
153 }
154
155 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
156 union perf_event *event,
157 pid_t pid, pid_t tgid,
158 perf_event__handler_t process,
159 struct machine *machine,
160 bool mmap_data)
161 {
162 char filename[PATH_MAX];
163 FILE *fp;
164 int rc = 0;
165
166 if (machine__is_default_guest(machine))
167 return 0;
168
169 snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
170 machine->root_dir, pid);
171
172 fp = fopen(filename, "r");
173 if (fp == NULL) {
174 /*
175 * We raced with a task exiting - just return:
176 */
177 pr_debug("couldn't open %s\n", filename);
178 return -1;
179 }
180
181 event->header.type = PERF_RECORD_MMAP;
182
183 while (1) {
184 char bf[BUFSIZ];
185 char prot[5];
186 char execname[PATH_MAX];
187 char anonstr[] = "//anon";
188 size_t size;
189 ssize_t n;
190
191 if (fgets(bf, sizeof(bf), fp) == NULL)
192 break;
193
194 /* ensure null termination since stack will be reused. */
195 strcpy(execname, "");
196
197 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */
198 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
199 &event->mmap.start, &event->mmap.len, prot,
200 &event->mmap.pgoff,
201 execname);
202 /*
203 * Anon maps don't have the execname.
204 */
205 if (n < 4)
206 continue;
207 /*
208 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
209 */
210 if (machine__is_host(machine))
211 event->header.misc = PERF_RECORD_MISC_USER;
212 else
213 event->header.misc = PERF_RECORD_MISC_GUEST_USER;
214
215 if (prot[2] != 'x') {
216 if (!mmap_data || prot[0] != 'r')
217 continue;
218
219 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
220 }
221
222 if (!strcmp(execname, ""))
223 strcpy(execname, anonstr);
224
225 size = strlen(execname) + 1;
226 memcpy(event->mmap.filename, execname, size);
227 size = PERF_ALIGN(size, sizeof(u64));
228 event->mmap.len -= event->mmap.start;
229 event->mmap.header.size = (sizeof(event->mmap) -
230 (sizeof(event->mmap.filename) - size));
231 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
232 event->mmap.header.size += machine->id_hdr_size;
233 event->mmap.pid = tgid;
234 event->mmap.tid = pid;
235
236 if (process(tool, event, &synth_sample, machine) != 0) {
237 rc = -1;
238 break;
239 }
240 }
241
242 fclose(fp);
243 return rc;
244 }
245
246 int perf_event__synthesize_modules(struct perf_tool *tool,
247 perf_event__handler_t process,
248 struct machine *machine)
249 {
250 int rc = 0;
251 struct rb_node *nd;
252 struct map_groups *kmaps = &machine->kmaps;
253 union perf_event *event = zalloc((sizeof(event->mmap) +
254 machine->id_hdr_size));
255 if (event == NULL) {
256 pr_debug("Not enough memory synthesizing mmap event "
257 "for kernel modules\n");
258 return -1;
259 }
260
261 event->header.type = PERF_RECORD_MMAP;
262
263 /*
264 * kernel uses 0 for user space maps, see kernel/perf_event.c
265 * __perf_event_mmap
266 */
267 if (machine__is_host(machine))
268 event->header.misc = PERF_RECORD_MISC_KERNEL;
269 else
270 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
271
272 for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
273 nd; nd = rb_next(nd)) {
274 size_t size;
275 struct map *pos = rb_entry(nd, struct map, rb_node);
276
277 if (pos->dso->kernel)
278 continue;
279
280 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
281 event->mmap.header.type = PERF_RECORD_MMAP;
282 event->mmap.header.size = (sizeof(event->mmap) -
283 (sizeof(event->mmap.filename) - size));
284 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
285 event->mmap.header.size += machine->id_hdr_size;
286 event->mmap.start = pos->start;
287 event->mmap.len = pos->end - pos->start;
288 event->mmap.pid = machine->pid;
289
290 memcpy(event->mmap.filename, pos->dso->long_name,
291 pos->dso->long_name_len + 1);
292 if (process(tool, event, &synth_sample, machine) != 0) {
293 rc = -1;
294 break;
295 }
296 }
297
298 free(event);
299 return rc;
300 }
301
302 static int __event__synthesize_thread(union perf_event *comm_event,
303 union perf_event *mmap_event,
304 union perf_event *fork_event,
305 pid_t pid, int full,
306 perf_event__handler_t process,
307 struct perf_tool *tool,
308 struct machine *machine, bool mmap_data)
309 {
310 char filename[PATH_MAX];
311 DIR *tasks;
312 struct dirent dirent, *next;
313 pid_t tgid;
314
315 /* special case: only send one comm event using passed in pid */
316 if (!full) {
317 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
318 process, machine);
319
320 if (tgid == -1)
321 return -1;
322
323 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
324 process, machine, mmap_data);
325 }
326
327 if (machine__is_default_guest(machine))
328 return 0;
329
330 snprintf(filename, sizeof(filename), "%s/proc/%d/task",
331 machine->root_dir, pid);
332
333 tasks = opendir(filename);
334 if (tasks == NULL) {
335 pr_debug("couldn't open %s\n", filename);
336 return 0;
337 }
338
339 while (!readdir_r(tasks, &dirent, &next) && next) {
340 char *end;
341 int rc = 0;
342 pid_t _pid;
343
344 _pid = strtol(dirent.d_name, &end, 10);
345 if (*end)
346 continue;
347
348 tgid = perf_event__synthesize_comm(tool, comm_event, _pid,
349 process, machine);
350 if (tgid == -1)
351 return -1;
352
353 if (_pid == pid) {
354 /* process the parent's maps too */
355 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
356 process, machine, mmap_data);
357 } else {
358 /* only fork the tid's map, to save time */
359 rc = perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
360 process, machine);
361 }
362
363 if (rc)
364 return rc;
365 }
366
367 closedir(tasks);
368 return 0;
369 }
370
371 int perf_event__synthesize_thread_map(struct perf_tool *tool,
372 struct thread_map *threads,
373 perf_event__handler_t process,
374 struct machine *machine,
375 bool mmap_data)
376 {
377 union perf_event *comm_event, *mmap_event, *fork_event;
378 int err = -1, thread, j;
379
380 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
381 if (comm_event == NULL)
382 goto out;
383
384 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
385 if (mmap_event == NULL)
386 goto out_free_comm;
387
388 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
389 if (fork_event == NULL)
390 goto out_free_mmap;
391
392 err = 0;
393 for (thread = 0; thread < threads->nr; ++thread) {
394 if (__event__synthesize_thread(comm_event, mmap_event,
395 fork_event,
396 threads->map[thread], 0,
397 process, tool, machine,
398 mmap_data)) {
399 err = -1;
400 break;
401 }
402
403 /*
404 * comm.pid is set to thread group id by
405 * perf_event__synthesize_comm
406 */
407 if ((int) comm_event->comm.pid != threads->map[thread]) {
408 bool need_leader = true;
409
410 /* is thread group leader in thread_map? */
411 for (j = 0; j < threads->nr; ++j) {
412 if ((int) comm_event->comm.pid == threads->map[j]) {
413 need_leader = false;
414 break;
415 }
416 }
417
418 /* if not, generate events for it */
419 if (need_leader &&
420 __event__synthesize_thread(comm_event, mmap_event,
421 fork_event,
422 comm_event->comm.pid, 0,
423 process, tool, machine,
424 mmap_data)) {
425 err = -1;
426 break;
427 }
428 }
429 }
430 free(fork_event);
431 out_free_mmap:
432 free(mmap_event);
433 out_free_comm:
434 free(comm_event);
435 out:
436 return err;
437 }
438
439 int perf_event__synthesize_threads(struct perf_tool *tool,
440 perf_event__handler_t process,
441 struct machine *machine, bool mmap_data)
442 {
443 DIR *proc;
444 char proc_path[PATH_MAX];
445 struct dirent dirent, *next;
446 union perf_event *comm_event, *mmap_event, *fork_event;
447 int err = -1;
448
449 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
450 if (comm_event == NULL)
451 goto out;
452
453 mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
454 if (mmap_event == NULL)
455 goto out_free_comm;
456
457 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
458 if (fork_event == NULL)
459 goto out_free_mmap;
460
461 if (machine__is_default_guest(machine))
462 return 0;
463
464 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
465 proc = opendir(proc_path);
466
467 if (proc == NULL)
468 goto out_free_fork;
469
470 while (!readdir_r(proc, &dirent, &next) && next) {
471 char *end;
472 pid_t pid = strtol(dirent.d_name, &end, 10);
473
474 if (*end) /* only interested in proper numerical dirents */
475 continue;
476 /*
477 * We may race with exiting thread, so don't stop just because
478 * one thread couldn't be synthesized.
479 */
480 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
481 1, process, tool, machine, mmap_data);
482 }
483
484 err = 0;
485 closedir(proc);
486 out_free_fork:
487 free(fork_event);
488 out_free_mmap:
489 free(mmap_event);
490 out_free_comm:
491 free(comm_event);
492 out:
493 return err;
494 }
495
496 struct process_symbol_args {
497 const char *name;
498 u64 start;
499 };
500
501 static int find_symbol_cb(void *arg, const char *name, char type,
502 u64 start)
503 {
504 struct process_symbol_args *args = arg;
505
506 /*
507 * Must be a function or at least an alias, as in PARISC64, where "_text" is
508 * an 'A' to the same address as "_stext".
509 */
510 if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
511 type == 'A') || strcmp(name, args->name))
512 return 0;
513
514 args->start = start;
515 return 1;
516 }
517
518 u64 kallsyms__get_function_start(const char *kallsyms_filename,
519 const char *symbol_name)
520 {
521 struct process_symbol_args args = { .name = symbol_name, };
522
523 if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
524 return 0;
525
526 return args.start;
527 }
528
529 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
530 perf_event__handler_t process,
531 struct machine *machine)
532 {
533 size_t size;
534 const char *mmap_name;
535 char name_buff[PATH_MAX];
536 struct map *map;
537 struct kmap *kmap;
538 int err;
539 /*
540 * We should get this from /sys/kernel/sections/.text, but till that is
541 * available use this, and after it is use this as a fallback for older
542 * kernels.
543 */
544 union perf_event *event = zalloc((sizeof(event->mmap) +
545 machine->id_hdr_size));
546 if (event == NULL) {
547 pr_debug("Not enough memory synthesizing mmap event "
548 "for kernel modules\n");
549 return -1;
550 }
551
552 mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
553 if (machine__is_host(machine)) {
554 /*
555 * kernel uses PERF_RECORD_MISC_USER for user space maps,
556 * see kernel/perf_event.c __perf_event_mmap
557 */
558 event->header.misc = PERF_RECORD_MISC_KERNEL;
559 } else {
560 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
561 }
562
563 map = machine->vmlinux_maps[MAP__FUNCTION];
564 kmap = map__kmap(map);
565 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
566 "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
567 size = PERF_ALIGN(size, sizeof(u64));
568 event->mmap.header.type = PERF_RECORD_MMAP;
569 event->mmap.header.size = (sizeof(event->mmap) -
570 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
571 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
572 event->mmap.start = map->start;
573 event->mmap.len = map->end - event->mmap.start;
574 event->mmap.pid = machine->pid;
575
576 err = process(tool, event, &synth_sample, machine);
577 free(event);
578
579 return err;
580 }
581
582 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
583 {
584 return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
585 }
586
587 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
588 union perf_event *event,
589 struct perf_sample *sample,
590 struct machine *machine)
591 {
592 return machine__process_comm_event(machine, event, sample);
593 }
594
595 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
596 union perf_event *event,
597 struct perf_sample *sample,
598 struct machine *machine)
599 {
600 return machine__process_lost_event(machine, event, sample);
601 }
602
603 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
604 {
605 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
606 event->mmap.pid, event->mmap.tid, event->mmap.start,
607 event->mmap.len, event->mmap.pgoff,
608 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
609 event->mmap.filename);
610 }
611
612 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
613 {
614 return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
615 " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
616 event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
617 event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
618 event->mmap2.min, event->mmap2.ino,
619 event->mmap2.ino_generation,
620 (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
621 event->mmap2.filename);
622 }
623
624 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
625 union perf_event *event,
626 struct perf_sample *sample,
627 struct machine *machine)
628 {
629 return machine__process_mmap_event(machine, event, sample);
630 }
631
632 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
633 union perf_event *event,
634 struct perf_sample *sample,
635 struct machine *machine)
636 {
637 return machine__process_mmap2_event(machine, event, sample);
638 }
639
640 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
641 {
642 return fprintf(fp, "(%d:%d):(%d:%d)\n",
643 event->fork.pid, event->fork.tid,
644 event->fork.ppid, event->fork.ptid);
645 }
646
647 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
648 union perf_event *event,
649 struct perf_sample *sample,
650 struct machine *machine)
651 {
652 return machine__process_fork_event(machine, event, sample);
653 }
654
655 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
656 union perf_event *event,
657 struct perf_sample *sample,
658 struct machine *machine)
659 {
660 return machine__process_exit_event(machine, event, sample);
661 }
662
663 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
664 {
665 size_t ret = fprintf(fp, "PERF_RECORD_%s",
666 perf_event__name(event->header.type));
667
668 switch (event->header.type) {
669 case PERF_RECORD_COMM:
670 ret += perf_event__fprintf_comm(event, fp);
671 break;
672 case PERF_RECORD_FORK:
673 case PERF_RECORD_EXIT:
674 ret += perf_event__fprintf_task(event, fp);
675 break;
676 case PERF_RECORD_MMAP:
677 ret += perf_event__fprintf_mmap(event, fp);
678 break;
679 case PERF_RECORD_MMAP2:
680 ret += perf_event__fprintf_mmap2(event, fp);
681 break;
682 default:
683 ret += fprintf(fp, "\n");
684 }
685
686 return ret;
687 }
688
689 int perf_event__process(struct perf_tool *tool __maybe_unused,
690 union perf_event *event,
691 struct perf_sample *sample,
692 struct machine *machine)
693 {
694 return machine__process_event(machine, event, sample);
695 }
696
697 void thread__find_addr_map(struct thread *thread,
698 struct machine *machine, u8 cpumode,
699 enum map_type type, u64 addr,
700 struct addr_location *al)
701 {
702 struct map_groups *mg = &thread->mg;
703 bool load_map = false;
704
705 al->machine = machine;
706 al->thread = thread;
707 al->addr = addr;
708 al->cpumode = cpumode;
709 al->filtered = 0;
710
711 if (machine == NULL) {
712 al->map = NULL;
713 return;
714 }
715
716 if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
717 al->level = 'k';
718 mg = &machine->kmaps;
719 load_map = true;
720 } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
721 al->level = '.';
722 } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
723 al->level = 'g';
724 mg = &machine->kmaps;
725 load_map = true;
726 } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
727 al->level = 'u';
728 } else {
729 al->level = 'H';
730 al->map = NULL;
731
732 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
733 cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
734 !perf_guest)
735 al->filtered |= (1 << HIST_FILTER__GUEST);
736 if ((cpumode == PERF_RECORD_MISC_USER ||
737 cpumode == PERF_RECORD_MISC_KERNEL) &&
738 !perf_host)
739 al->filtered |= (1 << HIST_FILTER__HOST);
740
741 return;
742 }
743 try_again:
744 al->map = map_groups__find(mg, type, al->addr);
745 if (al->map == NULL) {
746 /*
747 * If this is outside of all known maps, and is a negative
748 * address, try to look it up in the kernel dso, as it might be
749 * a vsyscall or vdso (which executes in user-mode).
750 *
751 * XXX This is nasty, we should have a symbol list in the
752 * "[vdso]" dso, but for now lets use the old trick of looking
753 * in the whole kernel symbol list.
754 */
755 if ((long long)al->addr < 0 &&
756 cpumode == PERF_RECORD_MISC_USER &&
757 machine && mg != &machine->kmaps) {
758 mg = &machine->kmaps;
759 goto try_again;
760 }
761 } else {
762 /*
763 * Kernel maps might be changed when loading symbols so loading
764 * must be done prior to using kernel maps.
765 */
766 if (load_map)
767 map__load(al->map, machine->symbol_filter);
768 al->addr = al->map->map_ip(al->map, al->addr);
769 }
770 }
771
772 void thread__find_addr_location(struct thread *thread, struct machine *machine,
773 u8 cpumode, enum map_type type, u64 addr,
774 struct addr_location *al)
775 {
776 thread__find_addr_map(thread, machine, cpumode, type, addr, al);
777 if (al->map != NULL)
778 al->sym = map__find_symbol(al->map, al->addr,
779 machine->symbol_filter);
780 else
781 al->sym = NULL;
782 }
783
784 int perf_event__preprocess_sample(const union perf_event *event,
785 struct machine *machine,
786 struct addr_location *al,
787 struct perf_sample *sample)
788 {
789 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
790 struct thread *thread = machine__findnew_thread(machine, sample->pid,
791 sample->pid);
792
793 if (thread == NULL)
794 return -1;
795
796 if (thread__is_filtered(thread)) {
797 al->filtered |= (1 << HIST_FILTER__THREAD);
798 goto out_filtered;
799 }
800
801 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
802 /*
803 * Have we already created the kernel maps for this machine?
804 *
805 * This should have happened earlier, when we processed the kernel MMAP
806 * events, but for older perf.data files there was no such thing, so do
807 * it now.
808 */
809 if (cpumode == PERF_RECORD_MISC_KERNEL &&
810 machine->vmlinux_maps[MAP__FUNCTION] == NULL)
811 machine__create_kernel_maps(machine);
812
813 thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
814 sample->ip, al);
815 dump_printf(" ...... dso: %s\n",
816 al->map ? al->map->dso->long_name :
817 al->level == 'H' ? "[hypervisor]" : "<not found>");
818 al->sym = NULL;
819 al->cpu = sample->cpu;
820
821 if (al->map) {
822 struct dso *dso = al->map->dso;
823
824 if (symbol_conf.dso_list &&
825 (!dso || !(strlist__has_entry(symbol_conf.dso_list,
826 dso->short_name) ||
827 (dso->short_name != dso->long_name &&
828 strlist__has_entry(symbol_conf.dso_list,
829 dso->long_name))))) {
830 al->filtered |= (1 << HIST_FILTER__DSO);
831 goto out_filtered;
832 }
833
834 al->sym = map__find_symbol(al->map, al->addr,
835 machine->symbol_filter);
836 }
837
838 if (symbol_conf.sym_list &&
839 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
840 al->sym->name))) {
841 al->filtered |= (1 << HIST_FILTER__SYMBOL);
842 goto out_filtered;
843 }
844
845 return 0;
846
847 out_filtered:
848 return 0;
849 }
Linux kernel - Deliverables
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