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TOMOYO Linux Cross Reference
Linux/tools/perf/util/event.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.76 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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