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

Version: ~ [ linux-5.6-rc7 ] ~ [ linux-5.5.11 ] ~ [ linux-5.4.27 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.112 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ 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-3.16.82 ] ~ [ 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 "sort.h"
  5 #include "string.h"
  6 #include "strlist.h"
  7 #include "thread.h"
  8 #include "thread_map.h"
  9 
 10 static const char *perf_event__names[] = {
 11         [0]                                     = "TOTAL",
 12         [PERF_RECORD_MMAP]                      = "MMAP",
 13         [PERF_RECORD_LOST]                      = "LOST",
 14         [PERF_RECORD_COMM]                      = "COMM",
 15         [PERF_RECORD_EXIT]                      = "EXIT",
 16         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
 17         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
 18         [PERF_RECORD_FORK]                      = "FORK",
 19         [PERF_RECORD_READ]                      = "READ",
 20         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
 21         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
 22         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
 23         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
 24         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
 25         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
 26 };
 27 
 28 const char *perf_event__name(unsigned int id)
 29 {
 30         if (id >= ARRAY_SIZE(perf_event__names))
 31                 return "INVALID";
 32         if (!perf_event__names[id])
 33                 return "UNKNOWN";
 34         return perf_event__names[id];
 35 }
 36 
 37 static struct perf_sample synth_sample = {
 38         .pid       = -1,
 39         .tid       = -1,
 40         .time      = -1,
 41         .stream_id = -1,
 42         .cpu       = -1,
 43         .period    = 1,
 44 };
 45 
 46 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
 47 {
 48         char filename[PATH_MAX];
 49         char bf[BUFSIZ];
 50         FILE *fp;
 51         size_t size = 0;
 52         pid_t tgid = -1;
 53 
 54         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
 55 
 56         fp = fopen(filename, "r");
 57         if (fp == NULL) {
 58                 pr_debug("couldn't open %s\n", filename);
 59                 return 0;
 60         }
 61 
 62         while (!comm[0] || (tgid < 0)) {
 63                 if (fgets(bf, sizeof(bf), fp) == NULL) {
 64                         pr_warning("couldn't get COMM and pgid, malformed %s\n",
 65                                    filename);
 66                         break;
 67                 }
 68 
 69                 if (memcmp(bf, "Name:", 5) == 0) {
 70                         char *name = bf + 5;
 71                         while (*name && isspace(*name))
 72                                 ++name;
 73                         size = strlen(name) - 1;
 74                         if (size >= len)
 75                                 size = len - 1;
 76                         memcpy(comm, name, size);
 77                         comm[size] = '\0';
 78 
 79                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
 80                         char *tgids = bf + 5;
 81                         while (*tgids && isspace(*tgids))
 82                                 ++tgids;
 83                         tgid = atoi(tgids);
 84                 }
 85         }
 86 
 87         fclose(fp);
 88 
 89         return tgid;
 90 }
 91 
 92 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 93                                          union perf_event *event, pid_t pid,
 94                                          int full,
 95                                          perf_event__handler_t process,
 96                                          struct machine *machine)
 97 {
 98         char filename[PATH_MAX];
 99         size_t size;
100         DIR *tasks;
101         struct dirent dirent, *next;
102         pid_t tgid;
103 
104         memset(&event->comm, 0, sizeof(event->comm));
105 
106         tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
107                                          sizeof(event->comm.comm));
108         if (tgid < 0)
109                 goto out;
110 
111         event->comm.pid = tgid;
112         event->comm.header.type = PERF_RECORD_COMM;
113 
114         size = strlen(event->comm.comm) + 1;
115         size = ALIGN(size, sizeof(u64));
116         memset(event->comm.comm + size, 0, machine->id_hdr_size);
117         event->comm.header.size = (sizeof(event->comm) -
118                                 (sizeof(event->comm.comm) - size) +
119                                 machine->id_hdr_size);
120         if (!full) {
121                 event->comm.tid = pid;
122 
123                 process(tool, event, &synth_sample, machine);
124                 goto out;
125         }
126 
127         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
128 
129         tasks = opendir(filename);
130         if (tasks == NULL) {
131                 pr_debug("couldn't open %s\n", filename);
132                 return 0;
133         }
134 
135         while (!readdir_r(tasks, &dirent, &next) && next) {
136                 char *end;
137                 pid = strtol(dirent.d_name, &end, 10);
138                 if (*end)
139                         continue;
140 
141                 /* already have tgid; jut want to update the comm */
142                 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
143                                          sizeof(event->comm.comm));
144 
145                 size = strlen(event->comm.comm) + 1;
146                 size = ALIGN(size, sizeof(u64));
147                 memset(event->comm.comm + size, 0, machine->id_hdr_size);
148                 event->comm.header.size = (sizeof(event->comm) -
149                                           (sizeof(event->comm.comm) - size) +
150                                           machine->id_hdr_size);
151 
152                 event->comm.tid = pid;
153 
154                 process(tool, event, &synth_sample, machine);
155         }
156 
157         closedir(tasks);
158 out:
159         return tgid;
160 }
161 
162 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
163                                               union perf_event *event,
164                                               pid_t pid, pid_t tgid,
165                                               perf_event__handler_t process,
166                                               struct machine *machine)
167 {
168         char filename[PATH_MAX];
169         FILE *fp;
170 
171         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
172 
173         fp = fopen(filename, "r");
174         if (fp == NULL) {
175                 /*
176                  * We raced with a task exiting - just return:
177                  */
178                 pr_debug("couldn't open %s\n", filename);
179                 return -1;
180         }
181 
182         event->header.type = PERF_RECORD_MMAP;
183         /*
184          * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
185          */
186         event->header.misc = PERF_RECORD_MISC_USER;
187 
188         while (1) {
189                 char bf[BUFSIZ], *pbf = bf;
190                 int n;
191                 size_t size;
192                 if (fgets(bf, sizeof(bf), fp) == NULL)
193                         break;
194 
195                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
196                 n = hex2u64(pbf, &event->mmap.start);
197                 if (n < 0)
198                         continue;
199                 pbf += n + 1;
200                 n = hex2u64(pbf, &event->mmap.len);
201                 if (n < 0)
202                         continue;
203                 pbf += n + 3;
204                 if (*pbf == 'x') { /* vm_exec */
205                         char anonstr[] = "//anon\n";
206                         char *execname = strchr(bf, '/');
207 
208                         /* Catch VDSO */
209                         if (execname == NULL)
210                                 execname = strstr(bf, "[vdso]");
211 
212                         /* Catch anonymous mmaps */
213                         if ((execname == NULL) && !strstr(bf, "["))
214                                 execname = anonstr;
215 
216                         if (execname == NULL)
217                                 continue;
218 
219                         pbf += 3;
220                         n = hex2u64(pbf, &event->mmap.pgoff);
221 
222                         size = strlen(execname);
223                         execname[size - 1] = '\0'; /* Remove \n */
224                         memcpy(event->mmap.filename, execname, size);
225                         size = ALIGN(size, sizeof(u64));
226                         event->mmap.len -= event->mmap.start;
227                         event->mmap.header.size = (sizeof(event->mmap) -
228                                                 (sizeof(event->mmap.filename) - size));
229                         memset(event->mmap.filename + size, 0, machine->id_hdr_size);
230                         event->mmap.header.size += machine->id_hdr_size;
231                         event->mmap.pid = tgid;
232                         event->mmap.tid = pid;
233 
234                         process(tool, event, &synth_sample, machine);
235                 }
236         }
237 
238         fclose(fp);
239         return 0;
240 }
241 
242 int perf_event__synthesize_modules(struct perf_tool *tool,
243                                    perf_event__handler_t process,
244                                    struct machine *machine)
245 {
246         struct rb_node *nd;
247         struct map_groups *kmaps = &machine->kmaps;
248         union perf_event *event = zalloc((sizeof(event->mmap) +
249                                           machine->id_hdr_size));
250         if (event == NULL) {
251                 pr_debug("Not enough memory synthesizing mmap event "
252                          "for kernel modules\n");
253                 return -1;
254         }
255 
256         event->header.type = PERF_RECORD_MMAP;
257 
258         /*
259          * kernel uses 0 for user space maps, see kernel/perf_event.c
260          * __perf_event_mmap
261          */
262         if (machine__is_host(machine))
263                 event->header.misc = PERF_RECORD_MISC_KERNEL;
264         else
265                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
266 
267         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
268              nd; nd = rb_next(nd)) {
269                 size_t size;
270                 struct map *pos = rb_entry(nd, struct map, rb_node);
271 
272                 if (pos->dso->kernel)
273                         continue;
274 
275                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
276                 event->mmap.header.type = PERF_RECORD_MMAP;
277                 event->mmap.header.size = (sizeof(event->mmap) -
278                                         (sizeof(event->mmap.filename) - size));
279                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
280                 event->mmap.header.size += machine->id_hdr_size;
281                 event->mmap.start = pos->start;
282                 event->mmap.len   = pos->end - pos->start;
283                 event->mmap.pid   = machine->pid;
284 
285                 memcpy(event->mmap.filename, pos->dso->long_name,
286                        pos->dso->long_name_len + 1);
287                 process(tool, event, &synth_sample, machine);
288         }
289 
290         free(event);
291         return 0;
292 }
293 
294 static int __event__synthesize_thread(union perf_event *comm_event,
295                                       union perf_event *mmap_event,
296                                       pid_t pid, int full,
297                                           perf_event__handler_t process,
298                                       struct perf_tool *tool,
299                                       struct machine *machine)
300 {
301         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
302                                                  process, machine);
303         if (tgid == -1)
304                 return -1;
305         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
306                                                   process, machine);
307 }
308 
309 int perf_event__synthesize_thread_map(struct perf_tool *tool,
310                                       struct thread_map *threads,
311                                       perf_event__handler_t process,
312                                       struct machine *machine)
313 {
314         union perf_event *comm_event, *mmap_event;
315         int err = -1, thread, j;
316 
317         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
318         if (comm_event == NULL)
319                 goto out;
320 
321         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
322         if (mmap_event == NULL)
323                 goto out_free_comm;
324 
325         err = 0;
326         for (thread = 0; thread < threads->nr; ++thread) {
327                 if (__event__synthesize_thread(comm_event, mmap_event,
328                                                threads->map[thread], 0,
329                                                process, tool, machine)) {
330                         err = -1;
331                         break;
332                 }
333 
334                 /*
335                  * comm.pid is set to thread group id by
336                  * perf_event__synthesize_comm
337                  */
338                 if ((int) comm_event->comm.pid != threads->map[thread]) {
339                         bool need_leader = true;
340 
341                         /* is thread group leader in thread_map? */
342                         for (j = 0; j < threads->nr; ++j) {
343                                 if ((int) comm_event->comm.pid == threads->map[j]) {
344                                         need_leader = false;
345                                         break;
346                                 }
347                         }
348 
349                         /* if not, generate events for it */
350                         if (need_leader &&
351                             __event__synthesize_thread(comm_event,
352                                                       mmap_event,
353                                                       comm_event->comm.pid, 0,
354                                                       process, tool, machine)) {
355                                 err = -1;
356                                 break;
357                         }
358                 }
359         }
360         free(mmap_event);
361 out_free_comm:
362         free(comm_event);
363 out:
364         return err;
365 }
366 
367 int perf_event__synthesize_threads(struct perf_tool *tool,
368                                    perf_event__handler_t process,
369                                    struct machine *machine)
370 {
371         DIR *proc;
372         struct dirent dirent, *next;
373         union perf_event *comm_event, *mmap_event;
374         int err = -1;
375 
376         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
377         if (comm_event == NULL)
378                 goto out;
379 
380         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
381         if (mmap_event == NULL)
382                 goto out_free_comm;
383 
384         proc = opendir("/proc");
385         if (proc == NULL)
386                 goto out_free_mmap;
387 
388         while (!readdir_r(proc, &dirent, &next) && next) {
389                 char *end;
390                 pid_t pid = strtol(dirent.d_name, &end, 10);
391 
392                 if (*end) /* only interested in proper numerical dirents */
393                         continue;
394 
395                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
396                                            process, tool, machine);
397         }
398 
399         closedir(proc);
400         err = 0;
401 out_free_mmap:
402         free(mmap_event);
403 out_free_comm:
404         free(comm_event);
405 out:
406         return err;
407 }
408 
409 struct process_symbol_args {
410         const char *name;
411         u64        start;
412 };
413 
414 static int find_symbol_cb(void *arg, const char *name, char type,
415                           u64 start, u64 end __used)
416 {
417         struct process_symbol_args *args = arg;
418 
419         /*
420          * Must be a function or at least an alias, as in PARISC64, where "_text" is
421          * an 'A' to the same address as "_stext".
422          */
423         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
424               type == 'A') || strcmp(name, args->name))
425                 return 0;
426 
427         args->start = start;
428         return 1;
429 }
430 
431 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
432                                        perf_event__handler_t process,
433                                        struct machine *machine,
434                                        const char *symbol_name)
435 {
436         size_t size;
437         const char *filename, *mmap_name;
438         char path[PATH_MAX];
439         char name_buff[PATH_MAX];
440         struct map *map;
441         int err;
442         /*
443          * We should get this from /sys/kernel/sections/.text, but till that is
444          * available use this, and after it is use this as a fallback for older
445          * kernels.
446          */
447         struct process_symbol_args args = { .name = symbol_name, };
448         union perf_event *event = zalloc((sizeof(event->mmap) +
449                                           machine->id_hdr_size));
450         if (event == NULL) {
451                 pr_debug("Not enough memory synthesizing mmap event "
452                          "for kernel modules\n");
453                 return -1;
454         }
455 
456         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
457         if (machine__is_host(machine)) {
458                 /*
459                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
460                  * see kernel/perf_event.c __perf_event_mmap
461                  */
462                 event->header.misc = PERF_RECORD_MISC_KERNEL;
463                 filename = "/proc/kallsyms";
464         } else {
465                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
466                 if (machine__is_default_guest(machine))
467                         filename = (char *) symbol_conf.default_guest_kallsyms;
468                 else {
469                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
470                         filename = path;
471                 }
472         }
473 
474         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
475                 return -ENOENT;
476 
477         map = machine->vmlinux_maps[MAP__FUNCTION];
478         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
479                         "%s%s", mmap_name, symbol_name) + 1;
480         size = ALIGN(size, sizeof(u64));
481         event->mmap.header.type = PERF_RECORD_MMAP;
482         event->mmap.header.size = (sizeof(event->mmap) -
483                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
484         event->mmap.pgoff = args.start;
485         event->mmap.start = map->start;
486         event->mmap.len   = map->end - event->mmap.start;
487         event->mmap.pid   = machine->pid;
488 
489         err = process(tool, event, &synth_sample, machine);
490         free(event);
491 
492         return err;
493 }
494 
495 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
496 {
497         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
498 }
499 
500 int perf_event__process_comm(struct perf_tool *tool __used,
501                              union perf_event *event,
502                              struct perf_sample *sample __used,
503                              struct machine *machine)
504 {
505         struct thread *thread = machine__findnew_thread(machine, event->comm.tid);
506 
507         if (dump_trace)
508                 perf_event__fprintf_comm(event, stdout);
509 
510         if (thread == NULL || thread__set_comm(thread, event->comm.comm)) {
511                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
512                 return -1;
513         }
514 
515         return 0;
516 }
517 
518 int perf_event__process_lost(struct perf_tool *tool __used,
519                              union perf_event *event,
520                              struct perf_sample *sample __used,
521                              struct machine *machine __used)
522 {
523         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
524                     event->lost.id, event->lost.lost);
525         return 0;
526 }
527 
528 static void perf_event__set_kernel_mmap_len(union perf_event *event,
529                                             struct map **maps)
530 {
531         maps[MAP__FUNCTION]->start = event->mmap.start;
532         maps[MAP__FUNCTION]->end   = event->mmap.start + event->mmap.len;
533         /*
534          * Be a bit paranoid here, some perf.data file came with
535          * a zero sized synthesized MMAP event for the kernel.
536          */
537         if (maps[MAP__FUNCTION]->end == 0)
538                 maps[MAP__FUNCTION]->end = ~0ULL;
539 }
540 
541 static int perf_event__process_kernel_mmap(struct perf_tool *tool __used,
542                                            union perf_event *event,
543                                            struct machine *machine)
544 {
545         struct map *map;
546         char kmmap_prefix[PATH_MAX];
547         enum dso_kernel_type kernel_type;
548         bool is_kernel_mmap;
549 
550         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
551         if (machine__is_host(machine))
552                 kernel_type = DSO_TYPE_KERNEL;
553         else
554                 kernel_type = DSO_TYPE_GUEST_KERNEL;
555 
556         is_kernel_mmap = memcmp(event->mmap.filename,
557                                 kmmap_prefix,
558                                 strlen(kmmap_prefix) - 1) == 0;
559         if (event->mmap.filename[0] == '/' ||
560             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
561 
562                 char short_module_name[1024];
563                 char *name, *dot;
564 
565                 if (event->mmap.filename[0] == '/') {
566                         name = strrchr(event->mmap.filename, '/');
567                         if (name == NULL)
568                                 goto out_problem;
569 
570                         ++name; /* skip / */
571                         dot = strrchr(name, '.');
572                         if (dot == NULL)
573                                 goto out_problem;
574                         snprintf(short_module_name, sizeof(short_module_name),
575                                         "[%.*s]", (int)(dot - name), name);
576                         strxfrchar(short_module_name, '-', '_');
577                 } else
578                         strcpy(short_module_name, event->mmap.filename);
579 
580                 map = machine__new_module(machine, event->mmap.start,
581                                           event->mmap.filename);
582                 if (map == NULL)
583                         goto out_problem;
584 
585                 name = strdup(short_module_name);
586                 if (name == NULL)
587                         goto out_problem;
588 
589                 map->dso->short_name = name;
590                 map->dso->sname_alloc = 1;
591                 map->end = map->start + event->mmap.len;
592         } else if (is_kernel_mmap) {
593                 const char *symbol_name = (event->mmap.filename +
594                                 strlen(kmmap_prefix));
595                 /*
596                  * Should be there already, from the build-id table in
597                  * the header.
598                  */
599                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
600                                                      kmmap_prefix);
601                 if (kernel == NULL)
602                         goto out_problem;
603 
604                 kernel->kernel = kernel_type;
605                 if (__machine__create_kernel_maps(machine, kernel) < 0)
606                         goto out_problem;
607 
608                 perf_event__set_kernel_mmap_len(event, machine->vmlinux_maps);
609 
610                 /*
611                  * Avoid using a zero address (kptr_restrict) for the ref reloc
612                  * symbol. Effectively having zero here means that at record
613                  * time /proc/sys/kernel/kptr_restrict was non zero.
614                  */
615                 if (event->mmap.pgoff != 0) {
616                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
617                                                          symbol_name,
618                                                          event->mmap.pgoff);
619                 }
620 
621                 if (machine__is_default_guest(machine)) {
622                         /*
623                          * preload dso of guest kernel and modules
624                          */
625                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
626                                   NULL);
627                 }
628         }
629         return 0;
630 out_problem:
631         return -1;
632 }
633 
634 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
635 {
636         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
637                        event->mmap.pid, event->mmap.tid, event->mmap.start,
638                        event->mmap.len, event->mmap.pgoff, event->mmap.filename);
639 }
640 
641 int perf_event__process_mmap(struct perf_tool *tool,
642                              union perf_event *event,
643                              struct perf_sample *sample __used,
644                              struct machine *machine)
645 {
646         struct thread *thread;
647         struct map *map;
648         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
649         int ret = 0;
650 
651         if (dump_trace)
652                 perf_event__fprintf_mmap(event, stdout);
653 
654         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
655             cpumode == PERF_RECORD_MISC_KERNEL) {
656                 ret = perf_event__process_kernel_mmap(tool, event, machine);
657                 if (ret < 0)
658                         goto out_problem;
659                 return 0;
660         }
661 
662         thread = machine__findnew_thread(machine, event->mmap.pid);
663         if (thread == NULL)
664                 goto out_problem;
665         map = map__new(&machine->user_dsos, event->mmap.start,
666                         event->mmap.len, event->mmap.pgoff,
667                         event->mmap.pid, event->mmap.filename,
668                         MAP__FUNCTION);
669         if (map == NULL)
670                 goto out_problem;
671 
672         thread__insert_map(thread, map);
673         return 0;
674 
675 out_problem:
676         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
677         return 0;
678 }
679 
680 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
681 {
682         return fprintf(fp, "(%d:%d):(%d:%d)\n",
683                        event->fork.pid, event->fork.tid,
684                        event->fork.ppid, event->fork.ptid);
685 }
686 
687 int perf_event__process_task(struct perf_tool *tool __used,
688                              union perf_event *event,
689                              struct perf_sample *sample __used,
690                               struct machine *machine)
691 {
692         struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
693         struct thread *parent = machine__findnew_thread(machine, event->fork.ptid);
694 
695         if (dump_trace)
696                 perf_event__fprintf_task(event, stdout);
697 
698         if (event->header.type == PERF_RECORD_EXIT) {
699                 machine__remove_thread(machine, thread);
700                 return 0;
701         }
702 
703         if (thread == NULL || parent == NULL ||
704             thread__fork(thread, parent) < 0) {
705                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
706                 return -1;
707         }
708 
709         return 0;
710 }
711 
712 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
713 {
714         size_t ret = fprintf(fp, "PERF_RECORD_%s",
715                              perf_event__name(event->header.type));
716 
717         switch (event->header.type) {
718         case PERF_RECORD_COMM:
719                 ret += perf_event__fprintf_comm(event, fp);
720                 break;
721         case PERF_RECORD_FORK:
722         case PERF_RECORD_EXIT:
723                 ret += perf_event__fprintf_task(event, fp);
724                 break;
725         case PERF_RECORD_MMAP:
726                 ret += perf_event__fprintf_mmap(event, fp);
727                 break;
728         default:
729                 ret += fprintf(fp, "\n");
730         }
731 
732         return ret;
733 }
734 
735 int perf_event__process(struct perf_tool *tool, union perf_event *event,
736                         struct perf_sample *sample, struct machine *machine)
737 {
738         switch (event->header.type) {
739         case PERF_RECORD_COMM:
740                 perf_event__process_comm(tool, event, sample, machine);
741                 break;
742         case PERF_RECORD_MMAP:
743                 perf_event__process_mmap(tool, event, sample, machine);
744                 break;
745         case PERF_RECORD_FORK:
746         case PERF_RECORD_EXIT:
747                 perf_event__process_task(tool, event, sample, machine);
748                 break;
749         case PERF_RECORD_LOST:
750                 perf_event__process_lost(tool, event, sample, machine);
751         default:
752                 break;
753         }
754 
755         return 0;
756 }
757 
758 void thread__find_addr_map(struct thread *self,
759                            struct machine *machine, u8 cpumode,
760                            enum map_type type, u64 addr,
761                            struct addr_location *al)
762 {
763         struct map_groups *mg = &self->mg;
764 
765         al->thread = self;
766         al->addr = addr;
767         al->cpumode = cpumode;
768         al->filtered = false;
769 
770         if (machine == NULL) {
771                 al->map = NULL;
772                 return;
773         }
774 
775         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
776                 al->level = 'k';
777                 mg = &machine->kmaps;
778         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
779                 al->level = '.';
780         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
781                 al->level = 'g';
782                 mg = &machine->kmaps;
783         } else {
784                 /*
785                  * 'u' means guest os user space.
786                  * TODO: We don't support guest user space. Might support late.
787                  */
788                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
789                         al->level = 'u';
790                 else
791                         al->level = 'H';
792                 al->map = NULL;
793 
794                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
795                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
796                         !perf_guest)
797                         al->filtered = true;
798                 if ((cpumode == PERF_RECORD_MISC_USER ||
799                         cpumode == PERF_RECORD_MISC_KERNEL) &&
800                         !perf_host)
801                         al->filtered = true;
802 
803                 return;
804         }
805 try_again:
806         al->map = map_groups__find(mg, type, al->addr);
807         if (al->map == NULL) {
808                 /*
809                  * If this is outside of all known maps, and is a negative
810                  * address, try to look it up in the kernel dso, as it might be
811                  * a vsyscall or vdso (which executes in user-mode).
812                  *
813                  * XXX This is nasty, we should have a symbol list in the
814                  * "[vdso]" dso, but for now lets use the old trick of looking
815                  * in the whole kernel symbol list.
816                  */
817                 if ((long long)al->addr < 0 &&
818                     cpumode == PERF_RECORD_MISC_USER &&
819                     machine && mg != &machine->kmaps) {
820                         mg = &machine->kmaps;
821                         goto try_again;
822                 }
823         } else
824                 al->addr = al->map->map_ip(al->map, al->addr);
825 }
826 
827 void thread__find_addr_location(struct thread *thread, struct machine *machine,
828                                 u8 cpumode, enum map_type type, u64 addr,
829                                 struct addr_location *al,
830                                 symbol_filter_t filter)
831 {
832         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
833         if (al->map != NULL)
834                 al->sym = map__find_symbol(al->map, al->addr, filter);
835         else
836                 al->sym = NULL;
837 }
838 
839 int perf_event__preprocess_sample(const union perf_event *event,
840                                   struct machine *machine,
841                                   struct addr_location *al,
842                                   struct perf_sample *sample,
843                                   symbol_filter_t filter)
844 {
845         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
846         struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
847 
848         if (thread == NULL)
849                 return -1;
850 
851         if (symbol_conf.comm_list &&
852             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
853                 goto out_filtered;
854 
855         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
856         /*
857          * Have we already created the kernel maps for this machine?
858          *
859          * This should have happened earlier, when we processed the kernel MMAP
860          * events, but for older perf.data files there was no such thing, so do
861          * it now.
862          */
863         if (cpumode == PERF_RECORD_MISC_KERNEL &&
864             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
865                 machine__create_kernel_maps(machine);
866 
867         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
868                               event->ip.ip, al);
869         dump_printf(" ...... dso: %s\n",
870                     al->map ? al->map->dso->long_name :
871                         al->level == 'H' ? "[hypervisor]" : "<not found>");
872         al->sym = NULL;
873         al->cpu = sample->cpu;
874 
875         if (al->map) {
876                 struct dso *dso = al->map->dso;
877 
878                 if (symbol_conf.dso_list &&
879                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
880                                                   dso->short_name) ||
881                                (dso->short_name != dso->long_name &&
882                                 strlist__has_entry(symbol_conf.dso_list,
883                                                    dso->long_name)))))
884                         goto out_filtered;
885 
886                 al->sym = map__find_symbol(al->map, al->addr, filter);
887         }
888 
889         if (symbol_conf.sym_list && al->sym &&
890             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
891                 goto out_filtered;
892 
893         return 0;
894 
895 out_filtered:
896         al->filtered = true;
897         return 0;
898 }
899 

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