13 #include <symbol/kallsyms.h>
15 #include "linux/hash.h"
17 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
19 static void dsos__init(struct dsos *dsos)
21 INIT_LIST_HEAD(&dsos->head);
23 pthread_rwlock_init(&dsos->lock, NULL);
26 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
28 map_groups__init(&machine->kmaps, machine);
29 RB_CLEAR_NODE(&machine->rb_node);
30 dsos__init(&machine->dsos);
32 machine->threads = RB_ROOT;
33 pthread_rwlock_init(&machine->threads_lock, NULL);
34 INIT_LIST_HEAD(&machine->dead_threads);
35 machine->last_match = NULL;
37 machine->vdso_info = NULL;
41 machine->symbol_filter = NULL;
42 machine->id_hdr_size = 0;
43 machine->comm_exec = false;
44 machine->kernel_start = 0;
46 machine->root_dir = strdup(root_dir);
47 if (machine->root_dir == NULL)
50 if (pid != HOST_KERNEL_ID) {
51 struct thread *thread = machine__findnew_thread(machine, -1,
58 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
59 thread__set_comm(thread, comm, 0);
63 machine->current_tid = NULL;
68 struct machine *machine__new_host(void)
70 struct machine *machine = malloc(sizeof(*machine));
72 if (machine != NULL) {
73 machine__init(machine, "", HOST_KERNEL_ID);
75 if (machine__create_kernel_maps(machine) < 0)
85 static void dsos__purge(struct dsos *dsos)
89 pthread_rwlock_wrlock(&dsos->lock);
91 list_for_each_entry_safe(pos, n, &dsos->head, node) {
92 RB_CLEAR_NODE(&pos->rb_node);
93 list_del_init(&pos->node);
97 pthread_rwlock_unlock(&dsos->lock);
100 static void dsos__exit(struct dsos *dsos)
103 pthread_rwlock_destroy(&dsos->lock);
106 void machine__delete_threads(struct machine *machine)
110 pthread_rwlock_wrlock(&machine->threads_lock);
111 nd = rb_first(&machine->threads);
113 struct thread *t = rb_entry(nd, struct thread, rb_node);
116 __machine__remove_thread(machine, t, false);
118 pthread_rwlock_unlock(&machine->threads_lock);
121 void machine__exit(struct machine *machine)
123 map_groups__exit(&machine->kmaps);
124 dsos__exit(&machine->dsos);
125 machine__exit_vdso(machine);
126 zfree(&machine->root_dir);
127 zfree(&machine->current_tid);
128 pthread_rwlock_destroy(&machine->threads_lock);
131 void machine__delete(struct machine *machine)
133 machine__exit(machine);
137 void machines__init(struct machines *machines)
139 machine__init(&machines->host, "", HOST_KERNEL_ID);
140 machines->guests = RB_ROOT;
141 machines->symbol_filter = NULL;
144 void machines__exit(struct machines *machines)
146 machine__exit(&machines->host);
150 struct machine *machines__add(struct machines *machines, pid_t pid,
151 const char *root_dir)
153 struct rb_node **p = &machines->guests.rb_node;
154 struct rb_node *parent = NULL;
155 struct machine *pos, *machine = malloc(sizeof(*machine));
160 if (machine__init(machine, root_dir, pid) != 0) {
165 machine->symbol_filter = machines->symbol_filter;
169 pos = rb_entry(parent, struct machine, rb_node);
176 rb_link_node(&machine->rb_node, parent, p);
177 rb_insert_color(&machine->rb_node, &machines->guests);
182 void machines__set_symbol_filter(struct machines *machines,
183 symbol_filter_t symbol_filter)
187 machines->symbol_filter = symbol_filter;
188 machines->host.symbol_filter = symbol_filter;
190 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
191 struct machine *machine = rb_entry(nd, struct machine, rb_node);
193 machine->symbol_filter = symbol_filter;
197 void machines__set_comm_exec(struct machines *machines, bool comm_exec)
201 machines->host.comm_exec = comm_exec;
203 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
204 struct machine *machine = rb_entry(nd, struct machine, rb_node);
206 machine->comm_exec = comm_exec;
210 struct machine *machines__find(struct machines *machines, pid_t pid)
212 struct rb_node **p = &machines->guests.rb_node;
213 struct rb_node *parent = NULL;
214 struct machine *machine;
215 struct machine *default_machine = NULL;
217 if (pid == HOST_KERNEL_ID)
218 return &machines->host;
222 machine = rb_entry(parent, struct machine, rb_node);
223 if (pid < machine->pid)
225 else if (pid > machine->pid)
230 default_machine = machine;
233 return default_machine;
236 struct machine *machines__findnew(struct machines *machines, pid_t pid)
239 const char *root_dir = "";
240 struct machine *machine = machines__find(machines, pid);
242 if (machine && (machine->pid == pid))
245 if ((pid != HOST_KERNEL_ID) &&
246 (pid != DEFAULT_GUEST_KERNEL_ID) &&
247 (symbol_conf.guestmount)) {
248 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
249 if (access(path, R_OK)) {
250 static struct strlist *seen;
253 seen = strlist__new(true, NULL);
255 if (!strlist__has_entry(seen, path)) {
256 pr_err("Can't access file %s\n", path);
257 strlist__add(seen, path);
265 machine = machines__add(machines, pid, root_dir);
270 void machines__process_guests(struct machines *machines,
271 machine__process_t process, void *data)
275 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
276 struct machine *pos = rb_entry(nd, struct machine, rb_node);
281 char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
283 if (machine__is_host(machine))
284 snprintf(bf, size, "[%s]", "kernel.kallsyms");
285 else if (machine__is_default_guest(machine))
286 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
288 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
295 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
297 struct rb_node *node;
298 struct machine *machine;
300 machines->host.id_hdr_size = id_hdr_size;
302 for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
303 machine = rb_entry(node, struct machine, rb_node);
304 machine->id_hdr_size = id_hdr_size;
310 static void machine__update_thread_pid(struct machine *machine,
311 struct thread *th, pid_t pid)
313 struct thread *leader;
315 if (pid == th->pid_ || pid == -1 || th->pid_ != -1)
320 if (th->pid_ == th->tid)
323 leader = __machine__findnew_thread(machine, th->pid_, th->pid_);
328 leader->mg = map_groups__new(machine);
333 if (th->mg == leader->mg)
338 * Maps are created from MMAP events which provide the pid and
339 * tid. Consequently there never should be any maps on a thread
340 * with an unknown pid. Just print an error if there are.
342 if (!map_groups__empty(th->mg))
343 pr_err("Discarding thread maps for %d:%d\n",
345 map_groups__put(th->mg);
348 th->mg = map_groups__get(leader->mg);
353 pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid);
356 static struct thread *____machine__findnew_thread(struct machine *machine,
357 pid_t pid, pid_t tid,
360 struct rb_node **p = &machine->threads.rb_node;
361 struct rb_node *parent = NULL;
365 * Front-end cache - TID lookups come in blocks,
366 * so most of the time we dont have to look up
369 th = machine->last_match;
371 if (th->tid == tid) {
372 machine__update_thread_pid(machine, th, pid);
376 machine->last_match = NULL;
381 th = rb_entry(parent, struct thread, rb_node);
383 if (th->tid == tid) {
384 machine->last_match = th;
385 machine__update_thread_pid(machine, th, pid);
398 th = thread__new(pid, tid);
400 rb_link_node(&th->rb_node, parent, p);
401 rb_insert_color(&th->rb_node, &machine->threads);
404 * We have to initialize map_groups separately
405 * after rb tree is updated.
407 * The reason is that we call machine__findnew_thread
408 * within thread__init_map_groups to find the thread
409 * leader and that would screwed the rb tree.
411 if (thread__init_map_groups(th, machine)) {
412 rb_erase_init(&th->rb_node, &machine->threads);
413 RB_CLEAR_NODE(&th->rb_node);
418 * It is now in the rbtree, get a ref
421 machine->last_match = th;
427 struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid)
429 return ____machine__findnew_thread(machine, pid, tid, true);
432 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
437 pthread_rwlock_wrlock(&machine->threads_lock);
438 th = thread__get(__machine__findnew_thread(machine, pid, tid));
439 pthread_rwlock_unlock(&machine->threads_lock);
443 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
447 pthread_rwlock_rdlock(&machine->threads_lock);
448 th = thread__get(____machine__findnew_thread(machine, pid, tid, false));
449 pthread_rwlock_unlock(&machine->threads_lock);
453 struct comm *machine__thread_exec_comm(struct machine *machine,
454 struct thread *thread)
456 if (machine->comm_exec)
457 return thread__exec_comm(thread);
459 return thread__comm(thread);
462 int machine__process_comm_event(struct machine *machine, union perf_event *event,
463 struct perf_sample *sample)
465 struct thread *thread = machine__findnew_thread(machine,
468 bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC;
472 machine->comm_exec = true;
475 perf_event__fprintf_comm(event, stdout);
477 if (thread == NULL ||
478 __thread__set_comm(thread, event->comm.comm, sample->time, exec)) {
479 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
488 int machine__process_lost_event(struct machine *machine __maybe_unused,
489 union perf_event *event, struct perf_sample *sample __maybe_unused)
491 dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
492 event->lost.id, event->lost.lost);
496 int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
497 union perf_event *event, struct perf_sample *sample)
499 dump_printf(": id:%" PRIu64 ": lost samples :%" PRIu64 "\n",
500 sample->id, event->lost_samples.lost);
504 static struct dso *machine__findnew_module_dso(struct machine *machine,
506 const char *filename)
510 pthread_rwlock_wrlock(&machine->dsos.lock);
512 dso = __dsos__find(&machine->dsos, m->name, true);
514 dso = __dsos__addnew(&machine->dsos, m->name);
518 if (machine__is_host(machine))
519 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
521 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
523 /* _KMODULE_COMP should be next to _KMODULE */
524 if (m->kmod && m->comp)
527 dso__set_short_name(dso, strdup(m->name), true);
528 dso__set_long_name(dso, strdup(filename), true);
533 pthread_rwlock_unlock(&machine->dsos.lock);
537 int machine__process_aux_event(struct machine *machine __maybe_unused,
538 union perf_event *event)
541 perf_event__fprintf_aux(event, stdout);
545 int machine__process_itrace_start_event(struct machine *machine __maybe_unused,
546 union perf_event *event)
549 perf_event__fprintf_itrace_start(event, stdout);
553 struct map *machine__findnew_module_map(struct machine *machine, u64 start,
554 const char *filename)
556 struct map *map = NULL;
560 if (kmod_path__parse_name(&m, filename))
563 map = map_groups__find_by_name(&machine->kmaps, MAP__FUNCTION,
568 dso = machine__findnew_module_dso(machine, &m, filename);
572 map = map__new2(start, dso, MAP__FUNCTION);
576 map_groups__insert(&machine->kmaps, map);
583 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
586 size_t ret = __dsos__fprintf(&machines->host.dsos.head, fp);
588 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
589 struct machine *pos = rb_entry(nd, struct machine, rb_node);
590 ret += __dsos__fprintf(&pos->dsos.head, fp);
596 size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp,
597 bool (skip)(struct dso *dso, int parm), int parm)
599 return __dsos__fprintf_buildid(&m->dsos.head, fp, skip, parm);
602 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
603 bool (skip)(struct dso *dso, int parm), int parm)
606 size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
608 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
609 struct machine *pos = rb_entry(nd, struct machine, rb_node);
610 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
615 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
619 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
621 if (kdso->has_build_id) {
622 char filename[PATH_MAX];
623 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
624 printed += fprintf(fp, "[0] %s\n", filename);
627 for (i = 0; i < vmlinux_path__nr_entries; ++i)
628 printed += fprintf(fp, "[%d] %s\n",
629 i + kdso->has_build_id, vmlinux_path[i]);
634 size_t machine__fprintf(struct machine *machine, FILE *fp)
639 pthread_rwlock_rdlock(&machine->threads_lock);
641 for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
642 struct thread *pos = rb_entry(nd, struct thread, rb_node);
644 ret += thread__fprintf(pos, fp);
647 pthread_rwlock_unlock(&machine->threads_lock);
652 static struct dso *machine__get_kernel(struct machine *machine)
654 const char *vmlinux_name = NULL;
657 if (machine__is_host(machine)) {
658 vmlinux_name = symbol_conf.vmlinux_name;
660 vmlinux_name = "[kernel.kallsyms]";
662 kernel = machine__findnew_kernel(machine, vmlinux_name,
663 "[kernel]", DSO_TYPE_KERNEL);
667 if (machine__is_default_guest(machine))
668 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
670 vmlinux_name = machine__mmap_name(machine, bf,
673 kernel = machine__findnew_kernel(machine, vmlinux_name,
675 DSO_TYPE_GUEST_KERNEL);
678 if (kernel != NULL && (!kernel->has_build_id))
679 dso__read_running_kernel_build_id(kernel, machine);
684 struct process_args {
688 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
691 if (machine__is_default_guest(machine))
692 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
694 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
697 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
699 /* Figure out the start address of kernel map from /proc/kallsyms.
700 * Returns the name of the start symbol in *symbol_name. Pass in NULL as
701 * symbol_name if it's not that important.
703 static u64 machine__get_running_kernel_start(struct machine *machine,
704 const char **symbol_name)
706 char filename[PATH_MAX];
711 machine__get_kallsyms_filename(machine, filename, PATH_MAX);
713 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
716 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
717 addr = kallsyms__get_function_start(filename, name);
728 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
731 u64 start = machine__get_running_kernel_start(machine, NULL);
733 for (type = 0; type < MAP__NR_TYPES; ++type) {
736 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
737 if (machine->vmlinux_maps[type] == NULL)
740 machine->vmlinux_maps[type]->map_ip =
741 machine->vmlinux_maps[type]->unmap_ip =
743 kmap = map__kmap(machine->vmlinux_maps[type]);
747 kmap->kmaps = &machine->kmaps;
748 map_groups__insert(&machine->kmaps,
749 machine->vmlinux_maps[type]);
755 void machine__destroy_kernel_maps(struct machine *machine)
759 for (type = 0; type < MAP__NR_TYPES; ++type) {
762 if (machine->vmlinux_maps[type] == NULL)
765 kmap = map__kmap(machine->vmlinux_maps[type]);
766 map_groups__remove(&machine->kmaps,
767 machine->vmlinux_maps[type]);
768 if (kmap && kmap->ref_reloc_sym) {
770 * ref_reloc_sym is shared among all maps, so free just
773 if (type == MAP__FUNCTION) {
774 zfree((char **)&kmap->ref_reloc_sym->name);
775 zfree(&kmap->ref_reloc_sym);
777 kmap->ref_reloc_sym = NULL;
780 machine->vmlinux_maps[type] = NULL;
784 int machines__create_guest_kernel_maps(struct machines *machines)
787 struct dirent **namelist = NULL;
793 if (symbol_conf.default_guest_vmlinux_name ||
794 symbol_conf.default_guest_modules ||
795 symbol_conf.default_guest_kallsyms) {
796 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
799 if (symbol_conf.guestmount) {
800 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
803 for (i = 0; i < items; i++) {
804 if (!isdigit(namelist[i]->d_name[0])) {
805 /* Filter out . and .. */
808 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
809 if ((*endp != '\0') ||
810 (endp == namelist[i]->d_name) ||
812 pr_debug("invalid directory (%s). Skipping.\n",
813 namelist[i]->d_name);
816 sprintf(path, "%s/%s/proc/kallsyms",
817 symbol_conf.guestmount,
818 namelist[i]->d_name);
819 ret = access(path, R_OK);
821 pr_debug("Can't access file %s\n", path);
824 machines__create_kernel_maps(machines, pid);
833 void machines__destroy_kernel_maps(struct machines *machines)
835 struct rb_node *next = rb_first(&machines->guests);
837 machine__destroy_kernel_maps(&machines->host);
840 struct machine *pos = rb_entry(next, struct machine, rb_node);
842 next = rb_next(&pos->rb_node);
843 rb_erase(&pos->rb_node, &machines->guests);
844 machine__delete(pos);
848 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
850 struct machine *machine = machines__findnew(machines, pid);
855 return machine__create_kernel_maps(machine);
858 int machine__load_kallsyms(struct machine *machine, const char *filename,
859 enum map_type type, symbol_filter_t filter)
861 struct map *map = machine->vmlinux_maps[type];
862 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
865 dso__set_loaded(map->dso, type);
867 * Since /proc/kallsyms will have multiple sessions for the
868 * kernel, with modules between them, fixup the end of all
871 __map_groups__fixup_end(&machine->kmaps, type);
877 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
878 symbol_filter_t filter)
880 struct map *map = machine->vmlinux_maps[type];
881 int ret = dso__load_vmlinux_path(map->dso, map, filter);
884 dso__set_loaded(map->dso, type);
889 static void map_groups__fixup_end(struct map_groups *mg)
892 for (i = 0; i < MAP__NR_TYPES; ++i)
893 __map_groups__fixup_end(mg, i);
896 static char *get_kernel_version(const char *root_dir)
898 char version[PATH_MAX];
901 const char *prefix = "Linux version ";
903 sprintf(version, "%s/proc/version", root_dir);
904 file = fopen(version, "r");
909 tmp = fgets(version, sizeof(version), file);
912 name = strstr(version, prefix);
915 name += strlen(prefix);
916 tmp = strchr(name, ' ');
923 static bool is_kmod_dso(struct dso *dso)
925 return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
926 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
929 static int map_groups__set_module_path(struct map_groups *mg, const char *path,
935 map = map_groups__find_by_name(mg, MAP__FUNCTION, m->name);
939 long_name = strdup(path);
940 if (long_name == NULL)
943 dso__set_long_name(map->dso, long_name, true);
944 dso__kernel_module_get_build_id(map->dso, "");
947 * Full name could reveal us kmod compression, so
948 * we need to update the symtab_type if needed.
950 if (m->comp && is_kmod_dso(map->dso))
951 map->dso->symtab_type++;
956 static int map_groups__set_modules_path_dir(struct map_groups *mg,
957 const char *dir_name, int depth)
960 DIR *dir = opendir(dir_name);
964 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
968 while ((dent = readdir(dir)) != NULL) {
972 /*sshfs might return bad dent->d_type, so we have to stat*/
973 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
977 if (S_ISDIR(st.st_mode)) {
978 if (!strcmp(dent->d_name, ".") ||
979 !strcmp(dent->d_name, ".."))
982 /* Do not follow top-level source and build symlinks */
984 if (!strcmp(dent->d_name, "source") ||
985 !strcmp(dent->d_name, "build"))
989 ret = map_groups__set_modules_path_dir(mg, path,
996 ret = kmod_path__parse_name(&m, dent->d_name);
1001 ret = map_groups__set_module_path(mg, path, &m);
1015 static int machine__set_modules_path(struct machine *machine)
1018 char modules_path[PATH_MAX];
1020 version = get_kernel_version(machine->root_dir);
1024 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
1025 machine->root_dir, version);
1028 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
1031 static int machine__create_module(void *arg, const char *name, u64 start)
1033 struct machine *machine = arg;
1036 map = machine__findnew_module_map(machine, start, name);
1040 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1045 static int machine__create_modules(struct machine *machine)
1047 const char *modules;
1048 char path[PATH_MAX];
1050 if (machine__is_default_guest(machine)) {
1051 modules = symbol_conf.default_guest_modules;
1053 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
1057 if (symbol__restricted_filename(modules, "/proc/modules"))
1060 if (modules__parse(modules, machine, machine__create_module))
1063 if (!machine__set_modules_path(machine))
1066 pr_debug("Problems setting modules path maps, continuing anyway...\n");
1071 int machine__create_kernel_maps(struct machine *machine)
1073 struct dso *kernel = machine__get_kernel(machine);
1075 u64 addr = machine__get_running_kernel_start(machine, &name);
1079 if (kernel == NULL ||
1080 __machine__create_kernel_maps(machine, kernel) < 0)
1083 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
1084 if (machine__is_host(machine))
1085 pr_debug("Problems creating module maps, "
1086 "continuing anyway...\n");
1088 pr_debug("Problems creating module maps for guest %d, "
1089 "continuing anyway...\n", machine->pid);
1093 * Now that we have all the maps created, just set the ->end of them:
1095 map_groups__fixup_end(&machine->kmaps);
1097 if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
1099 machine__destroy_kernel_maps(machine);
1106 static void machine__set_kernel_mmap_len(struct machine *machine,
1107 union perf_event *event)
1111 for (i = 0; i < MAP__NR_TYPES; i++) {
1112 machine->vmlinux_maps[i]->start = event->mmap.start;
1113 machine->vmlinux_maps[i]->end = (event->mmap.start +
1116 * Be a bit paranoid here, some perf.data file came with
1117 * a zero sized synthesized MMAP event for the kernel.
1119 if (machine->vmlinux_maps[i]->end == 0)
1120 machine->vmlinux_maps[i]->end = ~0ULL;
1124 static bool machine__uses_kcore(struct machine *machine)
1128 list_for_each_entry(dso, &machine->dsos.head, node) {
1129 if (dso__is_kcore(dso))
1136 static int machine__process_kernel_mmap_event(struct machine *machine,
1137 union perf_event *event)
1140 char kmmap_prefix[PATH_MAX];
1141 enum dso_kernel_type kernel_type;
1142 bool is_kernel_mmap;
1144 /* If we have maps from kcore then we do not need or want any others */
1145 if (machine__uses_kcore(machine))
1148 machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
1149 if (machine__is_host(machine))
1150 kernel_type = DSO_TYPE_KERNEL;
1152 kernel_type = DSO_TYPE_GUEST_KERNEL;
1154 is_kernel_mmap = memcmp(event->mmap.filename,
1156 strlen(kmmap_prefix) - 1) == 0;
1157 if (event->mmap.filename[0] == '/' ||
1158 (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
1159 map = machine__findnew_module_map(machine, event->mmap.start,
1160 event->mmap.filename);
1164 map->end = map->start + event->mmap.len;
1165 } else if (is_kernel_mmap) {
1166 const char *symbol_name = (event->mmap.filename +
1167 strlen(kmmap_prefix));
1169 * Should be there already, from the build-id table in
1172 struct dso *kernel = NULL;
1175 pthread_rwlock_rdlock(&machine->dsos.lock);
1177 list_for_each_entry(dso, &machine->dsos.head, node) {
1180 * The cpumode passed to is_kernel_module is not the
1181 * cpumode of *this* event. If we insist on passing
1182 * correct cpumode to is_kernel_module, we should
1183 * record the cpumode when we adding this dso to the
1186 * However we don't really need passing correct
1187 * cpumode. We know the correct cpumode must be kernel
1188 * mode (if not, we should not link it onto kernel_dsos
1191 * Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
1192 * is_kernel_module() treats it as a kernel cpumode.
1196 is_kernel_module(dso->long_name,
1197 PERF_RECORD_MISC_CPUMODE_UNKNOWN))
1205 pthread_rwlock_unlock(&machine->dsos.lock);
1208 kernel = machine__findnew_dso(machine, kmmap_prefix);
1212 kernel->kernel = kernel_type;
1213 if (__machine__create_kernel_maps(machine, kernel) < 0) {
1218 if (strstr(kernel->long_name, "vmlinux"))
1219 dso__set_short_name(kernel, "[kernel.vmlinux]", false);
1221 machine__set_kernel_mmap_len(machine, event);
1224 * Avoid using a zero address (kptr_restrict) for the ref reloc
1225 * symbol. Effectively having zero here means that at record
1226 * time /proc/sys/kernel/kptr_restrict was non zero.
1228 if (event->mmap.pgoff != 0) {
1229 maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
1234 if (machine__is_default_guest(machine)) {
1236 * preload dso of guest kernel and modules
1238 dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1247 int machine__process_mmap2_event(struct machine *machine,
1248 union perf_event *event,
1249 struct perf_sample *sample __maybe_unused)
1251 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1252 struct thread *thread;
1258 perf_event__fprintf_mmap2(event, stdout);
1260 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1261 cpumode == PERF_RECORD_MISC_KERNEL) {
1262 ret = machine__process_kernel_mmap_event(machine, event);
1268 thread = machine__findnew_thread(machine, event->mmap2.pid,
1273 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1274 type = MAP__VARIABLE;
1276 type = MAP__FUNCTION;
1278 map = map__new(machine, event->mmap2.start,
1279 event->mmap2.len, event->mmap2.pgoff,
1280 event->mmap2.pid, event->mmap2.maj,
1281 event->mmap2.min, event->mmap2.ino,
1282 event->mmap2.ino_generation,
1285 event->mmap2.filename, type, thread);
1288 goto out_problem_map;
1290 thread__insert_map(thread, map);
1291 thread__put(thread);
1296 thread__put(thread);
1298 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1302 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1303 struct perf_sample *sample __maybe_unused)
1305 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1306 struct thread *thread;
1312 perf_event__fprintf_mmap(event, stdout);
1314 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1315 cpumode == PERF_RECORD_MISC_KERNEL) {
1316 ret = machine__process_kernel_mmap_event(machine, event);
1322 thread = machine__findnew_thread(machine, event->mmap.pid,
1327 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1328 type = MAP__VARIABLE;
1330 type = MAP__FUNCTION;
1332 map = map__new(machine, event->mmap.start,
1333 event->mmap.len, event->mmap.pgoff,
1334 event->mmap.pid, 0, 0, 0, 0, 0, 0,
1335 event->mmap.filename,
1339 goto out_problem_map;
1341 thread__insert_map(thread, map);
1342 thread__put(thread);
1347 thread__put(thread);
1349 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1353 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock)
1355 if (machine->last_match == th)
1356 machine->last_match = NULL;
1358 BUG_ON(atomic_read(&th->refcnt) == 0);
1360 pthread_rwlock_wrlock(&machine->threads_lock);
1361 rb_erase_init(&th->rb_node, &machine->threads);
1362 RB_CLEAR_NODE(&th->rb_node);
1364 * Move it first to the dead_threads list, then drop the reference,
1365 * if this is the last reference, then the thread__delete destructor
1366 * will be called and we will remove it from the dead_threads list.
1368 list_add_tail(&th->node, &machine->dead_threads);
1370 pthread_rwlock_unlock(&machine->threads_lock);
1374 void machine__remove_thread(struct machine *machine, struct thread *th)
1376 return __machine__remove_thread(machine, th, true);
1379 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1380 struct perf_sample *sample)
1382 struct thread *thread = machine__find_thread(machine,
1385 struct thread *parent = machine__findnew_thread(machine,
1391 perf_event__fprintf_task(event, stdout);
1394 * There may be an existing thread that is not actually the parent,
1395 * either because we are processing events out of order, or because the
1396 * (fork) event that would have removed the thread was lost. Assume the
1397 * latter case and continue on as best we can.
1399 if (parent->pid_ != (pid_t)event->fork.ppid) {
1400 dump_printf("removing erroneous parent thread %d/%d\n",
1401 parent->pid_, parent->tid);
1402 machine__remove_thread(machine, parent);
1403 thread__put(parent);
1404 parent = machine__findnew_thread(machine, event->fork.ppid,
1408 /* if a thread currently exists for the thread id remove it */
1409 if (thread != NULL) {
1410 machine__remove_thread(machine, thread);
1411 thread__put(thread);
1414 thread = machine__findnew_thread(machine, event->fork.pid,
1417 if (thread == NULL || parent == NULL ||
1418 thread__fork(thread, parent, sample->time) < 0) {
1419 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1422 thread__put(thread);
1423 thread__put(parent);
1428 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1429 struct perf_sample *sample __maybe_unused)
1431 struct thread *thread = machine__find_thread(machine,
1436 perf_event__fprintf_task(event, stdout);
1438 if (thread != NULL) {
1439 thread__exited(thread);
1440 thread__put(thread);
1446 int machine__process_event(struct machine *machine, union perf_event *event,
1447 struct perf_sample *sample)
1451 switch (event->header.type) {
1452 case PERF_RECORD_COMM:
1453 ret = machine__process_comm_event(machine, event, sample); break;
1454 case PERF_RECORD_MMAP:
1455 ret = machine__process_mmap_event(machine, event, sample); break;
1456 case PERF_RECORD_MMAP2:
1457 ret = machine__process_mmap2_event(machine, event, sample); break;
1458 case PERF_RECORD_FORK:
1459 ret = machine__process_fork_event(machine, event, sample); break;
1460 case PERF_RECORD_EXIT:
1461 ret = machine__process_exit_event(machine, event, sample); break;
1462 case PERF_RECORD_LOST:
1463 ret = machine__process_lost_event(machine, event, sample); break;
1464 case PERF_RECORD_AUX:
1465 ret = machine__process_aux_event(machine, event); break;
1466 case PERF_RECORD_ITRACE_START:
1467 ret = machine__process_itrace_start_event(machine, event); break;
1468 case PERF_RECORD_LOST_SAMPLES:
1469 ret = machine__process_lost_samples_event(machine, event, sample); break;
1478 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1480 if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1485 static void ip__resolve_ams(struct thread *thread,
1486 struct addr_map_symbol *ams,
1489 struct addr_location al;
1491 memset(&al, 0, sizeof(al));
1493 * We cannot use the header.misc hint to determine whether a
1494 * branch stack address is user, kernel, guest, hypervisor.
1495 * Branches may straddle the kernel/user/hypervisor boundaries.
1496 * Thus, we have to try consecutively until we find a match
1497 * or else, the symbol is unknown
1499 thread__find_cpumode_addr_location(thread, MAP__FUNCTION, ip, &al);
1502 ams->al_addr = al.addr;
1507 static void ip__resolve_data(struct thread *thread,
1508 u8 m, struct addr_map_symbol *ams, u64 addr)
1510 struct addr_location al;
1512 memset(&al, 0, sizeof(al));
1514 thread__find_addr_location(thread, m, MAP__VARIABLE, addr, &al);
1515 if (al.map == NULL) {
1517 * some shared data regions have execute bit set which puts
1518 * their mapping in the MAP__FUNCTION type array.
1519 * Check there as a fallback option before dropping the sample.
1521 thread__find_addr_location(thread, m, MAP__FUNCTION, addr, &al);
1525 ams->al_addr = al.addr;
1530 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1531 struct addr_location *al)
1533 struct mem_info *mi = zalloc(sizeof(*mi));
1538 ip__resolve_ams(al->thread, &mi->iaddr, sample->ip);
1539 ip__resolve_data(al->thread, al->cpumode, &mi->daddr, sample->addr);
1540 mi->data_src.val = sample->data_src;
1545 static int add_callchain_ip(struct thread *thread,
1546 struct symbol **parent,
1547 struct addr_location *root_al,
1551 struct addr_location al;
1556 thread__find_cpumode_addr_location(thread, MAP__FUNCTION,
1559 if (ip >= PERF_CONTEXT_MAX) {
1561 case PERF_CONTEXT_HV:
1562 *cpumode = PERF_RECORD_MISC_HYPERVISOR;
1564 case PERF_CONTEXT_KERNEL:
1565 *cpumode = PERF_RECORD_MISC_KERNEL;
1567 case PERF_CONTEXT_USER:
1568 *cpumode = PERF_RECORD_MISC_USER;
1571 pr_debug("invalid callchain context: "
1572 "%"PRId64"\n", (s64) ip);
1574 * It seems the callchain is corrupted.
1577 callchain_cursor_reset(&callchain_cursor);
1582 thread__find_addr_location(thread, *cpumode, MAP__FUNCTION,
1586 if (al.sym != NULL) {
1587 if (sort__has_parent && !*parent &&
1588 symbol__match_regex(al.sym, &parent_regex))
1590 else if (have_ignore_callees && root_al &&
1591 symbol__match_regex(al.sym, &ignore_callees_regex)) {
1592 /* Treat this symbol as the root,
1593 forgetting its callees. */
1595 callchain_cursor_reset(&callchain_cursor);
1599 return callchain_cursor_append(&callchain_cursor, al.addr, al.map, al.sym);
1602 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1603 struct addr_location *al)
1606 const struct branch_stack *bs = sample->branch_stack;
1607 struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1612 for (i = 0; i < bs->nr; i++) {
1613 ip__resolve_ams(al->thread, &bi[i].to, bs->entries[i].to);
1614 ip__resolve_ams(al->thread, &bi[i].from, bs->entries[i].from);
1615 bi[i].flags = bs->entries[i].flags;
1622 #define NO_ENTRY 0xff
1624 #define PERF_MAX_BRANCH_DEPTH 127
1627 static int remove_loops(struct branch_entry *l, int nr)
1630 unsigned char chash[CHASHSZ];
1632 memset(chash, NO_ENTRY, sizeof(chash));
1634 BUG_ON(PERF_MAX_BRANCH_DEPTH > 255);
1636 for (i = 0; i < nr; i++) {
1637 int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ;
1639 /* no collision handling for now */
1640 if (chash[h] == NO_ENTRY) {
1642 } else if (l[chash[h]].from == l[i].from) {
1643 bool is_loop = true;
1644 /* check if it is a real loop */
1646 for (j = chash[h]; j < i && i + off < nr; j++, off++)
1647 if (l[j].from != l[i + off].from) {
1652 memmove(l + i, l + i + off,
1653 (nr - (i + off)) * sizeof(*l));
1662 * Recolve LBR callstack chain sample
1664 * 1 on success get LBR callchain information
1665 * 0 no available LBR callchain information, should try fp
1666 * negative error code on other errors.
1668 static int resolve_lbr_callchain_sample(struct thread *thread,
1669 struct perf_sample *sample,
1670 struct symbol **parent,
1671 struct addr_location *root_al,
1674 struct ip_callchain *chain = sample->callchain;
1675 int chain_nr = min(max_stack, (int)chain->nr);
1676 u8 cpumode = PERF_RECORD_MISC_USER;
1680 for (i = 0; i < chain_nr; i++) {
1681 if (chain->ips[i] == PERF_CONTEXT_USER)
1685 /* LBR only affects the user callchain */
1686 if (i != chain_nr) {
1687 struct branch_stack *lbr_stack = sample->branch_stack;
1688 int lbr_nr = lbr_stack->nr;
1690 * LBR callstack can only get user call chain.
1691 * The mix_chain_nr is kernel call chain
1692 * number plus LBR user call chain number.
1693 * i is kernel call chain number,
1694 * 1 is PERF_CONTEXT_USER,
1695 * lbr_nr + 1 is the user call chain number.
1696 * For details, please refer to the comments
1697 * in callchain__printf
1699 int mix_chain_nr = i + 1 + lbr_nr + 1;
1701 if (mix_chain_nr > PERF_MAX_STACK_DEPTH + PERF_MAX_BRANCH_DEPTH) {
1702 pr_warning("corrupted callchain. skipping...\n");
1706 for (j = 0; j < mix_chain_nr; j++) {
1707 if (callchain_param.order == ORDER_CALLEE) {
1711 ip = lbr_stack->entries[j - i - 2].from;
1713 ip = lbr_stack->entries[0].to;
1716 ip = lbr_stack->entries[lbr_nr - j - 1].from;
1717 else if (j > lbr_nr)
1718 ip = chain->ips[i + 1 - (j - lbr_nr)];
1720 ip = lbr_stack->entries[0].to;
1723 err = add_callchain_ip(thread, parent, root_al, &cpumode, ip);
1725 return (err < 0) ? err : 0;
1733 static int thread__resolve_callchain_sample(struct thread *thread,
1734 struct perf_evsel *evsel,
1735 struct perf_sample *sample,
1736 struct symbol **parent,
1737 struct addr_location *root_al,
1740 struct branch_stack *branch = sample->branch_stack;
1741 struct ip_callchain *chain = sample->callchain;
1742 int chain_nr = min(max_stack, (int)chain->nr);
1743 u8 cpumode = PERF_RECORD_MISC_USER;
1748 callchain_cursor_reset(&callchain_cursor);
1750 if (has_branch_callstack(evsel)) {
1751 err = resolve_lbr_callchain_sample(thread, sample, parent,
1752 root_al, max_stack);
1754 return (err < 0) ? err : 0;
1758 * Based on DWARF debug information, some architectures skip
1759 * a callchain entry saved by the kernel.
1761 if (chain->nr < PERF_MAX_STACK_DEPTH)
1762 skip_idx = arch_skip_callchain_idx(thread, chain);
1765 * Add branches to call stack for easier browsing. This gives
1766 * more context for a sample than just the callers.
1768 * This uses individual histograms of paths compared to the
1769 * aggregated histograms the normal LBR mode uses.
1771 * Limitations for now:
1772 * - No extra filters
1773 * - No annotations (should annotate somehow)
1776 if (branch && callchain_param.branch_callstack) {
1777 int nr = min(max_stack, (int)branch->nr);
1778 struct branch_entry be[nr];
1780 if (branch->nr > PERF_MAX_BRANCH_DEPTH) {
1781 pr_warning("corrupted branch chain. skipping...\n");
1785 for (i = 0; i < nr; i++) {
1786 if (callchain_param.order == ORDER_CALLEE) {
1787 be[i] = branch->entries[i];
1789 * Check for overlap into the callchain.
1790 * The return address is one off compared to
1791 * the branch entry. To adjust for this
1792 * assume the calling instruction is not longer
1795 if (i == skip_idx ||
1796 chain->ips[first_call] >= PERF_CONTEXT_MAX)
1798 else if (be[i].from < chain->ips[first_call] &&
1799 be[i].from >= chain->ips[first_call] - 8)
1802 be[i] = branch->entries[branch->nr - i - 1];
1805 nr = remove_loops(be, nr);
1807 for (i = 0; i < nr; i++) {
1808 err = add_callchain_ip(thread, parent, root_al,
1811 err = add_callchain_ip(thread, parent, root_al,
1822 if (chain->nr > PERF_MAX_STACK_DEPTH) {
1823 pr_warning("corrupted callchain. skipping...\n");
1827 for (i = first_call; i < chain_nr; i++) {
1830 if (callchain_param.order == ORDER_CALLEE)
1833 j = chain->nr - i - 1;
1835 #ifdef HAVE_SKIP_CALLCHAIN_IDX
1841 err = add_callchain_ip(thread, parent, root_al, &cpumode, ip);
1844 return (err < 0) ? err : 0;
1850 static int unwind_entry(struct unwind_entry *entry, void *arg)
1852 struct callchain_cursor *cursor = arg;
1853 return callchain_cursor_append(cursor, entry->ip,
1854 entry->map, entry->sym);
1857 int thread__resolve_callchain(struct thread *thread,
1858 struct perf_evsel *evsel,
1859 struct perf_sample *sample,
1860 struct symbol **parent,
1861 struct addr_location *root_al,
1864 int ret = thread__resolve_callchain_sample(thread, evsel,
1866 root_al, max_stack);
1870 /* Can we do dwarf post unwind? */
1871 if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1872 (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1875 /* Bail out if nothing was captured. */
1876 if ((!sample->user_regs.regs) ||
1877 (!sample->user_stack.size))
1880 return unwind__get_entries(unwind_entry, &callchain_cursor,
1881 thread, sample, max_stack);
1885 int machine__for_each_thread(struct machine *machine,
1886 int (*fn)(struct thread *thread, void *p),
1890 struct thread *thread;
1893 for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1894 thread = rb_entry(nd, struct thread, rb_node);
1895 rc = fn(thread, priv);
1900 list_for_each_entry(thread, &machine->dead_threads, node) {
1901 rc = fn(thread, priv);
1908 int machines__for_each_thread(struct machines *machines,
1909 int (*fn)(struct thread *thread, void *p),
1915 rc = machine__for_each_thread(&machines->host, fn, priv);
1919 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
1920 struct machine *machine = rb_entry(nd, struct machine, rb_node);
1922 rc = machine__for_each_thread(machine, fn, priv);
1929 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1930 struct target *target, struct thread_map *threads,
1931 perf_event__handler_t process, bool data_mmap,
1932 unsigned int proc_map_timeout)
1934 if (target__has_task(target))
1935 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap, proc_map_timeout);
1936 else if (target__has_cpu(target))
1937 return perf_event__synthesize_threads(tool, process, machine, data_mmap, proc_map_timeout);
1938 /* command specified */
1942 pid_t machine__get_current_tid(struct machine *machine, int cpu)
1944 if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid)
1947 return machine->current_tid[cpu];
1950 int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
1953 struct thread *thread;
1958 if (!machine->current_tid) {
1961 machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t));
1962 if (!machine->current_tid)
1964 for (i = 0; i < MAX_NR_CPUS; i++)
1965 machine->current_tid[i] = -1;
1968 if (cpu >= MAX_NR_CPUS) {
1969 pr_err("Requested CPU %d too large. ", cpu);
1970 pr_err("Consider raising MAX_NR_CPUS\n");
1974 machine->current_tid[cpu] = tid;
1976 thread = machine__findnew_thread(machine, pid, tid);
1981 thread__put(thread);
1986 int machine__get_kernel_start(struct machine *machine)
1988 struct map *map = machine__kernel_map(machine, MAP__FUNCTION);
1992 * The only addresses above 2^63 are kernel addresses of a 64-bit
1993 * kernel. Note that addresses are unsigned so that on a 32-bit system
1994 * all addresses including kernel addresses are less than 2^32. In
1995 * that case (32-bit system), if the kernel mapping is unknown, all
1996 * addresses will be assumed to be in user space - see
1997 * machine__kernel_ip().
1999 machine->kernel_start = 1ULL << 63;
2001 err = map__load(map, machine->symbol_filter);
2003 machine->kernel_start = map->start;
2008 struct dso *machine__findnew_dso(struct machine *machine, const char *filename)
2010 return dsos__findnew(&machine->dsos, filename);