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
);
25 int machine__init(struct machine
*machine
, const char *root_dir
, pid_t pid
)
27 map_groups__init(&machine
->kmaps
, machine
);
28 RB_CLEAR_NODE(&machine
->rb_node
);
29 dsos__init(&machine
->user_dsos
);
30 dsos__init(&machine
->kernel_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__delete(struct dsos
*dsos
)
89 list_for_each_entry_safe(pos
, n
, &dsos
->head
, node
) {
90 RB_CLEAR_NODE(&pos
->rb_node
);
96 void machine__delete_threads(struct machine
*machine
)
100 pthread_rwlock_wrlock(&machine
->threads_lock
);
101 nd
= rb_first(&machine
->threads
);
103 struct thread
*t
= rb_entry(nd
, struct thread
, rb_node
);
106 __machine__remove_thread(machine
, t
, false);
108 pthread_rwlock_unlock(&machine
->threads_lock
);
111 void machine__exit(struct machine
*machine
)
113 map_groups__exit(&machine
->kmaps
);
114 dsos__delete(&machine
->user_dsos
);
115 dsos__delete(&machine
->kernel_dsos
);
117 zfree(&machine
->root_dir
);
118 zfree(&machine
->current_tid
);
119 pthread_rwlock_destroy(&machine
->threads_lock
);
122 void machine__delete(struct machine
*machine
)
124 machine__exit(machine
);
128 void machines__init(struct machines
*machines
)
130 machine__init(&machines
->host
, "", HOST_KERNEL_ID
);
131 machines
->guests
= RB_ROOT
;
132 machines
->symbol_filter
= NULL
;
135 void machines__exit(struct machines
*machines
)
137 machine__exit(&machines
->host
);
141 struct machine
*machines__add(struct machines
*machines
, pid_t pid
,
142 const char *root_dir
)
144 struct rb_node
**p
= &machines
->guests
.rb_node
;
145 struct rb_node
*parent
= NULL
;
146 struct machine
*pos
, *machine
= malloc(sizeof(*machine
));
151 if (machine__init(machine
, root_dir
, pid
) != 0) {
156 machine
->symbol_filter
= machines
->symbol_filter
;
160 pos
= rb_entry(parent
, struct machine
, rb_node
);
167 rb_link_node(&machine
->rb_node
, parent
, p
);
168 rb_insert_color(&machine
->rb_node
, &machines
->guests
);
173 void machines__set_symbol_filter(struct machines
*machines
,
174 symbol_filter_t symbol_filter
)
178 machines
->symbol_filter
= symbol_filter
;
179 machines
->host
.symbol_filter
= symbol_filter
;
181 for (nd
= rb_first(&machines
->guests
); nd
; nd
= rb_next(nd
)) {
182 struct machine
*machine
= rb_entry(nd
, struct machine
, rb_node
);
184 machine
->symbol_filter
= symbol_filter
;
188 void machines__set_comm_exec(struct machines
*machines
, bool comm_exec
)
192 machines
->host
.comm_exec
= comm_exec
;
194 for (nd
= rb_first(&machines
->guests
); nd
; nd
= rb_next(nd
)) {
195 struct machine
*machine
= rb_entry(nd
, struct machine
, rb_node
);
197 machine
->comm_exec
= comm_exec
;
201 struct machine
*machines__find(struct machines
*machines
, pid_t pid
)
203 struct rb_node
**p
= &machines
->guests
.rb_node
;
204 struct rb_node
*parent
= NULL
;
205 struct machine
*machine
;
206 struct machine
*default_machine
= NULL
;
208 if (pid
== HOST_KERNEL_ID
)
209 return &machines
->host
;
213 machine
= rb_entry(parent
, struct machine
, rb_node
);
214 if (pid
< machine
->pid
)
216 else if (pid
> machine
->pid
)
221 default_machine
= machine
;
224 return default_machine
;
227 struct machine
*machines__findnew(struct machines
*machines
, pid_t pid
)
230 const char *root_dir
= "";
231 struct machine
*machine
= machines__find(machines
, pid
);
233 if (machine
&& (machine
->pid
== pid
))
236 if ((pid
!= HOST_KERNEL_ID
) &&
237 (pid
!= DEFAULT_GUEST_KERNEL_ID
) &&
238 (symbol_conf
.guestmount
)) {
239 sprintf(path
, "%s/%d", symbol_conf
.guestmount
, pid
);
240 if (access(path
, R_OK
)) {
241 static struct strlist
*seen
;
244 seen
= strlist__new(true, NULL
);
246 if (!strlist__has_entry(seen
, path
)) {
247 pr_err("Can't access file %s\n", path
);
248 strlist__add(seen
, path
);
256 machine
= machines__add(machines
, pid
, root_dir
);
261 void machines__process_guests(struct machines
*machines
,
262 machine__process_t process
, void *data
)
266 for (nd
= rb_first(&machines
->guests
); nd
; nd
= rb_next(nd
)) {
267 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
272 char *machine__mmap_name(struct machine
*machine
, char *bf
, size_t size
)
274 if (machine__is_host(machine
))
275 snprintf(bf
, size
, "[%s]", "kernel.kallsyms");
276 else if (machine__is_default_guest(machine
))
277 snprintf(bf
, size
, "[%s]", "guest.kernel.kallsyms");
279 snprintf(bf
, size
, "[%s.%d]", "guest.kernel.kallsyms",
286 void machines__set_id_hdr_size(struct machines
*machines
, u16 id_hdr_size
)
288 struct rb_node
*node
;
289 struct machine
*machine
;
291 machines
->host
.id_hdr_size
= id_hdr_size
;
293 for (node
= rb_first(&machines
->guests
); node
; node
= rb_next(node
)) {
294 machine
= rb_entry(node
, struct machine
, rb_node
);
295 machine
->id_hdr_size
= id_hdr_size
;
301 static void machine__update_thread_pid(struct machine
*machine
,
302 struct thread
*th
, pid_t pid
)
304 struct thread
*leader
;
306 if (pid
== th
->pid_
|| pid
== -1 || th
->pid_
!= -1)
311 if (th
->pid_
== th
->tid
)
314 leader
= __machine__findnew_thread(machine
, th
->pid_
, th
->pid_
);
319 leader
->mg
= map_groups__new(machine
);
324 if (th
->mg
== leader
->mg
)
329 * Maps are created from MMAP events which provide the pid and
330 * tid. Consequently there never should be any maps on a thread
331 * with an unknown pid. Just print an error if there are.
333 if (!map_groups__empty(th
->mg
))
334 pr_err("Discarding thread maps for %d:%d\n",
336 map_groups__delete(th
->mg
);
339 th
->mg
= map_groups__get(leader
->mg
);
344 pr_err("Failed to join map groups for %d:%d\n", th
->pid_
, th
->tid
);
347 static struct thread
*____machine__findnew_thread(struct machine
*machine
,
348 pid_t pid
, pid_t tid
,
351 struct rb_node
**p
= &machine
->threads
.rb_node
;
352 struct rb_node
*parent
= NULL
;
356 * Front-end cache - TID lookups come in blocks,
357 * so most of the time we dont have to look up
360 th
= machine
->last_match
;
362 if (th
->tid
== tid
) {
363 machine__update_thread_pid(machine
, th
, pid
);
367 machine
->last_match
= NULL
;
372 th
= rb_entry(parent
, struct thread
, rb_node
);
374 if (th
->tid
== tid
) {
375 machine
->last_match
= th
;
376 machine__update_thread_pid(machine
, th
, pid
);
389 th
= thread__new(pid
, tid
);
391 rb_link_node(&th
->rb_node
, parent
, p
);
392 rb_insert_color(&th
->rb_node
, &machine
->threads
);
395 * We have to initialize map_groups separately
396 * after rb tree is updated.
398 * The reason is that we call machine__findnew_thread
399 * within thread__init_map_groups to find the thread
400 * leader and that would screwed the rb tree.
402 if (thread__init_map_groups(th
, machine
)) {
403 rb_erase(&th
->rb_node
, &machine
->threads
);
404 RB_CLEAR_NODE(&th
->rb_node
);
409 * It is now in the rbtree, get a ref
412 machine
->last_match
= th
;
418 struct thread
*__machine__findnew_thread(struct machine
*machine
, pid_t pid
, pid_t tid
)
420 return ____machine__findnew_thread(machine
, pid
, tid
, true);
423 struct thread
*machine__findnew_thread(struct machine
*machine
, pid_t pid
,
428 pthread_rwlock_wrlock(&machine
->threads_lock
);
429 th
= thread__get(__machine__findnew_thread(machine
, pid
, tid
));
430 pthread_rwlock_unlock(&machine
->threads_lock
);
434 struct thread
*machine__find_thread(struct machine
*machine
, pid_t pid
,
438 pthread_rwlock_rdlock(&machine
->threads_lock
);
439 th
= thread__get(____machine__findnew_thread(machine
, pid
, tid
, false));
440 pthread_rwlock_unlock(&machine
->threads_lock
);
444 struct comm
*machine__thread_exec_comm(struct machine
*machine
,
445 struct thread
*thread
)
447 if (machine
->comm_exec
)
448 return thread__exec_comm(thread
);
450 return thread__comm(thread
);
453 int machine__process_comm_event(struct machine
*machine
, union perf_event
*event
,
454 struct perf_sample
*sample
)
456 struct thread
*thread
= machine__findnew_thread(machine
,
459 bool exec
= event
->header
.misc
& PERF_RECORD_MISC_COMM_EXEC
;
463 machine
->comm_exec
= true;
466 perf_event__fprintf_comm(event
, stdout
);
468 if (thread
== NULL
||
469 __thread__set_comm(thread
, event
->comm
.comm
, sample
->time
, exec
)) {
470 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
479 int machine__process_lost_event(struct machine
*machine __maybe_unused
,
480 union perf_event
*event
, struct perf_sample
*sample __maybe_unused
)
482 dump_printf(": id:%" PRIu64
": lost:%" PRIu64
"\n",
483 event
->lost
.id
, event
->lost
.lost
);
488 machine__module_dso(struct machine
*machine
, struct kmod_path
*m
,
489 const char *filename
)
493 dso
= dsos__find(&machine
->kernel_dsos
, m
->name
, true);
495 dso
= dsos__addnew(&machine
->kernel_dsos
, m
->name
);
499 if (machine__is_host(machine
))
500 dso
->symtab_type
= DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE
;
502 dso
->symtab_type
= DSO_BINARY_TYPE__GUEST_KMODULE
;
504 /* _KMODULE_COMP should be next to _KMODULE */
505 if (m
->kmod
&& m
->comp
)
508 dso__set_short_name(dso
, strdup(m
->name
), true);
509 dso__set_long_name(dso
, strdup(filename
), true);
515 int machine__process_aux_event(struct machine
*machine __maybe_unused
,
516 union perf_event
*event
)
519 perf_event__fprintf_aux(event
, stdout
);
523 int machine__process_itrace_start_event(struct machine
*machine __maybe_unused
,
524 union perf_event
*event
)
527 perf_event__fprintf_itrace_start(event
, stdout
);
531 struct map
*machine__new_module(struct machine
*machine
, u64 start
,
532 const char *filename
)
534 struct map
*map
= NULL
;
538 if (kmod_path__parse_name(&m
, filename
))
541 map
= map_groups__find_by_name(&machine
->kmaps
, MAP__FUNCTION
,
546 dso
= machine__module_dso(machine
, &m
, filename
);
550 map
= map__new2(start
, dso
, MAP__FUNCTION
);
554 map_groups__insert(&machine
->kmaps
, map
);
561 size_t machines__fprintf_dsos(struct machines
*machines
, FILE *fp
)
564 size_t ret
= __dsos__fprintf(&machines
->host
.kernel_dsos
.head
, fp
) +
565 __dsos__fprintf(&machines
->host
.user_dsos
.head
, fp
);
567 for (nd
= rb_first(&machines
->guests
); nd
; nd
= rb_next(nd
)) {
568 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
569 ret
+= __dsos__fprintf(&pos
->kernel_dsos
.head
, fp
);
570 ret
+= __dsos__fprintf(&pos
->user_dsos
.head
, fp
);
576 size_t machine__fprintf_dsos_buildid(struct machine
*m
, FILE *fp
,
577 bool (skip
)(struct dso
*dso
, int parm
), int parm
)
579 return __dsos__fprintf_buildid(&m
->kernel_dsos
.head
, fp
, skip
, parm
) +
580 __dsos__fprintf_buildid(&m
->user_dsos
.head
, fp
, skip
, parm
);
583 size_t machines__fprintf_dsos_buildid(struct machines
*machines
, FILE *fp
,
584 bool (skip
)(struct dso
*dso
, int parm
), int parm
)
587 size_t ret
= machine__fprintf_dsos_buildid(&machines
->host
, fp
, skip
, parm
);
589 for (nd
= rb_first(&machines
->guests
); nd
; nd
= rb_next(nd
)) {
590 struct machine
*pos
= rb_entry(nd
, struct machine
, rb_node
);
591 ret
+= machine__fprintf_dsos_buildid(pos
, fp
, skip
, parm
);
596 size_t machine__fprintf_vmlinux_path(struct machine
*machine
, FILE *fp
)
600 struct dso
*kdso
= machine
->vmlinux_maps
[MAP__FUNCTION
]->dso
;
602 if (kdso
->has_build_id
) {
603 char filename
[PATH_MAX
];
604 if (dso__build_id_filename(kdso
, filename
, sizeof(filename
)))
605 printed
+= fprintf(fp
, "[0] %s\n", filename
);
608 for (i
= 0; i
< vmlinux_path__nr_entries
; ++i
)
609 printed
+= fprintf(fp
, "[%d] %s\n",
610 i
+ kdso
->has_build_id
, vmlinux_path
[i
]);
615 size_t machine__fprintf(struct machine
*machine
, FILE *fp
)
620 pthread_rwlock_rdlock(&machine
->threads_lock
);
622 for (nd
= rb_first(&machine
->threads
); nd
; nd
= rb_next(nd
)) {
623 struct thread
*pos
= rb_entry(nd
, struct thread
, rb_node
);
625 ret
+= thread__fprintf(pos
, fp
);
628 pthread_rwlock_unlock(&machine
->threads_lock
);
633 static struct dso
*machine__get_kernel(struct machine
*machine
)
635 const char *vmlinux_name
= NULL
;
638 if (machine__is_host(machine
)) {
639 vmlinux_name
= symbol_conf
.vmlinux_name
;
641 vmlinux_name
= "[kernel.kallsyms]";
643 kernel
= dso__kernel_findnew(machine
, vmlinux_name
,
649 if (machine__is_default_guest(machine
))
650 vmlinux_name
= symbol_conf
.default_guest_vmlinux_name
;
652 vmlinux_name
= machine__mmap_name(machine
, bf
,
655 kernel
= dso__kernel_findnew(machine
, vmlinux_name
,
657 DSO_TYPE_GUEST_KERNEL
);
660 if (kernel
!= NULL
&& (!kernel
->has_build_id
))
661 dso__read_running_kernel_build_id(kernel
, machine
);
666 struct process_args
{
670 static void machine__get_kallsyms_filename(struct machine
*machine
, char *buf
,
673 if (machine__is_default_guest(machine
))
674 scnprintf(buf
, bufsz
, "%s", symbol_conf
.default_guest_kallsyms
);
676 scnprintf(buf
, bufsz
, "%s/proc/kallsyms", machine
->root_dir
);
679 const char *ref_reloc_sym_names
[] = {"_text", "_stext", NULL
};
681 /* Figure out the start address of kernel map from /proc/kallsyms.
682 * Returns the name of the start symbol in *symbol_name. Pass in NULL as
683 * symbol_name if it's not that important.
685 static u64
machine__get_running_kernel_start(struct machine
*machine
,
686 const char **symbol_name
)
688 char filename
[PATH_MAX
];
693 machine__get_kallsyms_filename(machine
, filename
, PATH_MAX
);
695 if (symbol__restricted_filename(filename
, "/proc/kallsyms"))
698 for (i
= 0; (name
= ref_reloc_sym_names
[i
]) != NULL
; i
++) {
699 addr
= kallsyms__get_function_start(filename
, name
);
710 int __machine__create_kernel_maps(struct machine
*machine
, struct dso
*kernel
)
713 u64 start
= machine__get_running_kernel_start(machine
, NULL
);
715 for (type
= 0; type
< MAP__NR_TYPES
; ++type
) {
718 machine
->vmlinux_maps
[type
] = map__new2(start
, kernel
, type
);
719 if (machine
->vmlinux_maps
[type
] == NULL
)
722 machine
->vmlinux_maps
[type
]->map_ip
=
723 machine
->vmlinux_maps
[type
]->unmap_ip
=
725 kmap
= map__kmap(machine
->vmlinux_maps
[type
]);
729 kmap
->kmaps
= &machine
->kmaps
;
730 map_groups__insert(&machine
->kmaps
,
731 machine
->vmlinux_maps
[type
]);
737 void machine__destroy_kernel_maps(struct machine
*machine
)
741 for (type
= 0; type
< MAP__NR_TYPES
; ++type
) {
744 if (machine
->vmlinux_maps
[type
] == NULL
)
747 kmap
= map__kmap(machine
->vmlinux_maps
[type
]);
748 map_groups__remove(&machine
->kmaps
,
749 machine
->vmlinux_maps
[type
]);
750 if (kmap
&& kmap
->ref_reloc_sym
) {
752 * ref_reloc_sym is shared among all maps, so free just
755 if (type
== MAP__FUNCTION
) {
756 zfree((char **)&kmap
->ref_reloc_sym
->name
);
757 zfree(&kmap
->ref_reloc_sym
);
759 kmap
->ref_reloc_sym
= NULL
;
762 map__delete(machine
->vmlinux_maps
[type
]);
763 machine
->vmlinux_maps
[type
] = NULL
;
767 int machines__create_guest_kernel_maps(struct machines
*machines
)
770 struct dirent
**namelist
= NULL
;
776 if (symbol_conf
.default_guest_vmlinux_name
||
777 symbol_conf
.default_guest_modules
||
778 symbol_conf
.default_guest_kallsyms
) {
779 machines__create_kernel_maps(machines
, DEFAULT_GUEST_KERNEL_ID
);
782 if (symbol_conf
.guestmount
) {
783 items
= scandir(symbol_conf
.guestmount
, &namelist
, NULL
, NULL
);
786 for (i
= 0; i
< items
; i
++) {
787 if (!isdigit(namelist
[i
]->d_name
[0])) {
788 /* Filter out . and .. */
791 pid
= (pid_t
)strtol(namelist
[i
]->d_name
, &endp
, 10);
792 if ((*endp
!= '\0') ||
793 (endp
== namelist
[i
]->d_name
) ||
795 pr_debug("invalid directory (%s). Skipping.\n",
796 namelist
[i
]->d_name
);
799 sprintf(path
, "%s/%s/proc/kallsyms",
800 symbol_conf
.guestmount
,
801 namelist
[i
]->d_name
);
802 ret
= access(path
, R_OK
);
804 pr_debug("Can't access file %s\n", path
);
807 machines__create_kernel_maps(machines
, pid
);
816 void machines__destroy_kernel_maps(struct machines
*machines
)
818 struct rb_node
*next
= rb_first(&machines
->guests
);
820 machine__destroy_kernel_maps(&machines
->host
);
823 struct machine
*pos
= rb_entry(next
, struct machine
, rb_node
);
825 next
= rb_next(&pos
->rb_node
);
826 rb_erase(&pos
->rb_node
, &machines
->guests
);
827 machine__delete(pos
);
831 int machines__create_kernel_maps(struct machines
*machines
, pid_t pid
)
833 struct machine
*machine
= machines__findnew(machines
, pid
);
838 return machine__create_kernel_maps(machine
);
841 int machine__load_kallsyms(struct machine
*machine
, const char *filename
,
842 enum map_type type
, symbol_filter_t filter
)
844 struct map
*map
= machine
->vmlinux_maps
[type
];
845 int ret
= dso__load_kallsyms(map
->dso
, filename
, map
, filter
);
848 dso__set_loaded(map
->dso
, type
);
850 * Since /proc/kallsyms will have multiple sessions for the
851 * kernel, with modules between them, fixup the end of all
854 __map_groups__fixup_end(&machine
->kmaps
, type
);
860 int machine__load_vmlinux_path(struct machine
*machine
, enum map_type type
,
861 symbol_filter_t filter
)
863 struct map
*map
= machine
->vmlinux_maps
[type
];
864 int ret
= dso__load_vmlinux_path(map
->dso
, map
, filter
);
867 dso__set_loaded(map
->dso
, type
);
872 static void map_groups__fixup_end(struct map_groups
*mg
)
875 for (i
= 0; i
< MAP__NR_TYPES
; ++i
)
876 __map_groups__fixup_end(mg
, i
);
879 static char *get_kernel_version(const char *root_dir
)
881 char version
[PATH_MAX
];
884 const char *prefix
= "Linux version ";
886 sprintf(version
, "%s/proc/version", root_dir
);
887 file
= fopen(version
, "r");
892 tmp
= fgets(version
, sizeof(version
), file
);
895 name
= strstr(version
, prefix
);
898 name
+= strlen(prefix
);
899 tmp
= strchr(name
, ' ');
906 static bool is_kmod_dso(struct dso
*dso
)
908 return dso
->symtab_type
== DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE
||
909 dso
->symtab_type
== DSO_BINARY_TYPE__GUEST_KMODULE
;
912 static int map_groups__set_module_path(struct map_groups
*mg
, const char *path
,
918 map
= map_groups__find_by_name(mg
, MAP__FUNCTION
, m
->name
);
922 long_name
= strdup(path
);
923 if (long_name
== NULL
)
926 dso__set_long_name(map
->dso
, long_name
, true);
927 dso__kernel_module_get_build_id(map
->dso
, "");
930 * Full name could reveal us kmod compression, so
931 * we need to update the symtab_type if needed.
933 if (m
->comp
&& is_kmod_dso(map
->dso
))
934 map
->dso
->symtab_type
++;
939 static int map_groups__set_modules_path_dir(struct map_groups
*mg
,
940 const char *dir_name
, int depth
)
943 DIR *dir
= opendir(dir_name
);
947 pr_debug("%s: cannot open %s dir\n", __func__
, dir_name
);
951 while ((dent
= readdir(dir
)) != NULL
) {
955 /*sshfs might return bad dent->d_type, so we have to stat*/
956 snprintf(path
, sizeof(path
), "%s/%s", dir_name
, dent
->d_name
);
960 if (S_ISDIR(st
.st_mode
)) {
961 if (!strcmp(dent
->d_name
, ".") ||
962 !strcmp(dent
->d_name
, ".."))
965 /* Do not follow top-level source and build symlinks */
967 if (!strcmp(dent
->d_name
, "source") ||
968 !strcmp(dent
->d_name
, "build"))
972 ret
= map_groups__set_modules_path_dir(mg
, path
,
979 ret
= kmod_path__parse_name(&m
, dent
->d_name
);
984 ret
= map_groups__set_module_path(mg
, path
, &m
);
998 static int machine__set_modules_path(struct machine
*machine
)
1001 char modules_path
[PATH_MAX
];
1003 version
= get_kernel_version(machine
->root_dir
);
1007 snprintf(modules_path
, sizeof(modules_path
), "%s/lib/modules/%s",
1008 machine
->root_dir
, version
);
1011 return map_groups__set_modules_path_dir(&machine
->kmaps
, modules_path
, 0);
1014 static int machine__create_module(void *arg
, const char *name
, u64 start
)
1016 struct machine
*machine
= arg
;
1019 map
= machine__new_module(machine
, start
, name
);
1023 dso__kernel_module_get_build_id(map
->dso
, machine
->root_dir
);
1028 static int machine__create_modules(struct machine
*machine
)
1030 const char *modules
;
1031 char path
[PATH_MAX
];
1033 if (machine__is_default_guest(machine
)) {
1034 modules
= symbol_conf
.default_guest_modules
;
1036 snprintf(path
, PATH_MAX
, "%s/proc/modules", machine
->root_dir
);
1040 if (symbol__restricted_filename(modules
, "/proc/modules"))
1043 if (modules__parse(modules
, machine
, machine__create_module
))
1046 if (!machine__set_modules_path(machine
))
1049 pr_debug("Problems setting modules path maps, continuing anyway...\n");
1054 int machine__create_kernel_maps(struct machine
*machine
)
1056 struct dso
*kernel
= machine__get_kernel(machine
);
1058 u64 addr
= machine__get_running_kernel_start(machine
, &name
);
1062 if (kernel
== NULL
||
1063 __machine__create_kernel_maps(machine
, kernel
) < 0)
1066 if (symbol_conf
.use_modules
&& machine__create_modules(machine
) < 0) {
1067 if (machine__is_host(machine
))
1068 pr_debug("Problems creating module maps, "
1069 "continuing anyway...\n");
1071 pr_debug("Problems creating module maps for guest %d, "
1072 "continuing anyway...\n", machine
->pid
);
1076 * Now that we have all the maps created, just set the ->end of them:
1078 map_groups__fixup_end(&machine
->kmaps
);
1080 if (maps__set_kallsyms_ref_reloc_sym(machine
->vmlinux_maps
, name
,
1082 machine__destroy_kernel_maps(machine
);
1089 static void machine__set_kernel_mmap_len(struct machine
*machine
,
1090 union perf_event
*event
)
1094 for (i
= 0; i
< MAP__NR_TYPES
; i
++) {
1095 machine
->vmlinux_maps
[i
]->start
= event
->mmap
.start
;
1096 machine
->vmlinux_maps
[i
]->end
= (event
->mmap
.start
+
1099 * Be a bit paranoid here, some perf.data file came with
1100 * a zero sized synthesized MMAP event for the kernel.
1102 if (machine
->vmlinux_maps
[i
]->end
== 0)
1103 machine
->vmlinux_maps
[i
]->end
= ~0ULL;
1107 static bool machine__uses_kcore(struct machine
*machine
)
1111 list_for_each_entry(dso
, &machine
->kernel_dsos
.head
, node
) {
1112 if (dso__is_kcore(dso
))
1119 static int machine__process_kernel_mmap_event(struct machine
*machine
,
1120 union perf_event
*event
)
1123 char kmmap_prefix
[PATH_MAX
];
1124 enum dso_kernel_type kernel_type
;
1125 bool is_kernel_mmap
;
1127 /* If we have maps from kcore then we do not need or want any others */
1128 if (machine__uses_kcore(machine
))
1131 machine__mmap_name(machine
, kmmap_prefix
, sizeof(kmmap_prefix
));
1132 if (machine__is_host(machine
))
1133 kernel_type
= DSO_TYPE_KERNEL
;
1135 kernel_type
= DSO_TYPE_GUEST_KERNEL
;
1137 is_kernel_mmap
= memcmp(event
->mmap
.filename
,
1139 strlen(kmmap_prefix
) - 1) == 0;
1140 if (event
->mmap
.filename
[0] == '/' ||
1141 (!is_kernel_mmap
&& event
->mmap
.filename
[0] == '[')) {
1142 map
= machine__new_module(machine
, event
->mmap
.start
,
1143 event
->mmap
.filename
);
1147 map
->end
= map
->start
+ event
->mmap
.len
;
1148 } else if (is_kernel_mmap
) {
1149 const char *symbol_name
= (event
->mmap
.filename
+
1150 strlen(kmmap_prefix
));
1152 * Should be there already, from the build-id table in
1155 struct dso
*kernel
= NULL
;
1158 list_for_each_entry(dso
, &machine
->kernel_dsos
.head
, node
) {
1159 if (is_kernel_module(dso
->long_name
))
1167 kernel
= __dsos__findnew(&machine
->kernel_dsos
,
1172 kernel
->kernel
= kernel_type
;
1173 if (__machine__create_kernel_maps(machine
, kernel
) < 0)
1176 if (strstr(kernel
->long_name
, "vmlinux"))
1177 dso__set_short_name(kernel
, "[kernel.vmlinux]", false);
1179 machine__set_kernel_mmap_len(machine
, event
);
1182 * Avoid using a zero address (kptr_restrict) for the ref reloc
1183 * symbol. Effectively having zero here means that at record
1184 * time /proc/sys/kernel/kptr_restrict was non zero.
1186 if (event
->mmap
.pgoff
!= 0) {
1187 maps__set_kallsyms_ref_reloc_sym(machine
->vmlinux_maps
,
1192 if (machine__is_default_guest(machine
)) {
1194 * preload dso of guest kernel and modules
1196 dso__load(kernel
, machine
->vmlinux_maps
[MAP__FUNCTION
],
1205 int machine__process_mmap2_event(struct machine
*machine
,
1206 union perf_event
*event
,
1207 struct perf_sample
*sample __maybe_unused
)
1209 u8 cpumode
= event
->header
.misc
& PERF_RECORD_MISC_CPUMODE_MASK
;
1210 struct thread
*thread
;
1216 perf_event__fprintf_mmap2(event
, stdout
);
1218 if (cpumode
== PERF_RECORD_MISC_GUEST_KERNEL
||
1219 cpumode
== PERF_RECORD_MISC_KERNEL
) {
1220 ret
= machine__process_kernel_mmap_event(machine
, event
);
1226 thread
= machine__findnew_thread(machine
, event
->mmap2
.pid
,
1231 if (event
->header
.misc
& PERF_RECORD_MISC_MMAP_DATA
)
1232 type
= MAP__VARIABLE
;
1234 type
= MAP__FUNCTION
;
1236 map
= map__new(machine
, event
->mmap2
.start
,
1237 event
->mmap2
.len
, event
->mmap2
.pgoff
,
1238 event
->mmap2
.pid
, event
->mmap2
.maj
,
1239 event
->mmap2
.min
, event
->mmap2
.ino
,
1240 event
->mmap2
.ino_generation
,
1243 event
->mmap2
.filename
, type
, thread
);
1246 goto out_problem_map
;
1248 thread__insert_map(thread
, map
);
1249 thread__put(thread
);
1253 thread__put(thread
);
1255 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1259 int machine__process_mmap_event(struct machine
*machine
, union perf_event
*event
,
1260 struct perf_sample
*sample __maybe_unused
)
1262 u8 cpumode
= event
->header
.misc
& PERF_RECORD_MISC_CPUMODE_MASK
;
1263 struct thread
*thread
;
1269 perf_event__fprintf_mmap(event
, stdout
);
1271 if (cpumode
== PERF_RECORD_MISC_GUEST_KERNEL
||
1272 cpumode
== PERF_RECORD_MISC_KERNEL
) {
1273 ret
= machine__process_kernel_mmap_event(machine
, event
);
1279 thread
= machine__findnew_thread(machine
, event
->mmap
.pid
,
1284 if (event
->header
.misc
& PERF_RECORD_MISC_MMAP_DATA
)
1285 type
= MAP__VARIABLE
;
1287 type
= MAP__FUNCTION
;
1289 map
= map__new(machine
, event
->mmap
.start
,
1290 event
->mmap
.len
, event
->mmap
.pgoff
,
1291 event
->mmap
.pid
, 0, 0, 0, 0, 0, 0,
1292 event
->mmap
.filename
,
1296 goto out_problem_map
;
1298 thread__insert_map(thread
, map
);
1299 thread__put(thread
);
1303 thread__put(thread
);
1305 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1309 static void __machine__remove_thread(struct machine
*machine
, struct thread
*th
, bool lock
)
1311 if (machine
->last_match
== th
)
1312 machine
->last_match
= NULL
;
1314 BUG_ON(th
->refcnt
.counter
== 0);
1316 pthread_rwlock_wrlock(&machine
->threads_lock
);
1317 rb_erase(&th
->rb_node
, &machine
->threads
);
1318 RB_CLEAR_NODE(&th
->rb_node
);
1320 * Move it first to the dead_threads list, then drop the reference,
1321 * if this is the last reference, then the thread__delete destructor
1322 * will be called and we will remove it from the dead_threads list.
1324 list_add_tail(&th
->node
, &machine
->dead_threads
);
1326 pthread_rwlock_unlock(&machine
->threads_lock
);
1330 void machine__remove_thread(struct machine
*machine
, struct thread
*th
)
1332 return __machine__remove_thread(machine
, th
, true);
1335 int machine__process_fork_event(struct machine
*machine
, union perf_event
*event
,
1336 struct perf_sample
*sample
)
1338 struct thread
*thread
= machine__find_thread(machine
,
1341 struct thread
*parent
= machine__findnew_thread(machine
,
1346 /* if a thread currently exists for the thread id remove it */
1347 if (thread
!= NULL
) {
1348 machine__remove_thread(machine
, thread
);
1349 thread__put(thread
);
1352 thread
= machine__findnew_thread(machine
, event
->fork
.pid
,
1355 perf_event__fprintf_task(event
, stdout
);
1357 if (thread
== NULL
|| parent
== NULL
||
1358 thread__fork(thread
, parent
, sample
->time
) < 0) {
1359 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1362 thread__put(thread
);
1363 thread__put(parent
);
1368 int machine__process_exit_event(struct machine
*machine
, union perf_event
*event
,
1369 struct perf_sample
*sample __maybe_unused
)
1371 struct thread
*thread
= machine__find_thread(machine
,
1376 perf_event__fprintf_task(event
, stdout
);
1378 if (thread
!= NULL
) {
1379 thread__exited(thread
);
1380 thread__put(thread
);
1386 int machine__process_event(struct machine
*machine
, union perf_event
*event
,
1387 struct perf_sample
*sample
)
1391 switch (event
->header
.type
) {
1392 case PERF_RECORD_COMM
:
1393 ret
= machine__process_comm_event(machine
, event
, sample
); break;
1394 case PERF_RECORD_MMAP
:
1395 ret
= machine__process_mmap_event(machine
, event
, sample
); break;
1396 case PERF_RECORD_MMAP2
:
1397 ret
= machine__process_mmap2_event(machine
, event
, sample
); break;
1398 case PERF_RECORD_FORK
:
1399 ret
= machine__process_fork_event(machine
, event
, sample
); break;
1400 case PERF_RECORD_EXIT
:
1401 ret
= machine__process_exit_event(machine
, event
, sample
); break;
1402 case PERF_RECORD_LOST
:
1403 ret
= machine__process_lost_event(machine
, event
, sample
); break;
1404 case PERF_RECORD_AUX
:
1405 ret
= machine__process_aux_event(machine
, event
); break;
1406 case PERF_RECORD_ITRACE_START
:
1407 ret
= machine__process_itrace_start_event(machine
, event
);
1417 static bool symbol__match_regex(struct symbol
*sym
, regex_t
*regex
)
1419 if (sym
->name
&& !regexec(regex
, sym
->name
, 0, NULL
, 0))
1424 static void ip__resolve_ams(struct thread
*thread
,
1425 struct addr_map_symbol
*ams
,
1428 struct addr_location al
;
1430 memset(&al
, 0, sizeof(al
));
1432 * We cannot use the header.misc hint to determine whether a
1433 * branch stack address is user, kernel, guest, hypervisor.
1434 * Branches may straddle the kernel/user/hypervisor boundaries.
1435 * Thus, we have to try consecutively until we find a match
1436 * or else, the symbol is unknown
1438 thread__find_cpumode_addr_location(thread
, MAP__FUNCTION
, ip
, &al
);
1441 ams
->al_addr
= al
.addr
;
1446 static void ip__resolve_data(struct thread
*thread
,
1447 u8 m
, struct addr_map_symbol
*ams
, u64 addr
)
1449 struct addr_location al
;
1451 memset(&al
, 0, sizeof(al
));
1453 thread__find_addr_location(thread
, m
, MAP__VARIABLE
, addr
, &al
);
1454 if (al
.map
== NULL
) {
1456 * some shared data regions have execute bit set which puts
1457 * their mapping in the MAP__FUNCTION type array.
1458 * Check there as a fallback option before dropping the sample.
1460 thread__find_addr_location(thread
, m
, MAP__FUNCTION
, addr
, &al
);
1464 ams
->al_addr
= al
.addr
;
1469 struct mem_info
*sample__resolve_mem(struct perf_sample
*sample
,
1470 struct addr_location
*al
)
1472 struct mem_info
*mi
= zalloc(sizeof(*mi
));
1477 ip__resolve_ams(al
->thread
, &mi
->iaddr
, sample
->ip
);
1478 ip__resolve_data(al
->thread
, al
->cpumode
, &mi
->daddr
, sample
->addr
);
1479 mi
->data_src
.val
= sample
->data_src
;
1484 static int add_callchain_ip(struct thread
*thread
,
1485 struct symbol
**parent
,
1486 struct addr_location
*root_al
,
1490 struct addr_location al
;
1495 thread__find_cpumode_addr_location(thread
, MAP__FUNCTION
,
1498 if (ip
>= PERF_CONTEXT_MAX
) {
1500 case PERF_CONTEXT_HV
:
1501 *cpumode
= PERF_RECORD_MISC_HYPERVISOR
;
1503 case PERF_CONTEXT_KERNEL
:
1504 *cpumode
= PERF_RECORD_MISC_KERNEL
;
1506 case PERF_CONTEXT_USER
:
1507 *cpumode
= PERF_RECORD_MISC_USER
;
1510 pr_debug("invalid callchain context: "
1511 "%"PRId64
"\n", (s64
) ip
);
1513 * It seems the callchain is corrupted.
1516 callchain_cursor_reset(&callchain_cursor
);
1521 thread__find_addr_location(thread
, *cpumode
, MAP__FUNCTION
,
1525 if (al
.sym
!= NULL
) {
1526 if (sort__has_parent
&& !*parent
&&
1527 symbol__match_regex(al
.sym
, &parent_regex
))
1529 else if (have_ignore_callees
&& root_al
&&
1530 symbol__match_regex(al
.sym
, &ignore_callees_regex
)) {
1531 /* Treat this symbol as the root,
1532 forgetting its callees. */
1534 callchain_cursor_reset(&callchain_cursor
);
1538 return callchain_cursor_append(&callchain_cursor
, al
.addr
, al
.map
, al
.sym
);
1541 struct branch_info
*sample__resolve_bstack(struct perf_sample
*sample
,
1542 struct addr_location
*al
)
1545 const struct branch_stack
*bs
= sample
->branch_stack
;
1546 struct branch_info
*bi
= calloc(bs
->nr
, sizeof(struct branch_info
));
1551 for (i
= 0; i
< bs
->nr
; i
++) {
1552 ip__resolve_ams(al
->thread
, &bi
[i
].to
, bs
->entries
[i
].to
);
1553 ip__resolve_ams(al
->thread
, &bi
[i
].from
, bs
->entries
[i
].from
);
1554 bi
[i
].flags
= bs
->entries
[i
].flags
;
1561 #define NO_ENTRY 0xff
1563 #define PERF_MAX_BRANCH_DEPTH 127
1566 static int remove_loops(struct branch_entry
*l
, int nr
)
1569 unsigned char chash
[CHASHSZ
];
1571 memset(chash
, NO_ENTRY
, sizeof(chash
));
1573 BUG_ON(PERF_MAX_BRANCH_DEPTH
> 255);
1575 for (i
= 0; i
< nr
; i
++) {
1576 int h
= hash_64(l
[i
].from
, CHASHBITS
) % CHASHSZ
;
1578 /* no collision handling for now */
1579 if (chash
[h
] == NO_ENTRY
) {
1581 } else if (l
[chash
[h
]].from
== l
[i
].from
) {
1582 bool is_loop
= true;
1583 /* check if it is a real loop */
1585 for (j
= chash
[h
]; j
< i
&& i
+ off
< nr
; j
++, off
++)
1586 if (l
[j
].from
!= l
[i
+ off
].from
) {
1591 memmove(l
+ i
, l
+ i
+ off
,
1592 (nr
- (i
+ off
)) * sizeof(*l
));
1601 * Recolve LBR callstack chain sample
1603 * 1 on success get LBR callchain information
1604 * 0 no available LBR callchain information, should try fp
1605 * negative error code on other errors.
1607 static int resolve_lbr_callchain_sample(struct thread
*thread
,
1608 struct perf_sample
*sample
,
1609 struct symbol
**parent
,
1610 struct addr_location
*root_al
,
1613 struct ip_callchain
*chain
= sample
->callchain
;
1614 int chain_nr
= min(max_stack
, (int)chain
->nr
);
1615 u8 cpumode
= PERF_RECORD_MISC_USER
;
1619 for (i
= 0; i
< chain_nr
; i
++) {
1620 if (chain
->ips
[i
] == PERF_CONTEXT_USER
)
1624 /* LBR only affects the user callchain */
1625 if (i
!= chain_nr
) {
1626 struct branch_stack
*lbr_stack
= sample
->branch_stack
;
1627 int lbr_nr
= lbr_stack
->nr
;
1629 * LBR callstack can only get user call chain.
1630 * The mix_chain_nr is kernel call chain
1631 * number plus LBR user call chain number.
1632 * i is kernel call chain number,
1633 * 1 is PERF_CONTEXT_USER,
1634 * lbr_nr + 1 is the user call chain number.
1635 * For details, please refer to the comments
1636 * in callchain__printf
1638 int mix_chain_nr
= i
+ 1 + lbr_nr
+ 1;
1640 if (mix_chain_nr
> PERF_MAX_STACK_DEPTH
+ PERF_MAX_BRANCH_DEPTH
) {
1641 pr_warning("corrupted callchain. skipping...\n");
1645 for (j
= 0; j
< mix_chain_nr
; j
++) {
1646 if (callchain_param
.order
== ORDER_CALLEE
) {
1650 ip
= lbr_stack
->entries
[j
- i
- 2].from
;
1652 ip
= lbr_stack
->entries
[0].to
;
1655 ip
= lbr_stack
->entries
[lbr_nr
- j
- 1].from
;
1656 else if (j
> lbr_nr
)
1657 ip
= chain
->ips
[i
+ 1 - (j
- lbr_nr
)];
1659 ip
= lbr_stack
->entries
[0].to
;
1662 err
= add_callchain_ip(thread
, parent
, root_al
, &cpumode
, ip
);
1664 return (err
< 0) ? err
: 0;
1672 static int thread__resolve_callchain_sample(struct thread
*thread
,
1673 struct perf_evsel
*evsel
,
1674 struct perf_sample
*sample
,
1675 struct symbol
**parent
,
1676 struct addr_location
*root_al
,
1679 struct branch_stack
*branch
= sample
->branch_stack
;
1680 struct ip_callchain
*chain
= sample
->callchain
;
1681 int chain_nr
= min(max_stack
, (int)chain
->nr
);
1682 u8 cpumode
= PERF_RECORD_MISC_USER
;
1687 callchain_cursor_reset(&callchain_cursor
);
1689 if (has_branch_callstack(evsel
)) {
1690 err
= resolve_lbr_callchain_sample(thread
, sample
, parent
,
1691 root_al
, max_stack
);
1693 return (err
< 0) ? err
: 0;
1697 * Based on DWARF debug information, some architectures skip
1698 * a callchain entry saved by the kernel.
1700 if (chain
->nr
< PERF_MAX_STACK_DEPTH
)
1701 skip_idx
= arch_skip_callchain_idx(thread
, chain
);
1704 * Add branches to call stack for easier browsing. This gives
1705 * more context for a sample than just the callers.
1707 * This uses individual histograms of paths compared to the
1708 * aggregated histograms the normal LBR mode uses.
1710 * Limitations for now:
1711 * - No extra filters
1712 * - No annotations (should annotate somehow)
1715 if (branch
&& callchain_param
.branch_callstack
) {
1716 int nr
= min(max_stack
, (int)branch
->nr
);
1717 struct branch_entry be
[nr
];
1719 if (branch
->nr
> PERF_MAX_BRANCH_DEPTH
) {
1720 pr_warning("corrupted branch chain. skipping...\n");
1724 for (i
= 0; i
< nr
; i
++) {
1725 if (callchain_param
.order
== ORDER_CALLEE
) {
1726 be
[i
] = branch
->entries
[i
];
1728 * Check for overlap into the callchain.
1729 * The return address is one off compared to
1730 * the branch entry. To adjust for this
1731 * assume the calling instruction is not longer
1734 if (i
== skip_idx
||
1735 chain
->ips
[first_call
] >= PERF_CONTEXT_MAX
)
1737 else if (be
[i
].from
< chain
->ips
[first_call
] &&
1738 be
[i
].from
>= chain
->ips
[first_call
] - 8)
1741 be
[i
] = branch
->entries
[branch
->nr
- i
- 1];
1744 nr
= remove_loops(be
, nr
);
1746 for (i
= 0; i
< nr
; i
++) {
1747 err
= add_callchain_ip(thread
, parent
, root_al
,
1750 err
= add_callchain_ip(thread
, parent
, root_al
,
1761 if (chain
->nr
> PERF_MAX_STACK_DEPTH
) {
1762 pr_warning("corrupted callchain. skipping...\n");
1766 for (i
= first_call
; i
< chain_nr
; i
++) {
1769 if (callchain_param
.order
== ORDER_CALLEE
)
1772 j
= chain
->nr
- i
- 1;
1774 #ifdef HAVE_SKIP_CALLCHAIN_IDX
1780 err
= add_callchain_ip(thread
, parent
, root_al
, &cpumode
, ip
);
1783 return (err
< 0) ? err
: 0;
1789 static int unwind_entry(struct unwind_entry
*entry
, void *arg
)
1791 struct callchain_cursor
*cursor
= arg
;
1792 return callchain_cursor_append(cursor
, entry
->ip
,
1793 entry
->map
, entry
->sym
);
1796 int thread__resolve_callchain(struct thread
*thread
,
1797 struct perf_evsel
*evsel
,
1798 struct perf_sample
*sample
,
1799 struct symbol
**parent
,
1800 struct addr_location
*root_al
,
1803 int ret
= thread__resolve_callchain_sample(thread
, evsel
,
1805 root_al
, max_stack
);
1809 /* Can we do dwarf post unwind? */
1810 if (!((evsel
->attr
.sample_type
& PERF_SAMPLE_REGS_USER
) &&
1811 (evsel
->attr
.sample_type
& PERF_SAMPLE_STACK_USER
)))
1814 /* Bail out if nothing was captured. */
1815 if ((!sample
->user_regs
.regs
) ||
1816 (!sample
->user_stack
.size
))
1819 return unwind__get_entries(unwind_entry
, &callchain_cursor
,
1820 thread
, sample
, max_stack
);
1824 int machine__for_each_thread(struct machine
*machine
,
1825 int (*fn
)(struct thread
*thread
, void *p
),
1829 struct thread
*thread
;
1832 for (nd
= rb_first(&machine
->threads
); nd
; nd
= rb_next(nd
)) {
1833 thread
= rb_entry(nd
, struct thread
, rb_node
);
1834 rc
= fn(thread
, priv
);
1839 list_for_each_entry(thread
, &machine
->dead_threads
, node
) {
1840 rc
= fn(thread
, priv
);
1847 int __machine__synthesize_threads(struct machine
*machine
, struct perf_tool
*tool
,
1848 struct target
*target
, struct thread_map
*threads
,
1849 perf_event__handler_t process
, bool data_mmap
)
1851 if (target__has_task(target
))
1852 return perf_event__synthesize_thread_map(tool
, threads
, process
, machine
, data_mmap
);
1853 else if (target__has_cpu(target
))
1854 return perf_event__synthesize_threads(tool
, process
, machine
, data_mmap
);
1855 /* command specified */
1859 pid_t
machine__get_current_tid(struct machine
*machine
, int cpu
)
1861 if (cpu
< 0 || cpu
>= MAX_NR_CPUS
|| !machine
->current_tid
)
1864 return machine
->current_tid
[cpu
];
1867 int machine__set_current_tid(struct machine
*machine
, int cpu
, pid_t pid
,
1870 struct thread
*thread
;
1875 if (!machine
->current_tid
) {
1878 machine
->current_tid
= calloc(MAX_NR_CPUS
, sizeof(pid_t
));
1879 if (!machine
->current_tid
)
1881 for (i
= 0; i
< MAX_NR_CPUS
; i
++)
1882 machine
->current_tid
[i
] = -1;
1885 if (cpu
>= MAX_NR_CPUS
) {
1886 pr_err("Requested CPU %d too large. ", cpu
);
1887 pr_err("Consider raising MAX_NR_CPUS\n");
1891 machine
->current_tid
[cpu
] = tid
;
1893 thread
= machine__findnew_thread(machine
, pid
, tid
);
1898 thread__put(thread
);
1903 int machine__get_kernel_start(struct machine
*machine
)
1905 struct map
*map
= machine__kernel_map(machine
, MAP__FUNCTION
);
1909 * The only addresses above 2^63 are kernel addresses of a 64-bit
1910 * kernel. Note that addresses are unsigned so that on a 32-bit system
1911 * all addresses including kernel addresses are less than 2^32. In
1912 * that case (32-bit system), if the kernel mapping is unknown, all
1913 * addresses will be assumed to be in user space - see
1914 * machine__kernel_ip().
1916 machine
->kernel_start
= 1ULL << 63;
1918 err
= map__load(map
, machine
->symbol_filter
);
1920 machine
->kernel_start
= map
->start
;