7 #include "thread-stack.h"
13 #include <api/fs/fs.h>
15 int thread__init_map_groups(struct thread
*thread
, struct machine
*machine
)
17 struct thread
*leader
;
18 pid_t pid
= thread
->pid_
;
20 if (pid
== thread
->tid
|| pid
== -1) {
21 thread
->mg
= map_groups__new(machine
);
23 leader
= __machine__findnew_thread(machine
, pid
, pid
);
25 thread
->mg
= map_groups__get(leader
->mg
);
30 return thread
->mg
? 0 : -1;
33 struct thread
*thread__new(pid_t pid
, pid_t tid
)
37 struct thread
*thread
= zalloc(sizeof(*thread
));
44 INIT_LIST_HEAD(&thread
->comm_list
);
46 comm_str
= malloc(32);
50 snprintf(comm_str
, 32, ":%d", tid
);
51 comm
= comm__new(comm_str
, 0, false);
56 list_add(&comm
->list
, &thread
->comm_list
);
57 atomic_set(&thread
->refcnt
, 1);
58 RB_CLEAR_NODE(&thread
->rb_node
);
68 void thread__delete(struct thread
*thread
)
70 struct comm
*comm
, *tmp
;
72 BUG_ON(!RB_EMPTY_NODE(&thread
->rb_node
));
74 thread_stack__free(thread
);
77 map_groups__put(thread
->mg
);
80 list_for_each_entry_safe(comm
, tmp
, &thread
->comm_list
, list
) {
81 list_del(&comm
->list
);
84 unwind__finish_access(thread
);
89 struct thread
*thread__get(struct thread
*thread
)
92 atomic_inc(&thread
->refcnt
);
96 void thread__put(struct thread
*thread
)
98 if (thread
&& atomic_dec_and_test(&thread
->refcnt
)) {
100 * Remove it from the dead_threads list, as last reference
103 list_del_init(&thread
->node
);
104 thread__delete(thread
);
108 struct comm
*thread__comm(const struct thread
*thread
)
110 if (list_empty(&thread
->comm_list
))
113 return list_first_entry(&thread
->comm_list
, struct comm
, list
);
116 struct comm
*thread__exec_comm(const struct thread
*thread
)
118 struct comm
*comm
, *last
= NULL
;
120 list_for_each_entry(comm
, &thread
->comm_list
, list
) {
129 int __thread__set_comm(struct thread
*thread
, const char *str
, u64 timestamp
,
132 struct comm
*new, *curr
= thread__comm(thread
);
135 /* Override the default :tid entry */
136 if (!thread
->comm_set
) {
137 err
= comm__override(curr
, str
, timestamp
, exec
);
141 new = comm__new(str
, timestamp
, exec
);
144 list_add(&new->list
, &thread
->comm_list
);
147 unwind__flush_access(thread
);
150 thread
->comm_set
= true;
155 int thread__set_comm_from_proc(struct thread
*thread
)
162 if (!(snprintf(path
, sizeof(path
), "%d/task/%d/comm",
163 thread
->pid_
, thread
->tid
) >= (int)sizeof(path
)) &&
164 procfs__read_str(path
, &comm
, &sz
) == 0) {
166 err
= thread__set_comm(thread
, comm
, 0);
172 const char *thread__comm_str(const struct thread
*thread
)
174 const struct comm
*comm
= thread__comm(thread
);
179 return comm__str(comm
);
182 /* CHECKME: it should probably better return the max comm len from its comm list */
183 int thread__comm_len(struct thread
*thread
)
185 if (!thread
->comm_len
) {
186 const char *comm
= thread__comm_str(thread
);
189 thread
->comm_len
= strlen(comm
);
192 return thread
->comm_len
;
195 size_t thread__fprintf(struct thread
*thread
, FILE *fp
)
197 return fprintf(fp
, "Thread %d %s\n", thread
->tid
, thread__comm_str(thread
)) +
198 map_groups__fprintf(thread
->mg
, fp
);
201 int thread__insert_map(struct thread
*thread
, struct map
*map
)
205 ret
= unwind__prepare_access(thread
, map
, NULL
);
209 map_groups__fixup_overlappings(thread
->mg
, map
, stderr
);
210 map_groups__insert(thread
->mg
, map
);
215 static int __thread__prepare_access(struct thread
*thread
)
217 bool initialized
= false;
220 for (i
= 0; i
< MAP__NR_TYPES
; ++i
) {
221 struct maps
*maps
= &thread
->mg
->maps
[i
];
224 pthread_rwlock_rdlock(&maps
->lock
);
226 for (map
= maps__first(maps
); map
; map
= map__next(map
)) {
227 err
= unwind__prepare_access(thread
, map
, &initialized
);
228 if (err
|| initialized
)
232 pthread_rwlock_unlock(&maps
->lock
);
238 static int thread__prepare_access(struct thread
*thread
)
242 if (symbol_conf
.use_callchain
)
243 err
= __thread__prepare_access(thread
);
248 static int thread__clone_map_groups(struct thread
*thread
,
249 struct thread
*parent
)
253 /* This is new thread, we share map groups for process. */
254 if (thread
->pid_
== parent
->pid_
)
255 return thread__prepare_access(thread
);
257 if (thread
->mg
== parent
->mg
) {
258 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
259 thread
->pid_
, thread
->tid
, parent
->pid_
, parent
->tid
);
263 /* But this one is new process, copy maps. */
264 for (i
= 0; i
< MAP__NR_TYPES
; ++i
)
265 if (map_groups__clone(thread
, parent
->mg
, i
) < 0)
271 int thread__fork(struct thread
*thread
, struct thread
*parent
, u64 timestamp
)
275 if (parent
->comm_set
) {
276 const char *comm
= thread__comm_str(parent
);
279 err
= thread__set_comm(thread
, comm
, timestamp
);
284 thread
->ppid
= parent
->tid
;
285 return thread__clone_map_groups(thread
, parent
);
288 void thread__find_cpumode_addr_location(struct thread
*thread
,
289 enum map_type type
, u64 addr
,
290 struct addr_location
*al
)
293 const u8 cpumodes
[] = {
294 PERF_RECORD_MISC_USER
,
295 PERF_RECORD_MISC_KERNEL
,
296 PERF_RECORD_MISC_GUEST_USER
,
297 PERF_RECORD_MISC_GUEST_KERNEL
300 for (i
= 0; i
< ARRAY_SIZE(cpumodes
); i
++) {
301 thread__find_addr_location(thread
, cpumodes
[i
], type
, addr
, al
);
307 struct thread
*thread__main_thread(struct machine
*machine
, struct thread
*thread
)
309 if (thread
->pid_
== thread
->tid
)
310 return thread__get(thread
);
312 if (thread
->pid_
== -1)
315 return machine__find_thread(machine
, thread
->pid_
, thread
->pid_
);