7 #include "thread-stack.h"
13 #include <api/fs/fs.h>
15 int thread__init_map_groups(struct thread *thread, struct machine *machine)
17 pid_t pid = thread->pid_;
19 if (pid == thread->tid || pid == -1) {
20 thread->mg = map_groups__new(machine);
22 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
24 thread->mg = map_groups__get(leader->mg);
29 return thread->mg ? 0 : -1;
32 struct thread *thread__new(pid_t pid, pid_t tid)
36 struct thread *thread = zalloc(sizeof(*thread));
43 INIT_LIST_HEAD(&thread->comm_list);
45 comm_str = malloc(32);
49 snprintf(comm_str, 32, ":%d", tid);
50 comm = comm__new(comm_str, 0, false);
55 list_add(&comm->list, &thread->comm_list);
56 atomic_set(&thread->refcnt, 1);
57 RB_CLEAR_NODE(&thread->rb_node);
67 void thread__delete(struct thread *thread)
69 struct comm *comm, *tmp;
71 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
73 thread_stack__free(thread);
76 map_groups__put(thread->mg);
79 list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
80 list_del(&comm->list);
83 unwind__finish_access(thread);
88 struct thread *thread__get(struct thread *thread)
91 atomic_inc(&thread->refcnt);
95 void thread__put(struct thread *thread)
97 if (thread && atomic_dec_and_test(&thread->refcnt)) {
99 * Remove it from the dead_threads list, as last reference
102 list_del_init(&thread->node);
103 thread__delete(thread);
107 struct comm *thread__comm(const struct thread *thread)
109 if (list_empty(&thread->comm_list))
112 return list_first_entry(&thread->comm_list, struct comm, list);
115 struct comm *thread__exec_comm(const struct thread *thread)
117 struct comm *comm, *last = NULL, *second_last = NULL;
119 list_for_each_entry(comm, &thread->comm_list, list) {
127 * 'last' with no start time might be the parent's comm of a synthesized
128 * thread (created by processing a synthesized fork event). For a main
129 * thread, that is very probably wrong. Prefer a later comm to avoid
132 if (second_last && !last->start && thread->pid_ == thread->tid)
138 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
141 struct comm *new, *curr = thread__comm(thread);
143 /* Override the default :tid entry */
144 if (!thread->comm_set) {
145 int err = comm__override(curr, str, timestamp, exec);
149 new = comm__new(str, timestamp, exec);
152 list_add(&new->list, &thread->comm_list);
155 unwind__flush_access(thread);
158 thread->comm_set = true;
163 int thread__set_comm_from_proc(struct thread *thread)
170 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
171 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
172 procfs__read_str(path, &comm, &sz) == 0) {
174 err = thread__set_comm(thread, comm, 0);
180 const char *thread__comm_str(const struct thread *thread)
182 const struct comm *comm = thread__comm(thread);
187 return comm__str(comm);
190 /* CHECKME: it should probably better return the max comm len from its comm list */
191 int thread__comm_len(struct thread *thread)
193 if (!thread->comm_len) {
194 const char *comm = thread__comm_str(thread);
197 thread->comm_len = strlen(comm);
200 return thread->comm_len;
203 size_t thread__fprintf(struct thread *thread, FILE *fp)
205 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
206 map_groups__fprintf(thread->mg, fp);
209 int thread__insert_map(struct thread *thread, struct map *map)
213 ret = unwind__prepare_access(thread, map, NULL);
217 map_groups__fixup_overlappings(thread->mg, map, stderr);
218 map_groups__insert(thread->mg, map);
223 static int __thread__prepare_access(struct thread *thread)
225 bool initialized = false;
228 for (i = 0; i < MAP__NR_TYPES; ++i) {
229 struct maps *maps = &thread->mg->maps[i];
232 pthread_rwlock_rdlock(&maps->lock);
234 for (map = maps__first(maps); map; map = map__next(map)) {
235 err = unwind__prepare_access(thread, map, &initialized);
236 if (err || initialized)
240 pthread_rwlock_unlock(&maps->lock);
246 static int thread__prepare_access(struct thread *thread)
250 if (symbol_conf.use_callchain)
251 err = __thread__prepare_access(thread);
256 static int thread__clone_map_groups(struct thread *thread,
257 struct thread *parent)
261 /* This is new thread, we share map groups for process. */
262 if (thread->pid_ == parent->pid_)
263 return thread__prepare_access(thread);
265 if (thread->mg == parent->mg) {
266 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
267 thread->pid_, thread->tid, parent->pid_, parent->tid);
271 /* But this one is new process, copy maps. */
272 for (i = 0; i < MAP__NR_TYPES; ++i)
273 if (map_groups__clone(thread, parent->mg, i) < 0)
279 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
281 if (parent->comm_set) {
282 const char *comm = thread__comm_str(parent);
286 err = thread__set_comm(thread, comm, timestamp);
291 thread->ppid = parent->tid;
292 return thread__clone_map_groups(thread, parent);
295 void thread__find_cpumode_addr_location(struct thread *thread,
296 enum map_type type, u64 addr,
297 struct addr_location *al)
300 const u8 cpumodes[] = {
301 PERF_RECORD_MISC_USER,
302 PERF_RECORD_MISC_KERNEL,
303 PERF_RECORD_MISC_GUEST_USER,
304 PERF_RECORD_MISC_GUEST_KERNEL
307 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
308 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
314 struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
316 if (thread->pid_ == thread->tid)
317 return thread__get(thread);
319 if (thread->pid_ == -1)
322 return machine__find_thread(machine, thread->pid_, thread->pid_);