6 #include <linux/kernel.h>
9 #include "thread-stack.h"
12 #include "namespaces.h"
16 #include <api/fs/fs.h>
18 int thread__init_map_groups(struct thread *thread, struct machine *machine)
20 pid_t pid = thread->pid_;
22 if (pid == thread->tid || pid == -1) {
23 thread->mg = map_groups__new(machine);
25 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
27 thread->mg = map_groups__get(leader->mg);
32 return thread->mg ? 0 : -1;
35 struct thread *thread__new(pid_t pid, pid_t tid)
39 struct thread *thread = zalloc(sizeof(*thread));
46 INIT_LIST_HEAD(&thread->namespaces_list);
47 INIT_LIST_HEAD(&thread->comm_list);
49 comm_str = malloc(32);
53 snprintf(comm_str, 32, ":%d", tid);
54 comm = comm__new(comm_str, 0, false);
59 list_add(&comm->list, &thread->comm_list);
60 refcount_set(&thread->refcnt, 1);
61 RB_CLEAR_NODE(&thread->rb_node);
71 void thread__delete(struct thread *thread)
73 struct namespaces *namespaces, *tmp_namespaces;
74 struct comm *comm, *tmp_comm;
76 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
78 thread_stack__free(thread);
81 map_groups__put(thread->mg);
84 list_for_each_entry_safe(namespaces, tmp_namespaces,
85 &thread->namespaces_list, list) {
86 list_del(&namespaces->list);
87 namespaces__free(namespaces);
89 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
90 list_del(&comm->list);
93 unwind__finish_access(thread);
98 struct thread *thread__get(struct thread *thread)
101 refcount_inc(&thread->refcnt);
105 void thread__put(struct thread *thread)
107 if (thread && refcount_dec_and_test(&thread->refcnt)) {
109 * Remove it from the dead_threads list, as last reference
112 list_del_init(&thread->node);
113 thread__delete(thread);
117 struct namespaces *thread__namespaces(const struct thread *thread)
119 if (list_empty(&thread->namespaces_list))
122 return list_first_entry(&thread->namespaces_list, struct namespaces, list);
125 int thread__set_namespaces(struct thread *thread, u64 timestamp,
126 struct namespaces_event *event)
128 struct namespaces *new, *curr = thread__namespaces(thread);
130 new = namespaces__new(event);
134 list_add(&new->list, &thread->namespaces_list);
136 if (timestamp && curr) {
138 * setns syscall must have changed few or all the namespaces
139 * of this thread. Update end time for the namespaces
142 curr = list_next_entry(new, list);
143 curr->end_time = timestamp;
149 struct comm *thread__comm(const struct thread *thread)
151 if (list_empty(&thread->comm_list))
154 return list_first_entry(&thread->comm_list, struct comm, list);
157 struct comm *thread__exec_comm(const struct thread *thread)
159 struct comm *comm, *last = NULL;
161 list_for_each_entry(comm, &thread->comm_list, list) {
170 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
173 struct comm *new, *curr = thread__comm(thread);
175 /* Override the default :tid entry */
176 if (!thread->comm_set) {
177 int err = comm__override(curr, str, timestamp, exec);
181 new = comm__new(str, timestamp, exec);
184 list_add(&new->list, &thread->comm_list);
187 unwind__flush_access(thread);
190 thread->comm_set = true;
195 int thread__set_comm_from_proc(struct thread *thread)
202 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
203 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
204 procfs__read_str(path, &comm, &sz) == 0) {
206 err = thread__set_comm(thread, comm, 0);
212 const char *thread__comm_str(const struct thread *thread)
214 const struct comm *comm = thread__comm(thread);
219 return comm__str(comm);
222 /* CHECKME: it should probably better return the max comm len from its comm list */
223 int thread__comm_len(struct thread *thread)
225 if (!thread->comm_len) {
226 const char *comm = thread__comm_str(thread);
229 thread->comm_len = strlen(comm);
232 return thread->comm_len;
235 size_t thread__fprintf(struct thread *thread, FILE *fp)
237 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
238 map_groups__fprintf(thread->mg, fp);
241 int thread__insert_map(struct thread *thread, struct map *map)
245 ret = unwind__prepare_access(thread, map, NULL);
249 map_groups__fixup_overlappings(thread->mg, map, stderr);
250 map_groups__insert(thread->mg, map);
255 static int __thread__prepare_access(struct thread *thread)
257 bool initialized = false;
260 for (i = 0; i < MAP__NR_TYPES; ++i) {
261 struct maps *maps = &thread->mg->maps[i];
264 pthread_rwlock_rdlock(&maps->lock);
266 for (map = maps__first(maps); map; map = map__next(map)) {
267 err = unwind__prepare_access(thread, map, &initialized);
268 if (err || initialized)
272 pthread_rwlock_unlock(&maps->lock);
278 static int thread__prepare_access(struct thread *thread)
282 if (symbol_conf.use_callchain)
283 err = __thread__prepare_access(thread);
288 static int thread__clone_map_groups(struct thread *thread,
289 struct thread *parent)
293 /* This is new thread, we share map groups for process. */
294 if (thread->pid_ == parent->pid_)
295 return thread__prepare_access(thread);
297 if (thread->mg == parent->mg) {
298 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
299 thread->pid_, thread->tid, parent->pid_, parent->tid);
303 /* But this one is new process, copy maps. */
304 for (i = 0; i < MAP__NR_TYPES; ++i)
305 if (map_groups__clone(thread, parent->mg, i) < 0)
311 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
313 if (parent->comm_set) {
314 const char *comm = thread__comm_str(parent);
318 err = thread__set_comm(thread, comm, timestamp);
323 thread->ppid = parent->tid;
324 return thread__clone_map_groups(thread, parent);
327 void thread__find_cpumode_addr_location(struct thread *thread,
328 enum map_type type, u64 addr,
329 struct addr_location *al)
332 const u8 cpumodes[] = {
333 PERF_RECORD_MISC_USER,
334 PERF_RECORD_MISC_KERNEL,
335 PERF_RECORD_MISC_GUEST_USER,
336 PERF_RECORD_MISC_GUEST_KERNEL
339 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
340 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
346 struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
348 if (thread->pid_ == thread->tid)
349 return thread__get(thread);
351 if (thread->pid_ == -1)
354 return machine__find_thread(machine, thread->pid_, thread->pid_);