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);
62 /* Thread holds first ref to nsdata. */
63 thread->nsinfo = nsinfo__new(pid);
73 void thread__delete(struct thread *thread)
75 struct namespaces *namespaces, *tmp_namespaces;
76 struct comm *comm, *tmp_comm;
78 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
80 thread_stack__free(thread);
83 map_groups__put(thread->mg);
86 list_for_each_entry_safe(namespaces, tmp_namespaces,
87 &thread->namespaces_list, list) {
88 list_del(&namespaces->list);
89 namespaces__free(namespaces);
91 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
92 list_del(&comm->list);
95 unwind__finish_access(thread);
96 nsinfo__zput(thread->nsinfo);
101 struct thread *thread__get(struct thread *thread)
104 refcount_inc(&thread->refcnt);
108 void thread__put(struct thread *thread)
110 if (thread && refcount_dec_and_test(&thread->refcnt)) {
112 * Remove it from the dead_threads list, as last reference
115 list_del_init(&thread->node);
116 thread__delete(thread);
120 struct namespaces *thread__namespaces(const struct thread *thread)
122 if (list_empty(&thread->namespaces_list))
125 return list_first_entry(&thread->namespaces_list, struct namespaces, list);
128 int thread__set_namespaces(struct thread *thread, u64 timestamp,
129 struct namespaces_event *event)
131 struct namespaces *new, *curr = thread__namespaces(thread);
133 new = namespaces__new(event);
137 list_add(&new->list, &thread->namespaces_list);
139 if (timestamp && curr) {
141 * setns syscall must have changed few or all the namespaces
142 * of this thread. Update end time for the namespaces
145 curr = list_next_entry(new, list);
146 curr->end_time = timestamp;
152 struct comm *thread__comm(const struct thread *thread)
154 if (list_empty(&thread->comm_list))
157 return list_first_entry(&thread->comm_list, struct comm, list);
160 struct comm *thread__exec_comm(const struct thread *thread)
162 struct comm *comm, *last = NULL;
164 list_for_each_entry(comm, &thread->comm_list, list) {
173 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
176 struct comm *new, *curr = thread__comm(thread);
178 /* Override the default :tid entry */
179 if (!thread->comm_set) {
180 int err = comm__override(curr, str, timestamp, exec);
184 new = comm__new(str, timestamp, exec);
187 list_add(&new->list, &thread->comm_list);
190 unwind__flush_access(thread);
193 thread->comm_set = true;
198 int thread__set_comm_from_proc(struct thread *thread)
205 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
206 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
207 procfs__read_str(path, &comm, &sz) == 0) {
209 err = thread__set_comm(thread, comm, 0);
215 const char *thread__comm_str(const struct thread *thread)
217 const struct comm *comm = thread__comm(thread);
222 return comm__str(comm);
225 /* CHECKME: it should probably better return the max comm len from its comm list */
226 int thread__comm_len(struct thread *thread)
228 if (!thread->comm_len) {
229 const char *comm = thread__comm_str(thread);
232 thread->comm_len = strlen(comm);
235 return thread->comm_len;
238 size_t thread__fprintf(struct thread *thread, FILE *fp)
240 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
241 map_groups__fprintf(thread->mg, fp);
244 int thread__insert_map(struct thread *thread, struct map *map)
248 ret = unwind__prepare_access(thread, map, NULL);
252 map_groups__fixup_overlappings(thread->mg, map, stderr);
253 map_groups__insert(thread->mg, map);
258 static int __thread__prepare_access(struct thread *thread)
260 bool initialized = false;
263 for (i = 0; i < MAP__NR_TYPES; ++i) {
264 struct maps *maps = &thread->mg->maps[i];
267 down_read(&maps->lock);
269 for (map = maps__first(maps); map; map = map__next(map)) {
270 err = unwind__prepare_access(thread, map, &initialized);
271 if (err || initialized)
275 up_read(&maps->lock);
281 static int thread__prepare_access(struct thread *thread)
285 if (symbol_conf.use_callchain)
286 err = __thread__prepare_access(thread);
291 static int thread__clone_map_groups(struct thread *thread,
292 struct thread *parent)
296 /* This is new thread, we share map groups for process. */
297 if (thread->pid_ == parent->pid_)
298 return thread__prepare_access(thread);
300 if (thread->mg == parent->mg) {
301 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
302 thread->pid_, thread->tid, parent->pid_, parent->tid);
306 /* But this one is new process, copy maps. */
307 for (i = 0; i < MAP__NR_TYPES; ++i)
308 if (map_groups__clone(thread, parent->mg, i) < 0)
314 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
316 if (parent->comm_set) {
317 const char *comm = thread__comm_str(parent);
321 err = thread__set_comm(thread, comm, timestamp);
326 thread->ppid = parent->tid;
327 return thread__clone_map_groups(thread, parent);
330 void thread__find_cpumode_addr_location(struct thread *thread,
331 enum map_type type, u64 addr,
332 struct addr_location *al)
335 const u8 cpumodes[] = {
336 PERF_RECORD_MISC_USER,
337 PERF_RECORD_MISC_KERNEL,
338 PERF_RECORD_MISC_GUEST_USER,
339 PERF_RECORD_MISC_GUEST_KERNEL
342 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
343 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
349 struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
351 if (thread->pid_ == thread->tid)
352 return thread__get(thread);
354 if (thread->pid_ == -1)
357 return machine__find_thread(machine, thread->pid_, thread->pid_);