1#include "../perf.h"
2#include <errno.h>
3#include <stdlib.h>
4#include <stdio.h>
5#include <string.h>
6#include <linux/kernel.h>
7#include "session.h"
8#include "thread.h"
9#include "thread-stack.h"
10#include "util.h"
11#include "debug.h"
12#include "namespaces.h"
13#include "comm.h"
14#include "unwind.h"
15
16#include <api/fs/fs.h>
17
18int thread__init_map_groups(struct thread *thread, struct machine *machine)
19{
20 pid_t pid = thread->pid_;
21
22 if (pid == thread->tid || pid == -1) {
23 thread->mg = map_groups__new(machine);
24 } else {
25 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
26 if (leader) {
27 thread->mg = map_groups__get(leader->mg);
28 thread__put(leader);
29 }
30 }
31
32 return thread->mg ? 0 : -1;
33}
34
35struct thread *thread__new(pid_t pid, pid_t tid)
36{
37 char *comm_str;
38 struct comm *comm;
39 struct thread *thread = zalloc(sizeof(*thread));
40
41 if (thread != NULL) {
42 thread->pid_ = pid;
43 thread->tid = tid;
44 thread->ppid = -1;
45 thread->cpu = -1;
46 INIT_LIST_HEAD(&thread->namespaces_list);
47 INIT_LIST_HEAD(&thread->comm_list);
48
49 comm_str = malloc(32);
50 if (!comm_str)
51 goto err_thread;
52
53 snprintf(comm_str, 32, ":%d", tid);
54 comm = comm__new(comm_str, 0, false);
55 free(comm_str);
56 if (!comm)
57 goto err_thread;
58
59 list_add(&comm->list, &thread->comm_list);
60 refcount_set(&thread->refcnt, 1);
61 RB_CLEAR_NODE(&thread->rb_node);
62 }
63
64 return thread;
65
66err_thread:
67 free(thread);
68 return NULL;
69}
70
71void thread__delete(struct thread *thread)
72{
73 struct namespaces *namespaces, *tmp_namespaces;
74 struct comm *comm, *tmp_comm;
75
76 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
77
78 thread_stack__free(thread);
79
80 if (thread->mg) {
81 map_groups__put(thread->mg);
82 thread->mg = NULL;
83 }
84 list_for_each_entry_safe(namespaces, tmp_namespaces,
85 &thread->namespaces_list, list) {
86 list_del(&namespaces->list);
87 namespaces__free(namespaces);
88 }
89 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
90 list_del(&comm->list);
91 comm__free(comm);
92 }
93 unwind__finish_access(thread);
94
95 free(thread);
96}
97
98struct thread *thread__get(struct thread *thread)
99{
100 if (thread)
101 refcount_inc(&thread->refcnt);
102 return thread;
103}
104
105void thread__put(struct thread *thread)
106{
107 if (thread && refcount_dec_and_test(&thread->refcnt)) {
108
109
110
111
112 list_del_init(&thread->node);
113 thread__delete(thread);
114 }
115}
116
117struct namespaces *thread__namespaces(const struct thread *thread)
118{
119 if (list_empty(&thread->namespaces_list))
120 return NULL;
121
122 return list_first_entry(&thread->namespaces_list, struct namespaces, list);
123}
124
125int thread__set_namespaces(struct thread *thread, u64 timestamp,
126 struct namespaces_event *event)
127{
128 struct namespaces *new, *curr = thread__namespaces(thread);
129
130 new = namespaces__new(event);
131 if (!new)
132 return -ENOMEM;
133
134 list_add(&new->list, &thread->namespaces_list);
135
136 if (timestamp && curr) {
137
138
139
140
141
142 curr = list_next_entry(new, list);
143 curr->end_time = timestamp;
144 }
145
146 return 0;
147}
148
149struct comm *thread__comm(const struct thread *thread)
150{
151 if (list_empty(&thread->comm_list))
152 return NULL;
153
154 return list_first_entry(&thread->comm_list, struct comm, list);
155}
156
157struct comm *thread__exec_comm(const struct thread *thread)
158{
159 struct comm *comm, *last = NULL;
160
161 list_for_each_entry(comm, &thread->comm_list, list) {
162 if (comm->exec)
163 return comm;
164 last = comm;
165 }
166
167 return last;
168}
169
170int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
171 bool exec)
172{
173 struct comm *new, *curr = thread__comm(thread);
174
175
176 if (!thread->comm_set) {
177 int err = comm__override(curr, str, timestamp, exec);
178 if (err)
179 return err;
180 } else {
181 new = comm__new(str, timestamp, exec);
182 if (!new)
183 return -ENOMEM;
184 list_add(&new->list, &thread->comm_list);
185
186 if (exec)
187 unwind__flush_access(thread);
188 }
189
190 thread->comm_set = true;
191
192 return 0;
193}
194
195int thread__set_comm_from_proc(struct thread *thread)
196{
197 char path[64];
198 char *comm = NULL;
199 size_t sz;
200 int err = -1;
201
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) {
205 comm[sz - 1] = '\0';
206 err = thread__set_comm(thread, comm, 0);
207 }
208
209 return err;
210}
211
212const char *thread__comm_str(const struct thread *thread)
213{
214 const struct comm *comm = thread__comm(thread);
215
216 if (!comm)
217 return NULL;
218
219 return comm__str(comm);
220}
221
222
223int thread__comm_len(struct thread *thread)
224{
225 if (!thread->comm_len) {
226 const char *comm = thread__comm_str(thread);
227 if (!comm)
228 return 0;
229 thread->comm_len = strlen(comm);
230 }
231
232 return thread->comm_len;
233}
234
235size_t thread__fprintf(struct thread *thread, FILE *fp)
236{
237 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
238 map_groups__fprintf(thread->mg, fp);
239}
240
241int thread__insert_map(struct thread *thread, struct map *map)
242{
243 int ret;
244
245 ret = unwind__prepare_access(thread, map, NULL);
246 if (ret)
247 return ret;
248
249 map_groups__fixup_overlappings(thread->mg, map, stderr);
250 map_groups__insert(thread->mg, map);
251
252 return 0;
253}
254
255static int __thread__prepare_access(struct thread *thread)
256{
257 bool initialized = false;
258 int i, err = 0;
259
260 for (i = 0; i < MAP__NR_TYPES; ++i) {
261 struct maps *maps = &thread->mg->maps[i];
262 struct map *map;
263
264 pthread_rwlock_rdlock(&maps->lock);
265
266 for (map = maps__first(maps); map; map = map__next(map)) {
267 err = unwind__prepare_access(thread, map, &initialized);
268 if (err || initialized)
269 break;
270 }
271
272 pthread_rwlock_unlock(&maps->lock);
273 }
274
275 return err;
276}
277
278static int thread__prepare_access(struct thread *thread)
279{
280 int err = 0;
281
282 if (symbol_conf.use_callchain)
283 err = __thread__prepare_access(thread);
284
285 return err;
286}
287
288static int thread__clone_map_groups(struct thread *thread,
289 struct thread *parent)
290{
291 int i;
292
293
294 if (thread->pid_ == parent->pid_)
295 return thread__prepare_access(thread);
296
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);
300 return 0;
301 }
302
303
304 for (i = 0; i < MAP__NR_TYPES; ++i)
305 if (map_groups__clone(thread, parent->mg, i) < 0)
306 return -ENOMEM;
307
308 return 0;
309}
310
311int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
312{
313 if (parent->comm_set) {
314 const char *comm = thread__comm_str(parent);
315 int err;
316 if (!comm)
317 return -ENOMEM;
318 err = thread__set_comm(thread, comm, timestamp);
319 if (err)
320 return err;
321 }
322
323 thread->ppid = parent->tid;
324 return thread__clone_map_groups(thread, parent);
325}
326
327void thread__find_cpumode_addr_location(struct thread *thread,
328 enum map_type type, u64 addr,
329 struct addr_location *al)
330{
331 size_t i;
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
337 };
338
339 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
340 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
341 if (al->map)
342 break;
343 }
344}
345
346struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
347{
348 if (thread->pid_ == thread->tid)
349 return thread__get(thread);
350
351 if (thread->pid_ == -1)
352 return NULL;
353
354 return machine__find_thread(machine, thread->pid_, thread->pid_);
355}
356