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1// SPDX-License-Identifier: GPL-2.0
2#include "../perf.h"
3#include <errno.h>
4#include <stdlib.h>
5#include <stdio.h>
6#include <string.h>
7#include <linux/kernel.h>
8#include "session.h"
9#include "thread.h"
10#include "thread-stack.h"
11#include "util.h"
12#include "debug.h"
13#include "namespaces.h"
14#include "comm.h"
15#include "unwind.h"
16
17#include <api/fs/fs.h>
18
19int thread__init_map_groups(struct thread *thread, struct machine *machine)
20{
21 pid_t pid = thread->pid_;
22
23 if (pid == thread->tid || pid == -1) {
24 thread->mg = map_groups__new(machine);
25 } else {
26 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
27 if (leader) {
28 thread->mg = map_groups__get(leader->mg);
29 thread__put(leader);
30 }
31 }
32
33 return thread->mg ? 0 : -1;
34}
35
36struct thread *thread__new(pid_t pid, pid_t tid)
37{
38 char *comm_str;
39 struct comm *comm;
40 struct thread *thread = zalloc(sizeof(*thread));
41
42 if (thread != NULL) {
43 thread->pid_ = pid;
44 thread->tid = tid;
45 thread->ppid = -1;
46 thread->cpu = -1;
47 INIT_LIST_HEAD(&thread->namespaces_list);
48 INIT_LIST_HEAD(&thread->comm_list);
49 init_rwsem(&thread->namespaces_lock);
50 init_rwsem(&thread->comm_lock);
51
52 comm_str = malloc(32);
53 if (!comm_str)
54 goto err_thread;
55
56 snprintf(comm_str, 32, ":%d", tid);
57 comm = comm__new(comm_str, 0, false);
58 free(comm_str);
59 if (!comm)
60 goto err_thread;
61
62 list_add(&comm->list, &thread->comm_list);
63 refcount_set(&thread->refcnt, 1);
64 RB_CLEAR_NODE(&thread->rb_node);
65 /* Thread holds first ref to nsdata. */
66 thread->nsinfo = nsinfo__new(pid);
67 }
68
69 return thread;
70
71err_thread:
72 free(thread);
73 return NULL;
74}
75
76void thread__delete(struct thread *thread)
77{
78 struct namespaces *namespaces, *tmp_namespaces;
79 struct comm *comm, *tmp_comm;
80
81 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
82
83 thread_stack__free(thread);
84
85 if (thread->mg) {
86 map_groups__put(thread->mg);
87 thread->mg = NULL;
88 }
89 down_write(&thread->namespaces_lock);
90 list_for_each_entry_safe(namespaces, tmp_namespaces,
91 &thread->namespaces_list, list) {
92 list_del(&namespaces->list);
93 namespaces__free(namespaces);
94 }
95 up_write(&thread->namespaces_lock);
96
97 down_write(&thread->comm_lock);
98 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
99 list_del(&comm->list);
100 comm__free(comm);
101 }
102 up_write(&thread->comm_lock);
103
104 unwind__finish_access(thread);
105 nsinfo__zput(thread->nsinfo);
106
107 exit_rwsem(&thread->namespaces_lock);
108 exit_rwsem(&thread->comm_lock);
109 free(thread);
110}
111
112struct thread *thread__get(struct thread *thread)
113{
114 if (thread)
115 refcount_inc(&thread->refcnt);
116 return thread;
117}
118
119void thread__put(struct thread *thread)
120{
121 if (thread && refcount_dec_and_test(&thread->refcnt)) {
122 /*
123 * Remove it from the dead_threads list, as last reference
124 * is gone.
125 */
126 list_del_init(&thread->node);
127 thread__delete(thread);
128 }
129}
130
131struct namespaces *thread__namespaces(const struct thread *thread)
132{
133 if (list_empty(&thread->namespaces_list))
134 return NULL;
135
136 return list_first_entry(&thread->namespaces_list, struct namespaces, list);
137}
138
139static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
140 struct namespaces_event *event)
141{
142 struct namespaces *new, *curr = thread__namespaces(thread);
143
144 new = namespaces__new(event);
145 if (!new)
146 return -ENOMEM;
147
148 list_add(&new->list, &thread->namespaces_list);
149
150 if (timestamp && curr) {
151 /*
152 * setns syscall must have changed few or all the namespaces
153 * of this thread. Update end time for the namespaces
154 * previously used.
155 */
156 curr = list_next_entry(new, list);
157 curr->end_time = timestamp;
158 }
159
160 return 0;
161}
162
163int thread__set_namespaces(struct thread *thread, u64 timestamp,
164 struct namespaces_event *event)
165{
166 int ret;
167
168 down_write(&thread->namespaces_lock);
169 ret = __thread__set_namespaces(thread, timestamp, event);
170 up_write(&thread->namespaces_lock);
171 return ret;
172}
173
174struct comm *thread__comm(const struct thread *thread)
175{
176 if (list_empty(&thread->comm_list))
177 return NULL;
178
179 return list_first_entry(&thread->comm_list, struct comm, list);
180}
181
182struct comm *thread__exec_comm(const struct thread *thread)
183{
184 struct comm *comm, *last = NULL;
185
186 list_for_each_entry(comm, &thread->comm_list, list) {
187 if (comm->exec)
188 return comm;
189 last = comm;
190 }
191
192 return last;
193}
194
195static int ____thread__set_comm(struct thread *thread, const char *str,
196 u64 timestamp, bool exec)
197{
198 struct comm *new, *curr = thread__comm(thread);
199
200 /* Override the default :tid entry */
201 if (!thread->comm_set) {
202 int err = comm__override(curr, str, timestamp, exec);
203 if (err)
204 return err;
205 } else {
206 new = comm__new(str, timestamp, exec);
207 if (!new)
208 return -ENOMEM;
209 list_add(&new->list, &thread->comm_list);
210
211 if (exec)
212 unwind__flush_access(thread);
213 }
214
215 thread->comm_set = true;
216
217 return 0;
218}
219
220int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
221 bool exec)
222{
223 int ret;
224
225 down_write(&thread->comm_lock);
226 ret = ____thread__set_comm(thread, str, timestamp, exec);
227 up_write(&thread->comm_lock);
228 return ret;
229}
230
231int thread__set_comm_from_proc(struct thread *thread)
232{
233 char path[64];
234 char *comm = NULL;
235 size_t sz;
236 int err = -1;
237
238 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
239 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
240 procfs__read_str(path, &comm, &sz) == 0) {
241 comm[sz - 1] = '\0';
242 err = thread__set_comm(thread, comm, 0);
243 }
244
245 return err;
246}
247
248static const char *__thread__comm_str(const struct thread *thread)
249{
250 const struct comm *comm = thread__comm(thread);
251
252 if (!comm)
253 return NULL;
254
255 return comm__str(comm);
256}
257
258const char *thread__comm_str(const struct thread *thread)
259{
260 const char *str;
261
262 down_read((struct rw_semaphore *)&thread->comm_lock);
263 str = __thread__comm_str(thread);
264 up_read((struct rw_semaphore *)&thread->comm_lock);
265
266 return str;
267}
268
269/* CHECKME: it should probably better return the max comm len from its comm list */
270int thread__comm_len(struct thread *thread)
271{
272 if (!thread->comm_len) {
273 const char *comm = thread__comm_str(thread);
274 if (!comm)
275 return 0;
276 thread->comm_len = strlen(comm);
277 }
278
279 return thread->comm_len;
280}
281
282size_t thread__fprintf(struct thread *thread, FILE *fp)
283{
284 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
285 map_groups__fprintf(thread->mg, fp);
286}
287
288int thread__insert_map(struct thread *thread, struct map *map)
289{
290 int ret;
291
292 ret = unwind__prepare_access(thread, map, NULL);
293 if (ret)
294 return ret;
295
296 map_groups__fixup_overlappings(thread->mg, map, stderr);
297 map_groups__insert(thread->mg, map);
298
299 return 0;
300}
301
302static int __thread__prepare_access(struct thread *thread)
303{
304 bool initialized = false;
305 int i, err = 0;
306
307 for (i = 0; i < MAP__NR_TYPES; ++i) {
308 struct maps *maps = &thread->mg->maps[i];
309 struct map *map;
310
311 down_read(&maps->lock);
312
313 for (map = maps__first(maps); map; map = map__next(map)) {
314 err = unwind__prepare_access(thread, map, &initialized);
315 if (err || initialized)
316 break;
317 }
318
319 up_read(&maps->lock);
320 }
321
322 return err;
323}
324
325static int thread__prepare_access(struct thread *thread)
326{
327 int err = 0;
328
329 if (symbol_conf.use_callchain)
330 err = __thread__prepare_access(thread);
331
332 return err;
333}
334
335static int thread__clone_map_groups(struct thread *thread,
336 struct thread *parent)
337{
338 int i;
339
340 /* This is new thread, we share map groups for process. */
341 if (thread->pid_ == parent->pid_)
342 return thread__prepare_access(thread);
343
344 if (thread->mg == parent->mg) {
345 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
346 thread->pid_, thread->tid, parent->pid_, parent->tid);
347 return 0;
348 }
349
350 /* But this one is new process, copy maps. */
351 for (i = 0; i < MAP__NR_TYPES; ++i)
352 if (map_groups__clone(thread, parent->mg, i) < 0)
353 return -ENOMEM;
354
355 return 0;
356}
357
358int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
359{
360 if (parent->comm_set) {
361 const char *comm = thread__comm_str(parent);
362 int err;
363 if (!comm)
364 return -ENOMEM;
365 err = thread__set_comm(thread, comm, timestamp);
366 if (err)
367 return err;
368 }
369
370 thread->ppid = parent->tid;
371 return thread__clone_map_groups(thread, parent);
372}
373
374void thread__find_cpumode_addr_location(struct thread *thread,
375 enum map_type type, u64 addr,
376 struct addr_location *al)
377{
378 size_t i;
379 const u8 cpumodes[] = {
380 PERF_RECORD_MISC_USER,
381 PERF_RECORD_MISC_KERNEL,
382 PERF_RECORD_MISC_GUEST_USER,
383 PERF_RECORD_MISC_GUEST_KERNEL
384 };
385
386 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
387 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
388 if (al->map)
389 break;
390 }
391}
392
393struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
394{
395 if (thread->pid_ == thread->tid)
396 return thread__get(thread);
397
398 if (thread->pid_ == -1)
399 return NULL;
400
401 return machine__find_thread(machine, thread->pid_, thread->pid_);
402}
1#include "../perf.h"
2#include <stdlib.h>
3#include <stdio.h>
4#include <string.h>
5#include "session.h"
6#include "thread.h"
7#include "util.h"
8#include "debug.h"
9
10static struct thread *thread__new(pid_t pid)
11{
12 struct thread *self = zalloc(sizeof(*self));
13
14 if (self != NULL) {
15 map_groups__init(&self->mg);
16 self->pid = pid;
17 self->comm = malloc(32);
18 if (self->comm)
19 snprintf(self->comm, 32, ":%d", self->pid);
20 }
21
22 return self;
23}
24
25void thread__delete(struct thread *self)
26{
27 map_groups__exit(&self->mg);
28 free(self->comm);
29 free(self);
30}
31
32int thread__set_comm(struct thread *self, const char *comm)
33{
34 int err;
35
36 if (self->comm)
37 free(self->comm);
38 self->comm = strdup(comm);
39 err = self->comm == NULL ? -ENOMEM : 0;
40 if (!err) {
41 self->comm_set = true;
42 map_groups__flush(&self->mg);
43 }
44 return err;
45}
46
47int thread__comm_len(struct thread *self)
48{
49 if (!self->comm_len) {
50 if (!self->comm)
51 return 0;
52 self->comm_len = strlen(self->comm);
53 }
54
55 return self->comm_len;
56}
57
58static size_t thread__fprintf(struct thread *self, FILE *fp)
59{
60 return fprintf(fp, "Thread %d %s\n", self->pid, self->comm) +
61 map_groups__fprintf(&self->mg, verbose, fp);
62}
63
64struct thread *perf_session__findnew(struct perf_session *self, pid_t pid)
65{
66 struct rb_node **p = &self->threads.rb_node;
67 struct rb_node *parent = NULL;
68 struct thread *th;
69
70 /*
71 * Font-end cache - PID lookups come in blocks,
72 * so most of the time we dont have to look up
73 * the full rbtree:
74 */
75 if (self->last_match && self->last_match->pid == pid)
76 return self->last_match;
77
78 while (*p != NULL) {
79 parent = *p;
80 th = rb_entry(parent, struct thread, rb_node);
81
82 if (th->pid == pid) {
83 self->last_match = th;
84 return th;
85 }
86
87 if (pid < th->pid)
88 p = &(*p)->rb_left;
89 else
90 p = &(*p)->rb_right;
91 }
92
93 th = thread__new(pid);
94 if (th != NULL) {
95 rb_link_node(&th->rb_node, parent, p);
96 rb_insert_color(&th->rb_node, &self->threads);
97 self->last_match = th;
98 }
99
100 return th;
101}
102
103void thread__insert_map(struct thread *self, struct map *map)
104{
105 map_groups__fixup_overlappings(&self->mg, map, verbose, stderr);
106 map_groups__insert(&self->mg, map);
107}
108
109int thread__fork(struct thread *self, struct thread *parent)
110{
111 int i;
112
113 if (parent->comm_set) {
114 if (self->comm)
115 free(self->comm);
116 self->comm = strdup(parent->comm);
117 if (!self->comm)
118 return -ENOMEM;
119 self->comm_set = true;
120 }
121
122 for (i = 0; i < MAP__NR_TYPES; ++i)
123 if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
124 return -ENOMEM;
125 return 0;
126}
127
128size_t perf_session__fprintf(struct perf_session *self, FILE *fp)
129{
130 size_t ret = 0;
131 struct rb_node *nd;
132
133 for (nd = rb_first(&self->threads); nd; nd = rb_next(nd)) {
134 struct thread *pos = rb_entry(nd, struct thread, rb_node);
135
136 ret += thread__fprintf(pos, fp);
137 }
138
139 return ret;
140}