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