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 18 int 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 35 struct 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 66 err_thread: 67 free(thread); 68 return NULL; 69 } 70 71 void 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 98 struct thread *thread__get(struct thread *thread) 99 { 100 if (thread) 101 refcount_inc(&thread->refcnt); 102 return thread; 103 } 104 105 void thread__put(struct thread *thread) 106 { 107 if (thread && refcount_dec_and_test(&thread->refcnt)) { 108 /* 109 * Remove it from the dead_threads list, as last reference 110 * is gone. 111 */ 112 list_del_init(&thread->node); 113 thread__delete(thread); 114 } 115 } 116 117 struct 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 } 124 125 int 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 * setns syscall must have changed few or all the namespaces 139 * of this thread. Update end time for the namespaces 140 * previously used. 141 */ 142 curr = list_next_entry(new, list); 143 curr->end_time = timestamp; 144 } 145 146 return 0; 147 } 148 149 struct 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 } 156 157 struct 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 } 169 170 int __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 /* Override the default :tid entry */ 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 } 194 195 int 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 } 211 212 const 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 /* CHECKME: it should probably better return the max comm len from its comm list */ 223 int 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 } 234 235 size_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 } 240 241 int 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 } 254 255 static 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 } 277 278 static 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 } 287 288 static int thread__clone_map_groups(struct thread *thread, 289 struct thread *parent) 290 { 291 int i; 292 293 /* This is new thread, we share map groups for process. */ 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 /* 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) 306 return -ENOMEM; 307 308 return 0; 309 } 310 311 int 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 } 326 327 void 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 } 345 346 struct 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