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 /* Thread holds first ref to nsdata. */ 63 thread->nsinfo = nsinfo__new(pid); 64 } 65 66 return thread; 67 68 err_thread: 69 free(thread); 70 return NULL; 71 } 72 73 void thread__delete(struct thread *thread) 74 { 75 struct namespaces *namespaces, *tmp_namespaces; 76 struct comm *comm, *tmp_comm; 77 78 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node)); 79 80 thread_stack__free(thread); 81 82 if (thread->mg) { 83 map_groups__put(thread->mg); 84 thread->mg = NULL; 85 } 86 list_for_each_entry_safe(namespaces, tmp_namespaces, 87 &thread->namespaces_list, list) { 88 list_del(&namespaces->list); 89 namespaces__free(namespaces); 90 } 91 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) { 92 list_del(&comm->list); 93 comm__free(comm); 94 } 95 unwind__finish_access(thread); 96 nsinfo__zput(thread->nsinfo); 97 98 free(thread); 99 } 100 101 struct thread *thread__get(struct thread *thread) 102 { 103 if (thread) 104 refcount_inc(&thread->refcnt); 105 return thread; 106 } 107 108 void thread__put(struct thread *thread) 109 { 110 if (thread && refcount_dec_and_test(&thread->refcnt)) { 111 /* 112 * Remove it from the dead_threads list, as last reference 113 * is gone. 114 */ 115 list_del_init(&thread->node); 116 thread__delete(thread); 117 } 118 } 119 120 struct namespaces *thread__namespaces(const struct thread *thread) 121 { 122 if (list_empty(&thread->namespaces_list)) 123 return NULL; 124 125 return list_first_entry(&thread->namespaces_list, struct namespaces, list); 126 } 127 128 int thread__set_namespaces(struct thread *thread, u64 timestamp, 129 struct namespaces_event *event) 130 { 131 struct namespaces *new, *curr = thread__namespaces(thread); 132 133 new = namespaces__new(event); 134 if (!new) 135 return -ENOMEM; 136 137 list_add(&new->list, &thread->namespaces_list); 138 139 if (timestamp && curr) { 140 /* 141 * setns syscall must have changed few or all the namespaces 142 * of this thread. Update end time for the namespaces 143 * previously used. 144 */ 145 curr = list_next_entry(new, list); 146 curr->end_time = timestamp; 147 } 148 149 return 0; 150 } 151 152 struct comm *thread__comm(const struct thread *thread) 153 { 154 if (list_empty(&thread->comm_list)) 155 return NULL; 156 157 return list_first_entry(&thread->comm_list, struct comm, list); 158 } 159 160 struct comm *thread__exec_comm(const struct thread *thread) 161 { 162 struct comm *comm, *last = NULL; 163 164 list_for_each_entry(comm, &thread->comm_list, list) { 165 if (comm->exec) 166 return comm; 167 last = comm; 168 } 169 170 return last; 171 } 172 173 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, 174 bool exec) 175 { 176 struct comm *new, *curr = thread__comm(thread); 177 178 /* Override the default :tid entry */ 179 if (!thread->comm_set) { 180 int err = comm__override(curr, str, timestamp, exec); 181 if (err) 182 return err; 183 } else { 184 new = comm__new(str, timestamp, exec); 185 if (!new) 186 return -ENOMEM; 187 list_add(&new->list, &thread->comm_list); 188 189 if (exec) 190 unwind__flush_access(thread); 191 } 192 193 thread->comm_set = true; 194 195 return 0; 196 } 197 198 int thread__set_comm_from_proc(struct thread *thread) 199 { 200 char path[64]; 201 char *comm = NULL; 202 size_t sz; 203 int err = -1; 204 205 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) { 208 comm[sz - 1] = '\0'; 209 err = thread__set_comm(thread, comm, 0); 210 } 211 212 return err; 213 } 214 215 const char *thread__comm_str(const struct thread *thread) 216 { 217 const struct comm *comm = thread__comm(thread); 218 219 if (!comm) 220 return NULL; 221 222 return comm__str(comm); 223 } 224 225 /* CHECKME: it should probably better return the max comm len from its comm list */ 226 int thread__comm_len(struct thread *thread) 227 { 228 if (!thread->comm_len) { 229 const char *comm = thread__comm_str(thread); 230 if (!comm) 231 return 0; 232 thread->comm_len = strlen(comm); 233 } 234 235 return thread->comm_len; 236 } 237 238 size_t thread__fprintf(struct thread *thread, FILE *fp) 239 { 240 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) + 241 map_groups__fprintf(thread->mg, fp); 242 } 243 244 int thread__insert_map(struct thread *thread, struct map *map) 245 { 246 int ret; 247 248 ret = unwind__prepare_access(thread, map, NULL); 249 if (ret) 250 return ret; 251 252 map_groups__fixup_overlappings(thread->mg, map, stderr); 253 map_groups__insert(thread->mg, map); 254 255 return 0; 256 } 257 258 static int __thread__prepare_access(struct thread *thread) 259 { 260 bool initialized = false; 261 int i, err = 0; 262 263 for (i = 0; i < MAP__NR_TYPES; ++i) { 264 struct maps *maps = &thread->mg->maps[i]; 265 struct map *map; 266 267 pthread_rwlock_rdlock(&maps->lock); 268 269 for (map = maps__first(maps); map; map = map__next(map)) { 270 err = unwind__prepare_access(thread, map, &initialized); 271 if (err || initialized) 272 break; 273 } 274 275 pthread_rwlock_unlock(&maps->lock); 276 } 277 278 return err; 279 } 280 281 static int thread__prepare_access(struct thread *thread) 282 { 283 int err = 0; 284 285 if (symbol_conf.use_callchain) 286 err = __thread__prepare_access(thread); 287 288 return err; 289 } 290 291 static int thread__clone_map_groups(struct thread *thread, 292 struct thread *parent) 293 { 294 int i; 295 296 /* This is new thread, we share map groups for process. */ 297 if (thread->pid_ == parent->pid_) 298 return thread__prepare_access(thread); 299 300 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); 303 return 0; 304 } 305 306 /* 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) 309 return -ENOMEM; 310 311 return 0; 312 } 313 314 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp) 315 { 316 if (parent->comm_set) { 317 const char *comm = thread__comm_str(parent); 318 int err; 319 if (!comm) 320 return -ENOMEM; 321 err = thread__set_comm(thread, comm, timestamp); 322 if (err) 323 return err; 324 } 325 326 thread->ppid = parent->tid; 327 return thread__clone_map_groups(thread, parent); 328 } 329 330 void thread__find_cpumode_addr_location(struct thread *thread, 331 enum map_type type, u64 addr, 332 struct addr_location *al) 333 { 334 size_t i; 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 340 }; 341 342 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) { 343 thread__find_addr_location(thread, cpumodes[i], type, addr, al); 344 if (al->map) 345 break; 346 } 347 } 348 349 struct thread *thread__main_thread(struct machine *machine, struct thread *thread) 350 { 351 if (thread->pid_ == thread->tid) 352 return thread__get(thread); 353 354 if (thread->pid_ == -1) 355 return NULL; 356 357 return machine__find_thread(machine, thread->pid_, thread->pid_); 358 } 359