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