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