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