kernel/tools/perf/util/thread.c

   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 }