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                         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 }