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                 atomic_set(&thread->refcnt, 0);
  57                 INIT_LIST_HEAD(&thread->node);
  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         BUG_ON(!list_empty(&thread->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                 list_del_init(&thread->node);
 101                 thread__delete(thread);
 102         }
 103 }
 104
 105 struct comm *thread__comm(const struct thread *thread)
 106 {
 107         if (list_empty(&thread->comm_list))
 108                 return NULL;
 109
 110         return list_first_entry(&thread->comm_list, struct comm, list);
 111 }
 112
 113 struct comm *thread__exec_comm(const struct thread *thread)
 114 {
 115         struct comm *comm, *last = NULL;
 116
 117         list_for_each_entry(comm, &thread->comm_list, list) {
 118                 if (comm->exec)
 119                         return comm;
 120                 last = comm;
 121         }
 122
 123         return last;
 124 }
 125
 126 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
 127                        bool exec)
 128 {
 129         struct comm *new, *curr = thread__comm(thread);
 130         int err;
 131
 132         /* Override the default :tid entry */
 133         if (!thread->comm_set) {
 134                 err = comm__override(curr, str, timestamp, exec);
 135                 if (err)
 136                         return err;
 137         } else {
 138                 new = comm__new(str, timestamp, exec);
 139                 if (!new)
 140                         return -ENOMEM;
 141                 list_add(&new->list, &thread->comm_list);
 142
 143                 if (exec)
 144                         unwind__flush_access(thread);
 145         }
 146
 147         thread->comm_set = true;
 148
 149         return 0;
 150 }
 151
 152 const char *thread__comm_str(const struct thread *thread)
 153 {
 154         const struct comm *comm = thread__comm(thread);
 155
 156         if (!comm)
 157                 return NULL;
 158
 159         return comm__str(comm);
 160 }
 161
 162 /* CHECKME: it should probably better return the max comm len from its comm list */
 163 int thread__comm_len(struct thread *thread)
 164 {
 165         if (!thread->comm_len) {
 166                 const char *comm = thread__comm_str(thread);
 167                 if (!comm)
 168                         return 0;
 169                 thread->comm_len = strlen(comm);
 170         }
 171
 172         return thread->comm_len;
 173 }
 174
 175 size_t thread__fprintf(struct thread *thread, FILE *fp)
 176 {
 177         return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
 178                map_groups__fprintf(thread->mg, fp);
 179 }
 180
 181 void thread__insert_map(struct thread *thread, struct map *map)
 182 {
 183         map_groups__fixup_overlappings(thread->mg, map, stderr);
 184         map_groups__insert(thread->mg, map);
 185 }
 186
 187 static int thread__clone_map_groups(struct thread *thread,
 188                                     struct thread *parent)
 189 {
 190         int i;
 191
 192         /* This is new thread, we share map groups for process. */
 193         if (thread->pid_ == parent->pid_)
 194                 return 0;
 195
 196         /* But this one is new process, copy maps. */
 197         for (i = 0; i < MAP__NR_TYPES; ++i)
 198                 if (map_groups__clone(thread->mg, parent->mg, i) < 0)
 199                         return -ENOMEM;
 200
 201         return 0;
 202 }
 203
 204 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
 205 {
 206         int err;
 207
 208         if (parent->comm_set) {
 209                 const char *comm = thread__comm_str(parent);
 210                 if (!comm)
 211                         return -ENOMEM;
 212                 err = thread__set_comm(thread, comm, timestamp);
 213                 if (err)
 214                         return err;
 215         }
 216
 217         thread->ppid = parent->tid;
 218         return thread__clone_map_groups(thread, parent);
 219 }
 220
 221 void thread__find_cpumode_addr_location(struct thread *thread,
 222                                         enum map_type type, u64 addr,
 223                                         struct addr_location *al)
 224 {
 225         size_t i;
 226         const u8 const cpumodes[] = {
 227                 PERF_RECORD_MISC_USER,
 228                 PERF_RECORD_MISC_KERNEL,
 229                 PERF_RECORD_MISC_GUEST_USER,
 230                 PERF_RECORD_MISC_GUEST_KERNEL
 231         };
 232
 233         for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
 234                 thread__find_addr_location(thread, cpumodes[i], type, addr, al);
 235                 if (al->map)
 236                         break;
 237         }
 238 }