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 "util.h"
   8 #include "debug.h"
   9 #include "comm.h"
  10
  11 int thread__init_map_groups(struct thread *thread, struct machine *machine)
  12 {
  13         struct thread *leader;
  14         pid_t pid = thread->pid_;
  15
  16         if (pid == thread->tid || pid == -1) {
  17                 thread->mg = map_groups__new();
  18         } else {
  19                 leader = machine__findnew_thread(machine, pid, pid);
  20                 if (leader)
  21                         thread->mg = map_groups__get(leader->mg);
  22         }
  23
  24         return thread->mg ? 0 : -1;
  25 }
  26
  27 struct thread *thread__new(pid_t pid, pid_t tid)
  28 {
  29         char *comm_str;
  30         struct comm *comm;
  31         struct thread *thread = zalloc(sizeof(*thread));
  32
  33         if (thread != NULL) {
  34                 thread->pid_ = pid;
  35                 thread->tid = tid;
  36                 thread->ppid = -1;
  37                 thread->cpu = -1;
  38                 INIT_LIST_HEAD(&thread->comm_list);
  39
  40                 comm_str = malloc(32);
  41                 if (!comm_str)
  42                         goto err_thread;
  43
  44                 snprintf(comm_str, 32, ":%d", tid);
  45                 comm = comm__new(comm_str, 0, false);
  46                 free(comm_str);
  47                 if (!comm)
  48                         goto err_thread;
  49
  50                 list_add(&comm->list, &thread->comm_list);
  51         }
  52
  53         return thread;
  54
  55 err_thread:
  56         free(thread);
  57         return NULL;
  58 }
  59
  60 void thread__delete(struct thread *thread)
  61 {
  62         struct comm *comm, *tmp;
  63
  64         if (thread->mg) {
  65                 map_groups__put(thread->mg);
  66                 thread->mg = NULL;
  67         }
  68         list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
  69                 list_del(&comm->list);
  70                 comm__free(comm);
  71         }
  72
  73         free(thread);
  74 }
  75
  76 struct comm *thread__comm(const struct thread *thread)
  77 {
  78         if (list_empty(&thread->comm_list))
  79                 return NULL;
  80
  81         return list_first_entry(&thread->comm_list, struct comm, list);
  82 }
  83
  84 struct comm *thread__exec_comm(const struct thread *thread)
  85 {
  86         struct comm *comm, *last = NULL;
  87
  88         list_for_each_entry(comm, &thread->comm_list, list) {
  89                 if (comm->exec)
  90                         return comm;
  91                 last = comm;
  92         }
  93
  94         return last;
  95 }
  96
  97 /* CHECKME: time should always be 0 if event aren't ordered */
  98 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
  99                        bool exec)
 100 {
 101         struct comm *new, *curr = thread__comm(thread);
 102         int err;
 103
 104         /* Override latest entry if it had no specific time coverage */
 105         if (!curr->start && !curr->exec) {
 106                 err = comm__override(curr, str, timestamp, exec);
 107                 if (err)
 108                         return err;
 109         } else {
 110                 new = comm__new(str, timestamp, exec);
 111                 if (!new)
 112                         return -ENOMEM;
 113                 list_add(&new->list, &thread->comm_list);
 114         }
 115
 116         thread->comm_set = true;
 117
 118         return 0;
 119 }
 120
 121 const char *thread__comm_str(const struct thread *thread)
 122 {
 123         const struct comm *comm = thread__comm(thread);
 124
 125         if (!comm)
 126                 return NULL;
 127
 128         return comm__str(comm);
 129 }
 130
 131 /* CHECKME: it should probably better return the max comm len from its comm list */
 132 int thread__comm_len(struct thread *thread)
 133 {
 134         if (!thread->comm_len) {
 135                 const char *comm = thread__comm_str(thread);
 136                 if (!comm)
 137                         return 0;
 138                 thread->comm_len = strlen(comm);
 139         }
 140
 141         return thread->comm_len;
 142 }
 143
 144 size_t thread__fprintf(struct thread *thread, FILE *fp)
 145 {
 146         return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
 147                map_groups__fprintf(thread->mg, fp);
 148 }
 149
 150 void thread__insert_map(struct thread *thread, struct map *map)
 151 {
 152         map_groups__fixup_overlappings(thread->mg, map, stderr);
 153         map_groups__insert(thread->mg, map);
 154 }
 155
 156 static int thread__clone_map_groups(struct thread *thread,
 157                                     struct thread *parent)
 158 {
 159         int i;
 160
 161         /* This is new thread, we share map groups for process. */
 162         if (thread->pid_ == parent->pid_)
 163                 return 0;
 164
 165         /* But this one is new process, copy maps. */
 166         for (i = 0; i < MAP__NR_TYPES; ++i)
 167                 if (map_groups__clone(thread->mg, parent->mg, i) < 0)
 168                         return -ENOMEM;
 169
 170         return 0;
 171 }
 172
 173 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
 174 {
 175         int err;
 176
 177         if (parent->comm_set) {
 178                 const char *comm = thread__comm_str(parent);
 179                 if (!comm)
 180                         return -ENOMEM;
 181                 err = thread__set_comm(thread, comm, timestamp);
 182                 if (err)
 183                         return err;
 184                 thread->comm_set = true;
 185         }
 186
 187         thread->ppid = parent->tid;
 188         return thread__clone_map_groups(thread, parent);
 189 }
 190
 191 void thread__find_cpumode_addr_location(struct thread *thread,
 192                                         struct machine *machine,
 193                                         enum map_type type, u64 addr,
 194                                         struct addr_location *al)
 195 {
 196         size_t i;
 197         const u8 const cpumodes[] = {
 198                 PERF_RECORD_MISC_USER,
 199                 PERF_RECORD_MISC_KERNEL,
 200                 PERF_RECORD_MISC_GUEST_USER,
 201                 PERF_RECORD_MISC_GUEST_KERNEL
 202         };
 203
 204         for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
 205                 thread__find_addr_location(thread, machine, cpumodes[i], type,
 206                                            addr, al);
 207                 if (al->map)
 208                         break;
 209         }
 210 }