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);
  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 /* CHECKME: time should always be 0 if event aren't ordered */
  85 int thread__set_comm(struct thread *thread, const char *str, u64 timestamp)
  86 {
  87         struct comm *new, *curr = thread__comm(thread);
  88         int err;
  89
  90         /* Override latest entry if it had no specific time coverage */
  91         if (!curr->start) {
  92                 err = comm__override(curr, str, timestamp);
  93                 if (err)
  94                         return err;
  95         } else {
  96                 new = comm__new(str, timestamp);
  97                 if (!new)
  98                         return -ENOMEM;
  99                 list_add(&new->list, &thread->comm_list);
 100         }
 101
 102         thread->comm_set = true;
 103
 104         return 0;
 105 }
 106
 107 const char *thread__comm_str(const struct thread *thread)
 108 {
 109         const struct comm *comm = thread__comm(thread);
 110
 111         if (!comm)
 112                 return NULL;
 113
 114         return comm__str(comm);
 115 }
 116
 117 /* CHECKME: it should probably better return the max comm len from its comm list */
 118 int thread__comm_len(struct thread *thread)
 119 {
 120         if (!thread->comm_len) {
 121                 const char *comm = thread__comm_str(thread);
 122                 if (!comm)
 123                         return 0;
 124                 thread->comm_len = strlen(comm);
 125         }
 126
 127         return thread->comm_len;
 128 }
 129
 130 size_t thread__fprintf(struct thread *thread, FILE *fp)
 131 {
 132         return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
 133                map_groups__fprintf(thread->mg, fp);
 134 }
 135
 136 void thread__insert_map(struct thread *thread, struct map *map)
 137 {
 138         map_groups__fixup_overlappings(thread->mg, map, stderr);
 139         map_groups__insert(thread->mg, map);
 140 }
 141
 142 static int thread__clone_map_groups(struct thread *thread,
 143                                     struct thread *parent)
 144 {
 145         int i;
 146
 147         /* This is new thread, we share map groups for process. */
 148         if (thread->pid_ == parent->pid_)
 149                 return 0;
 150
 151         /* But this one is new process, copy maps. */
 152         for (i = 0; i < MAP__NR_TYPES; ++i)
 153                 if (map_groups__clone(thread->mg, parent->mg, i) < 0)
 154                         return -ENOMEM;
 155
 156         return 0;
 157 }
 158
 159 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
 160 {
 161         int err;
 162
 163         if (parent->comm_set) {
 164                 const char *comm = thread__comm_str(parent);
 165                 if (!comm)
 166                         return -ENOMEM;
 167                 err = thread__set_comm(thread, comm, timestamp);
 168                 if (err)
 169                         return err;
 170                 thread->comm_set = true;
 171         }
 172
 173         thread->ppid = parent->tid;
 174         return thread__clone_map_groups(thread, parent);
 175 }
 176
 177 void thread__find_cpumode_addr_location(struct thread *thread,
 178                                         struct machine *machine,
 179                                         enum map_type type, u64 addr,
 180                                         struct addr_location *al)
 181 {
 182         size_t i;
 183         const u8 const cpumodes[] = {
 184                 PERF_RECORD_MISC_USER,
 185                 PERF_RECORD_MISC_KERNEL,
 186                 PERF_RECORD_MISC_GUEST_USER,
 187                 PERF_RECORD_MISC_GUEST_KERNEL
 188         };
 189
 190         for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
 191                 thread__find_addr_location(thread, machine, cpumodes[i], type,
 192                                            addr, al);
 193                 if (al->map)
 194                         break;
 195         }
 196 }