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 #include "unwind.h"
  11
  12 int thread__init_map_groups(struct thread *thread, struct machine *machine)
  13 {
  14         struct thread *leader;
  15         pid_t pid = thread->pid_;
  16
  17         if (pid == thread->tid || pid == -1) {
  18                 thread->mg = map_groups__new();
  19         } else {
  20                 leader = machine__findnew_thread(machine, pid, pid);
  21                 if (leader)
  22                         thread->mg = map_groups__get(leader->mg);
  23         }
  24
  25         return thread->mg ? 0 : -1;
  26 }
  27
  28 struct thread *thread__new(pid_t pid, pid_t tid)
  29 {
  30         char *comm_str;
  31         struct comm *comm;
  32         struct thread *thread = zalloc(sizeof(*thread));
  33
  34         if (thread != NULL) {
  35                 thread->pid_ = pid;
  36                 thread->tid = tid;
  37                 thread->ppid = -1;
  38                 thread->cpu = -1;
  39                 INIT_LIST_HEAD(&thread->comm_list);
  40
  41                 if (unwind__prepare_access(thread) < 0)
  42                         goto err_thread;
  43
  44                 comm_str = malloc(32);
  45                 if (!comm_str)
  46                         goto err_thread;
  47
  48                 snprintf(comm_str, 32, ":%d", tid);
  49                 comm = comm__new(comm_str, 0, false);
  50                 free(comm_str);
  51                 if (!comm)
  52                         goto err_thread;
  53
  54                 list_add(&comm->list, &thread->comm_list);
  55
  56         }
  57
  58         return thread;
  59
  60 err_thread:
  61         free(thread);
  62         return NULL;
  63 }
  64
  65 void thread__delete(struct thread *thread)
  66 {
  67         struct comm *comm, *tmp;
  68
  69         if (thread->mg) {
  70                 map_groups__put(thread->mg);
  71                 thread->mg = NULL;
  72         }
  73         list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
  74                 list_del(&comm->list);
  75                 comm__free(comm);
  76         }
  77         unwind__finish_access(thread);
  78
  79         free(thread);
  80 }
  81
  82 struct comm *thread__comm(const struct thread *thread)
  83 {
  84         if (list_empty(&thread->comm_list))
  85                 return NULL;
  86
  87         return list_first_entry(&thread->comm_list, struct comm, list);
  88 }
  89
  90 struct comm *thread__exec_comm(const struct thread *thread)
  91 {
  92         struct comm *comm, *last = NULL;
  93
  94         list_for_each_entry(comm, &thread->comm_list, list) {
  95                 if (comm->exec)
  96                         return comm;
  97                 last = comm;
  98         }
  99
 100         return last;
 101 }
 102
 103 /* CHECKME: time should always be 0 if event aren't ordered */
 104 int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
 105                        bool exec)
 106 {
 107         struct comm *new, *curr = thread__comm(thread);
 108         int err;
 109
 110         /* Override latest entry if it had no specific time coverage */
 111         if (!curr->start && !curr->exec) {
 112                 err = comm__override(curr, str, timestamp, exec);
 113                 if (err)
 114                         return err;
 115         } else {
 116                 new = comm__new(str, timestamp, exec);
 117                 if (!new)
 118                         return -ENOMEM;
 119                 list_add(&new->list, &thread->comm_list);
 120
 121                 if (exec)
 122                         unwind__flush_access(thread);
 123         }
 124
 125         thread->comm_set = true;
 126
 127         return 0;
 128 }
 129
 130 const char *thread__comm_str(const struct thread *thread)
 131 {
 132         const struct comm *comm = thread__comm(thread);
 133
 134         if (!comm)
 135                 return NULL;
 136
 137         return comm__str(comm);
 138 }
 139
 140 /* CHECKME: it should probably better return the max comm len from its comm list */
 141 int thread__comm_len(struct thread *thread)
 142 {
 143         if (!thread->comm_len) {
 144                 const char *comm = thread__comm_str(thread);
 145                 if (!comm)
 146                         return 0;
 147                 thread->comm_len = strlen(comm);
 148         }
 149
 150         return thread->comm_len;
 151 }
 152
 153 size_t thread__fprintf(struct thread *thread, FILE *fp)
 154 {
 155         return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
 156                map_groups__fprintf(thread->mg, fp);
 157 }
 158
 159 void thread__insert_map(struct thread *thread, struct map *map)
 160 {
 161         map_groups__fixup_overlappings(thread->mg, map, stderr);
 162         map_groups__insert(thread->mg, map);
 163 }
 164
 165 static int thread__clone_map_groups(struct thread *thread,
 166                                     struct thread *parent)
 167 {
 168         int i;
 169
 170         /* This is new thread, we share map groups for process. */
 171         if (thread->pid_ == parent->pid_)
 172                 return 0;
 173
 174         /* But this one is new process, copy maps. */
 175         for (i = 0; i < MAP__NR_TYPES; ++i)
 176                 if (map_groups__clone(thread->mg, parent->mg, i) < 0)
 177                         return -ENOMEM;
 178
 179         return 0;
 180 }
 181
 182 int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp)
 183 {
 184         int err;
 185
 186         if (parent->comm_set) {
 187                 const char *comm = thread__comm_str(parent);
 188                 if (!comm)
 189                         return -ENOMEM;
 190                 err = thread__set_comm(thread, comm, timestamp);
 191                 if (err)
 192                         return err;
 193                 thread->comm_set = true;
 194         }
 195
 196         thread->ppid = parent->tid;
 197         return thread__clone_map_groups(thread, parent);
 198 }
 199
 200 void thread__find_cpumode_addr_location(struct thread *thread,
 201                                         struct machine *machine,
 202                                         enum map_type type, u64 addr,
 203                                         struct addr_location *al)
 204 {
 205         size_t i;
 206         const u8 const cpumodes[] = {
 207                 PERF_RECORD_MISC_USER,
 208                 PERF_RECORD_MISC_KERNEL,
 209                 PERF_RECORD_MISC_GUEST_USER,
 210                 PERF_RECORD_MISC_GUEST_KERNEL
 211         };
 212
 213         for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
 214                 thread__find_addr_location(thread, machine, cpumodes[i], type,
 215                                            addr, al);
 216                 if (al->map)
 217                         break;
 218         }
 219 }