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
  10 /* Skip "." and ".." directories */
  11 static int filter(const struct dirent *dir)
  12 {
  13         if (dir->d_name[0] == '.')
  14                 return 0;
  15         else
  16                 return 1;
  17 }
  18
  19 int find_all_tid(int pid, pid_t ** all_tid)
  20 {
  21         char name[256];
  22         int items;
  23         struct dirent **namelist = NULL;
  24         int ret = 0;
  25         int i;
  26
  27         sprintf(name, "/proc/%d/task", pid);
  28         items = scandir(name, &namelist, filter, NULL);
  29         if (items <= 0)
  30                 return -ENOENT;
  31         *all_tid = malloc(sizeof(pid_t) * items);
  32         if (!*all_tid) {
  33                 ret = -ENOMEM;
  34                 goto failure;
  35         }
  36
  37         for (i = 0; i < items; i++)
  38                 (*all_tid)[i] = atoi(namelist[i]->d_name);
  39
  40         ret = items;
  41
  42 failure:
  43         for (i=0; i<items; i++)
  44                 free(namelist[i]);
  45         free(namelist);
  46
  47         return ret;
  48 }
  49
  50 static struct thread *thread__new(pid_t pid)
  51 {
  52         struct thread *self = zalloc(sizeof(*self));
  53
  54         if (self != NULL) {
  55                 map_groups__init(&self->mg);
  56                 self->pid = pid;
  57                 self->comm = malloc(32);
  58                 if (self->comm)
  59                         snprintf(self->comm, 32, ":%d", self->pid);
  60         }
  61
  62         return self;
  63 }
  64
  65 void thread__delete(struct thread *self)
  66 {
  67         map_groups__exit(&self->mg);
  68         free(self->comm);
  69         free(self);
  70 }
  71
  72 int thread__set_comm(struct thread *self, const char *comm)
  73 {
  74         int err;
  75
  76         if (self->comm)
  77                 free(self->comm);
  78         self->comm = strdup(comm);
  79         err = self->comm == NULL ? -ENOMEM : 0;
  80         if (!err) {
  81                 self->comm_set = true;
  82                 map_groups__flush(&self->mg);
  83         }
  84         return err;
  85 }
  86
  87 int thread__comm_len(struct thread *self)
  88 {
  89         if (!self->comm_len) {
  90                 if (!self->comm)
  91                         return 0;
  92                 self->comm_len = strlen(self->comm);
  93         }
  94
  95         return self->comm_len;
  96 }
  97
  98 static size_t thread__fprintf(struct thread *self, FILE *fp)
  99 {
 100         return fprintf(fp, "Thread %d %s\n", self->pid, self->comm) +
 101                map_groups__fprintf(&self->mg, verbose, fp);
 102 }
 103
 104 struct thread *perf_session__findnew(struct perf_session *self, pid_t pid)
 105 {
 106         struct rb_node **p = &self->threads.rb_node;
 107         struct rb_node *parent = NULL;
 108         struct thread *th;
 109
 110         /*
 111          * Font-end cache - PID lookups come in blocks,
 112          * so most of the time we dont have to look up
 113          * the full rbtree:
 114          */
 115         if (self->last_match && self->last_match->pid == pid)
 116                 return self->last_match;
 117
 118         while (*p != NULL) {
 119                 parent = *p;
 120                 th = rb_entry(parent, struct thread, rb_node);
 121
 122                 if (th->pid == pid) {
 123                         self->last_match = th;
 124                         return th;
 125                 }
 126
 127                 if (pid < th->pid)
 128                         p = &(*p)->rb_left;
 129                 else
 130                         p = &(*p)->rb_right;
 131         }
 132
 133         th = thread__new(pid);
 134         if (th != NULL) {
 135                 rb_link_node(&th->rb_node, parent, p);
 136                 rb_insert_color(&th->rb_node, &self->threads);
 137                 self->last_match = th;
 138         }
 139
 140         return th;
 141 }
 142
 143 void thread__insert_map(struct thread *self, struct map *map)
 144 {
 145         map_groups__fixup_overlappings(&self->mg, map, verbose, stderr);
 146         map_groups__insert(&self->mg, map);
 147 }
 148
 149 int thread__fork(struct thread *self, struct thread *parent)
 150 {
 151         int i;
 152
 153         if (parent->comm_set) {
 154                 if (self->comm)
 155                         free(self->comm);
 156                 self->comm = strdup(parent->comm);
 157                 if (!self->comm)
 158                         return -ENOMEM;
 159                 self->comm_set = true;
 160         }
 161
 162         for (i = 0; i < MAP__NR_TYPES; ++i)
 163                 if (map_groups__clone(&self->mg, &parent->mg, i) < 0)
 164                         return -ENOMEM;
 165         return 0;
 166 }
 167
 168 size_t perf_session__fprintf(struct perf_session *self, FILE *fp)
 169 {
 170         size_t ret = 0;
 171         struct rb_node *nd;
 172
 173         for (nd = rb_first(&self->threads); nd; nd = rb_next(nd)) {
 174                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 175
 176                 ret += thread__fprintf(pos, fp);
 177         }
 178
 179         return ret;
 180 }