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