diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 890d855..bde6835 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -62,6 +62,9 @@
 	struct rb_node	  rb_node;
 	pid_t		  pid;
 	char		  *root_dir;
+	struct rb_root	  threads;
+	struct list_head  dead_threads;
+	struct thread	  *last_match;
 	struct list_head  user_dsos;
 	struct list_head  kernel_dsos;
 	struct map_groups kmaps;
@@ -190,6 +193,12 @@
 					       struct map **mapp,
 					       symbol_filter_t filter);
 
+
+struct thread *machine__findnew_thread(struct machine *machine, pid_t pid);
+void machine__remove_thread(struct machine *machine, struct thread *th);
+
+size_t machine__fprintf(struct machine *machine, FILE *fp);
+
 static inline
 struct symbol *machine__find_kernel_symbol(struct machine *self,
 					   enum map_type type, u64 addr,