--- /dev/null	2018-04-05 19:09:31.849588610 +0200
+++ new/src/hotspot/share/gc/epsilon/epsilonThreadLocalData.hpp	2018-05-07 16:47:10.225109988 +0200
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_GC_EPSILON_EPSILONTHREADLOCALDATA_HPP
+#define SHARE_VM_GC_EPSILON_EPSILONTHREADLOCALDATA_HPP
+
+class EpsilonThreadLocalData {
+private:
+  size_t _ergo_tlab_size;
+
+  EpsilonThreadLocalData() :
+          _ergo_tlab_size(0) {}
+
+  static EpsilonThreadLocalData* data(Thread* thread) {
+    assert(UseEpsilonGC, "Sanity");
+    return thread->gc_data<EpsilonThreadLocalData>();
+  }
+
+public:
+  static void create(Thread* thread) {
+    new (data(thread)) EpsilonThreadLocalData();
+  }
+
+  static void destroy(Thread* thread) {
+    data(thread)->~EpsilonThreadLocalData();
+  }
+
+  static size_t ergo_tlab_size(Thread *thread) {
+    return data(thread)->_ergo_tlab_size;
+  }
+
+  static void set_ergo_tlab_size(Thread *thread, size_t val) {
+    data(thread)->_ergo_tlab_size = val;
+  }
+};
+
+#endif // SHARE_VM_GC_EPSILON_EPSILONTHREADLOCALDATA_HPP