--- /dev/null	2018-04-03 12:55:20.301839954 +0200
+++ new/src/hotspot/share/gc/z/zAllocationFlags.hpp	2018-06-08 19:45:52.702527803 +0200
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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_GC_Z_ZALLOCATIONFLAGS_HPP
+#define SHARE_GC_Z_ZALLOCATIONFLAGS_HPP
+
+#include "gc/z/zBitField.hpp"
+#include "memory/allocation.hpp"
+
+//
+// Allocation flags layout
+// -----------------------
+//
+//   7   4 3 2 1 0
+//  +---+-+-+-+-+-+
+//  |000|1|1|1|1|1|
+//  +---+-+-+-+-+-+
+//  |   | | | | |
+//  |   | | | | * 0-0 Java Thread Flag (1-bit)
+//  |   | | | |
+//  |   | | | * 1-1 Worker Thread Flag (1-bit)
+//  |   | | |
+//  |   | | * 2-2 Non-Blocking Flag (1-bit)
+//  |   | |
+//  |   | * 3-3 Relocation Flag (1-bit)
+//  |   |
+//  |   * 4-4 No Reserve Flag (1-bit)
+//  |
+//  * 7-5 Unused (3-bits)
+//
+
+class ZAllocationFlags {
+private:
+  typedef ZBitField<uint8_t, bool, 0, 1> field_java_thread;
+  typedef ZBitField<uint8_t, bool, 1, 1> field_worker_thread;
+  typedef ZBitField<uint8_t, bool, 2, 1> field_non_blocking;
+  typedef ZBitField<uint8_t, bool, 3, 1> field_relocation;
+  typedef ZBitField<uint8_t, bool, 4, 1> field_no_reserve;
+
+  uint8_t _flags;
+
+public:
+  ZAllocationFlags() :
+      _flags(0) {}
+
+  void set_java_thread() {
+    _flags |= field_java_thread::encode(true);
+  }
+
+  void set_worker_thread() {
+    _flags |= field_worker_thread::encode(true);
+  }
+
+  void set_non_blocking() {
+    _flags |= field_non_blocking::encode(true);
+  }
+
+  void set_relocation() {
+    _flags |= field_relocation::encode(true);
+  }
+
+  void set_no_reserve() {
+    _flags |= field_no_reserve::encode(true);
+  }
+
+  bool java_thread() const {
+    return field_java_thread::decode(_flags);
+  }
+
+  bool worker_thread() const {
+    return field_worker_thread::decode(_flags);
+  }
+
+  bool non_blocking() const {
+    return field_non_blocking::decode(_flags);
+  }
+
+  bool relocation() const {
+    return field_relocation::decode(_flags);
+  }
+
+  bool no_reserve() const {
+    return field_no_reserve::decode(_flags);
+  }
+};
+
+#endif // SHARE_GC_Z_ZALLOCATIONFLAGS_HPP