--- /dev/null	2018-04-03 12:55:20.301839954 +0200
+++ new/src/hotspot/share/gc/z/zRuntimeWorkers.cpp	2018-05-08 14:42:31.033772815 +0200
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2018, 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.
+ */
+
+#include "precompiled.hpp"
+#include "gc/z/zRuntimeWorkers.hpp"
+
+ZRuntimeWorkers::ZRuntimeWorkers() :
+    _workers("RuntimeWorker",
+             nworkers(),
+             false /* are_GC_task_threads */,
+             false /* are_ConcurrentGC_threads */) {
+
+  log_info(gc, init)("Runtime Workers: %u parallel", nworkers());
+
+  // Initialize worker threads
+  _workers.initialize_workers();
+  _workers.update_active_workers(nworkers());
+}
+
+uint ZRuntimeWorkers::nworkers() const {
+  return ParallelGCThreads;
+}
+
+WorkGang* ZRuntimeWorkers::workers() {
+  return &_workers;
+}
+
+void ZRuntimeWorkers::threads_do(ThreadClosure* tc) const {
+  _workers.threads_do(tc);
+}
+
+void ZRuntimeWorkers::print_threads_on(outputStream* st) const {
+  _workers.print_worker_threads_on(st);
+}