--- /dev/null	2020-01-17 11:46:19.065201212 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahWorkerPolicy.hpp	2020-01-17 17:10:53.985128061 +0100
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2017, 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_SHENANDOAH_SHENANDOAHWORKERPOLICY_HPP
+#define SHARE_VM_GC_SHENANDOAH_SHENANDOAHWORKERPOLICY_HPP
+
+#include "memory/allocation.hpp"
+
+class ShenandoahWorkerPolicy : AllStatic {
+private:
+  static uint _prev_par_marking;
+  static uint _prev_conc_marking;
+  static uint _prev_conc_evac;
+  static uint _prev_fullgc;
+  static uint _prev_degengc;
+  static uint _prev_stw_traversal;
+  static uint _prev_conc_traversal;
+  static uint _prev_conc_update_ref;
+  static uint _prev_par_update_ref;
+  static uint _prev_conc_cleanup;
+  static uint _prev_conc_reset;
+
+public:
+  // Calculate the number of workers for initial marking
+  static uint calc_workers_for_init_marking();
+
+  // Calculate the number of workers for concurrent marking
+  static uint calc_workers_for_conc_marking();
+
+  // Calculate the number of workers for final marking
+  static uint calc_workers_for_final_marking();
+
+  // Calculate workers for concurrent evacuation (concurrent GC)
+  static uint calc_workers_for_conc_evac();
+
+  // Calculate workers for parallel full gc
+  static uint calc_workers_for_fullgc();
+
+  // Calculate workers for parallel degenerated gc
+  static uint calc_workers_for_stw_degenerated();
+
+  // Calculate workers for Stop-the-world traversal GC
+  static uint calc_workers_for_stw_traversal();
+
+  // Calculate workers for concurrent traversal GC
+  static uint calc_workers_for_conc_traversal();
+
+  // Calculate workers for concurrent reference update
+  static uint calc_workers_for_conc_update_ref();
+
+  // Calculate workers for parallel/final reference update
+  static uint calc_workers_for_final_update_ref();
+
+  // Calculate workers for concurrent precleaning
+  static uint calc_workers_for_conc_preclean();
+
+  // Calculate workers for concurrent cleanup
+  static uint calc_workers_for_conc_cleanup();
+
+  // Calculate workers for concurrent reset
+  static uint calc_workers_for_conc_reset();
+};
+
+#endif // SHARE_VM_GC_SHENANDOAH_SHENANDOAHWORKERPOLICY_HPP