--- old/src/hotspot/share/gc/shenandoah/shenandoahWorkerPolicy.cpp	2019-06-18 16:48:06.630070951 -0400
+++ new/src/hotspot/share/gc/shenandoah/shenandoahWorkerPolicy.cpp	2019-06-18 16:48:06.146070246 -0400
@@ -30,6 +30,7 @@
 uint ShenandoahWorkerPolicy::_prev_par_marking     = 0;
 uint ShenandoahWorkerPolicy::_prev_conc_marking    = 0;
 uint ShenandoahWorkerPolicy::_prev_conc_evac       = 0;
+uint ShenandoahWorkerPolicy::_prev_conc_root_proc  = 0;
 uint ShenandoahWorkerPolicy::_prev_fullgc          = 0;
 uint ShenandoahWorkerPolicy::_prev_degengc         = 0;
 uint ShenandoahWorkerPolicy::_prev_stw_traversal   = 0;
@@ -63,6 +64,16 @@
   return _prev_par_marking;
 }
 
+// Calculate workers for concurrent root processing
+uint ShenandoahWorkerPolicy::calc_workers_for_conc_root_processing() {
+  uint active_workers = (_prev_conc_root_proc == 0) ? ConcGCThreads : _prev_conc_root_proc;
+  _prev_conc_root_proc =
+    WorkerPolicy::calc_active_conc_workers(ConcGCThreads,
+                                           active_workers,
+                                           Threads::number_of_non_daemon_threads());
+  return _prev_conc_root_proc;
+}
+
 // Calculate workers for concurrent evacuation (concurrent GC)
 uint ShenandoahWorkerPolicy::calc_workers_for_conc_evac() {
   uint active_workers = (_prev_conc_evac == 0) ? ConcGCThreads : _prev_conc_evac;