--- old/src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp	2020-07-29 15:26:46.819931341 +0800
+++ new/src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp	2020-07-29 15:26:46.535931330 +0800
@@ -617,6 +617,10 @@
   void tlabs_retire(bool resize);
   void gclabs_retire(bool resize);
 
+  // Runs the given AbstractGangTask with the current active workers.
+  // Returns the total time to run the task.
+  virtual void run_task(AbstractGangTask* task);
+
 // ---------- Marking support
 //
 private: