--- old/src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp	2020-08-08 18:28:51.233614666 +0800
+++ new/src/hotspot/share/gc/parallel/parallelScavengeHeap.hpp	2020-08-08 18:28:51.069615227 +0800
@@ -218,6 +218,8 @@
   virtual void print_on(outputStream* st) const;
   virtual void print_on_error(outputStream* st) const;
   virtual void gc_threads_do(ThreadClosure* tc) const;
+  // Runs the given AbstractGangTask with the current active workers.
+  virtual void run_task(AbstractGangTask* task);
   virtual void print_tracing_info() const;
 
   virtual WorkGang* get_safepoint_workers() { return &_workers; }