--- old/src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp	2020-04-25 20:53:29.935345213 +0800
+++ new/src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp	2020-04-25 20:53:29.755345763 +0800
@@ -536,6 +536,12 @@
   old_gen()->object_iterate(cl);
 }
 
+Tickspan ParallelScavengeHeap::run_task(AbstractGangTask* task) {
+  Ticks start = Ticks::now();
+  _workers.run_task(task);
+  return Ticks::now() - start;
+}
+
 
 HeapWord* ParallelScavengeHeap::block_start(const void* addr) const {
   if (young_gen()->is_in_reserved(addr)) {