--- old/src/hotspot/share/gc/shared/collectedHeap.hpp	2020-08-05 21:29:29.097604413 +0800
+++ new/src/hotspot/share/gc/shared/collectedHeap.hpp	2020-08-05 21:29:28.797604402 +0800
@@ -29,8 +29,8 @@
 #include "gc/shared/gcWhen.hpp"
 #include "gc/shared/verifyOption.hpp"
 #include "memory/allocation.hpp"
-#include "memory/universe.hpp"
 #include "memory/heapInspection.hpp"
+#include "memory/universe.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/perfData.hpp"
 #include "runtime/safepoint.hpp"
@@ -412,9 +412,6 @@
     return NULL;
   }
 
-  // Run given task. Possibly in parallel if the GC supports it.
-  virtual void run_task(AbstractGangTask* task) = 0;
-
   // Keep alive an object that was loaded with AS_NO_KEEPALIVE.
   virtual void keep_alive(oop obj) {}
 
@@ -461,6 +458,9 @@
   // Iterator for all GC threads (other than VM thread)
   virtual void gc_threads_do(ThreadClosure* tc) const = 0;
 
+  // Run given task. Possibly in parallel if the GC supports it.
+  virtual void run_task(AbstractGangTask* task) = 0;
+
   // Print any relevant tracing info that flags imply.
   // Default implementation does nothing.
   virtual void print_tracing_info() const = 0;