--- old/src/hotspot/share/gc/shared/gcVMOperations.hpp	2020-07-23 11:41:31.492368743 +0800
+++ new/src/hotspot/share/gc/shared/gcVMOperations.hpp	2020-07-23 11:41:31.332369437 +0800
@@ -125,12 +125,15 @@
  private:
   outputStream* _out;
   bool _full_gc;
+  uint _parallel_thread_num;
  public:
-  VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
-    VM_GC_Operation(0 /* total collections,      dummy, ignored */,
-                    GCCause::_heap_inspection /* GC Cause */,
-                    0 /* total full collections, dummy, ignored */,
-                    request_full_gc), _out(out), _full_gc(request_full_gc) {}
+  VM_GC_HeapInspection(outputStream* out, bool request_full_gc,
+                       uint parallel_thread_num = 1) :
+  VM_GC_Operation(0 /* total collections,      dummy, ignored */,
+                  GCCause::_heap_inspection /* GC Cause */,
+                  0 /* total full collections, dummy, ignored */,
+                  request_full_gc), _out(out), _full_gc(request_full_gc),
+                  _parallel_thread_num(parallel_thread_num) {}
 
   ~VM_GC_HeapInspection() {}
   virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; }