--- old/src/hotspot/share/gc/shared/gcVMOperations.hpp	2020-04-27 10:20:17.475864811 +0200
+++ new/src/hotspot/share/gc/shared/gcVMOperations.hpp	2020-04-27 10:20:17.287861750 +0200
@@ -125,12 +125,15 @@
  private:
   outputStream* _out;
   bool _full_gc;
+  size_t _parallel_thread_num;
  public:
-  VM_GC_HeapInspection(outputStream* out, bool request_full_gc) :
+  VM_GC_HeapInspection(outputStream* out, bool request_full_gc,
+                       size_t 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) {}
+                    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; }