--- old/src/hotspot/share/gc/parallel/psParallelCompact.cpp	2018-05-02 11:08:24.022960723 +0200
+++ new/src/hotspot/share/gc/parallel/psParallelCompact.cpp	2018-05-02 11:08:23.734951888 +0200
@@ -117,7 +117,7 @@
 
 SpaceInfo PSParallelCompact::_space_info[PSParallelCompact::last_space_id];
 
-SpanSubjectToDiscoveryClosure PSParallelCompact::_span_discoverer;
+SpanSubjectToDiscoveryClosure PSParallelCompact::_span_based_discoverer;
 ReferenceProcessor* PSParallelCompact::_ref_processor = NULL;
 
 double PSParallelCompact::_dwl_mean;
@@ -844,9 +844,9 @@
 
 void PSParallelCompact::post_initialize() {
   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
-  _span_discoverer.set_span(heap->reserved_region());
+  _span_based_discoverer.set_span(heap->reserved_region());
   _ref_processor =
-    new ReferenceProcessor(&_span_discoverer,   // span
+    new ReferenceProcessor(&_span_based_discoverer,
                            ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing
                            ParallelGCThreads,   // mt processing degree
                            true,                // mt discovery