diff a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
--- a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp
@@ -628,10 +628,15 @@
 
   // Do anything common to GC's.
   void gc_prologue(bool full);
   void gc_epilogue(bool full);
 
+  // Can concurrent mark process this object immediately, i.e. mark as live without the need
+  // of pushing it on the mark stack (to process references)?
+  // Used to keep objects that are potentially eagerly reclaimed out of the mark stack.
+  // Its klass may still need to be handled.
+  inline bool can_be_marked_through_immediately(oop obj) const;
   // Does the given region fulfill remembered set based eager reclaim candidate requirements?
   bool is_potential_eager_reclaim_candidate(G1HeapRegion* r) const;
 
   inline bool is_humongous_reclaim_candidate(uint region);