--- old/src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp	2019-03-08 16:22:49.171524565 +0100
+++ new/src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp	2019-03-08 16:22:48.903525935 +0100
@@ -242,6 +242,7 @@
 //
 private:
   MemRegion _heap_region;
+  bool      _heap_region_special;
   size_t    _num_regions;
   ShenandoahHeapRegion** _regions;
   ShenandoahRegionIterator _update_refs_iterator;
@@ -257,6 +258,10 @@
   void heap_region_iterate(ShenandoahHeapRegionClosure* blk) const;
   void parallel_heap_region_iterate(ShenandoahHeapRegionClosure* blk) const;
 
+  // Support for region uncommits
+  void commit_region(ShenandoahHeapRegion *r);
+  void uncommit_region(ShenandoahHeapRegion *r);
+
 // ---------- GC state machinery
 //
 // GC state describes the important parts of collector state, that may be
@@ -649,6 +654,9 @@
   size_t _bitmap_regions_per_slice;
   size_t _bitmap_bytes_per_slice;
 
+  bool _bitmap_region_special;
+  bool _aux_bitmap_region_special;
+
   // Used for buffering per-region liveness data.
   // Needed since ShenandoahHeapRegion uses atomics to update liveness.
   //