--- a/src/hotspot/share/gc/shared/collectedHeap.cpp	Mon Oct 15 09:35:05 2018 -0700
+++ b/src/hotspot/share/gc/shared/collectedHeap.cpp	Wed Oct 10 23:05:15 2018 +0200
@@ -445,6 +445,15 @@
   CollectedHeap::fill_with_object(start, end, zap);
 }
 
+size_t CollectedHeap::min_dummy_object_size() const {
+  return oopDesc::header_size();
+}
+
+size_t CollectedHeap::tlab_alloc_reserve() const {
+  size_t min_size = min_dummy_object_size();
+  return min_size > (size_t)MinObjAlignment ? align_object_size(min_size) : 0;
+}
+
 HeapWord* CollectedHeap::allocate_new_tlab(size_t min_size,
                                            size_t requested_size,
                                            size_t* actual_size) {