--- old/src/hotspot/share/memory/universe.cpp	2018-09-19 15:53:59.144512300 -0700
+++ new/src/hotspot/share/memory/universe.cpp	2018-09-19 15:53:58.476689000 -0700
@@ -812,6 +812,10 @@
       || UseParallelGC
       || use_large_pages, "Wrong alignment to use large pages");
 
+  // When AllocateOldGenAt is set, we cannot use largepages for entire heap memory.
+  // Only young gen which is allocated in dram can use large pages, but we currently don't support that.
+  use_large_pages = (AllocateOldGenAt != NULL) ? false : use_large_pages;
+
   // Now create the space.
   ReservedHeapSpace total_rs(total_reserved, alignment, use_large_pages, AllocateHeapAt);