--- old/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-11-19 11:33:02.929012007 -0800
+++ new/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	2018-11-19 11:33:02.469012026 -0800
@@ -1564,6 +1564,22 @@
   guarantee(_task_queues != NULL, "task_queues allocation failure.");
 }
 
+static size_t actual_reserved_page_size(ReservedSpace rs) {
+  size_t page_size = os::vm_page_size();
+  if (UseLargePages) {
+    // There are two ways to manage large page memory.
+    // 1. OS supports committing large page memory.
+    // 2. OS doesn't support committing large page memory so ReservedSpace manages it.
+    //    And ReservedSpace calls it 'special'. If we failed to set 'special',
+    //    we reserved memory without large page.
+    if (os::can_commit_large_page_memory() || rs.special()) {
+      page_size = os::large_page_size();
+    }
+  }
+
+  return page_size;
+}
+
 G1RegionToSpaceMapper* G1CollectedHeap::create_aux_memory_mapper(const char* description,
                                                                  size_t size,
                                                                  size_t translation_factor) {
@@ -1658,7 +1674,7 @@
 
   // Carve out the G1 part of the heap.
   ReservedSpace g1_rs = heap_rs.first_part(max_byte_size);
-  size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size();
+  size_t page_size = actual_reserved_page_size(heap_rs);
   G1RegionToSpaceMapper* heap_storage =
     G1RegionToSpaceMapper::create_mapper(g1_rs,
                                          g1_rs.size(),