--- a/hotspot/src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp	Thu Jan 15 16:05:20 2015 +0100
+++ b/hotspot/src/share/vm/gc_implementation/parallelScavenge/parMarkBitMap.cpp	Fri Jan 16 10:29:12 2015 +0100
@@ -41,7 +41,7 @@
 
   const size_t words = bits / BitsPerWord;
   const size_t raw_bytes = words * sizeof(idx_t);
-  const size_t page_sz = os::page_size_for_region(raw_bytes, 10);
+  const size_t page_sz = os::page_size_for_region_aligned(raw_bytes, 10);
   const size_t granularity = os::vm_allocation_granularity();
   _reserved_byte_size = align_size_up(raw_bytes, MAX2(page_sz, granularity));