--- a/hotspot/src/share/vm/gc/g1/g1PageBasedVirtualSpace.hpp	Thu Sep 15 12:10:43 2016 -0400
+++ b/hotspot/src/share/vm/gc/g1/g1PageBasedVirtualSpace.hpp	Fri Sep 16 11:33:47 2016 +0200
@@ -30,6 +30,8 @@
 #include "memory/virtualspace.hpp"
 #include "utilities/bitMap.hpp"
 
+class WorkGang;
+
 // Virtual space management helper for a virtual space with an OS page allocation
 // granularity.
 // (De-)Allocation requests are always OS page aligned by passing a page index
@@ -117,6 +119,8 @@
   // Uncommit the given area of pages starting at start being size_in_pages large.
   void uncommit(size_t start_page, size_t size_in_pages);
 
+  void pretouch(size_t start_page, size_t size_in_pages, WorkGang* pretouch_gang = NULL);
+
   // Initialize the given reserved space with the given base address and the size
   // actually used.
   // Prefer to commit in page_size chunks.