Merge

8055635: Missing include in g1RegionToSpaceMapper.hpp results in unresolved symbol of fastdebug build without precompiled headers Reviewed-by: mgerdin, ehelin

8055525: Bigapp weblogic+medrec fails to startup after JDK-8038423 Summary: If large pages are enabled and configured in Linux, the VM always pre-commits the entire space. The VM fails verification of the commit of the initial heap because some internal data structure marked all memory pages of the heap as committed during initialization. This makes the code think that we attempted a double-commit during first allocation of the heap. Remove the initial marking of memory pages of the heap to committed. Reviewed-by: mgerdin

Merge

8038423: G1: Decommit memory within heap Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps. Reviewed-by: mgerdin, brutisso, jwilhelm

8044406: JVM crash with JDK8 (build 1.8.0-b132) with G1 GC Summary: Fill the last card that has been allocated into with a dummy object Reviewed-by: tschatzl, mgerdin

Merge

8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data Summary: Let HeapRegionSeq manage the heap region and auxiliary data to decrease the amount of responsibilities of G1CollectedHeap, and encapsulate this work from other code. Reviewed-by: jwilhelm, jmasa, mgerdin, brutisso

Merge

8055284: sanity/WhiteBox.java fails with NPE Summary: Revert previous change, sanity/WhiteBox.java provides its own sun.hotspot.WhiteBox class. Reviewed-by: ehelin, brutisso Contributed-by: dmitry.fazunenko@oracle.com