hg: jdk9/hs/hotspot: 8157952: Parallelize Memory Pretouch

[thomas.schatzl at oracle.com]

Changeset: bc2c975bc342
Author:    tschatzl
Date:      2016-09-16 11:33 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/bc2c975bc342

8157952: Parallelize Memory Pretouch
Summary: Use multiple threads to pretouch memory using -XX:+AlwaysPreTouch to use more memory bandwidth
Reviewed-by: jmasa, sangheki

! src/share/vm/gc/g1/g1CollectedHeap.cpp
! src/share/vm/gc/g1/g1CollectedHeap.hpp
! src/share/vm/gc/g1/g1PageBasedVirtualSpace.cpp
! src/share/vm/gc/g1/g1PageBasedVirtualSpace.hpp
! src/share/vm/gc/g1/g1RegionToSpaceMapper.cpp
! src/share/vm/gc/g1/g1RegionToSpaceMapper.hpp
! src/share/vm/gc/g1/heapRegionManager.cpp
! src/share/vm/gc/g1/heapRegionManager.hpp
! src/share/vm/gc/shared/workgroup.hpp
! src/share/vm/runtime/globals.hpp
! src/share/vm/runtime/os.cpp
! src/share/vm/runtime/os.hpp