hg: jdk9/hs/hotspot: 8155917: Memory access in free regions during G1 full gc causes regressions in SPECjvm2008 scimark.fft, lu, sor, sparse with 9+116 on Linux-x64

[thomas.schatzl at oracle.com]

Changeset: b9a861dc8f9d
Author:    tschatzl
Date:      2016-08-30 09:17 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/b9a861dc8f9d

8155917: Memory access in free regions during G1 full gc causes regressions in SPECjvm2008 scimark.fft,lu,sor,sparse with 9+116 on Linux-x64
Summary: Do not unnecessarily touch the memory of free regions during the compaction phase in G1 full gc causing some OSes to allocate physical memory for them, decreasing performance in some situations.
Reviewed-by: mgerdin, jmasa

! src/share/vm/gc/shared/space.inline.hpp