hg: jdk/sandbox: 8212657: Implementation of JDK-8204089 Promptly Return Unused Committed Memory from G1

[chris.hegarty at oracle.com]

Changeset: f94c7929a44b
Author:    tschatzl
Date:      2018-12-10 10:25 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/f94c7929a44b

8212657: Implementation of JDK-8204089 Promptly Return Unused Committed Memory from G1
Summary: Issue optional, default enabled, concurrent cycles when the VM is idle to reclaim unused internal and Java heap memory.
Reviewed-by: sjohanss, sangheki
Contributed-by: Rodrigo Bruno <rbruno at gsd.inesc-id.pt>, Ruslan Synytsky <rs at jelastic.com>, Thomas Schatzl <thomas.schatzl at oracle.com>

! src/hotspot/share/gc/g1/g1CollectedHeap.cpp
! src/hotspot/share/gc/g1/g1Policy.cpp
! src/hotspot/share/gc/g1/g1YoungRemSetSamplingThread.cpp
! src/hotspot/share/gc/g1/g1YoungRemSetSamplingThread.hpp
! src/hotspot/share/gc/g1/g1_globals.hpp
! src/hotspot/share/gc/shared/gcCause.cpp
! src/hotspot/share/gc/shared/gcCause.hpp
! src/hotspot/share/gc/shared/gcVMOperations.cpp
! src/hotspot/share/logging/logTag.hpp
! test/hotspot/jtreg/TEST.groups
+ test/hotspot/jtreg/gc/g1/TestPeriodicCollection.java