hg: shenandoah/jdk9/hotspot: Update weak roots using parallel GC threads. Measure time it takes to update weak roots. Don't update strong roots in system dictionary in that pass.

[roman at kennke.org]

Changeset: b894d623038d
Author:    rkennke
Date:      2016-05-06 11:26 +0200
URL:       http://hg.openjdk.java.net/shenandoah/jdk9/hotspot/rev/b894d623038d

Update weak roots using parallel GC threads. Measure time it takes to update weak roots. Don't update strong roots in system dictionary in that pass.

! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.cpp
! src/share/vm/gc/shenandoah/shenandoahCollectorPolicy.hpp
! src/share/vm/gc/shenandoah/shenandoahConcurrentMark.cpp
! src/share/vm/gc/shenandoah/shenandoahRootProcessor.cpp