hg: jdk7/hotspot-gc/hotspot: 6883834: ParNew: assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?") with LargeObjects tests

[y.s.ramakrishna at oracle.com]

Changeset: fc2b798ab316
Author:    ysr
Date:      2011-05-10 00:33 -0700
URL:       http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/fc2b798ab316

6883834: ParNew: assert(!_g->to()->is_in_reserved(obj),"Scanning field twice?") with LargeObjects tests
Summary: Fixed process_chunk_boundaries(), used for parallel card scanning when using ParNew/CMS, so as to prevent double-scanning, or worse, non-scanning of imprecisely marked objects exceeding parallel chunk size. Made some sizing parameters for parallel card scanning diagnostic, disabled ParallelGCRetainPLAB, and elaborated and clarified some comments.
Reviewed-by: stefank, johnc

! src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp
! src/share/vm/gc_implementation/parNew/parOopClosures.inline.hpp
! src/share/vm/memory/cardTableModRefBS.cpp
! src/share/vm/memory/cardTableModRefBS.hpp
! src/share/vm/memory/cardTableRS.cpp
! src/share/vm/memory/cardTableRS.hpp
! src/share/vm/memory/space.cpp
! src/share/vm/runtime/globals.hpp