hg: jdk7/hotspot-gc/hotspot: 7011379: G1: overly long concurrent marking cycles

[tony.printezis at oracle.com]

Changeset: 7e37af9d69ef
Author:    tonyp
Date:      2011-01-19 09:35 -0500
URL:       http://hg.openjdk.java.net/jdk7/hotspot-gc/hotspot/rev/7e37af9d69ef

7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr

! src/share/vm/gc_implementation/g1/concurrentMark.cpp
! src/share/vm/gc_implementation/g1/g1CollectedHeap.inline.hpp
! src/share/vm/gc_implementation/g1/g1_globals.hpp
! src/share/vm/gc_implementation/g1/heapRegionSeq.hpp
! src/share/vm/gc_implementation/g1/ptrQueue.cpp
! src/share/vm/gc_implementation/g1/ptrQueue.hpp
! src/share/vm/gc_implementation/g1/satbQueue.cpp
! src/share/vm/gc_implementation/g1/satbQueue.hpp