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6819061: G1: eliminate serial Other times that are proportional to the collection set length

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6871109: G1: remove the concept of the scan only prefix

Removed scan only regions and associated code. The young portion of the collection set is now constructed incrementally - when a young region is retired as the current allocation region it is added to the collection set.

Reviewed-by: apetrusenko, iveresov, tonyp
This commit is contained in:
John Cuthbertson 2010-04-22 10:02:38 -07:00
parent db6aad1e4e
commit b1867e0dd5
12 changed files with 895 additions and 1013 deletions
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15
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.hpp
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@ -1,5 +1,5 @@
/*
* Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -733,6 +733,19 @@ public:
// to determine whether any heap regions are located above the finger.
void registerCSetRegion(HeapRegion* hr);
// Registers the maximum region-end associated with a set of
// regions with CM. Again this is used to determine whether any
// heap regions are located above the finger.
void register_collection_set_finger(HeapWord* max_finger) {
// max_finger is the highest heap region end of the regions currently
// contained in the collection set. If this value is larger than
// _min_finger then we need to gray objects.
// This routine is like registerCSetRegion but for an entire
// collection of regions.
if (max_finger > _min_finger)
_should_gray_objects = true;
}
// Returns "true" if at least one mark has been completed.
bool at_least_one_mark_complete() { return _at_least_one_mark_complete; }