jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSets.hpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.hpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.hpp

Thu, 22 Sep 2011 10:57:37 -0700

author: johnc
date: Thu, 22 Sep 2011 10:57:37 -0700
changeset 3175: 4dfb2df418f2
parent 2974: e8b0b0392037
child 3268: 8aae2050e83e
permissions: -rw-r--r--

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

 /*
  * Copyright (c) 2011, Oracle and/or its affiliates. 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP
 #include "gc_implementation/g1/heapRegionSet.inline.hpp"
 //////////////////// FreeRegionList ////////////////////
 class FreeRegionList : public HeapRegionLinkedList {
 protected:
   virtual const char* verify_region_extra(HeapRegion* hr);
   virtual bool regions_humongous() { return false; }
   virtual bool regions_empty()     { return true;  }
 public:
   FreeRegionList(const char* name) : HeapRegionLinkedList(name) { }
 };
 //////////////////// MasterFreeRegionList ////////////////////
 class MasterFreeRegionList : public FreeRegionList {
 protected:
   virtual const char* verify_region_extra(HeapRegion* hr);
   virtual bool check_mt_safety();
 public:
   MasterFreeRegionList(const char* name) : FreeRegionList(name) { }
 };
 //////////////////// SecondaryFreeRegionList ////////////////////
 class SecondaryFreeRegionList : public FreeRegionList {
 protected:
   virtual bool check_mt_safety();
 public:
   SecondaryFreeRegionList(const char* name) : FreeRegionList(name) { }
 };
 //////////////////// HumongousRegionSet ////////////////////
 class HumongousRegionSet : public HeapRegionSet {
 protected:
   virtual const char* verify_region_extra(HeapRegion* hr);
   virtual bool regions_humongous() { return true;  }
   virtual bool regions_empty()     { return false; }
 public:
   HumongousRegionSet(const char* name) : HeapRegionSet(name) { }
 };
 //////////////////// MasterHumongousRegionSet ////////////////////
 class MasterHumongousRegionSet : public HumongousRegionSet {
 protected:
   virtual bool check_mt_safety();
 public:
   MasterHumongousRegionSet(const char* name) : HumongousRegionSet(name) { }
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/heapRegionSets.hpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSets.hpp