view src/share/vm/gc_implementation/g1/g1MarkSweep.hpp @ 2034:7e37af9d69ef

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
author tonyp
date Wed, 19 Jan 2011 09:35:17 -0500
parents c18cbe5936b8
children f2110083203d
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/*
 * Copyright (c) 2001, 2010, 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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 * questions.
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 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP

#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
#include "gc_implementation/g1/heapRegion.hpp"
#include "memory/genMarkSweep.hpp"
#include "memory/generation.hpp"
#include "memory/universe.hpp"
#include "oops/markOop.hpp"
#include "oops/oop.hpp"
#include "runtime/timer.hpp"
#include "utilities/growableArray.hpp"

class ReferenceProcessor;

// G1MarkSweep takes care of global mark-compact garbage collection for a
// G1CollectedHeap using a four-phase pointer forwarding algorithm.  All
// generations are assumed to support marking; those that can also support
// compaction.
//
// Class unloading will only occur when a full gc is invoked.


class G1MarkSweep : AllStatic {
  friend class VM_G1MarkSweep;
  friend class Scavenge;

 public:

  static void invoke_at_safepoint(ReferenceProcessor* rp,
                                  bool clear_all_softrefs);

 private:

  // Mark live objects
  static void mark_sweep_phase1(bool& marked_for_deopt,
                                bool clear_all_softrefs);
  // Calculate new addresses
  static void mark_sweep_phase2();
  // Update pointers
  static void mark_sweep_phase3();
  // Move objects to new positions
  static void mark_sweep_phase4();

  static void allocate_stacks();
};

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP