jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1MarkSweep.hpp@2d160770d2e5

6814437: G1: remove the _new_refs array
Summary: The per-worker _new_refs array is used to hold references that point into the collection set. It is populated during RSet updating and subsequently processed. In the event of an evacuation failure it processed again to recreate the RSets of regions in the collection set. Remove the per-worker _new_refs array by processing the references directly. Use a DirtyCardQueue to hold the cards containing the references so that the RSets of regions in the collection set can be recreated when handling an evacuation failure.
Reviewed-by: iveresov, jmasa, tonyp

     1 /*

     2  * Copyright (c) 2001, 2007, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 class ReferenceProcessor;

    27 // G1MarkSweep takes care of global mark-compact garbage collection for a

    28 // G1CollectedHeap using a four-phase pointer forwarding algorithm.  All

    29 // generations are assumed to support marking; those that can also support

    30 // compaction.

    31 //

    32 // Class unloading will only occur when a full gc is invoked.

    35 class G1MarkSweep : AllStatic {

    36   friend class VM_G1MarkSweep;

    37   friend class Scavenge;

    39  public:

    41   static void invoke_at_safepoint(ReferenceProcessor* rp,

    42                                   bool clear_all_softrefs);

    44  private:

    46   // Mark live objects

    47   static void mark_sweep_phase1(bool& marked_for_deopt,

    48                                 bool clear_all_softrefs);

    49   // Calculate new addresses

    50   static void mark_sweep_phase2();

    51   // Update pointers

    52   static void mark_sweep_phase3();

    53   // Move objects to new positions

    54   static void mark_sweep_phase4();

    56   static void allocate_stacks();

    57 };

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/g1/g1MarkSweep.hpp@2d160770d2e5

src/share/vm/gc_implementation/g1/g1MarkSweep.hpp