jdk8-mips64-public/hotspot: src/share/vm/memory/genMarkSweep.hpp@7b0e9cba0307

6896647: card marks can be deferred too long
Summary: Deferred card marks are now flushed during the gc prologue. Parallel[Scavege,OldGC] and SerialGC no longer defer card marks generated by COMPILER2 as a result of ReduceInitialCardMarks. For these cases, introduced a diagnostic option to defer the card marks, only for the purposes of testing and diagnostics. CMS and G1 continue to defer card marks. Potential performance concern related to single-threaded flushing of deferred card marks in the gc prologue will be addressed in the future.
Reviewed-by: never, johnc

     1 /*

     2  * Copyright 2001-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 class GenMarkSweep : public MarkSweep {

    26   friend class VM_MarkSweep;

    27   friend class G1MarkSweep;

    28  public:

    29   static void invoke_at_safepoint(int level, ReferenceProcessor* rp,

    30                                   bool clear_all_softrefs);

    32  private:

    34   // Mark live objects

    35   static void mark_sweep_phase1(int level, bool clear_all_softrefs);

    36   // Calculate new addresses

    37   static void mark_sweep_phase2();

    38   // Update pointers

    39   static void mark_sweep_phase3(int level);

    40   // Move objects to new positions

    41   static void mark_sweep_phase4();

    43   // Temporary data structures for traversal and storing/restoring marks

    44   static void allocate_stacks();

    45   static void deallocate_stacks();

    46 };

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

src/share/vm/memory/genMarkSweep.hpp@7b0e9cba0307

src/share/vm/memory/genMarkSweep.hpp