jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1RefineThread.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, 2009, 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 // Forward Decl.

    26 class ConcurrentG1Refine;

    28 // The G1 Concurrent Refinement Thread (could be several in the future).

    30 class ConcurrentG1RefineThread: public ConcurrentGCThread {

    31   friend class VMStructs;

    32   friend class G1CollectedHeap;

    34   double _vtime_start;  // Initial virtual time.

    35   double _vtime_accum;  // Initial virtual time.

    36   int _worker_id;

    37   int _worker_id_offset;

    39   // The refinement threads collection is linked list. A predecessor can activate a successor

    40   // when the number of the rset update buffer crosses a certain threshold. A successor

    41   // would self-deactivate when the number of the buffers falls below the threshold.

    42   bool _active;

    43   ConcurrentG1RefineThread* _next;

    44   Monitor* _monitor;

    45   ConcurrentG1Refine* _cg1r;

    47   int _thread_threshold_step;

    48   // This thread activation threshold

    49   int _threshold;

    50   // This thread deactivation threshold

    51   int _deactivation_threshold;

    53   void sample_young_list_rs_lengths();

    54   void run_young_rs_sampling();

    55   void wait_for_completed_buffers();

    57   void set_active(bool x) { _active = x; }

    58   bool is_active();

    59   void activate();

    60   void deactivate();

    62   // For use by G1CollectedHeap, which is a friend.

    63   static SuspendibleThreadSet* sts() { return &_sts; }

    65 public:

    66   virtual void run();

    67   // Constructor

    68   ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,

    69                            int worker_id_offset, int worker_id);

    71   void initialize();

    73   // Printing

    74   void print() const;

    75   void print_on(outputStream* st) const;

    77   // Total virtual time so far.

    78   double vtime_accum() { return _vtime_accum; }

    80   ConcurrentG1Refine* cg1r() { return _cg1r;     }

    82   // Yield for GC

    83   void yield();

    84   // shutdown

    85   void stop();

    86 };

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

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp@2d160770d2e5

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp