1 /*

     2  * Copyright (c) 2001, 2016, 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  */

    24 

    25 #ifndef SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP

    26 #define SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP

    27 

    28 #include "gc/g1/dirtyCardQueue.hpp"

    29 #include "gc/shared/concurrentGCThread.hpp"

    30 

    31 // Forward Decl.

    32 class CardTableEntryClosure;

    33 class ConcurrentG1Refine;

    34 

    35 // One or more G1 Concurrent Refinement Threads may be active if concurrent

    36 // refinement is in progress.

    37 class ConcurrentG1RefineThread: public ConcurrentGCThread {

    38   friend class VMStructs;

    39   friend class G1CollectedHeap;

    40 

    41   double _vtime_start;  // Initial virtual time.

    42   double _vtime_accum;  // Accumulated virtual time.

    43   uint _worker_id;

    44   uint _worker_id_offset;

    45 

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

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

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

    49   bool _active;

    50   ConcurrentG1RefineThread* _next;

    51   Monitor* _monitor;

    52   ConcurrentG1Refine* _cg1r;

    53 

    54   // This thread's activation/deactivation thresholds

    55   size_t _activation_threshold;

    56   size_t _deactivation_threshold;

    57 

    58   void wait_for_completed_buffers();

    59 

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

    61   bool is_active();

    62   void activate();

    63   void deactivate();

    64 

    65   bool is_primary() { return (_worker_id == 0); }

    66 

    67   void run_service();

    68   void stop_service();

    69 

    70 public:

    71   // Constructor

    72   ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,

    73                            uint worker_id_offset, uint worker_id,

    74                            size_t activate, size_t deactivate);

    75 

    76   void update_thresholds(size_t activate, size_t deactivate);

    77   size_t activation_threshold() const { return _activation_threshold; }

    78 

    79   // Total virtual time so far.

    80   double vtime_accum() { return _vtime_accum; }

    81 

    82   ConcurrentG1Refine* cg1r() { return _cg1r;     }

    83 };

    84 

    85 #endif // SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP