jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp@8aae2050e83e

7092309: G1: introduce old region set
Summary: Keep track of all the old regions in the heap with a heap region set.
Reviewed-by: brutisso, johnc

     1 /*

     2  * Copyright (c) 2001, 2010, 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

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    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINETHREAD_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINETHREAD_HPP

    28 #include "gc_implementation/shared/concurrentGCThread.hpp"

    30 // Forward Decl.

    31 class ConcurrentG1Refine;

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

    35 class ConcurrentG1RefineThread: public ConcurrentGCThread {

    36   friend class VMStructs;

    37   friend class G1CollectedHeap;

    39   double _vtime_start;  // Initial virtual time.

    40   double _vtime_accum;  // Initial virtual time.

    41   int _worker_id;

    42   int _worker_id_offset;

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

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

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

    47   bool _active;

    48   ConcurrentG1RefineThread* _next;

    49   Monitor* _monitor;

    50   ConcurrentG1Refine* _cg1r;

    52   int _thread_threshold_step;

    53   // This thread activation threshold

    54   int _threshold;

    55   // This thread deactivation threshold

    56   int _deactivation_threshold;

    58   void sample_young_list_rs_lengths();

    59   void run_young_rs_sampling();

    60   void wait_for_completed_buffers();

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

    63   bool is_active();

    64   void activate();

    65   void deactivate();

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

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

    70 public:

    71   virtual void run();

    72   // Constructor

    73   ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next,

    74                            int worker_id_offset, int worker_id);

    76   void initialize();

    78   // Printing

    79   void print() const;

    80   void print_on(outputStream* st) const;

    82   // Total virtual time so far.

    83   double vtime_accum() { return _vtime_accum; }

    85   ConcurrentG1Refine* cg1r() { return _cg1r;     }

    87   // Yield for GC

    88   void yield();

    89   // shutdown

    90   void stop();

    91 };

    93 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINETHREAD_HPP

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