jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp@4dfb2df418f2

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

     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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    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

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

src/share/vm/gc_implementation/g1/concurrentG1RefineThread.hpp@4dfb2df418f2

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