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/shared/concurrentGCThread.hpp" 29 30// Forward Decl. 31class CardTableEntryClosure; 32class ConcurrentG1Refine; 33 34// One or more G1 Concurrent Refinement Threads may be active if concurrent 35// refinement is in progress. 36class ConcurrentG1RefineThread: public ConcurrentGCThread { 37 friend class VMStructs; 38 friend class G1CollectedHeap; 39 40 double _vtime_start; // Initial virtual time. 41 double _vtime_accum; // Accumulated virtual time. 42 uint _worker_id; 43 uint _worker_id_offset; 44 45 // The refinement threads collection is linked list. A predecessor can activate a successor 46 // when the number of the rset update buffer crosses a certain threshold. A successor 47 // would self-deactivate when the number of the buffers falls below the threshold. 48 bool _active; 49 ConcurrentG1RefineThread* _next; 50 Monitor* _monitor; 51 ConcurrentG1Refine* _cg1r; 52 53 // The closure applied to completed log buffers. 54 CardTableEntryClosure* _refine_closure; 55 56 // This thread's activation/deactivation thresholds 57 size_t _activation_threshold; 58 size_t _deactivation_threshold; 59 60 void wait_for_completed_buffers(); 61 62 void set_active(bool x) { _active = x; } 63 bool is_active(); 64 void activate(); 65 void deactivate(); 66 67 bool is_primary() { return (_worker_id == 0); } 68 69 void run_service(); 70 void stop_service(); 71 72public: 73 // Constructor 74 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next, 75 CardTableEntryClosure* refine_closure, 76 uint worker_id_offset, uint worker_id, 77 size_t activate, size_t deactivate); 78 79 void update_thresholds(size_t activate, size_t deactivate); 80 size_t activation_threshold() const { return _activation_threshold; } 81 82 // Total virtual time so far. 83 double vtime_accum() { return _vtime_accum; } 84 85 ConcurrentG1Refine* cg1r() { return _cg1r; } 86}; 87 88#endif // SHARE_VM_GC_G1_CONCURRENTG1REFINETHREAD_HPP 89