1 /* 2 * Copyright (c) 2001, 2017, 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_G1CONCURRENTREFINETHREAD_HPP 26 #define SHARE_VM_GC_G1_G1CONCURRENTREFINETHREAD_HPP 27 28 #include "gc/g1/dirtyCardQueue.hpp" 29 #include "gc/shared/concurrentGCThread.hpp" 30 31 // Forward Decl. 32 class CardTableEntryClosure; 33 class G1ConcurrentRefine; 34 35 // One or more G1 Concurrent Refinement Threads may be active if concurrent 36 // refinement is in progress. 37 class G1ConcurrentRefineThread: 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 G1ConcurrentRefineThread* _next; 51 Monitor* _monitor; 52 G1ConcurrentRefine* _cr; 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 G1ConcurrentRefineThread(G1ConcurrentRefine* cr, G1ConcurrentRefineThread* 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 G1ConcurrentRefine* cr() { return _cr; } 83 }; 84 85 #endif // SHARE_VM_GC_G1_G1CONCURRENTREFINETHREAD_HPP