1 /* 2 * Copyright (c) 2001, 2020, 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_GC_G1_G1CONCURRENTREFINETHREAD_HPP 26 #define SHARE_GC_G1_G1CONCURRENTREFINETHREAD_HPP 27 28 #include "gc/shared/concurrentGCThread.hpp" 29 #include "utilities/ticks.hpp" 30 31 // Forward Decl. 32 class G1ConcurrentRefine; 33 34 // One or more G1 Concurrent Refinement Threads may be active if concurrent 35 // refinement is in progress. 36 class G1ConcurrentRefineThread: 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 43 Tickspan _total_refinement_time; 44 size_t _total_refined_cards; 45 46 uint _worker_id; 47 48 // Each thread has its own semaphore. The i-th thread is responsible for 49 // signaling thread i+1 if the number of buffers in the queue exceeds a 50 // threshold for that thread. Semaphores are also used to wake up the 51 // threads during termination. The 0th (primary) worker is notified by 52 // mutator threads. 53 Semaphore* _notifier; 54 volatile bool _should_notify; 55 bool maybe_deactivate(bool more_work); 56 57 G1ConcurrentRefine* _cr; 58 59 void wait_for_completed_buffers(); 60 61 virtual void run_service(); 62 virtual void stop_service(); 63 64 public: 65 G1ConcurrentRefineThread(G1ConcurrentRefine* cg1r, uint worker_id); 66 67 // Activate this thread. 68 void activate(); 69 70 Tickspan total_refinement_time() const { return _total_refinement_time; } 71 size_t total_refined_cards() const { return _total_refined_cards; } 72 73 // Total virtual time so far. 74 double vtime_accum() { return _vtime_accum; } 75 }; 76 77 #endif // SHARE_GC_G1_G1CONCURRENTREFINETHREAD_HPP