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 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINETHREAD_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINETHREAD_HPP 27 28 #include "gc_implementation/shared/concurrentGCThread.hpp" 29 30 // Forward Decl. 31 class ConcurrentG1Refine; 32 33 // The G1 Concurrent Refinement Thread (could be several in the future). 34 35 class ConcurrentG1RefineThread: public ConcurrentGCThread { 36 friend class VMStructs; 37 friend class G1CollectedHeap; 38 39 double _vtime_start; // Initial virtual time. 40 double _vtime_accum; // Initial virtual time. 41 int _worker_id; 42 int _worker_id_offset; 43 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; 51 52 int _thread_threshold_step; 53 // This thread activation threshold 54 int _threshold; 55 // This thread deactivation threshold 56 int _deactivation_threshold; 57 58 void sample_young_list_rs_lengths(); 59 void run_young_rs_sampling(); 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 // For use by G1CollectedHeap, which is a friend. 68 static SuspendibleThreadSet* sts() { return &_sts; } 69 70 public: 71 virtual void run(); 72 // Constructor 73 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next, 74 int worker_id_offset, int worker_id); 75 76 void initialize(); 77 78 // Printing 79 void print() const; 80 void print_on(outputStream* st) const; 81 82 // Total virtual time so far. 83 double vtime_accum() { return _vtime_accum; } 84 85 ConcurrentG1Refine* cg1r() { return _cg1r; } 86 87 // Yield for GC 88 void yield(); 89 // shutdown 90 void stop(); 91 }; 92 93 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINETHREAD_HPP