1 /* 2 * Copyright (c) 2001, 2009, 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 // Forward Decl. 26 class ConcurrentG1Refine; 27 28 // The G1 Concurrent Refinement Thread (could be several in the future). 29 30 class ConcurrentG1RefineThread: public ConcurrentGCThread { 31 friend class VMStructs; 32 friend class G1CollectedHeap; 33 34 double _vtime_start; // Initial virtual time. 35 double _vtime_accum; // Initial virtual time. 36 int _worker_id; 37 int _worker_id_offset; 38 39 // The refinement threads collection is linked list. A predecessor can activate a successor 40 // when the number of the rset update buffer crosses a certain threshold. A successor 41 // would self-deactivate when the number of the buffers falls below the threshold. 42 bool _active; 43 ConcurrentG1RefineThread* _next; 44 Monitor* _monitor; 45 ConcurrentG1Refine* _cg1r; 46 47 int _thread_threshold_step; 48 // This thread activation threshold 49 int _threshold; 50 // This thread deactivation threshold 51 int _deactivation_threshold; 52 53 void sample_young_list_rs_lengths(); 54 void run_young_rs_sampling(); 55 void wait_for_completed_buffers(); 56 57 void set_active(bool x) { _active = x; } 58 bool is_active(); 59 void activate(); 60 void deactivate(); 61 62 // For use by G1CollectedHeap, which is a friend. 63 static SuspendibleThreadSet* sts() { return &_sts; } 64 65 public: 66 virtual void run(); 67 // Constructor 68 ConcurrentG1RefineThread(ConcurrentG1Refine* cg1r, ConcurrentG1RefineThread* next, 69 int worker_id_offset, int worker_id); 70 71 void initialize(); 72 73 // Printing 74 void print() const; 75 void print_on(outputStream* st) const; 76 77 // Total virtual time so far. 78 double vtime_accum() { return _vtime_accum; } 79 80 ConcurrentG1Refine* cg1r() { return _cg1r; } 81 82 // Yield for GC 83 void yield(); 84 // shutdown 85 void stop(); 86 };