1 /* 2 * Copyright (c) 2001, 2013, 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 #include "precompiled.hpp" 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" 27 #include "gc_implementation/g1/concurrentG1RefineThread.hpp" 28 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 29 #include "gc_implementation/g1/g1HotCardCache.hpp" 30 31 ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) : 32 _threads(NULL), _n_threads(0), 33 _hot_card_cache(g1h) 34 { 35 // Ergomonically select initial concurrent refinement parameters 36 if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) { 37 FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1)); 38 } 39 set_green_zone(G1ConcRefinementGreenZone); 40 41 if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) { 42 FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3); 43 } 44 set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone())); 45 46 if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) { 47 FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2); 48 } 49 set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone())); 50 51 _n_worker_threads = thread_num(); 52 // We need one extra thread to do the young gen rset size sampling. 53 _n_threads = _n_worker_threads + 1; 54 55 reset_threshold_step(); 56 57 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC); 58 59 int worker_id_offset = (int)DirtyCardQueueSet::num_par_ids(); 60 61 ConcurrentG1RefineThread *next = NULL; 62 for (int i = _n_threads - 1; i >= 0; i--) { 63 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i); 64 assert(t != NULL, "Conc refine should have been created"); 65 assert(t->cg1r() == this, "Conc refine thread should refer to this"); 66 _threads[i] = t; 67 next = t; 68 } 69 } 70 71 void ConcurrentG1Refine::reset_threshold_step() { 72 if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) { 73 _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1); 74 } else { 75 _thread_threshold_step = G1ConcRefinementThresholdStep; 76 } 77 } 78 79 void ConcurrentG1Refine::init() { 80 _hot_card_cache.initialize(); 81 } 82 83 void ConcurrentG1Refine::stop() { 84 if (_threads != NULL) { 85 for (int i = 0; i < _n_threads; i++) { 86 _threads[i]->stop(); 87 } 88 } 89 } 90 91 void ConcurrentG1Refine::reinitialize_threads() { 92 reset_threshold_step(); 93 if (_threads != NULL) { 94 for (int i = 0; i < _n_threads; i++) { 95 _threads[i]->initialize(); 96 } 97 } 98 } 99 100 ConcurrentG1Refine::~ConcurrentG1Refine() { 101 if (_threads != NULL) { 102 for (int i = 0; i < _n_threads; i++) { 103 delete _threads[i]; 104 } 105 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC); 106 } 107 } 108 109 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) { 110 if (_threads != NULL) { 111 for (int i = 0; i < _n_threads; i++) { 112 tc->do_thread(_threads[i]); 113 } 114 } 115 } 116 117 void ConcurrentG1Refine::worker_threads_do(ThreadClosure * tc) { 118 if (_threads != NULL) { 119 for (int i = 0; i < worker_thread_num(); i++) { 120 tc->do_thread(_threads[i]); 121 } 122 } 123 } 124 125 int ConcurrentG1Refine::thread_num() { 126 int n_threads = (G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads 127 : ParallelGCThreads; 128 return MAX2<int>(n_threads, 1); 129 } 130 131 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const { 132 for (int i = 0; i < _n_threads; ++i) { 133 _threads[i]->print_on(st); 134 st->cr(); 135 } 136 } 137 138 ConcurrentG1RefineThread * ConcurrentG1Refine::sampling_thread() const { 139 return _threads[worker_thread_num()]; 140 }