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 #include "runtime/java.hpp" 31 32 ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) : 33 _threads(NULL), _n_threads(0), 34 _hot_card_cache(g1h) 35 { 36 // Ergomonically select initial concurrent refinement parameters 37 if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) { 38 FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1)); 39 } 40 set_green_zone(G1ConcRefinementGreenZone); 41 42 if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) { 43 FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3); 44 } 45 set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone())); 46 47 if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) { 48 FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2); 49 } 50 set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone())); 51 52 _n_worker_threads = thread_num(); 53 // We need one extra thread to do the young gen rset size sampling. 54 _n_threads = _n_worker_threads + 1; 55 56 reset_threshold_step(); 57 58 _threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC); 59 60 uint worker_id_offset = DirtyCardQueueSet::num_par_ids(); 61 62 ConcurrentG1RefineThread *next = NULL; 63 for (uint i = _n_threads - 1; i != UINT_MAX; i--) { 64 ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i); 65 assert(t != NULL, "Conc refine should have been created"); 66 if (t->osthread() == NULL) { 67 vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread"); 68 } 69 70 assert(t->cg1r() == this, "Conc refine thread should refer to this"); 71 _threads[i] = t; 72 next = t; 73 } 74 } 75 76 void ConcurrentG1Refine::reset_threshold_step() { 77 if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) { 78 _thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1); 79 } else { 80 _thread_threshold_step = G1ConcRefinementThresholdStep; 81 } 82 } 83 84 void ConcurrentG1Refine::init() { 85 _hot_card_cache.initialize(); 86 } 87 88 void ConcurrentG1Refine::stop() { 89 if (_threads != NULL) { 90 for (uint i = 0; i < _n_threads; i++) { 91 _threads[i]->stop(); 92 } 93 } 94 } 95 96 void ConcurrentG1Refine::reinitialize_threads() { 97 reset_threshold_step(); 98 if (_threads != NULL) { 99 for (uint i = 0; i < _n_threads; i++) { 100 _threads[i]->initialize(); 101 } 102 } 103 } 104 105 ConcurrentG1Refine::~ConcurrentG1Refine() { 106 if (_threads != NULL) { 107 for (uint i = 0; i < _n_threads; i++) { 108 delete _threads[i]; 109 } 110 FREE_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _threads, mtGC); 111 } 112 } 113 114 void ConcurrentG1Refine::threads_do(ThreadClosure *tc) { 115 if (_threads != NULL) { 116 for (uint i = 0; i < _n_threads; i++) { 117 tc->do_thread(_threads[i]); 118 } 119 } 120 } 121 122 void ConcurrentG1Refine::worker_threads_do(ThreadClosure * tc) { 123 if (_threads != NULL) { 124 for (uint i = 0; i < worker_thread_num(); i++) { 125 tc->do_thread(_threads[i]); 126 } 127 } 128 } 129 130 uint ConcurrentG1Refine::thread_num() { 131 uint n_threads = (G1ConcRefinementThreads > 0) ? G1ConcRefinementThreads 132 : ParallelGCThreads; 133 return MAX2<uint>(n_threads, 1); 134 } 135 136 void ConcurrentG1Refine::print_worker_threads_on(outputStream* st) const { 137 for (uint i = 0; i < _n_threads; ++i) { 138 _threads[i]->print_on(st); 139 st->cr(); 140 } 141 } 142 143 ConcurrentG1RefineThread * ConcurrentG1Refine::sampling_thread() const { 144 return _threads[worker_thread_num()]; 145 }