1 /* 2 * Copyright (c) 2002, 2015, 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 "classfile/systemDictionary.hpp" 27 #include "code/codeCache.hpp" 28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" 29 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp" 30 #include "gc_implementation/parallelScavenge/psMarkSweep.hpp" 31 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" 32 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" 33 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" 34 #include "gc_implementation/parallelScavenge/psTasks.hpp" 35 #include "memory/iterator.hpp" 36 #include "memory/universe.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "runtime/fprofiler.hpp" 39 #include "runtime/thread.hpp" 40 #include "runtime/vmThread.hpp" 41 #include "services/management.hpp" 42 #include "utilities/taskqueue.inline.hpp" 43 44 // 45 // ScavengeRootsTask 46 // 47 48 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) { 49 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 50 51 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 52 PSScavengeRootsClosure roots_closure(pm); 53 PSPromoteRootsClosure roots_to_old_closure(pm); 54 55 switch (_root_type) { 56 case universe: 57 Universe::oops_do(&roots_closure); 58 break; 59 60 case jni_handles: 61 JNIHandles::oops_do(&roots_closure); 62 break; 63 64 case threads: 65 { 66 ResourceMark rm; 67 CLDClosure* cld_closure = NULL; // Not needed. All CLDs are already visited. 68 Threads::oops_do(&roots_closure, cld_closure, NULL); 69 } 70 break; 71 72 case object_synchronizer: 73 ObjectSynchronizer::oops_do(&roots_closure); 74 break; 75 76 case flat_profiler: 77 FlatProfiler::oops_do(&roots_closure); 78 break; 79 80 case system_dictionary: 81 SystemDictionary::oops_do(&roots_closure); 82 break; 83 84 case class_loader_data: 85 { 86 PSScavengeKlassClosure klass_closure(pm); 87 ClassLoaderDataGraph::oops_do(&roots_closure, &klass_closure, false); 88 } 89 break; 90 91 case management: 92 Management::oops_do(&roots_closure); 93 break; 94 95 case jvmti: 96 JvmtiExport::oops_do(&roots_closure); 97 break; 98 99 100 case code_cache: 101 { 102 MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations); 103 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob); 104 } 105 break; 106 107 default: 108 fatal("Unknown root type"); 109 } 110 111 // Do the real work 112 pm->drain_stacks(false); 113 } 114 115 // 116 // ThreadRootsTask 117 // 118 119 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) { 120 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 121 122 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 123 PSScavengeRootsClosure roots_closure(pm); 124 CLDClosure* roots_from_clds = NULL; // Not needed. All CLDs are already visited. 125 MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations); 126 127 if (_java_thread != NULL) 128 _java_thread->oops_do(&roots_closure, roots_from_clds, &roots_in_blobs); 129 130 if (_vm_thread != NULL) 131 _vm_thread->oops_do(&roots_closure, roots_from_clds, &roots_in_blobs); 132 133 // Do the real work 134 pm->drain_stacks(false); 135 } 136 137 // 138 // StealTask 139 // 140 141 StealTask::StealTask(ParallelTaskTerminator* t) : 142 _terminator(t) {} 143 144 void StealTask::do_it(GCTaskManager* manager, uint which) { 145 assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); 146 147 PSPromotionManager* pm = 148 PSPromotionManager::gc_thread_promotion_manager(which); 149 pm->drain_stacks(true); 150 guarantee(pm->stacks_empty(), 151 "stacks should be empty at this point"); 152 153 int random_seed = 17; 154 while(true) { 155 StarTask p; 156 if (PSPromotionManager::steal_depth(which, &random_seed, p)) { 157 TASKQUEUE_STATS_ONLY(pm->record_steal(p)); 158 pm->process_popped_location_depth(p); 159 pm->drain_stacks_depth(true); 160 } else { 161 if (terminator()->offer_termination()) { 162 break; 163 } 164 } 165 } 166 guarantee(pm->stacks_empty(), "stacks should be empty at this point"); 167 } 168 169 // 170 // OldToYoungRootsTask 171 // 172 173 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { 174 // There are not old-to-young pointers if the old gen is empty. 175 assert(!_gen->object_space()->is_empty(), 176 "Should not be called is there is no work"); 177 assert(_gen != NULL, "Sanity"); 178 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity"); 179 assert(_stripe_number < ParallelGCThreads, "Sanity"); 180 181 { 182 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 183 CardTableExtension* card_table = 184 barrier_set_cast<CardTableExtension>(ParallelScavengeHeap::heap()->barrier_set()); 185 186 card_table->scavenge_contents_parallel(_gen->start_array(), 187 _gen->object_space(), 188 _gen_top, 189 pm, 190 _stripe_number, 191 _stripe_total); 192 193 // Do the real work 194 pm->drain_stacks(false); 195 } 196 }