1 /* 2 * Copyright (c) 2002, 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 #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.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 "oops/oop.psgc.inline.hpp" 39 #include "runtime/fprofiler.hpp" 40 #include "runtime/thread.hpp" 41 #include "runtime/vmThread.hpp" 42 #include "services/management.hpp" 43 #include "utilities/taskqueue.hpp" 44 45 // 46 // ScavengeRootsTask 47 // 48 49 // Define before use 50 class PSScavengeRootsClosure: public OopClosure { 51 private: 52 PSPromotionManager* _promotion_manager; 53 54 protected: 55 template <class T> void do_oop_work(T *p) { 56 if (PSScavenge::should_scavenge(p)) { 57 // We never card mark roots, maybe call a func without test? 58 PSScavenge::copy_and_push_safe_barrier(_promotion_manager, p); 59 } 60 } 61 public: 62 PSScavengeRootsClosure(PSPromotionManager* pm) : _promotion_manager(pm) { } 63 void do_oop(oop* p) { PSScavengeRootsClosure::do_oop_work(p); } 64 void do_oop(narrowOop* p) { PSScavengeRootsClosure::do_oop_work(p); } 65 }; 66 67 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) { 68 assert(Universe::heap()->is_gc_active(), "called outside gc"); 69 70 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 71 PSScavengeRootsClosure roots_closure(pm); 72 73 switch (_root_type) { 74 case universe: 75 Universe::oops_do(&roots_closure); 76 ReferenceProcessor::oops_do(&roots_closure); 77 break; 78 79 case jni_handles: 80 JNIHandles::oops_do(&roots_closure); 81 break; 82 83 case threads: 84 { 85 ResourceMark rm; 86 Threads::oops_do(&roots_closure, NULL); 87 } 88 break; 89 90 case object_synchronizer: 91 ObjectSynchronizer::oops_do(&roots_closure); 92 break; 93 94 case flat_profiler: 95 FlatProfiler::oops_do(&roots_closure); 96 break; 97 98 case system_dictionary: 99 SystemDictionary::oops_do(&roots_closure); 100 break; 101 102 case management: 103 Management::oops_do(&roots_closure); 104 break; 105 106 case jvmti: 107 JvmtiExport::oops_do(&roots_closure); 108 break; 109 110 111 case code_cache: 112 { 113 CodeBlobToOopClosure each_scavengable_code_blob(&roots_closure, /*do_marking=*/ true); 114 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob); 115 } 116 break; 117 118 default: 119 fatal("Unknown root type"); 120 } 121 122 // Do the real work 123 pm->drain_stacks(false); 124 } 125 126 // 127 // ThreadRootsTask 128 // 129 130 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) { 131 assert(Universe::heap()->is_gc_active(), "called outside gc"); 132 133 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 134 PSScavengeRootsClosure roots_closure(pm); 135 CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true); 136 137 if (_java_thread != NULL) 138 _java_thread->oops_do(&roots_closure, &roots_in_blobs); 139 140 if (_vm_thread != NULL) 141 _vm_thread->oops_do(&roots_closure, &roots_in_blobs); 142 143 // Do the real work 144 pm->drain_stacks(false); 145 } 146 147 // 148 // StealTask 149 // 150 151 StealTask::StealTask(ParallelTaskTerminator* t) : 152 _terminator(t) {} 153 154 void StealTask::do_it(GCTaskManager* manager, uint which) { 155 assert(Universe::heap()->is_gc_active(), "called outside gc"); 156 157 PSPromotionManager* pm = 158 PSPromotionManager::gc_thread_promotion_manager(which); 159 pm->drain_stacks(true); 160 guarantee(pm->stacks_empty(), 161 "stacks should be empty at this point"); 162 163 int random_seed = 17; 164 while(true) { 165 StarTask p; 166 if (PSPromotionManager::steal_depth(which, &random_seed, p)) { 167 TASKQUEUE_STATS_ONLY(pm->record_steal(p)); 168 pm->process_popped_location_depth(p); 169 pm->drain_stacks_depth(true); 170 } else { 171 if (terminator()->offer_termination()) { 172 break; 173 } 174 } 175 } 176 guarantee(pm->stacks_empty(), "stacks should be empty at this point"); 177 } 178 179 // 180 // SerialOldToYoungRootsTask 181 // 182 183 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { 184 assert(_gen != NULL, "Sanity"); 185 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity"); 186 187 { 188 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 189 190 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); 191 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set(); 192 // FIX ME! Assert that card_table is the type we believe it to be. 193 194 card_table->scavenge_contents(_gen->start_array(), 195 _gen->object_space(), 196 _gen_top, 197 pm); 198 199 // Do the real work 200 pm->drain_stacks(false); 201 } 202 } 203 204 // 205 // OldToYoungRootsTask 206 // 207 208 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { 209 assert(_gen != NULL, "Sanity"); 210 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity"); 211 assert(_stripe_number < ParallelGCThreads, "Sanity"); 212 213 { 214 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 215 216 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); 217 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set(); 218 // FIX ME! Assert that card_table is the type we believe it to be. 219 220 card_table->scavenge_contents_parallel(_gen->start_array(), 221 _gen->object_space(), 222 _gen_top, 223 pm, 224 _stripe_number); 225 226 // Do the real work 227 pm->drain_stacks(false); 228 } 229 }