1 /* 2 * Copyright (c) 2002, 2011, 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 "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 void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) { 50 assert(Universe::heap()->is_gc_active(), "called outside gc"); 51 52 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 53 PSScavengeRootsClosure roots_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 Threads::oops_do(&roots_closure, NULL); 68 } 69 break; 70 71 case object_synchronizer: 72 ObjectSynchronizer::oops_do(&roots_closure); 73 break; 74 75 case flat_profiler: 76 FlatProfiler::oops_do(&roots_closure); 77 break; 78 79 case system_dictionary: 80 SystemDictionary::oops_do(&roots_closure); 81 break; 82 83 case management: 84 Management::oops_do(&roots_closure); 85 break; 86 87 case jvmti: 88 JvmtiExport::oops_do(&roots_closure); 89 break; 90 91 92 case code_cache: 93 { 94 CodeBlobToOopClosure each_scavengable_code_blob(&roots_closure, /*do_marking=*/ true); 95 CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob); 96 } 97 break; 98 99 default: 100 fatal("Unknown root type"); 101 } 102 103 // Do the real work 104 pm->drain_stacks(false); 105 } 106 107 // 108 // ThreadRootsTask 109 // 110 111 void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) { 112 assert(Universe::heap()->is_gc_active(), "called outside gc"); 113 114 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 115 PSScavengeRootsClosure roots_closure(pm); 116 CodeBlobToOopClosure roots_in_blobs(&roots_closure, /*do_marking=*/ true); 117 118 if (_java_thread != NULL) 119 _java_thread->oops_do(&roots_closure, &roots_in_blobs); 120 121 if (_vm_thread != NULL) 122 _vm_thread->oops_do(&roots_closure, &roots_in_blobs); 123 124 // Do the real work 125 pm->drain_stacks(false); 126 } 127 128 // 129 // StealTask 130 // 131 132 StealTask::StealTask(ParallelTaskTerminator* t) : 133 _terminator(t) {} 134 135 void StealTask::do_it(GCTaskManager* manager, uint which) { 136 assert(Universe::heap()->is_gc_active(), "called outside gc"); 137 138 PSPromotionManager* pm = 139 PSPromotionManager::gc_thread_promotion_manager(which); 140 pm->drain_stacks(true); 141 guarantee(pm->stacks_empty(), 142 "stacks should be empty at this point"); 143 144 int random_seed = 17; 145 while(true) { 146 StarTask p; 147 if (PSPromotionManager::steal_depth(which, &random_seed, p)) { 148 TASKQUEUE_STATS_ONLY(pm->record_steal(p)); 149 pm->process_popped_location_depth(p); 150 pm->drain_stacks_depth(true); 151 } else { 152 if (terminator()->offer_termination()) { 153 break; 154 } 155 } 156 } 157 guarantee(pm->stacks_empty(), "stacks should be empty at this point"); 158 } 159 160 // 161 // SerialOldToYoungRootsTask 162 // 163 164 void SerialOldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { 165 assert(_gen != NULL, "Sanity"); 166 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity"); 167 168 { 169 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 170 171 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); 172 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set(); 173 // FIX ME! Assert that card_table is the type we believe it to be. 174 175 card_table->scavenge_contents(_gen->start_array(), 176 _gen->object_space(), 177 _gen_top, 178 pm); 179 180 // Do the real work 181 pm->drain_stacks(false); 182 } 183 } 184 185 // 186 // OldToYoungRootsTask 187 // 188 189 void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { 190 assert(_gen != NULL, "Sanity"); 191 assert(_gen->object_space()->contains(_gen_top) || _gen_top == _gen->object_space()->top(), "Sanity"); 192 assert(_stripe_number < ParallelGCThreads, "Sanity"); 193 194 { 195 PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); 196 197 assert(Universe::heap()->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); 198 CardTableExtension* card_table = (CardTableExtension *)Universe::heap()->barrier_set(); 199 // FIX ME! Assert that card_table is the type we believe it to be. 200 201 card_table->scavenge_contents_parallel(_gen->start_array(), 202 _gen->object_space(), 203 _gen_top, 204 pm, 205 _stripe_number); 206 207 // Do the real work 208 pm->drain_stacks(false); 209 } 210 }