| /* |
| * Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "aot/aotLoader.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "code/codeCache.hpp" |
| #include "gc/parallel/cardTableExtension.hpp" |
| #include "gc/parallel/gcTaskManager.hpp" |
| #include "gc/parallel/psMarkSweep.hpp" |
| #include "gc/parallel/psPromotionManager.hpp" |
| #include "gc/parallel/psPromotionManager.inline.hpp" |
| #include "gc/parallel/psScavenge.inline.hpp" |
| #include "gc/parallel/psTasks.hpp" |
| #include "gc/shared/taskqueue.inline.hpp" |
| #include "memory/iterator.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "memory/universe.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/thread.hpp" |
| #include "runtime/vmThread.hpp" |
| #include "services/management.hpp" |
| |
| // |
| // ScavengeRootsTask |
| // |
| |
| void ScavengeRootsTask::do_it(GCTaskManager* manager, uint which) { |
| assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); |
| |
| PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); |
| PSScavengeRootsClosure roots_closure(pm); |
| PSPromoteRootsClosure roots_to_old_closure(pm); |
| |
| switch (_root_type) { |
| case universe: |
| Universe::oops_do(&roots_closure); |
| break; |
| |
| case jni_handles: |
| JNIHandles::oops_do(&roots_closure); |
| break; |
| |
| case threads: |
| { |
| ResourceMark rm; |
| Threads::oops_do(&roots_closure, NULL); |
| } |
| break; |
| |
| case object_synchronizer: |
| ObjectSynchronizer::oops_do(&roots_closure); |
| break; |
| |
| case system_dictionary: |
| SystemDictionary::oops_do(&roots_closure); |
| break; |
| |
| case class_loader_data: |
| { |
| PSScavengeKlassClosure klass_closure(pm); |
| ClassLoaderDataGraph::oops_do(&roots_closure, &klass_closure, false); |
| } |
| break; |
| |
| case management: |
| Management::oops_do(&roots_closure); |
| break; |
| |
| case jvmti: |
| JvmtiExport::oops_do(&roots_closure); |
| break; |
| |
| |
| case code_cache: |
| { |
| MarkingCodeBlobClosure each_scavengable_code_blob(&roots_to_old_closure, CodeBlobToOopClosure::FixRelocations); |
| CodeCache::scavenge_root_nmethods_do(&each_scavengable_code_blob); |
| AOTLoader::oops_do(&roots_closure); |
| } |
| break; |
| |
| default: |
| fatal("Unknown root type"); |
| } |
| |
| // Do the real work |
| pm->drain_stacks(false); |
| } |
| |
| // |
| // ThreadRootsTask |
| // |
| |
| void ThreadRootsTask::do_it(GCTaskManager* manager, uint which) { |
| assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); |
| |
| PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); |
| PSScavengeRootsClosure roots_closure(pm); |
| MarkingCodeBlobClosure roots_in_blobs(&roots_closure, CodeBlobToOopClosure::FixRelocations); |
| |
| if (_java_thread != NULL) |
| _java_thread->oops_do(&roots_closure, &roots_in_blobs); |
| |
| if (_vm_thread != NULL) |
| _vm_thread->oops_do(&roots_closure, &roots_in_blobs); |
| |
| // Do the real work |
| pm->drain_stacks(false); |
| } |
| |
| // |
| // StealTask |
| // |
| |
| StealTask::StealTask(ParallelTaskTerminator* t) : |
| _terminator(t) {} |
| |
| void StealTask::do_it(GCTaskManager* manager, uint which) { |
| assert(ParallelScavengeHeap::heap()->is_gc_active(), "called outside gc"); |
| |
| PSPromotionManager* pm = |
| PSPromotionManager::gc_thread_promotion_manager(which); |
| pm->drain_stacks(true); |
| guarantee(pm->stacks_empty(), |
| "stacks should be empty at this point"); |
| |
| int random_seed = 17; |
| while(true) { |
| StarTask p; |
| if (PSPromotionManager::steal_depth(which, &random_seed, p)) { |
| TASKQUEUE_STATS_ONLY(pm->record_steal(p)); |
| pm->process_popped_location_depth(p); |
| pm->drain_stacks_depth(true); |
| } else { |
| if (terminator()->offer_termination()) { |
| break; |
| } |
| } |
| } |
| guarantee(pm->stacks_empty(), "stacks should be empty at this point"); |
| } |
| |
| // |
| // OldToYoungRootsTask |
| // |
| |
| void OldToYoungRootsTask::do_it(GCTaskManager* manager, uint which) { |
| // There are not old-to-young pointers if the old gen is empty. |
| assert(!_old_gen->object_space()->is_empty(), |
| "Should not be called is there is no work"); |
| assert(_old_gen != NULL, "Sanity"); |
| assert(_old_gen->object_space()->contains(_gen_top) || _gen_top == _old_gen->object_space()->top(), "Sanity"); |
| assert(_stripe_number < ParallelGCThreads, "Sanity"); |
| |
| { |
| PSPromotionManager* pm = PSPromotionManager::gc_thread_promotion_manager(which); |
| CardTableExtension* card_table = |
| barrier_set_cast<CardTableExtension>(ParallelScavengeHeap::heap()->barrier_set()); |
| |
| card_table->scavenge_contents_parallel(_old_gen->start_array(), |
| _old_gen->object_space(), |
| _gen_top, |
| pm, |
| _stripe_number, |
| _stripe_total); |
| |
| // Do the real work |
| pm->drain_stacks(false); |
| } |
| } |