| /* |
| * Copyright (c) 2005, 2010, 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 "incls/_precompiled.incl" |
| #include "incls/_psCompactionManager.cpp.incl" |
| |
| PSOldGen* ParCompactionManager::_old_gen = NULL; |
| ParCompactionManager** ParCompactionManager::_manager_array = NULL; |
| OopTaskQueueSet* ParCompactionManager::_stack_array = NULL; |
| ParCompactionManager::ObjArrayTaskQueueSet* |
| ParCompactionManager::_objarray_queues = NULL; |
| ObjectStartArray* ParCompactionManager::_start_array = NULL; |
| ParMarkBitMap* ParCompactionManager::_mark_bitmap = NULL; |
| RegionTaskQueueSet* ParCompactionManager::_region_array = NULL; |
| |
| ParCompactionManager::ParCompactionManager() : |
| _action(CopyAndUpdate) { |
| |
| ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
| assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity"); |
| |
| _old_gen = heap->old_gen(); |
| _start_array = old_gen()->start_array(); |
| |
| marking_stack()->initialize(); |
| _objarray_stack.initialize(); |
| region_stack()->initialize(); |
| |
| // Note that _revisit_klass_stack is allocated out of the |
| // C heap (as opposed to out of ResourceArena). |
| int size = |
| (SystemDictionary::number_of_classes() * 2) * 2 / ParallelGCThreads; |
| _revisit_klass_stack = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true); |
| // From some experiments (#klass/k)^2 for k = 10 seems a better fit, but this will |
| // have to do for now until we are able to investigate a more optimal setting. |
| _revisit_mdo_stack = new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true); |
| } |
| |
| ParCompactionManager::~ParCompactionManager() { |
| delete _revisit_klass_stack; |
| delete _revisit_mdo_stack; |
| // _manager_array and _stack_array are statics |
| // shared with all instances of ParCompactionManager |
| // should not be deallocated. |
| } |
| |
| void ParCompactionManager::initialize(ParMarkBitMap* mbm) { |
| assert(PSParallelCompact::gc_task_manager() != NULL, |
| "Needed for initialization"); |
| |
| _mark_bitmap = mbm; |
| |
| uint parallel_gc_threads = PSParallelCompact::gc_task_manager()->workers(); |
| |
| assert(_manager_array == NULL, "Attempt to initialize twice"); |
| _manager_array = NEW_C_HEAP_ARRAY(ParCompactionManager*, parallel_gc_threads+1 ); |
| guarantee(_manager_array != NULL, "Could not allocate manager_array"); |
| |
| _stack_array = new OopTaskQueueSet(parallel_gc_threads); |
| guarantee(_stack_array != NULL, "Could not allocate stack_array"); |
| _objarray_queues = new ObjArrayTaskQueueSet(parallel_gc_threads); |
| guarantee(_objarray_queues != NULL, "Could not allocate objarray_queues"); |
| _region_array = new RegionTaskQueueSet(parallel_gc_threads); |
| guarantee(_region_array != NULL, "Could not allocate region_array"); |
| |
| // Create and register the ParCompactionManager(s) for the worker threads. |
| for(uint i=0; i<parallel_gc_threads; i++) { |
| _manager_array[i] = new ParCompactionManager(); |
| guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager"); |
| stack_array()->register_queue(i, _manager_array[i]->marking_stack()); |
| _objarray_queues->register_queue(i, &_manager_array[i]->_objarray_stack); |
| region_array()->register_queue(i, _manager_array[i]->region_stack()); |
| } |
| |
| // The VMThread gets its own ParCompactionManager, which is not available |
| // for work stealing. |
| _manager_array[parallel_gc_threads] = new ParCompactionManager(); |
| guarantee(_manager_array[parallel_gc_threads] != NULL, |
| "Could not create ParCompactionManager"); |
| assert(PSParallelCompact::gc_task_manager()->workers() != 0, |
| "Not initialized?"); |
| } |
| |
| bool ParCompactionManager::should_update() { |
| assert(action() != NotValid, "Action is not set"); |
| return (action() == ParCompactionManager::Update) || |
| (action() == ParCompactionManager::CopyAndUpdate) || |
| (action() == ParCompactionManager::UpdateAndCopy); |
| } |
| |
| bool ParCompactionManager::should_copy() { |
| assert(action() != NotValid, "Action is not set"); |
| return (action() == ParCompactionManager::Copy) || |
| (action() == ParCompactionManager::CopyAndUpdate) || |
| (action() == ParCompactionManager::UpdateAndCopy); |
| } |
| |
| bool ParCompactionManager::should_verify_only() { |
| assert(action() != NotValid, "Action is not set"); |
| return action() == ParCompactionManager::VerifyUpdate; |
| } |
| |
| bool ParCompactionManager::should_reset_only() { |
| assert(action() != NotValid, "Action is not set"); |
| return action() == ParCompactionManager::ResetObjects; |
| } |
| |
| ParCompactionManager* |
| ParCompactionManager::gc_thread_compaction_manager(int index) { |
| assert(index >= 0 && index < (int)ParallelGCThreads, "index out of range"); |
| assert(_manager_array != NULL, "Sanity"); |
| return _manager_array[index]; |
| } |
| |
| void ParCompactionManager::reset() { |
| for(uint i=0; i<ParallelGCThreads+1; i++) { |
| manager_array(i)->revisit_klass_stack()->clear(); |
| manager_array(i)->revisit_mdo_stack()->clear(); |
| } |
| } |
| |
| void ParCompactionManager::follow_marking_stacks() { |
| do { |
| // Drain the overflow stack first, to allow stealing from the marking stack. |
| oop obj; |
| while (marking_stack()->pop_overflow(obj)) { |
| obj->follow_contents(this); |
| } |
| while (marking_stack()->pop_local(obj)) { |
| obj->follow_contents(this); |
| } |
| |
| // Process ObjArrays one at a time to avoid marking stack bloat. |
| ObjArrayTask task; |
| if (_objarray_stack.pop_overflow(task)) { |
| objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint(); |
| k->oop_follow_contents(this, task.obj(), task.index()); |
| } else if (_objarray_stack.pop_local(task)) { |
| objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint(); |
| k->oop_follow_contents(this, task.obj(), task.index()); |
| } |
| } while (!marking_stacks_empty()); |
| |
| assert(marking_stacks_empty(), "Sanity"); |
| } |
| |
| void ParCompactionManager::drain_region_stacks() { |
| do { |
| // Drain overflow stack first so other threads can steal. |
| size_t region_index; |
| while (region_stack()->pop_overflow(region_index)) { |
| PSParallelCompact::fill_and_update_region(this, region_index); |
| } |
| |
| while (region_stack()->pop_local(region_index)) { |
| PSParallelCompact::fill_and_update_region(this, region_index); |
| } |
| } while (!region_stack()->is_empty()); |
| } |
| |
| #ifdef ASSERT |
| bool ParCompactionManager::stacks_have_been_allocated() { |
| return (revisit_klass_stack()->data_addr() != NULL && |
| revisit_mdo_stack()->data_addr() != NULL); |
| } |
| #endif |