duke@435: /*
jcoomes@1993:  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "classfile/systemDictionary.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/objectStartArray.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psOldGen.hpp"
stefank@2314: #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
stefank@2314: #include "oops/objArrayKlass.inline.hpp"
stefank@2314: #include "oops/oop.hpp"
stefank@2314: #include "oops/oop.inline.hpp"
stefank@2314: #include "oops/oop.pcgc.inline.hpp"
stefank@2314: #include "utilities/stack.inline.hpp"
duke@435: 
duke@435: PSOldGen*            ParCompactionManager::_old_gen = NULL;
duke@435: ParCompactionManager**  ParCompactionManager::_manager_array = NULL;
duke@435: OopTaskQueueSet*     ParCompactionManager::_stack_array = NULL;
jcoomes@1746: ParCompactionManager::ObjArrayTaskQueueSet*
jcoomes@1746:   ParCompactionManager::_objarray_queues = NULL;
duke@435: ObjectStartArray*    ParCompactionManager::_start_array = NULL;
duke@435: ParMarkBitMap*       ParCompactionManager::_mark_bitmap = NULL;
jcoomes@1993: RegionTaskQueueSet*  ParCompactionManager::_region_array = NULL;
duke@435: 
duke@435: ParCompactionManager::ParCompactionManager() :
duke@435:     _action(CopyAndUpdate) {
duke@435: 
duke@435:   ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
duke@435:   assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
duke@435: 
duke@435:   _old_gen = heap->old_gen();
duke@435:   _start_array = old_gen()->start_array();
duke@435: 
duke@435:   marking_stack()->initialize();
jcoomes@1993:   _objarray_stack.initialize();
jcoomes@810:   region_stack()->initialize();
duke@435: }
duke@435: 
duke@435: void ParCompactionManager::initialize(ParMarkBitMap* mbm) {
duke@435:   assert(PSParallelCompact::gc_task_manager() != NULL,
duke@435:     "Needed for initialization");
duke@435: 
duke@435:   _mark_bitmap = mbm;
duke@435: 
duke@435:   uint parallel_gc_threads = PSParallelCompact::gc_task_manager()->workers();
duke@435: 
duke@435:   assert(_manager_array == NULL, "Attempt to initialize twice");
duke@435:   _manager_array = NEW_C_HEAP_ARRAY(ParCompactionManager*, parallel_gc_threads+1 );
jcoomes@1746:   guarantee(_manager_array != NULL, "Could not allocate manager_array");
duke@435: 
duke@435:   _stack_array = new OopTaskQueueSet(parallel_gc_threads);
jcoomes@1746:   guarantee(_stack_array != NULL, "Could not allocate stack_array");
jcoomes@1746:   _objarray_queues = new ObjArrayTaskQueueSet(parallel_gc_threads);
jcoomes@1746:   guarantee(_objarray_queues != NULL, "Could not allocate objarray_queues");
jcoomes@810:   _region_array = new RegionTaskQueueSet(parallel_gc_threads);
jcoomes@1746:   guarantee(_region_array != NULL, "Could not allocate region_array");
duke@435: 
duke@435:   // Create and register the ParCompactionManager(s) for the worker threads.
duke@435:   for(uint i=0; i<parallel_gc_threads; i++) {
duke@435:     _manager_array[i] = new ParCompactionManager();
duke@435:     guarantee(_manager_array[i] != NULL, "Could not create ParCompactionManager");
duke@435:     stack_array()->register_queue(i, _manager_array[i]->marking_stack());
jcoomes@1993:     _objarray_queues->register_queue(i, &_manager_array[i]->_objarray_stack);
jcoomes@810:     region_array()->register_queue(i, _manager_array[i]->region_stack());
duke@435:   }
duke@435: 
duke@435:   // The VMThread gets its own ParCompactionManager, which is not available
duke@435:   // for work stealing.
duke@435:   _manager_array[parallel_gc_threads] = new ParCompactionManager();
duke@435:   guarantee(_manager_array[parallel_gc_threads] != NULL,
duke@435:     "Could not create ParCompactionManager");
duke@435:   assert(PSParallelCompact::gc_task_manager()->workers() != 0,
duke@435:     "Not initialized?");
duke@435: }
duke@435: 
duke@435: bool ParCompactionManager::should_update() {
duke@435:   assert(action() != NotValid, "Action is not set");
duke@435:   return (action() == ParCompactionManager::Update) ||
duke@435:          (action() == ParCompactionManager::CopyAndUpdate) ||
duke@435:          (action() == ParCompactionManager::UpdateAndCopy);
duke@435: }
duke@435: 
duke@435: bool ParCompactionManager::should_copy() {
duke@435:   assert(action() != NotValid, "Action is not set");
duke@435:   return (action() == ParCompactionManager::Copy) ||
duke@435:          (action() == ParCompactionManager::CopyAndUpdate) ||
duke@435:          (action() == ParCompactionManager::UpdateAndCopy);
duke@435: }
duke@435: 
duke@435: bool ParCompactionManager::should_verify_only() {
duke@435:   assert(action() != NotValid, "Action is not set");
duke@435:   return action() == ParCompactionManager::VerifyUpdate;
duke@435: }
duke@435: 
duke@435: bool ParCompactionManager::should_reset_only() {
duke@435:   assert(action() != NotValid, "Action is not set");
duke@435:   return action() == ParCompactionManager::ResetObjects;
duke@435: }
duke@435: 
duke@435: ParCompactionManager*
duke@435: ParCompactionManager::gc_thread_compaction_manager(int index) {
duke@435:   assert(index >= 0 && index < (int)ParallelGCThreads, "index out of range");
duke@435:   assert(_manager_array != NULL, "Sanity");
duke@435:   return _manager_array[index];
duke@435: }
duke@435: 
duke@435: void ParCompactionManager::reset() {
jcoomes@2191:   for(uint i = 0; i < ParallelGCThreads + 1; i++) {
jcoomes@2191:     assert(manager_array(i)->revisit_klass_stack()->is_empty(), "sanity");
jcoomes@2191:     assert(manager_array(i)->revisit_mdo_stack()->is_empty(), "sanity");
duke@435:   }
duke@435: }
duke@435: 
jcoomes@1746: void ParCompactionManager::follow_marking_stacks() {
duke@435:   do {
jcoomes@1746:     // Drain the overflow stack first, to allow stealing from the marking stack.
jcoomes@1750:     oop obj;
jcoomes@1993:     while (marking_stack()->pop_overflow(obj)) {
jcoomes@1993:       obj->follow_contents(this);
jcoomes@1746:     }
jcoomes@1746:     while (marking_stack()->pop_local(obj)) {
duke@435:       obj->follow_contents(this);
duke@435:     }
duke@435: 
jcoomes@1750:     // Process ObjArrays one at a time to avoid marking stack bloat.
jcoomes@1746:     ObjArrayTask task;
jcoomes@1993:     if (_objarray_stack.pop_overflow(task)) {
jcoomes@1746:       objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
jcoomes@1746:       k->oop_follow_contents(this, task.obj(), task.index());
jcoomes@1993:     } else if (_objarray_stack.pop_local(task)) {
jcoomes@1746:       objArrayKlass* const k = (objArrayKlass*)task.obj()->blueprint();
jcoomes@1746:       k->oop_follow_contents(this, task.obj(), task.index());
jcoomes@1746:     }
jcoomes@1746:   } while (!marking_stacks_empty());
duke@435: 
jcoomes@1746:   assert(marking_stacks_empty(), "Sanity");
duke@435: }
duke@435: 
jcoomes@810: void ParCompactionManager::drain_region_stacks() {
duke@435:   do {
jcoomes@1993:     // Drain overflow stack first so other threads can steal.
jcoomes@1993:     size_t region_index;
jcoomes@1993:     while (region_stack()->pop_overflow(region_index)) {
jcoomes@810:       PSParallelCompact::fill_and_update_region(this, region_index);
duke@435:     }
duke@435: 
jcoomes@1993:     while (region_stack()->pop_local(region_index)) {
jcoomes@810:       PSParallelCompact::fill_and_update_region(this, region_index);
duke@435:     }
jcoomes@810:   } while (!region_stack()->is_empty());
duke@435: }