jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp

Thu, 22 Sep 2011 10:57:37 -0700

author: johnc
date: Thu, 22 Sep 2011 10:57:37 -0700
changeset 3175: 4dfb2df418f2
parent 2314: f95d63e2154a
child 3294: bca17e38de00
permissions: -rw-r--r--

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

 /*
  * 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
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 #include "precompiled.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "gc_implementation/parallelScavenge/gcTaskManager.hpp"
 #include "gc_implementation/parallelScavenge/objectStartArray.hpp"
 #include "gc_implementation/parallelScavenge/parMarkBitMap.hpp"
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
 #include "gc_implementation/parallelScavenge/psOldGen.hpp"
 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
 #include "oops/objArrayKlass.inline.hpp"
 #include "oops/oop.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/oop.pcgc.inline.hpp"
 #include "utilities/stack.inline.hpp"
 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();
 }
 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++) {
     assert(manager_array(i)->revisit_klass_stack()->is_empty(), "sanity");
     assert(manager_array(i)->revisit_mdo_stack()->is_empty(), "sanity");
   }
 }
 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());
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/parallelScavenge/psCompactionManager.cpp