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Java example source code file (psCompactionManager.cpp)

This example Java source code file (psCompactionManager.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

could, new_c_heap_array, not, notvalid, null, ooptaskqueueset, parcompactionmanager, parcompactionmanager\:\:copyandupdate, parcompactionmanager\:\:gc_thread_compaction_manager, parcompactionmanager\:\:update, parcompactionmanager\:\:updateandcopy, psparallelcompact\:\:fill_and_update_region, regiontaskqueueset, sanity

The psCompactionManager.cpp Java example source code

/*
 * Copyright (c) 2005, 2013, 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 "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.inline.hpp"
#include "oops/oop.pcgc.inline.hpp"
#include "utilities/stack.inline.hpp"

PSOldGen*            ParCompactionManager::_old_gen = NULL;
ParCompactionManager**  ParCompactionManager::_manager_array = NULL;

RegionTaskQueue**              ParCompactionManager::_region_list = 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;

uint*                 ParCompactionManager::_recycled_stack_index = NULL;
int                   ParCompactionManager::_recycled_top = -1;
int                   ParCompactionManager::_recycled_bottom = -1;

ParCompactionManager::ParCompactionManager() :
    _action(CopyAndUpdate),
    _region_stack(NULL),
    _region_stack_index((uint)max_uintx) {

  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();
}

ParCompactionManager::~ParCompactionManager() {
  delete _recycled_stack_index;
}

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, mtGC);
  guarantee(_manager_array != NULL, "Could not allocate manager_array");

  _region_list = NEW_C_HEAP_ARRAY(RegionTaskQueue*,
                         parallel_gc_threads+1, mtGC);
  guarantee(_region_list != NULL, "Could not initialize promotion manager");

  _recycled_stack_index = NEW_C_HEAP_ARRAY(uint, parallel_gc_threads, mtGC);

  // parallel_gc-threads + 1 to be consistent with the number of
  // compaction managers.
  for(uint i=0; i<parallel_gc_threads + 1; i++) {
    _region_list[i] = new RegionTaskQueue();
    region_list(i)->initialize();
  }

  _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, region_list(i));
  }

  // 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?");
}

int ParCompactionManager::pop_recycled_stack_index() {
  assert(_recycled_bottom <= _recycled_top, "list is empty");
  // Get the next available index
  if (_recycled_bottom < _recycled_top) {
    uint cur, next, last;
    do {
      cur = _recycled_bottom;
      next = cur + 1;
      last = Atomic::cmpxchg(next, &_recycled_bottom, cur);
    } while (cur != last);
    return _recycled_stack_index[next];
  } else {
    return -1;
  }
}

void ParCompactionManager::push_recycled_stack_index(uint v) {
  // Get the next available index
  int cur = Atomic::add(1, &_recycled_top);
  _recycled_stack_index[cur] = v;
  assert(_recycled_bottom <= _recycled_top, "list top and bottom are wrong");
}

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);
}

void ParCompactionManager::region_list_push(uint list_index,
                                            size_t region_index) {
  region_list(list_index)->push(region_index);
}

void ParCompactionManager::verify_region_list_empty(uint list_index) {
  assert(region_list(list_index)->is_empty(), "Not empty");
}

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::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) || _objarray_stack.pop_local(task)) {
      ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass();
      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());
}

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