| /* |
| * This file is part of the Jikes RVM project (http://jikesrvm.org). |
| * |
| * This file is licensed to You under the Eclipse Public License (EPL); |
| * You may not use this file except in compliance with the License. You |
| * may obtain a copy of the License at |
| * |
| * http://www.opensource.org/licenses/eclipse-1.0.php |
| * |
| * See the COPYRIGHT.txt file distributed with this work for information |
| * regarding copyright ownership. |
| */ |
| package org.mmtk.plan.stickyimmix; |
| |
| import org.mmtk.plan.*; |
| import org.mmtk.plan.immix.Immix; |
| import org.mmtk.plan.immix.ImmixCollector; |
| import org.mmtk.plan.immix.ImmixDefragTraceLocal; |
| import org.mmtk.plan.immix.ImmixTraceLocal; |
| import org.mmtk.policy.immix.CollectorLocal; |
| import org.mmtk.utility.alloc.ImmixAllocator; |
| import org.mmtk.utility.deque.ObjectReferenceDeque; |
| import org.mmtk.vm.VM; |
| |
| import org.vmmagic.pragma.*; |
| |
| /** |
| * This class implements <i>per-collector thread</i> behavior |
| * and state for the <i>StickMS</i> plan, which implements a generational |
| * sticky mark bits immix collector.<p> |
| * |
| * Specifically, this class defines <i>StickyMS</i> collection behavior |
| * (through <code>trace</code> and the <code>collectionPhase</code> |
| * method).<p> |
| * |
| * @see StickyImmix for an overview of the algorithm.<p> |
| * @see StickyImmixMutator |
| * @see StopTheWorldCollector |
| * @see CollectorContext |
| * @see Phase |
| */ |
| @Uninterruptible |
| public class StickyImmixCollector extends ImmixCollector { |
| |
| /**************************************************************************** |
| * Instance fields |
| */ |
| private StickyImmixNurseryTraceLocal nurseryTrace; |
| private final ImmixAllocator nurseryCopy; |
| |
| /**************************************************************************** |
| * Initialization |
| */ |
| |
| /** |
| * Constructor |
| */ |
| public StickyImmixCollector() { |
| ObjectReferenceDeque modBuffer = new ObjectReferenceDeque("mod buffer", global().modPool); |
| fastTrace = new ImmixTraceLocal(global().immixTrace, modBuffer); |
| defragTrace = new ImmixDefragTraceLocal(global().immixTrace, modBuffer); |
| nurseryTrace = new StickyImmixNurseryTraceLocal(global().immixTrace, modBuffer); |
| immix = new CollectorLocal(StickyImmix.immixSpace); |
| nurseryCopy = new ImmixAllocator(Immix.immixSpace, true, true); |
| } |
| |
| /**************************************************************************** |
| * |
| * Collection |
| */ |
| |
| /** |
| * Perform a per-collector collection phase. |
| * |
| * @param phaseId The collection phase to perform |
| * @param primary Perform any single-threaded activities using this thread. |
| */ |
| @Inline |
| public final void collectionPhase(short phaseId, boolean primary) { |
| boolean collectWholeHeap = global().collectWholeHeap; |
| |
| if (phaseId == StickyImmix.PREPARE) { |
| global().modPool.prepareNonBlocking(); /* always do this */ |
| } |
| |
| if (!collectWholeHeap) { |
| if (phaseId == StickyImmix.PREPARE) { |
| currentTrace = (TraceLocal) nurseryTrace; |
| immix.prepare(false); |
| nurseryTrace.prepare(); |
| nurseryCopy.reset(); |
| copy.reset(); |
| return; |
| } |
| |
| if (phaseId == StickyImmix.ROOTS) { |
| VM.scanning.computeStaticRoots(currentTrace); |
| VM.scanning.computeGlobalRoots(currentTrace); |
| return; |
| } |
| |
| if (phaseId == StickyImmix.CLOSURE) { |
| nurseryTrace.completeTrace(); |
| return; |
| } |
| |
| if (phaseId == StickyImmix.RELEASE) { |
| nurseryTrace.release(); |
| immix.release(false); |
| global().modPool.reset(); |
| return; |
| } |
| } |
| |
| super.collectionPhase(phaseId, primary); |
| } |
| |
| /**************************************************************************** |
| * |
| * Miscellaneous |
| */ |
| |
| /** @return The active global plan as an <code>StickyImmix</code> instance. */ |
| private static StickyImmix global() { |
| return (StickyImmix) VM.activePlan.global(); |
| } |
| } |