org.mmtk.plan.concurrent

Class Concurrent

java.lang.Object

org.mmtk.plan.Plan

org.mmtk.plan.Simple

org.mmtk.plan.concurrent.Concurrent

Direct Known Subclasses:

CMS

public abstract class Concurrent
extends Simple

This class implements the global state of a concurrent collector.

Field Summary

Fields

Modifier and Type	Field and Description
static short	CLEAR_BARRIER_ACTIVE
static short	CONCURRENT_CLOSURE
protected static short	concurrentClosure Perform the initial determination of liveness from the roots.
static short	FLUSH_COLLECTOR
static short	FLUSH_MUTATOR
private boolean	inConcurrentCollection
protected static short	postSanityPhase Validate, build and validate the second sanity table
protected static short	preemptConcurrentClosure When we preempt a concurrent marking phase we must flush mutators and then continue the closure.
protected static short	preSanityPhase Build, validate and then build another sanity table
static short	SET_BARRIER_ACTIVE

Fields inherited from class org.mmtk.plan.Simple

CLOSURE, collection, collectionAttempt, COMPLETE, completeClosurePhase, FINALIZABLE, finishPhase, FORWARD, FORWARD_FINALIZABLE, FORWARD_REFS, forwardPhase, INITIATE, initPhase, PHANTOM_REFS, POST_SANITY_PLACEHOLDER, PRE_SANITY_PLACEHOLDER, PREPARE, PREPARE_STACKS, prepareStacks, refTypeClosurePhase, RELEASE, rootClosurePhase, ROOTS, SANITY_BUILD_TABLE, SANITY_CHECK_TABLE, SANITY_COPY_ROOTS, SANITY_PREPARE, SANITY_RELEASE, SANITY_ROOTS, SANITY_SET_POSTGC, SANITY_SET_PREGC, sanityBuildPhase, sanityCheckPhase, SET_COLLECTION_KIND, SOFT_REFS, STACK_ROOTS, WEAK_REFS, WEAK_TRACK_REFS

Fields inherited from class org.mmtk.plan.Plan

ALLOC_CODE, ALLOC_COLD_CODE, ALLOC_DEFAULT, ALLOC_GCSPY, ALLOC_HOT_CODE, ALLOC_IMMORTAL, ALLOC_LARGE_CODE, ALLOC_LOS, ALLOC_NON_MOVING, ALLOC_NON_REFERENCE, ALLOC_PRIMITIVE_LOS, ALLOC_STACK, allocationSiteCount, ALLOCATORS, concurrentWorkers, controlCollectorContext, DEFAULT_MAX_NURSERY, DEFAULT_MIN_NURSERY, DEFAULT_SITE, defaultCollectorContext, emergencyCollection, GATHER_WRITE_BARRIER_STATS, GC_PREPARE, GC_PROPER, IMMORTAL, immortalSpace, insideHarness, internalTriggeredCollection, LARGE_CODE, largeCodeSpace, lastInternalTriggeredCollection, LOS, loSpace, MAX_NON_LOS_COPY_BYTES, MAX_NON_LOS_DEFAULT_ALLOC_BYTES, MAX_NON_LOS_NONMOVING_ALLOC_BYTES, META, metaDataSpace, NEEDS_LOG_BIT_IN_HEADER, NON_MOVING, NON_PARTICIPANT, nonMovingSpace, NOT_IN_GC, parallelWorkers, pretenureThreshold, SANITY, sanityChecker, sanitySpace, SCAN_BOOT_IMAGE, SMALL_CODE, smallCodeSpace, stacksPrepared, totalTime, USE_CODE_SPACE, userTriggeredCollection, VM_SPACE, vmSpace

Constructor Summary

Constructors

Constructor and Description
Concurrent() Constructor.

Method Summary

Modifier and Type	Method and Description
void	collectionPhase(short phaseId) Perform a (global) collection phase.
protected boolean	concurrentCollectionRequired() This method controls the triggering of an atomic phase of a concurrent collection.
boolean	lastCollectionFullHeap()
void	processOptions() The processOptions method is called by the runtime immediately after command-line arguments are available.

Methods inherited from class org.mmtk.plan.Simple

replacePhase, replacePlaceholderPhase, switchNurseryZeroingApproach

Methods inherited from class org.mmtk.plan.Plan

availableMemory, bootTimeWriteBarrier, collectionRequired, determineThreadCount, enableAllocation, enableCollection, forceFullHeapCollection, freeMemory, fullyBooted, gcInProgress, gcInProgressProper, getAllocationSite, getCollectionReserve, getPagesAvail, getPagesReserved, getPagesUsed, getSpecializedScanClass, getTotalPages, handleUserCollectionRequest, harnessBegin, harnessEnd, insertPhaseAfter, isCurrentGCNursery, isEmergencyCollection, isInitialized, isInternalTriggeredCollection, isUserTriggeredCollection, lastCollectionWasExhaustive, loadObjectReference, logPoll, notifyExit, poll, preCollectorSpawn, printDetailedTiming, printPostStats, printPreStats, printUsedPages, registerSpecializedMethods, reservedMemory, resetCollectionTrigger, sanityExpectedRC, sanityLinearScan, setBuildTimeGCByte, setGCStatus, spawnCollectorThreads, stacksPrepared, startGCspyServer, storeObjectReference, stressTestGCRequired, totalMemory, triggerInternalCollectionRequest, usedMemory, willNeverMove

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

FLUSH_MUTATOR

public static final short FLUSH_MUTATOR

SET_BARRIER_ACTIVE

public static final short SET_BARRIER_ACTIVE

FLUSH_COLLECTOR

public static final short FLUSH_COLLECTOR

CLEAR_BARRIER_ACTIVE

public static final short CLEAR_BARRIER_ACTIVE

preemptConcurrentClosure

protected static final short preemptConcurrentClosure

When we preempt a concurrent marking phase we must flush mutators and then continue the closure.

CONCURRENT_CLOSURE

public static final short CONCURRENT_CLOSURE

concurrentClosure

protected static final short concurrentClosure

Perform the initial determination of liveness from the roots.

preSanityPhase

protected static final short preSanityPhase

Build, validate and then build another sanity table

postSanityPhase

protected static final short postSanityPhase

Validate, build and validate the second sanity table

inConcurrentCollection

private boolean inConcurrentCollection

Constructor Detail

Concurrent

public Concurrent()

Constructor.

Method Detail

processOptions

public void processOptions()

The processOptions method is called by the runtime immediately after command-line arguments are available. Allocation must be supported prior to this point because the runtime infrastructure may require allocation in order to parse the command line arguments. For this reason all plans should operate gracefully on the default minimum heap size until the point that processOptions is called.

Overrides:

processOptions in class Plan

collectionPhase

public void collectionPhase(short phaseId)

Description copied from class: Simple

Perform a (global) collection phase.

Overrides:

collectionPhase in class Simple

Parameters:

phaseId - The unique id of the phase to perform.

concurrentCollectionRequired

protected boolean concurrentCollectionRequired()

Description copied from class: Plan

This method controls the triggering of an atomic phase of a concurrent collection. It is called periodically during allocation.

Overrides:

concurrentCollectionRequired in class Plan

Returns:

true if a collection is requested by the plan.

lastCollectionFullHeap

public boolean lastCollectionFullHeap()

Overrides:

lastCollectionFullHeap in class Plan

Returns:

Whether last GC is a full GC.