org.mmtk.plan.generational

Class GenCollector

java.lang.Object

org.mmtk.plan.CollectorContext

org.mmtk.plan.ParallelCollector

org.mmtk.plan.SimpleCollector

org.mmtk.plan.StopTheWorldCollector

org.mmtk.plan.generational.GenCollector

Direct Known Subclasses:

GenCopyCollector, GenImmixCollector, GenMSCollector

public abstract class GenCollector
extends StopTheWorldCollector

This abstract class implements per-collector thread behavior and state for generational copying collectors.

Specifically, this class defines nursery collection behavior (through nurseryTrace and the collectionPhase method). Per-collector thread remset consumers are instantiated here (used by sub-classes).

See Also:

Gen, GenMutator, StopTheWorldCollector, CollectorContext

Field Summary

Fields

Modifier and Type	Field and Description
protected AddressPairDeque	arrayRemset
protected LargeObjectLocal	los
protected ObjectReferenceDeque	modbuf
protected GenNurseryTraceLocal	nurseryTrace
protected AddressDeque	remset

Fields inherited from class org.mmtk.plan.SimpleCollector

sanityLocal

Fields inherited from class org.mmtk.plan.ParallelCollector

group

Fields inherited from class org.mmtk.plan.CollectorContext

log

Constructor Summary

Constructors

Constructor and Description
GenCollector() Constructor Note that the collector is a consumer of remsets, while the mutator is a producer.

Method Summary

Modifier and Type	Method and Description
void	collectionPhase(short phaseId, boolean primary) Perform a (local, i.e.per-collector) collection phase.
TraceLocal	getCurrentTrace()
abstract TraceLocal	getFullHeapTrace()
private static Gen	global()

Methods inherited from class org.mmtk.plan.StopTheWorldCollector

collect, concurrentCollect, concurrentCollectionPhase

Methods inherited from class org.mmtk.plan.ParallelCollector

parallelWorkerCount, parallelWorkerOrdinal, park, rendezvous, run

Methods inherited from class org.mmtk.plan.CollectorContext

allocCopy, copyCheckAllocator, getId, getLog, initCollector, postCopy

Methods inherited from class java.lang.Object

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

Field Detail

nurseryTrace

protected final GenNurseryTraceLocal nurseryTrace

los

protected final LargeObjectLocal los

modbuf

protected final ObjectReferenceDeque modbuf

remset

protected final AddressDeque remset

arrayRemset

protected final AddressPairDeque arrayRemset

Constructor Detail

GenCollector

public GenCollector()

Constructor

Note that the collector is a consumer of remsets, while the mutator is a producer. The GenMutator class is responsible for construction of the WriteBuffer (producer).

See Also:

GenMutator

Method Detail

collectionPhase

public void collectionPhase(short phaseId,
                            boolean primary)

Perform a (local, i.e.per-collector) collection phase.

Overrides:

collectionPhase in class SimpleCollector

Parameters:

phaseId - The unique phase identifier

primary - Should this thread be used to execute any single-threaded local operations?

global

private static Gen global()

Returns:

The active global plan as a Gen instance.

getCurrentTrace

public final TraceLocal getCurrentTrace()

Overrides:

getCurrentTrace in class ParallelCollector

Returns:

The current trace instance.

getFullHeapTrace

public abstract TraceLocal getFullHeapTrace()

Returns:

The trace to use when collecting the mature space