org.mmtk.plan.immix

Class ImmixCollector

java.lang.Object

org.mmtk.plan.CollectorContext

org.mmtk.plan.ParallelCollector

org.mmtk.plan.SimpleCollector

org.mmtk.plan.StopTheWorldCollector

org.mmtk.plan.immix.ImmixCollector

Direct Known Subclasses:

StickyImmixCollector

public class ImmixCollector
extends StopTheWorldCollector

This class implements per-collector thread behavior and state for the Immix plan, which implements a full-heap immix collector.

Specifically, this class defines Immix collection behavior (through fastTrace and the collectionPhase method).

See Also:

for an overview of the immix algorithm.

FIXME The SegregatedFreeList class (and its decendents such as MarkSweepLocal) does not properly separate mutator and collector behaviors, so the immix field below should really not exist in this class as there is no collection-time allocation in this collector., Immix, MutatorLocal, StopTheWorldCollector, CollectorContext, Phase

Field Summary

Fields

Modifier and Type	Field and Description
protected ImmixAllocator	copy
protected TraceLocal	currentTrace
protected ImmixDefragTraceLocal	defragTrace
protected ImmixTraceLocal	fastTrace
protected CollectorLocal	immix
protected BumpPointer	immortal

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
ImmixCollector() Constructor

Method Summary

Modifier and Type	Method and Description
Address	allocCopy(ObjectReference original, int bytes, int align, int offset, int allocator) Allocate space for copying an object (this method does not copy the object, it only allocates space)
void	collectionPhase(short phaseId, boolean primary) Perform a (local, i.e.per-collector) collection phase.
TraceLocal	getCurrentTrace()
private static Immix	global()
void	postCopy(ObjectReference object, ObjectReference typeRef, int bytes, int allocator) Perform any post-copy actions.

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

copyCheckAllocator, getId, getLog, initCollector

Methods inherited from class java.lang.Object

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

Field Detail

fastTrace

protected ImmixTraceLocal fastTrace

defragTrace

protected ImmixDefragTraceLocal defragTrace

immix

protected CollectorLocal immix

copy

protected final ImmixAllocator copy

immortal

protected final BumpPointer immortal

currentTrace

protected TraceLocal currentTrace

Constructor Detail

ImmixCollector

public ImmixCollector()

Constructor

Method Detail

allocCopy

public Address allocCopy(ObjectReference original,
                         int bytes,
                         int align,
                         int offset,
                         int allocator)

Allocate space for copying an object (this method does not copy the object, it only allocates space)

Overrides:

allocCopy in class CollectorContext

Parameters:

original - The object that is being copied.

bytes - The size of the space to be allocated (in bytes)

align - Required alignment for the copy

offset - Offset associated with the alignment.

allocator - The allocator associated with this request

Returns:

The address of the first byte of the allocated region

postCopy

public void postCopy(ObjectReference object,
                     ObjectReference typeRef,
                     int bytes,
                     int allocator)

Description copied from class: CollectorContext

Perform any post-copy actions.

Overrides:

postCopy in class CollectorContext

Parameters:

object - The newly allocated object.

typeRef - the type reference for the instance being created.

bytes - The size of the space to be allocated (in bytes).

allocator - The allocator statically assigned to this allocation.

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 Immix global()

Returns:

The active global plan as an Immix instance.

getCurrentTrace

public final TraceLocal getCurrentTrace()

Overrides:

getCurrentTrace in class ParallelCollector

Returns:

The current fastTrace instance.