org.mmtk.policy

Class MarkCompactLocal

java.lang.Object

org.mmtk.utility.alloc.Allocator

org.mmtk.utility.alloc.BumpPointer

org.mmtk.policy.MarkCompactLocal

public final class MarkCompactLocal
extends BumpPointer

This class implements unsynchronized (local) elements of a sliding mark-compact collector. Allocation is via the bump pointer (@see BumpPointer).

See Also:

BumpPointer, MarkCompactSpace

Field Summary

Fields inherited from class org.mmtk.utility.alloc.BumpPointer

allowScanning, BLOCK_MASK, cursor, DATA_END_OFFSET, DATA_START_OFFSET, initialRegion, LOG_BLOCK_SIZE, MAX_DATA_START_OFFSET, MINIMUM_DATA_SIZE, NEXT_REGION_OFFSET, region, REGION_LIMIT_OFFSET, space

Constructor Summary

Constructors

Constructor and Description
MarkCompactLocal(MarkCompactSpace space) Constructor

Method Summary

Modifier and Type	Method and Description
void	flush() Flush this thread-local component in preparation for the mutator thread to die.
protected Extent	maximumRegionSize() Maximum size of a single region.
private MarkCompactSpace	mcSpace()
void	prepare() Prepare for collection: update the metadata for the current region, and flush this bump-pointer's allocations to the global page list.

Methods inherited from class org.mmtk.utility.alloc.BumpPointer

alloc, allocSlowOnce, checkRegionMetadata, clearNextRegion, gcspyGatherData, gcspyGatherData, getCursor, getDataEnd, getDataStart, getNextRegion, getRegionLimit, getSpace, isRegionAligned, linearScan, rebind, reset, reusePages, setDataEnd, setNextRegion, setRegionLimit, show, updateLimit

Methods inherited from class org.mmtk.utility.alloc.Allocator

alignAllocation, alignAllocation, alignAllocationNoFill, allocSlow, allocSlowInline, determineCollectionAttempts, fillAlignmentGap, getMaximumAlignedSize, getMaximumAlignedSize

Methods inherited from class java.lang.Object

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

Constructor Detail

MarkCompactLocal

public MarkCompactLocal(MarkCompactSpace space)

Constructor

Parameters:

space - The space to bump point into.

Method Detail

mcSpace

private MarkCompactSpace mcSpace()

prepare

public void prepare()

Prepare for collection: update the metadata for the current region, and flush this bump-pointer's allocations to the global page list.

flush

public void flush()

Flush this thread-local component in preparation for the mutator thread to die.

maximumRegionSize

protected Extent maximumRegionSize()

Description copied from class: BumpPointer

Maximum size of a single region. Important for children that implement load balancing or increments based on region size.

Overrides:

maximumRegionSize in class BumpPointer

Returns:

the maximum region size