org.mmtk.policy

Class LargeObjectLocal

java.lang.Object

org.mmtk.utility.alloc.Allocator

org.mmtk.utility.alloc.LargeObjectAllocator

org.mmtk.policy.LargeObjectLocal

public final class LargeObjectLocal
extends LargeObjectAllocator

Each instance of this class is intended to provide fast, unsynchronized access to a treadmill. Therefore instances must not be shared across truly concurrent threads (CPUs). Rather, one or more instances of this class should be bound to each CPU. The shared VMResource used by each instance is the point of global synchronization, and synchronization only occurs at the granularity of acquiring (and releasing) chunks of memory from the VMResource.

If there are C CPUs and T TreadmillSpaces, there must be C X T instances of this class, one for each CPU, TreadmillSpace pair.

Field Summary

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

space

Constructor Summary

Constructors

Constructor and Description
LargeObjectLocal(BaseLargeObjectSpace space) Constructor

Method Summary

Modifier and Type	Method and Description
void	gcspyGatherData(int event, TreadmillDriver losDriver) Gather data for GCSpy from the nursery
void	gcspyGatherData(int event, TreadmillDriver losDriver, boolean tospace) Gather data for GCSpy for an older space
void	prepare(boolean fullHeap) Prepare for a collection.
void	release(boolean fullHeap) Finish up after a collection.

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

alloc, allocSlowOnce, getSpace, show

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

LargeObjectLocal

public LargeObjectLocal(BaseLargeObjectSpace space)

Constructor

Parameters:

space - The treadmill space to which this thread instance is bound.

Method Detail

prepare

public void prepare(boolean fullHeap)

Prepare for a collection. Clear the treadmill to-space head and prepare the collector. If paranoid, perform a sanity check.

Parameters:

fullHeap - whether the collection will be full heap

release

public void release(boolean fullHeap)

Finish up after a collection.

Parameters:

fullHeap - whether the collection was full heap

gcspyGatherData

public void gcspyGatherData(int event,
                            TreadmillDriver losDriver)

Gather data for GCSpy from the nursery

Parameters:

event - the gc event

losDriver - the GCSpy space driver

gcspyGatherData

public void gcspyGatherData(int event,
                            TreadmillDriver losDriver,
                            boolean tospace)

Gather data for GCSpy for an older space

Parameters:

event - the gc event

losDriver - the GCSpy space driver

tospace - gather from tospace?