org.mmtk.utility.gcspy.drivers

Class TreadmillDriver

java.lang.Object

org.mmtk.utility.gcspy.drivers.AbstractDriver

org.mmtk.utility.gcspy.drivers.TreadmillDriver

Direct Known Subclasses:

GenLOSDriver

public class TreadmillDriver
extends AbstractDriver

This class implements a simple driver for the MMTk LargeObjectSpace.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	allTileNum
private static boolean	DEBUG
protected Address	maxAddr
protected ShortStream	objectsStream
protected ShortStream	refFromImmortalStream
protected ShortStream	rootsStream
protected Subspace	subspace
protected int	threshold
protected int	totalObjects
protected int	totalRefFromImmortal
protected int	totalRoots
protected int	totalUsedSpace
protected IntStream	usedSpaceStream

Fields inherited from class org.mmtk.utility.gcspy.drivers.AbstractDriver

blockSize, changed, control, CONTROL_BACKGROUND, CONTROL_LINK, CONTROL_SEPARATOR, CONTROL_UNUSED, CONTROL_USED, maxTileNum, mmtkSpace, myClass, name, server, serverSpace, streams

Constructor Summary

Constructors

Constructor and Description
TreadmillDriver(ServerInterpreter server, String spaceName, LargeObjectSpace lospace, int blockSize, int threshold, boolean mainSpace) Create a new driver for this collector

Method Summary

Modifier and Type	Method and Description
private ShortStream	createObjectsStream()
private ShortStream	createRefFromImmortalStream()
private ShortStream	createRootsStream()
private IntStream	createUsedSpaceStream()
protected String	getDriverName() Get the name of this driver type.
boolean	handleReferenceFromImmortalSpace(Address addr) Handle a direct reference from the immortal space.
boolean	handleRoot(Address addr) Handle a root address
void	resetData() Reset the tile stats for all streams, including values used for summaries
void	resetRootsStream() Reset the roots Stream.
void	scan(Address addr) Update the tile statistics In this case, we are accounting for super-page objects, rather than simply for the objects they contain.
protected void	setupSummaries() Setup summaries part of the transmit method.
void	transmit(int event) Transmit the data if this event is of interest to the client

Methods inherited from class org.mmtk.utility.gcspy.drivers.AbstractDriver

addControl, addStream, controlIsBackground, controlIsSeparator, controlIsUnused, controlIsUsed, controlValues, countTileNum, countTileNum, createServerSpace, createSubspace, getControl, getMaxTileNum, getServerSpace, initControl, initControls, isConnected, maxObjectsPerBlock, scan, scan, scan, send, setControl, setRange, setRange, setSpaceInfo, setTilenames

Methods inherited from class java.lang.Object

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

Field Detail

DEBUG

private static final boolean DEBUG

See Also:

Constant Field Values

usedSpaceStream

protected IntStream usedSpaceStream

objectsStream

protected ShortStream objectsStream

rootsStream

protected ShortStream rootsStream

refFromImmortalStream

protected ShortStream refFromImmortalStream

subspace

protected Subspace subspace

allTileNum

protected int allTileNum

totalObjects

protected int totalObjects

totalUsedSpace

protected int totalUsedSpace

totalRoots

protected int totalRoots

totalRefFromImmortal

protected int totalRefFromImmortal

maxAddr

protected Address maxAddr

threshold

protected int threshold

Constructor Detail

TreadmillDriver

public TreadmillDriver(ServerInterpreter server,
                       String spaceName,
                       LargeObjectSpace lospace,
                       int blockSize,
                       int threshold,
                       boolean mainSpace)

Create a new driver for this collector

Parameters:

server - The name of the GCspy server that owns this space

spaceName - The name of this driver

lospace - the large object space for this allocator

blockSize - The tile size

threshold - the size threshold of the LOS

mainSpace - Is this the main space?

Method Detail

getDriverName

protected String getDriverName()

Description copied from class: AbstractDriver

Get the name of this driver type.

Specified by:

getDriverName in class AbstractDriver

Returns:

The name, "MMTk TreadmillDriver" for this driver.

createUsedSpaceStream

private IntStream createUsedSpaceStream()

createObjectsStream

private ShortStream createObjectsStream()

createRootsStream

private ShortStream createRootsStream()

createRefFromImmortalStream

private ShortStream createRefFromImmortalStream()

resetData

public void resetData()

Reset the tile stats for all streams, including values used for summaries

Overrides:

resetData in class AbstractDriver

scan

public void scan(Address addr)

Update the tile statistics In this case, we are accounting for super-page objects, rather than simply for the objects they contain.

Overrides:

scan in class AbstractDriver

Parameters:

addr - The address of the superpage

transmit

public void transmit(int event)

Transmit the data if this event is of interest to the client

Specified by:

transmit in class AbstractDriver

Parameters:

event - The event, either BEFORE_COLLECTION, SEMISPACE_COPIED or AFTER_COLLECTION

setupSummaries

protected void setupSummaries()

Setup summaries part of the transmit method.

Override this method to setup summaries of additional streams in subclasses.

handleRoot

public boolean handleRoot(Address addr)

Handle a root address

Parameters:

addr - Root Address

Returns:

true if the given Address is in this subspace.

resetRootsStream

public void resetRootsStream()

Reset the roots Stream.
The roots Stream has to be reset separately because we do not gather data in the usual way using scan().

handleReferenceFromImmortalSpace

public boolean handleReferenceFromImmortalSpace(Address addr)

Handle a direct reference from the immortal space.

Overrides:

handleReferenceFromImmortalSpace in class AbstractDriver

Parameters:

addr - The Address

Returns:

true if the given Address is in this subspace.