TreadmillDriver (Jikes RVM API)

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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
extends AbstractDriver

This class implements a simple driver for the MMTk LargeObjectSpace.

Field Summary
`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
`TreadmillDriver(ServerInterpreter server, String spaceName, LargeObjectSpace lospace, int blockSize, int threshold, boolean mainSpace)` Create a new driver for this collector

Method Summary
`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.