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org.mmtk.plan.semispace
Class SSMutator

java.lang.Object
  extended by org.mmtk.plan.MutatorContext
      extended by org.mmtk.plan.SimpleMutator
          extended by org.mmtk.plan.StopTheWorldMutator
              extended by org.mmtk.plan.semispace.SSMutator
All Implemented Interfaces:
Constants
Direct Known Subclasses:
GCTraceMutator, SSGCspyMutator, UsePrimitiveWriteBarriersMutator
public class SSMutator
extends StopTheWorldMutator

This class implements per-mutator thread behavior and state for the SS plan, which implements a full-heap semi-space collector.

Specifically, this class defines SS mutator-time allocation and per-mutator thread collection semantics (flushing and restoring per-mutator allocator state).

See SS for an overview of the semi-space algorithm.

See Also:
SS, SSCollector, StopTheWorldMutator, MutatorContext

Field Summary
protected  CopyLocal ss
          Instance fields
 
Fields inherited from class org.mmtk.plan.MutatorContext
immortal, lgcode, log, los, nonmove, smcode
 
Fields inherited from interface org.mmtk.utility.Constants
ALIGNMENT_VALUE, ARRAY_ELEMENT, BITS_IN_ADDRESS, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_INT, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_INT, BYTES_IN_KBYTE, BYTES_IN_MBYTE, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, CARD_MASK, CARD_META_PAGES_PER_REGION, INSTANCE_FIELD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_INT, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_ADDRESS_SPACE, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_INT, LOG_BYTES_IN_KBYTE, LOG_BYTES_IN_MBYTE, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD, LOG_CARD_BYTES, LOG_CARD_GRAIN, LOG_CARD_META_BYTES, LOG_CARD_META_PAGES, LOG_CARD_META_SIZE, LOG_CARD_UNITS, LOG_MIN_ALIGNMENT, MAX_ALIGNMENT, MAX_BYTES_PADDING, MAX_INT, MIN_ALIGNMENT, MIN_INT, SUPPORT_CARD_SCANNING
 
Constructor Summary
SSMutator()
          Constructor
 
Method Summary
 Address alloc(int bytes, int align, int offset, int allocator, int site)
          Allocate memory for an object.
 void collectionPhase(short phaseId, boolean primary)
          Perform a per-mutator collection phase.
 Allocator getAllocatorFromSpace(Space space)
          Return the allocator instance associated with a space space, for this plan instance.
 void initMutator(int id)
          Called before the MutatorContext is used, but after the context has been fully registered and is visible to collection.
 void postAlloc(ObjectReference object, ObjectReference typeRef, int bytes, int allocator)
          Perform post-allocation actions.
 void show()
          Show the status of each of the allocators.
 
Methods inherited from class org.mmtk.plan.MutatorContext
addressBulkCopy, addressRead, addressTryCompareAndSwap, addressWrite, assertRemsetsFlushed, booleanBulkCopy, booleanRead, booleanWrite, byteBulkCopy, byteRead, byteWrite, charBulkCopy, charRead, charWrite, checkAllocator, deinitMutator, doubleBulkCopy, doubleRead, doubleWrite, extentBulkCopy, extentRead, extentWrite, floatBulkCopy, floatRead, floatWrite, flush, flushRememberedSets, getId, getLog, intBulkCopy, intRead, intTryCompareAndSwap, intWrite, javaLangReferenceReadBarrier, longBulkCopy, longRead, longTryCompareAndSwap, longWrite, objectReferenceBulkCopy, objectReferenceNonHeapRead, objectReferenceNonHeapWrite, objectReferenceRead, objectReferenceTryCompareAndSwap, objectReferenceWrite, offsetBulkCopy, offsetRead, offsetWrite, shortBulkCopy, shortRead, shortWrite, wordBulkCopy, wordRead, wordTryCompareAndSwap, wordWrite
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

ss

protected final CopyLocal ss
Instance fields

Constructor Detail

SSMutator

public SSMutator()
Constructor

Method Detail

initMutator

public void initMutator(int id)
Called before the MutatorContext is used, but after the context has been fully registered and is visible to collection.

Overrides:
initMutator in class MutatorContext
Parameters:
id - The id of this mutator context.

alloc

public Address alloc(int bytes,
                     int align,
                     int offset,
                     int allocator,
                     int site)
Allocate memory for an object.

Overrides:
alloc in class MutatorContext
Parameters:
bytes - The number of bytes required for the object.
align - Required alignment for the object.
offset - Offset associated with the alignment.
allocator - The allocator associated with this request.
site - Allocation site
Returns:
The low address of the allocated chunk.

postAlloc

public void postAlloc(ObjectReference object,
                      ObjectReference typeRef,
                      int bytes,
                      int allocator)
Description copied from class: MutatorContext
Perform post-allocation actions. For many allocators none are required.

Overrides:
postAlloc in class MutatorContext
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 number to be used for this allocation

getAllocatorFromSpace

public Allocator getAllocatorFromSpace(Space space)
Description copied from class: MutatorContext
Return the allocator instance associated with a space space, for this plan instance.

Overrides:
getAllocatorFromSpace in class MutatorContext
Parameters:
space - The space for which the allocator instance is desired.
Returns:
The allocator instance associated with this plan instance which is allocating into space, or null if no appropriate allocator can be established.

collectionPhase

public void collectionPhase(short phaseId,
                            boolean primary)
Perform a per-mutator collection phase. This is executed by one collector thread on behalf of a mutator thread.

Overrides:
collectionPhase in class SimpleMutator
Parameters:
phaseId - The unique phase identifier
primary - Should this thread be used to execute any single-threaded local operations?

show

public final void show()
Show the status of each of the allocators.

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