GenMSCollector (Jikes RVM API)

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org.mmtk.plan.generational.marksweep
Class GenMSCollector

java.lang.Object
  org.mmtk.plan.CollectorContext
      org.mmtk.plan.ParallelCollector
          org.mmtk.plan.SimpleCollector
              org.mmtk.plan.StopTheWorldCollector
                  org.mmtk.plan.generational.GenCollector
                      org.mmtk.plan.generational.marksweep.GenMSCollector

All Implemented Interfaces:: Constants

public class GenMSCollector
extends GenCollector
extends GenCollector

This class implements per-collector thread behavior and state for the GenMS two-generational copying collector.

Specifically, this class defines semantics specific to the collection of the mature generation (GenCollector defines nursery semantics). In particular the mature space allocator is defined (for collection-time allocation into the mature space), and the mature space per-collector thread collection time semantics are defined.

See Also:: for a description of the GenMS algorithm., GenMS, GenMSMutator, GenCollector, StopTheWorldCollector, CollectorContext

Field Summary
`private MarkSweepLocal`	`mature` The allocator for the mature space
`private GenMSMatureTraceLocal`	`matureTrace`

Fields inherited from class org.mmtk.plan.generational.GenCollector
`arrayRemset, los, modbuf, nurseryTrace, remset`

Fields inherited from class org.mmtk.plan.SimpleCollector
`sanityLocal`

Fields inherited from class org.mmtk.plan.ParallelCollector
`group`

Fields inherited from class org.mmtk.plan.CollectorContext
`log`

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

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
`GenMSCollector()` Constructor

Method Summary
`Address`	`allocCopy(ObjectReference original, int bytes, int align, int offset, int allocator)` Allocate space for copying an object (this method does not copy the object, it only allocates space)
`void`	`collectionPhase(short phaseId, boolean primary)` Perform a (local, i.e.per-collector) collection phase.
`TraceLocal`	`getFullHeapTrace()`
`private static GenMS`	`global()`
`void`	`postCopy(ObjectReference object, ObjectReference typeRef, int bytes, int allocator)` Perform any post-copy actions.

Methods inherited from class org.mmtk.plan.generational.GenCollector
`getCurrentTrace`

Methods inherited from class org.mmtk.plan.StopTheWorldCollector
`collect, concurrentCollect, concurrentCollectionPhase`

Methods inherited from class org.mmtk.plan.ParallelCollector
`parallelWorkerCount, parallelWorkerOrdinal, park, rendezvous, run`

Methods inherited from class org.mmtk.plan.CollectorContext
`copyCheckAllocator, getId, getLog, initCollector`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

mature

private final MarkSweepLocal mature

The allocator for the mature space

matureTrace

private final GenMSMatureTraceLocal matureTrace

Constructor Detail

GenMSCollector

public GenMSCollector()

Constructor

Method Detail

allocCopy

public final Address allocCopy(ObjectReference original,
                               int bytes,
                               int align,
                               int offset,
                               int allocator)

Allocate space for copying an object (this method does not copy the object, it only allocates space)

Overrides:: allocCopy in class CollectorContext

Parameters:: original - The object that is being copied.; bytes - The size of the space to be allocated (in bytes); align - Required alignment for the copy; offset - Offset associated with the alignment.; allocator - The allocator associated with this request
Returns:: The address of the first byte of the allocated region

postCopy

public final void postCopy(ObjectReference object,
                           ObjectReference typeRef,
                           int bytes,
                           int allocator)

Description copied from class: CollectorContext

Perform any post-copy actions.

Overrides:: postCopy in class CollectorContext

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 statically assigned to this allocation.

collectionPhase

public void collectionPhase(short phaseId,
                            boolean primary)

Perform a (local, i.e.per-collector) collection phase.

Overrides:: collectionPhase in class GenCollector

Parameters:: phaseId - The unique phase identifier; primary - Should this thread be used to execute any single-threaded local operations?

getFullHeapTrace

public final TraceLocal getFullHeapTrace()

Specified by:: getFullHeapTrace in class GenCollector

Returns:: The trace to use when collecting the mature space

global

private static GenMS global()

Returns:: The active global plan as a GenMS instance.