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The garbage collectors for Jikes RVM are provided by MMTk. The MMTk: The Memory Manager Toolkit describes MMTk and gives a tutorial on how to use and edit it and is the best place to start.  A detailed description of the call chain from the compilers through to MMTk here is another good place to start understanding how MMTk integrates with JikesRVM.  Anatomy of a Garbage Collector describes the major building blocks of an MMTk collector and Scanning Objects in JikesRVM describes how objects are scanned for their pointer fields during GC.

The RVM can be configured to employ various different allocation managers taken from the MMTk memory management toolkit. Managers divide the available space up as they see fit. However, they normally subdivide the available address range to provide:

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