Importance

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Abstract

A write barrier to stores into a partially relocated large or popular memory object facilitates bounded pause time implementations of relocating garbage collectors, including e.g., copying collectors, generational collectors, and collectors providing compaction. Such a write barrier allows a garbage collector implementation to interrupt relocation of large or popular memory objects so as to meet bounded pause time guarantees. A partially relocated object identifier store including 'copy from' identifier storage accessible to write barrier logic allows the write barrier logic to maintain consistency between FromSpace and ToSpace instances of a partially relocated memory object. 'Copy from' identifier storage allows the write barrier logic, or a trap handler responsive thereto, to broadcast a store-oriented memory access targeting the FromSpace instance to both FromSpace and ToSpace instances. Optional 'How far' indication storage facilitates differentiation by the write barrier logic between a copied portion and an uncopied portion of the partially relocated memory object.

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First Claim