N-ary tree for mapping a virtual memory space
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United States of America Patent
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Oct 24, 2017
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app pub date -
Dec 12, 2014
filing date -
Dec 12, 2014
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Abstract
A page table is a data structure used by a virtual memory system in a computer system to store the mapping between virtual addresses and physical addresses. Embodiments herein use a tree to map a virtual memory address space in the page table. The tree may be an N-ary tree where N is a power of two (e.g., 2, 4, 8, 16, etc.). The tree may include multiple levels that each correspond to a different page table size. For example, an octree includes eight different entries for each child node which may include per-thread sub-entries. Child nodes in the first level of the octree may each correspond to a 512 GiB page, while child nodes in the second level, however, may each have eight entries that correspond to a 64 GiB page. In this manner, an N-ary tree may be used to support a computing system with varying page sizes.
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