MMU Caching Segmentation Data for Memory Access Speed
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Solution Overview
Problem
Current memory management techniques face a trade-off between storage capacity and access speed, and there is a continuous need for optimization as computing devices require ever-increasing memory system performance.
Innovation Solution
The proposed solution involves a memory access method that includes caching segmentation data using a Memory Management Unit (MMU) with an on-chip cache and segmentation unit, which centralizes the management of context specifiers, generates bindings between context indices and cache addresses, and enforces data formats to manage faults and violations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If context specifiers are stored in separate memory and fetched on demand, then storage capacity is optimized, but access speed deteriorates
Solution Approach 1:
The patent pre-fetches and caches context specifiers into the MMU's internal cache before they are needed for memory access operations. By preparing context specifiers in advance and storing them in the MMU cache, the system eliminates the need to fetch them from separate memory during critical memory access paths, thus resolving the contradiction between storage optimization and access speed.
2Speed
If context specifiers are cached in MMU, then memory access speed is improved, but device complexity increases
Solution Approach 1:
The patent designs the MMU to serve multiple functions: it not only performs traditional address translation but also caches context specifiers and manages segmentation information. By making the MMU a multi-functional component that handles both address translation and context specifier caching, the patent avoids adding separate dedicated caching hardware, thus improving memory access speed without proportionally increasing device complexity.
3Adaptability or versatility
If clients manage data formats and fault semantics, then system flexibility is improved, but ease of operation deteriorates
Solution Approach 1:
The patent introduces the MMU as an intermediary layer between clients and the memory system. The MMU centralizes the management of context specifiers, data formats, and fault semantics, shielding clients from these complexities. Clients simply issue memory access requests without needing to understand or manage the underlying data formats or fault handling mechanisms, thus improving ease of operation while maintaining system flexibility through the MMU's centralized control.
Data Source
AI summary
A memory access technique, in accordance with one embodiment of the present invention, includes caching segmentation data. The technique utilizes a separate memory for storing a plurality of context specifiers and an MMU. The MMU includes an on-chip cache and a segmentation unit. The MMU receives a location of a particular context specifier and a corresponding context index for each of one or more of the plurality of context specifiers stored in the separate memory. The segmentation unit retrieves the particular context specifier and caches it locally. The segmentation unit also binds the cache location of the particular context specifier to the corresponding context index. After caching one or more context specifiers and generating a corresponding binding, the segmentation unit may receive a memory access request that includes a given context index. A given context specifier that is cached locally is accessed by the segmentation unit using the context index to get a base address. The base address from the given context specifier is utilized by the segmentation unit to generate a virtual address for the memory access request.