TLB0 Data Structure for Direct Memory Access
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Solution Overview
Problem
Current memory access mechanisms in processing environments require re-translation and additional tests for memory pages, even after initial translation, which hinders system performance and accessibility.
Innovation Solution
A data structure called Translation Lookaside Buffer 0 (TLB0) is introduced, which stores designations of memory units that are immediately accessible, eliminating the need for address translation and other tests, allowing for direct read/write access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If translated addresses are maintained in a buffer for easy access, then address translation time is saved, but additional tests still need to be performed and memory pages are not readily accessible
Solution Approach 1:
The patent segments the memory access verification process into two distinct data structures: TLB0 for memory pages that are fully verified and ready for direct access, and TLB1 for memory pages that require additional tests. This segmentation allows the system to differentiate between memory pages needing immediate access versus those requiring verification, resolving the contradiction between saving translation time and ensuring accessibility.
Solution Approach 2:
The patent implements preliminary verification actions by performing address translation and accessibility tests in advance before actual memory access. Verified memory pages are pre-placed in TLB0 with their translated addresses, so when access is needed, no translation or testing is required - the page is immediately accessible. This preliminary action eliminates the contradiction by preparing memory pages ahead of time.
2Ease of operation
If all memory pages undergo address translation and testing, then accessibility is ensured, but system performance is reduced due to repeated operations
Solution Approach 1:
The system performs address translation and accessibility testing in advance during memory page loading, placing verified pages in TLB0. This preliminary action ensures accessibility is maintained while avoiding repeated translation and testing operations during subsequent memory accesses, thereby preserving system performance.
Solution Approach 2:
The patent creates a copy of the verified memory page information in TLB0, which includes the translated address and verification status. This copy allows the system to access memory pages without re-performing the original translation and testing operations, maintaining both accessibility and performance by using the pre-verified copy rather than re-verifying.
3Speed
If a data structure stores only translated addresses, then memory access speed is improved, but further testing is still required for complete accessibility
Solution Approach 1:
The patent segments memory page verification into two stages: first translating addresses and storing in TLB1, then performing additional accessibility tests and moving verified pages to TLB0. This segmentation ensures that only memory pages confirmed to be fully accessible are stored in TLB0, guaranteeing reliability while maintaining fast access speeds for those pages.
Solution Approach 2:
The patent applies different quality levels to different memory page entries in the data structure. TLB0 contains only memory pages that have passed all verification tests and are guaranteed accessible, while TLB1 contains pages needing verification. This local quality differentiation ensures that accesses to TLB0 pages are both fast and reliable, resolving the contradiction between speed and reliability.
Data Source
AI summary
A data structure of readily accessible units of memory is provided. The data structure includes designations of one or more units of memory that while represented in the data structure do not need expensive address translation, other tests or special handling in order to access the units of memory. By employing such a data structure, memory access and system performance are enhanced.