MMU Sparse Mapping Hardware Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current systems face performance degradation and latency issues when managing sparse textures due to page faults, and existing software-based solutions are inefficient and error-prone.
Innovation Solution
A system with a memory management unit (MMU) that uses a page table with multiple entries to translate virtual memory addresses to physical addresses, determines active sparse status, and handles access requests without generating page faults, thereby eliminating latency and improving execution speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sparse textures are used to reduce memory usage, then memory efficiency is improved, but page faults occur causing performance degradation
Solution Approach 1:
The patent introduces an ancillary data structure as an intermediary between the software application and the graphics memory. This data structure tracks which portions of sparse textures are resident in graphics memory, allowing the system to manage sparse textures without experiencing performance degradation from page faults. The intermediary absorbs the complexity of managing sparse mappings, freeing the graphics processing pipeline to operate efficiently.
2Reliability
If an ancillary data structure is created to manage sparse textures, then page faults are avoided, but execution speed is reduced due to traversal overhead
Solution Approach 1:
The system performs preliminary actions by pre-configuring the ancillary data structure with information about which texture portions are resident in memory before access occurs. The software application specifies sparse textures with metadata indicating resident and non-resident portions, allowing the MMU to make deterministic decisions about memory access without requiring runtime traversal or page fault handling.
Solution Approach 2:
The patent replaces the software-based ancillary data structure traversal mechanism with a hardware-based MMU implementation. The MMU automatically manages sparse mappings using page table entries with sparse status bits, eliminating the need for software to manually traverse and manage ancillary data structures. This hardware substitution removes the execution speed penalty while maintaining page fault avoidance.
3Adaptability or versatility
If software-based sparse texture management is implemented, then sparse mappings are supported, but the solution is tedious, time-consuming, and error-prone
Solution Approach 1:
The MMU implements self-service by automatically managing sparse texture mappings without requiring software application involvement. The hardware unit autonomously tracks which texture portions are resident in memory using page table entries, and automatically handles memory access requests to sparse textures. This eliminates the tedious and error-prone manual management of ancillary data structures by software developers.
Data Source
AI summary
One embodiment of the present invention includes a memory management unit (MMU) that is configured to manage sparse mappings. The MMU processes requests to translate virtual addresses to physical addresses based on page table entries (PTEs) that indicate a sparse status. If the MMU determines that the PTE does not include a mapping from a virtual address to a physical address, then the MMU responds to the request based on the sparse status. If the sparse status is active, then the MMU determines the physical address based on whether the type of the request is a write operation and, subsequently, generates an acknowledgement of the request. By contrast, if the sparse status is not active, then the MMU generates a page fault. Advantageously, the disclosed embodiments enable the computer system to manage sparse mappings without incurring the performance degradation associated with both page faults and conventional software-based sparse mapping management.