Low-Latency Coherent Remote Memory Via Virtualized RDMA Page Faults
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Solution Overview
Problem
Conventional computing systems face inefficiencies in managing page faults for applications using unmapped virtual memory address spaces, leading to resource utilization challenges and high latency in accessing remote memory.
Innovation Solution
Implementing a page fault handler that virtualizes processor instructions to generate RDMA requests for remote memory servers, bypassing the need for physical memory mapping and minimizing latency through direct memory access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional memory management with physical mapping is used, then memory access follows traditional pathways, but latency is high and resource utilization is inefficient
Solution Approach 1:
The patent introduces a remote memory server as an intermediary between the client device and physical memory storage. The server mediates memory access requests by receiving RDMA requests from the client and servicing them directly, eliminating the need for traditional physical memory mapping on the client side while reducing access latency through optimized remote memory paths.
Solution Approach 2:
The patent replaces the traditional mechanical memory mapping system (page tables, translation lookaside buffers, and physical address translation) with a software-based virtual memory system. The client device uses unmapped virtual memory address spaces, and memory management is handled through virtualized processor instructions that generate RDMA requests, substituting hardware-based memory management with a more flexible software approach.
2Productivity
If virtual memory address spaces are unmapped from physical memory, then resource utilization improves, but page fault handling becomes complex and time-consuming
Solution Approach 1:
The patent implements a self-service memory management system where the client device's page fault handler autonomously virtualizes processor instructions and generates RDMA requests for remote memory access. This eliminates the need for complex inter-device coordination and traditional operating system-mediated page fault handling, allowing the system to manage its own memory operations efficiently with improved resource utilization.
3Loss of time
If direct memory access to remote servers is implemented, then latency is reduced, but maintaining memory coherence becomes challenging
Solution Approach 1:
The patent implements a feedback mechanism in the memory management system where the page fault handler monitors and tracks virtual memory regions and their corresponding remote memory locations. This feedback loop ensures that memory coherence is maintained by keeping track of memory access patterns and coordinating with the remote memory server to ensure consistent data states across the distributed memory system.
Data Source
AI summary
A system for managing shared remote memory includes a client device comprising a page fault handler and a virtual memory address space, a remote direct memory access (RDMA) network, and a remote memory server comprising a RDMA networking interface. The page fault handler is programmed to: obtain an application request associated with a virtual memory address of the virtual memory address space, decode the application request using the virtual memory address to identify a set of processor instructions in the application request, wherein each of the set of processor instructions invokes a page fault, generate, for each processor instruction, a RDMA request accessing a virtual memory region of the remote memory server, issue the RDMA request to the RDMA networking interface via the RDMA network, and adjust an instruction pointer of the processor instruction to service a second instruction pointer of the set of processor instructions.