Content-Addressable Memory Entries for In-Flight Resource Ordering
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Solution Overview
Problem
Conventional microprocessors face memory hazards and resource access conflicts due to multiple instructions operating on the same data or competing for limited resources, necessitating efficient linked list management to ensure atomic processing and fair resource access.
Innovation Solution
A memory system with content-addressable entries that automatically establish and retire resource-based linked lists, allowing parallel searching and tracking of in-flight instances of access, eliminating the need for external control circuits and enabling scalable, low-overhead management of resource access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional memory structures are used to track multiple instructions accessing the same data, then memory hazards can occur due to lack of ordering control, but if traditional linked lists are used externally to ensure ordering, then hardware overhead and complexity increase
Solution Approach 1:
The patent merges the linked list management functionality directly into the memory system by integrating content-addressable entries with linked list pointers within the same memory structure. This combination eliminates the need for separate external linked list management hardware, reducing overall system complexity while maintaining reliable ordering control for instructions accessing the same data.
Solution Approach 2:
The memory system provides self-service by automatically maintaining the ordering of instructions through its content-addressable entries and linked list structure. The system autonomously tracks and orders instructions without requiring external control circuits, allowing the memory structure to serve its own organizational needs while ensuring memory hazard avoidance.
2Reliability
If multiple separate linked lists are used to manage access to different resources, then resource access ordering can be ensured, but the hardware overhead and management complexity increase significantly
Solution Approach 1:
The patent implements a universal linked list structure within the memory system that can manage multiple resources through a single unified mechanism. The content-addressable entries and associated pointers serve multiple functions by tracking different resources and their access orders within the same memory structure, eliminating the need for multiple separate linked list management systems.
3Productivity
If content-addressable entries are used to track resource access instances, then parallel searching and automatic linked list establishment can occur, but memory structure complexity increases
Solution Approach 1:
The patent segments the memory structure into distinct content-addressable entries, each with its own associated linked list pointers. This segmentation allows parallel searching of different entries while maintaining organized tracking of resource access instances. Each segment operates independently yet contributes to the overall ordering function, enabling parallel processing without requiring a monolithic complex structure.
Data Source
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AI summary
A memory system with content-addressable entries supporting scalable, low overhead, in-fight establishment and retirement of resource-based linked lists, and related methods of operation and computer-readable media. The memory system can be used to track and establish an ordering of in-flight instances of access to a resource through a linked-list of content-addressable entries established in the memory system corresponding to such resource. Entries in the memory system that represent instances of access to a given resource can each be established as part of a linked list associated for the given resource to track a priority order for multiple instances of access the resource and then retired when an instance of access has been completed as part of a tracking system, such as to avoid hazards. The memory system provides a way to establish entries in a linked list for in flight instances of access to a resource for ordering and tracking.