Memory Subsystem Notification for Host Address Mapping Updates
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Solution Overview
Problem
In traditional computing environments, host systems face inefficiencies in updating logical-to-physical memory address mapping entries due to inconsistencies caused by garbage collection in memory sub-systems, leading to unnecessary resource expenditure and outdated mappings.
Innovation Solution
A notification mechanism is implemented within the memory sub-system to alert the host system of address mapping entry misses or mismatches, triggering an update of address mapping entries by reloading the latest versions from the memory sub-system during data requests, specifically when garbage collection processes alter these mappings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host system periodically reloads address mapping entries to ensure data accuracy, then the reliability of address mappings is improved, but the loss of time and computational resources increases due to unnecessary reloads
Solution Approach 1:
The memory sub-system monitors its own garbage collection operations and sends notifications to the host system when address mapping entries are invalidated. This feedback mechanism allows the host to reload only the specific entries that have changed, rather than periodically reloading all entries, thus maintaining reliability while reducing time loss.
Solution Approach 2:
The memory sub-system proactively invalidates and notifies the host about address mapping entries before the host would attempt to use them. By taking preliminary action to alert the host of upcoming changes, the system prevents the host from performing unnecessary reload operations, saving time while ensuring data accuracy.
2Loss of information
If the host system reloads address mapping entries frequently to maintain up-to-date mappings, then the currency of address mappings is improved, but the loss of energy and computational resources increases
Solution Approach 1:
The notification mechanism provides real-time feedback from the memory sub-system to the host system about address mapping changes. This allows the host to update its address mapping cache only when necessary, avoiding frequent reloads that would consume unnecessary energy while still maintaining up-to-date mappings.
Solution Approach 2:
The memory sub-system autonomously tracks its own garbage collection operations and self-manages the notification process to the host system. This self-service approach eliminates the need for the host to continuously query or periodically reload address mappings, reducing energy consumption while ensuring information currency.
3Productivity
If the host system implements a notification mechanism to receive updates on address mapping changes, then the productivity of address mapping management is improved, but the device complexity increases
Solution Approach 1:
The notification mechanism uses a simple feedback loop where the memory sub-system sends alerts to the host system about address mapping changes. This straightforward approach improves productivity by enabling timely updates without requiring complex bidirectional communication or sophisticated protocols, thus minimizing the increase in device complexity.
Solution Approach 2:
The notification mechanism acts as a simple intermediary channel between the memory sub-system and the host system. Rather than implementing complex synchronization protocols or shared memory structures, the patent uses a direct notification pathway that improves address mapping management efficiency while adding minimal complexity to the overall system architecture.
Data Source
AI summary
Various embodiments enable sending a notification to a host system based on an address mapping entry miss (or mismatch) on a memory sub-system, which can facilitate an update of one or more address mapping entries stored on the host system.