FTL Mapping Table Region Loading Without Concurrent Overwrites
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Concurrent loading requests for regions of the Flash Translation Layer (FTL) mapping table in a memory sub-system can lead to data corruption due to overwriting of updates, as existing region load operations are not atomic, causing operational errors and performance issues.
Innovation Solution
Implementing a 'loading' state to track the status of FTL mapping table regions, preventing concurrent load operations by discarding duplicate requests when a region is in progress, ensuring complete and updated regions are loaded before use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If concurrent load requests are allowed for FTL mapping table regions, then system throughput and responsiveness are improved, but data corruption occurs due to overwriting of updates
Solution Approach 1:
The system performs a preliminary check of the loading state before initiating a load operation. By checking whether a region is already in a 'loading' state before starting a new load request, the system prevents concurrent load operations that would cause data corruption, while still allowing efficient sequential processing of load requests
Solution Approach 2:
The system implements a feedback mechanism by maintaining and checking the loading state of each FTL mapping table region. This state information feeds back into the load request handling logic, enabling the system to make informed decisions about whether to proceed with or discard load requests based on current region status
2Measurement precision
If region load operations are performed frequently to ensure updated data, then data freshness is improved, but operational errors increase due to concurrent access conflicts
Solution Approach 1:
Before executing a region load operation, the system performs a preliminary state check to determine if the region is already loading. This preliminary action prevents initiating duplicate load operations that would create conflicts, while still ensuring that load operations are performed when necessary to maintain data freshness
Solution Approach 2:
The loading state acts as an intermediary mechanism between multiple load requests and the actual load operation. This intermediary state information coordinates access to regions, preventing operational errors from concurrent access while allowing the system to maintain up-to-date data through appropriate load operations
Data Source
AI summary
A processing device in a memory sub-system receives a request to load a region of a plurality of regions of a translation layer mapping table from a non-volatile memory device to a volatile memory device and determines whether the region is in either a loaded or a loading state. Responsive to determining that the region is not in either the loaded or the loading state, the processing device initiates a region load operation to load the region from the non-volatile memory device to the volatile memory device.