Truncate Operations in Nonvolatile Memory
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Solution Overview
Problem
Current methods for power-loss recovery (PLR) and reclaim operations in flash memory face challenges due to sequential addressing restrictions, which limit the ability to go back to previously programmed areas, necessitating improved techniques that comply with these restrictions while performing truncate operations.
Innovation Solution
The solution involves tracking only the most recent truncate operation in volatile memory, allowing truncate operations to be performed while complying with sequential addressing requirements, and optimizing memory usage by invalidating and reclaiming data efficiently, thus avoiding bit-twiddling and enabling effective PLR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current methods for PLR and reclaim operations are used, then power-loss recovery and space reclamation can be performed, but sequential addressing restrictions prevent accessing previously programmed areas and require costly bit-twiddling processes
Solution Approach 1:
The patent applies preliminary action by pre-positioning truncate objects at sequential locations before they are needed. When a truncate operation is requested, the system has already prepared the target location in advance, allowing immediate completion without needing to revisit previous programmed areas or perform complex bit-twiddling operations. This resolves the contradiction by enabling reliable truncate functionality while avoiding the complexity of backward access and bit manipulation.
2Reliability
If truncate operations track all invalidated data in volatile memory, then complete PLR recovery is possible, but memory overhead and processing complexity increase significantly
Solution Approach 1:
The patent extracts only the essential information needed for PLR recovery by tracking solely the most recent truncate object in volatile memory. Rather than monitoring all invalidated data throughout the file system, the solution isolates and tracks only the critical truncate metadata required for recovery. This reduces memory overhead and processing complexity while maintaining sufficient reliability for power-loss recovery scenarios.
Solution Approach 2:
The patent applies discarding and recovering by allowing truncate objects to be discarded from volatile memory tracking once they are safely persisted to nonvolatile memory. The system recovers only the necessary truncate information when needed for PLR operations, rather than continuously maintaining complete tracking of all invalidated data. This approach reduces ongoing memory overhead and processing complexity while preserving recovery capability.
3Reliability
If sequential addressing requirements are enforced, then memory wear is reduced and reliability improved, but the ability to perform reclaim operations on previously programmed blocks is restricted
Solution Approach 1:
The patent resolves this contradiction by performing preliminary action—pre-positioning truncate objects at sequential locations before reclaim operations are needed. This allows the system to maintain sequential addressing compliance (improving reliability and reducing wear) while still enabling efficient reclaim operations, because the truncate metadata is already in place and does not require revisiting previously programmed blocks.
Data Source
AI summary
Various embodiments for performing truncate operations in nonvolatile memory are described. In one embodiment, an apparatus may include a nonvolatile memory to perform one or more truncate operations on a data file written to the nonvolatile memory and a volatile memory to track a truncate operation performed in the nonvolatile memory. Other embodiments are described and claimed.