Memory Block Validity Sync for Efficient Garbage Collection
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Solution Overview
Problem
Memory systems experience inefficiencies and performance degradation due to mismatches between host system and memory system data validity indications, leading to incorrect data movement during garbage collection and background operations.
Innovation Solution
The memory system identifies valid and invalid memory blocks by receiving a segment information table from the host system, transferring valid data to a new block, and designating the original block as free, thereby preserving valid data and optimizing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory system uses its own validity indications for garbage collection operations, then the memory system can autonomously manage data validity, but mismatches with host system validity indications cause incorrect data movement and performance degradation
Solution Approach 1:
The memory system receives validity indications from the host system and uses this feedback information to adjust its garbage collection operations. The memory system compares its own validity table with the host system's validity indications and modifies its data movement decisions accordingly, ensuring alignment between both systems' views of data validity.
Solution Approach 2:
The memory system introduces an intermediary mechanism that coordinates between the host system's validity indications and the memory system's internal validity table. This intermediary layer processes and reconciles the validity information from both sources, enabling coherent data movement decisions that respect both the host system's perspective and the memory system's state.
2Ease of operation
If the memory system performs garbage collection without host validity information, then operations can proceed independently, but data may be incorrectly identified as valid or invalid leading to performance degradation
Solution Approach 1:
The memory system performs preliminary actions by proactively receiving and processing validity indications from the host system before garbage collection operations begin. This advance preparation ensures that the memory system has accurate validity information ready when garbage collection starts, preventing incorrect data movement and reducing the need for corrective operations.
Solution Approach 2:
The memory system continuously monitors and updates its validity table based on feedback from the host system's validity indications. This feedback mechanism ensures that the memory system's internal state remains synchronized with the host system's view of data validity, enabling accurate and efficient garbage collection operations.
3Device complexity
If the memory system transfers all data during garbage collection, then data movement is simplified, but valid data may be unnecessarily moved causing inefficiency
Solution Approach 1:
The memory system applies local quality by selectively transferring only the portions of data that need to be moved, based on the validity information from the host system. Instead of transferring all data in a block, the memory system identifies and transfers only the invalid portions or only the valid portions depending on the specific validity indications received from the host system.
Solution Approach 2:
The memory system performs partial action by transferring only the necessary data during garbage collection operations. Using the host system's validity indications, the memory system determines the minimum required data transfer to maintain correctness, avoiding unnecessary data movement and reducing energy consumption.
Data Source
AI summary
Methods, systems, and devices for data block validity for maintenance operations are described. For example, a memory system may receive and store an indication of valid and invalid pages of a first memory block. As part of a release or background operation, the memory system may transfer data that is indicated to be valid from the first memory block to a second memory block. In some examples, the memory system may refrain from transferring the invalid data of the first memory block, while in other examples the memory system may also transfer the invalid data to a third memory block. The memory system may designate the first memory block as a free memory block in response to transferring the valid data, and may utilize the newly freed first memory block in subsequent access operations.