Memory Controller Read Reclaim and Garbage Collection Scheduling
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Solution Overview
Problem
Existing memory systems face challenges in performing garbage collection and read reclaim operations without overlapping, which can lead to inefficiencies and reduced performance.
Innovation Solution
A memory system with a controller that manages read count values and generates level information for each memory block, allowing for non-overlapping garbage collection and read reclaim operations based on specific thresholds, ensuring efficient data management and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If garbage collection operation and read reclaim operation are performed simultaneously, then throughput may increase, but operation overlap causes interference and reduces reliability
Solution Approach 1:
The controller checks whether a read reclaim operation is already in progress before initiating a garbage collection operation. This preliminary check prevents overlapping operations by ensuring the memory block is available, thereby maintaining operation reliability while enabling throughput optimization when conditions permit
Solution Approach 2:
The system dynamically adjusts garbage collection scheduling based on the current state of read reclaim operations. The controller can defer, proceed, or prioritize operations based on real-time conditions, creating a flexible system that balances throughput and reliability according to operational context
2Speed
If read reclaim operation is performed frequently, then read performance is improved, but write performance deteriorates due to increased interference
Solution Approach 1:
The read reclaim operation is applied selectively to specific memory blocks based on their individual read count values and status, rather than uniformly across all blocks. This localized approach improves read performance for affected blocks while minimizing interference with write operations in other blocks
Solution Approach 2:
The system uses read count values as a parameter to determine when read reclaim should be performed. By monitoring and comparing read count values against thresholds, the system dynamically decides whether to initiate read reclaim, balancing read performance improvement against write operation interference
3Productivity
If garbage collection operation is performed frequently, then write performance is improved, but read performance deteriorates due to operation interference
Solution Approach 1:
The controller continuously monitors the status of read reclaim operations and uses this feedback to make informed decisions about garbage collection scheduling. This feedback mechanism ensures that garbage collection is performed optimally without interfering with ongoing read reclaim operations, maintaining both write throughput and read speed
4Productivity
If read count management is implemented, then operation scheduling is optimized, but system complexity increases
Solution Approach 1:
The memory blocks effectively self-report their readiness for garbage collection through their read count values. The controller simply needs to check these values and compare them against thresholds, allowing the system to self-optimize without requiring complex centralized control logic for every decision
Data Source
AI summary
Provided herein is a memory system and a method of operating the same. According to the present technology, a memory system performs a garbage collection operation based on a ratio of a read count value of a memory block with reference to a read count threshold value of a read reclaim operation. Consequently, the read reclaim operation and the garbage collection operation may be prevented from overlapping with each other.