Host-Controlled Flash Memory Garbage Collection
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Solution Overview
Problem
Flash memory devices experience reduced usable storage space and slowed operations due to the accumulation of invalid pages, which traditional garbage collection methods fail to address effectively, leading to increased I/O latency and reduced performance.
Innovation Solution
A host-controlled system that selectively executes garbage collection in flash memory devices based on received information, allowing for dynamic adjustment of input/output latency by transmitting and receiving garbage collection instructions and parameters to optimize free space management and execution timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional automatic garbage collection is performed in flash memory devices, then storage space is reclaimed, but I/O latency increases and performance decreases
Solution Approach 1:
The host performs preliminary assessment of garbage collection needs by receiving information from the storage device about invalid page accumulation, and proactively initiates garbage collection operations before they become critical, rather than waiting for automatic triggering conditions to be met
Solution Approach 2:
The garbage collection execution is made dynamic and selective based on host-controlled decisions. The host can adjust garbage collection timing and frequency based on system conditions, workload characteristics, and performance requirements, transitioning between aggressive and conservative collection strategies as needed
2Quantity of substance
If garbage collection is performed frequently to maintain storage space, then free space is maintained, but device operation speed decreases
Solution Approach 1:
The host changes operational parameters by adjusting garbage collection frequency and intensity based on received information about invalid page ratios. The host can modify collection thresholds, timing, and resource allocation dynamically to optimize between maintaining free space and preserving operation speed
Solution Approach 2:
The host can choose to perform partial garbage collection on only the most critical memory blocks rather than exhaustive collection across all blocks. This selective approach maintains sufficient free space while minimizing the performance impact of collection operations
3Loss of time
If host controls garbage collection selectively, then I/O latency is reduced, but system complexity increases
Solution Approach 1:
The host acts as an intermediary between the storage device's automatic garbage collection mechanism and the overall system performance requirements. The host receives status information from the device, makes control decisions based on this information, and issues selective execution commands, thereby mediating between automatic device operation and system-wide performance optimization
Solution Approach 2:
The system implements feedback control where the host receives information about garbage collection status and invalid page accumulation from the storage device, uses this feedback to make informed decisions about when and how to execute garbage collection, and adjusts future collection behavior based on the results of previous operations
Data Source
AI summary
A host receives information related to garbage collection of a storage device, and the host controls selective execution of garbage collection by the storage device according to the received information.