Memory Controller Garbage Collection Timing Based on Block Transition Speed
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Solution Overview
Problem
In memory systems, garbage collection is often performed unnecessarily, leading to resource consumption and overhead in data input/output operations, especially when there is sufficient space to store new data, which can degrade I/O performance and operating efficiency.
Innovation Solution
A method and apparatus for dynamically determining the operation mode and timing of garbage collection based on the transition speed of memory blocks, using a controller to assess the need for securing additional memory blocks by evaluating the ratio of valid and invalid data, and allocating resources accordingly to minimize unnecessary garbage collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If garbage collection is performed frequently to ensure sufficient space for new data, then the availability of free memory blocks is improved, but resource consumption and overhead increase
Solution Approach 1:
The garbage collection operation mode is dynamically adjusted based on the transition speed of memory blocks from free state to dirty state. When transition speed is high, the system performs garbage collection more frequently; when transition speed is low, it reduces or skips garbage collection. This dynamic adaptation resolves the contradiction by making resource consumption proportional to actual need rather than fixed.
Solution Approach 2:
The system changes the parameter of garbage collection frequency based on the calculated transition speed of memory blocks. By monitoring how quickly free blocks become dirty blocks and adjusting the garbage collection interval accordingly, the system optimizes the balance between maintaining free block availability and minimizing resource consumption.
2Productivity
If garbage collection is performed frequently to maintain free space, then I/O performance is improved, but operating efficiency deteriorates due to overhead
Solution Approach 1:
The garbage collection timing is dynamically determined based on the transition speed of memory blocks. Instead of fixed periodic execution, the system calculates when garbage collection is actually needed based on current memory block transition rates, making I/O performance improvement contingent on actual memory pressure rather than fixed schedule.
Solution Approach 2:
The system uses feedback from monitoring memory block transition speeds to determine garbage collection timing. By continuously observing how quickly free blocks become dirty and using this information to trigger or delay garbage collection, the system optimizes the balance between maintaining I/O performance and minimizing overhead time loss.
3Quantity of substance
If garbage collection is performed to secure additional memory blocks, then space availability is improved, but unnecessary operations occur when sufficient space already exists
Solution Approach 1:
The system performs preliminary assessment by calculating the transition speed of memory blocks and predicting future space needs before executing garbage collection. This preliminary action allows the system to determine whether garbage collection is actually necessary based on projected memory block transitions, avoiding unnecessary operations when sufficient space will be available.
Solution Approach 2:
The system changes the decision parameter for garbage collection from fixed thresholds to dynamic transition speed measurements. By monitoring the rate at which free blocks become dirty blocks and comparing this against required free block quantities, the system adjusts garbage collection execution to match actual space requirements rather than performing fixed periodic operations.
Data Source
AI summary
A memory system includes a memory device and a controller. The memory device includes a plurality of memory blocks, wherein the plurality of memory blocks includes one or more first memory blocks, each storing at least invalid data and one or more second memory blocks, each of which is blank. The controller is configured to determine a time or a period for performing garbage collection to secure an additional second memory block based at least on a transition speed representing a speed in which the second memory blocks is converted to the first memory blocks, the transition speed being determined based on a change between a first count of the first memory blocks and a second count of the second memory blocks.