Memory Band Garbage Collection for Stable Free Space and IOPS
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Solution Overview
Problem
Managing memory space in a computer system with non-uniform workloads is challenging due to instability in free space and input/output operations per second (IOPS), as existing methods fail to efficiently select memory bands for garbage collection based on system characteristics like data velocity and workload non-uniformity.
Innovation Solution
Classifying memory bands into hot and cold types based on data velocity and implementing garbage collection using separate queues for each type, dynamically managing free space to stabilize IOPS by relocating valid data during garbage collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If garbage collection is implemented on bands belonging to two band validity tiers sequentially in a single garbage collection stream, then the memory system can reclaim free space, but the free space size and IOPS become unstable due to inability to adapt to non-uniform workloads
Solution Approach 1:
The patent divides the garbage collection process into separate streams for different band validity tiers (first validity tier and second validity tier). This segmentation allows independent management of hot/cold bands, enabling the system to adapt to non-uniform workloads by selectively processing bands based on their validity characteristics, thereby stabilizing free space while maintaining reclamation effectiveness
2Productivity
If dynamic tuning of separation point and interleaving ratio is implemented, then performance metrics can be optimized, but the system complexity increases and tuning becomes challenging
Solution Approach 1:
The patent implements self-tuning mechanisms where the system automatically adjusts garbage collection parameters based on observed workload patterns and band validity distributions. The controller monitors performance metrics and dynamically modifies separation points and interleaving ratios without external intervention, reducing tuning complexity while maintaining optimization for non-uniform workloads
3Stability of the object's composition
If memory bands are classified and processed separately based on data velocity, then IOPS stability improves, but the device complexity increases due to multiple queues and management overhead
Solution Approach 1:
The patent segments memory bands into multiple validity tiers and creates separate garbage collection streams for each tier. This segmentation enables targeted processing of hot and cold bands, improving IOPS stability by preventing unnecessary operations on stable data while maintaining efficient reclamation of invalid data. The segmented approach manages complexity through structured organization rather than monolithic processing
Data Source
AI summary
This application is directed to managing garbage collection using a plurality of queues of memory bands of a memory system. The memory system obtains a request to organize data stored in a plurality of memory bands of the memory system, and each memory band has a data validity level. In response to the request, the memory system generates the plurality of queues of memory bands based on the data validity levels of the plurality of memory bands, and the plurality of queues correspond to a plurality of non-overlapping validity level ranges. The plurality of memory bands are assigned into a subset of queues based on the data validity levels of the plurality of memory bands. The memory system 200 allocates a first memory bandwidth among the subset of queues, and implements garbage collection operations on the subset of queues in parallel using respective portions of the first memory bandwidth.