Memory Write Queue Handling to Preserve Sequentiality
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Solution Overview
Problem
Conventional memory systems experience increased write amplification and reduced data performance due to the loss of sequentiality in data access requests caused by multicore hardware processors, leading to inefficient garbage collection operations.
Innovation Solution
Process write requests on a memory system based on queue identifiers associated with the requests, using an inline approach to park and coalesce sequential write requests and an offline approach to organize data migration during garbage collection based on common queue identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional memory systems process write requests without queue identifier-based sequentiality maintenance, then device complexity is reduced, but write amplification increases and data performance deteriorates
Solution Approach 1:
The patent segments write requests into different queues based on queue identifiers (QIDs), allowing each queue to maintain sequentiality independently. This segmentation enables the system to preserve sequential access patterns for each queue while processing requests from multiple queues in parallel, thereby improving data performance without requiring complete sequential processing of all requests.
Solution Approach 2:
The patent performs preliminary actions by pre-establishing queue identifiers and their associated sequentiality constraints before write requests arrive. The system pre-organizes write requests into queues based on their QIDs, enabling efficient sequential processing without requiring complex real-time analysis during request processing.
2Loss of energy
If write requests are processed to maintain sequentiality using queue identifiers, then write amplification is reduced, but garbage collection overhead increases
Solution Approach 1:
The patent performs preliminary actions during normal write request processing by maintaining queue identifier-based sequentiality and organizing data migration during garbage collection. By pre-establishing the sequential order of writes and using queue identifiers to track data locations, the system can perform more efficient garbage collection operations that require less overhead.
Solution Approach 2:
The patent uses queue identifiers as feedback mechanisms to track the sequentiality of write requests and the locations of migrated data. This feedback information is used by the garbage collection process to optimize its operations, reducing the time and resources required for garbage collection by leveraging the sequentiality information already maintained during normal operation.
3Productivity
If sequentiality is maintained in data access requests through queue identifiers, then data performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the request processing system into multiple queues, each associated with a unique queue identifier. This segmentation allows the system to maintain sequentiality within each queue independently, simplifying the processing logic for each queue while enabling parallel processing across multiple queues. The complexity is distributed rather than concentrated in a single sequential processing path.
Data Source
AI summary
Various embodiments provide for processing write requests on a memory system based on queue identifiers associated with the write requests. In particular, input data streams can be received and stored by submission queues of a memory system, and write requests in the input data streams can be separated and processed based on queue identifiers associated with the submission queues using an inline approach for writing data on the memory system, an offline approach for writing data on the memory system, or both.