Kernel Thread I/O Re-prioritization Offload
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Solution Overview
Problem
Conventional VTIOL processing is hindered by the offloading of numerous I/O operations, leading to slowdowns and delays in processing, which negatively impacts system performance, especially when handling high-priority tasks.
Innovation Solution
A virtual memory manager (VMM) with VTIOLR capability, where pending I/O operations are offloaded to kernel threads and re-prioritized by a VTIOLR thread, using specific schemes and tunable conditions to optimize processing and reduce blocking cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If I/O operations are offloaded to kernel threads, then processing throughput is improved, but processing delays and blocking cycles increase
Solution Approach 1:
The patent segments the I/O processing workload by introducing separate kernel threads (first kernel threads for offloaded operations, second kernel thread for re-prioritized operations) that handle different portions of I/O operations independently. This segmentation allows parallel processing of I/O operations, improving throughput while managing delays through dedicated processing channels.
Solution Approach 2:
The patent implements dynamic re-prioritization where the re-prioritization controller dynamically transfers I/O operations between kernel threads based on priority levels and processing conditions. This dynamic adjustment allows the system to adapt to varying workloads, ensuring high-priority operations receive timely attention while maintaining overall throughput.
2Ease of operation
If numerous I/O operations are offloaded, then system responsiveness is improved, but processing slowdowns occur
Solution Approach 1:
The patent applies partial action by having the VTIOLR thread handle only a portion of re-prioritization tasks rather than all operations. The system selectively re-prioritizes based on defined conditions (e.g., priority levels, operation types), which maintains responsiveness for critical operations while avoiding the overhead of re-prioritizing every single I/O operation, thus preventing processing slowdowns.
Solution Approach 2:
The re-prioritization controller acts as an intermediary between the VTIOL threads and the I/O operations. It mediates the transfer of operations between kernel threads, managing the balance between responsiveness and processing speed by selectively transferring only those operations that meet specific criteria, thereby avoiding unnecessary re-prioritization overhead.
3Device complexity
If I/O operations are handled at interrupt level, then processing simplicity is maintained, but blocking cycles and performance degradation occur
Solution Approach 1:
The patent segments the interrupt-level processing by introducing separate kernel threads that handle different categories of I/O operations. The first kernel threads handle offloaded operations while the second kernel thread handles re-prioritized operations, dividing the processing workload to maintain simplicity in each thread while improving overall system performance.
Solution Approach 2:
The re-prioritization controller serves as an intermediary layer between the simple interrupt-level handling and the more complex multi-threaded processing. It translates and manages I/O operations, transferring them between appropriate kernel threads based on priority and processing requirements, thus maintaining the simplicity of interrupt-level processing while enabling enhanced performance through structured multi-threaded execution.
Data Source
AI summary
A computing system is provided and includes first and second computing resources defined, during system initialization, as first kernel threads and a second kernel thread with which the first kernel threads are operably associated, a memory manager and a re-prioritization controller. The memory manager is configured to handle a portion of pending input/output (I/O) operations at an interrupt level and to offload a remainder of the pending I/O operations to the first kernel threads according to an offload condition whereby the offloaded I/O operations are queued according to a first scheme. The re-prioritization controller is configured to transfer a portion of the offloaded I/O operations from the first kernel threads to the second kernel thread according to a transfer condition whereby the transferred I/O operations are re-prioritized according to a second scheme.