Interrupt Controller State Filtering for Processing Unit Stability
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Solution Overview
Problem
Existing interrupt handling systems risk overloading processing units due to unfiltered interrupt requests, leading to potential errors and inefficiencies, as they either queue low-priority requests or delay them, without preventing overflow from processing interrupt handlers.
Innovation Solution
An interrupt controller that filters and prioritizes requests based on predetermined criteria, including system state analysis, to grant or deny interrupts, reducing incorrect requests and managing processing capacity by autonomously determining the system state and predicting interrupt patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interrupt requests are propagated to the processing unit without filtering, then all interrupt requests are processed, but the processing unit becomes overloaded and errors occur
Solution Approach 1:
The interrupt controller performs preliminary analysis of the system state and predicts interrupt patterns before granting interrupts to the processing unit. By evaluating whether the current system state matches expected states for each interrupt type, the controller pre-filters inappropriate interrupts, preventing overload before it occurs while maintaining the ability to process valid interrupts efficiently
Solution Approach 2:
The interrupt controller acts as an intermediary between peripheral devices and the processing unit. It intercepts interrupt requests, analyzes them against predicted patterns and current system state, and selectively forwards only appropriate interrupts to the processing unit. This mediation prevents the processing unit from receiving excessive or incorrect interrupts while ensuring valid interrupts are processed
2Reliability
If interrupt requests are delayed or queued with low priority, then the processing unit is protected from overload, but the responsiveness to legitimate interrupts is reduced
Solution Approach 1:
The system performs preliminary analysis of interrupt requests against predicted patterns and current system state before granting them. This pre-evaluation ensures that legitimate interrupts are identified and granted immediately without delay, while only inappropriate interrupts are blocked, thus maintaining fast response times for valid interrupts while preventing overload
3Loss of information
If all interrupt requests are granted to the processing unit, then complete coverage of all events is achieved, but the processing unit overflows due to excessive processing load
Solution Approach 1:
The interrupt controller performs preliminary prediction of interrupt patterns and evaluation of system state before granting interrupts. This pre-filtering mechanism identifies and blocks only those interrupts that do not match expected patterns or would cause overload, while allowing all legitimate interrupts to pass through, thus maintaining information completeness without overwhelming the processing unit
Solution Approach 2:
The interrupt controller serves as an intelligent intermediary that selectively filters interrupt requests based on pattern prediction and system state analysis. It preserves all valid interrupt information by allowing matching requests through while blocking only inappropriate ones, maintaining completeness without transferring excessive load to the processing unit
Data Source
AI summary
An request controller for controlling requests of a processing unit. The request controller may include an request controller input for receiving an request and an request processing unit connected to the request controller input. The request may request to switch a context of said processing unit or to switch the processing unit from a current an operation to another operation. The request processing unit may decide on the request based on a decision criterion. An request controller output may be connected to the request processing unit, for outputting information about at least granted request. The request processing unit may include a control logic unit including: a state input for receiving information about a current state of a system including the processing unit; and a request input for receiving information about a received request. The control logic unit may be arranged to determine whether the received request belongs to the current state of the processor, to grant the request when the received request does belong to the current state and to reject the request in case the request does not belong to the current state. The control logic unit may further include a control logic output for outputting an request grant signal when the request is granted.