Address Translation Context Switching via Independent Storage
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Solution Overview
Problem
Conventional context switches in computer processor testing are time-intensive and generate excessive unrelated data, making it difficult to identify errors due to the large number of memory accesses and instructions involved in system calls.
Innovation Solution
The method involves initializing a computer processor with a first context, storing information identifying the context in a control register, and then writing information for a second context to a memory address translation independent storage location, allowing for efficient switching by loading this information into the control register, reducing the number of cycles and instructions required for a context switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system calls are used to perform context switches, then address translation context switching is achieved, but execution time increases and data overhead increases
Solution Approach 1:
The patent extracts the essential context switch functionality from the complex system call sequence, isolating only the critical operation of changing the address translation context in the control register. This removes unnecessary memory accesses and instructions while preserving the core context switching capability, thereby reducing execution time and data overhead.
Solution Approach 2:
The patent segments the context switch operation into distinct components: storing context information in memory address translation independent storage, and selectively loading only the necessary control register information. This segmentation allows the system to perform minimal context switching operations without executing full system call sequences, reducing time loss.
2Reliability
If system calls are used to perform context switches, then address translation context switching is achieved, but data overhead increases making error identification difficult
Solution Approach 1:
The patent extracts only the essential context switching data from the system call sequence, storing it in memory address translation independent storage. This extraction eliminates unrelated data generation while preserving the functional information needed for context switching, thereby improving the signal-to-noise ratio of test case data and facilitating easier error identification.
3Adaptability or versatility
If conventional context switching is used, then translation context is changed, but cache clearing operations increase and impact test precision
Solution Approach 1:
The patent performs preliminary action by storing context information in memory address translation independent storage before the context switch is needed. This advance preparation allows the context switch to be executed by simply loading from pre-prepared storage locations, eliminating the need for cache clearing operations and maintaining measurement precision during testing.
Data Source
AI summary
A method for performing an address translation context switch includes initializing a computer processor to a first context by storing information identifying the first context in a control register of the computer processor. The first context specifies a mapping of virtual addresses of instructions to physical memory addresses in a first memory area. Information identifying a second context is stored in a memory address translation independent storage, where the second context specifies mapping of virtual addresses of instructions to physical memory addresses in a second memory area. The information identifying the second context is written to the control register of the computer processor.