Microarchitectural Scratchpad State Restore for Fast Context Switching
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Solution Overview
Problem
Modern processors face challenges in maintaining pattern recognition abilities of microarchitectural registers due to frequent context switches, as they may not be sufficiently warmed up before switching to a new program, leading to repeated pattern recognition and increased latency.
Innovation Solution
Implementing a microarchitectural scratchpad to store program state data, including the state of microarchitectural registers, allowing processors to restore the program state immediately upon context switch, thereby reducing the need for a warm-up period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequent context switches are performed to handle multiple programs, then program execution flexibility is improved, but microarchitectural register warm-up time is lost repeatedly
Solution Approach 1:
The patent stores the state of microarchitectural registers in a buffer during program execution. When a context switch occurs, the previously executed program's register state is retrieved from the buffer and restored, effectively performing the warm-up action in advance and eliminating the need for repeated warm-up periods.
Solution Approach 2:
The patent creates a copy of the microarchitectural register state and stores it in a buffer. This copy can be quickly restored when needed, allowing the processor to resume program execution without repeating the pattern recognition process that occurred during the original warm-up period.
2Ease of operation
If microarchitectural register state is not restored during context switch, then context switching simplicity is maintained, but pattern recognition ability deteriorates
Solution Approach 1:
The buffer stores the microarchitectural register state in advance during program execution. When context switching occurs, this pre-stored state is retrieved and restored, ensuring pattern recognition ability is maintained without adding complexity to the context switching mechanism itself.
3Reliability
If buffer size is increased to store more program state data, then program state restoration completeness is improved, but memory resource consumption increases
Solution Approach 1:
The patent selectively stores the state of microarchitectural registers in the buffer, focusing on the specific components needed for pattern recognition rather than storing the entire processor state. This targeted approach ensures restoration completeness for critical components while minimizing memory resource consumption.
Data Source
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AI summary
Aspects of the disclosed technology include techniques and mechanisms for restoring program states using microarchitectural scratchpads. A processor is configured to store, in a buffer, program state data which indicates a current state of microarchitectural registers therein during execution of a current program. Based on receiving a command to terminate execution of the current program and restore execution of a different program, the processor retrieves, from the buffer, the program state data associated with the program to be executed and restores the retrieved data.