General Purpose Register Spill Management via Dynamic Pool Segmentation
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Solution Overview
Problem
In processing units like GPUs, managing register spillage when higher priority instructions need to execute is challenging due to insufficient memory in general purpose registers (GPRs), leading to increased power consumption and delay in switching contexts or scheduling.
Innovation Solution
The implementation of a dual-pool GPR system with static and dynamic memory locations, where only dynamic memory locations are spilled to free space for higher priority instructions, allowing for efficient context switching and fair scheduling without spilling all memory locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If all memory locations in GPRs are spilled to free space for higher priority instructions, then sufficient storage space is available for high priority instructions, but power consumption increases and context switching delay increases
Solution Approach 1:
The GPR memory is segmented into two distinct pools: a static pool that retains data throughout instruction execution and a dynamic pool that can be spilled when needed. This segmentation allows selective spilling of only the dynamic pool portions, freeing sufficient space for high-priority instructions while minimizing the amount of data that needs to be spilled, thereby reducing power consumption and context switching delay.
Solution Approach 2:
The patent extracts only the necessary portions of data from the GPRs for spilling - specifically, only from the dynamic pool portions rather than all memory locations. This selective extraction minimizes the spilling operation scope, reducing both power consumption and switching delay while still providing adequate space for high-priority instruction execution.
2Area of stationary object
If all memory locations in GPRs are spilled for higher priority instructions, then sufficient storage space is available, but context switching delay increases
Solution Approach 1:
By segmenting GPR memory into static and dynamic pools, the patent enables selective spilling operations that affect only the dynamic portions. This reduces the scope of context switching operations, minimizing delay while still providing necessary storage space for high-priority instructions.
Solution Approach 2:
The patent applies partial action by spilling only the necessary dynamic pool portions rather than all GPR memory locations. This partial spilling provides sufficient space for high-priority instructions while minimizing the time required for the spilling operation, thus reducing context switching delay.
3Productivity
If a dual-pool GPR system is implemented with static and dynamic memory locations, then selective spilling is enabled for fast context switching, but device complexity increases
Solution Approach 1:
The GPR structure is segmented into static and dynamic pools, which adds organizational complexity but enables efficient selective spilling operations. The segmentation allows the system to quickly identify and spill only the dynamic portions when context switching is needed, improving productivity despite the increased structural complexity.
Solution Approach 2:
The dynamic pool portion of the GPRs is designed to be adjustable and reconfigurable during execution, allowing flexible allocation and spilling operations. This dynamic characteristic enables fast context switching by allowing the system to adaptively manage memory resources based on priority requirements, justifying the increased device complexity through significant performance gains.
Data Source
AI summary
Techniques are described for copying data only from a subset of memory locations allocated to a set of instructions to free memory locations for higher priority instructions to execute. Data from a dynamic portion of one or more general purpose registers (GPRs) allocated to the set of instructions may be copied and stored to another memory unit while data from a static portion of the one or more GPRs allocated to the set of instructions may not be copied and stored to another memory unit.