Hierarchical Memory with a Virtual Warm-Page Buffer Zone
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Solution Overview
Problem
Existing computing systems face inefficiencies due to repeated promoting and demoting of data between fast and slow memory tiers, leading to significant computational overhead and performance degradation from 'warm' pages with intermediate access frequencies.
Innovation Solution
Implementing an intermediate memory zone within the slow memory, which is a virtual zone, to manage data with intermediate access frequencies, reducing repeated migrations by using metadata changes to move data within this zone without physical copying, and dynamically adjusting its size based on access patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is frequently promoted and demoted between fast and slow memory tiers, then memory utilization is optimized, but computational overhead increases and performance degrades
Solution Approach 1:
The patent introduces a buffer zone as an intermediary layer between fast and slow memory tiers. This buffer zone captures data during migration and allows completion of ongoing memory operations before finalizing the migration. By using this intermediary buffer, the system avoids the overhead of repeated full migrations while maintaining optimized memory utilization, as data can be staged in the buffer without immediately triggering costly migration operations.
2Productivity
If data migration between memory tiers is performed immediately, then memory hierarchy efficiency is improved, but system performance degrades due to operation interruptions
Solution Approach 1:
The patent implements a buffer zone that acts as a cushioning mechanism before data migration is finalized. When data is identified for migration, it is first placed in the buffer zone rather than immediately moved to the target memory tier. This allows ongoing memory operations to complete without interruption, and only after these operations finish does the system proceed with the actual migration from the buffer zone, thereby cushioning the performance impact.
3Loss of energy
If an intermediate memory zone is introduced to reduce migration frequency, then computational overhead is reduced, but memory system complexity increases
Solution Approach 1:
The patent implements the buffer zone as a virtual copy mechanism within the existing memory address space. Rather than adding a completely separate physical memory structure, the system creates a virtual buffer zone that can be allocated from available memory resources. This virtual copying approach reduces the complexity increase compared to adding entirely new hardware structures, as it leverages existing memory management capabilities to create the intermediate zone.
Data Source
AI summary
A hierarchical memory system and method. In some embodiments, the method includes: demoting a first page of data from a fast memory to a slow memory; promoting the first page of data from the slow memory to an intermediate memory zone; and promoting the first page of data from the intermediate memory zone to the fast memory, wherein the intermediate memory zone includes a virtual zone within the slow memory.