Memory Subsystem Namespace Isolation for VM Data Placement

Solution Overview

Problem

In virtualized memory sub-systems, existing technologies face challenges in managing data placement for direct-assigned virtual machines, leading to increased write amplification and interference between adjacent blocks, which affects performance and quality of service.

Innovation Solution

A memory sub-system controller creates isolated namespaces by allocating superblocks and assigning reclaim unit handles, allowing for physical isolation of data placement for each virtual machine, reducing write amplification and improving quality of service by minimizing block interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If data placement is managed for direct-assigned virtual machines in existing virtualized memory sub-systems, then virtual machine operations can be performed, but write amplification increases and interference between adjacent blocks occurs

Engineering Contradiction:

Improvevirtual machine operation efficiencyVSAvoidwrite amplification

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The memory device is divided into multiple independent namespaces, each namespace containing dedicated superblocks and reclaim units allocated to specific virtual machines. This segmentation isolates data placement for each virtual machine, preventing write amplification from affecting other virtual machines and eliminating block interference, thereby resolving the contradiction between operational efficiency and energy loss.

Inventive Principle:

Principle #1Segmentation

2Productivity

If data placement is managed for direct-assigned virtual machines in existing virtualized memory sub-systems, then virtual machine operations can be performed, but interference between adjacent blocks increases

Engineering Contradiction:

Improvevirtual machine operation efficiencyVSAvoidblock interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The memory device is divided into multiple independent namespaces, each namespace containing dedicated superblocks and reclaim units allocated to specific virtual machines. This segmentation isolates data placement for each virtual machine, preventing write amplification from affecting other virtual machines and eliminating block interference, thereby resolving the contradiction between operational efficiency and energy loss.

Inventive Principle:

Principle #1Segmentation

3Manufacturing precision

If isolated namespaces are created by allocating superblocks and assigning reclaim unit handles, then data placement control is improved and write amplification is reduced, but system complexity increases

Engineering Contradiction:

Improvedata placement control precisionVSAvoidnamespace management complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The controller automatically manages namespace creation, superblock allocation, and reclaim unit handle assignment without requiring manual intervention. The system self-configures the isolated namespaces and handles data placement control internally, reducing the perceived complexity for users while maintaining high precision data placement control.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20240320029A1Managing data placement for direct assigned virtual machines in a memory sub-system

Publication Date: 2024.09.26 MICRON TECHNOLOGY INC

AI summary

A memory system includes a memory device and a processing device coupled to the memory device, the processing device is to create a namespace by allocating a reclaim group, the reclaim group comprising a plurality of reclaim units; assign a reclaim unit handle to the namespace; receive, from a virtual machine running on a host computing system, a command to perform an operation associated with the namespace; identify a segment of the memory device based on the reclaim unit handle that is assigned to the namespace; and perform the operation on the segment of the memory device.