Real Case Implementation

Environment Setup

The USM environment configuration requires compiling a patched Linux kernel included in this repository. This step is mandatory to enable the necessary functionalities for USM operation.

Introduction to USM Configuration

Setting up USM requires building a custom patched Linux kernel and components from source. The process involves cloning the flusm repository, installing build dependencies with critical attention to ensuring dwarves version ≤ 1.22, and compiling the provided kernel source, which represents the most time-consuming step of the installation process.

Final Verification of USM Installation

After installation, you must configure GRUB to reserve 2GB memory for CMA, disable system swap since USM handles its own swapping mechanism, and reboot into the new kernel. Finally, build the userspace API and kernel module, then load the USM module to complete the setup.

First Allocation Policy

The implementation focuses on creating a custom first-fit memory allocation policy in USM. The process involves four key steps: defining a policy structure with comprehensive page management using linked lists to track free and used pages.

Environment Verification

Verification of the USM environment

USM Waker Loading Process

Terminal 1 Loading of usmWaker component

Project Execution

Terminal 2 Running the project configuration

Terminal 3 Execution of the target application

First Eviction Policy

USM eviction policies handle memory pressure by swapping less-used pages to disk when free memory runs out. This mechanism ensures optimal memory utilization under resource constraints.