1. Linux-List

A simple Linux linked list to prepresent Pokémon

2. Shell

Implementation of a shell directly calling system calls

A bare-metal bootable OS using assembly

3. Tabletop

A simple syscall reading the file descriptor table

4. Fridge: In-Kernel Key-Value Store

Assignment | Repo
A robust, high-concurrency, and thread-safe kernel kv pair

• Entries distributed across a fixed-length chained hash table
• Designed to prevent kernel panics, data corruption, or memory leaks. Robust against userspace abuse
• Dedicated SLAB cache, reducing memory fragmentation and improving cache locality
• Support producer-consumer blocking behaviors using Linux wait queues. Handles signals properly.

5. Freezer: Custom Linux Kernel Scheduler

Assignment | Repo
Freezer: A round-robin scheduling algorithm

• Static time slice
• Symmetric multiprocessing and load balancing
• Set and stress-tested as the default scheduler

Heater: A FIFO scheduler with a global run queue

Extensive performance evaluation under various environments and workloads

6. Farfetchd: Kernel Memory Introspection & Device Driver

Assignment | Repo

• Manual 5-level page walk
• Memory introspection with bvi
• Pseudo-device driver integration with ioctl()

7. EZFS: A Lightweight Filesystem

Assignment | Repo

• VFS integration: super_operations, inode_operations, file_operations
• Core operations: file lookup, directory reading/editing, custom file boundaries
• Fine-grained concurrency: thread-safe metadata handling
• Kernel module integration