Operating Systems (Spring 2024) | SNU Systems Software & Architecture Laboratory


   Please note the following information on the midterm exam:
   • Time: 12:30 - 13:45, April 25.
   • Location: #301-203
   • Scope: Textbook Chap. 2, 4-8, 13-16, 18-23, xv6 book Chap. 1, 2, 3.1-3.2, 3.6, 4, 5, 7.1-7.4 (+ materials covered by lecture slides and project assignments)
   • Closed-book exam
   • Bring your student ID

(Posted Apr 14, 2024)

   The third project assignment has been posted here. The due date is 11:59 PM, April 28.

(Posted Apr 11, 2024)

   The second project assignment has been posted here. The due date is 11:59 PM, April 7.

(Posted Mar 21, 2024)


The following schedule is tentative and subject to change without notice.

Day Topic Reading
3/5 Course overview
3/7 Introduction to operating systems 2
3/12 Architectural support for OS (Update on March 14) 6
3/19 Processes 4, 5
3/21 CPU scheduling 7, 8
3/25 Lab session 1 @ 7:00pm (Online)
3/26 Virtual memory 13, 14, 15, 16
4/2 Paging 18
4/4 Page tables 20
4/9 TLB 19
4/11 Memory mapping
4/15 Lab session 2 @ 7:00pm (Online)
4/16 Swapping 21, 22
4/18 Virtual Memory Implementations 23
4/23 Cancelled
4/25 Midterm Exam
4/30 Threads 26, 27
5/2 Locks 28
5/7 Semaphores 31
5/9 Monitors
5/14 Condition variables 30
5/16 Hard disk drives (HDDs) 36, 37
5/21 File systems 39
5/23 File system implementation 40
5/30 Fast file system 41
6/4 Solid state drives (SSDs) 44
6/6 National Holiday
6/11 File system consistency 42
6/13 Final Exam

Credit: Most of slides for this lecture are based on materials provided by the authors of the textbook and references.


For project submission and automatic grading, we are running a dedicated server at https://sys.snu.ac.kr. If you want to access the sys server outside of the SNU campus, please send a request via a Google Form whose URL is posted in the eTL.

Project #3: The EDF (Earliest Deadline First) Scheduler

Currently, the CPU scheduler of xv6 uses a simple round-robin policy. The goal of this project is to understand the scheduling subsystem ofxv6` by implementing the EDF (Earliest Deadline First) scheduler used in real-time systems.

  • Project specification available here
  • Due date: 11:59PM, April 28 (Sunday).

Project #2: System calls

System calls are the interfaces that allow user applications to request various services from the operating system kernel. This project aims to understand how those system calls are implemented in xv6.

  • Project specification available here
  • Due date: 11:59 PM, April 7 (Sunday).

Project #1: Hello world, xv6

xv6 is an instructional operating system developed by MIT based on Ken Thompson and Dennis Ritchie’s Unix version 6 (v6). In this course, we will use xv6-riscv, a version recently ported to a multi-core RISC-V machine. The goal of this project is to set up your development environment on Linux or macOS and familiarize yourself with our project submission server.

  • Project specification available here
  • Due date: 11:59 PM, March 18 (Monday).

xv6 Resources

Course Information

When 12:30 - 13:45 (Tuesday / Thursday)
Where Lecture room #301-203, Engineering Building I
Instructor Jin-Soo Kim
Professor, Dept. of Computer Science and Engineering, SNU
Language Korean
Course Description This course covers topics on general operating system concepts such as process management, memory management, I/O systems, and file systems, with the in-depth study on the latest Linux operating system. In addition, students are required to perform several hands-on projects with the xv6 instructional OS.
Textbook Remzi H. Arpaci-Dusseau and Andrea C. Arpaci-Dusseau, Operating Systems: Three Easy Pieces, Arpaci-Dusseau Books, August 2018 (Version 1.00)
Reference Thomas Anderson and Michael Dahlin, Operating Systems: Principles and Practice, 2nd Edition, Recursive Books, August 2014.
Andrew S. Tanenbaum and Herbert Bos, Modern Operating Systems, 5th Edition, Pearson, March 2022.
Prerequisites M1522.000800 System Programming
4190.308 Computer Architecture
Grading Exams: 60% (Midterm 25%, Final 35%)
Projects: 40%
* Grading policy is subject to change
Teaching Assistants Hyungjoon Kwon, Seungtaek Oh (snucsl.ta AT gmail.com)