Exploring XV6: A Journey into Operating System Fundamentals
Discover the history of Unix, learn about xv6 - an MIT reimplementation of Unix v6, and delve into its structure and system calls. Understand why studying old operating systems like xv6 is valuable in grasping modern OS concepts. Uncover the features, design, and services provided by monolithic kernels in xv6.
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Presentation Transcript
Advanced Operating Systems (CS 202) Presenter today: Bashar Romanous
Today Introduction to xv6 2
v6 Sixth Edition Unix a.k.a. Version 6 Unix First public release of Unix out of Bell Labs By Ken Thompson & Dennis Ritchie, 1975 Designed for DEC PDP-11* Original source code still available: http://minnie.tuhs.org/cgi-bin/utree.pl 3
Why not using v6 PDP11 is not used nowadays Missing some of the key issues in modern Oses Paging Multicore Luckily .. 4
xv6 xv6 is an MIT reimplementation of Unix v6 Runs on x86 But we will run it on top of QEMU Smaller than v6 Preserve basic structure (Processes, files, pipes. etc.) Runs on multicores Got paging in 2011 To understand it, you ll need to read its source code It s not that hard Textbook/commentary: xv6: a simple, Unix-like teaching operating system Online: https://pdos.csail.mit.edu/6.828/2018/xv6/book- rev11.pdf 5
Why xv6? Why study an old OS instead of Linux, Solaris, or Windows? 1: Big enough To illustrate basic OS design & implementation 2: Small enough To be (relatively) easily understandable 3: Similar enough To modern Oses Once you ve explored xv6, you will find your way insde kernels such as Linux 6
XV6 Structure Monolithic kernel Provides services to running programs Processes uses system calls to access system services When a process call a system call Execution will enter the the kernel space Perform the service Return to the user space 7
