Day 2: Conference: User Mode Linux

Jeff Dike gave us an overview of his User Mode Linux work.


The idea is that the OS and its processes run as processes on the host kernel. The hardware is emulated, typically with files.

Processes are mapped to processes on the host kernel and the PID and owner are renumbered/renamed as needed. The main reason for this is to speed up context switching, but it does complicate context switching, debugging and signal handling.
Faults are implemented with signals. Memory faults for instance are handled with SIGSEGV and interrupts are handled with SIGIO.


What works?

What doesn't work are priviledged instructions and nesting.


Future work

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2001/01/28 (12:29): Version 1.0