Re: [uml-devel] The UML scheduler

[Jeff D. <jd...@ad...>]

On Mon, May 16, 2005 at 11:37:49AM -0400, Young Koh wrote:
> Thank you for your reply. I have one following question.
> 
> in native Linux, a timer tick goes to the kernel, which has the
> previliege to save the current context and switch the running process.
> But UML kernel is just another user level process, even though it is
> tracing the application processes. in UML case, when a timer tick goes
> to the UML kernel, how does it stop the running process, which is
> another process?

Look at switch_to_{skas,tt}.  In tt mode, it's one process waking another
by writing to a pipe, then sleeping by reading its own pipe.  In skas mode,
it's a longjmp and a memory switch.

				Jeff