Re: [Xen-devel] How can Xen trigger a context switch in an HVM guest domain?

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

Context switching is a choice the guest OS has to make, and how that's
done will differ based on the operating system.  I think if you're
thinking about modifying the guest scheduler, you're probably better
off starting with Linux.  Even if there's a way to convince Windows to
call schedule() to pick a new process, I'm not sure you'll be able to
tell it *which* process to choose.

As far as mechanism on Xen's side, it would be easy enough to allocate
a "reschedule" event channel for the guest, such that whenever you
want to trigger a guest reschedule, just raise the event channel.

 -George

On Sat, Oct 31, 2009 at 11:02 AM, XiaYubin <xiayubin@xxxxxxxxx> wrote:
> Hi, all,
>
> As I'm doing some research in cooperative scheduling between Xen and
> guest domain, I want to know how many ways can Xen trigger a context
> switch inside an HVM guest domain (which runs Windows in my case). Do
> I have to write a driver (like balloon-driver)? Or a user process is
> enough? Or there is an even simpler way?
>
> All your suggestions are appreciated. Thanks! :)
>
> --
> Yubin
>
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>

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