Re: Proposal for init/kexec/hotplug format for Xen

[Anthony Liguori <aliguori@us.ibm.com>]

Keir Fraser wrote:

> The IDC primitives are likely to be *so* low level that this will be a 
> non-issue. Anything that can needs to be fault-tolerance aware in any 
> way I think will be in higher layers.
>
> Really the libidc is almost a no-op -- we have shared memory and 
> notifications -- semaphores and message queues on top of that is very 
> little code.

I agree.

> You sound like you are more worried about the device-channel 
> setup/teardown/probe/recovery code. That would be above libidc, if we 
> use libidc at all.

I'm currently prototyping a semaphore mechanism.  One of the nice things 
I realized is that if a message queue uses semaphores, then something 
like xcs is unnecessary.

What I'm thinking about right now is how to assign out ports for 
notification.  It's somewhat non-trivial to figure out the best way to 
manage that.  Any thoughts?

Regards,
Anthony Liguori


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