RE: [Xen-devel] "virtual cluster" debug support

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> To my local tree I'm about to commit support for the notion of a
> "virtual cluster" for debugging purposes. The idea is that when one
> node (domain) in a cluster hits a breakpoint, all the other nodes are
> paused so that the first node doesn't get voted out of the quorum. I'd
> be very surprised if there are other potential users for this
> functionality, but I'm asking just in case.
> 
> The current implementation is done in such a way as to minimally
> perturb the existing interfaces to make it easy to carry it as an
> outside patch indefinitely. However, if others might use, it could be
> implemented more cleanly.

I guess the 'nice' way of doing this would be to have a notion of
'domain groups', akin to process groups. This would be pretty trivial to
hack in: 
 * add a group_id integer to the domain struct. 0 is special = not
grouped
 * add a domains struct * to create a circular list of domains in same
group
 * add a dom0_op to set the group of a domain (scan domain list, adjust
circular list)
 * on break point follow circular list issuing pause_domain(d)

Ian


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