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Re: [Xen-devel] Domains not being destroyed properly

On Fri, 2011-06-24 at 14:36 +0100, Anthony Wright wrote:
> On 24/06/2011 14:01, Tim Deegan wrote:
> > Hi, 
> >
> > At 13:54 +0100 on 24 Jun (1308923697), Anthony Wright wrote:
> >> The problem is that I don't think there's enough information available
> >> from watching @releaseDomain to implement a reaper well. The
> >> xenstore-watch on @releaseDomain only tells you that a domain has died
> >> (to make things more complicated I actually get two notifications when a
> >> domain get's shutdown), it doesn't tell you which domain has died. A
> >> reaper would have to maintain a list of domains as they were before the
> >> notification to compare against the list after the notification to be
> >> able to issue a notification for the domain that has died.
> > That sounds awfully fragile.  It could get a list of all living domains
> > and reap qemus/xenstore data for any domain not in the list.  (Or, more
> > safely, enumerate all qemus and xenstore entries and check for each
> > whether the domain is alive). 
> Is this information still available after a domain has been destroyed? I
> was expecting that the watcher of @releaseDomain was only notified of a
> domain destruction after the domain had been completely destroyed

@releaseDomain fires after the domain has shutdown but _before_ the
domain is destroyed. This is necessary because @releaseDomain is the
signal to the toolstack that it is time to destroy the domain.

>  so
> there would be no information amount the domain available any more. Are
> you saying the would still be qemus/xenstore information available for
> the domain, and if so how does it get tidied up?
> Anthony.
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