Re: [Xen-devel] can't create any more pv-on-hvm domains after~38under 3.3-testing

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 03/12/2008 11:27, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> Alternatively it could be a combination of the gplpv drivers and netback
> or blkback. I'm pretty sure that I had the problem before I started
> testing pvscsi...
> 
> The machine I am testing on will be busy for the rest of the night, but
> tomorrow I'll do some testing and see what happens, unless you can
> suggest a way I could discover what those pages belong to in the
> meantime?

Unfortunately it's a bit of a pain in the butt since we don't have full page
tracking in Xen -- we only know that *someone* *somewhere* has that page
mapped for *some* purpose. Indeed even with more tracking Xen can only
really tell you which domain holds the reference, and that's bound to be
dom0 (unless this is a bogus refcounting bug in Xen itself).

I would suggest dumping addresses of interesting control pages in your
backend drivers (some can log that already if built with debugging I think),
then match up the address of the remaining page in the zombie domain.

 -- Keir



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