Re: [Xen-devel] long latency of domain shutdown

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 9/5/08 11:23, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

> Indeed, the extended version below avoids this.
> 
>> In actuality, since we know that we never have 'cross-domain' pagetable type
>> references, we should actually be able to zap pagetable reference counts to
>> zero. The only reason we don't do that right now is really because it
>> provides good debugging info to see whether a domain's refcounts have got
>> screwed up. But that would not prevent us doing something faster for NDEBUG
>> builds, at least.
> 
> I still thought it'd be better to not simply zap the counts, but
> incrementally drop them using the proper interface:

Theoretically you can still race PIN_Lx_TABLE hypercalls from other dom0
VCPUs. Obviously that would only happen from a misbehaving dom0 though. I
think this patch is a reasonable stopgap measure.

 -- Keir



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