[Xen-devel] Re: scrubbing pages on vm pause

[Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>]

On 05/25/2010 04:19 PM, Keir Fraser wrote:
> On 25/05/2010 15:19, "Joanna Rutkowska" <joanna@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:
> 
>> Let's consider this scenario:
>>
>> xm save domain1
>>
>> xm create domain2
>>
>> Can the domain2 get *unscrubbed* pages that were previously used by
>> domain1, but were not scrubbed properly by domain1?
> 
> Generally speaking a domain loses pages to the free pool in only two ways:
> via a decrease_reservation hypercall, and via domain destruction. In the
> former case the domain itself is responsible for first scrubbing the page.
> In the latter case Xen is responsible. With both avenues covered, domain2
> cannot get unscrubbed pages from domain1.
> 
Makes sense.

Thanks,
j.

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