Re: [Xen-devel] scrubbing free'd pages

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 25/05/2010 14:33, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

>> Other memory pages the domain freeing the
>> pages must scrub them itself before freeing them back to Xen.
> 
> Is that true for a HVM domain making a decrease_reservation hypercall?
> If so I should modify my code accordingly...

Yes you should.

> it also means I need to
> know if the page I'm decreasing is an unpopulated PoD page or not too.

Certainly you could avoid it in that case. Actually I think the PoD code can
detect and reclaim allocated-but-zeroed pages however. But not sure if you
really have to rely on that or not.

 -- Keir



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