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[Xen-devel] Re: scrubbing pages on vm pause
| To: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: scrubbing pages on vm pause |
| From: | Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx> |
| Date: | Tue, 25 May 2010 16:24:34 +0200 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 25 May 2010 07:23:41 -0700 |
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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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