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Re: [Xen-devel] Meaning of PG_foreign

  • To: Jacob Gorm Hansen <jacobg@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Fri, 06 Oct 2006 11:24:42 +0100
  • Delivery-date: Fri, 06 Oct 2006 03:25:09 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcbpMaLD4UoPUFUkEduvTAAX8io7RQ==
  • Thread-topic: [Xen-devel] Meaning of PG_foreign

On 6/10/06 10:54, "Jacob Gorm Hansen" <jacobg@xxxxxxx> wrote:

> can I count on all pages in a domU that are changed by Xen, backend
> drivers, or writable pagetable magic, being marked as PG_foreign?

I'm not sure what you mean by 'changed'. But I expect you misunderstand the
meaning of PG_foreign anyway. What it means is 'foreign' from the
point-of-view of Linux's buddy allocator -- i.e., it is a page that actually
comes from a different allocator, which is wanting to hook off of
free_pages(). It doesn't (necessarily) mean that the page is actually from a
foreign virtual machine.

 -- Keir

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