[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] free_domheap_pages() leaking xenheap pages?
On 23/1/07 16:25, "Daniel Stodden" <stodden@xxxxxxxxxx> wrote: > the page range remains unlisted upon return, and if there's any later > point in the domain life cycle where these pages would ever return to > the xen heap, i'm unable to find it. There are very few xenheap pages that are ever shared with guests. These are shared_info and grant-table pages. We don't want the pages to be completely freed until the hypervisor is done with them which is not until domain_destruct(). But Xen itself cannot keep an explicit reference on the pages since that would stop the domain reference count ever falling to zero, which would prevent domain_destruct() from ever being called! So Xen does not increment the reference count and instead takes responsibility for 'manually' freeing the pages in domain_destruct() (at which point we know that there are no other references to those pages). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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