[XenPPC] Re: [Xen-devel] What actually destroys a domain?
On 12/9/06 14:05, Jimi Xenidis [EMAIL PROTECTED] wrote: Xenconsoled's mapping of the console page should keep the domain alive. hmm, I'm having trouble associating the mapping and a refcount of some sort somewhere, any pointers? See share_xen_page_with_guest() in arch/x86/mm.c. The refcnt is dropped when xenheap_pages field reduces to zero in common/page_alloc.c:free_domheap_pages(). -- Keir ___ Xen-ppc-devel mailing list Xen-ppc-devel@lists.xensource.com http://lists.xensource.com/xen-ppc-devel
[XenPPC] Re: [Xen-devel] What actually destroys a domain?
On Sep 13, 2006, at 5:23 AM, Keir Fraser wrote: On 12/9/06 14:05, Jimi Xenidis [EMAIL PROTECTED] wrote: Xenconsoled's mapping of the console page should keep the domain alive. hmm, I'm having trouble associating the mapping and a refcount of some sort somewhere, any pointers? See share_xen_page_with_guest() in arch/x86/mm.c. The refcnt is dropped when xenheap_pages field reduces to zero in common/page_alloc.c:free_domheap_pages(). Hmm.. but the console page is a domain page, no? After looking at more code I convinced myself that a page not owned by the domain but owned by another is foreign. -JX ___ Xen-ppc-devel mailing list Xen-ppc-devel@lists.xensource.com http://lists.xensource.com/xen-ppc-devel
[XenPPC] Re: [Xen-devel] What actually destroys a domain?
On Sep 13, 2006, at 8:15 AM, Keir Fraser wrote: On 13/9/06 10:23, Keir Fraser [EMAIL PROTECTED] wrote: Xenconsoled's mapping of the console page should keep the domain alive. hmm, I'm having trouble associating the mapping and a refcount of some sort somewhere, any pointers? See share_xen_page_with_guest() in arch/x86/mm.c. The refcnt is dropped when xenheap_pages field reduces to zero in common/page_alloc.c:free_domheap_pages(). Sorry, I'm talking rubbish here. As you say, the relevant code is actually in the foreign mapping paths (e.g., in arch/x86/mm.c). Those paths do a get_page() on the foreign page. This stops it being removed from the domU page list. A non-empty page list holds a reference on the domU. So the domU will not die until that foreign mapping is destroyed. Whew! -JX ___ Xen-ppc-devel mailing list Xen-ppc-devel@lists.xensource.com http://lists.xensource.com/xen-ppc-devel
[XenPPC] Re: [Xen-devel] What actually destroys a domain?
On Tue, 2006-09-12 at 11:16 -0400, Jimi Xenidis wrote: On Sep 12, 2006, at 9:05 AM, Jimi Xenidis wrote: On Sep 12, 2006, at 3:38 AM, Keir Fraser wrote: Xenconsoled's mapping of the console page should keep the domain alive. hmm, I'm having trouble associating the mapping and a refcount of some sort somewhere, any pointers? I see it now, its in the foreign domain logic. I thought it would be a page count not a dom count. Actually, why *isn't* it increasing the page reference count? That would keep the page attached to the domain, which would mean d-tot_pages would stay non-zero, so that would indicate that the domain isn't ready to be killed yet... -- Hollis Blanchard IBM Linux Technology Center ___ Xen-ppc-devel mailing list Xen-ppc-devel@lists.xensource.com http://lists.xensource.com/xen-ppc-devel
