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Re: [Xen-devel] Baffled by multipage_allocation_permitted()
| To: | Dave McCracken <dcm@xxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Baffled by multipage_allocation_permitted() |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 16 Jun 2009 14:21:00 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Tue, 16 Jun 2009 06:21:41 -0700 |
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| In-reply-to: | <200906160810.29184.dcm@xxxxxxxx> |
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| Thread-index: | Acnug+a0u7bHct0IQJ6D+PeSS5IG1wAAWODk |
| Thread-topic: | [Xen-devel] Baffled by multipage_allocation_permitted() |
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On 16/06/2009 14:10, "Dave McCracken" <dcm@xxxxxxxx> wrote: > Thanks for the change. That resolves my problem. > > Out of curiosity, why is it necessary to restrict the size of multipage > allocations at all? I'd think the memory size limits would adequately protect > against any guest going wild with it. What harm could come from, for example, > a guest asking for a 16M contiguous page? I don't know of any current need > for such a thing. I'm just wondering why we restrict it. Such regions could be a precious resource when driving some hardware devices which communicate via large contiguous memory areas. As I said, we haven't thought about it too hard, so it may indeed be sensible to relax this further in future. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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