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Re: [Xen-devel] Re: non-contiguous allocations
| To: | Jan Beulich <JBeulich@xxxxxxxxxx>, Olaf Hering <olaf@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Re: non-contiguous allocations |
| From: | Keir Fraser <keir@xxxxxxx> |
| Date: | Mon, 09 May 2011 09:34:37 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 09 May 2011 01:35:14 -0700 |
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| Thread-topic: | [Xen-devel] Re: non-contiguous allocations |
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On 09/05/2011 09:30, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: >> Yes, sticking with alloc_xenheap_pages() is good. > > It really depends on whether you expect to get memory that has > (even on 32-bit) a virtual mapping, or you want to map it at an > arbitrary virtual address after wards. alloc_xenheap_pages() gives > you mapped memory (and the amount you can get is rather limited > on 32-bit), while alloc_domheap_pages(NULL, ...) gives you > memory that has a mapping only on 64-bit (and, once we'll find it > necessary to support machines with more than 5Tb, even that > may not hold anymore) but it equally not associated with any > domain. We have a mechanism for sharing xenheap pages with a guest, which xentrace is already using. Doing the same with anonymous domheap pages would be extra hassle. The limitation of xenheap on x86_32 is uninteresting to me, especially when we're talking about a niche developer feature like xentrace. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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