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Re: [Xen-devel] Re: non-contiguous allocations

  • To: Olaf Hering <olaf@xxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxx>
  • Date: Sat, 07 May 2011 17:31:23 +0100
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Sat, 07 May 2011 09:32:26 -0700
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  • Thread-topic: [Xen-devel] Re: non-contiguous allocations

On 07/05/2011 09:39, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

> On Fri, May 06, Keir Fraser wrote:
>> On 06/05/2011 19:12, "Olaf Hering" <olaf@xxxxxxxxx> wrote:
>>> Is there a way to allocate more than 128mb with repeated calls to
>>> alloc_xenheap_page()?
>> Yes it should just work. Are you sure you actually have more than 128MB
>> available (not all allocated to dom0 for example)?
> Thanks Keir. xm mem-set 0 1024 did the trick.
> I was under the impression dom0 would automatically get ballooned down
> to make room for the allocation requests.

Only when creating new domains in xend, then xend will balloon down dom0. So
no, not in this case: we can hardly go run xend while we're in hypervisor
context. ;-)

This kind of thing is why we normally run dom0 with 'just enough' memory and
don't use auto ballooning.

 -- Keir

> Olaf

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