Re: [Xen-devel] Xen 4.9 + kernel 4.13rc2 -- ballooning regression? reappearance of "Over-allocation for domain 1" errors

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 08/02/2017 08:01 AM, Juergen Gross wrote:
> On 01/08/17 16:28, PGNet Dev wrote:
>> On 7/28/17 9:02 AM, PGNet Dev wrote:
>>> On 7/27/17 11:23 PM, Juergen Gross wrote:
>>>> Can you please post the domain's config file used to create the domain
>>>> and the kernel config?
>>> Sure.
>>>
>>>    https://pastebin.com/M6cr2pX7
>>>
>> Any add'l info needed?
> No, I don't think so.
>
> IMO the problem is related to the fact that the balloon driver tries to
> use then kernel's view of how much memory it is owning and setting this
> number in relation to Xen's view how much memory it should try to have.
>
> Maybe before adding memory from Xen the kernel should ask the hypervisor
> how much memory it has already from Xen's point of view and how much it
> is allowed to have. This will avoid the messages you have seen as long
> as there are no interfering actions from Xen (e.g. lowering the maximum
> reservation) while the kernel is trying to balloon up.

Could this be caused by your recent ballooning patch
(96edd61dcf44362d3ef0bed1a5361e0ac7886a63)?

-boris

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