Re: [Xen-devel] Proposed XENMEM_claim_pages hypercall: Analysis of problem and alternate solutions

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Jan 17, 2013 at 03:16:31PM +0000, Tim Deegan wrote:
> At 14:08 -0500 on 11 Jan (1357913294), Konrad Rzeszutek Wilk wrote:
> > But the solution to the hypercall failing are multiple - one is to 
> > try to "squeeze" all the guests to make space
> 
> AFAICT if the toolstack can squeeze guests up to make room then the
> reservation hypercall isn't necessary -- just use the squeezing
> mechanism to make sure that running VMs don't use up the memory you want
> for building new ones.

We might want to not do that until we have run out of options (this would
be a toolstack option to select the right choice). The other option is
to just launch the guest on another node.

The reasoning for not wanting to squeeze the guests as it might cause the
guest to fall in the OOM camp. 



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