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Re: [Xen-devel] [PATCH V3 1/1] libxl: set stub domain size based on VRAM size

On Jul 14, 2015 4:51 AM, "George Dunlap" <George.Dunlap@xxxxxxxxxxxxx> wrote:
> On Sat, Jul 11, 2015 at 10:30 PM, Eric Shelton <eshelton@xxxxxxxxx> wrote:
> > Allocate additional memory to the stub domain for qemu-traditional if
> > more than 4 MB is assigned to the video adapter to avoid out of memory
> > condition for QEMU.
> >
> > Signed-off-by: Eric Shelton <eshelton@xxxxxxxxx>
> This seems like a good fix for now, thanks.
> But (just speaking to people in general) it does make it even harder
> to predict exactly how much host memory a VM is going to end up
> needing to start, which is something a lot of people complain about.
> I'm beginning to think that one feature we should try to look at is a
> way for the admin to specify, "Max host memory used", from which
> shadow/p2m/device memory/stubdomain can all be "allocated".

Just curious: what happens when all of that memory has been "allocated," yet there is still plenty of memory overall? Would you not be able to spin up a domain despite there actually being plenty of memory to do so?


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