Re: [Xen-devel] [PATCH v2 16/17] libxc/xc_dom_arm: Copy ACPI tables to guest space

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Jul 15, 2016 at 05:39:32PM +0800, Shannon Zhao wrote:
[...]
> > 
> > It would be trivial to have another option in xl.cfg to allow MB
> > granularity. But I don't think that's a good idea. Asking for more
> > memory when you don't really know how much is enough is not very useful.
> > If an admin can know how much is needed, surely the library can be
> > taught to obtain that knowledge, too.
> > 
> > We need to decide which model we should go with. And, if we decide to
> > diverge, document the difference between x86 and ARM model.
> > 
> Hi Wei,
> 
> Do you decide how to add the size of ACPI blob to max_memkb?
> 

AFAICT ARM and x86 maintainers hold different opinions on how memory
should be accounted.

I would like to have a unified memory accounting model. But if we can't
have that at the moment, I'm fine with divergence, but please document
it somewhere (comment near code snippet, in header, or a file under docs
etc). And the amount added to max_memkb needs to be properly calculated,
not some magic number, so that we have a chance in the future to
confidently change how we do thing.


Wei.

> Thanks,
> -- 
> Shannon
> 

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