Re: A comment about changing kernels

[Jonathan S. Shapiro]

On Mon, 2005-10-31 at 01:05 +0100, Marcus Brinkmann wrote:
> At Fri, 28 Oct 2005 20:34:09 +0200,
> Bernhard Kauer <address@hidden> wrote:
> > Now to copy(): I know no functional argument to introduce a copy() into
> > L4.sec. The only argument is performance. Because mapping (or copy) a
> > return endpoint with every RPC will be too expensive,
> 
> Ask Espen about "map-once" mappings to learn how to allow to optimize
> reply capabilities.

No no. Map once mappings are another thing entirely. They decidedly do
NOT provide any optimization of reply capabilities. What they *do*
accomplish is to utterly break the notion of capability transfer in the
same way that the mach reply port does.


shap