Re: [Xen-devel] address space reorganization

[Rik van Riel <riel@xxxxxxxxxx>]

On Thu, 14 Apr 2005, Kip Macy wrote:

> > People whose applications need SSE2 will install CPUs that
> > have those instructions.
> > 
> One would hope, but just because a customer has lots of money to spend
> on hardware doesn't mean that he is rowing with both oars. This is a
> supportability issue. The xen{source} folks would do themselves a
> favor by trapping a guest's use of unsupported instructions and
> logging it. That would make it easy enough to track down if a
> customer's apps stop working when using migration.

Good idea, trapping unsupported instructions and printing out
the category the instruction belongs to (eg. SSE2) will make
things a lot easier to track.  I like this idea a lot...

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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