Re: [Xen-devel] A question about CONFIG_SMP

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 23 Feb 2006, at 08:51, Tian, Kevin wrote:

> Just a curious question, does anyone still care xen/UP? If yes, current
> xen-unstable.hg
> failed to build quickly after undef CONFIG_SMP since many structures
> include types
> defined only when CONFIG_SMP is on.
>
> Just realize this issue when cleanup some IA64 code recently, where
> CONFIG_SMP is still unstable and thus UP only.
>
> Is there any benefit to have xen/UP? Reducing image size is the
> immediate answer in my head...
It's not supported for xen/x86 at least. Dynamically adding LOCK 
prefixes if the system turns out to be multiprocessor is the only 
optimisation I think would be worthwhile. But really 
multi-processor/core/thread is what we care about.
 -- Keir


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