How should anaconda check for PAE? (was Re: arch fun.)

[Chuck Ebbert]

On Tue, 24 Feb 2009 15:38:42 -0800 (PST)
Roland McGrath <roland at redhat.com> wrote:

> > If we have NX (which anything made in the last few years will)
> > it's a performance win to use the hardware NX instead of the
> > segment limit hack we implemented in execshield.
> 
> It's more than performance.  The segment limit hack is a hack, and does not
> actually do full enforcement in all cases (though we have already bent over
> backward to ensure that these cases do not come up by default).  
> Hardware NX is 100% reliable.
> 

We also need to look for lm to see if we can install a 64-bit kernel.

So something like:

if (lm)
	install 64-bit
else
if (!pae) || (!nx && memory < 4GB)
	install i586
else
	install PAE