Re: more than 3 GB in userspace (4G/4G patch?) for 2.6.16

[Dave Hansen]

On Tue, 2006-06-13 at 14:30 -0700, H. Peter Anvin wrote:
> > A 0.5/3.5 GB split appears to be what I need for my application.
> 
> That is incompatible with PAE.  The way PAE works, the split has to be
> an even number of gigabytes. 

Well, there have been ancient patches available in the past.  People pop
up now and again and ask for them.  This is _horribly_ out of date, but
it at least indicates that this is possible.

The basic idea is that you never share a kernel PMD page.  Each process
needs to allocate four of its own:

http://lkml.org/lkml/2003/5/9/138

-- Dave

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