On Tue, 20 Jun 2017 23:44:24 -0400
Tony Nelson <tonynel...@georgeanelson.com> wrote:

> It's not allocated memory.  It's a Page Table Entry in the Kernel that
> ensures that no actual memory is mapped there and that the region is
> thus unreadable and unwritable.  This is not unlike a swapped-out
> page, except the Kernel Page Table Entry for such a page says that it
> can be swapped back in and from what (memory-mapped) file.  So all it
> uses is address space and Page Table Entries.

Thanks.  I had wondered if they did that.
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