Re: [Xen-devel] Xen + other stuff?

[Bin Ren <br260@xxxxxxxxx>]

On 13 Nov 2003, at 20:26, Keir Fraser wrote:

> With CONFIG_HIGHMEM, Linux no longer needs a permanent mapping for
> every page it owns. Pages in high memory can be temporarily mapped in
> (just as the domain builder does in user space). We'll port this
> config option real soon now, and that will mean that every Xenolinux
> instance could be allocated anything up to 4GB.
>
>  -- Keir

To add, currently there are two modes of High Memory support:

(1)4G: It uses 2 level page table entry + dynamic mapping so that
each (Xeno)Linux instance can use anything up to 4G of physical
memory.

(2)64G: It uses 3 level PAE page table entry + dynamic mapping
so that each (Xeno)Linux instance can use anything up to 64G
of physical memory.


-- Bin



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