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


  • To: Devel Xen <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
  • From: Bin Ren <br260@xxxxxxxxx>
  • Date: Thu, 13 Nov 2003 21:02:52 +0000
  • Delivery-date: Thu, 13 Nov 2003 21:03:54 +0000
  • List-id: List for Xen developers <xen-devel.lists.sourceforge.net>

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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