Re: [Xen-devel] How to allocate a memory page in virtual memory, but does not use physical memory?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 11/8/06 2:27 am, "Lily Huang" <ushuanglily@xxxxxxxxx> wrote:

> I am trying to allocate pages in a domU and map certain pages from Dom0. Since the pages are already in dom0's physical memory, it is desired that domu only allocate a "virtual space" for remapping, but does not need to use physical memory allocated to domu. I tried function balloon_alloc_empty_page_range() and alloc_pages(). But both of them seem to use physical memory once allocation succeed. 


Balloon_empty_alloc_page_range() does what you want. It frees up the RAM which was previously mapped in the virtual address range that it returns to the caller.

 -- Keir



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