Re: [Xen-devel] [PATCH] Unallocate function for memory regions created by allocate_empty_lowmem_region

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 Aug 2005, at 11:09, Ross C Mcilroy wrote:

> Hi,
>
>  This patch provides a function which allows a domain to reclaim 
> memory used by the allocate_empty_lowmem_region.  It should allow a 
> module to reclaim any memory which was released to Xen for foreign 
> grant table access.
This could be implemented much more simply. Add a balloon interface 
function balloon_dealloc_empty_page_range(struct page *page, long 
nr_pfns).
This function can simply iterate over the page range, 
balloon_append()ing each page. Then kick the balloon worker thread and 
you're done!
Call that balloon function direct from your driver(s) (ie., don't 
bother defining a wrapper function in mm/hypervsior.c). 
alloc_lowmem_region will probably also get moved to the balloon driver 
at some point.
 -- Keir


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