Re: [Xen-devel] [PATCH 4 of 4] xen, pod: Try to reclaim superpages when ballooning down

[Tim Deegan <tim@xxxxxxx>]

At 17:57 +0100 on 27 Jun (1340819851), George Dunlap wrote:
> xen,pod: Try to reclaim superpages when ballooning down
> 
> Windows balloon drivers can typically only get 4k pages from the kernel,
> and so hand them back at that level.  Try to regain superpages by checking
> the superpage frame that the 4k page is in to see if we can reclaim the whole
> thing for the PoD cache.
> 
> This also modifies p2m_pod_zero_check_superpage() to return SUPERPAGE_PAGES on
> success.
> 
> v2:
>  - Rewritten to simply to the check as in demand-fault case, without needing
>    to know that the p2m entry is a superpage.
>  - Also, took out the re-writing of the reclaim loop, leaving it optimized for
>    4k pages (by far the most common case), and simplifying the patch.
> 

Acked-by: Tim Deegan <tim@xxxxxxx>

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