Re: [Xen-devel] [PATCHv3 08/10] xen/balloon: use hotplugged pages for foreign mappings etc.

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Thu, Jul 30, 2015 at 06:03:10PM +0100, David Vrabel wrote:
> alloc_xenballooned_pages() is used to get ballooned pages to back
> foreign mappings etc.  Instead of having to balloon out real pages,
> use (if supported) hotplugged memory.
>
> This makes more memory available to the guest and reduces
> fragmentation in the p2m.
>
> This is only enabled if the xen.balloon.hotplug_unpopulated sysctl is
> set to 1.  This sysctl defaults to 0 in case the udev rules to
> automatically online hotplugged memory do not exist.
>
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Reviewed-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>

Daniel

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