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Re: [Xen-devel] [PATCHv2 08/10] xen/balloon: use hotplugged pages for foreign mappings etc.

On 24/07/15 19:55, Konrad Rzeszutek Wilk wrote:
> On Fri, Jul 24, 2015 at 12:47:46PM +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.
>> If userspace is lacking a udev rule (or similar) to online hotplugged
> Is that udev rule already in distros?

Not all, which makes me think that this behaviour should be enabled by
userspace (via a module parameter).  This would also allow me to drop
the timeout and fallback path which I put in to handle the no udev rule


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