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

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Date:	Mon, 27 Jul 2015 11:18:43 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
CC:	<xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: 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
case.

David
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