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

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Message-ID: <20150731232031.GC3488@olila.local.net-space.pl>
Date:	Sat, 1 Aug 2015 01:20:31 +0200
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	linux-mm@...ck.org, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCHv3 08/10] xen/balloon: use hotplugged pages for foreign
 mappings etc.

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@...rix.com>

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

Daniel
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