linux-kernel - Re: [PATCH v4 1/3] mm: introduce compaction and migration for virtio ballooned pages

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Message-ID: <20120803111309.GA1848@t510.redhat.com>
Date:	Fri, 3 Aug 2012 08:13:09 -0300
From:	Rafael Aquini <aquini@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Rafael Aquini <aquini@...ux.com>
Subject: Re: [PATCH v4 1/3] mm: introduce compaction and migration for virtio
 ballooned pages

On Wed, Aug 01, 2012 at 04:53:47PM -0400, Rik van Riel wrote:
> On 07/23/2012 02:19 PM, Rafael Aquini wrote:
> 
> >In a glance, I believe this whole dance you're suggesting might just be too much
> >of an overcomplication, and the best approach would be simply teaching the
> >hotplug bits about the ballooned corner case just like it's being done to
> >compaction/migration. However, I'll look at it carefully before making any other
> >adjustments/propositions over here.
> 
> Compaction and hotplug do essentially the same thing
> here: "collect all the movable pages from a page block,
> and move them elsewhere".
> 
> Whether or not it is easier for them to share code, or
> to duplicate a few lines of code, is something that can
> be looked into later.

I'm 100% in agreement with your thoughts here.

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