linux-kernel - Re: [PATCH v2 0/4] make balloon pages movable by compaction

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Date:	Fri, 29 Jun 2012 10:37:12 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Rafael Aquini <aquini@...hat.com>
CC:	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>,
	Rik van Riel <riel@...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>
Subject: Re: [PATCH v2 0/4] make balloon pages movable by compaction

Hi Rafael,

On 06/29/2012 06:49 AM, Rafael Aquini wrote:

> This patchset follows the main idea discussed at 2012 LSFMMS section:
> "Ballooning for transparent huge pages" -- http://lwn.net/Articles/490114/

Could you summarize the problem, solution instead of link URL in cover-letter?
IIUC, the problem is that it is hard to get contiguous memory in guest-side 
after ballooning happens because guest-side memory could be very fragmented
by ballooned page. It makes THP page allocation of guest-side very poor success ratio.

The solution is that when memory ballooning happens, we allocates ballooned page
as a movable page in guest-side because they can be migrated easily so compaction of
guest-side could put together them into either side so that we can get contiguous memory.
For it, compaction should be aware of ballooned page.

Right?

-- 
Kind regards,
Minchan Kim
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