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

[Minchan Kim <minchan@kernel.org>]

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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