From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx156.postini.com [74.125.245.156]) by kanga.kvack.org (Postfix) with SMTP id 2975B6B005A for ; Thu, 28 Jun 2012 21:36:59 -0400 (EDT) Message-ID: <4FED06C8.1090003@kernel.org> Date: Fri, 29 Jun 2012 10:37:12 +0900 From: Minchan Kim MIME-Version: 1.0 Subject: Re: [PATCH v2 0/4] make balloon pages movable by compaction References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Rafael Aquini Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Rusty Russell , "Michael S. Tsirkin" , Rik van Riel , Mel Gorman , Andi Kleen , Andrew Morton , Konrad Rzeszutek Wilk 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org