linux-kernel - Re: [PATCH 1/4] mm: introduce compaction and migration for virtio ballooned pages

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Message-ID: <20120626132055.GI8103@csn.ul.ie>
Date:	Tue, 26 Jun 2012 14:20:55 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Rik van Riel <riel@...hat.com>
Cc:	Rafael Aquini <aquini@...hat.com>, linux-mm@...ck.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 1/4] mm: introduce compaction and migration for virtio
 ballooned pages

On Tue, Jun 26, 2012 at 09:17:43AM -0400, Rik van Riel wrote:
> On 06/25/2012 07:25 PM, Rafael Aquini wrote:
> >This patch introduces helper functions that teach compaction and migration bits
> >how to cope with pages which are part of a guest memory balloon, in order to
> >make them movable by memory compaction procedures.
> >
> >Signed-off-by: Rafael Aquini<aquini@...hat.com>
> 
> The function fill_balloon in drivers/virtio/virtio_balloon.c
> should probably add __GFP_MOVABLE to the gfp mask for alloc_pages,
> to keep the pageblock where balloon pages are allocated marked
> as movable.
> 

You're right, but patch 3 is already doing that at the same time the
migration primitives are introduced. It does mean the full series has to
be applied to do anything but I think it's bisect safe.

-- 
Mel Gorman
SUSE Labs
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