From: Rusty Russell <rusty@rustcorp.com.au>
To: "Michael S. Tsirkin" <mst@redhat.com>, Mel Gorman <mel@csn.ul.ie>
Cc: Rafael Aquini <aquini@redhat.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Rik van Riel <riel@redhat.com>, Andi Kleen <andi@firstfloor.org>,
Andrew Morton <akpm@linux-foundation.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCH v7 2/4] virtio_balloon: introduce migration primitives to balloon pages
Date: Tue, 21 Aug 2012 15:01:37 +0930 [thread overview]
Message-ID: <87mx1o3j5y.fsf@rustcorp.com.au> (raw)
In-Reply-To: <20120815112851.GA2707@redhat.com>
On Wed, 15 Aug 2012 14:28:51 +0300, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Wed, Aug 15, 2012 at 12:16:51PM +0100, Mel Gorman wrote:
> > I was thinking of exactly that page->mapping == balloon_mapping check. As I
> > do not know how many active balloon drivers there might be I cannot guess
> > in advance how much of a scalability problem it will be.
>
> Not at all sure multiple drivers are worth supporting, but multiple
> *devices* is I think worth supporting, if for no other reason than that
> they can work today. For that, we need a device pointer which Rafael
> wants to put into the mapping, this means multiple balloon mappings.
Rafael, please make sure that the balloon driver fails on the second and
subsequent balloon devices.
Michael, we only allow multiple balloon devices because it fell out of
the implementation. If it causes us even the slightest issue, we should
not support it. It's not a sensible setup.
Cheers,
Rusty.
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next prev parent reply other threads:[~2012-08-21 23:42 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-10 17:55 [PATCH v7 0/4] make balloon pages movable by compaction Rafael Aquini
2012-08-10 17:55 ` [PATCH v7 1/4] mm: introduce compaction and migration for virtio ballooned pages Rafael Aquini
2012-08-12 23:14 ` Minchan Kim
2012-08-13 8:26 ` Michael S. Tsirkin
2012-08-14 17:44 ` Rafael Aquini
2012-08-14 19:35 ` Michael S. Tsirkin
2012-08-14 19:48 ` Michael S. Tsirkin
2012-08-14 20:03 ` Rafael Aquini
2012-08-14 20:00 ` Rafael Aquini
2012-08-14 20:23 ` Michael S. Tsirkin
2012-08-15 8:52 ` Mel Gorman
2012-08-14 19:52 ` Michael S. Tsirkin
2012-08-10 17:55 ` [PATCH v7 2/4] virtio_balloon: introduce migration primitives to balloon pages Rafael Aquini
2012-08-13 8:41 ` Michael S. Tsirkin
2012-08-13 23:59 ` Rusty Russell
2012-08-14 8:33 ` Michael S. Tsirkin
2012-08-14 18:44 ` Rafael Aquini
2012-08-14 19:31 ` Michael S. Tsirkin
2012-08-15 12:34 ` Rafael Aquini
2012-08-15 14:40 ` Michael S. Tsirkin
2012-08-20 2:29 ` Rusty Russell
2012-08-20 5:12 ` Michael S. Tsirkin
2012-08-15 3:13 ` Rusty Russell
2012-08-14 18:22 ` Rafael Aquini
2012-08-14 19:51 ` Michael S. Tsirkin
2012-08-14 19:59 ` Michael S. Tsirkin
2012-08-14 20:08 ` Rafael Aquini
2012-08-14 20:24 ` Michael S. Tsirkin
2012-08-14 20:29 ` Rafael Aquini
2012-08-14 20:49 ` Michael S. Tsirkin
2012-08-14 20:54 ` Michael S. Tsirkin
2012-08-14 20:56 ` Rik van Riel
2012-08-14 21:38 ` Michael S. Tsirkin
2012-08-15 15:30 ` Rik van Riel
2012-08-14 21:34 ` Rafael Aquini
2012-08-14 22:48 ` Michael S. Tsirkin
2012-08-14 20:11 ` Rafael Aquini
2012-08-14 20:31 ` Michael S. Tsirkin
2012-08-15 9:05 ` Mel Gorman
2012-08-15 9:25 ` Michael S. Tsirkin
2012-08-15 9:48 ` Mel Gorman
2012-08-15 10:01 ` Michael S. Tsirkin
2012-08-15 11:16 ` Mel Gorman
2012-08-15 11:28 ` Michael S. Tsirkin
2012-08-21 5:31 ` Rusty Russell [this message]
2012-08-22 0:37 ` Michael S. Tsirkin
2012-08-10 17:55 ` [PATCH v7 3/4] mm: introduce putback_movable_pages() Rafael Aquini
2012-08-12 23:26 ` Minchan Kim
2012-08-10 17:55 ` [PATCH v7 4/4] mm: add vm event counters for balloon pages compaction Rafael Aquini
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