linux-kernel - Re: Page allocation failures in guest

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Message-Id: <200908121249.51973.rusty@rustcorp.com.au>
Date:	Wed, 12 Aug 2009 12:49:51 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Avi Kivity <avi@...hat.com>
Cc:	Pierre Ossman <drzeus-list@...eus.cx>,
	Minchan Kim <minchan.kim@...il.com>, kvm@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: Page allocation failures in guest

On Tue, 11 Aug 2009 04:22:53 pm Avi Kivity wrote:
> On 08/11/2009 09:32 AM, Pierre Ossman wrote:
> > On Mon, 13 Jul 2009 23:59:52 +0900
> > Minchan Kim<minchan.kim@...il.com>  wrote:
> > Any ideas here? Is the virtio net driver very GFP_ATOMIC happy so it
> > drains all those pages? And why is this triggered by a kernel upgrade
> > in the host?
> >
> > Avi? 
> 
> Rusty?

It's kind of the nature of networking devices :(

I'd say your host now offers GSO features, so the guest allocates big
packets.

> > I doesn't get out of it though, or at least the virtio net driver
> > wedges itself.

There's a fixme to retry when this happens, but this is the first report
I've received.  I'll check it out.

Thanks,
Rusty.
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