linux-kernel - Re: [RFC 3/3] virtio-balloon: add auto-ballooning support

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Message-ID: <20121219093039.51831f6f@doriath.home>
Date:	Wed, 19 Dec 2012 09:30:39 -0200
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	qemu-devel@...gnu.org, riel@...hat.com, aquini@...hat.com,
	mst@...hat.com, amit.shah@...hat.com, agl@...ibm.com,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Mel Gorman <mgorman@...e.de>,
	Glauber Costa <glommer@...allels.com>,
	Michal Hocko <mhocko@...e.cz>, kirill@...temov.name,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 3/3] virtio-balloon: add auto-ballooning support

On Tue, 18 Dec 2012 14:53:30 -0800
Anton Vorontsov <anton.vorontsov@...aro.org> wrote:

> Hello Luiz,
> 
> On Tue, Dec 18, 2012 at 06:16:55PM -0200, Luiz Capitulino wrote:
> > The auto-ballooning feature automatically performs balloon inflate
> > or deflate based on host and guest memory pressure. This can help to
> > avoid swapping or worse in both, host and guest.
> > 
> > Auto-ballooning has a host and a guest part. The host performs
> > automatic inflate by requesting the guest to inflate its balloon
> > when the host is facing memory pressure. The guest performs
> > automatic deflate when it's facing memory pressure itself. It's
> > expected that auto-inflate and auto-deflate will balance each
> > other over time.
> > 
> > This commit implements the host side of auto-ballooning.
> > 
> > To be notified of host memory pressure, this commit makes use of this
> > kernel API proposal being discussed upstream:
> > 
> >  http://marc.info/?l=linux-mm&m=135513372205134&w=2
> 
> Wow, you're fast! And I'm glad that it works for you, so we have two
> full-featured mempressure cgroup users already.

Thanks, although I think we need more testing to be sure this does what
we want. I mean, the basic mechanics does work, but my testing has been
very light so far.

> Even though it is a qemu patch, I think we should Cc linux-mm folks on it,
> just to let them know the great news.

I'll do it next time.
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