linux-kernel - Re: [PATCH] Add a page cache-backed balloon device driver.

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Message-ID: <504E2B98.3010007@redhat.com>
Date:	Mon, 10 Sep 2012 14:04:08 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mike Waychison <mikew@...gle.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Frank Swiderski <fes@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrea Arcangeli <aarcange@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org
Subject: Re: [PATCH] Add a page cache-backed balloon device driver.

On 09/10/2012 01:37 PM, Mike Waychison wrote:
> On Mon, Sep 10, 2012 at 5:05 AM, Michael S. Tsirkin <mst@...hat.com> wrote:

>> Also can you pls answer Avi's question?
>> How is overcommit managed?
>
> Overcommit in our deployments is managed using memory cgroups on the
> host.  This allows us to have very directed policies as to how
> competing VMs on a host may overcommit.

How do your memory cgroups lead to guests inflating their balloons?

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