Date: Tue, 9 Oct 2012 12:47:55 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: KY Srinivasan <kys@microsoft.com>, "olaf@aepfle.de" <olaf@aepfle.de>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "andi@firstfloor.org" <andi@firstfloor.org>,
        "apw@canonical.com" <apw@canonical.com>,
        "devel@linuxdriverproject.org" <devel@linuxdriverproject.org>
Subject: Re: [PATCH 1/2] mm: Export vm_committed_as
Message-Id: <20121009124755.ce1087b4.akpm@linux-foundation.org>
In-Reply-To: <20121008133539.GA15490@kroah.com>
References: <1349654347-18337-1-git-send-email-kys@microsoft.com>
	<1349654386-18378-1-git-send-email-kys@microsoft.com>
	<20121008004358.GA12342@kroah.com>
	<426367E2313C2449837CD2DE46E7EAF930A1FB31@SN2PRD0310MB382.namprd03.prod.outlook.com>
	<20121008133539.GA15490@kroah.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1797
Lines: 41

On Mon, 8 Oct 2012 06:35:39 -0700
Greg KH <gregkh@linuxfoundation.org> wrote:

> On Mon, Oct 08, 2012 at 03:35:50AM +0000, KY Srinivasan wrote:
> > 
> > 
> > > -----Original Message-----
> > > From: Greg KH [mailto:gregkh@linuxfoundation.org]
> > > Sent: Sunday, October 07, 2012 8:44 PM
> > > To: KY Srinivasan
> > > Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> > > apw@canonical.com; akpm@linux-foundation.org; andi@firstfloor.org
> > > Subject: Re: [PATCH 1/2] mm: Export vm_committed_as
> > > 
> > > On Sun, Oct 07, 2012 at 04:59:45PM -0700, K. Y. Srinivasan wrote:
> > > > The policy engine on the host expects the guest to report the
> > > > committed_as. Since this variable is not exported,
> > > > export this symbol.
> > > 
> > > Why are these symbols not needed by either Xen or KVM or vmware, which
> > > I think all support the same thing, right?
> > 
> > The basic balloon driver does not need this symbol since the basic balloon driver
> > is not automatically driven by the host. On the Windows host we have a policy engine that
> > drives the balloon driver based on both guest level memory pressure that the guest
> > reports as well as other system level metrics the host maintains. We need this symbol to
> > drive the policy engine on the host.
> 
> Ok, but you're going to have to get the -mm developers to agree that
> this is ok before I can accept it.

Well I guess it won't kill us.

I do wonder what relevance vm_committed_as has to processes which are
running within a memcg container?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/