linux-kernel - Re: [PATCH 1/2] mm: Export vm_committed

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Message-ID: <20121008133539.GA15490@kroah.com>
Date:	Mon, 8 Oct 2012 06:35:39 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	"olaf@...fle.de" <olaf@...fle.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] mm: Export vm_committed_as

On Mon, Oct 08, 2012 at 03:35:50AM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Greg KH [mailto:gregkh@...uxfoundation.org]
> > Sent: Sunday, October 07, 2012 8:44 PM
> > To: KY Srinivasan
> > Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org; olaf@...fle.de;
> > apw@...onical.com; akpm@...ux-foundation.org; andi@...stfloor.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.

thanks,

greg k-h
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