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

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Date:	Wed, 10 Oct 2012 03:18:22 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	"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>
Subject: RE: [PATCH 1/2] mm: Export vm_committed_as



> -----Original Message-----
> From: Andrew Morton [mailto:akpm@...ux-foundation.org]
> Sent: Tuesday, October 09, 2012 9:17 PM
> To: KY Srinivasan
> Cc: Greg KH; olaf@...fle.de; linux-kernel@...r.kernel.org; andi@...stfloor.org;
> apw@...onical.com; devel@...uxdriverproject.org
> Subject: Re: [PATCH 1/2] mm: Export vm_committed_as
> 
> On Wed, 10 Oct 2012 00:11:28 +0000 KY Srinivasan <kys@...rosoft.com> wrote:
> 
> >
> >
> > > -----Original Message-----
> > > From: Andrew Morton [mailto:akpm@...ux-foundation.org]
> > > Sent: Tuesday, October 09, 2012 3:48 PM
> > > To: Greg KH
> > > Cc: KY Srinivasan; olaf@...fle.de; linux-kernel@...r.kernel.org;
> > > andi@...stfloor.org; apw@...onical.com; devel@...uxdriverproject.org
> > > Subject: Re: [PATCH 1/2] mm: Export vm_committed_as
> > >
> > > On Mon, 8 Oct 2012 06:35:39 -0700
> > > Greg KH <gregkh@...uxfoundation.org> wrote:
> > >
> > > > 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.
> > >
> > > Well I guess it won't kill us.
> >
> >
> > Thanks.
> >
> 
> The other part of my email seems to have vanished.  Which makes me sad,
> because I was rather interested in the answer.

Andrew,

I am truly sorry for not answering your question.  To be honest, I was not quite sure
what the issue was, given from what I can tell, the vm_committed_as is maintained
globally and would represent the overall memory commitment of the system. Is this not the
case. 

Regards,

K. Y 


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