linux-kernel - Re: [kvm-devel] [RFC] Notifier for Externally Mapped Memory (EMM)

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Date:	Wed, 05 Mar 2008 12:02:57 +0200
From:	Dor Laor <dor.laor@...il.com>
To:	Robin Holt <holt@....com>
Cc:	Avi Kivity <avi@...ranet.com>, Nick Piggin <npiggin@...e.de>,
	Steve Wise <swise@...ngridcomputing.com>,
	Andrea Arcangeli <andrea@...ranet.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, daniel.blueman@...drics.com,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org,
	Christoph Lameter <clameter@....com>
Subject: Re: [kvm-devel] [RFC] Notifier for Externally Mapped Memory (EMM)


On Wed, 2008-03-05 at 03:47 -0600, Robin Holt wrote:
> On Wed, Mar 05, 2008 at 07:09:55AM +0200, Avi Kivity wrote:
> > Isn't that out of the question for .25?
> 
> I keep hearing this mantra.  What is so compelling about the .25
> release?  When seems to be more important than what.  While I understand
> product release cycles, etc. and can certainly agree with them. I would
> like to know with what I am being asked to agree.
> 

The main reason is that several kvm exciting features are dependent on
mmu notifiers:
- It enables full guest swapping (as opposed to partial today)
- It enables memory ballooning
- It enables running Izik Eidus's Kernel Shared Pages module that unify
  guest pages together.

The patchset is kernel-internal, stable and reviewed. Even if the
interface will be changed in .26 it won't have noticeable effect.

So since its stable, internal, reviewed, needed to enable important kvm
features we like to see it in for .25.

Regards,
Dor

> That said, I agree we should probably finish getting the comments on
> Andrea's most recent patch, if any, cleared up and put that one in.
> 
> Robin
> 
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