linux-kernel - Re: [PATCH 3.4 82/88] xen/setup: Populate freed MFNs from non-RAM E820 entries and gaps to E820 RAM

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Message-ID: <20140610184537.GA15811@kroah.com>
Date:	Tue, 10 Jun 2014 11:45:37 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Daniel Kiper <daniel.kiper@...cle.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 3.4 82/88] xen/setup: Populate freed MFNs from non-RAM
 E820 entries and gaps to E820 RAM

On Tue, Jun 10, 2014 at 02:18:16PM +0100, David Vrabel wrote:
> On 10/06/14 10:30, Daniel Kiper wrote:
> > On Tue, Jun 10, 2014 at 10:07:27AM +0100, David Vrabel wrote:
> >> On 10/06/14 01:25, Greg Kroah-Hartman wrote:
> >>> 3.4-stable review patch.  If anyone has any objections, please let me know.
> >>
> >> This is a new feature and not a bug fix.  I don't think it (and patches
> >> 83-85) are suitable for stable.
> > 
> > IIRC, this is the main patch fixing dom0 memory looses.
> > Earlier patches are preparatory stuff and later ones are
> > fixing bugs introduced by this patch and others. Konrad and I
> > picked only minimal set of patches to fix that issue in 3.4.
> 
> This is not a bug fix.  dom0 was previously required to use the balloon
> driver to recover memory freed during setup.  This was annoying but not
> a bug.
> 
> This patches makes significant changes to how much memory dom0 ends up.
>  Depending on hardware, the dom0_mem option, and the (non)use of the
> balloon driver  applying this could result is between 1 - 3 GB of
> additional memory allocated to dom0.  This could result in there being
> insufficient host memory available to start a VM.
> 
> Please do not add to 3.4.y.

Ok, fun stuff, I have two maintainers of the same subsystem arguing over
if the patches should be sent to the stable tree.

So, what do I do, any ideas?  Flip a coin?  Ask the third maintainer
(Boris) to break the tie?

Konrad and Daniel, are distros using this patchset in 3.4 releases?
What made you want to create them in the first place?  Who was
complaining that warranted this work being done?

thanks,

greg k-h
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