linux-kernel - Re: [Xen-devel] [PATCH 6/7] xen/setup: Make dom0_mem=XGB behavior be similar to classic Xen kernels.

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Message-ID: <20120409213329.GC12783@phenom.dumpdata.com>
Date:	Mon, 9 Apr 2012 17:33:29 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <jbeulich@...e.com>
Cc:	xen-devel@...ts.xensource.com, david.vrabel@...rix.com,
	linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH 6/7] xen/setup: Make dom0_mem=XGB behavior be
 similar to classic Xen kernels.

On Mon, Apr 09, 2012 at 05:39:35PM +0100, Jan Beulich wrote:
> >>> Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> 04/06/12 11:06 PM >>>
> >On Tue, Apr 03, 2012 at 10:46:41AM +0100, Jan Beulich wrote:
> >> >>> On 03.04.12 at 10:58, David Vrabel <david.vrabel@...rix.com> wrote:
> >> > With your new behaviour it will no longer possible to specify an
> >> > unlimited balloon but a limited number of initial pages.  This is
> >> > behaviour that Jan said he used.
> >> 
> >> An unlimited balloon was never possible afaict (as that would have
> >> implied setting up an "infinite" number of struct page instances at
> >> boot time.
> >> 
> >> What I'm using is "dom0_mem=-<num>M" together with the kernel
> >> option "mem=<num>G", such that max-balloon > initial alloc (usually
> >> I set max-balloon to approximately the amount of memory in the
> >> system, so the upper limit is "infinite" in the sense that I can't go
> >> higher anyway, but it's not truly infinity).
> >
> >Couldn't you do the same thing with 'dom0_mem=X,max:Y'
> 
> That would be possible (albeit not exactly identical in behavior). But my
> main point in the discussion was to not modify existing behavior without
> actual need to (including the desire to not have to modify dozens of
> command lines).

Right. I don't want to modify the hypervisor - my goal is to bring the pvops
kernel in line with how XenOLinux does it.

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