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: <20120406210117.GB26309@phenom.dumpdata.com>
Date:	Fri, 6 Apr 2012 17:01:18 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	xen-devel@...ts.xensource.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 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'
> 
> Jan
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