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: <4F7AE321020000780007C456@nat28.tlf.novell.com>
Date:	Tue, 03 Apr 2012 10:46:41 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"David Vrabel" <david.vrabel@...rix.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	<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 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).

Jan

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