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Date:	Tue, 8 Feb 2011 09:55:51 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.Com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	Jan Beulich <JBeulich@...ell.com>
Subject: Re: [PATCH] x86/mm/init: respect memblock reserved regions when
 destroying mappings

> >> could be used to skip clear highmap for xen path?
> >
> > Seems pretty ad-hoc.
> >
> 
> then what is size for mfn-list after _end...

8 bytes * nr_pages. For 4GB, 2048 pages. For 32GB, 8192 pages. For 128GB,
32768 pages, and so on.
> 
> could be copied or move to BRK.

The _brk size is determined during build-time. We don't know what the
memory size will be during bootup time and would have to select the
highest values (128MB) which is quite a large amount to be reserved
in _brk area.
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