linux-kernel - Re: [PATCH] convert parisc to sparsemem (was Re: [PATCH v3] mm: make expand_downwards symmetrical to expand

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Date:	Sun, 24 Apr 2011 12:27:14 -0400
From:	John David Anglin <dave@...uly1.hia.nrc.ca>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	linux-parisc@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	x86 maintainers <x86@...nel.org>, Tejun Heo <tj@...nel.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] convert parisc to sparsemem (was Re: [PATCH v3] mm:
	make expand_downwards symmetrical to expand_upwards)

On Sat, 23 Apr 2011, James Bottomley wrote:

> The boot sequence got a few seconds slower because now all of the loops
> over our pfn ranges actually have to skip through the holes (which takes
> time for 64GB).

On my rp3440, the biggest gap seems to be 265GB:

dave@...210:~$ cat /proc/iomem
00000000-3fffffff : System RAM
00000000-000009ff : PDC data (Page Zero)
00100000-004acfff : Kernel code
004ad000-00661fff : Kernel data
40000000-4fffffff : IOVA Space
100000000-27fdfffff : System RAM
4040000000-40ffffffff : System RAM

Dave
-- 
J. David Anglin                                  dave.anglin@...-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)
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