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Re: sparsemem support for mips with highmem

To: Christoph Lameter <cl@linux-foundation.org>
Subject: Re: sparsemem support for mips with highmem
From: Dave Hansen <dave@linux.vnet.ibm.com>
Date: Mon, 18 Aug 2008 14:27:45 -0700
Cc: Randy Dunlap <rdunlap@xenotime.net>, C Michael Sundius <Michael.sundius@sciatl.com>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, linux-mm@kvack.org, linux-mips@linux-mips.org, jfraser@broadcom.com, Andy Whitcroft <apw@shadowen.org>
In-reply-to: <48A9E89C.4020408@linux-foundation.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <48A4AC39.7020707@sciatl.com> <1218753308.23641.56.camel@nimitz> <48A4C542.5000308@sciatl.com> <20080815080331.GA6689@alpha.franken.de> <1218815299.23641.80.camel@nimitz> <48A5AADE.1050808@sciatl.com> <20080815163302.GA9846@alpha.franken.de> <48A5B9F1.3080201@sciatl.com> <1218821875.23641.103.camel@nimitz> <48A5C831.3070002@sciatl.com> <20080818094412.09086445.rdunlap@xenotime.net> <48A9E89C.4020408@linux-foundation.org>
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On Mon, 2008-08-18 at 16:24 -0500, Christoph Lameter wrote:
> 
> This overhead can be avoided by configuring sparsemem to use a virtual vmemmap
> (CONFIG_SPARSEMEM_VMEMMAP). In that case it can be used for non NUMA since the
> overhead is less than even FLATMEM.

Is that all it takes these days, or do you need some other arch-specific
code to help out?

-- Dave


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