From: Arnd Bergmann <arnd@arndb•de>
To: Mel Gorman <mel@csn•ul.ie>
Cc: linuxppc-dev@ozlabs•org, kniht@linux•vnet.ibm.com,
Linux Memory Management List <linux-mm@kvack•org>
Subject: Re: [PATCH 1/2] powerpc: add hugepagesz boot-time parameter
Date: Wed, 28 Nov 2007 17:30:40 +0100 [thread overview]
Message-ID: <200711281730.40907.arnd@arndb.de> (raw)
In-Reply-To: <20071128161201.GA10916@csn.ul.ie>
On Wednesday 28 November 2007, Mel Gorman wrote:
> On (28/11/07 08:26), Arnd Bergmann didst pronounce:
> > On Wednesday 28 November 2007, Jon Tollefson wrote:
> > > This patch adds the hugepagesz boot-time parameter for ppc64 that let=
s=20
> > > you pick the size for your huge pages. =A0The choices available are 6=
4K=20
> > > and 16M. =A0It defaults to 16M (previously the only choice) if nothin=
g or=20
> > > an invalid choice is specified. =A0Tested 64K huge pages with the=20
> > > libhugetlbfs 1.2 release with its 'make func' and 'make stress' test=
=20
> > > invocations.
> >=20
> > How hard would it be to add the 1MB page size that some CPUs support
> > as well? On systems with small physical memory like the PS3, that
> > sounds very useful to me.
> >=20
>=20
> Does the PS3 support 1M pages in hardware? When I last looked, the magic
> ibm,segment-page-sizes file that described the supported pagesizes was
> missing from the device tree. In this situation, the default sizes
> become 4K and 16M because no other ones are advertised.
I think you can select the page size using a hypercall on the PS3.
The CPU supports any two of (64k, 1M, 16M) simultaneously.
Arnd <><
next prev parent reply other threads:[~2007-11-28 16:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-28 5:03 [PATCH 1/2] powerpc: add hugepagesz boot-time parameter Jon Tollefson
2007-11-28 7:26 ` Arnd Bergmann
2007-11-28 16:12 ` Mel Gorman
2007-11-28 16:30 ` Arnd Bergmann [this message]
2007-11-28 21:22 ` Geoff Levand
2007-11-28 21:28 ` Randy Dunlap
2007-11-29 1:36 ` Nish Aravamudan
2007-11-29 1:40 ` Randy Dunlap
2007-11-29 3:01 ` Nish Aravamudan
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