On Wednesday 28 November 2007, Mel Gorman wrote:

On (28/11/07 08:26), Arnd Bergmann didst pronounce:

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On Wednesday 28 November 2007, Jon Tollefson wrote:

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This patch adds the hugepagesz boot-time parameter for ppc64 that let=

s=20

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you pick the size for your huge pages. =A0The choices available are 6=

4K=20

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and 16M. =A0It defaults to 16M (previously the only choice) if nothin=

g or=20

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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

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invocations.

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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.
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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 <><