[PATCH 1/2] powerpc: add hugepagesz boot-time parameter

Mel Gorman mel at csn.ul.ie
Thu Nov 29 03:12:02 EST 2007

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 lets 
> > you pick the size for your huge pages.  The choices available are 64K 
> > and 16M.  It defaults to 16M (previously the only choice) if nothing or 
> > an invalid choice is specified.  Tested 64K huge pages with the 
> > libhugetlbfs 1.2 release with its 'make func' and 'make stress' test 
> > invocations.
> 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.

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.

Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab

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