RE: [PATCH/RFC] Shared page tables

[Chen, Kenneth W]

Robin Holt wrote on Tuesday, January 17, 2006 3:53 PM
> This appears to work on ia64 with the attached patch.  Could you
> send me any test application you think would be helpful for me
> to verify it is operating correctly?  I could not get the PTSHARE_PUD
> to compile.  I put _NO_ effort into it.  I found the following line
> was invalid and quit trying.
> 
> --- linux-2.6.orig/arch/ia64/Kconfig	2006-01-14 07:16:46.149226872 -0600
> +++ linux-2.6/arch/ia64/Kconfig	2006-01-14 07:25:02.228853432 -0600
> @@ -289,6 +289,38 @@ source "mm/Kconfig"
>  config ARCH_SELECT_MEMORY_MODEL
>  	def_bool y
>  
> +
> +config PTSHARE_HUGEPAGE
> +	bool
> +	depends on PTSHARE && PTSHARE_PMD
> +	default y
> +

You need to thread carefully with hugetlb ptshare on ia64. PTE for
hugetlb page on ia64 observe full page table levels, not like x86
that sits in the pmd level.

- Ken

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