RE: [PATCH/RFC] Shared page tables

Chen, Kenneth W
2006-01-18T01:27:09Z

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