[PATCH 00/16] Add support for DAX vmemmap optimization for ppc64

Aneesh Kumar K.V aneesh.kumar at linux.ibm.com
Wed Jun 14 14:11:02 AEST 2023

"Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> writes:

> This patch series implements changes required to support DAX vmemmap
> optimization for ppc64. The vmemmap optimization is only enabled with radix MMU
> translation and 1GB PUD mapping with 64K page size. The patch series also split
> hugetlb vmemmap optimization as a separate Kconfig variable so that
> architectures can enable DAX vmemmap optimization without enabling hugetlb
> vmemmap optimization. This should enable architectures like arm64 to enable DAX
> vmemmap optimization while they can't enable hugetlb vmemmap optimization. More
> details of the same are in patch "mm/vmemmap optimization: Split hugetlb and
> d
> Aneesh Kumar K.V (16):
>   powerpc/mm/book3s64: Use pmdp_ptep helper instead of typecasting.
>   powerpc/book3s64/mm: mmu_vmemmap_psize is used by radix
>   powerpc/book3s64/mm: Fix DirectMap stats in /proc/meminfo
>   powerpc/book3s64/mm: Use PAGE_KERNEL instead of opencoding
>   powerpc/mm/dax: Fix the condition when checking if altmap vmemap can
>     cross-boundary
>   mm/hugepage pud: Allow arch-specific helper function to check huge
>     page pud support
>   mm: Change pudp_huge_get_and_clear_full take vm_area_struct as arg
>   mm/vmemmap: Improve vmemmap_can_optimize and allow architectures to
>     override
>   mm/vmemmap: Allow architectures to override how vmemmap optimization
>     works
>   mm: Add __HAVE_ARCH_PUD_SAME similar to __HAVE_ARCH_P4D_SAME
>   mm/huge pud: Use transparent huge pud helpers only with
>   mm/vmemmap optimization: Split hugetlb and devdax vmemmap optimization
>   powerpc/book3s64/mm: Enable transparent pud hugepage
>   powerpc/book3s64/vmemmap: Switch radix to use a different vmemmap
>     handling function
>   powerpc/book3s64/radix: Add support for vmemmap optimization for radix
>   powerpc/book3s64/radix: Remove mmu_vmemmap_psize

   Gentle ping. Any objections for this series? 


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