[PATCH v2 00/16] Add support for DAX vmemmap optimization for ppc64

[Aneesh Kumar K.V]

Hi Andrew,

"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
> devdax vmemmap optimization"
>
> Changes from V1:
> * Fix make htmldocs warning
> * Fix vmemmap allocation bugs with different alignment values.
> * Correctly check for section validity to before we free vmemmap area
>
> 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
>     CONFIG_TRANSPARENT_HUGEPAGE
>   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
>
>  Documentation/mm/vmemmap_dedup.rst            |   1 +
>  Documentation/powerpc/index.rst               |   1 +
>  Documentation/powerpc/vmemmap_dedup.rst       | 101 +++
>  arch/loongarch/Kconfig                        |   2 +-
>  arch/powerpc/Kconfig                          |   1 +
>  arch/powerpc/include/asm/book3s/64/pgtable.h  | 156 ++++-
>  arch/powerpc/include/asm/book3s/64/radix.h    |  47 ++
>  .../include/asm/book3s/64/tlbflush-radix.h    |   2 +
>  arch/powerpc/include/asm/book3s/64/tlbflush.h |   8 +
>  arch/powerpc/include/asm/pgtable.h            |   3 +
>  arch/powerpc/mm/book3s64/pgtable.c            |  78 +++
>  arch/powerpc/mm/book3s64/radix_pgtable.c      | 577 ++++++++++++++++--
>  arch/powerpc/mm/book3s64/radix_tlb.c          |   7 +
>  arch/powerpc/mm/init_64.c                     |  39 +-
>  arch/powerpc/platforms/Kconfig.cputype        |   1 +
>  arch/riscv/Kconfig                            |   2 +-
>  arch/x86/Kconfig                              |   3 +-
>  drivers/nvdimm/pfn_devs.c                     |   2 +-
>  fs/Kconfig                                    |   2 +-
>  include/linux/mm.h                            |  32 +-
>  include/linux/pgtable.h                       |  11 +-
>  include/trace/events/thp.h                    |  17 +
>  mm/Kconfig                                    |   5 +-
>  mm/debug_vm_pgtable.c                         |   2 +-
>  mm/huge_memory.c                              |   2 +-
>  mm/mm_init.c                                  |   2 +-
>  mm/mremap.c                                   |   2 +-
>  mm/sparse-vmemmap.c                           |   3 +
>  28 files changed, 1032 insertions(+), 77 deletions(-)
>  create mode 100644 Documentation/powerpc/vmemmap_dedup.rst
>

Michael Ellerman merged some of the ppc64 patches. How do
you like to merge the mm changes? Do you like a repost of patches 6-12?

-aneesh