Re: [PATCH 00/11] HugeTLB and THP support for ARM64.

[Steve Capper <steve.capper@linaro.org>]

On Thu, May 23, 2013 at 06:07:47PM +0100, Steve Capper wrote:
> This series brings huge pages and transparent huge pages to ARM64.
> The functionality is very similar to x86, and a lot of code that can
> be used by both ARM64 and x86 is brought into mm to avoid the need
> for code duplication.
> 
> One notable difference from x86 is that ARM64 supports normal pages
> that are 64KB. When 64KB pages are enabled, huge page and
> transparent huge pages are 512MB only, otherwise the sizes match
> x86.
> 
> This series applies to 3.10-rc2.
> 
> I've tested this under the ARMv8 Fast model and the x86 code has
> been tested in a KVM guest. libhugetlbfs was used for testing under
> both architectures.
> 
> Changelog:
> Patch:
>    * pud_large usage replaced with pud_huge for general hugetlb
>      code imported into mm.
>    * comments tidied up for bit swap of PTE_FILE, PTE_PROT_NONE.
> 
> RFC v2:
>    * PROT_NONE support added for HugeTLB and THP.
>    * pmd_modify implementation fixed.
>    * Superfluous huge dcache flushing code removed.
>    * Simplified (and corrected) MAX_ORDER raise for THP && 64KB
>      pages.
>    * The MAX_ORDER check in huge_mm.h has been corrected.
> 
> ---
> 
> Steve Capper (11):
>   mm: hugetlb: Copy huge_pmd_share from x86 to mm.
>   x86: mm: Remove x86 version of huge_pmd_share.
>   mm: hugetlb: Copy general hugetlb code from x86 to mm.
>   x86: mm: Remove general hugetlb code from x86.
>   mm: thp: Correct the HPAGE_PMD_ORDER check.
>   ARM64: mm: Restore memblock limit when map_mem finished.
>   ARM64: mm: Make PAGE_NONE pages read only and no-execute.
>   ARM64: mm: Swap PTE_FILE and PTE_PROT_NONE bits.
>   ARM64: mm: HugeTLB support.
>   ARM64: mm: Raise MAX_ORDER for 64KB pages and THP.
>   ARM64: mm: THP support.

[ ... ]

Hello,
I was just wondering if there were any comments on the mm and x86 patches in
this series, or should I send a pull request for them?

Catalin has acked the ARM64 ones but we need the x86->mm code move in place
before the ARM64 code is merged. The idea behind the code move was to avoid
code duplication between x86 and ARM64 (and ARM).

Thanks,
-- 
Steve

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