Re: [PATCH V2 0/5] arm64/mm: Enable HugeTLB migration

[Anshuman Khandual]

On 10/12/2018 09:29 AM, Anshuman Khandual wrote:
> This patch series enables HugeTLB migration support for all supported
> huge page sizes at all levels including contiguous bit implementation.
> Following HugeTLB migration support matrix has been enabled with this
> patch series. All permutations have been tested except for the 16GB.
> 
>          CONT PTE    PMD    CONT PMD    PUD
>          --------    ---    --------    ---
> 4K:         64K     2M         32M     1G
> 16K:         2M    32M          1G
> 64K:         2M   512M         16G
> 
> First the series adds migration support for PUD based huge pages. It
> then adds a platform specific hook to query an architecture if a
> given huge page size is supported for migration while also providing
> a default fallback option preserving the existing semantics which just
> checks for (PMD|PUD|PGDIR)_SHIFT macros. The last two patches enables
> HugeTLB migration on arm64 and subscribe to this new platform specific
> hook by defining an override.
> 
> The second patch differentiates between movability and migratability
> aspects of huge pages and implements hugepage_movable_supported() which
> can then be used during allocation to decide whether to place the huge
> page in movable zone or not.
> 
> Changes in V2:
> 
> - Added a new patch which differentiates migratability and movability
>   of huge pages and implements hugepage_movable_supported() function
>   as suggested by Michal Hocko.

Hello Andrew/Michal/Mike/Naoya/Catalin,

Just checking for an update. Does this series looks okay ?

- Anshuman