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SubjectRe: [RFC PATCH 05/26] hugetlb: add CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING
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On 24/06/22 11:06 pm, James Houghton wrote:
> This adds the Kconfig to enable or disable high-granularity mapping. It
> is enabled by default for architectures that use
> ARCH_WANT_GENERAL_HUGETLB.
>
> There is also an arch-specific config ARCH_HAS_SPECIAL_HUGETLB_HGM which
> controls whether or not the architecture has been updated to support
> HGM if it doesn't use general HugeTLB.
>
> Signed-off-by: James Houghton <jthoughton@google.com>
reviewed-by:manish.mishra@nutanix.com
> ---
> fs/Kconfig | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 5976eb33535f..d76c7d812656 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -268,6 +268,13 @@ config HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON
> to enable optimizing vmemmap pages of HugeTLB by default. It can then
> be disabled on the command line via hugetlb_free_vmemmap=off.
>
> +config ARCH_HAS_SPECIAL_HUGETLB_HGM
> + bool
> +
> +config HUGETLB_HIGH_GRANULARITY_MAPPING
> + def_bool ARCH_WANT_GENERAL_HUGETLB || ARCH_HAS_SPECIAL_HUGETLB_HGM
> + depends on HUGETLB_PAGE
> +
> config MEMFD_CREATE
> def_bool TMPFS || HUGETLBFS
>

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