linux-kernel - Re: [PATCH V2] mm/hugetlb: Add mmap() encodings for 32MB and 512MB page sizes

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Message-ID: <871s9hsxmi.fsf@e105922-lin.cambridge.arm.com>
Date:   Tue, 25 Sep 2018 11:02:45 +0100
From:   Punit Agrawal <punit.agrawal@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mike.kravetz@...cle.com, mhocko@...nel.org, will.deacon@....com,
        akpm@...ux-foundation.org
Subject: Re: [PATCH V2] mm/hugetlb: Add mmap() encodings for 32MB and 512MB page sizes

Anshuman Khandual <anshuman.khandual@....com> writes:

> ARM64 architecture also supports 32MB and 512MB HugeTLB page sizes.
> This just adds mmap() system call argument encoding for them.
>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Thanks for adding the encodings.

Acked-by: Punit Agrawal <punit.agrawal@....com>

> ---
>
> Changes in V2:
> - Updated SHM and MFD definitions per Mike
>
>  include/uapi/asm-generic/hugetlb_encode.h | 2 ++
>  include/uapi/linux/memfd.h                | 2 ++
>  include/uapi/linux/mman.h                 | 2 ++
>  include/uapi/linux/shm.h                  | 2 ++
>  4 files changed, 8 insertions(+)
>
> diff --git a/include/uapi/asm-generic/hugetlb_encode.h b/include/uapi/asm-generic/hugetlb_encode.h
> index e4732d3..b0f8e87 100644
> --- a/include/uapi/asm-generic/hugetlb_encode.h
> +++ b/include/uapi/asm-generic/hugetlb_encode.h
> @@ -26,7 +26,9 @@
>  #define HUGETLB_FLAG_ENCODE_2MB		(21 << HUGETLB_FLAG_ENCODE_SHIFT)
>  #define HUGETLB_FLAG_ENCODE_8MB		(23 << HUGETLB_FLAG_ENCODE_SHIFT)
>  #define HUGETLB_FLAG_ENCODE_16MB	(24 << HUGETLB_FLAG_ENCODE_SHIFT)
> +#define HUGETLB_FLAG_ENCODE_32MB	(25 << HUGETLB_FLAG_ENCODE_SHIFT)
>  #define HUGETLB_FLAG_ENCODE_256MB	(28 << HUGETLB_FLAG_ENCODE_SHIFT)
> +#define HUGETLB_FLAG_ENCODE_512MB	(29 << HUGETLB_FLAG_ENCODE_SHIFT)
>  #define HUGETLB_FLAG_ENCODE_1GB		(30 << HUGETLB_FLAG_ENCODE_SHIFT)
>  #define HUGETLB_FLAG_ENCODE_2GB		(31 << HUGETLB_FLAG_ENCODE_SHIFT)
>  #define HUGETLB_FLAG_ENCODE_16GB	(34 << HUGETLB_FLAG_ENCODE_SHIFT)
> diff --git a/include/uapi/linux/memfd.h b/include/uapi/linux/memfd.h
> index 015a4c0..7a8a267 100644
> --- a/include/uapi/linux/memfd.h
> +++ b/include/uapi/linux/memfd.h
> @@ -25,7 +25,9 @@
>  #define MFD_HUGE_2MB	HUGETLB_FLAG_ENCODE_2MB
>  #define MFD_HUGE_8MB	HUGETLB_FLAG_ENCODE_8MB
>  #define MFD_HUGE_16MB	HUGETLB_FLAG_ENCODE_16MB
> +#define MFD_HUGE_32MB	HUGETLB_FLAG_ENCODE_32MB
>  #define MFD_HUGE_256MB	HUGETLB_FLAG_ENCODE_256MB
> +#define MFD_HUGE_512MB	HUGETLB_FLAG_ENCODE_512MB
>  #define MFD_HUGE_1GB	HUGETLB_FLAG_ENCODE_1GB
>  #define MFD_HUGE_2GB	HUGETLB_FLAG_ENCODE_2GB
>  #define MFD_HUGE_16GB	HUGETLB_FLAG_ENCODE_16GB
> diff --git a/include/uapi/linux/mman.h b/include/uapi/linux/mman.h
> index bfd5938..d0f515d 100644
> --- a/include/uapi/linux/mman.h
> +++ b/include/uapi/linux/mman.h
> @@ -28,7 +28,9 @@
>  #define MAP_HUGE_2MB	HUGETLB_FLAG_ENCODE_2MB
>  #define MAP_HUGE_8MB	HUGETLB_FLAG_ENCODE_8MB
>  #define MAP_HUGE_16MB	HUGETLB_FLAG_ENCODE_16MB
> +#define MAP_HUGE_32MB	HUGETLB_FLAG_ENCODE_32MB
>  #define MAP_HUGE_256MB	HUGETLB_FLAG_ENCODE_256MB
> +#define MAP_HUGE_512MB	HUGETLB_FLAG_ENCODE_512MB
>  #define MAP_HUGE_1GB	HUGETLB_FLAG_ENCODE_1GB
>  #define MAP_HUGE_2GB	HUGETLB_FLAG_ENCODE_2GB
>  #define MAP_HUGE_16GB	HUGETLB_FLAG_ENCODE_16GB
> diff --git a/include/uapi/linux/shm.h b/include/uapi/linux/shm.h
> index dde1344..6507ad0 100644
> --- a/include/uapi/linux/shm.h
> +++ b/include/uapi/linux/shm.h
> @@ -65,7 +65,9 @@ struct shmid_ds {
>  #define SHM_HUGE_2MB	HUGETLB_FLAG_ENCODE_2MB
>  #define SHM_HUGE_8MB	HUGETLB_FLAG_ENCODE_8MB
>  #define SHM_HUGE_16MB	HUGETLB_FLAG_ENCODE_16MB
> +#define SHM_HUGE_32MB	HUGETLB_FLAG_ENCODE_32MB
>  #define SHM_HUGE_256MB	HUGETLB_FLAG_ENCODE_256MB
> +#define SHM_HUGE_512MB	HUGETLB_FLAG_ENCODE_512MB
>  #define SHM_HUGE_1GB	HUGETLB_FLAG_ENCODE_1GB
>  #define SHM_HUGE_2GB	HUGETLB_FLAG_ENCODE_2GB
>  #define SHM_HUGE_16GB	HUGETLB_FLAG_ENCODE_16GB