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SubjectRe: [PATCH] mm: make falutaround selectable
From
Date
s/falutaround/faultaround/


On 19.07.21 03:08, Chanho Min wrote:
> While faultaround can have performance gains, on certain platform it
> increases pss and causes swap to occur more frequently. This patch allows
> to unselect faultaround on platforms that do not want this behavior.
>
> Signed-off-by: Chanho Min <chanho.min@lge.com>
> ---
> mm/Kconfig | 6 ++++++
> mm/memory.c | 4 ++++
> 2 files changed, 10 insertions(+)
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 39a6a977537d..8f834386e7f3 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -750,4 +750,10 @@ config ARCH_HAS_PTE_SPECIAL
> config ARCH_HAS_HUGEPD
> bool
>
> +config FAULT_AROUND
> + bool "Enable fault around"
> + default y
> + help
> + This option enables fault around. If say N, fault_around_bytes set to PAGE_SIZE
> + and disables fault around.
> endmenu
> diff --git a/mm/memory.c b/mm/memory.c
> index 10d2e4734e82..0bb037265dda 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3500,7 +3500,11 @@ vm_fault_t finish_fault(struct vm_fault *vmf)
> }
>
> static unsigned long fault_around_bytes __read_mostly =
> +#ifdef CONFIG_FAULT_AROUND
> rounddown_pow_of_two(65536);
> +#else
> + PAGE_SIZE;
> +#endif
>
> #ifdef CONFIG_DEBUG_FS
> static int fault_around_bytes_get(void *data, u64 *val)
>


--
Thanks,

David / dhildenb

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