Re: [PATCH v5 3/7] x86: mm/gup: add gup trace points

[Shi, Yang]

Hi folks,

Any comment for this one? The tracing part review has been done.

Thanks,
Yang


On 12/9/2015 1:22 PM, Yang Shi wrote:
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: x86@xxxxxxxxxx
> Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxx>
> ---
>   arch/x86/mm/gup.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
> index ae9a37b..df5f3ab 100644
> --- a/arch/x86/mm/gup.c
> +++ b/arch/x86/mm/gup.c
> @@ -12,6 +12,8 @@
>
>   #include <asm/pgtable.h>
>
> +#include <trace/events/gup.h>
> +
>   static inline pte_t gup_get_pte(pte_t *ptep)
>   {
>   #ifndef CONFIG_X86_PAE
> @@ -270,6 +272,8 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
>   					(void __user *)start, len)))
>   		return 0;
>
> +	trace_gup_get_user_pages_fast(start, nr_pages);
> +
>   	/*
>   	 * XXX: batch / limit 'nr', to avoid large irq off latency
>   	 * needs some instrumenting to determine the common sizes used by
> @@ -373,6 +377,8 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
>   	} while (pgdp++, addr = next, addr != end);
>   	local_irq_enable();
>
> +	trace_gup_get_user_pages_fast(start, nr_pages);
> +
>   	VM_BUG_ON(nr != (end - start) >> PAGE_SHIFT);
>   	return nr;