linux-kernel - Re: [PATCH v4 3/7] x86: mm/gup: add gup trace points

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Date:	Wed, 9 Dec 2015 16:07:49 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	akpm@...ux-foundation.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linaro-kernel@...ts.linaro.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH v4 3/7] x86: mm/gup: add gup trace points

On Wed,  9 Dec 2015 09:29:20 -0800
Yang Shi <yang.shi@...aro.org> wrote:

> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Signed-off-by: Yang Shi <yang.shi@...aro.org>
> ---
>  arch/x86/mm/gup.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
> index ae9a37b..a96bcb7 100644
> --- a/arch/x86/mm/gup.c
> +++ b/arch/x86/mm/gup.c
> @@ -12,6 +12,9 @@
>  
>  #include <asm/pgtable.h>
>  
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/gup.h>>

First off, does the above even compile?

Second, you already created the tracepoints in mm/gup.c, why are you
creating them here again? CREATE_TRACE_POINTS must be defined only once
per events/.h file.

-- Steve

> +
>  static inline pte_t gup_get_pte(pte_t *ptep)
>  {
>  #ifndef CONFIG_X86_PAE
> @@ -270,6 +273,8 @@ 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 +378,8 @@ 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;
>  

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