linux-kernel - Re: [patch 1/1] oprofile: Add a special cookie for the VDSO region

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Message-Id: <20061214154211.34b0a7f7.akpm@osdl.org>
Date:	Thu, 14 Dec 2006 15:42:11 -0800
From:	Andrew Morton <akpm@...l.org>
To:	"Amitabha Roy" <amitabha.roy@...il.com>
Cc:	phil.el@...adoo.fr, oprofile-list@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/1] oprofile: Add a special cookie for the VDSO region

On Mon, 11 Dec 2006 15:26:26 +0530
"Amitabha Roy" <amitabha.roy@...il.com> wrote:

> Emit a special VDSO_COOKIE for VDSO regions instead of simply marking
> them as anon.

Why?

> Signed-off-by: Amitabha Roy <amitabha.roy@...il.com>
> ---
> diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
> index 78c2e6e..7f879db 100644
> --- a/drivers/oprofile/buffer_sync.c
> +++ b/drivers/oprofile/buffer_sync.c
> @@ -250,7 +250,14 @@ static unsigned long lookup_dcookie(stru
>  				vma->vm_file->f_path.mnt);
>  			*offset = (vma->vm_pgoff << PAGE_SHIFT) + addr -
>  				vma->vm_start;
> -		} else {
> +		}
> +#ifdef CONFIG_X86_32
> +		else if(mm->context.vdso==vma->vm_start){
> +                        cookie = VDSO_COOKIE;
> +		        *offset = addr;
> +		}
> +#endif
> +		else {
>  			/* must be an anonymous map */
>  			*offset = addr;
>  		}
> diff --git a/drivers/oprofile/event_buffer.h b/drivers/oprofile/event_buffer.h
> index 9241627..edc8ee2 100644
> --- a/drivers/oprofile/event_buffer.h
> +++ b/drivers/oprofile/event_buffer.h
> @@ -35,6 +35,7 @@ #define CTX_TGID_CODE			7
>  #define TRACE_BEGIN_CODE		8
>  #define TRACE_END_CODE			9
> 
> +#define VDSO_COOKIE ~1UL
>  #define INVALID_COOKIE ~0UL
>  #define NO_COOKIE 0UL


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