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SubjectRe: [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@gmail.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@gmail.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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