linux-kernel - Re: [PATCH 07/15] xen/trace: add xen_pgd

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Date:	Mon, 20 Jun 2011 20:28:18 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Xen Devel <Xen-devel@...ts.xensource.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 07/15] xen/trace: add xen_pgd_(un)pin tracepoints

On Mon, 2011-06-20 at 15:15 -0700, Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> ---
>  arch/x86/xen/mmu.c         |    4 ++++
>  include/trace/events/xen.h |   24 ++++++++++++++++++++++++
>  2 files changed, 28 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
> index 84c796f..8aaa398 100644
> --- a/arch/x86/xen/mmu.c
> +++ b/arch/x86/xen/mmu.c
> @@ -884,6 +884,8 @@ static int xen_pin_page(struct mm_struct *mm, struct page *page,
>     read-only, and can be pinned. */
>  static void __xen_pgd_pin(struct mm_struct *mm, pgd_t *pgd)
>  {
> +	trace_xen_mmu_pgd_pin(mm, pgd);
> +
>  	xen_mc_batch();
>  
>  	if (__xen_pgd_walk(mm, pgd, xen_pin_page, USER_LIMIT)) {
> @@ -1009,6 +1011,8 @@ static int xen_unpin_page(struct mm_struct *mm, struct page *page,
>  /* Release a pagetables pages back as normal RW */
>  static void __xen_pgd_unpin(struct mm_struct *mm, pgd_t *pgd)
>  {
> +	trace_xen_mmu_pgd_unpin(mm, pgd);
> +
>  	xen_mc_batch();
>  
>  	xen_do_pin(MMUEXT_UNPIN_TABLE, PFN_DOWN(__pa(pgd)));
> diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
> index 16edcb7..5811c24 100644
> --- a/include/trace/events/xen.h
> +++ b/include/trace/events/xen.h
> @@ -381,6 +381,30 @@ TRACE_EVENT(xen_mmu_release_ptpage,
>  		      __entry->pinned ? "" : "un")
>  	);
>  
> +TRACE_EVENT(xen_mmu_pgd_pin,
> +	    TP_PROTO(struct mm_struct *mm, pgd_t *pgd),
> +	    TP_ARGS(mm, pgd),
> +	    TP_STRUCT__entry(
> +		    __field(struct mm_struct *, mm)
> +		    __field(pgd_t *, pgd)
> +		    ),
> +	    TP_fast_assign(__entry->mm = mm;
> +			   __entry->pgd = pgd),
> +	    TP_printk("mm %p pgd %p", __entry->mm, __entry->pgd)
> +	);
> +
> +TRACE_EVENT(xen_mmu_pgd_unpin,
> +	    TP_PROTO(struct mm_struct *mm, pgd_t *pgd),
> +	    TP_ARGS(mm, pgd),
> +	    TP_STRUCT__entry(
> +		    __field(struct mm_struct *, mm)
> +		    __field(pgd_t *, pgd)
> +		    ),
> +	    TP_fast_assign(__entry->mm = mm;
> +			   __entry->pgd = pgd),
> +	    TP_printk("mm %p pgd %p", __entry->mm, __entry->pgd)
> +	);
> +
>  #endif /*  _TRACE_XEN_H */


Looks like there's lots of candidates for DECLARE_EVENT_CLASS() and
DEFINE_EVENT()s.

-- Steve

>  
>  /* This part must be outside protection */


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