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

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Date:	Tue, 21 Jun 2011 10:30:57 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Steven Rostedt <rostedt@...dmis.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 06/20/2011 05:28 PM, Steven Rostedt wrote:
> 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.

Thanks for the pointer, that cleans things up a bit.

    J
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