Re: [PATCH 07/15] xen/trace: add xen_pgd_(un)pin tracepoints

Jeremy Fitzhardinge
2011-06-21T17:31:01Z

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@citrix.com>
>>
>> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.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