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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 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 */
 
 /* This part must be outside protection */
-- 
1.7.5.4


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