KVM: MMU: Add tracepoint for guest page aging

Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index 8abdc1230143..b17d49dfc3ef 100644
--- a/include/trace/events/kvm.h
+++ b/include/trace/events/kvm.h
@@ -164,6 +164,28 @@ TRACE_EVENT(kvm_fpu,
         TP_printk("%s", __print_symbolic(__entry->load, kvm_fpu_load_symbol))
 );
 
+TRACE_EVENT(kvm_age_page,
+        TP_PROTO(ulong hva, struct kvm_memory_slot *slot, int ref),
+        TP_ARGS(hva, slot, ref),
+
+        TP_STRUCT__entry(
+                __field(        u64,    hva             )
+                __field(        u64,    gfn             )
+                __field(        u8,     referenced      )
+        ),
+
+        TP_fast_assign(
+                __entry->hva            = hva;
+                __entry->gfn            =
+                  slot->base_gfn + ((hva - slot->userspace_addr) >> PAGE_SHIFT);
+                __entry->referenced     = ref;
+        ),
+
+        TP_printk("hva %llx gfn %llx %s",
+                  __entry->hva, __entry->gfn,
+                  __entry->referenced ? "YOUNG" : "OLD")
+);
+
 #endif /* _TRACE_KVM_MAIN_H */
 
 /* This part must be outside protection */