KVM: MMU: Add tracepoint for guest page aging

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

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index b8da671..7397932 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -151,6 +151,9 @@ module_param(oos_shadow, bool, 0644);
 #define ACC_USER_MASK    PT_USER_MASK
 #define ACC_ALL          (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK)
 
+#include <trace/events/kvm.h>
+
+#undef TRACE_INCLUDE_FILE
 #define CREATE_TRACE_POINTS
 #include "mmutrace.h"
 
@@ -792,6 +795,7 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
                                         unsigned long data))
 {
        int i, j;
+       int ret;
        int retval = 0;
        struct kvm_memslots *slots;
 
@@ -806,16 +810,17 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
                if (hva >= start && hva < end) {
                        gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT;
 
-                       retval |= handler(kvm, &memslot->rmap[gfn_offset],
-                                         data);
+                       ret = handler(kvm, &memslot->rmap[gfn_offset], data);
 
                        for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) {
                                int idx = gfn_offset;
                                idx /= KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL + j);
-                               retval |= handler(kvm,
+                               ret |= handler(kvm,
                                        &memslot->lpage_info[j][idx].rmap_pde,
                                        data);
                        }
+                       trace_kvm_age_page(hva, memslot, ret);
+                       retval |= ret;
                }
        }
 

diff --git a/include/trace/events/kvm.h b/include/trace/events/kvm.h
index 8abdc12..b17d49d 100644 (file)
--- 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 */