Add a tracepoint that records whenever KVM eagerly splits a huge page.
Signed-off-by: David Matlack <dmatlack@xxxxxxxxxx>
---
arch/x86/kvm/mmu/mmutrace.h | 20 ++++++++++++++++++++
arch/x86/kvm/mmu/tdp_mmu.c | 2 ++
2 files changed, 22 insertions(+)
diff --git a/arch/x86/kvm/mmu/mmutrace.h b/arch/x86/kvm/mmu/mmutrace.h
index de5e8e4e1aa7..4feabf773387 100644
--- a/arch/x86/kvm/mmu/mmutrace.h
+++ b/arch/x86/kvm/mmu/mmutrace.h
@@ -416,6 +416,26 @@ TRACE_EVENT(
)
);
+TRACE_EVENT(
+ kvm_mmu_split_huge_page,
+ TP_PROTO(u64 gfn, u64 spte, int level),
+ TP_ARGS(gfn, spte, level),
+
+ TP_STRUCT__entry(
+ __field(u64, gfn)
+ __field(u64, spte)
+ __field(int, level)
+ ),
+
+ TP_fast_assign(
+ __entry->gfn = gfn;
+ __entry->spte = spte;
+ __entry->level = level;
+ ),
+
+ TP_printk("gfn %llx spte %llx level %d", __entry->gfn, __entry->spte, __entry->level)
+);
+
#endif /* _TRACE_KVMMMU_H */
#undef TRACE_INCLUDE_PATH
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index be5eb74ac053..e6910b9b5c12 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1325,6 +1325,8 @@ tdp_mmu_split_huge_page_atomic(struct kvm *kvm, struct tdp_iter *iter, struct kv
u64 child_spte;
int i;
+ trace_kvm_mmu_split_huge_page(iter->gfn, huge_spte, level);
+
init_child_tdp_mmu_page(sp, iter);
for (i = 0; i < PT64_ENT_PER_PAGE; i++) {
--
2.34.1.173.g76aa8bc2d0-goog
