KVM: MMU: add tracepoint for kvm_mmu_invalidate_all_pages

It is good for debug and development

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c8063b9..3fd060a 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4264,6 +4264,7 @@ restart:
 void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm)
 {
        spin_lock(&kvm->mmu_lock);
+       trace_kvm_mmu_invalidate_zap_all_pages(kvm);
        kvm->arch.mmu_valid_gen++;
 
        kvm_zap_obsolete_pages(kvm);

diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 697f466..eb444dd 100644 (file)
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -276,6 +276,26 @@ TRACE_EVENT(
                  __spte_satisfied(old_spte), __spte_satisfied(new_spte)
        )
 );
+
+TRACE_EVENT(
+       kvm_mmu_invalidate_zap_all_pages,
+       TP_PROTO(struct kvm *kvm),
+       TP_ARGS(kvm),
+
+       TP_STRUCT__entry(
+               __field(unsigned long, mmu_valid_gen)
+               __field(unsigned int, mmu_used_pages)
+       ),
+
+       TP_fast_assign(
+               __entry->mmu_valid_gen = kvm->arch.mmu_valid_gen;
+               __entry->mmu_used_pages = kvm->arch.n_used_mmu_pages;
+       ),
+
+       TP_printk("kvm-mmu-valid-gen %lx used_pages %x",
+                 __entry->mmu_valid_gen, __entry->mmu_used_pages
+       )
+);
 #endif /* _TRACE_KVMMMU_H */
 
 #undef TRACE_INCLUDE_PATH