linux-kernel - [PATCH v6 7/7] KVM: MMU: add tracepoint for kvm_mmu_invalidate_all

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Date:	Fri, 17 May 2013 05:13:02 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	gleb@...hat.com
Cc:	avi.kivity@...il.com, mtosatti@...hat.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Subject: [PATCH v6 7/7] KVM: MMU: add tracepoint for kvm_mmu_invalidate_all_pages

It is good for debug and development

Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
 arch/x86/kvm/mmu.c      |    1 +
 arch/x86/kvm/mmutrace.h |   23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 89b51dc..2c512e8 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4276,6 +4276,7 @@ restart:
 void kvm_mmu_invalidate_all_pages(struct kvm *kvm, bool zap_obsolete_pages)
 {
 	spin_lock(&kvm->mmu_lock);
+	trace_kvm_mmu_invalidate_all_pages(kvm, zap_obsolete_pages);
 	kvm->arch.mmu_valid_gen++;
 
 	/*
diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
index 697f466..e13d253 100644
--- a/arch/x86/kvm/mmutrace.h
+++ b/arch/x86/kvm/mmutrace.h
@@ -276,6 +276,29 @@ TRACE_EVENT(
 		  __spte_satisfied(old_spte), __spte_satisfied(new_spte)
 	)
 );
+
+TRACE_EVENT(
+	kvm_mmu_invalidate_all_pages,
+	TP_PROTO(struct kvm *kvm, bool zap_obsolete_pages),
+	TP_ARGS(kvm, zap_obsolete_pages),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, mmu_valid_gen)
+		__field(unsigned int, mmu_used_pages)
+		__field(bool, zap_obsolete_pages)
+	),
+
+	TP_fast_assign(
+		__entry->mmu_valid_gen = kvm->arch.mmu_valid_gen;
+		__entry->mmu_used_pages = kvm->arch.n_used_mmu_pages;
+		__entry->zap_obsolete_pages = zap_obsolete_pages;
+	),
+
+	TP_printk("kvm-mmu-valid-gen %lx zap_obsolete_pages %d "
+		  "used_pages %x", __entry->mmu_valid_gen,
+		  __entry->zap_obsolete_pages, __entry->mmu_used_pages
+	)
+);
 #endif /* _TRACE_KVMMMU_H */
 
 #undef TRACE_INCLUDE_PATH
-- 
1.7.7.6

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