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List:       kvm
Subject:    [patch 3/3] KVM: x86: add tracepoint to wait_lapic_expire
From:       Marcelo Tosatti <mtosatti () redhat ! com>
Date:       2014-12-23 20:58:44
Message-ID: 20141223210046.899437436 () redhat ! com
[Download RAW message or body]

Add tracepoint to wait_lapic_expire.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm/arch/x86/kvm/lapic.c
===================================================================
--- kvm.orig/arch/x86/kvm/lapic.c
+++ kvm/arch/x86/kvm/lapic.c
@@ -1137,6 +1137,8 @@ void wait_lapic_expire(struct kvm_vcpu *
 
 	if (guest_tsc < tsc_deadline)
 		__delay(tsc_deadline - guest_tsc);
+
+	trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
 }
 
 static void start_apic_timer(struct kvm_lapic *apic)
Index: kvm/arch/x86/kvm/trace.h
===================================================================
--- kvm.orig/arch/x86/kvm/trace.h
+++ kvm/arch/x86/kvm/trace.h
@@ -914,6 +914,25 @@ TRACE_EVENT(kvm_pvclock_update,
 		  __entry->flags)
 );
 
+TRACE_EVENT(kvm_wait_lapic_expire,
+	TP_PROTO(unsigned int vcpu_id, s64 delta),
+	TP_ARGS(vcpu_id, delta),
+
+	TP_STRUCT__entry(
+		__field(	unsigned int,	vcpu_id		)
+		__field(	s64,		delta		)
+	),
+
+	TP_fast_assign(
+		__entry->vcpu_id	   = vcpu_id;
+		__entry->delta             = delta;
+	),
+
+	TP_printk("vcpu %u: delta %lld",
+		  __entry->vcpu_id,
+		  __entry->delta)
+);
+
 #endif /* _TRACE_KVM_H */
 
 #undef TRACE_INCLUDE_PATH


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