[patch 3/3] KVM: x86: add tracepoint to wait_lapic_expire

Marcelo Tosatti
2014-12-15T22:10:55Z

[-- Attachment #1: lapic-wait-tracepoint --]
[-- Type: text/plain, Size: 1602 bytes --]

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
@@ -1121,6 +1121,7 @@ void wait_lapic_expire(struct kvm_vcpu *
{
struct kvm_lapic *apic = vcpu->arch.apic;
u64 guest_tsc, tsc_deadline;
+ unsigned int total_delay = 0;

if (!kvm_vcpu_has_lapic(vcpu))
return;
@@ -1138,9 +1139,13 @@ void wait_lapic_expire(struct kvm_vcpu *
while (guest_tsc < tsc_deadline) {
int delay = min(tsc_deadline - guest_tsc, 1000ULL);

+ total_delay += delay;
+
__delay(delay);
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
}
+
+ trace_kvm_wait_lapic_expire(vcpu->vcpu_id, total_delay);
}

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, unsigned int total_delay),
+ TP_ARGS(vcpu_id, total_delay),
+
+ TP_STRUCT__entry(
+ __field( unsigned int, vcpu_id )
+ __field( unsigned int, total_delay )
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_id = vcpu_id;
+ __entry->total_delay = total_delay;
+ ),
+
+ TP_printk("vcpu %u: total_delay %u",
+ __entry->vcpu_id,
+ __entry->total_delay)
+);
+
#endif /* _TRACE_KVM_H */

#undef TRACE_INCLUDE_PATH