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authorMarcelo Tosatti <mtosatti@redhat.com>2014-12-16 15:08:16 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2015-01-08 22:48:01 +0100
commit6c19b7538f5ae2b6cdf91ab29f7fddf7320ece5b (patch)
tree895ff83a5ea372ff983d2458652f1995d06e6381
parentKVM: x86: add option to advance tscdeadline hrtimer expiration (diff)
downloadlinux-6c19b7538f5ae2b6cdf91ab29f7fddf7320ece5b.tar.xz
linux-6c19b7538f5ae2b6cdf91ab29f7fddf7320ece5b.zip
KVM: x86: add tracepoint to wait_lapic_expire
Add tracepoint to wait_lapic_expire. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> [Remind reader if early or late. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/x86/kvm/lapic.c1
-rw-r--r--arch/x86/kvm/trace.h20
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e1c0befaa9f6..3eb7f8d9992c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1134,6 +1134,7 @@ void wait_lapic_expire(struct kvm_vcpu *vcpu)
tsc_deadline = apic->lapic_timer.expired_tscdeadline;
apic->lapic_timer.expired_tscdeadline = 0;
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
+ trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
/* __delay is delay_tsc whenever the hardware has TSC, thus always. */
if (guest_tsc < tsc_deadline)
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index c2a34bb5ad93..587149bd6f76 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -914,6 +914,26 @@ 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 (%s)",
+ __entry->vcpu_id,
+ __entry->delta,
+ __entry->delta < 0 ? "early" : "late")
+);
+
#endif /* _TRACE_KVM_H */
#undef TRACE_INCLUDE_PATH