Commit 6c19b753 authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Paolo Bonzini
Browse files

KVM: x86: add tracepoint to wait_lapic_expire 



Add tracepoint to wait_lapic_expire.

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
[Remind reader if early or late. - Paolo]
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent d0659d94

arch/x86/kvm/lapic.c

+1 −0
Original line number Diff line number Diff line
@@ -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)

arch/x86/kvm/trace.h

+20 −0
Original line number Diff line number Diff line
@@ -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