2014-12-16 09:08-0500, Marcelo Tosatti:
> Add tracepoint to wait_lapic_expire.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Reviewed-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
> +++ kvm/arch/x86/kvm/lapic.c
> @@ -1120,7 +1120,7 @@ static bool lapic_timer_int_injected(str
> void wait_lapic_expire(struct kvm_vcpu *vcpu)
> {
> struct kvm_lapic *apic = vcpu->arch.apic;
> - u64 guest_tsc, tsc_deadline;
> + u64 orig_guest_tsc, guest_tsc, tsc_deadline;
>
> if (!kvm_vcpu_has_lapic(vcpu))
> return;
> @@ -1133,7 +1133,7 @@ void wait_lapic_expire(struct kvm_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());
> + orig_guest_tsc = guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
(We could move the tracepoint here and save orig_guest_tsc.)
> while (guest_tsc < tsc_deadline) {
> int delay = min(tsc_deadline - guest_tsc, 1000ULL);
> @@ -1141,6 +1141,8 @@ void wait_lapic_expire(struct kvm_vcpu *
> __delay(delay);
> guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, native_read_tsc());
> }
> +
> + trace_kvm_wait_lapic_expire(vcpu->vcpu_id, orig_guest_tsc - tsc_deadline);
> }
>
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