The newly-added tracepoint shows the following results on
the tscdeadline_latency test:
qemu-kvm-8387 [002] 6425.558974: kvm_vcpu_wakeup: poll time 10407 ns
qemu-kvm-8387 [002] 6425.558984: kvm_vcpu_wakeup: poll time 0 ns
qemu-kvm-8387 [002] 6425.561242: kvm_vcpu_wakeup: poll time 10477 ns
qemu-kvm-8387 [002] 6425.561251: kvm_vcpu_wakeup: poll time 0 ns
and so on. This is because we need to go through kvm_vcpu_block again
after the timer IRQ is injected. Avoid it by polling once before
entering kvm_vcpu_block.
On my machine (Xeon E5 Sandy Bridge) this removes about 500 cycles (7%)
from the latency of the TSC deadline timer.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/x86/kvm/x86.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0b8dd13676ef..1e766033ebff 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6389,11 +6389,15 @@ static inline int __vcpu_run(struct kvm *kvm, struct kvm_vcpu *vcpu)
!vcpu->arch.apf.halted)
return vcpu_enter_guest(vcpu);
- srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
- kvm_vcpu_block(vcpu);
- vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
- if (!kvm_check_request(KVM_REQ_UNHALT, vcpu))
- return 1;
+ if (kvm_arch_vcpu_runnable(vcpu))
+ clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ else {
+ srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
+ kvm_vcpu_block(vcpu);
+ vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
+ if (!kvm_check_request(KVM_REQ_UNHALT, vcpu))
+ return 1;
+ }
kvm_apic_accept_events(vcpu);
switch(vcpu->arch.mp_state) {
--
1.8.3.1
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
