From 3fca03653010b8c5fa63b99fc94c78cbfb433d00 Mon Sep 17 00:00:00 2001 From: Yaozu Dong Date: Wed, 25 Apr 2007 16:49:19 +0300 Subject: [PATCH] KVM: VMX: Avoid unnecessary vcpu_load()/vcpu_put() cycles By checking if a reschedule is needed, we avoid dropping the vcpu. [With changes by me, based on Anthony Liguori's observations] Signed-off-by: Avi Kivity --- drivers/kvm/kvm_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 03c0ee74d757..f5356358acff 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1590,6 +1590,8 @@ static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) void kvm_resched(struct kvm_vcpu *vcpu) { + if (!need_resched()) + return; vcpu_put(vcpu); cond_resched(); vcpu_load(vcpu); -- 2.30.2