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KVM: VMX: Avoid unnecessary vcpu_load()/vcpu_put() cycles

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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 <avi@qumranet.com>
This commit is contained in:
Yaozu Dong 2007-04-25 16:49:19 +03:00 committed by Avi Kivity
parent d6c69ee9a2
commit 3fca036530
1 changed files with 2 additions and 0 deletions
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drivers/kvm/kvm_main.c
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@ -1590,6 +1590,8 @@ static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
void kvm_resched(struct kvm_vcpu *vcpu) void kvm_resched(struct kvm_vcpu *vcpu)
{ {
if (!need_resched())
return;
vcpu_put(vcpu); vcpu_put(vcpu);
cond_resched(); cond_resched();
vcpu_load(vcpu); vcpu_load(vcpu);