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authorYaozu Dong <eddie.dong@intel.com>2007-04-25 16:49:19 +0300
committerAvi Kivity <avi@qumranet.com>2007-05-03 10:52:30 +0300
commit3fca03653010b8c5fa63b99fc94c78cbfb433d00 (patch)
tree9102be63cdedd172fa1d58959218d1c698df7848 /drivers/kvm
parentd6c69ee9a24b307ce94e55ebfba6208a830c9ecb (diff)
downloadop-kernel-dev-3fca03653010b8c5fa63b99fc94c78cbfb433d00.zip
op-kernel-dev-3fca03653010b8c5fa63b99fc94c78cbfb433d00.tar.gz
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 <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm')
-rw-r--r--drivers/kvm/kvm_main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 03c0ee7..f535635 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);
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