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| author | Yaozu Dong <eddie.dong@intel.com> | 2007-04-25 16:49:19 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-05-03 10:52:30 +0300 |
| commit | 3fca03653010b8c5fa63b99fc94c78cbfb433d00 (patch) | |
| tree | 9102be63cdedd172fa1d58959218d1c698df7848 | |
| parent | d6c69ee9a24b307ce94e55ebfba6208a830c9ecb (diff) | |
| download | op-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>
| -rw-r--r-- | drivers/kvm/kvm_main.c | 2 |
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); |
