Messages in this thread Patch in this message | | | From | Avi Kivity <> | Subject | [PATCH 14/18] KVM: VMX: Avoid unnecessary vcpu_load()/vcpu_put() cycles | Date | Thu, 26 Apr 2007 12:22:14 +0300 |
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From: Eddie Dong <eddie.dong@intel.com>
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> --- 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); -- 1.5.0.6 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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