Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3fca03653010b8c5fa63b99fc94c78cbfb433d00
Commit: 3fca03653010b8c5fa63b99fc94c78cbfb433d00
Parent: d6c69ee9a24b307ce94e55ebfba6208a830c9ecb
Author: Yaozu Dong <[EMAIL PROTECTED]>
AuthorDate: Wed Apr 25 16:49:19 2007 +0300
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Thu May 3 10:52:30 2007 +0300
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 <[EMAIL PROTECTED]>
---
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);
-
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