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authorRaghavendra K T <raghavendra.kt@linux.vnet.ibm.com>2013-03-04 23:32:27 +0530
committerGleb Natapov <gleb@redhat.com>2013-03-11 11:37:22 +0200
commit7bc7ae25b1438bb9fe1f176b951d758789847640 (patch)
tree47d7e933d79152b9272b101e68bd0ad43c4ec918 /virt
parent3a08a8f9f0936e182d387afd85fdc5d303381521 (diff)
downloadlinux-linaro-stable-7bc7ae25b1438bb9fe1f176b951d758789847640.tar.gz
kvm: Iterate over only vcpus that are preempted
This helps in filtering out the eligible candidates further and thus potentially helps in quickly allowing preempted lockholders to run. Note that if a vcpu was spinning during preemption we filter them by checking whether they are preempted due to pause loop exit. Reviewed-by: Chegu Vinod <chegu_vinod@hp.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 470f2bc8205a..ff7154188b5f 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1768,6 +1768,8 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
continue;
} else if (pass && i > last_boosted_vcpu)
break;
+ if (!ACCESS_ONCE(vcpu->preempted))
+ continue;
if (vcpu == me)
continue;
if (waitqueue_active(&vcpu->wq))