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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>
This commit is contained in:
Raghavendra K T 2013-03-04 23:32:27 +05:30 committed by Gleb Natapov
parent 3a08a8f9f0
commit 7bc7ae25b1
1 changed files with 2 additions and 0 deletions
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2
virt/kvm/kvm_main.c
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@ -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))