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| author | Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> | 2013-03-04 23:32:27 +0530 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-03-11 11:37:22 +0200 |
| commit | 7bc7ae25b1438bb9fe1f176b951d758789847640 (patch) | |
| tree | 47d7e933d79152b9272b101e68bd0ad43c4ec918 /virt | |
| parent | 3a08a8f9f0936e182d387afd85fdc5d303381521 (diff) | |
| download | lwn-7bc7ae25b1438bb9fe1f176b951d758789847640.tar.gz lwn-7bc7ae25b1438bb9fe1f176b951d758789847640.zip | |
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.c | 2 |
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)) |