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KVM: use yield_to instead of sleep in kvm_vcpu_on_spin

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Instead of sleeping in kvm_vcpu_on_spin, which can cause gigantic
slowdowns of certain workloads, we instead use yield_to to get
another VCPU in the same KVM guest to run sooner.

This seems to give a 10-15% speedup in certain workloads.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Rik van Riel 2011-02-01 09:53:28 -05:00 • committed by Marcelo Tosatti
parent 34bb10b79d
commit 217ece6129
2 changed files with 48 additions and 10 deletions
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1
include/linux/kvm_host.h
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@ -235,6 +235,7 @@ struct kvm {
#endif
struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
atomic_t online_vcpus;
int last_boosted_vcpu;
struct list_head vm_list;
struct mutex lock;
struct kvm_io_bus *buses[KVM_NR_BUSES];