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    • Marc Zyngier's avatar
      arm64: KVM: Yield CPU when vcpu executes a WFE · d241aac7
      Marc Zyngier authored
      
      
      On an (even slightly) oversubscribed system, spinlocks are quickly
      becoming a bottleneck, as some vcpus are spinning, waiting for a
      lock to be released, while the vcpu holding the lock may not be
      running at all.
      
      The solution is to trap blocking WFEs and tell KVM that we're
      now spinning. This ensures that other vpus will get a scheduling
      boost, allowing the lock to be released more quickly. Also, using
      CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT slightly improves the performance
      when the VM is severely overcommited.
      Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
      Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
      d241aac7
  9. 07 Jun, 2013 1 commit