Hi Marc, On 2019/11/8 0:04, Marc Zyngier wrote:
Just like we do for WFE trapping, it can be useful to turn off WFI trapping when the physical CPU is not oversubscribed (that is, the vcpu is the only runnable process on this CPU) *and* that we're using direct injection of interrupts. The conditions are reevaluated on each vcpu_load(), ensuring that we don't switch to this mode on a busy system. On a GICv4 system, this has the effect of reducing the generation of doorbell interrupts to zero when the right conditions are met, which is a huge improvement over the current situation (where the doorbells are screaming if the CPU ever hits a blocking WFI). Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reviewed-by: Zenghui Yu <yuzenghui@xxxxxxxxxx> _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
