From: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx> When PLE handler fails to find a better candidate to yield_to, it goes back and does spin again. This is acceptable when we do not have overcommit. But in overcommitted scenarios (especially when we have large number of small guests), it is better to yield. Reviewed-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx> --- virt/kvm/kvm_main.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 8323685..713b677 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1660,6 +1660,10 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me) } } } + /* In overcommitted cases, yield instead of spinning */ + if (!yielded && rq_nr_running() > 1) + schedule(); + kvm_vcpu_set_in_spin_loop(me, false); /* Ensure vcpu is not eligible during next spinloop */ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
