diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c index 4d84b5fb8a..5700763ccd 100644 --- a/xen/common/sched_credit.c +++ b/xen/common/sched_credit.c @@ -1802,9 +1802,16 @@ csched_schedule( * cpu and steal it. */ - /* If we have schedule rate limiting enabled, check to see - * how long we've run for. */ - if ( !tasklet_work_scheduled + /* + * If we have schedule rate limiting enabled, check to see + * how long we've run for. + * + * If scurr is yielding, however, we don't let rate limiting kick in. + * In fact, it may be the case that scurr is about to spin, and there's + * no point forcing it to do so until rate limiting expires. + */ + if ( !test_bit(CSCHED_FLAG_VCPU_YIELD, &scurr->flags) + && !tasklet_work_scheduled && prv->ratelimit_us && vcpu_runnable(current) && !is_idle_vcpu(current)