diff options
| -rw-r--r-- | kernel/sched_fair.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index d7fda41ddaf0..cc97ea498f24 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1262,7 +1262,17 @@ wake_affine(struct sched_domain *this_sd, struct rq *this_rq, tg = task_group(p); weight = p->se.load.weight; - balanced = 100*(tl + effective_load(tg, this_cpu, weight, weight)) <= + /* + * In low-load situations, where prev_cpu is idle and this_cpu is idle + * due to the sync cause above having dropped tl to 0, we'll always have + * an imbalance, but there's really nothing you can do about that, so + * that's good too. + * + * Otherwise check if either cpus are near enough in load to allow this + * task to be woken on this_cpu. + */ + balanced = !tl || + 100*(tl + effective_load(tg, this_cpu, weight, weight)) <= imbalance*(load + effective_load(tg, prev_cpu, 0, weight)); /* |