diff options
Diffstat (limited to 'kernel/sched/rt.c')
| -rw-r--r-- | kernel/sched/rt.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index c03d51a017bf..ee095f4e7230 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1823,6 +1823,7 @@ static int find_lowest_rq_hmp(struct task_struct *task) * the best one based on our affinity and topology. */ +retry: for_each_sched_cluster(cluster) { if (boost_on_big && cluster->capacity != max_possible_capacity) continue; @@ -1830,6 +1831,15 @@ static int find_lowest_rq_hmp(struct task_struct *task) cpumask_and(&candidate_mask, &cluster->cpus, lowest_mask); cpumask_andnot(&candidate_mask, &candidate_mask, cpu_isolated_mask); + /* + * When placement boost is active, if there is no eligible CPU + * in the highest capacity cluster, we fallback to the other + * clusters. So clear the CPUs of the traversed cluster from + * the lowest_mask. + */ + if (unlikely(boost_on_big)) + cpumask_andnot(lowest_mask, lowest_mask, + &cluster->cpus); if (cpumask_empty(&candidate_mask)) continue; @@ -1869,6 +1879,11 @@ static int find_lowest_rq_hmp(struct task_struct *task) break; } + if (unlikely(boost_on_big && best_cpu == -1)) { + boost_on_big = 0; + goto retry; + } + return best_cpu; } #endif /* CONFIG_SCHED_HMP */ |