diff --git a/src/hotspot/share/gc/parallel/psPromotionManager.cpp b/src/hotspot/share/gc/parallel/psPromotionManager.cpp index 55db6bbbc6d..20ee8ec1f2a 100644 --- a/src/hotspot/share/gc/parallel/psPromotionManager.cpp +++ b/src/hotspot/share/gc/parallel/psPromotionManager.cpp @@ -237,9 +237,14 @@ void PSPromotionManager::drain_stacks_depth(bool totally_drain) { // Drain overflow stack first, so other threads can steal from // claimed stack while we work. while (tq->pop_overflow(task)) { - if (!tq->try_push_to_taskqueue(task)) { - process_popped_location_depth(task); - } + // In PSCardTable::scavenge_contents_parallel(), when work is distributed + // among different workers, an object is never split between multiple workers. + // Therefore, if a worker gets owned a large objArray, it may accumulate + // many tasks (corresponding to every element in this array) in its + // task queue. When there are too many overflow tasks, publishing them + // (via try_push_to_taskqueue()) can incur noticeable overhead in Young GC + // pause, so it is better to process them locally until large-objArray-splitting is implemented. + process_popped_location_depth(task); } while (tq->pop_local(task, threshold)) {