void ConcurrentG1Refine::reset_threshold_step() {
if (FLAG_IS_DEFAULT(G1ConcRefinementThresholdStep)) {
_thread_threshold_step = (yellow_zone() - green_zone()) / (worker_thread_num() + 1);
} else {
_thread_threshold_step = G1ConcRefinementThresholdStep;
}
}
void ConcurrentG1Refine::adjust(double update_rs_time,
size_t update_rs_processed_buffers,
double goal_ms) {
DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
if (G1UseAdaptiveConcRefinement) {
update_zones(update_rs_time, update_rs_processed_buffers, goal_ms);
update_thread_thresholds();
// Change the barrier params
if (_n_worker_threads == 0) {
// Disable dcqs notification when there are no threads to notify.
dcqs.set_process_completed_threshold(INT_MAX);
} else {
// Worker 0 is the primary; wakeup is via dcqs notification.
STATIC_ASSERT(max_yellow_zone <= INT_MAX);
size_t activate = _threads[0]->activation_threshold();
dcqs.set_process_completed_threshold((int)activate);
}
dcqs.set_max_completed_queue((int)red_zone());
}
size_t curr_queue_size = dcqs.completed_buffers_num();
if (curr_queue_size >= yellow_zone()) {
dcqs.set_completed_queue_padding(curr_queue_size);
} else {
dcqs.set_completed_queue_padding(0);
}
dcqs.notify_if_necessary();
}
ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure) :
_threads(NULL), _n_threads(0),
_hot_card_cache(g1h)
{
// Ergomonically select initial concurrent refinement parameters
if (FLAG_IS_DEFAULT(G1ConcRefinementGreenZone)) {
FLAG_SET_DEFAULT(G1ConcRefinementGreenZone, MAX2<int>(ParallelGCThreads, 1));
}
set_green_zone(G1ConcRefinementGreenZone);
if (FLAG_IS_DEFAULT(G1ConcRefinementYellowZone)) {
FLAG_SET_DEFAULT(G1ConcRefinementYellowZone, green_zone() * 3);
}
set_yellow_zone(MAX2<int>(G1ConcRefinementYellowZone, green_zone()));
if (FLAG_IS_DEFAULT(G1ConcRefinementRedZone)) {
FLAG_SET_DEFAULT(G1ConcRefinementRedZone, yellow_zone() * 2);
}
set_red_zone(MAX2<int>(G1ConcRefinementRedZone, yellow_zone()));
_n_worker_threads = thread_num();
// We need one extra thread to do the young gen rset size sampling.
_n_threads = _n_worker_threads + 1;
reset_threshold_step();
_threads = NEW_C_HEAP_ARRAY(ConcurrentG1RefineThread*, _n_threads, mtGC);
uint worker_id_offset = DirtyCardQueueSet::num_par_ids();
ConcurrentG1RefineThread *next = NULL;
for (uint i = _n_threads - 1; i != UINT_MAX; i--) {
ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, refine_closure, worker_id_offset, i);
assert(t != NULL, "Conc refine should have been created");
if (t->osthread() == NULL) {
vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
}
assert(t->cg1r() == this, "Conc refine thread should refer to this");
_threads[i] = t;
next = t;
}
}
