double G1MMUTrackerQueue::calculate_gc_time(double current_time) {
double gc_time = 0.0;
double limit = current_time - _time_slice;
for (int i = 0; i < _no_entries; ++i) {
int index = trim_index(_tail_index + i);
G1MMUTrackerQueueElem *elem = &_array[index];
if (elem->end_time() > limit) {
if (elem->start_time() > limit)
gc_time += elem->duration();
else
gc_time += elem->end_time() - limit;
}
}
return gc_time;
}
double G1MMUTrackerQueue::when_internal(double current_time,
double pause_time) {
// if the pause is over the maximum, just assume that it's the maximum
double adjusted_pause_time =
(pause_time > max_gc_time()) ? max_gc_time() : pause_time;
double earliest_end = current_time + adjusted_pause_time;
double limit = earliest_end - _time_slice;
double gc_time = calculate_gc_time(earliest_end);
double diff = gc_time + adjusted_pause_time - max_gc_time();
if (is_double_leq_0(diff))
return 0.0;
int index = _tail_index;
while ( 1 ) {
G1MMUTrackerQueueElem *elem = &_array[index];
if (elem->end_time() > limit) {
if (elem->start_time() > limit)
diff -= elem->duration();
else
diff -= elem->end_time() - limit;
if (is_double_leq_0(diff))
return elem->end_time() + diff + _time_slice - adjusted_pause_time - current_time;
}
index = trim_index(index+1);
guarantee(index != trim_index(_head_index + 1), "should not go past head");
}
}
