void PSOldGen::resize(size_t desired_free_space) {
ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
const size_t alignment = heap->min_alignment();
const size_t size_before = _virtual_space.committed_size();
size_t new_size = used_in_bytes() + desired_free_space;
new_size = align_size_up(new_size, alignment);
assert(_max_gen_size == reserved().byte_size(), "max new size problem?");
// Adjust according to our min and max
new_size = MAX2(MIN2(new_size, _max_gen_size), _min_gen_size);
const size_t current_size = capacity_in_bytes();
if (new_size == current_size) {
// No change requested
return;
}
if (new_size > current_size) {
size_t change_bytes = new_size - current_size;
expand(change_bytes);
} else {
size_t change_bytes = current_size - new_size;
// shrink doesn't grab this lock, expand does. Is that right?
MutexLocker x(ExpandHeap_lock);
shrink(change_bytes);
}
if (PrintAdaptiveSizePolicy) {
gclog_or_tty->print_cr("AdaptiveSizePolicy::old generation size: "
"collection: %d "
"(" SIZE_FORMAT ") -> (" SIZE_FORMAT ") ",
heap->total_collections(),
size_before, _virtual_space.committed_size());
}
}
