uint HeapRegionManager::find_highest_free(bool* expanded) {
// Loop downwards from the highest region index, looking for an
// entry which is either free or not yet committed. If not yet
// committed, expand_at that index.
uint curr = max_length() - 1;
while (true) {
HeapRegion *hr = _regions.get_by_index(curr);
if (hr == NULL) {
uint res = expand_at(curr, 1);
if (res == 1) {
*expanded = true;
return curr;
}
} else {
if (hr->is_free()) {
*expanded = false;
return curr;
}
}
if (curr == 0) {
return G1_NO_HRM_INDEX;
}
curr--;
}
}
bool HeapRegionManager::allocate_containing_regions(MemRegion range, size_t* commit_count) {
size_t commits = 0;
uint start_index = (uint)_regions.get_index_by_address(range.start());
uint last_index = (uint)_regions.get_index_by_address(range.last());
// Ensure that each G1 region in the range is free, returning false if not.
// Commit those that are not yet available, and keep count.
for (uint curr_index = start_index; curr_index <= last_index; curr_index++) {
if (!is_available(curr_index)) {
commits++;
expand_at(curr_index, 1);
}
HeapRegion* curr_region = _regions.get_by_index(curr_index);
if (!curr_region->is_free()) {
return false;
}
}
allocate_free_regions_starting_at(start_index, (last_index - start_index) + 1);
*commit_count = commits;
return true;
}
uint HeapRegionManager::expand_by(uint num_regions) {
return expand_at(0, num_regions);
}
uint HeapRegionManager::expand_by(uint num_regions, WorkGang* pretouch_workers) {
return expand_at(0, num_regions, pretouch_workers);
}
