void HeapRegionManager::make_regions_available(uint start, uint num_regions) {
guarantee(num_regions > 0, "No point in calling this for zero regions");
commit_regions(start, num_regions);
for (uint i = start; i < start + num_regions; i++) {
if (_regions.get_by_index(i) == NULL) {
HeapRegion* new_hr = new_heap_region(i);
_regions.set_by_index(i, new_hr);
_allocated_heapregions_length = MAX2(_allocated_heapregions_length, i + 1);
}
}
_available_map.par_set_range(start, start + num_regions, BitMap::unknown_range);
for (uint i = start; i < start + num_regions; i++) {
assert(is_available(i), "Just made region %u available but is apparently not.", i);
HeapRegion* hr = at(i);
if (G1CollectedHeap::heap()->hr_printer()->is_active()) {
G1CollectedHeap::heap()->hr_printer()->commit(hr);
}
HeapWord* bottom = G1CollectedHeap::heap()->bottom_addr_for_region(i);
MemRegion mr(bottom, bottom + HeapRegion::GrainWords);
hr->initialize(mr);
insert_into_free_list(at(i));
}
}
// Return the "dummy" region used for G1AllocRegion. This is currently a hardwired
// new HeapRegion that owns HeapRegion at index 0. Since at the moment we commit
// the heap from the lowest address, this region (and its associated data
// structures) are available and we do not need to check further.
HeapRegion* get_dummy_region() { return new_heap_region(0); }
