void MemoryTracker::alloc(Int64 size)
{
……
    if (auto * loaded_next = parent.load(std::memory_order_relaxed))
        loaded_next->alloc(size);
  
//-------------------------------
void MemoryTracker::free(Int64 size)
{
……
    if (auto * loaded_next = parent.load(std::memory_order_relaxed))
        loaded_next->free(size);