presto-memory-context/src/main/java/io/prestosql/memory/context/ChildAggregatedMemoryContext.java/ChildAggregatedMemoryContext/tryUpdateBytes
class ChildAggregatedMemoryContext:    @Override
    synchronized boolean tryUpdateBytes(String allocationTag, long delta)
    {
        if (parentMemoryContext.tryUpdateBytes(allocationTag, delta)) {
            addBytes(delta);
            return true;
        }
        return false;
    }