presto-main/src/main/java/io/prestosql/execution/resourcegroups/InternalResourceGroup.java/RootInternalResourceGroup/generateCpuQuota
class RootInternalResourceGroup:        public synchronized void generateCpuQuota(long elapsedSeconds)
        {
            if (elapsedSeconds > 0) {
                internalGenerateCpuQuota(elapsedSeconds);
            }
        }