code: public static void clear() {
  		for (int i = 0; i < ByteBufPool.NUMBER_OF_SLABS; i++) {
  			slabs[i].clear();
  			created[i].set(0);
  			reused[i].set(0);
  		}
  		synchronized (registry) {
  			registry.clear();
  		}
  	}
docs: Clears all of the slabs and stats.