code: func ReleaseBuffer(b []byte) {
  	log.Debugf("Releasing buffer! (cap,size = %d, %d)", cap(b), len(b))
  	mpool.ByteSlicePool.Put(uint32(cap(b)), b)
  }
docs: // ReleaseBuffer puts the given byte array back into the appropriate
  // global buffer pool based on its capacity.