# Inject at runtime, never store on disk
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文丨医线Insight，作者 | 张小漫，这一点在下载安装汽水音乐中也有详细论述
The ALLOC function does the heavy lifting, but that is inevitable: Only by walking the entire MCB chain can DOS coalesce all eligible memory and ensure that the largest free block is found. This means that calling the ALLOC function can be somewhat expensive if the MCB chain is long. In practice, there are unlikely to be more than a few dozen MCBs, even in a heavily loaded system.，这一点在Line官方版本下载中也有详细论述