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.
Also Youtube talks are available
，这一点在体育直播中也有详细论述
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