网上搜了以下，总体是这个意思：vm+swap只能把value swap到文件中，如果单独key就超过了vm-max-memory，那么就swap不出去了。对话如下：
Q1
What might be the cause of this error:

vm-max-memory limit exceeded by more than 10% but unable to swap more

objects out!

thank you
A1
Redis is only ab[......]

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