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Amazon RDS has a metric for 'freeable memory'. It appears to go down in a sawtooth pattern:

https://skitch.com/adamnelson/rnhpu/aws-management-console

This leads me to believe that it's memory that is being used by MySQL for caching and that when the cache expires, more freeable memory appears. Any definitive documentation would be great.

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Hey Adam, I scoured Google and Yahoo. Nobody has posted any AWS Management Console input anywhere. I also see that you posted this question in many forums in the past. I hope you find you answer someday soon. – RolandoMySQLDBA Mar 3 '11 at 21:25

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It includes cached memory and memory used for buffers (besides what's really free/unused). They'll all be freed if an application requests more memory than what's free.

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