[google-cloud-sql-discuss] Differentiate between 2 parameters Total memory usage and Memory usage?

I am using CloudSQL with MySQL 5.7

This is my configuration

• vCPUs: 1
• Memory: 614.4 MB
• SSD storage: 10 GB

Lately my application has been running pretty slow, and I'm guessing it's due to a bottleneck in MySQL.

But when I look at the following 2 parameters, I don't understand why Total memory usage is smaller than Memory usage.??? (Attachment)

 

As references, we known:

• Total memory usage: Total RAM usage in bytes including buffer cache. Sampled every 60 seconds. After sampling, data is not visible for up to 210 seconds.
• Memory usage: RAM usage in bytes. Sampled every 60 seconds. After sampling, data is not visible for up to 210 seconds.

Can anyone help me explain in more detail about these 2 metrics?

Thanks very much

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