I need to understand Linux memory performance. What defines an unhealthy Linux OS as far as memory utilization, paging, amount in paging versus amount in RAM, etc.? There are so many different commands and ways to interpret this, so I wanted to get your viewpoint. Note that my focus in the past thousand years or so of my career have been on programming, and I only took this operations job as a way to keep working after my web dev job was outsourced to another country. That's why I need your help.