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Flawed analogy: you use up the gas and your car stops. You use up memory and … the kernel swaps pages around. Now, if the kernel isn't giving you back memory, that's a problem, but the OP doesn't actually show that this is happening.



No, it captures what I want to worry about. I do not want to be in the situation where processes that I am interacting with in real time are paging stuff out to disk. This is really bad for my user experience.

So if my memory is "full" with a bunch of just-in-case stuff, I'll gladly swap it out for real data that a real running process is using it. But if it's "full" of data in use for running processes, then I want to think twice about opening a new application. And I want my memory manager to tell me the difference between those two "full" cases.




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