A question about virtual memory.

[Owen Thomas]

Thanks Liam, Ralf, for the responses. Please excuse the length of time it
took to write a follow-up; I went to bed shortly after posting my question,
and have only now been able to respond.

I guess an LRU or variant thereof is being used for memory management so
that once virtual memory begins to be used, it never goes back to zero.
Perhaps some operating system utility grabs memory for some purpose and
never lets it go, or possibly an application is leaking memory that is
eventually being exported to disk.

Hmmm...
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