>> That said, it seems Jason's numbers are including mmapped files, so
>> it's not clear exactly what's going on.
> Yes the previous numbers did include mmap and I hadn't realized it
> was important to exclude mmap'd data.
I'm not so sure about that. The only difference between file-backed
and anonymous data is that that the former can be discarded straight
away, while the latter needs to be written to swap before it can be
discarded. It doesn't do as much as you'd expect to decrease memory
pressure.
Juliusz
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