linux - Why is mongod not using all available RAM?

We have an mongod instance runnning on a VM, and it doesn't seem to be using all available memory. It's page-faulting significantly more than usual, and the system's performance has been significantly degraded lately.

More specifically, if I htop mongod, I see:

VIRT: 3471G

RES: 11.8G

The VM has ~60 GB of memory, currently, ~4.6GB is "used", and the remainder is in buffers or cache.

My understanding is that mongod mmaps the database files. (This is why VIRT is huge.) However, we're not clear on why the RES number isn't closer to 60 GB: as mongod needs data off disk, this data should be brought into the processes RSS, no? Mongo reports that it is page-faulting, so one would assume that the RSS would grow over time; ours is holding steady.

There is nothing else significant running on this machine. (It's the database server.) What's consuming the rest of buffers and cache, and specifically, why is the RES size of mongod not expanding to fill available RAM?

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