[Devel] memrlimit controller merge to mainline

[Paul Menage]

Hi Balbir,

Andrew included the memrlimit controller in his latest set of patches
to Linus for mainline.

Although the memrlimit controller basically works as intended, my
impression from the mini-summit on Tuesday is that our consensus is
that this still doesn't have concrete practical use-cases yet:

- avoiding swap over-use is better handled by the forthcoming swap controller

- applications that can usefully handle mmap() returning NULL don't
really exist yet (and since the system as a whole allows address space
overcommit limits, if it was practical/useful to write such apps then
presumably they would already exist)

So I think we'd be complicating some of the vm paths in mainline with
a feature that isn't likely to get a lot of real use.

What do you (and others on the containers list) think? Should we ask
Andrew/Linus to hold off on this for now? My preference would be to do
that until we have someone who can stand up with a concrete scenario
where they want to use this in a real environment.

Paul
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